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"
28 #include <sys/ptrace.h>
29 #include "nat/linux-ptrace.h"
30 #include "nat/linux-procfs.h"
32 #include <sys/ioctl.h>
38 #include <sys/syscall.h>
42 #include <sys/types.h>
47 #include "filestuff.h"
48 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
59 #define SPUFS_MAGIC 0x23c9b64e
62 #ifdef HAVE_PERSONALITY
63 # include <sys/personality.h>
64 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
65 # define ADDR_NO_RANDOMIZE 0x0040000
74 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
77 /* This is the kernel's hard limit. Not to be confused with
83 /* Some targets did not define these ptrace constants from the start,
84 so gdbserver defines them locally here. In the future, these may
85 be removed after they are added to asm/ptrace.h. */
86 #if !(defined(PT_TEXT_ADDR) \
87 || defined(PT_DATA_ADDR) \
88 || defined(PT_TEXT_END_ADDR))
89 #if defined(__mcoldfire__)
90 /* These are still undefined in 3.10 kernels. */
91 #define PT_TEXT_ADDR 49*4
92 #define PT_DATA_ADDR 50*4
93 #define PT_TEXT_END_ADDR 51*4
94 /* BFIN already defines these since at least 2.6.32 kernels. */
96 #define PT_TEXT_ADDR 220
97 #define PT_TEXT_END_ADDR 224
98 #define PT_DATA_ADDR 228
99 /* These are still undefined in 3.10 kernels. */
100 #elif defined(__TMS320C6X__)
101 #define PT_TEXT_ADDR (0x10000*4)
102 #define PT_DATA_ADDR (0x10004*4)
103 #define PT_TEXT_END_ADDR (0x10008*4)
107 #ifdef HAVE_LINUX_BTRACE
108 # include "nat/linux-btrace.h"
111 #ifndef HAVE_ELF32_AUXV_T
112 /* Copied from glibc's elf.h. */
115 uint32_t a_type
; /* Entry type */
118 uint32_t a_val
; /* Integer value */
119 /* We use to have pointer elements added here. We cannot do that,
120 though, since it does not work when using 32-bit definitions
121 on 64-bit platforms and vice versa. */
126 #ifndef HAVE_ELF64_AUXV_T
127 /* Copied from glibc's elf.h. */
130 uint64_t a_type
; /* Entry type */
133 uint64_t a_val
; /* Integer value */
134 /* We use to have pointer elements added here. We cannot do that,
135 though, since it does not work when using 32-bit definitions
136 on 64-bit platforms and vice versa. */
141 /* A list of all unknown processes which receive stop signals. Some
142 other process will presumably claim each of these as forked
143 children momentarily. */
145 struct simple_pid_list
147 /* The process ID. */
150 /* The status as reported by waitpid. */
154 struct simple_pid_list
*next
;
156 struct simple_pid_list
*stopped_pids
;
158 /* Trivial list manipulation functions to keep track of a list of new
159 stopped processes. */
162 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
164 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
167 new_pid
->status
= status
;
168 new_pid
->next
= *listp
;
173 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
175 struct simple_pid_list
**p
;
177 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
178 if ((*p
)->pid
== pid
)
180 struct simple_pid_list
*next
= (*p
)->next
;
182 *statusp
= (*p
)->status
;
190 enum stopping_threads_kind
192 /* Not stopping threads presently. */
193 NOT_STOPPING_THREADS
,
195 /* Stopping threads. */
198 /* Stopping and suspending threads. */
199 STOPPING_AND_SUSPENDING_THREADS
202 /* This is set while stop_all_lwps is in effect. */
203 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
205 /* FIXME make into a target method? */
206 int using_threads
= 1;
208 /* True if we're presently stabilizing threads (moving them out of
210 static int stabilizing_threads
;
212 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
213 int step
, int signal
, siginfo_t
*info
);
214 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
215 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
216 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
217 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
218 int *wstat
, int options
);
219 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
220 static struct lwp_info
*add_lwp (ptid_t ptid
);
221 static int linux_stopped_by_watchpoint (void);
222 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
223 static void proceed_all_lwps (void);
224 static int finish_step_over (struct lwp_info
*lwp
);
225 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
226 static int kill_lwp (unsigned long lwpid
, int signo
);
228 /* True if the low target can hardware single-step. Such targets
229 don't need a BREAKPOINT_REINSERT_ADDR callback. */
232 can_hardware_single_step (void)
234 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
237 /* True if the low target supports memory breakpoints. If so, we'll
238 have a GET_PC implementation. */
241 supports_breakpoints (void)
243 return (the_low_target
.get_pc
!= NULL
);
246 /* Returns true if this target can support fast tracepoints. This
247 does not mean that the in-process agent has been loaded in the
251 supports_fast_tracepoints (void)
253 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
256 /* True if LWP is stopped in its stepping range. */
259 lwp_in_step_range (struct lwp_info
*lwp
)
261 CORE_ADDR pc
= lwp
->stop_pc
;
263 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
266 struct pending_signals
270 struct pending_signals
*prev
;
273 /* The read/write ends of the pipe registered as waitable file in the
275 static int linux_event_pipe
[2] = { -1, -1 };
277 /* True if we're currently in async mode. */
278 #define target_is_async_p() (linux_event_pipe[0] != -1)
280 static void send_sigstop (struct lwp_info
*lwp
);
281 static void wait_for_sigstop (void);
283 /* Return non-zero if HEADER is a 64-bit ELF file. */
286 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
288 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
289 && header
->e_ident
[EI_MAG1
] == ELFMAG1
290 && header
->e_ident
[EI_MAG2
] == ELFMAG2
291 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
293 *machine
= header
->e_machine
;
294 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
301 /* Return non-zero if FILE is a 64-bit ELF file,
302 zero if the file is not a 64-bit ELF file,
303 and -1 if the file is not accessible or doesn't exist. */
306 elf_64_file_p (const char *file
, unsigned int *machine
)
311 fd
= open (file
, O_RDONLY
);
315 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
322 return elf_64_header_p (&header
, machine
);
325 /* Accepts an integer PID; Returns true if the executable PID is
326 running is a 64-bit ELF file.. */
329 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
333 sprintf (file
, "/proc/%d/exe", pid
);
334 return elf_64_file_p (file
, machine
);
338 delete_lwp (struct lwp_info
*lwp
)
340 struct thread_info
*thr
= get_lwp_thread (lwp
);
343 debug_printf ("deleting %ld\n", lwpid_of (thr
));
346 free (lwp
->arch_private
);
350 /* Add a process to the common process list, and set its private
353 static struct process_info
*
354 linux_add_process (int pid
, int attached
)
356 struct process_info
*proc
;
358 proc
= add_process (pid
, attached
);
359 proc
->private = xcalloc (1, sizeof (*proc
->private));
361 /* Set the arch when the first LWP stops. */
362 proc
->private->new_inferior
= 1;
364 if (the_low_target
.new_process
!= NULL
)
365 proc
->private->arch_private
= the_low_target
.new_process ();
370 /* Handle a GNU/Linux extended wait response. If we see a clone
371 event, we need to add the new LWP to our list (and not report the
372 trap to higher layers). */
375 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
377 int event
= wstat
>> 16;
378 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
379 struct lwp_info
*new_lwp
;
381 if (event
== PTRACE_EVENT_CLONE
)
384 unsigned long new_pid
;
387 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
390 /* If we haven't already seen the new PID stop, wait for it now. */
391 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
393 /* The new child has a pending SIGSTOP. We can't affect it until it
394 hits the SIGSTOP, but we're already attached. */
396 ret
= my_waitpid (new_pid
, &status
, __WALL
);
399 perror_with_name ("waiting for new child");
400 else if (ret
!= new_pid
)
401 warning ("wait returned unexpected PID %d", ret
);
402 else if (!WIFSTOPPED (status
))
403 warning ("wait returned unexpected status 0x%x", status
);
407 debug_printf ("HEW: Got clone event "
408 "from LWP %ld, new child is LWP %ld\n",
409 lwpid_of (event_thr
), new_pid
);
411 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
412 new_lwp
= add_lwp (ptid
);
414 /* Either we're going to immediately resume the new thread
415 or leave it stopped. linux_resume_one_lwp is a nop if it
416 thinks the thread is currently running, so set this first
417 before calling linux_resume_one_lwp. */
418 new_lwp
->stopped
= 1;
420 /* If we're suspending all threads, leave this one suspended
422 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
423 new_lwp
->suspended
= 1;
425 /* Normally we will get the pending SIGSTOP. But in some cases
426 we might get another signal delivered to the group first.
427 If we do get another signal, be sure not to lose it. */
428 if (WSTOPSIG (status
) == SIGSTOP
)
430 if (stopping_threads
!= NOT_STOPPING_THREADS
)
431 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
433 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
437 new_lwp
->stop_expected
= 1;
439 if (stopping_threads
!= NOT_STOPPING_THREADS
)
441 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
442 new_lwp
->status_pending_p
= 1;
443 new_lwp
->status_pending
= status
;
446 /* Pass the signal on. This is what GDB does - except
447 shouldn't we really report it instead? */
448 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
451 /* Always resume the current thread. If we are stopping
452 threads, it will have a pending SIGSTOP; we may as well
454 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
458 /* Return the PC as read from the regcache of LWP, without any
462 get_pc (struct lwp_info
*lwp
)
464 struct thread_info
*saved_inferior
;
465 struct regcache
*regcache
;
468 if (the_low_target
.get_pc
== NULL
)
471 saved_inferior
= current_inferior
;
472 current_inferior
= get_lwp_thread (lwp
);
474 regcache
= get_thread_regcache (current_inferior
, 1);
475 pc
= (*the_low_target
.get_pc
) (regcache
);
478 debug_printf ("pc is 0x%lx\n", (long) pc
);
480 current_inferior
= saved_inferior
;
484 /* This function should only be called if LWP got a SIGTRAP.
485 The SIGTRAP could mean several things.
487 On i386, where decr_pc_after_break is non-zero:
488 If we were single-stepping this process using PTRACE_SINGLESTEP,
489 we will get only the one SIGTRAP (even if the instruction we
490 stepped over was a breakpoint). The value of $eip will be the
492 If we continue the process using PTRACE_CONT, we will get a
493 SIGTRAP when we hit a breakpoint. The value of $eip will be
494 the instruction after the breakpoint (i.e. needs to be
495 decremented). If we report the SIGTRAP to GDB, we must also
496 report the undecremented PC. If we cancel the SIGTRAP, we
497 must resume at the decremented PC.
499 (Presumably, not yet tested) On a non-decr_pc_after_break machine
500 with hardware or kernel single-step:
501 If we single-step over a breakpoint instruction, our PC will
502 point at the following instruction. If we continue and hit a
503 breakpoint instruction, our PC will point at the breakpoint
507 get_stop_pc (struct lwp_info
*lwp
)
511 if (the_low_target
.get_pc
== NULL
)
514 stop_pc
= get_pc (lwp
);
516 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
518 && !lwp
->stopped_by_watchpoint
519 && lwp
->last_status
>> 16 == 0)
520 stop_pc
-= the_low_target
.decr_pc_after_break
;
523 debug_printf ("stop pc is 0x%lx\n", (long) stop_pc
);
528 static struct lwp_info
*
529 add_lwp (ptid_t ptid
)
531 struct lwp_info
*lwp
;
533 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
534 memset (lwp
, 0, sizeof (*lwp
));
536 if (the_low_target
.new_thread
!= NULL
)
537 lwp
->arch_private
= the_low_target
.new_thread ();
539 lwp
->thread
= add_thread (ptid
, lwp
);
544 /* Start an inferior process and returns its pid.
545 ALLARGS is a vector of program-name and args. */
548 linux_create_inferior (char *program
, char **allargs
)
550 #ifdef HAVE_PERSONALITY
551 int personality_orig
= 0, personality_set
= 0;
553 struct lwp_info
*new_lwp
;
557 #ifdef HAVE_PERSONALITY
558 if (disable_randomization
)
561 personality_orig
= personality (0xffffffff);
562 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
565 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
567 if (errno
!= 0 || (personality_set
568 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
569 warning ("Error disabling address space randomization: %s",
574 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
580 perror_with_name ("fork");
585 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
587 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
588 signal (__SIGRTMIN
+ 1, SIG_DFL
);
593 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
594 stdout to stderr so that inferior i/o doesn't corrupt the connection.
595 Also, redirect stdin to /dev/null. */
596 if (remote_connection_is_stdio ())
599 open ("/dev/null", O_RDONLY
);
601 if (write (2, "stdin/stdout redirected\n",
602 sizeof ("stdin/stdout redirected\n") - 1) < 0)
604 /* Errors ignored. */;
608 execv (program
, allargs
);
610 execvp (program
, allargs
);
612 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
618 #ifdef HAVE_PERSONALITY
622 personality (personality_orig
);
624 warning ("Error restoring address space randomization: %s",
629 linux_add_process (pid
, 0);
631 ptid
= ptid_build (pid
, pid
, 0);
632 new_lwp
= add_lwp (ptid
);
633 new_lwp
->must_set_ptrace_flags
= 1;
639 linux_attach_fail_reason_string (ptid_t ptid
, int err
)
641 static char *reason_string
;
642 struct buffer buffer
;
644 long lwpid
= ptid_get_lwp (ptid
);
646 xfree (reason_string
);
648 buffer_init (&buffer
);
649 linux_ptrace_attach_fail_reason (lwpid
, &buffer
);
650 buffer_grow_str0 (&buffer
, "");
651 warnings
= buffer_finish (&buffer
);
652 if (warnings
[0] != '\0')
653 reason_string
= xstrprintf ("%s (%d), %s",
654 strerror (err
), err
, warnings
);
656 reason_string
= xstrprintf ("%s (%d)",
657 strerror (err
), err
);
659 return reason_string
;
662 /* Attach to an inferior process. */
665 linux_attach_lwp (ptid_t ptid
)
667 struct lwp_info
*new_lwp
;
668 int lwpid
= ptid_get_lwp (ptid
);
670 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
674 new_lwp
= add_lwp (ptid
);
676 /* We need to wait for SIGSTOP before being able to make the next
677 ptrace call on this LWP. */
678 new_lwp
->must_set_ptrace_flags
= 1;
680 if (linux_proc_pid_is_stopped (lwpid
))
683 debug_printf ("Attached to a stopped process\n");
685 /* The process is definitely stopped. It is in a job control
686 stop, unless the kernel predates the TASK_STOPPED /
687 TASK_TRACED distinction, in which case it might be in a
688 ptrace stop. Make sure it is in a ptrace stop; from there we
689 can kill it, signal it, et cetera.
691 First make sure there is a pending SIGSTOP. Since we are
692 already attached, the process can not transition from stopped
693 to running without a PTRACE_CONT; so we know this signal will
694 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
695 probably already in the queue (unless this kernel is old
696 enough to use TASK_STOPPED for ptrace stops); but since
697 SIGSTOP is not an RT signal, it can only be queued once. */
698 kill_lwp (lwpid
, SIGSTOP
);
700 /* Finally, resume the stopped process. This will deliver the
701 SIGSTOP (or a higher priority signal, just like normal
702 PTRACE_ATTACH), which we'll catch later on. */
703 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
706 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
709 There are several cases to consider here:
711 1) gdbserver has already attached to the process and is being notified
712 of a new thread that is being created.
713 In this case we should ignore that SIGSTOP and resume the
714 process. This is handled below by setting stop_expected = 1,
715 and the fact that add_thread sets last_resume_kind ==
718 2) This is the first thread (the process thread), and we're attaching
719 to it via attach_inferior.
720 In this case we want the process thread to stop.
721 This is handled by having linux_attach set last_resume_kind ==
722 resume_stop after we return.
724 If the pid we are attaching to is also the tgid, we attach to and
725 stop all the existing threads. Otherwise, we attach to pid and
726 ignore any other threads in the same group as this pid.
728 3) GDB is connecting to gdbserver and is requesting an enumeration of all
730 In this case we want the thread to stop.
731 FIXME: This case is currently not properly handled.
732 We should wait for the SIGSTOP but don't. Things work apparently
733 because enough time passes between when we ptrace (ATTACH) and when
734 gdb makes the next ptrace call on the thread.
736 On the other hand, if we are currently trying to stop all threads, we
737 should treat the new thread as if we had sent it a SIGSTOP. This works
738 because we are guaranteed that the add_lwp call above added us to the
739 end of the list, and so the new thread has not yet reached
740 wait_for_sigstop (but will). */
741 new_lwp
->stop_expected
= 1;
746 /* Attach to PID. If PID is the tgid, attach to it and all
750 linux_attach (unsigned long pid
)
752 ptid_t ptid
= ptid_build (pid
, pid
, 0);
755 /* Attach to PID. We will check for other threads
757 err
= linux_attach_lwp (ptid
);
759 error ("Cannot attach to process %ld: %s",
760 pid
, linux_attach_fail_reason_string (ptid
, err
));
762 linux_add_process (pid
, 1);
766 struct thread_info
*thread
;
768 /* Don't ignore the initial SIGSTOP if we just attached to this
769 process. It will be collected by wait shortly. */
770 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
771 thread
->last_resume_kind
= resume_stop
;
774 if (linux_proc_get_tgid (pid
) == pid
)
779 sprintf (pathname
, "/proc/%ld/task", pid
);
781 dir
= opendir (pathname
);
785 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
790 /* At this point we attached to the tgid. Scan the task for
792 int new_threads_found
;
795 while (iterations
< 2)
799 new_threads_found
= 0;
800 /* Add all the other threads. While we go through the
801 threads, new threads may be spawned. Cycle through
802 the list of threads until we have done two iterations without
803 finding new threads. */
804 while ((dp
= readdir (dir
)) != NULL
)
810 lwp
= strtoul (dp
->d_name
, NULL
, 10);
812 ptid
= ptid_build (pid
, lwp
, 0);
814 /* Is this a new thread? */
815 if (lwp
!= 0 && find_thread_ptid (ptid
) == NULL
)
820 debug_printf ("Found new lwp %ld\n", lwp
);
822 err
= linux_attach_lwp (ptid
);
824 warning ("Cannot attach to lwp %ld: %s",
826 linux_attach_fail_reason_string (ptid
, err
));
832 if (!new_threads_found
)
853 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
855 struct counter
*counter
= args
;
857 if (ptid_get_pid (entry
->id
) == counter
->pid
)
859 if (++counter
->count
> 1)
867 last_thread_of_process_p (int pid
)
869 struct counter counter
= { pid
, 0 };
871 return (find_inferior (&all_threads
,
872 second_thread_of_pid_p
, &counter
) == NULL
);
878 linux_kill_one_lwp (struct lwp_info
*lwp
)
880 struct thread_info
*thr
= get_lwp_thread (lwp
);
881 int pid
= lwpid_of (thr
);
883 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
884 there is no signal context, and ptrace(PTRACE_KILL) (or
885 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
886 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
887 alternative is to kill with SIGKILL. We only need one SIGKILL
888 per process, not one for each thread. But since we still support
889 linuxthreads, and we also support debugging programs using raw
890 clone without CLONE_THREAD, we send one for each thread. For
891 years, we used PTRACE_KILL only, so we're being a bit paranoid
892 about some old kernels where PTRACE_KILL might work better
893 (dubious if there are any such, but that's why it's paranoia), so
894 we try SIGKILL first, PTRACE_KILL second, and so we're fine
900 debug_printf ("LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
901 target_pid_to_str (ptid_of (thr
)),
902 errno
? strerror (errno
) : "OK");
905 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
907 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
908 target_pid_to_str (ptid_of (thr
)),
909 errno
? strerror (errno
) : "OK");
912 /* Kill LWP and wait for it to die. */
915 kill_wait_lwp (struct lwp_info
*lwp
)
917 struct thread_info
*thr
= get_lwp_thread (lwp
);
918 int pid
= ptid_get_pid (ptid_of (thr
));
919 int lwpid
= ptid_get_lwp (ptid_of (thr
));
924 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
928 linux_kill_one_lwp (lwp
);
930 /* Make sure it died. Notes:
932 - The loop is most likely unnecessary.
934 - We don't use linux_wait_for_event as that could delete lwps
935 while we're iterating over them. We're not interested in
936 any pending status at this point, only in making sure all
937 wait status on the kernel side are collected until the
940 - We don't use __WALL here as the __WALL emulation relies on
941 SIGCHLD, and killing a stopped process doesn't generate
942 one, nor an exit status.
944 res
= my_waitpid (lwpid
, &wstat
, 0);
945 if (res
== -1 && errno
== ECHILD
)
946 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
947 } while (res
> 0 && WIFSTOPPED (wstat
));
949 gdb_assert (res
> 0);
952 /* Callback for `find_inferior'. Kills an lwp of a given process,
953 except the leader. */
956 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
958 struct thread_info
*thread
= (struct thread_info
*) entry
;
959 struct lwp_info
*lwp
= get_thread_lwp (thread
);
960 int pid
= * (int *) args
;
962 if (ptid_get_pid (entry
->id
) != pid
)
965 /* We avoid killing the first thread here, because of a Linux kernel (at
966 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
967 the children get a chance to be reaped, it will remain a zombie
970 if (lwpid_of (thread
) == pid
)
973 debug_printf ("lkop: is last of process %s\n",
974 target_pid_to_str (entry
->id
));
985 struct process_info
*process
;
986 struct lwp_info
*lwp
;
988 process
= find_process_pid (pid
);
992 /* If we're killing a running inferior, make sure it is stopped
993 first, as PTRACE_KILL will not work otherwise. */
994 stop_all_lwps (0, NULL
);
996 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
998 /* See the comment in linux_kill_one_lwp. We did not kill the first
999 thread in the list, so do so now. */
1000 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1005 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1009 kill_wait_lwp (lwp
);
1011 the_target
->mourn (process
);
1013 /* Since we presently can only stop all lwps of all processes, we
1014 need to unstop lwps of other processes. */
1015 unstop_all_lwps (0, NULL
);
1019 /* Get pending signal of THREAD, for detaching purposes. This is the
1020 signal the thread last stopped for, which we need to deliver to the
1021 thread when detaching, otherwise, it'd be suppressed/lost. */
1024 get_detach_signal (struct thread_info
*thread
)
1026 enum gdb_signal signo
= GDB_SIGNAL_0
;
1028 struct lwp_info
*lp
= get_thread_lwp (thread
);
1030 if (lp
->status_pending_p
)
1031 status
= lp
->status_pending
;
1034 /* If the thread had been suspended by gdbserver, and it stopped
1035 cleanly, then it'll have stopped with SIGSTOP. But we don't
1036 want to deliver that SIGSTOP. */
1037 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1038 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1041 /* Otherwise, we may need to deliver the signal we
1043 status
= lp
->last_status
;
1046 if (!WIFSTOPPED (status
))
1049 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1050 target_pid_to_str (ptid_of (thread
)));
1054 /* Extended wait statuses aren't real SIGTRAPs. */
1055 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1058 debug_printf ("GPS: lwp %s had stopped with extended "
1059 "status: no pending signal\n",
1060 target_pid_to_str (ptid_of (thread
)));
1064 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1066 if (program_signals_p
&& !program_signals
[signo
])
1069 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1070 target_pid_to_str (ptid_of (thread
)),
1071 gdb_signal_to_string (signo
));
1074 else if (!program_signals_p
1075 /* If we have no way to know which signals GDB does not
1076 want to have passed to the program, assume
1077 SIGTRAP/SIGINT, which is GDB's default. */
1078 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1081 debug_printf ("GPS: lwp %s had signal %s, "
1082 "but we don't know if we should pass it. "
1083 "Default to not.\n",
1084 target_pid_to_str (ptid_of (thread
)),
1085 gdb_signal_to_string (signo
));
1091 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1092 target_pid_to_str (ptid_of (thread
)),
1093 gdb_signal_to_string (signo
));
1095 return WSTOPSIG (status
);
1100 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1102 struct thread_info
*thread
= (struct thread_info
*) entry
;
1103 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1104 int pid
= * (int *) args
;
1107 if (ptid_get_pid (entry
->id
) != pid
)
1110 /* If there is a pending SIGSTOP, get rid of it. */
1111 if (lwp
->stop_expected
)
1114 debug_printf ("Sending SIGCONT to %s\n",
1115 target_pid_to_str (ptid_of (thread
)));
1117 kill_lwp (lwpid_of (thread
), SIGCONT
);
1118 lwp
->stop_expected
= 0;
1121 /* Flush any pending changes to the process's registers. */
1122 regcache_invalidate_thread (thread
);
1124 /* Pass on any pending signal for this thread. */
1125 sig
= get_detach_signal (thread
);
1127 /* Finally, let it resume. */
1128 if (the_low_target
.prepare_to_resume
!= NULL
)
1129 the_low_target
.prepare_to_resume (lwp
);
1130 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1131 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1132 error (_("Can't detach %s: %s"),
1133 target_pid_to_str (ptid_of (thread
)),
1141 linux_detach (int pid
)
1143 struct process_info
*process
;
1145 process
= find_process_pid (pid
);
1146 if (process
== NULL
)
1149 /* Stop all threads before detaching. First, ptrace requires that
1150 the thread is stopped to sucessfully detach. Second, thread_db
1151 may need to uninstall thread event breakpoints from memory, which
1152 only works with a stopped process anyway. */
1153 stop_all_lwps (0, NULL
);
1155 #ifdef USE_THREAD_DB
1156 thread_db_detach (process
);
1159 /* Stabilize threads (move out of jump pads). */
1160 stabilize_threads ();
1162 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1164 the_target
->mourn (process
);
1166 /* Since we presently can only stop all lwps of all processes, we
1167 need to unstop lwps of other processes. */
1168 unstop_all_lwps (0, NULL
);
1172 /* Remove all LWPs that belong to process PROC from the lwp list. */
1175 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1177 struct thread_info
*thread
= (struct thread_info
*) entry
;
1178 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1179 struct process_info
*process
= proc
;
1181 if (pid_of (thread
) == pid_of (process
))
1188 linux_mourn (struct process_info
*process
)
1190 struct process_info_private
*priv
;
1192 #ifdef USE_THREAD_DB
1193 thread_db_mourn (process
);
1196 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1198 /* Freeing all private data. */
1199 priv
= process
->private;
1200 free (priv
->arch_private
);
1202 process
->private = NULL
;
1204 remove_process (process
);
1208 linux_join (int pid
)
1213 ret
= my_waitpid (pid
, &status
, 0);
1214 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1216 } while (ret
!= -1 || errno
!= ECHILD
);
1219 /* Return nonzero if the given thread is still alive. */
1221 linux_thread_alive (ptid_t ptid
)
1223 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1225 /* We assume we always know if a thread exits. If a whole process
1226 exited but we still haven't been able to report it to GDB, we'll
1227 hold on to the last lwp of the dead process. */
1234 /* Return 1 if this lwp has an interesting status pending. */
1236 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1238 struct thread_info
*thread
= (struct thread_info
*) entry
;
1239 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1240 ptid_t ptid
= * (ptid_t
*) arg
;
1242 /* Check if we're only interested in events from a specific process
1244 if (!ptid_equal (minus_one_ptid
, ptid
)
1245 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1248 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1249 report any status pending the LWP may have. */
1250 if (thread
->last_resume_kind
== resume_stop
1251 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1254 return lwp
->status_pending_p
;
1258 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1260 ptid_t ptid
= *(ptid_t
*) data
;
1263 if (ptid_get_lwp (ptid
) != 0)
1264 lwp
= ptid_get_lwp (ptid
);
1266 lwp
= ptid_get_pid (ptid
);
1268 if (ptid_get_lwp (entry
->id
) == lwp
)
1275 find_lwp_pid (ptid_t ptid
)
1277 struct inferior_list_entry
*thread
1278 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1283 return get_thread_lwp ((struct thread_info
*) thread
);
1286 /* Return the number of known LWPs in the tgid given by PID. */
1291 struct inferior_list_entry
*inf
, *tmp
;
1294 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1296 if (ptid_get_pid (inf
->id
) == pid
)
1303 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1304 their exits until all other threads in the group have exited. */
1307 check_zombie_leaders (void)
1309 struct process_info
*proc
, *tmp
;
1311 ALL_PROCESSES (proc
, tmp
)
1313 pid_t leader_pid
= pid_of (proc
);
1314 struct lwp_info
*leader_lp
;
1316 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1319 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1320 "num_lwps=%d, zombie=%d\n",
1321 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1322 linux_proc_pid_is_zombie (leader_pid
));
1324 if (leader_lp
!= NULL
1325 /* Check if there are other threads in the group, as we may
1326 have raced with the inferior simply exiting. */
1327 && !last_thread_of_process_p (leader_pid
)
1328 && linux_proc_pid_is_zombie (leader_pid
))
1330 /* A leader zombie can mean one of two things:
1332 - It exited, and there's an exit status pending
1333 available, or only the leader exited (not the whole
1334 program). In the latter case, we can't waitpid the
1335 leader's exit status until all other threads are gone.
1337 - There are 3 or more threads in the group, and a thread
1338 other than the leader exec'd. On an exec, the Linux
1339 kernel destroys all other threads (except the execing
1340 one) in the thread group, and resets the execing thread's
1341 tid to the tgid. No exit notification is sent for the
1342 execing thread -- from the ptracer's perspective, it
1343 appears as though the execing thread just vanishes.
1344 Until we reap all other threads except the leader and the
1345 execing thread, the leader will be zombie, and the
1346 execing thread will be in `D (disc sleep)'. As soon as
1347 all other threads are reaped, the execing thread changes
1348 it's tid to the tgid, and the previous (zombie) leader
1349 vanishes, giving place to the "new" leader. We could try
1350 distinguishing the exit and exec cases, by waiting once
1351 more, and seeing if something comes out, but it doesn't
1352 sound useful. The previous leader _does_ go away, and
1353 we'll re-add the new one once we see the exec event
1354 (which is just the same as what would happen if the
1355 previous leader did exit voluntarily before some other
1360 "CZL: Thread group leader %d zombie "
1361 "(it exited, or another thread execd).\n",
1364 delete_lwp (leader_lp
);
1369 /* Callback for `find_inferior'. Returns the first LWP that is not
1370 stopped. ARG is a PTID filter. */
1373 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1375 struct thread_info
*thr
= (struct thread_info
*) entry
;
1376 struct lwp_info
*lwp
;
1377 ptid_t filter
= *(ptid_t
*) arg
;
1379 if (!ptid_match (ptid_of (thr
), filter
))
1382 lwp
= get_thread_lwp (thr
);
1389 /* This function should only be called if the LWP got a SIGTRAP.
1391 Handle any tracepoint steps or hits. Return true if a tracepoint
1392 event was handled, 0 otherwise. */
1395 handle_tracepoints (struct lwp_info
*lwp
)
1397 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1398 int tpoint_related_event
= 0;
1400 /* If this tracepoint hit causes a tracing stop, we'll immediately
1401 uninsert tracepoints. To do this, we temporarily pause all
1402 threads, unpatch away, and then unpause threads. We need to make
1403 sure the unpausing doesn't resume LWP too. */
1406 /* And we need to be sure that any all-threads-stopping doesn't try
1407 to move threads out of the jump pads, as it could deadlock the
1408 inferior (LWP could be in the jump pad, maybe even holding the
1411 /* Do any necessary step collect actions. */
1412 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1414 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1416 /* See if we just hit a tracepoint and do its main collect
1418 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1422 gdb_assert (lwp
->suspended
== 0);
1423 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1425 if (tpoint_related_event
)
1428 debug_printf ("got a tracepoint event\n");
1435 /* Convenience wrapper. Returns true if LWP is presently collecting a
1439 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1440 struct fast_tpoint_collect_status
*status
)
1442 CORE_ADDR thread_area
;
1443 struct thread_info
*thread
= get_lwp_thread (lwp
);
1445 if (the_low_target
.get_thread_area
== NULL
)
1448 /* Get the thread area address. This is used to recognize which
1449 thread is which when tracing with the in-process agent library.
1450 We don't read anything from the address, and treat it as opaque;
1451 it's the address itself that we assume is unique per-thread. */
1452 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1455 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1458 /* The reason we resume in the caller, is because we want to be able
1459 to pass lwp->status_pending as WSTAT, and we need to clear
1460 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1461 refuses to resume. */
1464 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1466 struct thread_info
*saved_inferior
;
1468 saved_inferior
= current_inferior
;
1469 current_inferior
= get_lwp_thread (lwp
);
1472 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1473 && supports_fast_tracepoints ()
1474 && agent_loaded_p ())
1476 struct fast_tpoint_collect_status status
;
1480 debug_printf ("Checking whether LWP %ld needs to move out of the "
1482 lwpid_of (current_inferior
));
1484 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1487 || (WSTOPSIG (*wstat
) != SIGILL
1488 && WSTOPSIG (*wstat
) != SIGFPE
1489 && WSTOPSIG (*wstat
) != SIGSEGV
1490 && WSTOPSIG (*wstat
) != SIGBUS
))
1492 lwp
->collecting_fast_tracepoint
= r
;
1496 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1498 /* Haven't executed the original instruction yet.
1499 Set breakpoint there, and wait till it's hit,
1500 then single-step until exiting the jump pad. */
1501 lwp
->exit_jump_pad_bkpt
1502 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1506 debug_printf ("Checking whether LWP %ld needs to move out of "
1507 "the jump pad...it does\n",
1508 lwpid_of (current_inferior
));
1509 current_inferior
= saved_inferior
;
1516 /* If we get a synchronous signal while collecting, *and*
1517 while executing the (relocated) original instruction,
1518 reset the PC to point at the tpoint address, before
1519 reporting to GDB. Otherwise, it's an IPA lib bug: just
1520 report the signal to GDB, and pray for the best. */
1522 lwp
->collecting_fast_tracepoint
= 0;
1525 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1526 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1529 struct regcache
*regcache
;
1531 /* The si_addr on a few signals references the address
1532 of the faulting instruction. Adjust that as
1534 if ((WSTOPSIG (*wstat
) == SIGILL
1535 || WSTOPSIG (*wstat
) == SIGFPE
1536 || WSTOPSIG (*wstat
) == SIGBUS
1537 || WSTOPSIG (*wstat
) == SIGSEGV
)
1538 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
1539 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1540 /* Final check just to make sure we don't clobber
1541 the siginfo of non-kernel-sent signals. */
1542 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1544 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1545 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_inferior
),
1546 (PTRACE_TYPE_ARG3
) 0, &info
);
1549 regcache
= get_thread_regcache (current_inferior
, 1);
1550 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1551 lwp
->stop_pc
= status
.tpoint_addr
;
1553 /* Cancel any fast tracepoint lock this thread was
1555 force_unlock_trace_buffer ();
1558 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1561 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1562 "stopping all threads momentarily.\n");
1564 stop_all_lwps (1, lwp
);
1565 cancel_breakpoints ();
1567 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1568 lwp
->exit_jump_pad_bkpt
= NULL
;
1570 unstop_all_lwps (1, lwp
);
1572 gdb_assert (lwp
->suspended
>= 0);
1578 debug_printf ("Checking whether LWP %ld needs to move out of the "
1580 lwpid_of (current_inferior
));
1582 current_inferior
= saved_inferior
;
1586 /* Enqueue one signal in the "signals to report later when out of the
1590 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1592 struct pending_signals
*p_sig
;
1593 struct thread_info
*thread
= get_lwp_thread (lwp
);
1596 debug_printf ("Deferring signal %d for LWP %ld.\n",
1597 WSTOPSIG (*wstat
), lwpid_of (thread
));
1601 struct pending_signals
*sig
;
1603 for (sig
= lwp
->pending_signals_to_report
;
1606 debug_printf (" Already queued %d\n",
1609 debug_printf (" (no more currently queued signals)\n");
1612 /* Don't enqueue non-RT signals if they are already in the deferred
1613 queue. (SIGSTOP being the easiest signal to see ending up here
1615 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1617 struct pending_signals
*sig
;
1619 for (sig
= lwp
->pending_signals_to_report
;
1623 if (sig
->signal
== WSTOPSIG (*wstat
))
1626 debug_printf ("Not requeuing already queued non-RT signal %d"
1635 p_sig
= xmalloc (sizeof (*p_sig
));
1636 p_sig
->prev
= lwp
->pending_signals_to_report
;
1637 p_sig
->signal
= WSTOPSIG (*wstat
);
1638 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1639 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1642 lwp
->pending_signals_to_report
= p_sig
;
1645 /* Dequeue one signal from the "signals to report later when out of
1646 the jump pad" list. */
1649 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1651 struct thread_info
*thread
= get_lwp_thread (lwp
);
1653 if (lwp
->pending_signals_to_report
!= NULL
)
1655 struct pending_signals
**p_sig
;
1657 p_sig
= &lwp
->pending_signals_to_report
;
1658 while ((*p_sig
)->prev
!= NULL
)
1659 p_sig
= &(*p_sig
)->prev
;
1661 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1662 if ((*p_sig
)->info
.si_signo
!= 0)
1663 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1669 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1670 WSTOPSIG (*wstat
), lwpid_of (thread
));
1674 struct pending_signals
*sig
;
1676 for (sig
= lwp
->pending_signals_to_report
;
1679 debug_printf (" Still queued %d\n",
1682 debug_printf (" (no more queued signals)\n");
1691 /* Arrange for a breakpoint to be hit again later. We don't keep the
1692 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1693 will handle the current event, eventually we will resume this LWP,
1694 and this breakpoint will trap again. */
1697 cancel_breakpoint (struct lwp_info
*lwp
)
1699 struct thread_info
*saved_inferior
;
1701 /* There's nothing to do if we don't support breakpoints. */
1702 if (!supports_breakpoints ())
1705 /* breakpoint_at reads from current inferior. */
1706 saved_inferior
= current_inferior
;
1707 current_inferior
= get_lwp_thread (lwp
);
1709 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1712 debug_printf ("CB: Push back breakpoint for %s\n",
1713 target_pid_to_str (ptid_of (current_inferior
)));
1715 /* Back up the PC if necessary. */
1716 if (the_low_target
.decr_pc_after_break
)
1718 struct regcache
*regcache
1719 = get_thread_regcache (current_inferior
, 1);
1720 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1723 current_inferior
= saved_inferior
;
1729 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1730 paddress (lwp
->stop_pc
),
1731 target_pid_to_str (ptid_of (current_inferior
)));
1734 current_inferior
= saved_inferior
;
1738 /* Do low-level handling of the event, and check if we should go on
1739 and pass it to caller code. Return the affected lwp if we are, or
1742 static struct lwp_info
*
1743 linux_low_filter_event (ptid_t filter_ptid
, int lwpid
, int wstat
)
1745 struct lwp_info
*child
;
1746 struct thread_info
*thread
;
1748 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1750 /* If we didn't find a process, one of two things presumably happened:
1751 - A process we started and then detached from has exited. Ignore it.
1752 - A process we are controlling has forked and the new child's stop
1753 was reported to us by the kernel. Save its PID. */
1754 if (child
== NULL
&& WIFSTOPPED (wstat
))
1756 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1759 else if (child
== NULL
)
1762 thread
= get_lwp_thread (child
);
1766 child
->last_status
= wstat
;
1768 if (WIFSTOPPED (wstat
))
1770 struct process_info
*proc
;
1772 /* Architecture-specific setup after inferior is running. This
1773 needs to happen after we have attached to the inferior and it
1774 is stopped for the first time, but before we access any
1775 inferior registers. */
1776 proc
= find_process_pid (pid_of (thread
));
1777 if (proc
->private->new_inferior
)
1779 struct thread_info
*saved_inferior
;
1781 saved_inferior
= current_inferior
;
1782 current_inferior
= thread
;
1784 the_low_target
.arch_setup ();
1786 current_inferior
= saved_inferior
;
1788 proc
->private->new_inferior
= 0;
1792 /* Store the STOP_PC, with adjustment applied. This depends on the
1793 architecture being defined already (so that CHILD has a valid
1794 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1796 if (WIFSTOPPED (wstat
))
1799 && the_low_target
.get_pc
!= NULL
)
1801 struct thread_info
*saved_inferior
;
1802 struct regcache
*regcache
;
1805 saved_inferior
= current_inferior
;
1806 current_inferior
= thread
;
1807 regcache
= get_thread_regcache (current_inferior
, 1);
1808 pc
= (*the_low_target
.get_pc
) (regcache
);
1809 debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc
);
1810 current_inferior
= saved_inferior
;
1813 child
->stop_pc
= get_stop_pc (child
);
1816 /* Fetch the possibly triggered data watchpoint info and store it in
1819 On some archs, like x86, that use debug registers to set
1820 watchpoints, it's possible that the way to know which watched
1821 address trapped, is to check the register that is used to select
1822 which address to watch. Problem is, between setting the
1823 watchpoint and reading back which data address trapped, the user
1824 may change the set of watchpoints, and, as a consequence, GDB
1825 changes the debug registers in the inferior. To avoid reading
1826 back a stale stopped-data-address when that happens, we cache in
1827 LP the fact that a watchpoint trapped, and the corresponding data
1828 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1829 changes the debug registers meanwhile, we have the cached data we
1832 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
)
1834 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1836 child
->stopped_by_watchpoint
= 0;
1840 struct thread_info
*saved_inferior
;
1842 saved_inferior
= current_inferior
;
1843 current_inferior
= thread
;
1845 child
->stopped_by_watchpoint
1846 = the_low_target
.stopped_by_watchpoint ();
1848 if (child
->stopped_by_watchpoint
)
1850 if (the_low_target
.stopped_data_address
!= NULL
)
1851 child
->stopped_data_address
1852 = the_low_target
.stopped_data_address ();
1854 child
->stopped_data_address
= 0;
1857 current_inferior
= saved_inferior
;
1861 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1863 linux_enable_event_reporting (lwpid
);
1864 child
->must_set_ptrace_flags
= 0;
1867 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1868 && wstat
>> 16 != 0)
1870 handle_extended_wait (child
, wstat
);
1874 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1875 && child
->stop_expected
)
1878 debug_printf ("Expected stop.\n");
1879 child
->stop_expected
= 0;
1881 if (thread
->last_resume_kind
== resume_stop
)
1883 /* We want to report the stop to the core. Treat the
1884 SIGSTOP as a normal event. */
1886 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1888 /* Stopping threads. We don't want this SIGSTOP to end up
1889 pending in the FILTER_PTID handling below. */
1894 /* Filter out the event. */
1895 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1900 /* Check if the thread has exited. */
1901 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1902 && num_lwps (pid_of (thread
)) > 1)
1905 debug_printf ("LLW: %d exited.\n", lwpid
);
1907 /* If there is at least one more LWP, then the exit signal
1908 was not the end of the debugged application and should be
1914 if (!ptid_match (ptid_of (thread
), filter_ptid
))
1917 debug_printf ("LWP %d got an event %06x, leaving pending.\n",
1920 if (WIFSTOPPED (wstat
))
1922 child
->status_pending_p
= 1;
1923 child
->status_pending
= wstat
;
1925 if (WSTOPSIG (wstat
) != SIGSTOP
)
1927 /* Cancel breakpoint hits. The breakpoint may be
1928 removed before we fetch events from this process to
1929 report to the core. It is best not to assume the
1930 moribund breakpoints heuristic always handles these
1931 cases --- it could be too many events go through to
1932 the core before this one is handled. All-stop always
1933 cancels breakpoint hits in all threads. */
1935 && WSTOPSIG (wstat
) == SIGTRAP
1936 && cancel_breakpoint (child
))
1938 /* Throw away the SIGTRAP. */
1939 child
->status_pending_p
= 0;
1942 debug_printf ("LLW: LWP %d hit a breakpoint while"
1943 " waiting for another process;"
1944 " cancelled it\n", lwpid
);
1948 else if (WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1951 debug_printf ("LLWE: process %d exited while fetching "
1952 "event from another LWP\n", lwpid
);
1954 /* This was the last lwp in the process. Since events are
1955 serialized to GDB core, and we can't report this one
1956 right now, but GDB core and the other target layers will
1957 want to be notified about the exit code/signal, leave the
1958 status pending for the next time we're able to report
1960 mark_lwp_dead (child
, wstat
);
1969 /* When the event-loop is doing a step-over, this points at the thread
1971 ptid_t step_over_bkpt
;
1973 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1974 match FILTER_PTID (leaving others pending). The PTIDs can be:
1975 minus_one_ptid, to specify any child; a pid PTID, specifying all
1976 lwps of a thread group; or a PTID representing a single lwp. Store
1977 the stop status through the status pointer WSTAT. OPTIONS is
1978 passed to the waitpid call. Return 0 if no event was found and
1979 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1980 was found. Return the PID of the stopped child otherwise. */
1983 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1984 int *wstatp
, int options
)
1986 struct thread_info
*event_thread
;
1987 struct lwp_info
*event_child
, *requested_child
;
1988 sigset_t block_mask
, prev_mask
;
1991 /* N.B. event_thread points to the thread_info struct that contains
1992 event_child. Keep them in sync. */
1993 event_thread
= NULL
;
1995 requested_child
= NULL
;
1997 /* Check for a lwp with a pending status. */
1999 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2001 event_thread
= (struct thread_info
*)
2002 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2003 if (event_thread
!= NULL
)
2004 event_child
= get_thread_lwp (event_thread
);
2005 if (debug_threads
&& event_thread
)
2006 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2008 else if (!ptid_equal (filter_ptid
, null_ptid
))
2010 requested_child
= find_lwp_pid (filter_ptid
);
2012 if (stopping_threads
== NOT_STOPPING_THREADS
2013 && requested_child
->status_pending_p
2014 && requested_child
->collecting_fast_tracepoint
)
2016 enqueue_one_deferred_signal (requested_child
,
2017 &requested_child
->status_pending
);
2018 requested_child
->status_pending_p
= 0;
2019 requested_child
->status_pending
= 0;
2020 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2023 if (requested_child
->suspended
2024 && requested_child
->status_pending_p
)
2025 fatal ("requesting an event out of a suspended child?");
2027 if (requested_child
->status_pending_p
)
2029 event_child
= requested_child
;
2030 event_thread
= get_lwp_thread (event_child
);
2034 if (event_child
!= NULL
)
2037 debug_printf ("Got an event from pending child %ld (%04x)\n",
2038 lwpid_of (event_thread
), event_child
->status_pending
);
2039 *wstatp
= event_child
->status_pending
;
2040 event_child
->status_pending_p
= 0;
2041 event_child
->status_pending
= 0;
2042 current_inferior
= event_thread
;
2043 return lwpid_of (event_thread
);
2046 /* But if we don't find a pending event, we'll have to wait.
2048 We only enter this loop if no process has a pending wait status.
2049 Thus any action taken in response to a wait status inside this
2050 loop is responding as soon as we detect the status, not after any
2053 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2054 all signals while here. */
2055 sigfillset (&block_mask
);
2056 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2058 while (event_child
== NULL
)
2062 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2065 - If the thread group leader exits while other threads in the
2066 thread group still exist, waitpid(TGID, ...) hangs. That
2067 waitpid won't return an exit status until the other threads
2068 in the group are reaped.
2070 - When a non-leader thread execs, that thread just vanishes
2071 without reporting an exit (so we'd hang if we waited for it
2072 explicitly in that case). The exec event is reported to
2073 the TGID pid (although we don't currently enable exec
2076 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2079 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2080 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2086 debug_printf ("LLW: waitpid %ld received %s\n",
2087 (long) ret
, status_to_str (*wstatp
));
2090 event_child
= linux_low_filter_event (filter_ptid
,
2092 if (event_child
!= NULL
)
2094 /* We got an event to report to the core. */
2095 event_thread
= get_lwp_thread (event_child
);
2099 /* Retry until nothing comes out of waitpid. A single
2100 SIGCHLD can indicate more than one child stopped. */
2104 /* Check for zombie thread group leaders. Those can't be reaped
2105 until all other threads in the thread group are. */
2106 check_zombie_leaders ();
2108 /* If there are no resumed children left in the set of LWPs we
2109 want to wait for, bail. We can't just block in
2110 waitpid/sigsuspend, because lwps might have been left stopped
2111 in trace-stop state, and we'd be stuck forever waiting for
2112 their status to change (which would only happen if we resumed
2113 them). Even if WNOHANG is set, this return code is preferred
2114 over 0 (below), as it is more detailed. */
2115 if ((find_inferior (&all_threads
,
2116 not_stopped_callback
,
2117 &wait_ptid
) == NULL
))
2120 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2121 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2125 /* No interesting event to report to the caller. */
2126 if ((options
& WNOHANG
))
2129 debug_printf ("WNOHANG set, no event found\n");
2131 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2135 /* Block until we get an event reported with SIGCHLD. */
2137 debug_printf ("sigsuspend'ing\n");
2139 sigsuspend (&prev_mask
);
2140 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2144 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2146 current_inferior
= event_thread
;
2148 /* Check for thread exit. */
2149 if (! WIFSTOPPED (*wstatp
))
2151 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2154 debug_printf ("LWP %d is the last lwp of process. "
2155 "Process %ld exiting.\n",
2156 pid_of (event_thread
), lwpid_of (event_thread
));
2157 return lwpid_of (event_thread
);
2160 return lwpid_of (event_thread
);
2163 /* Wait for an event from child(ren) PTID. PTIDs can be:
2164 minus_one_ptid, to specify any child; a pid PTID, specifying all
2165 lwps of a thread group; or a PTID representing a single lwp. Store
2166 the stop status through the status pointer WSTAT. OPTIONS is
2167 passed to the waitpid call. Return 0 if no event was found and
2168 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2169 was found. Return the PID of the stopped child otherwise. */
2172 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2174 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2177 /* Count the LWP's that have had events. */
2180 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2182 struct thread_info
*thread
= (struct thread_info
*) entry
;
2183 struct lwp_info
*lp
= get_thread_lwp (thread
);
2186 gdb_assert (count
!= NULL
);
2188 /* Count only resumed LWPs that have a SIGTRAP event pending that
2189 should be reported to GDB. */
2190 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2191 && thread
->last_resume_kind
!= resume_stop
2192 && lp
->status_pending_p
2193 && WIFSTOPPED (lp
->status_pending
)
2194 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2195 && !breakpoint_inserted_here (lp
->stop_pc
))
2201 /* Select the LWP (if any) that is currently being single-stepped. */
2204 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2206 struct thread_info
*thread
= (struct thread_info
*) entry
;
2207 struct lwp_info
*lp
= get_thread_lwp (thread
);
2209 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2210 && thread
->last_resume_kind
== resume_step
2211 && lp
->status_pending_p
)
2217 /* Select the Nth LWP that has had a SIGTRAP event that should be
2221 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2223 struct thread_info
*thread
= (struct thread_info
*) entry
;
2224 struct lwp_info
*lp
= get_thread_lwp (thread
);
2225 int *selector
= data
;
2227 gdb_assert (selector
!= NULL
);
2229 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2230 if (thread
->last_resume_kind
!= resume_stop
2231 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2232 && lp
->status_pending_p
2233 && WIFSTOPPED (lp
->status_pending
)
2234 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2235 && !breakpoint_inserted_here (lp
->stop_pc
))
2236 if ((*selector
)-- == 0)
2243 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2245 struct thread_info
*thread
= (struct thread_info
*) entry
;
2246 struct lwp_info
*lp
= get_thread_lwp (thread
);
2247 struct lwp_info
*event_lp
= data
;
2249 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2253 /* If a LWP other than the LWP that we're reporting an event for has
2254 hit a GDB breakpoint (as opposed to some random trap signal),
2255 then just arrange for it to hit it again later. We don't keep
2256 the SIGTRAP status and don't forward the SIGTRAP signal to the
2257 LWP. We will handle the current event, eventually we will resume
2258 all LWPs, and this one will get its breakpoint trap again.
2260 If we do not do this, then we run the risk that the user will
2261 delete or disable the breakpoint, but the LWP will have already
2264 if (thread
->last_resume_kind
!= resume_stop
2265 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2266 && lp
->status_pending_p
2267 && WIFSTOPPED (lp
->status_pending
)
2268 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2270 && !lp
->stopped_by_watchpoint
2271 && cancel_breakpoint (lp
))
2272 /* Throw away the SIGTRAP. */
2273 lp
->status_pending_p
= 0;
2279 linux_cancel_breakpoints (void)
2281 find_inferior (&all_threads
, cancel_breakpoints_callback
, NULL
);
2284 /* Select one LWP out of those that have events pending. */
2287 select_event_lwp (struct lwp_info
**orig_lp
)
2290 int random_selector
;
2291 struct thread_info
*event_thread
;
2293 /* Give preference to any LWP that is being single-stepped. */
2295 = (struct thread_info
*) find_inferior (&all_threads
,
2296 select_singlestep_lwp_callback
,
2298 if (event_thread
!= NULL
)
2301 debug_printf ("SEL: Select single-step %s\n",
2302 target_pid_to_str (ptid_of (event_thread
)));
2306 /* No single-stepping LWP. Select one at random, out of those
2307 which have had SIGTRAP events. */
2309 /* First see how many SIGTRAP events we have. */
2310 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2312 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2313 random_selector
= (int)
2314 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2316 if (debug_threads
&& num_events
> 1)
2317 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2318 num_events
, random_selector
);
2321 = (struct thread_info
*) find_inferior (&all_threads
,
2322 select_event_lwp_callback
,
2326 if (event_thread
!= NULL
)
2328 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2330 /* Switch the event LWP. */
2331 *orig_lp
= event_lp
;
2335 /* Decrement the suspend count of an LWP. */
2338 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2340 struct thread_info
*thread
= (struct thread_info
*) entry
;
2341 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2343 /* Ignore EXCEPT. */
2349 gdb_assert (lwp
->suspended
>= 0);
2353 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2357 unsuspend_all_lwps (struct lwp_info
*except
)
2359 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2362 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2363 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2365 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2366 static ptid_t
linux_wait_1 (ptid_t ptid
,
2367 struct target_waitstatus
*ourstatus
,
2368 int target_options
);
2370 /* Stabilize threads (move out of jump pads).
2372 If a thread is midway collecting a fast tracepoint, we need to
2373 finish the collection and move it out of the jump pad before
2374 reporting the signal.
2376 This avoids recursion while collecting (when a signal arrives
2377 midway, and the signal handler itself collects), which would trash
2378 the trace buffer. In case the user set a breakpoint in a signal
2379 handler, this avoids the backtrace showing the jump pad, etc..
2380 Most importantly, there are certain things we can't do safely if
2381 threads are stopped in a jump pad (or in its callee's). For
2384 - starting a new trace run. A thread still collecting the
2385 previous run, could trash the trace buffer when resumed. The trace
2386 buffer control structures would have been reset but the thread had
2387 no way to tell. The thread could even midway memcpy'ing to the
2388 buffer, which would mean that when resumed, it would clobber the
2389 trace buffer that had been set for a new run.
2391 - we can't rewrite/reuse the jump pads for new tracepoints
2392 safely. Say you do tstart while a thread is stopped midway while
2393 collecting. When the thread is later resumed, it finishes the
2394 collection, and returns to the jump pad, to execute the original
2395 instruction that was under the tracepoint jump at the time the
2396 older run had been started. If the jump pad had been rewritten
2397 since for something else in the new run, the thread would now
2398 execute the wrong / random instructions. */
2401 linux_stabilize_threads (void)
2403 struct thread_info
*save_inferior
;
2404 struct thread_info
*thread_stuck
;
2407 = (struct thread_info
*) find_inferior (&all_threads
,
2408 stuck_in_jump_pad_callback
,
2410 if (thread_stuck
!= NULL
)
2413 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2414 lwpid_of (thread_stuck
));
2418 save_inferior
= current_inferior
;
2420 stabilizing_threads
= 1;
2423 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2425 /* Loop until all are stopped out of the jump pads. */
2426 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2428 struct target_waitstatus ourstatus
;
2429 struct lwp_info
*lwp
;
2432 /* Note that we go through the full wait even loop. While
2433 moving threads out of jump pad, we need to be able to step
2434 over internal breakpoints and such. */
2435 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2437 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2439 lwp
= get_thread_lwp (current_inferior
);
2444 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2445 || current_inferior
->last_resume_kind
== resume_stop
)
2447 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2448 enqueue_one_deferred_signal (lwp
, &wstat
);
2453 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2455 stabilizing_threads
= 0;
2457 current_inferior
= save_inferior
;
2462 = (struct thread_info
*) find_inferior (&all_threads
,
2463 stuck_in_jump_pad_callback
,
2465 if (thread_stuck
!= NULL
)
2466 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2467 lwpid_of (thread_stuck
));
2471 /* Wait for process, returns status. */
2474 linux_wait_1 (ptid_t ptid
,
2475 struct target_waitstatus
*ourstatus
, int target_options
)
2478 struct lwp_info
*event_child
;
2481 int step_over_finished
;
2482 int bp_explains_trap
;
2483 int maybe_internal_trap
;
2491 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2494 /* Translate generic target options into linux options. */
2496 if (target_options
& TARGET_WNOHANG
)
2500 bp_explains_trap
= 0;
2503 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2505 /* If we were only supposed to resume one thread, only wait for
2506 that thread - if it's still alive. If it died, however - which
2507 can happen if we're coming from the thread death case below -
2508 then we need to make sure we restart the other threads. We could
2509 pick a thread at random or restart all; restarting all is less
2512 && !ptid_equal (cont_thread
, null_ptid
)
2513 && !ptid_equal (cont_thread
, minus_one_ptid
))
2515 struct thread_info
*thread
;
2517 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2520 /* No stepping, no signal - unless one is pending already, of course. */
2523 struct thread_resume resume_info
;
2524 resume_info
.thread
= minus_one_ptid
;
2525 resume_info
.kind
= resume_continue
;
2526 resume_info
.sig
= 0;
2527 linux_resume (&resume_info
, 1);
2533 if (ptid_equal (step_over_bkpt
, null_ptid
))
2534 pid
= linux_wait_for_event (ptid
, &w
, options
);
2538 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2539 target_pid_to_str (step_over_bkpt
));
2540 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2545 gdb_assert (target_options
& TARGET_WNOHANG
);
2549 debug_printf ("linux_wait_1 ret = null_ptid, "
2550 "TARGET_WAITKIND_IGNORE\n");
2554 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2561 debug_printf ("linux_wait_1 ret = null_ptid, "
2562 "TARGET_WAITKIND_NO_RESUMED\n");
2566 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2570 event_child
= get_thread_lwp (current_inferior
);
2572 /* linux_wait_for_event only returns an exit status for the last
2573 child of a process. Report it. */
2574 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2578 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2579 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2583 debug_printf ("linux_wait_1 ret = %s, exited with "
2585 target_pid_to_str (ptid_of (current_inferior
)),
2592 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2593 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2597 debug_printf ("linux_wait_1 ret = %s, terminated with "
2599 target_pid_to_str (ptid_of (current_inferior
)),
2605 return ptid_of (current_inferior
);
2608 /* If this event was not handled before, and is not a SIGTRAP, we
2609 report it. SIGILL and SIGSEGV are also treated as traps in case
2610 a breakpoint is inserted at the current PC. If this target does
2611 not support internal breakpoints at all, we also report the
2612 SIGTRAP without further processing; it's of no concern to us. */
2614 = (supports_breakpoints ()
2615 && (WSTOPSIG (w
) == SIGTRAP
2616 || ((WSTOPSIG (w
) == SIGILL
2617 || WSTOPSIG (w
) == SIGSEGV
)
2618 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2620 if (maybe_internal_trap
)
2622 /* Handle anything that requires bookkeeping before deciding to
2623 report the event or continue waiting. */
2625 /* First check if we can explain the SIGTRAP with an internal
2626 breakpoint, or if we should possibly report the event to GDB.
2627 Do this before anything that may remove or insert a
2629 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2631 /* We have a SIGTRAP, possibly a step-over dance has just
2632 finished. If so, tweak the state machine accordingly,
2633 reinsert breakpoints and delete any reinsert (software
2634 single-step) breakpoints. */
2635 step_over_finished
= finish_step_over (event_child
);
2637 /* Now invoke the callbacks of any internal breakpoints there. */
2638 check_breakpoints (event_child
->stop_pc
);
2640 /* Handle tracepoint data collecting. This may overflow the
2641 trace buffer, and cause a tracing stop, removing
2643 trace_event
= handle_tracepoints (event_child
);
2645 if (bp_explains_trap
)
2647 /* If we stepped or ran into an internal breakpoint, we've
2648 already handled it. So next time we resume (from this
2649 PC), we should step over it. */
2651 debug_printf ("Hit a gdbserver breakpoint.\n");
2653 if (breakpoint_here (event_child
->stop_pc
))
2654 event_child
->need_step_over
= 1;
2659 /* We have some other signal, possibly a step-over dance was in
2660 progress, and it should be cancelled too. */
2661 step_over_finished
= finish_step_over (event_child
);
2664 /* We have all the data we need. Either report the event to GDB, or
2665 resume threads and keep waiting for more. */
2667 /* If we're collecting a fast tracepoint, finish the collection and
2668 move out of the jump pad before delivering a signal. See
2669 linux_stabilize_threads. */
2672 && WSTOPSIG (w
) != SIGTRAP
2673 && supports_fast_tracepoints ()
2674 && agent_loaded_p ())
2677 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2678 "to defer or adjust it.\n",
2679 WSTOPSIG (w
), lwpid_of (current_inferior
));
2681 /* Allow debugging the jump pad itself. */
2682 if (current_inferior
->last_resume_kind
!= resume_step
2683 && maybe_move_out_of_jump_pad (event_child
, &w
))
2685 enqueue_one_deferred_signal (event_child
, &w
);
2688 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2689 WSTOPSIG (w
), lwpid_of (current_inferior
));
2691 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2696 if (event_child
->collecting_fast_tracepoint
)
2699 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2700 "Check if we're already there.\n",
2701 lwpid_of (current_inferior
),
2702 event_child
->collecting_fast_tracepoint
);
2706 event_child
->collecting_fast_tracepoint
2707 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2709 if (event_child
->collecting_fast_tracepoint
!= 1)
2711 /* No longer need this breakpoint. */
2712 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2715 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2716 "stopping all threads momentarily.\n");
2718 /* Other running threads could hit this breakpoint.
2719 We don't handle moribund locations like GDB does,
2720 instead we always pause all threads when removing
2721 breakpoints, so that any step-over or
2722 decr_pc_after_break adjustment is always taken
2723 care of while the breakpoint is still
2725 stop_all_lwps (1, event_child
);
2726 cancel_breakpoints ();
2728 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2729 event_child
->exit_jump_pad_bkpt
= NULL
;
2731 unstop_all_lwps (1, event_child
);
2733 gdb_assert (event_child
->suspended
>= 0);
2737 if (event_child
->collecting_fast_tracepoint
== 0)
2740 debug_printf ("fast tracepoint finished "
2741 "collecting successfully.\n");
2743 /* We may have a deferred signal to report. */
2744 if (dequeue_one_deferred_signal (event_child
, &w
))
2747 debug_printf ("dequeued one signal.\n");
2752 debug_printf ("no deferred signals.\n");
2754 if (stabilizing_threads
)
2756 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2757 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2761 debug_printf ("linux_wait_1 ret = %s, stopped "
2762 "while stabilizing threads\n",
2763 target_pid_to_str (ptid_of (current_inferior
)));
2767 return ptid_of (current_inferior
);
2773 /* Check whether GDB would be interested in this event. */
2775 /* If GDB is not interested in this signal, don't stop other
2776 threads, and don't report it to GDB. Just resume the inferior
2777 right away. We do this for threading-related signals as well as
2778 any that GDB specifically requested we ignore. But never ignore
2779 SIGSTOP if we sent it ourselves, and do not ignore signals when
2780 stepping - they may require special handling to skip the signal
2782 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2785 && current_inferior
->last_resume_kind
!= resume_step
2787 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2788 (current_process ()->private->thread_db
!= NULL
2789 && (WSTOPSIG (w
) == __SIGRTMIN
2790 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2793 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2794 && !(WSTOPSIG (w
) == SIGSTOP
2795 && current_inferior
->last_resume_kind
== resume_stop
))))
2797 siginfo_t info
, *info_p
;
2800 debug_printf ("Ignored signal %d for LWP %ld.\n",
2801 WSTOPSIG (w
), lwpid_of (current_inferior
));
2803 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
2804 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2808 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2809 WSTOPSIG (w
), info_p
);
2813 /* Note that all addresses are always "out of the step range" when
2814 there's no range to begin with. */
2815 in_step_range
= lwp_in_step_range (event_child
);
2817 /* If GDB wanted this thread to single step, and the thread is out
2818 of the step range, we always want to report the SIGTRAP, and let
2819 GDB handle it. Watchpoints should always be reported. So should
2820 signals we can't explain. A SIGTRAP we can't explain could be a
2821 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2822 do, we're be able to handle GDB breakpoints on top of internal
2823 breakpoints, by handling the internal breakpoint and still
2824 reporting the event to GDB. If we don't, we're out of luck, GDB
2825 won't see the breakpoint hit. */
2826 report_to_gdb
= (!maybe_internal_trap
2827 || (current_inferior
->last_resume_kind
== resume_step
2829 || event_child
->stopped_by_watchpoint
2830 || (!step_over_finished
&& !in_step_range
2831 && !bp_explains_trap
&& !trace_event
)
2832 || (gdb_breakpoint_here (event_child
->stop_pc
)
2833 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2834 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2836 run_breakpoint_commands (event_child
->stop_pc
);
2838 /* We found no reason GDB would want us to stop. We either hit one
2839 of our own breakpoints, or finished an internal step GDB
2840 shouldn't know about. */
2845 if (bp_explains_trap
)
2846 debug_printf ("Hit a gdbserver breakpoint.\n");
2847 if (step_over_finished
)
2848 debug_printf ("Step-over finished.\n");
2850 debug_printf ("Tracepoint event.\n");
2851 if (lwp_in_step_range (event_child
))
2852 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2853 paddress (event_child
->stop_pc
),
2854 paddress (event_child
->step_range_start
),
2855 paddress (event_child
->step_range_end
));
2858 /* We're not reporting this breakpoint to GDB, so apply the
2859 decr_pc_after_break adjustment to the inferior's regcache
2862 if (the_low_target
.set_pc
!= NULL
)
2864 struct regcache
*regcache
2865 = get_thread_regcache (current_inferior
, 1);
2866 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2869 /* We may have finished stepping over a breakpoint. If so,
2870 we've stopped and suspended all LWPs momentarily except the
2871 stepping one. This is where we resume them all again. We're
2872 going to keep waiting, so use proceed, which handles stepping
2873 over the next breakpoint. */
2875 debug_printf ("proceeding all threads.\n");
2877 if (step_over_finished
)
2878 unsuspend_all_lwps (event_child
);
2880 proceed_all_lwps ();
2886 if (current_inferior
->last_resume_kind
== resume_step
)
2888 if (event_child
->step_range_start
== event_child
->step_range_end
)
2889 debug_printf ("GDB wanted to single-step, reporting event.\n");
2890 else if (!lwp_in_step_range (event_child
))
2891 debug_printf ("Out of step range, reporting event.\n");
2893 if (event_child
->stopped_by_watchpoint
)
2894 debug_printf ("Stopped by watchpoint.\n");
2895 if (gdb_breakpoint_here (event_child
->stop_pc
))
2896 debug_printf ("Stopped by GDB breakpoint.\n");
2898 debug_printf ("Hit a non-gdbserver trap event.\n");
2901 /* Alright, we're going to report a stop. */
2903 if (!non_stop
&& !stabilizing_threads
)
2905 /* In all-stop, stop all threads. */
2906 stop_all_lwps (0, NULL
);
2908 /* If we're not waiting for a specific LWP, choose an event LWP
2909 from among those that have had events. Giving equal priority
2910 to all LWPs that have had events helps prevent
2912 if (ptid_equal (ptid
, minus_one_ptid
))
2914 event_child
->status_pending_p
= 1;
2915 event_child
->status_pending
= w
;
2917 select_event_lwp (&event_child
);
2919 /* current_inferior and event_child must stay in sync. */
2920 current_inferior
= get_lwp_thread (event_child
);
2922 event_child
->status_pending_p
= 0;
2923 w
= event_child
->status_pending
;
2926 /* Now that we've selected our final event LWP, cancel any
2927 breakpoints in other LWPs that have hit a GDB breakpoint.
2928 See the comment in cancel_breakpoints_callback to find out
2930 find_inferior (&all_threads
, cancel_breakpoints_callback
, event_child
);
2932 /* If we were going a step-over, all other threads but the stepping one
2933 had been paused in start_step_over, with their suspend counts
2934 incremented. We don't want to do a full unstop/unpause, because we're
2935 in all-stop mode (so we want threads stopped), but we still need to
2936 unsuspend the other threads, to decrement their `suspended' count
2938 if (step_over_finished
)
2939 unsuspend_all_lwps (event_child
);
2941 /* Stabilize threads (move out of jump pads). */
2942 stabilize_threads ();
2946 /* If we just finished a step-over, then all threads had been
2947 momentarily paused. In all-stop, that's fine, we want
2948 threads stopped by now anyway. In non-stop, we need to
2949 re-resume threads that GDB wanted to be running. */
2950 if (step_over_finished
)
2951 unstop_all_lwps (1, event_child
);
2954 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2956 if (current_inferior
->last_resume_kind
== resume_stop
2957 && WSTOPSIG (w
) == SIGSTOP
)
2959 /* A thread that has been requested to stop by GDB with vCont;t,
2960 and it stopped cleanly, so report as SIG0. The use of
2961 SIGSTOP is an implementation detail. */
2962 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2964 else if (current_inferior
->last_resume_kind
== resume_stop
2965 && WSTOPSIG (w
) != SIGSTOP
)
2967 /* A thread that has been requested to stop by GDB with vCont;t,
2968 but, it stopped for other reasons. */
2969 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2973 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2976 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2980 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2981 target_pid_to_str (ptid_of (current_inferior
)),
2982 ourstatus
->kind
, ourstatus
->value
.sig
);
2986 return ptid_of (current_inferior
);
2989 /* Get rid of any pending event in the pipe. */
2991 async_file_flush (void)
2997 ret
= read (linux_event_pipe
[0], &buf
, 1);
2998 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3001 /* Put something in the pipe, so the event loop wakes up. */
3003 async_file_mark (void)
3007 async_file_flush ();
3010 ret
= write (linux_event_pipe
[1], "+", 1);
3011 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3013 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3014 be awakened anyway. */
3018 linux_wait (ptid_t ptid
,
3019 struct target_waitstatus
*ourstatus
, int target_options
)
3023 /* Flush the async file first. */
3024 if (target_is_async_p ())
3025 async_file_flush ();
3027 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3029 /* If at least one stop was reported, there may be more. A single
3030 SIGCHLD can signal more than one child stop. */
3031 if (target_is_async_p ()
3032 && (target_options
& TARGET_WNOHANG
) != 0
3033 && !ptid_equal (event_ptid
, null_ptid
))
3039 /* Send a signal to an LWP. */
3042 kill_lwp (unsigned long lwpid
, int signo
)
3044 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3045 fails, then we are not using nptl threads and we should be using kill. */
3049 static int tkill_failed
;
3056 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3057 if (errno
!= ENOSYS
)
3064 return kill (lwpid
, signo
);
3068 linux_stop_lwp (struct lwp_info
*lwp
)
3074 send_sigstop (struct lwp_info
*lwp
)
3078 pid
= lwpid_of (get_lwp_thread (lwp
));
3080 /* If we already have a pending stop signal for this process, don't
3082 if (lwp
->stop_expected
)
3085 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3091 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3093 lwp
->stop_expected
= 1;
3094 kill_lwp (pid
, SIGSTOP
);
3098 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3100 struct thread_info
*thread
= (struct thread_info
*) entry
;
3101 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3103 /* Ignore EXCEPT. */
3114 /* Increment the suspend count of an LWP, and stop it, if not stopped
3117 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3120 struct thread_info
*thread
= (struct thread_info
*) entry
;
3121 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3123 /* Ignore EXCEPT. */
3129 return send_sigstop_callback (entry
, except
);
3133 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3135 /* It's dead, really. */
3138 /* Store the exit status for later. */
3139 lwp
->status_pending_p
= 1;
3140 lwp
->status_pending
= wstat
;
3142 /* Prevent trying to stop it. */
3145 /* No further stops are expected from a dead lwp. */
3146 lwp
->stop_expected
= 0;
3149 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3152 wait_for_sigstop (void)
3154 struct thread_info
*saved_inferior
;
3159 saved_inferior
= current_inferior
;
3160 if (saved_inferior
!= NULL
)
3161 saved_tid
= saved_inferior
->entry
.id
;
3163 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3166 debug_printf ("wait_for_sigstop: pulling events\n");
3168 /* Passing NULL_PTID as filter indicates we want all events to be
3169 left pending. Eventually this returns when there are no
3170 unwaited-for children left. */
3171 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3173 gdb_assert (ret
== -1);
3175 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3176 current_inferior
= saved_inferior
;
3180 debug_printf ("Previously current thread died.\n");
3184 /* We can't change the current inferior behind GDB's back,
3185 otherwise, a subsequent command may apply to the wrong
3187 current_inferior
= NULL
;
3191 /* Set a valid thread as current. */
3192 set_desired_inferior (0);
3197 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3198 move it out, because we need to report the stop event to GDB. For
3199 example, if the user puts a breakpoint in the jump pad, it's
3200 because she wants to debug it. */
3203 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3205 struct thread_info
*thread
= (struct thread_info
*) entry
;
3206 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3208 gdb_assert (lwp
->suspended
== 0);
3209 gdb_assert (lwp
->stopped
);
3211 /* Allow debugging the jump pad, gdb_collect, etc.. */
3212 return (supports_fast_tracepoints ()
3213 && agent_loaded_p ()
3214 && (gdb_breakpoint_here (lwp
->stop_pc
)
3215 || lwp
->stopped_by_watchpoint
3216 || thread
->last_resume_kind
== resume_step
)
3217 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3221 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3223 struct thread_info
*thread
= (struct thread_info
*) entry
;
3224 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3227 gdb_assert (lwp
->suspended
== 0);
3228 gdb_assert (lwp
->stopped
);
3230 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3232 /* Allow debugging the jump pad, gdb_collect, etc. */
3233 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3234 && !lwp
->stopped_by_watchpoint
3235 && thread
->last_resume_kind
!= resume_step
3236 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3239 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3244 lwp
->status_pending_p
= 0;
3245 enqueue_one_deferred_signal (lwp
, wstat
);
3248 debug_printf ("Signal %d for LWP %ld deferred "
3250 WSTOPSIG (*wstat
), lwpid_of (thread
));
3253 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3260 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3262 struct thread_info
*thread
= (struct thread_info
*) entry
;
3263 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3272 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3273 If SUSPEND, then also increase the suspend count of every LWP,
3277 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3279 /* Should not be called recursively. */
3280 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3285 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3286 suspend
? "stop-and-suspend" : "stop",
3288 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3292 stopping_threads
= (suspend
3293 ? STOPPING_AND_SUSPENDING_THREADS
3294 : STOPPING_THREADS
);
3297 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3299 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3300 wait_for_sigstop ();
3301 stopping_threads
= NOT_STOPPING_THREADS
;
3305 debug_printf ("stop_all_lwps done, setting stopping_threads "
3306 "back to !stopping\n");
3311 /* Resume execution of the inferior process.
3312 If STEP is nonzero, single-step it.
3313 If SIGNAL is nonzero, give it that signal. */
3316 linux_resume_one_lwp (struct lwp_info
*lwp
,
3317 int step
, int signal
, siginfo_t
*info
)
3319 struct thread_info
*thread
= get_lwp_thread (lwp
);
3320 struct thread_info
*saved_inferior
;
3321 int fast_tp_collecting
;
3323 if (lwp
->stopped
== 0)
3326 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3328 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3330 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3331 user used the "jump" command, or "set $pc = foo"). */
3332 if (lwp
->stop_pc
!= get_pc (lwp
))
3334 /* Collecting 'while-stepping' actions doesn't make sense
3336 release_while_stepping_state_list (thread
);
3339 /* If we have pending signals or status, and a new signal, enqueue the
3340 signal. Also enqueue the signal if we are waiting to reinsert a
3341 breakpoint; it will be picked up again below. */
3343 && (lwp
->status_pending_p
3344 || lwp
->pending_signals
!= NULL
3345 || lwp
->bp_reinsert
!= 0
3346 || fast_tp_collecting
))
3348 struct pending_signals
*p_sig
;
3349 p_sig
= xmalloc (sizeof (*p_sig
));
3350 p_sig
->prev
= lwp
->pending_signals
;
3351 p_sig
->signal
= signal
;
3353 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3355 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3356 lwp
->pending_signals
= p_sig
;
3359 if (lwp
->status_pending_p
)
3362 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3363 " has pending status\n",
3364 lwpid_of (thread
), step
? "step" : "continue", signal
,
3365 lwp
->stop_expected
? "expected" : "not expected");
3369 saved_inferior
= current_inferior
;
3370 current_inferior
= thread
;
3373 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3374 lwpid_of (thread
), step
? "step" : "continue", signal
,
3375 lwp
->stop_expected
? "expected" : "not expected");
3377 /* This bit needs some thinking about. If we get a signal that
3378 we must report while a single-step reinsert is still pending,
3379 we often end up resuming the thread. It might be better to
3380 (ew) allow a stack of pending events; then we could be sure that
3381 the reinsert happened right away and not lose any signals.
3383 Making this stack would also shrink the window in which breakpoints are
3384 uninserted (see comment in linux_wait_for_lwp) but not enough for
3385 complete correctness, so it won't solve that problem. It may be
3386 worthwhile just to solve this one, however. */
3387 if (lwp
->bp_reinsert
!= 0)
3390 debug_printf (" pending reinsert at 0x%s\n",
3391 paddress (lwp
->bp_reinsert
));
3393 if (can_hardware_single_step ())
3395 if (fast_tp_collecting
== 0)
3398 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3400 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3407 /* Postpone any pending signal. It was enqueued above. */
3411 if (fast_tp_collecting
== 1)
3414 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3415 " (exit-jump-pad-bkpt)\n",
3418 /* Postpone any pending signal. It was enqueued above. */
3421 else if (fast_tp_collecting
== 2)
3424 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3425 " single-stepping\n",
3428 if (can_hardware_single_step ())
3431 fatal ("moving out of jump pad single-stepping"
3432 " not implemented on this target");
3434 /* Postpone any pending signal. It was enqueued above. */
3438 /* If we have while-stepping actions in this thread set it stepping.
3439 If we have a signal to deliver, it may or may not be set to
3440 SIG_IGN, we don't know. Assume so, and allow collecting
3441 while-stepping into a signal handler. A possible smart thing to
3442 do would be to set an internal breakpoint at the signal return
3443 address, continue, and carry on catching this while-stepping
3444 action only when that breakpoint is hit. A future
3446 if (thread
->while_stepping
!= NULL
3447 && can_hardware_single_step ())
3450 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3455 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3457 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3458 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3459 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3462 /* If we have pending signals, consume one unless we are trying to
3463 reinsert a breakpoint or we're trying to finish a fast tracepoint
3465 if (lwp
->pending_signals
!= NULL
3466 && lwp
->bp_reinsert
== 0
3467 && fast_tp_collecting
== 0)
3469 struct pending_signals
**p_sig
;
3471 p_sig
= &lwp
->pending_signals
;
3472 while ((*p_sig
)->prev
!= NULL
)
3473 p_sig
= &(*p_sig
)->prev
;
3475 signal
= (*p_sig
)->signal
;
3476 if ((*p_sig
)->info
.si_signo
!= 0)
3477 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3484 if (the_low_target
.prepare_to_resume
!= NULL
)
3485 the_low_target
.prepare_to_resume (lwp
);
3487 regcache_invalidate_thread (thread
);
3490 lwp
->stopped_by_watchpoint
= 0;
3491 lwp
->stepping
= step
;
3492 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3493 (PTRACE_TYPE_ARG3
) 0,
3494 /* Coerce to a uintptr_t first to avoid potential gcc warning
3495 of coercing an 8 byte integer to a 4 byte pointer. */
3496 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3498 current_inferior
= saved_inferior
;
3501 /* ESRCH from ptrace either means that the thread was already
3502 running (an error) or that it is gone (a race condition). If
3503 it's gone, we will get a notification the next time we wait,
3504 so we can ignore the error. We could differentiate these
3505 two, but it's tricky without waiting; the thread still exists
3506 as a zombie, so sending it signal 0 would succeed. So just
3511 perror_with_name ("ptrace");
3515 struct thread_resume_array
3517 struct thread_resume
*resume
;
3521 /* This function is called once per thread via find_inferior.
3522 ARG is a pointer to a thread_resume_array struct.
3523 We look up the thread specified by ENTRY in ARG, and mark the thread
3524 with a pointer to the appropriate resume request.
3526 This algorithm is O(threads * resume elements), but resume elements
3527 is small (and will remain small at least until GDB supports thread
3531 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3533 struct thread_info
*thread
= (struct thread_info
*) entry
;
3534 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3536 struct thread_resume_array
*r
;
3540 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3542 ptid_t ptid
= r
->resume
[ndx
].thread
;
3543 if (ptid_equal (ptid
, minus_one_ptid
)
3544 || ptid_equal (ptid
, entry
->id
)
3545 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3547 || (ptid_get_pid (ptid
) == pid_of (thread
)
3548 && (ptid_is_pid (ptid
)
3549 || ptid_get_lwp (ptid
) == -1)))
3551 if (r
->resume
[ndx
].kind
== resume_stop
3552 && thread
->last_resume_kind
== resume_stop
)
3555 debug_printf ("already %s LWP %ld at GDB's request\n",
3556 (thread
->last_status
.kind
3557 == TARGET_WAITKIND_STOPPED
)
3565 lwp
->resume
= &r
->resume
[ndx
];
3566 thread
->last_resume_kind
= lwp
->resume
->kind
;
3568 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3569 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3571 /* If we had a deferred signal to report, dequeue one now.
3572 This can happen if LWP gets more than one signal while
3573 trying to get out of a jump pad. */
3575 && !lwp
->status_pending_p
3576 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3578 lwp
->status_pending_p
= 1;
3581 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3582 "leaving status pending.\n",
3583 WSTOPSIG (lwp
->status_pending
),
3591 /* No resume action for this thread. */
3597 /* find_inferior callback for linux_resume.
3598 Set *FLAG_P if this lwp has an interesting status pending. */
3601 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3603 struct thread_info
*thread
= (struct thread_info
*) entry
;
3604 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3606 /* LWPs which will not be resumed are not interesting, because
3607 we might not wait for them next time through linux_wait. */
3608 if (lwp
->resume
== NULL
)
3611 if (lwp
->status_pending_p
)
3612 * (int *) flag_p
= 1;
3617 /* Return 1 if this lwp that GDB wants running is stopped at an
3618 internal breakpoint that we need to step over. It assumes that any
3619 required STOP_PC adjustment has already been propagated to the
3620 inferior's regcache. */
3623 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3625 struct thread_info
*thread
= (struct thread_info
*) entry
;
3626 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3627 struct thread_info
*saved_inferior
;
3630 /* LWPs which will not be resumed are not interesting, because we
3631 might not wait for them next time through linux_wait. */
3636 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3641 if (thread
->last_resume_kind
== resume_stop
)
3644 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3650 gdb_assert (lwp
->suspended
>= 0);
3655 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3660 if (!lwp
->need_step_over
)
3663 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3666 if (lwp
->status_pending_p
)
3669 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3675 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3679 /* If the PC has changed since we stopped, then don't do anything,
3680 and let the breakpoint/tracepoint be hit. This happens if, for
3681 instance, GDB handled the decr_pc_after_break subtraction itself,
3682 GDB is OOL stepping this thread, or the user has issued a "jump"
3683 command, or poked thread's registers herself. */
3684 if (pc
!= lwp
->stop_pc
)
3687 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3688 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3690 paddress (lwp
->stop_pc
), paddress (pc
));
3692 lwp
->need_step_over
= 0;
3696 saved_inferior
= current_inferior
;
3697 current_inferior
= thread
;
3699 /* We can only step over breakpoints we know about. */
3700 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3702 /* Don't step over a breakpoint that GDB expects to hit
3703 though. If the condition is being evaluated on the target's side
3704 and it evaluate to false, step over this breakpoint as well. */
3705 if (gdb_breakpoint_here (pc
)
3706 && gdb_condition_true_at_breakpoint (pc
)
3707 && gdb_no_commands_at_breakpoint (pc
))
3710 debug_printf ("Need step over [LWP %ld]? yes, but found"
3711 " GDB breakpoint at 0x%s; skipping step over\n",
3712 lwpid_of (thread
), paddress (pc
));
3714 current_inferior
= saved_inferior
;
3720 debug_printf ("Need step over [LWP %ld]? yes, "
3721 "found breakpoint at 0x%s\n",
3722 lwpid_of (thread
), paddress (pc
));
3724 /* We've found an lwp that needs stepping over --- return 1 so
3725 that find_inferior stops looking. */
3726 current_inferior
= saved_inferior
;
3728 /* If the step over is cancelled, this is set again. */
3729 lwp
->need_step_over
= 0;
3734 current_inferior
= saved_inferior
;
3737 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3739 lwpid_of (thread
), paddress (pc
));
3744 /* Start a step-over operation on LWP. When LWP stopped at a
3745 breakpoint, to make progress, we need to remove the breakpoint out
3746 of the way. If we let other threads run while we do that, they may
3747 pass by the breakpoint location and miss hitting it. To avoid
3748 that, a step-over momentarily stops all threads while LWP is
3749 single-stepped while the breakpoint is temporarily uninserted from
3750 the inferior. When the single-step finishes, we reinsert the
3751 breakpoint, and let all threads that are supposed to be running,
3754 On targets that don't support hardware single-step, we don't
3755 currently support full software single-stepping. Instead, we only
3756 support stepping over the thread event breakpoint, by asking the
3757 low target where to place a reinsert breakpoint. Since this
3758 routine assumes the breakpoint being stepped over is a thread event
3759 breakpoint, it usually assumes the return address of the current
3760 function is a good enough place to set the reinsert breakpoint. */
3763 start_step_over (struct lwp_info
*lwp
)
3765 struct thread_info
*thread
= get_lwp_thread (lwp
);
3766 struct thread_info
*saved_inferior
;
3771 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3774 stop_all_lwps (1, lwp
);
3775 gdb_assert (lwp
->suspended
== 0);
3778 debug_printf ("Done stopping all threads for step-over.\n");
3780 /* Note, we should always reach here with an already adjusted PC,
3781 either by GDB (if we're resuming due to GDB's request), or by our
3782 caller, if we just finished handling an internal breakpoint GDB
3783 shouldn't care about. */
3786 saved_inferior
= current_inferior
;
3787 current_inferior
= thread
;
3789 lwp
->bp_reinsert
= pc
;
3790 uninsert_breakpoints_at (pc
);
3791 uninsert_fast_tracepoint_jumps_at (pc
);
3793 if (can_hardware_single_step ())
3799 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3800 set_reinsert_breakpoint (raddr
);
3804 current_inferior
= saved_inferior
;
3806 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3808 /* Require next event from this LWP. */
3809 step_over_bkpt
= thread
->entry
.id
;
3813 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3814 start_step_over, if still there, and delete any reinsert
3815 breakpoints we've set, on non hardware single-step targets. */
3818 finish_step_over (struct lwp_info
*lwp
)
3820 if (lwp
->bp_reinsert
!= 0)
3823 debug_printf ("Finished step over.\n");
3825 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3826 may be no breakpoint to reinsert there by now. */
3827 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3828 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3830 lwp
->bp_reinsert
= 0;
3832 /* Delete any software-single-step reinsert breakpoints. No
3833 longer needed. We don't have to worry about other threads
3834 hitting this trap, and later not being able to explain it,
3835 because we were stepping over a breakpoint, and we hold all
3836 threads but LWP stopped while doing that. */
3837 if (!can_hardware_single_step ())
3838 delete_reinsert_breakpoints ();
3840 step_over_bkpt
= null_ptid
;
3847 /* This function is called once per thread. We check the thread's resume
3848 request, which will tell us whether to resume, step, or leave the thread
3849 stopped; and what signal, if any, it should be sent.
3851 For threads which we aren't explicitly told otherwise, we preserve
3852 the stepping flag; this is used for stepping over gdbserver-placed
3855 If pending_flags was set in any thread, we queue any needed
3856 signals, since we won't actually resume. We already have a pending
3857 event to report, so we don't need to preserve any step requests;
3858 they should be re-issued if necessary. */
3861 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3863 struct thread_info
*thread
= (struct thread_info
*) entry
;
3864 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3866 int leave_all_stopped
= * (int *) arg
;
3869 if (lwp
->resume
== NULL
)
3872 if (lwp
->resume
->kind
== resume_stop
)
3875 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3880 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3882 /* Stop the thread, and wait for the event asynchronously,
3883 through the event loop. */
3889 debug_printf ("already stopped LWP %ld\n",
3892 /* The LWP may have been stopped in an internal event that
3893 was not meant to be notified back to GDB (e.g., gdbserver
3894 breakpoint), so we should be reporting a stop event in
3897 /* If the thread already has a pending SIGSTOP, this is a
3898 no-op. Otherwise, something later will presumably resume
3899 the thread and this will cause it to cancel any pending
3900 operation, due to last_resume_kind == resume_stop. If
3901 the thread already has a pending status to report, we
3902 will still report it the next time we wait - see
3903 status_pending_p_callback. */
3905 /* If we already have a pending signal to report, then
3906 there's no need to queue a SIGSTOP, as this means we're
3907 midway through moving the LWP out of the jumppad, and we
3908 will report the pending signal as soon as that is
3910 if (lwp
->pending_signals_to_report
== NULL
)
3914 /* For stop requests, we're done. */
3916 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3920 /* If this thread which is about to be resumed has a pending status,
3921 then don't resume any threads - we can just report the pending
3922 status. Make sure to queue any signals that would otherwise be
3923 sent. In all-stop mode, we do this decision based on if *any*
3924 thread has a pending status. If there's a thread that needs the
3925 step-over-breakpoint dance, then don't resume any other thread
3926 but that particular one. */
3927 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3932 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3934 step
= (lwp
->resume
->kind
== resume_step
);
3935 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3940 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3942 /* If we have a new signal, enqueue the signal. */
3943 if (lwp
->resume
->sig
!= 0)
3945 struct pending_signals
*p_sig
;
3946 p_sig
= xmalloc (sizeof (*p_sig
));
3947 p_sig
->prev
= lwp
->pending_signals
;
3948 p_sig
->signal
= lwp
->resume
->sig
;
3949 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3951 /* If this is the same signal we were previously stopped by,
3952 make sure to queue its siginfo. We can ignore the return
3953 value of ptrace; if it fails, we'll skip
3954 PTRACE_SETSIGINFO. */
3955 if (WIFSTOPPED (lwp
->last_status
)
3956 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3957 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3960 lwp
->pending_signals
= p_sig
;
3964 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3970 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3972 struct thread_resume_array array
= { resume_info
, n
};
3973 struct thread_info
*need_step_over
= NULL
;
3975 int leave_all_stopped
;
3980 debug_printf ("linux_resume:\n");
3983 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3985 /* If there is a thread which would otherwise be resumed, which has
3986 a pending status, then don't resume any threads - we can just
3987 report the pending status. Make sure to queue any signals that
3988 would otherwise be sent. In non-stop mode, we'll apply this
3989 logic to each thread individually. We consume all pending events
3990 before considering to start a step-over (in all-stop). */
3993 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3995 /* If there is a thread which would otherwise be resumed, which is
3996 stopped at a breakpoint that needs stepping over, then don't
3997 resume any threads - have it step over the breakpoint with all
3998 other threads stopped, then resume all threads again. Make sure
3999 to queue any signals that would otherwise be delivered or
4001 if (!any_pending
&& supports_breakpoints ())
4003 = (struct thread_info
*) find_inferior (&all_threads
,
4004 need_step_over_p
, NULL
);
4006 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4010 if (need_step_over
!= NULL
)
4011 debug_printf ("Not resuming all, need step over\n");
4012 else if (any_pending
)
4013 debug_printf ("Not resuming, all-stop and found "
4014 "an LWP with pending status\n");
4016 debug_printf ("Resuming, no pending status or step over needed\n");
4019 /* Even if we're leaving threads stopped, queue all signals we'd
4020 otherwise deliver. */
4021 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4024 start_step_over (get_thread_lwp (need_step_over
));
4028 debug_printf ("linux_resume done\n");
4033 /* This function is called once per thread. We check the thread's
4034 last resume request, which will tell us whether to resume, step, or
4035 leave the thread stopped. Any signal the client requested to be
4036 delivered has already been enqueued at this point.
4038 If any thread that GDB wants running is stopped at an internal
4039 breakpoint that needs stepping over, we start a step-over operation
4040 on that particular thread, and leave all others stopped. */
4043 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4045 struct thread_info
*thread
= (struct thread_info
*) entry
;
4046 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4053 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4058 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4062 if (thread
->last_resume_kind
== resume_stop
4063 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4066 debug_printf (" client wants LWP to remain %ld stopped\n",
4071 if (lwp
->status_pending_p
)
4074 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4079 gdb_assert (lwp
->suspended
>= 0);
4084 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4088 if (thread
->last_resume_kind
== resume_stop
4089 && lwp
->pending_signals_to_report
== NULL
4090 && lwp
->collecting_fast_tracepoint
== 0)
4092 /* We haven't reported this LWP as stopped yet (otherwise, the
4093 last_status.kind check above would catch it, and we wouldn't
4094 reach here. This LWP may have been momentarily paused by a
4095 stop_all_lwps call while handling for example, another LWP's
4096 step-over. In that case, the pending expected SIGSTOP signal
4097 that was queued at vCont;t handling time will have already
4098 been consumed by wait_for_sigstop, and so we need to requeue
4099 another one here. Note that if the LWP already has a SIGSTOP
4100 pending, this is a no-op. */
4103 debug_printf ("Client wants LWP %ld to stop. "
4104 "Making sure it has a SIGSTOP pending\n",
4110 step
= thread
->last_resume_kind
== resume_step
;
4111 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4116 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4118 struct thread_info
*thread
= (struct thread_info
*) entry
;
4119 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4125 gdb_assert (lwp
->suspended
>= 0);
4127 return proceed_one_lwp (entry
, except
);
4130 /* When we finish a step-over, set threads running again. If there's
4131 another thread that may need a step-over, now's the time to start
4132 it. Eventually, we'll move all threads past their breakpoints. */
4135 proceed_all_lwps (void)
4137 struct thread_info
*need_step_over
;
4139 /* If there is a thread which would otherwise be resumed, which is
4140 stopped at a breakpoint that needs stepping over, then don't
4141 resume any threads - have it step over the breakpoint with all
4142 other threads stopped, then resume all threads again. */
4144 if (supports_breakpoints ())
4147 = (struct thread_info
*) find_inferior (&all_threads
,
4148 need_step_over_p
, NULL
);
4150 if (need_step_over
!= NULL
)
4153 debug_printf ("proceed_all_lwps: found "
4154 "thread %ld needing a step-over\n",
4155 lwpid_of (need_step_over
));
4157 start_step_over (get_thread_lwp (need_step_over
));
4163 debug_printf ("Proceeding, no step-over needed\n");
4165 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4168 /* Stopped LWPs that the client wanted to be running, that don't have
4169 pending statuses, are set to run again, except for EXCEPT, if not
4170 NULL. This undoes a stop_all_lwps call. */
4173 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4179 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4180 lwpid_of (get_lwp_thread (except
)));
4182 debug_printf ("unstopping all lwps\n");
4186 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4188 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4192 debug_printf ("unstop_all_lwps done\n");
4198 #ifdef HAVE_LINUX_REGSETS
4200 #define use_linux_regsets 1
4202 /* Returns true if REGSET has been disabled. */
4205 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4207 return (info
->disabled_regsets
!= NULL
4208 && info
->disabled_regsets
[regset
- info
->regsets
]);
4211 /* Disable REGSET. */
4214 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4218 dr_offset
= regset
- info
->regsets
;
4219 if (info
->disabled_regsets
== NULL
)
4220 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4221 info
->disabled_regsets
[dr_offset
] = 1;
4225 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4226 struct regcache
*regcache
)
4228 struct regset_info
*regset
;
4229 int saw_general_regs
= 0;
4233 regset
= regsets_info
->regsets
;
4235 pid
= lwpid_of (current_inferior
);
4236 while (regset
->size
>= 0)
4241 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4247 buf
= xmalloc (regset
->size
);
4249 nt_type
= regset
->nt_type
;
4253 iov
.iov_len
= regset
->size
;
4254 data
= (void *) &iov
;
4260 res
= ptrace (regset
->get_request
, pid
,
4261 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4263 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4269 /* If we get EIO on a regset, do not try it again for
4270 this process mode. */
4271 disable_regset (regsets_info
, regset
);
4278 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4283 else if (regset
->type
== GENERAL_REGS
)
4284 saw_general_regs
= 1;
4285 regset
->store_function (regcache
, buf
);
4289 if (saw_general_regs
)
4296 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4297 struct regcache
*regcache
)
4299 struct regset_info
*regset
;
4300 int saw_general_regs
= 0;
4304 regset
= regsets_info
->regsets
;
4306 pid
= lwpid_of (current_inferior
);
4307 while (regset
->size
>= 0)
4312 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4318 buf
= xmalloc (regset
->size
);
4320 /* First fill the buffer with the current register set contents,
4321 in case there are any items in the kernel's regset that are
4322 not in gdbserver's regcache. */
4324 nt_type
= regset
->nt_type
;
4328 iov
.iov_len
= regset
->size
;
4329 data
= (void *) &iov
;
4335 res
= ptrace (regset
->get_request
, pid
,
4336 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4338 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4343 /* Then overlay our cached registers on that. */
4344 regset
->fill_function (regcache
, buf
);
4346 /* Only now do we write the register set. */
4348 res
= ptrace (regset
->set_request
, pid
,
4349 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4351 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4359 /* If we get EIO on a regset, do not try it again for
4360 this process mode. */
4361 disable_regset (regsets_info
, regset
);
4365 else if (errno
== ESRCH
)
4367 /* At this point, ESRCH should mean the process is
4368 already gone, in which case we simply ignore attempts
4369 to change its registers. See also the related
4370 comment in linux_resume_one_lwp. */
4376 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4379 else if (regset
->type
== GENERAL_REGS
)
4380 saw_general_regs
= 1;
4384 if (saw_general_regs
)
4390 #else /* !HAVE_LINUX_REGSETS */
4392 #define use_linux_regsets 0
4393 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4394 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4398 /* Return 1 if register REGNO is supported by one of the regset ptrace
4399 calls or 0 if it has to be transferred individually. */
4402 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4404 unsigned char mask
= 1 << (regno
% 8);
4405 size_t index
= regno
/ 8;
4407 return (use_linux_regsets
4408 && (regs_info
->regset_bitmap
== NULL
4409 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4412 #ifdef HAVE_LINUX_USRREGS
4415 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4419 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4420 error ("Invalid register number %d.", regnum
);
4422 addr
= usrregs
->regmap
[regnum
];
4427 /* Fetch one register. */
4429 fetch_register (const struct usrregs_info
*usrregs
,
4430 struct regcache
*regcache
, int regno
)
4437 if (regno
>= usrregs
->num_regs
)
4439 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4442 regaddr
= register_addr (usrregs
, regno
);
4446 size
= ((register_size (regcache
->tdesc
, regno
)
4447 + sizeof (PTRACE_XFER_TYPE
) - 1)
4448 & -sizeof (PTRACE_XFER_TYPE
));
4449 buf
= alloca (size
);
4451 pid
= lwpid_of (current_inferior
);
4452 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4455 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4456 ptrace (PTRACE_PEEKUSER
, pid
,
4457 /* Coerce to a uintptr_t first to avoid potential gcc warning
4458 of coercing an 8 byte integer to a 4 byte pointer. */
4459 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4460 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4462 error ("reading register %d: %s", regno
, strerror (errno
));
4465 if (the_low_target
.supply_ptrace_register
)
4466 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4468 supply_register (regcache
, regno
, buf
);
4471 /* Store one register. */
4473 store_register (const struct usrregs_info
*usrregs
,
4474 struct regcache
*regcache
, int regno
)
4481 if (regno
>= usrregs
->num_regs
)
4483 if ((*the_low_target
.cannot_store_register
) (regno
))
4486 regaddr
= register_addr (usrregs
, regno
);
4490 size
= ((register_size (regcache
->tdesc
, regno
)
4491 + sizeof (PTRACE_XFER_TYPE
) - 1)
4492 & -sizeof (PTRACE_XFER_TYPE
));
4493 buf
= alloca (size
);
4494 memset (buf
, 0, size
);
4496 if (the_low_target
.collect_ptrace_register
)
4497 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4499 collect_register (regcache
, regno
, buf
);
4501 pid
= lwpid_of (current_inferior
);
4502 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4505 ptrace (PTRACE_POKEUSER
, pid
,
4506 /* Coerce to a uintptr_t first to avoid potential gcc warning
4507 about coercing an 8 byte integer to a 4 byte pointer. */
4508 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4509 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4512 /* At this point, ESRCH should mean the process is
4513 already gone, in which case we simply ignore attempts
4514 to change its registers. See also the related
4515 comment in linux_resume_one_lwp. */
4519 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4520 error ("writing register %d: %s", regno
, strerror (errno
));
4522 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4526 /* Fetch all registers, or just one, from the child process.
4527 If REGNO is -1, do this for all registers, skipping any that are
4528 assumed to have been retrieved by regsets_fetch_inferior_registers,
4529 unless ALL is non-zero.
4530 Otherwise, REGNO specifies which register (so we can save time). */
4532 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4533 struct regcache
*regcache
, int regno
, int all
)
4535 struct usrregs_info
*usr
= regs_info
->usrregs
;
4539 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4540 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4541 fetch_register (usr
, regcache
, regno
);
4544 fetch_register (usr
, regcache
, regno
);
4547 /* Store our register values back into the inferior.
4548 If REGNO is -1, do this for all registers, skipping any that are
4549 assumed to have been saved by regsets_store_inferior_registers,
4550 unless ALL is non-zero.
4551 Otherwise, REGNO specifies which register (so we can save time). */
4553 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4554 struct regcache
*regcache
, int regno
, int all
)
4556 struct usrregs_info
*usr
= regs_info
->usrregs
;
4560 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4561 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4562 store_register (usr
, regcache
, regno
);
4565 store_register (usr
, regcache
, regno
);
4568 #else /* !HAVE_LINUX_USRREGS */
4570 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4571 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4577 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4581 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4585 if (the_low_target
.fetch_register
!= NULL
4586 && regs_info
->usrregs
!= NULL
)
4587 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4588 (*the_low_target
.fetch_register
) (regcache
, regno
);
4590 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4591 if (regs_info
->usrregs
!= NULL
)
4592 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4596 if (the_low_target
.fetch_register
!= NULL
4597 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4600 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4602 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4604 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4605 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4610 linux_store_registers (struct regcache
*regcache
, int regno
)
4614 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4618 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4620 if (regs_info
->usrregs
!= NULL
)
4621 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4625 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4627 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4629 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4630 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4635 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4636 to debugger memory starting at MYADDR. */
4639 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4641 int pid
= lwpid_of (current_inferior
);
4642 register PTRACE_XFER_TYPE
*buffer
;
4643 register CORE_ADDR addr
;
4650 /* Try using /proc. Don't bother for one word. */
4651 if (len
>= 3 * sizeof (long))
4655 /* We could keep this file open and cache it - possibly one per
4656 thread. That requires some juggling, but is even faster. */
4657 sprintf (filename
, "/proc/%d/mem", pid
);
4658 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4662 /* If pread64 is available, use it. It's faster if the kernel
4663 supports it (only one syscall), and it's 64-bit safe even on
4664 32-bit platforms (for instance, SPARC debugging a SPARC64
4667 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4670 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4671 bytes
= read (fd
, myaddr
, len
);
4678 /* Some data was read, we'll try to get the rest with ptrace. */
4688 /* Round starting address down to longword boundary. */
4689 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4690 /* Round ending address up; get number of longwords that makes. */
4691 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4692 / sizeof (PTRACE_XFER_TYPE
));
4693 /* Allocate buffer of that many longwords. */
4694 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4696 /* Read all the longwords */
4698 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4700 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4701 about coercing an 8 byte integer to a 4 byte pointer. */
4702 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4703 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4704 (PTRACE_TYPE_ARG4
) 0);
4710 /* Copy appropriate bytes out of the buffer. */
4713 i
*= sizeof (PTRACE_XFER_TYPE
);
4714 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4716 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4723 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4724 memory at MEMADDR. On failure (cannot write to the inferior)
4725 returns the value of errno. Always succeeds if LEN is zero. */
4728 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4731 /* Round starting address down to longword boundary. */
4732 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4733 /* Round ending address up; get number of longwords that makes. */
4735 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4736 / sizeof (PTRACE_XFER_TYPE
);
4738 /* Allocate buffer of that many longwords. */
4739 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4740 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4742 int pid
= lwpid_of (current_inferior
);
4746 /* Zero length write always succeeds. */
4752 /* Dump up to four bytes. */
4753 unsigned int val
= * (unsigned int *) myaddr
;
4759 val
= val
& 0xffffff;
4760 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4761 val
, (long)memaddr
);
4764 /* Fill start and end extra bytes of buffer with existing memory data. */
4767 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4768 about coercing an 8 byte integer to a 4 byte pointer. */
4769 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4770 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4771 (PTRACE_TYPE_ARG4
) 0);
4779 = ptrace (PTRACE_PEEKTEXT
, pid
,
4780 /* Coerce to a uintptr_t first to avoid potential gcc warning
4781 about coercing an 8 byte integer to a 4 byte pointer. */
4782 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4783 * sizeof (PTRACE_XFER_TYPE
)),
4784 (PTRACE_TYPE_ARG4
) 0);
4789 /* Copy data to be written over corresponding part of buffer. */
4791 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4794 /* Write the entire buffer. */
4796 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4799 ptrace (PTRACE_POKETEXT
, pid
,
4800 /* Coerce to a uintptr_t first to avoid potential gcc warning
4801 about coercing an 8 byte integer to a 4 byte pointer. */
4802 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4803 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4812 linux_look_up_symbols (void)
4814 #ifdef USE_THREAD_DB
4815 struct process_info
*proc
= current_process ();
4817 if (proc
->private->thread_db
!= NULL
)
4820 /* If the kernel supports tracing clones, then we don't need to
4821 use the magic thread event breakpoint to learn about
4823 thread_db_init (!linux_supports_traceclone ());
4828 linux_request_interrupt (void)
4830 extern unsigned long signal_pid
;
4832 if (!ptid_equal (cont_thread
, null_ptid
)
4833 && !ptid_equal (cont_thread
, minus_one_ptid
))
4837 lwpid
= lwpid_of (current_inferior
);
4838 kill_lwp (lwpid
, SIGINT
);
4841 kill_lwp (signal_pid
, SIGINT
);
4844 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4845 to debugger memory starting at MYADDR. */
4848 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4850 char filename
[PATH_MAX
];
4852 int pid
= lwpid_of (current_inferior
);
4854 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4856 fd
= open (filename
, O_RDONLY
);
4860 if (offset
!= (CORE_ADDR
) 0
4861 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4864 n
= read (fd
, myaddr
, len
);
4871 /* These breakpoint and watchpoint related wrapper functions simply
4872 pass on the function call if the target has registered a
4873 corresponding function. */
4876 linux_supports_z_point_type (char z_type
)
4878 return (the_low_target
.supports_z_point_type
!= NULL
4879 && the_low_target
.supports_z_point_type (z_type
));
4883 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4884 int size
, struct raw_breakpoint
*bp
)
4886 if (the_low_target
.insert_point
!= NULL
)
4887 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4889 /* Unsupported (see target.h). */
4894 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4895 int size
, struct raw_breakpoint
*bp
)
4897 if (the_low_target
.remove_point
!= NULL
)
4898 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4900 /* Unsupported (see target.h). */
4905 linux_stopped_by_watchpoint (void)
4907 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4909 return lwp
->stopped_by_watchpoint
;
4913 linux_stopped_data_address (void)
4915 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4917 return lwp
->stopped_data_address
;
4920 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4921 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4922 && defined(PT_TEXT_END_ADDR)
4924 /* This is only used for targets that define PT_TEXT_ADDR,
4925 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4926 the target has different ways of acquiring this information, like
4929 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4930 to tell gdb about. */
4933 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4935 unsigned long text
, text_end
, data
;
4936 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4940 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4941 (PTRACE_TYPE_ARG4
) 0);
4942 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4943 (PTRACE_TYPE_ARG4
) 0);
4944 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4945 (PTRACE_TYPE_ARG4
) 0);
4949 /* Both text and data offsets produced at compile-time (and so
4950 used by gdb) are relative to the beginning of the program,
4951 with the data segment immediately following the text segment.
4952 However, the actual runtime layout in memory may put the data
4953 somewhere else, so when we send gdb a data base-address, we
4954 use the real data base address and subtract the compile-time
4955 data base-address from it (which is just the length of the
4956 text segment). BSS immediately follows data in both
4959 *data_p
= data
- (text_end
- text
);
4968 linux_qxfer_osdata (const char *annex
,
4969 unsigned char *readbuf
, unsigned const char *writebuf
,
4970 CORE_ADDR offset
, int len
)
4972 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4975 /* Convert a native/host siginfo object, into/from the siginfo in the
4976 layout of the inferiors' architecture. */
4979 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4983 if (the_low_target
.siginfo_fixup
!= NULL
)
4984 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4986 /* If there was no callback, or the callback didn't do anything,
4987 then just do a straight memcpy. */
4991 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4993 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4998 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4999 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5003 char inf_siginfo
[sizeof (siginfo_t
)];
5005 if (current_inferior
== NULL
)
5008 pid
= lwpid_of (current_inferior
);
5011 debug_printf ("%s siginfo for lwp %d.\n",
5012 readbuf
!= NULL
? "Reading" : "Writing",
5015 if (offset
>= sizeof (siginfo
))
5018 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5021 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5022 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5023 inferior with a 64-bit GDBSERVER should look the same as debugging it
5024 with a 32-bit GDBSERVER, we need to convert it. */
5025 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5027 if (offset
+ len
> sizeof (siginfo
))
5028 len
= sizeof (siginfo
) - offset
;
5030 if (readbuf
!= NULL
)
5031 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5034 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5036 /* Convert back to ptrace layout before flushing it out. */
5037 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5039 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5046 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5047 so we notice when children change state; as the handler for the
5048 sigsuspend in my_waitpid. */
5051 sigchld_handler (int signo
)
5053 int old_errno
= errno
;
5059 /* fprintf is not async-signal-safe, so call write
5061 if (write (2, "sigchld_handler\n",
5062 sizeof ("sigchld_handler\n") - 1) < 0)
5063 break; /* just ignore */
5067 if (target_is_async_p ())
5068 async_file_mark (); /* trigger a linux_wait */
5074 linux_supports_non_stop (void)
5080 linux_async (int enable
)
5082 int previous
= (linux_event_pipe
[0] != -1);
5085 debug_printf ("linux_async (%d), previous=%d\n",
5088 if (previous
!= enable
)
5091 sigemptyset (&mask
);
5092 sigaddset (&mask
, SIGCHLD
);
5094 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5098 if (pipe (linux_event_pipe
) == -1)
5099 fatal ("creating event pipe failed.");
5101 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5102 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5104 /* Register the event loop handler. */
5105 add_file_handler (linux_event_pipe
[0],
5106 handle_target_event
, NULL
);
5108 /* Always trigger a linux_wait. */
5113 delete_file_handler (linux_event_pipe
[0]);
5115 close (linux_event_pipe
[0]);
5116 close (linux_event_pipe
[1]);
5117 linux_event_pipe
[0] = -1;
5118 linux_event_pipe
[1] = -1;
5121 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5128 linux_start_non_stop (int nonstop
)
5130 /* Register or unregister from event-loop accordingly. */
5131 linux_async (nonstop
);
5136 linux_supports_multi_process (void)
5142 linux_supports_disable_randomization (void)
5144 #ifdef HAVE_PERSONALITY
5152 linux_supports_agent (void)
5158 linux_supports_range_stepping (void)
5160 if (*the_low_target
.supports_range_stepping
== NULL
)
5163 return (*the_low_target
.supports_range_stepping
) ();
5166 /* Enumerate spufs IDs for process PID. */
5168 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5174 struct dirent
*entry
;
5176 sprintf (path
, "/proc/%ld/fd", pid
);
5177 dir
= opendir (path
);
5182 while ((entry
= readdir (dir
)) != NULL
)
5188 fd
= atoi (entry
->d_name
);
5192 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5193 if (stat (path
, &st
) != 0)
5195 if (!S_ISDIR (st
.st_mode
))
5198 if (statfs (path
, &stfs
) != 0)
5200 if (stfs
.f_type
!= SPUFS_MAGIC
)
5203 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5205 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5215 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5216 object type, using the /proc file system. */
5218 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5219 unsigned const char *writebuf
,
5220 CORE_ADDR offset
, int len
)
5222 long pid
= lwpid_of (current_inferior
);
5227 if (!writebuf
&& !readbuf
)
5235 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5238 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5239 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5244 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5251 ret
= write (fd
, writebuf
, (size_t) len
);
5253 ret
= read (fd
, readbuf
, (size_t) len
);
5259 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5260 struct target_loadseg
5262 /* Core address to which the segment is mapped. */
5264 /* VMA recorded in the program header. */
5266 /* Size of this segment in memory. */
5270 # if defined PT_GETDSBT
5271 struct target_loadmap
5273 /* Protocol version number, must be zero. */
5275 /* Pointer to the DSBT table, its size, and the DSBT index. */
5276 unsigned *dsbt_table
;
5277 unsigned dsbt_size
, dsbt_index
;
5278 /* Number of segments in this map. */
5280 /* The actual memory map. */
5281 struct target_loadseg segs
[/*nsegs*/];
5283 # define LINUX_LOADMAP PT_GETDSBT
5284 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5285 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5287 struct target_loadmap
5289 /* Protocol version number, must be zero. */
5291 /* Number of segments in this map. */
5293 /* The actual memory map. */
5294 struct target_loadseg segs
[/*nsegs*/];
5296 # define LINUX_LOADMAP PTRACE_GETFDPIC
5297 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5298 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5302 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5303 unsigned char *myaddr
, unsigned int len
)
5305 int pid
= lwpid_of (current_inferior
);
5307 struct target_loadmap
*data
= NULL
;
5308 unsigned int actual_length
, copy_length
;
5310 if (strcmp (annex
, "exec") == 0)
5311 addr
= (int) LINUX_LOADMAP_EXEC
;
5312 else if (strcmp (annex
, "interp") == 0)
5313 addr
= (int) LINUX_LOADMAP_INTERP
;
5317 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5323 actual_length
= sizeof (struct target_loadmap
)
5324 + sizeof (struct target_loadseg
) * data
->nsegs
;
5326 if (offset
< 0 || offset
> actual_length
)
5329 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5330 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5334 # define linux_read_loadmap NULL
5335 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5338 linux_process_qsupported (const char *query
)
5340 if (the_low_target
.process_qsupported
!= NULL
)
5341 the_low_target
.process_qsupported (query
);
5345 linux_supports_tracepoints (void)
5347 if (*the_low_target
.supports_tracepoints
== NULL
)
5350 return (*the_low_target
.supports_tracepoints
) ();
5354 linux_read_pc (struct regcache
*regcache
)
5356 if (the_low_target
.get_pc
== NULL
)
5359 return (*the_low_target
.get_pc
) (regcache
);
5363 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5365 gdb_assert (the_low_target
.set_pc
!= NULL
);
5367 (*the_low_target
.set_pc
) (regcache
, pc
);
5371 linux_thread_stopped (struct thread_info
*thread
)
5373 return get_thread_lwp (thread
)->stopped
;
5376 /* This exposes stop-all-threads functionality to other modules. */
5379 linux_pause_all (int freeze
)
5381 stop_all_lwps (freeze
, NULL
);
5384 /* This exposes unstop-all-threads functionality to other gdbserver
5388 linux_unpause_all (int unfreeze
)
5390 unstop_all_lwps (unfreeze
, NULL
);
5394 linux_prepare_to_access_memory (void)
5396 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5399 linux_pause_all (1);
5404 linux_done_accessing_memory (void)
5406 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5409 linux_unpause_all (1);
5413 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5414 CORE_ADDR collector
,
5417 CORE_ADDR
*jump_entry
,
5418 CORE_ADDR
*trampoline
,
5419 ULONGEST
*trampoline_size
,
5420 unsigned char *jjump_pad_insn
,
5421 ULONGEST
*jjump_pad_insn_size
,
5422 CORE_ADDR
*adjusted_insn_addr
,
5423 CORE_ADDR
*adjusted_insn_addr_end
,
5426 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5427 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5428 jump_entry
, trampoline
, trampoline_size
,
5429 jjump_pad_insn
, jjump_pad_insn_size
,
5430 adjusted_insn_addr
, adjusted_insn_addr_end
,
5434 static struct emit_ops
*
5435 linux_emit_ops (void)
5437 if (the_low_target
.emit_ops
!= NULL
)
5438 return (*the_low_target
.emit_ops
) ();
5444 linux_get_min_fast_tracepoint_insn_len (void)
5446 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5449 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5452 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5453 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5455 char filename
[PATH_MAX
];
5457 const int auxv_size
= is_elf64
5458 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5459 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5461 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5463 fd
= open (filename
, O_RDONLY
);
5469 while (read (fd
, buf
, auxv_size
) == auxv_size
5470 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5474 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5476 switch (aux
->a_type
)
5479 *phdr_memaddr
= aux
->a_un
.a_val
;
5482 *num_phdr
= aux
->a_un
.a_val
;
5488 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5490 switch (aux
->a_type
)
5493 *phdr_memaddr
= aux
->a_un
.a_val
;
5496 *num_phdr
= aux
->a_un
.a_val
;
5504 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5506 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5507 "phdr_memaddr = %ld, phdr_num = %d",
5508 (long) *phdr_memaddr
, *num_phdr
);
5515 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5518 get_dynamic (const int pid
, const int is_elf64
)
5520 CORE_ADDR phdr_memaddr
, relocation
;
5522 unsigned char *phdr_buf
;
5523 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5525 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5528 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5529 phdr_buf
= alloca (num_phdr
* phdr_size
);
5531 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5534 /* Compute relocation: it is expected to be 0 for "regular" executables,
5535 non-zero for PIE ones. */
5537 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5540 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5542 if (p
->p_type
== PT_PHDR
)
5543 relocation
= phdr_memaddr
- p
->p_vaddr
;
5547 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5549 if (p
->p_type
== PT_PHDR
)
5550 relocation
= phdr_memaddr
- p
->p_vaddr
;
5553 if (relocation
== -1)
5555 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5556 any real world executables, including PIE executables, have always
5557 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5558 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5559 or present DT_DEBUG anyway (fpc binaries are statically linked).
5561 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5563 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5568 for (i
= 0; i
< num_phdr
; i
++)
5572 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5574 if (p
->p_type
== PT_DYNAMIC
)
5575 return p
->p_vaddr
+ relocation
;
5579 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5581 if (p
->p_type
== PT_DYNAMIC
)
5582 return p
->p_vaddr
+ relocation
;
5589 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5590 can be 0 if the inferior does not yet have the library list initialized.
5591 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5592 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5595 get_r_debug (const int pid
, const int is_elf64
)
5597 CORE_ADDR dynamic_memaddr
;
5598 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5599 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5602 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5603 if (dynamic_memaddr
== 0)
5606 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5610 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5611 #ifdef DT_MIPS_RLD_MAP
5615 unsigned char buf
[sizeof (Elf64_Xword
)];
5619 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5621 if (linux_read_memory (dyn
->d_un
.d_val
,
5622 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5627 #endif /* DT_MIPS_RLD_MAP */
5629 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5630 map
= dyn
->d_un
.d_val
;
5632 if (dyn
->d_tag
== DT_NULL
)
5637 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5638 #ifdef DT_MIPS_RLD_MAP
5642 unsigned char buf
[sizeof (Elf32_Word
)];
5646 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5648 if (linux_read_memory (dyn
->d_un
.d_val
,
5649 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5654 #endif /* DT_MIPS_RLD_MAP */
5656 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5657 map
= dyn
->d_un
.d_val
;
5659 if (dyn
->d_tag
== DT_NULL
)
5663 dynamic_memaddr
+= dyn_size
;
5669 /* Read one pointer from MEMADDR in the inferior. */
5672 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5676 /* Go through a union so this works on either big or little endian
5677 hosts, when the inferior's pointer size is smaller than the size
5678 of CORE_ADDR. It is assumed the inferior's endianness is the
5679 same of the superior's. */
5682 CORE_ADDR core_addr
;
5687 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5690 if (ptr_size
== sizeof (CORE_ADDR
))
5691 *ptr
= addr
.core_addr
;
5692 else if (ptr_size
== sizeof (unsigned int))
5695 gdb_assert_not_reached ("unhandled pointer size");
5700 struct link_map_offsets
5702 /* Offset and size of r_debug.r_version. */
5703 int r_version_offset
;
5705 /* Offset and size of r_debug.r_map. */
5708 /* Offset to l_addr field in struct link_map. */
5711 /* Offset to l_name field in struct link_map. */
5714 /* Offset to l_ld field in struct link_map. */
5717 /* Offset to l_next field in struct link_map. */
5720 /* Offset to l_prev field in struct link_map. */
5724 /* Construct qXfer:libraries-svr4:read reply. */
5727 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5728 unsigned const char *writebuf
,
5729 CORE_ADDR offset
, int len
)
5732 unsigned document_len
;
5733 struct process_info_private
*const priv
= current_process ()->private;
5734 char filename
[PATH_MAX
];
5737 static const struct link_map_offsets lmo_32bit_offsets
=
5739 0, /* r_version offset. */
5740 4, /* r_debug.r_map offset. */
5741 0, /* l_addr offset in link_map. */
5742 4, /* l_name offset in link_map. */
5743 8, /* l_ld offset in link_map. */
5744 12, /* l_next offset in link_map. */
5745 16 /* l_prev offset in link_map. */
5748 static const struct link_map_offsets lmo_64bit_offsets
=
5750 0, /* r_version offset. */
5751 8, /* r_debug.r_map offset. */
5752 0, /* l_addr offset in link_map. */
5753 8, /* l_name offset in link_map. */
5754 16, /* l_ld offset in link_map. */
5755 24, /* l_next offset in link_map. */
5756 32 /* l_prev offset in link_map. */
5758 const struct link_map_offsets
*lmo
;
5759 unsigned int machine
;
5761 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5762 int allocated
= 1024;
5764 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5765 int header_done
= 0;
5767 if (writebuf
!= NULL
)
5769 if (readbuf
== NULL
)
5772 pid
= lwpid_of (current_inferior
);
5773 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5774 is_elf64
= elf_64_file_p (filename
, &machine
);
5775 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5776 ptr_size
= is_elf64
? 8 : 4;
5778 while (annex
[0] != '\0')
5784 sep
= strchr (annex
, '=');
5789 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5791 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5795 annex
= strchr (sep
, ';');
5802 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5809 if (priv
->r_debug
== 0)
5810 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5812 /* We failed to find DT_DEBUG. Such situation will not change
5813 for this inferior - do not retry it. Report it to GDB as
5814 E01, see for the reasons at the GDB solib-svr4.c side. */
5815 if (priv
->r_debug
== (CORE_ADDR
) -1)
5818 if (priv
->r_debug
!= 0)
5820 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5821 (unsigned char *) &r_version
,
5822 sizeof (r_version
)) != 0
5825 warning ("unexpected r_debug version %d", r_version
);
5827 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5828 &lm_addr
, ptr_size
) != 0)
5830 warning ("unable to read r_map from 0x%lx",
5831 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5836 document
= xmalloc (allocated
);
5837 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5838 p
= document
+ strlen (document
);
5841 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5842 &l_name
, ptr_size
) == 0
5843 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5844 &l_addr
, ptr_size
) == 0
5845 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5846 &l_ld
, ptr_size
) == 0
5847 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5848 &l_prev
, ptr_size
) == 0
5849 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5850 &l_next
, ptr_size
) == 0)
5852 unsigned char libname
[PATH_MAX
];
5854 if (lm_prev
!= l_prev
)
5856 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5857 (long) lm_prev
, (long) l_prev
);
5861 /* Ignore the first entry even if it has valid name as the first entry
5862 corresponds to the main executable. The first entry should not be
5863 skipped if the dynamic loader was loaded late by a static executable
5864 (see solib-svr4.c parameter ignore_first). But in such case the main
5865 executable does not have PT_DYNAMIC present and this function already
5866 exited above due to failed get_r_debug. */
5869 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5874 /* Not checking for error because reading may stop before
5875 we've got PATH_MAX worth of characters. */
5877 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5878 libname
[sizeof (libname
) - 1] = '\0';
5879 if (libname
[0] != '\0')
5881 /* 6x the size for xml_escape_text below. */
5882 size_t len
= 6 * strlen ((char *) libname
);
5887 /* Terminate `<library-list-svr4'. */
5892 while (allocated
< p
- document
+ len
+ 200)
5894 /* Expand to guarantee sufficient storage. */
5895 uintptr_t document_len
= p
- document
;
5897 document
= xrealloc (document
, 2 * allocated
);
5899 p
= document
+ document_len
;
5902 name
= xml_escape_text ((char *) libname
);
5903 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5904 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5905 name
, (unsigned long) lm_addr
,
5906 (unsigned long) l_addr
, (unsigned long) l_ld
);
5917 /* Empty list; terminate `<library-list-svr4'. */
5921 strcpy (p
, "</library-list-svr4>");
5923 document_len
= strlen (document
);
5924 if (offset
< document_len
)
5925 document_len
-= offset
;
5928 if (len
> document_len
)
5931 memcpy (readbuf
, document
+ offset
, len
);
5937 #ifdef HAVE_LINUX_BTRACE
5939 /* See to_enable_btrace target method. */
5941 static struct btrace_target_info
*
5942 linux_low_enable_btrace (ptid_t ptid
)
5944 struct btrace_target_info
*tinfo
;
5946 tinfo
= linux_enable_btrace (ptid
);
5950 struct thread_info
*thread
= find_thread_ptid (ptid
);
5951 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5953 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5959 /* See to_disable_btrace target method. */
5962 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5964 enum btrace_error err
;
5966 err
= linux_disable_btrace (tinfo
);
5967 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5970 /* See to_read_btrace target method. */
5973 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5976 VEC (btrace_block_s
) *btrace
;
5977 struct btrace_block
*block
;
5978 enum btrace_error err
;
5982 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5983 if (err
!= BTRACE_ERR_NONE
)
5985 if (err
== BTRACE_ERR_OVERFLOW
)
5986 buffer_grow_str0 (buffer
, "E.Overflow.");
5988 buffer_grow_str0 (buffer
, "E.Generic Error.");
5993 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5994 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5996 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5997 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5998 paddress (block
->begin
), paddress (block
->end
));
6000 buffer_grow_str0 (buffer
, "</btrace>\n");
6002 VEC_free (btrace_block_s
, btrace
);
6006 #endif /* HAVE_LINUX_BTRACE */
6008 static struct target_ops linux_target_ops
= {
6009 linux_create_inferior
,
6018 linux_fetch_registers
,
6019 linux_store_registers
,
6020 linux_prepare_to_access_memory
,
6021 linux_done_accessing_memory
,
6024 linux_look_up_symbols
,
6025 linux_request_interrupt
,
6027 linux_supports_z_point_type
,
6030 linux_stopped_by_watchpoint
,
6031 linux_stopped_data_address
,
6032 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6033 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6034 && defined(PT_TEXT_END_ADDR)
6039 #ifdef USE_THREAD_DB
6040 thread_db_get_tls_address
,
6045 hostio_last_error_from_errno
,
6048 linux_supports_non_stop
,
6050 linux_start_non_stop
,
6051 linux_supports_multi_process
,
6052 #ifdef USE_THREAD_DB
6053 thread_db_handle_monitor_command
,
6057 linux_common_core_of_thread
,
6059 linux_process_qsupported
,
6060 linux_supports_tracepoints
,
6063 linux_thread_stopped
,
6067 linux_cancel_breakpoints
,
6068 linux_stabilize_threads
,
6069 linux_install_fast_tracepoint_jump_pad
,
6071 linux_supports_disable_randomization
,
6072 linux_get_min_fast_tracepoint_insn_len
,
6073 linux_qxfer_libraries_svr4
,
6074 linux_supports_agent
,
6075 #ifdef HAVE_LINUX_BTRACE
6076 linux_supports_btrace
,
6077 linux_low_enable_btrace
,
6078 linux_low_disable_btrace
,
6079 linux_low_read_btrace
,
6086 linux_supports_range_stepping
,
6090 linux_init_signals ()
6092 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6093 to find what the cancel signal actually is. */
6094 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6095 signal (__SIGRTMIN
+1, SIG_IGN
);
6099 #ifdef HAVE_LINUX_REGSETS
6101 initialize_regsets_info (struct regsets_info
*info
)
6103 for (info
->num_regsets
= 0;
6104 info
->regsets
[info
->num_regsets
].size
>= 0;
6105 info
->num_regsets
++)
6111 initialize_low (void)
6113 struct sigaction sigchld_action
;
6114 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6115 set_target_ops (&linux_target_ops
);
6116 set_breakpoint_data (the_low_target
.breakpoint
,
6117 the_low_target
.breakpoint_len
);
6118 linux_init_signals ();
6119 linux_ptrace_init_warnings ();
6121 sigchld_action
.sa_handler
= sigchld_handler
;
6122 sigemptyset (&sigchld_action
.sa_mask
);
6123 sigchld_action
.sa_flags
= SA_RESTART
;
6124 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6126 initialize_low_arch ();