1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
24 #include "nat/linux-nat.h"
25 #include "nat/linux-waitpid.h"
27 #include <sys/ptrace.h>
28 #include "nat/linux-ptrace.h"
29 #include "nat/linux-procfs.h"
31 #include <sys/ioctl.h>
34 #include <sys/syscall.h>
38 #include <sys/types.h>
43 #include "filestuff.h"
44 #include "tracepoint.h"
47 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
48 then ELFMAG0 will have been defined. If it didn't get included by
49 gdb_proc_service.h then including it will likely introduce a duplicate
50 definition of elf_fpregset_t. */
55 #define SPUFS_MAGIC 0x23c9b64e
58 #ifdef HAVE_PERSONALITY
59 # include <sys/personality.h>
60 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
61 # define ADDR_NO_RANDOMIZE 0x0040000
70 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
73 /* This is the kernel's hard limit. Not to be confused with
79 /* Some targets did not define these ptrace constants from the start,
80 so gdbserver defines them locally here. In the future, these may
81 be removed after they are added to asm/ptrace.h. */
82 #if !(defined(PT_TEXT_ADDR) \
83 || defined(PT_DATA_ADDR) \
84 || defined(PT_TEXT_END_ADDR))
85 #if defined(__mcoldfire__)
86 /* These are still undefined in 3.10 kernels. */
87 #define PT_TEXT_ADDR 49*4
88 #define PT_DATA_ADDR 50*4
89 #define PT_TEXT_END_ADDR 51*4
90 /* BFIN already defines these since at least 2.6.32 kernels. */
92 #define PT_TEXT_ADDR 220
93 #define PT_TEXT_END_ADDR 224
94 #define PT_DATA_ADDR 228
95 /* These are still undefined in 3.10 kernels. */
96 #elif defined(__TMS320C6X__)
97 #define PT_TEXT_ADDR (0x10000*4)
98 #define PT_DATA_ADDR (0x10004*4)
99 #define PT_TEXT_END_ADDR (0x10008*4)
103 #ifdef HAVE_LINUX_BTRACE
104 # include "nat/linux-btrace.h"
107 #ifndef HAVE_ELF32_AUXV_T
108 /* Copied from glibc's elf.h. */
111 uint32_t a_type
; /* Entry type */
114 uint32_t a_val
; /* Integer value */
115 /* We use to have pointer elements added here. We cannot do that,
116 though, since it does not work when using 32-bit definitions
117 on 64-bit platforms and vice versa. */
122 #ifndef HAVE_ELF64_AUXV_T
123 /* Copied from glibc's elf.h. */
126 uint64_t a_type
; /* Entry type */
129 uint64_t a_val
; /* Integer value */
130 /* We use to have pointer elements added here. We cannot do that,
131 though, since it does not work when using 32-bit definitions
132 on 64-bit platforms and vice versa. */
137 /* A list of all unknown processes which receive stop signals. Some
138 other process will presumably claim each of these as forked
139 children momentarily. */
141 struct simple_pid_list
143 /* The process ID. */
146 /* The status as reported by waitpid. */
150 struct simple_pid_list
*next
;
152 struct simple_pid_list
*stopped_pids
;
154 /* Trivial list manipulation functions to keep track of a list of new
155 stopped processes. */
158 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
160 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
163 new_pid
->status
= status
;
164 new_pid
->next
= *listp
;
169 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
171 struct simple_pid_list
**p
;
173 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
174 if ((*p
)->pid
== pid
)
176 struct simple_pid_list
*next
= (*p
)->next
;
178 *statusp
= (*p
)->status
;
186 enum stopping_threads_kind
188 /* Not stopping threads presently. */
189 NOT_STOPPING_THREADS
,
191 /* Stopping threads. */
194 /* Stopping and suspending threads. */
195 STOPPING_AND_SUSPENDING_THREADS
198 /* This is set while stop_all_lwps is in effect. */
199 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
201 /* FIXME make into a target method? */
202 int using_threads
= 1;
204 /* True if we're presently stabilizing threads (moving them out of
206 static int stabilizing_threads
;
208 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
209 int step
, int signal
, siginfo_t
*info
);
210 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
211 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
212 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
213 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
214 int *wstat
, int options
);
215 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
216 static struct lwp_info
*add_lwp (ptid_t ptid
);
217 static int linux_stopped_by_watchpoint (void);
218 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
219 static void proceed_all_lwps (void);
220 static int finish_step_over (struct lwp_info
*lwp
);
221 static int kill_lwp (unsigned long lwpid
, int signo
);
223 /* When the event-loop is doing a step-over, this points at the thread
225 ptid_t step_over_bkpt
;
227 /* True if the low target can hardware single-step. Such targets
228 don't need a BREAKPOINT_REINSERT_ADDR callback. */
231 can_hardware_single_step (void)
233 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
236 /* True if the low target supports memory breakpoints. If so, we'll
237 have a GET_PC implementation. */
240 supports_breakpoints (void)
242 return (the_low_target
.get_pc
!= NULL
);
245 /* Returns true if this target can support fast tracepoints. This
246 does not mean that the in-process agent has been loaded in the
250 supports_fast_tracepoints (void)
252 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
255 /* True if LWP is stopped in its stepping range. */
258 lwp_in_step_range (struct lwp_info
*lwp
)
260 CORE_ADDR pc
= lwp
->stop_pc
;
262 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
265 struct pending_signals
269 struct pending_signals
*prev
;
272 /* The read/write ends of the pipe registered as waitable file in the
274 static int linux_event_pipe
[2] = { -1, -1 };
276 /* True if we're currently in async mode. */
277 #define target_is_async_p() (linux_event_pipe[0] != -1)
279 static void send_sigstop (struct lwp_info
*lwp
);
280 static void wait_for_sigstop (void);
282 /* Return non-zero if HEADER is a 64-bit ELF file. */
285 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
287 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
288 && header
->e_ident
[EI_MAG1
] == ELFMAG1
289 && header
->e_ident
[EI_MAG2
] == ELFMAG2
290 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
292 *machine
= header
->e_machine
;
293 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
300 /* Return non-zero if FILE is a 64-bit ELF file,
301 zero if the file is not a 64-bit ELF file,
302 and -1 if the file is not accessible or doesn't exist. */
305 elf_64_file_p (const char *file
, unsigned int *machine
)
310 fd
= open (file
, O_RDONLY
);
314 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
321 return elf_64_header_p (&header
, machine
);
324 /* Accepts an integer PID; Returns true if the executable PID is
325 running is a 64-bit ELF file.. */
328 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
332 sprintf (file
, "/proc/%d/exe", pid
);
333 return elf_64_file_p (file
, machine
);
337 delete_lwp (struct lwp_info
*lwp
)
339 struct thread_info
*thr
= get_lwp_thread (lwp
);
342 debug_printf ("deleting %ld\n", lwpid_of (thr
));
345 free (lwp
->arch_private
);
349 /* Add a process to the common process list, and set its private
352 static struct process_info
*
353 linux_add_process (int pid
, int attached
)
355 struct process_info
*proc
;
357 proc
= add_process (pid
, attached
);
358 proc
->private = xcalloc (1, sizeof (*proc
->private));
360 /* Set the arch when the first LWP stops. */
361 proc
->private->new_inferior
= 1;
363 if (the_low_target
.new_process
!= NULL
)
364 proc
->private->arch_private
= the_low_target
.new_process ();
369 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
371 /* Handle a GNU/Linux extended wait response. If we see a clone
372 event, we need to add the new LWP to our list (and not report the
373 trap to higher layers). */
376 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
378 int event
= linux_ptrace_get_extended_event (wstat
);
379 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
380 struct lwp_info
*new_lwp
;
382 if (event
== PTRACE_EVENT_CLONE
)
385 unsigned long new_pid
;
388 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
391 /* If we haven't already seen the new PID stop, wait for it now. */
392 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
394 /* The new child has a pending SIGSTOP. We can't affect it until it
395 hits the SIGSTOP, but we're already attached. */
397 ret
= my_waitpid (new_pid
, &status
, __WALL
);
400 perror_with_name ("waiting for new child");
401 else if (ret
!= new_pid
)
402 warning ("wait returned unexpected PID %d", ret
);
403 else if (!WIFSTOPPED (status
))
404 warning ("wait returned unexpected status 0x%x", status
);
408 debug_printf ("HEW: Got clone event "
409 "from LWP %ld, new child is LWP %ld\n",
410 lwpid_of (event_thr
), new_pid
);
412 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
413 new_lwp
= add_lwp (ptid
);
415 /* Either we're going to immediately resume the new thread
416 or leave it stopped. linux_resume_one_lwp is a nop if it
417 thinks the thread is currently running, so set this first
418 before calling linux_resume_one_lwp. */
419 new_lwp
->stopped
= 1;
421 /* If we're suspending all threads, leave this one suspended
423 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
424 new_lwp
->suspended
= 1;
426 /* Normally we will get the pending SIGSTOP. But in some cases
427 we might get another signal delivered to the group first.
428 If we do get another signal, be sure not to lose it. */
429 if (WSTOPSIG (status
) == SIGSTOP
)
431 if (stopping_threads
== NOT_STOPPING_THREADS
)
432 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
436 new_lwp
->stop_expected
= 1;
438 if (stopping_threads
!= NOT_STOPPING_THREADS
)
440 new_lwp
->status_pending_p
= 1;
441 new_lwp
->status_pending
= status
;
444 /* Pass the signal on. This is what GDB does - except
445 shouldn't we really report it instead? */
446 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
449 /* Always resume the current thread. If we are stopping
450 threads, it will have a pending SIGSTOP; we may as well
452 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
456 /* Return the PC as read from the regcache of LWP, without any
460 get_pc (struct lwp_info
*lwp
)
462 struct thread_info
*saved_thread
;
463 struct regcache
*regcache
;
466 if (the_low_target
.get_pc
== NULL
)
469 saved_thread
= current_thread
;
470 current_thread
= get_lwp_thread (lwp
);
472 regcache
= get_thread_regcache (current_thread
, 1);
473 pc
= (*the_low_target
.get_pc
) (regcache
);
476 debug_printf ("pc is 0x%lx\n", (long) pc
);
478 current_thread
= saved_thread
;
482 /* This function should only be called if LWP got a SIGTRAP.
483 The SIGTRAP could mean several things.
485 On i386, where decr_pc_after_break is non-zero:
487 If we were single-stepping this process using PTRACE_SINGLESTEP, we
488 will get only the one SIGTRAP. The value of $eip will be the next
489 instruction. If the instruction we stepped over was a breakpoint,
490 we need to decrement the PC.
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 the breakpoint is removed, we
497 must resume at the decremented PC.
499 On a non-decr_pc_after_break machine with hardware or kernel
502 If we either single-step a breakpoint instruction, or continue and
503 hit a breakpoint instruction, our PC will point at the breakpoint
507 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
510 CORE_ADDR sw_breakpoint_pc
;
511 struct thread_info
*saved_thread
;
513 if (the_low_target
.get_pc
== NULL
)
517 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
519 /* breakpoint_at reads from the current thread. */
520 saved_thread
= current_thread
;
521 current_thread
= get_lwp_thread (lwp
);
523 /* We may have just stepped a breakpoint instruction. E.g., in
524 non-stop mode, GDB first tells the thread A to step a range, and
525 then the user inserts a breakpoint inside the range. In that
526 case, we need to report the breakpoint PC. But, when we're
527 trying to step past one of our own breakpoints, that happens to
528 have been placed on top of a permanent breakpoint instruction, we
529 shouldn't adjust the PC, otherwise the program would keep
530 trapping the permanent breakpoint forever. */
532 || (!ptid_equal (ptid_of (current_thread
), step_over_bkpt
)
533 && lwp
->stop_pc
== sw_breakpoint_pc
))
534 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
538 struct thread_info
*thr
= get_lwp_thread (lwp
);
540 debug_printf ("CSBB: %s stopped by software breakpoint\n",
541 target_pid_to_str (ptid_of (thr
)));
544 /* Back up the PC if necessary. */
545 if (pc
!= sw_breakpoint_pc
)
547 struct regcache
*regcache
548 = get_thread_regcache (current_thread
, 1);
549 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
552 lwp
->stop_pc
= sw_breakpoint_pc
;
553 lwp
->stop_reason
= LWP_STOPPED_BY_SW_BREAKPOINT
;
554 current_thread
= saved_thread
;
558 if (hardware_breakpoint_inserted_here (pc
))
562 struct thread_info
*thr
= get_lwp_thread (lwp
);
564 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
565 target_pid_to_str (ptid_of (thr
)));
569 lwp
->stop_reason
= LWP_STOPPED_BY_HW_BREAKPOINT
;
570 current_thread
= saved_thread
;
574 current_thread
= saved_thread
;
578 static struct lwp_info
*
579 add_lwp (ptid_t ptid
)
581 struct lwp_info
*lwp
;
583 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
584 memset (lwp
, 0, sizeof (*lwp
));
586 if (the_low_target
.new_thread
!= NULL
)
587 lwp
->arch_private
= the_low_target
.new_thread ();
589 lwp
->thread
= add_thread (ptid
, lwp
);
594 /* Start an inferior process and returns its pid.
595 ALLARGS is a vector of program-name and args. */
598 linux_create_inferior (char *program
, char **allargs
)
600 #ifdef HAVE_PERSONALITY
601 int personality_orig
= 0, personality_set
= 0;
603 struct lwp_info
*new_lwp
;
607 #ifdef HAVE_PERSONALITY
608 if (disable_randomization
)
611 personality_orig
= personality (0xffffffff);
612 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
615 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
617 if (errno
!= 0 || (personality_set
618 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
619 warning ("Error disabling address space randomization: %s",
624 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
630 perror_with_name ("fork");
635 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
637 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
638 signal (__SIGRTMIN
+ 1, SIG_DFL
);
643 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
644 stdout to stderr so that inferior i/o doesn't corrupt the connection.
645 Also, redirect stdin to /dev/null. */
646 if (remote_connection_is_stdio ())
649 open ("/dev/null", O_RDONLY
);
651 if (write (2, "stdin/stdout redirected\n",
652 sizeof ("stdin/stdout redirected\n") - 1) < 0)
654 /* Errors ignored. */;
658 execv (program
, allargs
);
660 execvp (program
, allargs
);
662 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
668 #ifdef HAVE_PERSONALITY
672 personality (personality_orig
);
674 warning ("Error restoring address space randomization: %s",
679 linux_add_process (pid
, 0);
681 ptid
= ptid_build (pid
, pid
, 0);
682 new_lwp
= add_lwp (ptid
);
683 new_lwp
->must_set_ptrace_flags
= 1;
688 /* Attach to an inferior process. Returns 0 on success, ERRNO on
692 linux_attach_lwp (ptid_t ptid
)
694 struct lwp_info
*new_lwp
;
695 int lwpid
= ptid_get_lwp (ptid
);
697 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
701 new_lwp
= add_lwp (ptid
);
703 /* We need to wait for SIGSTOP before being able to make the next
704 ptrace call on this LWP. */
705 new_lwp
->must_set_ptrace_flags
= 1;
707 if (linux_proc_pid_is_stopped (lwpid
))
710 debug_printf ("Attached to a stopped process\n");
712 /* The process is definitely stopped. It is in a job control
713 stop, unless the kernel predates the TASK_STOPPED /
714 TASK_TRACED distinction, in which case it might be in a
715 ptrace stop. Make sure it is in a ptrace stop; from there we
716 can kill it, signal it, et cetera.
718 First make sure there is a pending SIGSTOP. Since we are
719 already attached, the process can not transition from stopped
720 to running without a PTRACE_CONT; so we know this signal will
721 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
722 probably already in the queue (unless this kernel is old
723 enough to use TASK_STOPPED for ptrace stops); but since
724 SIGSTOP is not an RT signal, it can only be queued once. */
725 kill_lwp (lwpid
, SIGSTOP
);
727 /* Finally, resume the stopped process. This will deliver the
728 SIGSTOP (or a higher priority signal, just like normal
729 PTRACE_ATTACH), which we'll catch later on. */
730 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
733 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
736 There are several cases to consider here:
738 1) gdbserver has already attached to the process and is being notified
739 of a new thread that is being created.
740 In this case we should ignore that SIGSTOP and resume the
741 process. This is handled below by setting stop_expected = 1,
742 and the fact that add_thread sets last_resume_kind ==
745 2) This is the first thread (the process thread), and we're attaching
746 to it via attach_inferior.
747 In this case we want the process thread to stop.
748 This is handled by having linux_attach set last_resume_kind ==
749 resume_stop after we return.
751 If the pid we are attaching to is also the tgid, we attach to and
752 stop all the existing threads. Otherwise, we attach to pid and
753 ignore any other threads in the same group as this pid.
755 3) GDB is connecting to gdbserver and is requesting an enumeration of all
757 In this case we want the thread to stop.
758 FIXME: This case is currently not properly handled.
759 We should wait for the SIGSTOP but don't. Things work apparently
760 because enough time passes between when we ptrace (ATTACH) and when
761 gdb makes the next ptrace call on the thread.
763 On the other hand, if we are currently trying to stop all threads, we
764 should treat the new thread as if we had sent it a SIGSTOP. This works
765 because we are guaranteed that the add_lwp call above added us to the
766 end of the list, and so the new thread has not yet reached
767 wait_for_sigstop (but will). */
768 new_lwp
->stop_expected
= 1;
773 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
774 already attached. Returns true if a new LWP is found, false
778 attach_proc_task_lwp_callback (ptid_t ptid
)
780 /* Is this a new thread? */
781 if (find_thread_ptid (ptid
) == NULL
)
783 int lwpid
= ptid_get_lwp (ptid
);
787 debug_printf ("Found new lwp %d\n", lwpid
);
789 err
= linux_attach_lwp (ptid
);
791 /* Be quiet if we simply raced with the thread exiting. EPERM
792 is returned if the thread's task still exists, and is marked
793 as exited or zombie, as well as other conditions, so in that
794 case, confirm the status in /proc/PID/status. */
796 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
800 debug_printf ("Cannot attach to lwp %d: "
801 "thread is gone (%d: %s)\n",
802 lwpid
, err
, strerror (err
));
807 warning (_("Cannot attach to lwp %d: %s"),
809 linux_ptrace_attach_fail_reason_string (ptid
, err
));
817 /* Attach to PID. If PID is the tgid, attach to it and all
821 linux_attach (unsigned long pid
)
823 ptid_t ptid
= ptid_build (pid
, pid
, 0);
826 /* Attach to PID. We will check for other threads
828 err
= linux_attach_lwp (ptid
);
830 error ("Cannot attach to process %ld: %s",
831 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
833 linux_add_process (pid
, 1);
837 struct thread_info
*thread
;
839 /* Don't ignore the initial SIGSTOP if we just attached to this
840 process. It will be collected by wait shortly. */
841 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
842 thread
->last_resume_kind
= resume_stop
;
845 /* We must attach to every LWP. If /proc is mounted, use that to
846 find them now. On the one hand, the inferior may be using raw
847 clone instead of using pthreads. On the other hand, even if it
848 is using pthreads, GDB may not be connected yet (thread_db needs
849 to do symbol lookups, through qSymbol). Also, thread_db walks
850 structures in the inferior's address space to find the list of
851 threads/LWPs, and those structures may well be corrupted. Note
852 that once thread_db is loaded, we'll still use it to list threads
853 and associate pthread info with each LWP. */
854 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
865 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
867 struct counter
*counter
= args
;
869 if (ptid_get_pid (entry
->id
) == counter
->pid
)
871 if (++counter
->count
> 1)
879 last_thread_of_process_p (int pid
)
881 struct counter counter
= { pid
, 0 };
883 return (find_inferior (&all_threads
,
884 second_thread_of_pid_p
, &counter
) == NULL
);
890 linux_kill_one_lwp (struct lwp_info
*lwp
)
892 struct thread_info
*thr
= get_lwp_thread (lwp
);
893 int pid
= lwpid_of (thr
);
895 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
896 there is no signal context, and ptrace(PTRACE_KILL) (or
897 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
898 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
899 alternative is to kill with SIGKILL. We only need one SIGKILL
900 per process, not one for each thread. But since we still support
901 linuxthreads, and we also support debugging programs using raw
902 clone without CLONE_THREAD, we send one for each thread. For
903 years, we used PTRACE_KILL only, so we're being a bit paranoid
904 about some old kernels where PTRACE_KILL might work better
905 (dubious if there are any such, but that's why it's paranoia), so
906 we try SIGKILL first, PTRACE_KILL second, and so we're fine
910 kill_lwp (pid
, SIGKILL
);
913 int save_errno
= errno
;
915 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
916 target_pid_to_str (ptid_of (thr
)),
917 save_errno
? strerror (save_errno
) : "OK");
921 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
924 int save_errno
= errno
;
926 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
927 target_pid_to_str (ptid_of (thr
)),
928 save_errno
? strerror (save_errno
) : "OK");
932 /* Kill LWP and wait for it to die. */
935 kill_wait_lwp (struct lwp_info
*lwp
)
937 struct thread_info
*thr
= get_lwp_thread (lwp
);
938 int pid
= ptid_get_pid (ptid_of (thr
));
939 int lwpid
= ptid_get_lwp (ptid_of (thr
));
944 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
948 linux_kill_one_lwp (lwp
);
950 /* Make sure it died. Notes:
952 - The loop is most likely unnecessary.
954 - We don't use linux_wait_for_event as that could delete lwps
955 while we're iterating over them. We're not interested in
956 any pending status at this point, only in making sure all
957 wait status on the kernel side are collected until the
960 - We don't use __WALL here as the __WALL emulation relies on
961 SIGCHLD, and killing a stopped process doesn't generate
962 one, nor an exit status.
964 res
= my_waitpid (lwpid
, &wstat
, 0);
965 if (res
== -1 && errno
== ECHILD
)
966 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
967 } while (res
> 0 && WIFSTOPPED (wstat
));
969 gdb_assert (res
> 0);
972 /* Callback for `find_inferior'. Kills an lwp of a given process,
973 except the leader. */
976 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
978 struct thread_info
*thread
= (struct thread_info
*) entry
;
979 struct lwp_info
*lwp
= get_thread_lwp (thread
);
980 int pid
= * (int *) args
;
982 if (ptid_get_pid (entry
->id
) != pid
)
985 /* We avoid killing the first thread here, because of a Linux kernel (at
986 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
987 the children get a chance to be reaped, it will remain a zombie
990 if (lwpid_of (thread
) == pid
)
993 debug_printf ("lkop: is last of process %s\n",
994 target_pid_to_str (entry
->id
));
1003 linux_kill (int pid
)
1005 struct process_info
*process
;
1006 struct lwp_info
*lwp
;
1008 process
= find_process_pid (pid
);
1009 if (process
== NULL
)
1012 /* If we're killing a running inferior, make sure it is stopped
1013 first, as PTRACE_KILL will not work otherwise. */
1014 stop_all_lwps (0, NULL
);
1016 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1018 /* See the comment in linux_kill_one_lwp. We did not kill the first
1019 thread in the list, so do so now. */
1020 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1025 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1029 kill_wait_lwp (lwp
);
1031 the_target
->mourn (process
);
1033 /* Since we presently can only stop all lwps of all processes, we
1034 need to unstop lwps of other processes. */
1035 unstop_all_lwps (0, NULL
);
1039 /* Get pending signal of THREAD, for detaching purposes. This is the
1040 signal the thread last stopped for, which we need to deliver to the
1041 thread when detaching, otherwise, it'd be suppressed/lost. */
1044 get_detach_signal (struct thread_info
*thread
)
1046 enum gdb_signal signo
= GDB_SIGNAL_0
;
1048 struct lwp_info
*lp
= get_thread_lwp (thread
);
1050 if (lp
->status_pending_p
)
1051 status
= lp
->status_pending
;
1054 /* If the thread had been suspended by gdbserver, and it stopped
1055 cleanly, then it'll have stopped with SIGSTOP. But we don't
1056 want to deliver that SIGSTOP. */
1057 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1058 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1061 /* Otherwise, we may need to deliver the signal we
1063 status
= lp
->last_status
;
1066 if (!WIFSTOPPED (status
))
1069 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1070 target_pid_to_str (ptid_of (thread
)));
1074 /* Extended wait statuses aren't real SIGTRAPs. */
1075 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1078 debug_printf ("GPS: lwp %s had stopped with extended "
1079 "status: no pending signal\n",
1080 target_pid_to_str (ptid_of (thread
)));
1084 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1086 if (program_signals_p
&& !program_signals
[signo
])
1089 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1090 target_pid_to_str (ptid_of (thread
)),
1091 gdb_signal_to_string (signo
));
1094 else if (!program_signals_p
1095 /* If we have no way to know which signals GDB does not
1096 want to have passed to the program, assume
1097 SIGTRAP/SIGINT, which is GDB's default. */
1098 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1101 debug_printf ("GPS: lwp %s had signal %s, "
1102 "but we don't know if we should pass it. "
1103 "Default to not.\n",
1104 target_pid_to_str (ptid_of (thread
)),
1105 gdb_signal_to_string (signo
));
1111 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1112 target_pid_to_str (ptid_of (thread
)),
1113 gdb_signal_to_string (signo
));
1115 return WSTOPSIG (status
);
1120 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1122 struct thread_info
*thread
= (struct thread_info
*) entry
;
1123 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1124 int pid
= * (int *) args
;
1127 if (ptid_get_pid (entry
->id
) != pid
)
1130 /* If there is a pending SIGSTOP, get rid of it. */
1131 if (lwp
->stop_expected
)
1134 debug_printf ("Sending SIGCONT to %s\n",
1135 target_pid_to_str (ptid_of (thread
)));
1137 kill_lwp (lwpid_of (thread
), SIGCONT
);
1138 lwp
->stop_expected
= 0;
1141 /* Flush any pending changes to the process's registers. */
1142 regcache_invalidate_thread (thread
);
1144 /* Pass on any pending signal for this thread. */
1145 sig
= get_detach_signal (thread
);
1147 /* Finally, let it resume. */
1148 if (the_low_target
.prepare_to_resume
!= NULL
)
1149 the_low_target
.prepare_to_resume (lwp
);
1150 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1151 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1152 error (_("Can't detach %s: %s"),
1153 target_pid_to_str (ptid_of (thread
)),
1161 linux_detach (int pid
)
1163 struct process_info
*process
;
1165 process
= find_process_pid (pid
);
1166 if (process
== NULL
)
1169 /* Stop all threads before detaching. First, ptrace requires that
1170 the thread is stopped to sucessfully detach. Second, thread_db
1171 may need to uninstall thread event breakpoints from memory, which
1172 only works with a stopped process anyway. */
1173 stop_all_lwps (0, NULL
);
1175 #ifdef USE_THREAD_DB
1176 thread_db_detach (process
);
1179 /* Stabilize threads (move out of jump pads). */
1180 stabilize_threads ();
1182 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1184 the_target
->mourn (process
);
1186 /* Since we presently can only stop all lwps of all processes, we
1187 need to unstop lwps of other processes. */
1188 unstop_all_lwps (0, NULL
);
1192 /* Remove all LWPs that belong to process PROC from the lwp list. */
1195 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1197 struct thread_info
*thread
= (struct thread_info
*) entry
;
1198 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1199 struct process_info
*process
= proc
;
1201 if (pid_of (thread
) == pid_of (process
))
1208 linux_mourn (struct process_info
*process
)
1210 struct process_info_private
*priv
;
1212 #ifdef USE_THREAD_DB
1213 thread_db_mourn (process
);
1216 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1218 /* Freeing all private data. */
1219 priv
= process
->private;
1220 free (priv
->arch_private
);
1222 process
->private = NULL
;
1224 remove_process (process
);
1228 linux_join (int pid
)
1233 ret
= my_waitpid (pid
, &status
, 0);
1234 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1236 } while (ret
!= -1 || errno
!= ECHILD
);
1239 /* Return nonzero if the given thread is still alive. */
1241 linux_thread_alive (ptid_t ptid
)
1243 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1245 /* We assume we always know if a thread exits. If a whole process
1246 exited but we still haven't been able to report it to GDB, we'll
1247 hold on to the last lwp of the dead process. */
1254 /* Return 1 if this lwp still has an interesting status pending. If
1255 not (e.g., it had stopped for a breakpoint that is gone), return
1259 thread_still_has_status_pending_p (struct thread_info
*thread
)
1261 struct lwp_info
*lp
= get_thread_lwp (thread
);
1263 if (!lp
->status_pending_p
)
1266 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1267 report any status pending the LWP may have. */
1268 if (thread
->last_resume_kind
== resume_stop
1269 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1272 if (thread
->last_resume_kind
!= resume_stop
1273 && (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1274 || lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
))
1276 struct thread_info
*saved_thread
;
1280 gdb_assert (lp
->last_status
!= 0);
1284 saved_thread
= current_thread
;
1285 current_thread
= thread
;
1287 if (pc
!= lp
->stop_pc
)
1290 debug_printf ("PC of %ld changed\n",
1294 else if (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1295 && !(*the_low_target
.breakpoint_at
) (pc
))
1298 debug_printf ("previous SW breakpoint of %ld gone\n",
1302 else if (lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
1303 && !hardware_breakpoint_inserted_here (pc
))
1306 debug_printf ("previous HW breakpoint of %ld gone\n",
1311 current_thread
= saved_thread
;
1316 debug_printf ("discarding pending breakpoint status\n");
1317 lp
->status_pending_p
= 0;
1325 /* Return 1 if this lwp has an interesting status pending. */
1327 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1329 struct thread_info
*thread
= (struct thread_info
*) entry
;
1330 struct lwp_info
*lp
= get_thread_lwp (thread
);
1331 ptid_t ptid
= * (ptid_t
*) arg
;
1333 /* Check if we're only interested in events from a specific process
1335 if (!ptid_equal (minus_one_ptid
, ptid
)
1336 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1339 if (lp
->status_pending_p
1340 && !thread_still_has_status_pending_p (thread
))
1342 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1346 return lp
->status_pending_p
;
1350 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1352 ptid_t ptid
= *(ptid_t
*) data
;
1355 if (ptid_get_lwp (ptid
) != 0)
1356 lwp
= ptid_get_lwp (ptid
);
1358 lwp
= ptid_get_pid (ptid
);
1360 if (ptid_get_lwp (entry
->id
) == lwp
)
1367 find_lwp_pid (ptid_t ptid
)
1369 struct inferior_list_entry
*thread
1370 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1375 return get_thread_lwp ((struct thread_info
*) thread
);
1378 /* Return the number of known LWPs in the tgid given by PID. */
1383 struct inferior_list_entry
*inf
, *tmp
;
1386 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1388 if (ptid_get_pid (inf
->id
) == pid
)
1395 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1396 their exits until all other threads in the group have exited. */
1399 check_zombie_leaders (void)
1401 struct process_info
*proc
, *tmp
;
1403 ALL_PROCESSES (proc
, tmp
)
1405 pid_t leader_pid
= pid_of (proc
);
1406 struct lwp_info
*leader_lp
;
1408 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1411 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1412 "num_lwps=%d, zombie=%d\n",
1413 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1414 linux_proc_pid_is_zombie (leader_pid
));
1416 if (leader_lp
!= NULL
1417 /* Check if there are other threads in the group, as we may
1418 have raced with the inferior simply exiting. */
1419 && !last_thread_of_process_p (leader_pid
)
1420 && linux_proc_pid_is_zombie (leader_pid
))
1422 /* A leader zombie can mean one of two things:
1424 - It exited, and there's an exit status pending
1425 available, or only the leader exited (not the whole
1426 program). In the latter case, we can't waitpid the
1427 leader's exit status until all other threads are gone.
1429 - There are 3 or more threads in the group, and a thread
1430 other than the leader exec'd. On an exec, the Linux
1431 kernel destroys all other threads (except the execing
1432 one) in the thread group, and resets the execing thread's
1433 tid to the tgid. No exit notification is sent for the
1434 execing thread -- from the ptracer's perspective, it
1435 appears as though the execing thread just vanishes.
1436 Until we reap all other threads except the leader and the
1437 execing thread, the leader will be zombie, and the
1438 execing thread will be in `D (disc sleep)'. As soon as
1439 all other threads are reaped, the execing thread changes
1440 it's tid to the tgid, and the previous (zombie) leader
1441 vanishes, giving place to the "new" leader. We could try
1442 distinguishing the exit and exec cases, by waiting once
1443 more, and seeing if something comes out, but it doesn't
1444 sound useful. The previous leader _does_ go away, and
1445 we'll re-add the new one once we see the exec event
1446 (which is just the same as what would happen if the
1447 previous leader did exit voluntarily before some other
1452 "CZL: Thread group leader %d zombie "
1453 "(it exited, or another thread execd).\n",
1456 delete_lwp (leader_lp
);
1461 /* Callback for `find_inferior'. Returns the first LWP that is not
1462 stopped. ARG is a PTID filter. */
1465 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1467 struct thread_info
*thr
= (struct thread_info
*) entry
;
1468 struct lwp_info
*lwp
;
1469 ptid_t filter
= *(ptid_t
*) arg
;
1471 if (!ptid_match (ptid_of (thr
), filter
))
1474 lwp
= get_thread_lwp (thr
);
1481 /* This function should only be called if the LWP got a SIGTRAP.
1483 Handle any tracepoint steps or hits. Return true if a tracepoint
1484 event was handled, 0 otherwise. */
1487 handle_tracepoints (struct lwp_info
*lwp
)
1489 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1490 int tpoint_related_event
= 0;
1492 gdb_assert (lwp
->suspended
== 0);
1494 /* If this tracepoint hit causes a tracing stop, we'll immediately
1495 uninsert tracepoints. To do this, we temporarily pause all
1496 threads, unpatch away, and then unpause threads. We need to make
1497 sure the unpausing doesn't resume LWP too. */
1500 /* And we need to be sure that any all-threads-stopping doesn't try
1501 to move threads out of the jump pads, as it could deadlock the
1502 inferior (LWP could be in the jump pad, maybe even holding the
1505 /* Do any necessary step collect actions. */
1506 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1508 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1510 /* See if we just hit a tracepoint and do its main collect
1512 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1516 gdb_assert (lwp
->suspended
== 0);
1517 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1519 if (tpoint_related_event
)
1522 debug_printf ("got a tracepoint event\n");
1529 /* Convenience wrapper. Returns true if LWP is presently collecting a
1533 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1534 struct fast_tpoint_collect_status
*status
)
1536 CORE_ADDR thread_area
;
1537 struct thread_info
*thread
= get_lwp_thread (lwp
);
1539 if (the_low_target
.get_thread_area
== NULL
)
1542 /* Get the thread area address. This is used to recognize which
1543 thread is which when tracing with the in-process agent library.
1544 We don't read anything from the address, and treat it as opaque;
1545 it's the address itself that we assume is unique per-thread. */
1546 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1549 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1552 /* The reason we resume in the caller, is because we want to be able
1553 to pass lwp->status_pending as WSTAT, and we need to clear
1554 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1555 refuses to resume. */
1558 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1560 struct thread_info
*saved_thread
;
1562 saved_thread
= current_thread
;
1563 current_thread
= get_lwp_thread (lwp
);
1566 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1567 && supports_fast_tracepoints ()
1568 && agent_loaded_p ())
1570 struct fast_tpoint_collect_status status
;
1574 debug_printf ("Checking whether LWP %ld needs to move out of the "
1576 lwpid_of (current_thread
));
1578 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1581 || (WSTOPSIG (*wstat
) != SIGILL
1582 && WSTOPSIG (*wstat
) != SIGFPE
1583 && WSTOPSIG (*wstat
) != SIGSEGV
1584 && WSTOPSIG (*wstat
) != SIGBUS
))
1586 lwp
->collecting_fast_tracepoint
= r
;
1590 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1592 /* Haven't executed the original instruction yet.
1593 Set breakpoint there, and wait till it's hit,
1594 then single-step until exiting the jump pad. */
1595 lwp
->exit_jump_pad_bkpt
1596 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1600 debug_printf ("Checking whether LWP %ld needs to move out of "
1601 "the jump pad...it does\n",
1602 lwpid_of (current_thread
));
1603 current_thread
= saved_thread
;
1610 /* If we get a synchronous signal while collecting, *and*
1611 while executing the (relocated) original instruction,
1612 reset the PC to point at the tpoint address, before
1613 reporting to GDB. Otherwise, it's an IPA lib bug: just
1614 report the signal to GDB, and pray for the best. */
1616 lwp
->collecting_fast_tracepoint
= 0;
1619 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1620 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1623 struct regcache
*regcache
;
1625 /* The si_addr on a few signals references the address
1626 of the faulting instruction. Adjust that as
1628 if ((WSTOPSIG (*wstat
) == SIGILL
1629 || WSTOPSIG (*wstat
) == SIGFPE
1630 || WSTOPSIG (*wstat
) == SIGBUS
1631 || WSTOPSIG (*wstat
) == SIGSEGV
)
1632 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1633 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1634 /* Final check just to make sure we don't clobber
1635 the siginfo of non-kernel-sent signals. */
1636 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1638 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1639 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1640 (PTRACE_TYPE_ARG3
) 0, &info
);
1643 regcache
= get_thread_regcache (current_thread
, 1);
1644 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1645 lwp
->stop_pc
= status
.tpoint_addr
;
1647 /* Cancel any fast tracepoint lock this thread was
1649 force_unlock_trace_buffer ();
1652 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1655 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1656 "stopping all threads momentarily.\n");
1658 stop_all_lwps (1, lwp
);
1660 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1661 lwp
->exit_jump_pad_bkpt
= NULL
;
1663 unstop_all_lwps (1, lwp
);
1665 gdb_assert (lwp
->suspended
>= 0);
1671 debug_printf ("Checking whether LWP %ld needs to move out of the "
1673 lwpid_of (current_thread
));
1675 current_thread
= saved_thread
;
1679 /* Enqueue one signal in the "signals to report later when out of the
1683 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1685 struct pending_signals
*p_sig
;
1686 struct thread_info
*thread
= get_lwp_thread (lwp
);
1689 debug_printf ("Deferring signal %d for LWP %ld.\n",
1690 WSTOPSIG (*wstat
), lwpid_of (thread
));
1694 struct pending_signals
*sig
;
1696 for (sig
= lwp
->pending_signals_to_report
;
1699 debug_printf (" Already queued %d\n",
1702 debug_printf (" (no more currently queued signals)\n");
1705 /* Don't enqueue non-RT signals if they are already in the deferred
1706 queue. (SIGSTOP being the easiest signal to see ending up here
1708 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1710 struct pending_signals
*sig
;
1712 for (sig
= lwp
->pending_signals_to_report
;
1716 if (sig
->signal
== WSTOPSIG (*wstat
))
1719 debug_printf ("Not requeuing already queued non-RT signal %d"
1728 p_sig
= xmalloc (sizeof (*p_sig
));
1729 p_sig
->prev
= lwp
->pending_signals_to_report
;
1730 p_sig
->signal
= WSTOPSIG (*wstat
);
1731 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1732 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1735 lwp
->pending_signals_to_report
= p_sig
;
1738 /* Dequeue one signal from the "signals to report later when out of
1739 the jump pad" list. */
1742 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1744 struct thread_info
*thread
= get_lwp_thread (lwp
);
1746 if (lwp
->pending_signals_to_report
!= NULL
)
1748 struct pending_signals
**p_sig
;
1750 p_sig
= &lwp
->pending_signals_to_report
;
1751 while ((*p_sig
)->prev
!= NULL
)
1752 p_sig
= &(*p_sig
)->prev
;
1754 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1755 if ((*p_sig
)->info
.si_signo
!= 0)
1756 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1762 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1763 WSTOPSIG (*wstat
), lwpid_of (thread
));
1767 struct pending_signals
*sig
;
1769 for (sig
= lwp
->pending_signals_to_report
;
1772 debug_printf (" Still queued %d\n",
1775 debug_printf (" (no more queued signals)\n");
1784 /* Return true if the event in LP may be caused by breakpoint. */
1787 wstatus_maybe_breakpoint (int wstatus
)
1789 return (WIFSTOPPED (wstatus
)
1790 && (WSTOPSIG (wstatus
) == SIGTRAP
1791 /* SIGILL and SIGSEGV are also treated as traps in case a
1792 breakpoint is inserted at the current PC. */
1793 || WSTOPSIG (wstatus
) == SIGILL
1794 || WSTOPSIG (wstatus
) == SIGSEGV
));
1797 /* Fetch the possibly triggered data watchpoint info and store it in
1800 On some archs, like x86, that use debug registers to set
1801 watchpoints, it's possible that the way to know which watched
1802 address trapped, is to check the register that is used to select
1803 which address to watch. Problem is, between setting the watchpoint
1804 and reading back which data address trapped, the user may change
1805 the set of watchpoints, and, as a consequence, GDB changes the
1806 debug registers in the inferior. To avoid reading back a stale
1807 stopped-data-address when that happens, we cache in LP the fact
1808 that a watchpoint trapped, and the corresponding data address, as
1809 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1810 registers meanwhile, we have the cached data we can rely on. */
1813 check_stopped_by_watchpoint (struct lwp_info
*child
)
1815 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1817 struct thread_info
*saved_thread
;
1819 saved_thread
= current_thread
;
1820 current_thread
= get_lwp_thread (child
);
1822 if (the_low_target
.stopped_by_watchpoint ())
1824 child
->stop_reason
= LWP_STOPPED_BY_WATCHPOINT
;
1826 if (the_low_target
.stopped_data_address
!= NULL
)
1827 child
->stopped_data_address
1828 = the_low_target
.stopped_data_address ();
1830 child
->stopped_data_address
= 0;
1833 current_thread
= saved_thread
;
1836 return child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
1839 /* Do low-level handling of the event, and check if we should go on
1840 and pass it to caller code. Return the affected lwp if we are, or
1843 static struct lwp_info
*
1844 linux_low_filter_event (int lwpid
, int wstat
)
1846 struct lwp_info
*child
;
1847 struct thread_info
*thread
;
1848 int have_stop_pc
= 0;
1850 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1852 /* If we didn't find a process, one of two things presumably happened:
1853 - A process we started and then detached from has exited. Ignore it.
1854 - A process we are controlling has forked and the new child's stop
1855 was reported to us by the kernel. Save its PID. */
1856 if (child
== NULL
&& WIFSTOPPED (wstat
))
1858 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1861 else if (child
== NULL
)
1864 thread
= get_lwp_thread (child
);
1868 child
->last_status
= wstat
;
1870 /* Check if the thread has exited. */
1871 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1874 debug_printf ("LLFE: %d exited.\n", lwpid
);
1875 if (num_lwps (pid_of (thread
)) > 1)
1878 /* If there is at least one more LWP, then the exit signal was
1879 not the end of the debugged application and should be
1886 /* This was the last lwp in the process. Since events are
1887 serialized to GDB core, and we can't report this one
1888 right now, but GDB core and the other target layers will
1889 want to be notified about the exit code/signal, leave the
1890 status pending for the next time we're able to report
1892 mark_lwp_dead (child
, wstat
);
1897 gdb_assert (WIFSTOPPED (wstat
));
1899 if (WIFSTOPPED (wstat
))
1901 struct process_info
*proc
;
1903 /* Architecture-specific setup after inferior is running. This
1904 needs to happen after we have attached to the inferior and it
1905 is stopped for the first time, but before we access any
1906 inferior registers. */
1907 proc
= find_process_pid (pid_of (thread
));
1908 if (proc
->private->new_inferior
)
1910 struct thread_info
*saved_thread
;
1912 saved_thread
= current_thread
;
1913 current_thread
= thread
;
1915 the_low_target
.arch_setup ();
1917 current_thread
= saved_thread
;
1919 proc
->private->new_inferior
= 0;
1923 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1925 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1927 linux_enable_event_reporting (lwpid
, proc
->attached
);
1928 child
->must_set_ptrace_flags
= 0;
1931 /* Be careful to not overwrite stop_pc until
1932 check_stopped_by_breakpoint is called. */
1933 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1934 && linux_is_extended_waitstatus (wstat
))
1936 child
->stop_pc
= get_pc (child
);
1937 handle_extended_wait (child
, wstat
);
1941 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1942 && check_stopped_by_watchpoint (child
))
1944 else if (WIFSTOPPED (wstat
) && wstatus_maybe_breakpoint (wstat
))
1946 if (check_stopped_by_breakpoint (child
))
1951 child
->stop_pc
= get_pc (child
);
1953 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1954 && child
->stop_expected
)
1957 debug_printf ("Expected stop.\n");
1958 child
->stop_expected
= 0;
1960 if (thread
->last_resume_kind
== resume_stop
)
1962 /* We want to report the stop to the core. Treat the
1963 SIGSTOP as a normal event. */
1965 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1967 /* Stopping threads. We don't want this SIGSTOP to end up
1973 /* Filter out the event. */
1974 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1979 child
->status_pending_p
= 1;
1980 child
->status_pending
= wstat
;
1984 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1985 match FILTER_PTID (leaving others pending). The PTIDs can be:
1986 minus_one_ptid, to specify any child; a pid PTID, specifying all
1987 lwps of a thread group; or a PTID representing a single lwp. Store
1988 the stop status through the status pointer WSTAT. OPTIONS is
1989 passed to the waitpid call. Return 0 if no event was found and
1990 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1991 was found. Return the PID of the stopped child otherwise. */
1994 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1995 int *wstatp
, int options
)
1997 struct thread_info
*event_thread
;
1998 struct lwp_info
*event_child
, *requested_child
;
1999 sigset_t block_mask
, prev_mask
;
2002 /* N.B. event_thread points to the thread_info struct that contains
2003 event_child. Keep them in sync. */
2004 event_thread
= NULL
;
2006 requested_child
= NULL
;
2008 /* Check for a lwp with a pending status. */
2010 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2012 event_thread
= (struct thread_info
*)
2013 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2014 if (event_thread
!= NULL
)
2015 event_child
= get_thread_lwp (event_thread
);
2016 if (debug_threads
&& event_thread
)
2017 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2019 else if (!ptid_equal (filter_ptid
, null_ptid
))
2021 requested_child
= find_lwp_pid (filter_ptid
);
2023 if (stopping_threads
== NOT_STOPPING_THREADS
2024 && requested_child
->status_pending_p
2025 && requested_child
->collecting_fast_tracepoint
)
2027 enqueue_one_deferred_signal (requested_child
,
2028 &requested_child
->status_pending
);
2029 requested_child
->status_pending_p
= 0;
2030 requested_child
->status_pending
= 0;
2031 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2034 if (requested_child
->suspended
2035 && requested_child
->status_pending_p
)
2037 internal_error (__FILE__
, __LINE__
,
2038 "requesting an event out of a"
2039 " suspended child?");
2042 if (requested_child
->status_pending_p
)
2044 event_child
= requested_child
;
2045 event_thread
= get_lwp_thread (event_child
);
2049 if (event_child
!= NULL
)
2052 debug_printf ("Got an event from pending child %ld (%04x)\n",
2053 lwpid_of (event_thread
), event_child
->status_pending
);
2054 *wstatp
= event_child
->status_pending
;
2055 event_child
->status_pending_p
= 0;
2056 event_child
->status_pending
= 0;
2057 current_thread
= event_thread
;
2058 return lwpid_of (event_thread
);
2061 /* But if we don't find a pending event, we'll have to wait.
2063 We only enter this loop if no process has a pending wait status.
2064 Thus any action taken in response to a wait status inside this
2065 loop is responding as soon as we detect the status, not after any
2068 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2069 all signals while here. */
2070 sigfillset (&block_mask
);
2071 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2073 /* Always pull all events out of the kernel. We'll randomly select
2074 an event LWP out of all that have events, to prevent
2076 while (event_child
== NULL
)
2080 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2083 - If the thread group leader exits while other threads in the
2084 thread group still exist, waitpid(TGID, ...) hangs. That
2085 waitpid won't return an exit status until the other threads
2086 in the group are reaped.
2088 - When a non-leader thread execs, that thread just vanishes
2089 without reporting an exit (so we'd hang if we waited for it
2090 explicitly in that case). The exec event is reported to
2091 the TGID pid (although we don't currently enable exec
2094 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2097 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2098 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2104 debug_printf ("LLW: waitpid %ld received %s\n",
2105 (long) ret
, status_to_str (*wstatp
));
2108 /* Filter all events. IOW, leave all events pending. We'll
2109 randomly select an event LWP out of all that have events
2111 linux_low_filter_event (ret
, *wstatp
);
2112 /* Retry until nothing comes out of waitpid. A single
2113 SIGCHLD can indicate more than one child stopped. */
2117 /* Now that we've pulled all events out of the kernel, check if
2118 there's any LWP with a status to report to the core. */
2119 event_thread
= (struct thread_info
*)
2120 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2121 if (event_thread
!= NULL
)
2123 event_child
= get_thread_lwp (event_thread
);
2124 *wstatp
= event_child
->status_pending
;
2125 event_child
->status_pending_p
= 0;
2126 event_child
->status_pending
= 0;
2130 /* Check for zombie thread group leaders. Those can't be reaped
2131 until all other threads in the thread group are. */
2132 check_zombie_leaders ();
2134 /* If there are no resumed children left in the set of LWPs we
2135 want to wait for, bail. We can't just block in
2136 waitpid/sigsuspend, because lwps might have been left stopped
2137 in trace-stop state, and we'd be stuck forever waiting for
2138 their status to change (which would only happen if we resumed
2139 them). Even if WNOHANG is set, this return code is preferred
2140 over 0 (below), as it is more detailed. */
2141 if ((find_inferior (&all_threads
,
2142 not_stopped_callback
,
2143 &wait_ptid
) == NULL
))
2146 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2147 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2151 /* No interesting event to report to the caller. */
2152 if ((options
& WNOHANG
))
2155 debug_printf ("WNOHANG set, no event found\n");
2157 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2161 /* Block until we get an event reported with SIGCHLD. */
2163 debug_printf ("sigsuspend'ing\n");
2165 sigsuspend (&prev_mask
);
2166 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2170 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2172 current_thread
= event_thread
;
2174 /* Check for thread exit. */
2175 if (! WIFSTOPPED (*wstatp
))
2177 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2180 debug_printf ("LWP %d is the last lwp of process. "
2181 "Process %ld exiting.\n",
2182 pid_of (event_thread
), lwpid_of (event_thread
));
2183 return lwpid_of (event_thread
);
2186 return lwpid_of (event_thread
);
2189 /* Wait for an event from child(ren) PTID. PTIDs can be:
2190 minus_one_ptid, to specify any child; a pid PTID, specifying all
2191 lwps of a thread group; or a PTID representing a single lwp. Store
2192 the stop status through the status pointer WSTAT. OPTIONS is
2193 passed to the waitpid call. Return 0 if no event was found and
2194 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2195 was found. Return the PID of the stopped child otherwise. */
2198 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2200 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2203 /* Count the LWP's that have had events. */
2206 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2208 struct thread_info
*thread
= (struct thread_info
*) entry
;
2211 gdb_assert (count
!= NULL
);
2213 /* Count only resumed LWPs that have an event pending. */
2214 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2215 && thread
->last_resume_kind
!= resume_stop
2216 && thread
->status_pending_p
)
2222 /* Select the LWP (if any) that is currently being single-stepped. */
2225 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2227 struct thread_info
*thread
= (struct thread_info
*) entry
;
2228 struct lwp_info
*lp
= get_thread_lwp (thread
);
2230 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2231 && thread
->last_resume_kind
== resume_step
2232 && lp
->status_pending_p
)
2238 /* Select the Nth LWP that has had a SIGTRAP event that should be
2242 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2244 struct thread_info
*thread
= (struct thread_info
*) entry
;
2245 int *selector
= data
;
2247 gdb_assert (selector
!= NULL
);
2249 /* Select only resumed LWPs that have an event pending. */
2250 if (thread
->last_resume_kind
!= resume_stop
2251 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2252 && thread
->status_pending_p
)
2253 if ((*selector
)-- == 0)
2259 /* Select one LWP out of those that have events pending. */
2262 select_event_lwp (struct lwp_info
**orig_lp
)
2265 int random_selector
;
2266 struct thread_info
*event_thread
= NULL
;
2268 /* In all-stop, give preference to the LWP that is being
2269 single-stepped. There will be at most one, and it's the LWP that
2270 the core is most interested in. If we didn't do this, then we'd
2271 have to handle pending step SIGTRAPs somehow in case the core
2272 later continues the previously-stepped thread, otherwise we'd
2273 report the pending SIGTRAP, and the core, not having stepped the
2274 thread, wouldn't understand what the trap was for, and therefore
2275 would report it to the user as a random signal. */
2279 = (struct thread_info
*) find_inferior (&all_threads
,
2280 select_singlestep_lwp_callback
,
2282 if (event_thread
!= NULL
)
2285 debug_printf ("SEL: Select single-step %s\n",
2286 target_pid_to_str (ptid_of (event_thread
)));
2289 if (event_thread
== NULL
)
2291 /* No single-stepping LWP. Select one at random, out of those
2292 which have had SIGTRAP events. */
2294 /* First see how many SIGTRAP events we have. */
2295 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2297 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2298 random_selector
= (int)
2299 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2301 if (debug_threads
&& num_events
> 1)
2302 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2303 num_events
, random_selector
);
2306 = (struct thread_info
*) find_inferior (&all_threads
,
2307 select_event_lwp_callback
,
2311 if (event_thread
!= NULL
)
2313 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2315 /* Switch the event LWP. */
2316 *orig_lp
= event_lp
;
2320 /* Decrement the suspend count of an LWP. */
2323 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2325 struct thread_info
*thread
= (struct thread_info
*) entry
;
2326 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2328 /* Ignore EXCEPT. */
2334 gdb_assert (lwp
->suspended
>= 0);
2338 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2342 unsuspend_all_lwps (struct lwp_info
*except
)
2344 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2347 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2348 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2350 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2351 static ptid_t
linux_wait_1 (ptid_t ptid
,
2352 struct target_waitstatus
*ourstatus
,
2353 int target_options
);
2355 /* Stabilize threads (move out of jump pads).
2357 If a thread is midway collecting a fast tracepoint, we need to
2358 finish the collection and move it out of the jump pad before
2359 reporting the signal.
2361 This avoids recursion while collecting (when a signal arrives
2362 midway, and the signal handler itself collects), which would trash
2363 the trace buffer. In case the user set a breakpoint in a signal
2364 handler, this avoids the backtrace showing the jump pad, etc..
2365 Most importantly, there are certain things we can't do safely if
2366 threads are stopped in a jump pad (or in its callee's). For
2369 - starting a new trace run. A thread still collecting the
2370 previous run, could trash the trace buffer when resumed. The trace
2371 buffer control structures would have been reset but the thread had
2372 no way to tell. The thread could even midway memcpy'ing to the
2373 buffer, which would mean that when resumed, it would clobber the
2374 trace buffer that had been set for a new run.
2376 - we can't rewrite/reuse the jump pads for new tracepoints
2377 safely. Say you do tstart while a thread is stopped midway while
2378 collecting. When the thread is later resumed, it finishes the
2379 collection, and returns to the jump pad, to execute the original
2380 instruction that was under the tracepoint jump at the time the
2381 older run had been started. If the jump pad had been rewritten
2382 since for something else in the new run, the thread would now
2383 execute the wrong / random instructions. */
2386 linux_stabilize_threads (void)
2388 struct thread_info
*saved_thread
;
2389 struct thread_info
*thread_stuck
;
2392 = (struct thread_info
*) find_inferior (&all_threads
,
2393 stuck_in_jump_pad_callback
,
2395 if (thread_stuck
!= NULL
)
2398 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2399 lwpid_of (thread_stuck
));
2403 saved_thread
= current_thread
;
2405 stabilizing_threads
= 1;
2408 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2410 /* Loop until all are stopped out of the jump pads. */
2411 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2413 struct target_waitstatus ourstatus
;
2414 struct lwp_info
*lwp
;
2417 /* Note that we go through the full wait even loop. While
2418 moving threads out of jump pad, we need to be able to step
2419 over internal breakpoints and such. */
2420 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2422 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2424 lwp
= get_thread_lwp (current_thread
);
2429 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2430 || current_thread
->last_resume_kind
== resume_stop
)
2432 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2433 enqueue_one_deferred_signal (lwp
, &wstat
);
2438 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2440 stabilizing_threads
= 0;
2442 current_thread
= saved_thread
;
2447 = (struct thread_info
*) find_inferior (&all_threads
,
2448 stuck_in_jump_pad_callback
,
2450 if (thread_stuck
!= NULL
)
2451 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2452 lwpid_of (thread_stuck
));
2456 static void async_file_mark (void);
2458 /* Convenience function that is called when the kernel reports an
2459 event that is not passed out to GDB. */
2462 ignore_event (struct target_waitstatus
*ourstatus
)
2464 /* If we got an event, there may still be others, as a single
2465 SIGCHLD can indicate more than one child stopped. This forces
2466 another target_wait call. */
2469 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2473 /* Wait for process, returns status. */
2476 linux_wait_1 (ptid_t ptid
,
2477 struct target_waitstatus
*ourstatus
, int target_options
)
2480 struct lwp_info
*event_child
;
2483 int step_over_finished
;
2484 int bp_explains_trap
;
2485 int maybe_internal_trap
;
2493 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2496 /* Translate generic target options into linux options. */
2498 if (target_options
& TARGET_WNOHANG
)
2501 bp_explains_trap
= 0;
2504 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2506 if (ptid_equal (step_over_bkpt
, null_ptid
))
2507 pid
= linux_wait_for_event (ptid
, &w
, options
);
2511 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2512 target_pid_to_str (step_over_bkpt
));
2513 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2518 gdb_assert (target_options
& TARGET_WNOHANG
);
2522 debug_printf ("linux_wait_1 ret = null_ptid, "
2523 "TARGET_WAITKIND_IGNORE\n");
2527 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2534 debug_printf ("linux_wait_1 ret = null_ptid, "
2535 "TARGET_WAITKIND_NO_RESUMED\n");
2539 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2543 event_child
= get_thread_lwp (current_thread
);
2545 /* linux_wait_for_event only returns an exit status for the last
2546 child of a process. Report it. */
2547 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2551 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2552 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2556 debug_printf ("linux_wait_1 ret = %s, exited with "
2558 target_pid_to_str (ptid_of (current_thread
)),
2565 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2566 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2570 debug_printf ("linux_wait_1 ret = %s, terminated with "
2572 target_pid_to_str (ptid_of (current_thread
)),
2578 return ptid_of (current_thread
);
2581 /* If this event was not handled before, and is not a SIGTRAP, we
2582 report it. SIGILL and SIGSEGV are also treated as traps in case
2583 a breakpoint is inserted at the current PC. If this target does
2584 not support internal breakpoints at all, we also report the
2585 SIGTRAP without further processing; it's of no concern to us. */
2587 = (supports_breakpoints ()
2588 && (WSTOPSIG (w
) == SIGTRAP
2589 || ((WSTOPSIG (w
) == SIGILL
2590 || WSTOPSIG (w
) == SIGSEGV
)
2591 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2593 if (maybe_internal_trap
)
2595 /* Handle anything that requires bookkeeping before deciding to
2596 report the event or continue waiting. */
2598 /* First check if we can explain the SIGTRAP with an internal
2599 breakpoint, or if we should possibly report the event to GDB.
2600 Do this before anything that may remove or insert a
2602 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2604 /* We have a SIGTRAP, possibly a step-over dance has just
2605 finished. If so, tweak the state machine accordingly,
2606 reinsert breakpoints and delete any reinsert (software
2607 single-step) breakpoints. */
2608 step_over_finished
= finish_step_over (event_child
);
2610 /* Now invoke the callbacks of any internal breakpoints there. */
2611 check_breakpoints (event_child
->stop_pc
);
2613 /* Handle tracepoint data collecting. This may overflow the
2614 trace buffer, and cause a tracing stop, removing
2616 trace_event
= handle_tracepoints (event_child
);
2618 if (bp_explains_trap
)
2620 /* If we stepped or ran into an internal breakpoint, we've
2621 already handled it. So next time we resume (from this
2622 PC), we should step over it. */
2624 debug_printf ("Hit a gdbserver breakpoint.\n");
2626 if (breakpoint_here (event_child
->stop_pc
))
2627 event_child
->need_step_over
= 1;
2632 /* We have some other signal, possibly a step-over dance was in
2633 progress, and it should be cancelled too. */
2634 step_over_finished
= finish_step_over (event_child
);
2637 /* We have all the data we need. Either report the event to GDB, or
2638 resume threads and keep waiting for more. */
2640 /* If we're collecting a fast tracepoint, finish the collection and
2641 move out of the jump pad before delivering a signal. See
2642 linux_stabilize_threads. */
2645 && WSTOPSIG (w
) != SIGTRAP
2646 && supports_fast_tracepoints ()
2647 && agent_loaded_p ())
2650 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2651 "to defer or adjust it.\n",
2652 WSTOPSIG (w
), lwpid_of (current_thread
));
2654 /* Allow debugging the jump pad itself. */
2655 if (current_thread
->last_resume_kind
!= resume_step
2656 && maybe_move_out_of_jump_pad (event_child
, &w
))
2658 enqueue_one_deferred_signal (event_child
, &w
);
2661 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2662 WSTOPSIG (w
), lwpid_of (current_thread
));
2664 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2666 return ignore_event (ourstatus
);
2670 if (event_child
->collecting_fast_tracepoint
)
2673 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2674 "Check if we're already there.\n",
2675 lwpid_of (current_thread
),
2676 event_child
->collecting_fast_tracepoint
);
2680 event_child
->collecting_fast_tracepoint
2681 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2683 if (event_child
->collecting_fast_tracepoint
!= 1)
2685 /* No longer need this breakpoint. */
2686 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2689 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2690 "stopping all threads momentarily.\n");
2692 /* Other running threads could hit this breakpoint.
2693 We don't handle moribund locations like GDB does,
2694 instead we always pause all threads when removing
2695 breakpoints, so that any step-over or
2696 decr_pc_after_break adjustment is always taken
2697 care of while the breakpoint is still
2699 stop_all_lwps (1, event_child
);
2701 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2702 event_child
->exit_jump_pad_bkpt
= NULL
;
2704 unstop_all_lwps (1, event_child
);
2706 gdb_assert (event_child
->suspended
>= 0);
2710 if (event_child
->collecting_fast_tracepoint
== 0)
2713 debug_printf ("fast tracepoint finished "
2714 "collecting successfully.\n");
2716 /* We may have a deferred signal to report. */
2717 if (dequeue_one_deferred_signal (event_child
, &w
))
2720 debug_printf ("dequeued one signal.\n");
2725 debug_printf ("no deferred signals.\n");
2727 if (stabilizing_threads
)
2729 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2730 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2734 debug_printf ("linux_wait_1 ret = %s, stopped "
2735 "while stabilizing threads\n",
2736 target_pid_to_str (ptid_of (current_thread
)));
2740 return ptid_of (current_thread
);
2746 /* Check whether GDB would be interested in this event. */
2748 /* If GDB is not interested in this signal, don't stop other
2749 threads, and don't report it to GDB. Just resume the inferior
2750 right away. We do this for threading-related signals as well as
2751 any that GDB specifically requested we ignore. But never ignore
2752 SIGSTOP if we sent it ourselves, and do not ignore signals when
2753 stepping - they may require special handling to skip the signal
2755 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2758 && current_thread
->last_resume_kind
!= resume_step
2760 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2761 (current_process ()->private->thread_db
!= NULL
2762 && (WSTOPSIG (w
) == __SIGRTMIN
2763 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2766 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2767 && !(WSTOPSIG (w
) == SIGSTOP
2768 && current_thread
->last_resume_kind
== resume_stop
))))
2770 siginfo_t info
, *info_p
;
2773 debug_printf ("Ignored signal %d for LWP %ld.\n",
2774 WSTOPSIG (w
), lwpid_of (current_thread
));
2776 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2777 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2781 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2782 WSTOPSIG (w
), info_p
);
2783 return ignore_event (ourstatus
);
2786 /* Note that all addresses are always "out of the step range" when
2787 there's no range to begin with. */
2788 in_step_range
= lwp_in_step_range (event_child
);
2790 /* If GDB wanted this thread to single step, and the thread is out
2791 of the step range, we always want to report the SIGTRAP, and let
2792 GDB handle it. Watchpoints should always be reported. So should
2793 signals we can't explain. A SIGTRAP we can't explain could be a
2794 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2795 do, we're be able to handle GDB breakpoints on top of internal
2796 breakpoints, by handling the internal breakpoint and still
2797 reporting the event to GDB. If we don't, we're out of luck, GDB
2798 won't see the breakpoint hit. */
2799 report_to_gdb
= (!maybe_internal_trap
2800 || (current_thread
->last_resume_kind
== resume_step
2802 || event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
2803 || (!step_over_finished
&& !in_step_range
2804 && !bp_explains_trap
&& !trace_event
)
2805 || (gdb_breakpoint_here (event_child
->stop_pc
)
2806 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2807 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2809 run_breakpoint_commands (event_child
->stop_pc
);
2811 /* We found no reason GDB would want us to stop. We either hit one
2812 of our own breakpoints, or finished an internal step GDB
2813 shouldn't know about. */
2818 if (bp_explains_trap
)
2819 debug_printf ("Hit a gdbserver breakpoint.\n");
2820 if (step_over_finished
)
2821 debug_printf ("Step-over finished.\n");
2823 debug_printf ("Tracepoint event.\n");
2824 if (lwp_in_step_range (event_child
))
2825 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2826 paddress (event_child
->stop_pc
),
2827 paddress (event_child
->step_range_start
),
2828 paddress (event_child
->step_range_end
));
2831 /* We're not reporting this breakpoint to GDB, so apply the
2832 decr_pc_after_break adjustment to the inferior's regcache
2835 if (the_low_target
.set_pc
!= NULL
)
2837 struct regcache
*regcache
2838 = get_thread_regcache (current_thread
, 1);
2839 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2842 /* We may have finished stepping over a breakpoint. If so,
2843 we've stopped and suspended all LWPs momentarily except the
2844 stepping one. This is where we resume them all again. We're
2845 going to keep waiting, so use proceed, which handles stepping
2846 over the next breakpoint. */
2848 debug_printf ("proceeding all threads.\n");
2850 if (step_over_finished
)
2851 unsuspend_all_lwps (event_child
);
2853 proceed_all_lwps ();
2854 return ignore_event (ourstatus
);
2859 if (current_thread
->last_resume_kind
== resume_step
)
2861 if (event_child
->step_range_start
== event_child
->step_range_end
)
2862 debug_printf ("GDB wanted to single-step, reporting event.\n");
2863 else if (!lwp_in_step_range (event_child
))
2864 debug_printf ("Out of step range, reporting event.\n");
2866 if (event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
)
2867 debug_printf ("Stopped by watchpoint.\n");
2868 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2869 debug_printf ("Stopped by GDB breakpoint.\n");
2871 debug_printf ("Hit a non-gdbserver trap event.\n");
2874 /* Alright, we're going to report a stop. */
2876 if (!stabilizing_threads
)
2878 /* In all-stop, stop all threads. */
2880 stop_all_lwps (0, NULL
);
2882 /* If we're not waiting for a specific LWP, choose an event LWP
2883 from among those that have had events. Giving equal priority
2884 to all LWPs that have had events helps prevent
2886 if (ptid_equal (ptid
, minus_one_ptid
))
2888 event_child
->status_pending_p
= 1;
2889 event_child
->status_pending
= w
;
2891 select_event_lwp (&event_child
);
2893 /* current_thread and event_child must stay in sync. */
2894 current_thread
= get_lwp_thread (event_child
);
2896 event_child
->status_pending_p
= 0;
2897 w
= event_child
->status_pending
;
2900 if (step_over_finished
)
2904 /* If we were doing a step-over, all other threads but
2905 the stepping one had been paused in start_step_over,
2906 with their suspend counts incremented. We don't want
2907 to do a full unstop/unpause, because we're in
2908 all-stop mode (so we want threads stopped), but we
2909 still need to unsuspend the other threads, to
2910 decrement their `suspended' count back. */
2911 unsuspend_all_lwps (event_child
);
2915 /* If we just finished a step-over, then all threads had
2916 been momentarily paused. In all-stop, that's fine,
2917 we want threads stopped by now anyway. In non-stop,
2918 we need to re-resume threads that GDB wanted to be
2920 unstop_all_lwps (1, event_child
);
2924 /* Stabilize threads (move out of jump pads). */
2926 stabilize_threads ();
2930 /* If we just finished a step-over, then all threads had been
2931 momentarily paused. In all-stop, that's fine, we want
2932 threads stopped by now anyway. In non-stop, we need to
2933 re-resume threads that GDB wanted to be running. */
2934 if (step_over_finished
)
2935 unstop_all_lwps (1, event_child
);
2938 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2940 /* Now that we've selected our final event LWP, un-adjust its PC if
2941 it was a software breakpoint. */
2942 if (event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2944 int decr_pc
= the_low_target
.decr_pc_after_break
;
2948 struct regcache
*regcache
2949 = get_thread_regcache (current_thread
, 1);
2950 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
2954 if (current_thread
->last_resume_kind
== resume_stop
2955 && WSTOPSIG (w
) == SIGSTOP
)
2957 /* A thread that has been requested to stop by GDB with vCont;t,
2958 and it stopped cleanly, so report as SIG0. The use of
2959 SIGSTOP is an implementation detail. */
2960 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2962 else if (current_thread
->last_resume_kind
== resume_stop
2963 && WSTOPSIG (w
) != SIGSTOP
)
2965 /* A thread that has been requested to stop by GDB with vCont;t,
2966 but, it stopped for other reasons. */
2967 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2971 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2974 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2978 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2979 target_pid_to_str (ptid_of (current_thread
)),
2980 ourstatus
->kind
, ourstatus
->value
.sig
);
2984 return ptid_of (current_thread
);
2987 /* Get rid of any pending event in the pipe. */
2989 async_file_flush (void)
2995 ret
= read (linux_event_pipe
[0], &buf
, 1);
2996 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2999 /* Put something in the pipe, so the event loop wakes up. */
3001 async_file_mark (void)
3005 async_file_flush ();
3008 ret
= write (linux_event_pipe
[1], "+", 1);
3009 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3011 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3012 be awakened anyway. */
3016 linux_wait (ptid_t ptid
,
3017 struct target_waitstatus
*ourstatus
, int target_options
)
3021 /* Flush the async file first. */
3022 if (target_is_async_p ())
3023 async_file_flush ();
3027 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3029 while ((target_options
& TARGET_WNOHANG
) == 0
3030 && ptid_equal (event_ptid
, null_ptid
)
3031 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3033 /* If at least one stop was reported, there may be more. A single
3034 SIGCHLD can signal more than one child stop. */
3035 if (target_is_async_p ()
3036 && (target_options
& TARGET_WNOHANG
) != 0
3037 && !ptid_equal (event_ptid
, null_ptid
))
3043 /* Send a signal to an LWP. */
3046 kill_lwp (unsigned long lwpid
, int signo
)
3048 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3049 fails, then we are not using nptl threads and we should be using kill. */
3053 static int tkill_failed
;
3060 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3061 if (errno
!= ENOSYS
)
3068 return kill (lwpid
, signo
);
3072 linux_stop_lwp (struct lwp_info
*lwp
)
3078 send_sigstop (struct lwp_info
*lwp
)
3082 pid
= lwpid_of (get_lwp_thread (lwp
));
3084 /* If we already have a pending stop signal for this process, don't
3086 if (lwp
->stop_expected
)
3089 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3095 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3097 lwp
->stop_expected
= 1;
3098 kill_lwp (pid
, SIGSTOP
);
3102 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3104 struct thread_info
*thread
= (struct thread_info
*) entry
;
3105 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3107 /* Ignore EXCEPT. */
3118 /* Increment the suspend count of an LWP, and stop it, if not stopped
3121 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3124 struct thread_info
*thread
= (struct thread_info
*) entry
;
3125 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3127 /* Ignore EXCEPT. */
3133 return send_sigstop_callback (entry
, except
);
3137 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3139 /* It's dead, really. */
3142 /* Store the exit status for later. */
3143 lwp
->status_pending_p
= 1;
3144 lwp
->status_pending
= wstat
;
3146 /* Prevent trying to stop it. */
3149 /* No further stops are expected from a dead lwp. */
3150 lwp
->stop_expected
= 0;
3153 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3156 wait_for_sigstop (void)
3158 struct thread_info
*saved_thread
;
3163 saved_thread
= current_thread
;
3164 if (saved_thread
!= NULL
)
3165 saved_tid
= saved_thread
->entry
.id
;
3167 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3170 debug_printf ("wait_for_sigstop: pulling events\n");
3172 /* Passing NULL_PTID as filter indicates we want all events to be
3173 left pending. Eventually this returns when there are no
3174 unwaited-for children left. */
3175 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3177 gdb_assert (ret
== -1);
3179 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3180 current_thread
= saved_thread
;
3184 debug_printf ("Previously current thread died.\n");
3188 /* We can't change the current inferior behind GDB's back,
3189 otherwise, a subsequent command may apply to the wrong
3191 current_thread
= NULL
;
3195 /* Set a valid thread as current. */
3196 set_desired_thread (0);
3201 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3202 move it out, because we need to report the stop event to GDB. For
3203 example, if the user puts a breakpoint in the jump pad, it's
3204 because she wants to debug it. */
3207 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3209 struct thread_info
*thread
= (struct thread_info
*) entry
;
3210 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3212 gdb_assert (lwp
->suspended
== 0);
3213 gdb_assert (lwp
->stopped
);
3215 /* Allow debugging the jump pad, gdb_collect, etc.. */
3216 return (supports_fast_tracepoints ()
3217 && agent_loaded_p ()
3218 && (gdb_breakpoint_here (lwp
->stop_pc
)
3219 || lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
3220 || thread
->last_resume_kind
== resume_step
)
3221 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3225 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3227 struct thread_info
*thread
= (struct thread_info
*) entry
;
3228 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3231 gdb_assert (lwp
->suspended
== 0);
3232 gdb_assert (lwp
->stopped
);
3234 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3236 /* Allow debugging the jump pad, gdb_collect, etc. */
3237 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3238 && lwp
->stop_reason
!= LWP_STOPPED_BY_WATCHPOINT
3239 && thread
->last_resume_kind
!= resume_step
3240 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3243 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3248 lwp
->status_pending_p
= 0;
3249 enqueue_one_deferred_signal (lwp
, wstat
);
3252 debug_printf ("Signal %d for LWP %ld deferred "
3254 WSTOPSIG (*wstat
), lwpid_of (thread
));
3257 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3264 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3266 struct thread_info
*thread
= (struct thread_info
*) entry
;
3267 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3276 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3277 If SUSPEND, then also increase the suspend count of every LWP,
3281 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3283 /* Should not be called recursively. */
3284 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3289 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3290 suspend
? "stop-and-suspend" : "stop",
3292 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3296 stopping_threads
= (suspend
3297 ? STOPPING_AND_SUSPENDING_THREADS
3298 : STOPPING_THREADS
);
3301 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3303 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3304 wait_for_sigstop ();
3305 stopping_threads
= NOT_STOPPING_THREADS
;
3309 debug_printf ("stop_all_lwps done, setting stopping_threads "
3310 "back to !stopping\n");
3315 /* Resume execution of the inferior process.
3316 If STEP is nonzero, single-step it.
3317 If SIGNAL is nonzero, give it that signal. */
3320 linux_resume_one_lwp (struct lwp_info
*lwp
,
3321 int step
, int signal
, siginfo_t
*info
)
3323 struct thread_info
*thread
= get_lwp_thread (lwp
);
3324 struct thread_info
*saved_thread
;
3325 int fast_tp_collecting
;
3327 if (lwp
->stopped
== 0)
3330 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3332 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3334 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3335 user used the "jump" command, or "set $pc = foo"). */
3336 if (lwp
->stop_pc
!= get_pc (lwp
))
3338 /* Collecting 'while-stepping' actions doesn't make sense
3340 release_while_stepping_state_list (thread
);
3343 /* If we have pending signals or status, and a new signal, enqueue the
3344 signal. Also enqueue the signal if we are waiting to reinsert a
3345 breakpoint; it will be picked up again below. */
3347 && (lwp
->status_pending_p
3348 || lwp
->pending_signals
!= NULL
3349 || lwp
->bp_reinsert
!= 0
3350 || fast_tp_collecting
))
3352 struct pending_signals
*p_sig
;
3353 p_sig
= xmalloc (sizeof (*p_sig
));
3354 p_sig
->prev
= lwp
->pending_signals
;
3355 p_sig
->signal
= signal
;
3357 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3359 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3360 lwp
->pending_signals
= p_sig
;
3363 if (lwp
->status_pending_p
)
3366 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3367 " has pending status\n",
3368 lwpid_of (thread
), step
? "step" : "continue", signal
,
3369 lwp
->stop_expected
? "expected" : "not expected");
3373 saved_thread
= current_thread
;
3374 current_thread
= thread
;
3377 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3378 lwpid_of (thread
), step
? "step" : "continue", signal
,
3379 lwp
->stop_expected
? "expected" : "not expected");
3381 /* This bit needs some thinking about. If we get a signal that
3382 we must report while a single-step reinsert is still pending,
3383 we often end up resuming the thread. It might be better to
3384 (ew) allow a stack of pending events; then we could be sure that
3385 the reinsert happened right away and not lose any signals.
3387 Making this stack would also shrink the window in which breakpoints are
3388 uninserted (see comment in linux_wait_for_lwp) but not enough for
3389 complete correctness, so it won't solve that problem. It may be
3390 worthwhile just to solve this one, however. */
3391 if (lwp
->bp_reinsert
!= 0)
3394 debug_printf (" pending reinsert at 0x%s\n",
3395 paddress (lwp
->bp_reinsert
));
3397 if (can_hardware_single_step ())
3399 if (fast_tp_collecting
== 0)
3402 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3404 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3411 /* Postpone any pending signal. It was enqueued above. */
3415 if (fast_tp_collecting
== 1)
3418 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3419 " (exit-jump-pad-bkpt)\n",
3422 /* Postpone any pending signal. It was enqueued above. */
3425 else if (fast_tp_collecting
== 2)
3428 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3429 " single-stepping\n",
3432 if (can_hardware_single_step ())
3436 internal_error (__FILE__
, __LINE__
,
3437 "moving out of jump pad single-stepping"
3438 " not implemented on this target");
3441 /* Postpone any pending signal. It was enqueued above. */
3445 /* If we have while-stepping actions in this thread set it stepping.
3446 If we have a signal to deliver, it may or may not be set to
3447 SIG_IGN, we don't know. Assume so, and allow collecting
3448 while-stepping into a signal handler. A possible smart thing to
3449 do would be to set an internal breakpoint at the signal return
3450 address, continue, and carry on catching this while-stepping
3451 action only when that breakpoint is hit. A future
3453 if (thread
->while_stepping
!= NULL
3454 && can_hardware_single_step ())
3457 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3462 if (the_low_target
.get_pc
!= NULL
)
3464 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3466 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3470 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3471 (long) lwp
->stop_pc
);
3475 /* If we have pending signals, consume one unless we are trying to
3476 reinsert a breakpoint or we're trying to finish a fast tracepoint
3478 if (lwp
->pending_signals
!= NULL
3479 && lwp
->bp_reinsert
== 0
3480 && fast_tp_collecting
== 0)
3482 struct pending_signals
**p_sig
;
3484 p_sig
= &lwp
->pending_signals
;
3485 while ((*p_sig
)->prev
!= NULL
)
3486 p_sig
= &(*p_sig
)->prev
;
3488 signal
= (*p_sig
)->signal
;
3489 if ((*p_sig
)->info
.si_signo
!= 0)
3490 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3497 if (the_low_target
.prepare_to_resume
!= NULL
)
3498 the_low_target
.prepare_to_resume (lwp
);
3500 regcache_invalidate_thread (thread
);
3503 lwp
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
3504 lwp
->stepping
= step
;
3505 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3506 (PTRACE_TYPE_ARG3
) 0,
3507 /* Coerce to a uintptr_t first to avoid potential gcc warning
3508 of coercing an 8 byte integer to a 4 byte pointer. */
3509 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3511 current_thread
= saved_thread
;
3514 /* ESRCH from ptrace either means that the thread was already
3515 running (an error) or that it is gone (a race condition). If
3516 it's gone, we will get a notification the next time we wait,
3517 so we can ignore the error. We could differentiate these
3518 two, but it's tricky without waiting; the thread still exists
3519 as a zombie, so sending it signal 0 would succeed. So just
3524 perror_with_name ("ptrace");
3528 struct thread_resume_array
3530 struct thread_resume
*resume
;
3534 /* This function is called once per thread via find_inferior.
3535 ARG is a pointer to a thread_resume_array struct.
3536 We look up the thread specified by ENTRY in ARG, and mark the thread
3537 with a pointer to the appropriate resume request.
3539 This algorithm is O(threads * resume elements), but resume elements
3540 is small (and will remain small at least until GDB supports thread
3544 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3546 struct thread_info
*thread
= (struct thread_info
*) entry
;
3547 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3549 struct thread_resume_array
*r
;
3553 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3555 ptid_t ptid
= r
->resume
[ndx
].thread
;
3556 if (ptid_equal (ptid
, minus_one_ptid
)
3557 || ptid_equal (ptid
, entry
->id
)
3558 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3560 || (ptid_get_pid (ptid
) == pid_of (thread
)
3561 && (ptid_is_pid (ptid
)
3562 || ptid_get_lwp (ptid
) == -1)))
3564 if (r
->resume
[ndx
].kind
== resume_stop
3565 && thread
->last_resume_kind
== resume_stop
)
3568 debug_printf ("already %s LWP %ld at GDB's request\n",
3569 (thread
->last_status
.kind
3570 == TARGET_WAITKIND_STOPPED
)
3578 lwp
->resume
= &r
->resume
[ndx
];
3579 thread
->last_resume_kind
= lwp
->resume
->kind
;
3581 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3582 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3584 /* If we had a deferred signal to report, dequeue one now.
3585 This can happen if LWP gets more than one signal while
3586 trying to get out of a jump pad. */
3588 && !lwp
->status_pending_p
3589 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3591 lwp
->status_pending_p
= 1;
3594 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3595 "leaving status pending.\n",
3596 WSTOPSIG (lwp
->status_pending
),
3604 /* No resume action for this thread. */
3610 /* find_inferior callback for linux_resume.
3611 Set *FLAG_P if this lwp has an interesting status pending. */
3614 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3616 struct thread_info
*thread
= (struct thread_info
*) entry
;
3617 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3619 /* LWPs which will not be resumed are not interesting, because
3620 we might not wait for them next time through linux_wait. */
3621 if (lwp
->resume
== NULL
)
3624 if (thread_still_has_status_pending_p (thread
))
3625 * (int *) flag_p
= 1;
3630 /* Return 1 if this lwp that GDB wants running is stopped at an
3631 internal breakpoint that we need to step over. It assumes that any
3632 required STOP_PC adjustment has already been propagated to the
3633 inferior's regcache. */
3636 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3638 struct thread_info
*thread
= (struct thread_info
*) entry
;
3639 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3640 struct thread_info
*saved_thread
;
3643 /* LWPs which will not be resumed are not interesting, because we
3644 might not wait for them next time through linux_wait. */
3649 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3654 if (thread
->last_resume_kind
== resume_stop
)
3657 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3663 gdb_assert (lwp
->suspended
>= 0);
3668 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3673 if (!lwp
->need_step_over
)
3676 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3679 if (lwp
->status_pending_p
)
3682 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3688 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3692 /* If the PC has changed since we stopped, then don't do anything,
3693 and let the breakpoint/tracepoint be hit. This happens if, for
3694 instance, GDB handled the decr_pc_after_break subtraction itself,
3695 GDB is OOL stepping this thread, or the user has issued a "jump"
3696 command, or poked thread's registers herself. */
3697 if (pc
!= lwp
->stop_pc
)
3700 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3701 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3703 paddress (lwp
->stop_pc
), paddress (pc
));
3705 lwp
->need_step_over
= 0;
3709 saved_thread
= current_thread
;
3710 current_thread
= thread
;
3712 /* We can only step over breakpoints we know about. */
3713 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3715 /* Don't step over a breakpoint that GDB expects to hit
3716 though. If the condition is being evaluated on the target's side
3717 and it evaluate to false, step over this breakpoint as well. */
3718 if (gdb_breakpoint_here (pc
)
3719 && gdb_condition_true_at_breakpoint (pc
)
3720 && gdb_no_commands_at_breakpoint (pc
))
3723 debug_printf ("Need step over [LWP %ld]? yes, but found"
3724 " GDB breakpoint at 0x%s; skipping step over\n",
3725 lwpid_of (thread
), paddress (pc
));
3727 current_thread
= saved_thread
;
3733 debug_printf ("Need step over [LWP %ld]? yes, "
3734 "found breakpoint at 0x%s\n",
3735 lwpid_of (thread
), paddress (pc
));
3737 /* We've found an lwp that needs stepping over --- return 1 so
3738 that find_inferior stops looking. */
3739 current_thread
= saved_thread
;
3741 /* If the step over is cancelled, this is set again. */
3742 lwp
->need_step_over
= 0;
3747 current_thread
= saved_thread
;
3750 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3752 lwpid_of (thread
), paddress (pc
));
3757 /* Start a step-over operation on LWP. When LWP stopped at a
3758 breakpoint, to make progress, we need to remove the breakpoint out
3759 of the way. If we let other threads run while we do that, they may
3760 pass by the breakpoint location and miss hitting it. To avoid
3761 that, a step-over momentarily stops all threads while LWP is
3762 single-stepped while the breakpoint is temporarily uninserted from
3763 the inferior. When the single-step finishes, we reinsert the
3764 breakpoint, and let all threads that are supposed to be running,
3767 On targets that don't support hardware single-step, we don't
3768 currently support full software single-stepping. Instead, we only
3769 support stepping over the thread event breakpoint, by asking the
3770 low target where to place a reinsert breakpoint. Since this
3771 routine assumes the breakpoint being stepped over is a thread event
3772 breakpoint, it usually assumes the return address of the current
3773 function is a good enough place to set the reinsert breakpoint. */
3776 start_step_over (struct lwp_info
*lwp
)
3778 struct thread_info
*thread
= get_lwp_thread (lwp
);
3779 struct thread_info
*saved_thread
;
3784 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3787 stop_all_lwps (1, lwp
);
3788 gdb_assert (lwp
->suspended
== 0);
3791 debug_printf ("Done stopping all threads for step-over.\n");
3793 /* Note, we should always reach here with an already adjusted PC,
3794 either by GDB (if we're resuming due to GDB's request), or by our
3795 caller, if we just finished handling an internal breakpoint GDB
3796 shouldn't care about. */
3799 saved_thread
= current_thread
;
3800 current_thread
= thread
;
3802 lwp
->bp_reinsert
= pc
;
3803 uninsert_breakpoints_at (pc
);
3804 uninsert_fast_tracepoint_jumps_at (pc
);
3806 if (can_hardware_single_step ())
3812 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3813 set_reinsert_breakpoint (raddr
);
3817 current_thread
= saved_thread
;
3819 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3821 /* Require next event from this LWP. */
3822 step_over_bkpt
= thread
->entry
.id
;
3826 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3827 start_step_over, if still there, and delete any reinsert
3828 breakpoints we've set, on non hardware single-step targets. */
3831 finish_step_over (struct lwp_info
*lwp
)
3833 if (lwp
->bp_reinsert
!= 0)
3836 debug_printf ("Finished step over.\n");
3838 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3839 may be no breakpoint to reinsert there by now. */
3840 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3841 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3843 lwp
->bp_reinsert
= 0;
3845 /* Delete any software-single-step reinsert breakpoints. No
3846 longer needed. We don't have to worry about other threads
3847 hitting this trap, and later not being able to explain it,
3848 because we were stepping over a breakpoint, and we hold all
3849 threads but LWP stopped while doing that. */
3850 if (!can_hardware_single_step ())
3851 delete_reinsert_breakpoints ();
3853 step_over_bkpt
= null_ptid
;
3860 /* This function is called once per thread. We check the thread's resume
3861 request, which will tell us whether to resume, step, or leave the thread
3862 stopped; and what signal, if any, it should be sent.
3864 For threads which we aren't explicitly told otherwise, we preserve
3865 the stepping flag; this is used for stepping over gdbserver-placed
3868 If pending_flags was set in any thread, we queue any needed
3869 signals, since we won't actually resume. We already have a pending
3870 event to report, so we don't need to preserve any step requests;
3871 they should be re-issued if necessary. */
3874 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3876 struct thread_info
*thread
= (struct thread_info
*) entry
;
3877 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3879 int leave_all_stopped
= * (int *) arg
;
3882 if (lwp
->resume
== NULL
)
3885 if (lwp
->resume
->kind
== resume_stop
)
3888 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3893 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3895 /* Stop the thread, and wait for the event asynchronously,
3896 through the event loop. */
3902 debug_printf ("already stopped LWP %ld\n",
3905 /* The LWP may have been stopped in an internal event that
3906 was not meant to be notified back to GDB (e.g., gdbserver
3907 breakpoint), so we should be reporting a stop event in
3910 /* If the thread already has a pending SIGSTOP, this is a
3911 no-op. Otherwise, something later will presumably resume
3912 the thread and this will cause it to cancel any pending
3913 operation, due to last_resume_kind == resume_stop. If
3914 the thread already has a pending status to report, we
3915 will still report it the next time we wait - see
3916 status_pending_p_callback. */
3918 /* If we already have a pending signal to report, then
3919 there's no need to queue a SIGSTOP, as this means we're
3920 midway through moving the LWP out of the jumppad, and we
3921 will report the pending signal as soon as that is
3923 if (lwp
->pending_signals_to_report
== NULL
)
3927 /* For stop requests, we're done. */
3929 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3933 /* If this thread which is about to be resumed has a pending status,
3934 then don't resume any threads - we can just report the pending
3935 status. Make sure to queue any signals that would otherwise be
3936 sent. In all-stop mode, we do this decision based on if *any*
3937 thread has a pending status. If there's a thread that needs the
3938 step-over-breakpoint dance, then don't resume any other thread
3939 but that particular one. */
3940 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3945 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3947 step
= (lwp
->resume
->kind
== resume_step
);
3948 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3953 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3955 /* If we have a new signal, enqueue the signal. */
3956 if (lwp
->resume
->sig
!= 0)
3958 struct pending_signals
*p_sig
;
3959 p_sig
= xmalloc (sizeof (*p_sig
));
3960 p_sig
->prev
= lwp
->pending_signals
;
3961 p_sig
->signal
= lwp
->resume
->sig
;
3962 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3964 /* If this is the same signal we were previously stopped by,
3965 make sure to queue its siginfo. We can ignore the return
3966 value of ptrace; if it fails, we'll skip
3967 PTRACE_SETSIGINFO. */
3968 if (WIFSTOPPED (lwp
->last_status
)
3969 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3970 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3973 lwp
->pending_signals
= p_sig
;
3977 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3983 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3985 struct thread_resume_array array
= { resume_info
, n
};
3986 struct thread_info
*need_step_over
= NULL
;
3988 int leave_all_stopped
;
3993 debug_printf ("linux_resume:\n");
3996 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3998 /* If there is a thread which would otherwise be resumed, which has
3999 a pending status, then don't resume any threads - we can just
4000 report the pending status. Make sure to queue any signals that
4001 would otherwise be sent. In non-stop mode, we'll apply this
4002 logic to each thread individually. We consume all pending events
4003 before considering to start a step-over (in all-stop). */
4006 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4008 /* If there is a thread which would otherwise be resumed, which is
4009 stopped at a breakpoint that needs stepping over, then don't
4010 resume any threads - have it step over the breakpoint with all
4011 other threads stopped, then resume all threads again. Make sure
4012 to queue any signals that would otherwise be delivered or
4014 if (!any_pending
&& supports_breakpoints ())
4016 = (struct thread_info
*) find_inferior (&all_threads
,
4017 need_step_over_p
, NULL
);
4019 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4023 if (need_step_over
!= NULL
)
4024 debug_printf ("Not resuming all, need step over\n");
4025 else if (any_pending
)
4026 debug_printf ("Not resuming, all-stop and found "
4027 "an LWP with pending status\n");
4029 debug_printf ("Resuming, no pending status or step over needed\n");
4032 /* Even if we're leaving threads stopped, queue all signals we'd
4033 otherwise deliver. */
4034 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4037 start_step_over (get_thread_lwp (need_step_over
));
4041 debug_printf ("linux_resume done\n");
4046 /* This function is called once per thread. We check the thread's
4047 last resume request, which will tell us whether to resume, step, or
4048 leave the thread stopped. Any signal the client requested to be
4049 delivered has already been enqueued at this point.
4051 If any thread that GDB wants running is stopped at an internal
4052 breakpoint that needs stepping over, we start a step-over operation
4053 on that particular thread, and leave all others stopped. */
4056 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4058 struct thread_info
*thread
= (struct thread_info
*) entry
;
4059 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4066 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4071 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4075 if (thread
->last_resume_kind
== resume_stop
4076 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4079 debug_printf (" client wants LWP to remain %ld stopped\n",
4084 if (lwp
->status_pending_p
)
4087 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4092 gdb_assert (lwp
->suspended
>= 0);
4097 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4101 if (thread
->last_resume_kind
== resume_stop
4102 && lwp
->pending_signals_to_report
== NULL
4103 && lwp
->collecting_fast_tracepoint
== 0)
4105 /* We haven't reported this LWP as stopped yet (otherwise, the
4106 last_status.kind check above would catch it, and we wouldn't
4107 reach here. This LWP may have been momentarily paused by a
4108 stop_all_lwps call while handling for example, another LWP's
4109 step-over. In that case, the pending expected SIGSTOP signal
4110 that was queued at vCont;t handling time will have already
4111 been consumed by wait_for_sigstop, and so we need to requeue
4112 another one here. Note that if the LWP already has a SIGSTOP
4113 pending, this is a no-op. */
4116 debug_printf ("Client wants LWP %ld to stop. "
4117 "Making sure it has a SIGSTOP pending\n",
4123 step
= thread
->last_resume_kind
== resume_step
;
4124 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4129 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4131 struct thread_info
*thread
= (struct thread_info
*) entry
;
4132 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4138 gdb_assert (lwp
->suspended
>= 0);
4140 return proceed_one_lwp (entry
, except
);
4143 /* When we finish a step-over, set threads running again. If there's
4144 another thread that may need a step-over, now's the time to start
4145 it. Eventually, we'll move all threads past their breakpoints. */
4148 proceed_all_lwps (void)
4150 struct thread_info
*need_step_over
;
4152 /* If there is a thread which would otherwise be resumed, which is
4153 stopped at a breakpoint that needs stepping over, then don't
4154 resume any threads - have it step over the breakpoint with all
4155 other threads stopped, then resume all threads again. */
4157 if (supports_breakpoints ())
4160 = (struct thread_info
*) find_inferior (&all_threads
,
4161 need_step_over_p
, NULL
);
4163 if (need_step_over
!= NULL
)
4166 debug_printf ("proceed_all_lwps: found "
4167 "thread %ld needing a step-over\n",
4168 lwpid_of (need_step_over
));
4170 start_step_over (get_thread_lwp (need_step_over
));
4176 debug_printf ("Proceeding, no step-over needed\n");
4178 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4181 /* Stopped LWPs that the client wanted to be running, that don't have
4182 pending statuses, are set to run again, except for EXCEPT, if not
4183 NULL. This undoes a stop_all_lwps call. */
4186 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4192 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4193 lwpid_of (get_lwp_thread (except
)));
4195 debug_printf ("unstopping all lwps\n");
4199 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4201 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4205 debug_printf ("unstop_all_lwps done\n");
4211 #ifdef HAVE_LINUX_REGSETS
4213 #define use_linux_regsets 1
4215 /* Returns true if REGSET has been disabled. */
4218 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4220 return (info
->disabled_regsets
!= NULL
4221 && info
->disabled_regsets
[regset
- info
->regsets
]);
4224 /* Disable REGSET. */
4227 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4231 dr_offset
= regset
- info
->regsets
;
4232 if (info
->disabled_regsets
== NULL
)
4233 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4234 info
->disabled_regsets
[dr_offset
] = 1;
4238 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4239 struct regcache
*regcache
)
4241 struct regset_info
*regset
;
4242 int saw_general_regs
= 0;
4246 pid
= lwpid_of (current_thread
);
4247 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4252 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4255 buf
= xmalloc (regset
->size
);
4257 nt_type
= regset
->nt_type
;
4261 iov
.iov_len
= regset
->size
;
4262 data
= (void *) &iov
;
4268 res
= ptrace (regset
->get_request
, pid
,
4269 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4271 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4277 /* If we get EIO on a regset, do not try it again for
4278 this process mode. */
4279 disable_regset (regsets_info
, regset
);
4281 else if (errno
== ENODATA
)
4283 /* ENODATA may be returned if the regset is currently
4284 not "active". This can happen in normal operation,
4285 so suppress the warning in this case. */
4290 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4297 if (regset
->type
== GENERAL_REGS
)
4298 saw_general_regs
= 1;
4299 regset
->store_function (regcache
, buf
);
4303 if (saw_general_regs
)
4310 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4311 struct regcache
*regcache
)
4313 struct regset_info
*regset
;
4314 int saw_general_regs
= 0;
4318 pid
= lwpid_of (current_thread
);
4319 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4324 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4325 || regset
->fill_function
== NULL
)
4328 buf
= xmalloc (regset
->size
);
4330 /* First fill the buffer with the current register set contents,
4331 in case there are any items in the kernel's regset that are
4332 not in gdbserver's regcache. */
4334 nt_type
= regset
->nt_type
;
4338 iov
.iov_len
= regset
->size
;
4339 data
= (void *) &iov
;
4345 res
= ptrace (regset
->get_request
, pid
,
4346 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4348 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4353 /* Then overlay our cached registers on that. */
4354 regset
->fill_function (regcache
, buf
);
4356 /* Only now do we write the register set. */
4358 res
= ptrace (regset
->set_request
, pid
,
4359 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4361 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4369 /* If we get EIO on a regset, do not try it again for
4370 this process mode. */
4371 disable_regset (regsets_info
, regset
);
4373 else if (errno
== ESRCH
)
4375 /* At this point, ESRCH should mean the process is
4376 already gone, in which case we simply ignore attempts
4377 to change its registers. See also the related
4378 comment in linux_resume_one_lwp. */
4384 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4387 else if (regset
->type
== GENERAL_REGS
)
4388 saw_general_regs
= 1;
4391 if (saw_general_regs
)
4397 #else /* !HAVE_LINUX_REGSETS */
4399 #define use_linux_regsets 0
4400 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4401 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4405 /* Return 1 if register REGNO is supported by one of the regset ptrace
4406 calls or 0 if it has to be transferred individually. */
4409 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4411 unsigned char mask
= 1 << (regno
% 8);
4412 size_t index
= regno
/ 8;
4414 return (use_linux_regsets
4415 && (regs_info
->regset_bitmap
== NULL
4416 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4419 #ifdef HAVE_LINUX_USRREGS
4422 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4426 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4427 error ("Invalid register number %d.", regnum
);
4429 addr
= usrregs
->regmap
[regnum
];
4434 /* Fetch one register. */
4436 fetch_register (const struct usrregs_info
*usrregs
,
4437 struct regcache
*regcache
, int regno
)
4444 if (regno
>= usrregs
->num_regs
)
4446 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4449 regaddr
= register_addr (usrregs
, regno
);
4453 size
= ((register_size (regcache
->tdesc
, regno
)
4454 + sizeof (PTRACE_XFER_TYPE
) - 1)
4455 & -sizeof (PTRACE_XFER_TYPE
));
4456 buf
= alloca (size
);
4458 pid
= lwpid_of (current_thread
);
4459 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4462 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4463 ptrace (PTRACE_PEEKUSER
, pid
,
4464 /* Coerce to a uintptr_t first to avoid potential gcc warning
4465 of coercing an 8 byte integer to a 4 byte pointer. */
4466 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4467 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4469 error ("reading register %d: %s", regno
, strerror (errno
));
4472 if (the_low_target
.supply_ptrace_register
)
4473 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4475 supply_register (regcache
, regno
, buf
);
4478 /* Store one register. */
4480 store_register (const struct usrregs_info
*usrregs
,
4481 struct regcache
*regcache
, int regno
)
4488 if (regno
>= usrregs
->num_regs
)
4490 if ((*the_low_target
.cannot_store_register
) (regno
))
4493 regaddr
= register_addr (usrregs
, regno
);
4497 size
= ((register_size (regcache
->tdesc
, regno
)
4498 + sizeof (PTRACE_XFER_TYPE
) - 1)
4499 & -sizeof (PTRACE_XFER_TYPE
));
4500 buf
= alloca (size
);
4501 memset (buf
, 0, size
);
4503 if (the_low_target
.collect_ptrace_register
)
4504 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4506 collect_register (regcache
, regno
, buf
);
4508 pid
= lwpid_of (current_thread
);
4509 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4512 ptrace (PTRACE_POKEUSER
, pid
,
4513 /* Coerce to a uintptr_t first to avoid potential gcc warning
4514 about coercing an 8 byte integer to a 4 byte pointer. */
4515 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4516 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4519 /* At this point, ESRCH should mean the process is
4520 already gone, in which case we simply ignore attempts
4521 to change its registers. See also the related
4522 comment in linux_resume_one_lwp. */
4526 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4527 error ("writing register %d: %s", regno
, strerror (errno
));
4529 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4533 /* Fetch all registers, or just one, from the child process.
4534 If REGNO is -1, do this for all registers, skipping any that are
4535 assumed to have been retrieved by regsets_fetch_inferior_registers,
4536 unless ALL is non-zero.
4537 Otherwise, REGNO specifies which register (so we can save time). */
4539 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4540 struct regcache
*regcache
, int regno
, int all
)
4542 struct usrregs_info
*usr
= regs_info
->usrregs
;
4546 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4547 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4548 fetch_register (usr
, regcache
, regno
);
4551 fetch_register (usr
, regcache
, regno
);
4554 /* Store our register values back into the inferior.
4555 If REGNO is -1, do this for all registers, skipping any that are
4556 assumed to have been saved by regsets_store_inferior_registers,
4557 unless ALL is non-zero.
4558 Otherwise, REGNO specifies which register (so we can save time). */
4560 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4561 struct regcache
*regcache
, int regno
, int all
)
4563 struct usrregs_info
*usr
= regs_info
->usrregs
;
4567 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4568 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4569 store_register (usr
, regcache
, regno
);
4572 store_register (usr
, regcache
, regno
);
4575 #else /* !HAVE_LINUX_USRREGS */
4577 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4578 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4584 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4588 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4592 if (the_low_target
.fetch_register
!= NULL
4593 && regs_info
->usrregs
!= NULL
)
4594 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4595 (*the_low_target
.fetch_register
) (regcache
, regno
);
4597 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4598 if (regs_info
->usrregs
!= NULL
)
4599 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4603 if (the_low_target
.fetch_register
!= NULL
4604 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4607 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4609 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4611 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4612 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4617 linux_store_registers (struct regcache
*regcache
, int regno
)
4621 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4625 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4627 if (regs_info
->usrregs
!= NULL
)
4628 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4632 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4634 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4636 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4637 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4642 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4643 to debugger memory starting at MYADDR. */
4646 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4648 int pid
= lwpid_of (current_thread
);
4649 register PTRACE_XFER_TYPE
*buffer
;
4650 register CORE_ADDR addr
;
4657 /* Try using /proc. Don't bother for one word. */
4658 if (len
>= 3 * sizeof (long))
4662 /* We could keep this file open and cache it - possibly one per
4663 thread. That requires some juggling, but is even faster. */
4664 sprintf (filename
, "/proc/%d/mem", pid
);
4665 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4669 /* If pread64 is available, use it. It's faster if the kernel
4670 supports it (only one syscall), and it's 64-bit safe even on
4671 32-bit platforms (for instance, SPARC debugging a SPARC64
4674 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4677 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4678 bytes
= read (fd
, myaddr
, len
);
4685 /* Some data was read, we'll try to get the rest with ptrace. */
4695 /* Round starting address down to longword boundary. */
4696 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4697 /* Round ending address up; get number of longwords that makes. */
4698 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4699 / sizeof (PTRACE_XFER_TYPE
));
4700 /* Allocate buffer of that many longwords. */
4701 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4703 /* Read all the longwords */
4705 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4707 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4708 about coercing an 8 byte integer to a 4 byte pointer. */
4709 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4710 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4711 (PTRACE_TYPE_ARG4
) 0);
4717 /* Copy appropriate bytes out of the buffer. */
4720 i
*= sizeof (PTRACE_XFER_TYPE
);
4721 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4723 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4730 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4731 memory at MEMADDR. On failure (cannot write to the inferior)
4732 returns the value of errno. Always succeeds if LEN is zero. */
4735 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4738 /* Round starting address down to longword boundary. */
4739 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4740 /* Round ending address up; get number of longwords that makes. */
4742 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4743 / sizeof (PTRACE_XFER_TYPE
);
4745 /* Allocate buffer of that many longwords. */
4746 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4747 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4749 int pid
= lwpid_of (current_thread
);
4753 /* Zero length write always succeeds. */
4759 /* Dump up to four bytes. */
4760 unsigned int val
= * (unsigned int *) myaddr
;
4766 val
= val
& 0xffffff;
4767 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4768 val
, (long)memaddr
);
4771 /* Fill start and end extra bytes of buffer with existing memory data. */
4774 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4775 about coercing an 8 byte integer to a 4 byte pointer. */
4776 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4777 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4778 (PTRACE_TYPE_ARG4
) 0);
4786 = ptrace (PTRACE_PEEKTEXT
, pid
,
4787 /* Coerce to a uintptr_t first to avoid potential gcc warning
4788 about coercing an 8 byte integer to a 4 byte pointer. */
4789 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4790 * sizeof (PTRACE_XFER_TYPE
)),
4791 (PTRACE_TYPE_ARG4
) 0);
4796 /* Copy data to be written over corresponding part of buffer. */
4798 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4801 /* Write the entire buffer. */
4803 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4806 ptrace (PTRACE_POKETEXT
, pid
,
4807 /* Coerce to a uintptr_t first to avoid potential gcc warning
4808 about coercing an 8 byte integer to a 4 byte pointer. */
4809 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4810 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4819 linux_look_up_symbols (void)
4821 #ifdef USE_THREAD_DB
4822 struct process_info
*proc
= current_process ();
4824 if (proc
->private->thread_db
!= NULL
)
4827 /* If the kernel supports tracing clones, then we don't need to
4828 use the magic thread event breakpoint to learn about
4830 thread_db_init (!linux_supports_traceclone ());
4835 linux_request_interrupt (void)
4837 extern unsigned long signal_pid
;
4839 /* Send a SIGINT to the process group. This acts just like the user
4840 typed a ^C on the controlling terminal. */
4841 kill (-signal_pid
, SIGINT
);
4844 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4845 to debugger memory starting at MYADDR. */
4848 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4850 char filename
[PATH_MAX
];
4852 int pid
= lwpid_of (current_thread
);
4854 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4856 fd
= open (filename
, O_RDONLY
);
4860 if (offset
!= (CORE_ADDR
) 0
4861 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4864 n
= read (fd
, myaddr
, len
);
4871 /* These breakpoint and watchpoint related wrapper functions simply
4872 pass on the function call if the target has registered a
4873 corresponding function. */
4876 linux_supports_z_point_type (char z_type
)
4878 return (the_low_target
.supports_z_point_type
!= NULL
4879 && the_low_target
.supports_z_point_type (z_type
));
4883 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4884 int size
, struct raw_breakpoint
*bp
)
4886 if (the_low_target
.insert_point
!= NULL
)
4887 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4889 /* Unsupported (see target.h). */
4894 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4895 int size
, struct raw_breakpoint
*bp
)
4897 if (the_low_target
.remove_point
!= NULL
)
4898 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4900 /* Unsupported (see target.h). */
4905 linux_stopped_by_watchpoint (void)
4907 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4909 return lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
4913 linux_stopped_data_address (void)
4915 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4917 return lwp
->stopped_data_address
;
4920 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4921 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4922 && defined(PT_TEXT_END_ADDR)
4924 /* This is only used for targets that define PT_TEXT_ADDR,
4925 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4926 the target has different ways of acquiring this information, like
4929 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4930 to tell gdb about. */
4933 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4935 unsigned long text
, text_end
, data
;
4936 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4940 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4941 (PTRACE_TYPE_ARG4
) 0);
4942 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4943 (PTRACE_TYPE_ARG4
) 0);
4944 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4945 (PTRACE_TYPE_ARG4
) 0);
4949 /* Both text and data offsets produced at compile-time (and so
4950 used by gdb) are relative to the beginning of the program,
4951 with the data segment immediately following the text segment.
4952 However, the actual runtime layout in memory may put the data
4953 somewhere else, so when we send gdb a data base-address, we
4954 use the real data base address and subtract the compile-time
4955 data base-address from it (which is just the length of the
4956 text segment). BSS immediately follows data in both
4959 *data_p
= data
- (text_end
- text
);
4968 linux_qxfer_osdata (const char *annex
,
4969 unsigned char *readbuf
, unsigned const char *writebuf
,
4970 CORE_ADDR offset
, int len
)
4972 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4975 /* Convert a native/host siginfo object, into/from the siginfo in the
4976 layout of the inferiors' architecture. */
4979 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4983 if (the_low_target
.siginfo_fixup
!= NULL
)
4984 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4986 /* If there was no callback, or the callback didn't do anything,
4987 then just do a straight memcpy. */
4991 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4993 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4998 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4999 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5003 char inf_siginfo
[sizeof (siginfo_t
)];
5005 if (current_thread
== NULL
)
5008 pid
= lwpid_of (current_thread
);
5011 debug_printf ("%s siginfo for lwp %d.\n",
5012 readbuf
!= NULL
? "Reading" : "Writing",
5015 if (offset
>= sizeof (siginfo
))
5018 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5021 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5022 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5023 inferior with a 64-bit GDBSERVER should look the same as debugging it
5024 with a 32-bit GDBSERVER, we need to convert it. */
5025 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5027 if (offset
+ len
> sizeof (siginfo
))
5028 len
= sizeof (siginfo
) - offset
;
5030 if (readbuf
!= NULL
)
5031 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5034 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5036 /* Convert back to ptrace layout before flushing it out. */
5037 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5039 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5046 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5047 so we notice when children change state; as the handler for the
5048 sigsuspend in my_waitpid. */
5051 sigchld_handler (int signo
)
5053 int old_errno
= errno
;
5059 /* fprintf is not async-signal-safe, so call write
5061 if (write (2, "sigchld_handler\n",
5062 sizeof ("sigchld_handler\n") - 1) < 0)
5063 break; /* just ignore */
5067 if (target_is_async_p ())
5068 async_file_mark (); /* trigger a linux_wait */
5074 linux_supports_non_stop (void)
5080 linux_async (int enable
)
5082 int previous
= target_is_async_p ();
5085 debug_printf ("linux_async (%d), previous=%d\n",
5088 if (previous
!= enable
)
5091 sigemptyset (&mask
);
5092 sigaddset (&mask
, SIGCHLD
);
5094 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5098 if (pipe (linux_event_pipe
) == -1)
5100 linux_event_pipe
[0] = -1;
5101 linux_event_pipe
[1] = -1;
5102 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5104 warning ("creating event pipe failed.");
5108 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5109 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5111 /* Register the event loop handler. */
5112 add_file_handler (linux_event_pipe
[0],
5113 handle_target_event
, NULL
);
5115 /* Always trigger a linux_wait. */
5120 delete_file_handler (linux_event_pipe
[0]);
5122 close (linux_event_pipe
[0]);
5123 close (linux_event_pipe
[1]);
5124 linux_event_pipe
[0] = -1;
5125 linux_event_pipe
[1] = -1;
5128 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5135 linux_start_non_stop (int nonstop
)
5137 /* Register or unregister from event-loop accordingly. */
5138 linux_async (nonstop
);
5140 if (target_is_async_p () != (nonstop
!= 0))
5147 linux_supports_multi_process (void)
5153 linux_supports_disable_randomization (void)
5155 #ifdef HAVE_PERSONALITY
5163 linux_supports_agent (void)
5169 linux_supports_range_stepping (void)
5171 if (*the_low_target
.supports_range_stepping
== NULL
)
5174 return (*the_low_target
.supports_range_stepping
) ();
5177 /* Enumerate spufs IDs for process PID. */
5179 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5185 struct dirent
*entry
;
5187 sprintf (path
, "/proc/%ld/fd", pid
);
5188 dir
= opendir (path
);
5193 while ((entry
= readdir (dir
)) != NULL
)
5199 fd
= atoi (entry
->d_name
);
5203 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5204 if (stat (path
, &st
) != 0)
5206 if (!S_ISDIR (st
.st_mode
))
5209 if (statfs (path
, &stfs
) != 0)
5211 if (stfs
.f_type
!= SPUFS_MAGIC
)
5214 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5216 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5226 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5227 object type, using the /proc file system. */
5229 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5230 unsigned const char *writebuf
,
5231 CORE_ADDR offset
, int len
)
5233 long pid
= lwpid_of (current_thread
);
5238 if (!writebuf
&& !readbuf
)
5246 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5249 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5250 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5255 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5262 ret
= write (fd
, writebuf
, (size_t) len
);
5264 ret
= read (fd
, readbuf
, (size_t) len
);
5270 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5271 struct target_loadseg
5273 /* Core address to which the segment is mapped. */
5275 /* VMA recorded in the program header. */
5277 /* Size of this segment in memory. */
5281 # if defined PT_GETDSBT
5282 struct target_loadmap
5284 /* Protocol version number, must be zero. */
5286 /* Pointer to the DSBT table, its size, and the DSBT index. */
5287 unsigned *dsbt_table
;
5288 unsigned dsbt_size
, dsbt_index
;
5289 /* Number of segments in this map. */
5291 /* The actual memory map. */
5292 struct target_loadseg segs
[/*nsegs*/];
5294 # define LINUX_LOADMAP PT_GETDSBT
5295 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5296 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5298 struct target_loadmap
5300 /* Protocol version number, must be zero. */
5302 /* Number of segments in this map. */
5304 /* The actual memory map. */
5305 struct target_loadseg segs
[/*nsegs*/];
5307 # define LINUX_LOADMAP PTRACE_GETFDPIC
5308 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5309 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5313 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5314 unsigned char *myaddr
, unsigned int len
)
5316 int pid
= lwpid_of (current_thread
);
5318 struct target_loadmap
*data
= NULL
;
5319 unsigned int actual_length
, copy_length
;
5321 if (strcmp (annex
, "exec") == 0)
5322 addr
= (int) LINUX_LOADMAP_EXEC
;
5323 else if (strcmp (annex
, "interp") == 0)
5324 addr
= (int) LINUX_LOADMAP_INTERP
;
5328 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5334 actual_length
= sizeof (struct target_loadmap
)
5335 + sizeof (struct target_loadseg
) * data
->nsegs
;
5337 if (offset
< 0 || offset
> actual_length
)
5340 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5341 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5345 # define linux_read_loadmap NULL
5346 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5349 linux_process_qsupported (const char *query
)
5351 if (the_low_target
.process_qsupported
!= NULL
)
5352 the_low_target
.process_qsupported (query
);
5356 linux_supports_tracepoints (void)
5358 if (*the_low_target
.supports_tracepoints
== NULL
)
5361 return (*the_low_target
.supports_tracepoints
) ();
5365 linux_read_pc (struct regcache
*regcache
)
5367 if (the_low_target
.get_pc
== NULL
)
5370 return (*the_low_target
.get_pc
) (regcache
);
5374 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5376 gdb_assert (the_low_target
.set_pc
!= NULL
);
5378 (*the_low_target
.set_pc
) (regcache
, pc
);
5382 linux_thread_stopped (struct thread_info
*thread
)
5384 return get_thread_lwp (thread
)->stopped
;
5387 /* This exposes stop-all-threads functionality to other modules. */
5390 linux_pause_all (int freeze
)
5392 stop_all_lwps (freeze
, NULL
);
5395 /* This exposes unstop-all-threads functionality to other gdbserver
5399 linux_unpause_all (int unfreeze
)
5401 unstop_all_lwps (unfreeze
, NULL
);
5405 linux_prepare_to_access_memory (void)
5407 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5410 linux_pause_all (1);
5415 linux_done_accessing_memory (void)
5417 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5420 linux_unpause_all (1);
5424 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5425 CORE_ADDR collector
,
5428 CORE_ADDR
*jump_entry
,
5429 CORE_ADDR
*trampoline
,
5430 ULONGEST
*trampoline_size
,
5431 unsigned char *jjump_pad_insn
,
5432 ULONGEST
*jjump_pad_insn_size
,
5433 CORE_ADDR
*adjusted_insn_addr
,
5434 CORE_ADDR
*adjusted_insn_addr_end
,
5437 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5438 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5439 jump_entry
, trampoline
, trampoline_size
,
5440 jjump_pad_insn
, jjump_pad_insn_size
,
5441 adjusted_insn_addr
, adjusted_insn_addr_end
,
5445 static struct emit_ops
*
5446 linux_emit_ops (void)
5448 if (the_low_target
.emit_ops
!= NULL
)
5449 return (*the_low_target
.emit_ops
) ();
5455 linux_get_min_fast_tracepoint_insn_len (void)
5457 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5460 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5463 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5464 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5466 char filename
[PATH_MAX
];
5468 const int auxv_size
= is_elf64
5469 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5470 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5472 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5474 fd
= open (filename
, O_RDONLY
);
5480 while (read (fd
, buf
, auxv_size
) == auxv_size
5481 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5485 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5487 switch (aux
->a_type
)
5490 *phdr_memaddr
= aux
->a_un
.a_val
;
5493 *num_phdr
= aux
->a_un
.a_val
;
5499 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5501 switch (aux
->a_type
)
5504 *phdr_memaddr
= aux
->a_un
.a_val
;
5507 *num_phdr
= aux
->a_un
.a_val
;
5515 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5517 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5518 "phdr_memaddr = %ld, phdr_num = %d",
5519 (long) *phdr_memaddr
, *num_phdr
);
5526 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5529 get_dynamic (const int pid
, const int is_elf64
)
5531 CORE_ADDR phdr_memaddr
, relocation
;
5533 unsigned char *phdr_buf
;
5534 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5536 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5539 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5540 phdr_buf
= alloca (num_phdr
* phdr_size
);
5542 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5545 /* Compute relocation: it is expected to be 0 for "regular" executables,
5546 non-zero for PIE ones. */
5548 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5551 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5553 if (p
->p_type
== PT_PHDR
)
5554 relocation
= phdr_memaddr
- p
->p_vaddr
;
5558 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5560 if (p
->p_type
== PT_PHDR
)
5561 relocation
= phdr_memaddr
- p
->p_vaddr
;
5564 if (relocation
== -1)
5566 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5567 any real world executables, including PIE executables, have always
5568 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5569 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5570 or present DT_DEBUG anyway (fpc binaries are statically linked).
5572 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5574 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5579 for (i
= 0; i
< num_phdr
; i
++)
5583 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5585 if (p
->p_type
== PT_DYNAMIC
)
5586 return p
->p_vaddr
+ relocation
;
5590 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5592 if (p
->p_type
== PT_DYNAMIC
)
5593 return p
->p_vaddr
+ relocation
;
5600 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5601 can be 0 if the inferior does not yet have the library list initialized.
5602 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5603 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5606 get_r_debug (const int pid
, const int is_elf64
)
5608 CORE_ADDR dynamic_memaddr
;
5609 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5610 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5613 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5614 if (dynamic_memaddr
== 0)
5617 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5621 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5622 #ifdef DT_MIPS_RLD_MAP
5626 unsigned char buf
[sizeof (Elf64_Xword
)];
5630 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5632 if (linux_read_memory (dyn
->d_un
.d_val
,
5633 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5638 #endif /* DT_MIPS_RLD_MAP */
5640 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5641 map
= dyn
->d_un
.d_val
;
5643 if (dyn
->d_tag
== DT_NULL
)
5648 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5649 #ifdef DT_MIPS_RLD_MAP
5653 unsigned char buf
[sizeof (Elf32_Word
)];
5657 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5659 if (linux_read_memory (dyn
->d_un
.d_val
,
5660 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5665 #endif /* DT_MIPS_RLD_MAP */
5667 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5668 map
= dyn
->d_un
.d_val
;
5670 if (dyn
->d_tag
== DT_NULL
)
5674 dynamic_memaddr
+= dyn_size
;
5680 /* Read one pointer from MEMADDR in the inferior. */
5683 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5687 /* Go through a union so this works on either big or little endian
5688 hosts, when the inferior's pointer size is smaller than the size
5689 of CORE_ADDR. It is assumed the inferior's endianness is the
5690 same of the superior's. */
5693 CORE_ADDR core_addr
;
5698 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5701 if (ptr_size
== sizeof (CORE_ADDR
))
5702 *ptr
= addr
.core_addr
;
5703 else if (ptr_size
== sizeof (unsigned int))
5706 gdb_assert_not_reached ("unhandled pointer size");
5711 struct link_map_offsets
5713 /* Offset and size of r_debug.r_version. */
5714 int r_version_offset
;
5716 /* Offset and size of r_debug.r_map. */
5719 /* Offset to l_addr field in struct link_map. */
5722 /* Offset to l_name field in struct link_map. */
5725 /* Offset to l_ld field in struct link_map. */
5728 /* Offset to l_next field in struct link_map. */
5731 /* Offset to l_prev field in struct link_map. */
5735 /* Construct qXfer:libraries-svr4:read reply. */
5738 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5739 unsigned const char *writebuf
,
5740 CORE_ADDR offset
, int len
)
5743 unsigned document_len
;
5744 struct process_info_private
*const priv
= current_process ()->private;
5745 char filename
[PATH_MAX
];
5748 static const struct link_map_offsets lmo_32bit_offsets
=
5750 0, /* r_version offset. */
5751 4, /* r_debug.r_map offset. */
5752 0, /* l_addr offset in link_map. */
5753 4, /* l_name offset in link_map. */
5754 8, /* l_ld offset in link_map. */
5755 12, /* l_next offset in link_map. */
5756 16 /* l_prev offset in link_map. */
5759 static const struct link_map_offsets lmo_64bit_offsets
=
5761 0, /* r_version offset. */
5762 8, /* r_debug.r_map offset. */
5763 0, /* l_addr offset in link_map. */
5764 8, /* l_name offset in link_map. */
5765 16, /* l_ld offset in link_map. */
5766 24, /* l_next offset in link_map. */
5767 32 /* l_prev offset in link_map. */
5769 const struct link_map_offsets
*lmo
;
5770 unsigned int machine
;
5772 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5773 int allocated
= 1024;
5775 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5776 int header_done
= 0;
5778 if (writebuf
!= NULL
)
5780 if (readbuf
== NULL
)
5783 pid
= lwpid_of (current_thread
);
5784 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5785 is_elf64
= elf_64_file_p (filename
, &machine
);
5786 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5787 ptr_size
= is_elf64
? 8 : 4;
5789 while (annex
[0] != '\0')
5795 sep
= strchr (annex
, '=');
5800 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5802 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5806 annex
= strchr (sep
, ';');
5813 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5820 if (priv
->r_debug
== 0)
5821 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5823 /* We failed to find DT_DEBUG. Such situation will not change
5824 for this inferior - do not retry it. Report it to GDB as
5825 E01, see for the reasons at the GDB solib-svr4.c side. */
5826 if (priv
->r_debug
== (CORE_ADDR
) -1)
5829 if (priv
->r_debug
!= 0)
5831 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5832 (unsigned char *) &r_version
,
5833 sizeof (r_version
)) != 0
5836 warning ("unexpected r_debug version %d", r_version
);
5838 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5839 &lm_addr
, ptr_size
) != 0)
5841 warning ("unable to read r_map from 0x%lx",
5842 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5847 document
= xmalloc (allocated
);
5848 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5849 p
= document
+ strlen (document
);
5852 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5853 &l_name
, ptr_size
) == 0
5854 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5855 &l_addr
, ptr_size
) == 0
5856 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5857 &l_ld
, ptr_size
) == 0
5858 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5859 &l_prev
, ptr_size
) == 0
5860 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5861 &l_next
, ptr_size
) == 0)
5863 unsigned char libname
[PATH_MAX
];
5865 if (lm_prev
!= l_prev
)
5867 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5868 (long) lm_prev
, (long) l_prev
);
5872 /* Ignore the first entry even if it has valid name as the first entry
5873 corresponds to the main executable. The first entry should not be
5874 skipped if the dynamic loader was loaded late by a static executable
5875 (see solib-svr4.c parameter ignore_first). But in such case the main
5876 executable does not have PT_DYNAMIC present and this function already
5877 exited above due to failed get_r_debug. */
5880 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5885 /* Not checking for error because reading may stop before
5886 we've got PATH_MAX worth of characters. */
5888 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5889 libname
[sizeof (libname
) - 1] = '\0';
5890 if (libname
[0] != '\0')
5892 /* 6x the size for xml_escape_text below. */
5893 size_t len
= 6 * strlen ((char *) libname
);
5898 /* Terminate `<library-list-svr4'. */
5903 while (allocated
< p
- document
+ len
+ 200)
5905 /* Expand to guarantee sufficient storage. */
5906 uintptr_t document_len
= p
- document
;
5908 document
= xrealloc (document
, 2 * allocated
);
5910 p
= document
+ document_len
;
5913 name
= xml_escape_text ((char *) libname
);
5914 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5915 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5916 name
, (unsigned long) lm_addr
,
5917 (unsigned long) l_addr
, (unsigned long) l_ld
);
5928 /* Empty list; terminate `<library-list-svr4'. */
5932 strcpy (p
, "</library-list-svr4>");
5934 document_len
= strlen (document
);
5935 if (offset
< document_len
)
5936 document_len
-= offset
;
5939 if (len
> document_len
)
5942 memcpy (readbuf
, document
+ offset
, len
);
5948 #ifdef HAVE_LINUX_BTRACE
5950 /* See to_enable_btrace target method. */
5952 static struct btrace_target_info
*
5953 linux_low_enable_btrace (ptid_t ptid
)
5955 struct btrace_target_info
*tinfo
;
5957 tinfo
= linux_enable_btrace (ptid
);
5961 struct thread_info
*thread
= find_thread_ptid (ptid
);
5962 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5964 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5970 /* See to_disable_btrace target method. */
5973 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5975 enum btrace_error err
;
5977 err
= linux_disable_btrace (tinfo
);
5978 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5981 /* See to_read_btrace target method. */
5984 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5987 VEC (btrace_block_s
) *btrace
;
5988 struct btrace_block
*block
;
5989 enum btrace_error err
;
5993 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5994 if (err
!= BTRACE_ERR_NONE
)
5996 if (err
== BTRACE_ERR_OVERFLOW
)
5997 buffer_grow_str0 (buffer
, "E.Overflow.");
5999 buffer_grow_str0 (buffer
, "E.Generic Error.");
6004 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6005 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6007 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
6008 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6009 paddress (block
->begin
), paddress (block
->end
));
6011 buffer_grow_str0 (buffer
, "</btrace>\n");
6013 VEC_free (btrace_block_s
, btrace
);
6017 #endif /* HAVE_LINUX_BTRACE */
6019 static struct target_ops linux_target_ops
= {
6020 linux_create_inferior
,
6029 linux_fetch_registers
,
6030 linux_store_registers
,
6031 linux_prepare_to_access_memory
,
6032 linux_done_accessing_memory
,
6035 linux_look_up_symbols
,
6036 linux_request_interrupt
,
6038 linux_supports_z_point_type
,
6041 linux_stopped_by_watchpoint
,
6042 linux_stopped_data_address
,
6043 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6044 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6045 && defined(PT_TEXT_END_ADDR)
6050 #ifdef USE_THREAD_DB
6051 thread_db_get_tls_address
,
6056 hostio_last_error_from_errno
,
6059 linux_supports_non_stop
,
6061 linux_start_non_stop
,
6062 linux_supports_multi_process
,
6063 #ifdef USE_THREAD_DB
6064 thread_db_handle_monitor_command
,
6068 linux_common_core_of_thread
,
6070 linux_process_qsupported
,
6071 linux_supports_tracepoints
,
6074 linux_thread_stopped
,
6078 linux_stabilize_threads
,
6079 linux_install_fast_tracepoint_jump_pad
,
6081 linux_supports_disable_randomization
,
6082 linux_get_min_fast_tracepoint_insn_len
,
6083 linux_qxfer_libraries_svr4
,
6084 linux_supports_agent
,
6085 #ifdef HAVE_LINUX_BTRACE
6086 linux_supports_btrace
,
6087 linux_low_enable_btrace
,
6088 linux_low_disable_btrace
,
6089 linux_low_read_btrace
,
6096 linux_supports_range_stepping
,
6100 linux_init_signals ()
6102 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6103 to find what the cancel signal actually is. */
6104 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6105 signal (__SIGRTMIN
+1, SIG_IGN
);
6109 #ifdef HAVE_LINUX_REGSETS
6111 initialize_regsets_info (struct regsets_info
*info
)
6113 for (info
->num_regsets
= 0;
6114 info
->regsets
[info
->num_regsets
].size
>= 0;
6115 info
->num_regsets
++)
6121 initialize_low (void)
6123 struct sigaction sigchld_action
;
6124 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6125 set_target_ops (&linux_target_ops
);
6126 set_breakpoint_data (the_low_target
.breakpoint
,
6127 the_low_target
.breakpoint_len
);
6128 linux_init_signals ();
6129 linux_ptrace_init_warnings ();
6131 sigchld_action
.sa_handler
= sigchld_handler
;
6132 sigemptyset (&sigchld_action
.sa_mask
);
6133 sigchld_action
.sa_flags
= SA_RESTART
;
6134 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6136 initialize_low_arch ();