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>
35 #include <sys/syscall.h>
39 #include <sys/types.h>
44 #include "filestuff.h"
45 #include "tracepoint.h"
48 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
49 then ELFMAG0 will have been defined. If it didn't get included by
50 gdb_proc_service.h then including it will likely introduce a duplicate
51 definition of elf_fpregset_t. */
56 #define SPUFS_MAGIC 0x23c9b64e
59 #ifdef HAVE_PERSONALITY
60 # include <sys/personality.h>
61 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
62 # define ADDR_NO_RANDOMIZE 0x0040000
71 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
74 /* This is the kernel's hard limit. Not to be confused with
80 /* Some targets did not define these ptrace constants from the start,
81 so gdbserver defines them locally here. In the future, these may
82 be removed after they are added to asm/ptrace.h. */
83 #if !(defined(PT_TEXT_ADDR) \
84 || defined(PT_DATA_ADDR) \
85 || defined(PT_TEXT_END_ADDR))
86 #if defined(__mcoldfire__)
87 /* These are still undefined in 3.10 kernels. */
88 #define PT_TEXT_ADDR 49*4
89 #define PT_DATA_ADDR 50*4
90 #define PT_TEXT_END_ADDR 51*4
91 /* BFIN already defines these since at least 2.6.32 kernels. */
93 #define PT_TEXT_ADDR 220
94 #define PT_TEXT_END_ADDR 224
95 #define PT_DATA_ADDR 228
96 /* These are still undefined in 3.10 kernels. */
97 #elif defined(__TMS320C6X__)
98 #define PT_TEXT_ADDR (0x10000*4)
99 #define PT_DATA_ADDR (0x10004*4)
100 #define PT_TEXT_END_ADDR (0x10008*4)
104 #ifdef HAVE_LINUX_BTRACE
105 # include "nat/linux-btrace.h"
108 #ifndef HAVE_ELF32_AUXV_T
109 /* Copied from glibc's elf.h. */
112 uint32_t a_type
; /* Entry type */
115 uint32_t a_val
; /* Integer value */
116 /* We use to have pointer elements added here. We cannot do that,
117 though, since it does not work when using 32-bit definitions
118 on 64-bit platforms and vice versa. */
123 #ifndef HAVE_ELF64_AUXV_T
124 /* Copied from glibc's elf.h. */
127 uint64_t a_type
; /* Entry type */
130 uint64_t a_val
; /* Integer value */
131 /* We use to have pointer elements added here. We cannot do that,
132 though, since it does not work when using 32-bit definitions
133 on 64-bit platforms and vice versa. */
138 /* A list of all unknown processes which receive stop signals. Some
139 other process will presumably claim each of these as forked
140 children momentarily. */
142 struct simple_pid_list
144 /* The process ID. */
147 /* The status as reported by waitpid. */
151 struct simple_pid_list
*next
;
153 struct simple_pid_list
*stopped_pids
;
155 /* Trivial list manipulation functions to keep track of a list of new
156 stopped processes. */
159 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
161 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
164 new_pid
->status
= status
;
165 new_pid
->next
= *listp
;
170 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
172 struct simple_pid_list
**p
;
174 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
175 if ((*p
)->pid
== pid
)
177 struct simple_pid_list
*next
= (*p
)->next
;
179 *statusp
= (*p
)->status
;
187 enum stopping_threads_kind
189 /* Not stopping threads presently. */
190 NOT_STOPPING_THREADS
,
192 /* Stopping threads. */
195 /* Stopping and suspending threads. */
196 STOPPING_AND_SUSPENDING_THREADS
199 /* This is set while stop_all_lwps is in effect. */
200 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
202 /* FIXME make into a target method? */
203 int using_threads
= 1;
205 /* True if we're presently stabilizing threads (moving them out of
207 static int stabilizing_threads
;
209 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
210 int step
, int signal
, siginfo_t
*info
);
211 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
212 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
213 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
214 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
215 int *wstat
, int options
);
216 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
217 static struct lwp_info
*add_lwp (ptid_t ptid
);
218 static int linux_stopped_by_watchpoint (void);
219 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
220 static void proceed_all_lwps (void);
221 static int finish_step_over (struct lwp_info
*lwp
);
222 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
223 static int kill_lwp (unsigned long lwpid
, int signo
);
225 /* True if the low target can hardware single-step. Such targets
226 don't need a BREAKPOINT_REINSERT_ADDR callback. */
229 can_hardware_single_step (void)
231 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
234 /* True if the low target supports memory breakpoints. If so, we'll
235 have a GET_PC implementation. */
238 supports_breakpoints (void)
240 return (the_low_target
.get_pc
!= NULL
);
243 /* Returns true if this target can support fast tracepoints. This
244 does not mean that the in-process agent has been loaded in the
248 supports_fast_tracepoints (void)
250 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
253 /* True if LWP is stopped in its stepping range. */
256 lwp_in_step_range (struct lwp_info
*lwp
)
258 CORE_ADDR pc
= lwp
->stop_pc
;
260 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
263 struct pending_signals
267 struct pending_signals
*prev
;
270 /* The read/write ends of the pipe registered as waitable file in the
272 static int linux_event_pipe
[2] = { -1, -1 };
274 /* True if we're currently in async mode. */
275 #define target_is_async_p() (linux_event_pipe[0] != -1)
277 static void send_sigstop (struct lwp_info
*lwp
);
278 static void wait_for_sigstop (void);
280 /* Return non-zero if HEADER is a 64-bit ELF file. */
283 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
285 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
286 && header
->e_ident
[EI_MAG1
] == ELFMAG1
287 && header
->e_ident
[EI_MAG2
] == ELFMAG2
288 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
290 *machine
= header
->e_machine
;
291 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
298 /* Return non-zero if FILE is a 64-bit ELF file,
299 zero if the file is not a 64-bit ELF file,
300 and -1 if the file is not accessible or doesn't exist. */
303 elf_64_file_p (const char *file
, unsigned int *machine
)
308 fd
= open (file
, O_RDONLY
);
312 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
319 return elf_64_header_p (&header
, machine
);
322 /* Accepts an integer PID; Returns true if the executable PID is
323 running is a 64-bit ELF file.. */
326 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
330 sprintf (file
, "/proc/%d/exe", pid
);
331 return elf_64_file_p (file
, machine
);
335 delete_lwp (struct lwp_info
*lwp
)
337 struct thread_info
*thr
= get_lwp_thread (lwp
);
340 debug_printf ("deleting %ld\n", lwpid_of (thr
));
343 free (lwp
->arch_private
);
347 /* Add a process to the common process list, and set its private
350 static struct process_info
*
351 linux_add_process (int pid
, int attached
)
353 struct process_info
*proc
;
355 proc
= add_process (pid
, attached
);
356 proc
->private = xcalloc (1, sizeof (*proc
->private));
358 /* Set the arch when the first LWP stops. */
359 proc
->private->new_inferior
= 1;
361 if (the_low_target
.new_process
!= NULL
)
362 proc
->private->arch_private
= the_low_target
.new_process ();
367 /* Handle a GNU/Linux extended wait response. If we see a clone
368 event, we need to add the new LWP to our list (and not report the
369 trap to higher layers). */
372 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
374 int event
= wstat
>> 16;
375 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
376 struct lwp_info
*new_lwp
;
378 if (event
== PTRACE_EVENT_CLONE
)
381 unsigned long new_pid
;
384 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
387 /* If we haven't already seen the new PID stop, wait for it now. */
388 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
390 /* The new child has a pending SIGSTOP. We can't affect it until it
391 hits the SIGSTOP, but we're already attached. */
393 ret
= my_waitpid (new_pid
, &status
, __WALL
);
396 perror_with_name ("waiting for new child");
397 else if (ret
!= new_pid
)
398 warning ("wait returned unexpected PID %d", ret
);
399 else if (!WIFSTOPPED (status
))
400 warning ("wait returned unexpected status 0x%x", status
);
404 debug_printf ("HEW: Got clone event "
405 "from LWP %ld, new child is LWP %ld\n",
406 lwpid_of (event_thr
), new_pid
);
408 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
409 new_lwp
= add_lwp (ptid
);
411 /* Either we're going to immediately resume the new thread
412 or leave it stopped. linux_resume_one_lwp is a nop if it
413 thinks the thread is currently running, so set this first
414 before calling linux_resume_one_lwp. */
415 new_lwp
->stopped
= 1;
417 /* If we're suspending all threads, leave this one suspended
419 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
420 new_lwp
->suspended
= 1;
422 /* Normally we will get the pending SIGSTOP. But in some cases
423 we might get another signal delivered to the group first.
424 If we do get another signal, be sure not to lose it. */
425 if (WSTOPSIG (status
) == SIGSTOP
)
427 if (stopping_threads
!= NOT_STOPPING_THREADS
)
428 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
430 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
434 new_lwp
->stop_expected
= 1;
436 if (stopping_threads
!= NOT_STOPPING_THREADS
)
438 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
439 new_lwp
->status_pending_p
= 1;
440 new_lwp
->status_pending
= status
;
443 /* Pass the signal on. This is what GDB does - except
444 shouldn't we really report it instead? */
445 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
448 /* Always resume the current thread. If we are stopping
449 threads, it will have a pending SIGSTOP; we may as well
451 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
455 /* Return the PC as read from the regcache of LWP, without any
459 get_pc (struct lwp_info
*lwp
)
461 struct thread_info
*saved_inferior
;
462 struct regcache
*regcache
;
465 if (the_low_target
.get_pc
== NULL
)
468 saved_inferior
= current_inferior
;
469 current_inferior
= get_lwp_thread (lwp
);
471 regcache
= get_thread_regcache (current_inferior
, 1);
472 pc
= (*the_low_target
.get_pc
) (regcache
);
475 debug_printf ("pc is 0x%lx\n", (long) pc
);
477 current_inferior
= saved_inferior
;
481 /* This function should only be called if LWP got a SIGTRAP.
482 The SIGTRAP could mean several things.
484 On i386, where decr_pc_after_break is non-zero:
485 If we were single-stepping this process using PTRACE_SINGLESTEP,
486 we will get only the one SIGTRAP (even if the instruction we
487 stepped over was a breakpoint). The value of $eip will be the
489 If we continue the process using PTRACE_CONT, we will get a
490 SIGTRAP when we hit a breakpoint. The value of $eip will be
491 the instruction after the breakpoint (i.e. needs to be
492 decremented). If we report the SIGTRAP to GDB, we must also
493 report the undecremented PC. If we cancel the SIGTRAP, we
494 must resume at the decremented PC.
496 (Presumably, not yet tested) On a non-decr_pc_after_break machine
497 with hardware or kernel single-step:
498 If we single-step over a breakpoint instruction, our PC will
499 point at the following instruction. If we continue and hit a
500 breakpoint instruction, our PC will point at the breakpoint
504 get_stop_pc (struct lwp_info
*lwp
)
508 if (the_low_target
.get_pc
== NULL
)
511 stop_pc
= get_pc (lwp
);
513 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
515 && !lwp
->stopped_by_watchpoint
516 && lwp
->last_status
>> 16 == 0)
517 stop_pc
-= the_low_target
.decr_pc_after_break
;
520 debug_printf ("stop pc is 0x%lx\n", (long) stop_pc
);
525 static struct lwp_info
*
526 add_lwp (ptid_t ptid
)
528 struct lwp_info
*lwp
;
530 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
531 memset (lwp
, 0, sizeof (*lwp
));
533 if (the_low_target
.new_thread
!= NULL
)
534 lwp
->arch_private
= the_low_target
.new_thread ();
536 lwp
->thread
= add_thread (ptid
, lwp
);
541 /* Start an inferior process and returns its pid.
542 ALLARGS is a vector of program-name and args. */
545 linux_create_inferior (char *program
, char **allargs
)
547 #ifdef HAVE_PERSONALITY
548 int personality_orig
= 0, personality_set
= 0;
550 struct lwp_info
*new_lwp
;
554 #ifdef HAVE_PERSONALITY
555 if (disable_randomization
)
558 personality_orig
= personality (0xffffffff);
559 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
562 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
564 if (errno
!= 0 || (personality_set
565 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
566 warning ("Error disabling address space randomization: %s",
571 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
577 perror_with_name ("fork");
582 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
584 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
585 signal (__SIGRTMIN
+ 1, SIG_DFL
);
590 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
591 stdout to stderr so that inferior i/o doesn't corrupt the connection.
592 Also, redirect stdin to /dev/null. */
593 if (remote_connection_is_stdio ())
596 open ("/dev/null", O_RDONLY
);
598 if (write (2, "stdin/stdout redirected\n",
599 sizeof ("stdin/stdout redirected\n") - 1) < 0)
601 /* Errors ignored. */;
605 execv (program
, allargs
);
607 execvp (program
, allargs
);
609 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
615 #ifdef HAVE_PERSONALITY
619 personality (personality_orig
);
621 warning ("Error restoring address space randomization: %s",
626 linux_add_process (pid
, 0);
628 ptid
= ptid_build (pid
, pid
, 0);
629 new_lwp
= add_lwp (ptid
);
630 new_lwp
->must_set_ptrace_flags
= 1;
636 linux_attach_fail_reason_string (ptid_t ptid
, int err
)
638 static char *reason_string
;
639 struct buffer buffer
;
641 long lwpid
= ptid_get_lwp (ptid
);
643 xfree (reason_string
);
645 buffer_init (&buffer
);
646 linux_ptrace_attach_fail_reason (lwpid
, &buffer
);
647 buffer_grow_str0 (&buffer
, "");
648 warnings
= buffer_finish (&buffer
);
649 if (warnings
[0] != '\0')
650 reason_string
= xstrprintf ("%s (%d), %s",
651 strerror (err
), err
, warnings
);
653 reason_string
= xstrprintf ("%s (%d)",
654 strerror (err
), err
);
656 return reason_string
;
659 /* Attach to an inferior process. */
662 linux_attach_lwp (ptid_t ptid
)
664 struct lwp_info
*new_lwp
;
665 int lwpid
= ptid_get_lwp (ptid
);
667 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
671 new_lwp
= add_lwp (ptid
);
673 /* We need to wait for SIGSTOP before being able to make the next
674 ptrace call on this LWP. */
675 new_lwp
->must_set_ptrace_flags
= 1;
677 if (linux_proc_pid_is_stopped (lwpid
))
680 debug_printf ("Attached to a stopped process\n");
682 /* The process is definitely stopped. It is in a job control
683 stop, unless the kernel predates the TASK_STOPPED /
684 TASK_TRACED distinction, in which case it might be in a
685 ptrace stop. Make sure it is in a ptrace stop; from there we
686 can kill it, signal it, et cetera.
688 First make sure there is a pending SIGSTOP. Since we are
689 already attached, the process can not transition from stopped
690 to running without a PTRACE_CONT; so we know this signal will
691 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
692 probably already in the queue (unless this kernel is old
693 enough to use TASK_STOPPED for ptrace stops); but since
694 SIGSTOP is not an RT signal, it can only be queued once. */
695 kill_lwp (lwpid
, SIGSTOP
);
697 /* Finally, resume the stopped process. This will deliver the
698 SIGSTOP (or a higher priority signal, just like normal
699 PTRACE_ATTACH), which we'll catch later on. */
700 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
703 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
706 There are several cases to consider here:
708 1) gdbserver has already attached to the process and is being notified
709 of a new thread that is being created.
710 In this case we should ignore that SIGSTOP and resume the
711 process. This is handled below by setting stop_expected = 1,
712 and the fact that add_thread sets last_resume_kind ==
715 2) This is the first thread (the process thread), and we're attaching
716 to it via attach_inferior.
717 In this case we want the process thread to stop.
718 This is handled by having linux_attach set last_resume_kind ==
719 resume_stop after we return.
721 If the pid we are attaching to is also the tgid, we attach to and
722 stop all the existing threads. Otherwise, we attach to pid and
723 ignore any other threads in the same group as this pid.
725 3) GDB is connecting to gdbserver and is requesting an enumeration of all
727 In this case we want the thread to stop.
728 FIXME: This case is currently not properly handled.
729 We should wait for the SIGSTOP but don't. Things work apparently
730 because enough time passes between when we ptrace (ATTACH) and when
731 gdb makes the next ptrace call on the thread.
733 On the other hand, if we are currently trying to stop all threads, we
734 should treat the new thread as if we had sent it a SIGSTOP. This works
735 because we are guaranteed that the add_lwp call above added us to the
736 end of the list, and so the new thread has not yet reached
737 wait_for_sigstop (but will). */
738 new_lwp
->stop_expected
= 1;
743 /* Attach to PID. If PID is the tgid, attach to it and all
747 linux_attach (unsigned long pid
)
749 ptid_t ptid
= ptid_build (pid
, pid
, 0);
752 /* Attach to PID. We will check for other threads
754 err
= linux_attach_lwp (ptid
);
756 error ("Cannot attach to process %ld: %s",
757 pid
, linux_attach_fail_reason_string (ptid
, err
));
759 linux_add_process (pid
, 1);
763 struct thread_info
*thread
;
765 /* Don't ignore the initial SIGSTOP if we just attached to this
766 process. It will be collected by wait shortly. */
767 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
768 thread
->last_resume_kind
= resume_stop
;
771 if (linux_proc_get_tgid (pid
) == pid
)
776 sprintf (pathname
, "/proc/%ld/task", pid
);
778 dir
= opendir (pathname
);
782 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
787 /* At this point we attached to the tgid. Scan the task for
789 int new_threads_found
;
792 while (iterations
< 2)
796 new_threads_found
= 0;
797 /* Add all the other threads. While we go through the
798 threads, new threads may be spawned. Cycle through
799 the list of threads until we have done two iterations without
800 finding new threads. */
801 while ((dp
= readdir (dir
)) != NULL
)
807 lwp
= strtoul (dp
->d_name
, NULL
, 10);
809 ptid
= ptid_build (pid
, lwp
, 0);
811 /* Is this a new thread? */
812 if (lwp
!= 0 && find_thread_ptid (ptid
) == NULL
)
817 debug_printf ("Found new lwp %ld\n", lwp
);
819 err
= linux_attach_lwp (ptid
);
821 warning ("Cannot attach to lwp %ld: %s",
823 linux_attach_fail_reason_string (ptid
, err
));
829 if (!new_threads_found
)
850 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
852 struct counter
*counter
= args
;
854 if (ptid_get_pid (entry
->id
) == counter
->pid
)
856 if (++counter
->count
> 1)
864 last_thread_of_process_p (int pid
)
866 struct counter counter
= { pid
, 0 };
868 return (find_inferior (&all_threads
,
869 second_thread_of_pid_p
, &counter
) == NULL
);
875 linux_kill_one_lwp (struct lwp_info
*lwp
)
877 struct thread_info
*thr
= get_lwp_thread (lwp
);
878 int pid
= lwpid_of (thr
);
880 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
881 there is no signal context, and ptrace(PTRACE_KILL) (or
882 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
883 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
884 alternative is to kill with SIGKILL. We only need one SIGKILL
885 per process, not one for each thread. But since we still support
886 linuxthreads, and we also support debugging programs using raw
887 clone without CLONE_THREAD, we send one for each thread. For
888 years, we used PTRACE_KILL only, so we're being a bit paranoid
889 about some old kernels where PTRACE_KILL might work better
890 (dubious if there are any such, but that's why it's paranoia), so
891 we try SIGKILL first, PTRACE_KILL second, and so we're fine
895 kill_lwp (pid
, SIGKILL
);
898 int save_errno
= errno
;
900 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
901 target_pid_to_str (ptid_of (thr
)),
902 save_errno
? strerror (save_errno
) : "OK");
906 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
909 int save_errno
= errno
;
911 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
912 target_pid_to_str (ptid_of (thr
)),
913 save_errno
? strerror (save_errno
) : "OK");
917 /* Kill LWP and wait for it to die. */
920 kill_wait_lwp (struct lwp_info
*lwp
)
922 struct thread_info
*thr
= get_lwp_thread (lwp
);
923 int pid
= ptid_get_pid (ptid_of (thr
));
924 int lwpid
= ptid_get_lwp (ptid_of (thr
));
929 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
933 linux_kill_one_lwp (lwp
);
935 /* Make sure it died. Notes:
937 - The loop is most likely unnecessary.
939 - We don't use linux_wait_for_event as that could delete lwps
940 while we're iterating over them. We're not interested in
941 any pending status at this point, only in making sure all
942 wait status on the kernel side are collected until the
945 - We don't use __WALL here as the __WALL emulation relies on
946 SIGCHLD, and killing a stopped process doesn't generate
947 one, nor an exit status.
949 res
= my_waitpid (lwpid
, &wstat
, 0);
950 if (res
== -1 && errno
== ECHILD
)
951 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
952 } while (res
> 0 && WIFSTOPPED (wstat
));
954 gdb_assert (res
> 0);
957 /* Callback for `find_inferior'. Kills an lwp of a given process,
958 except the leader. */
961 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
963 struct thread_info
*thread
= (struct thread_info
*) entry
;
964 struct lwp_info
*lwp
= get_thread_lwp (thread
);
965 int pid
= * (int *) args
;
967 if (ptid_get_pid (entry
->id
) != pid
)
970 /* We avoid killing the first thread here, because of a Linux kernel (at
971 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
972 the children get a chance to be reaped, it will remain a zombie
975 if (lwpid_of (thread
) == pid
)
978 debug_printf ("lkop: is last of process %s\n",
979 target_pid_to_str (entry
->id
));
990 struct process_info
*process
;
991 struct lwp_info
*lwp
;
993 process
= find_process_pid (pid
);
997 /* If we're killing a running inferior, make sure it is stopped
998 first, as PTRACE_KILL will not work otherwise. */
999 stop_all_lwps (0, NULL
);
1001 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1003 /* See the comment in linux_kill_one_lwp. We did not kill the first
1004 thread in the list, so do so now. */
1005 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1010 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1014 kill_wait_lwp (lwp
);
1016 the_target
->mourn (process
);
1018 /* Since we presently can only stop all lwps of all processes, we
1019 need to unstop lwps of other processes. */
1020 unstop_all_lwps (0, NULL
);
1024 /* Get pending signal of THREAD, for detaching purposes. This is the
1025 signal the thread last stopped for, which we need to deliver to the
1026 thread when detaching, otherwise, it'd be suppressed/lost. */
1029 get_detach_signal (struct thread_info
*thread
)
1031 enum gdb_signal signo
= GDB_SIGNAL_0
;
1033 struct lwp_info
*lp
= get_thread_lwp (thread
);
1035 if (lp
->status_pending_p
)
1036 status
= lp
->status_pending
;
1039 /* If the thread had been suspended by gdbserver, and it stopped
1040 cleanly, then it'll have stopped with SIGSTOP. But we don't
1041 want to deliver that SIGSTOP. */
1042 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1043 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1046 /* Otherwise, we may need to deliver the signal we
1048 status
= lp
->last_status
;
1051 if (!WIFSTOPPED (status
))
1054 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1055 target_pid_to_str (ptid_of (thread
)));
1059 /* Extended wait statuses aren't real SIGTRAPs. */
1060 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1063 debug_printf ("GPS: lwp %s had stopped with extended "
1064 "status: no pending signal\n",
1065 target_pid_to_str (ptid_of (thread
)));
1069 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1071 if (program_signals_p
&& !program_signals
[signo
])
1074 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1075 target_pid_to_str (ptid_of (thread
)),
1076 gdb_signal_to_string (signo
));
1079 else if (!program_signals_p
1080 /* If we have no way to know which signals GDB does not
1081 want to have passed to the program, assume
1082 SIGTRAP/SIGINT, which is GDB's default. */
1083 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1086 debug_printf ("GPS: lwp %s had signal %s, "
1087 "but we don't know if we should pass it. "
1088 "Default to not.\n",
1089 target_pid_to_str (ptid_of (thread
)),
1090 gdb_signal_to_string (signo
));
1096 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1097 target_pid_to_str (ptid_of (thread
)),
1098 gdb_signal_to_string (signo
));
1100 return WSTOPSIG (status
);
1105 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1107 struct thread_info
*thread
= (struct thread_info
*) entry
;
1108 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1109 int pid
= * (int *) args
;
1112 if (ptid_get_pid (entry
->id
) != pid
)
1115 /* If there is a pending SIGSTOP, get rid of it. */
1116 if (lwp
->stop_expected
)
1119 debug_printf ("Sending SIGCONT to %s\n",
1120 target_pid_to_str (ptid_of (thread
)));
1122 kill_lwp (lwpid_of (thread
), SIGCONT
);
1123 lwp
->stop_expected
= 0;
1126 /* Flush any pending changes to the process's registers. */
1127 regcache_invalidate_thread (thread
);
1129 /* Pass on any pending signal for this thread. */
1130 sig
= get_detach_signal (thread
);
1132 /* Finally, let it resume. */
1133 if (the_low_target
.prepare_to_resume
!= NULL
)
1134 the_low_target
.prepare_to_resume (lwp
);
1135 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1136 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1137 error (_("Can't detach %s: %s"),
1138 target_pid_to_str (ptid_of (thread
)),
1146 linux_detach (int pid
)
1148 struct process_info
*process
;
1150 process
= find_process_pid (pid
);
1151 if (process
== NULL
)
1154 /* Stop all threads before detaching. First, ptrace requires that
1155 the thread is stopped to sucessfully detach. Second, thread_db
1156 may need to uninstall thread event breakpoints from memory, which
1157 only works with a stopped process anyway. */
1158 stop_all_lwps (0, NULL
);
1160 #ifdef USE_THREAD_DB
1161 thread_db_detach (process
);
1164 /* Stabilize threads (move out of jump pads). */
1165 stabilize_threads ();
1167 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1169 the_target
->mourn (process
);
1171 /* Since we presently can only stop all lwps of all processes, we
1172 need to unstop lwps of other processes. */
1173 unstop_all_lwps (0, NULL
);
1177 /* Remove all LWPs that belong to process PROC from the lwp list. */
1180 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1182 struct thread_info
*thread
= (struct thread_info
*) entry
;
1183 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1184 struct process_info
*process
= proc
;
1186 if (pid_of (thread
) == pid_of (process
))
1193 linux_mourn (struct process_info
*process
)
1195 struct process_info_private
*priv
;
1197 #ifdef USE_THREAD_DB
1198 thread_db_mourn (process
);
1201 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1203 /* Freeing all private data. */
1204 priv
= process
->private;
1205 free (priv
->arch_private
);
1207 process
->private = NULL
;
1209 remove_process (process
);
1213 linux_join (int pid
)
1218 ret
= my_waitpid (pid
, &status
, 0);
1219 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1221 } while (ret
!= -1 || errno
!= ECHILD
);
1224 /* Return nonzero if the given thread is still alive. */
1226 linux_thread_alive (ptid_t ptid
)
1228 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1230 /* We assume we always know if a thread exits. If a whole process
1231 exited but we still haven't been able to report it to GDB, we'll
1232 hold on to the last lwp of the dead process. */
1239 /* Return 1 if this lwp has an interesting status pending. */
1241 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1243 struct thread_info
*thread
= (struct thread_info
*) entry
;
1244 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1245 ptid_t ptid
= * (ptid_t
*) arg
;
1247 /* Check if we're only interested in events from a specific process
1249 if (!ptid_equal (minus_one_ptid
, ptid
)
1250 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1253 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1254 report any status pending the LWP may have. */
1255 if (thread
->last_resume_kind
== resume_stop
1256 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1259 return lwp
->status_pending_p
;
1263 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1265 ptid_t ptid
= *(ptid_t
*) data
;
1268 if (ptid_get_lwp (ptid
) != 0)
1269 lwp
= ptid_get_lwp (ptid
);
1271 lwp
= ptid_get_pid (ptid
);
1273 if (ptid_get_lwp (entry
->id
) == lwp
)
1280 find_lwp_pid (ptid_t ptid
)
1282 struct inferior_list_entry
*thread
1283 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1288 return get_thread_lwp ((struct thread_info
*) thread
);
1291 /* Return the number of known LWPs in the tgid given by PID. */
1296 struct inferior_list_entry
*inf
, *tmp
;
1299 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1301 if (ptid_get_pid (inf
->id
) == pid
)
1308 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1309 their exits until all other threads in the group have exited. */
1312 check_zombie_leaders (void)
1314 struct process_info
*proc
, *tmp
;
1316 ALL_PROCESSES (proc
, tmp
)
1318 pid_t leader_pid
= pid_of (proc
);
1319 struct lwp_info
*leader_lp
;
1321 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1324 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1325 "num_lwps=%d, zombie=%d\n",
1326 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1327 linux_proc_pid_is_zombie (leader_pid
));
1329 if (leader_lp
!= NULL
1330 /* Check if there are other threads in the group, as we may
1331 have raced with the inferior simply exiting. */
1332 && !last_thread_of_process_p (leader_pid
)
1333 && linux_proc_pid_is_zombie (leader_pid
))
1335 /* A leader zombie can mean one of two things:
1337 - It exited, and there's an exit status pending
1338 available, or only the leader exited (not the whole
1339 program). In the latter case, we can't waitpid the
1340 leader's exit status until all other threads are gone.
1342 - There are 3 or more threads in the group, and a thread
1343 other than the leader exec'd. On an exec, the Linux
1344 kernel destroys all other threads (except the execing
1345 one) in the thread group, and resets the execing thread's
1346 tid to the tgid. No exit notification is sent for the
1347 execing thread -- from the ptracer's perspective, it
1348 appears as though the execing thread just vanishes.
1349 Until we reap all other threads except the leader and the
1350 execing thread, the leader will be zombie, and the
1351 execing thread will be in `D (disc sleep)'. As soon as
1352 all other threads are reaped, the execing thread changes
1353 it's tid to the tgid, and the previous (zombie) leader
1354 vanishes, giving place to the "new" leader. We could try
1355 distinguishing the exit and exec cases, by waiting once
1356 more, and seeing if something comes out, but it doesn't
1357 sound useful. The previous leader _does_ go away, and
1358 we'll re-add the new one once we see the exec event
1359 (which is just the same as what would happen if the
1360 previous leader did exit voluntarily before some other
1365 "CZL: Thread group leader %d zombie "
1366 "(it exited, or another thread execd).\n",
1369 delete_lwp (leader_lp
);
1374 /* Callback for `find_inferior'. Returns the first LWP that is not
1375 stopped. ARG is a PTID filter. */
1378 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1380 struct thread_info
*thr
= (struct thread_info
*) entry
;
1381 struct lwp_info
*lwp
;
1382 ptid_t filter
= *(ptid_t
*) arg
;
1384 if (!ptid_match (ptid_of (thr
), filter
))
1387 lwp
= get_thread_lwp (thr
);
1394 /* This function should only be called if the LWP got a SIGTRAP.
1396 Handle any tracepoint steps or hits. Return true if a tracepoint
1397 event was handled, 0 otherwise. */
1400 handle_tracepoints (struct lwp_info
*lwp
)
1402 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1403 int tpoint_related_event
= 0;
1405 /* If this tracepoint hit causes a tracing stop, we'll immediately
1406 uninsert tracepoints. To do this, we temporarily pause all
1407 threads, unpatch away, and then unpause threads. We need to make
1408 sure the unpausing doesn't resume LWP too. */
1411 /* And we need to be sure that any all-threads-stopping doesn't try
1412 to move threads out of the jump pads, as it could deadlock the
1413 inferior (LWP could be in the jump pad, maybe even holding the
1416 /* Do any necessary step collect actions. */
1417 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1419 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1421 /* See if we just hit a tracepoint and do its main collect
1423 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1427 gdb_assert (lwp
->suspended
== 0);
1428 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1430 if (tpoint_related_event
)
1433 debug_printf ("got a tracepoint event\n");
1440 /* Convenience wrapper. Returns true if LWP is presently collecting a
1444 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1445 struct fast_tpoint_collect_status
*status
)
1447 CORE_ADDR thread_area
;
1448 struct thread_info
*thread
= get_lwp_thread (lwp
);
1450 if (the_low_target
.get_thread_area
== NULL
)
1453 /* Get the thread area address. This is used to recognize which
1454 thread is which when tracing with the in-process agent library.
1455 We don't read anything from the address, and treat it as opaque;
1456 it's the address itself that we assume is unique per-thread. */
1457 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1460 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1463 /* The reason we resume in the caller, is because we want to be able
1464 to pass lwp->status_pending as WSTAT, and we need to clear
1465 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1466 refuses to resume. */
1469 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1471 struct thread_info
*saved_inferior
;
1473 saved_inferior
= current_inferior
;
1474 current_inferior
= get_lwp_thread (lwp
);
1477 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1478 && supports_fast_tracepoints ()
1479 && agent_loaded_p ())
1481 struct fast_tpoint_collect_status status
;
1485 debug_printf ("Checking whether LWP %ld needs to move out of the "
1487 lwpid_of (current_inferior
));
1489 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1492 || (WSTOPSIG (*wstat
) != SIGILL
1493 && WSTOPSIG (*wstat
) != SIGFPE
1494 && WSTOPSIG (*wstat
) != SIGSEGV
1495 && WSTOPSIG (*wstat
) != SIGBUS
))
1497 lwp
->collecting_fast_tracepoint
= r
;
1501 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1503 /* Haven't executed the original instruction yet.
1504 Set breakpoint there, and wait till it's hit,
1505 then single-step until exiting the jump pad. */
1506 lwp
->exit_jump_pad_bkpt
1507 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1511 debug_printf ("Checking whether LWP %ld needs to move out of "
1512 "the jump pad...it does\n",
1513 lwpid_of (current_inferior
));
1514 current_inferior
= saved_inferior
;
1521 /* If we get a synchronous signal while collecting, *and*
1522 while executing the (relocated) original instruction,
1523 reset the PC to point at the tpoint address, before
1524 reporting to GDB. Otherwise, it's an IPA lib bug: just
1525 report the signal to GDB, and pray for the best. */
1527 lwp
->collecting_fast_tracepoint
= 0;
1530 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1531 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1534 struct regcache
*regcache
;
1536 /* The si_addr on a few signals references the address
1537 of the faulting instruction. Adjust that as
1539 if ((WSTOPSIG (*wstat
) == SIGILL
1540 || WSTOPSIG (*wstat
) == SIGFPE
1541 || WSTOPSIG (*wstat
) == SIGBUS
1542 || WSTOPSIG (*wstat
) == SIGSEGV
)
1543 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
1544 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1545 /* Final check just to make sure we don't clobber
1546 the siginfo of non-kernel-sent signals. */
1547 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1549 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1550 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_inferior
),
1551 (PTRACE_TYPE_ARG3
) 0, &info
);
1554 regcache
= get_thread_regcache (current_inferior
, 1);
1555 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1556 lwp
->stop_pc
= status
.tpoint_addr
;
1558 /* Cancel any fast tracepoint lock this thread was
1560 force_unlock_trace_buffer ();
1563 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1566 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1567 "stopping all threads momentarily.\n");
1569 stop_all_lwps (1, lwp
);
1570 cancel_breakpoints ();
1572 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1573 lwp
->exit_jump_pad_bkpt
= NULL
;
1575 unstop_all_lwps (1, lwp
);
1577 gdb_assert (lwp
->suspended
>= 0);
1583 debug_printf ("Checking whether LWP %ld needs to move out of the "
1585 lwpid_of (current_inferior
));
1587 current_inferior
= saved_inferior
;
1591 /* Enqueue one signal in the "signals to report later when out of the
1595 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1597 struct pending_signals
*p_sig
;
1598 struct thread_info
*thread
= get_lwp_thread (lwp
);
1601 debug_printf ("Deferring signal %d for LWP %ld.\n",
1602 WSTOPSIG (*wstat
), lwpid_of (thread
));
1606 struct pending_signals
*sig
;
1608 for (sig
= lwp
->pending_signals_to_report
;
1611 debug_printf (" Already queued %d\n",
1614 debug_printf (" (no more currently queued signals)\n");
1617 /* Don't enqueue non-RT signals if they are already in the deferred
1618 queue. (SIGSTOP being the easiest signal to see ending up here
1620 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1622 struct pending_signals
*sig
;
1624 for (sig
= lwp
->pending_signals_to_report
;
1628 if (sig
->signal
== WSTOPSIG (*wstat
))
1631 debug_printf ("Not requeuing already queued non-RT signal %d"
1640 p_sig
= xmalloc (sizeof (*p_sig
));
1641 p_sig
->prev
= lwp
->pending_signals_to_report
;
1642 p_sig
->signal
= WSTOPSIG (*wstat
);
1643 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1644 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1647 lwp
->pending_signals_to_report
= p_sig
;
1650 /* Dequeue one signal from the "signals to report later when out of
1651 the jump pad" list. */
1654 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1656 struct thread_info
*thread
= get_lwp_thread (lwp
);
1658 if (lwp
->pending_signals_to_report
!= NULL
)
1660 struct pending_signals
**p_sig
;
1662 p_sig
= &lwp
->pending_signals_to_report
;
1663 while ((*p_sig
)->prev
!= NULL
)
1664 p_sig
= &(*p_sig
)->prev
;
1666 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1667 if ((*p_sig
)->info
.si_signo
!= 0)
1668 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1674 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1675 WSTOPSIG (*wstat
), lwpid_of (thread
));
1679 struct pending_signals
*sig
;
1681 for (sig
= lwp
->pending_signals_to_report
;
1684 debug_printf (" Still queued %d\n",
1687 debug_printf (" (no more queued signals)\n");
1696 /* Arrange for a breakpoint to be hit again later. We don't keep the
1697 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1698 will handle the current event, eventually we will resume this LWP,
1699 and this breakpoint will trap again. */
1702 cancel_breakpoint (struct lwp_info
*lwp
)
1704 struct thread_info
*saved_inferior
;
1706 /* There's nothing to do if we don't support breakpoints. */
1707 if (!supports_breakpoints ())
1710 /* breakpoint_at reads from current inferior. */
1711 saved_inferior
= current_inferior
;
1712 current_inferior
= get_lwp_thread (lwp
);
1714 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1717 debug_printf ("CB: Push back breakpoint for %s\n",
1718 target_pid_to_str (ptid_of (current_inferior
)));
1720 /* Back up the PC if necessary. */
1721 if (the_low_target
.decr_pc_after_break
)
1723 struct regcache
*regcache
1724 = get_thread_regcache (current_inferior
, 1);
1725 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1728 current_inferior
= saved_inferior
;
1734 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1735 paddress (lwp
->stop_pc
),
1736 target_pid_to_str (ptid_of (current_inferior
)));
1739 current_inferior
= saved_inferior
;
1743 /* Do low-level handling of the event, and check if we should go on
1744 and pass it to caller code. Return the affected lwp if we are, or
1747 static struct lwp_info
*
1748 linux_low_filter_event (ptid_t filter_ptid
, int lwpid
, int wstat
)
1750 struct lwp_info
*child
;
1751 struct thread_info
*thread
;
1753 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1755 /* If we didn't find a process, one of two things presumably happened:
1756 - A process we started and then detached from has exited. Ignore it.
1757 - A process we are controlling has forked and the new child's stop
1758 was reported to us by the kernel. Save its PID. */
1759 if (child
== NULL
&& WIFSTOPPED (wstat
))
1761 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1764 else if (child
== NULL
)
1767 thread
= get_lwp_thread (child
);
1771 child
->last_status
= wstat
;
1773 if (WIFSTOPPED (wstat
))
1775 struct process_info
*proc
;
1777 /* Architecture-specific setup after inferior is running. This
1778 needs to happen after we have attached to the inferior and it
1779 is stopped for the first time, but before we access any
1780 inferior registers. */
1781 proc
= find_process_pid (pid_of (thread
));
1782 if (proc
->private->new_inferior
)
1784 struct thread_info
*saved_inferior
;
1786 saved_inferior
= current_inferior
;
1787 current_inferior
= thread
;
1789 the_low_target
.arch_setup ();
1791 current_inferior
= saved_inferior
;
1793 proc
->private->new_inferior
= 0;
1797 /* Store the STOP_PC, with adjustment applied. This depends on the
1798 architecture being defined already (so that CHILD has a valid
1799 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1801 if (WIFSTOPPED (wstat
))
1804 && the_low_target
.get_pc
!= NULL
)
1806 struct thread_info
*saved_inferior
;
1807 struct regcache
*regcache
;
1810 saved_inferior
= current_inferior
;
1811 current_inferior
= thread
;
1812 regcache
= get_thread_regcache (current_inferior
, 1);
1813 pc
= (*the_low_target
.get_pc
) (regcache
);
1814 debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc
);
1815 current_inferior
= saved_inferior
;
1818 child
->stop_pc
= get_stop_pc (child
);
1821 /* Fetch the possibly triggered data watchpoint info and store it in
1824 On some archs, like x86, that use debug registers to set
1825 watchpoints, it's possible that the way to know which watched
1826 address trapped, is to check the register that is used to select
1827 which address to watch. Problem is, between setting the
1828 watchpoint and reading back which data address trapped, the user
1829 may change the set of watchpoints, and, as a consequence, GDB
1830 changes the debug registers in the inferior. To avoid reading
1831 back a stale stopped-data-address when that happens, we cache in
1832 LP the fact that a watchpoint trapped, and the corresponding data
1833 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1834 changes the debug registers meanwhile, we have the cached data we
1837 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
)
1839 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1841 child
->stopped_by_watchpoint
= 0;
1845 struct thread_info
*saved_inferior
;
1847 saved_inferior
= current_inferior
;
1848 current_inferior
= thread
;
1850 child
->stopped_by_watchpoint
1851 = the_low_target
.stopped_by_watchpoint ();
1853 if (child
->stopped_by_watchpoint
)
1855 if (the_low_target
.stopped_data_address
!= NULL
)
1856 child
->stopped_data_address
1857 = the_low_target
.stopped_data_address ();
1859 child
->stopped_data_address
= 0;
1862 current_inferior
= saved_inferior
;
1866 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1868 linux_enable_event_reporting (lwpid
);
1869 child
->must_set_ptrace_flags
= 0;
1872 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1873 && wstat
>> 16 != 0)
1875 handle_extended_wait (child
, wstat
);
1879 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1880 && child
->stop_expected
)
1883 debug_printf ("Expected stop.\n");
1884 child
->stop_expected
= 0;
1886 if (thread
->last_resume_kind
== resume_stop
)
1888 /* We want to report the stop to the core. Treat the
1889 SIGSTOP as a normal event. */
1891 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1893 /* Stopping threads. We don't want this SIGSTOP to end up
1894 pending in the FILTER_PTID handling below. */
1899 /* Filter out the event. */
1900 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1905 /* Check if the thread has exited. */
1906 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1907 && num_lwps (pid_of (thread
)) > 1)
1910 debug_printf ("LLW: %d exited.\n", lwpid
);
1912 /* If there is at least one more LWP, then the exit signal
1913 was not the end of the debugged application and should be
1919 if (!ptid_match (ptid_of (thread
), filter_ptid
))
1922 debug_printf ("LWP %d got an event %06x, leaving pending.\n",
1925 if (WIFSTOPPED (wstat
))
1927 child
->status_pending_p
= 1;
1928 child
->status_pending
= wstat
;
1930 if (WSTOPSIG (wstat
) != SIGSTOP
)
1932 /* Cancel breakpoint hits. The breakpoint may be
1933 removed before we fetch events from this process to
1934 report to the core. It is best not to assume the
1935 moribund breakpoints heuristic always handles these
1936 cases --- it could be too many events go through to
1937 the core before this one is handled. All-stop always
1938 cancels breakpoint hits in all threads. */
1940 && WSTOPSIG (wstat
) == SIGTRAP
1941 && cancel_breakpoint (child
))
1943 /* Throw away the SIGTRAP. */
1944 child
->status_pending_p
= 0;
1947 debug_printf ("LLW: LWP %d hit a breakpoint while"
1948 " waiting for another process;"
1949 " cancelled it\n", lwpid
);
1953 else if (WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1956 debug_printf ("LLWE: process %d exited while fetching "
1957 "event from another LWP\n", lwpid
);
1959 /* This was the last lwp in the process. Since events are
1960 serialized to GDB core, and we can't report this one
1961 right now, but GDB core and the other target layers will
1962 want to be notified about the exit code/signal, leave the
1963 status pending for the next time we're able to report
1965 mark_lwp_dead (child
, wstat
);
1974 /* When the event-loop is doing a step-over, this points at the thread
1976 ptid_t step_over_bkpt
;
1978 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1979 match FILTER_PTID (leaving others pending). The PTIDs can be:
1980 minus_one_ptid, to specify any child; a pid PTID, specifying all
1981 lwps of a thread group; or a PTID representing a single lwp. Store
1982 the stop status through the status pointer WSTAT. OPTIONS is
1983 passed to the waitpid call. Return 0 if no event was found and
1984 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1985 was found. Return the PID of the stopped child otherwise. */
1988 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1989 int *wstatp
, int options
)
1991 struct thread_info
*event_thread
;
1992 struct lwp_info
*event_child
, *requested_child
;
1993 sigset_t block_mask
, prev_mask
;
1996 /* N.B. event_thread points to the thread_info struct that contains
1997 event_child. Keep them in sync. */
1998 event_thread
= NULL
;
2000 requested_child
= NULL
;
2002 /* Check for a lwp with a pending status. */
2004 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2006 event_thread
= (struct thread_info
*)
2007 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2008 if (event_thread
!= NULL
)
2009 event_child
= get_thread_lwp (event_thread
);
2010 if (debug_threads
&& event_thread
)
2011 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2013 else if (!ptid_equal (filter_ptid
, null_ptid
))
2015 requested_child
= find_lwp_pid (filter_ptid
);
2017 if (stopping_threads
== NOT_STOPPING_THREADS
2018 && requested_child
->status_pending_p
2019 && requested_child
->collecting_fast_tracepoint
)
2021 enqueue_one_deferred_signal (requested_child
,
2022 &requested_child
->status_pending
);
2023 requested_child
->status_pending_p
= 0;
2024 requested_child
->status_pending
= 0;
2025 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2028 if (requested_child
->suspended
2029 && requested_child
->status_pending_p
)
2030 fatal ("requesting an event out of a suspended child?");
2032 if (requested_child
->status_pending_p
)
2034 event_child
= requested_child
;
2035 event_thread
= get_lwp_thread (event_child
);
2039 if (event_child
!= NULL
)
2042 debug_printf ("Got an event from pending child %ld (%04x)\n",
2043 lwpid_of (event_thread
), event_child
->status_pending
);
2044 *wstatp
= event_child
->status_pending
;
2045 event_child
->status_pending_p
= 0;
2046 event_child
->status_pending
= 0;
2047 current_inferior
= event_thread
;
2048 return lwpid_of (event_thread
);
2051 /* But if we don't find a pending event, we'll have to wait.
2053 We only enter this loop if no process has a pending wait status.
2054 Thus any action taken in response to a wait status inside this
2055 loop is responding as soon as we detect the status, not after any
2058 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2059 all signals while here. */
2060 sigfillset (&block_mask
);
2061 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2063 while (event_child
== NULL
)
2067 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2070 - If the thread group leader exits while other threads in the
2071 thread group still exist, waitpid(TGID, ...) hangs. That
2072 waitpid won't return an exit status until the other threads
2073 in the group are reaped.
2075 - When a non-leader thread execs, that thread just vanishes
2076 without reporting an exit (so we'd hang if we waited for it
2077 explicitly in that case). The exec event is reported to
2078 the TGID pid (although we don't currently enable exec
2081 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2084 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2085 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2091 debug_printf ("LLW: waitpid %ld received %s\n",
2092 (long) ret
, status_to_str (*wstatp
));
2095 event_child
= linux_low_filter_event (filter_ptid
,
2097 if (event_child
!= NULL
)
2099 /* We got an event to report to the core. */
2100 event_thread
= get_lwp_thread (event_child
);
2104 /* Retry until nothing comes out of waitpid. A single
2105 SIGCHLD can indicate more than one child stopped. */
2109 /* Check for zombie thread group leaders. Those can't be reaped
2110 until all other threads in the thread group are. */
2111 check_zombie_leaders ();
2113 /* If there are no resumed children left in the set of LWPs we
2114 want to wait for, bail. We can't just block in
2115 waitpid/sigsuspend, because lwps might have been left stopped
2116 in trace-stop state, and we'd be stuck forever waiting for
2117 their status to change (which would only happen if we resumed
2118 them). Even if WNOHANG is set, this return code is preferred
2119 over 0 (below), as it is more detailed. */
2120 if ((find_inferior (&all_threads
,
2121 not_stopped_callback
,
2122 &wait_ptid
) == NULL
))
2125 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2126 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2130 /* No interesting event to report to the caller. */
2131 if ((options
& WNOHANG
))
2134 debug_printf ("WNOHANG set, no event found\n");
2136 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2140 /* Block until we get an event reported with SIGCHLD. */
2142 debug_printf ("sigsuspend'ing\n");
2144 sigsuspend (&prev_mask
);
2145 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2149 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2151 current_inferior
= event_thread
;
2153 /* Check for thread exit. */
2154 if (! WIFSTOPPED (*wstatp
))
2156 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2159 debug_printf ("LWP %d is the last lwp of process. "
2160 "Process %ld exiting.\n",
2161 pid_of (event_thread
), lwpid_of (event_thread
));
2162 return lwpid_of (event_thread
);
2165 return lwpid_of (event_thread
);
2168 /* Wait for an event from child(ren) PTID. PTIDs can be:
2169 minus_one_ptid, to specify any child; a pid PTID, specifying all
2170 lwps of a thread group; or a PTID representing a single lwp. Store
2171 the stop status through the status pointer WSTAT. OPTIONS is
2172 passed to the waitpid call. Return 0 if no event was found and
2173 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2174 was found. Return the PID of the stopped child otherwise. */
2177 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2179 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2182 /* Count the LWP's that have had events. */
2185 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2187 struct thread_info
*thread
= (struct thread_info
*) entry
;
2188 struct lwp_info
*lp
= get_thread_lwp (thread
);
2191 gdb_assert (count
!= NULL
);
2193 /* Count only resumed LWPs that have a SIGTRAP event pending that
2194 should be reported to GDB. */
2195 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2196 && thread
->last_resume_kind
!= resume_stop
2197 && lp
->status_pending_p
2198 && WIFSTOPPED (lp
->status_pending
)
2199 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2200 && !breakpoint_inserted_here (lp
->stop_pc
))
2206 /* Select the LWP (if any) that is currently being single-stepped. */
2209 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2211 struct thread_info
*thread
= (struct thread_info
*) entry
;
2212 struct lwp_info
*lp
= get_thread_lwp (thread
);
2214 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2215 && thread
->last_resume_kind
== resume_step
2216 && lp
->status_pending_p
)
2222 /* Select the Nth LWP that has had a SIGTRAP event that should be
2226 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2228 struct thread_info
*thread
= (struct thread_info
*) entry
;
2229 struct lwp_info
*lp
= get_thread_lwp (thread
);
2230 int *selector
= data
;
2232 gdb_assert (selector
!= NULL
);
2234 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2235 if (thread
->last_resume_kind
!= resume_stop
2236 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2237 && lp
->status_pending_p
2238 && WIFSTOPPED (lp
->status_pending
)
2239 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2240 && !breakpoint_inserted_here (lp
->stop_pc
))
2241 if ((*selector
)-- == 0)
2248 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2250 struct thread_info
*thread
= (struct thread_info
*) entry
;
2251 struct lwp_info
*lp
= get_thread_lwp (thread
);
2252 struct lwp_info
*event_lp
= data
;
2254 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2258 /* If a LWP other than the LWP that we're reporting an event for has
2259 hit a GDB breakpoint (as opposed to some random trap signal),
2260 then just arrange for it to hit it again later. We don't keep
2261 the SIGTRAP status and don't forward the SIGTRAP signal to the
2262 LWP. We will handle the current event, eventually we will resume
2263 all LWPs, and this one will get its breakpoint trap again.
2265 If we do not do this, then we run the risk that the user will
2266 delete or disable the breakpoint, but the LWP will have already
2269 if (thread
->last_resume_kind
!= resume_stop
2270 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2271 && lp
->status_pending_p
2272 && WIFSTOPPED (lp
->status_pending
)
2273 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2275 && !lp
->stopped_by_watchpoint
2276 && cancel_breakpoint (lp
))
2277 /* Throw away the SIGTRAP. */
2278 lp
->status_pending_p
= 0;
2284 linux_cancel_breakpoints (void)
2286 find_inferior (&all_threads
, cancel_breakpoints_callback
, NULL
);
2289 /* Select one LWP out of those that have events pending. */
2292 select_event_lwp (struct lwp_info
**orig_lp
)
2295 int random_selector
;
2296 struct thread_info
*event_thread
;
2298 /* Give preference to any LWP that is being single-stepped. */
2300 = (struct thread_info
*) find_inferior (&all_threads
,
2301 select_singlestep_lwp_callback
,
2303 if (event_thread
!= NULL
)
2306 debug_printf ("SEL: Select single-step %s\n",
2307 target_pid_to_str (ptid_of (event_thread
)));
2311 /* No single-stepping LWP. Select one at random, out of those
2312 which have had SIGTRAP events. */
2314 /* First see how many SIGTRAP events we have. */
2315 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2317 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2318 random_selector
= (int)
2319 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2321 if (debug_threads
&& num_events
> 1)
2322 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2323 num_events
, random_selector
);
2326 = (struct thread_info
*) find_inferior (&all_threads
,
2327 select_event_lwp_callback
,
2331 if (event_thread
!= NULL
)
2333 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2335 /* Switch the event LWP. */
2336 *orig_lp
= event_lp
;
2340 /* Decrement the suspend count of an LWP. */
2343 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2345 struct thread_info
*thread
= (struct thread_info
*) entry
;
2346 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2348 /* Ignore EXCEPT. */
2354 gdb_assert (lwp
->suspended
>= 0);
2358 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2362 unsuspend_all_lwps (struct lwp_info
*except
)
2364 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2367 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2368 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2370 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2371 static ptid_t
linux_wait_1 (ptid_t ptid
,
2372 struct target_waitstatus
*ourstatus
,
2373 int target_options
);
2375 /* Stabilize threads (move out of jump pads).
2377 If a thread is midway collecting a fast tracepoint, we need to
2378 finish the collection and move it out of the jump pad before
2379 reporting the signal.
2381 This avoids recursion while collecting (when a signal arrives
2382 midway, and the signal handler itself collects), which would trash
2383 the trace buffer. In case the user set a breakpoint in a signal
2384 handler, this avoids the backtrace showing the jump pad, etc..
2385 Most importantly, there are certain things we can't do safely if
2386 threads are stopped in a jump pad (or in its callee's). For
2389 - starting a new trace run. A thread still collecting the
2390 previous run, could trash the trace buffer when resumed. The trace
2391 buffer control structures would have been reset but the thread had
2392 no way to tell. The thread could even midway memcpy'ing to the
2393 buffer, which would mean that when resumed, it would clobber the
2394 trace buffer that had been set for a new run.
2396 - we can't rewrite/reuse the jump pads for new tracepoints
2397 safely. Say you do tstart while a thread is stopped midway while
2398 collecting. When the thread is later resumed, it finishes the
2399 collection, and returns to the jump pad, to execute the original
2400 instruction that was under the tracepoint jump at the time the
2401 older run had been started. If the jump pad had been rewritten
2402 since for something else in the new run, the thread would now
2403 execute the wrong / random instructions. */
2406 linux_stabilize_threads (void)
2408 struct thread_info
*save_inferior
;
2409 struct thread_info
*thread_stuck
;
2412 = (struct thread_info
*) find_inferior (&all_threads
,
2413 stuck_in_jump_pad_callback
,
2415 if (thread_stuck
!= NULL
)
2418 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2419 lwpid_of (thread_stuck
));
2423 save_inferior
= current_inferior
;
2425 stabilizing_threads
= 1;
2428 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2430 /* Loop until all are stopped out of the jump pads. */
2431 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2433 struct target_waitstatus ourstatus
;
2434 struct lwp_info
*lwp
;
2437 /* Note that we go through the full wait even loop. While
2438 moving threads out of jump pad, we need to be able to step
2439 over internal breakpoints and such. */
2440 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2442 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2444 lwp
= get_thread_lwp (current_inferior
);
2449 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2450 || current_inferior
->last_resume_kind
== resume_stop
)
2452 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2453 enqueue_one_deferred_signal (lwp
, &wstat
);
2458 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2460 stabilizing_threads
= 0;
2462 current_inferior
= save_inferior
;
2467 = (struct thread_info
*) find_inferior (&all_threads
,
2468 stuck_in_jump_pad_callback
,
2470 if (thread_stuck
!= NULL
)
2471 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2472 lwpid_of (thread_stuck
));
2476 /* Wait for process, returns status. */
2479 linux_wait_1 (ptid_t ptid
,
2480 struct target_waitstatus
*ourstatus
, int target_options
)
2483 struct lwp_info
*event_child
;
2486 int step_over_finished
;
2487 int bp_explains_trap
;
2488 int maybe_internal_trap
;
2496 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2499 /* Translate generic target options into linux options. */
2501 if (target_options
& TARGET_WNOHANG
)
2505 bp_explains_trap
= 0;
2508 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2510 /* If we were only supposed to resume one thread, only wait for
2511 that thread - if it's still alive. If it died, however - which
2512 can happen if we're coming from the thread death case below -
2513 then we need to make sure we restart the other threads. We could
2514 pick a thread at random or restart all; restarting all is less
2517 && !ptid_equal (cont_thread
, null_ptid
)
2518 && !ptid_equal (cont_thread
, minus_one_ptid
))
2520 struct thread_info
*thread
;
2522 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2525 /* No stepping, no signal - unless one is pending already, of course. */
2528 struct thread_resume resume_info
;
2529 resume_info
.thread
= minus_one_ptid
;
2530 resume_info
.kind
= resume_continue
;
2531 resume_info
.sig
= 0;
2532 linux_resume (&resume_info
, 1);
2538 if (ptid_equal (step_over_bkpt
, null_ptid
))
2539 pid
= linux_wait_for_event (ptid
, &w
, options
);
2543 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2544 target_pid_to_str (step_over_bkpt
));
2545 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2550 gdb_assert (target_options
& TARGET_WNOHANG
);
2554 debug_printf ("linux_wait_1 ret = null_ptid, "
2555 "TARGET_WAITKIND_IGNORE\n");
2559 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2566 debug_printf ("linux_wait_1 ret = null_ptid, "
2567 "TARGET_WAITKIND_NO_RESUMED\n");
2571 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2575 event_child
= get_thread_lwp (current_inferior
);
2577 /* linux_wait_for_event only returns an exit status for the last
2578 child of a process. Report it. */
2579 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2583 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2584 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2588 debug_printf ("linux_wait_1 ret = %s, exited with "
2590 target_pid_to_str (ptid_of (current_inferior
)),
2597 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2598 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2602 debug_printf ("linux_wait_1 ret = %s, terminated with "
2604 target_pid_to_str (ptid_of (current_inferior
)),
2610 return ptid_of (current_inferior
);
2613 /* If this event was not handled before, and is not a SIGTRAP, we
2614 report it. SIGILL and SIGSEGV are also treated as traps in case
2615 a breakpoint is inserted at the current PC. If this target does
2616 not support internal breakpoints at all, we also report the
2617 SIGTRAP without further processing; it's of no concern to us. */
2619 = (supports_breakpoints ()
2620 && (WSTOPSIG (w
) == SIGTRAP
2621 || ((WSTOPSIG (w
) == SIGILL
2622 || WSTOPSIG (w
) == SIGSEGV
)
2623 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2625 if (maybe_internal_trap
)
2627 /* Handle anything that requires bookkeeping before deciding to
2628 report the event or continue waiting. */
2630 /* First check if we can explain the SIGTRAP with an internal
2631 breakpoint, or if we should possibly report the event to GDB.
2632 Do this before anything that may remove or insert a
2634 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2636 /* We have a SIGTRAP, possibly a step-over dance has just
2637 finished. If so, tweak the state machine accordingly,
2638 reinsert breakpoints and delete any reinsert (software
2639 single-step) breakpoints. */
2640 step_over_finished
= finish_step_over (event_child
);
2642 /* Now invoke the callbacks of any internal breakpoints there. */
2643 check_breakpoints (event_child
->stop_pc
);
2645 /* Handle tracepoint data collecting. This may overflow the
2646 trace buffer, and cause a tracing stop, removing
2648 trace_event
= handle_tracepoints (event_child
);
2650 if (bp_explains_trap
)
2652 /* If we stepped or ran into an internal breakpoint, we've
2653 already handled it. So next time we resume (from this
2654 PC), we should step over it. */
2656 debug_printf ("Hit a gdbserver breakpoint.\n");
2658 if (breakpoint_here (event_child
->stop_pc
))
2659 event_child
->need_step_over
= 1;
2664 /* We have some other signal, possibly a step-over dance was in
2665 progress, and it should be cancelled too. */
2666 step_over_finished
= finish_step_over (event_child
);
2669 /* We have all the data we need. Either report the event to GDB, or
2670 resume threads and keep waiting for more. */
2672 /* If we're collecting a fast tracepoint, finish the collection and
2673 move out of the jump pad before delivering a signal. See
2674 linux_stabilize_threads. */
2677 && WSTOPSIG (w
) != SIGTRAP
2678 && supports_fast_tracepoints ()
2679 && agent_loaded_p ())
2682 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2683 "to defer or adjust it.\n",
2684 WSTOPSIG (w
), lwpid_of (current_inferior
));
2686 /* Allow debugging the jump pad itself. */
2687 if (current_inferior
->last_resume_kind
!= resume_step
2688 && maybe_move_out_of_jump_pad (event_child
, &w
))
2690 enqueue_one_deferred_signal (event_child
, &w
);
2693 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2694 WSTOPSIG (w
), lwpid_of (current_inferior
));
2696 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2701 if (event_child
->collecting_fast_tracepoint
)
2704 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2705 "Check if we're already there.\n",
2706 lwpid_of (current_inferior
),
2707 event_child
->collecting_fast_tracepoint
);
2711 event_child
->collecting_fast_tracepoint
2712 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2714 if (event_child
->collecting_fast_tracepoint
!= 1)
2716 /* No longer need this breakpoint. */
2717 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2720 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2721 "stopping all threads momentarily.\n");
2723 /* Other running threads could hit this breakpoint.
2724 We don't handle moribund locations like GDB does,
2725 instead we always pause all threads when removing
2726 breakpoints, so that any step-over or
2727 decr_pc_after_break adjustment is always taken
2728 care of while the breakpoint is still
2730 stop_all_lwps (1, event_child
);
2731 cancel_breakpoints ();
2733 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2734 event_child
->exit_jump_pad_bkpt
= NULL
;
2736 unstop_all_lwps (1, event_child
);
2738 gdb_assert (event_child
->suspended
>= 0);
2742 if (event_child
->collecting_fast_tracepoint
== 0)
2745 debug_printf ("fast tracepoint finished "
2746 "collecting successfully.\n");
2748 /* We may have a deferred signal to report. */
2749 if (dequeue_one_deferred_signal (event_child
, &w
))
2752 debug_printf ("dequeued one signal.\n");
2757 debug_printf ("no deferred signals.\n");
2759 if (stabilizing_threads
)
2761 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2762 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2766 debug_printf ("linux_wait_1 ret = %s, stopped "
2767 "while stabilizing threads\n",
2768 target_pid_to_str (ptid_of (current_inferior
)));
2772 return ptid_of (current_inferior
);
2778 /* Check whether GDB would be interested in this event. */
2780 /* If GDB is not interested in this signal, don't stop other
2781 threads, and don't report it to GDB. Just resume the inferior
2782 right away. We do this for threading-related signals as well as
2783 any that GDB specifically requested we ignore. But never ignore
2784 SIGSTOP if we sent it ourselves, and do not ignore signals when
2785 stepping - they may require special handling to skip the signal
2787 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2790 && current_inferior
->last_resume_kind
!= resume_step
2792 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2793 (current_process ()->private->thread_db
!= NULL
2794 && (WSTOPSIG (w
) == __SIGRTMIN
2795 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2798 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2799 && !(WSTOPSIG (w
) == SIGSTOP
2800 && current_inferior
->last_resume_kind
== resume_stop
))))
2802 siginfo_t info
, *info_p
;
2805 debug_printf ("Ignored signal %d for LWP %ld.\n",
2806 WSTOPSIG (w
), lwpid_of (current_inferior
));
2808 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
2809 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2813 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2814 WSTOPSIG (w
), info_p
);
2818 /* Note that all addresses are always "out of the step range" when
2819 there's no range to begin with. */
2820 in_step_range
= lwp_in_step_range (event_child
);
2822 /* If GDB wanted this thread to single step, and the thread is out
2823 of the step range, we always want to report the SIGTRAP, and let
2824 GDB handle it. Watchpoints should always be reported. So should
2825 signals we can't explain. A SIGTRAP we can't explain could be a
2826 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2827 do, we're be able to handle GDB breakpoints on top of internal
2828 breakpoints, by handling the internal breakpoint and still
2829 reporting the event to GDB. If we don't, we're out of luck, GDB
2830 won't see the breakpoint hit. */
2831 report_to_gdb
= (!maybe_internal_trap
2832 || (current_inferior
->last_resume_kind
== resume_step
2834 || event_child
->stopped_by_watchpoint
2835 || (!step_over_finished
&& !in_step_range
2836 && !bp_explains_trap
&& !trace_event
)
2837 || (gdb_breakpoint_here (event_child
->stop_pc
)
2838 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2839 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2841 run_breakpoint_commands (event_child
->stop_pc
);
2843 /* We found no reason GDB would want us to stop. We either hit one
2844 of our own breakpoints, or finished an internal step GDB
2845 shouldn't know about. */
2850 if (bp_explains_trap
)
2851 debug_printf ("Hit a gdbserver breakpoint.\n");
2852 if (step_over_finished
)
2853 debug_printf ("Step-over finished.\n");
2855 debug_printf ("Tracepoint event.\n");
2856 if (lwp_in_step_range (event_child
))
2857 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2858 paddress (event_child
->stop_pc
),
2859 paddress (event_child
->step_range_start
),
2860 paddress (event_child
->step_range_end
));
2863 /* We're not reporting this breakpoint to GDB, so apply the
2864 decr_pc_after_break adjustment to the inferior's regcache
2867 if (the_low_target
.set_pc
!= NULL
)
2869 struct regcache
*regcache
2870 = get_thread_regcache (current_inferior
, 1);
2871 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2874 /* We may have finished stepping over a breakpoint. If so,
2875 we've stopped and suspended all LWPs momentarily except the
2876 stepping one. This is where we resume them all again. We're
2877 going to keep waiting, so use proceed, which handles stepping
2878 over the next breakpoint. */
2880 debug_printf ("proceeding all threads.\n");
2882 if (step_over_finished
)
2883 unsuspend_all_lwps (event_child
);
2885 proceed_all_lwps ();
2891 if (current_inferior
->last_resume_kind
== resume_step
)
2893 if (event_child
->step_range_start
== event_child
->step_range_end
)
2894 debug_printf ("GDB wanted to single-step, reporting event.\n");
2895 else if (!lwp_in_step_range (event_child
))
2896 debug_printf ("Out of step range, reporting event.\n");
2898 if (event_child
->stopped_by_watchpoint
)
2899 debug_printf ("Stopped by watchpoint.\n");
2900 if (gdb_breakpoint_here (event_child
->stop_pc
))
2901 debug_printf ("Stopped by GDB breakpoint.\n");
2903 debug_printf ("Hit a non-gdbserver trap event.\n");
2906 /* Alright, we're going to report a stop. */
2908 if (!non_stop
&& !stabilizing_threads
)
2910 /* In all-stop, stop all threads. */
2911 stop_all_lwps (0, NULL
);
2913 /* If we're not waiting for a specific LWP, choose an event LWP
2914 from among those that have had events. Giving equal priority
2915 to all LWPs that have had events helps prevent
2917 if (ptid_equal (ptid
, minus_one_ptid
))
2919 event_child
->status_pending_p
= 1;
2920 event_child
->status_pending
= w
;
2922 select_event_lwp (&event_child
);
2924 /* current_inferior and event_child must stay in sync. */
2925 current_inferior
= get_lwp_thread (event_child
);
2927 event_child
->status_pending_p
= 0;
2928 w
= event_child
->status_pending
;
2931 /* Now that we've selected our final event LWP, cancel any
2932 breakpoints in other LWPs that have hit a GDB breakpoint.
2933 See the comment in cancel_breakpoints_callback to find out
2935 find_inferior (&all_threads
, cancel_breakpoints_callback
, event_child
);
2937 /* If we were going a step-over, all other threads but the stepping one
2938 had been paused in start_step_over, with their suspend counts
2939 incremented. We don't want to do a full unstop/unpause, because we're
2940 in all-stop mode (so we want threads stopped), but we still need to
2941 unsuspend the other threads, to decrement their `suspended' count
2943 if (step_over_finished
)
2944 unsuspend_all_lwps (event_child
);
2946 /* Stabilize threads (move out of jump pads). */
2947 stabilize_threads ();
2951 /* If we just finished a step-over, then all threads had been
2952 momentarily paused. In all-stop, that's fine, we want
2953 threads stopped by now anyway. In non-stop, we need to
2954 re-resume threads that GDB wanted to be running. */
2955 if (step_over_finished
)
2956 unstop_all_lwps (1, event_child
);
2959 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2961 if (current_inferior
->last_resume_kind
== resume_stop
2962 && WSTOPSIG (w
) == SIGSTOP
)
2964 /* A thread that has been requested to stop by GDB with vCont;t,
2965 and it stopped cleanly, so report as SIG0. The use of
2966 SIGSTOP is an implementation detail. */
2967 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2969 else if (current_inferior
->last_resume_kind
== resume_stop
2970 && WSTOPSIG (w
) != SIGSTOP
)
2972 /* A thread that has been requested to stop by GDB with vCont;t,
2973 but, it stopped for other reasons. */
2974 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2978 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2981 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2985 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2986 target_pid_to_str (ptid_of (current_inferior
)),
2987 ourstatus
->kind
, ourstatus
->value
.sig
);
2991 return ptid_of (current_inferior
);
2994 /* Get rid of any pending event in the pipe. */
2996 async_file_flush (void)
3002 ret
= read (linux_event_pipe
[0], &buf
, 1);
3003 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3006 /* Put something in the pipe, so the event loop wakes up. */
3008 async_file_mark (void)
3012 async_file_flush ();
3015 ret
= write (linux_event_pipe
[1], "+", 1);
3016 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3018 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3019 be awakened anyway. */
3023 linux_wait (ptid_t ptid
,
3024 struct target_waitstatus
*ourstatus
, int target_options
)
3028 /* Flush the async file first. */
3029 if (target_is_async_p ())
3030 async_file_flush ();
3032 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3034 /* If at least one stop was reported, there may be more. A single
3035 SIGCHLD can signal more than one child stop. */
3036 if (target_is_async_p ()
3037 && (target_options
& TARGET_WNOHANG
) != 0
3038 && !ptid_equal (event_ptid
, null_ptid
))
3044 /* Send a signal to an LWP. */
3047 kill_lwp (unsigned long lwpid
, int signo
)
3049 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3050 fails, then we are not using nptl threads and we should be using kill. */
3054 static int tkill_failed
;
3061 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3062 if (errno
!= ENOSYS
)
3069 return kill (lwpid
, signo
);
3073 linux_stop_lwp (struct lwp_info
*lwp
)
3079 send_sigstop (struct lwp_info
*lwp
)
3083 pid
= lwpid_of (get_lwp_thread (lwp
));
3085 /* If we already have a pending stop signal for this process, don't
3087 if (lwp
->stop_expected
)
3090 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3096 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3098 lwp
->stop_expected
= 1;
3099 kill_lwp (pid
, SIGSTOP
);
3103 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3105 struct thread_info
*thread
= (struct thread_info
*) entry
;
3106 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3108 /* Ignore EXCEPT. */
3119 /* Increment the suspend count of an LWP, and stop it, if not stopped
3122 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3125 struct thread_info
*thread
= (struct thread_info
*) entry
;
3126 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3128 /* Ignore EXCEPT. */
3134 return send_sigstop_callback (entry
, except
);
3138 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3140 /* It's dead, really. */
3143 /* Store the exit status for later. */
3144 lwp
->status_pending_p
= 1;
3145 lwp
->status_pending
= wstat
;
3147 /* Prevent trying to stop it. */
3150 /* No further stops are expected from a dead lwp. */
3151 lwp
->stop_expected
= 0;
3154 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3157 wait_for_sigstop (void)
3159 struct thread_info
*saved_inferior
;
3164 saved_inferior
= current_inferior
;
3165 if (saved_inferior
!= NULL
)
3166 saved_tid
= saved_inferior
->entry
.id
;
3168 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3171 debug_printf ("wait_for_sigstop: pulling events\n");
3173 /* Passing NULL_PTID as filter indicates we want all events to be
3174 left pending. Eventually this returns when there are no
3175 unwaited-for children left. */
3176 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3178 gdb_assert (ret
== -1);
3180 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3181 current_inferior
= saved_inferior
;
3185 debug_printf ("Previously current thread died.\n");
3189 /* We can't change the current inferior behind GDB's back,
3190 otherwise, a subsequent command may apply to the wrong
3192 current_inferior
= NULL
;
3196 /* Set a valid thread as current. */
3197 set_desired_inferior (0);
3202 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3203 move it out, because we need to report the stop event to GDB. For
3204 example, if the user puts a breakpoint in the jump pad, it's
3205 because she wants to debug it. */
3208 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3210 struct thread_info
*thread
= (struct thread_info
*) entry
;
3211 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3213 gdb_assert (lwp
->suspended
== 0);
3214 gdb_assert (lwp
->stopped
);
3216 /* Allow debugging the jump pad, gdb_collect, etc.. */
3217 return (supports_fast_tracepoints ()
3218 && agent_loaded_p ()
3219 && (gdb_breakpoint_here (lwp
->stop_pc
)
3220 || lwp
->stopped_by_watchpoint
3221 || thread
->last_resume_kind
== resume_step
)
3222 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3226 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3228 struct thread_info
*thread
= (struct thread_info
*) entry
;
3229 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3232 gdb_assert (lwp
->suspended
== 0);
3233 gdb_assert (lwp
->stopped
);
3235 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3237 /* Allow debugging the jump pad, gdb_collect, etc. */
3238 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3239 && !lwp
->stopped_by_watchpoint
3240 && thread
->last_resume_kind
!= resume_step
3241 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3244 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3249 lwp
->status_pending_p
= 0;
3250 enqueue_one_deferred_signal (lwp
, wstat
);
3253 debug_printf ("Signal %d for LWP %ld deferred "
3255 WSTOPSIG (*wstat
), lwpid_of (thread
));
3258 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3265 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3267 struct thread_info
*thread
= (struct thread_info
*) entry
;
3268 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3277 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3278 If SUSPEND, then also increase the suspend count of every LWP,
3282 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3284 /* Should not be called recursively. */
3285 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3290 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3291 suspend
? "stop-and-suspend" : "stop",
3293 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3297 stopping_threads
= (suspend
3298 ? STOPPING_AND_SUSPENDING_THREADS
3299 : STOPPING_THREADS
);
3302 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3304 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3305 wait_for_sigstop ();
3306 stopping_threads
= NOT_STOPPING_THREADS
;
3310 debug_printf ("stop_all_lwps done, setting stopping_threads "
3311 "back to !stopping\n");
3316 /* Resume execution of the inferior process.
3317 If STEP is nonzero, single-step it.
3318 If SIGNAL is nonzero, give it that signal. */
3321 linux_resume_one_lwp (struct lwp_info
*lwp
,
3322 int step
, int signal
, siginfo_t
*info
)
3324 struct thread_info
*thread
= get_lwp_thread (lwp
);
3325 struct thread_info
*saved_inferior
;
3326 int fast_tp_collecting
;
3328 if (lwp
->stopped
== 0)
3331 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3333 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3335 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3336 user used the "jump" command, or "set $pc = foo"). */
3337 if (lwp
->stop_pc
!= get_pc (lwp
))
3339 /* Collecting 'while-stepping' actions doesn't make sense
3341 release_while_stepping_state_list (thread
);
3344 /* If we have pending signals or status, and a new signal, enqueue the
3345 signal. Also enqueue the signal if we are waiting to reinsert a
3346 breakpoint; it will be picked up again below. */
3348 && (lwp
->status_pending_p
3349 || lwp
->pending_signals
!= NULL
3350 || lwp
->bp_reinsert
!= 0
3351 || fast_tp_collecting
))
3353 struct pending_signals
*p_sig
;
3354 p_sig
= xmalloc (sizeof (*p_sig
));
3355 p_sig
->prev
= lwp
->pending_signals
;
3356 p_sig
->signal
= signal
;
3358 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3360 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3361 lwp
->pending_signals
= p_sig
;
3364 if (lwp
->status_pending_p
)
3367 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3368 " has pending status\n",
3369 lwpid_of (thread
), step
? "step" : "continue", signal
,
3370 lwp
->stop_expected
? "expected" : "not expected");
3374 saved_inferior
= current_inferior
;
3375 current_inferior
= thread
;
3378 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3379 lwpid_of (thread
), step
? "step" : "continue", signal
,
3380 lwp
->stop_expected
? "expected" : "not expected");
3382 /* This bit needs some thinking about. If we get a signal that
3383 we must report while a single-step reinsert is still pending,
3384 we often end up resuming the thread. It might be better to
3385 (ew) allow a stack of pending events; then we could be sure that
3386 the reinsert happened right away and not lose any signals.
3388 Making this stack would also shrink the window in which breakpoints are
3389 uninserted (see comment in linux_wait_for_lwp) but not enough for
3390 complete correctness, so it won't solve that problem. It may be
3391 worthwhile just to solve this one, however. */
3392 if (lwp
->bp_reinsert
!= 0)
3395 debug_printf (" pending reinsert at 0x%s\n",
3396 paddress (lwp
->bp_reinsert
));
3398 if (can_hardware_single_step ())
3400 if (fast_tp_collecting
== 0)
3403 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3405 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3412 /* Postpone any pending signal. It was enqueued above. */
3416 if (fast_tp_collecting
== 1)
3419 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3420 " (exit-jump-pad-bkpt)\n",
3423 /* Postpone any pending signal. It was enqueued above. */
3426 else if (fast_tp_collecting
== 2)
3429 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3430 " single-stepping\n",
3433 if (can_hardware_single_step ())
3436 fatal ("moving out of jump pad single-stepping"
3437 " not implemented on this target");
3439 /* Postpone any pending signal. It was enqueued above. */
3443 /* If we have while-stepping actions in this thread set it stepping.
3444 If we have a signal to deliver, it may or may not be set to
3445 SIG_IGN, we don't know. Assume so, and allow collecting
3446 while-stepping into a signal handler. A possible smart thing to
3447 do would be to set an internal breakpoint at the signal return
3448 address, continue, and carry on catching this while-stepping
3449 action only when that breakpoint is hit. A future
3451 if (thread
->while_stepping
!= NULL
3452 && can_hardware_single_step ())
3455 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3460 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3462 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3463 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3464 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3467 /* If we have pending signals, consume one unless we are trying to
3468 reinsert a breakpoint or we're trying to finish a fast tracepoint
3470 if (lwp
->pending_signals
!= NULL
3471 && lwp
->bp_reinsert
== 0
3472 && fast_tp_collecting
== 0)
3474 struct pending_signals
**p_sig
;
3476 p_sig
= &lwp
->pending_signals
;
3477 while ((*p_sig
)->prev
!= NULL
)
3478 p_sig
= &(*p_sig
)->prev
;
3480 signal
= (*p_sig
)->signal
;
3481 if ((*p_sig
)->info
.si_signo
!= 0)
3482 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3489 if (the_low_target
.prepare_to_resume
!= NULL
)
3490 the_low_target
.prepare_to_resume (lwp
);
3492 regcache_invalidate_thread (thread
);
3495 lwp
->stopped_by_watchpoint
= 0;
3496 lwp
->stepping
= step
;
3497 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3498 (PTRACE_TYPE_ARG3
) 0,
3499 /* Coerce to a uintptr_t first to avoid potential gcc warning
3500 of coercing an 8 byte integer to a 4 byte pointer. */
3501 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3503 current_inferior
= saved_inferior
;
3506 /* ESRCH from ptrace either means that the thread was already
3507 running (an error) or that it is gone (a race condition). If
3508 it's gone, we will get a notification the next time we wait,
3509 so we can ignore the error. We could differentiate these
3510 two, but it's tricky without waiting; the thread still exists
3511 as a zombie, so sending it signal 0 would succeed. So just
3516 perror_with_name ("ptrace");
3520 struct thread_resume_array
3522 struct thread_resume
*resume
;
3526 /* This function is called once per thread via find_inferior.
3527 ARG is a pointer to a thread_resume_array struct.
3528 We look up the thread specified by ENTRY in ARG, and mark the thread
3529 with a pointer to the appropriate resume request.
3531 This algorithm is O(threads * resume elements), but resume elements
3532 is small (and will remain small at least until GDB supports thread
3536 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3538 struct thread_info
*thread
= (struct thread_info
*) entry
;
3539 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3541 struct thread_resume_array
*r
;
3545 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3547 ptid_t ptid
= r
->resume
[ndx
].thread
;
3548 if (ptid_equal (ptid
, minus_one_ptid
)
3549 || ptid_equal (ptid
, entry
->id
)
3550 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3552 || (ptid_get_pid (ptid
) == pid_of (thread
)
3553 && (ptid_is_pid (ptid
)
3554 || ptid_get_lwp (ptid
) == -1)))
3556 if (r
->resume
[ndx
].kind
== resume_stop
3557 && thread
->last_resume_kind
== resume_stop
)
3560 debug_printf ("already %s LWP %ld at GDB's request\n",
3561 (thread
->last_status
.kind
3562 == TARGET_WAITKIND_STOPPED
)
3570 lwp
->resume
= &r
->resume
[ndx
];
3571 thread
->last_resume_kind
= lwp
->resume
->kind
;
3573 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3574 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3576 /* If we had a deferred signal to report, dequeue one now.
3577 This can happen if LWP gets more than one signal while
3578 trying to get out of a jump pad. */
3580 && !lwp
->status_pending_p
3581 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3583 lwp
->status_pending_p
= 1;
3586 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3587 "leaving status pending.\n",
3588 WSTOPSIG (lwp
->status_pending
),
3596 /* No resume action for this thread. */
3602 /* find_inferior callback for linux_resume.
3603 Set *FLAG_P if this lwp has an interesting status pending. */
3606 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3608 struct thread_info
*thread
= (struct thread_info
*) entry
;
3609 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3611 /* LWPs which will not be resumed are not interesting, because
3612 we might not wait for them next time through linux_wait. */
3613 if (lwp
->resume
== NULL
)
3616 if (lwp
->status_pending_p
)
3617 * (int *) flag_p
= 1;
3622 /* Return 1 if this lwp that GDB wants running is stopped at an
3623 internal breakpoint that we need to step over. It assumes that any
3624 required STOP_PC adjustment has already been propagated to the
3625 inferior's regcache. */
3628 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3630 struct thread_info
*thread
= (struct thread_info
*) entry
;
3631 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3632 struct thread_info
*saved_inferior
;
3635 /* LWPs which will not be resumed are not interesting, because we
3636 might not wait for them next time through linux_wait. */
3641 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3646 if (thread
->last_resume_kind
== resume_stop
)
3649 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3655 gdb_assert (lwp
->suspended
>= 0);
3660 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3665 if (!lwp
->need_step_over
)
3668 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3671 if (lwp
->status_pending_p
)
3674 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3680 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3684 /* If the PC has changed since we stopped, then don't do anything,
3685 and let the breakpoint/tracepoint be hit. This happens if, for
3686 instance, GDB handled the decr_pc_after_break subtraction itself,
3687 GDB is OOL stepping this thread, or the user has issued a "jump"
3688 command, or poked thread's registers herself. */
3689 if (pc
!= lwp
->stop_pc
)
3692 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3693 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3695 paddress (lwp
->stop_pc
), paddress (pc
));
3697 lwp
->need_step_over
= 0;
3701 saved_inferior
= current_inferior
;
3702 current_inferior
= thread
;
3704 /* We can only step over breakpoints we know about. */
3705 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3707 /* Don't step over a breakpoint that GDB expects to hit
3708 though. If the condition is being evaluated on the target's side
3709 and it evaluate to false, step over this breakpoint as well. */
3710 if (gdb_breakpoint_here (pc
)
3711 && gdb_condition_true_at_breakpoint (pc
)
3712 && gdb_no_commands_at_breakpoint (pc
))
3715 debug_printf ("Need step over [LWP %ld]? yes, but found"
3716 " GDB breakpoint at 0x%s; skipping step over\n",
3717 lwpid_of (thread
), paddress (pc
));
3719 current_inferior
= saved_inferior
;
3725 debug_printf ("Need step over [LWP %ld]? yes, "
3726 "found breakpoint at 0x%s\n",
3727 lwpid_of (thread
), paddress (pc
));
3729 /* We've found an lwp that needs stepping over --- return 1 so
3730 that find_inferior stops looking. */
3731 current_inferior
= saved_inferior
;
3733 /* If the step over is cancelled, this is set again. */
3734 lwp
->need_step_over
= 0;
3739 current_inferior
= saved_inferior
;
3742 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3744 lwpid_of (thread
), paddress (pc
));
3749 /* Start a step-over operation on LWP. When LWP stopped at a
3750 breakpoint, to make progress, we need to remove the breakpoint out
3751 of the way. If we let other threads run while we do that, they may
3752 pass by the breakpoint location and miss hitting it. To avoid
3753 that, a step-over momentarily stops all threads while LWP is
3754 single-stepped while the breakpoint is temporarily uninserted from
3755 the inferior. When the single-step finishes, we reinsert the
3756 breakpoint, and let all threads that are supposed to be running,
3759 On targets that don't support hardware single-step, we don't
3760 currently support full software single-stepping. Instead, we only
3761 support stepping over the thread event breakpoint, by asking the
3762 low target where to place a reinsert breakpoint. Since this
3763 routine assumes the breakpoint being stepped over is a thread event
3764 breakpoint, it usually assumes the return address of the current
3765 function is a good enough place to set the reinsert breakpoint. */
3768 start_step_over (struct lwp_info
*lwp
)
3770 struct thread_info
*thread
= get_lwp_thread (lwp
);
3771 struct thread_info
*saved_inferior
;
3776 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3779 stop_all_lwps (1, lwp
);
3780 gdb_assert (lwp
->suspended
== 0);
3783 debug_printf ("Done stopping all threads for step-over.\n");
3785 /* Note, we should always reach here with an already adjusted PC,
3786 either by GDB (if we're resuming due to GDB's request), or by our
3787 caller, if we just finished handling an internal breakpoint GDB
3788 shouldn't care about. */
3791 saved_inferior
= current_inferior
;
3792 current_inferior
= thread
;
3794 lwp
->bp_reinsert
= pc
;
3795 uninsert_breakpoints_at (pc
);
3796 uninsert_fast_tracepoint_jumps_at (pc
);
3798 if (can_hardware_single_step ())
3804 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3805 set_reinsert_breakpoint (raddr
);
3809 current_inferior
= saved_inferior
;
3811 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3813 /* Require next event from this LWP. */
3814 step_over_bkpt
= thread
->entry
.id
;
3818 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3819 start_step_over, if still there, and delete any reinsert
3820 breakpoints we've set, on non hardware single-step targets. */
3823 finish_step_over (struct lwp_info
*lwp
)
3825 if (lwp
->bp_reinsert
!= 0)
3828 debug_printf ("Finished step over.\n");
3830 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3831 may be no breakpoint to reinsert there by now. */
3832 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3833 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3835 lwp
->bp_reinsert
= 0;
3837 /* Delete any software-single-step reinsert breakpoints. No
3838 longer needed. We don't have to worry about other threads
3839 hitting this trap, and later not being able to explain it,
3840 because we were stepping over a breakpoint, and we hold all
3841 threads but LWP stopped while doing that. */
3842 if (!can_hardware_single_step ())
3843 delete_reinsert_breakpoints ();
3845 step_over_bkpt
= null_ptid
;
3852 /* This function is called once per thread. We check the thread's resume
3853 request, which will tell us whether to resume, step, or leave the thread
3854 stopped; and what signal, if any, it should be sent.
3856 For threads which we aren't explicitly told otherwise, we preserve
3857 the stepping flag; this is used for stepping over gdbserver-placed
3860 If pending_flags was set in any thread, we queue any needed
3861 signals, since we won't actually resume. We already have a pending
3862 event to report, so we don't need to preserve any step requests;
3863 they should be re-issued if necessary. */
3866 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3868 struct thread_info
*thread
= (struct thread_info
*) entry
;
3869 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3871 int leave_all_stopped
= * (int *) arg
;
3874 if (lwp
->resume
== NULL
)
3877 if (lwp
->resume
->kind
== resume_stop
)
3880 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3885 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3887 /* Stop the thread, and wait for the event asynchronously,
3888 through the event loop. */
3894 debug_printf ("already stopped LWP %ld\n",
3897 /* The LWP may have been stopped in an internal event that
3898 was not meant to be notified back to GDB (e.g., gdbserver
3899 breakpoint), so we should be reporting a stop event in
3902 /* If the thread already has a pending SIGSTOP, this is a
3903 no-op. Otherwise, something later will presumably resume
3904 the thread and this will cause it to cancel any pending
3905 operation, due to last_resume_kind == resume_stop. If
3906 the thread already has a pending status to report, we
3907 will still report it the next time we wait - see
3908 status_pending_p_callback. */
3910 /* If we already have a pending signal to report, then
3911 there's no need to queue a SIGSTOP, as this means we're
3912 midway through moving the LWP out of the jumppad, and we
3913 will report the pending signal as soon as that is
3915 if (lwp
->pending_signals_to_report
== NULL
)
3919 /* For stop requests, we're done. */
3921 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3925 /* If this thread which is about to be resumed has a pending status,
3926 then don't resume any threads - we can just report the pending
3927 status. Make sure to queue any signals that would otherwise be
3928 sent. In all-stop mode, we do this decision based on if *any*
3929 thread has a pending status. If there's a thread that needs the
3930 step-over-breakpoint dance, then don't resume any other thread
3931 but that particular one. */
3932 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3937 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3939 step
= (lwp
->resume
->kind
== resume_step
);
3940 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3945 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3947 /* If we have a new signal, enqueue the signal. */
3948 if (lwp
->resume
->sig
!= 0)
3950 struct pending_signals
*p_sig
;
3951 p_sig
= xmalloc (sizeof (*p_sig
));
3952 p_sig
->prev
= lwp
->pending_signals
;
3953 p_sig
->signal
= lwp
->resume
->sig
;
3954 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3956 /* If this is the same signal we were previously stopped by,
3957 make sure to queue its siginfo. We can ignore the return
3958 value of ptrace; if it fails, we'll skip
3959 PTRACE_SETSIGINFO. */
3960 if (WIFSTOPPED (lwp
->last_status
)
3961 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3962 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3965 lwp
->pending_signals
= p_sig
;
3969 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3975 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3977 struct thread_resume_array array
= { resume_info
, n
};
3978 struct thread_info
*need_step_over
= NULL
;
3980 int leave_all_stopped
;
3985 debug_printf ("linux_resume:\n");
3988 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3990 /* If there is a thread which would otherwise be resumed, which has
3991 a pending status, then don't resume any threads - we can just
3992 report the pending status. Make sure to queue any signals that
3993 would otherwise be sent. In non-stop mode, we'll apply this
3994 logic to each thread individually. We consume all pending events
3995 before considering to start a step-over (in all-stop). */
3998 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4000 /* If there is a thread which would otherwise be resumed, which is
4001 stopped at a breakpoint that needs stepping over, then don't
4002 resume any threads - have it step over the breakpoint with all
4003 other threads stopped, then resume all threads again. Make sure
4004 to queue any signals that would otherwise be delivered or
4006 if (!any_pending
&& supports_breakpoints ())
4008 = (struct thread_info
*) find_inferior (&all_threads
,
4009 need_step_over_p
, NULL
);
4011 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4015 if (need_step_over
!= NULL
)
4016 debug_printf ("Not resuming all, need step over\n");
4017 else if (any_pending
)
4018 debug_printf ("Not resuming, all-stop and found "
4019 "an LWP with pending status\n");
4021 debug_printf ("Resuming, no pending status or step over needed\n");
4024 /* Even if we're leaving threads stopped, queue all signals we'd
4025 otherwise deliver. */
4026 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4029 start_step_over (get_thread_lwp (need_step_over
));
4033 debug_printf ("linux_resume done\n");
4038 /* This function is called once per thread. We check the thread's
4039 last resume request, which will tell us whether to resume, step, or
4040 leave the thread stopped. Any signal the client requested to be
4041 delivered has already been enqueued at this point.
4043 If any thread that GDB wants running is stopped at an internal
4044 breakpoint that needs stepping over, we start a step-over operation
4045 on that particular thread, and leave all others stopped. */
4048 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4050 struct thread_info
*thread
= (struct thread_info
*) entry
;
4051 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4058 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4063 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4067 if (thread
->last_resume_kind
== resume_stop
4068 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4071 debug_printf (" client wants LWP to remain %ld stopped\n",
4076 if (lwp
->status_pending_p
)
4079 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4084 gdb_assert (lwp
->suspended
>= 0);
4089 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4093 if (thread
->last_resume_kind
== resume_stop
4094 && lwp
->pending_signals_to_report
== NULL
4095 && lwp
->collecting_fast_tracepoint
== 0)
4097 /* We haven't reported this LWP as stopped yet (otherwise, the
4098 last_status.kind check above would catch it, and we wouldn't
4099 reach here. This LWP may have been momentarily paused by a
4100 stop_all_lwps call while handling for example, another LWP's
4101 step-over. In that case, the pending expected SIGSTOP signal
4102 that was queued at vCont;t handling time will have already
4103 been consumed by wait_for_sigstop, and so we need to requeue
4104 another one here. Note that if the LWP already has a SIGSTOP
4105 pending, this is a no-op. */
4108 debug_printf ("Client wants LWP %ld to stop. "
4109 "Making sure it has a SIGSTOP pending\n",
4115 step
= thread
->last_resume_kind
== resume_step
;
4116 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4121 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4123 struct thread_info
*thread
= (struct thread_info
*) entry
;
4124 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4130 gdb_assert (lwp
->suspended
>= 0);
4132 return proceed_one_lwp (entry
, except
);
4135 /* When we finish a step-over, set threads running again. If there's
4136 another thread that may need a step-over, now's the time to start
4137 it. Eventually, we'll move all threads past their breakpoints. */
4140 proceed_all_lwps (void)
4142 struct thread_info
*need_step_over
;
4144 /* If there is a thread which would otherwise be resumed, which is
4145 stopped at a breakpoint that needs stepping over, then don't
4146 resume any threads - have it step over the breakpoint with all
4147 other threads stopped, then resume all threads again. */
4149 if (supports_breakpoints ())
4152 = (struct thread_info
*) find_inferior (&all_threads
,
4153 need_step_over_p
, NULL
);
4155 if (need_step_over
!= NULL
)
4158 debug_printf ("proceed_all_lwps: found "
4159 "thread %ld needing a step-over\n",
4160 lwpid_of (need_step_over
));
4162 start_step_over (get_thread_lwp (need_step_over
));
4168 debug_printf ("Proceeding, no step-over needed\n");
4170 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4173 /* Stopped LWPs that the client wanted to be running, that don't have
4174 pending statuses, are set to run again, except for EXCEPT, if not
4175 NULL. This undoes a stop_all_lwps call. */
4178 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4184 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4185 lwpid_of (get_lwp_thread (except
)));
4187 debug_printf ("unstopping all lwps\n");
4191 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4193 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4197 debug_printf ("unstop_all_lwps done\n");
4203 #ifdef HAVE_LINUX_REGSETS
4205 #define use_linux_regsets 1
4207 /* Returns true if REGSET has been disabled. */
4210 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4212 return (info
->disabled_regsets
!= NULL
4213 && info
->disabled_regsets
[regset
- info
->regsets
]);
4216 /* Disable REGSET. */
4219 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4223 dr_offset
= regset
- info
->regsets
;
4224 if (info
->disabled_regsets
== NULL
)
4225 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4226 info
->disabled_regsets
[dr_offset
] = 1;
4230 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4231 struct regcache
*regcache
)
4233 struct regset_info
*regset
;
4234 int saw_general_regs
= 0;
4238 regset
= regsets_info
->regsets
;
4240 pid
= lwpid_of (current_inferior
);
4241 while (regset
->size
>= 0)
4246 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4252 buf
= xmalloc (regset
->size
);
4254 nt_type
= regset
->nt_type
;
4258 iov
.iov_len
= regset
->size
;
4259 data
= (void *) &iov
;
4265 res
= ptrace (regset
->get_request
, pid
,
4266 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4268 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4274 /* If we get EIO on a regset, do not try it again for
4275 this process mode. */
4276 disable_regset (regsets_info
, regset
);
4283 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4288 else if (regset
->type
== GENERAL_REGS
)
4289 saw_general_regs
= 1;
4290 regset
->store_function (regcache
, buf
);
4294 if (saw_general_regs
)
4301 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4302 struct regcache
*regcache
)
4304 struct regset_info
*regset
;
4305 int saw_general_regs
= 0;
4309 regset
= regsets_info
->regsets
;
4311 pid
= lwpid_of (current_inferior
);
4312 while (regset
->size
>= 0)
4317 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4323 buf
= xmalloc (regset
->size
);
4325 /* First fill the buffer with the current register set contents,
4326 in case there are any items in the kernel's regset that are
4327 not in gdbserver's regcache. */
4329 nt_type
= regset
->nt_type
;
4333 iov
.iov_len
= regset
->size
;
4334 data
= (void *) &iov
;
4340 res
= ptrace (regset
->get_request
, pid
,
4341 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4343 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4348 /* Then overlay our cached registers on that. */
4349 regset
->fill_function (regcache
, buf
);
4351 /* Only now do we write the register set. */
4353 res
= ptrace (regset
->set_request
, pid
,
4354 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4356 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4364 /* If we get EIO on a regset, do not try it again for
4365 this process mode. */
4366 disable_regset (regsets_info
, regset
);
4370 else if (errno
== ESRCH
)
4372 /* At this point, ESRCH should mean the process is
4373 already gone, in which case we simply ignore attempts
4374 to change its registers. See also the related
4375 comment in linux_resume_one_lwp. */
4381 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4384 else if (regset
->type
== GENERAL_REGS
)
4385 saw_general_regs
= 1;
4389 if (saw_general_regs
)
4395 #else /* !HAVE_LINUX_REGSETS */
4397 #define use_linux_regsets 0
4398 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4399 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4403 /* Return 1 if register REGNO is supported by one of the regset ptrace
4404 calls or 0 if it has to be transferred individually. */
4407 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4409 unsigned char mask
= 1 << (regno
% 8);
4410 size_t index
= regno
/ 8;
4412 return (use_linux_regsets
4413 && (regs_info
->regset_bitmap
== NULL
4414 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4417 #ifdef HAVE_LINUX_USRREGS
4420 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4424 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4425 error ("Invalid register number %d.", regnum
);
4427 addr
= usrregs
->regmap
[regnum
];
4432 /* Fetch one register. */
4434 fetch_register (const struct usrregs_info
*usrregs
,
4435 struct regcache
*regcache
, int regno
)
4442 if (regno
>= usrregs
->num_regs
)
4444 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4447 regaddr
= register_addr (usrregs
, regno
);
4451 size
= ((register_size (regcache
->tdesc
, regno
)
4452 + sizeof (PTRACE_XFER_TYPE
) - 1)
4453 & -sizeof (PTRACE_XFER_TYPE
));
4454 buf
= alloca (size
);
4456 pid
= lwpid_of (current_inferior
);
4457 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4460 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4461 ptrace (PTRACE_PEEKUSER
, pid
,
4462 /* Coerce to a uintptr_t first to avoid potential gcc warning
4463 of coercing an 8 byte integer to a 4 byte pointer. */
4464 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4465 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4467 error ("reading register %d: %s", regno
, strerror (errno
));
4470 if (the_low_target
.supply_ptrace_register
)
4471 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4473 supply_register (regcache
, regno
, buf
);
4476 /* Store one register. */
4478 store_register (const struct usrregs_info
*usrregs
,
4479 struct regcache
*regcache
, int regno
)
4486 if (regno
>= usrregs
->num_regs
)
4488 if ((*the_low_target
.cannot_store_register
) (regno
))
4491 regaddr
= register_addr (usrregs
, regno
);
4495 size
= ((register_size (regcache
->tdesc
, regno
)
4496 + sizeof (PTRACE_XFER_TYPE
) - 1)
4497 & -sizeof (PTRACE_XFER_TYPE
));
4498 buf
= alloca (size
);
4499 memset (buf
, 0, size
);
4501 if (the_low_target
.collect_ptrace_register
)
4502 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4504 collect_register (regcache
, regno
, buf
);
4506 pid
= lwpid_of (current_inferior
);
4507 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4510 ptrace (PTRACE_POKEUSER
, pid
,
4511 /* Coerce to a uintptr_t first to avoid potential gcc warning
4512 about coercing an 8 byte integer to a 4 byte pointer. */
4513 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4514 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4517 /* At this point, ESRCH should mean the process is
4518 already gone, in which case we simply ignore attempts
4519 to change its registers. See also the related
4520 comment in linux_resume_one_lwp. */
4524 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4525 error ("writing register %d: %s", regno
, strerror (errno
));
4527 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4531 /* Fetch all registers, or just one, from the child process.
4532 If REGNO is -1, do this for all registers, skipping any that are
4533 assumed to have been retrieved by regsets_fetch_inferior_registers,
4534 unless ALL is non-zero.
4535 Otherwise, REGNO specifies which register (so we can save time). */
4537 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4538 struct regcache
*regcache
, int regno
, int all
)
4540 struct usrregs_info
*usr
= regs_info
->usrregs
;
4544 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4545 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4546 fetch_register (usr
, regcache
, regno
);
4549 fetch_register (usr
, regcache
, regno
);
4552 /* Store our register values back into the inferior.
4553 If REGNO is -1, do this for all registers, skipping any that are
4554 assumed to have been saved by regsets_store_inferior_registers,
4555 unless ALL is non-zero.
4556 Otherwise, REGNO specifies which register (so we can save time). */
4558 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4559 struct regcache
*regcache
, int regno
, int all
)
4561 struct usrregs_info
*usr
= regs_info
->usrregs
;
4565 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4566 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4567 store_register (usr
, regcache
, regno
);
4570 store_register (usr
, regcache
, regno
);
4573 #else /* !HAVE_LINUX_USRREGS */
4575 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4576 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4582 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4586 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4590 if (the_low_target
.fetch_register
!= NULL
4591 && regs_info
->usrregs
!= NULL
)
4592 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4593 (*the_low_target
.fetch_register
) (regcache
, regno
);
4595 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4596 if (regs_info
->usrregs
!= NULL
)
4597 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4601 if (the_low_target
.fetch_register
!= NULL
4602 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4605 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4607 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4609 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4610 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4615 linux_store_registers (struct regcache
*regcache
, int regno
)
4619 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4623 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4625 if (regs_info
->usrregs
!= NULL
)
4626 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4630 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4632 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4634 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4635 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4640 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4641 to debugger memory starting at MYADDR. */
4644 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4646 int pid
= lwpid_of (current_inferior
);
4647 register PTRACE_XFER_TYPE
*buffer
;
4648 register CORE_ADDR addr
;
4655 /* Try using /proc. Don't bother for one word. */
4656 if (len
>= 3 * sizeof (long))
4660 /* We could keep this file open and cache it - possibly one per
4661 thread. That requires some juggling, but is even faster. */
4662 sprintf (filename
, "/proc/%d/mem", pid
);
4663 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4667 /* If pread64 is available, use it. It's faster if the kernel
4668 supports it (only one syscall), and it's 64-bit safe even on
4669 32-bit platforms (for instance, SPARC debugging a SPARC64
4672 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4675 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4676 bytes
= read (fd
, myaddr
, len
);
4683 /* Some data was read, we'll try to get the rest with ptrace. */
4693 /* Round starting address down to longword boundary. */
4694 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4695 /* Round ending address up; get number of longwords that makes. */
4696 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4697 / sizeof (PTRACE_XFER_TYPE
));
4698 /* Allocate buffer of that many longwords. */
4699 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4701 /* Read all the longwords */
4703 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4705 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4706 about coercing an 8 byte integer to a 4 byte pointer. */
4707 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4708 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4709 (PTRACE_TYPE_ARG4
) 0);
4715 /* Copy appropriate bytes out of the buffer. */
4718 i
*= sizeof (PTRACE_XFER_TYPE
);
4719 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4721 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4728 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4729 memory at MEMADDR. On failure (cannot write to the inferior)
4730 returns the value of errno. Always succeeds if LEN is zero. */
4733 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4736 /* Round starting address down to longword boundary. */
4737 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4738 /* Round ending address up; get number of longwords that makes. */
4740 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4741 / sizeof (PTRACE_XFER_TYPE
);
4743 /* Allocate buffer of that many longwords. */
4744 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4745 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4747 int pid
= lwpid_of (current_inferior
);
4751 /* Zero length write always succeeds. */
4757 /* Dump up to four bytes. */
4758 unsigned int val
= * (unsigned int *) myaddr
;
4764 val
= val
& 0xffffff;
4765 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4766 val
, (long)memaddr
);
4769 /* Fill start and end extra bytes of buffer with existing memory data. */
4772 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4773 about coercing an 8 byte integer to a 4 byte pointer. */
4774 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4775 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4776 (PTRACE_TYPE_ARG4
) 0);
4784 = ptrace (PTRACE_PEEKTEXT
, pid
,
4785 /* Coerce to a uintptr_t first to avoid potential gcc warning
4786 about coercing an 8 byte integer to a 4 byte pointer. */
4787 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4788 * sizeof (PTRACE_XFER_TYPE
)),
4789 (PTRACE_TYPE_ARG4
) 0);
4794 /* Copy data to be written over corresponding part of buffer. */
4796 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4799 /* Write the entire buffer. */
4801 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4804 ptrace (PTRACE_POKETEXT
, pid
,
4805 /* Coerce to a uintptr_t first to avoid potential gcc warning
4806 about coercing an 8 byte integer to a 4 byte pointer. */
4807 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4808 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4817 linux_look_up_symbols (void)
4819 #ifdef USE_THREAD_DB
4820 struct process_info
*proc
= current_process ();
4822 if (proc
->private->thread_db
!= NULL
)
4825 /* If the kernel supports tracing clones, then we don't need to
4826 use the magic thread event breakpoint to learn about
4828 thread_db_init (!linux_supports_traceclone ());
4833 linux_request_interrupt (void)
4835 extern unsigned long signal_pid
;
4837 if (!ptid_equal (cont_thread
, null_ptid
)
4838 && !ptid_equal (cont_thread
, minus_one_ptid
))
4842 lwpid
= lwpid_of (current_inferior
);
4843 kill_lwp (lwpid
, SIGINT
);
4846 kill_lwp (signal_pid
, SIGINT
);
4849 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4850 to debugger memory starting at MYADDR. */
4853 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4855 char filename
[PATH_MAX
];
4857 int pid
= lwpid_of (current_inferior
);
4859 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4861 fd
= open (filename
, O_RDONLY
);
4865 if (offset
!= (CORE_ADDR
) 0
4866 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4869 n
= read (fd
, myaddr
, len
);
4876 /* These breakpoint and watchpoint related wrapper functions simply
4877 pass on the function call if the target has registered a
4878 corresponding function. */
4881 linux_supports_z_point_type (char z_type
)
4883 return (the_low_target
.supports_z_point_type
!= NULL
4884 && the_low_target
.supports_z_point_type (z_type
));
4888 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4889 int size
, struct raw_breakpoint
*bp
)
4891 if (the_low_target
.insert_point
!= NULL
)
4892 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4894 /* Unsupported (see target.h). */
4899 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4900 int size
, struct raw_breakpoint
*bp
)
4902 if (the_low_target
.remove_point
!= NULL
)
4903 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4905 /* Unsupported (see target.h). */
4910 linux_stopped_by_watchpoint (void)
4912 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4914 return lwp
->stopped_by_watchpoint
;
4918 linux_stopped_data_address (void)
4920 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4922 return lwp
->stopped_data_address
;
4925 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4926 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4927 && defined(PT_TEXT_END_ADDR)
4929 /* This is only used for targets that define PT_TEXT_ADDR,
4930 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4931 the target has different ways of acquiring this information, like
4934 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4935 to tell gdb about. */
4938 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4940 unsigned long text
, text_end
, data
;
4941 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4945 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4946 (PTRACE_TYPE_ARG4
) 0);
4947 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4948 (PTRACE_TYPE_ARG4
) 0);
4949 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4950 (PTRACE_TYPE_ARG4
) 0);
4954 /* Both text and data offsets produced at compile-time (and so
4955 used by gdb) are relative to the beginning of the program,
4956 with the data segment immediately following the text segment.
4957 However, the actual runtime layout in memory may put the data
4958 somewhere else, so when we send gdb a data base-address, we
4959 use the real data base address and subtract the compile-time
4960 data base-address from it (which is just the length of the
4961 text segment). BSS immediately follows data in both
4964 *data_p
= data
- (text_end
- text
);
4973 linux_qxfer_osdata (const char *annex
,
4974 unsigned char *readbuf
, unsigned const char *writebuf
,
4975 CORE_ADDR offset
, int len
)
4977 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4980 /* Convert a native/host siginfo object, into/from the siginfo in the
4981 layout of the inferiors' architecture. */
4984 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4988 if (the_low_target
.siginfo_fixup
!= NULL
)
4989 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4991 /* If there was no callback, or the callback didn't do anything,
4992 then just do a straight memcpy. */
4996 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4998 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5003 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5004 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5008 char inf_siginfo
[sizeof (siginfo_t
)];
5010 if (current_inferior
== NULL
)
5013 pid
= lwpid_of (current_inferior
);
5016 debug_printf ("%s siginfo for lwp %d.\n",
5017 readbuf
!= NULL
? "Reading" : "Writing",
5020 if (offset
>= sizeof (siginfo
))
5023 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5026 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5027 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5028 inferior with a 64-bit GDBSERVER should look the same as debugging it
5029 with a 32-bit GDBSERVER, we need to convert it. */
5030 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5032 if (offset
+ len
> sizeof (siginfo
))
5033 len
= sizeof (siginfo
) - offset
;
5035 if (readbuf
!= NULL
)
5036 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5039 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5041 /* Convert back to ptrace layout before flushing it out. */
5042 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5044 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5051 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5052 so we notice when children change state; as the handler for the
5053 sigsuspend in my_waitpid. */
5056 sigchld_handler (int signo
)
5058 int old_errno
= errno
;
5064 /* fprintf is not async-signal-safe, so call write
5066 if (write (2, "sigchld_handler\n",
5067 sizeof ("sigchld_handler\n") - 1) < 0)
5068 break; /* just ignore */
5072 if (target_is_async_p ())
5073 async_file_mark (); /* trigger a linux_wait */
5079 linux_supports_non_stop (void)
5085 linux_async (int enable
)
5087 int previous
= target_is_async_p ();
5090 debug_printf ("linux_async (%d), previous=%d\n",
5093 if (previous
!= enable
)
5096 sigemptyset (&mask
);
5097 sigaddset (&mask
, SIGCHLD
);
5099 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5103 if (pipe (linux_event_pipe
) == -1)
5104 fatal ("creating event pipe failed.");
5106 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5107 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5109 /* Register the event loop handler. */
5110 add_file_handler (linux_event_pipe
[0],
5111 handle_target_event
, NULL
);
5113 /* Always trigger a linux_wait. */
5118 delete_file_handler (linux_event_pipe
[0]);
5120 close (linux_event_pipe
[0]);
5121 close (linux_event_pipe
[1]);
5122 linux_event_pipe
[0] = -1;
5123 linux_event_pipe
[1] = -1;
5126 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5133 linux_start_non_stop (int nonstop
)
5135 /* Register or unregister from event-loop accordingly. */
5136 linux_async (nonstop
);
5141 linux_supports_multi_process (void)
5147 linux_supports_disable_randomization (void)
5149 #ifdef HAVE_PERSONALITY
5157 linux_supports_agent (void)
5163 linux_supports_range_stepping (void)
5165 if (*the_low_target
.supports_range_stepping
== NULL
)
5168 return (*the_low_target
.supports_range_stepping
) ();
5171 /* Enumerate spufs IDs for process PID. */
5173 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5179 struct dirent
*entry
;
5181 sprintf (path
, "/proc/%ld/fd", pid
);
5182 dir
= opendir (path
);
5187 while ((entry
= readdir (dir
)) != NULL
)
5193 fd
= atoi (entry
->d_name
);
5197 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5198 if (stat (path
, &st
) != 0)
5200 if (!S_ISDIR (st
.st_mode
))
5203 if (statfs (path
, &stfs
) != 0)
5205 if (stfs
.f_type
!= SPUFS_MAGIC
)
5208 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5210 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5220 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5221 object type, using the /proc file system. */
5223 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5224 unsigned const char *writebuf
,
5225 CORE_ADDR offset
, int len
)
5227 long pid
= lwpid_of (current_inferior
);
5232 if (!writebuf
&& !readbuf
)
5240 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5243 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5244 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5249 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5256 ret
= write (fd
, writebuf
, (size_t) len
);
5258 ret
= read (fd
, readbuf
, (size_t) len
);
5264 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5265 struct target_loadseg
5267 /* Core address to which the segment is mapped. */
5269 /* VMA recorded in the program header. */
5271 /* Size of this segment in memory. */
5275 # if defined PT_GETDSBT
5276 struct target_loadmap
5278 /* Protocol version number, must be zero. */
5280 /* Pointer to the DSBT table, its size, and the DSBT index. */
5281 unsigned *dsbt_table
;
5282 unsigned dsbt_size
, dsbt_index
;
5283 /* Number of segments in this map. */
5285 /* The actual memory map. */
5286 struct target_loadseg segs
[/*nsegs*/];
5288 # define LINUX_LOADMAP PT_GETDSBT
5289 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5290 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5292 struct target_loadmap
5294 /* Protocol version number, must be zero. */
5296 /* Number of segments in this map. */
5298 /* The actual memory map. */
5299 struct target_loadseg segs
[/*nsegs*/];
5301 # define LINUX_LOADMAP PTRACE_GETFDPIC
5302 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5303 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5307 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5308 unsigned char *myaddr
, unsigned int len
)
5310 int pid
= lwpid_of (current_inferior
);
5312 struct target_loadmap
*data
= NULL
;
5313 unsigned int actual_length
, copy_length
;
5315 if (strcmp (annex
, "exec") == 0)
5316 addr
= (int) LINUX_LOADMAP_EXEC
;
5317 else if (strcmp (annex
, "interp") == 0)
5318 addr
= (int) LINUX_LOADMAP_INTERP
;
5322 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5328 actual_length
= sizeof (struct target_loadmap
)
5329 + sizeof (struct target_loadseg
) * data
->nsegs
;
5331 if (offset
< 0 || offset
> actual_length
)
5334 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5335 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5339 # define linux_read_loadmap NULL
5340 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5343 linux_process_qsupported (const char *query
)
5345 if (the_low_target
.process_qsupported
!= NULL
)
5346 the_low_target
.process_qsupported (query
);
5350 linux_supports_tracepoints (void)
5352 if (*the_low_target
.supports_tracepoints
== NULL
)
5355 return (*the_low_target
.supports_tracepoints
) ();
5359 linux_read_pc (struct regcache
*regcache
)
5361 if (the_low_target
.get_pc
== NULL
)
5364 return (*the_low_target
.get_pc
) (regcache
);
5368 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5370 gdb_assert (the_low_target
.set_pc
!= NULL
);
5372 (*the_low_target
.set_pc
) (regcache
, pc
);
5376 linux_thread_stopped (struct thread_info
*thread
)
5378 return get_thread_lwp (thread
)->stopped
;
5381 /* This exposes stop-all-threads functionality to other modules. */
5384 linux_pause_all (int freeze
)
5386 stop_all_lwps (freeze
, NULL
);
5389 /* This exposes unstop-all-threads functionality to other gdbserver
5393 linux_unpause_all (int unfreeze
)
5395 unstop_all_lwps (unfreeze
, NULL
);
5399 linux_prepare_to_access_memory (void)
5401 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5404 linux_pause_all (1);
5409 linux_done_accessing_memory (void)
5411 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5414 linux_unpause_all (1);
5418 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5419 CORE_ADDR collector
,
5422 CORE_ADDR
*jump_entry
,
5423 CORE_ADDR
*trampoline
,
5424 ULONGEST
*trampoline_size
,
5425 unsigned char *jjump_pad_insn
,
5426 ULONGEST
*jjump_pad_insn_size
,
5427 CORE_ADDR
*adjusted_insn_addr
,
5428 CORE_ADDR
*adjusted_insn_addr_end
,
5431 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5432 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5433 jump_entry
, trampoline
, trampoline_size
,
5434 jjump_pad_insn
, jjump_pad_insn_size
,
5435 adjusted_insn_addr
, adjusted_insn_addr_end
,
5439 static struct emit_ops
*
5440 linux_emit_ops (void)
5442 if (the_low_target
.emit_ops
!= NULL
)
5443 return (*the_low_target
.emit_ops
) ();
5449 linux_get_min_fast_tracepoint_insn_len (void)
5451 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5454 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5457 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5458 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5460 char filename
[PATH_MAX
];
5462 const int auxv_size
= is_elf64
5463 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5464 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5466 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5468 fd
= open (filename
, O_RDONLY
);
5474 while (read (fd
, buf
, auxv_size
) == auxv_size
5475 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5479 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5481 switch (aux
->a_type
)
5484 *phdr_memaddr
= aux
->a_un
.a_val
;
5487 *num_phdr
= aux
->a_un
.a_val
;
5493 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5495 switch (aux
->a_type
)
5498 *phdr_memaddr
= aux
->a_un
.a_val
;
5501 *num_phdr
= aux
->a_un
.a_val
;
5509 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5511 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5512 "phdr_memaddr = %ld, phdr_num = %d",
5513 (long) *phdr_memaddr
, *num_phdr
);
5520 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5523 get_dynamic (const int pid
, const int is_elf64
)
5525 CORE_ADDR phdr_memaddr
, relocation
;
5527 unsigned char *phdr_buf
;
5528 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5530 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5533 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5534 phdr_buf
= alloca (num_phdr
* phdr_size
);
5536 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5539 /* Compute relocation: it is expected to be 0 for "regular" executables,
5540 non-zero for PIE ones. */
5542 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5545 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5547 if (p
->p_type
== PT_PHDR
)
5548 relocation
= phdr_memaddr
- p
->p_vaddr
;
5552 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5554 if (p
->p_type
== PT_PHDR
)
5555 relocation
= phdr_memaddr
- p
->p_vaddr
;
5558 if (relocation
== -1)
5560 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5561 any real world executables, including PIE executables, have always
5562 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5563 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5564 or present DT_DEBUG anyway (fpc binaries are statically linked).
5566 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5568 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5573 for (i
= 0; i
< num_phdr
; i
++)
5577 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5579 if (p
->p_type
== PT_DYNAMIC
)
5580 return p
->p_vaddr
+ relocation
;
5584 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5586 if (p
->p_type
== PT_DYNAMIC
)
5587 return p
->p_vaddr
+ relocation
;
5594 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5595 can be 0 if the inferior does not yet have the library list initialized.
5596 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5597 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5600 get_r_debug (const int pid
, const int is_elf64
)
5602 CORE_ADDR dynamic_memaddr
;
5603 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5604 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5607 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5608 if (dynamic_memaddr
== 0)
5611 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5615 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5616 #ifdef DT_MIPS_RLD_MAP
5620 unsigned char buf
[sizeof (Elf64_Xword
)];
5624 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5626 if (linux_read_memory (dyn
->d_un
.d_val
,
5627 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5632 #endif /* DT_MIPS_RLD_MAP */
5634 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5635 map
= dyn
->d_un
.d_val
;
5637 if (dyn
->d_tag
== DT_NULL
)
5642 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5643 #ifdef DT_MIPS_RLD_MAP
5647 unsigned char buf
[sizeof (Elf32_Word
)];
5651 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5653 if (linux_read_memory (dyn
->d_un
.d_val
,
5654 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5659 #endif /* DT_MIPS_RLD_MAP */
5661 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5662 map
= dyn
->d_un
.d_val
;
5664 if (dyn
->d_tag
== DT_NULL
)
5668 dynamic_memaddr
+= dyn_size
;
5674 /* Read one pointer from MEMADDR in the inferior. */
5677 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5681 /* Go through a union so this works on either big or little endian
5682 hosts, when the inferior's pointer size is smaller than the size
5683 of CORE_ADDR. It is assumed the inferior's endianness is the
5684 same of the superior's. */
5687 CORE_ADDR core_addr
;
5692 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5695 if (ptr_size
== sizeof (CORE_ADDR
))
5696 *ptr
= addr
.core_addr
;
5697 else if (ptr_size
== sizeof (unsigned int))
5700 gdb_assert_not_reached ("unhandled pointer size");
5705 struct link_map_offsets
5707 /* Offset and size of r_debug.r_version. */
5708 int r_version_offset
;
5710 /* Offset and size of r_debug.r_map. */
5713 /* Offset to l_addr field in struct link_map. */
5716 /* Offset to l_name field in struct link_map. */
5719 /* Offset to l_ld field in struct link_map. */
5722 /* Offset to l_next field in struct link_map. */
5725 /* Offset to l_prev field in struct link_map. */
5729 /* Construct qXfer:libraries-svr4:read reply. */
5732 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5733 unsigned const char *writebuf
,
5734 CORE_ADDR offset
, int len
)
5737 unsigned document_len
;
5738 struct process_info_private
*const priv
= current_process ()->private;
5739 char filename
[PATH_MAX
];
5742 static const struct link_map_offsets lmo_32bit_offsets
=
5744 0, /* r_version offset. */
5745 4, /* r_debug.r_map offset. */
5746 0, /* l_addr offset in link_map. */
5747 4, /* l_name offset in link_map. */
5748 8, /* l_ld offset in link_map. */
5749 12, /* l_next offset in link_map. */
5750 16 /* l_prev offset in link_map. */
5753 static const struct link_map_offsets lmo_64bit_offsets
=
5755 0, /* r_version offset. */
5756 8, /* r_debug.r_map offset. */
5757 0, /* l_addr offset in link_map. */
5758 8, /* l_name offset in link_map. */
5759 16, /* l_ld offset in link_map. */
5760 24, /* l_next offset in link_map. */
5761 32 /* l_prev offset in link_map. */
5763 const struct link_map_offsets
*lmo
;
5764 unsigned int machine
;
5766 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5767 int allocated
= 1024;
5769 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5770 int header_done
= 0;
5772 if (writebuf
!= NULL
)
5774 if (readbuf
== NULL
)
5777 pid
= lwpid_of (current_inferior
);
5778 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5779 is_elf64
= elf_64_file_p (filename
, &machine
);
5780 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5781 ptr_size
= is_elf64
? 8 : 4;
5783 while (annex
[0] != '\0')
5789 sep
= strchr (annex
, '=');
5794 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5796 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5800 annex
= strchr (sep
, ';');
5807 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5814 if (priv
->r_debug
== 0)
5815 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5817 /* We failed to find DT_DEBUG. Such situation will not change
5818 for this inferior - do not retry it. Report it to GDB as
5819 E01, see for the reasons at the GDB solib-svr4.c side. */
5820 if (priv
->r_debug
== (CORE_ADDR
) -1)
5823 if (priv
->r_debug
!= 0)
5825 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5826 (unsigned char *) &r_version
,
5827 sizeof (r_version
)) != 0
5830 warning ("unexpected r_debug version %d", r_version
);
5832 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5833 &lm_addr
, ptr_size
) != 0)
5835 warning ("unable to read r_map from 0x%lx",
5836 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5841 document
= xmalloc (allocated
);
5842 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5843 p
= document
+ strlen (document
);
5846 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5847 &l_name
, ptr_size
) == 0
5848 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5849 &l_addr
, ptr_size
) == 0
5850 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5851 &l_ld
, ptr_size
) == 0
5852 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5853 &l_prev
, ptr_size
) == 0
5854 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5855 &l_next
, ptr_size
) == 0)
5857 unsigned char libname
[PATH_MAX
];
5859 if (lm_prev
!= l_prev
)
5861 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5862 (long) lm_prev
, (long) l_prev
);
5866 /* Ignore the first entry even if it has valid name as the first entry
5867 corresponds to the main executable. The first entry should not be
5868 skipped if the dynamic loader was loaded late by a static executable
5869 (see solib-svr4.c parameter ignore_first). But in such case the main
5870 executable does not have PT_DYNAMIC present and this function already
5871 exited above due to failed get_r_debug. */
5874 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5879 /* Not checking for error because reading may stop before
5880 we've got PATH_MAX worth of characters. */
5882 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5883 libname
[sizeof (libname
) - 1] = '\0';
5884 if (libname
[0] != '\0')
5886 /* 6x the size for xml_escape_text below. */
5887 size_t len
= 6 * strlen ((char *) libname
);
5892 /* Terminate `<library-list-svr4'. */
5897 while (allocated
< p
- document
+ len
+ 200)
5899 /* Expand to guarantee sufficient storage. */
5900 uintptr_t document_len
= p
- document
;
5902 document
= xrealloc (document
, 2 * allocated
);
5904 p
= document
+ document_len
;
5907 name
= xml_escape_text ((char *) libname
);
5908 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5909 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5910 name
, (unsigned long) lm_addr
,
5911 (unsigned long) l_addr
, (unsigned long) l_ld
);
5922 /* Empty list; terminate `<library-list-svr4'. */
5926 strcpy (p
, "</library-list-svr4>");
5928 document_len
= strlen (document
);
5929 if (offset
< document_len
)
5930 document_len
-= offset
;
5933 if (len
> document_len
)
5936 memcpy (readbuf
, document
+ offset
, len
);
5942 #ifdef HAVE_LINUX_BTRACE
5944 /* See to_enable_btrace target method. */
5946 static struct btrace_target_info
*
5947 linux_low_enable_btrace (ptid_t ptid
)
5949 struct btrace_target_info
*tinfo
;
5951 tinfo
= linux_enable_btrace (ptid
);
5955 struct thread_info
*thread
= find_thread_ptid (ptid
);
5956 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5958 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5964 /* See to_disable_btrace target method. */
5967 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5969 enum btrace_error err
;
5971 err
= linux_disable_btrace (tinfo
);
5972 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5975 /* See to_read_btrace target method. */
5978 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5981 VEC (btrace_block_s
) *btrace
;
5982 struct btrace_block
*block
;
5983 enum btrace_error err
;
5987 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5988 if (err
!= BTRACE_ERR_NONE
)
5990 if (err
== BTRACE_ERR_OVERFLOW
)
5991 buffer_grow_str0 (buffer
, "E.Overflow.");
5993 buffer_grow_str0 (buffer
, "E.Generic Error.");
5998 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5999 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6001 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
6002 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6003 paddress (block
->begin
), paddress (block
->end
));
6005 buffer_grow_str0 (buffer
, "</btrace>\n");
6007 VEC_free (btrace_block_s
, btrace
);
6011 #endif /* HAVE_LINUX_BTRACE */
6013 static struct target_ops linux_target_ops
= {
6014 linux_create_inferior
,
6023 linux_fetch_registers
,
6024 linux_store_registers
,
6025 linux_prepare_to_access_memory
,
6026 linux_done_accessing_memory
,
6029 linux_look_up_symbols
,
6030 linux_request_interrupt
,
6032 linux_supports_z_point_type
,
6035 linux_stopped_by_watchpoint
,
6036 linux_stopped_data_address
,
6037 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6038 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6039 && defined(PT_TEXT_END_ADDR)
6044 #ifdef USE_THREAD_DB
6045 thread_db_get_tls_address
,
6050 hostio_last_error_from_errno
,
6053 linux_supports_non_stop
,
6055 linux_start_non_stop
,
6056 linux_supports_multi_process
,
6057 #ifdef USE_THREAD_DB
6058 thread_db_handle_monitor_command
,
6062 linux_common_core_of_thread
,
6064 linux_process_qsupported
,
6065 linux_supports_tracepoints
,
6068 linux_thread_stopped
,
6072 linux_cancel_breakpoints
,
6073 linux_stabilize_threads
,
6074 linux_install_fast_tracepoint_jump_pad
,
6076 linux_supports_disable_randomization
,
6077 linux_get_min_fast_tracepoint_insn_len
,
6078 linux_qxfer_libraries_svr4
,
6079 linux_supports_agent
,
6080 #ifdef HAVE_LINUX_BTRACE
6081 linux_supports_btrace
,
6082 linux_low_enable_btrace
,
6083 linux_low_disable_btrace
,
6084 linux_low_read_btrace
,
6091 linux_supports_range_stepping
,
6095 linux_init_signals ()
6097 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6098 to find what the cancel signal actually is. */
6099 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6100 signal (__SIGRTMIN
+1, SIG_IGN
);
6104 #ifdef HAVE_LINUX_REGSETS
6106 initialize_regsets_info (struct regsets_info
*info
)
6108 for (info
->num_regsets
= 0;
6109 info
->regsets
[info
->num_regsets
].size
>= 0;
6110 info
->num_regsets
++)
6116 initialize_low (void)
6118 struct sigaction sigchld_action
;
6119 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6120 set_target_ops (&linux_target_ops
);
6121 set_breakpoint_data (the_low_target
.breakpoint
,
6122 the_low_target
.breakpoint_len
);
6123 linux_init_signals ();
6124 linux_ptrace_init_warnings ();
6126 sigchld_action
.sa_handler
= sigchld_handler
;
6127 sigemptyset (&sigchld_action
.sa_mask
);
6128 sigchld_action
.sa_flags
= SA_RESTART
;
6129 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6131 initialize_low_arch ();