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 "linux-osdata.h"
24 #include "nat/linux-nat.h"
25 #include "nat/linux-waitpid.h"
28 #include <sys/ptrace.h>
29 #include "linux-ptrace.h"
30 #include "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 "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;
638 /* Attach to an inferior process. */
641 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
644 struct lwp_info
*new_lwp
;
646 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
649 struct buffer buffer
;
653 /* If we fail to attach to an LWP, just warn. */
654 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
655 strerror (errno
), errno
);
660 /* If we fail to attach to a process, report an error. */
661 buffer_init (&buffer
);
662 linux_ptrace_attach_warnings (lwpid
, &buffer
);
663 buffer_grow_str0 (&buffer
, "");
664 error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer
),
665 lwpid
, strerror (errno
), errno
);
669 /* If lwp is the tgid, we handle adding existing threads later.
670 Otherwise we just add lwp without bothering about any other
672 ptid
= ptid_build (lwpid
, lwpid
, 0);
675 /* Note that extracting the pid from the current inferior is
676 safe, since we're always called in the context of the same
677 process as this new thread. */
678 int pid
= pid_of (current_inferior
);
679 ptid
= ptid_build (pid
, lwpid
, 0);
682 new_lwp
= add_lwp (ptid
);
684 /* We need to wait for SIGSTOP before being able to make the next
685 ptrace call on this LWP. */
686 new_lwp
->must_set_ptrace_flags
= 1;
688 if (linux_proc_pid_is_stopped (lwpid
))
691 debug_printf ("Attached to a stopped process\n");
693 /* The process is definitely stopped. It is in a job control
694 stop, unless the kernel predates the TASK_STOPPED /
695 TASK_TRACED distinction, in which case it might be in a
696 ptrace stop. Make sure it is in a ptrace stop; from there we
697 can kill it, signal it, et cetera.
699 First make sure there is a pending SIGSTOP. Since we are
700 already attached, the process can not transition from stopped
701 to running without a PTRACE_CONT; so we know this signal will
702 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
703 probably already in the queue (unless this kernel is old
704 enough to use TASK_STOPPED for ptrace stops); but since
705 SIGSTOP is not an RT signal, it can only be queued once. */
706 kill_lwp (lwpid
, SIGSTOP
);
708 /* Finally, resume the stopped process. This will deliver the
709 SIGSTOP (or a higher priority signal, just like normal
710 PTRACE_ATTACH), which we'll catch later on. */
711 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
714 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
717 There are several cases to consider here:
719 1) gdbserver has already attached to the process and is being notified
720 of a new thread that is being created.
721 In this case we should ignore that SIGSTOP and resume the
722 process. This is handled below by setting stop_expected = 1,
723 and the fact that add_thread sets last_resume_kind ==
726 2) This is the first thread (the process thread), and we're attaching
727 to it via attach_inferior.
728 In this case we want the process thread to stop.
729 This is handled by having linux_attach set last_resume_kind ==
730 resume_stop after we return.
732 If the pid we are attaching to is also the tgid, we attach to and
733 stop all the existing threads. Otherwise, we attach to pid and
734 ignore any other threads in the same group as this pid.
736 3) GDB is connecting to gdbserver and is requesting an enumeration of all
738 In this case we want the thread to stop.
739 FIXME: This case is currently not properly handled.
740 We should wait for the SIGSTOP but don't. Things work apparently
741 because enough time passes between when we ptrace (ATTACH) and when
742 gdb makes the next ptrace call on the thread.
744 On the other hand, if we are currently trying to stop all threads, we
745 should treat the new thread as if we had sent it a SIGSTOP. This works
746 because we are guaranteed that the add_lwp call above added us to the
747 end of the list, and so the new thread has not yet reached
748 wait_for_sigstop (but will). */
749 new_lwp
->stop_expected
= 1;
753 linux_attach_lwp (unsigned long lwpid
)
755 linux_attach_lwp_1 (lwpid
, 0);
758 /* Attach to PID. If PID is the tgid, attach to it and all
762 linux_attach (unsigned long pid
)
764 /* Attach to PID. We will check for other threads
766 linux_attach_lwp_1 (pid
, 1);
767 linux_add_process (pid
, 1);
771 struct thread_info
*thread
;
773 /* Don't ignore the initial SIGSTOP if we just attached to this
774 process. It will be collected by wait shortly. */
775 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
776 thread
->last_resume_kind
= resume_stop
;
779 if (linux_proc_get_tgid (pid
) == pid
)
784 sprintf (pathname
, "/proc/%ld/task", pid
);
786 dir
= opendir (pathname
);
790 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
795 /* At this point we attached to the tgid. Scan the task for
798 int new_threads_found
;
802 while (iterations
< 2)
804 new_threads_found
= 0;
805 /* Add all the other threads. While we go through the
806 threads, new threads may be spawned. Cycle through
807 the list of threads until we have done two iterations without
808 finding new threads. */
809 while ((dp
= readdir (dir
)) != NULL
)
812 lwp
= strtoul (dp
->d_name
, NULL
, 10);
814 /* Is this a new thread? */
816 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
818 linux_attach_lwp_1 (lwp
, 0);
822 debug_printf ("Found and attached to new lwp %ld\n",
827 if (!new_threads_found
)
848 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
850 struct counter
*counter
= args
;
852 if (ptid_get_pid (entry
->id
) == counter
->pid
)
854 if (++counter
->count
> 1)
862 last_thread_of_process_p (int pid
)
864 struct counter counter
= { pid
, 0 };
866 return (find_inferior (&all_threads
,
867 second_thread_of_pid_p
, &counter
) == NULL
);
873 linux_kill_one_lwp (struct lwp_info
*lwp
)
875 struct thread_info
*thr
= get_lwp_thread (lwp
);
876 int pid
= lwpid_of (thr
);
878 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
879 there is no signal context, and ptrace(PTRACE_KILL) (or
880 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
881 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
882 alternative is to kill with SIGKILL. We only need one SIGKILL
883 per process, not one for each thread. But since we still support
884 linuxthreads, and we also support debugging programs using raw
885 clone without CLONE_THREAD, we send one for each thread. For
886 years, we used PTRACE_KILL only, so we're being a bit paranoid
887 about some old kernels where PTRACE_KILL might work better
888 (dubious if there are any such, but that's why it's paranoia), so
889 we try SIGKILL first, PTRACE_KILL second, and so we're fine
895 debug_printf ("LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
896 target_pid_to_str (ptid_of (thr
)),
897 errno
? strerror (errno
) : "OK");
900 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
902 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
903 target_pid_to_str (ptid_of (thr
)),
904 errno
? strerror (errno
) : "OK");
907 /* Callback for `find_inferior'. Kills an lwp of a given process,
908 except the leader. */
911 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
913 struct thread_info
*thread
= (struct thread_info
*) entry
;
914 struct lwp_info
*lwp
= get_thread_lwp (thread
);
916 int pid
= * (int *) args
;
918 if (ptid_get_pid (entry
->id
) != pid
)
921 /* We avoid killing the first thread here, because of a Linux kernel (at
922 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
923 the children get a chance to be reaped, it will remain a zombie
926 if (lwpid_of (thread
) == pid
)
929 debug_printf ("lkop: is last of process %s\n",
930 target_pid_to_str (entry
->id
));
936 linux_kill_one_lwp (lwp
);
938 /* Make sure it died. The loop is most likely unnecessary. */
939 pid
= linux_wait_for_event (thread
->entry
.id
, &wstat
, __WALL
);
940 } while (pid
> 0 && WIFSTOPPED (wstat
));
948 struct process_info
*process
;
949 struct lwp_info
*lwp
;
953 process
= find_process_pid (pid
);
957 /* If we're killing a running inferior, make sure it is stopped
958 first, as PTRACE_KILL will not work otherwise. */
959 stop_all_lwps (0, NULL
);
961 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
963 /* See the comment in linux_kill_one_lwp. We did not kill the first
964 thread in the list, so do so now. */
965 lwp
= find_lwp_pid (pid_to_ptid (pid
));
970 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
975 struct thread_info
*thr
= get_lwp_thread (lwp
);
978 debug_printf ("lk_1: killing lwp %ld, for pid: %d\n",
979 lwpid_of (thr
), pid
);
983 linux_kill_one_lwp (lwp
);
985 /* Make sure it died. The loop is most likely unnecessary. */
986 lwpid
= linux_wait_for_event (thr
->entry
.id
, &wstat
, __WALL
);
987 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
990 the_target
->mourn (process
);
992 /* Since we presently can only stop all lwps of all processes, we
993 need to unstop lwps of other processes. */
994 unstop_all_lwps (0, NULL
);
998 /* Get pending signal of THREAD, for detaching purposes. This is the
999 signal the thread last stopped for, which we need to deliver to the
1000 thread when detaching, otherwise, it'd be suppressed/lost. */
1003 get_detach_signal (struct thread_info
*thread
)
1005 enum gdb_signal signo
= GDB_SIGNAL_0
;
1007 struct lwp_info
*lp
= get_thread_lwp (thread
);
1009 if (lp
->status_pending_p
)
1010 status
= lp
->status_pending
;
1013 /* If the thread had been suspended by gdbserver, and it stopped
1014 cleanly, then it'll have stopped with SIGSTOP. But we don't
1015 want to deliver that SIGSTOP. */
1016 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1017 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1020 /* Otherwise, we may need to deliver the signal we
1022 status
= lp
->last_status
;
1025 if (!WIFSTOPPED (status
))
1028 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1029 target_pid_to_str (ptid_of (thread
)));
1033 /* Extended wait statuses aren't real SIGTRAPs. */
1034 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1037 debug_printf ("GPS: lwp %s had stopped with extended "
1038 "status: no pending signal\n",
1039 target_pid_to_str (ptid_of (thread
)));
1043 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1045 if (program_signals_p
&& !program_signals
[signo
])
1048 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1049 target_pid_to_str (ptid_of (thread
)),
1050 gdb_signal_to_string (signo
));
1053 else if (!program_signals_p
1054 /* If we have no way to know which signals GDB does not
1055 want to have passed to the program, assume
1056 SIGTRAP/SIGINT, which is GDB's default. */
1057 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1060 debug_printf ("GPS: lwp %s had signal %s, "
1061 "but we don't know if we should pass it. "
1062 "Default to not.\n",
1063 target_pid_to_str (ptid_of (thread
)),
1064 gdb_signal_to_string (signo
));
1070 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1071 target_pid_to_str (ptid_of (thread
)),
1072 gdb_signal_to_string (signo
));
1074 return WSTOPSIG (status
);
1079 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1081 struct thread_info
*thread
= (struct thread_info
*) entry
;
1082 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1083 int pid
= * (int *) args
;
1086 if (ptid_get_pid (entry
->id
) != pid
)
1089 /* If there is a pending SIGSTOP, get rid of it. */
1090 if (lwp
->stop_expected
)
1093 debug_printf ("Sending SIGCONT to %s\n",
1094 target_pid_to_str (ptid_of (thread
)));
1096 kill_lwp (lwpid_of (thread
), SIGCONT
);
1097 lwp
->stop_expected
= 0;
1100 /* Flush any pending changes to the process's registers. */
1101 regcache_invalidate_thread (thread
);
1103 /* Pass on any pending signal for this thread. */
1104 sig
= get_detach_signal (thread
);
1106 /* Finally, let it resume. */
1107 if (the_low_target
.prepare_to_resume
!= NULL
)
1108 the_low_target
.prepare_to_resume (lwp
);
1109 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1110 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1111 error (_("Can't detach %s: %s"),
1112 target_pid_to_str (ptid_of (thread
)),
1120 linux_detach (int pid
)
1122 struct process_info
*process
;
1124 process
= find_process_pid (pid
);
1125 if (process
== NULL
)
1128 /* Stop all threads before detaching. First, ptrace requires that
1129 the thread is stopped to sucessfully detach. Second, thread_db
1130 may need to uninstall thread event breakpoints from memory, which
1131 only works with a stopped process anyway. */
1132 stop_all_lwps (0, NULL
);
1134 #ifdef USE_THREAD_DB
1135 thread_db_detach (process
);
1138 /* Stabilize threads (move out of jump pads). */
1139 stabilize_threads ();
1141 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1143 the_target
->mourn (process
);
1145 /* Since we presently can only stop all lwps of all processes, we
1146 need to unstop lwps of other processes. */
1147 unstop_all_lwps (0, NULL
);
1151 /* Remove all LWPs that belong to process PROC from the lwp list. */
1154 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1156 struct thread_info
*thread
= (struct thread_info
*) entry
;
1157 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1158 struct process_info
*process
= proc
;
1160 if (pid_of (thread
) == pid_of (process
))
1167 linux_mourn (struct process_info
*process
)
1169 struct process_info_private
*priv
;
1171 #ifdef USE_THREAD_DB
1172 thread_db_mourn (process
);
1175 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1177 /* Freeing all private data. */
1178 priv
= process
->private;
1179 free (priv
->arch_private
);
1181 process
->private = NULL
;
1183 remove_process (process
);
1187 linux_join (int pid
)
1192 ret
= my_waitpid (pid
, &status
, 0);
1193 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1195 } while (ret
!= -1 || errno
!= ECHILD
);
1198 /* Return nonzero if the given thread is still alive. */
1200 linux_thread_alive (ptid_t ptid
)
1202 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1204 /* We assume we always know if a thread exits. If a whole process
1205 exited but we still haven't been able to report it to GDB, we'll
1206 hold on to the last lwp of the dead process. */
1213 /* Return 1 if this lwp has an interesting status pending. */
1215 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1217 struct thread_info
*thread
= (struct thread_info
*) entry
;
1218 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1219 ptid_t ptid
= * (ptid_t
*) arg
;
1221 /* Check if we're only interested in events from a specific process
1223 if (!ptid_equal (minus_one_ptid
, ptid
)
1224 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1227 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1228 report any status pending the LWP may have. */
1229 if (thread
->last_resume_kind
== resume_stop
1230 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1233 return lwp
->status_pending_p
;
1237 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1239 ptid_t ptid
= *(ptid_t
*) data
;
1242 if (ptid_get_lwp (ptid
) != 0)
1243 lwp
= ptid_get_lwp (ptid
);
1245 lwp
= ptid_get_pid (ptid
);
1247 if (ptid_get_lwp (entry
->id
) == lwp
)
1254 find_lwp_pid (ptid_t ptid
)
1256 struct inferior_list_entry
*thread
1257 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1262 return get_thread_lwp ((struct thread_info
*) thread
);
1265 /* Return the number of known LWPs in the tgid given by PID. */
1270 struct inferior_list_entry
*inf
, *tmp
;
1273 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1275 if (ptid_get_pid (inf
->id
) == pid
)
1282 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1283 their exits until all other threads in the group have exited. */
1286 check_zombie_leaders (void)
1288 struct process_info
*proc
, *tmp
;
1290 ALL_PROCESSES (proc
, tmp
)
1292 pid_t leader_pid
= pid_of (proc
);
1293 struct lwp_info
*leader_lp
;
1295 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1298 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1299 "num_lwps=%d, zombie=%d\n",
1300 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1301 linux_proc_pid_is_zombie (leader_pid
));
1303 if (leader_lp
!= NULL
1304 /* Check if there are other threads in the group, as we may
1305 have raced with the inferior simply exiting. */
1306 && !last_thread_of_process_p (leader_pid
)
1307 && linux_proc_pid_is_zombie (leader_pid
))
1309 /* A leader zombie can mean one of two things:
1311 - It exited, and there's an exit status pending
1312 available, or only the leader exited (not the whole
1313 program). In the latter case, we can't waitpid the
1314 leader's exit status until all other threads are gone.
1316 - There are 3 or more threads in the group, and a thread
1317 other than the leader exec'd. On an exec, the Linux
1318 kernel destroys all other threads (except the execing
1319 one) in the thread group, and resets the execing thread's
1320 tid to the tgid. No exit notification is sent for the
1321 execing thread -- from the ptracer's perspective, it
1322 appears as though the execing thread just vanishes.
1323 Until we reap all other threads except the leader and the
1324 execing thread, the leader will be zombie, and the
1325 execing thread will be in `D (disc sleep)'. As soon as
1326 all other threads are reaped, the execing thread changes
1327 it's tid to the tgid, and the previous (zombie) leader
1328 vanishes, giving place to the "new" leader. We could try
1329 distinguishing the exit and exec cases, by waiting once
1330 more, and seeing if something comes out, but it doesn't
1331 sound useful. The previous leader _does_ go away, and
1332 we'll re-add the new one once we see the exec event
1333 (which is just the same as what would happen if the
1334 previous leader did exit voluntarily before some other
1339 "CZL: Thread group leader %d zombie "
1340 "(it exited, or another thread execd).\n",
1343 delete_lwp (leader_lp
);
1348 /* Callback for `find_inferior'. Returns the first LWP that is not
1349 stopped. ARG is a PTID filter. */
1352 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1354 struct thread_info
*thr
= (struct thread_info
*) entry
;
1355 struct lwp_info
*lwp
;
1356 ptid_t filter
= *(ptid_t
*) arg
;
1358 if (!ptid_match (ptid_of (thr
), filter
))
1361 lwp
= get_thread_lwp (thr
);
1368 /* This function should only be called if the LWP got a SIGTRAP.
1370 Handle any tracepoint steps or hits. Return true if a tracepoint
1371 event was handled, 0 otherwise. */
1374 handle_tracepoints (struct lwp_info
*lwp
)
1376 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1377 int tpoint_related_event
= 0;
1379 /* If this tracepoint hit causes a tracing stop, we'll immediately
1380 uninsert tracepoints. To do this, we temporarily pause all
1381 threads, unpatch away, and then unpause threads. We need to make
1382 sure the unpausing doesn't resume LWP too. */
1385 /* And we need to be sure that any all-threads-stopping doesn't try
1386 to move threads out of the jump pads, as it could deadlock the
1387 inferior (LWP could be in the jump pad, maybe even holding the
1390 /* Do any necessary step collect actions. */
1391 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1393 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1395 /* See if we just hit a tracepoint and do its main collect
1397 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1401 gdb_assert (lwp
->suspended
== 0);
1402 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1404 if (tpoint_related_event
)
1407 debug_printf ("got a tracepoint event\n");
1414 /* Convenience wrapper. Returns true if LWP is presently collecting a
1418 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1419 struct fast_tpoint_collect_status
*status
)
1421 CORE_ADDR thread_area
;
1422 struct thread_info
*thread
= get_lwp_thread (lwp
);
1424 if (the_low_target
.get_thread_area
== NULL
)
1427 /* Get the thread area address. This is used to recognize which
1428 thread is which when tracing with the in-process agent library.
1429 We don't read anything from the address, and treat it as opaque;
1430 it's the address itself that we assume is unique per-thread. */
1431 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1434 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1437 /* The reason we resume in the caller, is because we want to be able
1438 to pass lwp->status_pending as WSTAT, and we need to clear
1439 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1440 refuses to resume. */
1443 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1445 struct thread_info
*saved_inferior
;
1447 saved_inferior
= current_inferior
;
1448 current_inferior
= get_lwp_thread (lwp
);
1451 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1452 && supports_fast_tracepoints ()
1453 && agent_loaded_p ())
1455 struct fast_tpoint_collect_status status
;
1459 debug_printf ("Checking whether LWP %ld needs to move out of the "
1461 lwpid_of (current_inferior
));
1463 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1466 || (WSTOPSIG (*wstat
) != SIGILL
1467 && WSTOPSIG (*wstat
) != SIGFPE
1468 && WSTOPSIG (*wstat
) != SIGSEGV
1469 && WSTOPSIG (*wstat
) != SIGBUS
))
1471 lwp
->collecting_fast_tracepoint
= r
;
1475 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1477 /* Haven't executed the original instruction yet.
1478 Set breakpoint there, and wait till it's hit,
1479 then single-step until exiting the jump pad. */
1480 lwp
->exit_jump_pad_bkpt
1481 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1485 debug_printf ("Checking whether LWP %ld needs to move out of "
1486 "the jump pad...it does\n",
1487 lwpid_of (current_inferior
));
1488 current_inferior
= saved_inferior
;
1495 /* If we get a synchronous signal while collecting, *and*
1496 while executing the (relocated) original instruction,
1497 reset the PC to point at the tpoint address, before
1498 reporting to GDB. Otherwise, it's an IPA lib bug: just
1499 report the signal to GDB, and pray for the best. */
1501 lwp
->collecting_fast_tracepoint
= 0;
1504 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1505 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1508 struct regcache
*regcache
;
1510 /* The si_addr on a few signals references the address
1511 of the faulting instruction. Adjust that as
1513 if ((WSTOPSIG (*wstat
) == SIGILL
1514 || WSTOPSIG (*wstat
) == SIGFPE
1515 || WSTOPSIG (*wstat
) == SIGBUS
1516 || WSTOPSIG (*wstat
) == SIGSEGV
)
1517 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
1518 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1519 /* Final check just to make sure we don't clobber
1520 the siginfo of non-kernel-sent signals. */
1521 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1523 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1524 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_inferior
),
1525 (PTRACE_TYPE_ARG3
) 0, &info
);
1528 regcache
= get_thread_regcache (current_inferior
, 1);
1529 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1530 lwp
->stop_pc
= status
.tpoint_addr
;
1532 /* Cancel any fast tracepoint lock this thread was
1534 force_unlock_trace_buffer ();
1537 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1540 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1541 "stopping all threads momentarily.\n");
1543 stop_all_lwps (1, lwp
);
1544 cancel_breakpoints ();
1546 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1547 lwp
->exit_jump_pad_bkpt
= NULL
;
1549 unstop_all_lwps (1, lwp
);
1551 gdb_assert (lwp
->suspended
>= 0);
1557 debug_printf ("Checking whether LWP %ld needs to move out of the "
1559 lwpid_of (current_inferior
));
1561 current_inferior
= saved_inferior
;
1565 /* Enqueue one signal in the "signals to report later when out of the
1569 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1571 struct pending_signals
*p_sig
;
1572 struct thread_info
*thread
= get_lwp_thread (lwp
);
1575 debug_printf ("Deferring signal %d for LWP %ld.\n",
1576 WSTOPSIG (*wstat
), lwpid_of (thread
));
1580 struct pending_signals
*sig
;
1582 for (sig
= lwp
->pending_signals_to_report
;
1585 debug_printf (" Already queued %d\n",
1588 debug_printf (" (no more currently queued signals)\n");
1591 /* Don't enqueue non-RT signals if they are already in the deferred
1592 queue. (SIGSTOP being the easiest signal to see ending up here
1594 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1596 struct pending_signals
*sig
;
1598 for (sig
= lwp
->pending_signals_to_report
;
1602 if (sig
->signal
== WSTOPSIG (*wstat
))
1605 debug_printf ("Not requeuing already queued non-RT signal %d"
1614 p_sig
= xmalloc (sizeof (*p_sig
));
1615 p_sig
->prev
= lwp
->pending_signals_to_report
;
1616 p_sig
->signal
= WSTOPSIG (*wstat
);
1617 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1618 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1621 lwp
->pending_signals_to_report
= p_sig
;
1624 /* Dequeue one signal from the "signals to report later when out of
1625 the jump pad" list. */
1628 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1630 struct thread_info
*thread
= get_lwp_thread (lwp
);
1632 if (lwp
->pending_signals_to_report
!= NULL
)
1634 struct pending_signals
**p_sig
;
1636 p_sig
= &lwp
->pending_signals_to_report
;
1637 while ((*p_sig
)->prev
!= NULL
)
1638 p_sig
= &(*p_sig
)->prev
;
1640 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1641 if ((*p_sig
)->info
.si_signo
!= 0)
1642 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1648 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1649 WSTOPSIG (*wstat
), lwpid_of (thread
));
1653 struct pending_signals
*sig
;
1655 for (sig
= lwp
->pending_signals_to_report
;
1658 debug_printf (" Still queued %d\n",
1661 debug_printf (" (no more queued signals)\n");
1670 /* Arrange for a breakpoint to be hit again later. We don't keep the
1671 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1672 will handle the current event, eventually we will resume this LWP,
1673 and this breakpoint will trap again. */
1676 cancel_breakpoint (struct lwp_info
*lwp
)
1678 struct thread_info
*saved_inferior
;
1680 /* There's nothing to do if we don't support breakpoints. */
1681 if (!supports_breakpoints ())
1684 /* breakpoint_at reads from current inferior. */
1685 saved_inferior
= current_inferior
;
1686 current_inferior
= get_lwp_thread (lwp
);
1688 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1691 debug_printf ("CB: Push back breakpoint for %s\n",
1692 target_pid_to_str (ptid_of (current_inferior
)));
1694 /* Back up the PC if necessary. */
1695 if (the_low_target
.decr_pc_after_break
)
1697 struct regcache
*regcache
1698 = get_thread_regcache (current_inferior
, 1);
1699 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1702 current_inferior
= saved_inferior
;
1708 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1709 paddress (lwp
->stop_pc
),
1710 target_pid_to_str (ptid_of (current_inferior
)));
1713 current_inferior
= saved_inferior
;
1717 /* Do low-level handling of the event, and check if we should go on
1718 and pass it to caller code. Return the affected lwp if we are, or
1721 static struct lwp_info
*
1722 linux_low_filter_event (ptid_t filter_ptid
, int lwpid
, int wstat
)
1724 struct lwp_info
*child
;
1725 struct thread_info
*thread
;
1727 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1729 /* If we didn't find a process, one of two things presumably happened:
1730 - A process we started and then detached from has exited. Ignore it.
1731 - A process we are controlling has forked and the new child's stop
1732 was reported to us by the kernel. Save its PID. */
1733 if (child
== NULL
&& WIFSTOPPED (wstat
))
1735 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1738 else if (child
== NULL
)
1741 thread
= get_lwp_thread (child
);
1745 child
->last_status
= wstat
;
1747 if (WIFSTOPPED (wstat
))
1749 struct process_info
*proc
;
1751 /* Architecture-specific setup after inferior is running. This
1752 needs to happen after we have attached to the inferior and it
1753 is stopped for the first time, but before we access any
1754 inferior registers. */
1755 proc
= find_process_pid (pid_of (thread
));
1756 if (proc
->private->new_inferior
)
1758 struct thread_info
*saved_inferior
;
1760 saved_inferior
= current_inferior
;
1761 current_inferior
= thread
;
1763 the_low_target
.arch_setup ();
1765 current_inferior
= saved_inferior
;
1767 proc
->private->new_inferior
= 0;
1771 /* Store the STOP_PC, with adjustment applied. This depends on the
1772 architecture being defined already (so that CHILD has a valid
1773 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1775 if (WIFSTOPPED (wstat
))
1778 && the_low_target
.get_pc
!= NULL
)
1780 struct thread_info
*saved_inferior
;
1781 struct regcache
*regcache
;
1784 saved_inferior
= current_inferior
;
1785 current_inferior
= thread
;
1786 regcache
= get_thread_regcache (current_inferior
, 1);
1787 pc
= (*the_low_target
.get_pc
) (regcache
);
1788 debug_printf ("linux_low_filter_event: pc is 0x%lx\n", (long) pc
);
1789 current_inferior
= saved_inferior
;
1792 child
->stop_pc
= get_stop_pc (child
);
1795 /* Fetch the possibly triggered data watchpoint info and store it in
1798 On some archs, like x86, that use debug registers to set
1799 watchpoints, it's possible that the way to know which watched
1800 address trapped, is to check the register that is used to select
1801 which address to watch. Problem is, between setting the
1802 watchpoint and reading back which data address trapped, the user
1803 may change the set of watchpoints, and, as a consequence, GDB
1804 changes the debug registers in the inferior. To avoid reading
1805 back a stale stopped-data-address when that happens, we cache in
1806 LP the fact that a watchpoint trapped, and the corresponding data
1807 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1808 changes the debug registers meanwhile, we have the cached data we
1811 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
)
1813 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1815 child
->stopped_by_watchpoint
= 0;
1819 struct thread_info
*saved_inferior
;
1821 saved_inferior
= current_inferior
;
1822 current_inferior
= thread
;
1824 child
->stopped_by_watchpoint
1825 = the_low_target
.stopped_by_watchpoint ();
1827 if (child
->stopped_by_watchpoint
)
1829 if (the_low_target
.stopped_data_address
!= NULL
)
1830 child
->stopped_data_address
1831 = the_low_target
.stopped_data_address ();
1833 child
->stopped_data_address
= 0;
1836 current_inferior
= saved_inferior
;
1840 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1842 linux_enable_event_reporting (lwpid
);
1843 child
->must_set_ptrace_flags
= 0;
1846 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1847 && wstat
>> 16 != 0)
1849 handle_extended_wait (child
, wstat
);
1853 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1854 && child
->stop_expected
)
1857 debug_printf ("Expected stop.\n");
1858 child
->stop_expected
= 0;
1860 if (thread
->last_resume_kind
== resume_stop
)
1862 /* We want to report the stop to the core. Treat the
1863 SIGSTOP as a normal event. */
1865 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1867 /* Stopping threads. We don't want this SIGSTOP to end up
1868 pending in the FILTER_PTID handling below. */
1873 /* Filter out the event. */
1874 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1879 /* Check if the thread has exited. */
1880 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1881 && num_lwps (pid_of (thread
)) > 1)
1884 debug_printf ("LLW: %d exited.\n", lwpid
);
1886 /* If there is at least one more LWP, then the exit signal
1887 was not the end of the debugged application and should be
1893 if (!ptid_match (ptid_of (thread
), filter_ptid
))
1896 debug_printf ("LWP %d got an event %06x, leaving pending.\n",
1899 if (WIFSTOPPED (wstat
))
1901 child
->status_pending_p
= 1;
1902 child
->status_pending
= wstat
;
1904 if (WSTOPSIG (wstat
) != SIGSTOP
)
1906 /* Cancel breakpoint hits. The breakpoint may be
1907 removed before we fetch events from this process to
1908 report to the core. It is best not to assume the
1909 moribund breakpoints heuristic always handles these
1910 cases --- it could be too many events go through to
1911 the core before this one is handled. All-stop always
1912 cancels breakpoint hits in all threads. */
1914 && WSTOPSIG (wstat
) == SIGTRAP
1915 && cancel_breakpoint (child
))
1917 /* Throw away the SIGTRAP. */
1918 child
->status_pending_p
= 0;
1921 debug_printf ("LLW: LWP %d hit a breakpoint while"
1922 " waiting for another process;"
1923 " cancelled it\n", lwpid
);
1927 else if (WIFEXITED (wstat
) || WIFSIGNALED (wstat
))
1930 debug_printf ("LLWE: process %d exited while fetching "
1931 "event from another LWP\n", lwpid
);
1933 /* This was the last lwp in the process. Since events are
1934 serialized to GDB core, and we can't report this one
1935 right now, but GDB core and the other target layers will
1936 want to be notified about the exit code/signal, leave the
1937 status pending for the next time we're able to report
1939 mark_lwp_dead (child
, wstat
);
1948 /* When the event-loop is doing a step-over, this points at the thread
1950 ptid_t step_over_bkpt
;
1952 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1953 match FILTER_PTID (leaving others pending). The PTIDs can be:
1954 minus_one_ptid, to specify any child; a pid PTID, specifying all
1955 lwps of a thread group; or a PTID representing a single lwp. Store
1956 the stop status through the status pointer WSTAT. OPTIONS is
1957 passed to the waitpid call. Return 0 if no event was found and
1958 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1959 was found. Return the PID of the stopped child otherwise. */
1962 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1963 int *wstatp
, int options
)
1965 struct thread_info
*event_thread
;
1966 struct lwp_info
*event_child
, *requested_child
;
1967 sigset_t block_mask
, prev_mask
;
1970 /* N.B. event_thread points to the thread_info struct that contains
1971 event_child. Keep them in sync. */
1972 event_thread
= NULL
;
1974 requested_child
= NULL
;
1976 /* Check for a lwp with a pending status. */
1978 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
1980 event_thread
= (struct thread_info
*)
1981 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
1982 if (event_thread
!= NULL
)
1983 event_child
= get_thread_lwp (event_thread
);
1984 if (debug_threads
&& event_thread
)
1985 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
1987 else if (!ptid_equal (filter_ptid
, null_ptid
))
1989 requested_child
= find_lwp_pid (filter_ptid
);
1991 if (stopping_threads
== NOT_STOPPING_THREADS
1992 && requested_child
->status_pending_p
1993 && requested_child
->collecting_fast_tracepoint
)
1995 enqueue_one_deferred_signal (requested_child
,
1996 &requested_child
->status_pending
);
1997 requested_child
->status_pending_p
= 0;
1998 requested_child
->status_pending
= 0;
1999 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2002 if (requested_child
->suspended
2003 && requested_child
->status_pending_p
)
2004 fatal ("requesting an event out of a suspended child?");
2006 if (requested_child
->status_pending_p
)
2008 event_child
= requested_child
;
2009 event_thread
= get_lwp_thread (event_child
);
2013 if (event_child
!= NULL
)
2016 debug_printf ("Got an event from pending child %ld (%04x)\n",
2017 lwpid_of (event_thread
), event_child
->status_pending
);
2018 *wstatp
= event_child
->status_pending
;
2019 event_child
->status_pending_p
= 0;
2020 event_child
->status_pending
= 0;
2021 current_inferior
= event_thread
;
2022 return lwpid_of (event_thread
);
2025 /* But if we don't find a pending event, we'll have to wait.
2027 We only enter this loop if no process has a pending wait status.
2028 Thus any action taken in response to a wait status inside this
2029 loop is responding as soon as we detect the status, not after any
2032 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2033 all signals while here. */
2034 sigfillset (&block_mask
);
2035 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2037 while (event_child
== NULL
)
2041 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2044 - If the thread group leader exits while other threads in the
2045 thread group still exist, waitpid(TGID, ...) hangs. That
2046 waitpid won't return an exit status until the other threads
2047 in the group are reaped.
2049 - When a non-leader thread execs, that thread just vanishes
2050 without reporting an exit (so we'd hang if we waited for it
2051 explicitly in that case). The exec event is reported to
2052 the TGID pid (although we don't currently enable exec
2055 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2058 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2059 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2065 debug_printf ("LLW: waitpid %ld received %s\n",
2066 (long) ret
, status_to_str (*wstatp
));
2069 event_child
= linux_low_filter_event (filter_ptid
,
2071 if (event_child
!= NULL
)
2073 /* We got an event to report to the core. */
2074 event_thread
= get_lwp_thread (event_child
);
2078 /* Retry until nothing comes out of waitpid. A single
2079 SIGCHLD can indicate more than one child stopped. */
2083 /* Check for zombie thread group leaders. Those can't be reaped
2084 until all other threads in the thread group are. */
2085 check_zombie_leaders ();
2087 /* If there are no resumed children left in the set of LWPs we
2088 want to wait for, bail. We can't just block in
2089 waitpid/sigsuspend, because lwps might have been left stopped
2090 in trace-stop state, and we'd be stuck forever waiting for
2091 their status to change (which would only happen if we resumed
2092 them). Even if WNOHANG is set, this return code is preferred
2093 over 0 (below), as it is more detailed. */
2094 if ((find_inferior (&all_threads
,
2095 not_stopped_callback
,
2096 &wait_ptid
) == NULL
))
2099 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2100 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2104 /* No interesting event to report to the caller. */
2105 if ((options
& WNOHANG
))
2108 debug_printf ("WNOHANG set, no event found\n");
2110 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2114 /* Block until we get an event reported with SIGCHLD. */
2116 debug_printf ("sigsuspend'ing\n");
2118 sigsuspend (&prev_mask
);
2119 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2123 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2125 current_inferior
= event_thread
;
2127 /* Check for thread exit. */
2128 if (! WIFSTOPPED (*wstatp
))
2130 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2133 debug_printf ("LWP %d is the last lwp of process. "
2134 "Process %ld exiting.\n",
2135 pid_of (event_thread
), lwpid_of (event_thread
));
2136 return lwpid_of (event_thread
);
2139 return lwpid_of (event_thread
);
2142 /* Wait for an event from child(ren) PTID. PTIDs can be:
2143 minus_one_ptid, to specify any child; a pid PTID, specifying all
2144 lwps of a thread group; or a PTID representing a single lwp. Store
2145 the stop status through the status pointer WSTAT. OPTIONS is
2146 passed to the waitpid call. Return 0 if no event was found and
2147 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2148 was found. Return the PID of the stopped child otherwise. */
2151 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2153 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2156 /* Count the LWP's that have had events. */
2159 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2161 struct thread_info
*thread
= (struct thread_info
*) entry
;
2162 struct lwp_info
*lp
= get_thread_lwp (thread
);
2165 gdb_assert (count
!= NULL
);
2167 /* Count only resumed LWPs that have a SIGTRAP event pending that
2168 should be reported to GDB. */
2169 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2170 && thread
->last_resume_kind
!= resume_stop
2171 && lp
->status_pending_p
2172 && WIFSTOPPED (lp
->status_pending
)
2173 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2174 && !breakpoint_inserted_here (lp
->stop_pc
))
2180 /* Select the LWP (if any) that is currently being single-stepped. */
2183 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2185 struct thread_info
*thread
= (struct thread_info
*) entry
;
2186 struct lwp_info
*lp
= get_thread_lwp (thread
);
2188 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2189 && thread
->last_resume_kind
== resume_step
2190 && lp
->status_pending_p
)
2196 /* Select the Nth LWP that has had a SIGTRAP event that should be
2200 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2202 struct thread_info
*thread
= (struct thread_info
*) entry
;
2203 struct lwp_info
*lp
= get_thread_lwp (thread
);
2204 int *selector
= data
;
2206 gdb_assert (selector
!= NULL
);
2208 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2209 if (thread
->last_resume_kind
!= resume_stop
2210 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2211 && lp
->status_pending_p
2212 && WIFSTOPPED (lp
->status_pending
)
2213 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2214 && !breakpoint_inserted_here (lp
->stop_pc
))
2215 if ((*selector
)-- == 0)
2222 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2224 struct thread_info
*thread
= (struct thread_info
*) entry
;
2225 struct lwp_info
*lp
= get_thread_lwp (thread
);
2226 struct lwp_info
*event_lp
= data
;
2228 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2232 /* If a LWP other than the LWP that we're reporting an event for has
2233 hit a GDB breakpoint (as opposed to some random trap signal),
2234 then just arrange for it to hit it again later. We don't keep
2235 the SIGTRAP status and don't forward the SIGTRAP signal to the
2236 LWP. We will handle the current event, eventually we will resume
2237 all LWPs, and this one will get its breakpoint trap again.
2239 If we do not do this, then we run the risk that the user will
2240 delete or disable the breakpoint, but the LWP will have already
2243 if (thread
->last_resume_kind
!= resume_stop
2244 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2245 && lp
->status_pending_p
2246 && WIFSTOPPED (lp
->status_pending
)
2247 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2249 && !lp
->stopped_by_watchpoint
2250 && cancel_breakpoint (lp
))
2251 /* Throw away the SIGTRAP. */
2252 lp
->status_pending_p
= 0;
2258 linux_cancel_breakpoints (void)
2260 find_inferior (&all_threads
, cancel_breakpoints_callback
, NULL
);
2263 /* Select one LWP out of those that have events pending. */
2266 select_event_lwp (struct lwp_info
**orig_lp
)
2269 int random_selector
;
2270 struct thread_info
*event_thread
;
2272 /* Give preference to any LWP that is being single-stepped. */
2274 = (struct thread_info
*) find_inferior (&all_threads
,
2275 select_singlestep_lwp_callback
,
2277 if (event_thread
!= NULL
)
2280 debug_printf ("SEL: Select single-step %s\n",
2281 target_pid_to_str (ptid_of (event_thread
)));
2285 /* No single-stepping LWP. Select one at random, out of those
2286 which have had SIGTRAP events. */
2288 /* First see how many SIGTRAP events we have. */
2289 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2291 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2292 random_selector
= (int)
2293 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2295 if (debug_threads
&& num_events
> 1)
2296 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2297 num_events
, random_selector
);
2300 = (struct thread_info
*) find_inferior (&all_threads
,
2301 select_event_lwp_callback
,
2305 if (event_thread
!= NULL
)
2307 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2309 /* Switch the event LWP. */
2310 *orig_lp
= event_lp
;
2314 /* Decrement the suspend count of an LWP. */
2317 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2319 struct thread_info
*thread
= (struct thread_info
*) entry
;
2320 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2322 /* Ignore EXCEPT. */
2328 gdb_assert (lwp
->suspended
>= 0);
2332 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2336 unsuspend_all_lwps (struct lwp_info
*except
)
2338 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2341 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2342 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2344 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2345 static ptid_t
linux_wait_1 (ptid_t ptid
,
2346 struct target_waitstatus
*ourstatus
,
2347 int target_options
);
2349 /* Stabilize threads (move out of jump pads).
2351 If a thread is midway collecting a fast tracepoint, we need to
2352 finish the collection and move it out of the jump pad before
2353 reporting the signal.
2355 This avoids recursion while collecting (when a signal arrives
2356 midway, and the signal handler itself collects), which would trash
2357 the trace buffer. In case the user set a breakpoint in a signal
2358 handler, this avoids the backtrace showing the jump pad, etc..
2359 Most importantly, there are certain things we can't do safely if
2360 threads are stopped in a jump pad (or in its callee's). For
2363 - starting a new trace run. A thread still collecting the
2364 previous run, could trash the trace buffer when resumed. The trace
2365 buffer control structures would have been reset but the thread had
2366 no way to tell. The thread could even midway memcpy'ing to the
2367 buffer, which would mean that when resumed, it would clobber the
2368 trace buffer that had been set for a new run.
2370 - we can't rewrite/reuse the jump pads for new tracepoints
2371 safely. Say you do tstart while a thread is stopped midway while
2372 collecting. When the thread is later resumed, it finishes the
2373 collection, and returns to the jump pad, to execute the original
2374 instruction that was under the tracepoint jump at the time the
2375 older run had been started. If the jump pad had been rewritten
2376 since for something else in the new run, the thread would now
2377 execute the wrong / random instructions. */
2380 linux_stabilize_threads (void)
2382 struct thread_info
*save_inferior
;
2383 struct thread_info
*thread_stuck
;
2386 = (struct thread_info
*) find_inferior (&all_threads
,
2387 stuck_in_jump_pad_callback
,
2389 if (thread_stuck
!= NULL
)
2392 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2393 lwpid_of (thread_stuck
));
2397 save_inferior
= current_inferior
;
2399 stabilizing_threads
= 1;
2402 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2404 /* Loop until all are stopped out of the jump pads. */
2405 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2407 struct target_waitstatus ourstatus
;
2408 struct lwp_info
*lwp
;
2411 /* Note that we go through the full wait even loop. While
2412 moving threads out of jump pad, we need to be able to step
2413 over internal breakpoints and such. */
2414 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2416 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2418 lwp
= get_thread_lwp (current_inferior
);
2423 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2424 || current_inferior
->last_resume_kind
== resume_stop
)
2426 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2427 enqueue_one_deferred_signal (lwp
, &wstat
);
2432 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2434 stabilizing_threads
= 0;
2436 current_inferior
= save_inferior
;
2441 = (struct thread_info
*) find_inferior (&all_threads
,
2442 stuck_in_jump_pad_callback
,
2444 if (thread_stuck
!= NULL
)
2445 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2446 lwpid_of (thread_stuck
));
2450 /* Wait for process, returns status. */
2453 linux_wait_1 (ptid_t ptid
,
2454 struct target_waitstatus
*ourstatus
, int target_options
)
2457 struct lwp_info
*event_child
;
2460 int step_over_finished
;
2461 int bp_explains_trap
;
2462 int maybe_internal_trap
;
2470 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2473 /* Translate generic target options into linux options. */
2475 if (target_options
& TARGET_WNOHANG
)
2479 bp_explains_trap
= 0;
2482 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2484 /* If we were only supposed to resume one thread, only wait for
2485 that thread - if it's still alive. If it died, however - which
2486 can happen if we're coming from the thread death case below -
2487 then we need to make sure we restart the other threads. We could
2488 pick a thread at random or restart all; restarting all is less
2491 && !ptid_equal (cont_thread
, null_ptid
)
2492 && !ptid_equal (cont_thread
, minus_one_ptid
))
2494 struct thread_info
*thread
;
2496 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2499 /* No stepping, no signal - unless one is pending already, of course. */
2502 struct thread_resume resume_info
;
2503 resume_info
.thread
= minus_one_ptid
;
2504 resume_info
.kind
= resume_continue
;
2505 resume_info
.sig
= 0;
2506 linux_resume (&resume_info
, 1);
2512 if (ptid_equal (step_over_bkpt
, null_ptid
))
2513 pid
= linux_wait_for_event (ptid
, &w
, options
);
2517 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2518 target_pid_to_str (step_over_bkpt
));
2519 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2524 gdb_assert (target_options
& TARGET_WNOHANG
);
2528 debug_printf ("linux_wait_1 ret = null_ptid, "
2529 "TARGET_WAITKIND_IGNORE\n");
2533 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2540 debug_printf ("linux_wait_1 ret = null_ptid, "
2541 "TARGET_WAITKIND_NO_RESUMED\n");
2545 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2549 event_child
= get_thread_lwp (current_inferior
);
2551 /* linux_wait_for_event only returns an exit status for the last
2552 child of a process. Report it. */
2553 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2557 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2558 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2562 debug_printf ("linux_wait_1 ret = %s, exited with "
2564 target_pid_to_str (ptid_of (current_inferior
)),
2571 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2572 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2576 debug_printf ("linux_wait_1 ret = %s, terminated with "
2578 target_pid_to_str (ptid_of (current_inferior
)),
2584 return ptid_of (current_inferior
);
2587 /* If this event was not handled before, and is not a SIGTRAP, we
2588 report it. SIGILL and SIGSEGV are also treated as traps in case
2589 a breakpoint is inserted at the current PC. If this target does
2590 not support internal breakpoints at all, we also report the
2591 SIGTRAP without further processing; it's of no concern to us. */
2593 = (supports_breakpoints ()
2594 && (WSTOPSIG (w
) == SIGTRAP
2595 || ((WSTOPSIG (w
) == SIGILL
2596 || WSTOPSIG (w
) == SIGSEGV
)
2597 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2599 if (maybe_internal_trap
)
2601 /* Handle anything that requires bookkeeping before deciding to
2602 report the event or continue waiting. */
2604 /* First check if we can explain the SIGTRAP with an internal
2605 breakpoint, or if we should possibly report the event to GDB.
2606 Do this before anything that may remove or insert a
2608 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2610 /* We have a SIGTRAP, possibly a step-over dance has just
2611 finished. If so, tweak the state machine accordingly,
2612 reinsert breakpoints and delete any reinsert (software
2613 single-step) breakpoints. */
2614 step_over_finished
= finish_step_over (event_child
);
2616 /* Now invoke the callbacks of any internal breakpoints there. */
2617 check_breakpoints (event_child
->stop_pc
);
2619 /* Handle tracepoint data collecting. This may overflow the
2620 trace buffer, and cause a tracing stop, removing
2622 trace_event
= handle_tracepoints (event_child
);
2624 if (bp_explains_trap
)
2626 /* If we stepped or ran into an internal breakpoint, we've
2627 already handled it. So next time we resume (from this
2628 PC), we should step over it. */
2630 debug_printf ("Hit a gdbserver breakpoint.\n");
2632 if (breakpoint_here (event_child
->stop_pc
))
2633 event_child
->need_step_over
= 1;
2638 /* We have some other signal, possibly a step-over dance was in
2639 progress, and it should be cancelled too. */
2640 step_over_finished
= finish_step_over (event_child
);
2643 /* We have all the data we need. Either report the event to GDB, or
2644 resume threads and keep waiting for more. */
2646 /* If we're collecting a fast tracepoint, finish the collection and
2647 move out of the jump pad before delivering a signal. See
2648 linux_stabilize_threads. */
2651 && WSTOPSIG (w
) != SIGTRAP
2652 && supports_fast_tracepoints ()
2653 && agent_loaded_p ())
2656 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2657 "to defer or adjust it.\n",
2658 WSTOPSIG (w
), lwpid_of (current_inferior
));
2660 /* Allow debugging the jump pad itself. */
2661 if (current_inferior
->last_resume_kind
!= resume_step
2662 && maybe_move_out_of_jump_pad (event_child
, &w
))
2664 enqueue_one_deferred_signal (event_child
, &w
);
2667 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2668 WSTOPSIG (w
), lwpid_of (current_inferior
));
2670 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2675 if (event_child
->collecting_fast_tracepoint
)
2678 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2679 "Check if we're already there.\n",
2680 lwpid_of (current_inferior
),
2681 event_child
->collecting_fast_tracepoint
);
2685 event_child
->collecting_fast_tracepoint
2686 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2688 if (event_child
->collecting_fast_tracepoint
!= 1)
2690 /* No longer need this breakpoint. */
2691 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2694 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2695 "stopping all threads momentarily.\n");
2697 /* Other running threads could hit this breakpoint.
2698 We don't handle moribund locations like GDB does,
2699 instead we always pause all threads when removing
2700 breakpoints, so that any step-over or
2701 decr_pc_after_break adjustment is always taken
2702 care of while the breakpoint is still
2704 stop_all_lwps (1, event_child
);
2705 cancel_breakpoints ();
2707 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2708 event_child
->exit_jump_pad_bkpt
= NULL
;
2710 unstop_all_lwps (1, event_child
);
2712 gdb_assert (event_child
->suspended
>= 0);
2716 if (event_child
->collecting_fast_tracepoint
== 0)
2719 debug_printf ("fast tracepoint finished "
2720 "collecting successfully.\n");
2722 /* We may have a deferred signal to report. */
2723 if (dequeue_one_deferred_signal (event_child
, &w
))
2726 debug_printf ("dequeued one signal.\n");
2731 debug_printf ("no deferred signals.\n");
2733 if (stabilizing_threads
)
2735 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2736 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2740 debug_printf ("linux_wait_1 ret = %s, stopped "
2741 "while stabilizing threads\n",
2742 target_pid_to_str (ptid_of (current_inferior
)));
2746 return ptid_of (current_inferior
);
2752 /* Check whether GDB would be interested in this event. */
2754 /* If GDB is not interested in this signal, don't stop other
2755 threads, and don't report it to GDB. Just resume the inferior
2756 right away. We do this for threading-related signals as well as
2757 any that GDB specifically requested we ignore. But never ignore
2758 SIGSTOP if we sent it ourselves, and do not ignore signals when
2759 stepping - they may require special handling to skip the signal
2761 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2764 && current_inferior
->last_resume_kind
!= resume_step
2766 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2767 (current_process ()->private->thread_db
!= NULL
2768 && (WSTOPSIG (w
) == __SIGRTMIN
2769 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2772 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2773 && !(WSTOPSIG (w
) == SIGSTOP
2774 && current_inferior
->last_resume_kind
== resume_stop
))))
2776 siginfo_t info
, *info_p
;
2779 debug_printf ("Ignored signal %d for LWP %ld.\n",
2780 WSTOPSIG (w
), lwpid_of (current_inferior
));
2782 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_inferior
),
2783 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2787 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2788 WSTOPSIG (w
), info_p
);
2792 /* Note that all addresses are always "out of the step range" when
2793 there's no range to begin with. */
2794 in_step_range
= lwp_in_step_range (event_child
);
2796 /* If GDB wanted this thread to single step, and the thread is out
2797 of the step range, we always want to report the SIGTRAP, and let
2798 GDB handle it. Watchpoints should always be reported. So should
2799 signals we can't explain. A SIGTRAP we can't explain could be a
2800 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2801 do, we're be able to handle GDB breakpoints on top of internal
2802 breakpoints, by handling the internal breakpoint and still
2803 reporting the event to GDB. If we don't, we're out of luck, GDB
2804 won't see the breakpoint hit. */
2805 report_to_gdb
= (!maybe_internal_trap
2806 || (current_inferior
->last_resume_kind
== resume_step
2808 || event_child
->stopped_by_watchpoint
2809 || (!step_over_finished
&& !in_step_range
2810 && !bp_explains_trap
&& !trace_event
)
2811 || (gdb_breakpoint_here (event_child
->stop_pc
)
2812 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2813 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2815 run_breakpoint_commands (event_child
->stop_pc
);
2817 /* We found no reason GDB would want us to stop. We either hit one
2818 of our own breakpoints, or finished an internal step GDB
2819 shouldn't know about. */
2824 if (bp_explains_trap
)
2825 debug_printf ("Hit a gdbserver breakpoint.\n");
2826 if (step_over_finished
)
2827 debug_printf ("Step-over finished.\n");
2829 debug_printf ("Tracepoint event.\n");
2830 if (lwp_in_step_range (event_child
))
2831 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2832 paddress (event_child
->stop_pc
),
2833 paddress (event_child
->step_range_start
),
2834 paddress (event_child
->step_range_end
));
2837 /* We're not reporting this breakpoint to GDB, so apply the
2838 decr_pc_after_break adjustment to the inferior's regcache
2841 if (the_low_target
.set_pc
!= NULL
)
2843 struct regcache
*regcache
2844 = get_thread_regcache (current_inferior
, 1);
2845 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2848 /* We may have finished stepping over a breakpoint. If so,
2849 we've stopped and suspended all LWPs momentarily except the
2850 stepping one. This is where we resume them all again. We're
2851 going to keep waiting, so use proceed, which handles stepping
2852 over the next breakpoint. */
2854 debug_printf ("proceeding all threads.\n");
2856 if (step_over_finished
)
2857 unsuspend_all_lwps (event_child
);
2859 proceed_all_lwps ();
2865 if (current_inferior
->last_resume_kind
== resume_step
)
2867 if (event_child
->step_range_start
== event_child
->step_range_end
)
2868 debug_printf ("GDB wanted to single-step, reporting event.\n");
2869 else if (!lwp_in_step_range (event_child
))
2870 debug_printf ("Out of step range, reporting event.\n");
2872 if (event_child
->stopped_by_watchpoint
)
2873 debug_printf ("Stopped by watchpoint.\n");
2874 if (gdb_breakpoint_here (event_child
->stop_pc
))
2875 debug_printf ("Stopped by GDB breakpoint.\n");
2877 debug_printf ("Hit a non-gdbserver trap event.\n");
2880 /* Alright, we're going to report a stop. */
2882 if (!non_stop
&& !stabilizing_threads
)
2884 /* In all-stop, stop all threads. */
2885 stop_all_lwps (0, NULL
);
2887 /* If we're not waiting for a specific LWP, choose an event LWP
2888 from among those that have had events. Giving equal priority
2889 to all LWPs that have had events helps prevent
2891 if (ptid_equal (ptid
, minus_one_ptid
))
2893 event_child
->status_pending_p
= 1;
2894 event_child
->status_pending
= w
;
2896 select_event_lwp (&event_child
);
2898 /* current_inferior and event_child must stay in sync. */
2899 current_inferior
= get_lwp_thread (event_child
);
2901 event_child
->status_pending_p
= 0;
2902 w
= event_child
->status_pending
;
2905 /* Now that we've selected our final event LWP, cancel any
2906 breakpoints in other LWPs that have hit a GDB breakpoint.
2907 See the comment in cancel_breakpoints_callback to find out
2909 find_inferior (&all_threads
, cancel_breakpoints_callback
, event_child
);
2911 /* If we were going a step-over, all other threads but the stepping one
2912 had been paused in start_step_over, with their suspend counts
2913 incremented. We don't want to do a full unstop/unpause, because we're
2914 in all-stop mode (so we want threads stopped), but we still need to
2915 unsuspend the other threads, to decrement their `suspended' count
2917 if (step_over_finished
)
2918 unsuspend_all_lwps (event_child
);
2920 /* Stabilize threads (move out of jump pads). */
2921 stabilize_threads ();
2925 /* If we just finished a step-over, then all threads had been
2926 momentarily paused. In all-stop, that's fine, we want
2927 threads stopped by now anyway. In non-stop, we need to
2928 re-resume threads that GDB wanted to be running. */
2929 if (step_over_finished
)
2930 unstop_all_lwps (1, event_child
);
2933 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2935 if (current_inferior
->last_resume_kind
== resume_stop
2936 && WSTOPSIG (w
) == SIGSTOP
)
2938 /* A thread that has been requested to stop by GDB with vCont;t,
2939 and it stopped cleanly, so report as SIG0. The use of
2940 SIGSTOP is an implementation detail. */
2941 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2943 else if (current_inferior
->last_resume_kind
== resume_stop
2944 && WSTOPSIG (w
) != SIGSTOP
)
2946 /* A thread that has been requested to stop by GDB with vCont;t,
2947 but, it stopped for other reasons. */
2948 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2952 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2955 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2959 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2960 target_pid_to_str (ptid_of (current_inferior
)),
2961 ourstatus
->kind
, ourstatus
->value
.sig
);
2965 return ptid_of (current_inferior
);
2968 /* Get rid of any pending event in the pipe. */
2970 async_file_flush (void)
2976 ret
= read (linux_event_pipe
[0], &buf
, 1);
2977 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2980 /* Put something in the pipe, so the event loop wakes up. */
2982 async_file_mark (void)
2986 async_file_flush ();
2989 ret
= write (linux_event_pipe
[1], "+", 1);
2990 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2992 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2993 be awakened anyway. */
2997 linux_wait (ptid_t ptid
,
2998 struct target_waitstatus
*ourstatus
, int target_options
)
3002 /* Flush the async file first. */
3003 if (target_is_async_p ())
3004 async_file_flush ();
3006 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3008 /* If at least one stop was reported, there may be more. A single
3009 SIGCHLD can signal more than one child stop. */
3010 if (target_is_async_p ()
3011 && (target_options
& TARGET_WNOHANG
) != 0
3012 && !ptid_equal (event_ptid
, null_ptid
))
3018 /* Send a signal to an LWP. */
3021 kill_lwp (unsigned long lwpid
, int signo
)
3023 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3024 fails, then we are not using nptl threads and we should be using kill. */
3028 static int tkill_failed
;
3035 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3036 if (errno
!= ENOSYS
)
3043 return kill (lwpid
, signo
);
3047 linux_stop_lwp (struct lwp_info
*lwp
)
3053 send_sigstop (struct lwp_info
*lwp
)
3057 pid
= lwpid_of (get_lwp_thread (lwp
));
3059 /* If we already have a pending stop signal for this process, don't
3061 if (lwp
->stop_expected
)
3064 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3070 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3072 lwp
->stop_expected
= 1;
3073 kill_lwp (pid
, SIGSTOP
);
3077 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3079 struct thread_info
*thread
= (struct thread_info
*) entry
;
3080 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3082 /* Ignore EXCEPT. */
3093 /* Increment the suspend count of an LWP, and stop it, if not stopped
3096 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3099 struct thread_info
*thread
= (struct thread_info
*) entry
;
3100 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3102 /* Ignore EXCEPT. */
3108 return send_sigstop_callback (entry
, except
);
3112 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3114 /* It's dead, really. */
3117 /* Store the exit status for later. */
3118 lwp
->status_pending_p
= 1;
3119 lwp
->status_pending
= wstat
;
3121 /* Prevent trying to stop it. */
3124 /* No further stops are expected from a dead lwp. */
3125 lwp
->stop_expected
= 0;
3128 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3131 wait_for_sigstop (void)
3133 struct thread_info
*saved_inferior
;
3138 saved_inferior
= current_inferior
;
3139 if (saved_inferior
!= NULL
)
3140 saved_tid
= saved_inferior
->entry
.id
;
3142 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3145 debug_printf ("wait_for_sigstop: pulling events\n");
3147 /* Passing NULL_PTID as filter indicates we want all events to be
3148 left pending. Eventually this returns when there are no
3149 unwaited-for children left. */
3150 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3152 gdb_assert (ret
== -1);
3154 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3155 current_inferior
= saved_inferior
;
3159 debug_printf ("Previously current thread died.\n");
3163 /* We can't change the current inferior behind GDB's back,
3164 otherwise, a subsequent command may apply to the wrong
3166 current_inferior
= NULL
;
3170 /* Set a valid thread as current. */
3171 set_desired_inferior (0);
3176 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3177 move it out, because we need to report the stop event to GDB. For
3178 example, if the user puts a breakpoint in the jump pad, it's
3179 because she wants to debug it. */
3182 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3184 struct thread_info
*thread
= (struct thread_info
*) entry
;
3185 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3187 gdb_assert (lwp
->suspended
== 0);
3188 gdb_assert (lwp
->stopped
);
3190 /* Allow debugging the jump pad, gdb_collect, etc.. */
3191 return (supports_fast_tracepoints ()
3192 && agent_loaded_p ()
3193 && (gdb_breakpoint_here (lwp
->stop_pc
)
3194 || lwp
->stopped_by_watchpoint
3195 || thread
->last_resume_kind
== resume_step
)
3196 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3200 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3202 struct thread_info
*thread
= (struct thread_info
*) entry
;
3203 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3206 gdb_assert (lwp
->suspended
== 0);
3207 gdb_assert (lwp
->stopped
);
3209 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3211 /* Allow debugging the jump pad, gdb_collect, etc. */
3212 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3213 && !lwp
->stopped_by_watchpoint
3214 && thread
->last_resume_kind
!= resume_step
3215 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3218 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3223 lwp
->status_pending_p
= 0;
3224 enqueue_one_deferred_signal (lwp
, wstat
);
3227 debug_printf ("Signal %d for LWP %ld deferred "
3229 WSTOPSIG (*wstat
), lwpid_of (thread
));
3232 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3239 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3241 struct thread_info
*thread
= (struct thread_info
*) entry
;
3242 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3251 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3252 If SUSPEND, then also increase the suspend count of every LWP,
3256 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3258 /* Should not be called recursively. */
3259 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3264 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3265 suspend
? "stop-and-suspend" : "stop",
3267 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3271 stopping_threads
= (suspend
3272 ? STOPPING_AND_SUSPENDING_THREADS
3273 : STOPPING_THREADS
);
3276 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3278 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3279 wait_for_sigstop ();
3280 stopping_threads
= NOT_STOPPING_THREADS
;
3284 debug_printf ("stop_all_lwps done, setting stopping_threads "
3285 "back to !stopping\n");
3290 /* Resume execution of the inferior process.
3291 If STEP is nonzero, single-step it.
3292 If SIGNAL is nonzero, give it that signal. */
3295 linux_resume_one_lwp (struct lwp_info
*lwp
,
3296 int step
, int signal
, siginfo_t
*info
)
3298 struct thread_info
*thread
= get_lwp_thread (lwp
);
3299 struct thread_info
*saved_inferior
;
3300 int fast_tp_collecting
;
3302 if (lwp
->stopped
== 0)
3305 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3307 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3309 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3310 user used the "jump" command, or "set $pc = foo"). */
3311 if (lwp
->stop_pc
!= get_pc (lwp
))
3313 /* Collecting 'while-stepping' actions doesn't make sense
3315 release_while_stepping_state_list (thread
);
3318 /* If we have pending signals or status, and a new signal, enqueue the
3319 signal. Also enqueue the signal if we are waiting to reinsert a
3320 breakpoint; it will be picked up again below. */
3322 && (lwp
->status_pending_p
3323 || lwp
->pending_signals
!= NULL
3324 || lwp
->bp_reinsert
!= 0
3325 || fast_tp_collecting
))
3327 struct pending_signals
*p_sig
;
3328 p_sig
= xmalloc (sizeof (*p_sig
));
3329 p_sig
->prev
= lwp
->pending_signals
;
3330 p_sig
->signal
= signal
;
3332 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3334 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3335 lwp
->pending_signals
= p_sig
;
3338 if (lwp
->status_pending_p
)
3341 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3342 " has pending status\n",
3343 lwpid_of (thread
), step
? "step" : "continue", signal
,
3344 lwp
->stop_expected
? "expected" : "not expected");
3348 saved_inferior
= current_inferior
;
3349 current_inferior
= thread
;
3352 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3353 lwpid_of (thread
), step
? "step" : "continue", signal
,
3354 lwp
->stop_expected
? "expected" : "not expected");
3356 /* This bit needs some thinking about. If we get a signal that
3357 we must report while a single-step reinsert is still pending,
3358 we often end up resuming the thread. It might be better to
3359 (ew) allow a stack of pending events; then we could be sure that
3360 the reinsert happened right away and not lose any signals.
3362 Making this stack would also shrink the window in which breakpoints are
3363 uninserted (see comment in linux_wait_for_lwp) but not enough for
3364 complete correctness, so it won't solve that problem. It may be
3365 worthwhile just to solve this one, however. */
3366 if (lwp
->bp_reinsert
!= 0)
3369 debug_printf (" pending reinsert at 0x%s\n",
3370 paddress (lwp
->bp_reinsert
));
3372 if (can_hardware_single_step ())
3374 if (fast_tp_collecting
== 0)
3377 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3379 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3386 /* Postpone any pending signal. It was enqueued above. */
3390 if (fast_tp_collecting
== 1)
3393 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3394 " (exit-jump-pad-bkpt)\n",
3397 /* Postpone any pending signal. It was enqueued above. */
3400 else if (fast_tp_collecting
== 2)
3403 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3404 " single-stepping\n",
3407 if (can_hardware_single_step ())
3410 fatal ("moving out of jump pad single-stepping"
3411 " not implemented on this target");
3413 /* Postpone any pending signal. It was enqueued above. */
3417 /* If we have while-stepping actions in this thread set it stepping.
3418 If we have a signal to deliver, it may or may not be set to
3419 SIG_IGN, we don't know. Assume so, and allow collecting
3420 while-stepping into a signal handler. A possible smart thing to
3421 do would be to set an internal breakpoint at the signal return
3422 address, continue, and carry on catching this while-stepping
3423 action only when that breakpoint is hit. A future
3425 if (thread
->while_stepping
!= NULL
3426 && can_hardware_single_step ())
3429 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3434 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3436 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3437 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3438 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3441 /* If we have pending signals, consume one unless we are trying to
3442 reinsert a breakpoint or we're trying to finish a fast tracepoint
3444 if (lwp
->pending_signals
!= NULL
3445 && lwp
->bp_reinsert
== 0
3446 && fast_tp_collecting
== 0)
3448 struct pending_signals
**p_sig
;
3450 p_sig
= &lwp
->pending_signals
;
3451 while ((*p_sig
)->prev
!= NULL
)
3452 p_sig
= &(*p_sig
)->prev
;
3454 signal
= (*p_sig
)->signal
;
3455 if ((*p_sig
)->info
.si_signo
!= 0)
3456 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3463 if (the_low_target
.prepare_to_resume
!= NULL
)
3464 the_low_target
.prepare_to_resume (lwp
);
3466 regcache_invalidate_thread (thread
);
3469 lwp
->stopped_by_watchpoint
= 0;
3470 lwp
->stepping
= step
;
3471 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3472 (PTRACE_TYPE_ARG3
) 0,
3473 /* Coerce to a uintptr_t first to avoid potential gcc warning
3474 of coercing an 8 byte integer to a 4 byte pointer. */
3475 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3477 current_inferior
= saved_inferior
;
3480 /* ESRCH from ptrace either means that the thread was already
3481 running (an error) or that it is gone (a race condition). If
3482 it's gone, we will get a notification the next time we wait,
3483 so we can ignore the error. We could differentiate these
3484 two, but it's tricky without waiting; the thread still exists
3485 as a zombie, so sending it signal 0 would succeed. So just
3490 perror_with_name ("ptrace");
3494 struct thread_resume_array
3496 struct thread_resume
*resume
;
3500 /* This function is called once per thread via find_inferior.
3501 ARG is a pointer to a thread_resume_array struct.
3502 We look up the thread specified by ENTRY in ARG, and mark the thread
3503 with a pointer to the appropriate resume request.
3505 This algorithm is O(threads * resume elements), but resume elements
3506 is small (and will remain small at least until GDB supports thread
3510 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3512 struct thread_info
*thread
= (struct thread_info
*) entry
;
3513 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3515 struct thread_resume_array
*r
;
3519 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3521 ptid_t ptid
= r
->resume
[ndx
].thread
;
3522 if (ptid_equal (ptid
, minus_one_ptid
)
3523 || ptid_equal (ptid
, entry
->id
)
3524 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3526 || (ptid_get_pid (ptid
) == pid_of (thread
)
3527 && (ptid_is_pid (ptid
)
3528 || ptid_get_lwp (ptid
) == -1)))
3530 if (r
->resume
[ndx
].kind
== resume_stop
3531 && thread
->last_resume_kind
== resume_stop
)
3534 debug_printf ("already %s LWP %ld at GDB's request\n",
3535 (thread
->last_status
.kind
3536 == TARGET_WAITKIND_STOPPED
)
3544 lwp
->resume
= &r
->resume
[ndx
];
3545 thread
->last_resume_kind
= lwp
->resume
->kind
;
3547 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3548 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3550 /* If we had a deferred signal to report, dequeue one now.
3551 This can happen if LWP gets more than one signal while
3552 trying to get out of a jump pad. */
3554 && !lwp
->status_pending_p
3555 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3557 lwp
->status_pending_p
= 1;
3560 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3561 "leaving status pending.\n",
3562 WSTOPSIG (lwp
->status_pending
),
3570 /* No resume action for this thread. */
3576 /* find_inferior callback for linux_resume.
3577 Set *FLAG_P if this lwp has an interesting status pending. */
3580 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3582 struct thread_info
*thread
= (struct thread_info
*) entry
;
3583 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3585 /* LWPs which will not be resumed are not interesting, because
3586 we might not wait for them next time through linux_wait. */
3587 if (lwp
->resume
== NULL
)
3590 if (lwp
->status_pending_p
)
3591 * (int *) flag_p
= 1;
3596 /* Return 1 if this lwp that GDB wants running is stopped at an
3597 internal breakpoint that we need to step over. It assumes that any
3598 required STOP_PC adjustment has already been propagated to the
3599 inferior's regcache. */
3602 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3604 struct thread_info
*thread
= (struct thread_info
*) entry
;
3605 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3606 struct thread_info
*saved_inferior
;
3609 /* LWPs which will not be resumed are not interesting, because we
3610 might not wait for them next time through linux_wait. */
3615 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3620 if (thread
->last_resume_kind
== resume_stop
)
3623 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3629 gdb_assert (lwp
->suspended
>= 0);
3634 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3639 if (!lwp
->need_step_over
)
3642 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3645 if (lwp
->status_pending_p
)
3648 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3654 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3658 /* If the PC has changed since we stopped, then don't do anything,
3659 and let the breakpoint/tracepoint be hit. This happens if, for
3660 instance, GDB handled the decr_pc_after_break subtraction itself,
3661 GDB is OOL stepping this thread, or the user has issued a "jump"
3662 command, or poked thread's registers herself. */
3663 if (pc
!= lwp
->stop_pc
)
3666 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3667 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3669 paddress (lwp
->stop_pc
), paddress (pc
));
3671 lwp
->need_step_over
= 0;
3675 saved_inferior
= current_inferior
;
3676 current_inferior
= thread
;
3678 /* We can only step over breakpoints we know about. */
3679 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3681 /* Don't step over a breakpoint that GDB expects to hit
3682 though. If the condition is being evaluated on the target's side
3683 and it evaluate to false, step over this breakpoint as well. */
3684 if (gdb_breakpoint_here (pc
)
3685 && gdb_condition_true_at_breakpoint (pc
)
3686 && gdb_no_commands_at_breakpoint (pc
))
3689 debug_printf ("Need step over [LWP %ld]? yes, but found"
3690 " GDB breakpoint at 0x%s; skipping step over\n",
3691 lwpid_of (thread
), paddress (pc
));
3693 current_inferior
= saved_inferior
;
3699 debug_printf ("Need step over [LWP %ld]? yes, "
3700 "found breakpoint at 0x%s\n",
3701 lwpid_of (thread
), paddress (pc
));
3703 /* We've found an lwp that needs stepping over --- return 1 so
3704 that find_inferior stops looking. */
3705 current_inferior
= saved_inferior
;
3707 /* If the step over is cancelled, this is set again. */
3708 lwp
->need_step_over
= 0;
3713 current_inferior
= saved_inferior
;
3716 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3718 lwpid_of (thread
), paddress (pc
));
3723 /* Start a step-over operation on LWP. When LWP stopped at a
3724 breakpoint, to make progress, we need to remove the breakpoint out
3725 of the way. If we let other threads run while we do that, they may
3726 pass by the breakpoint location and miss hitting it. To avoid
3727 that, a step-over momentarily stops all threads while LWP is
3728 single-stepped while the breakpoint is temporarily uninserted from
3729 the inferior. When the single-step finishes, we reinsert the
3730 breakpoint, and let all threads that are supposed to be running,
3733 On targets that don't support hardware single-step, we don't
3734 currently support full software single-stepping. Instead, we only
3735 support stepping over the thread event breakpoint, by asking the
3736 low target where to place a reinsert breakpoint. Since this
3737 routine assumes the breakpoint being stepped over is a thread event
3738 breakpoint, it usually assumes the return address of the current
3739 function is a good enough place to set the reinsert breakpoint. */
3742 start_step_over (struct lwp_info
*lwp
)
3744 struct thread_info
*thread
= get_lwp_thread (lwp
);
3745 struct thread_info
*saved_inferior
;
3750 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3753 stop_all_lwps (1, lwp
);
3754 gdb_assert (lwp
->suspended
== 0);
3757 debug_printf ("Done stopping all threads for step-over.\n");
3759 /* Note, we should always reach here with an already adjusted PC,
3760 either by GDB (if we're resuming due to GDB's request), or by our
3761 caller, if we just finished handling an internal breakpoint GDB
3762 shouldn't care about. */
3765 saved_inferior
= current_inferior
;
3766 current_inferior
= thread
;
3768 lwp
->bp_reinsert
= pc
;
3769 uninsert_breakpoints_at (pc
);
3770 uninsert_fast_tracepoint_jumps_at (pc
);
3772 if (can_hardware_single_step ())
3778 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3779 set_reinsert_breakpoint (raddr
);
3783 current_inferior
= saved_inferior
;
3785 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3787 /* Require next event from this LWP. */
3788 step_over_bkpt
= thread
->entry
.id
;
3792 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3793 start_step_over, if still there, and delete any reinsert
3794 breakpoints we've set, on non hardware single-step targets. */
3797 finish_step_over (struct lwp_info
*lwp
)
3799 if (lwp
->bp_reinsert
!= 0)
3802 debug_printf ("Finished step over.\n");
3804 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3805 may be no breakpoint to reinsert there by now. */
3806 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3807 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3809 lwp
->bp_reinsert
= 0;
3811 /* Delete any software-single-step reinsert breakpoints. No
3812 longer needed. We don't have to worry about other threads
3813 hitting this trap, and later not being able to explain it,
3814 because we were stepping over a breakpoint, and we hold all
3815 threads but LWP stopped while doing that. */
3816 if (!can_hardware_single_step ())
3817 delete_reinsert_breakpoints ();
3819 step_over_bkpt
= null_ptid
;
3826 /* This function is called once per thread. We check the thread's resume
3827 request, which will tell us whether to resume, step, or leave the thread
3828 stopped; and what signal, if any, it should be sent.
3830 For threads which we aren't explicitly told otherwise, we preserve
3831 the stepping flag; this is used for stepping over gdbserver-placed
3834 If pending_flags was set in any thread, we queue any needed
3835 signals, since we won't actually resume. We already have a pending
3836 event to report, so we don't need to preserve any step requests;
3837 they should be re-issued if necessary. */
3840 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3842 struct thread_info
*thread
= (struct thread_info
*) entry
;
3843 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3845 int leave_all_stopped
= * (int *) arg
;
3848 if (lwp
->resume
== NULL
)
3851 if (lwp
->resume
->kind
== resume_stop
)
3854 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3859 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3861 /* Stop the thread, and wait for the event asynchronously,
3862 through the event loop. */
3868 debug_printf ("already stopped LWP %ld\n",
3871 /* The LWP may have been stopped in an internal event that
3872 was not meant to be notified back to GDB (e.g., gdbserver
3873 breakpoint), so we should be reporting a stop event in
3876 /* If the thread already has a pending SIGSTOP, this is a
3877 no-op. Otherwise, something later will presumably resume
3878 the thread and this will cause it to cancel any pending
3879 operation, due to last_resume_kind == resume_stop. If
3880 the thread already has a pending status to report, we
3881 will still report it the next time we wait - see
3882 status_pending_p_callback. */
3884 /* If we already have a pending signal to report, then
3885 there's no need to queue a SIGSTOP, as this means we're
3886 midway through moving the LWP out of the jumppad, and we
3887 will report the pending signal as soon as that is
3889 if (lwp
->pending_signals_to_report
== NULL
)
3893 /* For stop requests, we're done. */
3895 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3899 /* If this thread which is about to be resumed has a pending status,
3900 then don't resume any threads - we can just report the pending
3901 status. Make sure to queue any signals that would otherwise be
3902 sent. In all-stop mode, we do this decision based on if *any*
3903 thread has a pending status. If there's a thread that needs the
3904 step-over-breakpoint dance, then don't resume any other thread
3905 but that particular one. */
3906 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3911 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3913 step
= (lwp
->resume
->kind
== resume_step
);
3914 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3919 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3921 /* If we have a new signal, enqueue the signal. */
3922 if (lwp
->resume
->sig
!= 0)
3924 struct pending_signals
*p_sig
;
3925 p_sig
= xmalloc (sizeof (*p_sig
));
3926 p_sig
->prev
= lwp
->pending_signals
;
3927 p_sig
->signal
= lwp
->resume
->sig
;
3928 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3930 /* If this is the same signal we were previously stopped by,
3931 make sure to queue its siginfo. We can ignore the return
3932 value of ptrace; if it fails, we'll skip
3933 PTRACE_SETSIGINFO. */
3934 if (WIFSTOPPED (lwp
->last_status
)
3935 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3936 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3939 lwp
->pending_signals
= p_sig
;
3943 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3949 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3951 struct thread_resume_array array
= { resume_info
, n
};
3952 struct thread_info
*need_step_over
= NULL
;
3954 int leave_all_stopped
;
3959 debug_printf ("linux_resume:\n");
3962 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3964 /* If there is a thread which would otherwise be resumed, which has
3965 a pending status, then don't resume any threads - we can just
3966 report the pending status. Make sure to queue any signals that
3967 would otherwise be sent. In non-stop mode, we'll apply this
3968 logic to each thread individually. We consume all pending events
3969 before considering to start a step-over (in all-stop). */
3972 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3974 /* If there is a thread which would otherwise be resumed, which is
3975 stopped at a breakpoint that needs stepping over, then don't
3976 resume any threads - have it step over the breakpoint with all
3977 other threads stopped, then resume all threads again. Make sure
3978 to queue any signals that would otherwise be delivered or
3980 if (!any_pending
&& supports_breakpoints ())
3982 = (struct thread_info
*) find_inferior (&all_threads
,
3983 need_step_over_p
, NULL
);
3985 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3989 if (need_step_over
!= NULL
)
3990 debug_printf ("Not resuming all, need step over\n");
3991 else if (any_pending
)
3992 debug_printf ("Not resuming, all-stop and found "
3993 "an LWP with pending status\n");
3995 debug_printf ("Resuming, no pending status or step over needed\n");
3998 /* Even if we're leaving threads stopped, queue all signals we'd
3999 otherwise deliver. */
4000 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4003 start_step_over (get_thread_lwp (need_step_over
));
4007 debug_printf ("linux_resume done\n");
4012 /* This function is called once per thread. We check the thread's
4013 last resume request, which will tell us whether to resume, step, or
4014 leave the thread stopped. Any signal the client requested to be
4015 delivered has already been enqueued at this point.
4017 If any thread that GDB wants running is stopped at an internal
4018 breakpoint that needs stepping over, we start a step-over operation
4019 on that particular thread, and leave all others stopped. */
4022 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4024 struct thread_info
*thread
= (struct thread_info
*) entry
;
4025 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4032 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4037 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4041 if (thread
->last_resume_kind
== resume_stop
4042 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4045 debug_printf (" client wants LWP to remain %ld stopped\n",
4050 if (lwp
->status_pending_p
)
4053 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4058 gdb_assert (lwp
->suspended
>= 0);
4063 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4067 if (thread
->last_resume_kind
== resume_stop
4068 && lwp
->pending_signals_to_report
== NULL
4069 && lwp
->collecting_fast_tracepoint
== 0)
4071 /* We haven't reported this LWP as stopped yet (otherwise, the
4072 last_status.kind check above would catch it, and we wouldn't
4073 reach here. This LWP may have been momentarily paused by a
4074 stop_all_lwps call while handling for example, another LWP's
4075 step-over. In that case, the pending expected SIGSTOP signal
4076 that was queued at vCont;t handling time will have already
4077 been consumed by wait_for_sigstop, and so we need to requeue
4078 another one here. Note that if the LWP already has a SIGSTOP
4079 pending, this is a no-op. */
4082 debug_printf ("Client wants LWP %ld to stop. "
4083 "Making sure it has a SIGSTOP pending\n",
4089 step
= thread
->last_resume_kind
== resume_step
;
4090 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4095 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4097 struct thread_info
*thread
= (struct thread_info
*) entry
;
4098 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4104 gdb_assert (lwp
->suspended
>= 0);
4106 return proceed_one_lwp (entry
, except
);
4109 /* When we finish a step-over, set threads running again. If there's
4110 another thread that may need a step-over, now's the time to start
4111 it. Eventually, we'll move all threads past their breakpoints. */
4114 proceed_all_lwps (void)
4116 struct thread_info
*need_step_over
;
4118 /* If there is a thread which would otherwise be resumed, which is
4119 stopped at a breakpoint that needs stepping over, then don't
4120 resume any threads - have it step over the breakpoint with all
4121 other threads stopped, then resume all threads again. */
4123 if (supports_breakpoints ())
4126 = (struct thread_info
*) find_inferior (&all_threads
,
4127 need_step_over_p
, NULL
);
4129 if (need_step_over
!= NULL
)
4132 debug_printf ("proceed_all_lwps: found "
4133 "thread %ld needing a step-over\n",
4134 lwpid_of (need_step_over
));
4136 start_step_over (get_thread_lwp (need_step_over
));
4142 debug_printf ("Proceeding, no step-over needed\n");
4144 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4147 /* Stopped LWPs that the client wanted to be running, that don't have
4148 pending statuses, are set to run again, except for EXCEPT, if not
4149 NULL. This undoes a stop_all_lwps call. */
4152 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4158 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4159 lwpid_of (get_lwp_thread (except
)));
4161 debug_printf ("unstopping all lwps\n");
4165 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4167 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4171 debug_printf ("unstop_all_lwps done\n");
4177 #ifdef HAVE_LINUX_REGSETS
4179 #define use_linux_regsets 1
4181 /* Returns true if REGSET has been disabled. */
4184 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4186 return (info
->disabled_regsets
!= NULL
4187 && info
->disabled_regsets
[regset
- info
->regsets
]);
4190 /* Disable REGSET. */
4193 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4197 dr_offset
= regset
- info
->regsets
;
4198 if (info
->disabled_regsets
== NULL
)
4199 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4200 info
->disabled_regsets
[dr_offset
] = 1;
4204 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4205 struct regcache
*regcache
)
4207 struct regset_info
*regset
;
4208 int saw_general_regs
= 0;
4212 regset
= regsets_info
->regsets
;
4214 pid
= lwpid_of (current_inferior
);
4215 while (regset
->size
>= 0)
4220 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4226 buf
= xmalloc (regset
->size
);
4228 nt_type
= regset
->nt_type
;
4232 iov
.iov_len
= regset
->size
;
4233 data
= (void *) &iov
;
4239 res
= ptrace (regset
->get_request
, pid
,
4240 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4242 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4248 /* If we get EIO on a regset, do not try it again for
4249 this process mode. */
4250 disable_regset (regsets_info
, regset
);
4257 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4262 else if (regset
->type
== GENERAL_REGS
)
4263 saw_general_regs
= 1;
4264 regset
->store_function (regcache
, buf
);
4268 if (saw_general_regs
)
4275 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4276 struct regcache
*regcache
)
4278 struct regset_info
*regset
;
4279 int saw_general_regs
= 0;
4283 regset
= regsets_info
->regsets
;
4285 pid
= lwpid_of (current_inferior
);
4286 while (regset
->size
>= 0)
4291 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4297 buf
= xmalloc (regset
->size
);
4299 /* First fill the buffer with the current register set contents,
4300 in case there are any items in the kernel's regset that are
4301 not in gdbserver's regcache. */
4303 nt_type
= regset
->nt_type
;
4307 iov
.iov_len
= regset
->size
;
4308 data
= (void *) &iov
;
4314 res
= ptrace (regset
->get_request
, pid
,
4315 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4317 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4322 /* Then overlay our cached registers on that. */
4323 regset
->fill_function (regcache
, buf
);
4325 /* Only now do we write the register set. */
4327 res
= ptrace (regset
->set_request
, pid
,
4328 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4330 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4338 /* If we get EIO on a regset, do not try it again for
4339 this process mode. */
4340 disable_regset (regsets_info
, regset
);
4344 else if (errno
== ESRCH
)
4346 /* At this point, ESRCH should mean the process is
4347 already gone, in which case we simply ignore attempts
4348 to change its registers. See also the related
4349 comment in linux_resume_one_lwp. */
4355 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4358 else if (regset
->type
== GENERAL_REGS
)
4359 saw_general_regs
= 1;
4363 if (saw_general_regs
)
4369 #else /* !HAVE_LINUX_REGSETS */
4371 #define use_linux_regsets 0
4372 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4373 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4377 /* Return 1 if register REGNO is supported by one of the regset ptrace
4378 calls or 0 if it has to be transferred individually. */
4381 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4383 unsigned char mask
= 1 << (regno
% 8);
4384 size_t index
= regno
/ 8;
4386 return (use_linux_regsets
4387 && (regs_info
->regset_bitmap
== NULL
4388 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4391 #ifdef HAVE_LINUX_USRREGS
4394 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4398 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4399 error ("Invalid register number %d.", regnum
);
4401 addr
= usrregs
->regmap
[regnum
];
4406 /* Fetch one register. */
4408 fetch_register (const struct usrregs_info
*usrregs
,
4409 struct regcache
*regcache
, int regno
)
4416 if (regno
>= usrregs
->num_regs
)
4418 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4421 regaddr
= register_addr (usrregs
, regno
);
4425 size
= ((register_size (regcache
->tdesc
, regno
)
4426 + sizeof (PTRACE_XFER_TYPE
) - 1)
4427 & -sizeof (PTRACE_XFER_TYPE
));
4428 buf
= alloca (size
);
4430 pid
= lwpid_of (current_inferior
);
4431 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4434 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4435 ptrace (PTRACE_PEEKUSER
, pid
,
4436 /* Coerce to a uintptr_t first to avoid potential gcc warning
4437 of coercing an 8 byte integer to a 4 byte pointer. */
4438 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4439 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4441 error ("reading register %d: %s", regno
, strerror (errno
));
4444 if (the_low_target
.supply_ptrace_register
)
4445 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4447 supply_register (regcache
, regno
, buf
);
4450 /* Store one register. */
4452 store_register (const struct usrregs_info
*usrregs
,
4453 struct regcache
*regcache
, int regno
)
4460 if (regno
>= usrregs
->num_regs
)
4462 if ((*the_low_target
.cannot_store_register
) (regno
))
4465 regaddr
= register_addr (usrregs
, regno
);
4469 size
= ((register_size (regcache
->tdesc
, regno
)
4470 + sizeof (PTRACE_XFER_TYPE
) - 1)
4471 & -sizeof (PTRACE_XFER_TYPE
));
4472 buf
= alloca (size
);
4473 memset (buf
, 0, size
);
4475 if (the_low_target
.collect_ptrace_register
)
4476 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4478 collect_register (regcache
, regno
, buf
);
4480 pid
= lwpid_of (current_inferior
);
4481 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4484 ptrace (PTRACE_POKEUSER
, pid
,
4485 /* Coerce to a uintptr_t first to avoid potential gcc warning
4486 about coercing an 8 byte integer to a 4 byte pointer. */
4487 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4488 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4491 /* At this point, ESRCH should mean the process is
4492 already gone, in which case we simply ignore attempts
4493 to change its registers. See also the related
4494 comment in linux_resume_one_lwp. */
4498 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4499 error ("writing register %d: %s", regno
, strerror (errno
));
4501 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4505 /* Fetch all registers, or just one, from the child process.
4506 If REGNO is -1, do this for all registers, skipping any that are
4507 assumed to have been retrieved by regsets_fetch_inferior_registers,
4508 unless ALL is non-zero.
4509 Otherwise, REGNO specifies which register (so we can save time). */
4511 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4512 struct regcache
*regcache
, int regno
, int all
)
4514 struct usrregs_info
*usr
= regs_info
->usrregs
;
4518 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4519 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4520 fetch_register (usr
, regcache
, regno
);
4523 fetch_register (usr
, regcache
, regno
);
4526 /* Store our register values back into the inferior.
4527 If REGNO is -1, do this for all registers, skipping any that are
4528 assumed to have been saved by regsets_store_inferior_registers,
4529 unless ALL is non-zero.
4530 Otherwise, REGNO specifies which register (so we can save time). */
4532 usr_store_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 store_register (usr
, regcache
, regno
);
4544 store_register (usr
, regcache
, regno
);
4547 #else /* !HAVE_LINUX_USRREGS */
4549 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4550 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4556 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4560 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4564 if (the_low_target
.fetch_register
!= NULL
4565 && regs_info
->usrregs
!= NULL
)
4566 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4567 (*the_low_target
.fetch_register
) (regcache
, regno
);
4569 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4570 if (regs_info
->usrregs
!= NULL
)
4571 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4575 if (the_low_target
.fetch_register
!= NULL
4576 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4579 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4581 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4583 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4584 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4589 linux_store_registers (struct regcache
*regcache
, int regno
)
4593 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4597 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4599 if (regs_info
->usrregs
!= NULL
)
4600 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4604 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4606 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4608 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4609 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4614 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4615 to debugger memory starting at MYADDR. */
4618 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4620 int pid
= lwpid_of (current_inferior
);
4621 register PTRACE_XFER_TYPE
*buffer
;
4622 register CORE_ADDR addr
;
4629 /* Try using /proc. Don't bother for one word. */
4630 if (len
>= 3 * sizeof (long))
4634 /* We could keep this file open and cache it - possibly one per
4635 thread. That requires some juggling, but is even faster. */
4636 sprintf (filename
, "/proc/%d/mem", pid
);
4637 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4641 /* If pread64 is available, use it. It's faster if the kernel
4642 supports it (only one syscall), and it's 64-bit safe even on
4643 32-bit platforms (for instance, SPARC debugging a SPARC64
4646 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4649 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4650 bytes
= read (fd
, myaddr
, len
);
4657 /* Some data was read, we'll try to get the rest with ptrace. */
4667 /* Round starting address down to longword boundary. */
4668 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4669 /* Round ending address up; get number of longwords that makes. */
4670 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4671 / sizeof (PTRACE_XFER_TYPE
));
4672 /* Allocate buffer of that many longwords. */
4673 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4675 /* Read all the longwords */
4677 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4679 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4680 about coercing an 8 byte integer to a 4 byte pointer. */
4681 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4682 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4683 (PTRACE_TYPE_ARG4
) 0);
4689 /* Copy appropriate bytes out of the buffer. */
4692 i
*= sizeof (PTRACE_XFER_TYPE
);
4693 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4695 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4702 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4703 memory at MEMADDR. On failure (cannot write to the inferior)
4704 returns the value of errno. Always succeeds if LEN is zero. */
4707 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4710 /* Round starting address down to longword boundary. */
4711 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4712 /* Round ending address up; get number of longwords that makes. */
4714 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4715 / sizeof (PTRACE_XFER_TYPE
);
4717 /* Allocate buffer of that many longwords. */
4718 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4719 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4721 int pid
= lwpid_of (current_inferior
);
4725 /* Zero length write always succeeds. */
4731 /* Dump up to four bytes. */
4732 unsigned int val
= * (unsigned int *) myaddr
;
4738 val
= val
& 0xffffff;
4739 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4740 val
, (long)memaddr
);
4743 /* Fill start and end extra bytes of buffer with existing memory data. */
4746 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4747 about coercing an 8 byte integer to a 4 byte pointer. */
4748 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4749 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4750 (PTRACE_TYPE_ARG4
) 0);
4758 = ptrace (PTRACE_PEEKTEXT
, pid
,
4759 /* Coerce to a uintptr_t first to avoid potential gcc warning
4760 about coercing an 8 byte integer to a 4 byte pointer. */
4761 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4762 * sizeof (PTRACE_XFER_TYPE
)),
4763 (PTRACE_TYPE_ARG4
) 0);
4768 /* Copy data to be written over corresponding part of buffer. */
4770 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4773 /* Write the entire buffer. */
4775 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4778 ptrace (PTRACE_POKETEXT
, pid
,
4779 /* Coerce to a uintptr_t first to avoid potential gcc warning
4780 about coercing an 8 byte integer to a 4 byte pointer. */
4781 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4782 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4791 linux_look_up_symbols (void)
4793 #ifdef USE_THREAD_DB
4794 struct process_info
*proc
= current_process ();
4796 if (proc
->private->thread_db
!= NULL
)
4799 /* If the kernel supports tracing clones, then we don't need to
4800 use the magic thread event breakpoint to learn about
4802 thread_db_init (!linux_supports_traceclone ());
4807 linux_request_interrupt (void)
4809 extern unsigned long signal_pid
;
4811 if (!ptid_equal (cont_thread
, null_ptid
)
4812 && !ptid_equal (cont_thread
, minus_one_ptid
))
4816 lwpid
= lwpid_of (current_inferior
);
4817 kill_lwp (lwpid
, SIGINT
);
4820 kill_lwp (signal_pid
, SIGINT
);
4823 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4824 to debugger memory starting at MYADDR. */
4827 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4829 char filename
[PATH_MAX
];
4831 int pid
= lwpid_of (current_inferior
);
4833 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4835 fd
= open (filename
, O_RDONLY
);
4839 if (offset
!= (CORE_ADDR
) 0
4840 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4843 n
= read (fd
, myaddr
, len
);
4850 /* These breakpoint and watchpoint related wrapper functions simply
4851 pass on the function call if the target has registered a
4852 corresponding function. */
4855 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4857 if (the_low_target
.insert_point
!= NULL
)
4858 return the_low_target
.insert_point (type
, addr
, len
);
4860 /* Unsupported (see target.h). */
4865 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4867 if (the_low_target
.remove_point
!= NULL
)
4868 return the_low_target
.remove_point (type
, addr
, len
);
4870 /* Unsupported (see target.h). */
4875 linux_stopped_by_watchpoint (void)
4877 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4879 return lwp
->stopped_by_watchpoint
;
4883 linux_stopped_data_address (void)
4885 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4887 return lwp
->stopped_data_address
;
4890 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4891 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4892 && defined(PT_TEXT_END_ADDR)
4894 /* This is only used for targets that define PT_TEXT_ADDR,
4895 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4896 the target has different ways of acquiring this information, like
4899 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4900 to tell gdb about. */
4903 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4905 unsigned long text
, text_end
, data
;
4906 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4910 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4911 (PTRACE_TYPE_ARG4
) 0);
4912 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4913 (PTRACE_TYPE_ARG4
) 0);
4914 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4915 (PTRACE_TYPE_ARG4
) 0);
4919 /* Both text and data offsets produced at compile-time (and so
4920 used by gdb) are relative to the beginning of the program,
4921 with the data segment immediately following the text segment.
4922 However, the actual runtime layout in memory may put the data
4923 somewhere else, so when we send gdb a data base-address, we
4924 use the real data base address and subtract the compile-time
4925 data base-address from it (which is just the length of the
4926 text segment). BSS immediately follows data in both
4929 *data_p
= data
- (text_end
- text
);
4938 linux_qxfer_osdata (const char *annex
,
4939 unsigned char *readbuf
, unsigned const char *writebuf
,
4940 CORE_ADDR offset
, int len
)
4942 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4945 /* Convert a native/host siginfo object, into/from the siginfo in the
4946 layout of the inferiors' architecture. */
4949 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4953 if (the_low_target
.siginfo_fixup
!= NULL
)
4954 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4956 /* If there was no callback, or the callback didn't do anything,
4957 then just do a straight memcpy. */
4961 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4963 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4968 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4969 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4973 char inf_siginfo
[sizeof (siginfo_t
)];
4975 if (current_inferior
== NULL
)
4978 pid
= lwpid_of (current_inferior
);
4981 debug_printf ("%s siginfo for lwp %d.\n",
4982 readbuf
!= NULL
? "Reading" : "Writing",
4985 if (offset
>= sizeof (siginfo
))
4988 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4991 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4992 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4993 inferior with a 64-bit GDBSERVER should look the same as debugging it
4994 with a 32-bit GDBSERVER, we need to convert it. */
4995 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4997 if (offset
+ len
> sizeof (siginfo
))
4998 len
= sizeof (siginfo
) - offset
;
5000 if (readbuf
!= NULL
)
5001 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5004 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5006 /* Convert back to ptrace layout before flushing it out. */
5007 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5009 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5016 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5017 so we notice when children change state; as the handler for the
5018 sigsuspend in my_waitpid. */
5021 sigchld_handler (int signo
)
5023 int old_errno
= errno
;
5029 /* fprintf is not async-signal-safe, so call write
5031 if (write (2, "sigchld_handler\n",
5032 sizeof ("sigchld_handler\n") - 1) < 0)
5033 break; /* just ignore */
5037 if (target_is_async_p ())
5038 async_file_mark (); /* trigger a linux_wait */
5044 linux_supports_non_stop (void)
5050 linux_async (int enable
)
5052 int previous
= (linux_event_pipe
[0] != -1);
5055 debug_printf ("linux_async (%d), previous=%d\n",
5058 if (previous
!= enable
)
5061 sigemptyset (&mask
);
5062 sigaddset (&mask
, SIGCHLD
);
5064 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5068 if (pipe (linux_event_pipe
) == -1)
5069 fatal ("creating event pipe failed.");
5071 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5072 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5074 /* Register the event loop handler. */
5075 add_file_handler (linux_event_pipe
[0],
5076 handle_target_event
, NULL
);
5078 /* Always trigger a linux_wait. */
5083 delete_file_handler (linux_event_pipe
[0]);
5085 close (linux_event_pipe
[0]);
5086 close (linux_event_pipe
[1]);
5087 linux_event_pipe
[0] = -1;
5088 linux_event_pipe
[1] = -1;
5091 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5098 linux_start_non_stop (int nonstop
)
5100 /* Register or unregister from event-loop accordingly. */
5101 linux_async (nonstop
);
5106 linux_supports_multi_process (void)
5112 linux_supports_disable_randomization (void)
5114 #ifdef HAVE_PERSONALITY
5122 linux_supports_agent (void)
5128 linux_supports_range_stepping (void)
5130 if (*the_low_target
.supports_range_stepping
== NULL
)
5133 return (*the_low_target
.supports_range_stepping
) ();
5136 /* Enumerate spufs IDs for process PID. */
5138 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5144 struct dirent
*entry
;
5146 sprintf (path
, "/proc/%ld/fd", pid
);
5147 dir
= opendir (path
);
5152 while ((entry
= readdir (dir
)) != NULL
)
5158 fd
= atoi (entry
->d_name
);
5162 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5163 if (stat (path
, &st
) != 0)
5165 if (!S_ISDIR (st
.st_mode
))
5168 if (statfs (path
, &stfs
) != 0)
5170 if (stfs
.f_type
!= SPUFS_MAGIC
)
5173 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5175 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5185 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5186 object type, using the /proc file system. */
5188 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5189 unsigned const char *writebuf
,
5190 CORE_ADDR offset
, int len
)
5192 long pid
= lwpid_of (current_inferior
);
5197 if (!writebuf
&& !readbuf
)
5205 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5208 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5209 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5214 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5221 ret
= write (fd
, writebuf
, (size_t) len
);
5223 ret
= read (fd
, readbuf
, (size_t) len
);
5229 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5230 struct target_loadseg
5232 /* Core address to which the segment is mapped. */
5234 /* VMA recorded in the program header. */
5236 /* Size of this segment in memory. */
5240 # if defined PT_GETDSBT
5241 struct target_loadmap
5243 /* Protocol version number, must be zero. */
5245 /* Pointer to the DSBT table, its size, and the DSBT index. */
5246 unsigned *dsbt_table
;
5247 unsigned dsbt_size
, dsbt_index
;
5248 /* Number of segments in this map. */
5250 /* The actual memory map. */
5251 struct target_loadseg segs
[/*nsegs*/];
5253 # define LINUX_LOADMAP PT_GETDSBT
5254 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5255 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5257 struct target_loadmap
5259 /* Protocol version number, must be zero. */
5261 /* Number of segments in this map. */
5263 /* The actual memory map. */
5264 struct target_loadseg segs
[/*nsegs*/];
5266 # define LINUX_LOADMAP PTRACE_GETFDPIC
5267 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5268 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5272 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5273 unsigned char *myaddr
, unsigned int len
)
5275 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
5277 struct target_loadmap
*data
= NULL
;
5278 unsigned int actual_length
, copy_length
;
5280 if (strcmp (annex
, "exec") == 0)
5281 addr
= (int) LINUX_LOADMAP_EXEC
;
5282 else if (strcmp (annex
, "interp") == 0)
5283 addr
= (int) LINUX_LOADMAP_INTERP
;
5287 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5293 actual_length
= sizeof (struct target_loadmap
)
5294 + sizeof (struct target_loadseg
) * data
->nsegs
;
5296 if (offset
< 0 || offset
> actual_length
)
5299 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5300 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5304 # define linux_read_loadmap NULL
5305 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5308 linux_process_qsupported (const char *query
)
5310 if (the_low_target
.process_qsupported
!= NULL
)
5311 the_low_target
.process_qsupported (query
);
5315 linux_supports_tracepoints (void)
5317 if (*the_low_target
.supports_tracepoints
== NULL
)
5320 return (*the_low_target
.supports_tracepoints
) ();
5324 linux_read_pc (struct regcache
*regcache
)
5326 if (the_low_target
.get_pc
== NULL
)
5329 return (*the_low_target
.get_pc
) (regcache
);
5333 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5335 gdb_assert (the_low_target
.set_pc
!= NULL
);
5337 (*the_low_target
.set_pc
) (regcache
, pc
);
5341 linux_thread_stopped (struct thread_info
*thread
)
5343 return get_thread_lwp (thread
)->stopped
;
5346 /* This exposes stop-all-threads functionality to other modules. */
5349 linux_pause_all (int freeze
)
5351 stop_all_lwps (freeze
, NULL
);
5354 /* This exposes unstop-all-threads functionality to other gdbserver
5358 linux_unpause_all (int unfreeze
)
5360 unstop_all_lwps (unfreeze
, NULL
);
5364 linux_prepare_to_access_memory (void)
5366 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5369 linux_pause_all (1);
5374 linux_done_accessing_memory (void)
5376 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5379 linux_unpause_all (1);
5383 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5384 CORE_ADDR collector
,
5387 CORE_ADDR
*jump_entry
,
5388 CORE_ADDR
*trampoline
,
5389 ULONGEST
*trampoline_size
,
5390 unsigned char *jjump_pad_insn
,
5391 ULONGEST
*jjump_pad_insn_size
,
5392 CORE_ADDR
*adjusted_insn_addr
,
5393 CORE_ADDR
*adjusted_insn_addr_end
,
5396 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5397 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5398 jump_entry
, trampoline
, trampoline_size
,
5399 jjump_pad_insn
, jjump_pad_insn_size
,
5400 adjusted_insn_addr
, adjusted_insn_addr_end
,
5404 static struct emit_ops
*
5405 linux_emit_ops (void)
5407 if (the_low_target
.emit_ops
!= NULL
)
5408 return (*the_low_target
.emit_ops
) ();
5414 linux_get_min_fast_tracepoint_insn_len (void)
5416 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5419 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5422 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5423 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5425 char filename
[PATH_MAX
];
5427 const int auxv_size
= is_elf64
5428 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5429 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5431 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5433 fd
= open (filename
, O_RDONLY
);
5439 while (read (fd
, buf
, auxv_size
) == auxv_size
5440 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5444 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5446 switch (aux
->a_type
)
5449 *phdr_memaddr
= aux
->a_un
.a_val
;
5452 *num_phdr
= aux
->a_un
.a_val
;
5458 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5460 switch (aux
->a_type
)
5463 *phdr_memaddr
= aux
->a_un
.a_val
;
5466 *num_phdr
= aux
->a_un
.a_val
;
5474 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5476 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5477 "phdr_memaddr = %ld, phdr_num = %d",
5478 (long) *phdr_memaddr
, *num_phdr
);
5485 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5488 get_dynamic (const int pid
, const int is_elf64
)
5490 CORE_ADDR phdr_memaddr
, relocation
;
5492 unsigned char *phdr_buf
;
5493 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5495 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5498 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5499 phdr_buf
= alloca (num_phdr
* phdr_size
);
5501 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5504 /* Compute relocation: it is expected to be 0 for "regular" executables,
5505 non-zero for PIE ones. */
5507 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5510 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5512 if (p
->p_type
== PT_PHDR
)
5513 relocation
= phdr_memaddr
- p
->p_vaddr
;
5517 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5519 if (p
->p_type
== PT_PHDR
)
5520 relocation
= phdr_memaddr
- p
->p_vaddr
;
5523 if (relocation
== -1)
5525 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5526 any real world executables, including PIE executables, have always
5527 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5528 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5529 or present DT_DEBUG anyway (fpc binaries are statically linked).
5531 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5533 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5538 for (i
= 0; i
< num_phdr
; i
++)
5542 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5544 if (p
->p_type
== PT_DYNAMIC
)
5545 return p
->p_vaddr
+ relocation
;
5549 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5551 if (p
->p_type
== PT_DYNAMIC
)
5552 return p
->p_vaddr
+ relocation
;
5559 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5560 can be 0 if the inferior does not yet have the library list initialized.
5561 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5562 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5565 get_r_debug (const int pid
, const int is_elf64
)
5567 CORE_ADDR dynamic_memaddr
;
5568 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5569 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5572 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5573 if (dynamic_memaddr
== 0)
5576 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5580 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5581 #ifdef DT_MIPS_RLD_MAP
5585 unsigned char buf
[sizeof (Elf64_Xword
)];
5589 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5591 if (linux_read_memory (dyn
->d_un
.d_val
,
5592 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5597 #endif /* DT_MIPS_RLD_MAP */
5599 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5600 map
= dyn
->d_un
.d_val
;
5602 if (dyn
->d_tag
== DT_NULL
)
5607 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5608 #ifdef DT_MIPS_RLD_MAP
5612 unsigned char buf
[sizeof (Elf32_Word
)];
5616 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5618 if (linux_read_memory (dyn
->d_un
.d_val
,
5619 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5624 #endif /* DT_MIPS_RLD_MAP */
5626 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5627 map
= dyn
->d_un
.d_val
;
5629 if (dyn
->d_tag
== DT_NULL
)
5633 dynamic_memaddr
+= dyn_size
;
5639 /* Read one pointer from MEMADDR in the inferior. */
5642 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5646 /* Go through a union so this works on either big or little endian
5647 hosts, when the inferior's pointer size is smaller than the size
5648 of CORE_ADDR. It is assumed the inferior's endianness is the
5649 same of the superior's. */
5652 CORE_ADDR core_addr
;
5657 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5660 if (ptr_size
== sizeof (CORE_ADDR
))
5661 *ptr
= addr
.core_addr
;
5662 else if (ptr_size
== sizeof (unsigned int))
5665 gdb_assert_not_reached ("unhandled pointer size");
5670 struct link_map_offsets
5672 /* Offset and size of r_debug.r_version. */
5673 int r_version_offset
;
5675 /* Offset and size of r_debug.r_map. */
5678 /* Offset to l_addr field in struct link_map. */
5681 /* Offset to l_name field in struct link_map. */
5684 /* Offset to l_ld field in struct link_map. */
5687 /* Offset to l_next field in struct link_map. */
5690 /* Offset to l_prev field in struct link_map. */
5694 /* Construct qXfer:libraries-svr4:read reply. */
5697 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5698 unsigned const char *writebuf
,
5699 CORE_ADDR offset
, int len
)
5702 unsigned document_len
;
5703 struct process_info_private
*const priv
= current_process ()->private;
5704 char filename
[PATH_MAX
];
5707 static const struct link_map_offsets lmo_32bit_offsets
=
5709 0, /* r_version offset. */
5710 4, /* r_debug.r_map offset. */
5711 0, /* l_addr offset in link_map. */
5712 4, /* l_name offset in link_map. */
5713 8, /* l_ld offset in link_map. */
5714 12, /* l_next offset in link_map. */
5715 16 /* l_prev offset in link_map. */
5718 static const struct link_map_offsets lmo_64bit_offsets
=
5720 0, /* r_version offset. */
5721 8, /* r_debug.r_map offset. */
5722 0, /* l_addr offset in link_map. */
5723 8, /* l_name offset in link_map. */
5724 16, /* l_ld offset in link_map. */
5725 24, /* l_next offset in link_map. */
5726 32 /* l_prev offset in link_map. */
5728 const struct link_map_offsets
*lmo
;
5729 unsigned int machine
;
5731 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5732 int allocated
= 1024;
5734 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5735 int header_done
= 0;
5737 if (writebuf
!= NULL
)
5739 if (readbuf
== NULL
)
5742 pid
= lwpid_of (current_inferior
);
5743 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5744 is_elf64
= elf_64_file_p (filename
, &machine
);
5745 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5746 ptr_size
= is_elf64
? 8 : 4;
5748 while (annex
[0] != '\0')
5754 sep
= strchr (annex
, '=');
5759 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5761 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5765 annex
= strchr (sep
, ';');
5772 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5779 if (priv
->r_debug
== 0)
5780 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5782 /* We failed to find DT_DEBUG. Such situation will not change
5783 for this inferior - do not retry it. Report it to GDB as
5784 E01, see for the reasons at the GDB solib-svr4.c side. */
5785 if (priv
->r_debug
== (CORE_ADDR
) -1)
5788 if (priv
->r_debug
!= 0)
5790 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5791 (unsigned char *) &r_version
,
5792 sizeof (r_version
)) != 0
5795 warning ("unexpected r_debug version %d", r_version
);
5797 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5798 &lm_addr
, ptr_size
) != 0)
5800 warning ("unable to read r_map from 0x%lx",
5801 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5806 document
= xmalloc (allocated
);
5807 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5808 p
= document
+ strlen (document
);
5811 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5812 &l_name
, ptr_size
) == 0
5813 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5814 &l_addr
, ptr_size
) == 0
5815 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5816 &l_ld
, ptr_size
) == 0
5817 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5818 &l_prev
, ptr_size
) == 0
5819 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5820 &l_next
, ptr_size
) == 0)
5822 unsigned char libname
[PATH_MAX
];
5824 if (lm_prev
!= l_prev
)
5826 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5827 (long) lm_prev
, (long) l_prev
);
5831 /* Ignore the first entry even if it has valid name as the first entry
5832 corresponds to the main executable. The first entry should not be
5833 skipped if the dynamic loader was loaded late by a static executable
5834 (see solib-svr4.c parameter ignore_first). But in such case the main
5835 executable does not have PT_DYNAMIC present and this function already
5836 exited above due to failed get_r_debug. */
5839 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5844 /* Not checking for error because reading may stop before
5845 we've got PATH_MAX worth of characters. */
5847 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5848 libname
[sizeof (libname
) - 1] = '\0';
5849 if (libname
[0] != '\0')
5851 /* 6x the size for xml_escape_text below. */
5852 size_t len
= 6 * strlen ((char *) libname
);
5857 /* Terminate `<library-list-svr4'. */
5862 while (allocated
< p
- document
+ len
+ 200)
5864 /* Expand to guarantee sufficient storage. */
5865 uintptr_t document_len
= p
- document
;
5867 document
= xrealloc (document
, 2 * allocated
);
5869 p
= document
+ document_len
;
5872 name
= xml_escape_text ((char *) libname
);
5873 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5874 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5875 name
, (unsigned long) lm_addr
,
5876 (unsigned long) l_addr
, (unsigned long) l_ld
);
5887 /* Empty list; terminate `<library-list-svr4'. */
5891 strcpy (p
, "</library-list-svr4>");
5893 document_len
= strlen (document
);
5894 if (offset
< document_len
)
5895 document_len
-= offset
;
5898 if (len
> document_len
)
5901 memcpy (readbuf
, document
+ offset
, len
);
5907 #ifdef HAVE_LINUX_BTRACE
5909 /* See to_enable_btrace target method. */
5911 static struct btrace_target_info
*
5912 linux_low_enable_btrace (ptid_t ptid
)
5914 struct btrace_target_info
*tinfo
;
5916 tinfo
= linux_enable_btrace (ptid
);
5920 struct thread_info
*thread
= find_thread_ptid (ptid
);
5921 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5923 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5929 /* See to_disable_btrace target method. */
5932 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5934 enum btrace_error err
;
5936 err
= linux_disable_btrace (tinfo
);
5937 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5940 /* See to_read_btrace target method. */
5943 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5946 VEC (btrace_block_s
) *btrace
;
5947 struct btrace_block
*block
;
5948 enum btrace_error err
;
5952 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5953 if (err
!= BTRACE_ERR_NONE
)
5955 if (err
== BTRACE_ERR_OVERFLOW
)
5956 buffer_grow_str0 (buffer
, "E.Overflow.");
5958 buffer_grow_str0 (buffer
, "E.Generic Error.");
5963 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5964 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5966 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5967 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5968 paddress (block
->begin
), paddress (block
->end
));
5970 buffer_grow_str0 (buffer
, "</btrace>\n");
5972 VEC_free (btrace_block_s
, btrace
);
5976 #endif /* HAVE_LINUX_BTRACE */
5978 static struct target_ops linux_target_ops
= {
5979 linux_create_inferior
,
5988 linux_fetch_registers
,
5989 linux_store_registers
,
5990 linux_prepare_to_access_memory
,
5991 linux_done_accessing_memory
,
5994 linux_look_up_symbols
,
5995 linux_request_interrupt
,
5999 linux_stopped_by_watchpoint
,
6000 linux_stopped_data_address
,
6001 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6002 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6003 && defined(PT_TEXT_END_ADDR)
6008 #ifdef USE_THREAD_DB
6009 thread_db_get_tls_address
,
6014 hostio_last_error_from_errno
,
6017 linux_supports_non_stop
,
6019 linux_start_non_stop
,
6020 linux_supports_multi_process
,
6021 #ifdef USE_THREAD_DB
6022 thread_db_handle_monitor_command
,
6026 linux_common_core_of_thread
,
6028 linux_process_qsupported
,
6029 linux_supports_tracepoints
,
6032 linux_thread_stopped
,
6036 linux_cancel_breakpoints
,
6037 linux_stabilize_threads
,
6038 linux_install_fast_tracepoint_jump_pad
,
6040 linux_supports_disable_randomization
,
6041 linux_get_min_fast_tracepoint_insn_len
,
6042 linux_qxfer_libraries_svr4
,
6043 linux_supports_agent
,
6044 #ifdef HAVE_LINUX_BTRACE
6045 linux_supports_btrace
,
6046 linux_low_enable_btrace
,
6047 linux_low_disable_btrace
,
6048 linux_low_read_btrace
,
6055 linux_supports_range_stepping
,
6059 linux_init_signals ()
6061 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6062 to find what the cancel signal actually is. */
6063 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6064 signal (__SIGRTMIN
+1, SIG_IGN
);
6068 #ifdef HAVE_LINUX_REGSETS
6070 initialize_regsets_info (struct regsets_info
*info
)
6072 for (info
->num_regsets
= 0;
6073 info
->regsets
[info
->num_regsets
].size
>= 0;
6074 info
->num_regsets
++)
6080 initialize_low (void)
6082 struct sigaction sigchld_action
;
6083 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6084 set_target_ops (&linux_target_ops
);
6085 set_breakpoint_data (the_low_target
.breakpoint
,
6086 the_low_target
.breakpoint_len
);
6087 linux_init_signals ();
6088 linux_ptrace_init_warnings ();
6090 sigchld_action
.sa_handler
= sigchld_handler
;
6091 sigemptyset (&sigchld_action
.sa_mask
);
6092 sigchld_action
.sa_flags
= SA_RESTART
;
6093 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6095 initialize_low_arch ();