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"
30 #include "nat/linux-personality.h"
32 #include <sys/ioctl.h>
35 #include <sys/syscall.h>
39 #include <sys/types.h>
44 #include "filestuff.h"
45 #include "tracepoint.h"
48 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
49 then ELFMAG0 will have been defined. If it didn't get included by
50 gdb_proc_service.h then including it will likely introduce a duplicate
51 definition of elf_fpregset_t. */
56 #define SPUFS_MAGIC 0x23c9b64e
59 #ifdef HAVE_PERSONALITY
60 # include <sys/personality.h>
61 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
62 # define ADDR_NO_RANDOMIZE 0x0040000
71 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
74 /* This is the kernel's hard limit. Not to be confused with
80 /* Some targets did not define these ptrace constants from the start,
81 so gdbserver defines them locally here. In the future, these may
82 be removed after they are added to asm/ptrace.h. */
83 #if !(defined(PT_TEXT_ADDR) \
84 || defined(PT_DATA_ADDR) \
85 || defined(PT_TEXT_END_ADDR))
86 #if defined(__mcoldfire__)
87 /* These are still undefined in 3.10 kernels. */
88 #define PT_TEXT_ADDR 49*4
89 #define PT_DATA_ADDR 50*4
90 #define PT_TEXT_END_ADDR 51*4
91 /* BFIN already defines these since at least 2.6.32 kernels. */
93 #define PT_TEXT_ADDR 220
94 #define PT_TEXT_END_ADDR 224
95 #define PT_DATA_ADDR 228
96 /* These are still undefined in 3.10 kernels. */
97 #elif defined(__TMS320C6X__)
98 #define PT_TEXT_ADDR (0x10000*4)
99 #define PT_DATA_ADDR (0x10004*4)
100 #define PT_TEXT_END_ADDR (0x10008*4)
104 #ifdef HAVE_LINUX_BTRACE
105 # include "nat/linux-btrace.h"
108 #ifndef HAVE_ELF32_AUXV_T
109 /* Copied from glibc's elf.h. */
112 uint32_t a_type
; /* Entry type */
115 uint32_t a_val
; /* Integer value */
116 /* We use to have pointer elements added here. We cannot do that,
117 though, since it does not work when using 32-bit definitions
118 on 64-bit platforms and vice versa. */
123 #ifndef HAVE_ELF64_AUXV_T
124 /* Copied from glibc's elf.h. */
127 uint64_t a_type
; /* Entry type */
130 uint64_t a_val
; /* Integer value */
131 /* We use to have pointer elements added here. We cannot do that,
132 though, since it does not work when using 32-bit definitions
133 on 64-bit platforms and vice versa. */
138 /* A list of all unknown processes which receive stop signals. Some
139 other process will presumably claim each of these as forked
140 children momentarily. */
142 struct simple_pid_list
144 /* The process ID. */
147 /* The status as reported by waitpid. */
151 struct simple_pid_list
*next
;
153 struct simple_pid_list
*stopped_pids
;
155 /* Trivial list manipulation functions to keep track of a list of new
156 stopped processes. */
159 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
161 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
164 new_pid
->status
= status
;
165 new_pid
->next
= *listp
;
170 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
172 struct simple_pid_list
**p
;
174 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
175 if ((*p
)->pid
== pid
)
177 struct simple_pid_list
*next
= (*p
)->next
;
179 *statusp
= (*p
)->status
;
187 enum stopping_threads_kind
189 /* Not stopping threads presently. */
190 NOT_STOPPING_THREADS
,
192 /* Stopping threads. */
195 /* Stopping and suspending threads. */
196 STOPPING_AND_SUSPENDING_THREADS
199 /* This is set while stop_all_lwps is in effect. */
200 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
202 /* FIXME make into a target method? */
203 int using_threads
= 1;
205 /* True if we're presently stabilizing threads (moving them out of
207 static int stabilizing_threads
;
209 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
210 int step
, int signal
, siginfo_t
*info
);
211 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
212 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
213 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
214 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
215 int *wstat
, int options
);
216 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
217 static struct lwp_info
*add_lwp (ptid_t ptid
);
218 static int linux_stopped_by_watchpoint (void);
219 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
220 static void proceed_all_lwps (void);
221 static int finish_step_over (struct lwp_info
*lwp
);
222 static int kill_lwp (unsigned long lwpid
, int signo
);
224 /* When the event-loop is doing a step-over, this points at the thread
226 ptid_t step_over_bkpt
;
228 /* True if the low target can hardware single-step. Such targets
229 don't need a BREAKPOINT_REINSERT_ADDR callback. */
232 can_hardware_single_step (void)
234 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
237 /* True if the low target supports memory breakpoints. If so, we'll
238 have a GET_PC implementation. */
241 supports_breakpoints (void)
243 return (the_low_target
.get_pc
!= NULL
);
246 /* Returns true if this target can support fast tracepoints. This
247 does not mean that the in-process agent has been loaded in the
251 supports_fast_tracepoints (void)
253 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
256 /* True if LWP is stopped in its stepping range. */
259 lwp_in_step_range (struct lwp_info
*lwp
)
261 CORE_ADDR pc
= lwp
->stop_pc
;
263 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
266 struct pending_signals
270 struct pending_signals
*prev
;
273 /* The read/write ends of the pipe registered as waitable file in the
275 static int linux_event_pipe
[2] = { -1, -1 };
277 /* True if we're currently in async mode. */
278 #define target_is_async_p() (linux_event_pipe[0] != -1)
280 static void send_sigstop (struct lwp_info
*lwp
);
281 static void wait_for_sigstop (void);
283 /* Return non-zero if HEADER is a 64-bit ELF file. */
286 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
288 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
289 && header
->e_ident
[EI_MAG1
] == ELFMAG1
290 && header
->e_ident
[EI_MAG2
] == ELFMAG2
291 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
293 *machine
= header
->e_machine
;
294 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
301 /* Return non-zero if FILE is a 64-bit ELF file,
302 zero if the file is not a 64-bit ELF file,
303 and -1 if the file is not accessible or doesn't exist. */
306 elf_64_file_p (const char *file
, unsigned int *machine
)
311 fd
= open (file
, O_RDONLY
);
315 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
322 return elf_64_header_p (&header
, machine
);
325 /* Accepts an integer PID; Returns true if the executable PID is
326 running is a 64-bit ELF file.. */
329 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
333 sprintf (file
, "/proc/%d/exe", pid
);
334 return elf_64_file_p (file
, machine
);
338 delete_lwp (struct lwp_info
*lwp
)
340 struct thread_info
*thr
= get_lwp_thread (lwp
);
343 debug_printf ("deleting %ld\n", lwpid_of (thr
));
346 free (lwp
->arch_private
);
350 /* Add a process to the common process list, and set its private
353 static struct process_info
*
354 linux_add_process (int pid
, int attached
)
356 struct process_info
*proc
;
358 proc
= add_process (pid
, attached
);
359 proc
->private = xcalloc (1, sizeof (*proc
->private));
361 /* Set the arch when the first LWP stops. */
362 proc
->private->new_inferior
= 1;
364 if (the_low_target
.new_process
!= NULL
)
365 proc
->private->arch_private
= the_low_target
.new_process ();
370 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
372 /* Handle a GNU/Linux extended wait response. If we see a clone
373 event, we need to add the new LWP to our list (and not report the
374 trap to higher layers). */
377 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
379 int event
= linux_ptrace_get_extended_event (wstat
);
380 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
381 struct lwp_info
*new_lwp
;
383 if (event
== PTRACE_EVENT_CLONE
)
386 unsigned long new_pid
;
389 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
392 /* If we haven't already seen the new PID stop, wait for it now. */
393 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
395 /* The new child has a pending SIGSTOP. We can't affect it until it
396 hits the SIGSTOP, but we're already attached. */
398 ret
= my_waitpid (new_pid
, &status
, __WALL
);
401 perror_with_name ("waiting for new child");
402 else if (ret
!= new_pid
)
403 warning ("wait returned unexpected PID %d", ret
);
404 else if (!WIFSTOPPED (status
))
405 warning ("wait returned unexpected status 0x%x", status
);
409 debug_printf ("HEW: Got clone event "
410 "from LWP %ld, new child is LWP %ld\n",
411 lwpid_of (event_thr
), new_pid
);
413 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
414 new_lwp
= add_lwp (ptid
);
416 /* Either we're going to immediately resume the new thread
417 or leave it stopped. linux_resume_one_lwp is a nop if it
418 thinks the thread is currently running, so set this first
419 before calling linux_resume_one_lwp. */
420 new_lwp
->stopped
= 1;
422 /* If we're suspending all threads, leave this one suspended
424 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
425 new_lwp
->suspended
= 1;
427 /* Normally we will get the pending SIGSTOP. But in some cases
428 we might get another signal delivered to the group first.
429 If we do get another signal, be sure not to lose it. */
430 if (WSTOPSIG (status
) == SIGSTOP
)
432 if (stopping_threads
== NOT_STOPPING_THREADS
)
433 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
437 new_lwp
->stop_expected
= 1;
439 if (stopping_threads
!= NOT_STOPPING_THREADS
)
441 new_lwp
->status_pending_p
= 1;
442 new_lwp
->status_pending
= status
;
445 /* Pass the signal on. This is what GDB does - except
446 shouldn't we really report it instead? */
447 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
450 /* Always resume the current thread. If we are stopping
451 threads, it will have a pending SIGSTOP; we may as well
453 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
457 /* Return the PC as read from the regcache of LWP, without any
461 get_pc (struct lwp_info
*lwp
)
463 struct thread_info
*saved_thread
;
464 struct regcache
*regcache
;
467 if (the_low_target
.get_pc
== NULL
)
470 saved_thread
= current_thread
;
471 current_thread
= get_lwp_thread (lwp
);
473 regcache
= get_thread_regcache (current_thread
, 1);
474 pc
= (*the_low_target
.get_pc
) (regcache
);
477 debug_printf ("pc is 0x%lx\n", (long) pc
);
479 current_thread
= saved_thread
;
483 /* This function should only be called if LWP got a SIGTRAP.
484 The SIGTRAP could mean several things.
486 On i386, where decr_pc_after_break is non-zero:
488 If we were single-stepping this process using PTRACE_SINGLESTEP, we
489 will get only the one SIGTRAP. The value of $eip will be the next
490 instruction. If the instruction we stepped over was a breakpoint,
491 we need to decrement the PC.
493 If we continue the process using PTRACE_CONT, we will get a
494 SIGTRAP when we hit a breakpoint. The value of $eip will be
495 the instruction after the breakpoint (i.e. needs to be
496 decremented). If we report the SIGTRAP to GDB, we must also
497 report the undecremented PC. If the breakpoint is removed, we
498 must resume at the decremented PC.
500 On a non-decr_pc_after_break machine with hardware or kernel
503 If we either single-step a breakpoint instruction, or continue and
504 hit a breakpoint instruction, our PC will point at the breakpoint
508 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
511 CORE_ADDR sw_breakpoint_pc
;
512 struct thread_info
*saved_thread
;
514 if (the_low_target
.get_pc
== NULL
)
518 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
520 /* breakpoint_at reads from the current thread. */
521 saved_thread
= current_thread
;
522 current_thread
= get_lwp_thread (lwp
);
524 /* We may have just stepped a breakpoint instruction. E.g., in
525 non-stop mode, GDB first tells the thread A to step a range, and
526 then the user inserts a breakpoint inside the range. In that
527 case, we need to report the breakpoint PC. But, when we're
528 trying to step past one of our own breakpoints, that happens to
529 have been placed on top of a permanent breakpoint instruction, we
530 shouldn't adjust the PC, otherwise the program would keep
531 trapping the permanent breakpoint forever. */
533 || (!ptid_equal (ptid_of (current_thread
), step_over_bkpt
)
534 && lwp
->stop_pc
== sw_breakpoint_pc
))
535 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
539 struct thread_info
*thr
= get_lwp_thread (lwp
);
541 debug_printf ("CSBB: %s stopped by software breakpoint\n",
542 target_pid_to_str (ptid_of (thr
)));
545 /* Back up the PC if necessary. */
546 if (pc
!= sw_breakpoint_pc
)
548 struct regcache
*regcache
549 = get_thread_regcache (current_thread
, 1);
550 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
553 lwp
->stop_pc
= sw_breakpoint_pc
;
554 lwp
->stop_reason
= LWP_STOPPED_BY_SW_BREAKPOINT
;
555 current_thread
= saved_thread
;
559 if (hardware_breakpoint_inserted_here (pc
))
563 struct thread_info
*thr
= get_lwp_thread (lwp
);
565 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
566 target_pid_to_str (ptid_of (thr
)));
570 lwp
->stop_reason
= LWP_STOPPED_BY_HW_BREAKPOINT
;
571 current_thread
= saved_thread
;
575 current_thread
= saved_thread
;
579 static struct lwp_info
*
580 add_lwp (ptid_t ptid
)
582 struct lwp_info
*lwp
;
584 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
585 memset (lwp
, 0, sizeof (*lwp
));
587 if (the_low_target
.new_thread
!= NULL
)
588 lwp
->arch_private
= the_low_target
.new_thread ();
590 lwp
->thread
= add_thread (ptid
, lwp
);
595 /* Start an inferior process and returns its pid.
596 ALLARGS is a vector of program-name and args. */
599 linux_create_inferior (char *program
, char **allargs
)
601 struct lwp_info
*new_lwp
;
604 struct cleanup
*restore_personality
605 = maybe_disable_address_space_randomization (disable_randomization
);
607 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
613 perror_with_name ("fork");
618 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
620 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
621 signal (__SIGRTMIN
+ 1, SIG_DFL
);
626 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
627 stdout to stderr so that inferior i/o doesn't corrupt the connection.
628 Also, redirect stdin to /dev/null. */
629 if (remote_connection_is_stdio ())
632 open ("/dev/null", O_RDONLY
);
634 if (write (2, "stdin/stdout redirected\n",
635 sizeof ("stdin/stdout redirected\n") - 1) < 0)
637 /* Errors ignored. */;
641 execv (program
, allargs
);
643 execvp (program
, allargs
);
645 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
651 do_cleanups (restore_personality
);
653 linux_add_process (pid
, 0);
655 ptid
= ptid_build (pid
, pid
, 0);
656 new_lwp
= add_lwp (ptid
);
657 new_lwp
->must_set_ptrace_flags
= 1;
662 /* Attach to an inferior process. Returns 0 on success, ERRNO on
666 linux_attach_lwp (ptid_t ptid
)
668 struct lwp_info
*new_lwp
;
669 int lwpid
= ptid_get_lwp (ptid
);
671 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
675 new_lwp
= add_lwp (ptid
);
677 /* We need to wait for SIGSTOP before being able to make the next
678 ptrace call on this LWP. */
679 new_lwp
->must_set_ptrace_flags
= 1;
681 if (linux_proc_pid_is_stopped (lwpid
))
684 debug_printf ("Attached to a stopped process\n");
686 /* The process is definitely stopped. It is in a job control
687 stop, unless the kernel predates the TASK_STOPPED /
688 TASK_TRACED distinction, in which case it might be in a
689 ptrace stop. Make sure it is in a ptrace stop; from there we
690 can kill it, signal it, et cetera.
692 First make sure there is a pending SIGSTOP. Since we are
693 already attached, the process can not transition from stopped
694 to running without a PTRACE_CONT; so we know this signal will
695 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
696 probably already in the queue (unless this kernel is old
697 enough to use TASK_STOPPED for ptrace stops); but since
698 SIGSTOP is not an RT signal, it can only be queued once. */
699 kill_lwp (lwpid
, SIGSTOP
);
701 /* Finally, resume the stopped process. This will deliver the
702 SIGSTOP (or a higher priority signal, just like normal
703 PTRACE_ATTACH), which we'll catch later on. */
704 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
707 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
710 There are several cases to consider here:
712 1) gdbserver has already attached to the process and is being notified
713 of a new thread that is being created.
714 In this case we should ignore that SIGSTOP and resume the
715 process. This is handled below by setting stop_expected = 1,
716 and the fact that add_thread sets last_resume_kind ==
719 2) This is the first thread (the process thread), and we're attaching
720 to it via attach_inferior.
721 In this case we want the process thread to stop.
722 This is handled by having linux_attach set last_resume_kind ==
723 resume_stop after we return.
725 If the pid we are attaching to is also the tgid, we attach to and
726 stop all the existing threads. Otherwise, we attach to pid and
727 ignore any other threads in the same group as this pid.
729 3) GDB is connecting to gdbserver and is requesting an enumeration of all
731 In this case we want the thread to stop.
732 FIXME: This case is currently not properly handled.
733 We should wait for the SIGSTOP but don't. Things work apparently
734 because enough time passes between when we ptrace (ATTACH) and when
735 gdb makes the next ptrace call on the thread.
737 On the other hand, if we are currently trying to stop all threads, we
738 should treat the new thread as if we had sent it a SIGSTOP. This works
739 because we are guaranteed that the add_lwp call above added us to the
740 end of the list, and so the new thread has not yet reached
741 wait_for_sigstop (but will). */
742 new_lwp
->stop_expected
= 1;
747 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
748 already attached. Returns true if a new LWP is found, false
752 attach_proc_task_lwp_callback (ptid_t ptid
)
754 /* Is this a new thread? */
755 if (find_thread_ptid (ptid
) == NULL
)
757 int lwpid
= ptid_get_lwp (ptid
);
761 debug_printf ("Found new lwp %d\n", lwpid
);
763 err
= linux_attach_lwp (ptid
);
765 /* Be quiet if we simply raced with the thread exiting. EPERM
766 is returned if the thread's task still exists, and is marked
767 as exited or zombie, as well as other conditions, so in that
768 case, confirm the status in /proc/PID/status. */
770 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
774 debug_printf ("Cannot attach to lwp %d: "
775 "thread is gone (%d: %s)\n",
776 lwpid
, err
, strerror (err
));
781 warning (_("Cannot attach to lwp %d: %s"),
783 linux_ptrace_attach_fail_reason_string (ptid
, err
));
791 /* Attach to PID. If PID is the tgid, attach to it and all
795 linux_attach (unsigned long pid
)
797 ptid_t ptid
= ptid_build (pid
, pid
, 0);
800 /* Attach to PID. We will check for other threads
802 err
= linux_attach_lwp (ptid
);
804 error ("Cannot attach to process %ld: %s",
805 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
807 linux_add_process (pid
, 1);
811 struct thread_info
*thread
;
813 /* Don't ignore the initial SIGSTOP if we just attached to this
814 process. It will be collected by wait shortly. */
815 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
816 thread
->last_resume_kind
= resume_stop
;
819 /* We must attach to every LWP. If /proc is mounted, use that to
820 find them now. On the one hand, the inferior may be using raw
821 clone instead of using pthreads. On the other hand, even if it
822 is using pthreads, GDB may not be connected yet (thread_db needs
823 to do symbol lookups, through qSymbol). Also, thread_db walks
824 structures in the inferior's address space to find the list of
825 threads/LWPs, and those structures may well be corrupted. Note
826 that once thread_db is loaded, we'll still use it to list threads
827 and associate pthread info with each LWP. */
828 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
839 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
841 struct counter
*counter
= args
;
843 if (ptid_get_pid (entry
->id
) == counter
->pid
)
845 if (++counter
->count
> 1)
853 last_thread_of_process_p (int pid
)
855 struct counter counter
= { pid
, 0 };
857 return (find_inferior (&all_threads
,
858 second_thread_of_pid_p
, &counter
) == NULL
);
864 linux_kill_one_lwp (struct lwp_info
*lwp
)
866 struct thread_info
*thr
= get_lwp_thread (lwp
);
867 int pid
= lwpid_of (thr
);
869 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
870 there is no signal context, and ptrace(PTRACE_KILL) (or
871 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
872 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
873 alternative is to kill with SIGKILL. We only need one SIGKILL
874 per process, not one for each thread. But since we still support
875 linuxthreads, and we also support debugging programs using raw
876 clone without CLONE_THREAD, we send one for each thread. For
877 years, we used PTRACE_KILL only, so we're being a bit paranoid
878 about some old kernels where PTRACE_KILL might work better
879 (dubious if there are any such, but that's why it's paranoia), so
880 we try SIGKILL first, PTRACE_KILL second, and so we're fine
884 kill_lwp (pid
, SIGKILL
);
887 int save_errno
= errno
;
889 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
890 target_pid_to_str (ptid_of (thr
)),
891 save_errno
? strerror (save_errno
) : "OK");
895 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
898 int save_errno
= errno
;
900 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
901 target_pid_to_str (ptid_of (thr
)),
902 save_errno
? strerror (save_errno
) : "OK");
906 /* Kill LWP and wait for it to die. */
909 kill_wait_lwp (struct lwp_info
*lwp
)
911 struct thread_info
*thr
= get_lwp_thread (lwp
);
912 int pid
= ptid_get_pid (ptid_of (thr
));
913 int lwpid
= ptid_get_lwp (ptid_of (thr
));
918 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
922 linux_kill_one_lwp (lwp
);
924 /* Make sure it died. Notes:
926 - The loop is most likely unnecessary.
928 - We don't use linux_wait_for_event as that could delete lwps
929 while we're iterating over them. We're not interested in
930 any pending status at this point, only in making sure all
931 wait status on the kernel side are collected until the
934 - We don't use __WALL here as the __WALL emulation relies on
935 SIGCHLD, and killing a stopped process doesn't generate
936 one, nor an exit status.
938 res
= my_waitpid (lwpid
, &wstat
, 0);
939 if (res
== -1 && errno
== ECHILD
)
940 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
941 } while (res
> 0 && WIFSTOPPED (wstat
));
943 gdb_assert (res
> 0);
946 /* Callback for `find_inferior'. Kills an lwp of a given process,
947 except the leader. */
950 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
952 struct thread_info
*thread
= (struct thread_info
*) entry
;
953 struct lwp_info
*lwp
= get_thread_lwp (thread
);
954 int pid
= * (int *) args
;
956 if (ptid_get_pid (entry
->id
) != pid
)
959 /* We avoid killing the first thread here, because of a Linux kernel (at
960 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
961 the children get a chance to be reaped, it will remain a zombie
964 if (lwpid_of (thread
) == pid
)
967 debug_printf ("lkop: is last of process %s\n",
968 target_pid_to_str (entry
->id
));
979 struct process_info
*process
;
980 struct lwp_info
*lwp
;
982 process
= find_process_pid (pid
);
986 /* If we're killing a running inferior, make sure it is stopped
987 first, as PTRACE_KILL will not work otherwise. */
988 stop_all_lwps (0, NULL
);
990 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
992 /* See the comment in linux_kill_one_lwp. We did not kill the first
993 thread in the list, so do so now. */
994 lwp
= find_lwp_pid (pid_to_ptid (pid
));
999 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1003 kill_wait_lwp (lwp
);
1005 the_target
->mourn (process
);
1007 /* Since we presently can only stop all lwps of all processes, we
1008 need to unstop lwps of other processes. */
1009 unstop_all_lwps (0, NULL
);
1013 /* Get pending signal of THREAD, for detaching purposes. This is the
1014 signal the thread last stopped for, which we need to deliver to the
1015 thread when detaching, otherwise, it'd be suppressed/lost. */
1018 get_detach_signal (struct thread_info
*thread
)
1020 enum gdb_signal signo
= GDB_SIGNAL_0
;
1022 struct lwp_info
*lp
= get_thread_lwp (thread
);
1024 if (lp
->status_pending_p
)
1025 status
= lp
->status_pending
;
1028 /* If the thread had been suspended by gdbserver, and it stopped
1029 cleanly, then it'll have stopped with SIGSTOP. But we don't
1030 want to deliver that SIGSTOP. */
1031 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1032 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1035 /* Otherwise, we may need to deliver the signal we
1037 status
= lp
->last_status
;
1040 if (!WIFSTOPPED (status
))
1043 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1044 target_pid_to_str (ptid_of (thread
)));
1048 /* Extended wait statuses aren't real SIGTRAPs. */
1049 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1052 debug_printf ("GPS: lwp %s had stopped with extended "
1053 "status: no pending signal\n",
1054 target_pid_to_str (ptid_of (thread
)));
1058 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1060 if (program_signals_p
&& !program_signals
[signo
])
1063 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1064 target_pid_to_str (ptid_of (thread
)),
1065 gdb_signal_to_string (signo
));
1068 else if (!program_signals_p
1069 /* If we have no way to know which signals GDB does not
1070 want to have passed to the program, assume
1071 SIGTRAP/SIGINT, which is GDB's default. */
1072 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1075 debug_printf ("GPS: lwp %s had signal %s, "
1076 "but we don't know if we should pass it. "
1077 "Default to not.\n",
1078 target_pid_to_str (ptid_of (thread
)),
1079 gdb_signal_to_string (signo
));
1085 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1086 target_pid_to_str (ptid_of (thread
)),
1087 gdb_signal_to_string (signo
));
1089 return WSTOPSIG (status
);
1094 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1096 struct thread_info
*thread
= (struct thread_info
*) entry
;
1097 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1098 int pid
= * (int *) args
;
1101 if (ptid_get_pid (entry
->id
) != pid
)
1104 /* If there is a pending SIGSTOP, get rid of it. */
1105 if (lwp
->stop_expected
)
1108 debug_printf ("Sending SIGCONT to %s\n",
1109 target_pid_to_str (ptid_of (thread
)));
1111 kill_lwp (lwpid_of (thread
), SIGCONT
);
1112 lwp
->stop_expected
= 0;
1115 /* Flush any pending changes to the process's registers. */
1116 regcache_invalidate_thread (thread
);
1118 /* Pass on any pending signal for this thread. */
1119 sig
= get_detach_signal (thread
);
1121 /* Finally, let it resume. */
1122 if (the_low_target
.prepare_to_resume
!= NULL
)
1123 the_low_target
.prepare_to_resume (lwp
);
1124 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1125 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1126 error (_("Can't detach %s: %s"),
1127 target_pid_to_str (ptid_of (thread
)),
1135 linux_detach (int pid
)
1137 struct process_info
*process
;
1139 process
= find_process_pid (pid
);
1140 if (process
== NULL
)
1143 /* Stop all threads before detaching. First, ptrace requires that
1144 the thread is stopped to sucessfully detach. Second, thread_db
1145 may need to uninstall thread event breakpoints from memory, which
1146 only works with a stopped process anyway. */
1147 stop_all_lwps (0, NULL
);
1149 #ifdef USE_THREAD_DB
1150 thread_db_detach (process
);
1153 /* Stabilize threads (move out of jump pads). */
1154 stabilize_threads ();
1156 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1158 the_target
->mourn (process
);
1160 /* Since we presently can only stop all lwps of all processes, we
1161 need to unstop lwps of other processes. */
1162 unstop_all_lwps (0, NULL
);
1166 /* Remove all LWPs that belong to process PROC from the lwp list. */
1169 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1171 struct thread_info
*thread
= (struct thread_info
*) entry
;
1172 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1173 struct process_info
*process
= proc
;
1175 if (pid_of (thread
) == pid_of (process
))
1182 linux_mourn (struct process_info
*process
)
1184 struct process_info_private
*priv
;
1186 #ifdef USE_THREAD_DB
1187 thread_db_mourn (process
);
1190 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1192 /* Freeing all private data. */
1193 priv
= process
->private;
1194 free (priv
->arch_private
);
1196 process
->private = NULL
;
1198 remove_process (process
);
1202 linux_join (int pid
)
1207 ret
= my_waitpid (pid
, &status
, 0);
1208 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1210 } while (ret
!= -1 || errno
!= ECHILD
);
1213 /* Return nonzero if the given thread is still alive. */
1215 linux_thread_alive (ptid_t ptid
)
1217 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1219 /* We assume we always know if a thread exits. If a whole process
1220 exited but we still haven't been able to report it to GDB, we'll
1221 hold on to the last lwp of the dead process. */
1228 /* Return 1 if this lwp still has an interesting status pending. If
1229 not (e.g., it had stopped for a breakpoint that is gone), return
1233 thread_still_has_status_pending_p (struct thread_info
*thread
)
1235 struct lwp_info
*lp
= get_thread_lwp (thread
);
1237 if (!lp
->status_pending_p
)
1240 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1241 report any status pending the LWP may have. */
1242 if (thread
->last_resume_kind
== resume_stop
1243 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1246 if (thread
->last_resume_kind
!= resume_stop
1247 && (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1248 || lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
))
1250 struct thread_info
*saved_thread
;
1254 gdb_assert (lp
->last_status
!= 0);
1258 saved_thread
= current_thread
;
1259 current_thread
= thread
;
1261 if (pc
!= lp
->stop_pc
)
1264 debug_printf ("PC of %ld changed\n",
1268 else if (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1269 && !(*the_low_target
.breakpoint_at
) (pc
))
1272 debug_printf ("previous SW breakpoint of %ld gone\n",
1276 else if (lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
1277 && !hardware_breakpoint_inserted_here (pc
))
1280 debug_printf ("previous HW breakpoint of %ld gone\n",
1285 current_thread
= saved_thread
;
1290 debug_printf ("discarding pending breakpoint status\n");
1291 lp
->status_pending_p
= 0;
1299 /* Return 1 if this lwp has an interesting status pending. */
1301 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1303 struct thread_info
*thread
= (struct thread_info
*) entry
;
1304 struct lwp_info
*lp
= get_thread_lwp (thread
);
1305 ptid_t ptid
= * (ptid_t
*) arg
;
1307 /* Check if we're only interested in events from a specific process
1309 if (!ptid_equal (minus_one_ptid
, ptid
)
1310 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1313 if (lp
->status_pending_p
1314 && !thread_still_has_status_pending_p (thread
))
1316 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1320 return lp
->status_pending_p
;
1324 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1326 ptid_t ptid
= *(ptid_t
*) data
;
1329 if (ptid_get_lwp (ptid
) != 0)
1330 lwp
= ptid_get_lwp (ptid
);
1332 lwp
= ptid_get_pid (ptid
);
1334 if (ptid_get_lwp (entry
->id
) == lwp
)
1341 find_lwp_pid (ptid_t ptid
)
1343 struct inferior_list_entry
*thread
1344 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1349 return get_thread_lwp ((struct thread_info
*) thread
);
1352 /* Return the number of known LWPs in the tgid given by PID. */
1357 struct inferior_list_entry
*inf
, *tmp
;
1360 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1362 if (ptid_get_pid (inf
->id
) == pid
)
1369 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1370 their exits until all other threads in the group have exited. */
1373 check_zombie_leaders (void)
1375 struct process_info
*proc
, *tmp
;
1377 ALL_PROCESSES (proc
, tmp
)
1379 pid_t leader_pid
= pid_of (proc
);
1380 struct lwp_info
*leader_lp
;
1382 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1385 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1386 "num_lwps=%d, zombie=%d\n",
1387 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1388 linux_proc_pid_is_zombie (leader_pid
));
1390 if (leader_lp
!= NULL
1391 /* Check if there are other threads in the group, as we may
1392 have raced with the inferior simply exiting. */
1393 && !last_thread_of_process_p (leader_pid
)
1394 && linux_proc_pid_is_zombie (leader_pid
))
1396 /* A leader zombie can mean one of two things:
1398 - It exited, and there's an exit status pending
1399 available, or only the leader exited (not the whole
1400 program). In the latter case, we can't waitpid the
1401 leader's exit status until all other threads are gone.
1403 - There are 3 or more threads in the group, and a thread
1404 other than the leader exec'd. On an exec, the Linux
1405 kernel destroys all other threads (except the execing
1406 one) in the thread group, and resets the execing thread's
1407 tid to the tgid. No exit notification is sent for the
1408 execing thread -- from the ptracer's perspective, it
1409 appears as though the execing thread just vanishes.
1410 Until we reap all other threads except the leader and the
1411 execing thread, the leader will be zombie, and the
1412 execing thread will be in `D (disc sleep)'. As soon as
1413 all other threads are reaped, the execing thread changes
1414 it's tid to the tgid, and the previous (zombie) leader
1415 vanishes, giving place to the "new" leader. We could try
1416 distinguishing the exit and exec cases, by waiting once
1417 more, and seeing if something comes out, but it doesn't
1418 sound useful. The previous leader _does_ go away, and
1419 we'll re-add the new one once we see the exec event
1420 (which is just the same as what would happen if the
1421 previous leader did exit voluntarily before some other
1426 "CZL: Thread group leader %d zombie "
1427 "(it exited, or another thread execd).\n",
1430 delete_lwp (leader_lp
);
1435 /* Callback for `find_inferior'. Returns the first LWP that is not
1436 stopped. ARG is a PTID filter. */
1439 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1441 struct thread_info
*thr
= (struct thread_info
*) entry
;
1442 struct lwp_info
*lwp
;
1443 ptid_t filter
= *(ptid_t
*) arg
;
1445 if (!ptid_match (ptid_of (thr
), filter
))
1448 lwp
= get_thread_lwp (thr
);
1455 /* This function should only be called if the LWP got a SIGTRAP.
1457 Handle any tracepoint steps or hits. Return true if a tracepoint
1458 event was handled, 0 otherwise. */
1461 handle_tracepoints (struct lwp_info
*lwp
)
1463 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1464 int tpoint_related_event
= 0;
1466 gdb_assert (lwp
->suspended
== 0);
1468 /* If this tracepoint hit causes a tracing stop, we'll immediately
1469 uninsert tracepoints. To do this, we temporarily pause all
1470 threads, unpatch away, and then unpause threads. We need to make
1471 sure the unpausing doesn't resume LWP too. */
1474 /* And we need to be sure that any all-threads-stopping doesn't try
1475 to move threads out of the jump pads, as it could deadlock the
1476 inferior (LWP could be in the jump pad, maybe even holding the
1479 /* Do any necessary step collect actions. */
1480 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1482 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1484 /* See if we just hit a tracepoint and do its main collect
1486 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1490 gdb_assert (lwp
->suspended
== 0);
1491 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1493 if (tpoint_related_event
)
1496 debug_printf ("got a tracepoint event\n");
1503 /* Convenience wrapper. Returns true if LWP is presently collecting a
1507 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1508 struct fast_tpoint_collect_status
*status
)
1510 CORE_ADDR thread_area
;
1511 struct thread_info
*thread
= get_lwp_thread (lwp
);
1513 if (the_low_target
.get_thread_area
== NULL
)
1516 /* Get the thread area address. This is used to recognize which
1517 thread is which when tracing with the in-process agent library.
1518 We don't read anything from the address, and treat it as opaque;
1519 it's the address itself that we assume is unique per-thread. */
1520 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1523 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1526 /* The reason we resume in the caller, is because we want to be able
1527 to pass lwp->status_pending as WSTAT, and we need to clear
1528 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1529 refuses to resume. */
1532 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1534 struct thread_info
*saved_thread
;
1536 saved_thread
= current_thread
;
1537 current_thread
= get_lwp_thread (lwp
);
1540 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1541 && supports_fast_tracepoints ()
1542 && agent_loaded_p ())
1544 struct fast_tpoint_collect_status status
;
1548 debug_printf ("Checking whether LWP %ld needs to move out of the "
1550 lwpid_of (current_thread
));
1552 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1555 || (WSTOPSIG (*wstat
) != SIGILL
1556 && WSTOPSIG (*wstat
) != SIGFPE
1557 && WSTOPSIG (*wstat
) != SIGSEGV
1558 && WSTOPSIG (*wstat
) != SIGBUS
))
1560 lwp
->collecting_fast_tracepoint
= r
;
1564 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1566 /* Haven't executed the original instruction yet.
1567 Set breakpoint there, and wait till it's hit,
1568 then single-step until exiting the jump pad. */
1569 lwp
->exit_jump_pad_bkpt
1570 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1574 debug_printf ("Checking whether LWP %ld needs to move out of "
1575 "the jump pad...it does\n",
1576 lwpid_of (current_thread
));
1577 current_thread
= saved_thread
;
1584 /* If we get a synchronous signal while collecting, *and*
1585 while executing the (relocated) original instruction,
1586 reset the PC to point at the tpoint address, before
1587 reporting to GDB. Otherwise, it's an IPA lib bug: just
1588 report the signal to GDB, and pray for the best. */
1590 lwp
->collecting_fast_tracepoint
= 0;
1593 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1594 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1597 struct regcache
*regcache
;
1599 /* The si_addr on a few signals references the address
1600 of the faulting instruction. Adjust that as
1602 if ((WSTOPSIG (*wstat
) == SIGILL
1603 || WSTOPSIG (*wstat
) == SIGFPE
1604 || WSTOPSIG (*wstat
) == SIGBUS
1605 || WSTOPSIG (*wstat
) == SIGSEGV
)
1606 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1607 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1608 /* Final check just to make sure we don't clobber
1609 the siginfo of non-kernel-sent signals. */
1610 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1612 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1613 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1614 (PTRACE_TYPE_ARG3
) 0, &info
);
1617 regcache
= get_thread_regcache (current_thread
, 1);
1618 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1619 lwp
->stop_pc
= status
.tpoint_addr
;
1621 /* Cancel any fast tracepoint lock this thread was
1623 force_unlock_trace_buffer ();
1626 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1629 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1630 "stopping all threads momentarily.\n");
1632 stop_all_lwps (1, lwp
);
1634 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1635 lwp
->exit_jump_pad_bkpt
= NULL
;
1637 unstop_all_lwps (1, lwp
);
1639 gdb_assert (lwp
->suspended
>= 0);
1645 debug_printf ("Checking whether LWP %ld needs to move out of the "
1647 lwpid_of (current_thread
));
1649 current_thread
= saved_thread
;
1653 /* Enqueue one signal in the "signals to report later when out of the
1657 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1659 struct pending_signals
*p_sig
;
1660 struct thread_info
*thread
= get_lwp_thread (lwp
);
1663 debug_printf ("Deferring signal %d for LWP %ld.\n",
1664 WSTOPSIG (*wstat
), lwpid_of (thread
));
1668 struct pending_signals
*sig
;
1670 for (sig
= lwp
->pending_signals_to_report
;
1673 debug_printf (" Already queued %d\n",
1676 debug_printf (" (no more currently queued signals)\n");
1679 /* Don't enqueue non-RT signals if they are already in the deferred
1680 queue. (SIGSTOP being the easiest signal to see ending up here
1682 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1684 struct pending_signals
*sig
;
1686 for (sig
= lwp
->pending_signals_to_report
;
1690 if (sig
->signal
== WSTOPSIG (*wstat
))
1693 debug_printf ("Not requeuing already queued non-RT signal %d"
1702 p_sig
= xmalloc (sizeof (*p_sig
));
1703 p_sig
->prev
= lwp
->pending_signals_to_report
;
1704 p_sig
->signal
= WSTOPSIG (*wstat
);
1705 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1706 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1709 lwp
->pending_signals_to_report
= p_sig
;
1712 /* Dequeue one signal from the "signals to report later when out of
1713 the jump pad" list. */
1716 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1718 struct thread_info
*thread
= get_lwp_thread (lwp
);
1720 if (lwp
->pending_signals_to_report
!= NULL
)
1722 struct pending_signals
**p_sig
;
1724 p_sig
= &lwp
->pending_signals_to_report
;
1725 while ((*p_sig
)->prev
!= NULL
)
1726 p_sig
= &(*p_sig
)->prev
;
1728 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1729 if ((*p_sig
)->info
.si_signo
!= 0)
1730 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1736 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1737 WSTOPSIG (*wstat
), lwpid_of (thread
));
1741 struct pending_signals
*sig
;
1743 for (sig
= lwp
->pending_signals_to_report
;
1746 debug_printf (" Still queued %d\n",
1749 debug_printf (" (no more queued signals)\n");
1758 /* Return true if the event in LP may be caused by breakpoint. */
1761 wstatus_maybe_breakpoint (int wstatus
)
1763 return (WIFSTOPPED (wstatus
)
1764 && (WSTOPSIG (wstatus
) == SIGTRAP
1765 /* SIGILL and SIGSEGV are also treated as traps in case a
1766 breakpoint is inserted at the current PC. */
1767 || WSTOPSIG (wstatus
) == SIGILL
1768 || WSTOPSIG (wstatus
) == SIGSEGV
));
1771 /* Fetch the possibly triggered data watchpoint info and store it in
1774 On some archs, like x86, that use debug registers to set
1775 watchpoints, it's possible that the way to know which watched
1776 address trapped, is to check the register that is used to select
1777 which address to watch. Problem is, between setting the watchpoint
1778 and reading back which data address trapped, the user may change
1779 the set of watchpoints, and, as a consequence, GDB changes the
1780 debug registers in the inferior. To avoid reading back a stale
1781 stopped-data-address when that happens, we cache in LP the fact
1782 that a watchpoint trapped, and the corresponding data address, as
1783 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1784 registers meanwhile, we have the cached data we can rely on. */
1787 check_stopped_by_watchpoint (struct lwp_info
*child
)
1789 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1791 struct thread_info
*saved_thread
;
1793 saved_thread
= current_thread
;
1794 current_thread
= get_lwp_thread (child
);
1796 if (the_low_target
.stopped_by_watchpoint ())
1798 child
->stop_reason
= LWP_STOPPED_BY_WATCHPOINT
;
1800 if (the_low_target
.stopped_data_address
!= NULL
)
1801 child
->stopped_data_address
1802 = the_low_target
.stopped_data_address ();
1804 child
->stopped_data_address
= 0;
1807 current_thread
= saved_thread
;
1810 return child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
1813 /* Do low-level handling of the event, and check if we should go on
1814 and pass it to caller code. Return the affected lwp if we are, or
1817 static struct lwp_info
*
1818 linux_low_filter_event (int lwpid
, int wstat
)
1820 struct lwp_info
*child
;
1821 struct thread_info
*thread
;
1822 int have_stop_pc
= 0;
1824 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1826 /* If we didn't find a process, one of two things presumably happened:
1827 - A process we started and then detached from has exited. Ignore it.
1828 - A process we are controlling has forked and the new child's stop
1829 was reported to us by the kernel. Save its PID. */
1830 if (child
== NULL
&& WIFSTOPPED (wstat
))
1832 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1835 else if (child
== NULL
)
1838 thread
= get_lwp_thread (child
);
1842 child
->last_status
= wstat
;
1844 /* Check if the thread has exited. */
1845 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1848 debug_printf ("LLFE: %d exited.\n", lwpid
);
1849 if (num_lwps (pid_of (thread
)) > 1)
1852 /* If there is at least one more LWP, then the exit signal was
1853 not the end of the debugged application and should be
1860 /* This was the last lwp in the process. Since events are
1861 serialized to GDB core, and we can't report this one
1862 right now, but GDB core and the other target layers will
1863 want to be notified about the exit code/signal, leave the
1864 status pending for the next time we're able to report
1866 mark_lwp_dead (child
, wstat
);
1871 gdb_assert (WIFSTOPPED (wstat
));
1873 if (WIFSTOPPED (wstat
))
1875 struct process_info
*proc
;
1877 /* Architecture-specific setup after inferior is running. This
1878 needs to happen after we have attached to the inferior and it
1879 is stopped for the first time, but before we access any
1880 inferior registers. */
1881 proc
= find_process_pid (pid_of (thread
));
1882 if (proc
->private->new_inferior
)
1884 struct thread_info
*saved_thread
;
1886 saved_thread
= current_thread
;
1887 current_thread
= thread
;
1889 the_low_target
.arch_setup ();
1891 current_thread
= saved_thread
;
1893 proc
->private->new_inferior
= 0;
1897 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1899 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1901 linux_enable_event_reporting (lwpid
, proc
->attached
);
1902 child
->must_set_ptrace_flags
= 0;
1905 /* Be careful to not overwrite stop_pc until
1906 check_stopped_by_breakpoint is called. */
1907 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1908 && linux_is_extended_waitstatus (wstat
))
1910 child
->stop_pc
= get_pc (child
);
1911 handle_extended_wait (child
, wstat
);
1915 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1916 && check_stopped_by_watchpoint (child
))
1918 else if (WIFSTOPPED (wstat
) && wstatus_maybe_breakpoint (wstat
))
1920 if (check_stopped_by_breakpoint (child
))
1925 child
->stop_pc
= get_pc (child
);
1927 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1928 && child
->stop_expected
)
1931 debug_printf ("Expected stop.\n");
1932 child
->stop_expected
= 0;
1934 if (thread
->last_resume_kind
== resume_stop
)
1936 /* We want to report the stop to the core. Treat the
1937 SIGSTOP as a normal event. */
1939 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1941 /* Stopping threads. We don't want this SIGSTOP to end up
1947 /* Filter out the event. */
1948 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1953 child
->status_pending_p
= 1;
1954 child
->status_pending
= wstat
;
1958 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1959 match FILTER_PTID (leaving others pending). The PTIDs can be:
1960 minus_one_ptid, to specify any child; a pid PTID, specifying all
1961 lwps of a thread group; or a PTID representing a single lwp. Store
1962 the stop status through the status pointer WSTAT. OPTIONS is
1963 passed to the waitpid call. Return 0 if no event was found and
1964 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1965 was found. Return the PID of the stopped child otherwise. */
1968 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1969 int *wstatp
, int options
)
1971 struct thread_info
*event_thread
;
1972 struct lwp_info
*event_child
, *requested_child
;
1973 sigset_t block_mask
, prev_mask
;
1976 /* N.B. event_thread points to the thread_info struct that contains
1977 event_child. Keep them in sync. */
1978 event_thread
= NULL
;
1980 requested_child
= NULL
;
1982 /* Check for a lwp with a pending status. */
1984 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
1986 event_thread
= (struct thread_info
*)
1987 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
1988 if (event_thread
!= NULL
)
1989 event_child
= get_thread_lwp (event_thread
);
1990 if (debug_threads
&& event_thread
)
1991 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
1993 else if (!ptid_equal (filter_ptid
, null_ptid
))
1995 requested_child
= find_lwp_pid (filter_ptid
);
1997 if (stopping_threads
== NOT_STOPPING_THREADS
1998 && requested_child
->status_pending_p
1999 && requested_child
->collecting_fast_tracepoint
)
2001 enqueue_one_deferred_signal (requested_child
,
2002 &requested_child
->status_pending
);
2003 requested_child
->status_pending_p
= 0;
2004 requested_child
->status_pending
= 0;
2005 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2008 if (requested_child
->suspended
2009 && requested_child
->status_pending_p
)
2011 internal_error (__FILE__
, __LINE__
,
2012 "requesting an event out of a"
2013 " suspended child?");
2016 if (requested_child
->status_pending_p
)
2018 event_child
= requested_child
;
2019 event_thread
= get_lwp_thread (event_child
);
2023 if (event_child
!= NULL
)
2026 debug_printf ("Got an event from pending child %ld (%04x)\n",
2027 lwpid_of (event_thread
), event_child
->status_pending
);
2028 *wstatp
= event_child
->status_pending
;
2029 event_child
->status_pending_p
= 0;
2030 event_child
->status_pending
= 0;
2031 current_thread
= event_thread
;
2032 return lwpid_of (event_thread
);
2035 /* But if we don't find a pending event, we'll have to wait.
2037 We only enter this loop if no process has a pending wait status.
2038 Thus any action taken in response to a wait status inside this
2039 loop is responding as soon as we detect the status, not after any
2042 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2043 all signals while here. */
2044 sigfillset (&block_mask
);
2045 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2047 /* Always pull all events out of the kernel. We'll randomly select
2048 an event LWP out of all that have events, to prevent
2050 while (event_child
== NULL
)
2054 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2057 - If the thread group leader exits while other threads in the
2058 thread group still exist, waitpid(TGID, ...) hangs. That
2059 waitpid won't return an exit status until the other threads
2060 in the group are reaped.
2062 - When a non-leader thread execs, that thread just vanishes
2063 without reporting an exit (so we'd hang if we waited for it
2064 explicitly in that case). The exec event is reported to
2065 the TGID pid (although we don't currently enable exec
2068 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2071 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2072 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2078 debug_printf ("LLW: waitpid %ld received %s\n",
2079 (long) ret
, status_to_str (*wstatp
));
2082 /* Filter all events. IOW, leave all events pending. We'll
2083 randomly select an event LWP out of all that have events
2085 linux_low_filter_event (ret
, *wstatp
);
2086 /* Retry until nothing comes out of waitpid. A single
2087 SIGCHLD can indicate more than one child stopped. */
2091 /* Now that we've pulled all events out of the kernel, check if
2092 there's any LWP with a status to report to the core. */
2093 event_thread
= (struct thread_info
*)
2094 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2095 if (event_thread
!= NULL
)
2097 event_child
= get_thread_lwp (event_thread
);
2098 *wstatp
= event_child
->status_pending
;
2099 event_child
->status_pending_p
= 0;
2100 event_child
->status_pending
= 0;
2104 /* Check for zombie thread group leaders. Those can't be reaped
2105 until all other threads in the thread group are. */
2106 check_zombie_leaders ();
2108 /* If there are no resumed children left in the set of LWPs we
2109 want to wait for, bail. We can't just block in
2110 waitpid/sigsuspend, because lwps might have been left stopped
2111 in trace-stop state, and we'd be stuck forever waiting for
2112 their status to change (which would only happen if we resumed
2113 them). Even if WNOHANG is set, this return code is preferred
2114 over 0 (below), as it is more detailed. */
2115 if ((find_inferior (&all_threads
,
2116 not_stopped_callback
,
2117 &wait_ptid
) == NULL
))
2120 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2121 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2125 /* No interesting event to report to the caller. */
2126 if ((options
& WNOHANG
))
2129 debug_printf ("WNOHANG set, no event found\n");
2131 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2135 /* Block until we get an event reported with SIGCHLD. */
2137 debug_printf ("sigsuspend'ing\n");
2139 sigsuspend (&prev_mask
);
2140 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2144 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2146 current_thread
= event_thread
;
2148 /* Check for thread exit. */
2149 if (! WIFSTOPPED (*wstatp
))
2151 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2154 debug_printf ("LWP %d is the last lwp of process. "
2155 "Process %ld exiting.\n",
2156 pid_of (event_thread
), lwpid_of (event_thread
));
2157 return lwpid_of (event_thread
);
2160 return lwpid_of (event_thread
);
2163 /* Wait for an event from child(ren) PTID. PTIDs can be:
2164 minus_one_ptid, to specify any child; a pid PTID, specifying all
2165 lwps of a thread group; or a PTID representing a single lwp. Store
2166 the stop status through the status pointer WSTAT. OPTIONS is
2167 passed to the waitpid call. Return 0 if no event was found and
2168 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2169 was found. Return the PID of the stopped child otherwise. */
2172 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2174 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2177 /* Count the LWP's that have had events. */
2180 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2182 struct thread_info
*thread
= (struct thread_info
*) entry
;
2185 gdb_assert (count
!= NULL
);
2187 /* Count only resumed LWPs that have an event pending. */
2188 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2189 && thread
->last_resume_kind
!= resume_stop
2190 && thread
->status_pending_p
)
2196 /* Select the LWP (if any) that is currently being single-stepped. */
2199 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2201 struct thread_info
*thread
= (struct thread_info
*) entry
;
2202 struct lwp_info
*lp
= get_thread_lwp (thread
);
2204 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2205 && thread
->last_resume_kind
== resume_step
2206 && lp
->status_pending_p
)
2212 /* Select the Nth LWP that has had a SIGTRAP event that should be
2216 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2218 struct thread_info
*thread
= (struct thread_info
*) entry
;
2219 int *selector
= data
;
2221 gdb_assert (selector
!= NULL
);
2223 /* Select only resumed LWPs that have an event pending. */
2224 if (thread
->last_resume_kind
!= resume_stop
2225 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2226 && thread
->status_pending_p
)
2227 if ((*selector
)-- == 0)
2233 /* Select one LWP out of those that have events pending. */
2236 select_event_lwp (struct lwp_info
**orig_lp
)
2239 int random_selector
;
2240 struct thread_info
*event_thread
= NULL
;
2242 /* In all-stop, give preference to the LWP that is being
2243 single-stepped. There will be at most one, and it's the LWP that
2244 the core is most interested in. If we didn't do this, then we'd
2245 have to handle pending step SIGTRAPs somehow in case the core
2246 later continues the previously-stepped thread, otherwise we'd
2247 report the pending SIGTRAP, and the core, not having stepped the
2248 thread, wouldn't understand what the trap was for, and therefore
2249 would report it to the user as a random signal. */
2253 = (struct thread_info
*) find_inferior (&all_threads
,
2254 select_singlestep_lwp_callback
,
2256 if (event_thread
!= NULL
)
2259 debug_printf ("SEL: Select single-step %s\n",
2260 target_pid_to_str (ptid_of (event_thread
)));
2263 if (event_thread
== NULL
)
2265 /* No single-stepping LWP. Select one at random, out of those
2266 which have had SIGTRAP events. */
2268 /* First see how many SIGTRAP events we have. */
2269 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2271 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2272 random_selector
= (int)
2273 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2275 if (debug_threads
&& num_events
> 1)
2276 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2277 num_events
, random_selector
);
2280 = (struct thread_info
*) find_inferior (&all_threads
,
2281 select_event_lwp_callback
,
2285 if (event_thread
!= NULL
)
2287 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2289 /* Switch the event LWP. */
2290 *orig_lp
= event_lp
;
2294 /* Decrement the suspend count of an LWP. */
2297 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2299 struct thread_info
*thread
= (struct thread_info
*) entry
;
2300 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2302 /* Ignore EXCEPT. */
2308 gdb_assert (lwp
->suspended
>= 0);
2312 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2316 unsuspend_all_lwps (struct lwp_info
*except
)
2318 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2321 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2322 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2324 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2325 static ptid_t
linux_wait_1 (ptid_t ptid
,
2326 struct target_waitstatus
*ourstatus
,
2327 int target_options
);
2329 /* Stabilize threads (move out of jump pads).
2331 If a thread is midway collecting a fast tracepoint, we need to
2332 finish the collection and move it out of the jump pad before
2333 reporting the signal.
2335 This avoids recursion while collecting (when a signal arrives
2336 midway, and the signal handler itself collects), which would trash
2337 the trace buffer. In case the user set a breakpoint in a signal
2338 handler, this avoids the backtrace showing the jump pad, etc..
2339 Most importantly, there are certain things we can't do safely if
2340 threads are stopped in a jump pad (or in its callee's). For
2343 - starting a new trace run. A thread still collecting the
2344 previous run, could trash the trace buffer when resumed. The trace
2345 buffer control structures would have been reset but the thread had
2346 no way to tell. The thread could even midway memcpy'ing to the
2347 buffer, which would mean that when resumed, it would clobber the
2348 trace buffer that had been set for a new run.
2350 - we can't rewrite/reuse the jump pads for new tracepoints
2351 safely. Say you do tstart while a thread is stopped midway while
2352 collecting. When the thread is later resumed, it finishes the
2353 collection, and returns to the jump pad, to execute the original
2354 instruction that was under the tracepoint jump at the time the
2355 older run had been started. If the jump pad had been rewritten
2356 since for something else in the new run, the thread would now
2357 execute the wrong / random instructions. */
2360 linux_stabilize_threads (void)
2362 struct thread_info
*saved_thread
;
2363 struct thread_info
*thread_stuck
;
2366 = (struct thread_info
*) find_inferior (&all_threads
,
2367 stuck_in_jump_pad_callback
,
2369 if (thread_stuck
!= NULL
)
2372 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2373 lwpid_of (thread_stuck
));
2377 saved_thread
= current_thread
;
2379 stabilizing_threads
= 1;
2382 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2384 /* Loop until all are stopped out of the jump pads. */
2385 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2387 struct target_waitstatus ourstatus
;
2388 struct lwp_info
*lwp
;
2391 /* Note that we go through the full wait even loop. While
2392 moving threads out of jump pad, we need to be able to step
2393 over internal breakpoints and such. */
2394 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2396 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2398 lwp
= get_thread_lwp (current_thread
);
2403 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2404 || current_thread
->last_resume_kind
== resume_stop
)
2406 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2407 enqueue_one_deferred_signal (lwp
, &wstat
);
2412 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2414 stabilizing_threads
= 0;
2416 current_thread
= saved_thread
;
2421 = (struct thread_info
*) find_inferior (&all_threads
,
2422 stuck_in_jump_pad_callback
,
2424 if (thread_stuck
!= NULL
)
2425 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2426 lwpid_of (thread_stuck
));
2430 static void async_file_mark (void);
2432 /* Convenience function that is called when the kernel reports an
2433 event that is not passed out to GDB. */
2436 ignore_event (struct target_waitstatus
*ourstatus
)
2438 /* If we got an event, there may still be others, as a single
2439 SIGCHLD can indicate more than one child stopped. This forces
2440 another target_wait call. */
2443 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2447 /* Wait for process, returns status. */
2450 linux_wait_1 (ptid_t ptid
,
2451 struct target_waitstatus
*ourstatus
, int target_options
)
2454 struct lwp_info
*event_child
;
2457 int step_over_finished
;
2458 int bp_explains_trap
;
2459 int maybe_internal_trap
;
2467 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2470 /* Translate generic target options into linux options. */
2472 if (target_options
& TARGET_WNOHANG
)
2475 bp_explains_trap
= 0;
2478 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2480 if (ptid_equal (step_over_bkpt
, null_ptid
))
2481 pid
= linux_wait_for_event (ptid
, &w
, options
);
2485 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2486 target_pid_to_str (step_over_bkpt
));
2487 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2492 gdb_assert (target_options
& TARGET_WNOHANG
);
2496 debug_printf ("linux_wait_1 ret = null_ptid, "
2497 "TARGET_WAITKIND_IGNORE\n");
2501 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2508 debug_printf ("linux_wait_1 ret = null_ptid, "
2509 "TARGET_WAITKIND_NO_RESUMED\n");
2513 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2517 event_child
= get_thread_lwp (current_thread
);
2519 /* linux_wait_for_event only returns an exit status for the last
2520 child of a process. Report it. */
2521 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2525 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2526 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2530 debug_printf ("linux_wait_1 ret = %s, exited with "
2532 target_pid_to_str (ptid_of (current_thread
)),
2539 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2540 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2544 debug_printf ("linux_wait_1 ret = %s, terminated with "
2546 target_pid_to_str (ptid_of (current_thread
)),
2552 return ptid_of (current_thread
);
2555 /* If this event was not handled before, and is not a SIGTRAP, we
2556 report it. SIGILL and SIGSEGV are also treated as traps in case
2557 a breakpoint is inserted at the current PC. If this target does
2558 not support internal breakpoints at all, we also report the
2559 SIGTRAP without further processing; it's of no concern to us. */
2561 = (supports_breakpoints ()
2562 && (WSTOPSIG (w
) == SIGTRAP
2563 || ((WSTOPSIG (w
) == SIGILL
2564 || WSTOPSIG (w
) == SIGSEGV
)
2565 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2567 if (maybe_internal_trap
)
2569 /* Handle anything that requires bookkeeping before deciding to
2570 report the event or continue waiting. */
2572 /* First check if we can explain the SIGTRAP with an internal
2573 breakpoint, or if we should possibly report the event to GDB.
2574 Do this before anything that may remove or insert a
2576 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2578 /* We have a SIGTRAP, possibly a step-over dance has just
2579 finished. If so, tweak the state machine accordingly,
2580 reinsert breakpoints and delete any reinsert (software
2581 single-step) breakpoints. */
2582 step_over_finished
= finish_step_over (event_child
);
2584 /* Now invoke the callbacks of any internal breakpoints there. */
2585 check_breakpoints (event_child
->stop_pc
);
2587 /* Handle tracepoint data collecting. This may overflow the
2588 trace buffer, and cause a tracing stop, removing
2590 trace_event
= handle_tracepoints (event_child
);
2592 if (bp_explains_trap
)
2594 /* If we stepped or ran into an internal breakpoint, we've
2595 already handled it. So next time we resume (from this
2596 PC), we should step over it. */
2598 debug_printf ("Hit a gdbserver breakpoint.\n");
2600 if (breakpoint_here (event_child
->stop_pc
))
2601 event_child
->need_step_over
= 1;
2606 /* We have some other signal, possibly a step-over dance was in
2607 progress, and it should be cancelled too. */
2608 step_over_finished
= finish_step_over (event_child
);
2611 /* We have all the data we need. Either report the event to GDB, or
2612 resume threads and keep waiting for more. */
2614 /* If we're collecting a fast tracepoint, finish the collection and
2615 move out of the jump pad before delivering a signal. See
2616 linux_stabilize_threads. */
2619 && WSTOPSIG (w
) != SIGTRAP
2620 && supports_fast_tracepoints ()
2621 && agent_loaded_p ())
2624 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2625 "to defer or adjust it.\n",
2626 WSTOPSIG (w
), lwpid_of (current_thread
));
2628 /* Allow debugging the jump pad itself. */
2629 if (current_thread
->last_resume_kind
!= resume_step
2630 && maybe_move_out_of_jump_pad (event_child
, &w
))
2632 enqueue_one_deferred_signal (event_child
, &w
);
2635 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2636 WSTOPSIG (w
), lwpid_of (current_thread
));
2638 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2640 return ignore_event (ourstatus
);
2644 if (event_child
->collecting_fast_tracepoint
)
2647 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2648 "Check if we're already there.\n",
2649 lwpid_of (current_thread
),
2650 event_child
->collecting_fast_tracepoint
);
2654 event_child
->collecting_fast_tracepoint
2655 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2657 if (event_child
->collecting_fast_tracepoint
!= 1)
2659 /* No longer need this breakpoint. */
2660 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2663 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2664 "stopping all threads momentarily.\n");
2666 /* Other running threads could hit this breakpoint.
2667 We don't handle moribund locations like GDB does,
2668 instead we always pause all threads when removing
2669 breakpoints, so that any step-over or
2670 decr_pc_after_break adjustment is always taken
2671 care of while the breakpoint is still
2673 stop_all_lwps (1, event_child
);
2675 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2676 event_child
->exit_jump_pad_bkpt
= NULL
;
2678 unstop_all_lwps (1, event_child
);
2680 gdb_assert (event_child
->suspended
>= 0);
2684 if (event_child
->collecting_fast_tracepoint
== 0)
2687 debug_printf ("fast tracepoint finished "
2688 "collecting successfully.\n");
2690 /* We may have a deferred signal to report. */
2691 if (dequeue_one_deferred_signal (event_child
, &w
))
2694 debug_printf ("dequeued one signal.\n");
2699 debug_printf ("no deferred signals.\n");
2701 if (stabilizing_threads
)
2703 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2704 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2708 debug_printf ("linux_wait_1 ret = %s, stopped "
2709 "while stabilizing threads\n",
2710 target_pid_to_str (ptid_of (current_thread
)));
2714 return ptid_of (current_thread
);
2720 /* Check whether GDB would be interested in this event. */
2722 /* If GDB is not interested in this signal, don't stop other
2723 threads, and don't report it to GDB. Just resume the inferior
2724 right away. We do this for threading-related signals as well as
2725 any that GDB specifically requested we ignore. But never ignore
2726 SIGSTOP if we sent it ourselves, and do not ignore signals when
2727 stepping - they may require special handling to skip the signal
2729 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2732 && current_thread
->last_resume_kind
!= resume_step
2734 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2735 (current_process ()->private->thread_db
!= NULL
2736 && (WSTOPSIG (w
) == __SIGRTMIN
2737 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2740 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2741 && !(WSTOPSIG (w
) == SIGSTOP
2742 && current_thread
->last_resume_kind
== resume_stop
))))
2744 siginfo_t info
, *info_p
;
2747 debug_printf ("Ignored signal %d for LWP %ld.\n",
2748 WSTOPSIG (w
), lwpid_of (current_thread
));
2750 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2751 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2755 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2756 WSTOPSIG (w
), info_p
);
2757 return ignore_event (ourstatus
);
2760 /* Note that all addresses are always "out of the step range" when
2761 there's no range to begin with. */
2762 in_step_range
= lwp_in_step_range (event_child
);
2764 /* If GDB wanted this thread to single step, and the thread is out
2765 of the step range, we always want to report the SIGTRAP, and let
2766 GDB handle it. Watchpoints should always be reported. So should
2767 signals we can't explain. A SIGTRAP we can't explain could be a
2768 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2769 do, we're be able to handle GDB breakpoints on top of internal
2770 breakpoints, by handling the internal breakpoint and still
2771 reporting the event to GDB. If we don't, we're out of luck, GDB
2772 won't see the breakpoint hit. */
2773 report_to_gdb
= (!maybe_internal_trap
2774 || (current_thread
->last_resume_kind
== resume_step
2776 || event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
2777 || (!step_over_finished
&& !in_step_range
2778 && !bp_explains_trap
&& !trace_event
)
2779 || (gdb_breakpoint_here (event_child
->stop_pc
)
2780 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2781 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2783 run_breakpoint_commands (event_child
->stop_pc
);
2785 /* We found no reason GDB would want us to stop. We either hit one
2786 of our own breakpoints, or finished an internal step GDB
2787 shouldn't know about. */
2792 if (bp_explains_trap
)
2793 debug_printf ("Hit a gdbserver breakpoint.\n");
2794 if (step_over_finished
)
2795 debug_printf ("Step-over finished.\n");
2797 debug_printf ("Tracepoint event.\n");
2798 if (lwp_in_step_range (event_child
))
2799 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2800 paddress (event_child
->stop_pc
),
2801 paddress (event_child
->step_range_start
),
2802 paddress (event_child
->step_range_end
));
2805 /* We're not reporting this breakpoint to GDB, so apply the
2806 decr_pc_after_break adjustment to the inferior's regcache
2809 if (the_low_target
.set_pc
!= NULL
)
2811 struct regcache
*regcache
2812 = get_thread_regcache (current_thread
, 1);
2813 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2816 /* We may have finished stepping over a breakpoint. If so,
2817 we've stopped and suspended all LWPs momentarily except the
2818 stepping one. This is where we resume them all again. We're
2819 going to keep waiting, so use proceed, which handles stepping
2820 over the next breakpoint. */
2822 debug_printf ("proceeding all threads.\n");
2824 if (step_over_finished
)
2825 unsuspend_all_lwps (event_child
);
2827 proceed_all_lwps ();
2828 return ignore_event (ourstatus
);
2833 if (current_thread
->last_resume_kind
== resume_step
)
2835 if (event_child
->step_range_start
== event_child
->step_range_end
)
2836 debug_printf ("GDB wanted to single-step, reporting event.\n");
2837 else if (!lwp_in_step_range (event_child
))
2838 debug_printf ("Out of step range, reporting event.\n");
2840 if (event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
)
2841 debug_printf ("Stopped by watchpoint.\n");
2842 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2843 debug_printf ("Stopped by GDB breakpoint.\n");
2845 debug_printf ("Hit a non-gdbserver trap event.\n");
2848 /* Alright, we're going to report a stop. */
2850 if (!stabilizing_threads
)
2852 /* In all-stop, stop all threads. */
2854 stop_all_lwps (0, NULL
);
2856 /* If we're not waiting for a specific LWP, choose an event LWP
2857 from among those that have had events. Giving equal priority
2858 to all LWPs that have had events helps prevent
2860 if (ptid_equal (ptid
, minus_one_ptid
))
2862 event_child
->status_pending_p
= 1;
2863 event_child
->status_pending
= w
;
2865 select_event_lwp (&event_child
);
2867 /* current_thread and event_child must stay in sync. */
2868 current_thread
= get_lwp_thread (event_child
);
2870 event_child
->status_pending_p
= 0;
2871 w
= event_child
->status_pending
;
2874 if (step_over_finished
)
2878 /* If we were doing a step-over, all other threads but
2879 the stepping one had been paused in start_step_over,
2880 with their suspend counts incremented. We don't want
2881 to do a full unstop/unpause, because we're in
2882 all-stop mode (so we want threads stopped), but we
2883 still need to unsuspend the other threads, to
2884 decrement their `suspended' count back. */
2885 unsuspend_all_lwps (event_child
);
2889 /* If we just finished a step-over, then all threads had
2890 been momentarily paused. In all-stop, that's fine,
2891 we want threads stopped by now anyway. In non-stop,
2892 we need to re-resume threads that GDB wanted to be
2894 unstop_all_lwps (1, event_child
);
2898 /* Stabilize threads (move out of jump pads). */
2900 stabilize_threads ();
2904 /* If we just finished a step-over, then all threads had been
2905 momentarily paused. In all-stop, that's fine, we want
2906 threads stopped by now anyway. In non-stop, we need to
2907 re-resume threads that GDB wanted to be running. */
2908 if (step_over_finished
)
2909 unstop_all_lwps (1, event_child
);
2912 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2914 /* Now that we've selected our final event LWP, un-adjust its PC if
2915 it was a software breakpoint. */
2916 if (event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2918 int decr_pc
= the_low_target
.decr_pc_after_break
;
2922 struct regcache
*regcache
2923 = get_thread_regcache (current_thread
, 1);
2924 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
2928 if (current_thread
->last_resume_kind
== resume_stop
2929 && WSTOPSIG (w
) == SIGSTOP
)
2931 /* A thread that has been requested to stop by GDB with vCont;t,
2932 and it stopped cleanly, so report as SIG0. The use of
2933 SIGSTOP is an implementation detail. */
2934 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2936 else if (current_thread
->last_resume_kind
== resume_stop
2937 && WSTOPSIG (w
) != SIGSTOP
)
2939 /* A thread that has been requested to stop by GDB with vCont;t,
2940 but, it stopped for other reasons. */
2941 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2945 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2948 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2952 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2953 target_pid_to_str (ptid_of (current_thread
)),
2954 ourstatus
->kind
, ourstatus
->value
.sig
);
2958 return ptid_of (current_thread
);
2961 /* Get rid of any pending event in the pipe. */
2963 async_file_flush (void)
2969 ret
= read (linux_event_pipe
[0], &buf
, 1);
2970 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2973 /* Put something in the pipe, so the event loop wakes up. */
2975 async_file_mark (void)
2979 async_file_flush ();
2982 ret
= write (linux_event_pipe
[1], "+", 1);
2983 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2985 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2986 be awakened anyway. */
2990 linux_wait (ptid_t ptid
,
2991 struct target_waitstatus
*ourstatus
, int target_options
)
2995 /* Flush the async file first. */
2996 if (target_is_async_p ())
2997 async_file_flush ();
3001 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3003 while ((target_options
& TARGET_WNOHANG
) == 0
3004 && ptid_equal (event_ptid
, null_ptid
)
3005 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3007 /* If at least one stop was reported, there may be more. A single
3008 SIGCHLD can signal more than one child stop. */
3009 if (target_is_async_p ()
3010 && (target_options
& TARGET_WNOHANG
) != 0
3011 && !ptid_equal (event_ptid
, null_ptid
))
3017 /* Send a signal to an LWP. */
3020 kill_lwp (unsigned long lwpid
, int signo
)
3022 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3023 fails, then we are not using nptl threads and we should be using kill. */
3027 static int tkill_failed
;
3034 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3035 if (errno
!= ENOSYS
)
3042 return kill (lwpid
, signo
);
3046 linux_stop_lwp (struct lwp_info
*lwp
)
3052 send_sigstop (struct lwp_info
*lwp
)
3056 pid
= lwpid_of (get_lwp_thread (lwp
));
3058 /* If we already have a pending stop signal for this process, don't
3060 if (lwp
->stop_expected
)
3063 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3069 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3071 lwp
->stop_expected
= 1;
3072 kill_lwp (pid
, SIGSTOP
);
3076 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3078 struct thread_info
*thread
= (struct thread_info
*) entry
;
3079 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3081 /* Ignore EXCEPT. */
3092 /* Increment the suspend count of an LWP, and stop it, if not stopped
3095 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3098 struct thread_info
*thread
= (struct thread_info
*) entry
;
3099 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3101 /* Ignore EXCEPT. */
3107 return send_sigstop_callback (entry
, except
);
3111 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3113 /* It's dead, really. */
3116 /* Store the exit status for later. */
3117 lwp
->status_pending_p
= 1;
3118 lwp
->status_pending
= wstat
;
3120 /* Prevent trying to stop it. */
3123 /* No further stops are expected from a dead lwp. */
3124 lwp
->stop_expected
= 0;
3127 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3130 wait_for_sigstop (void)
3132 struct thread_info
*saved_thread
;
3137 saved_thread
= current_thread
;
3138 if (saved_thread
!= NULL
)
3139 saved_tid
= saved_thread
->entry
.id
;
3141 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3144 debug_printf ("wait_for_sigstop: pulling events\n");
3146 /* Passing NULL_PTID as filter indicates we want all events to be
3147 left pending. Eventually this returns when there are no
3148 unwaited-for children left. */
3149 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3151 gdb_assert (ret
== -1);
3153 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3154 current_thread
= saved_thread
;
3158 debug_printf ("Previously current thread died.\n");
3162 /* We can't change the current inferior behind GDB's back,
3163 otherwise, a subsequent command may apply to the wrong
3165 current_thread
= NULL
;
3169 /* Set a valid thread as current. */
3170 set_desired_thread (0);
3175 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3176 move it out, because we need to report the stop event to GDB. For
3177 example, if the user puts a breakpoint in the jump pad, it's
3178 because she wants to debug it. */
3181 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3183 struct thread_info
*thread
= (struct thread_info
*) entry
;
3184 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3186 gdb_assert (lwp
->suspended
== 0);
3187 gdb_assert (lwp
->stopped
);
3189 /* Allow debugging the jump pad, gdb_collect, etc.. */
3190 return (supports_fast_tracepoints ()
3191 && agent_loaded_p ()
3192 && (gdb_breakpoint_here (lwp
->stop_pc
)
3193 || lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
3194 || thread
->last_resume_kind
== resume_step
)
3195 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3199 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3201 struct thread_info
*thread
= (struct thread_info
*) entry
;
3202 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3205 gdb_assert (lwp
->suspended
== 0);
3206 gdb_assert (lwp
->stopped
);
3208 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3210 /* Allow debugging the jump pad, gdb_collect, etc. */
3211 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3212 && lwp
->stop_reason
!= LWP_STOPPED_BY_WATCHPOINT
3213 && thread
->last_resume_kind
!= resume_step
3214 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3217 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3222 lwp
->status_pending_p
= 0;
3223 enqueue_one_deferred_signal (lwp
, wstat
);
3226 debug_printf ("Signal %d for LWP %ld deferred "
3228 WSTOPSIG (*wstat
), lwpid_of (thread
));
3231 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3238 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3240 struct thread_info
*thread
= (struct thread_info
*) entry
;
3241 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3250 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3251 If SUSPEND, then also increase the suspend count of every LWP,
3255 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3257 /* Should not be called recursively. */
3258 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3263 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3264 suspend
? "stop-and-suspend" : "stop",
3266 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3270 stopping_threads
= (suspend
3271 ? STOPPING_AND_SUSPENDING_THREADS
3272 : STOPPING_THREADS
);
3275 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3277 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3278 wait_for_sigstop ();
3279 stopping_threads
= NOT_STOPPING_THREADS
;
3283 debug_printf ("stop_all_lwps done, setting stopping_threads "
3284 "back to !stopping\n");
3289 /* Resume execution of the inferior process.
3290 If STEP is nonzero, single-step it.
3291 If SIGNAL is nonzero, give it that signal. */
3294 linux_resume_one_lwp (struct lwp_info
*lwp
,
3295 int step
, int signal
, siginfo_t
*info
)
3297 struct thread_info
*thread
= get_lwp_thread (lwp
);
3298 struct thread_info
*saved_thread
;
3299 int fast_tp_collecting
;
3301 if (lwp
->stopped
== 0)
3304 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3306 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3308 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3309 user used the "jump" command, or "set $pc = foo"). */
3310 if (lwp
->stop_pc
!= get_pc (lwp
))
3312 /* Collecting 'while-stepping' actions doesn't make sense
3314 release_while_stepping_state_list (thread
);
3317 /* If we have pending signals or status, and a new signal, enqueue the
3318 signal. Also enqueue the signal if we are waiting to reinsert a
3319 breakpoint; it will be picked up again below. */
3321 && (lwp
->status_pending_p
3322 || lwp
->pending_signals
!= NULL
3323 || lwp
->bp_reinsert
!= 0
3324 || fast_tp_collecting
))
3326 struct pending_signals
*p_sig
;
3327 p_sig
= xmalloc (sizeof (*p_sig
));
3328 p_sig
->prev
= lwp
->pending_signals
;
3329 p_sig
->signal
= signal
;
3331 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3333 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3334 lwp
->pending_signals
= p_sig
;
3337 if (lwp
->status_pending_p
)
3340 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3341 " has pending status\n",
3342 lwpid_of (thread
), step
? "step" : "continue", signal
,
3343 lwp
->stop_expected
? "expected" : "not expected");
3347 saved_thread
= current_thread
;
3348 current_thread
= thread
;
3351 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3352 lwpid_of (thread
), step
? "step" : "continue", signal
,
3353 lwp
->stop_expected
? "expected" : "not expected");
3355 /* This bit needs some thinking about. If we get a signal that
3356 we must report while a single-step reinsert is still pending,
3357 we often end up resuming the thread. It might be better to
3358 (ew) allow a stack of pending events; then we could be sure that
3359 the reinsert happened right away and not lose any signals.
3361 Making this stack would also shrink the window in which breakpoints are
3362 uninserted (see comment in linux_wait_for_lwp) but not enough for
3363 complete correctness, so it won't solve that problem. It may be
3364 worthwhile just to solve this one, however. */
3365 if (lwp
->bp_reinsert
!= 0)
3368 debug_printf (" pending reinsert at 0x%s\n",
3369 paddress (lwp
->bp_reinsert
));
3371 if (can_hardware_single_step ())
3373 if (fast_tp_collecting
== 0)
3376 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3378 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3385 /* Postpone any pending signal. It was enqueued above. */
3389 if (fast_tp_collecting
== 1)
3392 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3393 " (exit-jump-pad-bkpt)\n",
3396 /* Postpone any pending signal. It was enqueued above. */
3399 else if (fast_tp_collecting
== 2)
3402 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3403 " single-stepping\n",
3406 if (can_hardware_single_step ())
3410 internal_error (__FILE__
, __LINE__
,
3411 "moving out of jump pad single-stepping"
3412 " not implemented on this target");
3415 /* Postpone any pending signal. It was enqueued above. */
3419 /* If we have while-stepping actions in this thread set it stepping.
3420 If we have a signal to deliver, it may or may not be set to
3421 SIG_IGN, we don't know. Assume so, and allow collecting
3422 while-stepping into a signal handler. A possible smart thing to
3423 do would be to set an internal breakpoint at the signal return
3424 address, continue, and carry on catching this while-stepping
3425 action only when that breakpoint is hit. A future
3427 if (thread
->while_stepping
!= NULL
3428 && can_hardware_single_step ())
3431 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3436 if (the_low_target
.get_pc
!= NULL
)
3438 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3440 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3444 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3445 (long) lwp
->stop_pc
);
3449 /* If we have pending signals, consume one unless we are trying to
3450 reinsert a breakpoint or we're trying to finish a fast tracepoint
3452 if (lwp
->pending_signals
!= NULL
3453 && lwp
->bp_reinsert
== 0
3454 && fast_tp_collecting
== 0)
3456 struct pending_signals
**p_sig
;
3458 p_sig
= &lwp
->pending_signals
;
3459 while ((*p_sig
)->prev
!= NULL
)
3460 p_sig
= &(*p_sig
)->prev
;
3462 signal
= (*p_sig
)->signal
;
3463 if ((*p_sig
)->info
.si_signo
!= 0)
3464 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3471 if (the_low_target
.prepare_to_resume
!= NULL
)
3472 the_low_target
.prepare_to_resume (lwp
);
3474 regcache_invalidate_thread (thread
);
3477 lwp
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
3478 lwp
->stepping
= step
;
3479 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3480 (PTRACE_TYPE_ARG3
) 0,
3481 /* Coerce to a uintptr_t first to avoid potential gcc warning
3482 of coercing an 8 byte integer to a 4 byte pointer. */
3483 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3485 current_thread
= saved_thread
;
3488 /* ESRCH from ptrace either means that the thread was already
3489 running (an error) or that it is gone (a race condition). If
3490 it's gone, we will get a notification the next time we wait,
3491 so we can ignore the error. We could differentiate these
3492 two, but it's tricky without waiting; the thread still exists
3493 as a zombie, so sending it signal 0 would succeed. So just
3498 perror_with_name ("ptrace");
3502 struct thread_resume_array
3504 struct thread_resume
*resume
;
3508 /* This function is called once per thread via find_inferior.
3509 ARG is a pointer to a thread_resume_array struct.
3510 We look up the thread specified by ENTRY in ARG, and mark the thread
3511 with a pointer to the appropriate resume request.
3513 This algorithm is O(threads * resume elements), but resume elements
3514 is small (and will remain small at least until GDB supports thread
3518 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3520 struct thread_info
*thread
= (struct thread_info
*) entry
;
3521 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3523 struct thread_resume_array
*r
;
3527 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3529 ptid_t ptid
= r
->resume
[ndx
].thread
;
3530 if (ptid_equal (ptid
, minus_one_ptid
)
3531 || ptid_equal (ptid
, entry
->id
)
3532 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3534 || (ptid_get_pid (ptid
) == pid_of (thread
)
3535 && (ptid_is_pid (ptid
)
3536 || ptid_get_lwp (ptid
) == -1)))
3538 if (r
->resume
[ndx
].kind
== resume_stop
3539 && thread
->last_resume_kind
== resume_stop
)
3542 debug_printf ("already %s LWP %ld at GDB's request\n",
3543 (thread
->last_status
.kind
3544 == TARGET_WAITKIND_STOPPED
)
3552 lwp
->resume
= &r
->resume
[ndx
];
3553 thread
->last_resume_kind
= lwp
->resume
->kind
;
3555 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3556 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3558 /* If we had a deferred signal to report, dequeue one now.
3559 This can happen if LWP gets more than one signal while
3560 trying to get out of a jump pad. */
3562 && !lwp
->status_pending_p
3563 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3565 lwp
->status_pending_p
= 1;
3568 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3569 "leaving status pending.\n",
3570 WSTOPSIG (lwp
->status_pending
),
3578 /* No resume action for this thread. */
3584 /* find_inferior callback for linux_resume.
3585 Set *FLAG_P if this lwp has an interesting status pending. */
3588 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3590 struct thread_info
*thread
= (struct thread_info
*) entry
;
3591 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3593 /* LWPs which will not be resumed are not interesting, because
3594 we might not wait for them next time through linux_wait. */
3595 if (lwp
->resume
== NULL
)
3598 if (thread_still_has_status_pending_p (thread
))
3599 * (int *) flag_p
= 1;
3604 /* Return 1 if this lwp that GDB wants running is stopped at an
3605 internal breakpoint that we need to step over. It assumes that any
3606 required STOP_PC adjustment has already been propagated to the
3607 inferior's regcache. */
3610 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3612 struct thread_info
*thread
= (struct thread_info
*) entry
;
3613 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3614 struct thread_info
*saved_thread
;
3617 /* LWPs which will not be resumed are not interesting, because we
3618 might not wait for them next time through linux_wait. */
3623 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3628 if (thread
->last_resume_kind
== resume_stop
)
3631 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3637 gdb_assert (lwp
->suspended
>= 0);
3642 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3647 if (!lwp
->need_step_over
)
3650 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3653 if (lwp
->status_pending_p
)
3656 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3662 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3666 /* If the PC has changed since we stopped, then don't do anything,
3667 and let the breakpoint/tracepoint be hit. This happens if, for
3668 instance, GDB handled the decr_pc_after_break subtraction itself,
3669 GDB is OOL stepping this thread, or the user has issued a "jump"
3670 command, or poked thread's registers herself. */
3671 if (pc
!= lwp
->stop_pc
)
3674 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3675 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3677 paddress (lwp
->stop_pc
), paddress (pc
));
3679 lwp
->need_step_over
= 0;
3683 saved_thread
= current_thread
;
3684 current_thread
= thread
;
3686 /* We can only step over breakpoints we know about. */
3687 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3689 /* Don't step over a breakpoint that GDB expects to hit
3690 though. If the condition is being evaluated on the target's side
3691 and it evaluate to false, step over this breakpoint as well. */
3692 if (gdb_breakpoint_here (pc
)
3693 && gdb_condition_true_at_breakpoint (pc
)
3694 && gdb_no_commands_at_breakpoint (pc
))
3697 debug_printf ("Need step over [LWP %ld]? yes, but found"
3698 " GDB breakpoint at 0x%s; skipping step over\n",
3699 lwpid_of (thread
), paddress (pc
));
3701 current_thread
= saved_thread
;
3707 debug_printf ("Need step over [LWP %ld]? yes, "
3708 "found breakpoint at 0x%s\n",
3709 lwpid_of (thread
), paddress (pc
));
3711 /* We've found an lwp that needs stepping over --- return 1 so
3712 that find_inferior stops looking. */
3713 current_thread
= saved_thread
;
3715 /* If the step over is cancelled, this is set again. */
3716 lwp
->need_step_over
= 0;
3721 current_thread
= saved_thread
;
3724 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3726 lwpid_of (thread
), paddress (pc
));
3731 /* Start a step-over operation on LWP. When LWP stopped at a
3732 breakpoint, to make progress, we need to remove the breakpoint out
3733 of the way. If we let other threads run while we do that, they may
3734 pass by the breakpoint location and miss hitting it. To avoid
3735 that, a step-over momentarily stops all threads while LWP is
3736 single-stepped while the breakpoint is temporarily uninserted from
3737 the inferior. When the single-step finishes, we reinsert the
3738 breakpoint, and let all threads that are supposed to be running,
3741 On targets that don't support hardware single-step, we don't
3742 currently support full software single-stepping. Instead, we only
3743 support stepping over the thread event breakpoint, by asking the
3744 low target where to place a reinsert breakpoint. Since this
3745 routine assumes the breakpoint being stepped over is a thread event
3746 breakpoint, it usually assumes the return address of the current
3747 function is a good enough place to set the reinsert breakpoint. */
3750 start_step_over (struct lwp_info
*lwp
)
3752 struct thread_info
*thread
= get_lwp_thread (lwp
);
3753 struct thread_info
*saved_thread
;
3758 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3761 stop_all_lwps (1, lwp
);
3762 gdb_assert (lwp
->suspended
== 0);
3765 debug_printf ("Done stopping all threads for step-over.\n");
3767 /* Note, we should always reach here with an already adjusted PC,
3768 either by GDB (if we're resuming due to GDB's request), or by our
3769 caller, if we just finished handling an internal breakpoint GDB
3770 shouldn't care about. */
3773 saved_thread
= current_thread
;
3774 current_thread
= thread
;
3776 lwp
->bp_reinsert
= pc
;
3777 uninsert_breakpoints_at (pc
);
3778 uninsert_fast_tracepoint_jumps_at (pc
);
3780 if (can_hardware_single_step ())
3786 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3787 set_reinsert_breakpoint (raddr
);
3791 current_thread
= saved_thread
;
3793 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3795 /* Require next event from this LWP. */
3796 step_over_bkpt
= thread
->entry
.id
;
3800 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3801 start_step_over, if still there, and delete any reinsert
3802 breakpoints we've set, on non hardware single-step targets. */
3805 finish_step_over (struct lwp_info
*lwp
)
3807 if (lwp
->bp_reinsert
!= 0)
3810 debug_printf ("Finished step over.\n");
3812 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3813 may be no breakpoint to reinsert there by now. */
3814 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3815 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3817 lwp
->bp_reinsert
= 0;
3819 /* Delete any software-single-step reinsert breakpoints. No
3820 longer needed. We don't have to worry about other threads
3821 hitting this trap, and later not being able to explain it,
3822 because we were stepping over a breakpoint, and we hold all
3823 threads but LWP stopped while doing that. */
3824 if (!can_hardware_single_step ())
3825 delete_reinsert_breakpoints ();
3827 step_over_bkpt
= null_ptid
;
3834 /* This function is called once per thread. We check the thread's resume
3835 request, which will tell us whether to resume, step, or leave the thread
3836 stopped; and what signal, if any, it should be sent.
3838 For threads which we aren't explicitly told otherwise, we preserve
3839 the stepping flag; this is used for stepping over gdbserver-placed
3842 If pending_flags was set in any thread, we queue any needed
3843 signals, since we won't actually resume. We already have a pending
3844 event to report, so we don't need to preserve any step requests;
3845 they should be re-issued if necessary. */
3848 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3850 struct thread_info
*thread
= (struct thread_info
*) entry
;
3851 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3853 int leave_all_stopped
= * (int *) arg
;
3856 if (lwp
->resume
== NULL
)
3859 if (lwp
->resume
->kind
== resume_stop
)
3862 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3867 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3869 /* Stop the thread, and wait for the event asynchronously,
3870 through the event loop. */
3876 debug_printf ("already stopped LWP %ld\n",
3879 /* The LWP may have been stopped in an internal event that
3880 was not meant to be notified back to GDB (e.g., gdbserver
3881 breakpoint), so we should be reporting a stop event in
3884 /* If the thread already has a pending SIGSTOP, this is a
3885 no-op. Otherwise, something later will presumably resume
3886 the thread and this will cause it to cancel any pending
3887 operation, due to last_resume_kind == resume_stop. If
3888 the thread already has a pending status to report, we
3889 will still report it the next time we wait - see
3890 status_pending_p_callback. */
3892 /* If we already have a pending signal to report, then
3893 there's no need to queue a SIGSTOP, as this means we're
3894 midway through moving the LWP out of the jumppad, and we
3895 will report the pending signal as soon as that is
3897 if (lwp
->pending_signals_to_report
== NULL
)
3901 /* For stop requests, we're done. */
3903 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3907 /* If this thread which is about to be resumed has a pending status,
3908 then don't resume any threads - we can just report the pending
3909 status. Make sure to queue any signals that would otherwise be
3910 sent. In all-stop mode, we do this decision based on if *any*
3911 thread has a pending status. If there's a thread that needs the
3912 step-over-breakpoint dance, then don't resume any other thread
3913 but that particular one. */
3914 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3919 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3921 step
= (lwp
->resume
->kind
== resume_step
);
3922 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3927 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3929 /* If we have a new signal, enqueue the signal. */
3930 if (lwp
->resume
->sig
!= 0)
3932 struct pending_signals
*p_sig
;
3933 p_sig
= xmalloc (sizeof (*p_sig
));
3934 p_sig
->prev
= lwp
->pending_signals
;
3935 p_sig
->signal
= lwp
->resume
->sig
;
3936 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3938 /* If this is the same signal we were previously stopped by,
3939 make sure to queue its siginfo. We can ignore the return
3940 value of ptrace; if it fails, we'll skip
3941 PTRACE_SETSIGINFO. */
3942 if (WIFSTOPPED (lwp
->last_status
)
3943 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3944 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3947 lwp
->pending_signals
= p_sig
;
3951 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3957 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3959 struct thread_resume_array array
= { resume_info
, n
};
3960 struct thread_info
*need_step_over
= NULL
;
3962 int leave_all_stopped
;
3967 debug_printf ("linux_resume:\n");
3970 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3972 /* If there is a thread which would otherwise be resumed, which has
3973 a pending status, then don't resume any threads - we can just
3974 report the pending status. Make sure to queue any signals that
3975 would otherwise be sent. In non-stop mode, we'll apply this
3976 logic to each thread individually. We consume all pending events
3977 before considering to start a step-over (in all-stop). */
3980 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3982 /* If there is a thread which would otherwise be resumed, which is
3983 stopped at a breakpoint that needs stepping over, then don't
3984 resume any threads - have it step over the breakpoint with all
3985 other threads stopped, then resume all threads again. Make sure
3986 to queue any signals that would otherwise be delivered or
3988 if (!any_pending
&& supports_breakpoints ())
3990 = (struct thread_info
*) find_inferior (&all_threads
,
3991 need_step_over_p
, NULL
);
3993 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3997 if (need_step_over
!= NULL
)
3998 debug_printf ("Not resuming all, need step over\n");
3999 else if (any_pending
)
4000 debug_printf ("Not resuming, all-stop and found "
4001 "an LWP with pending status\n");
4003 debug_printf ("Resuming, no pending status or step over needed\n");
4006 /* Even if we're leaving threads stopped, queue all signals we'd
4007 otherwise deliver. */
4008 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4011 start_step_over (get_thread_lwp (need_step_over
));
4015 debug_printf ("linux_resume done\n");
4020 /* This function is called once per thread. We check the thread's
4021 last resume request, which will tell us whether to resume, step, or
4022 leave the thread stopped. Any signal the client requested to be
4023 delivered has already been enqueued at this point.
4025 If any thread that GDB wants running is stopped at an internal
4026 breakpoint that needs stepping over, we start a step-over operation
4027 on that particular thread, and leave all others stopped. */
4030 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4032 struct thread_info
*thread
= (struct thread_info
*) entry
;
4033 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4040 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4045 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4049 if (thread
->last_resume_kind
== resume_stop
4050 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4053 debug_printf (" client wants LWP to remain %ld stopped\n",
4058 if (lwp
->status_pending_p
)
4061 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4066 gdb_assert (lwp
->suspended
>= 0);
4071 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4075 if (thread
->last_resume_kind
== resume_stop
4076 && lwp
->pending_signals_to_report
== NULL
4077 && lwp
->collecting_fast_tracepoint
== 0)
4079 /* We haven't reported this LWP as stopped yet (otherwise, the
4080 last_status.kind check above would catch it, and we wouldn't
4081 reach here. This LWP may have been momentarily paused by a
4082 stop_all_lwps call while handling for example, another LWP's
4083 step-over. In that case, the pending expected SIGSTOP signal
4084 that was queued at vCont;t handling time will have already
4085 been consumed by wait_for_sigstop, and so we need to requeue
4086 another one here. Note that if the LWP already has a SIGSTOP
4087 pending, this is a no-op. */
4090 debug_printf ("Client wants LWP %ld to stop. "
4091 "Making sure it has a SIGSTOP pending\n",
4097 step
= thread
->last_resume_kind
== resume_step
;
4098 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4103 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4105 struct thread_info
*thread
= (struct thread_info
*) entry
;
4106 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4112 gdb_assert (lwp
->suspended
>= 0);
4114 return proceed_one_lwp (entry
, except
);
4117 /* When we finish a step-over, set threads running again. If there's
4118 another thread that may need a step-over, now's the time to start
4119 it. Eventually, we'll move all threads past their breakpoints. */
4122 proceed_all_lwps (void)
4124 struct thread_info
*need_step_over
;
4126 /* If there is a thread which would otherwise be resumed, which is
4127 stopped at a breakpoint that needs stepping over, then don't
4128 resume any threads - have it step over the breakpoint with all
4129 other threads stopped, then resume all threads again. */
4131 if (supports_breakpoints ())
4134 = (struct thread_info
*) find_inferior (&all_threads
,
4135 need_step_over_p
, NULL
);
4137 if (need_step_over
!= NULL
)
4140 debug_printf ("proceed_all_lwps: found "
4141 "thread %ld needing a step-over\n",
4142 lwpid_of (need_step_over
));
4144 start_step_over (get_thread_lwp (need_step_over
));
4150 debug_printf ("Proceeding, no step-over needed\n");
4152 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4155 /* Stopped LWPs that the client wanted to be running, that don't have
4156 pending statuses, are set to run again, except for EXCEPT, if not
4157 NULL. This undoes a stop_all_lwps call. */
4160 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4166 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4167 lwpid_of (get_lwp_thread (except
)));
4169 debug_printf ("unstopping all lwps\n");
4173 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4175 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4179 debug_printf ("unstop_all_lwps done\n");
4185 #ifdef HAVE_LINUX_REGSETS
4187 #define use_linux_regsets 1
4189 /* Returns true if REGSET has been disabled. */
4192 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4194 return (info
->disabled_regsets
!= NULL
4195 && info
->disabled_regsets
[regset
- info
->regsets
]);
4198 /* Disable REGSET. */
4201 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4205 dr_offset
= regset
- info
->regsets
;
4206 if (info
->disabled_regsets
== NULL
)
4207 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4208 info
->disabled_regsets
[dr_offset
] = 1;
4212 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4213 struct regcache
*regcache
)
4215 struct regset_info
*regset
;
4216 int saw_general_regs
= 0;
4220 pid
= lwpid_of (current_thread
);
4221 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4226 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4229 buf
= xmalloc (regset
->size
);
4231 nt_type
= regset
->nt_type
;
4235 iov
.iov_len
= regset
->size
;
4236 data
= (void *) &iov
;
4242 res
= ptrace (regset
->get_request
, pid
,
4243 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4245 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4251 /* If we get EIO on a regset, do not try it again for
4252 this process mode. */
4253 disable_regset (regsets_info
, regset
);
4255 else if (errno
== ENODATA
)
4257 /* ENODATA may be returned if the regset is currently
4258 not "active". This can happen in normal operation,
4259 so suppress the warning in this case. */
4264 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4271 if (regset
->type
== GENERAL_REGS
)
4272 saw_general_regs
= 1;
4273 regset
->store_function (regcache
, buf
);
4277 if (saw_general_regs
)
4284 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4285 struct regcache
*regcache
)
4287 struct regset_info
*regset
;
4288 int saw_general_regs
= 0;
4292 pid
= lwpid_of (current_thread
);
4293 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4298 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4299 || regset
->fill_function
== NULL
)
4302 buf
= xmalloc (regset
->size
);
4304 /* First fill the buffer with the current register set contents,
4305 in case there are any items in the kernel's regset that are
4306 not in gdbserver's regcache. */
4308 nt_type
= regset
->nt_type
;
4312 iov
.iov_len
= regset
->size
;
4313 data
= (void *) &iov
;
4319 res
= ptrace (regset
->get_request
, pid
,
4320 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4322 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4327 /* Then overlay our cached registers on that. */
4328 regset
->fill_function (regcache
, buf
);
4330 /* Only now do we write the register set. */
4332 res
= ptrace (regset
->set_request
, pid
,
4333 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4335 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4343 /* If we get EIO on a regset, do not try it again for
4344 this process mode. */
4345 disable_regset (regsets_info
, regset
);
4347 else if (errno
== ESRCH
)
4349 /* At this point, ESRCH should mean the process is
4350 already gone, in which case we simply ignore attempts
4351 to change its registers. See also the related
4352 comment in linux_resume_one_lwp. */
4358 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4361 else if (regset
->type
== GENERAL_REGS
)
4362 saw_general_regs
= 1;
4365 if (saw_general_regs
)
4371 #else /* !HAVE_LINUX_REGSETS */
4373 #define use_linux_regsets 0
4374 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4375 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4379 /* Return 1 if register REGNO is supported by one of the regset ptrace
4380 calls or 0 if it has to be transferred individually. */
4383 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4385 unsigned char mask
= 1 << (regno
% 8);
4386 size_t index
= regno
/ 8;
4388 return (use_linux_regsets
4389 && (regs_info
->regset_bitmap
== NULL
4390 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4393 #ifdef HAVE_LINUX_USRREGS
4396 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4400 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4401 error ("Invalid register number %d.", regnum
);
4403 addr
= usrregs
->regmap
[regnum
];
4408 /* Fetch one register. */
4410 fetch_register (const struct usrregs_info
*usrregs
,
4411 struct regcache
*regcache
, int regno
)
4418 if (regno
>= usrregs
->num_regs
)
4420 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4423 regaddr
= register_addr (usrregs
, regno
);
4427 size
= ((register_size (regcache
->tdesc
, regno
)
4428 + sizeof (PTRACE_XFER_TYPE
) - 1)
4429 & -sizeof (PTRACE_XFER_TYPE
));
4430 buf
= alloca (size
);
4432 pid
= lwpid_of (current_thread
);
4433 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4436 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4437 ptrace (PTRACE_PEEKUSER
, pid
,
4438 /* Coerce to a uintptr_t first to avoid potential gcc warning
4439 of coercing an 8 byte integer to a 4 byte pointer. */
4440 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4441 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4443 error ("reading register %d: %s", regno
, strerror (errno
));
4446 if (the_low_target
.supply_ptrace_register
)
4447 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4449 supply_register (regcache
, regno
, buf
);
4452 /* Store one register. */
4454 store_register (const struct usrregs_info
*usrregs
,
4455 struct regcache
*regcache
, int regno
)
4462 if (regno
>= usrregs
->num_regs
)
4464 if ((*the_low_target
.cannot_store_register
) (regno
))
4467 regaddr
= register_addr (usrregs
, regno
);
4471 size
= ((register_size (regcache
->tdesc
, regno
)
4472 + sizeof (PTRACE_XFER_TYPE
) - 1)
4473 & -sizeof (PTRACE_XFER_TYPE
));
4474 buf
= alloca (size
);
4475 memset (buf
, 0, size
);
4477 if (the_low_target
.collect_ptrace_register
)
4478 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4480 collect_register (regcache
, regno
, buf
);
4482 pid
= lwpid_of (current_thread
);
4483 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4486 ptrace (PTRACE_POKEUSER
, pid
,
4487 /* Coerce to a uintptr_t first to avoid potential gcc warning
4488 about coercing an 8 byte integer to a 4 byte pointer. */
4489 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4490 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4493 /* At this point, ESRCH should mean the process is
4494 already gone, in which case we simply ignore attempts
4495 to change its registers. See also the related
4496 comment in linux_resume_one_lwp. */
4500 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4501 error ("writing register %d: %s", regno
, strerror (errno
));
4503 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4507 /* Fetch all registers, or just one, from the child process.
4508 If REGNO is -1, do this for all registers, skipping any that are
4509 assumed to have been retrieved by regsets_fetch_inferior_registers,
4510 unless ALL is non-zero.
4511 Otherwise, REGNO specifies which register (so we can save time). */
4513 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4514 struct regcache
*regcache
, int regno
, int all
)
4516 struct usrregs_info
*usr
= regs_info
->usrregs
;
4520 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4521 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4522 fetch_register (usr
, regcache
, regno
);
4525 fetch_register (usr
, regcache
, regno
);
4528 /* Store our register values back into the inferior.
4529 If REGNO is -1, do this for all registers, skipping any that are
4530 assumed to have been saved by regsets_store_inferior_registers,
4531 unless ALL is non-zero.
4532 Otherwise, REGNO specifies which register (so we can save time). */
4534 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4535 struct regcache
*regcache
, int regno
, int all
)
4537 struct usrregs_info
*usr
= regs_info
->usrregs
;
4541 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4542 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4543 store_register (usr
, regcache
, regno
);
4546 store_register (usr
, regcache
, regno
);
4549 #else /* !HAVE_LINUX_USRREGS */
4551 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4552 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4558 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4562 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4566 if (the_low_target
.fetch_register
!= NULL
4567 && regs_info
->usrregs
!= NULL
)
4568 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4569 (*the_low_target
.fetch_register
) (regcache
, regno
);
4571 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4572 if (regs_info
->usrregs
!= NULL
)
4573 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4577 if (the_low_target
.fetch_register
!= NULL
4578 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4581 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4583 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4585 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4586 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4591 linux_store_registers (struct regcache
*regcache
, int regno
)
4595 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4599 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4601 if (regs_info
->usrregs
!= NULL
)
4602 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4606 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4608 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4610 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4611 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4616 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4617 to debugger memory starting at MYADDR. */
4620 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4622 int pid
= lwpid_of (current_thread
);
4623 register PTRACE_XFER_TYPE
*buffer
;
4624 register CORE_ADDR addr
;
4631 /* Try using /proc. Don't bother for one word. */
4632 if (len
>= 3 * sizeof (long))
4636 /* We could keep this file open and cache it - possibly one per
4637 thread. That requires some juggling, but is even faster. */
4638 sprintf (filename
, "/proc/%d/mem", pid
);
4639 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4643 /* If pread64 is available, use it. It's faster if the kernel
4644 supports it (only one syscall), and it's 64-bit safe even on
4645 32-bit platforms (for instance, SPARC debugging a SPARC64
4648 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4651 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4652 bytes
= read (fd
, myaddr
, len
);
4659 /* Some data was read, we'll try to get the rest with ptrace. */
4669 /* Round starting address down to longword boundary. */
4670 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4671 /* Round ending address up; get number of longwords that makes. */
4672 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4673 / sizeof (PTRACE_XFER_TYPE
));
4674 /* Allocate buffer of that many longwords. */
4675 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4677 /* Read all the longwords */
4679 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4681 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4682 about coercing an 8 byte integer to a 4 byte pointer. */
4683 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4684 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4685 (PTRACE_TYPE_ARG4
) 0);
4691 /* Copy appropriate bytes out of the buffer. */
4694 i
*= sizeof (PTRACE_XFER_TYPE
);
4695 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4697 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4704 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4705 memory at MEMADDR. On failure (cannot write to the inferior)
4706 returns the value of errno. Always succeeds if LEN is zero. */
4709 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4712 /* Round starting address down to longword boundary. */
4713 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4714 /* Round ending address up; get number of longwords that makes. */
4716 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4717 / sizeof (PTRACE_XFER_TYPE
);
4719 /* Allocate buffer of that many longwords. */
4720 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4721 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4723 int pid
= lwpid_of (current_thread
);
4727 /* Zero length write always succeeds. */
4733 /* Dump up to four bytes. */
4734 unsigned int val
= * (unsigned int *) myaddr
;
4740 val
= val
& 0xffffff;
4741 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4742 val
, (long)memaddr
);
4745 /* Fill start and end extra bytes of buffer with existing memory data. */
4748 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4749 about coercing an 8 byte integer to a 4 byte pointer. */
4750 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4751 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4752 (PTRACE_TYPE_ARG4
) 0);
4760 = ptrace (PTRACE_PEEKTEXT
, pid
,
4761 /* Coerce to a uintptr_t first to avoid potential gcc warning
4762 about coercing an 8 byte integer to a 4 byte pointer. */
4763 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4764 * sizeof (PTRACE_XFER_TYPE
)),
4765 (PTRACE_TYPE_ARG4
) 0);
4770 /* Copy data to be written over corresponding part of buffer. */
4772 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4775 /* Write the entire buffer. */
4777 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4780 ptrace (PTRACE_POKETEXT
, pid
,
4781 /* Coerce to a uintptr_t first to avoid potential gcc warning
4782 about coercing an 8 byte integer to a 4 byte pointer. */
4783 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4784 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4793 linux_look_up_symbols (void)
4795 #ifdef USE_THREAD_DB
4796 struct process_info
*proc
= current_process ();
4798 if (proc
->private->thread_db
!= NULL
)
4801 /* If the kernel supports tracing clones, then we don't need to
4802 use the magic thread event breakpoint to learn about
4804 thread_db_init (!linux_supports_traceclone ());
4809 linux_request_interrupt (void)
4811 extern unsigned long signal_pid
;
4813 /* Send a SIGINT to the process group. This acts just like the user
4814 typed a ^C on the controlling terminal. */
4815 kill (-signal_pid
, SIGINT
);
4818 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4819 to debugger memory starting at MYADDR. */
4822 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4824 char filename
[PATH_MAX
];
4826 int pid
= lwpid_of (current_thread
);
4828 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4830 fd
= open (filename
, O_RDONLY
);
4834 if (offset
!= (CORE_ADDR
) 0
4835 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4838 n
= read (fd
, myaddr
, len
);
4845 /* These breakpoint and watchpoint related wrapper functions simply
4846 pass on the function call if the target has registered a
4847 corresponding function. */
4850 linux_supports_z_point_type (char z_type
)
4852 return (the_low_target
.supports_z_point_type
!= NULL
4853 && the_low_target
.supports_z_point_type (z_type
));
4857 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4858 int size
, struct raw_breakpoint
*bp
)
4860 if (the_low_target
.insert_point
!= NULL
)
4861 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4863 /* Unsupported (see target.h). */
4868 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4869 int size
, struct raw_breakpoint
*bp
)
4871 if (the_low_target
.remove_point
!= NULL
)
4872 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4874 /* Unsupported (see target.h). */
4879 linux_stopped_by_watchpoint (void)
4881 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4883 return lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
4887 linux_stopped_data_address (void)
4889 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4891 return lwp
->stopped_data_address
;
4894 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4895 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4896 && defined(PT_TEXT_END_ADDR)
4898 /* This is only used for targets that define PT_TEXT_ADDR,
4899 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4900 the target has different ways of acquiring this information, like
4903 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4904 to tell gdb about. */
4907 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4909 unsigned long text
, text_end
, data
;
4910 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4914 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4915 (PTRACE_TYPE_ARG4
) 0);
4916 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4917 (PTRACE_TYPE_ARG4
) 0);
4918 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4919 (PTRACE_TYPE_ARG4
) 0);
4923 /* Both text and data offsets produced at compile-time (and so
4924 used by gdb) are relative to the beginning of the program,
4925 with the data segment immediately following the text segment.
4926 However, the actual runtime layout in memory may put the data
4927 somewhere else, so when we send gdb a data base-address, we
4928 use the real data base address and subtract the compile-time
4929 data base-address from it (which is just the length of the
4930 text segment). BSS immediately follows data in both
4933 *data_p
= data
- (text_end
- text
);
4942 linux_qxfer_osdata (const char *annex
,
4943 unsigned char *readbuf
, unsigned const char *writebuf
,
4944 CORE_ADDR offset
, int len
)
4946 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4949 /* Convert a native/host siginfo object, into/from the siginfo in the
4950 layout of the inferiors' architecture. */
4953 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4957 if (the_low_target
.siginfo_fixup
!= NULL
)
4958 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4960 /* If there was no callback, or the callback didn't do anything,
4961 then just do a straight memcpy. */
4965 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4967 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4972 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4973 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4977 char inf_siginfo
[sizeof (siginfo_t
)];
4979 if (current_thread
== NULL
)
4982 pid
= lwpid_of (current_thread
);
4985 debug_printf ("%s siginfo for lwp %d.\n",
4986 readbuf
!= NULL
? "Reading" : "Writing",
4989 if (offset
>= sizeof (siginfo
))
4992 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4995 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4996 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4997 inferior with a 64-bit GDBSERVER should look the same as debugging it
4998 with a 32-bit GDBSERVER, we need to convert it. */
4999 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5001 if (offset
+ len
> sizeof (siginfo
))
5002 len
= sizeof (siginfo
) - offset
;
5004 if (readbuf
!= NULL
)
5005 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5008 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5010 /* Convert back to ptrace layout before flushing it out. */
5011 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5013 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5020 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5021 so we notice when children change state; as the handler for the
5022 sigsuspend in my_waitpid. */
5025 sigchld_handler (int signo
)
5027 int old_errno
= errno
;
5033 /* fprintf is not async-signal-safe, so call write
5035 if (write (2, "sigchld_handler\n",
5036 sizeof ("sigchld_handler\n") - 1) < 0)
5037 break; /* just ignore */
5041 if (target_is_async_p ())
5042 async_file_mark (); /* trigger a linux_wait */
5048 linux_supports_non_stop (void)
5054 linux_async (int enable
)
5056 int previous
= target_is_async_p ();
5059 debug_printf ("linux_async (%d), previous=%d\n",
5062 if (previous
!= enable
)
5065 sigemptyset (&mask
);
5066 sigaddset (&mask
, SIGCHLD
);
5068 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5072 if (pipe (linux_event_pipe
) == -1)
5074 linux_event_pipe
[0] = -1;
5075 linux_event_pipe
[1] = -1;
5076 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5078 warning ("creating event pipe failed.");
5082 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5083 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5085 /* Register the event loop handler. */
5086 add_file_handler (linux_event_pipe
[0],
5087 handle_target_event
, NULL
);
5089 /* Always trigger a linux_wait. */
5094 delete_file_handler (linux_event_pipe
[0]);
5096 close (linux_event_pipe
[0]);
5097 close (linux_event_pipe
[1]);
5098 linux_event_pipe
[0] = -1;
5099 linux_event_pipe
[1] = -1;
5102 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5109 linux_start_non_stop (int nonstop
)
5111 /* Register or unregister from event-loop accordingly. */
5112 linux_async (nonstop
);
5114 if (target_is_async_p () != (nonstop
!= 0))
5121 linux_supports_multi_process (void)
5127 linux_supports_disable_randomization (void)
5129 #ifdef HAVE_PERSONALITY
5137 linux_supports_agent (void)
5143 linux_supports_range_stepping (void)
5145 if (*the_low_target
.supports_range_stepping
== NULL
)
5148 return (*the_low_target
.supports_range_stepping
) ();
5151 /* Enumerate spufs IDs for process PID. */
5153 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5159 struct dirent
*entry
;
5161 sprintf (path
, "/proc/%ld/fd", pid
);
5162 dir
= opendir (path
);
5167 while ((entry
= readdir (dir
)) != NULL
)
5173 fd
= atoi (entry
->d_name
);
5177 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5178 if (stat (path
, &st
) != 0)
5180 if (!S_ISDIR (st
.st_mode
))
5183 if (statfs (path
, &stfs
) != 0)
5185 if (stfs
.f_type
!= SPUFS_MAGIC
)
5188 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5190 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5200 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5201 object type, using the /proc file system. */
5203 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5204 unsigned const char *writebuf
,
5205 CORE_ADDR offset
, int len
)
5207 long pid
= lwpid_of (current_thread
);
5212 if (!writebuf
&& !readbuf
)
5220 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5223 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5224 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5229 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5236 ret
= write (fd
, writebuf
, (size_t) len
);
5238 ret
= read (fd
, readbuf
, (size_t) len
);
5244 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5245 struct target_loadseg
5247 /* Core address to which the segment is mapped. */
5249 /* VMA recorded in the program header. */
5251 /* Size of this segment in memory. */
5255 # if defined PT_GETDSBT
5256 struct target_loadmap
5258 /* Protocol version number, must be zero. */
5260 /* Pointer to the DSBT table, its size, and the DSBT index. */
5261 unsigned *dsbt_table
;
5262 unsigned dsbt_size
, dsbt_index
;
5263 /* Number of segments in this map. */
5265 /* The actual memory map. */
5266 struct target_loadseg segs
[/*nsegs*/];
5268 # define LINUX_LOADMAP PT_GETDSBT
5269 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5270 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5272 struct target_loadmap
5274 /* Protocol version number, must be zero. */
5276 /* Number of segments in this map. */
5278 /* The actual memory map. */
5279 struct target_loadseg segs
[/*nsegs*/];
5281 # define LINUX_LOADMAP PTRACE_GETFDPIC
5282 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5283 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5287 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5288 unsigned char *myaddr
, unsigned int len
)
5290 int pid
= lwpid_of (current_thread
);
5292 struct target_loadmap
*data
= NULL
;
5293 unsigned int actual_length
, copy_length
;
5295 if (strcmp (annex
, "exec") == 0)
5296 addr
= (int) LINUX_LOADMAP_EXEC
;
5297 else if (strcmp (annex
, "interp") == 0)
5298 addr
= (int) LINUX_LOADMAP_INTERP
;
5302 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5308 actual_length
= sizeof (struct target_loadmap
)
5309 + sizeof (struct target_loadseg
) * data
->nsegs
;
5311 if (offset
< 0 || offset
> actual_length
)
5314 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5315 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5319 # define linux_read_loadmap NULL
5320 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5323 linux_process_qsupported (const char *query
)
5325 if (the_low_target
.process_qsupported
!= NULL
)
5326 the_low_target
.process_qsupported (query
);
5330 linux_supports_tracepoints (void)
5332 if (*the_low_target
.supports_tracepoints
== NULL
)
5335 return (*the_low_target
.supports_tracepoints
) ();
5339 linux_read_pc (struct regcache
*regcache
)
5341 if (the_low_target
.get_pc
== NULL
)
5344 return (*the_low_target
.get_pc
) (regcache
);
5348 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5350 gdb_assert (the_low_target
.set_pc
!= NULL
);
5352 (*the_low_target
.set_pc
) (regcache
, pc
);
5356 linux_thread_stopped (struct thread_info
*thread
)
5358 return get_thread_lwp (thread
)->stopped
;
5361 /* This exposes stop-all-threads functionality to other modules. */
5364 linux_pause_all (int freeze
)
5366 stop_all_lwps (freeze
, NULL
);
5369 /* This exposes unstop-all-threads functionality to other gdbserver
5373 linux_unpause_all (int unfreeze
)
5375 unstop_all_lwps (unfreeze
, NULL
);
5379 linux_prepare_to_access_memory (void)
5381 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5384 linux_pause_all (1);
5389 linux_done_accessing_memory (void)
5391 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5394 linux_unpause_all (1);
5398 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5399 CORE_ADDR collector
,
5402 CORE_ADDR
*jump_entry
,
5403 CORE_ADDR
*trampoline
,
5404 ULONGEST
*trampoline_size
,
5405 unsigned char *jjump_pad_insn
,
5406 ULONGEST
*jjump_pad_insn_size
,
5407 CORE_ADDR
*adjusted_insn_addr
,
5408 CORE_ADDR
*adjusted_insn_addr_end
,
5411 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5412 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5413 jump_entry
, trampoline
, trampoline_size
,
5414 jjump_pad_insn
, jjump_pad_insn_size
,
5415 adjusted_insn_addr
, adjusted_insn_addr_end
,
5419 static struct emit_ops
*
5420 linux_emit_ops (void)
5422 if (the_low_target
.emit_ops
!= NULL
)
5423 return (*the_low_target
.emit_ops
) ();
5429 linux_get_min_fast_tracepoint_insn_len (void)
5431 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5434 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5437 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5438 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5440 char filename
[PATH_MAX
];
5442 const int auxv_size
= is_elf64
5443 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5444 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5446 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5448 fd
= open (filename
, O_RDONLY
);
5454 while (read (fd
, buf
, auxv_size
) == auxv_size
5455 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5459 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5461 switch (aux
->a_type
)
5464 *phdr_memaddr
= aux
->a_un
.a_val
;
5467 *num_phdr
= aux
->a_un
.a_val
;
5473 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5475 switch (aux
->a_type
)
5478 *phdr_memaddr
= aux
->a_un
.a_val
;
5481 *num_phdr
= aux
->a_un
.a_val
;
5489 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5491 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5492 "phdr_memaddr = %ld, phdr_num = %d",
5493 (long) *phdr_memaddr
, *num_phdr
);
5500 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5503 get_dynamic (const int pid
, const int is_elf64
)
5505 CORE_ADDR phdr_memaddr
, relocation
;
5507 unsigned char *phdr_buf
;
5508 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5510 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5513 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5514 phdr_buf
= alloca (num_phdr
* phdr_size
);
5516 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5519 /* Compute relocation: it is expected to be 0 for "regular" executables,
5520 non-zero for PIE ones. */
5522 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5525 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5527 if (p
->p_type
== PT_PHDR
)
5528 relocation
= phdr_memaddr
- p
->p_vaddr
;
5532 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5534 if (p
->p_type
== PT_PHDR
)
5535 relocation
= phdr_memaddr
- p
->p_vaddr
;
5538 if (relocation
== -1)
5540 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5541 any real world executables, including PIE executables, have always
5542 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5543 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5544 or present DT_DEBUG anyway (fpc binaries are statically linked).
5546 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5548 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5553 for (i
= 0; i
< num_phdr
; i
++)
5557 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5559 if (p
->p_type
== PT_DYNAMIC
)
5560 return p
->p_vaddr
+ relocation
;
5564 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5566 if (p
->p_type
== PT_DYNAMIC
)
5567 return p
->p_vaddr
+ relocation
;
5574 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5575 can be 0 if the inferior does not yet have the library list initialized.
5576 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5577 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5580 get_r_debug (const int pid
, const int is_elf64
)
5582 CORE_ADDR dynamic_memaddr
;
5583 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5584 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5587 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5588 if (dynamic_memaddr
== 0)
5591 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5595 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5596 #ifdef DT_MIPS_RLD_MAP
5600 unsigned char buf
[sizeof (Elf64_Xword
)];
5604 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5606 if (linux_read_memory (dyn
->d_un
.d_val
,
5607 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5612 #endif /* DT_MIPS_RLD_MAP */
5614 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5615 map
= dyn
->d_un
.d_val
;
5617 if (dyn
->d_tag
== DT_NULL
)
5622 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5623 #ifdef DT_MIPS_RLD_MAP
5627 unsigned char buf
[sizeof (Elf32_Word
)];
5631 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5633 if (linux_read_memory (dyn
->d_un
.d_val
,
5634 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5639 #endif /* DT_MIPS_RLD_MAP */
5641 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5642 map
= dyn
->d_un
.d_val
;
5644 if (dyn
->d_tag
== DT_NULL
)
5648 dynamic_memaddr
+= dyn_size
;
5654 /* Read one pointer from MEMADDR in the inferior. */
5657 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5661 /* Go through a union so this works on either big or little endian
5662 hosts, when the inferior's pointer size is smaller than the size
5663 of CORE_ADDR. It is assumed the inferior's endianness is the
5664 same of the superior's. */
5667 CORE_ADDR core_addr
;
5672 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5675 if (ptr_size
== sizeof (CORE_ADDR
))
5676 *ptr
= addr
.core_addr
;
5677 else if (ptr_size
== sizeof (unsigned int))
5680 gdb_assert_not_reached ("unhandled pointer size");
5685 struct link_map_offsets
5687 /* Offset and size of r_debug.r_version. */
5688 int r_version_offset
;
5690 /* Offset and size of r_debug.r_map. */
5693 /* Offset to l_addr field in struct link_map. */
5696 /* Offset to l_name field in struct link_map. */
5699 /* Offset to l_ld field in struct link_map. */
5702 /* Offset to l_next field in struct link_map. */
5705 /* Offset to l_prev field in struct link_map. */
5709 /* Construct qXfer:libraries-svr4:read reply. */
5712 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5713 unsigned const char *writebuf
,
5714 CORE_ADDR offset
, int len
)
5717 unsigned document_len
;
5718 struct process_info_private
*const priv
= current_process ()->private;
5719 char filename
[PATH_MAX
];
5722 static const struct link_map_offsets lmo_32bit_offsets
=
5724 0, /* r_version offset. */
5725 4, /* r_debug.r_map offset. */
5726 0, /* l_addr offset in link_map. */
5727 4, /* l_name offset in link_map. */
5728 8, /* l_ld offset in link_map. */
5729 12, /* l_next offset in link_map. */
5730 16 /* l_prev offset in link_map. */
5733 static const struct link_map_offsets lmo_64bit_offsets
=
5735 0, /* r_version offset. */
5736 8, /* r_debug.r_map offset. */
5737 0, /* l_addr offset in link_map. */
5738 8, /* l_name offset in link_map. */
5739 16, /* l_ld offset in link_map. */
5740 24, /* l_next offset in link_map. */
5741 32 /* l_prev offset in link_map. */
5743 const struct link_map_offsets
*lmo
;
5744 unsigned int machine
;
5746 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5747 int allocated
= 1024;
5749 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5750 int header_done
= 0;
5752 if (writebuf
!= NULL
)
5754 if (readbuf
== NULL
)
5757 pid
= lwpid_of (current_thread
);
5758 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5759 is_elf64
= elf_64_file_p (filename
, &machine
);
5760 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5761 ptr_size
= is_elf64
? 8 : 4;
5763 while (annex
[0] != '\0')
5769 sep
= strchr (annex
, '=');
5774 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5776 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5780 annex
= strchr (sep
, ';');
5787 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5794 if (priv
->r_debug
== 0)
5795 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5797 /* We failed to find DT_DEBUG. Such situation will not change
5798 for this inferior - do not retry it. Report it to GDB as
5799 E01, see for the reasons at the GDB solib-svr4.c side. */
5800 if (priv
->r_debug
== (CORE_ADDR
) -1)
5803 if (priv
->r_debug
!= 0)
5805 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5806 (unsigned char *) &r_version
,
5807 sizeof (r_version
)) != 0
5810 warning ("unexpected r_debug version %d", r_version
);
5812 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5813 &lm_addr
, ptr_size
) != 0)
5815 warning ("unable to read r_map from 0x%lx",
5816 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5821 document
= xmalloc (allocated
);
5822 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5823 p
= document
+ strlen (document
);
5826 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5827 &l_name
, ptr_size
) == 0
5828 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5829 &l_addr
, ptr_size
) == 0
5830 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5831 &l_ld
, ptr_size
) == 0
5832 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5833 &l_prev
, ptr_size
) == 0
5834 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5835 &l_next
, ptr_size
) == 0)
5837 unsigned char libname
[PATH_MAX
];
5839 if (lm_prev
!= l_prev
)
5841 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5842 (long) lm_prev
, (long) l_prev
);
5846 /* Ignore the first entry even if it has valid name as the first entry
5847 corresponds to the main executable. The first entry should not be
5848 skipped if the dynamic loader was loaded late by a static executable
5849 (see solib-svr4.c parameter ignore_first). But in such case the main
5850 executable does not have PT_DYNAMIC present and this function already
5851 exited above due to failed get_r_debug. */
5854 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5859 /* Not checking for error because reading may stop before
5860 we've got PATH_MAX worth of characters. */
5862 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5863 libname
[sizeof (libname
) - 1] = '\0';
5864 if (libname
[0] != '\0')
5866 /* 6x the size for xml_escape_text below. */
5867 size_t len
= 6 * strlen ((char *) libname
);
5872 /* Terminate `<library-list-svr4'. */
5877 while (allocated
< p
- document
+ len
+ 200)
5879 /* Expand to guarantee sufficient storage. */
5880 uintptr_t document_len
= p
- document
;
5882 document
= xrealloc (document
, 2 * allocated
);
5884 p
= document
+ document_len
;
5887 name
= xml_escape_text ((char *) libname
);
5888 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5889 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5890 name
, (unsigned long) lm_addr
,
5891 (unsigned long) l_addr
, (unsigned long) l_ld
);
5902 /* Empty list; terminate `<library-list-svr4'. */
5906 strcpy (p
, "</library-list-svr4>");
5908 document_len
= strlen (document
);
5909 if (offset
< document_len
)
5910 document_len
-= offset
;
5913 if (len
> document_len
)
5916 memcpy (readbuf
, document
+ offset
, len
);
5922 #ifdef HAVE_LINUX_BTRACE
5924 /* See to_enable_btrace target method. */
5926 static struct btrace_target_info
*
5927 linux_low_enable_btrace (ptid_t ptid
)
5929 struct btrace_target_info
*tinfo
;
5931 tinfo
= linux_enable_btrace (ptid
);
5935 struct thread_info
*thread
= find_thread_ptid (ptid
);
5936 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5938 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5944 /* See to_disable_btrace target method. */
5947 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5949 enum btrace_error err
;
5951 err
= linux_disable_btrace (tinfo
);
5952 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5955 /* See to_read_btrace target method. */
5958 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5961 VEC (btrace_block_s
) *btrace
;
5962 struct btrace_block
*block
;
5963 enum btrace_error err
;
5967 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5968 if (err
!= BTRACE_ERR_NONE
)
5970 if (err
== BTRACE_ERR_OVERFLOW
)
5971 buffer_grow_str0 (buffer
, "E.Overflow.");
5973 buffer_grow_str0 (buffer
, "E.Generic Error.");
5978 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5979 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5981 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5982 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5983 paddress (block
->begin
), paddress (block
->end
));
5985 buffer_grow_str0 (buffer
, "</btrace>\n");
5987 VEC_free (btrace_block_s
, btrace
);
5991 #endif /* HAVE_LINUX_BTRACE */
5993 static struct target_ops linux_target_ops
= {
5994 linux_create_inferior
,
6003 linux_fetch_registers
,
6004 linux_store_registers
,
6005 linux_prepare_to_access_memory
,
6006 linux_done_accessing_memory
,
6009 linux_look_up_symbols
,
6010 linux_request_interrupt
,
6012 linux_supports_z_point_type
,
6015 linux_stopped_by_watchpoint
,
6016 linux_stopped_data_address
,
6017 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6018 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6019 && defined(PT_TEXT_END_ADDR)
6024 #ifdef USE_THREAD_DB
6025 thread_db_get_tls_address
,
6030 hostio_last_error_from_errno
,
6033 linux_supports_non_stop
,
6035 linux_start_non_stop
,
6036 linux_supports_multi_process
,
6037 #ifdef USE_THREAD_DB
6038 thread_db_handle_monitor_command
,
6042 linux_common_core_of_thread
,
6044 linux_process_qsupported
,
6045 linux_supports_tracepoints
,
6048 linux_thread_stopped
,
6052 linux_stabilize_threads
,
6053 linux_install_fast_tracepoint_jump_pad
,
6055 linux_supports_disable_randomization
,
6056 linux_get_min_fast_tracepoint_insn_len
,
6057 linux_qxfer_libraries_svr4
,
6058 linux_supports_agent
,
6059 #ifdef HAVE_LINUX_BTRACE
6060 linux_supports_btrace
,
6061 linux_low_enable_btrace
,
6062 linux_low_disable_btrace
,
6063 linux_low_read_btrace
,
6070 linux_supports_range_stepping
,
6074 linux_init_signals ()
6076 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6077 to find what the cancel signal actually is. */
6078 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6079 signal (__SIGRTMIN
+1, SIG_IGN
);
6083 #ifdef HAVE_LINUX_REGSETS
6085 initialize_regsets_info (struct regsets_info
*info
)
6087 for (info
->num_regsets
= 0;
6088 info
->regsets
[info
->num_regsets
].size
>= 0;
6089 info
->num_regsets
++)
6095 initialize_low (void)
6097 struct sigaction sigchld_action
;
6098 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6099 set_target_ops (&linux_target_ops
);
6100 set_breakpoint_data (the_low_target
.breakpoint
,
6101 the_low_target
.breakpoint_len
);
6102 linux_init_signals ();
6103 linux_ptrace_init_warnings ();
6105 sigchld_action
.sa_handler
= sigchld_handler
;
6106 sigemptyset (&sigchld_action
.sa_mask
);
6107 sigchld_action
.sa_flags
= SA_RESTART
;
6108 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6110 initialize_low_arch ();