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"
106 # include "btrace-common.h"
109 #ifndef HAVE_ELF32_AUXV_T
110 /* Copied from glibc's elf.h. */
113 uint32_t a_type
; /* Entry type */
116 uint32_t a_val
; /* Integer value */
117 /* We use to have pointer elements added here. We cannot do that,
118 though, since it does not work when using 32-bit definitions
119 on 64-bit platforms and vice versa. */
124 #ifndef HAVE_ELF64_AUXV_T
125 /* Copied from glibc's elf.h. */
128 uint64_t a_type
; /* Entry type */
131 uint64_t a_val
; /* Integer value */
132 /* We use to have pointer elements added here. We cannot do that,
133 though, since it does not work when using 32-bit definitions
134 on 64-bit platforms and vice versa. */
139 /* A list of all unknown processes which receive stop signals. Some
140 other process will presumably claim each of these as forked
141 children momentarily. */
143 struct simple_pid_list
145 /* The process ID. */
148 /* The status as reported by waitpid. */
152 struct simple_pid_list
*next
;
154 struct simple_pid_list
*stopped_pids
;
156 /* Trivial list manipulation functions to keep track of a list of new
157 stopped processes. */
160 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
162 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
165 new_pid
->status
= status
;
166 new_pid
->next
= *listp
;
171 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
173 struct simple_pid_list
**p
;
175 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
176 if ((*p
)->pid
== pid
)
178 struct simple_pid_list
*next
= (*p
)->next
;
180 *statusp
= (*p
)->status
;
188 enum stopping_threads_kind
190 /* Not stopping threads presently. */
191 NOT_STOPPING_THREADS
,
193 /* Stopping threads. */
196 /* Stopping and suspending threads. */
197 STOPPING_AND_SUSPENDING_THREADS
200 /* This is set while stop_all_lwps is in effect. */
201 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
203 /* FIXME make into a target method? */
204 int using_threads
= 1;
206 /* True if we're presently stabilizing threads (moving them out of
208 static int stabilizing_threads
;
210 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
211 int step
, int signal
, siginfo_t
*info
);
212 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
213 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
214 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
215 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
216 int *wstat
, int options
);
217 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
218 static struct lwp_info
*add_lwp (ptid_t ptid
);
219 static int linux_stopped_by_watchpoint (void);
220 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
221 static void proceed_all_lwps (void);
222 static int finish_step_over (struct lwp_info
*lwp
);
223 static int kill_lwp (unsigned long lwpid
, int signo
);
225 /* When the event-loop is doing a step-over, this points at the thread
227 ptid_t step_over_bkpt
;
229 /* True if the low target can hardware single-step. Such targets
230 don't need a BREAKPOINT_REINSERT_ADDR callback. */
233 can_hardware_single_step (void)
235 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
238 /* True if the low target supports memory breakpoints. If so, we'll
239 have a GET_PC implementation. */
242 supports_breakpoints (void)
244 return (the_low_target
.get_pc
!= NULL
);
247 /* Returns true if this target can support fast tracepoints. This
248 does not mean that the in-process agent has been loaded in the
252 supports_fast_tracepoints (void)
254 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
257 /* True if LWP is stopped in its stepping range. */
260 lwp_in_step_range (struct lwp_info
*lwp
)
262 CORE_ADDR pc
= lwp
->stop_pc
;
264 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
267 struct pending_signals
271 struct pending_signals
*prev
;
274 /* The read/write ends of the pipe registered as waitable file in the
276 static int linux_event_pipe
[2] = { -1, -1 };
278 /* True if we're currently in async mode. */
279 #define target_is_async_p() (linux_event_pipe[0] != -1)
281 static void send_sigstop (struct lwp_info
*lwp
);
282 static void wait_for_sigstop (void);
284 /* Return non-zero if HEADER is a 64-bit ELF file. */
287 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
289 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
290 && header
->e_ident
[EI_MAG1
] == ELFMAG1
291 && header
->e_ident
[EI_MAG2
] == ELFMAG2
292 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
294 *machine
= header
->e_machine
;
295 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
302 /* Return non-zero if FILE is a 64-bit ELF file,
303 zero if the file is not a 64-bit ELF file,
304 and -1 if the file is not accessible or doesn't exist. */
307 elf_64_file_p (const char *file
, unsigned int *machine
)
312 fd
= open (file
, O_RDONLY
);
316 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
323 return elf_64_header_p (&header
, machine
);
326 /* Accepts an integer PID; Returns true if the executable PID is
327 running is a 64-bit ELF file.. */
330 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
334 sprintf (file
, "/proc/%d/exe", pid
);
335 return elf_64_file_p (file
, machine
);
339 delete_lwp (struct lwp_info
*lwp
)
341 struct thread_info
*thr
= get_lwp_thread (lwp
);
344 debug_printf ("deleting %ld\n", lwpid_of (thr
));
347 free (lwp
->arch_private
);
351 /* Add a process to the common process list, and set its private
354 static struct process_info
*
355 linux_add_process (int pid
, int attached
)
357 struct process_info
*proc
;
359 proc
= add_process (pid
, attached
);
360 proc
->priv
= xcalloc (1, sizeof (*proc
->priv
));
362 /* Set the arch when the first LWP stops. */
363 proc
->priv
->new_inferior
= 1;
365 if (the_low_target
.new_process
!= NULL
)
366 proc
->priv
->arch_private
= the_low_target
.new_process ();
371 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
373 /* Handle a GNU/Linux extended wait response. If we see a clone
374 event, we need to add the new LWP to our list (and not report the
375 trap to higher layers). */
378 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
380 int event
= linux_ptrace_get_extended_event (wstat
);
381 struct thread_info
*event_thr
= get_lwp_thread (event_child
);
382 struct lwp_info
*new_lwp
;
384 if (event
== PTRACE_EVENT_CLONE
)
387 unsigned long new_pid
;
390 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
393 /* If we haven't already seen the new PID stop, wait for it now. */
394 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
396 /* The new child has a pending SIGSTOP. We can't affect it until it
397 hits the SIGSTOP, but we're already attached. */
399 ret
= my_waitpid (new_pid
, &status
, __WALL
);
402 perror_with_name ("waiting for new child");
403 else if (ret
!= new_pid
)
404 warning ("wait returned unexpected PID %d", ret
);
405 else if (!WIFSTOPPED (status
))
406 warning ("wait returned unexpected status 0x%x", status
);
410 debug_printf ("HEW: Got clone event "
411 "from LWP %ld, new child is LWP %ld\n",
412 lwpid_of (event_thr
), new_pid
);
414 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
415 new_lwp
= add_lwp (ptid
);
417 /* Either we're going to immediately resume the new thread
418 or leave it stopped. linux_resume_one_lwp is a nop if it
419 thinks the thread is currently running, so set this first
420 before calling linux_resume_one_lwp. */
421 new_lwp
->stopped
= 1;
423 /* If we're suspending all threads, leave this one suspended
425 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
426 new_lwp
->suspended
= 1;
428 /* Normally we will get the pending SIGSTOP. But in some cases
429 we might get another signal delivered to the group first.
430 If we do get another signal, be sure not to lose it. */
431 if (WSTOPSIG (status
) != SIGSTOP
)
433 new_lwp
->stop_expected
= 1;
434 new_lwp
->status_pending_p
= 1;
435 new_lwp
->status_pending
= status
;
440 /* Return the PC as read from the regcache of LWP, without any
444 get_pc (struct lwp_info
*lwp
)
446 struct thread_info
*saved_thread
;
447 struct regcache
*regcache
;
450 if (the_low_target
.get_pc
== NULL
)
453 saved_thread
= current_thread
;
454 current_thread
= get_lwp_thread (lwp
);
456 regcache
= get_thread_regcache (current_thread
, 1);
457 pc
= (*the_low_target
.get_pc
) (regcache
);
460 debug_printf ("pc is 0x%lx\n", (long) pc
);
462 current_thread
= saved_thread
;
466 /* This function should only be called if LWP got a SIGTRAP.
467 The SIGTRAP could mean several things.
469 On i386, where decr_pc_after_break is non-zero:
471 If we were single-stepping this process using PTRACE_SINGLESTEP, we
472 will get only the one SIGTRAP. The value of $eip will be the next
473 instruction. If the instruction we stepped over was a breakpoint,
474 we need to decrement the PC.
476 If we continue the process using PTRACE_CONT, we will get a
477 SIGTRAP when we hit a breakpoint. The value of $eip will be
478 the instruction after the breakpoint (i.e. needs to be
479 decremented). If we report the SIGTRAP to GDB, we must also
480 report the undecremented PC. If the breakpoint is removed, we
481 must resume at the decremented PC.
483 On a non-decr_pc_after_break machine with hardware or kernel
486 If we either single-step a breakpoint instruction, or continue and
487 hit a breakpoint instruction, our PC will point at the breakpoint
491 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
494 CORE_ADDR sw_breakpoint_pc
;
495 struct thread_info
*saved_thread
;
496 #if USE_SIGTRAP_SIGINFO
500 if (the_low_target
.get_pc
== NULL
)
504 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
506 /* breakpoint_at reads from the current thread. */
507 saved_thread
= current_thread
;
508 current_thread
= get_lwp_thread (lwp
);
510 #if USE_SIGTRAP_SIGINFO
511 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
512 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
514 if (siginfo
.si_signo
== SIGTRAP
)
516 if (siginfo
.si_code
== GDB_ARCH_TRAP_BRKPT
)
520 struct thread_info
*thr
= get_lwp_thread (lwp
);
522 debug_printf ("CSBB: Push back software breakpoint for %s\n",
523 target_pid_to_str (ptid_of (thr
)));
526 /* Back up the PC if necessary. */
527 if (pc
!= sw_breakpoint_pc
)
529 struct regcache
*regcache
530 = get_thread_regcache (current_thread
, 1);
531 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
534 lwp
->stop_pc
= sw_breakpoint_pc
;
535 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
536 current_thread
= saved_thread
;
539 else if (siginfo
.si_code
== TRAP_HWBKPT
)
543 struct thread_info
*thr
= get_lwp_thread (lwp
);
545 debug_printf ("CSBB: Push back hardware "
546 "breakpoint/watchpoint for %s\n",
547 target_pid_to_str (ptid_of (thr
)));
551 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
552 current_thread
= saved_thread
;
558 /* We may have just stepped a breakpoint instruction. E.g., in
559 non-stop mode, GDB first tells the thread A to step a range, and
560 then the user inserts a breakpoint inside the range. In that
561 case we need to report the breakpoint PC. */
562 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
563 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
567 struct thread_info
*thr
= get_lwp_thread (lwp
);
569 debug_printf ("CSBB: %s stopped by software breakpoint\n",
570 target_pid_to_str (ptid_of (thr
)));
573 /* Back up the PC if necessary. */
574 if (pc
!= sw_breakpoint_pc
)
576 struct regcache
*regcache
577 = get_thread_regcache (current_thread
, 1);
578 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
581 lwp
->stop_pc
= sw_breakpoint_pc
;
582 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
583 current_thread
= saved_thread
;
587 if (hardware_breakpoint_inserted_here (pc
))
591 struct thread_info
*thr
= get_lwp_thread (lwp
);
593 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
594 target_pid_to_str (ptid_of (thr
)));
598 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
599 current_thread
= saved_thread
;
604 current_thread
= saved_thread
;
608 static struct lwp_info
*
609 add_lwp (ptid_t ptid
)
611 struct lwp_info
*lwp
;
613 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
614 memset (lwp
, 0, sizeof (*lwp
));
616 if (the_low_target
.new_thread
!= NULL
)
617 lwp
->arch_private
= the_low_target
.new_thread ();
619 lwp
->thread
= add_thread (ptid
, lwp
);
624 /* Start an inferior process and returns its pid.
625 ALLARGS is a vector of program-name and args. */
628 linux_create_inferior (char *program
, char **allargs
)
630 struct lwp_info
*new_lwp
;
633 struct cleanup
*restore_personality
634 = maybe_disable_address_space_randomization (disable_randomization
);
636 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
642 perror_with_name ("fork");
647 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
649 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
650 signal (__SIGRTMIN
+ 1, SIG_DFL
);
655 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
656 stdout to stderr so that inferior i/o doesn't corrupt the connection.
657 Also, redirect stdin to /dev/null. */
658 if (remote_connection_is_stdio ())
661 open ("/dev/null", O_RDONLY
);
663 if (write (2, "stdin/stdout redirected\n",
664 sizeof ("stdin/stdout redirected\n") - 1) < 0)
666 /* Errors ignored. */;
670 execv (program
, allargs
);
672 execvp (program
, allargs
);
674 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
680 do_cleanups (restore_personality
);
682 linux_add_process (pid
, 0);
684 ptid
= ptid_build (pid
, pid
, 0);
685 new_lwp
= add_lwp (ptid
);
686 new_lwp
->must_set_ptrace_flags
= 1;
691 /* Attach to an inferior process. Returns 0 on success, ERRNO on
695 linux_attach_lwp (ptid_t ptid
)
697 struct lwp_info
*new_lwp
;
698 int lwpid
= ptid_get_lwp (ptid
);
700 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
704 new_lwp
= add_lwp (ptid
);
706 /* We need to wait for SIGSTOP before being able to make the next
707 ptrace call on this LWP. */
708 new_lwp
->must_set_ptrace_flags
= 1;
710 if (linux_proc_pid_is_stopped (lwpid
))
713 debug_printf ("Attached to a stopped process\n");
715 /* The process is definitely stopped. It is in a job control
716 stop, unless the kernel predates the TASK_STOPPED /
717 TASK_TRACED distinction, in which case it might be in a
718 ptrace stop. Make sure it is in a ptrace stop; from there we
719 can kill it, signal it, et cetera.
721 First make sure there is a pending SIGSTOP. Since we are
722 already attached, the process can not transition from stopped
723 to running without a PTRACE_CONT; so we know this signal will
724 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
725 probably already in the queue (unless this kernel is old
726 enough to use TASK_STOPPED for ptrace stops); but since
727 SIGSTOP is not an RT signal, it can only be queued once. */
728 kill_lwp (lwpid
, SIGSTOP
);
730 /* Finally, resume the stopped process. This will deliver the
731 SIGSTOP (or a higher priority signal, just like normal
732 PTRACE_ATTACH), which we'll catch later on. */
733 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
736 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
739 There are several cases to consider here:
741 1) gdbserver has already attached to the process and is being notified
742 of a new thread that is being created.
743 In this case we should ignore that SIGSTOP and resume the
744 process. This is handled below by setting stop_expected = 1,
745 and the fact that add_thread sets last_resume_kind ==
748 2) This is the first thread (the process thread), and we're attaching
749 to it via attach_inferior.
750 In this case we want the process thread to stop.
751 This is handled by having linux_attach set last_resume_kind ==
752 resume_stop after we return.
754 If the pid we are attaching to is also the tgid, we attach to and
755 stop all the existing threads. Otherwise, we attach to pid and
756 ignore any other threads in the same group as this pid.
758 3) GDB is connecting to gdbserver and is requesting an enumeration of all
760 In this case we want the thread to stop.
761 FIXME: This case is currently not properly handled.
762 We should wait for the SIGSTOP but don't. Things work apparently
763 because enough time passes between when we ptrace (ATTACH) and when
764 gdb makes the next ptrace call on the thread.
766 On the other hand, if we are currently trying to stop all threads, we
767 should treat the new thread as if we had sent it a SIGSTOP. This works
768 because we are guaranteed that the add_lwp call above added us to the
769 end of the list, and so the new thread has not yet reached
770 wait_for_sigstop (but will). */
771 new_lwp
->stop_expected
= 1;
776 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
777 already attached. Returns true if a new LWP is found, false
781 attach_proc_task_lwp_callback (ptid_t ptid
)
783 /* Is this a new thread? */
784 if (find_thread_ptid (ptid
) == NULL
)
786 int lwpid
= ptid_get_lwp (ptid
);
790 debug_printf ("Found new lwp %d\n", lwpid
);
792 err
= linux_attach_lwp (ptid
);
794 /* Be quiet if we simply raced with the thread exiting. EPERM
795 is returned if the thread's task still exists, and is marked
796 as exited or zombie, as well as other conditions, so in that
797 case, confirm the status in /proc/PID/status. */
799 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
803 debug_printf ("Cannot attach to lwp %d: "
804 "thread is gone (%d: %s)\n",
805 lwpid
, err
, strerror (err
));
810 warning (_("Cannot attach to lwp %d: %s"),
812 linux_ptrace_attach_fail_reason_string (ptid
, err
));
820 /* Attach to PID. If PID is the tgid, attach to it and all
824 linux_attach (unsigned long pid
)
826 ptid_t ptid
= ptid_build (pid
, pid
, 0);
829 /* Attach to PID. We will check for other threads
831 err
= linux_attach_lwp (ptid
);
833 error ("Cannot attach to process %ld: %s",
834 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
836 linux_add_process (pid
, 1);
840 struct thread_info
*thread
;
842 /* Don't ignore the initial SIGSTOP if we just attached to this
843 process. It will be collected by wait shortly. */
844 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
845 thread
->last_resume_kind
= resume_stop
;
848 /* We must attach to every LWP. If /proc is mounted, use that to
849 find them now. On the one hand, the inferior may be using raw
850 clone instead of using pthreads. On the other hand, even if it
851 is using pthreads, GDB may not be connected yet (thread_db needs
852 to do symbol lookups, through qSymbol). Also, thread_db walks
853 structures in the inferior's address space to find the list of
854 threads/LWPs, and those structures may well be corrupted. Note
855 that once thread_db is loaded, we'll still use it to list threads
856 and associate pthread info with each LWP. */
857 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
868 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
870 struct counter
*counter
= args
;
872 if (ptid_get_pid (entry
->id
) == counter
->pid
)
874 if (++counter
->count
> 1)
882 last_thread_of_process_p (int pid
)
884 struct counter counter
= { pid
, 0 };
886 return (find_inferior (&all_threads
,
887 second_thread_of_pid_p
, &counter
) == NULL
);
893 linux_kill_one_lwp (struct lwp_info
*lwp
)
895 struct thread_info
*thr
= get_lwp_thread (lwp
);
896 int pid
= lwpid_of (thr
);
898 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
899 there is no signal context, and ptrace(PTRACE_KILL) (or
900 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
901 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
902 alternative is to kill with SIGKILL. We only need one SIGKILL
903 per process, not one for each thread. But since we still support
904 linuxthreads, and we also support debugging programs using raw
905 clone without CLONE_THREAD, we send one for each thread. For
906 years, we used PTRACE_KILL only, so we're being a bit paranoid
907 about some old kernels where PTRACE_KILL might work better
908 (dubious if there are any such, but that's why it's paranoia), so
909 we try SIGKILL first, PTRACE_KILL second, and so we're fine
913 kill_lwp (pid
, SIGKILL
);
916 int save_errno
= errno
;
918 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
919 target_pid_to_str (ptid_of (thr
)),
920 save_errno
? strerror (save_errno
) : "OK");
924 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
927 int save_errno
= errno
;
929 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
930 target_pid_to_str (ptid_of (thr
)),
931 save_errno
? strerror (save_errno
) : "OK");
935 /* Kill LWP and wait for it to die. */
938 kill_wait_lwp (struct lwp_info
*lwp
)
940 struct thread_info
*thr
= get_lwp_thread (lwp
);
941 int pid
= ptid_get_pid (ptid_of (thr
));
942 int lwpid
= ptid_get_lwp (ptid_of (thr
));
947 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
951 linux_kill_one_lwp (lwp
);
953 /* Make sure it died. Notes:
955 - The loop is most likely unnecessary.
957 - We don't use linux_wait_for_event as that could delete lwps
958 while we're iterating over them. We're not interested in
959 any pending status at this point, only in making sure all
960 wait status on the kernel side are collected until the
963 - We don't use __WALL here as the __WALL emulation relies on
964 SIGCHLD, and killing a stopped process doesn't generate
965 one, nor an exit status.
967 res
= my_waitpid (lwpid
, &wstat
, 0);
968 if (res
== -1 && errno
== ECHILD
)
969 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
970 } while (res
> 0 && WIFSTOPPED (wstat
));
972 gdb_assert (res
> 0);
975 /* Callback for `find_inferior'. Kills an lwp of a given process,
976 except the leader. */
979 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
981 struct thread_info
*thread
= (struct thread_info
*) entry
;
982 struct lwp_info
*lwp
= get_thread_lwp (thread
);
983 int pid
= * (int *) args
;
985 if (ptid_get_pid (entry
->id
) != pid
)
988 /* We avoid killing the first thread here, because of a Linux kernel (at
989 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
990 the children get a chance to be reaped, it will remain a zombie
993 if (lwpid_of (thread
) == pid
)
996 debug_printf ("lkop: is last of process %s\n",
997 target_pid_to_str (entry
->id
));
1001 kill_wait_lwp (lwp
);
1006 linux_kill (int pid
)
1008 struct process_info
*process
;
1009 struct lwp_info
*lwp
;
1011 process
= find_process_pid (pid
);
1012 if (process
== NULL
)
1015 /* If we're killing a running inferior, make sure it is stopped
1016 first, as PTRACE_KILL will not work otherwise. */
1017 stop_all_lwps (0, NULL
);
1019 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1021 /* See the comment in linux_kill_one_lwp. We did not kill the first
1022 thread in the list, so do so now. */
1023 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1028 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1032 kill_wait_lwp (lwp
);
1034 the_target
->mourn (process
);
1036 /* Since we presently can only stop all lwps of all processes, we
1037 need to unstop lwps of other processes. */
1038 unstop_all_lwps (0, NULL
);
1042 /* Get pending signal of THREAD, for detaching purposes. This is the
1043 signal the thread last stopped for, which we need to deliver to the
1044 thread when detaching, otherwise, it'd be suppressed/lost. */
1047 get_detach_signal (struct thread_info
*thread
)
1049 enum gdb_signal signo
= GDB_SIGNAL_0
;
1051 struct lwp_info
*lp
= get_thread_lwp (thread
);
1053 if (lp
->status_pending_p
)
1054 status
= lp
->status_pending
;
1057 /* If the thread had been suspended by gdbserver, and it stopped
1058 cleanly, then it'll have stopped with SIGSTOP. But we don't
1059 want to deliver that SIGSTOP. */
1060 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1061 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1064 /* Otherwise, we may need to deliver the signal we
1066 status
= lp
->last_status
;
1069 if (!WIFSTOPPED (status
))
1072 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1073 target_pid_to_str (ptid_of (thread
)));
1077 /* Extended wait statuses aren't real SIGTRAPs. */
1078 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1081 debug_printf ("GPS: lwp %s had stopped with extended "
1082 "status: no pending signal\n",
1083 target_pid_to_str (ptid_of (thread
)));
1087 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1089 if (program_signals_p
&& !program_signals
[signo
])
1092 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1093 target_pid_to_str (ptid_of (thread
)),
1094 gdb_signal_to_string (signo
));
1097 else if (!program_signals_p
1098 /* If we have no way to know which signals GDB does not
1099 want to have passed to the program, assume
1100 SIGTRAP/SIGINT, which is GDB's default. */
1101 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1104 debug_printf ("GPS: lwp %s had signal %s, "
1105 "but we don't know if we should pass it. "
1106 "Default to not.\n",
1107 target_pid_to_str (ptid_of (thread
)),
1108 gdb_signal_to_string (signo
));
1114 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1115 target_pid_to_str (ptid_of (thread
)),
1116 gdb_signal_to_string (signo
));
1118 return WSTOPSIG (status
);
1123 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1125 struct thread_info
*thread
= (struct thread_info
*) entry
;
1126 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1127 int pid
= * (int *) args
;
1130 if (ptid_get_pid (entry
->id
) != pid
)
1133 /* If there is a pending SIGSTOP, get rid of it. */
1134 if (lwp
->stop_expected
)
1137 debug_printf ("Sending SIGCONT to %s\n",
1138 target_pid_to_str (ptid_of (thread
)));
1140 kill_lwp (lwpid_of (thread
), SIGCONT
);
1141 lwp
->stop_expected
= 0;
1144 /* Flush any pending changes to the process's registers. */
1145 regcache_invalidate_thread (thread
);
1147 /* Pass on any pending signal for this thread. */
1148 sig
= get_detach_signal (thread
);
1150 /* Finally, let it resume. */
1151 if (the_low_target
.prepare_to_resume
!= NULL
)
1152 the_low_target
.prepare_to_resume (lwp
);
1153 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1154 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1155 error (_("Can't detach %s: %s"),
1156 target_pid_to_str (ptid_of (thread
)),
1164 linux_detach (int pid
)
1166 struct process_info
*process
;
1168 process
= find_process_pid (pid
);
1169 if (process
== NULL
)
1172 /* Stop all threads before detaching. First, ptrace requires that
1173 the thread is stopped to sucessfully detach. Second, thread_db
1174 may need to uninstall thread event breakpoints from memory, which
1175 only works with a stopped process anyway. */
1176 stop_all_lwps (0, NULL
);
1178 #ifdef USE_THREAD_DB
1179 thread_db_detach (process
);
1182 /* Stabilize threads (move out of jump pads). */
1183 stabilize_threads ();
1185 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1187 the_target
->mourn (process
);
1189 /* Since we presently can only stop all lwps of all processes, we
1190 need to unstop lwps of other processes. */
1191 unstop_all_lwps (0, NULL
);
1195 /* Remove all LWPs that belong to process PROC from the lwp list. */
1198 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1200 struct thread_info
*thread
= (struct thread_info
*) entry
;
1201 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1202 struct process_info
*process
= proc
;
1204 if (pid_of (thread
) == pid_of (process
))
1211 linux_mourn (struct process_info
*process
)
1213 struct process_info_private
*priv
;
1215 #ifdef USE_THREAD_DB
1216 thread_db_mourn (process
);
1219 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1221 /* Freeing all private data. */
1222 priv
= process
->priv
;
1223 free (priv
->arch_private
);
1225 process
->priv
= NULL
;
1227 remove_process (process
);
1231 linux_join (int pid
)
1236 ret
= my_waitpid (pid
, &status
, 0);
1237 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1239 } while (ret
!= -1 || errno
!= ECHILD
);
1242 /* Return nonzero if the given thread is still alive. */
1244 linux_thread_alive (ptid_t ptid
)
1246 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1248 /* We assume we always know if a thread exits. If a whole process
1249 exited but we still haven't been able to report it to GDB, we'll
1250 hold on to the last lwp of the dead process. */
1257 /* Return 1 if this lwp still has an interesting status pending. If
1258 not (e.g., it had stopped for a breakpoint that is gone), return
1262 thread_still_has_status_pending_p (struct thread_info
*thread
)
1264 struct lwp_info
*lp
= get_thread_lwp (thread
);
1266 if (!lp
->status_pending_p
)
1269 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1270 report any status pending the LWP may have. */
1271 if (thread
->last_resume_kind
== resume_stop
1272 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1275 if (thread
->last_resume_kind
!= resume_stop
1276 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1277 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1279 struct thread_info
*saved_thread
;
1283 gdb_assert (lp
->last_status
!= 0);
1287 saved_thread
= current_thread
;
1288 current_thread
= thread
;
1290 if (pc
!= lp
->stop_pc
)
1293 debug_printf ("PC of %ld changed\n",
1298 #if !USE_SIGTRAP_SIGINFO
1299 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1300 && !(*the_low_target
.breakpoint_at
) (pc
))
1303 debug_printf ("previous SW breakpoint of %ld gone\n",
1307 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1308 && !hardware_breakpoint_inserted_here (pc
))
1311 debug_printf ("previous HW breakpoint of %ld gone\n",
1317 current_thread
= saved_thread
;
1322 debug_printf ("discarding pending breakpoint status\n");
1323 lp
->status_pending_p
= 0;
1331 /* Return 1 if this lwp has an interesting status pending. */
1333 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1335 struct thread_info
*thread
= (struct thread_info
*) entry
;
1336 struct lwp_info
*lp
= get_thread_lwp (thread
);
1337 ptid_t ptid
= * (ptid_t
*) arg
;
1339 /* Check if we're only interested in events from a specific process
1340 or a specific LWP. */
1341 if (!ptid_match (ptid_of (thread
), ptid
))
1344 if (lp
->status_pending_p
1345 && !thread_still_has_status_pending_p (thread
))
1347 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1351 return lp
->status_pending_p
;
1355 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1357 ptid_t ptid
= *(ptid_t
*) data
;
1360 if (ptid_get_lwp (ptid
) != 0)
1361 lwp
= ptid_get_lwp (ptid
);
1363 lwp
= ptid_get_pid (ptid
);
1365 if (ptid_get_lwp (entry
->id
) == lwp
)
1372 find_lwp_pid (ptid_t ptid
)
1374 struct inferior_list_entry
*thread
1375 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1380 return get_thread_lwp ((struct thread_info
*) thread
);
1383 /* Return the number of known LWPs in the tgid given by PID. */
1388 struct inferior_list_entry
*inf
, *tmp
;
1391 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1393 if (ptid_get_pid (inf
->id
) == pid
)
1400 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1401 their exits until all other threads in the group have exited. */
1404 check_zombie_leaders (void)
1406 struct process_info
*proc
, *tmp
;
1408 ALL_PROCESSES (proc
, tmp
)
1410 pid_t leader_pid
= pid_of (proc
);
1411 struct lwp_info
*leader_lp
;
1413 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1416 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1417 "num_lwps=%d, zombie=%d\n",
1418 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1419 linux_proc_pid_is_zombie (leader_pid
));
1421 if (leader_lp
!= NULL
1422 /* Check if there are other threads in the group, as we may
1423 have raced with the inferior simply exiting. */
1424 && !last_thread_of_process_p (leader_pid
)
1425 && linux_proc_pid_is_zombie (leader_pid
))
1427 /* A leader zombie can mean one of two things:
1429 - It exited, and there's an exit status pending
1430 available, or only the leader exited (not the whole
1431 program). In the latter case, we can't waitpid the
1432 leader's exit status until all other threads are gone.
1434 - There are 3 or more threads in the group, and a thread
1435 other than the leader exec'd. On an exec, the Linux
1436 kernel destroys all other threads (except the execing
1437 one) in the thread group, and resets the execing thread's
1438 tid to the tgid. No exit notification is sent for the
1439 execing thread -- from the ptracer's perspective, it
1440 appears as though the execing thread just vanishes.
1441 Until we reap all other threads except the leader and the
1442 execing thread, the leader will be zombie, and the
1443 execing thread will be in `D (disc sleep)'. As soon as
1444 all other threads are reaped, the execing thread changes
1445 it's tid to the tgid, and the previous (zombie) leader
1446 vanishes, giving place to the "new" leader. We could try
1447 distinguishing the exit and exec cases, by waiting once
1448 more, and seeing if something comes out, but it doesn't
1449 sound useful. The previous leader _does_ go away, and
1450 we'll re-add the new one once we see the exec event
1451 (which is just the same as what would happen if the
1452 previous leader did exit voluntarily before some other
1457 "CZL: Thread group leader %d zombie "
1458 "(it exited, or another thread execd).\n",
1461 delete_lwp (leader_lp
);
1466 /* Callback for `find_inferior'. Returns the first LWP that is not
1467 stopped. ARG is a PTID filter. */
1470 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1472 struct thread_info
*thr
= (struct thread_info
*) entry
;
1473 struct lwp_info
*lwp
;
1474 ptid_t filter
= *(ptid_t
*) arg
;
1476 if (!ptid_match (ptid_of (thr
), filter
))
1479 lwp
= get_thread_lwp (thr
);
1486 /* This function should only be called if the LWP got a SIGTRAP.
1488 Handle any tracepoint steps or hits. Return true if a tracepoint
1489 event was handled, 0 otherwise. */
1492 handle_tracepoints (struct lwp_info
*lwp
)
1494 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1495 int tpoint_related_event
= 0;
1497 gdb_assert (lwp
->suspended
== 0);
1499 /* If this tracepoint hit causes a tracing stop, we'll immediately
1500 uninsert tracepoints. To do this, we temporarily pause all
1501 threads, unpatch away, and then unpause threads. We need to make
1502 sure the unpausing doesn't resume LWP too. */
1505 /* And we need to be sure that any all-threads-stopping doesn't try
1506 to move threads out of the jump pads, as it could deadlock the
1507 inferior (LWP could be in the jump pad, maybe even holding the
1510 /* Do any necessary step collect actions. */
1511 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1513 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1515 /* See if we just hit a tracepoint and do its main collect
1517 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1521 gdb_assert (lwp
->suspended
== 0);
1522 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1524 if (tpoint_related_event
)
1527 debug_printf ("got a tracepoint event\n");
1534 /* Convenience wrapper. Returns true if LWP is presently collecting a
1538 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1539 struct fast_tpoint_collect_status
*status
)
1541 CORE_ADDR thread_area
;
1542 struct thread_info
*thread
= get_lwp_thread (lwp
);
1544 if (the_low_target
.get_thread_area
== NULL
)
1547 /* Get the thread area address. This is used to recognize which
1548 thread is which when tracing with the in-process agent library.
1549 We don't read anything from the address, and treat it as opaque;
1550 it's the address itself that we assume is unique per-thread. */
1551 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1554 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1557 /* The reason we resume in the caller, is because we want to be able
1558 to pass lwp->status_pending as WSTAT, and we need to clear
1559 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1560 refuses to resume. */
1563 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1565 struct thread_info
*saved_thread
;
1567 saved_thread
= current_thread
;
1568 current_thread
= get_lwp_thread (lwp
);
1571 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1572 && supports_fast_tracepoints ()
1573 && agent_loaded_p ())
1575 struct fast_tpoint_collect_status status
;
1579 debug_printf ("Checking whether LWP %ld needs to move out of the "
1581 lwpid_of (current_thread
));
1583 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1586 || (WSTOPSIG (*wstat
) != SIGILL
1587 && WSTOPSIG (*wstat
) != SIGFPE
1588 && WSTOPSIG (*wstat
) != SIGSEGV
1589 && WSTOPSIG (*wstat
) != SIGBUS
))
1591 lwp
->collecting_fast_tracepoint
= r
;
1595 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1597 /* Haven't executed the original instruction yet.
1598 Set breakpoint there, and wait till it's hit,
1599 then single-step until exiting the jump pad. */
1600 lwp
->exit_jump_pad_bkpt
1601 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1605 debug_printf ("Checking whether LWP %ld needs to move out of "
1606 "the jump pad...it does\n",
1607 lwpid_of (current_thread
));
1608 current_thread
= saved_thread
;
1615 /* If we get a synchronous signal while collecting, *and*
1616 while executing the (relocated) original instruction,
1617 reset the PC to point at the tpoint address, before
1618 reporting to GDB. Otherwise, it's an IPA lib bug: just
1619 report the signal to GDB, and pray for the best. */
1621 lwp
->collecting_fast_tracepoint
= 0;
1624 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1625 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1628 struct regcache
*regcache
;
1630 /* The si_addr on a few signals references the address
1631 of the faulting instruction. Adjust that as
1633 if ((WSTOPSIG (*wstat
) == SIGILL
1634 || WSTOPSIG (*wstat
) == SIGFPE
1635 || WSTOPSIG (*wstat
) == SIGBUS
1636 || WSTOPSIG (*wstat
) == SIGSEGV
)
1637 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1638 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1639 /* Final check just to make sure we don't clobber
1640 the siginfo of non-kernel-sent signals. */
1641 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1643 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1644 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1645 (PTRACE_TYPE_ARG3
) 0, &info
);
1648 regcache
= get_thread_regcache (current_thread
, 1);
1649 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1650 lwp
->stop_pc
= status
.tpoint_addr
;
1652 /* Cancel any fast tracepoint lock this thread was
1654 force_unlock_trace_buffer ();
1657 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1660 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1661 "stopping all threads momentarily.\n");
1663 stop_all_lwps (1, lwp
);
1665 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1666 lwp
->exit_jump_pad_bkpt
= NULL
;
1668 unstop_all_lwps (1, lwp
);
1670 gdb_assert (lwp
->suspended
>= 0);
1676 debug_printf ("Checking whether LWP %ld needs to move out of the "
1678 lwpid_of (current_thread
));
1680 current_thread
= saved_thread
;
1684 /* Enqueue one signal in the "signals to report later when out of the
1688 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1690 struct pending_signals
*p_sig
;
1691 struct thread_info
*thread
= get_lwp_thread (lwp
);
1694 debug_printf ("Deferring signal %d for LWP %ld.\n",
1695 WSTOPSIG (*wstat
), lwpid_of (thread
));
1699 struct pending_signals
*sig
;
1701 for (sig
= lwp
->pending_signals_to_report
;
1704 debug_printf (" Already queued %d\n",
1707 debug_printf (" (no more currently queued signals)\n");
1710 /* Don't enqueue non-RT signals if they are already in the deferred
1711 queue. (SIGSTOP being the easiest signal to see ending up here
1713 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1715 struct pending_signals
*sig
;
1717 for (sig
= lwp
->pending_signals_to_report
;
1721 if (sig
->signal
== WSTOPSIG (*wstat
))
1724 debug_printf ("Not requeuing already queued non-RT signal %d"
1733 p_sig
= xmalloc (sizeof (*p_sig
));
1734 p_sig
->prev
= lwp
->pending_signals_to_report
;
1735 p_sig
->signal
= WSTOPSIG (*wstat
);
1736 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1737 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1740 lwp
->pending_signals_to_report
= p_sig
;
1743 /* Dequeue one signal from the "signals to report later when out of
1744 the jump pad" list. */
1747 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1749 struct thread_info
*thread
= get_lwp_thread (lwp
);
1751 if (lwp
->pending_signals_to_report
!= NULL
)
1753 struct pending_signals
**p_sig
;
1755 p_sig
= &lwp
->pending_signals_to_report
;
1756 while ((*p_sig
)->prev
!= NULL
)
1757 p_sig
= &(*p_sig
)->prev
;
1759 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1760 if ((*p_sig
)->info
.si_signo
!= 0)
1761 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1767 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1768 WSTOPSIG (*wstat
), lwpid_of (thread
));
1772 struct pending_signals
*sig
;
1774 for (sig
= lwp
->pending_signals_to_report
;
1777 debug_printf (" Still queued %d\n",
1780 debug_printf (" (no more queued signals)\n");
1789 /* Fetch the possibly triggered data watchpoint info and store it in
1792 On some archs, like x86, that use debug registers to set
1793 watchpoints, it's possible that the way to know which watched
1794 address trapped, is to check the register that is used to select
1795 which address to watch. Problem is, between setting the watchpoint
1796 and reading back which data address trapped, the user may change
1797 the set of watchpoints, and, as a consequence, GDB changes the
1798 debug registers in the inferior. To avoid reading back a stale
1799 stopped-data-address when that happens, we cache in LP the fact
1800 that a watchpoint trapped, and the corresponding data address, as
1801 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1802 registers meanwhile, we have the cached data we can rely on. */
1805 check_stopped_by_watchpoint (struct lwp_info
*child
)
1807 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1809 struct thread_info
*saved_thread
;
1811 saved_thread
= current_thread
;
1812 current_thread
= get_lwp_thread (child
);
1814 if (the_low_target
.stopped_by_watchpoint ())
1816 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
1818 if (the_low_target
.stopped_data_address
!= NULL
)
1819 child
->stopped_data_address
1820 = the_low_target
.stopped_data_address ();
1822 child
->stopped_data_address
= 0;
1825 current_thread
= saved_thread
;
1828 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
1831 /* Do low-level handling of the event, and check if we should go on
1832 and pass it to caller code. Return the affected lwp if we are, or
1835 static struct lwp_info
*
1836 linux_low_filter_event (int lwpid
, int wstat
)
1838 struct lwp_info
*child
;
1839 struct thread_info
*thread
;
1840 int have_stop_pc
= 0;
1842 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1844 /* If we didn't find a process, one of two things presumably happened:
1845 - A process we started and then detached from has exited. Ignore it.
1846 - A process we are controlling has forked and the new child's stop
1847 was reported to us by the kernel. Save its PID. */
1848 if (child
== NULL
&& WIFSTOPPED (wstat
))
1850 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1853 else if (child
== NULL
)
1856 thread
= get_lwp_thread (child
);
1860 child
->last_status
= wstat
;
1862 /* Check if the thread has exited. */
1863 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1866 debug_printf ("LLFE: %d exited.\n", lwpid
);
1867 if (num_lwps (pid_of (thread
)) > 1)
1870 /* If there is at least one more LWP, then the exit signal was
1871 not the end of the debugged application and should be
1878 /* This was the last lwp in the process. Since events are
1879 serialized to GDB core, and we can't report this one
1880 right now, but GDB core and the other target layers will
1881 want to be notified about the exit code/signal, leave the
1882 status pending for the next time we're able to report
1884 mark_lwp_dead (child
, wstat
);
1889 gdb_assert (WIFSTOPPED (wstat
));
1891 if (WIFSTOPPED (wstat
))
1893 struct process_info
*proc
;
1895 /* Architecture-specific setup after inferior is running. This
1896 needs to happen after we have attached to the inferior and it
1897 is stopped for the first time, but before we access any
1898 inferior registers. */
1899 proc
= find_process_pid (pid_of (thread
));
1900 if (proc
->priv
->new_inferior
)
1902 struct thread_info
*saved_thread
;
1904 saved_thread
= current_thread
;
1905 current_thread
= thread
;
1907 the_low_target
.arch_setup ();
1909 current_thread
= saved_thread
;
1911 proc
->priv
->new_inferior
= 0;
1915 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1917 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1919 linux_enable_event_reporting (lwpid
, proc
->attached
);
1920 child
->must_set_ptrace_flags
= 0;
1923 /* Be careful to not overwrite stop_pc until
1924 check_stopped_by_breakpoint is called. */
1925 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1926 && linux_is_extended_waitstatus (wstat
))
1928 child
->stop_pc
= get_pc (child
);
1929 handle_extended_wait (child
, wstat
);
1933 /* Check first whether this was a SW/HW breakpoint before checking
1934 watchpoints, because at least s390 can't tell the data address of
1935 hardware watchpoint hits, and returns stopped-by-watchpoint as
1936 long as there's a watchpoint set. */
1937 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
1939 if (check_stopped_by_breakpoint (child
))
1943 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
1944 or hardware watchpoint. Check which is which if we got
1945 TARGET_STOPPED_BY_HW_BREAKPOINT. */
1946 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1947 && (child
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
1948 || child
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1949 check_stopped_by_watchpoint (child
);
1952 child
->stop_pc
= get_pc (child
);
1954 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1955 && child
->stop_expected
)
1958 debug_printf ("Expected stop.\n");
1959 child
->stop_expected
= 0;
1961 if (thread
->last_resume_kind
== resume_stop
)
1963 /* We want to report the stop to the core. Treat the
1964 SIGSTOP as a normal event. */
1966 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1968 /* Stopping threads. We don't want this SIGSTOP to end up
1974 /* Filter out the event. */
1975 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1980 child
->status_pending_p
= 1;
1981 child
->status_pending
= wstat
;
1985 /* Resume LWPs that are currently stopped without any pending status
1986 to report, but are resumed from the core's perspective. */
1989 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
1991 struct thread_info
*thread
= (struct thread_info
*) entry
;
1992 struct lwp_info
*lp
= get_thread_lwp (thread
);
1995 && !lp
->status_pending_p
1996 && thread
->last_resume_kind
!= resume_stop
1997 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1999 int step
= thread
->last_resume_kind
== resume_step
;
2002 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2003 target_pid_to_str (ptid_of (thread
)),
2004 paddress (lp
->stop_pc
),
2007 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2011 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2012 match FILTER_PTID (leaving others pending). The PTIDs can be:
2013 minus_one_ptid, to specify any child; a pid PTID, specifying all
2014 lwps of a thread group; or a PTID representing a single lwp. Store
2015 the stop status through the status pointer WSTAT. OPTIONS is
2016 passed to the waitpid call. Return 0 if no event was found and
2017 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2018 was found. Return the PID of the stopped child otherwise. */
2021 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2022 int *wstatp
, int options
)
2024 struct thread_info
*event_thread
;
2025 struct lwp_info
*event_child
, *requested_child
;
2026 sigset_t block_mask
, prev_mask
;
2029 /* N.B. event_thread points to the thread_info struct that contains
2030 event_child. Keep them in sync. */
2031 event_thread
= NULL
;
2033 requested_child
= NULL
;
2035 /* Check for a lwp with a pending status. */
2037 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2039 event_thread
= (struct thread_info
*)
2040 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2041 if (event_thread
!= NULL
)
2042 event_child
= get_thread_lwp (event_thread
);
2043 if (debug_threads
&& event_thread
)
2044 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2046 else if (!ptid_equal (filter_ptid
, null_ptid
))
2048 requested_child
= find_lwp_pid (filter_ptid
);
2050 if (stopping_threads
== NOT_STOPPING_THREADS
2051 && requested_child
->status_pending_p
2052 && requested_child
->collecting_fast_tracepoint
)
2054 enqueue_one_deferred_signal (requested_child
,
2055 &requested_child
->status_pending
);
2056 requested_child
->status_pending_p
= 0;
2057 requested_child
->status_pending
= 0;
2058 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2061 if (requested_child
->suspended
2062 && requested_child
->status_pending_p
)
2064 internal_error (__FILE__
, __LINE__
,
2065 "requesting an event out of a"
2066 " suspended child?");
2069 if (requested_child
->status_pending_p
)
2071 event_child
= requested_child
;
2072 event_thread
= get_lwp_thread (event_child
);
2076 if (event_child
!= NULL
)
2079 debug_printf ("Got an event from pending child %ld (%04x)\n",
2080 lwpid_of (event_thread
), event_child
->status_pending
);
2081 *wstatp
= event_child
->status_pending
;
2082 event_child
->status_pending_p
= 0;
2083 event_child
->status_pending
= 0;
2084 current_thread
= event_thread
;
2085 return lwpid_of (event_thread
);
2088 /* But if we don't find a pending event, we'll have to wait.
2090 We only enter this loop if no process has a pending wait status.
2091 Thus any action taken in response to a wait status inside this
2092 loop is responding as soon as we detect the status, not after any
2095 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2096 all signals while here. */
2097 sigfillset (&block_mask
);
2098 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2100 /* Always pull all events out of the kernel. We'll randomly select
2101 an event LWP out of all that have events, to prevent
2103 while (event_child
== NULL
)
2107 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2110 - If the thread group leader exits while other threads in the
2111 thread group still exist, waitpid(TGID, ...) hangs. That
2112 waitpid won't return an exit status until the other threads
2113 in the group are reaped.
2115 - When a non-leader thread execs, that thread just vanishes
2116 without reporting an exit (so we'd hang if we waited for it
2117 explicitly in that case). The exec event is reported to
2118 the TGID pid (although we don't currently enable exec
2121 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2124 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2125 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2131 debug_printf ("LLW: waitpid %ld received %s\n",
2132 (long) ret
, status_to_str (*wstatp
));
2135 /* Filter all events. IOW, leave all events pending. We'll
2136 randomly select an event LWP out of all that have events
2138 linux_low_filter_event (ret
, *wstatp
);
2139 /* Retry until nothing comes out of waitpid. A single
2140 SIGCHLD can indicate more than one child stopped. */
2144 /* Now that we've pulled all events out of the kernel, resume
2145 LWPs that don't have an interesting event to report. */
2146 if (stopping_threads
== NOT_STOPPING_THREADS
)
2147 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2149 /* ... and find an LWP with a status to report to the core, if
2151 event_thread
= (struct thread_info
*)
2152 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2153 if (event_thread
!= NULL
)
2155 event_child
= get_thread_lwp (event_thread
);
2156 *wstatp
= event_child
->status_pending
;
2157 event_child
->status_pending_p
= 0;
2158 event_child
->status_pending
= 0;
2162 /* Check for zombie thread group leaders. Those can't be reaped
2163 until all other threads in the thread group are. */
2164 check_zombie_leaders ();
2166 /* If there are no resumed children left in the set of LWPs we
2167 want to wait for, bail. We can't just block in
2168 waitpid/sigsuspend, because lwps might have been left stopped
2169 in trace-stop state, and we'd be stuck forever waiting for
2170 their status to change (which would only happen if we resumed
2171 them). Even if WNOHANG is set, this return code is preferred
2172 over 0 (below), as it is more detailed. */
2173 if ((find_inferior (&all_threads
,
2174 not_stopped_callback
,
2175 &wait_ptid
) == NULL
))
2178 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2179 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2183 /* No interesting event to report to the caller. */
2184 if ((options
& WNOHANG
))
2187 debug_printf ("WNOHANG set, no event found\n");
2189 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2193 /* Block until we get an event reported with SIGCHLD. */
2195 debug_printf ("sigsuspend'ing\n");
2197 sigsuspend (&prev_mask
);
2198 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2202 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2204 current_thread
= event_thread
;
2206 /* Check for thread exit. */
2207 if (! WIFSTOPPED (*wstatp
))
2209 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2212 debug_printf ("LWP %d is the last lwp of process. "
2213 "Process %ld exiting.\n",
2214 pid_of (event_thread
), lwpid_of (event_thread
));
2215 return lwpid_of (event_thread
);
2218 return lwpid_of (event_thread
);
2221 /* Wait for an event from child(ren) PTID. PTIDs can be:
2222 minus_one_ptid, to specify any child; a pid PTID, specifying all
2223 lwps of a thread group; or a PTID representing a single lwp. Store
2224 the stop status through the status pointer WSTAT. OPTIONS is
2225 passed to the waitpid call. Return 0 if no event was found and
2226 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2227 was found. Return the PID of the stopped child otherwise. */
2230 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2232 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2235 /* Count the LWP's that have had events. */
2238 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2240 struct thread_info
*thread
= (struct thread_info
*) entry
;
2241 struct lwp_info
*lp
= get_thread_lwp (thread
);
2244 gdb_assert (count
!= NULL
);
2246 /* Count only resumed LWPs that have an event pending. */
2247 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2248 && thread
->last_resume_kind
!= resume_stop
2249 && lp
->status_pending_p
)
2255 /* Select the LWP (if any) that is currently being single-stepped. */
2258 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2260 struct thread_info
*thread
= (struct thread_info
*) entry
;
2261 struct lwp_info
*lp
= get_thread_lwp (thread
);
2263 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2264 && thread
->last_resume_kind
== resume_step
2265 && lp
->status_pending_p
)
2271 /* Select the Nth LWP that has had an event. */
2274 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2276 struct thread_info
*thread
= (struct thread_info
*) entry
;
2277 struct lwp_info
*lp
= get_thread_lwp (thread
);
2278 int *selector
= data
;
2280 gdb_assert (selector
!= NULL
);
2282 /* Select only resumed LWPs that have an event pending. */
2283 if (thread
->last_resume_kind
!= resume_stop
2284 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2285 && lp
->status_pending_p
)
2286 if ((*selector
)-- == 0)
2292 /* Select one LWP out of those that have events pending. */
2295 select_event_lwp (struct lwp_info
**orig_lp
)
2298 int random_selector
;
2299 struct thread_info
*event_thread
= NULL
;
2301 /* In all-stop, give preference to the LWP that is being
2302 single-stepped. There will be at most one, and it's the LWP that
2303 the core is most interested in. If we didn't do this, then we'd
2304 have to handle pending step SIGTRAPs somehow in case the core
2305 later continues the previously-stepped thread, otherwise we'd
2306 report the pending SIGTRAP, and the core, not having stepped the
2307 thread, wouldn't understand what the trap was for, and therefore
2308 would report it to the user as a random signal. */
2312 = (struct thread_info
*) find_inferior (&all_threads
,
2313 select_singlestep_lwp_callback
,
2315 if (event_thread
!= NULL
)
2318 debug_printf ("SEL: Select single-step %s\n",
2319 target_pid_to_str (ptid_of (event_thread
)));
2322 if (event_thread
== NULL
)
2324 /* No single-stepping LWP. Select one at random, out of those
2325 which have had events. */
2327 /* First see how many events we have. */
2328 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2329 gdb_assert (num_events
> 0);
2331 /* Now randomly pick a LWP out of those that have had
2333 random_selector
= (int)
2334 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2336 if (debug_threads
&& num_events
> 1)
2337 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2338 num_events
, random_selector
);
2341 = (struct thread_info
*) find_inferior (&all_threads
,
2342 select_event_lwp_callback
,
2346 if (event_thread
!= NULL
)
2348 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2350 /* Switch the event LWP. */
2351 *orig_lp
= event_lp
;
2355 /* Decrement the suspend count of an LWP. */
2358 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2360 struct thread_info
*thread
= (struct thread_info
*) entry
;
2361 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2363 /* Ignore EXCEPT. */
2369 gdb_assert (lwp
->suspended
>= 0);
2373 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2377 unsuspend_all_lwps (struct lwp_info
*except
)
2379 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2382 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2383 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2385 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2386 static ptid_t
linux_wait_1 (ptid_t ptid
,
2387 struct target_waitstatus
*ourstatus
,
2388 int target_options
);
2390 /* Stabilize threads (move out of jump pads).
2392 If a thread is midway collecting a fast tracepoint, we need to
2393 finish the collection and move it out of the jump pad before
2394 reporting the signal.
2396 This avoids recursion while collecting (when a signal arrives
2397 midway, and the signal handler itself collects), which would trash
2398 the trace buffer. In case the user set a breakpoint in a signal
2399 handler, this avoids the backtrace showing the jump pad, etc..
2400 Most importantly, there are certain things we can't do safely if
2401 threads are stopped in a jump pad (or in its callee's). For
2404 - starting a new trace run. A thread still collecting the
2405 previous run, could trash the trace buffer when resumed. The trace
2406 buffer control structures would have been reset but the thread had
2407 no way to tell. The thread could even midway memcpy'ing to the
2408 buffer, which would mean that when resumed, it would clobber the
2409 trace buffer that had been set for a new run.
2411 - we can't rewrite/reuse the jump pads for new tracepoints
2412 safely. Say you do tstart while a thread is stopped midway while
2413 collecting. When the thread is later resumed, it finishes the
2414 collection, and returns to the jump pad, to execute the original
2415 instruction that was under the tracepoint jump at the time the
2416 older run had been started. If the jump pad had been rewritten
2417 since for something else in the new run, the thread would now
2418 execute the wrong / random instructions. */
2421 linux_stabilize_threads (void)
2423 struct thread_info
*saved_thread
;
2424 struct thread_info
*thread_stuck
;
2427 = (struct thread_info
*) find_inferior (&all_threads
,
2428 stuck_in_jump_pad_callback
,
2430 if (thread_stuck
!= NULL
)
2433 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2434 lwpid_of (thread_stuck
));
2438 saved_thread
= current_thread
;
2440 stabilizing_threads
= 1;
2443 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2445 /* Loop until all are stopped out of the jump pads. */
2446 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2448 struct target_waitstatus ourstatus
;
2449 struct lwp_info
*lwp
;
2452 /* Note that we go through the full wait even loop. While
2453 moving threads out of jump pad, we need to be able to step
2454 over internal breakpoints and such. */
2455 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2457 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2459 lwp
= get_thread_lwp (current_thread
);
2464 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2465 || current_thread
->last_resume_kind
== resume_stop
)
2467 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2468 enqueue_one_deferred_signal (lwp
, &wstat
);
2473 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2475 stabilizing_threads
= 0;
2477 current_thread
= saved_thread
;
2482 = (struct thread_info
*) find_inferior (&all_threads
,
2483 stuck_in_jump_pad_callback
,
2485 if (thread_stuck
!= NULL
)
2486 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2487 lwpid_of (thread_stuck
));
2491 static void async_file_mark (void);
2493 /* Convenience function that is called when the kernel reports an
2494 event that is not passed out to GDB. */
2497 ignore_event (struct target_waitstatus
*ourstatus
)
2499 /* If we got an event, there may still be others, as a single
2500 SIGCHLD can indicate more than one child stopped. This forces
2501 another target_wait call. */
2504 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2508 /* Wait for process, returns status. */
2511 linux_wait_1 (ptid_t ptid
,
2512 struct target_waitstatus
*ourstatus
, int target_options
)
2515 struct lwp_info
*event_child
;
2518 int step_over_finished
;
2519 int bp_explains_trap
;
2520 int maybe_internal_trap
;
2528 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2531 /* Translate generic target options into linux options. */
2533 if (target_options
& TARGET_WNOHANG
)
2536 bp_explains_trap
= 0;
2539 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2541 if (ptid_equal (step_over_bkpt
, null_ptid
))
2542 pid
= linux_wait_for_event (ptid
, &w
, options
);
2546 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2547 target_pid_to_str (step_over_bkpt
));
2548 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2553 gdb_assert (target_options
& TARGET_WNOHANG
);
2557 debug_printf ("linux_wait_1 ret = null_ptid, "
2558 "TARGET_WAITKIND_IGNORE\n");
2562 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2569 debug_printf ("linux_wait_1 ret = null_ptid, "
2570 "TARGET_WAITKIND_NO_RESUMED\n");
2574 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2578 event_child
= get_thread_lwp (current_thread
);
2580 /* linux_wait_for_event only returns an exit status for the last
2581 child of a process. Report it. */
2582 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2586 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2587 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2591 debug_printf ("linux_wait_1 ret = %s, exited with "
2593 target_pid_to_str (ptid_of (current_thread
)),
2600 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2601 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2605 debug_printf ("linux_wait_1 ret = %s, terminated with "
2607 target_pid_to_str (ptid_of (current_thread
)),
2613 return ptid_of (current_thread
);
2616 /* If step-over executes a breakpoint instruction, it means a
2617 gdb/gdbserver breakpoint had been planted on top of a permanent
2618 breakpoint. The PC has been adjusted by
2619 check_stopped_by_breakpoint to point at the breakpoint address.
2620 Advance the PC manually past the breakpoint, otherwise the
2621 program would keep trapping the permanent breakpoint forever. */
2622 if (!ptid_equal (step_over_bkpt
, null_ptid
)
2623 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
2625 unsigned int increment_pc
= the_low_target
.breakpoint_len
;
2629 debug_printf ("step-over for %s executed software breakpoint\n",
2630 target_pid_to_str (ptid_of (current_thread
)));
2633 if (increment_pc
!= 0)
2635 struct regcache
*regcache
2636 = get_thread_regcache (current_thread
, 1);
2638 event_child
->stop_pc
+= increment_pc
;
2639 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2641 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
2642 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
2646 /* If this event was not handled before, and is not a SIGTRAP, we
2647 report it. SIGILL and SIGSEGV are also treated as traps in case
2648 a breakpoint is inserted at the current PC. If this target does
2649 not support internal breakpoints at all, we also report the
2650 SIGTRAP without further processing; it's of no concern to us. */
2652 = (supports_breakpoints ()
2653 && (WSTOPSIG (w
) == SIGTRAP
2654 || ((WSTOPSIG (w
) == SIGILL
2655 || WSTOPSIG (w
) == SIGSEGV
)
2656 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2658 if (maybe_internal_trap
)
2660 /* Handle anything that requires bookkeeping before deciding to
2661 report the event or continue waiting. */
2663 /* First check if we can explain the SIGTRAP with an internal
2664 breakpoint, or if we should possibly report the event to GDB.
2665 Do this before anything that may remove or insert a
2667 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2669 /* We have a SIGTRAP, possibly a step-over dance has just
2670 finished. If so, tweak the state machine accordingly,
2671 reinsert breakpoints and delete any reinsert (software
2672 single-step) breakpoints. */
2673 step_over_finished
= finish_step_over (event_child
);
2675 /* Now invoke the callbacks of any internal breakpoints there. */
2676 check_breakpoints (event_child
->stop_pc
);
2678 /* Handle tracepoint data collecting. This may overflow the
2679 trace buffer, and cause a tracing stop, removing
2681 trace_event
= handle_tracepoints (event_child
);
2683 if (bp_explains_trap
)
2685 /* If we stepped or ran into an internal breakpoint, we've
2686 already handled it. So next time we resume (from this
2687 PC), we should step over it. */
2689 debug_printf ("Hit a gdbserver breakpoint.\n");
2691 if (breakpoint_here (event_child
->stop_pc
))
2692 event_child
->need_step_over
= 1;
2697 /* We have some other signal, possibly a step-over dance was in
2698 progress, and it should be cancelled too. */
2699 step_over_finished
= finish_step_over (event_child
);
2702 /* We have all the data we need. Either report the event to GDB, or
2703 resume threads and keep waiting for more. */
2705 /* If we're collecting a fast tracepoint, finish the collection and
2706 move out of the jump pad before delivering a signal. See
2707 linux_stabilize_threads. */
2710 && WSTOPSIG (w
) != SIGTRAP
2711 && supports_fast_tracepoints ()
2712 && agent_loaded_p ())
2715 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2716 "to defer or adjust it.\n",
2717 WSTOPSIG (w
), lwpid_of (current_thread
));
2719 /* Allow debugging the jump pad itself. */
2720 if (current_thread
->last_resume_kind
!= resume_step
2721 && maybe_move_out_of_jump_pad (event_child
, &w
))
2723 enqueue_one_deferred_signal (event_child
, &w
);
2726 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2727 WSTOPSIG (w
), lwpid_of (current_thread
));
2729 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2731 return ignore_event (ourstatus
);
2735 if (event_child
->collecting_fast_tracepoint
)
2738 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2739 "Check if we're already there.\n",
2740 lwpid_of (current_thread
),
2741 event_child
->collecting_fast_tracepoint
);
2745 event_child
->collecting_fast_tracepoint
2746 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2748 if (event_child
->collecting_fast_tracepoint
!= 1)
2750 /* No longer need this breakpoint. */
2751 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2754 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2755 "stopping all threads momentarily.\n");
2757 /* Other running threads could hit this breakpoint.
2758 We don't handle moribund locations like GDB does,
2759 instead we always pause all threads when removing
2760 breakpoints, so that any step-over or
2761 decr_pc_after_break adjustment is always taken
2762 care of while the breakpoint is still
2764 stop_all_lwps (1, event_child
);
2766 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2767 event_child
->exit_jump_pad_bkpt
= NULL
;
2769 unstop_all_lwps (1, event_child
);
2771 gdb_assert (event_child
->suspended
>= 0);
2775 if (event_child
->collecting_fast_tracepoint
== 0)
2778 debug_printf ("fast tracepoint finished "
2779 "collecting successfully.\n");
2781 /* We may have a deferred signal to report. */
2782 if (dequeue_one_deferred_signal (event_child
, &w
))
2785 debug_printf ("dequeued one signal.\n");
2790 debug_printf ("no deferred signals.\n");
2792 if (stabilizing_threads
)
2794 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2795 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2799 debug_printf ("linux_wait_1 ret = %s, stopped "
2800 "while stabilizing threads\n",
2801 target_pid_to_str (ptid_of (current_thread
)));
2805 return ptid_of (current_thread
);
2811 /* Check whether GDB would be interested in this event. */
2813 /* If GDB is not interested in this signal, don't stop other
2814 threads, and don't report it to GDB. Just resume the inferior
2815 right away. We do this for threading-related signals as well as
2816 any that GDB specifically requested we ignore. But never ignore
2817 SIGSTOP if we sent it ourselves, and do not ignore signals when
2818 stepping - they may require special handling to skip the signal
2819 handler. Also never ignore signals that could be caused by a
2821 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2824 && current_thread
->last_resume_kind
!= resume_step
2826 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2827 (current_process ()->priv
->thread_db
!= NULL
2828 && (WSTOPSIG (w
) == __SIGRTMIN
2829 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2832 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2833 && !(WSTOPSIG (w
) == SIGSTOP
2834 && current_thread
->last_resume_kind
== resume_stop
)
2835 && !linux_wstatus_maybe_breakpoint (w
))))
2837 siginfo_t info
, *info_p
;
2840 debug_printf ("Ignored signal %d for LWP %ld.\n",
2841 WSTOPSIG (w
), lwpid_of (current_thread
));
2843 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2844 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2848 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2849 WSTOPSIG (w
), info_p
);
2850 return ignore_event (ourstatus
);
2853 /* Note that all addresses are always "out of the step range" when
2854 there's no range to begin with. */
2855 in_step_range
= lwp_in_step_range (event_child
);
2857 /* If GDB wanted this thread to single step, and the thread is out
2858 of the step range, we always want to report the SIGTRAP, and let
2859 GDB handle it. Watchpoints should always be reported. So should
2860 signals we can't explain. A SIGTRAP we can't explain could be a
2861 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2862 do, we're be able to handle GDB breakpoints on top of internal
2863 breakpoints, by handling the internal breakpoint and still
2864 reporting the event to GDB. If we don't, we're out of luck, GDB
2865 won't see the breakpoint hit. */
2866 report_to_gdb
= (!maybe_internal_trap
2867 || (current_thread
->last_resume_kind
== resume_step
2869 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
2870 || (!step_over_finished
&& !in_step_range
2871 && !bp_explains_trap
&& !trace_event
)
2872 || (gdb_breakpoint_here (event_child
->stop_pc
)
2873 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2874 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2876 run_breakpoint_commands (event_child
->stop_pc
);
2878 /* We found no reason GDB would want us to stop. We either hit one
2879 of our own breakpoints, or finished an internal step GDB
2880 shouldn't know about. */
2885 if (bp_explains_trap
)
2886 debug_printf ("Hit a gdbserver breakpoint.\n");
2887 if (step_over_finished
)
2888 debug_printf ("Step-over finished.\n");
2890 debug_printf ("Tracepoint event.\n");
2891 if (lwp_in_step_range (event_child
))
2892 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2893 paddress (event_child
->stop_pc
),
2894 paddress (event_child
->step_range_start
),
2895 paddress (event_child
->step_range_end
));
2898 /* We're not reporting this breakpoint to GDB, so apply the
2899 decr_pc_after_break adjustment to the inferior's regcache
2902 if (the_low_target
.set_pc
!= NULL
)
2904 struct regcache
*regcache
2905 = get_thread_regcache (current_thread
, 1);
2906 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2909 /* We may have finished stepping over a breakpoint. If so,
2910 we've stopped and suspended all LWPs momentarily except the
2911 stepping one. This is where we resume them all again. We're
2912 going to keep waiting, so use proceed, which handles stepping
2913 over the next breakpoint. */
2915 debug_printf ("proceeding all threads.\n");
2917 if (step_over_finished
)
2918 unsuspend_all_lwps (event_child
);
2920 proceed_all_lwps ();
2921 return ignore_event (ourstatus
);
2926 if (current_thread
->last_resume_kind
== resume_step
)
2928 if (event_child
->step_range_start
== event_child
->step_range_end
)
2929 debug_printf ("GDB wanted to single-step, reporting event.\n");
2930 else if (!lwp_in_step_range (event_child
))
2931 debug_printf ("Out of step range, reporting event.\n");
2933 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
2934 debug_printf ("Stopped by watchpoint.\n");
2935 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2936 debug_printf ("Stopped by GDB breakpoint.\n");
2938 debug_printf ("Hit a non-gdbserver trap event.\n");
2941 /* Alright, we're going to report a stop. */
2943 if (!stabilizing_threads
)
2945 /* In all-stop, stop all threads. */
2947 stop_all_lwps (0, NULL
);
2949 /* If we're not waiting for a specific LWP, choose an event LWP
2950 from among those that have had events. Giving equal priority
2951 to all LWPs that have had events helps prevent
2953 if (ptid_equal (ptid
, minus_one_ptid
))
2955 event_child
->status_pending_p
= 1;
2956 event_child
->status_pending
= w
;
2958 select_event_lwp (&event_child
);
2960 /* current_thread and event_child must stay in sync. */
2961 current_thread
= get_lwp_thread (event_child
);
2963 event_child
->status_pending_p
= 0;
2964 w
= event_child
->status_pending
;
2967 if (step_over_finished
)
2971 /* If we were doing a step-over, all other threads but
2972 the stepping one had been paused in start_step_over,
2973 with their suspend counts incremented. We don't want
2974 to do a full unstop/unpause, because we're in
2975 all-stop mode (so we want threads stopped), but we
2976 still need to unsuspend the other threads, to
2977 decrement their `suspended' count back. */
2978 unsuspend_all_lwps (event_child
);
2982 /* If we just finished a step-over, then all threads had
2983 been momentarily paused. In all-stop, that's fine,
2984 we want threads stopped by now anyway. In non-stop,
2985 we need to re-resume threads that GDB wanted to be
2987 unstop_all_lwps (1, event_child
);
2991 /* Stabilize threads (move out of jump pads). */
2993 stabilize_threads ();
2997 /* If we just finished a step-over, then all threads had been
2998 momentarily paused. In all-stop, that's fine, we want
2999 threads stopped by now anyway. In non-stop, we need to
3000 re-resume threads that GDB wanted to be running. */
3001 if (step_over_finished
)
3002 unstop_all_lwps (1, event_child
);
3005 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3007 /* Now that we've selected our final event LWP, un-adjust its PC if
3008 it was a software breakpoint, and the client doesn't know we can
3009 adjust the breakpoint ourselves. */
3010 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3011 && !swbreak_feature
)
3013 int decr_pc
= the_low_target
.decr_pc_after_break
;
3017 struct regcache
*regcache
3018 = get_thread_regcache (current_thread
, 1);
3019 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3023 if (current_thread
->last_resume_kind
== resume_stop
3024 && WSTOPSIG (w
) == SIGSTOP
)
3026 /* A thread that has been requested to stop by GDB with vCont;t,
3027 and it stopped cleanly, so report as SIG0. The use of
3028 SIGSTOP is an implementation detail. */
3029 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3031 else if (current_thread
->last_resume_kind
== resume_stop
3032 && WSTOPSIG (w
) != SIGSTOP
)
3034 /* A thread that has been requested to stop by GDB with vCont;t,
3035 but, it stopped for other reasons. */
3036 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3040 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3043 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3047 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3048 target_pid_to_str (ptid_of (current_thread
)),
3049 ourstatus
->kind
, ourstatus
->value
.sig
);
3053 return ptid_of (current_thread
);
3056 /* Get rid of any pending event in the pipe. */
3058 async_file_flush (void)
3064 ret
= read (linux_event_pipe
[0], &buf
, 1);
3065 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3068 /* Put something in the pipe, so the event loop wakes up. */
3070 async_file_mark (void)
3074 async_file_flush ();
3077 ret
= write (linux_event_pipe
[1], "+", 1);
3078 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3080 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3081 be awakened anyway. */
3085 linux_wait (ptid_t ptid
,
3086 struct target_waitstatus
*ourstatus
, int target_options
)
3090 /* Flush the async file first. */
3091 if (target_is_async_p ())
3092 async_file_flush ();
3096 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3098 while ((target_options
& TARGET_WNOHANG
) == 0
3099 && ptid_equal (event_ptid
, null_ptid
)
3100 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3102 /* If at least one stop was reported, there may be more. A single
3103 SIGCHLD can signal more than one child stop. */
3104 if (target_is_async_p ()
3105 && (target_options
& TARGET_WNOHANG
) != 0
3106 && !ptid_equal (event_ptid
, null_ptid
))
3112 /* Send a signal to an LWP. */
3115 kill_lwp (unsigned long lwpid
, int signo
)
3117 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3118 fails, then we are not using nptl threads and we should be using kill. */
3122 static int tkill_failed
;
3129 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3130 if (errno
!= ENOSYS
)
3137 return kill (lwpid
, signo
);
3141 linux_stop_lwp (struct lwp_info
*lwp
)
3147 send_sigstop (struct lwp_info
*lwp
)
3151 pid
= lwpid_of (get_lwp_thread (lwp
));
3153 /* If we already have a pending stop signal for this process, don't
3155 if (lwp
->stop_expected
)
3158 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3164 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3166 lwp
->stop_expected
= 1;
3167 kill_lwp (pid
, SIGSTOP
);
3171 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3173 struct thread_info
*thread
= (struct thread_info
*) entry
;
3174 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3176 /* Ignore EXCEPT. */
3187 /* Increment the suspend count of an LWP, and stop it, if not stopped
3190 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3193 struct thread_info
*thread
= (struct thread_info
*) entry
;
3194 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3196 /* Ignore EXCEPT. */
3202 return send_sigstop_callback (entry
, except
);
3206 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3208 /* It's dead, really. */
3211 /* Store the exit status for later. */
3212 lwp
->status_pending_p
= 1;
3213 lwp
->status_pending
= wstat
;
3215 /* Prevent trying to stop it. */
3218 /* No further stops are expected from a dead lwp. */
3219 lwp
->stop_expected
= 0;
3222 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3225 wait_for_sigstop (void)
3227 struct thread_info
*saved_thread
;
3232 saved_thread
= current_thread
;
3233 if (saved_thread
!= NULL
)
3234 saved_tid
= saved_thread
->entry
.id
;
3236 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3239 debug_printf ("wait_for_sigstop: pulling events\n");
3241 /* Passing NULL_PTID as filter indicates we want all events to be
3242 left pending. Eventually this returns when there are no
3243 unwaited-for children left. */
3244 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3246 gdb_assert (ret
== -1);
3248 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3249 current_thread
= saved_thread
;
3253 debug_printf ("Previously current thread died.\n");
3257 /* We can't change the current inferior behind GDB's back,
3258 otherwise, a subsequent command may apply to the wrong
3260 current_thread
= NULL
;
3264 /* Set a valid thread as current. */
3265 set_desired_thread (0);
3270 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3271 move it out, because we need to report the stop event to GDB. For
3272 example, if the user puts a breakpoint in the jump pad, it's
3273 because she wants to debug it. */
3276 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3278 struct thread_info
*thread
= (struct thread_info
*) entry
;
3279 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3281 gdb_assert (lwp
->suspended
== 0);
3282 gdb_assert (lwp
->stopped
);
3284 /* Allow debugging the jump pad, gdb_collect, etc.. */
3285 return (supports_fast_tracepoints ()
3286 && agent_loaded_p ()
3287 && (gdb_breakpoint_here (lwp
->stop_pc
)
3288 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3289 || thread
->last_resume_kind
== resume_step
)
3290 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3294 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3296 struct thread_info
*thread
= (struct thread_info
*) entry
;
3297 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3300 gdb_assert (lwp
->suspended
== 0);
3301 gdb_assert (lwp
->stopped
);
3303 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3305 /* Allow debugging the jump pad, gdb_collect, etc. */
3306 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3307 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3308 && thread
->last_resume_kind
!= resume_step
3309 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3312 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3317 lwp
->status_pending_p
= 0;
3318 enqueue_one_deferred_signal (lwp
, wstat
);
3321 debug_printf ("Signal %d for LWP %ld deferred "
3323 WSTOPSIG (*wstat
), lwpid_of (thread
));
3326 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3333 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3335 struct thread_info
*thread
= (struct thread_info
*) entry
;
3336 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3345 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3346 If SUSPEND, then also increase the suspend count of every LWP,
3350 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3352 /* Should not be called recursively. */
3353 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3358 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3359 suspend
? "stop-and-suspend" : "stop",
3361 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3365 stopping_threads
= (suspend
3366 ? STOPPING_AND_SUSPENDING_THREADS
3367 : STOPPING_THREADS
);
3370 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3372 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3373 wait_for_sigstop ();
3374 stopping_threads
= NOT_STOPPING_THREADS
;
3378 debug_printf ("stop_all_lwps done, setting stopping_threads "
3379 "back to !stopping\n");
3384 /* Resume execution of the inferior process.
3385 If STEP is nonzero, single-step it.
3386 If SIGNAL is nonzero, give it that signal. */
3389 linux_resume_one_lwp (struct lwp_info
*lwp
,
3390 int step
, int signal
, siginfo_t
*info
)
3392 struct thread_info
*thread
= get_lwp_thread (lwp
);
3393 struct thread_info
*saved_thread
;
3394 int fast_tp_collecting
;
3396 if (lwp
->stopped
== 0)
3399 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3401 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3403 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3404 user used the "jump" command, or "set $pc = foo"). */
3405 if (lwp
->stop_pc
!= get_pc (lwp
))
3407 /* Collecting 'while-stepping' actions doesn't make sense
3409 release_while_stepping_state_list (thread
);
3412 /* If we have pending signals or status, and a new signal, enqueue the
3413 signal. Also enqueue the signal if we are waiting to reinsert a
3414 breakpoint; it will be picked up again below. */
3416 && (lwp
->status_pending_p
3417 || lwp
->pending_signals
!= NULL
3418 || lwp
->bp_reinsert
!= 0
3419 || fast_tp_collecting
))
3421 struct pending_signals
*p_sig
;
3422 p_sig
= xmalloc (sizeof (*p_sig
));
3423 p_sig
->prev
= lwp
->pending_signals
;
3424 p_sig
->signal
= signal
;
3426 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3428 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3429 lwp
->pending_signals
= p_sig
;
3432 if (lwp
->status_pending_p
)
3435 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3436 " has pending status\n",
3437 lwpid_of (thread
), step
? "step" : "continue", signal
,
3438 lwp
->stop_expected
? "expected" : "not expected");
3442 saved_thread
= current_thread
;
3443 current_thread
= thread
;
3446 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3447 lwpid_of (thread
), step
? "step" : "continue", signal
,
3448 lwp
->stop_expected
? "expected" : "not expected");
3450 /* This bit needs some thinking about. If we get a signal that
3451 we must report while a single-step reinsert is still pending,
3452 we often end up resuming the thread. It might be better to
3453 (ew) allow a stack of pending events; then we could be sure that
3454 the reinsert happened right away and not lose any signals.
3456 Making this stack would also shrink the window in which breakpoints are
3457 uninserted (see comment in linux_wait_for_lwp) but not enough for
3458 complete correctness, so it won't solve that problem. It may be
3459 worthwhile just to solve this one, however. */
3460 if (lwp
->bp_reinsert
!= 0)
3463 debug_printf (" pending reinsert at 0x%s\n",
3464 paddress (lwp
->bp_reinsert
));
3466 if (can_hardware_single_step ())
3468 if (fast_tp_collecting
== 0)
3471 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3473 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3480 /* Postpone any pending signal. It was enqueued above. */
3484 if (fast_tp_collecting
== 1)
3487 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3488 " (exit-jump-pad-bkpt)\n",
3491 /* Postpone any pending signal. It was enqueued above. */
3494 else if (fast_tp_collecting
== 2)
3497 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3498 " single-stepping\n",
3501 if (can_hardware_single_step ())
3505 internal_error (__FILE__
, __LINE__
,
3506 "moving out of jump pad single-stepping"
3507 " not implemented on this target");
3510 /* Postpone any pending signal. It was enqueued above. */
3514 /* If we have while-stepping actions in this thread set it stepping.
3515 If we have a signal to deliver, it may or may not be set to
3516 SIG_IGN, we don't know. Assume so, and allow collecting
3517 while-stepping into a signal handler. A possible smart thing to
3518 do would be to set an internal breakpoint at the signal return
3519 address, continue, and carry on catching this while-stepping
3520 action only when that breakpoint is hit. A future
3522 if (thread
->while_stepping
!= NULL
3523 && can_hardware_single_step ())
3526 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3531 if (the_low_target
.get_pc
!= NULL
)
3533 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3535 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3539 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3540 (long) lwp
->stop_pc
);
3544 /* If we have pending signals, consume one unless we are trying to
3545 reinsert a breakpoint or we're trying to finish a fast tracepoint
3547 if (lwp
->pending_signals
!= NULL
3548 && lwp
->bp_reinsert
== 0
3549 && fast_tp_collecting
== 0)
3551 struct pending_signals
**p_sig
;
3553 p_sig
= &lwp
->pending_signals
;
3554 while ((*p_sig
)->prev
!= NULL
)
3555 p_sig
= &(*p_sig
)->prev
;
3557 signal
= (*p_sig
)->signal
;
3558 if ((*p_sig
)->info
.si_signo
!= 0)
3559 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3566 if (the_low_target
.prepare_to_resume
!= NULL
)
3567 the_low_target
.prepare_to_resume (lwp
);
3569 regcache_invalidate_thread (thread
);
3572 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3573 lwp
->stepping
= step
;
3574 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3575 (PTRACE_TYPE_ARG3
) 0,
3576 /* Coerce to a uintptr_t first to avoid potential gcc warning
3577 of coercing an 8 byte integer to a 4 byte pointer. */
3578 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3580 current_thread
= saved_thread
;
3583 /* ESRCH from ptrace either means that the thread was already
3584 running (an error) or that it is gone (a race condition). If
3585 it's gone, we will get a notification the next time we wait,
3586 so we can ignore the error. We could differentiate these
3587 two, but it's tricky without waiting; the thread still exists
3588 as a zombie, so sending it signal 0 would succeed. So just
3593 perror_with_name ("ptrace");
3597 struct thread_resume_array
3599 struct thread_resume
*resume
;
3603 /* This function is called once per thread via find_inferior.
3604 ARG is a pointer to a thread_resume_array struct.
3605 We look up the thread specified by ENTRY in ARG, and mark the thread
3606 with a pointer to the appropriate resume request.
3608 This algorithm is O(threads * resume elements), but resume elements
3609 is small (and will remain small at least until GDB supports thread
3613 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3615 struct thread_info
*thread
= (struct thread_info
*) entry
;
3616 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3618 struct thread_resume_array
*r
;
3622 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3624 ptid_t ptid
= r
->resume
[ndx
].thread
;
3625 if (ptid_equal (ptid
, minus_one_ptid
)
3626 || ptid_equal (ptid
, entry
->id
)
3627 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3629 || (ptid_get_pid (ptid
) == pid_of (thread
)
3630 && (ptid_is_pid (ptid
)
3631 || ptid_get_lwp (ptid
) == -1)))
3633 if (r
->resume
[ndx
].kind
== resume_stop
3634 && thread
->last_resume_kind
== resume_stop
)
3637 debug_printf ("already %s LWP %ld at GDB's request\n",
3638 (thread
->last_status
.kind
3639 == TARGET_WAITKIND_STOPPED
)
3647 lwp
->resume
= &r
->resume
[ndx
];
3648 thread
->last_resume_kind
= lwp
->resume
->kind
;
3650 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3651 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3653 /* If we had a deferred signal to report, dequeue one now.
3654 This can happen if LWP gets more than one signal while
3655 trying to get out of a jump pad. */
3657 && !lwp
->status_pending_p
3658 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3660 lwp
->status_pending_p
= 1;
3663 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3664 "leaving status pending.\n",
3665 WSTOPSIG (lwp
->status_pending
),
3673 /* No resume action for this thread. */
3679 /* find_inferior callback for linux_resume.
3680 Set *FLAG_P if this lwp has an interesting status pending. */
3683 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3685 struct thread_info
*thread
= (struct thread_info
*) entry
;
3686 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3688 /* LWPs which will not be resumed are not interesting, because
3689 we might not wait for them next time through linux_wait. */
3690 if (lwp
->resume
== NULL
)
3693 if (thread_still_has_status_pending_p (thread
))
3694 * (int *) flag_p
= 1;
3699 /* Return 1 if this lwp that GDB wants running is stopped at an
3700 internal breakpoint that we need to step over. It assumes that any
3701 required STOP_PC adjustment has already been propagated to the
3702 inferior's regcache. */
3705 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3707 struct thread_info
*thread
= (struct thread_info
*) entry
;
3708 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3709 struct thread_info
*saved_thread
;
3712 /* LWPs which will not be resumed are not interesting, because we
3713 might not wait for them next time through linux_wait. */
3718 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3723 if (thread
->last_resume_kind
== resume_stop
)
3726 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3732 gdb_assert (lwp
->suspended
>= 0);
3737 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3742 if (!lwp
->need_step_over
)
3745 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3748 if (lwp
->status_pending_p
)
3751 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3757 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3761 /* If the PC has changed since we stopped, then don't do anything,
3762 and let the breakpoint/tracepoint be hit. This happens if, for
3763 instance, GDB handled the decr_pc_after_break subtraction itself,
3764 GDB is OOL stepping this thread, or the user has issued a "jump"
3765 command, or poked thread's registers herself. */
3766 if (pc
!= lwp
->stop_pc
)
3769 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3770 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3772 paddress (lwp
->stop_pc
), paddress (pc
));
3774 lwp
->need_step_over
= 0;
3778 saved_thread
= current_thread
;
3779 current_thread
= thread
;
3781 /* We can only step over breakpoints we know about. */
3782 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3784 /* Don't step over a breakpoint that GDB expects to hit
3785 though. If the condition is being evaluated on the target's side
3786 and it evaluate to false, step over this breakpoint as well. */
3787 if (gdb_breakpoint_here (pc
)
3788 && gdb_condition_true_at_breakpoint (pc
)
3789 && gdb_no_commands_at_breakpoint (pc
))
3792 debug_printf ("Need step over [LWP %ld]? yes, but found"
3793 " GDB breakpoint at 0x%s; skipping step over\n",
3794 lwpid_of (thread
), paddress (pc
));
3796 current_thread
= saved_thread
;
3802 debug_printf ("Need step over [LWP %ld]? yes, "
3803 "found breakpoint at 0x%s\n",
3804 lwpid_of (thread
), paddress (pc
));
3806 /* We've found an lwp that needs stepping over --- return 1 so
3807 that find_inferior stops looking. */
3808 current_thread
= saved_thread
;
3810 /* If the step over is cancelled, this is set again. */
3811 lwp
->need_step_over
= 0;
3816 current_thread
= saved_thread
;
3819 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3821 lwpid_of (thread
), paddress (pc
));
3826 /* Start a step-over operation on LWP. When LWP stopped at a
3827 breakpoint, to make progress, we need to remove the breakpoint out
3828 of the way. If we let other threads run while we do that, they may
3829 pass by the breakpoint location and miss hitting it. To avoid
3830 that, a step-over momentarily stops all threads while LWP is
3831 single-stepped while the breakpoint is temporarily uninserted from
3832 the inferior. When the single-step finishes, we reinsert the
3833 breakpoint, and let all threads that are supposed to be running,
3836 On targets that don't support hardware single-step, we don't
3837 currently support full software single-stepping. Instead, we only
3838 support stepping over the thread event breakpoint, by asking the
3839 low target where to place a reinsert breakpoint. Since this
3840 routine assumes the breakpoint being stepped over is a thread event
3841 breakpoint, it usually assumes the return address of the current
3842 function is a good enough place to set the reinsert breakpoint. */
3845 start_step_over (struct lwp_info
*lwp
)
3847 struct thread_info
*thread
= get_lwp_thread (lwp
);
3848 struct thread_info
*saved_thread
;
3853 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3856 stop_all_lwps (1, lwp
);
3857 gdb_assert (lwp
->suspended
== 0);
3860 debug_printf ("Done stopping all threads for step-over.\n");
3862 /* Note, we should always reach here with an already adjusted PC,
3863 either by GDB (if we're resuming due to GDB's request), or by our
3864 caller, if we just finished handling an internal breakpoint GDB
3865 shouldn't care about. */
3868 saved_thread
= current_thread
;
3869 current_thread
= thread
;
3871 lwp
->bp_reinsert
= pc
;
3872 uninsert_breakpoints_at (pc
);
3873 uninsert_fast_tracepoint_jumps_at (pc
);
3875 if (can_hardware_single_step ())
3881 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3882 set_reinsert_breakpoint (raddr
);
3886 current_thread
= saved_thread
;
3888 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3890 /* Require next event from this LWP. */
3891 step_over_bkpt
= thread
->entry
.id
;
3895 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3896 start_step_over, if still there, and delete any reinsert
3897 breakpoints we've set, on non hardware single-step targets. */
3900 finish_step_over (struct lwp_info
*lwp
)
3902 if (lwp
->bp_reinsert
!= 0)
3905 debug_printf ("Finished step over.\n");
3907 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3908 may be no breakpoint to reinsert there by now. */
3909 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3910 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3912 lwp
->bp_reinsert
= 0;
3914 /* Delete any software-single-step reinsert breakpoints. No
3915 longer needed. We don't have to worry about other threads
3916 hitting this trap, and later not being able to explain it,
3917 because we were stepping over a breakpoint, and we hold all
3918 threads but LWP stopped while doing that. */
3919 if (!can_hardware_single_step ())
3920 delete_reinsert_breakpoints ();
3922 step_over_bkpt
= null_ptid
;
3929 /* This function is called once per thread. We check the thread's resume
3930 request, which will tell us whether to resume, step, or leave the thread
3931 stopped; and what signal, if any, it should be sent.
3933 For threads which we aren't explicitly told otherwise, we preserve
3934 the stepping flag; this is used for stepping over gdbserver-placed
3937 If pending_flags was set in any thread, we queue any needed
3938 signals, since we won't actually resume. We already have a pending
3939 event to report, so we don't need to preserve any step requests;
3940 they should be re-issued if necessary. */
3943 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3945 struct thread_info
*thread
= (struct thread_info
*) entry
;
3946 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3948 int leave_all_stopped
= * (int *) arg
;
3951 if (lwp
->resume
== NULL
)
3954 if (lwp
->resume
->kind
== resume_stop
)
3957 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3962 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3964 /* Stop the thread, and wait for the event asynchronously,
3965 through the event loop. */
3971 debug_printf ("already stopped LWP %ld\n",
3974 /* The LWP may have been stopped in an internal event that
3975 was not meant to be notified back to GDB (e.g., gdbserver
3976 breakpoint), so we should be reporting a stop event in
3979 /* If the thread already has a pending SIGSTOP, this is a
3980 no-op. Otherwise, something later will presumably resume
3981 the thread and this will cause it to cancel any pending
3982 operation, due to last_resume_kind == resume_stop. If
3983 the thread already has a pending status to report, we
3984 will still report it the next time we wait - see
3985 status_pending_p_callback. */
3987 /* If we already have a pending signal to report, then
3988 there's no need to queue a SIGSTOP, as this means we're
3989 midway through moving the LWP out of the jumppad, and we
3990 will report the pending signal as soon as that is
3992 if (lwp
->pending_signals_to_report
== NULL
)
3996 /* For stop requests, we're done. */
3998 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4002 /* If this thread which is about to be resumed has a pending status,
4003 then don't resume any threads - we can just report the pending
4004 status. Make sure to queue any signals that would otherwise be
4005 sent. In all-stop mode, we do this decision based on if *any*
4006 thread has a pending status. If there's a thread that needs the
4007 step-over-breakpoint dance, then don't resume any other thread
4008 but that particular one. */
4009 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
4014 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4016 step
= (lwp
->resume
->kind
== resume_step
);
4017 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4022 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4024 /* If we have a new signal, enqueue the signal. */
4025 if (lwp
->resume
->sig
!= 0)
4027 struct pending_signals
*p_sig
;
4028 p_sig
= xmalloc (sizeof (*p_sig
));
4029 p_sig
->prev
= lwp
->pending_signals
;
4030 p_sig
->signal
= lwp
->resume
->sig
;
4031 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4033 /* If this is the same signal we were previously stopped by,
4034 make sure to queue its siginfo. We can ignore the return
4035 value of ptrace; if it fails, we'll skip
4036 PTRACE_SETSIGINFO. */
4037 if (WIFSTOPPED (lwp
->last_status
)
4038 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4039 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4042 lwp
->pending_signals
= p_sig
;
4046 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4052 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4054 struct thread_resume_array array
= { resume_info
, n
};
4055 struct thread_info
*need_step_over
= NULL
;
4057 int leave_all_stopped
;
4062 debug_printf ("linux_resume:\n");
4065 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4067 /* If there is a thread which would otherwise be resumed, which has
4068 a pending status, then don't resume any threads - we can just
4069 report the pending status. Make sure to queue any signals that
4070 would otherwise be sent. In non-stop mode, we'll apply this
4071 logic to each thread individually. We consume all pending events
4072 before considering to start a step-over (in all-stop). */
4075 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4077 /* If there is a thread which would otherwise be resumed, which is
4078 stopped at a breakpoint that needs stepping over, then don't
4079 resume any threads - have it step over the breakpoint with all
4080 other threads stopped, then resume all threads again. Make sure
4081 to queue any signals that would otherwise be delivered or
4083 if (!any_pending
&& supports_breakpoints ())
4085 = (struct thread_info
*) find_inferior (&all_threads
,
4086 need_step_over_p
, NULL
);
4088 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4092 if (need_step_over
!= NULL
)
4093 debug_printf ("Not resuming all, need step over\n");
4094 else if (any_pending
)
4095 debug_printf ("Not resuming, all-stop and found "
4096 "an LWP with pending status\n");
4098 debug_printf ("Resuming, no pending status or step over needed\n");
4101 /* Even if we're leaving threads stopped, queue all signals we'd
4102 otherwise deliver. */
4103 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4106 start_step_over (get_thread_lwp (need_step_over
));
4110 debug_printf ("linux_resume done\n");
4115 /* This function is called once per thread. We check the thread's
4116 last resume request, which will tell us whether to resume, step, or
4117 leave the thread stopped. Any signal the client requested to be
4118 delivered has already been enqueued at this point.
4120 If any thread that GDB wants running is stopped at an internal
4121 breakpoint that needs stepping over, we start a step-over operation
4122 on that particular thread, and leave all others stopped. */
4125 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4127 struct thread_info
*thread
= (struct thread_info
*) entry
;
4128 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4135 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4140 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4144 if (thread
->last_resume_kind
== resume_stop
4145 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4148 debug_printf (" client wants LWP to remain %ld stopped\n",
4153 if (lwp
->status_pending_p
)
4156 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4161 gdb_assert (lwp
->suspended
>= 0);
4166 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4170 if (thread
->last_resume_kind
== resume_stop
4171 && lwp
->pending_signals_to_report
== NULL
4172 && lwp
->collecting_fast_tracepoint
== 0)
4174 /* We haven't reported this LWP as stopped yet (otherwise, the
4175 last_status.kind check above would catch it, and we wouldn't
4176 reach here. This LWP may have been momentarily paused by a
4177 stop_all_lwps call while handling for example, another LWP's
4178 step-over. In that case, the pending expected SIGSTOP signal
4179 that was queued at vCont;t handling time will have already
4180 been consumed by wait_for_sigstop, and so we need to requeue
4181 another one here. Note that if the LWP already has a SIGSTOP
4182 pending, this is a no-op. */
4185 debug_printf ("Client wants LWP %ld to stop. "
4186 "Making sure it has a SIGSTOP pending\n",
4192 step
= thread
->last_resume_kind
== resume_step
;
4193 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4198 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4200 struct thread_info
*thread
= (struct thread_info
*) entry
;
4201 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4207 gdb_assert (lwp
->suspended
>= 0);
4209 return proceed_one_lwp (entry
, except
);
4212 /* When we finish a step-over, set threads running again. If there's
4213 another thread that may need a step-over, now's the time to start
4214 it. Eventually, we'll move all threads past their breakpoints. */
4217 proceed_all_lwps (void)
4219 struct thread_info
*need_step_over
;
4221 /* If there is a thread which would otherwise be resumed, which is
4222 stopped at a breakpoint that needs stepping over, then don't
4223 resume any threads - have it step over the breakpoint with all
4224 other threads stopped, then resume all threads again. */
4226 if (supports_breakpoints ())
4229 = (struct thread_info
*) find_inferior (&all_threads
,
4230 need_step_over_p
, NULL
);
4232 if (need_step_over
!= NULL
)
4235 debug_printf ("proceed_all_lwps: found "
4236 "thread %ld needing a step-over\n",
4237 lwpid_of (need_step_over
));
4239 start_step_over (get_thread_lwp (need_step_over
));
4245 debug_printf ("Proceeding, no step-over needed\n");
4247 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4250 /* Stopped LWPs that the client wanted to be running, that don't have
4251 pending statuses, are set to run again, except for EXCEPT, if not
4252 NULL. This undoes a stop_all_lwps call. */
4255 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4261 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4262 lwpid_of (get_lwp_thread (except
)));
4264 debug_printf ("unstopping all lwps\n");
4268 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4270 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4274 debug_printf ("unstop_all_lwps done\n");
4280 #ifdef HAVE_LINUX_REGSETS
4282 #define use_linux_regsets 1
4284 /* Returns true if REGSET has been disabled. */
4287 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4289 return (info
->disabled_regsets
!= NULL
4290 && info
->disabled_regsets
[regset
- info
->regsets
]);
4293 /* Disable REGSET. */
4296 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4300 dr_offset
= regset
- info
->regsets
;
4301 if (info
->disabled_regsets
== NULL
)
4302 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4303 info
->disabled_regsets
[dr_offset
] = 1;
4307 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4308 struct regcache
*regcache
)
4310 struct regset_info
*regset
;
4311 int saw_general_regs
= 0;
4315 pid
= lwpid_of (current_thread
);
4316 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4321 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4324 buf
= xmalloc (regset
->size
);
4326 nt_type
= regset
->nt_type
;
4330 iov
.iov_len
= regset
->size
;
4331 data
= (void *) &iov
;
4337 res
= ptrace (regset
->get_request
, pid
,
4338 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4340 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4346 /* If we get EIO on a regset, do not try it again for
4347 this process mode. */
4348 disable_regset (regsets_info
, regset
);
4350 else if (errno
== ENODATA
)
4352 /* ENODATA may be returned if the regset is currently
4353 not "active". This can happen in normal operation,
4354 so suppress the warning in this case. */
4359 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4366 if (regset
->type
== GENERAL_REGS
)
4367 saw_general_regs
= 1;
4368 regset
->store_function (regcache
, buf
);
4372 if (saw_general_regs
)
4379 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4380 struct regcache
*regcache
)
4382 struct regset_info
*regset
;
4383 int saw_general_regs
= 0;
4387 pid
= lwpid_of (current_thread
);
4388 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4393 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4394 || regset
->fill_function
== NULL
)
4397 buf
= xmalloc (regset
->size
);
4399 /* First fill the buffer with the current register set contents,
4400 in case there are any items in the kernel's regset that are
4401 not in gdbserver's regcache. */
4403 nt_type
= regset
->nt_type
;
4407 iov
.iov_len
= regset
->size
;
4408 data
= (void *) &iov
;
4414 res
= ptrace (regset
->get_request
, pid
,
4415 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4417 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4422 /* Then overlay our cached registers on that. */
4423 regset
->fill_function (regcache
, buf
);
4425 /* Only now do we write the register set. */
4427 res
= ptrace (regset
->set_request
, pid
,
4428 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4430 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4438 /* If we get EIO on a regset, do not try it again for
4439 this process mode. */
4440 disable_regset (regsets_info
, regset
);
4442 else if (errno
== ESRCH
)
4444 /* At this point, ESRCH should mean the process is
4445 already gone, in which case we simply ignore attempts
4446 to change its registers. See also the related
4447 comment in linux_resume_one_lwp. */
4453 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4456 else if (regset
->type
== GENERAL_REGS
)
4457 saw_general_regs
= 1;
4460 if (saw_general_regs
)
4466 #else /* !HAVE_LINUX_REGSETS */
4468 #define use_linux_regsets 0
4469 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4470 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4474 /* Return 1 if register REGNO is supported by one of the regset ptrace
4475 calls or 0 if it has to be transferred individually. */
4478 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4480 unsigned char mask
= 1 << (regno
% 8);
4481 size_t index
= regno
/ 8;
4483 return (use_linux_regsets
4484 && (regs_info
->regset_bitmap
== NULL
4485 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4488 #ifdef HAVE_LINUX_USRREGS
4491 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4495 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4496 error ("Invalid register number %d.", regnum
);
4498 addr
= usrregs
->regmap
[regnum
];
4503 /* Fetch one register. */
4505 fetch_register (const struct usrregs_info
*usrregs
,
4506 struct regcache
*regcache
, int regno
)
4513 if (regno
>= usrregs
->num_regs
)
4515 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4518 regaddr
= register_addr (usrregs
, regno
);
4522 size
= ((register_size (regcache
->tdesc
, regno
)
4523 + sizeof (PTRACE_XFER_TYPE
) - 1)
4524 & -sizeof (PTRACE_XFER_TYPE
));
4525 buf
= alloca (size
);
4527 pid
= lwpid_of (current_thread
);
4528 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4531 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4532 ptrace (PTRACE_PEEKUSER
, pid
,
4533 /* Coerce to a uintptr_t first to avoid potential gcc warning
4534 of coercing an 8 byte integer to a 4 byte pointer. */
4535 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4536 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4538 error ("reading register %d: %s", regno
, strerror (errno
));
4541 if (the_low_target
.supply_ptrace_register
)
4542 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4544 supply_register (regcache
, regno
, buf
);
4547 /* Store one register. */
4549 store_register (const struct usrregs_info
*usrregs
,
4550 struct regcache
*regcache
, int regno
)
4557 if (regno
>= usrregs
->num_regs
)
4559 if ((*the_low_target
.cannot_store_register
) (regno
))
4562 regaddr
= register_addr (usrregs
, regno
);
4566 size
= ((register_size (regcache
->tdesc
, regno
)
4567 + sizeof (PTRACE_XFER_TYPE
) - 1)
4568 & -sizeof (PTRACE_XFER_TYPE
));
4569 buf
= alloca (size
);
4570 memset (buf
, 0, size
);
4572 if (the_low_target
.collect_ptrace_register
)
4573 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4575 collect_register (regcache
, regno
, buf
);
4577 pid
= lwpid_of (current_thread
);
4578 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4581 ptrace (PTRACE_POKEUSER
, pid
,
4582 /* Coerce to a uintptr_t first to avoid potential gcc warning
4583 about coercing an 8 byte integer to a 4 byte pointer. */
4584 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4585 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4588 /* At this point, ESRCH should mean the process is
4589 already gone, in which case we simply ignore attempts
4590 to change its registers. See also the related
4591 comment in linux_resume_one_lwp. */
4595 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4596 error ("writing register %d: %s", regno
, strerror (errno
));
4598 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4602 /* Fetch all registers, or just one, from the child process.
4603 If REGNO is -1, do this for all registers, skipping any that are
4604 assumed to have been retrieved by regsets_fetch_inferior_registers,
4605 unless ALL is non-zero.
4606 Otherwise, REGNO specifies which register (so we can save time). */
4608 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4609 struct regcache
*regcache
, int regno
, int all
)
4611 struct usrregs_info
*usr
= regs_info
->usrregs
;
4615 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4616 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4617 fetch_register (usr
, regcache
, regno
);
4620 fetch_register (usr
, regcache
, regno
);
4623 /* Store our register values back into the inferior.
4624 If REGNO is -1, do this for all registers, skipping any that are
4625 assumed to have been saved by regsets_store_inferior_registers,
4626 unless ALL is non-zero.
4627 Otherwise, REGNO specifies which register (so we can save time). */
4629 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4630 struct regcache
*regcache
, int regno
, int all
)
4632 struct usrregs_info
*usr
= regs_info
->usrregs
;
4636 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4637 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4638 store_register (usr
, regcache
, regno
);
4641 store_register (usr
, regcache
, regno
);
4644 #else /* !HAVE_LINUX_USRREGS */
4646 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4647 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4653 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4657 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4661 if (the_low_target
.fetch_register
!= NULL
4662 && regs_info
->usrregs
!= NULL
)
4663 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4664 (*the_low_target
.fetch_register
) (regcache
, regno
);
4666 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4667 if (regs_info
->usrregs
!= NULL
)
4668 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4672 if (the_low_target
.fetch_register
!= NULL
4673 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4676 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4678 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4680 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4681 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4686 linux_store_registers (struct regcache
*regcache
, int regno
)
4690 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4694 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4696 if (regs_info
->usrregs
!= NULL
)
4697 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4701 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4703 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4705 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4706 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4711 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4712 to debugger memory starting at MYADDR. */
4715 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4717 int pid
= lwpid_of (current_thread
);
4718 register PTRACE_XFER_TYPE
*buffer
;
4719 register CORE_ADDR addr
;
4726 /* Try using /proc. Don't bother for one word. */
4727 if (len
>= 3 * sizeof (long))
4731 /* We could keep this file open and cache it - possibly one per
4732 thread. That requires some juggling, but is even faster. */
4733 sprintf (filename
, "/proc/%d/mem", pid
);
4734 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4738 /* If pread64 is available, use it. It's faster if the kernel
4739 supports it (only one syscall), and it's 64-bit safe even on
4740 32-bit platforms (for instance, SPARC debugging a SPARC64
4743 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4746 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4747 bytes
= read (fd
, myaddr
, len
);
4754 /* Some data was read, we'll try to get the rest with ptrace. */
4764 /* Round starting address down to longword boundary. */
4765 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4766 /* Round ending address up; get number of longwords that makes. */
4767 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4768 / sizeof (PTRACE_XFER_TYPE
));
4769 /* Allocate buffer of that many longwords. */
4770 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4772 /* Read all the longwords */
4774 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4776 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4777 about coercing an 8 byte integer to a 4 byte pointer. */
4778 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4779 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4780 (PTRACE_TYPE_ARG4
) 0);
4786 /* Copy appropriate bytes out of the buffer. */
4789 i
*= sizeof (PTRACE_XFER_TYPE
);
4790 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4792 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4799 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4800 memory at MEMADDR. On failure (cannot write to the inferior)
4801 returns the value of errno. Always succeeds if LEN is zero. */
4804 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4807 /* Round starting address down to longword boundary. */
4808 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4809 /* Round ending address up; get number of longwords that makes. */
4811 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4812 / sizeof (PTRACE_XFER_TYPE
);
4814 /* Allocate buffer of that many longwords. */
4815 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4816 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4818 int pid
= lwpid_of (current_thread
);
4822 /* Zero length write always succeeds. */
4828 /* Dump up to four bytes. */
4829 unsigned int val
= * (unsigned int *) myaddr
;
4835 val
= val
& 0xffffff;
4836 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4837 val
, (long)memaddr
);
4840 /* Fill start and end extra bytes of buffer with existing memory data. */
4843 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4844 about coercing an 8 byte integer to a 4 byte pointer. */
4845 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4846 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4847 (PTRACE_TYPE_ARG4
) 0);
4855 = ptrace (PTRACE_PEEKTEXT
, pid
,
4856 /* Coerce to a uintptr_t first to avoid potential gcc warning
4857 about coercing an 8 byte integer to a 4 byte pointer. */
4858 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4859 * sizeof (PTRACE_XFER_TYPE
)),
4860 (PTRACE_TYPE_ARG4
) 0);
4865 /* Copy data to be written over corresponding part of buffer. */
4867 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4870 /* Write the entire buffer. */
4872 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4875 ptrace (PTRACE_POKETEXT
, pid
,
4876 /* Coerce to a uintptr_t first to avoid potential gcc warning
4877 about coercing an 8 byte integer to a 4 byte pointer. */
4878 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4879 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4888 linux_look_up_symbols (void)
4890 #ifdef USE_THREAD_DB
4891 struct process_info
*proc
= current_process ();
4893 if (proc
->priv
->thread_db
!= NULL
)
4896 /* If the kernel supports tracing clones, then we don't need to
4897 use the magic thread event breakpoint to learn about
4899 thread_db_init (!linux_supports_traceclone ());
4904 linux_request_interrupt (void)
4906 extern unsigned long signal_pid
;
4908 /* Send a SIGINT to the process group. This acts just like the user
4909 typed a ^C on the controlling terminal. */
4910 kill (-signal_pid
, SIGINT
);
4913 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4914 to debugger memory starting at MYADDR. */
4917 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4919 char filename
[PATH_MAX
];
4921 int pid
= lwpid_of (current_thread
);
4923 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4925 fd
= open (filename
, O_RDONLY
);
4929 if (offset
!= (CORE_ADDR
) 0
4930 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4933 n
= read (fd
, myaddr
, len
);
4940 /* These breakpoint and watchpoint related wrapper functions simply
4941 pass on the function call if the target has registered a
4942 corresponding function. */
4945 linux_supports_z_point_type (char z_type
)
4947 return (the_low_target
.supports_z_point_type
!= NULL
4948 && the_low_target
.supports_z_point_type (z_type
));
4952 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4953 int size
, struct raw_breakpoint
*bp
)
4955 if (the_low_target
.insert_point
!= NULL
)
4956 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4958 /* Unsupported (see target.h). */
4963 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4964 int size
, struct raw_breakpoint
*bp
)
4966 if (the_low_target
.remove_point
!= NULL
)
4967 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4969 /* Unsupported (see target.h). */
4973 /* Implement the to_stopped_by_sw_breakpoint target_ops
4977 linux_stopped_by_sw_breakpoint (void)
4979 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4981 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
4984 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
4988 linux_supports_stopped_by_sw_breakpoint (void)
4990 return USE_SIGTRAP_SIGINFO
;
4993 /* Implement the to_stopped_by_hw_breakpoint target_ops
4997 linux_stopped_by_hw_breakpoint (void)
4999 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5001 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5004 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5008 linux_supports_stopped_by_hw_breakpoint (void)
5010 return USE_SIGTRAP_SIGINFO
;
5014 linux_stopped_by_watchpoint (void)
5016 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5018 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5022 linux_stopped_data_address (void)
5024 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5026 return lwp
->stopped_data_address
;
5029 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5030 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5031 && defined(PT_TEXT_END_ADDR)
5033 /* This is only used for targets that define PT_TEXT_ADDR,
5034 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5035 the target has different ways of acquiring this information, like
5038 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5039 to tell gdb about. */
5042 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5044 unsigned long text
, text_end
, data
;
5045 int pid
= lwpid_of (get_thread_lwp (current_thread
));
5049 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5050 (PTRACE_TYPE_ARG4
) 0);
5051 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5052 (PTRACE_TYPE_ARG4
) 0);
5053 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5054 (PTRACE_TYPE_ARG4
) 0);
5058 /* Both text and data offsets produced at compile-time (and so
5059 used by gdb) are relative to the beginning of the program,
5060 with the data segment immediately following the text segment.
5061 However, the actual runtime layout in memory may put the data
5062 somewhere else, so when we send gdb a data base-address, we
5063 use the real data base address and subtract the compile-time
5064 data base-address from it (which is just the length of the
5065 text segment). BSS immediately follows data in both
5068 *data_p
= data
- (text_end
- text
);
5077 linux_qxfer_osdata (const char *annex
,
5078 unsigned char *readbuf
, unsigned const char *writebuf
,
5079 CORE_ADDR offset
, int len
)
5081 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5084 /* Convert a native/host siginfo object, into/from the siginfo in the
5085 layout of the inferiors' architecture. */
5088 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5092 if (the_low_target
.siginfo_fixup
!= NULL
)
5093 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5095 /* If there was no callback, or the callback didn't do anything,
5096 then just do a straight memcpy. */
5100 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5102 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5107 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5108 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5112 char inf_siginfo
[sizeof (siginfo_t
)];
5114 if (current_thread
== NULL
)
5117 pid
= lwpid_of (current_thread
);
5120 debug_printf ("%s siginfo for lwp %d.\n",
5121 readbuf
!= NULL
? "Reading" : "Writing",
5124 if (offset
>= sizeof (siginfo
))
5127 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5130 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5131 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5132 inferior with a 64-bit GDBSERVER should look the same as debugging it
5133 with a 32-bit GDBSERVER, we need to convert it. */
5134 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5136 if (offset
+ len
> sizeof (siginfo
))
5137 len
= sizeof (siginfo
) - offset
;
5139 if (readbuf
!= NULL
)
5140 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5143 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5145 /* Convert back to ptrace layout before flushing it out. */
5146 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5148 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5155 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5156 so we notice when children change state; as the handler for the
5157 sigsuspend in my_waitpid. */
5160 sigchld_handler (int signo
)
5162 int old_errno
= errno
;
5168 /* fprintf is not async-signal-safe, so call write
5170 if (write (2, "sigchld_handler\n",
5171 sizeof ("sigchld_handler\n") - 1) < 0)
5172 break; /* just ignore */
5176 if (target_is_async_p ())
5177 async_file_mark (); /* trigger a linux_wait */
5183 linux_supports_non_stop (void)
5189 linux_async (int enable
)
5191 int previous
= target_is_async_p ();
5194 debug_printf ("linux_async (%d), previous=%d\n",
5197 if (previous
!= enable
)
5200 sigemptyset (&mask
);
5201 sigaddset (&mask
, SIGCHLD
);
5203 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5207 if (pipe (linux_event_pipe
) == -1)
5209 linux_event_pipe
[0] = -1;
5210 linux_event_pipe
[1] = -1;
5211 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5213 warning ("creating event pipe failed.");
5217 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5218 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5220 /* Register the event loop handler. */
5221 add_file_handler (linux_event_pipe
[0],
5222 handle_target_event
, NULL
);
5224 /* Always trigger a linux_wait. */
5229 delete_file_handler (linux_event_pipe
[0]);
5231 close (linux_event_pipe
[0]);
5232 close (linux_event_pipe
[1]);
5233 linux_event_pipe
[0] = -1;
5234 linux_event_pipe
[1] = -1;
5237 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5244 linux_start_non_stop (int nonstop
)
5246 /* Register or unregister from event-loop accordingly. */
5247 linux_async (nonstop
);
5249 if (target_is_async_p () != (nonstop
!= 0))
5256 linux_supports_multi_process (void)
5262 linux_supports_disable_randomization (void)
5264 #ifdef HAVE_PERSONALITY
5272 linux_supports_agent (void)
5278 linux_supports_range_stepping (void)
5280 if (*the_low_target
.supports_range_stepping
== NULL
)
5283 return (*the_low_target
.supports_range_stepping
) ();
5286 /* Enumerate spufs IDs for process PID. */
5288 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5294 struct dirent
*entry
;
5296 sprintf (path
, "/proc/%ld/fd", pid
);
5297 dir
= opendir (path
);
5302 while ((entry
= readdir (dir
)) != NULL
)
5308 fd
= atoi (entry
->d_name
);
5312 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5313 if (stat (path
, &st
) != 0)
5315 if (!S_ISDIR (st
.st_mode
))
5318 if (statfs (path
, &stfs
) != 0)
5320 if (stfs
.f_type
!= SPUFS_MAGIC
)
5323 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5325 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5335 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5336 object type, using the /proc file system. */
5338 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5339 unsigned const char *writebuf
,
5340 CORE_ADDR offset
, int len
)
5342 long pid
= lwpid_of (current_thread
);
5347 if (!writebuf
&& !readbuf
)
5355 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5358 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5359 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5364 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5371 ret
= write (fd
, writebuf
, (size_t) len
);
5373 ret
= read (fd
, readbuf
, (size_t) len
);
5379 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5380 struct target_loadseg
5382 /* Core address to which the segment is mapped. */
5384 /* VMA recorded in the program header. */
5386 /* Size of this segment in memory. */
5390 # if defined PT_GETDSBT
5391 struct target_loadmap
5393 /* Protocol version number, must be zero. */
5395 /* Pointer to the DSBT table, its size, and the DSBT index. */
5396 unsigned *dsbt_table
;
5397 unsigned dsbt_size
, dsbt_index
;
5398 /* Number of segments in this map. */
5400 /* The actual memory map. */
5401 struct target_loadseg segs
[/*nsegs*/];
5403 # define LINUX_LOADMAP PT_GETDSBT
5404 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5405 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5407 struct target_loadmap
5409 /* Protocol version number, must be zero. */
5411 /* Number of segments in this map. */
5413 /* The actual memory map. */
5414 struct target_loadseg segs
[/*nsegs*/];
5416 # define LINUX_LOADMAP PTRACE_GETFDPIC
5417 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5418 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5422 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5423 unsigned char *myaddr
, unsigned int len
)
5425 int pid
= lwpid_of (current_thread
);
5427 struct target_loadmap
*data
= NULL
;
5428 unsigned int actual_length
, copy_length
;
5430 if (strcmp (annex
, "exec") == 0)
5431 addr
= (int) LINUX_LOADMAP_EXEC
;
5432 else if (strcmp (annex
, "interp") == 0)
5433 addr
= (int) LINUX_LOADMAP_INTERP
;
5437 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5443 actual_length
= sizeof (struct target_loadmap
)
5444 + sizeof (struct target_loadseg
) * data
->nsegs
;
5446 if (offset
< 0 || offset
> actual_length
)
5449 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5450 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5454 # define linux_read_loadmap NULL
5455 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5458 linux_process_qsupported (const char *query
)
5460 if (the_low_target
.process_qsupported
!= NULL
)
5461 the_low_target
.process_qsupported (query
);
5465 linux_supports_tracepoints (void)
5467 if (*the_low_target
.supports_tracepoints
== NULL
)
5470 return (*the_low_target
.supports_tracepoints
) ();
5474 linux_read_pc (struct regcache
*regcache
)
5476 if (the_low_target
.get_pc
== NULL
)
5479 return (*the_low_target
.get_pc
) (regcache
);
5483 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5485 gdb_assert (the_low_target
.set_pc
!= NULL
);
5487 (*the_low_target
.set_pc
) (regcache
, pc
);
5491 linux_thread_stopped (struct thread_info
*thread
)
5493 return get_thread_lwp (thread
)->stopped
;
5496 /* This exposes stop-all-threads functionality to other modules. */
5499 linux_pause_all (int freeze
)
5501 stop_all_lwps (freeze
, NULL
);
5504 /* This exposes unstop-all-threads functionality to other gdbserver
5508 linux_unpause_all (int unfreeze
)
5510 unstop_all_lwps (unfreeze
, NULL
);
5514 linux_prepare_to_access_memory (void)
5516 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5519 linux_pause_all (1);
5524 linux_done_accessing_memory (void)
5526 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5529 linux_unpause_all (1);
5533 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5534 CORE_ADDR collector
,
5537 CORE_ADDR
*jump_entry
,
5538 CORE_ADDR
*trampoline
,
5539 ULONGEST
*trampoline_size
,
5540 unsigned char *jjump_pad_insn
,
5541 ULONGEST
*jjump_pad_insn_size
,
5542 CORE_ADDR
*adjusted_insn_addr
,
5543 CORE_ADDR
*adjusted_insn_addr_end
,
5546 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5547 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5548 jump_entry
, trampoline
, trampoline_size
,
5549 jjump_pad_insn
, jjump_pad_insn_size
,
5550 adjusted_insn_addr
, adjusted_insn_addr_end
,
5554 static struct emit_ops
*
5555 linux_emit_ops (void)
5557 if (the_low_target
.emit_ops
!= NULL
)
5558 return (*the_low_target
.emit_ops
) ();
5564 linux_get_min_fast_tracepoint_insn_len (void)
5566 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5569 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5572 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5573 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5575 char filename
[PATH_MAX
];
5577 const int auxv_size
= is_elf64
5578 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5579 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5581 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5583 fd
= open (filename
, O_RDONLY
);
5589 while (read (fd
, buf
, auxv_size
) == auxv_size
5590 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5594 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5596 switch (aux
->a_type
)
5599 *phdr_memaddr
= aux
->a_un
.a_val
;
5602 *num_phdr
= aux
->a_un
.a_val
;
5608 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5610 switch (aux
->a_type
)
5613 *phdr_memaddr
= aux
->a_un
.a_val
;
5616 *num_phdr
= aux
->a_un
.a_val
;
5624 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5626 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5627 "phdr_memaddr = %ld, phdr_num = %d",
5628 (long) *phdr_memaddr
, *num_phdr
);
5635 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5638 get_dynamic (const int pid
, const int is_elf64
)
5640 CORE_ADDR phdr_memaddr
, relocation
;
5642 unsigned char *phdr_buf
;
5643 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5645 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5648 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5649 phdr_buf
= alloca (num_phdr
* phdr_size
);
5651 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5654 /* Compute relocation: it is expected to be 0 for "regular" executables,
5655 non-zero for PIE ones. */
5657 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5660 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5662 if (p
->p_type
== PT_PHDR
)
5663 relocation
= phdr_memaddr
- p
->p_vaddr
;
5667 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5669 if (p
->p_type
== PT_PHDR
)
5670 relocation
= phdr_memaddr
- p
->p_vaddr
;
5673 if (relocation
== -1)
5675 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5676 any real world executables, including PIE executables, have always
5677 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5678 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5679 or present DT_DEBUG anyway (fpc binaries are statically linked).
5681 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5683 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5688 for (i
= 0; i
< num_phdr
; i
++)
5692 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5694 if (p
->p_type
== PT_DYNAMIC
)
5695 return p
->p_vaddr
+ relocation
;
5699 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5701 if (p
->p_type
== PT_DYNAMIC
)
5702 return p
->p_vaddr
+ relocation
;
5709 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5710 can be 0 if the inferior does not yet have the library list initialized.
5711 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5712 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5715 get_r_debug (const int pid
, const int is_elf64
)
5717 CORE_ADDR dynamic_memaddr
;
5718 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5719 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5722 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5723 if (dynamic_memaddr
== 0)
5726 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5730 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5731 #ifdef DT_MIPS_RLD_MAP
5735 unsigned char buf
[sizeof (Elf64_Xword
)];
5739 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5741 if (linux_read_memory (dyn
->d_un
.d_val
,
5742 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5747 #endif /* DT_MIPS_RLD_MAP */
5749 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5750 map
= dyn
->d_un
.d_val
;
5752 if (dyn
->d_tag
== DT_NULL
)
5757 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5758 #ifdef DT_MIPS_RLD_MAP
5762 unsigned char buf
[sizeof (Elf32_Word
)];
5766 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5768 if (linux_read_memory (dyn
->d_un
.d_val
,
5769 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5774 #endif /* DT_MIPS_RLD_MAP */
5776 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5777 map
= dyn
->d_un
.d_val
;
5779 if (dyn
->d_tag
== DT_NULL
)
5783 dynamic_memaddr
+= dyn_size
;
5789 /* Read one pointer from MEMADDR in the inferior. */
5792 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5796 /* Go through a union so this works on either big or little endian
5797 hosts, when the inferior's pointer size is smaller than the size
5798 of CORE_ADDR. It is assumed the inferior's endianness is the
5799 same of the superior's. */
5802 CORE_ADDR core_addr
;
5807 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5810 if (ptr_size
== sizeof (CORE_ADDR
))
5811 *ptr
= addr
.core_addr
;
5812 else if (ptr_size
== sizeof (unsigned int))
5815 gdb_assert_not_reached ("unhandled pointer size");
5820 struct link_map_offsets
5822 /* Offset and size of r_debug.r_version. */
5823 int r_version_offset
;
5825 /* Offset and size of r_debug.r_map. */
5828 /* Offset to l_addr field in struct link_map. */
5831 /* Offset to l_name field in struct link_map. */
5834 /* Offset to l_ld field in struct link_map. */
5837 /* Offset to l_next field in struct link_map. */
5840 /* Offset to l_prev field in struct link_map. */
5844 /* Construct qXfer:libraries-svr4:read reply. */
5847 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5848 unsigned const char *writebuf
,
5849 CORE_ADDR offset
, int len
)
5852 unsigned document_len
;
5853 struct process_info_private
*const priv
= current_process ()->priv
;
5854 char filename
[PATH_MAX
];
5857 static const struct link_map_offsets lmo_32bit_offsets
=
5859 0, /* r_version offset. */
5860 4, /* r_debug.r_map offset. */
5861 0, /* l_addr offset in link_map. */
5862 4, /* l_name offset in link_map. */
5863 8, /* l_ld offset in link_map. */
5864 12, /* l_next offset in link_map. */
5865 16 /* l_prev offset in link_map. */
5868 static const struct link_map_offsets lmo_64bit_offsets
=
5870 0, /* r_version offset. */
5871 8, /* r_debug.r_map offset. */
5872 0, /* l_addr offset in link_map. */
5873 8, /* l_name offset in link_map. */
5874 16, /* l_ld offset in link_map. */
5875 24, /* l_next offset in link_map. */
5876 32 /* l_prev offset in link_map. */
5878 const struct link_map_offsets
*lmo
;
5879 unsigned int machine
;
5881 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5882 int allocated
= 1024;
5884 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5885 int header_done
= 0;
5887 if (writebuf
!= NULL
)
5889 if (readbuf
== NULL
)
5892 pid
= lwpid_of (current_thread
);
5893 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5894 is_elf64
= elf_64_file_p (filename
, &machine
);
5895 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5896 ptr_size
= is_elf64
? 8 : 4;
5898 while (annex
[0] != '\0')
5904 sep
= strchr (annex
, '=');
5909 if (len
== 5 && startswith (annex
, "start"))
5911 else if (len
== 4 && startswith (annex
, "prev"))
5915 annex
= strchr (sep
, ';');
5922 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5929 if (priv
->r_debug
== 0)
5930 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5932 /* We failed to find DT_DEBUG. Such situation will not change
5933 for this inferior - do not retry it. Report it to GDB as
5934 E01, see for the reasons at the GDB solib-svr4.c side. */
5935 if (priv
->r_debug
== (CORE_ADDR
) -1)
5938 if (priv
->r_debug
!= 0)
5940 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5941 (unsigned char *) &r_version
,
5942 sizeof (r_version
)) != 0
5945 warning ("unexpected r_debug version %d", r_version
);
5947 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5948 &lm_addr
, ptr_size
) != 0)
5950 warning ("unable to read r_map from 0x%lx",
5951 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5956 document
= xmalloc (allocated
);
5957 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5958 p
= document
+ strlen (document
);
5961 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5962 &l_name
, ptr_size
) == 0
5963 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5964 &l_addr
, ptr_size
) == 0
5965 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5966 &l_ld
, ptr_size
) == 0
5967 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5968 &l_prev
, ptr_size
) == 0
5969 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5970 &l_next
, ptr_size
) == 0)
5972 unsigned char libname
[PATH_MAX
];
5974 if (lm_prev
!= l_prev
)
5976 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5977 (long) lm_prev
, (long) l_prev
);
5981 /* Ignore the first entry even if it has valid name as the first entry
5982 corresponds to the main executable. The first entry should not be
5983 skipped if the dynamic loader was loaded late by a static executable
5984 (see solib-svr4.c parameter ignore_first). But in such case the main
5985 executable does not have PT_DYNAMIC present and this function already
5986 exited above due to failed get_r_debug. */
5989 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5994 /* Not checking for error because reading may stop before
5995 we've got PATH_MAX worth of characters. */
5997 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5998 libname
[sizeof (libname
) - 1] = '\0';
5999 if (libname
[0] != '\0')
6001 /* 6x the size for xml_escape_text below. */
6002 size_t len
= 6 * strlen ((char *) libname
);
6007 /* Terminate `<library-list-svr4'. */
6012 while (allocated
< p
- document
+ len
+ 200)
6014 /* Expand to guarantee sufficient storage. */
6015 uintptr_t document_len
= p
- document
;
6017 document
= xrealloc (document
, 2 * allocated
);
6019 p
= document
+ document_len
;
6022 name
= xml_escape_text ((char *) libname
);
6023 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6024 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
6025 name
, (unsigned long) lm_addr
,
6026 (unsigned long) l_addr
, (unsigned long) l_ld
);
6037 /* Empty list; terminate `<library-list-svr4'. */
6041 strcpy (p
, "</library-list-svr4>");
6043 document_len
= strlen (document
);
6044 if (offset
< document_len
)
6045 document_len
-= offset
;
6048 if (len
> document_len
)
6051 memcpy (readbuf
, document
+ offset
, len
);
6057 #ifdef HAVE_LINUX_BTRACE
6059 /* See to_enable_btrace target method. */
6061 static struct btrace_target_info
*
6062 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
6064 struct btrace_target_info
*tinfo
;
6066 tinfo
= linux_enable_btrace (ptid
, conf
);
6068 if (tinfo
!= NULL
&& tinfo
->ptr_bits
== 0)
6070 struct thread_info
*thread
= find_thread_ptid (ptid
);
6071 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
6073 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
6079 /* See to_disable_btrace target method. */
6082 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6084 enum btrace_error err
;
6086 err
= linux_disable_btrace (tinfo
);
6087 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6090 /* See to_read_btrace target method. */
6093 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6096 struct btrace_data btrace
;
6097 struct btrace_block
*block
;
6098 enum btrace_error err
;
6101 btrace_data_init (&btrace
);
6103 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6104 if (err
!= BTRACE_ERR_NONE
)
6106 if (err
== BTRACE_ERR_OVERFLOW
)
6107 buffer_grow_str0 (buffer
, "E.Overflow.");
6109 buffer_grow_str0 (buffer
, "E.Generic Error.");
6111 btrace_data_fini (&btrace
);
6115 switch (btrace
.format
)
6117 case BTRACE_FORMAT_NONE
:
6118 buffer_grow_str0 (buffer
, "E.No Trace.");
6121 case BTRACE_FORMAT_BTS
:
6122 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6123 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6126 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6128 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6129 paddress (block
->begin
), paddress (block
->end
));
6131 buffer_grow_str0 (buffer
, "</btrace>\n");
6135 buffer_grow_str0 (buffer
, "E.Unknown Trace Format.");
6137 btrace_data_fini (&btrace
);
6141 btrace_data_fini (&btrace
);
6145 /* See to_btrace_conf target method. */
6148 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6149 struct buffer
*buffer
)
6151 const struct btrace_config
*conf
;
6153 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6154 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6156 conf
= linux_btrace_conf (tinfo
);
6159 switch (conf
->format
)
6161 case BTRACE_FORMAT_NONE
:
6164 case BTRACE_FORMAT_BTS
:
6165 buffer_xml_printf (buffer
, "<bts");
6166 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6167 buffer_xml_printf (buffer
, " />\n");
6172 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6175 #endif /* HAVE_LINUX_BTRACE */
6177 static struct target_ops linux_target_ops
= {
6178 linux_create_inferior
,
6187 linux_fetch_registers
,
6188 linux_store_registers
,
6189 linux_prepare_to_access_memory
,
6190 linux_done_accessing_memory
,
6193 linux_look_up_symbols
,
6194 linux_request_interrupt
,
6196 linux_supports_z_point_type
,
6199 linux_stopped_by_sw_breakpoint
,
6200 linux_supports_stopped_by_sw_breakpoint
,
6201 linux_stopped_by_hw_breakpoint
,
6202 linux_supports_stopped_by_hw_breakpoint
,
6203 linux_stopped_by_watchpoint
,
6204 linux_stopped_data_address
,
6205 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6206 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6207 && defined(PT_TEXT_END_ADDR)
6212 #ifdef USE_THREAD_DB
6213 thread_db_get_tls_address
,
6218 hostio_last_error_from_errno
,
6221 linux_supports_non_stop
,
6223 linux_start_non_stop
,
6224 linux_supports_multi_process
,
6225 #ifdef USE_THREAD_DB
6226 thread_db_handle_monitor_command
,
6230 linux_common_core_of_thread
,
6232 linux_process_qsupported
,
6233 linux_supports_tracepoints
,
6236 linux_thread_stopped
,
6240 linux_stabilize_threads
,
6241 linux_install_fast_tracepoint_jump_pad
,
6243 linux_supports_disable_randomization
,
6244 linux_get_min_fast_tracepoint_insn_len
,
6245 linux_qxfer_libraries_svr4
,
6246 linux_supports_agent
,
6247 #ifdef HAVE_LINUX_BTRACE
6248 linux_supports_btrace
,
6249 linux_low_enable_btrace
,
6250 linux_low_disable_btrace
,
6251 linux_low_read_btrace
,
6252 linux_low_btrace_conf
,
6260 linux_supports_range_stepping
,
6264 linux_init_signals ()
6266 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6267 to find what the cancel signal actually is. */
6268 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6269 signal (__SIGRTMIN
+1, SIG_IGN
);
6273 #ifdef HAVE_LINUX_REGSETS
6275 initialize_regsets_info (struct regsets_info
*info
)
6277 for (info
->num_regsets
= 0;
6278 info
->regsets
[info
->num_regsets
].size
>= 0;
6279 info
->num_regsets
++)
6285 initialize_low (void)
6287 struct sigaction sigchld_action
;
6288 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6289 set_target_ops (&linux_target_ops
);
6290 set_breakpoint_data (the_low_target
.breakpoint
,
6291 the_low_target
.breakpoint_len
);
6292 linux_init_signals ();
6293 linux_ptrace_init_warnings ();
6295 sigchld_action
.sa_handler
= sigchld_handler
;
6296 sigemptyset (&sigchld_action
.sa_mask
);
6297 sigchld_action
.sa_flags
= SA_RESTART
;
6298 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6300 initialize_low_arch ();