1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2014 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
24 #include "nat/linux-nat.h"
25 #include "nat/linux-waitpid.h"
27 #include <sys/ptrace.h>
28 #include "nat/linux-ptrace.h"
29 #include "nat/linux-procfs.h"
31 #include <sys/ioctl.h>
34 #include <sys/syscall.h>
38 #include <sys/types.h>
43 #include "filestuff.h"
44 #include "tracepoint.h"
47 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
48 then ELFMAG0 will have been defined. If it didn't get included by
49 gdb_proc_service.h then including it will likely introduce a duplicate
50 definition of elf_fpregset_t. */
55 #define SPUFS_MAGIC 0x23c9b64e
58 #ifdef HAVE_PERSONALITY
59 # include <sys/personality.h>
60 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
61 # define ADDR_NO_RANDOMIZE 0x0040000
70 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
73 /* This is the kernel's hard limit. Not to be confused with
79 /* Some targets did not define these ptrace constants from the start,
80 so gdbserver defines them locally here. In the future, these may
81 be removed after they are added to asm/ptrace.h. */
82 #if !(defined(PT_TEXT_ADDR) \
83 || defined(PT_DATA_ADDR) \
84 || defined(PT_TEXT_END_ADDR))
85 #if defined(__mcoldfire__)
86 /* These are still undefined in 3.10 kernels. */
87 #define PT_TEXT_ADDR 49*4
88 #define PT_DATA_ADDR 50*4
89 #define PT_TEXT_END_ADDR 51*4
90 /* BFIN already defines these since at least 2.6.32 kernels. */
92 #define PT_TEXT_ADDR 220
93 #define PT_TEXT_END_ADDR 224
94 #define PT_DATA_ADDR 228
95 /* These are still undefined in 3.10 kernels. */
96 #elif defined(__TMS320C6X__)
97 #define PT_TEXT_ADDR (0x10000*4)
98 #define PT_DATA_ADDR (0x10004*4)
99 #define PT_TEXT_END_ADDR (0x10008*4)
103 #ifdef HAVE_LINUX_BTRACE
104 # include "nat/linux-btrace.h"
107 #ifndef HAVE_ELF32_AUXV_T
108 /* Copied from glibc's elf.h. */
111 uint32_t a_type
; /* Entry type */
114 uint32_t a_val
; /* Integer value */
115 /* We use to have pointer elements added here. We cannot do that,
116 though, since it does not work when using 32-bit definitions
117 on 64-bit platforms and vice versa. */
122 #ifndef HAVE_ELF64_AUXV_T
123 /* Copied from glibc's elf.h. */
126 uint64_t a_type
; /* Entry type */
129 uint64_t a_val
; /* Integer value */
130 /* We use to have pointer elements added here. We cannot do that,
131 though, since it does not work when using 32-bit definitions
132 on 64-bit platforms and vice versa. */
137 /* A list of all unknown processes which receive stop signals. Some
138 other process will presumably claim each of these as forked
139 children momentarily. */
141 struct simple_pid_list
143 /* The process ID. */
146 /* The status as reported by waitpid. */
150 struct simple_pid_list
*next
;
152 struct simple_pid_list
*stopped_pids
;
154 /* Trivial list manipulation functions to keep track of a list of new
155 stopped processes. */
158 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
160 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
163 new_pid
->status
= status
;
164 new_pid
->next
= *listp
;
169 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
171 struct simple_pid_list
**p
;
173 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
174 if ((*p
)->pid
== pid
)
176 struct simple_pid_list
*next
= (*p
)->next
;
178 *statusp
= (*p
)->status
;
186 enum stopping_threads_kind
188 /* Not stopping threads presently. */
189 NOT_STOPPING_THREADS
,
191 /* Stopping threads. */
194 /* Stopping and suspending threads. */
195 STOPPING_AND_SUSPENDING_THREADS
198 /* This is set while stop_all_lwps is in effect. */
199 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
201 /* FIXME make into a target method? */
202 int using_threads
= 1;
204 /* True if we're presently stabilizing threads (moving them out of
206 static int stabilizing_threads
;
208 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
209 int step
, int signal
, siginfo_t
*info
);
210 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
211 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
212 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
213 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
214 int *wstat
, int options
);
215 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
216 static struct lwp_info
*add_lwp (ptid_t ptid
);
217 static int linux_stopped_by_watchpoint (void);
218 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
219 static void proceed_all_lwps (void);
220 static int finish_step_over (struct lwp_info
*lwp
);
221 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
222 static int kill_lwp (unsigned long lwpid
, int signo
);
224 /* True if the low target can hardware single-step. Such targets
225 don't need a BREAKPOINT_REINSERT_ADDR callback. */
228 can_hardware_single_step (void)
230 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
233 /* True if the low target supports memory breakpoints. If so, we'll
234 have a GET_PC implementation. */
237 supports_breakpoints (void)
239 return (the_low_target
.get_pc
!= NULL
);
242 /* Returns true if this target can support fast tracepoints. This
243 does not mean that the in-process agent has been loaded in the
247 supports_fast_tracepoints (void)
249 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
252 /* True if LWP is stopped in its stepping range. */
255 lwp_in_step_range (struct lwp_info
*lwp
)
257 CORE_ADDR pc
= lwp
->stop_pc
;
259 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
262 struct pending_signals
266 struct pending_signals
*prev
;
269 /* The read/write ends of the pipe registered as waitable file in the
271 static int linux_event_pipe
[2] = { -1, -1 };
273 /* True if we're currently in async mode. */
274 #define target_is_async_p() (linux_event_pipe[0] != -1)
276 static void send_sigstop (struct lwp_info
*lwp
);
277 static void wait_for_sigstop (void);
279 /* Return non-zero if HEADER is a 64-bit ELF file. */
282 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
284 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
285 && header
->e_ident
[EI_MAG1
] == ELFMAG1
286 && header
->e_ident
[EI_MAG2
] == ELFMAG2
287 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
289 *machine
= header
->e_machine
;
290 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
297 /* Return non-zero if FILE is a 64-bit ELF file,
298 zero if the file is not a 64-bit ELF file,
299 and -1 if the file is not accessible or doesn't exist. */
302 elf_64_file_p (const char *file
, unsigned int *machine
)
307 fd
= open (file
, O_RDONLY
);
311 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
318 return elf_64_header_p (&header
, machine
);
321 /* Accepts an integer PID; Returns true if the executable PID is
322 running is a 64-bit ELF file.. */
325 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
329 sprintf (file
, "/proc/%d/exe", pid
);
330 return elf_64_file_p (file
, machine
);
334 delete_lwp (struct lwp_info
*lwp
)
336 struct thread_info
*thr
= get_lwp_thread (lwp
);
339 debug_printf ("deleting %ld\n", lwpid_of (thr
));
342 free (lwp
->arch_private
);
346 /* Add a process to the common process list, and set its private
349 static struct process_info
*
350 linux_add_process (int pid
, int attached
)
352 struct process_info
*proc
;
354 proc
= add_process (pid
, attached
);
355 proc
->private = xcalloc (1, sizeof (*proc
->private));
357 /* Set the arch when the first LWP stops. */
358 proc
->private->new_inferior
= 1;
360 if (the_low_target
.new_process
!= NULL
)
361 proc
->private->arch_private
= the_low_target
.new_process ();
366 /* Handle a GNU/Linux extended wait response. If we see a clone
367 event, we need to add the new LWP to our list (and not report the
368 trap to higher layers). */
371 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
373 int event
= wstat
>> 16;
374 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
375 struct lwp_info
*new_lwp
;
377 if (event
== PTRACE_EVENT_CLONE
)
380 unsigned long new_pid
;
383 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
386 /* If we haven't already seen the new PID stop, wait for it now. */
387 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
389 /* The new child has a pending SIGSTOP. We can't affect it until it
390 hits the SIGSTOP, but we're already attached. */
392 ret
= my_waitpid (new_pid
, &status
, __WALL
);
395 perror_with_name ("waiting for new child");
396 else if (ret
!= new_pid
)
397 warning ("wait returned unexpected PID %d", ret
);
398 else if (!WIFSTOPPED (status
))
399 warning ("wait returned unexpected status 0x%x", status
);
403 debug_printf ("HEW: Got clone event "
404 "from LWP %ld, new child is LWP %ld\n",
405 lwpid_of (event_thr
), new_pid
);
407 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
408 new_lwp
= add_lwp (ptid
);
410 /* Either we're going to immediately resume the new thread
411 or leave it stopped. linux_resume_one_lwp is a nop if it
412 thinks the thread is currently running, so set this first
413 before calling linux_resume_one_lwp. */
414 new_lwp
->stopped
= 1;
416 /* If we're suspending all threads, leave this one suspended
418 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
419 new_lwp
->suspended
= 1;
421 /* Normally we will get the pending SIGSTOP. But in some cases
422 we might get another signal delivered to the group first.
423 If we do get another signal, be sure not to lose it. */
424 if (WSTOPSIG (status
) == SIGSTOP
)
426 if (stopping_threads
!= NOT_STOPPING_THREADS
)
427 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
429 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
433 new_lwp
->stop_expected
= 1;
435 if (stopping_threads
!= NOT_STOPPING_THREADS
)
437 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
438 new_lwp
->status_pending_p
= 1;
439 new_lwp
->status_pending
= status
;
442 /* Pass the signal on. This is what GDB does - except
443 shouldn't we really report it instead? */
444 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
447 /* Always resume the current thread. If we are stopping
448 threads, it will have a pending SIGSTOP; we may as well
450 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
454 /* Return the PC as read from the regcache of LWP, without any
458 get_pc (struct lwp_info
*lwp
)
460 struct thread_info
*saved_inferior
;
461 struct regcache
*regcache
;
464 if (the_low_target
.get_pc
== NULL
)
467 saved_inferior
= current_inferior
;
468 current_inferior
= get_lwp_thread (lwp
);
470 regcache
= get_thread_regcache (current_inferior
, 1);
471 pc
= (*the_low_target
.get_pc
) (regcache
);
474 debug_printf ("pc is 0x%lx\n", (long) pc
);
476 current_inferior
= saved_inferior
;
480 /* This function should only be called if LWP got a SIGTRAP.
481 The SIGTRAP could mean several things.
483 On i386, where decr_pc_after_break is non-zero:
484 If we were single-stepping this process using PTRACE_SINGLESTEP,
485 we will get only the one SIGTRAP (even if the instruction we
486 stepped over was a breakpoint). The value of $eip will be the
488 If we continue the process using PTRACE_CONT, we will get a
489 SIGTRAP when we hit a breakpoint. The value of $eip will be
490 the instruction after the breakpoint (i.e. needs to be
491 decremented). If we report the SIGTRAP to GDB, we must also
492 report the undecremented PC. If we cancel the SIGTRAP, we
493 must resume at the decremented PC.
495 (Presumably, not yet tested) On a non-decr_pc_after_break machine
496 with hardware or kernel single-step:
497 If we single-step over a breakpoint instruction, our PC will
498 point at the following instruction. If we continue and hit a
499 breakpoint instruction, our PC will point at the breakpoint
503 get_stop_pc (struct lwp_info
*lwp
)
507 if (the_low_target
.get_pc
== NULL
)
510 stop_pc
= get_pc (lwp
);
512 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
514 && !lwp
->stopped_by_watchpoint
515 && lwp
->last_status
>> 16 == 0)
516 stop_pc
-= the_low_target
.decr_pc_after_break
;
519 debug_printf ("stop pc is 0x%lx\n", (long) stop_pc
);
524 static struct lwp_info
*
525 add_lwp (ptid_t ptid
)
527 struct lwp_info
*lwp
;
529 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
530 memset (lwp
, 0, sizeof (*lwp
));
532 if (the_low_target
.new_thread
!= NULL
)
533 lwp
->arch_private
= the_low_target
.new_thread ();
535 lwp
->thread
= add_thread (ptid
, lwp
);
540 /* Start an inferior process and returns its pid.
541 ALLARGS is a vector of program-name and args. */
544 linux_create_inferior (char *program
, char **allargs
)
546 #ifdef HAVE_PERSONALITY
547 int personality_orig
= 0, personality_set
= 0;
549 struct lwp_info
*new_lwp
;
553 #ifdef HAVE_PERSONALITY
554 if (disable_randomization
)
557 personality_orig
= personality (0xffffffff);
558 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
561 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
563 if (errno
!= 0 || (personality_set
564 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
565 warning ("Error disabling address space randomization: %s",
570 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
576 perror_with_name ("fork");
581 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
583 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
584 signal (__SIGRTMIN
+ 1, SIG_DFL
);
589 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
590 stdout to stderr so that inferior i/o doesn't corrupt the connection.
591 Also, redirect stdin to /dev/null. */
592 if (remote_connection_is_stdio ())
595 open ("/dev/null", O_RDONLY
);
597 if (write (2, "stdin/stdout redirected\n",
598 sizeof ("stdin/stdout redirected\n") - 1) < 0)
600 /* Errors ignored. */;
604 execv (program
, allargs
);
606 execvp (program
, allargs
);
608 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
614 #ifdef HAVE_PERSONALITY
618 personality (personality_orig
);
620 warning ("Error restoring address space randomization: %s",
625 linux_add_process (pid
, 0);
627 ptid
= ptid_build (pid
, pid
, 0);
628 new_lwp
= add_lwp (ptid
);
629 new_lwp
->must_set_ptrace_flags
= 1;
635 linux_attach_fail_reason_string (ptid_t ptid
, int err
)
637 static char *reason_string
;
638 struct buffer buffer
;
640 long lwpid
= ptid_get_lwp (ptid
);
642 xfree (reason_string
);
644 buffer_init (&buffer
);
645 linux_ptrace_attach_fail_reason (lwpid
, &buffer
);
646 buffer_grow_str0 (&buffer
, "");
647 warnings
= buffer_finish (&buffer
);
648 if (warnings
[0] != '\0')
649 reason_string
= xstrprintf ("%s (%d), %s",
650 strerror (err
), err
, warnings
);
652 reason_string
= xstrprintf ("%s (%d)",
653 strerror (err
), err
);
655 return reason_string
;
658 /* Attach to an inferior process. */
661 linux_attach_lwp (ptid_t ptid
)
663 struct lwp_info
*new_lwp
;
664 int lwpid
= ptid_get_lwp (ptid
);
666 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
670 new_lwp
= add_lwp (ptid
);
672 /* We need to wait for SIGSTOP before being able to make the next
673 ptrace call on this LWP. */
674 new_lwp
->must_set_ptrace_flags
= 1;
676 if (linux_proc_pid_is_stopped (lwpid
))
679 debug_printf ("Attached to a stopped process\n");
681 /* The process is definitely stopped. It is in a job control
682 stop, unless the kernel predates the TASK_STOPPED /
683 TASK_TRACED distinction, in which case it might be in a
684 ptrace stop. Make sure it is in a ptrace stop; from there we
685 can kill it, signal it, et cetera.
687 First make sure there is a pending SIGSTOP. Since we are
688 already attached, the process can not transition from stopped
689 to running without a PTRACE_CONT; so we know this signal will
690 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
691 probably already in the queue (unless this kernel is old
692 enough to use TASK_STOPPED for ptrace stops); but since
693 SIGSTOP is not an RT signal, it can only be queued once. */
694 kill_lwp (lwpid
, SIGSTOP
);
696 /* Finally, resume the stopped process. This will deliver the
697 SIGSTOP (or a higher priority signal, just like normal
698 PTRACE_ATTACH), which we'll catch later on. */
699 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
702 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
705 There are several cases to consider here:
707 1) gdbserver has already attached to the process and is being notified
708 of a new thread that is being created.
709 In this case we should ignore that SIGSTOP and resume the
710 process. This is handled below by setting stop_expected = 1,
711 and the fact that add_thread sets last_resume_kind ==
714 2) This is the first thread (the process thread), and we're attaching
715 to it via attach_inferior.
716 In this case we want the process thread to stop.
717 This is handled by having linux_attach set last_resume_kind ==
718 resume_stop after we return.
720 If the pid we are attaching to is also the tgid, we attach to and
721 stop all the existing threads. Otherwise, we attach to pid and
722 ignore any other threads in the same group as this pid.
724 3) GDB is connecting to gdbserver and is requesting an enumeration of all
726 In this case we want the thread to stop.
727 FIXME: This case is currently not properly handled.
728 We should wait for the SIGSTOP but don't. Things work apparently
729 because enough time passes between when we ptrace (ATTACH) and when
730 gdb makes the next ptrace call on the thread.
732 On the other hand, if we are currently trying to stop all threads, we
733 should treat the new thread as if we had sent it a SIGSTOP. This works
734 because we are guaranteed that the add_lwp call above added us to the
735 end of the list, and so the new thread has not yet reached
736 wait_for_sigstop (but will). */
737 new_lwp
->stop_expected
= 1;
742 /* Attach to PID. If PID is the tgid, attach to it and all
746 linux_attach (unsigned long pid
)
748 ptid_t ptid
= ptid_build (pid
, pid
, 0);
751 /* Attach to PID. We will check for other threads
753 err
= linux_attach_lwp (ptid
);
755 error ("Cannot attach to process %ld: %s",
756 pid
, linux_attach_fail_reason_string (ptid
, err
));
758 linux_add_process (pid
, 1);
762 struct thread_info
*thread
;
764 /* Don't ignore the initial SIGSTOP if we just attached to this
765 process. It will be collected by wait shortly. */
766 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
767 thread
->last_resume_kind
= resume_stop
;
770 if (linux_proc_get_tgid (pid
) == pid
)
775 sprintf (pathname
, "/proc/%ld/task", pid
);
777 dir
= opendir (pathname
);
781 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
786 /* At this point we attached to the tgid. Scan the task for
788 int new_threads_found
;
791 while (iterations
< 2)
795 new_threads_found
= 0;
796 /* Add all the other threads. While we go through the
797 threads, new threads may be spawned. Cycle through
798 the list of threads until we have done two iterations without
799 finding new threads. */
800 while ((dp
= readdir (dir
)) != NULL
)
806 lwp
= strtoul (dp
->d_name
, NULL
, 10);
808 ptid
= ptid_build (pid
, lwp
, 0);
810 /* Is this a new thread? */
811 if (lwp
!= 0 && find_thread_ptid (ptid
) == NULL
)
816 debug_printf ("Found new lwp %ld\n", lwp
);
818 err
= linux_attach_lwp (ptid
);
820 warning ("Cannot attach to lwp %ld: %s",
822 linux_attach_fail_reason_string (ptid
, err
));
828 if (!new_threads_found
)
849 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
851 struct counter
*counter
= args
;
853 if (ptid_get_pid (entry
->id
) == counter
->pid
)
855 if (++counter
->count
> 1)
863 last_thread_of_process_p (int pid
)
865 struct counter counter
= { pid
, 0 };
867 return (find_inferior (&all_threads
,
868 second_thread_of_pid_p
, &counter
) == NULL
);
874 linux_kill_one_lwp (struct lwp_info
*lwp
)
876 struct thread_info
*thr
= get_lwp_thread (lwp
);
877 int pid
= lwpid_of (thr
);
879 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
880 there is no signal context, and ptrace(PTRACE_KILL) (or
881 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
882 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
883 alternative is to kill with SIGKILL. We only need one SIGKILL
884 per process, not one for each thread. But since we still support
885 linuxthreads, and we also support debugging programs using raw
886 clone without CLONE_THREAD, we send one for each thread. For
887 years, we used PTRACE_KILL only, so we're being a bit paranoid
888 about some old kernels where PTRACE_KILL might work better
889 (dubious if there are any such, but that's why it's paranoia), so
890 we try SIGKILL first, PTRACE_KILL second, and so we're fine
894 kill_lwp (pid
, SIGKILL
);
897 int save_errno
= errno
;
899 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
900 target_pid_to_str (ptid_of (thr
)),
901 save_errno
? strerror (save_errno
) : "OK");
905 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
908 int save_errno
= errno
;
910 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
911 target_pid_to_str (ptid_of (thr
)),
912 save_errno
? strerror (save_errno
) : "OK");
916 /* Kill LWP and wait for it to die. */
919 kill_wait_lwp (struct lwp_info
*lwp
)
921 struct thread_info
*thr
= get_lwp_thread (lwp
);
922 int pid
= ptid_get_pid (ptid_of (thr
));
923 int lwpid
= ptid_get_lwp (ptid_of (thr
));
928 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
932 linux_kill_one_lwp (lwp
);
934 /* Make sure it died. Notes:
936 - The loop is most likely unnecessary.
938 - We don't use linux_wait_for_event as that could delete lwps
939 while we're iterating over them. We're not interested in
940 any pending status at this point, only in making sure all
941 wait status on the kernel side are collected until the
944 - We don't use __WALL here as the __WALL emulation relies on
945 SIGCHLD, and killing a stopped process doesn't generate
946 one, nor an exit status.
948 res
= my_waitpid (lwpid
, &wstat
, 0);
949 if (res
== -1 && errno
== ECHILD
)
950 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
951 } while (res
> 0 && WIFSTOPPED (wstat
));
953 gdb_assert (res
> 0);
956 /* Callback for `find_inferior'. Kills an lwp of a given process,
957 except the leader. */
960 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
962 struct thread_info
*thread
= (struct thread_info
*) entry
;
963 struct lwp_info
*lwp
= get_thread_lwp (thread
);
964 int pid
= * (int *) args
;
966 if (ptid_get_pid (entry
->id
) != pid
)
969 /* We avoid killing the first thread here, because of a Linux kernel (at
970 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
971 the children get a chance to be reaped, it will remain a zombie
974 if (lwpid_of (thread
) == pid
)
977 debug_printf ("lkop: is last of process %s\n",
978 target_pid_to_str (entry
->id
));
989 struct process_info
*process
;
990 struct lwp_info
*lwp
;
992 process
= find_process_pid (pid
);
996 /* If we're killing a running inferior, make sure it is stopped
997 first, as PTRACE_KILL will not work otherwise. */
998 stop_all_lwps (0, NULL
);
1000 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1002 /* See the comment in linux_kill_one_lwp. We did not kill the first
1003 thread in the list, so do so now. */
1004 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1009 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1013 kill_wait_lwp (lwp
);
1015 the_target
->mourn (process
);
1017 /* Since we presently can only stop all lwps of all processes, we
1018 need to unstop lwps of other processes. */
1019 unstop_all_lwps (0, NULL
);
1023 /* Get pending signal of THREAD, for detaching purposes. This is the
1024 signal the thread last stopped for, which we need to deliver to the
1025 thread when detaching, otherwise, it'd be suppressed/lost. */
1028 get_detach_signal (struct thread_info
*thread
)
1030 enum gdb_signal signo
= GDB_SIGNAL_0
;
1032 struct lwp_info
*lp
= get_thread_lwp (thread
);
1034 if (lp
->status_pending_p
)
1035 status
= lp
->status_pending
;
1038 /* If the thread had been suspended by gdbserver, and it stopped
1039 cleanly, then it'll have stopped with SIGSTOP. But we don't
1040 want to deliver that SIGSTOP. */
1041 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1042 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1045 /* Otherwise, we may need to deliver the signal we
1047 status
= lp
->last_status
;
1050 if (!WIFSTOPPED (status
))
1053 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1054 target_pid_to_str (ptid_of (thread
)));
1058 /* Extended wait statuses aren't real SIGTRAPs. */
1059 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1062 debug_printf ("GPS: lwp %s had stopped with extended "
1063 "status: no pending signal\n",
1064 target_pid_to_str (ptid_of (thread
)));
1068 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1070 if (program_signals_p
&& !program_signals
[signo
])
1073 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1074 target_pid_to_str (ptid_of (thread
)),
1075 gdb_signal_to_string (signo
));
1078 else if (!program_signals_p
1079 /* If we have no way to know which signals GDB does not
1080 want to have passed to the program, assume
1081 SIGTRAP/SIGINT, which is GDB's default. */
1082 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1085 debug_printf ("GPS: lwp %s had signal %s, "
1086 "but we don't know if we should pass it. "
1087 "Default to not.\n",
1088 target_pid_to_str (ptid_of (thread
)),
1089 gdb_signal_to_string (signo
));
1095 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1096 target_pid_to_str (ptid_of (thread
)),
1097 gdb_signal_to_string (signo
));
1099 return WSTOPSIG (status
);
1104 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1106 struct thread_info
*thread
= (struct thread_info
*) entry
;
1107 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1108 int pid
= * (int *) args
;
1111 if (ptid_get_pid (entry
->id
) != pid
)
1114 /* If there is a pending SIGSTOP, get rid of it. */
1115 if (lwp
->stop_expected
)
1118 debug_printf ("Sending SIGCONT to %s\n",
1119 target_pid_to_str (ptid_of (thread
)));
1121 kill_lwp (lwpid_of (thread
), SIGCONT
);
1122 lwp
->stop_expected
= 0;
1125 /* Flush any pending changes to the process's registers. */
1126 regcache_invalidate_thread (thread
);
1128 /* Pass on any pending signal for this thread. */
1129 sig
= get_detach_signal (thread
);
1131 /* Finally, let it resume. */
1132 if (the_low_target
.prepare_to_resume
!= NULL
)
1133 the_low_target
.prepare_to_resume (lwp
);
1134 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1135 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1136 error (_("Can't detach %s: %s"),
1137 target_pid_to_str (ptid_of (thread
)),
1145 linux_detach (int pid
)
1147 struct process_info
*process
;
1149 process
= find_process_pid (pid
);
1150 if (process
== NULL
)
1153 /* Stop all threads before detaching. First, ptrace requires that
1154 the thread is stopped to sucessfully detach. Second, thread_db
1155 may need to uninstall thread event breakpoints from memory, which
1156 only works with a stopped process anyway. */
1157 stop_all_lwps (0, NULL
);
1159 #ifdef USE_THREAD_DB
1160 thread_db_detach (process
);
1163 /* Stabilize threads (move out of jump pads). */
1164 stabilize_threads ();
1166 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1168 the_target
->mourn (process
);
1170 /* Since we presently can only stop all lwps of all processes, we
1171 need to unstop lwps of other processes. */
1172 unstop_all_lwps (0, NULL
);
1176 /* Remove all LWPs that belong to process PROC from the lwp list. */
1179 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1181 struct thread_info
*thread
= (struct thread_info
*) entry
;
1182 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1183 struct process_info
*process
= proc
;
1185 if (pid_of (thread
) == pid_of (process
))
1192 linux_mourn (struct process_info
*process
)
1194 struct process_info_private
*priv
;
1196 #ifdef USE_THREAD_DB
1197 thread_db_mourn (process
);
1200 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1202 /* Freeing all private data. */
1203 priv
= process
->private;
1204 free (priv
->arch_private
);
1206 process
->private = NULL
;
1208 remove_process (process
);
1212 linux_join (int pid
)
1217 ret
= my_waitpid (pid
, &status
, 0);
1218 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1220 } while (ret
!= -1 || errno
!= ECHILD
);
1223 /* Return nonzero if the given thread is still alive. */
1225 linux_thread_alive (ptid_t ptid
)
1227 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1229 /* We assume we always know if a thread exits. If a whole process
1230 exited but we still haven't been able to report it to GDB, we'll
1231 hold on to the last lwp of the dead process. */
1238 /* Return 1 if this lwp has an interesting status pending. */
1240 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1242 struct thread_info
*thread
= (struct thread_info
*) entry
;
1243 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1244 ptid_t ptid
= * (ptid_t
*) arg
;
1246 /* Check if we're only interested in events from a specific process
1248 if (!ptid_equal (minus_one_ptid
, ptid
)
1249 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1252 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1253 report any status pending the LWP may have. */
1254 if (thread
->last_resume_kind
== resume_stop
1255 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1258 return lwp
->status_pending_p
;
1262 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1264 ptid_t ptid
= *(ptid_t
*) data
;
1267 if (ptid_get_lwp (ptid
) != 0)
1268 lwp
= ptid_get_lwp (ptid
);
1270 lwp
= ptid_get_pid (ptid
);
1272 if (ptid_get_lwp (entry
->id
) == lwp
)
1279 find_lwp_pid (ptid_t ptid
)
1281 struct inferior_list_entry
*thread
1282 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1287 return get_thread_lwp ((struct thread_info
*) thread
);
1290 /* Return the number of known LWPs in the tgid given by PID. */
1295 struct inferior_list_entry
*inf
, *tmp
;
1298 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1300 if (ptid_get_pid (inf
->id
) == pid
)
1307 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1308 their exits until all other threads in the group have exited. */
1311 check_zombie_leaders (void)
1313 struct process_info
*proc
, *tmp
;
1315 ALL_PROCESSES (proc
, tmp
)
1317 pid_t leader_pid
= pid_of (proc
);
1318 struct lwp_info
*leader_lp
;
1320 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1323 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1324 "num_lwps=%d, zombie=%d\n",
1325 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1326 linux_proc_pid_is_zombie (leader_pid
));
1328 if (leader_lp
!= NULL
1329 /* Check if there are other threads in the group, as we may
1330 have raced with the inferior simply exiting. */
1331 && !last_thread_of_process_p (leader_pid
)
1332 && linux_proc_pid_is_zombie (leader_pid
))
1334 /* A leader zombie can mean one of two things:
1336 - It exited, and there's an exit status pending
1337 available, or only the leader exited (not the whole
1338 program). In the latter case, we can't waitpid the
1339 leader's exit status until all other threads are gone.
1341 - There are 3 or more threads in the group, and a thread
1342 other than the leader exec'd. On an exec, the Linux
1343 kernel destroys all other threads (except the execing
1344 one) in the thread group, and resets the execing thread's
1345 tid to the tgid. No exit notification is sent for the
1346 execing thread -- from the ptracer's perspective, it
1347 appears as though the execing thread just vanishes.
1348 Until we reap all other threads except the leader and the
1349 execing thread, the leader will be zombie, and the
1350 execing thread will be in `D (disc sleep)'. As soon as
1351 all other threads are reaped, the execing thread changes
1352 it's tid to the tgid, and the previous (zombie) leader
1353 vanishes, giving place to the "new" leader. We could try
1354 distinguishing the exit and exec cases, by waiting once
1355 more, and seeing if something comes out, but it doesn't
1356 sound useful. The previous leader _does_ go away, and
1357 we'll re-add the new one once we see the exec event
1358 (which is just the same as what would happen if the
1359 previous leader did exit voluntarily before some other
1364 "CZL: Thread group leader %d zombie "
1365 "(it exited, or another thread execd).\n",
1368 delete_lwp (leader_lp
);
1373 /* Callback for `find_inferior'. Returns the first LWP that is not
1374 stopped. ARG is a PTID filter. */
1377 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1379 struct thread_info
*thr
= (struct thread_info
*) entry
;
1380 struct lwp_info
*lwp
;
1381 ptid_t filter
= *(ptid_t
*) arg
;
1383 if (!ptid_match (ptid_of (thr
), filter
))
1386 lwp
= get_thread_lwp (thr
);
1393 /* This function should only be called if the LWP got a SIGTRAP.
1395 Handle any tracepoint steps or hits. Return true if a tracepoint
1396 event was handled, 0 otherwise. */
1399 handle_tracepoints (struct lwp_info
*lwp
)
1401 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1402 int tpoint_related_event
= 0;
1404 /* If this tracepoint hit causes a tracing stop, we'll immediately
1405 uninsert tracepoints. To do this, we temporarily pause all
1406 threads, unpatch away, and then unpause threads. We need to make
1407 sure the unpausing doesn't resume LWP too. */
1410 /* And we need to be sure that any all-threads-stopping doesn't try
1411 to move threads out of the jump pads, as it could deadlock the
1412 inferior (LWP could be in the jump pad, maybe even holding the
1415 /* Do any necessary step collect actions. */
1416 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1418 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1420 /* See if we just hit a tracepoint and do its main collect
1422 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1426 gdb_assert (lwp
->suspended
== 0);
1427 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1429 if (tpoint_related_event
)
1432 debug_printf ("got a tracepoint event\n");
1439 /* Convenience wrapper. Returns true if LWP is presently collecting a
1443 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1444 struct fast_tpoint_collect_status
*status
)
1446 CORE_ADDR thread_area
;
1447 struct thread_info
*thread
= get_lwp_thread (lwp
);
1449 if (the_low_target
.get_thread_area
== NULL
)
1452 /* Get the thread area address. This is used to recognize which
1453 thread is which when tracing with the in-process agent library.
1454 We don't read anything from the address, and treat it as opaque;
1455 it's the address itself that we assume is unique per-thread. */
1456 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1459 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1462 /* The reason we resume in the caller, is because we want to be able
1463 to pass lwp->status_pending as WSTAT, and we need to clear
1464 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1465 refuses to resume. */
1468 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1470 struct thread_info
*saved_inferior
;
1472 saved_inferior
= current_inferior
;
1473 current_inferior
= get_lwp_thread (lwp
);
1476 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1477 && supports_fast_tracepoints ()
1478 && agent_loaded_p ())
1480 struct fast_tpoint_collect_status status
;
1484 debug_printf ("Checking whether LWP %ld needs to move out of the "
1486 lwpid_of (current_inferior
));
1488 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1491 || (WSTOPSIG (*wstat
) != SIGILL
1492 && WSTOPSIG (*wstat
) != SIGFPE
1493 && WSTOPSIG (*wstat
) != SIGSEGV
1494 && WSTOPSIG (*wstat
) != SIGBUS
))
1496 lwp
->collecting_fast_tracepoint
= r
;
1500 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1502 /* Haven't executed the original instruction yet.
1503 Set breakpoint there, and wait till it's hit,
1504 then single-step until exiting the jump pad. */
1505 lwp
->exit_jump_pad_bkpt
1506 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1510 debug_printf ("Checking whether LWP %ld needs to move out of "
1511 "the jump pad...it does\n",
1512 lwpid_of (current_inferior
));
1513 current_inferior
= saved_inferior
;
1520 /* If we get a synchronous signal while collecting, *and*
1521 while executing the (relocated) original instruction,
1522 reset the PC to point at the tpoint address, before
1523 reporting to GDB. Otherwise, it's an IPA lib bug: just
1524 report the signal to GDB, and pray for the best. */
1526 lwp
->collecting_fast_tracepoint
= 0;
1529 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1530 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1533 struct regcache
*regcache
;
1535 /* The si_addr on a few signals references the address
1536 of the faulting instruction. Adjust that as
1538 if ((WSTOPSIG (*wstat
) == SIGILL
1539 || WSTOPSIG (*wstat
) == SIGFPE
1540 || WSTOPSIG (*wstat
) == SIGBUS
1541 || WSTOPSIG (*wstat
) == SIGSEGV
)
1542 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
1543 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1544 /* Final check just to make sure we don't clobber
1545 the siginfo of non-kernel-sent signals. */
1546 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1548 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1549 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_inferior
),
1550 (PTRACE_TYPE_ARG3
) 0, &info
);
1553 regcache
= get_thread_regcache (current_inferior
, 1);
1554 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1555 lwp
->stop_pc
= status
.tpoint_addr
;
1557 /* Cancel any fast tracepoint lock this thread was
1559 force_unlock_trace_buffer ();
1562 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1565 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1566 "stopping all threads momentarily.\n");
1568 stop_all_lwps (1, lwp
);
1569 cancel_breakpoints ();
1571 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1572 lwp
->exit_jump_pad_bkpt
= NULL
;
1574 unstop_all_lwps (1, lwp
);
1576 gdb_assert (lwp
->suspended
>= 0);
1582 debug_printf ("Checking whether LWP %ld needs to move out of the "
1584 lwpid_of (current_inferior
));
1586 current_inferior
= saved_inferior
;
1590 /* Enqueue one signal in the "signals to report later when out of the
1594 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1596 struct pending_signals
*p_sig
;
1597 struct thread_info
*thread
= get_lwp_thread (lwp
);
1600 debug_printf ("Deferring signal %d for LWP %ld.\n",
1601 WSTOPSIG (*wstat
), lwpid_of (thread
));
1605 struct pending_signals
*sig
;
1607 for (sig
= lwp
->pending_signals_to_report
;
1610 debug_printf (" Already queued %d\n",
1613 debug_printf (" (no more currently queued signals)\n");
1616 /* Don't enqueue non-RT signals if they are already in the deferred
1617 queue. (SIGSTOP being the easiest signal to see ending up here
1619 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1621 struct pending_signals
*sig
;
1623 for (sig
= lwp
->pending_signals_to_report
;
1627 if (sig
->signal
== WSTOPSIG (*wstat
))
1630 debug_printf ("Not requeuing already queued non-RT signal %d"
1639 p_sig
= xmalloc (sizeof (*p_sig
));
1640 p_sig
->prev
= lwp
->pending_signals_to_report
;
1641 p_sig
->signal
= WSTOPSIG (*wstat
);
1642 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1643 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1646 lwp
->pending_signals_to_report
= p_sig
;
1649 /* Dequeue one signal from the "signals to report later when out of
1650 the jump pad" list. */
1653 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1655 struct thread_info
*thread
= get_lwp_thread (lwp
);
1657 if (lwp
->pending_signals_to_report
!= NULL
)
1659 struct pending_signals
**p_sig
;
1661 p_sig
= &lwp
->pending_signals_to_report
;
1662 while ((*p_sig
)->prev
!= NULL
)
1663 p_sig
= &(*p_sig
)->prev
;
1665 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1666 if ((*p_sig
)->info
.si_signo
!= 0)
1667 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1673 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1674 WSTOPSIG (*wstat
), lwpid_of (thread
));
1678 struct pending_signals
*sig
;
1680 for (sig
= lwp
->pending_signals_to_report
;
1683 debug_printf (" Still queued %d\n",
1686 debug_printf (" (no more queued signals)\n");
1695 /* Arrange for a breakpoint to be hit again later. We don't keep the
1696 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1697 will handle the current event, eventually we will resume this LWP,
1698 and this breakpoint will trap again. */
1701 cancel_breakpoint (struct lwp_info
*lwp
)
1703 struct thread_info
*saved_inferior
;
1705 /* There's nothing to do if we don't support breakpoints. */
1706 if (!supports_breakpoints ())
1709 /* breakpoint_at reads from current inferior. */
1710 saved_inferior
= current_inferior
;
1711 current_inferior
= get_lwp_thread (lwp
);
1713 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1716 debug_printf ("CB: Push back breakpoint for %s\n",
1717 target_pid_to_str (ptid_of (current_inferior
)));
1719 /* Back up the PC if necessary. */
1720 if (the_low_target
.decr_pc_after_break
)
1722 struct regcache
*regcache
1723 = get_thread_regcache (current_inferior
, 1);
1724 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1727 current_inferior
= saved_inferior
;
1733 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1734 paddress (lwp
->stop_pc
),
1735 target_pid_to_str (ptid_of (current_inferior
)));
1738 current_inferior
= saved_inferior
;
1742 /* Do low-level handling of the event, and check if we should go on
1743 and pass it to caller code. Return the affected lwp if we are, or
1746 static struct lwp_info
*
1747 linux_low_filter_event (ptid_t filter_ptid
, int lwpid
, int wstat
)
1749 struct lwp_info
*child
;
1750 struct thread_info
*thread
;
1752 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1754 /* If we didn't find a process, one of two things presumably happened:
1755 - A process we started and then detached from has exited. Ignore it.
1756 - A process we are controlling has forked and the new child's stop
1757 was reported to us by the kernel. Save its PID. */
1758 if (child
== NULL
&& WIFSTOPPED (wstat
))
1760 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1763 else if (child
== NULL
)
1766 thread
= get_lwp_thread (child
);
1770 child
->last_status
= wstat
;
1772 if (WIFSTOPPED (wstat
))
1774 struct process_info
*proc
;
1776 /* Architecture-specific setup after inferior is running. This
1777 needs to happen after we have attached to the inferior and it
1778 is stopped for the first time, but before we access any
1779 inferior registers. */
1780 proc
= find_process_pid (pid_of (thread
));
1781 if (proc
->private->new_inferior
)
1783 struct thread_info
*saved_inferior
;
1785 saved_inferior
= current_inferior
;
1786 current_inferior
= thread
;
1788 the_low_target
.arch_setup ();
1790 current_inferior
= saved_inferior
;
1792 proc
->private->new_inferior
= 0;
1796 /* Store the STOP_PC, with adjustment applied. This depends on the
1797 architecture being defined already (so that CHILD has a valid
1798 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1800 if (WIFSTOPPED (wstat
))
1803 && the_low_target
.get_pc
!= NULL
)
1805 struct thread_info
*saved_inferior
;
1806 struct regcache
*regcache
;
1809 saved_inferior
= current_inferior
;
1810 current_inferior
= thread
;
1811 regcache
= get_thread_regcache (current_inferior
, 1);
1812 pc
= (*the_low_target
.get_pc
) (regcache
);
1813 debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc
);
1814 current_inferior
= saved_inferior
;
1817 child
->stop_pc
= get_stop_pc (child
);
1820 /* Fetch the possibly triggered data watchpoint info and store it in
1823 On some archs, like x86, that use debug registers to set
1824 watchpoints, it's possible that the way to know which watched
1825 address trapped, is to check the register that is used to select
1826 which address to watch. Problem is, between setting the
1827 watchpoint and reading back which data address trapped, the user
1828 may change the set of watchpoints, and, as a consequence, GDB
1829 changes the debug registers in the inferior. To avoid reading
1830 back a stale stopped-data-address when that happens, we cache in
1831 LP the fact that a watchpoint trapped, and the corresponding data
1832 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1833 changes the debug registers meanwhile, we have the cached data we
1836 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
)
1838 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1840 child
->stopped_by_watchpoint
= 0;
1844 struct thread_info
*saved_inferior
;
1846 saved_inferior
= current_inferior
;
1847 current_inferior
= thread
;
1849 child
->stopped_by_watchpoint
1850 = the_low_target
.stopped_by_watchpoint ();
1852 if (child
->stopped_by_watchpoint
)
1854 if (the_low_target
.stopped_data_address
!= NULL
)
1855 child
->stopped_data_address
1856 = the_low_target
.stopped_data_address ();
1858 child
->stopped_data_address
= 0;
1861 current_inferior
= saved_inferior
;
1865 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1867 linux_enable_event_reporting (lwpid
);
1868 child
->must_set_ptrace_flags
= 0;
1871 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1872 && wstat
>> 16 != 0)
1874 handle_extended_wait (child
, wstat
);
1878 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1879 && child
->stop_expected
)
1882 debug_printf ("Expected stop.\n");
1883 child
->stop_expected
= 0;
1885 if (thread
->last_resume_kind
== resume_stop
)
1887 /* We want to report the stop to the core. Treat the
1888 SIGSTOP as a normal event. */
1890 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1892 /* Stopping threads. We don't want this SIGSTOP to end up
1893 pending in the FILTER_PTID handling below. */
1898 /* Filter out the event. */
1899 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1904 /* Check if the thread has exited. */
1905 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1906 && num_lwps (pid_of (thread
)) > 1)
1909 debug_printf ("LLW: %d exited.\n", lwpid
);
1911 /* If there is at least one more LWP, then the exit signal
1912 was not the end of the debugged application and should be
1918 if (!ptid_match (ptid_of (thread
), filter_ptid
))
1921 debug_printf ("LWP %d got an event %06x, leaving pending.\n",
1924 if (WIFSTOPPED (wstat
))
1926 child
->status_pending_p
= 1;
1927 child
->status_pending
= wstat
;
1929 if (WSTOPSIG (wstat
) != SIGSTOP
)
1931 /* Cancel breakpoint hits. The breakpoint may be
1932 removed before we fetch events from this process to
1933 report to the core. It is best not to assume the
1934 moribund breakpoints heuristic always handles these
1935 cases --- it could be too many events go through to
1936 the core before this one is handled. All-stop always
1937 cancels breakpoint hits in all threads. */
1939 && WSTOPSIG (wstat
) == SIGTRAP
1940 && cancel_breakpoint (child
))
1942 /* Throw away the SIGTRAP. */
1943 child
->status_pending_p
= 0;
1946 debug_printf ("LLW: LWP %d hit a breakpoint while"
1947 " waiting for another process;"
1948 " cancelled it\n", lwpid
);
1952 else if (WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1955 debug_printf ("LLWE: process %d exited while fetching "
1956 "event from another LWP\n", lwpid
);
1958 /* This was the last lwp in the process. Since events are
1959 serialized to GDB core, and we can't report this one
1960 right now, but GDB core and the other target layers will
1961 want to be notified about the exit code/signal, leave the
1962 status pending for the next time we're able to report
1964 mark_lwp_dead (child
, wstat
);
1973 /* When the event-loop is doing a step-over, this points at the thread
1975 ptid_t step_over_bkpt
;
1977 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1978 match FILTER_PTID (leaving others pending). The PTIDs can be:
1979 minus_one_ptid, to specify any child; a pid PTID, specifying all
1980 lwps of a thread group; or a PTID representing a single lwp. Store
1981 the stop status through the status pointer WSTAT. OPTIONS is
1982 passed to the waitpid call. Return 0 if no event was found and
1983 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1984 was found. Return the PID of the stopped child otherwise. */
1987 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1988 int *wstatp
, int options
)
1990 struct thread_info
*event_thread
;
1991 struct lwp_info
*event_child
, *requested_child
;
1992 sigset_t block_mask
, prev_mask
;
1995 /* N.B. event_thread points to the thread_info struct that contains
1996 event_child. Keep them in sync. */
1997 event_thread
= NULL
;
1999 requested_child
= NULL
;
2001 /* Check for a lwp with a pending status. */
2003 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2005 event_thread
= (struct thread_info
*)
2006 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2007 if (event_thread
!= NULL
)
2008 event_child
= get_thread_lwp (event_thread
);
2009 if (debug_threads
&& event_thread
)
2010 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2012 else if (!ptid_equal (filter_ptid
, null_ptid
))
2014 requested_child
= find_lwp_pid (filter_ptid
);
2016 if (stopping_threads
== NOT_STOPPING_THREADS
2017 && requested_child
->status_pending_p
2018 && requested_child
->collecting_fast_tracepoint
)
2020 enqueue_one_deferred_signal (requested_child
,
2021 &requested_child
->status_pending
);
2022 requested_child
->status_pending_p
= 0;
2023 requested_child
->status_pending
= 0;
2024 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2027 if (requested_child
->suspended
2028 && requested_child
->status_pending_p
)
2029 fatal ("requesting an event out of a suspended child?");
2031 if (requested_child
->status_pending_p
)
2033 event_child
= requested_child
;
2034 event_thread
= get_lwp_thread (event_child
);
2038 if (event_child
!= NULL
)
2041 debug_printf ("Got an event from pending child %ld (%04x)\n",
2042 lwpid_of (event_thread
), event_child
->status_pending
);
2043 *wstatp
= event_child
->status_pending
;
2044 event_child
->status_pending_p
= 0;
2045 event_child
->status_pending
= 0;
2046 current_inferior
= event_thread
;
2047 return lwpid_of (event_thread
);
2050 /* But if we don't find a pending event, we'll have to wait.
2052 We only enter this loop if no process has a pending wait status.
2053 Thus any action taken in response to a wait status inside this
2054 loop is responding as soon as we detect the status, not after any
2057 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2058 all signals while here. */
2059 sigfillset (&block_mask
);
2060 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2062 while (event_child
== NULL
)
2066 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2069 - If the thread group leader exits while other threads in the
2070 thread group still exist, waitpid(TGID, ...) hangs. That
2071 waitpid won't return an exit status until the other threads
2072 in the group are reaped.
2074 - When a non-leader thread execs, that thread just vanishes
2075 without reporting an exit (so we'd hang if we waited for it
2076 explicitly in that case). The exec event is reported to
2077 the TGID pid (although we don't currently enable exec
2080 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2083 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2084 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2090 debug_printf ("LLW: waitpid %ld received %s\n",
2091 (long) ret
, status_to_str (*wstatp
));
2094 event_child
= linux_low_filter_event (filter_ptid
,
2096 if (event_child
!= NULL
)
2098 /* We got an event to report to the core. */
2099 event_thread
= get_lwp_thread (event_child
);
2103 /* Retry until nothing comes out of waitpid. A single
2104 SIGCHLD can indicate more than one child stopped. */
2108 /* Check for zombie thread group leaders. Those can't be reaped
2109 until all other threads in the thread group are. */
2110 check_zombie_leaders ();
2112 /* If there are no resumed children left in the set of LWPs we
2113 want to wait for, bail. We can't just block in
2114 waitpid/sigsuspend, because lwps might have been left stopped
2115 in trace-stop state, and we'd be stuck forever waiting for
2116 their status to change (which would only happen if we resumed
2117 them). Even if WNOHANG is set, this return code is preferred
2118 over 0 (below), as it is more detailed. */
2119 if ((find_inferior (&all_threads
,
2120 not_stopped_callback
,
2121 &wait_ptid
) == NULL
))
2124 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2125 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2129 /* No interesting event to report to the caller. */
2130 if ((options
& WNOHANG
))
2133 debug_printf ("WNOHANG set, no event found\n");
2135 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2139 /* Block until we get an event reported with SIGCHLD. */
2141 debug_printf ("sigsuspend'ing\n");
2143 sigsuspend (&prev_mask
);
2144 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2148 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2150 current_inferior
= event_thread
;
2152 /* Check for thread exit. */
2153 if (! WIFSTOPPED (*wstatp
))
2155 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2158 debug_printf ("LWP %d is the last lwp of process. "
2159 "Process %ld exiting.\n",
2160 pid_of (event_thread
), lwpid_of (event_thread
));
2161 return lwpid_of (event_thread
);
2164 return lwpid_of (event_thread
);
2167 /* Wait for an event from child(ren) PTID. PTIDs can be:
2168 minus_one_ptid, to specify any child; a pid PTID, specifying all
2169 lwps of a thread group; or a PTID representing a single lwp. Store
2170 the stop status through the status pointer WSTAT. OPTIONS is
2171 passed to the waitpid call. Return 0 if no event was found and
2172 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2173 was found. Return the PID of the stopped child otherwise. */
2176 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2178 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2181 /* Count the LWP's that have had events. */
2184 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2186 struct thread_info
*thread
= (struct thread_info
*) entry
;
2187 struct lwp_info
*lp
= get_thread_lwp (thread
);
2190 gdb_assert (count
!= NULL
);
2192 /* Count only resumed LWPs that have a SIGTRAP event pending that
2193 should be reported to GDB. */
2194 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2195 && thread
->last_resume_kind
!= resume_stop
2196 && lp
->status_pending_p
2197 && WIFSTOPPED (lp
->status_pending
)
2198 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2199 && !breakpoint_inserted_here (lp
->stop_pc
))
2205 /* Select the LWP (if any) that is currently being single-stepped. */
2208 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2210 struct thread_info
*thread
= (struct thread_info
*) entry
;
2211 struct lwp_info
*lp
= get_thread_lwp (thread
);
2213 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2214 && thread
->last_resume_kind
== resume_step
2215 && lp
->status_pending_p
)
2221 /* Select the Nth LWP that has had a SIGTRAP event that should be
2225 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2227 struct thread_info
*thread
= (struct thread_info
*) entry
;
2228 struct lwp_info
*lp
= get_thread_lwp (thread
);
2229 int *selector
= data
;
2231 gdb_assert (selector
!= NULL
);
2233 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2234 if (thread
->last_resume_kind
!= resume_stop
2235 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2236 && lp
->status_pending_p
2237 && WIFSTOPPED (lp
->status_pending
)
2238 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2239 && !breakpoint_inserted_here (lp
->stop_pc
))
2240 if ((*selector
)-- == 0)
2247 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2249 struct thread_info
*thread
= (struct thread_info
*) entry
;
2250 struct lwp_info
*lp
= get_thread_lwp (thread
);
2251 struct lwp_info
*event_lp
= data
;
2253 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2257 /* If a LWP other than the LWP that we're reporting an event for has
2258 hit a GDB breakpoint (as opposed to some random trap signal),
2259 then just arrange for it to hit it again later. We don't keep
2260 the SIGTRAP status and don't forward the SIGTRAP signal to the
2261 LWP. We will handle the current event, eventually we will resume
2262 all LWPs, and this one will get its breakpoint trap again.
2264 If we do not do this, then we run the risk that the user will
2265 delete or disable the breakpoint, but the LWP will have already
2268 if (thread
->last_resume_kind
!= resume_stop
2269 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2270 && lp
->status_pending_p
2271 && WIFSTOPPED (lp
->status_pending
)
2272 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2274 && !lp
->stopped_by_watchpoint
2275 && cancel_breakpoint (lp
))
2276 /* Throw away the SIGTRAP. */
2277 lp
->status_pending_p
= 0;
2283 linux_cancel_breakpoints (void)
2285 find_inferior (&all_threads
, cancel_breakpoints_callback
, NULL
);
2288 /* Select one LWP out of those that have events pending. */
2291 select_event_lwp (struct lwp_info
**orig_lp
)
2294 int random_selector
;
2295 struct thread_info
*event_thread
;
2297 /* Give preference to any LWP that is being single-stepped. */
2299 = (struct thread_info
*) find_inferior (&all_threads
,
2300 select_singlestep_lwp_callback
,
2302 if (event_thread
!= NULL
)
2305 debug_printf ("SEL: Select single-step %s\n",
2306 target_pid_to_str (ptid_of (event_thread
)));
2310 /* No single-stepping LWP. Select one at random, out of those
2311 which have had SIGTRAP events. */
2313 /* First see how many SIGTRAP events we have. */
2314 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2316 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2317 random_selector
= (int)
2318 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2320 if (debug_threads
&& num_events
> 1)
2321 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2322 num_events
, random_selector
);
2325 = (struct thread_info
*) find_inferior (&all_threads
,
2326 select_event_lwp_callback
,
2330 if (event_thread
!= NULL
)
2332 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2334 /* Switch the event LWP. */
2335 *orig_lp
= event_lp
;
2339 /* Decrement the suspend count of an LWP. */
2342 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2344 struct thread_info
*thread
= (struct thread_info
*) entry
;
2345 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2347 /* Ignore EXCEPT. */
2353 gdb_assert (lwp
->suspended
>= 0);
2357 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2361 unsuspend_all_lwps (struct lwp_info
*except
)
2363 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2366 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2367 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2369 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2370 static ptid_t
linux_wait_1 (ptid_t ptid
,
2371 struct target_waitstatus
*ourstatus
,
2372 int target_options
);
2374 /* Stabilize threads (move out of jump pads).
2376 If a thread is midway collecting a fast tracepoint, we need to
2377 finish the collection and move it out of the jump pad before
2378 reporting the signal.
2380 This avoids recursion while collecting (when a signal arrives
2381 midway, and the signal handler itself collects), which would trash
2382 the trace buffer. In case the user set a breakpoint in a signal
2383 handler, this avoids the backtrace showing the jump pad, etc..
2384 Most importantly, there are certain things we can't do safely if
2385 threads are stopped in a jump pad (or in its callee's). For
2388 - starting a new trace run. A thread still collecting the
2389 previous run, could trash the trace buffer when resumed. The trace
2390 buffer control structures would have been reset but the thread had
2391 no way to tell. The thread could even midway memcpy'ing to the
2392 buffer, which would mean that when resumed, it would clobber the
2393 trace buffer that had been set for a new run.
2395 - we can't rewrite/reuse the jump pads for new tracepoints
2396 safely. Say you do tstart while a thread is stopped midway while
2397 collecting. When the thread is later resumed, it finishes the
2398 collection, and returns to the jump pad, to execute the original
2399 instruction that was under the tracepoint jump at the time the
2400 older run had been started. If the jump pad had been rewritten
2401 since for something else in the new run, the thread would now
2402 execute the wrong / random instructions. */
2405 linux_stabilize_threads (void)
2407 struct thread_info
*save_inferior
;
2408 struct thread_info
*thread_stuck
;
2411 = (struct thread_info
*) find_inferior (&all_threads
,
2412 stuck_in_jump_pad_callback
,
2414 if (thread_stuck
!= NULL
)
2417 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2418 lwpid_of (thread_stuck
));
2422 save_inferior
= current_inferior
;
2424 stabilizing_threads
= 1;
2427 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2429 /* Loop until all are stopped out of the jump pads. */
2430 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2432 struct target_waitstatus ourstatus
;
2433 struct lwp_info
*lwp
;
2436 /* Note that we go through the full wait even loop. While
2437 moving threads out of jump pad, we need to be able to step
2438 over internal breakpoints and such. */
2439 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2441 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2443 lwp
= get_thread_lwp (current_inferior
);
2448 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2449 || current_inferior
->last_resume_kind
== resume_stop
)
2451 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2452 enqueue_one_deferred_signal (lwp
, &wstat
);
2457 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2459 stabilizing_threads
= 0;
2461 current_inferior
= save_inferior
;
2466 = (struct thread_info
*) find_inferior (&all_threads
,
2467 stuck_in_jump_pad_callback
,
2469 if (thread_stuck
!= NULL
)
2470 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2471 lwpid_of (thread_stuck
));
2475 /* Wait for process, returns status. */
2478 linux_wait_1 (ptid_t ptid
,
2479 struct target_waitstatus
*ourstatus
, int target_options
)
2482 struct lwp_info
*event_child
;
2485 int step_over_finished
;
2486 int bp_explains_trap
;
2487 int maybe_internal_trap
;
2495 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2498 /* Translate generic target options into linux options. */
2500 if (target_options
& TARGET_WNOHANG
)
2504 bp_explains_trap
= 0;
2507 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2509 /* If we were only supposed to resume one thread, only wait for
2510 that thread - if it's still alive. If it died, however - which
2511 can happen if we're coming from the thread death case below -
2512 then we need to make sure we restart the other threads. We could
2513 pick a thread at random or restart all; restarting all is less
2516 && !ptid_equal (cont_thread
, null_ptid
)
2517 && !ptid_equal (cont_thread
, minus_one_ptid
))
2519 struct thread_info
*thread
;
2521 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2524 /* No stepping, no signal - unless one is pending already, of course. */
2527 struct thread_resume resume_info
;
2528 resume_info
.thread
= minus_one_ptid
;
2529 resume_info
.kind
= resume_continue
;
2530 resume_info
.sig
= 0;
2531 linux_resume (&resume_info
, 1);
2537 if (ptid_equal (step_over_bkpt
, null_ptid
))
2538 pid
= linux_wait_for_event (ptid
, &w
, options
);
2542 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2543 target_pid_to_str (step_over_bkpt
));
2544 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2549 gdb_assert (target_options
& TARGET_WNOHANG
);
2553 debug_printf ("linux_wait_1 ret = null_ptid, "
2554 "TARGET_WAITKIND_IGNORE\n");
2558 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2565 debug_printf ("linux_wait_1 ret = null_ptid, "
2566 "TARGET_WAITKIND_NO_RESUMED\n");
2570 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2574 event_child
= get_thread_lwp (current_inferior
);
2576 /* linux_wait_for_event only returns an exit status for the last
2577 child of a process. Report it. */
2578 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2582 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2583 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2587 debug_printf ("linux_wait_1 ret = %s, exited with "
2589 target_pid_to_str (ptid_of (current_inferior
)),
2596 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2597 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2601 debug_printf ("linux_wait_1 ret = %s, terminated with "
2603 target_pid_to_str (ptid_of (current_inferior
)),
2609 return ptid_of (current_inferior
);
2612 /* If this event was not handled before, and is not a SIGTRAP, we
2613 report it. SIGILL and SIGSEGV are also treated as traps in case
2614 a breakpoint is inserted at the current PC. If this target does
2615 not support internal breakpoints at all, we also report the
2616 SIGTRAP without further processing; it's of no concern to us. */
2618 = (supports_breakpoints ()
2619 && (WSTOPSIG (w
) == SIGTRAP
2620 || ((WSTOPSIG (w
) == SIGILL
2621 || WSTOPSIG (w
) == SIGSEGV
)
2622 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2624 if (maybe_internal_trap
)
2626 /* Handle anything that requires bookkeeping before deciding to
2627 report the event or continue waiting. */
2629 /* First check if we can explain the SIGTRAP with an internal
2630 breakpoint, or if we should possibly report the event to GDB.
2631 Do this before anything that may remove or insert a
2633 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2635 /* We have a SIGTRAP, possibly a step-over dance has just
2636 finished. If so, tweak the state machine accordingly,
2637 reinsert breakpoints and delete any reinsert (software
2638 single-step) breakpoints. */
2639 step_over_finished
= finish_step_over (event_child
);
2641 /* Now invoke the callbacks of any internal breakpoints there. */
2642 check_breakpoints (event_child
->stop_pc
);
2644 /* Handle tracepoint data collecting. This may overflow the
2645 trace buffer, and cause a tracing stop, removing
2647 trace_event
= handle_tracepoints (event_child
);
2649 if (bp_explains_trap
)
2651 /* If we stepped or ran into an internal breakpoint, we've
2652 already handled it. So next time we resume (from this
2653 PC), we should step over it. */
2655 debug_printf ("Hit a gdbserver breakpoint.\n");
2657 if (breakpoint_here (event_child
->stop_pc
))
2658 event_child
->need_step_over
= 1;
2663 /* We have some other signal, possibly a step-over dance was in
2664 progress, and it should be cancelled too. */
2665 step_over_finished
= finish_step_over (event_child
);
2668 /* We have all the data we need. Either report the event to GDB, or
2669 resume threads and keep waiting for more. */
2671 /* If we're collecting a fast tracepoint, finish the collection and
2672 move out of the jump pad before delivering a signal. See
2673 linux_stabilize_threads. */
2676 && WSTOPSIG (w
) != SIGTRAP
2677 && supports_fast_tracepoints ()
2678 && agent_loaded_p ())
2681 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2682 "to defer or adjust it.\n",
2683 WSTOPSIG (w
), lwpid_of (current_inferior
));
2685 /* Allow debugging the jump pad itself. */
2686 if (current_inferior
->last_resume_kind
!= resume_step
2687 && maybe_move_out_of_jump_pad (event_child
, &w
))
2689 enqueue_one_deferred_signal (event_child
, &w
);
2692 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2693 WSTOPSIG (w
), lwpid_of (current_inferior
));
2695 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2700 if (event_child
->collecting_fast_tracepoint
)
2703 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2704 "Check if we're already there.\n",
2705 lwpid_of (current_inferior
),
2706 event_child
->collecting_fast_tracepoint
);
2710 event_child
->collecting_fast_tracepoint
2711 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2713 if (event_child
->collecting_fast_tracepoint
!= 1)
2715 /* No longer need this breakpoint. */
2716 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2719 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2720 "stopping all threads momentarily.\n");
2722 /* Other running threads could hit this breakpoint.
2723 We don't handle moribund locations like GDB does,
2724 instead we always pause all threads when removing
2725 breakpoints, so that any step-over or
2726 decr_pc_after_break adjustment is always taken
2727 care of while the breakpoint is still
2729 stop_all_lwps (1, event_child
);
2730 cancel_breakpoints ();
2732 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2733 event_child
->exit_jump_pad_bkpt
= NULL
;
2735 unstop_all_lwps (1, event_child
);
2737 gdb_assert (event_child
->suspended
>= 0);
2741 if (event_child
->collecting_fast_tracepoint
== 0)
2744 debug_printf ("fast tracepoint finished "
2745 "collecting successfully.\n");
2747 /* We may have a deferred signal to report. */
2748 if (dequeue_one_deferred_signal (event_child
, &w
))
2751 debug_printf ("dequeued one signal.\n");
2756 debug_printf ("no deferred signals.\n");
2758 if (stabilizing_threads
)
2760 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2761 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2765 debug_printf ("linux_wait_1 ret = %s, stopped "
2766 "while stabilizing threads\n",
2767 target_pid_to_str (ptid_of (current_inferior
)));
2771 return ptid_of (current_inferior
);
2777 /* Check whether GDB would be interested in this event. */
2779 /* If GDB is not interested in this signal, don't stop other
2780 threads, and don't report it to GDB. Just resume the inferior
2781 right away. We do this for threading-related signals as well as
2782 any that GDB specifically requested we ignore. But never ignore
2783 SIGSTOP if we sent it ourselves, and do not ignore signals when
2784 stepping - they may require special handling to skip the signal
2786 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2789 && current_inferior
->last_resume_kind
!= resume_step
2791 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2792 (current_process ()->private->thread_db
!= NULL
2793 && (WSTOPSIG (w
) == __SIGRTMIN
2794 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2797 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2798 && !(WSTOPSIG (w
) == SIGSTOP
2799 && current_inferior
->last_resume_kind
== resume_stop
))))
2801 siginfo_t info
, *info_p
;
2804 debug_printf ("Ignored signal %d for LWP %ld.\n",
2805 WSTOPSIG (w
), lwpid_of (current_inferior
));
2807 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
2808 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2812 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2813 WSTOPSIG (w
), info_p
);
2817 /* Note that all addresses are always "out of the step range" when
2818 there's no range to begin with. */
2819 in_step_range
= lwp_in_step_range (event_child
);
2821 /* If GDB wanted this thread to single step, and the thread is out
2822 of the step range, we always want to report the SIGTRAP, and let
2823 GDB handle it. Watchpoints should always be reported. So should
2824 signals we can't explain. A SIGTRAP we can't explain could be a
2825 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2826 do, we're be able to handle GDB breakpoints on top of internal
2827 breakpoints, by handling the internal breakpoint and still
2828 reporting the event to GDB. If we don't, we're out of luck, GDB
2829 won't see the breakpoint hit. */
2830 report_to_gdb
= (!maybe_internal_trap
2831 || (current_inferior
->last_resume_kind
== resume_step
2833 || event_child
->stopped_by_watchpoint
2834 || (!step_over_finished
&& !in_step_range
2835 && !bp_explains_trap
&& !trace_event
)
2836 || (gdb_breakpoint_here (event_child
->stop_pc
)
2837 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2838 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2840 run_breakpoint_commands (event_child
->stop_pc
);
2842 /* We found no reason GDB would want us to stop. We either hit one
2843 of our own breakpoints, or finished an internal step GDB
2844 shouldn't know about. */
2849 if (bp_explains_trap
)
2850 debug_printf ("Hit a gdbserver breakpoint.\n");
2851 if (step_over_finished
)
2852 debug_printf ("Step-over finished.\n");
2854 debug_printf ("Tracepoint event.\n");
2855 if (lwp_in_step_range (event_child
))
2856 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2857 paddress (event_child
->stop_pc
),
2858 paddress (event_child
->step_range_start
),
2859 paddress (event_child
->step_range_end
));
2862 /* We're not reporting this breakpoint to GDB, so apply the
2863 decr_pc_after_break adjustment to the inferior's regcache
2866 if (the_low_target
.set_pc
!= NULL
)
2868 struct regcache
*regcache
2869 = get_thread_regcache (current_inferior
, 1);
2870 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2873 /* We may have finished stepping over a breakpoint. If so,
2874 we've stopped and suspended all LWPs momentarily except the
2875 stepping one. This is where we resume them all again. We're
2876 going to keep waiting, so use proceed, which handles stepping
2877 over the next breakpoint. */
2879 debug_printf ("proceeding all threads.\n");
2881 if (step_over_finished
)
2882 unsuspend_all_lwps (event_child
);
2884 proceed_all_lwps ();
2890 if (current_inferior
->last_resume_kind
== resume_step
)
2892 if (event_child
->step_range_start
== event_child
->step_range_end
)
2893 debug_printf ("GDB wanted to single-step, reporting event.\n");
2894 else if (!lwp_in_step_range (event_child
))
2895 debug_printf ("Out of step range, reporting event.\n");
2897 if (event_child
->stopped_by_watchpoint
)
2898 debug_printf ("Stopped by watchpoint.\n");
2899 if (gdb_breakpoint_here (event_child
->stop_pc
))
2900 debug_printf ("Stopped by GDB breakpoint.\n");
2902 debug_printf ("Hit a non-gdbserver trap event.\n");
2905 /* Alright, we're going to report a stop. */
2907 if (!non_stop
&& !stabilizing_threads
)
2909 /* In all-stop, stop all threads. */
2910 stop_all_lwps (0, NULL
);
2912 /* If we're not waiting for a specific LWP, choose an event LWP
2913 from among those that have had events. Giving equal priority
2914 to all LWPs that have had events helps prevent
2916 if (ptid_equal (ptid
, minus_one_ptid
))
2918 event_child
->status_pending_p
= 1;
2919 event_child
->status_pending
= w
;
2921 select_event_lwp (&event_child
);
2923 /* current_inferior and event_child must stay in sync. */
2924 current_inferior
= get_lwp_thread (event_child
);
2926 event_child
->status_pending_p
= 0;
2927 w
= event_child
->status_pending
;
2930 /* Now that we've selected our final event LWP, cancel any
2931 breakpoints in other LWPs that have hit a GDB breakpoint.
2932 See the comment in cancel_breakpoints_callback to find out
2934 find_inferior (&all_threads
, cancel_breakpoints_callback
, event_child
);
2936 /* If we were going a step-over, all other threads but the stepping one
2937 had been paused in start_step_over, with their suspend counts
2938 incremented. We don't want to do a full unstop/unpause, because we're
2939 in all-stop mode (so we want threads stopped), but we still need to
2940 unsuspend the other threads, to decrement their `suspended' count
2942 if (step_over_finished
)
2943 unsuspend_all_lwps (event_child
);
2945 /* Stabilize threads (move out of jump pads). */
2946 stabilize_threads ();
2950 /* If we just finished a step-over, then all threads had been
2951 momentarily paused. In all-stop, that's fine, we want
2952 threads stopped by now anyway. In non-stop, we need to
2953 re-resume threads that GDB wanted to be running. */
2954 if (step_over_finished
)
2955 unstop_all_lwps (1, event_child
);
2958 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2960 if (current_inferior
->last_resume_kind
== resume_stop
2961 && WSTOPSIG (w
) == SIGSTOP
)
2963 /* A thread that has been requested to stop by GDB with vCont;t,
2964 and it stopped cleanly, so report as SIG0. The use of
2965 SIGSTOP is an implementation detail. */
2966 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2968 else if (current_inferior
->last_resume_kind
== resume_stop
2969 && WSTOPSIG (w
) != SIGSTOP
)
2971 /* A thread that has been requested to stop by GDB with vCont;t,
2972 but, it stopped for other reasons. */
2973 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2977 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2980 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2984 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2985 target_pid_to_str (ptid_of (current_inferior
)),
2986 ourstatus
->kind
, ourstatus
->value
.sig
);
2990 return ptid_of (current_inferior
);
2993 /* Get rid of any pending event in the pipe. */
2995 async_file_flush (void)
3001 ret
= read (linux_event_pipe
[0], &buf
, 1);
3002 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3005 /* Put something in the pipe, so the event loop wakes up. */
3007 async_file_mark (void)
3011 async_file_flush ();
3014 ret
= write (linux_event_pipe
[1], "+", 1);
3015 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3017 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3018 be awakened anyway. */
3022 linux_wait (ptid_t ptid
,
3023 struct target_waitstatus
*ourstatus
, int target_options
)
3027 /* Flush the async file first. */
3028 if (target_is_async_p ())
3029 async_file_flush ();
3031 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3033 /* If at least one stop was reported, there may be more. A single
3034 SIGCHLD can signal more than one child stop. */
3035 if (target_is_async_p ()
3036 && (target_options
& TARGET_WNOHANG
) != 0
3037 && !ptid_equal (event_ptid
, null_ptid
))
3043 /* Send a signal to an LWP. */
3046 kill_lwp (unsigned long lwpid
, int signo
)
3048 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3049 fails, then we are not using nptl threads and we should be using kill. */
3053 static int tkill_failed
;
3060 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3061 if (errno
!= ENOSYS
)
3068 return kill (lwpid
, signo
);
3072 linux_stop_lwp (struct lwp_info
*lwp
)
3078 send_sigstop (struct lwp_info
*lwp
)
3082 pid
= lwpid_of (get_lwp_thread (lwp
));
3084 /* If we already have a pending stop signal for this process, don't
3086 if (lwp
->stop_expected
)
3089 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3095 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3097 lwp
->stop_expected
= 1;
3098 kill_lwp (pid
, SIGSTOP
);
3102 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3104 struct thread_info
*thread
= (struct thread_info
*) entry
;
3105 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3107 /* Ignore EXCEPT. */
3118 /* Increment the suspend count of an LWP, and stop it, if not stopped
3121 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3124 struct thread_info
*thread
= (struct thread_info
*) entry
;
3125 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3127 /* Ignore EXCEPT. */
3133 return send_sigstop_callback (entry
, except
);
3137 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3139 /* It's dead, really. */
3142 /* Store the exit status for later. */
3143 lwp
->status_pending_p
= 1;
3144 lwp
->status_pending
= wstat
;
3146 /* Prevent trying to stop it. */
3149 /* No further stops are expected from a dead lwp. */
3150 lwp
->stop_expected
= 0;
3153 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3156 wait_for_sigstop (void)
3158 struct thread_info
*saved_inferior
;
3163 saved_inferior
= current_inferior
;
3164 if (saved_inferior
!= NULL
)
3165 saved_tid
= saved_inferior
->entry
.id
;
3167 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3170 debug_printf ("wait_for_sigstop: pulling events\n");
3172 /* Passing NULL_PTID as filter indicates we want all events to be
3173 left pending. Eventually this returns when there are no
3174 unwaited-for children left. */
3175 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3177 gdb_assert (ret
== -1);
3179 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3180 current_inferior
= saved_inferior
;
3184 debug_printf ("Previously current thread died.\n");
3188 /* We can't change the current inferior behind GDB's back,
3189 otherwise, a subsequent command may apply to the wrong
3191 current_inferior
= NULL
;
3195 /* Set a valid thread as current. */
3196 set_desired_inferior (0);
3201 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3202 move it out, because we need to report the stop event to GDB. For
3203 example, if the user puts a breakpoint in the jump pad, it's
3204 because she wants to debug it. */
3207 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3209 struct thread_info
*thread
= (struct thread_info
*) entry
;
3210 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3212 gdb_assert (lwp
->suspended
== 0);
3213 gdb_assert (lwp
->stopped
);
3215 /* Allow debugging the jump pad, gdb_collect, etc.. */
3216 return (supports_fast_tracepoints ()
3217 && agent_loaded_p ()
3218 && (gdb_breakpoint_here (lwp
->stop_pc
)
3219 || lwp
->stopped_by_watchpoint
3220 || thread
->last_resume_kind
== resume_step
)
3221 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3225 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3227 struct thread_info
*thread
= (struct thread_info
*) entry
;
3228 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3231 gdb_assert (lwp
->suspended
== 0);
3232 gdb_assert (lwp
->stopped
);
3234 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3236 /* Allow debugging the jump pad, gdb_collect, etc. */
3237 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3238 && !lwp
->stopped_by_watchpoint
3239 && thread
->last_resume_kind
!= resume_step
3240 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3243 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3248 lwp
->status_pending_p
= 0;
3249 enqueue_one_deferred_signal (lwp
, wstat
);
3252 debug_printf ("Signal %d for LWP %ld deferred "
3254 WSTOPSIG (*wstat
), lwpid_of (thread
));
3257 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3264 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3266 struct thread_info
*thread
= (struct thread_info
*) entry
;
3267 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3276 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3277 If SUSPEND, then also increase the suspend count of every LWP,
3281 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3283 /* Should not be called recursively. */
3284 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3289 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3290 suspend
? "stop-and-suspend" : "stop",
3292 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3296 stopping_threads
= (suspend
3297 ? STOPPING_AND_SUSPENDING_THREADS
3298 : STOPPING_THREADS
);
3301 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3303 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3304 wait_for_sigstop ();
3305 stopping_threads
= NOT_STOPPING_THREADS
;
3309 debug_printf ("stop_all_lwps done, setting stopping_threads "
3310 "back to !stopping\n");
3315 /* Resume execution of the inferior process.
3316 If STEP is nonzero, single-step it.
3317 If SIGNAL is nonzero, give it that signal. */
3320 linux_resume_one_lwp (struct lwp_info
*lwp
,
3321 int step
, int signal
, siginfo_t
*info
)
3323 struct thread_info
*thread
= get_lwp_thread (lwp
);
3324 struct thread_info
*saved_inferior
;
3325 int fast_tp_collecting
;
3327 if (lwp
->stopped
== 0)
3330 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3332 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3334 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3335 user used the "jump" command, or "set $pc = foo"). */
3336 if (lwp
->stop_pc
!= get_pc (lwp
))
3338 /* Collecting 'while-stepping' actions doesn't make sense
3340 release_while_stepping_state_list (thread
);
3343 /* If we have pending signals or status, and a new signal, enqueue the
3344 signal. Also enqueue the signal if we are waiting to reinsert a
3345 breakpoint; it will be picked up again below. */
3347 && (lwp
->status_pending_p
3348 || lwp
->pending_signals
!= NULL
3349 || lwp
->bp_reinsert
!= 0
3350 || fast_tp_collecting
))
3352 struct pending_signals
*p_sig
;
3353 p_sig
= xmalloc (sizeof (*p_sig
));
3354 p_sig
->prev
= lwp
->pending_signals
;
3355 p_sig
->signal
= signal
;
3357 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3359 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3360 lwp
->pending_signals
= p_sig
;
3363 if (lwp
->status_pending_p
)
3366 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3367 " has pending status\n",
3368 lwpid_of (thread
), step
? "step" : "continue", signal
,
3369 lwp
->stop_expected
? "expected" : "not expected");
3373 saved_inferior
= current_inferior
;
3374 current_inferior
= thread
;
3377 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3378 lwpid_of (thread
), step
? "step" : "continue", signal
,
3379 lwp
->stop_expected
? "expected" : "not expected");
3381 /* This bit needs some thinking about. If we get a signal that
3382 we must report while a single-step reinsert is still pending,
3383 we often end up resuming the thread. It might be better to
3384 (ew) allow a stack of pending events; then we could be sure that
3385 the reinsert happened right away and not lose any signals.
3387 Making this stack would also shrink the window in which breakpoints are
3388 uninserted (see comment in linux_wait_for_lwp) but not enough for
3389 complete correctness, so it won't solve that problem. It may be
3390 worthwhile just to solve this one, however. */
3391 if (lwp
->bp_reinsert
!= 0)
3394 debug_printf (" pending reinsert at 0x%s\n",
3395 paddress (lwp
->bp_reinsert
));
3397 if (can_hardware_single_step ())
3399 if (fast_tp_collecting
== 0)
3402 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3404 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3411 /* Postpone any pending signal. It was enqueued above. */
3415 if (fast_tp_collecting
== 1)
3418 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3419 " (exit-jump-pad-bkpt)\n",
3422 /* Postpone any pending signal. It was enqueued above. */
3425 else if (fast_tp_collecting
== 2)
3428 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3429 " single-stepping\n",
3432 if (can_hardware_single_step ())
3435 fatal ("moving out of jump pad single-stepping"
3436 " not implemented on this target");
3438 /* Postpone any pending signal. It was enqueued above. */
3442 /* If we have while-stepping actions in this thread set it stepping.
3443 If we have a signal to deliver, it may or may not be set to
3444 SIG_IGN, we don't know. Assume so, and allow collecting
3445 while-stepping into a signal handler. A possible smart thing to
3446 do would be to set an internal breakpoint at the signal return
3447 address, continue, and carry on catching this while-stepping
3448 action only when that breakpoint is hit. A future
3450 if (thread
->while_stepping
!= NULL
3451 && can_hardware_single_step ())
3454 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3459 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3461 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3462 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3463 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3466 /* If we have pending signals, consume one unless we are trying to
3467 reinsert a breakpoint or we're trying to finish a fast tracepoint
3469 if (lwp
->pending_signals
!= NULL
3470 && lwp
->bp_reinsert
== 0
3471 && fast_tp_collecting
== 0)
3473 struct pending_signals
**p_sig
;
3475 p_sig
= &lwp
->pending_signals
;
3476 while ((*p_sig
)->prev
!= NULL
)
3477 p_sig
= &(*p_sig
)->prev
;
3479 signal
= (*p_sig
)->signal
;
3480 if ((*p_sig
)->info
.si_signo
!= 0)
3481 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3488 if (the_low_target
.prepare_to_resume
!= NULL
)
3489 the_low_target
.prepare_to_resume (lwp
);
3491 regcache_invalidate_thread (thread
);
3494 lwp
->stopped_by_watchpoint
= 0;
3495 lwp
->stepping
= step
;
3496 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3497 (PTRACE_TYPE_ARG3
) 0,
3498 /* Coerce to a uintptr_t first to avoid potential gcc warning
3499 of coercing an 8 byte integer to a 4 byte pointer. */
3500 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3502 current_inferior
= saved_inferior
;
3505 /* ESRCH from ptrace either means that the thread was already
3506 running (an error) or that it is gone (a race condition). If
3507 it's gone, we will get a notification the next time we wait,
3508 so we can ignore the error. We could differentiate these
3509 two, but it's tricky without waiting; the thread still exists
3510 as a zombie, so sending it signal 0 would succeed. So just
3515 perror_with_name ("ptrace");
3519 struct thread_resume_array
3521 struct thread_resume
*resume
;
3525 /* This function is called once per thread via find_inferior.
3526 ARG is a pointer to a thread_resume_array struct.
3527 We look up the thread specified by ENTRY in ARG, and mark the thread
3528 with a pointer to the appropriate resume request.
3530 This algorithm is O(threads * resume elements), but resume elements
3531 is small (and will remain small at least until GDB supports thread
3535 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3537 struct thread_info
*thread
= (struct thread_info
*) entry
;
3538 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3540 struct thread_resume_array
*r
;
3544 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3546 ptid_t ptid
= r
->resume
[ndx
].thread
;
3547 if (ptid_equal (ptid
, minus_one_ptid
)
3548 || ptid_equal (ptid
, entry
->id
)
3549 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3551 || (ptid_get_pid (ptid
) == pid_of (thread
)
3552 && (ptid_is_pid (ptid
)
3553 || ptid_get_lwp (ptid
) == -1)))
3555 if (r
->resume
[ndx
].kind
== resume_stop
3556 && thread
->last_resume_kind
== resume_stop
)
3559 debug_printf ("already %s LWP %ld at GDB's request\n",
3560 (thread
->last_status
.kind
3561 == TARGET_WAITKIND_STOPPED
)
3569 lwp
->resume
= &r
->resume
[ndx
];
3570 thread
->last_resume_kind
= lwp
->resume
->kind
;
3572 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3573 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3575 /* If we had a deferred signal to report, dequeue one now.
3576 This can happen if LWP gets more than one signal while
3577 trying to get out of a jump pad. */
3579 && !lwp
->status_pending_p
3580 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3582 lwp
->status_pending_p
= 1;
3585 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3586 "leaving status pending.\n",
3587 WSTOPSIG (lwp
->status_pending
),
3595 /* No resume action for this thread. */
3601 /* find_inferior callback for linux_resume.
3602 Set *FLAG_P if this lwp has an interesting status pending. */
3605 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3607 struct thread_info
*thread
= (struct thread_info
*) entry
;
3608 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3610 /* LWPs which will not be resumed are not interesting, because
3611 we might not wait for them next time through linux_wait. */
3612 if (lwp
->resume
== NULL
)
3615 if (lwp
->status_pending_p
)
3616 * (int *) flag_p
= 1;
3621 /* Return 1 if this lwp that GDB wants running is stopped at an
3622 internal breakpoint that we need to step over. It assumes that any
3623 required STOP_PC adjustment has already been propagated to the
3624 inferior's regcache. */
3627 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3629 struct thread_info
*thread
= (struct thread_info
*) entry
;
3630 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3631 struct thread_info
*saved_inferior
;
3634 /* LWPs which will not be resumed are not interesting, because we
3635 might not wait for them next time through linux_wait. */
3640 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3645 if (thread
->last_resume_kind
== resume_stop
)
3648 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3654 gdb_assert (lwp
->suspended
>= 0);
3659 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3664 if (!lwp
->need_step_over
)
3667 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3670 if (lwp
->status_pending_p
)
3673 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3679 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3683 /* If the PC has changed since we stopped, then don't do anything,
3684 and let the breakpoint/tracepoint be hit. This happens if, for
3685 instance, GDB handled the decr_pc_after_break subtraction itself,
3686 GDB is OOL stepping this thread, or the user has issued a "jump"
3687 command, or poked thread's registers herself. */
3688 if (pc
!= lwp
->stop_pc
)
3691 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3692 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3694 paddress (lwp
->stop_pc
), paddress (pc
));
3696 lwp
->need_step_over
= 0;
3700 saved_inferior
= current_inferior
;
3701 current_inferior
= thread
;
3703 /* We can only step over breakpoints we know about. */
3704 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3706 /* Don't step over a breakpoint that GDB expects to hit
3707 though. If the condition is being evaluated on the target's side
3708 and it evaluate to false, step over this breakpoint as well. */
3709 if (gdb_breakpoint_here (pc
)
3710 && gdb_condition_true_at_breakpoint (pc
)
3711 && gdb_no_commands_at_breakpoint (pc
))
3714 debug_printf ("Need step over [LWP %ld]? yes, but found"
3715 " GDB breakpoint at 0x%s; skipping step over\n",
3716 lwpid_of (thread
), paddress (pc
));
3718 current_inferior
= saved_inferior
;
3724 debug_printf ("Need step over [LWP %ld]? yes, "
3725 "found breakpoint at 0x%s\n",
3726 lwpid_of (thread
), paddress (pc
));
3728 /* We've found an lwp that needs stepping over --- return 1 so
3729 that find_inferior stops looking. */
3730 current_inferior
= saved_inferior
;
3732 /* If the step over is cancelled, this is set again. */
3733 lwp
->need_step_over
= 0;
3738 current_inferior
= saved_inferior
;
3741 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3743 lwpid_of (thread
), paddress (pc
));
3748 /* Start a step-over operation on LWP. When LWP stopped at a
3749 breakpoint, to make progress, we need to remove the breakpoint out
3750 of the way. If we let other threads run while we do that, they may
3751 pass by the breakpoint location and miss hitting it. To avoid
3752 that, a step-over momentarily stops all threads while LWP is
3753 single-stepped while the breakpoint is temporarily uninserted from
3754 the inferior. When the single-step finishes, we reinsert the
3755 breakpoint, and let all threads that are supposed to be running,
3758 On targets that don't support hardware single-step, we don't
3759 currently support full software single-stepping. Instead, we only
3760 support stepping over the thread event breakpoint, by asking the
3761 low target where to place a reinsert breakpoint. Since this
3762 routine assumes the breakpoint being stepped over is a thread event
3763 breakpoint, it usually assumes the return address of the current
3764 function is a good enough place to set the reinsert breakpoint. */
3767 start_step_over (struct lwp_info
*lwp
)
3769 struct thread_info
*thread
= get_lwp_thread (lwp
);
3770 struct thread_info
*saved_inferior
;
3775 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3778 stop_all_lwps (1, lwp
);
3779 gdb_assert (lwp
->suspended
== 0);
3782 debug_printf ("Done stopping all threads for step-over.\n");
3784 /* Note, we should always reach here with an already adjusted PC,
3785 either by GDB (if we're resuming due to GDB's request), or by our
3786 caller, if we just finished handling an internal breakpoint GDB
3787 shouldn't care about. */
3790 saved_inferior
= current_inferior
;
3791 current_inferior
= thread
;
3793 lwp
->bp_reinsert
= pc
;
3794 uninsert_breakpoints_at (pc
);
3795 uninsert_fast_tracepoint_jumps_at (pc
);
3797 if (can_hardware_single_step ())
3803 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3804 set_reinsert_breakpoint (raddr
);
3808 current_inferior
= saved_inferior
;
3810 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3812 /* Require next event from this LWP. */
3813 step_over_bkpt
= thread
->entry
.id
;
3817 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3818 start_step_over, if still there, and delete any reinsert
3819 breakpoints we've set, on non hardware single-step targets. */
3822 finish_step_over (struct lwp_info
*lwp
)
3824 if (lwp
->bp_reinsert
!= 0)
3827 debug_printf ("Finished step over.\n");
3829 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3830 may be no breakpoint to reinsert there by now. */
3831 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3832 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3834 lwp
->bp_reinsert
= 0;
3836 /* Delete any software-single-step reinsert breakpoints. No
3837 longer needed. We don't have to worry about other threads
3838 hitting this trap, and later not being able to explain it,
3839 because we were stepping over a breakpoint, and we hold all
3840 threads but LWP stopped while doing that. */
3841 if (!can_hardware_single_step ())
3842 delete_reinsert_breakpoints ();
3844 step_over_bkpt
= null_ptid
;
3851 /* This function is called once per thread. We check the thread's resume
3852 request, which will tell us whether to resume, step, or leave the thread
3853 stopped; and what signal, if any, it should be sent.
3855 For threads which we aren't explicitly told otherwise, we preserve
3856 the stepping flag; this is used for stepping over gdbserver-placed
3859 If pending_flags was set in any thread, we queue any needed
3860 signals, since we won't actually resume. We already have a pending
3861 event to report, so we don't need to preserve any step requests;
3862 they should be re-issued if necessary. */
3865 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3867 struct thread_info
*thread
= (struct thread_info
*) entry
;
3868 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3870 int leave_all_stopped
= * (int *) arg
;
3873 if (lwp
->resume
== NULL
)
3876 if (lwp
->resume
->kind
== resume_stop
)
3879 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3884 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3886 /* Stop the thread, and wait for the event asynchronously,
3887 through the event loop. */
3893 debug_printf ("already stopped LWP %ld\n",
3896 /* The LWP may have been stopped in an internal event that
3897 was not meant to be notified back to GDB (e.g., gdbserver
3898 breakpoint), so we should be reporting a stop event in
3901 /* If the thread already has a pending SIGSTOP, this is a
3902 no-op. Otherwise, something later will presumably resume
3903 the thread and this will cause it to cancel any pending
3904 operation, due to last_resume_kind == resume_stop. If
3905 the thread already has a pending status to report, we
3906 will still report it the next time we wait - see
3907 status_pending_p_callback. */
3909 /* If we already have a pending signal to report, then
3910 there's no need to queue a SIGSTOP, as this means we're
3911 midway through moving the LWP out of the jumppad, and we
3912 will report the pending signal as soon as that is
3914 if (lwp
->pending_signals_to_report
== NULL
)
3918 /* For stop requests, we're done. */
3920 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3924 /* If this thread which is about to be resumed has a pending status,
3925 then don't resume any threads - we can just report the pending
3926 status. Make sure to queue any signals that would otherwise be
3927 sent. In all-stop mode, we do this decision based on if *any*
3928 thread has a pending status. If there's a thread that needs the
3929 step-over-breakpoint dance, then don't resume any other thread
3930 but that particular one. */
3931 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3936 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3938 step
= (lwp
->resume
->kind
== resume_step
);
3939 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3944 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3946 /* If we have a new signal, enqueue the signal. */
3947 if (lwp
->resume
->sig
!= 0)
3949 struct pending_signals
*p_sig
;
3950 p_sig
= xmalloc (sizeof (*p_sig
));
3951 p_sig
->prev
= lwp
->pending_signals
;
3952 p_sig
->signal
= lwp
->resume
->sig
;
3953 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3955 /* If this is the same signal we were previously stopped by,
3956 make sure to queue its siginfo. We can ignore the return
3957 value of ptrace; if it fails, we'll skip
3958 PTRACE_SETSIGINFO. */
3959 if (WIFSTOPPED (lwp
->last_status
)
3960 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3961 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3964 lwp
->pending_signals
= p_sig
;
3968 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3974 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3976 struct thread_resume_array array
= { resume_info
, n
};
3977 struct thread_info
*need_step_over
= NULL
;
3979 int leave_all_stopped
;
3984 debug_printf ("linux_resume:\n");
3987 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3989 /* If there is a thread which would otherwise be resumed, which has
3990 a pending status, then don't resume any threads - we can just
3991 report the pending status. Make sure to queue any signals that
3992 would otherwise be sent. In non-stop mode, we'll apply this
3993 logic to each thread individually. We consume all pending events
3994 before considering to start a step-over (in all-stop). */
3997 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3999 /* If there is a thread which would otherwise be resumed, which is
4000 stopped at a breakpoint that needs stepping over, then don't
4001 resume any threads - have it step over the breakpoint with all
4002 other threads stopped, then resume all threads again. Make sure
4003 to queue any signals that would otherwise be delivered or
4005 if (!any_pending
&& supports_breakpoints ())
4007 = (struct thread_info
*) find_inferior (&all_threads
,
4008 need_step_over_p
, NULL
);
4010 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4014 if (need_step_over
!= NULL
)
4015 debug_printf ("Not resuming all, need step over\n");
4016 else if (any_pending
)
4017 debug_printf ("Not resuming, all-stop and found "
4018 "an LWP with pending status\n");
4020 debug_printf ("Resuming, no pending status or step over needed\n");
4023 /* Even if we're leaving threads stopped, queue all signals we'd
4024 otherwise deliver. */
4025 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4028 start_step_over (get_thread_lwp (need_step_over
));
4032 debug_printf ("linux_resume done\n");
4037 /* This function is called once per thread. We check the thread's
4038 last resume request, which will tell us whether to resume, step, or
4039 leave the thread stopped. Any signal the client requested to be
4040 delivered has already been enqueued at this point.
4042 If any thread that GDB wants running is stopped at an internal
4043 breakpoint that needs stepping over, we start a step-over operation
4044 on that particular thread, and leave all others stopped. */
4047 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4049 struct thread_info
*thread
= (struct thread_info
*) entry
;
4050 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4057 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4062 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4066 if (thread
->last_resume_kind
== resume_stop
4067 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4070 debug_printf (" client wants LWP to remain %ld stopped\n",
4075 if (lwp
->status_pending_p
)
4078 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4083 gdb_assert (lwp
->suspended
>= 0);
4088 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4092 if (thread
->last_resume_kind
== resume_stop
4093 && lwp
->pending_signals_to_report
== NULL
4094 && lwp
->collecting_fast_tracepoint
== 0)
4096 /* We haven't reported this LWP as stopped yet (otherwise, the
4097 last_status.kind check above would catch it, and we wouldn't
4098 reach here. This LWP may have been momentarily paused by a
4099 stop_all_lwps call while handling for example, another LWP's
4100 step-over. In that case, the pending expected SIGSTOP signal
4101 that was queued at vCont;t handling time will have already
4102 been consumed by wait_for_sigstop, and so we need to requeue
4103 another one here. Note that if the LWP already has a SIGSTOP
4104 pending, this is a no-op. */
4107 debug_printf ("Client wants LWP %ld to stop. "
4108 "Making sure it has a SIGSTOP pending\n",
4114 step
= thread
->last_resume_kind
== resume_step
;
4115 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4120 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4122 struct thread_info
*thread
= (struct thread_info
*) entry
;
4123 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4129 gdb_assert (lwp
->suspended
>= 0);
4131 return proceed_one_lwp (entry
, except
);
4134 /* When we finish a step-over, set threads running again. If there's
4135 another thread that may need a step-over, now's the time to start
4136 it. Eventually, we'll move all threads past their breakpoints. */
4139 proceed_all_lwps (void)
4141 struct thread_info
*need_step_over
;
4143 /* If there is a thread which would otherwise be resumed, which is
4144 stopped at a breakpoint that needs stepping over, then don't
4145 resume any threads - have it step over the breakpoint with all
4146 other threads stopped, then resume all threads again. */
4148 if (supports_breakpoints ())
4151 = (struct thread_info
*) find_inferior (&all_threads
,
4152 need_step_over_p
, NULL
);
4154 if (need_step_over
!= NULL
)
4157 debug_printf ("proceed_all_lwps: found "
4158 "thread %ld needing a step-over\n",
4159 lwpid_of (need_step_over
));
4161 start_step_over (get_thread_lwp (need_step_over
));
4167 debug_printf ("Proceeding, no step-over needed\n");
4169 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4172 /* Stopped LWPs that the client wanted to be running, that don't have
4173 pending statuses, are set to run again, except for EXCEPT, if not
4174 NULL. This undoes a stop_all_lwps call. */
4177 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4183 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4184 lwpid_of (get_lwp_thread (except
)));
4186 debug_printf ("unstopping all lwps\n");
4190 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4192 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4196 debug_printf ("unstop_all_lwps done\n");
4202 #ifdef HAVE_LINUX_REGSETS
4204 #define use_linux_regsets 1
4206 /* Returns true if REGSET has been disabled. */
4209 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4211 return (info
->disabled_regsets
!= NULL
4212 && info
->disabled_regsets
[regset
- info
->regsets
]);
4215 /* Disable REGSET. */
4218 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4222 dr_offset
= regset
- info
->regsets
;
4223 if (info
->disabled_regsets
== NULL
)
4224 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4225 info
->disabled_regsets
[dr_offset
] = 1;
4229 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4230 struct regcache
*regcache
)
4232 struct regset_info
*regset
;
4233 int saw_general_regs
= 0;
4237 regset
= regsets_info
->regsets
;
4239 pid
= lwpid_of (current_inferior
);
4240 while (regset
->size
>= 0)
4245 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4251 buf
= xmalloc (regset
->size
);
4253 nt_type
= regset
->nt_type
;
4257 iov
.iov_len
= regset
->size
;
4258 data
= (void *) &iov
;
4264 res
= ptrace (regset
->get_request
, pid
,
4265 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4267 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4273 /* If we get EIO on a regset, do not try it again for
4274 this process mode. */
4275 disable_regset (regsets_info
, regset
);
4282 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4287 else if (regset
->type
== GENERAL_REGS
)
4288 saw_general_regs
= 1;
4289 regset
->store_function (regcache
, buf
);
4293 if (saw_general_regs
)
4300 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4301 struct regcache
*regcache
)
4303 struct regset_info
*regset
;
4304 int saw_general_regs
= 0;
4308 regset
= regsets_info
->regsets
;
4310 pid
= lwpid_of (current_inferior
);
4311 while (regset
->size
>= 0)
4316 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4322 buf
= xmalloc (regset
->size
);
4324 /* First fill the buffer with the current register set contents,
4325 in case there are any items in the kernel's regset that are
4326 not in gdbserver's regcache. */
4328 nt_type
= regset
->nt_type
;
4332 iov
.iov_len
= regset
->size
;
4333 data
= (void *) &iov
;
4339 res
= ptrace (regset
->get_request
, pid
,
4340 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4342 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4347 /* Then overlay our cached registers on that. */
4348 regset
->fill_function (regcache
, buf
);
4350 /* Only now do we write the register set. */
4352 res
= ptrace (regset
->set_request
, pid
,
4353 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4355 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4363 /* If we get EIO on a regset, do not try it again for
4364 this process mode. */
4365 disable_regset (regsets_info
, regset
);
4369 else if (errno
== ESRCH
)
4371 /* At this point, ESRCH should mean the process is
4372 already gone, in which case we simply ignore attempts
4373 to change its registers. See also the related
4374 comment in linux_resume_one_lwp. */
4380 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4383 else if (regset
->type
== GENERAL_REGS
)
4384 saw_general_regs
= 1;
4388 if (saw_general_regs
)
4394 #else /* !HAVE_LINUX_REGSETS */
4396 #define use_linux_regsets 0
4397 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4398 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4402 /* Return 1 if register REGNO is supported by one of the regset ptrace
4403 calls or 0 if it has to be transferred individually. */
4406 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4408 unsigned char mask
= 1 << (regno
% 8);
4409 size_t index
= regno
/ 8;
4411 return (use_linux_regsets
4412 && (regs_info
->regset_bitmap
== NULL
4413 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4416 #ifdef HAVE_LINUX_USRREGS
4419 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4423 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4424 error ("Invalid register number %d.", regnum
);
4426 addr
= usrregs
->regmap
[regnum
];
4431 /* Fetch one register. */
4433 fetch_register (const struct usrregs_info
*usrregs
,
4434 struct regcache
*regcache
, int regno
)
4441 if (regno
>= usrregs
->num_regs
)
4443 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4446 regaddr
= register_addr (usrregs
, regno
);
4450 size
= ((register_size (regcache
->tdesc
, regno
)
4451 + sizeof (PTRACE_XFER_TYPE
) - 1)
4452 & -sizeof (PTRACE_XFER_TYPE
));
4453 buf
= alloca (size
);
4455 pid
= lwpid_of (current_inferior
);
4456 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4459 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4460 ptrace (PTRACE_PEEKUSER
, pid
,
4461 /* Coerce to a uintptr_t first to avoid potential gcc warning
4462 of coercing an 8 byte integer to a 4 byte pointer. */
4463 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4464 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4466 error ("reading register %d: %s", regno
, strerror (errno
));
4469 if (the_low_target
.supply_ptrace_register
)
4470 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4472 supply_register (regcache
, regno
, buf
);
4475 /* Store one register. */
4477 store_register (const struct usrregs_info
*usrregs
,
4478 struct regcache
*regcache
, int regno
)
4485 if (regno
>= usrregs
->num_regs
)
4487 if ((*the_low_target
.cannot_store_register
) (regno
))
4490 regaddr
= register_addr (usrregs
, regno
);
4494 size
= ((register_size (regcache
->tdesc
, regno
)
4495 + sizeof (PTRACE_XFER_TYPE
) - 1)
4496 & -sizeof (PTRACE_XFER_TYPE
));
4497 buf
= alloca (size
);
4498 memset (buf
, 0, size
);
4500 if (the_low_target
.collect_ptrace_register
)
4501 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4503 collect_register (regcache
, regno
, buf
);
4505 pid
= lwpid_of (current_inferior
);
4506 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4509 ptrace (PTRACE_POKEUSER
, pid
,
4510 /* Coerce to a uintptr_t first to avoid potential gcc warning
4511 about coercing an 8 byte integer to a 4 byte pointer. */
4512 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4513 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4516 /* At this point, ESRCH should mean the process is
4517 already gone, in which case we simply ignore attempts
4518 to change its registers. See also the related
4519 comment in linux_resume_one_lwp. */
4523 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4524 error ("writing register %d: %s", regno
, strerror (errno
));
4526 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4530 /* Fetch all registers, or just one, from the child process.
4531 If REGNO is -1, do this for all registers, skipping any that are
4532 assumed to have been retrieved by regsets_fetch_inferior_registers,
4533 unless ALL is non-zero.
4534 Otherwise, REGNO specifies which register (so we can save time). */
4536 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4537 struct regcache
*regcache
, int regno
, int all
)
4539 struct usrregs_info
*usr
= regs_info
->usrregs
;
4543 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4544 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4545 fetch_register (usr
, regcache
, regno
);
4548 fetch_register (usr
, regcache
, regno
);
4551 /* Store our register values back into the inferior.
4552 If REGNO is -1, do this for all registers, skipping any that are
4553 assumed to have been saved by regsets_store_inferior_registers,
4554 unless ALL is non-zero.
4555 Otherwise, REGNO specifies which register (so we can save time). */
4557 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4558 struct regcache
*regcache
, int regno
, int all
)
4560 struct usrregs_info
*usr
= regs_info
->usrregs
;
4564 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4565 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4566 store_register (usr
, regcache
, regno
);
4569 store_register (usr
, regcache
, regno
);
4572 #else /* !HAVE_LINUX_USRREGS */
4574 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4575 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4581 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4585 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4589 if (the_low_target
.fetch_register
!= NULL
4590 && regs_info
->usrregs
!= NULL
)
4591 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4592 (*the_low_target
.fetch_register
) (regcache
, regno
);
4594 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4595 if (regs_info
->usrregs
!= NULL
)
4596 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4600 if (the_low_target
.fetch_register
!= NULL
4601 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4604 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4606 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4608 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4609 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4614 linux_store_registers (struct regcache
*regcache
, int regno
)
4618 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4622 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4624 if (regs_info
->usrregs
!= NULL
)
4625 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4629 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4631 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4633 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4634 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4639 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4640 to debugger memory starting at MYADDR. */
4643 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4645 int pid
= lwpid_of (current_inferior
);
4646 register PTRACE_XFER_TYPE
*buffer
;
4647 register CORE_ADDR addr
;
4654 /* Try using /proc. Don't bother for one word. */
4655 if (len
>= 3 * sizeof (long))
4659 /* We could keep this file open and cache it - possibly one per
4660 thread. That requires some juggling, but is even faster. */
4661 sprintf (filename
, "/proc/%d/mem", pid
);
4662 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4666 /* If pread64 is available, use it. It's faster if the kernel
4667 supports it (only one syscall), and it's 64-bit safe even on
4668 32-bit platforms (for instance, SPARC debugging a SPARC64
4671 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4674 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4675 bytes
= read (fd
, myaddr
, len
);
4682 /* Some data was read, we'll try to get the rest with ptrace. */
4692 /* Round starting address down to longword boundary. */
4693 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4694 /* Round ending address up; get number of longwords that makes. */
4695 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4696 / sizeof (PTRACE_XFER_TYPE
));
4697 /* Allocate buffer of that many longwords. */
4698 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4700 /* Read all the longwords */
4702 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4704 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4705 about coercing an 8 byte integer to a 4 byte pointer. */
4706 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4707 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4708 (PTRACE_TYPE_ARG4
) 0);
4714 /* Copy appropriate bytes out of the buffer. */
4717 i
*= sizeof (PTRACE_XFER_TYPE
);
4718 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4720 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4727 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4728 memory at MEMADDR. On failure (cannot write to the inferior)
4729 returns the value of errno. Always succeeds if LEN is zero. */
4732 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4735 /* Round starting address down to longword boundary. */
4736 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4737 /* Round ending address up; get number of longwords that makes. */
4739 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4740 / sizeof (PTRACE_XFER_TYPE
);
4742 /* Allocate buffer of that many longwords. */
4743 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4744 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4746 int pid
= lwpid_of (current_inferior
);
4750 /* Zero length write always succeeds. */
4756 /* Dump up to four bytes. */
4757 unsigned int val
= * (unsigned int *) myaddr
;
4763 val
= val
& 0xffffff;
4764 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4765 val
, (long)memaddr
);
4768 /* Fill start and end extra bytes of buffer with existing memory data. */
4771 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4772 about coercing an 8 byte integer to a 4 byte pointer. */
4773 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4774 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4775 (PTRACE_TYPE_ARG4
) 0);
4783 = ptrace (PTRACE_PEEKTEXT
, pid
,
4784 /* Coerce to a uintptr_t first to avoid potential gcc warning
4785 about coercing an 8 byte integer to a 4 byte pointer. */
4786 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4787 * sizeof (PTRACE_XFER_TYPE
)),
4788 (PTRACE_TYPE_ARG4
) 0);
4793 /* Copy data to be written over corresponding part of buffer. */
4795 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4798 /* Write the entire buffer. */
4800 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4803 ptrace (PTRACE_POKETEXT
, pid
,
4804 /* Coerce to a uintptr_t first to avoid potential gcc warning
4805 about coercing an 8 byte integer to a 4 byte pointer. */
4806 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4807 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4816 linux_look_up_symbols (void)
4818 #ifdef USE_THREAD_DB
4819 struct process_info
*proc
= current_process ();
4821 if (proc
->private->thread_db
!= NULL
)
4824 /* If the kernel supports tracing clones, then we don't need to
4825 use the magic thread event breakpoint to learn about
4827 thread_db_init (!linux_supports_traceclone ());
4832 linux_request_interrupt (void)
4834 extern unsigned long signal_pid
;
4836 if (!ptid_equal (cont_thread
, null_ptid
)
4837 && !ptid_equal (cont_thread
, minus_one_ptid
))
4841 lwpid
= lwpid_of (current_inferior
);
4842 kill_lwp (lwpid
, SIGINT
);
4845 kill_lwp (signal_pid
, SIGINT
);
4848 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4849 to debugger memory starting at MYADDR. */
4852 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4854 char filename
[PATH_MAX
];
4856 int pid
= lwpid_of (current_inferior
);
4858 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4860 fd
= open (filename
, O_RDONLY
);
4864 if (offset
!= (CORE_ADDR
) 0
4865 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4868 n
= read (fd
, myaddr
, len
);
4875 /* These breakpoint and watchpoint related wrapper functions simply
4876 pass on the function call if the target has registered a
4877 corresponding function. */
4880 linux_supports_z_point_type (char z_type
)
4882 return (the_low_target
.supports_z_point_type
!= NULL
4883 && the_low_target
.supports_z_point_type (z_type
));
4887 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4888 int size
, struct raw_breakpoint
*bp
)
4890 if (the_low_target
.insert_point
!= NULL
)
4891 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4893 /* Unsupported (see target.h). */
4898 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4899 int size
, struct raw_breakpoint
*bp
)
4901 if (the_low_target
.remove_point
!= NULL
)
4902 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4904 /* Unsupported (see target.h). */
4909 linux_stopped_by_watchpoint (void)
4911 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4913 return lwp
->stopped_by_watchpoint
;
4917 linux_stopped_data_address (void)
4919 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4921 return lwp
->stopped_data_address
;
4924 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4925 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4926 && defined(PT_TEXT_END_ADDR)
4928 /* This is only used for targets that define PT_TEXT_ADDR,
4929 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4930 the target has different ways of acquiring this information, like
4933 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4934 to tell gdb about. */
4937 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4939 unsigned long text
, text_end
, data
;
4940 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4944 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4945 (PTRACE_TYPE_ARG4
) 0);
4946 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4947 (PTRACE_TYPE_ARG4
) 0);
4948 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4949 (PTRACE_TYPE_ARG4
) 0);
4953 /* Both text and data offsets produced at compile-time (and so
4954 used by gdb) are relative to the beginning of the program,
4955 with the data segment immediately following the text segment.
4956 However, the actual runtime layout in memory may put the data
4957 somewhere else, so when we send gdb a data base-address, we
4958 use the real data base address and subtract the compile-time
4959 data base-address from it (which is just the length of the
4960 text segment). BSS immediately follows data in both
4963 *data_p
= data
- (text_end
- text
);
4972 linux_qxfer_osdata (const char *annex
,
4973 unsigned char *readbuf
, unsigned const char *writebuf
,
4974 CORE_ADDR offset
, int len
)
4976 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4979 /* Convert a native/host siginfo object, into/from the siginfo in the
4980 layout of the inferiors' architecture. */
4983 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4987 if (the_low_target
.siginfo_fixup
!= NULL
)
4988 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4990 /* If there was no callback, or the callback didn't do anything,
4991 then just do a straight memcpy. */
4995 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4997 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5002 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5003 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5007 char inf_siginfo
[sizeof (siginfo_t
)];
5009 if (current_inferior
== NULL
)
5012 pid
= lwpid_of (current_inferior
);
5015 debug_printf ("%s siginfo for lwp %d.\n",
5016 readbuf
!= NULL
? "Reading" : "Writing",
5019 if (offset
>= sizeof (siginfo
))
5022 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5025 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5026 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5027 inferior with a 64-bit GDBSERVER should look the same as debugging it
5028 with a 32-bit GDBSERVER, we need to convert it. */
5029 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5031 if (offset
+ len
> sizeof (siginfo
))
5032 len
= sizeof (siginfo
) - offset
;
5034 if (readbuf
!= NULL
)
5035 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5038 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5040 /* Convert back to ptrace layout before flushing it out. */
5041 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5043 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5050 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5051 so we notice when children change state; as the handler for the
5052 sigsuspend in my_waitpid. */
5055 sigchld_handler (int signo
)
5057 int old_errno
= errno
;
5063 /* fprintf is not async-signal-safe, so call write
5065 if (write (2, "sigchld_handler\n",
5066 sizeof ("sigchld_handler\n") - 1) < 0)
5067 break; /* just ignore */
5071 if (target_is_async_p ())
5072 async_file_mark (); /* trigger a linux_wait */
5078 linux_supports_non_stop (void)
5084 linux_async (int enable
)
5086 int previous
= target_is_async_p ();
5089 debug_printf ("linux_async (%d), previous=%d\n",
5092 if (previous
!= enable
)
5095 sigemptyset (&mask
);
5096 sigaddset (&mask
, SIGCHLD
);
5098 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5102 if (pipe (linux_event_pipe
) == -1)
5103 fatal ("creating event pipe failed.");
5105 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5106 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5108 /* Register the event loop handler. */
5109 add_file_handler (linux_event_pipe
[0],
5110 handle_target_event
, NULL
);
5112 /* Always trigger a linux_wait. */
5117 delete_file_handler (linux_event_pipe
[0]);
5119 close (linux_event_pipe
[0]);
5120 close (linux_event_pipe
[1]);
5121 linux_event_pipe
[0] = -1;
5122 linux_event_pipe
[1] = -1;
5125 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5132 linux_start_non_stop (int nonstop
)
5134 /* Register or unregister from event-loop accordingly. */
5135 linux_async (nonstop
);
5140 linux_supports_multi_process (void)
5146 linux_supports_disable_randomization (void)
5148 #ifdef HAVE_PERSONALITY
5156 linux_supports_agent (void)
5162 linux_supports_range_stepping (void)
5164 if (*the_low_target
.supports_range_stepping
== NULL
)
5167 return (*the_low_target
.supports_range_stepping
) ();
5170 /* Enumerate spufs IDs for process PID. */
5172 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5178 struct dirent
*entry
;
5180 sprintf (path
, "/proc/%ld/fd", pid
);
5181 dir
= opendir (path
);
5186 while ((entry
= readdir (dir
)) != NULL
)
5192 fd
= atoi (entry
->d_name
);
5196 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5197 if (stat (path
, &st
) != 0)
5199 if (!S_ISDIR (st
.st_mode
))
5202 if (statfs (path
, &stfs
) != 0)
5204 if (stfs
.f_type
!= SPUFS_MAGIC
)
5207 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5209 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5219 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5220 object type, using the /proc file system. */
5222 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5223 unsigned const char *writebuf
,
5224 CORE_ADDR offset
, int len
)
5226 long pid
= lwpid_of (current_inferior
);
5231 if (!writebuf
&& !readbuf
)
5239 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5242 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5243 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5248 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5255 ret
= write (fd
, writebuf
, (size_t) len
);
5257 ret
= read (fd
, readbuf
, (size_t) len
);
5263 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5264 struct target_loadseg
5266 /* Core address to which the segment is mapped. */
5268 /* VMA recorded in the program header. */
5270 /* Size of this segment in memory. */
5274 # if defined PT_GETDSBT
5275 struct target_loadmap
5277 /* Protocol version number, must be zero. */
5279 /* Pointer to the DSBT table, its size, and the DSBT index. */
5280 unsigned *dsbt_table
;
5281 unsigned dsbt_size
, dsbt_index
;
5282 /* Number of segments in this map. */
5284 /* The actual memory map. */
5285 struct target_loadseg segs
[/*nsegs*/];
5287 # define LINUX_LOADMAP PT_GETDSBT
5288 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5289 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5291 struct target_loadmap
5293 /* Protocol version number, must be zero. */
5295 /* Number of segments in this map. */
5297 /* The actual memory map. */
5298 struct target_loadseg segs
[/*nsegs*/];
5300 # define LINUX_LOADMAP PTRACE_GETFDPIC
5301 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5302 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5306 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5307 unsigned char *myaddr
, unsigned int len
)
5309 int pid
= lwpid_of (current_inferior
);
5311 struct target_loadmap
*data
= NULL
;
5312 unsigned int actual_length
, copy_length
;
5314 if (strcmp (annex
, "exec") == 0)
5315 addr
= (int) LINUX_LOADMAP_EXEC
;
5316 else if (strcmp (annex
, "interp") == 0)
5317 addr
= (int) LINUX_LOADMAP_INTERP
;
5321 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5327 actual_length
= sizeof (struct target_loadmap
)
5328 + sizeof (struct target_loadseg
) * data
->nsegs
;
5330 if (offset
< 0 || offset
> actual_length
)
5333 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5334 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5338 # define linux_read_loadmap NULL
5339 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5342 linux_process_qsupported (const char *query
)
5344 if (the_low_target
.process_qsupported
!= NULL
)
5345 the_low_target
.process_qsupported (query
);
5349 linux_supports_tracepoints (void)
5351 if (*the_low_target
.supports_tracepoints
== NULL
)
5354 return (*the_low_target
.supports_tracepoints
) ();
5358 linux_read_pc (struct regcache
*regcache
)
5360 if (the_low_target
.get_pc
== NULL
)
5363 return (*the_low_target
.get_pc
) (regcache
);
5367 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5369 gdb_assert (the_low_target
.set_pc
!= NULL
);
5371 (*the_low_target
.set_pc
) (regcache
, pc
);
5375 linux_thread_stopped (struct thread_info
*thread
)
5377 return get_thread_lwp (thread
)->stopped
;
5380 /* This exposes stop-all-threads functionality to other modules. */
5383 linux_pause_all (int freeze
)
5385 stop_all_lwps (freeze
, NULL
);
5388 /* This exposes unstop-all-threads functionality to other gdbserver
5392 linux_unpause_all (int unfreeze
)
5394 unstop_all_lwps (unfreeze
, NULL
);
5398 linux_prepare_to_access_memory (void)
5400 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5403 linux_pause_all (1);
5408 linux_done_accessing_memory (void)
5410 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5413 linux_unpause_all (1);
5417 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5418 CORE_ADDR collector
,
5421 CORE_ADDR
*jump_entry
,
5422 CORE_ADDR
*trampoline
,
5423 ULONGEST
*trampoline_size
,
5424 unsigned char *jjump_pad_insn
,
5425 ULONGEST
*jjump_pad_insn_size
,
5426 CORE_ADDR
*adjusted_insn_addr
,
5427 CORE_ADDR
*adjusted_insn_addr_end
,
5430 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5431 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5432 jump_entry
, trampoline
, trampoline_size
,
5433 jjump_pad_insn
, jjump_pad_insn_size
,
5434 adjusted_insn_addr
, adjusted_insn_addr_end
,
5438 static struct emit_ops
*
5439 linux_emit_ops (void)
5441 if (the_low_target
.emit_ops
!= NULL
)
5442 return (*the_low_target
.emit_ops
) ();
5448 linux_get_min_fast_tracepoint_insn_len (void)
5450 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5453 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5456 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5457 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5459 char filename
[PATH_MAX
];
5461 const int auxv_size
= is_elf64
5462 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5463 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5465 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5467 fd
= open (filename
, O_RDONLY
);
5473 while (read (fd
, buf
, auxv_size
) == auxv_size
5474 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5478 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5480 switch (aux
->a_type
)
5483 *phdr_memaddr
= aux
->a_un
.a_val
;
5486 *num_phdr
= aux
->a_un
.a_val
;
5492 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5494 switch (aux
->a_type
)
5497 *phdr_memaddr
= aux
->a_un
.a_val
;
5500 *num_phdr
= aux
->a_un
.a_val
;
5508 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5510 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5511 "phdr_memaddr = %ld, phdr_num = %d",
5512 (long) *phdr_memaddr
, *num_phdr
);
5519 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5522 get_dynamic (const int pid
, const int is_elf64
)
5524 CORE_ADDR phdr_memaddr
, relocation
;
5526 unsigned char *phdr_buf
;
5527 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5529 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5532 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5533 phdr_buf
= alloca (num_phdr
* phdr_size
);
5535 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5538 /* Compute relocation: it is expected to be 0 for "regular" executables,
5539 non-zero for PIE ones. */
5541 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5544 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5546 if (p
->p_type
== PT_PHDR
)
5547 relocation
= phdr_memaddr
- p
->p_vaddr
;
5551 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5553 if (p
->p_type
== PT_PHDR
)
5554 relocation
= phdr_memaddr
- p
->p_vaddr
;
5557 if (relocation
== -1)
5559 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5560 any real world executables, including PIE executables, have always
5561 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5562 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5563 or present DT_DEBUG anyway (fpc binaries are statically linked).
5565 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5567 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5572 for (i
= 0; i
< num_phdr
; i
++)
5576 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5578 if (p
->p_type
== PT_DYNAMIC
)
5579 return p
->p_vaddr
+ relocation
;
5583 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5585 if (p
->p_type
== PT_DYNAMIC
)
5586 return p
->p_vaddr
+ relocation
;
5593 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5594 can be 0 if the inferior does not yet have the library list initialized.
5595 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5596 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5599 get_r_debug (const int pid
, const int is_elf64
)
5601 CORE_ADDR dynamic_memaddr
;
5602 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5603 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5606 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5607 if (dynamic_memaddr
== 0)
5610 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5614 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5615 #ifdef DT_MIPS_RLD_MAP
5619 unsigned char buf
[sizeof (Elf64_Xword
)];
5623 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5625 if (linux_read_memory (dyn
->d_un
.d_val
,
5626 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5631 #endif /* DT_MIPS_RLD_MAP */
5633 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5634 map
= dyn
->d_un
.d_val
;
5636 if (dyn
->d_tag
== DT_NULL
)
5641 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5642 #ifdef DT_MIPS_RLD_MAP
5646 unsigned char buf
[sizeof (Elf32_Word
)];
5650 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5652 if (linux_read_memory (dyn
->d_un
.d_val
,
5653 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5658 #endif /* DT_MIPS_RLD_MAP */
5660 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5661 map
= dyn
->d_un
.d_val
;
5663 if (dyn
->d_tag
== DT_NULL
)
5667 dynamic_memaddr
+= dyn_size
;
5673 /* Read one pointer from MEMADDR in the inferior. */
5676 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5680 /* Go through a union so this works on either big or little endian
5681 hosts, when the inferior's pointer size is smaller than the size
5682 of CORE_ADDR. It is assumed the inferior's endianness is the
5683 same of the superior's. */
5686 CORE_ADDR core_addr
;
5691 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5694 if (ptr_size
== sizeof (CORE_ADDR
))
5695 *ptr
= addr
.core_addr
;
5696 else if (ptr_size
== sizeof (unsigned int))
5699 gdb_assert_not_reached ("unhandled pointer size");
5704 struct link_map_offsets
5706 /* Offset and size of r_debug.r_version. */
5707 int r_version_offset
;
5709 /* Offset and size of r_debug.r_map. */
5712 /* Offset to l_addr field in struct link_map. */
5715 /* Offset to l_name field in struct link_map. */
5718 /* Offset to l_ld field in struct link_map. */
5721 /* Offset to l_next field in struct link_map. */
5724 /* Offset to l_prev field in struct link_map. */
5728 /* Construct qXfer:libraries-svr4:read reply. */
5731 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5732 unsigned const char *writebuf
,
5733 CORE_ADDR offset
, int len
)
5736 unsigned document_len
;
5737 struct process_info_private
*const priv
= current_process ()->private;
5738 char filename
[PATH_MAX
];
5741 static const struct link_map_offsets lmo_32bit_offsets
=
5743 0, /* r_version offset. */
5744 4, /* r_debug.r_map offset. */
5745 0, /* l_addr offset in link_map. */
5746 4, /* l_name offset in link_map. */
5747 8, /* l_ld offset in link_map. */
5748 12, /* l_next offset in link_map. */
5749 16 /* l_prev offset in link_map. */
5752 static const struct link_map_offsets lmo_64bit_offsets
=
5754 0, /* r_version offset. */
5755 8, /* r_debug.r_map offset. */
5756 0, /* l_addr offset in link_map. */
5757 8, /* l_name offset in link_map. */
5758 16, /* l_ld offset in link_map. */
5759 24, /* l_next offset in link_map. */
5760 32 /* l_prev offset in link_map. */
5762 const struct link_map_offsets
*lmo
;
5763 unsigned int machine
;
5765 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5766 int allocated
= 1024;
5768 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5769 int header_done
= 0;
5771 if (writebuf
!= NULL
)
5773 if (readbuf
== NULL
)
5776 pid
= lwpid_of (current_inferior
);
5777 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5778 is_elf64
= elf_64_file_p (filename
, &machine
);
5779 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5780 ptr_size
= is_elf64
? 8 : 4;
5782 while (annex
[0] != '\0')
5788 sep
= strchr (annex
, '=');
5793 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5795 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5799 annex
= strchr (sep
, ';');
5806 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5813 if (priv
->r_debug
== 0)
5814 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5816 /* We failed to find DT_DEBUG. Such situation will not change
5817 for this inferior - do not retry it. Report it to GDB as
5818 E01, see for the reasons at the GDB solib-svr4.c side. */
5819 if (priv
->r_debug
== (CORE_ADDR
) -1)
5822 if (priv
->r_debug
!= 0)
5824 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5825 (unsigned char *) &r_version
,
5826 sizeof (r_version
)) != 0
5829 warning ("unexpected r_debug version %d", r_version
);
5831 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5832 &lm_addr
, ptr_size
) != 0)
5834 warning ("unable to read r_map from 0x%lx",
5835 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5840 document
= xmalloc (allocated
);
5841 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5842 p
= document
+ strlen (document
);
5845 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5846 &l_name
, ptr_size
) == 0
5847 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5848 &l_addr
, ptr_size
) == 0
5849 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5850 &l_ld
, ptr_size
) == 0
5851 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5852 &l_prev
, ptr_size
) == 0
5853 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5854 &l_next
, ptr_size
) == 0)
5856 unsigned char libname
[PATH_MAX
];
5858 if (lm_prev
!= l_prev
)
5860 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5861 (long) lm_prev
, (long) l_prev
);
5865 /* Ignore the first entry even if it has valid name as the first entry
5866 corresponds to the main executable. The first entry should not be
5867 skipped if the dynamic loader was loaded late by a static executable
5868 (see solib-svr4.c parameter ignore_first). But in such case the main
5869 executable does not have PT_DYNAMIC present and this function already
5870 exited above due to failed get_r_debug. */
5873 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5878 /* Not checking for error because reading may stop before
5879 we've got PATH_MAX worth of characters. */
5881 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5882 libname
[sizeof (libname
) - 1] = '\0';
5883 if (libname
[0] != '\0')
5885 /* 6x the size for xml_escape_text below. */
5886 size_t len
= 6 * strlen ((char *) libname
);
5891 /* Terminate `<library-list-svr4'. */
5896 while (allocated
< p
- document
+ len
+ 200)
5898 /* Expand to guarantee sufficient storage. */
5899 uintptr_t document_len
= p
- document
;
5901 document
= xrealloc (document
, 2 * allocated
);
5903 p
= document
+ document_len
;
5906 name
= xml_escape_text ((char *) libname
);
5907 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5908 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5909 name
, (unsigned long) lm_addr
,
5910 (unsigned long) l_addr
, (unsigned long) l_ld
);
5921 /* Empty list; terminate `<library-list-svr4'. */
5925 strcpy (p
, "</library-list-svr4>");
5927 document_len
= strlen (document
);
5928 if (offset
< document_len
)
5929 document_len
-= offset
;
5932 if (len
> document_len
)
5935 memcpy (readbuf
, document
+ offset
, len
);
5941 #ifdef HAVE_LINUX_BTRACE
5943 /* See to_enable_btrace target method. */
5945 static struct btrace_target_info
*
5946 linux_low_enable_btrace (ptid_t ptid
)
5948 struct btrace_target_info
*tinfo
;
5950 tinfo
= linux_enable_btrace (ptid
);
5954 struct thread_info
*thread
= find_thread_ptid (ptid
);
5955 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5957 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5963 /* See to_disable_btrace target method. */
5966 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5968 enum btrace_error err
;
5970 err
= linux_disable_btrace (tinfo
);
5971 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5974 /* See to_read_btrace target method. */
5977 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5980 VEC (btrace_block_s
) *btrace
;
5981 struct btrace_block
*block
;
5982 enum btrace_error err
;
5986 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5987 if (err
!= BTRACE_ERR_NONE
)
5989 if (err
== BTRACE_ERR_OVERFLOW
)
5990 buffer_grow_str0 (buffer
, "E.Overflow.");
5992 buffer_grow_str0 (buffer
, "E.Generic Error.");
5997 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5998 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6000 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
6001 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6002 paddress (block
->begin
), paddress (block
->end
));
6004 buffer_grow_str0 (buffer
, "</btrace>\n");
6006 VEC_free (btrace_block_s
, btrace
);
6010 #endif /* HAVE_LINUX_BTRACE */
6012 static struct target_ops linux_target_ops
= {
6013 linux_create_inferior
,
6022 linux_fetch_registers
,
6023 linux_store_registers
,
6024 linux_prepare_to_access_memory
,
6025 linux_done_accessing_memory
,
6028 linux_look_up_symbols
,
6029 linux_request_interrupt
,
6031 linux_supports_z_point_type
,
6034 linux_stopped_by_watchpoint
,
6035 linux_stopped_data_address
,
6036 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6037 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6038 && defined(PT_TEXT_END_ADDR)
6043 #ifdef USE_THREAD_DB
6044 thread_db_get_tls_address
,
6049 hostio_last_error_from_errno
,
6052 linux_supports_non_stop
,
6054 linux_start_non_stop
,
6055 linux_supports_multi_process
,
6056 #ifdef USE_THREAD_DB
6057 thread_db_handle_monitor_command
,
6061 linux_common_core_of_thread
,
6063 linux_process_qsupported
,
6064 linux_supports_tracepoints
,
6067 linux_thread_stopped
,
6071 linux_cancel_breakpoints
,
6072 linux_stabilize_threads
,
6073 linux_install_fast_tracepoint_jump_pad
,
6075 linux_supports_disable_randomization
,
6076 linux_get_min_fast_tracepoint_insn_len
,
6077 linux_qxfer_libraries_svr4
,
6078 linux_supports_agent
,
6079 #ifdef HAVE_LINUX_BTRACE
6080 linux_supports_btrace
,
6081 linux_low_enable_btrace
,
6082 linux_low_disable_btrace
,
6083 linux_low_read_btrace
,
6090 linux_supports_range_stepping
,
6094 linux_init_signals ()
6096 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6097 to find what the cancel signal actually is. */
6098 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6099 signal (__SIGRTMIN
+1, SIG_IGN
);
6103 #ifdef HAVE_LINUX_REGSETS
6105 initialize_regsets_info (struct regsets_info
*info
)
6107 for (info
->num_regsets
= 0;
6108 info
->regsets
[info
->num_regsets
].size
>= 0;
6109 info
->num_regsets
++)
6115 initialize_low (void)
6117 struct sigaction sigchld_action
;
6118 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6119 set_target_ops (&linux_target_ops
);
6120 set_breakpoint_data (the_low_target
.breakpoint
,
6121 the_low_target
.breakpoint_len
);
6122 linux_init_signals ();
6123 linux_ptrace_init_warnings ();
6125 sigchld_action
.sa_handler
= sigchld_handler
;
6126 sigemptyset (&sigchld_action
.sa_mask
);
6127 sigchld_action
.sa_flags
= SA_RESTART
;
6128 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6130 initialize_low_arch ();