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
;
497 if (the_low_target
.get_pc
== NULL
)
501 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
503 /* breakpoint_at reads from the current thread. */
504 saved_thread
= current_thread
;
505 current_thread
= get_lwp_thread (lwp
);
507 /* We may have just stepped a breakpoint instruction. E.g., in
508 non-stop mode, GDB first tells the thread A to step a range, and
509 then the user inserts a breakpoint inside the range. In that
510 case we need to report the breakpoint PC. */
511 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
512 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
516 struct thread_info
*thr
= get_lwp_thread (lwp
);
518 debug_printf ("CSBB: %s stopped by software breakpoint\n",
519 target_pid_to_str (ptid_of (thr
)));
522 /* Back up the PC if necessary. */
523 if (pc
!= sw_breakpoint_pc
)
525 struct regcache
*regcache
526 = get_thread_regcache (current_thread
, 1);
527 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
530 lwp
->stop_pc
= sw_breakpoint_pc
;
531 lwp
->stop_reason
= LWP_STOPPED_BY_SW_BREAKPOINT
;
532 current_thread
= saved_thread
;
536 if (hardware_breakpoint_inserted_here (pc
))
540 struct thread_info
*thr
= get_lwp_thread (lwp
);
542 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
543 target_pid_to_str (ptid_of (thr
)));
547 lwp
->stop_reason
= LWP_STOPPED_BY_HW_BREAKPOINT
;
548 current_thread
= saved_thread
;
552 current_thread
= saved_thread
;
556 static struct lwp_info
*
557 add_lwp (ptid_t ptid
)
559 struct lwp_info
*lwp
;
561 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
562 memset (lwp
, 0, sizeof (*lwp
));
564 if (the_low_target
.new_thread
!= NULL
)
565 lwp
->arch_private
= the_low_target
.new_thread ();
567 lwp
->thread
= add_thread (ptid
, lwp
);
572 /* Start an inferior process and returns its pid.
573 ALLARGS is a vector of program-name and args. */
576 linux_create_inferior (char *program
, char **allargs
)
578 struct lwp_info
*new_lwp
;
581 struct cleanup
*restore_personality
582 = maybe_disable_address_space_randomization (disable_randomization
);
584 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
590 perror_with_name ("fork");
595 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
597 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
598 signal (__SIGRTMIN
+ 1, SIG_DFL
);
603 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
604 stdout to stderr so that inferior i/o doesn't corrupt the connection.
605 Also, redirect stdin to /dev/null. */
606 if (remote_connection_is_stdio ())
609 open ("/dev/null", O_RDONLY
);
611 if (write (2, "stdin/stdout redirected\n",
612 sizeof ("stdin/stdout redirected\n") - 1) < 0)
614 /* Errors ignored. */;
618 execv (program
, allargs
);
620 execvp (program
, allargs
);
622 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
628 do_cleanups (restore_personality
);
630 linux_add_process (pid
, 0);
632 ptid
= ptid_build (pid
, pid
, 0);
633 new_lwp
= add_lwp (ptid
);
634 new_lwp
->must_set_ptrace_flags
= 1;
639 /* Attach to an inferior process. Returns 0 on success, ERRNO on
643 linux_attach_lwp (ptid_t ptid
)
645 struct lwp_info
*new_lwp
;
646 int lwpid
= ptid_get_lwp (ptid
);
648 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
652 new_lwp
= add_lwp (ptid
);
654 /* We need to wait for SIGSTOP before being able to make the next
655 ptrace call on this LWP. */
656 new_lwp
->must_set_ptrace_flags
= 1;
658 if (linux_proc_pid_is_stopped (lwpid
))
661 debug_printf ("Attached to a stopped process\n");
663 /* The process is definitely stopped. It is in a job control
664 stop, unless the kernel predates the TASK_STOPPED /
665 TASK_TRACED distinction, in which case it might be in a
666 ptrace stop. Make sure it is in a ptrace stop; from there we
667 can kill it, signal it, et cetera.
669 First make sure there is a pending SIGSTOP. Since we are
670 already attached, the process can not transition from stopped
671 to running without a PTRACE_CONT; so we know this signal will
672 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
673 probably already in the queue (unless this kernel is old
674 enough to use TASK_STOPPED for ptrace stops); but since
675 SIGSTOP is not an RT signal, it can only be queued once. */
676 kill_lwp (lwpid
, SIGSTOP
);
678 /* Finally, resume the stopped process. This will deliver the
679 SIGSTOP (or a higher priority signal, just like normal
680 PTRACE_ATTACH), which we'll catch later on. */
681 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
684 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
687 There are several cases to consider here:
689 1) gdbserver has already attached to the process and is being notified
690 of a new thread that is being created.
691 In this case we should ignore that SIGSTOP and resume the
692 process. This is handled below by setting stop_expected = 1,
693 and the fact that add_thread sets last_resume_kind ==
696 2) This is the first thread (the process thread), and we're attaching
697 to it via attach_inferior.
698 In this case we want the process thread to stop.
699 This is handled by having linux_attach set last_resume_kind ==
700 resume_stop after we return.
702 If the pid we are attaching to is also the tgid, we attach to and
703 stop all the existing threads. Otherwise, we attach to pid and
704 ignore any other threads in the same group as this pid.
706 3) GDB is connecting to gdbserver and is requesting an enumeration of all
708 In this case we want the thread to stop.
709 FIXME: This case is currently not properly handled.
710 We should wait for the SIGSTOP but don't. Things work apparently
711 because enough time passes between when we ptrace (ATTACH) and when
712 gdb makes the next ptrace call on the thread.
714 On the other hand, if we are currently trying to stop all threads, we
715 should treat the new thread as if we had sent it a SIGSTOP. This works
716 because we are guaranteed that the add_lwp call above added us to the
717 end of the list, and so the new thread has not yet reached
718 wait_for_sigstop (but will). */
719 new_lwp
->stop_expected
= 1;
724 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
725 already attached. Returns true if a new LWP is found, false
729 attach_proc_task_lwp_callback (ptid_t ptid
)
731 /* Is this a new thread? */
732 if (find_thread_ptid (ptid
) == NULL
)
734 int lwpid
= ptid_get_lwp (ptid
);
738 debug_printf ("Found new lwp %d\n", lwpid
);
740 err
= linux_attach_lwp (ptid
);
742 /* Be quiet if we simply raced with the thread exiting. EPERM
743 is returned if the thread's task still exists, and is marked
744 as exited or zombie, as well as other conditions, so in that
745 case, confirm the status in /proc/PID/status. */
747 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
751 debug_printf ("Cannot attach to lwp %d: "
752 "thread is gone (%d: %s)\n",
753 lwpid
, err
, strerror (err
));
758 warning (_("Cannot attach to lwp %d: %s"),
760 linux_ptrace_attach_fail_reason_string (ptid
, err
));
768 /* Attach to PID. If PID is the tgid, attach to it and all
772 linux_attach (unsigned long pid
)
774 ptid_t ptid
= ptid_build (pid
, pid
, 0);
777 /* Attach to PID. We will check for other threads
779 err
= linux_attach_lwp (ptid
);
781 error ("Cannot attach to process %ld: %s",
782 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
784 linux_add_process (pid
, 1);
788 struct thread_info
*thread
;
790 /* Don't ignore the initial SIGSTOP if we just attached to this
791 process. It will be collected by wait shortly. */
792 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
793 thread
->last_resume_kind
= resume_stop
;
796 /* We must attach to every LWP. If /proc is mounted, use that to
797 find them now. On the one hand, the inferior may be using raw
798 clone instead of using pthreads. On the other hand, even if it
799 is using pthreads, GDB may not be connected yet (thread_db needs
800 to do symbol lookups, through qSymbol). Also, thread_db walks
801 structures in the inferior's address space to find the list of
802 threads/LWPs, and those structures may well be corrupted. Note
803 that once thread_db is loaded, we'll still use it to list threads
804 and associate pthread info with each LWP. */
805 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
816 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
818 struct counter
*counter
= args
;
820 if (ptid_get_pid (entry
->id
) == counter
->pid
)
822 if (++counter
->count
> 1)
830 last_thread_of_process_p (int pid
)
832 struct counter counter
= { pid
, 0 };
834 return (find_inferior (&all_threads
,
835 second_thread_of_pid_p
, &counter
) == NULL
);
841 linux_kill_one_lwp (struct lwp_info
*lwp
)
843 struct thread_info
*thr
= get_lwp_thread (lwp
);
844 int pid
= lwpid_of (thr
);
846 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
847 there is no signal context, and ptrace(PTRACE_KILL) (or
848 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
849 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
850 alternative is to kill with SIGKILL. We only need one SIGKILL
851 per process, not one for each thread. But since we still support
852 linuxthreads, and we also support debugging programs using raw
853 clone without CLONE_THREAD, we send one for each thread. For
854 years, we used PTRACE_KILL only, so we're being a bit paranoid
855 about some old kernels where PTRACE_KILL might work better
856 (dubious if there are any such, but that's why it's paranoia), so
857 we try SIGKILL first, PTRACE_KILL second, and so we're fine
861 kill_lwp (pid
, SIGKILL
);
864 int save_errno
= errno
;
866 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
867 target_pid_to_str (ptid_of (thr
)),
868 save_errno
? strerror (save_errno
) : "OK");
872 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
875 int save_errno
= errno
;
877 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
878 target_pid_to_str (ptid_of (thr
)),
879 save_errno
? strerror (save_errno
) : "OK");
883 /* Kill LWP and wait for it to die. */
886 kill_wait_lwp (struct lwp_info
*lwp
)
888 struct thread_info
*thr
= get_lwp_thread (lwp
);
889 int pid
= ptid_get_pid (ptid_of (thr
));
890 int lwpid
= ptid_get_lwp (ptid_of (thr
));
895 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
899 linux_kill_one_lwp (lwp
);
901 /* Make sure it died. Notes:
903 - The loop is most likely unnecessary.
905 - We don't use linux_wait_for_event as that could delete lwps
906 while we're iterating over them. We're not interested in
907 any pending status at this point, only in making sure all
908 wait status on the kernel side are collected until the
911 - We don't use __WALL here as the __WALL emulation relies on
912 SIGCHLD, and killing a stopped process doesn't generate
913 one, nor an exit status.
915 res
= my_waitpid (lwpid
, &wstat
, 0);
916 if (res
== -1 && errno
== ECHILD
)
917 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
918 } while (res
> 0 && WIFSTOPPED (wstat
));
920 gdb_assert (res
> 0);
923 /* Callback for `find_inferior'. Kills an lwp of a given process,
924 except the leader. */
927 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
929 struct thread_info
*thread
= (struct thread_info
*) entry
;
930 struct lwp_info
*lwp
= get_thread_lwp (thread
);
931 int pid
= * (int *) args
;
933 if (ptid_get_pid (entry
->id
) != pid
)
936 /* We avoid killing the first thread here, because of a Linux kernel (at
937 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
938 the children get a chance to be reaped, it will remain a zombie
941 if (lwpid_of (thread
) == pid
)
944 debug_printf ("lkop: is last of process %s\n",
945 target_pid_to_str (entry
->id
));
956 struct process_info
*process
;
957 struct lwp_info
*lwp
;
959 process
= find_process_pid (pid
);
963 /* If we're killing a running inferior, make sure it is stopped
964 first, as PTRACE_KILL will not work otherwise. */
965 stop_all_lwps (0, NULL
);
967 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
969 /* See the comment in linux_kill_one_lwp. We did not kill the first
970 thread in the list, so do so now. */
971 lwp
= find_lwp_pid (pid_to_ptid (pid
));
976 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
982 the_target
->mourn (process
);
984 /* Since we presently can only stop all lwps of all processes, we
985 need to unstop lwps of other processes. */
986 unstop_all_lwps (0, NULL
);
990 /* Get pending signal of THREAD, for detaching purposes. This is the
991 signal the thread last stopped for, which we need to deliver to the
992 thread when detaching, otherwise, it'd be suppressed/lost. */
995 get_detach_signal (struct thread_info
*thread
)
997 enum gdb_signal signo
= GDB_SIGNAL_0
;
999 struct lwp_info
*lp
= get_thread_lwp (thread
);
1001 if (lp
->status_pending_p
)
1002 status
= lp
->status_pending
;
1005 /* If the thread had been suspended by gdbserver, and it stopped
1006 cleanly, then it'll have stopped with SIGSTOP. But we don't
1007 want to deliver that SIGSTOP. */
1008 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1009 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1012 /* Otherwise, we may need to deliver the signal we
1014 status
= lp
->last_status
;
1017 if (!WIFSTOPPED (status
))
1020 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1021 target_pid_to_str (ptid_of (thread
)));
1025 /* Extended wait statuses aren't real SIGTRAPs. */
1026 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1029 debug_printf ("GPS: lwp %s had stopped with extended "
1030 "status: no pending signal\n",
1031 target_pid_to_str (ptid_of (thread
)));
1035 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1037 if (program_signals_p
&& !program_signals
[signo
])
1040 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1041 target_pid_to_str (ptid_of (thread
)),
1042 gdb_signal_to_string (signo
));
1045 else if (!program_signals_p
1046 /* If we have no way to know which signals GDB does not
1047 want to have passed to the program, assume
1048 SIGTRAP/SIGINT, which is GDB's default. */
1049 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1052 debug_printf ("GPS: lwp %s had signal %s, "
1053 "but we don't know if we should pass it. "
1054 "Default to not.\n",
1055 target_pid_to_str (ptid_of (thread
)),
1056 gdb_signal_to_string (signo
));
1062 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1063 target_pid_to_str (ptid_of (thread
)),
1064 gdb_signal_to_string (signo
));
1066 return WSTOPSIG (status
);
1071 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1073 struct thread_info
*thread
= (struct thread_info
*) entry
;
1074 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1075 int pid
= * (int *) args
;
1078 if (ptid_get_pid (entry
->id
) != pid
)
1081 /* If there is a pending SIGSTOP, get rid of it. */
1082 if (lwp
->stop_expected
)
1085 debug_printf ("Sending SIGCONT to %s\n",
1086 target_pid_to_str (ptid_of (thread
)));
1088 kill_lwp (lwpid_of (thread
), SIGCONT
);
1089 lwp
->stop_expected
= 0;
1092 /* Flush any pending changes to the process's registers. */
1093 regcache_invalidate_thread (thread
);
1095 /* Pass on any pending signal for this thread. */
1096 sig
= get_detach_signal (thread
);
1098 /* Finally, let it resume. */
1099 if (the_low_target
.prepare_to_resume
!= NULL
)
1100 the_low_target
.prepare_to_resume (lwp
);
1101 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1102 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1103 error (_("Can't detach %s: %s"),
1104 target_pid_to_str (ptid_of (thread
)),
1112 linux_detach (int pid
)
1114 struct process_info
*process
;
1116 process
= find_process_pid (pid
);
1117 if (process
== NULL
)
1120 /* Stop all threads before detaching. First, ptrace requires that
1121 the thread is stopped to sucessfully detach. Second, thread_db
1122 may need to uninstall thread event breakpoints from memory, which
1123 only works with a stopped process anyway. */
1124 stop_all_lwps (0, NULL
);
1126 #ifdef USE_THREAD_DB
1127 thread_db_detach (process
);
1130 /* Stabilize threads (move out of jump pads). */
1131 stabilize_threads ();
1133 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1135 the_target
->mourn (process
);
1137 /* Since we presently can only stop all lwps of all processes, we
1138 need to unstop lwps of other processes. */
1139 unstop_all_lwps (0, NULL
);
1143 /* Remove all LWPs that belong to process PROC from the lwp list. */
1146 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1148 struct thread_info
*thread
= (struct thread_info
*) entry
;
1149 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1150 struct process_info
*process
= proc
;
1152 if (pid_of (thread
) == pid_of (process
))
1159 linux_mourn (struct process_info
*process
)
1161 struct process_info_private
*priv
;
1163 #ifdef USE_THREAD_DB
1164 thread_db_mourn (process
);
1167 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1169 /* Freeing all private data. */
1170 priv
= process
->priv
;
1171 free (priv
->arch_private
);
1173 process
->priv
= NULL
;
1175 remove_process (process
);
1179 linux_join (int pid
)
1184 ret
= my_waitpid (pid
, &status
, 0);
1185 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1187 } while (ret
!= -1 || errno
!= ECHILD
);
1190 /* Return nonzero if the given thread is still alive. */
1192 linux_thread_alive (ptid_t ptid
)
1194 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1196 /* We assume we always know if a thread exits. If a whole process
1197 exited but we still haven't been able to report it to GDB, we'll
1198 hold on to the last lwp of the dead process. */
1205 /* Return 1 if this lwp still has an interesting status pending. If
1206 not (e.g., it had stopped for a breakpoint that is gone), return
1210 thread_still_has_status_pending_p (struct thread_info
*thread
)
1212 struct lwp_info
*lp
= get_thread_lwp (thread
);
1214 if (!lp
->status_pending_p
)
1217 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1218 report any status pending the LWP may have. */
1219 if (thread
->last_resume_kind
== resume_stop
1220 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1223 if (thread
->last_resume_kind
!= resume_stop
1224 && (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1225 || lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
))
1227 struct thread_info
*saved_thread
;
1231 gdb_assert (lp
->last_status
!= 0);
1235 saved_thread
= current_thread
;
1236 current_thread
= thread
;
1238 if (pc
!= lp
->stop_pc
)
1241 debug_printf ("PC of %ld changed\n",
1245 else if (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1246 && !(*the_low_target
.breakpoint_at
) (pc
))
1249 debug_printf ("previous SW breakpoint of %ld gone\n",
1253 else if (lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
1254 && !hardware_breakpoint_inserted_here (pc
))
1257 debug_printf ("previous HW breakpoint of %ld gone\n",
1262 current_thread
= saved_thread
;
1267 debug_printf ("discarding pending breakpoint status\n");
1268 lp
->status_pending_p
= 0;
1276 /* Return 1 if this lwp has an interesting status pending. */
1278 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1280 struct thread_info
*thread
= (struct thread_info
*) entry
;
1281 struct lwp_info
*lp
= get_thread_lwp (thread
);
1282 ptid_t ptid
= * (ptid_t
*) arg
;
1284 /* Check if we're only interested in events from a specific process
1285 or a specific LWP. */
1286 if (!ptid_match (ptid_of (thread
), ptid
))
1289 if (lp
->status_pending_p
1290 && !thread_still_has_status_pending_p (thread
))
1292 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1296 return lp
->status_pending_p
;
1300 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1302 ptid_t ptid
= *(ptid_t
*) data
;
1305 if (ptid_get_lwp (ptid
) != 0)
1306 lwp
= ptid_get_lwp (ptid
);
1308 lwp
= ptid_get_pid (ptid
);
1310 if (ptid_get_lwp (entry
->id
) == lwp
)
1317 find_lwp_pid (ptid_t ptid
)
1319 struct inferior_list_entry
*thread
1320 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1325 return get_thread_lwp ((struct thread_info
*) thread
);
1328 /* Return the number of known LWPs in the tgid given by PID. */
1333 struct inferior_list_entry
*inf
, *tmp
;
1336 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1338 if (ptid_get_pid (inf
->id
) == pid
)
1345 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1346 their exits until all other threads in the group have exited. */
1349 check_zombie_leaders (void)
1351 struct process_info
*proc
, *tmp
;
1353 ALL_PROCESSES (proc
, tmp
)
1355 pid_t leader_pid
= pid_of (proc
);
1356 struct lwp_info
*leader_lp
;
1358 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1361 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1362 "num_lwps=%d, zombie=%d\n",
1363 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1364 linux_proc_pid_is_zombie (leader_pid
));
1366 if (leader_lp
!= NULL
1367 /* Check if there are other threads in the group, as we may
1368 have raced with the inferior simply exiting. */
1369 && !last_thread_of_process_p (leader_pid
)
1370 && linux_proc_pid_is_zombie (leader_pid
))
1372 /* A leader zombie can mean one of two things:
1374 - It exited, and there's an exit status pending
1375 available, or only the leader exited (not the whole
1376 program). In the latter case, we can't waitpid the
1377 leader's exit status until all other threads are gone.
1379 - There are 3 or more threads in the group, and a thread
1380 other than the leader exec'd. On an exec, the Linux
1381 kernel destroys all other threads (except the execing
1382 one) in the thread group, and resets the execing thread's
1383 tid to the tgid. No exit notification is sent for the
1384 execing thread -- from the ptracer's perspective, it
1385 appears as though the execing thread just vanishes.
1386 Until we reap all other threads except the leader and the
1387 execing thread, the leader will be zombie, and the
1388 execing thread will be in `D (disc sleep)'. As soon as
1389 all other threads are reaped, the execing thread changes
1390 it's tid to the tgid, and the previous (zombie) leader
1391 vanishes, giving place to the "new" leader. We could try
1392 distinguishing the exit and exec cases, by waiting once
1393 more, and seeing if something comes out, but it doesn't
1394 sound useful. The previous leader _does_ go away, and
1395 we'll re-add the new one once we see the exec event
1396 (which is just the same as what would happen if the
1397 previous leader did exit voluntarily before some other
1402 "CZL: Thread group leader %d zombie "
1403 "(it exited, or another thread execd).\n",
1406 delete_lwp (leader_lp
);
1411 /* Callback for `find_inferior'. Returns the first LWP that is not
1412 stopped. ARG is a PTID filter. */
1415 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1417 struct thread_info
*thr
= (struct thread_info
*) entry
;
1418 struct lwp_info
*lwp
;
1419 ptid_t filter
= *(ptid_t
*) arg
;
1421 if (!ptid_match (ptid_of (thr
), filter
))
1424 lwp
= get_thread_lwp (thr
);
1431 /* This function should only be called if the LWP got a SIGTRAP.
1433 Handle any tracepoint steps or hits. Return true if a tracepoint
1434 event was handled, 0 otherwise. */
1437 handle_tracepoints (struct lwp_info
*lwp
)
1439 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1440 int tpoint_related_event
= 0;
1442 gdb_assert (lwp
->suspended
== 0);
1444 /* If this tracepoint hit causes a tracing stop, we'll immediately
1445 uninsert tracepoints. To do this, we temporarily pause all
1446 threads, unpatch away, and then unpause threads. We need to make
1447 sure the unpausing doesn't resume LWP too. */
1450 /* And we need to be sure that any all-threads-stopping doesn't try
1451 to move threads out of the jump pads, as it could deadlock the
1452 inferior (LWP could be in the jump pad, maybe even holding the
1455 /* Do any necessary step collect actions. */
1456 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1458 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1460 /* See if we just hit a tracepoint and do its main collect
1462 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1466 gdb_assert (lwp
->suspended
== 0);
1467 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1469 if (tpoint_related_event
)
1472 debug_printf ("got a tracepoint event\n");
1479 /* Convenience wrapper. Returns true if LWP is presently collecting a
1483 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1484 struct fast_tpoint_collect_status
*status
)
1486 CORE_ADDR thread_area
;
1487 struct thread_info
*thread
= get_lwp_thread (lwp
);
1489 if (the_low_target
.get_thread_area
== NULL
)
1492 /* Get the thread area address. This is used to recognize which
1493 thread is which when tracing with the in-process agent library.
1494 We don't read anything from the address, and treat it as opaque;
1495 it's the address itself that we assume is unique per-thread. */
1496 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1499 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1502 /* The reason we resume in the caller, is because we want to be able
1503 to pass lwp->status_pending as WSTAT, and we need to clear
1504 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1505 refuses to resume. */
1508 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1510 struct thread_info
*saved_thread
;
1512 saved_thread
= current_thread
;
1513 current_thread
= get_lwp_thread (lwp
);
1516 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1517 && supports_fast_tracepoints ()
1518 && agent_loaded_p ())
1520 struct fast_tpoint_collect_status status
;
1524 debug_printf ("Checking whether LWP %ld needs to move out of the "
1526 lwpid_of (current_thread
));
1528 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1531 || (WSTOPSIG (*wstat
) != SIGILL
1532 && WSTOPSIG (*wstat
) != SIGFPE
1533 && WSTOPSIG (*wstat
) != SIGSEGV
1534 && WSTOPSIG (*wstat
) != SIGBUS
))
1536 lwp
->collecting_fast_tracepoint
= r
;
1540 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1542 /* Haven't executed the original instruction yet.
1543 Set breakpoint there, and wait till it's hit,
1544 then single-step until exiting the jump pad. */
1545 lwp
->exit_jump_pad_bkpt
1546 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1550 debug_printf ("Checking whether LWP %ld needs to move out of "
1551 "the jump pad...it does\n",
1552 lwpid_of (current_thread
));
1553 current_thread
= saved_thread
;
1560 /* If we get a synchronous signal while collecting, *and*
1561 while executing the (relocated) original instruction,
1562 reset the PC to point at the tpoint address, before
1563 reporting to GDB. Otherwise, it's an IPA lib bug: just
1564 report the signal to GDB, and pray for the best. */
1566 lwp
->collecting_fast_tracepoint
= 0;
1569 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1570 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1573 struct regcache
*regcache
;
1575 /* The si_addr on a few signals references the address
1576 of the faulting instruction. Adjust that as
1578 if ((WSTOPSIG (*wstat
) == SIGILL
1579 || WSTOPSIG (*wstat
) == SIGFPE
1580 || WSTOPSIG (*wstat
) == SIGBUS
1581 || WSTOPSIG (*wstat
) == SIGSEGV
)
1582 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1583 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1584 /* Final check just to make sure we don't clobber
1585 the siginfo of non-kernel-sent signals. */
1586 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1588 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1589 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1590 (PTRACE_TYPE_ARG3
) 0, &info
);
1593 regcache
= get_thread_regcache (current_thread
, 1);
1594 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1595 lwp
->stop_pc
= status
.tpoint_addr
;
1597 /* Cancel any fast tracepoint lock this thread was
1599 force_unlock_trace_buffer ();
1602 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1605 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1606 "stopping all threads momentarily.\n");
1608 stop_all_lwps (1, lwp
);
1610 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1611 lwp
->exit_jump_pad_bkpt
= NULL
;
1613 unstop_all_lwps (1, lwp
);
1615 gdb_assert (lwp
->suspended
>= 0);
1621 debug_printf ("Checking whether LWP %ld needs to move out of the "
1623 lwpid_of (current_thread
));
1625 current_thread
= saved_thread
;
1629 /* Enqueue one signal in the "signals to report later when out of the
1633 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1635 struct pending_signals
*p_sig
;
1636 struct thread_info
*thread
= get_lwp_thread (lwp
);
1639 debug_printf ("Deferring signal %d for LWP %ld.\n",
1640 WSTOPSIG (*wstat
), lwpid_of (thread
));
1644 struct pending_signals
*sig
;
1646 for (sig
= lwp
->pending_signals_to_report
;
1649 debug_printf (" Already queued %d\n",
1652 debug_printf (" (no more currently queued signals)\n");
1655 /* Don't enqueue non-RT signals if they are already in the deferred
1656 queue. (SIGSTOP being the easiest signal to see ending up here
1658 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1660 struct pending_signals
*sig
;
1662 for (sig
= lwp
->pending_signals_to_report
;
1666 if (sig
->signal
== WSTOPSIG (*wstat
))
1669 debug_printf ("Not requeuing already queued non-RT signal %d"
1678 p_sig
= xmalloc (sizeof (*p_sig
));
1679 p_sig
->prev
= lwp
->pending_signals_to_report
;
1680 p_sig
->signal
= WSTOPSIG (*wstat
);
1681 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1682 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1685 lwp
->pending_signals_to_report
= p_sig
;
1688 /* Dequeue one signal from the "signals to report later when out of
1689 the jump pad" list. */
1692 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1694 struct thread_info
*thread
= get_lwp_thread (lwp
);
1696 if (lwp
->pending_signals_to_report
!= NULL
)
1698 struct pending_signals
**p_sig
;
1700 p_sig
= &lwp
->pending_signals_to_report
;
1701 while ((*p_sig
)->prev
!= NULL
)
1702 p_sig
= &(*p_sig
)->prev
;
1704 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1705 if ((*p_sig
)->info
.si_signo
!= 0)
1706 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1712 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1713 WSTOPSIG (*wstat
), lwpid_of (thread
));
1717 struct pending_signals
*sig
;
1719 for (sig
= lwp
->pending_signals_to_report
;
1722 debug_printf (" Still queued %d\n",
1725 debug_printf (" (no more queued signals)\n");
1734 /* Fetch the possibly triggered data watchpoint info and store it in
1737 On some archs, like x86, that use debug registers to set
1738 watchpoints, it's possible that the way to know which watched
1739 address trapped, is to check the register that is used to select
1740 which address to watch. Problem is, between setting the watchpoint
1741 and reading back which data address trapped, the user may change
1742 the set of watchpoints, and, as a consequence, GDB changes the
1743 debug registers in the inferior. To avoid reading back a stale
1744 stopped-data-address when that happens, we cache in LP the fact
1745 that a watchpoint trapped, and the corresponding data address, as
1746 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1747 registers meanwhile, we have the cached data we can rely on. */
1750 check_stopped_by_watchpoint (struct lwp_info
*child
)
1752 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1754 struct thread_info
*saved_thread
;
1756 saved_thread
= current_thread
;
1757 current_thread
= get_lwp_thread (child
);
1759 if (the_low_target
.stopped_by_watchpoint ())
1761 child
->stop_reason
= LWP_STOPPED_BY_WATCHPOINT
;
1763 if (the_low_target
.stopped_data_address
!= NULL
)
1764 child
->stopped_data_address
1765 = the_low_target
.stopped_data_address ();
1767 child
->stopped_data_address
= 0;
1770 current_thread
= saved_thread
;
1773 return child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
1776 /* Do low-level handling of the event, and check if we should go on
1777 and pass it to caller code. Return the affected lwp if we are, or
1780 static struct lwp_info
*
1781 linux_low_filter_event (int lwpid
, int wstat
)
1783 struct lwp_info
*child
;
1784 struct thread_info
*thread
;
1785 int have_stop_pc
= 0;
1787 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1789 /* If we didn't find a process, one of two things presumably happened:
1790 - A process we started and then detached from has exited. Ignore it.
1791 - A process we are controlling has forked and the new child's stop
1792 was reported to us by the kernel. Save its PID. */
1793 if (child
== NULL
&& WIFSTOPPED (wstat
))
1795 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1798 else if (child
== NULL
)
1801 thread
= get_lwp_thread (child
);
1805 child
->last_status
= wstat
;
1807 /* Check if the thread has exited. */
1808 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1811 debug_printf ("LLFE: %d exited.\n", lwpid
);
1812 if (num_lwps (pid_of (thread
)) > 1)
1815 /* If there is at least one more LWP, then the exit signal was
1816 not the end of the debugged application and should be
1823 /* This was the last lwp in the process. Since events are
1824 serialized to GDB core, and we can't report this one
1825 right now, but GDB core and the other target layers will
1826 want to be notified about the exit code/signal, leave the
1827 status pending for the next time we're able to report
1829 mark_lwp_dead (child
, wstat
);
1834 gdb_assert (WIFSTOPPED (wstat
));
1836 if (WIFSTOPPED (wstat
))
1838 struct process_info
*proc
;
1840 /* Architecture-specific setup after inferior is running. This
1841 needs to happen after we have attached to the inferior and it
1842 is stopped for the first time, but before we access any
1843 inferior registers. */
1844 proc
= find_process_pid (pid_of (thread
));
1845 if (proc
->priv
->new_inferior
)
1847 struct thread_info
*saved_thread
;
1849 saved_thread
= current_thread
;
1850 current_thread
= thread
;
1852 the_low_target
.arch_setup ();
1854 current_thread
= saved_thread
;
1856 proc
->priv
->new_inferior
= 0;
1860 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1862 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1864 linux_enable_event_reporting (lwpid
, proc
->attached
);
1865 child
->must_set_ptrace_flags
= 0;
1868 /* Be careful to not overwrite stop_pc until
1869 check_stopped_by_breakpoint is called. */
1870 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1871 && linux_is_extended_waitstatus (wstat
))
1873 child
->stop_pc
= get_pc (child
);
1874 handle_extended_wait (child
, wstat
);
1878 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1879 && check_stopped_by_watchpoint (child
))
1881 else if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
1883 if (check_stopped_by_breakpoint (child
))
1888 child
->stop_pc
= get_pc (child
);
1890 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1891 && child
->stop_expected
)
1894 debug_printf ("Expected stop.\n");
1895 child
->stop_expected
= 0;
1897 if (thread
->last_resume_kind
== resume_stop
)
1899 /* We want to report the stop to the core. Treat the
1900 SIGSTOP as a normal event. */
1902 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1904 /* Stopping threads. We don't want this SIGSTOP to end up
1910 /* Filter out the event. */
1911 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1916 child
->status_pending_p
= 1;
1917 child
->status_pending
= wstat
;
1921 /* Resume LWPs that are currently stopped without any pending status
1922 to report, but are resumed from the core's perspective. */
1925 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
1927 struct thread_info
*thread
= (struct thread_info
*) entry
;
1928 struct lwp_info
*lp
= get_thread_lwp (thread
);
1931 && !lp
->status_pending_p
1932 && thread
->last_resume_kind
!= resume_stop
1933 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1935 int step
= thread
->last_resume_kind
== resume_step
;
1938 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
1939 target_pid_to_str (ptid_of (thread
)),
1940 paddress (lp
->stop_pc
),
1943 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
1947 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1948 match FILTER_PTID (leaving others pending). The PTIDs can be:
1949 minus_one_ptid, to specify any child; a pid PTID, specifying all
1950 lwps of a thread group; or a PTID representing a single lwp. Store
1951 the stop status through the status pointer WSTAT. OPTIONS is
1952 passed to the waitpid call. Return 0 if no event was found and
1953 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1954 was found. Return the PID of the stopped child otherwise. */
1957 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1958 int *wstatp
, int options
)
1960 struct thread_info
*event_thread
;
1961 struct lwp_info
*event_child
, *requested_child
;
1962 sigset_t block_mask
, prev_mask
;
1965 /* N.B. event_thread points to the thread_info struct that contains
1966 event_child. Keep them in sync. */
1967 event_thread
= NULL
;
1969 requested_child
= NULL
;
1971 /* Check for a lwp with a pending status. */
1973 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
1975 event_thread
= (struct thread_info
*)
1976 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
1977 if (event_thread
!= NULL
)
1978 event_child
= get_thread_lwp (event_thread
);
1979 if (debug_threads
&& event_thread
)
1980 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
1982 else if (!ptid_equal (filter_ptid
, null_ptid
))
1984 requested_child
= find_lwp_pid (filter_ptid
);
1986 if (stopping_threads
== NOT_STOPPING_THREADS
1987 && requested_child
->status_pending_p
1988 && requested_child
->collecting_fast_tracepoint
)
1990 enqueue_one_deferred_signal (requested_child
,
1991 &requested_child
->status_pending
);
1992 requested_child
->status_pending_p
= 0;
1993 requested_child
->status_pending
= 0;
1994 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1997 if (requested_child
->suspended
1998 && requested_child
->status_pending_p
)
2000 internal_error (__FILE__
, __LINE__
,
2001 "requesting an event out of a"
2002 " suspended child?");
2005 if (requested_child
->status_pending_p
)
2007 event_child
= requested_child
;
2008 event_thread
= get_lwp_thread (event_child
);
2012 if (event_child
!= NULL
)
2015 debug_printf ("Got an event from pending child %ld (%04x)\n",
2016 lwpid_of (event_thread
), event_child
->status_pending
);
2017 *wstatp
= event_child
->status_pending
;
2018 event_child
->status_pending_p
= 0;
2019 event_child
->status_pending
= 0;
2020 current_thread
= event_thread
;
2021 return lwpid_of (event_thread
);
2024 /* But if we don't find a pending event, we'll have to wait.
2026 We only enter this loop if no process has a pending wait status.
2027 Thus any action taken in response to a wait status inside this
2028 loop is responding as soon as we detect the status, not after any
2031 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2032 all signals while here. */
2033 sigfillset (&block_mask
);
2034 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2036 /* Always pull all events out of the kernel. We'll randomly select
2037 an event LWP out of all that have events, to prevent
2039 while (event_child
== NULL
)
2043 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2046 - If the thread group leader exits while other threads in the
2047 thread group still exist, waitpid(TGID, ...) hangs. That
2048 waitpid won't return an exit status until the other threads
2049 in the group are reaped.
2051 - When a non-leader thread execs, that thread just vanishes
2052 without reporting an exit (so we'd hang if we waited for it
2053 explicitly in that case). The exec event is reported to
2054 the TGID pid (although we don't currently enable exec
2057 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2060 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2061 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2067 debug_printf ("LLW: waitpid %ld received %s\n",
2068 (long) ret
, status_to_str (*wstatp
));
2071 /* Filter all events. IOW, leave all events pending. We'll
2072 randomly select an event LWP out of all that have events
2074 linux_low_filter_event (ret
, *wstatp
);
2075 /* Retry until nothing comes out of waitpid. A single
2076 SIGCHLD can indicate more than one child stopped. */
2080 /* Now that we've pulled all events out of the kernel, resume
2081 LWPs that don't have an interesting event to report. */
2082 if (stopping_threads
== NOT_STOPPING_THREADS
)
2083 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2085 /* ... and find an LWP with a status to report to the core, if
2087 event_thread
= (struct thread_info
*)
2088 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2089 if (event_thread
!= NULL
)
2091 event_child
= get_thread_lwp (event_thread
);
2092 *wstatp
= event_child
->status_pending
;
2093 event_child
->status_pending_p
= 0;
2094 event_child
->status_pending
= 0;
2098 /* Check for zombie thread group leaders. Those can't be reaped
2099 until all other threads in the thread group are. */
2100 check_zombie_leaders ();
2102 /* If there are no resumed children left in the set of LWPs we
2103 want to wait for, bail. We can't just block in
2104 waitpid/sigsuspend, because lwps might have been left stopped
2105 in trace-stop state, and we'd be stuck forever waiting for
2106 their status to change (which would only happen if we resumed
2107 them). Even if WNOHANG is set, this return code is preferred
2108 over 0 (below), as it is more detailed. */
2109 if ((find_inferior (&all_threads
,
2110 not_stopped_callback
,
2111 &wait_ptid
) == NULL
))
2114 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2115 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2119 /* No interesting event to report to the caller. */
2120 if ((options
& WNOHANG
))
2123 debug_printf ("WNOHANG set, no event found\n");
2125 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2129 /* Block until we get an event reported with SIGCHLD. */
2131 debug_printf ("sigsuspend'ing\n");
2133 sigsuspend (&prev_mask
);
2134 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2138 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2140 current_thread
= event_thread
;
2142 /* Check for thread exit. */
2143 if (! WIFSTOPPED (*wstatp
))
2145 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2148 debug_printf ("LWP %d is the last lwp of process. "
2149 "Process %ld exiting.\n",
2150 pid_of (event_thread
), lwpid_of (event_thread
));
2151 return lwpid_of (event_thread
);
2154 return lwpid_of (event_thread
);
2157 /* Wait for an event from child(ren) PTID. PTIDs can be:
2158 minus_one_ptid, to specify any child; a pid PTID, specifying all
2159 lwps of a thread group; or a PTID representing a single lwp. Store
2160 the stop status through the status pointer WSTAT. OPTIONS is
2161 passed to the waitpid call. Return 0 if no event was found and
2162 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2163 was found. Return the PID of the stopped child otherwise. */
2166 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2168 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2171 /* Count the LWP's that have had events. */
2174 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2176 struct thread_info
*thread
= (struct thread_info
*) entry
;
2179 gdb_assert (count
!= NULL
);
2181 /* Count only resumed LWPs that have an event pending. */
2182 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2183 && thread
->last_resume_kind
!= resume_stop
2184 && thread
->status_pending_p
)
2190 /* Select the LWP (if any) that is currently being single-stepped. */
2193 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2195 struct thread_info
*thread
= (struct thread_info
*) entry
;
2196 struct lwp_info
*lp
= get_thread_lwp (thread
);
2198 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2199 && thread
->last_resume_kind
== resume_step
2200 && lp
->status_pending_p
)
2206 /* Select the Nth LWP that has had a SIGTRAP event that should be
2210 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2212 struct thread_info
*thread
= (struct thread_info
*) entry
;
2213 int *selector
= data
;
2215 gdb_assert (selector
!= NULL
);
2217 /* Select only resumed LWPs that have an event pending. */
2218 if (thread
->last_resume_kind
!= resume_stop
2219 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2220 && thread
->status_pending_p
)
2221 if ((*selector
)-- == 0)
2227 /* Select one LWP out of those that have events pending. */
2230 select_event_lwp (struct lwp_info
**orig_lp
)
2233 int random_selector
;
2234 struct thread_info
*event_thread
= NULL
;
2236 /* In all-stop, give preference to the LWP that is being
2237 single-stepped. There will be at most one, and it's the LWP that
2238 the core is most interested in. If we didn't do this, then we'd
2239 have to handle pending step SIGTRAPs somehow in case the core
2240 later continues the previously-stepped thread, otherwise we'd
2241 report the pending SIGTRAP, and the core, not having stepped the
2242 thread, wouldn't understand what the trap was for, and therefore
2243 would report it to the user as a random signal. */
2247 = (struct thread_info
*) find_inferior (&all_threads
,
2248 select_singlestep_lwp_callback
,
2250 if (event_thread
!= NULL
)
2253 debug_printf ("SEL: Select single-step %s\n",
2254 target_pid_to_str (ptid_of (event_thread
)));
2257 if (event_thread
== NULL
)
2259 /* No single-stepping LWP. Select one at random, out of those
2260 which have had SIGTRAP events. */
2262 /* First see how many SIGTRAP events we have. */
2263 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2265 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2266 random_selector
= (int)
2267 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2269 if (debug_threads
&& num_events
> 1)
2270 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2271 num_events
, random_selector
);
2274 = (struct thread_info
*) find_inferior (&all_threads
,
2275 select_event_lwp_callback
,
2279 if (event_thread
!= NULL
)
2281 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2283 /* Switch the event LWP. */
2284 *orig_lp
= event_lp
;
2288 /* Decrement the suspend count of an LWP. */
2291 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2293 struct thread_info
*thread
= (struct thread_info
*) entry
;
2294 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2296 /* Ignore EXCEPT. */
2302 gdb_assert (lwp
->suspended
>= 0);
2306 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2310 unsuspend_all_lwps (struct lwp_info
*except
)
2312 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2315 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2316 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2318 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2319 static ptid_t
linux_wait_1 (ptid_t ptid
,
2320 struct target_waitstatus
*ourstatus
,
2321 int target_options
);
2323 /* Stabilize threads (move out of jump pads).
2325 If a thread is midway collecting a fast tracepoint, we need to
2326 finish the collection and move it out of the jump pad before
2327 reporting the signal.
2329 This avoids recursion while collecting (when a signal arrives
2330 midway, and the signal handler itself collects), which would trash
2331 the trace buffer. In case the user set a breakpoint in a signal
2332 handler, this avoids the backtrace showing the jump pad, etc..
2333 Most importantly, there are certain things we can't do safely if
2334 threads are stopped in a jump pad (or in its callee's). For
2337 - starting a new trace run. A thread still collecting the
2338 previous run, could trash the trace buffer when resumed. The trace
2339 buffer control structures would have been reset but the thread had
2340 no way to tell. The thread could even midway memcpy'ing to the
2341 buffer, which would mean that when resumed, it would clobber the
2342 trace buffer that had been set for a new run.
2344 - we can't rewrite/reuse the jump pads for new tracepoints
2345 safely. Say you do tstart while a thread is stopped midway while
2346 collecting. When the thread is later resumed, it finishes the
2347 collection, and returns to the jump pad, to execute the original
2348 instruction that was under the tracepoint jump at the time the
2349 older run had been started. If the jump pad had been rewritten
2350 since for something else in the new run, the thread would now
2351 execute the wrong / random instructions. */
2354 linux_stabilize_threads (void)
2356 struct thread_info
*saved_thread
;
2357 struct thread_info
*thread_stuck
;
2360 = (struct thread_info
*) find_inferior (&all_threads
,
2361 stuck_in_jump_pad_callback
,
2363 if (thread_stuck
!= NULL
)
2366 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2367 lwpid_of (thread_stuck
));
2371 saved_thread
= current_thread
;
2373 stabilizing_threads
= 1;
2376 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2378 /* Loop until all are stopped out of the jump pads. */
2379 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2381 struct target_waitstatus ourstatus
;
2382 struct lwp_info
*lwp
;
2385 /* Note that we go through the full wait even loop. While
2386 moving threads out of jump pad, we need to be able to step
2387 over internal breakpoints and such. */
2388 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2390 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2392 lwp
= get_thread_lwp (current_thread
);
2397 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2398 || current_thread
->last_resume_kind
== resume_stop
)
2400 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2401 enqueue_one_deferred_signal (lwp
, &wstat
);
2406 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2408 stabilizing_threads
= 0;
2410 current_thread
= saved_thread
;
2415 = (struct thread_info
*) find_inferior (&all_threads
,
2416 stuck_in_jump_pad_callback
,
2418 if (thread_stuck
!= NULL
)
2419 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2420 lwpid_of (thread_stuck
));
2424 static void async_file_mark (void);
2426 /* Convenience function that is called when the kernel reports an
2427 event that is not passed out to GDB. */
2430 ignore_event (struct target_waitstatus
*ourstatus
)
2432 /* If we got an event, there may still be others, as a single
2433 SIGCHLD can indicate more than one child stopped. This forces
2434 another target_wait call. */
2437 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2441 /* Wait for process, returns status. */
2444 linux_wait_1 (ptid_t ptid
,
2445 struct target_waitstatus
*ourstatus
, int target_options
)
2448 struct lwp_info
*event_child
;
2451 int step_over_finished
;
2452 int bp_explains_trap
;
2453 int maybe_internal_trap
;
2461 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2464 /* Translate generic target options into linux options. */
2466 if (target_options
& TARGET_WNOHANG
)
2469 bp_explains_trap
= 0;
2472 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2474 if (ptid_equal (step_over_bkpt
, null_ptid
))
2475 pid
= linux_wait_for_event (ptid
, &w
, options
);
2479 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2480 target_pid_to_str (step_over_bkpt
));
2481 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2486 gdb_assert (target_options
& TARGET_WNOHANG
);
2490 debug_printf ("linux_wait_1 ret = null_ptid, "
2491 "TARGET_WAITKIND_IGNORE\n");
2495 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2502 debug_printf ("linux_wait_1 ret = null_ptid, "
2503 "TARGET_WAITKIND_NO_RESUMED\n");
2507 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2511 event_child
= get_thread_lwp (current_thread
);
2513 /* linux_wait_for_event only returns an exit status for the last
2514 child of a process. Report it. */
2515 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2519 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2520 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2524 debug_printf ("linux_wait_1 ret = %s, exited with "
2526 target_pid_to_str (ptid_of (current_thread
)),
2533 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2534 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2538 debug_printf ("linux_wait_1 ret = %s, terminated with "
2540 target_pid_to_str (ptid_of (current_thread
)),
2546 return ptid_of (current_thread
);
2549 /* If step-over executes a breakpoint instruction, it means a
2550 gdb/gdbserver breakpoint had been planted on top of a permanent
2551 breakpoint. The PC has been adjusted by
2552 check_stopped_by_breakpoint to point at the breakpoint address.
2553 Advance the PC manually past the breakpoint, otherwise the
2554 program would keep trapping the permanent breakpoint forever. */
2555 if (!ptid_equal (step_over_bkpt
, null_ptid
)
2556 && event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2558 unsigned int increment_pc
= the_low_target
.breakpoint_len
;
2562 debug_printf ("step-over for %s executed software breakpoint\n",
2563 target_pid_to_str (ptid_of (current_thread
)));
2566 if (increment_pc
!= 0)
2568 struct regcache
*regcache
2569 = get_thread_regcache (current_thread
, 1);
2571 event_child
->stop_pc
+= increment_pc
;
2572 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2574 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
2575 event_child
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
2579 /* If this event was not handled before, and is not a SIGTRAP, we
2580 report it. SIGILL and SIGSEGV are also treated as traps in case
2581 a breakpoint is inserted at the current PC. If this target does
2582 not support internal breakpoints at all, we also report the
2583 SIGTRAP without further processing; it's of no concern to us. */
2585 = (supports_breakpoints ()
2586 && (WSTOPSIG (w
) == SIGTRAP
2587 || ((WSTOPSIG (w
) == SIGILL
2588 || WSTOPSIG (w
) == SIGSEGV
)
2589 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2591 if (maybe_internal_trap
)
2593 /* Handle anything that requires bookkeeping before deciding to
2594 report the event or continue waiting. */
2596 /* First check if we can explain the SIGTRAP with an internal
2597 breakpoint, or if we should possibly report the event to GDB.
2598 Do this before anything that may remove or insert a
2600 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2602 /* We have a SIGTRAP, possibly a step-over dance has just
2603 finished. If so, tweak the state machine accordingly,
2604 reinsert breakpoints and delete any reinsert (software
2605 single-step) breakpoints. */
2606 step_over_finished
= finish_step_over (event_child
);
2608 /* Now invoke the callbacks of any internal breakpoints there. */
2609 check_breakpoints (event_child
->stop_pc
);
2611 /* Handle tracepoint data collecting. This may overflow the
2612 trace buffer, and cause a tracing stop, removing
2614 trace_event
= handle_tracepoints (event_child
);
2616 if (bp_explains_trap
)
2618 /* If we stepped or ran into an internal breakpoint, we've
2619 already handled it. So next time we resume (from this
2620 PC), we should step over it. */
2622 debug_printf ("Hit a gdbserver breakpoint.\n");
2624 if (breakpoint_here (event_child
->stop_pc
))
2625 event_child
->need_step_over
= 1;
2630 /* We have some other signal, possibly a step-over dance was in
2631 progress, and it should be cancelled too. */
2632 step_over_finished
= finish_step_over (event_child
);
2635 /* We have all the data we need. Either report the event to GDB, or
2636 resume threads and keep waiting for more. */
2638 /* If we're collecting a fast tracepoint, finish the collection and
2639 move out of the jump pad before delivering a signal. See
2640 linux_stabilize_threads. */
2643 && WSTOPSIG (w
) != SIGTRAP
2644 && supports_fast_tracepoints ()
2645 && agent_loaded_p ())
2648 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2649 "to defer or adjust it.\n",
2650 WSTOPSIG (w
), lwpid_of (current_thread
));
2652 /* Allow debugging the jump pad itself. */
2653 if (current_thread
->last_resume_kind
!= resume_step
2654 && maybe_move_out_of_jump_pad (event_child
, &w
))
2656 enqueue_one_deferred_signal (event_child
, &w
);
2659 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2660 WSTOPSIG (w
), lwpid_of (current_thread
));
2662 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2664 return ignore_event (ourstatus
);
2668 if (event_child
->collecting_fast_tracepoint
)
2671 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2672 "Check if we're already there.\n",
2673 lwpid_of (current_thread
),
2674 event_child
->collecting_fast_tracepoint
);
2678 event_child
->collecting_fast_tracepoint
2679 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2681 if (event_child
->collecting_fast_tracepoint
!= 1)
2683 /* No longer need this breakpoint. */
2684 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2687 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2688 "stopping all threads momentarily.\n");
2690 /* Other running threads could hit this breakpoint.
2691 We don't handle moribund locations like GDB does,
2692 instead we always pause all threads when removing
2693 breakpoints, so that any step-over or
2694 decr_pc_after_break adjustment is always taken
2695 care of while the breakpoint is still
2697 stop_all_lwps (1, event_child
);
2699 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2700 event_child
->exit_jump_pad_bkpt
= NULL
;
2702 unstop_all_lwps (1, event_child
);
2704 gdb_assert (event_child
->suspended
>= 0);
2708 if (event_child
->collecting_fast_tracepoint
== 0)
2711 debug_printf ("fast tracepoint finished "
2712 "collecting successfully.\n");
2714 /* We may have a deferred signal to report. */
2715 if (dequeue_one_deferred_signal (event_child
, &w
))
2718 debug_printf ("dequeued one signal.\n");
2723 debug_printf ("no deferred signals.\n");
2725 if (stabilizing_threads
)
2727 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2728 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2732 debug_printf ("linux_wait_1 ret = %s, stopped "
2733 "while stabilizing threads\n",
2734 target_pid_to_str (ptid_of (current_thread
)));
2738 return ptid_of (current_thread
);
2744 /* Check whether GDB would be interested in this event. */
2746 /* If GDB is not interested in this signal, don't stop other
2747 threads, and don't report it to GDB. Just resume the inferior
2748 right away. We do this for threading-related signals as well as
2749 any that GDB specifically requested we ignore. But never ignore
2750 SIGSTOP if we sent it ourselves, and do not ignore signals when
2751 stepping - they may require special handling to skip the signal
2752 handler. Also never ignore signals that could be caused by a
2754 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2757 && current_thread
->last_resume_kind
!= resume_step
2759 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2760 (current_process ()->priv
->thread_db
!= NULL
2761 && (WSTOPSIG (w
) == __SIGRTMIN
2762 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2765 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2766 && !(WSTOPSIG (w
) == SIGSTOP
2767 && current_thread
->last_resume_kind
== resume_stop
)
2768 && !linux_wstatus_maybe_breakpoint (w
))))
2770 siginfo_t info
, *info_p
;
2773 debug_printf ("Ignored signal %d for LWP %ld.\n",
2774 WSTOPSIG (w
), lwpid_of (current_thread
));
2776 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2777 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2781 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2782 WSTOPSIG (w
), info_p
);
2783 return ignore_event (ourstatus
);
2786 /* Note that all addresses are always "out of the step range" when
2787 there's no range to begin with. */
2788 in_step_range
= lwp_in_step_range (event_child
);
2790 /* If GDB wanted this thread to single step, and the thread is out
2791 of the step range, we always want to report the SIGTRAP, and let
2792 GDB handle it. Watchpoints should always be reported. So should
2793 signals we can't explain. A SIGTRAP we can't explain could be a
2794 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2795 do, we're be able to handle GDB breakpoints on top of internal
2796 breakpoints, by handling the internal breakpoint and still
2797 reporting the event to GDB. If we don't, we're out of luck, GDB
2798 won't see the breakpoint hit. */
2799 report_to_gdb
= (!maybe_internal_trap
2800 || (current_thread
->last_resume_kind
== resume_step
2802 || event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
2803 || (!step_over_finished
&& !in_step_range
2804 && !bp_explains_trap
&& !trace_event
)
2805 || (gdb_breakpoint_here (event_child
->stop_pc
)
2806 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2807 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2809 run_breakpoint_commands (event_child
->stop_pc
);
2811 /* We found no reason GDB would want us to stop. We either hit one
2812 of our own breakpoints, or finished an internal step GDB
2813 shouldn't know about. */
2818 if (bp_explains_trap
)
2819 debug_printf ("Hit a gdbserver breakpoint.\n");
2820 if (step_over_finished
)
2821 debug_printf ("Step-over finished.\n");
2823 debug_printf ("Tracepoint event.\n");
2824 if (lwp_in_step_range (event_child
))
2825 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2826 paddress (event_child
->stop_pc
),
2827 paddress (event_child
->step_range_start
),
2828 paddress (event_child
->step_range_end
));
2831 /* We're not reporting this breakpoint to GDB, so apply the
2832 decr_pc_after_break adjustment to the inferior's regcache
2835 if (the_low_target
.set_pc
!= NULL
)
2837 struct regcache
*regcache
2838 = get_thread_regcache (current_thread
, 1);
2839 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2842 /* We may have finished stepping over a breakpoint. If so,
2843 we've stopped and suspended all LWPs momentarily except the
2844 stepping one. This is where we resume them all again. We're
2845 going to keep waiting, so use proceed, which handles stepping
2846 over the next breakpoint. */
2848 debug_printf ("proceeding all threads.\n");
2850 if (step_over_finished
)
2851 unsuspend_all_lwps (event_child
);
2853 proceed_all_lwps ();
2854 return ignore_event (ourstatus
);
2859 if (current_thread
->last_resume_kind
== resume_step
)
2861 if (event_child
->step_range_start
== event_child
->step_range_end
)
2862 debug_printf ("GDB wanted to single-step, reporting event.\n");
2863 else if (!lwp_in_step_range (event_child
))
2864 debug_printf ("Out of step range, reporting event.\n");
2866 if (event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
)
2867 debug_printf ("Stopped by watchpoint.\n");
2868 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2869 debug_printf ("Stopped by GDB breakpoint.\n");
2871 debug_printf ("Hit a non-gdbserver trap event.\n");
2874 /* Alright, we're going to report a stop. */
2876 if (!stabilizing_threads
)
2878 /* In all-stop, stop all threads. */
2880 stop_all_lwps (0, NULL
);
2882 /* If we're not waiting for a specific LWP, choose an event LWP
2883 from among those that have had events. Giving equal priority
2884 to all LWPs that have had events helps prevent
2886 if (ptid_equal (ptid
, minus_one_ptid
))
2888 event_child
->status_pending_p
= 1;
2889 event_child
->status_pending
= w
;
2891 select_event_lwp (&event_child
);
2893 /* current_thread and event_child must stay in sync. */
2894 current_thread
= get_lwp_thread (event_child
);
2896 event_child
->status_pending_p
= 0;
2897 w
= event_child
->status_pending
;
2900 if (step_over_finished
)
2904 /* If we were doing a step-over, all other threads but
2905 the stepping one had been paused in start_step_over,
2906 with their suspend counts incremented. We don't want
2907 to do a full unstop/unpause, because we're in
2908 all-stop mode (so we want threads stopped), but we
2909 still need to unsuspend the other threads, to
2910 decrement their `suspended' count back. */
2911 unsuspend_all_lwps (event_child
);
2915 /* If we just finished a step-over, then all threads had
2916 been momentarily paused. In all-stop, that's fine,
2917 we want threads stopped by now anyway. In non-stop,
2918 we need to re-resume threads that GDB wanted to be
2920 unstop_all_lwps (1, event_child
);
2924 /* Stabilize threads (move out of jump pads). */
2926 stabilize_threads ();
2930 /* If we just finished a step-over, then all threads had been
2931 momentarily paused. In all-stop, that's fine, we want
2932 threads stopped by now anyway. In non-stop, we need to
2933 re-resume threads that GDB wanted to be running. */
2934 if (step_over_finished
)
2935 unstop_all_lwps (1, event_child
);
2938 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2940 /* Now that we've selected our final event LWP, un-adjust its PC if
2941 it was a software breakpoint. */
2942 if (event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2944 int decr_pc
= the_low_target
.decr_pc_after_break
;
2948 struct regcache
*regcache
2949 = get_thread_regcache (current_thread
, 1);
2950 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
2954 if (current_thread
->last_resume_kind
== resume_stop
2955 && WSTOPSIG (w
) == SIGSTOP
)
2957 /* A thread that has been requested to stop by GDB with vCont;t,
2958 and it stopped cleanly, so report as SIG0. The use of
2959 SIGSTOP is an implementation detail. */
2960 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2962 else if (current_thread
->last_resume_kind
== resume_stop
2963 && WSTOPSIG (w
) != SIGSTOP
)
2965 /* A thread that has been requested to stop by GDB with vCont;t,
2966 but, it stopped for other reasons. */
2967 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2971 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2974 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2978 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2979 target_pid_to_str (ptid_of (current_thread
)),
2980 ourstatus
->kind
, ourstatus
->value
.sig
);
2984 return ptid_of (current_thread
);
2987 /* Get rid of any pending event in the pipe. */
2989 async_file_flush (void)
2995 ret
= read (linux_event_pipe
[0], &buf
, 1);
2996 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2999 /* Put something in the pipe, so the event loop wakes up. */
3001 async_file_mark (void)
3005 async_file_flush ();
3008 ret
= write (linux_event_pipe
[1], "+", 1);
3009 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3011 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3012 be awakened anyway. */
3016 linux_wait (ptid_t ptid
,
3017 struct target_waitstatus
*ourstatus
, int target_options
)
3021 /* Flush the async file first. */
3022 if (target_is_async_p ())
3023 async_file_flush ();
3027 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3029 while ((target_options
& TARGET_WNOHANG
) == 0
3030 && ptid_equal (event_ptid
, null_ptid
)
3031 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3033 /* If at least one stop was reported, there may be more. A single
3034 SIGCHLD can signal more than one child stop. */
3035 if (target_is_async_p ()
3036 && (target_options
& TARGET_WNOHANG
) != 0
3037 && !ptid_equal (event_ptid
, null_ptid
))
3043 /* Send a signal to an LWP. */
3046 kill_lwp (unsigned long lwpid
, int signo
)
3048 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3049 fails, then we are not using nptl threads and we should be using kill. */
3053 static int tkill_failed
;
3060 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3061 if (errno
!= ENOSYS
)
3068 return kill (lwpid
, signo
);
3072 linux_stop_lwp (struct lwp_info
*lwp
)
3078 send_sigstop (struct lwp_info
*lwp
)
3082 pid
= lwpid_of (get_lwp_thread (lwp
));
3084 /* If we already have a pending stop signal for this process, don't
3086 if (lwp
->stop_expected
)
3089 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3095 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3097 lwp
->stop_expected
= 1;
3098 kill_lwp (pid
, SIGSTOP
);
3102 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3104 struct thread_info
*thread
= (struct thread_info
*) entry
;
3105 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3107 /* Ignore EXCEPT. */
3118 /* Increment the suspend count of an LWP, and stop it, if not stopped
3121 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3124 struct thread_info
*thread
= (struct thread_info
*) entry
;
3125 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3127 /* Ignore EXCEPT. */
3133 return send_sigstop_callback (entry
, except
);
3137 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3139 /* It's dead, really. */
3142 /* Store the exit status for later. */
3143 lwp
->status_pending_p
= 1;
3144 lwp
->status_pending
= wstat
;
3146 /* Prevent trying to stop it. */
3149 /* No further stops are expected from a dead lwp. */
3150 lwp
->stop_expected
= 0;
3153 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3156 wait_for_sigstop (void)
3158 struct thread_info
*saved_thread
;
3163 saved_thread
= current_thread
;
3164 if (saved_thread
!= NULL
)
3165 saved_tid
= saved_thread
->entry
.id
;
3167 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3170 debug_printf ("wait_for_sigstop: pulling events\n");
3172 /* Passing NULL_PTID as filter indicates we want all events to be
3173 left pending. Eventually this returns when there are no
3174 unwaited-for children left. */
3175 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3177 gdb_assert (ret
== -1);
3179 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3180 current_thread
= saved_thread
;
3184 debug_printf ("Previously current thread died.\n");
3188 /* We can't change the current inferior behind GDB's back,
3189 otherwise, a subsequent command may apply to the wrong
3191 current_thread
= NULL
;
3195 /* Set a valid thread as current. */
3196 set_desired_thread (0);
3201 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3202 move it out, because we need to report the stop event to GDB. For
3203 example, if the user puts a breakpoint in the jump pad, it's
3204 because she wants to debug it. */
3207 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3209 struct thread_info
*thread
= (struct thread_info
*) entry
;
3210 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3212 gdb_assert (lwp
->suspended
== 0);
3213 gdb_assert (lwp
->stopped
);
3215 /* Allow debugging the jump pad, gdb_collect, etc.. */
3216 return (supports_fast_tracepoints ()
3217 && agent_loaded_p ()
3218 && (gdb_breakpoint_here (lwp
->stop_pc
)
3219 || lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
3220 || thread
->last_resume_kind
== resume_step
)
3221 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3225 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3227 struct thread_info
*thread
= (struct thread_info
*) entry
;
3228 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3231 gdb_assert (lwp
->suspended
== 0);
3232 gdb_assert (lwp
->stopped
);
3234 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3236 /* Allow debugging the jump pad, gdb_collect, etc. */
3237 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3238 && lwp
->stop_reason
!= LWP_STOPPED_BY_WATCHPOINT
3239 && thread
->last_resume_kind
!= resume_step
3240 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3243 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3248 lwp
->status_pending_p
= 0;
3249 enqueue_one_deferred_signal (lwp
, wstat
);
3252 debug_printf ("Signal %d for LWP %ld deferred "
3254 WSTOPSIG (*wstat
), lwpid_of (thread
));
3257 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3264 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3266 struct thread_info
*thread
= (struct thread_info
*) entry
;
3267 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3276 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3277 If SUSPEND, then also increase the suspend count of every LWP,
3281 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3283 /* Should not be called recursively. */
3284 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3289 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3290 suspend
? "stop-and-suspend" : "stop",
3292 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3296 stopping_threads
= (suspend
3297 ? STOPPING_AND_SUSPENDING_THREADS
3298 : STOPPING_THREADS
);
3301 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3303 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3304 wait_for_sigstop ();
3305 stopping_threads
= NOT_STOPPING_THREADS
;
3309 debug_printf ("stop_all_lwps done, setting stopping_threads "
3310 "back to !stopping\n");
3315 /* Resume execution of the inferior process.
3316 If STEP is nonzero, single-step it.
3317 If SIGNAL is nonzero, give it that signal. */
3320 linux_resume_one_lwp (struct lwp_info
*lwp
,
3321 int step
, int signal
, siginfo_t
*info
)
3323 struct thread_info
*thread
= get_lwp_thread (lwp
);
3324 struct thread_info
*saved_thread
;
3325 int fast_tp_collecting
;
3327 if (lwp
->stopped
== 0)
3330 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3332 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3334 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3335 user used the "jump" command, or "set $pc = foo"). */
3336 if (lwp
->stop_pc
!= get_pc (lwp
))
3338 /* Collecting 'while-stepping' actions doesn't make sense
3340 release_while_stepping_state_list (thread
);
3343 /* If we have pending signals or status, and a new signal, enqueue the
3344 signal. Also enqueue the signal if we are waiting to reinsert a
3345 breakpoint; it will be picked up again below. */
3347 && (lwp
->status_pending_p
3348 || lwp
->pending_signals
!= NULL
3349 || lwp
->bp_reinsert
!= 0
3350 || fast_tp_collecting
))
3352 struct pending_signals
*p_sig
;
3353 p_sig
= xmalloc (sizeof (*p_sig
));
3354 p_sig
->prev
= lwp
->pending_signals
;
3355 p_sig
->signal
= signal
;
3357 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3359 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3360 lwp
->pending_signals
= p_sig
;
3363 if (lwp
->status_pending_p
)
3366 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3367 " has pending status\n",
3368 lwpid_of (thread
), step
? "step" : "continue", signal
,
3369 lwp
->stop_expected
? "expected" : "not expected");
3373 saved_thread
= current_thread
;
3374 current_thread
= thread
;
3377 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3378 lwpid_of (thread
), step
? "step" : "continue", signal
,
3379 lwp
->stop_expected
? "expected" : "not expected");
3381 /* This bit needs some thinking about. If we get a signal that
3382 we must report while a single-step reinsert is still pending,
3383 we often end up resuming the thread. It might be better to
3384 (ew) allow a stack of pending events; then we could be sure that
3385 the reinsert happened right away and not lose any signals.
3387 Making this stack would also shrink the window in which breakpoints are
3388 uninserted (see comment in linux_wait_for_lwp) but not enough for
3389 complete correctness, so it won't solve that problem. It may be
3390 worthwhile just to solve this one, however. */
3391 if (lwp
->bp_reinsert
!= 0)
3394 debug_printf (" pending reinsert at 0x%s\n",
3395 paddress (lwp
->bp_reinsert
));
3397 if (can_hardware_single_step ())
3399 if (fast_tp_collecting
== 0)
3402 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3404 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3411 /* Postpone any pending signal. It was enqueued above. */
3415 if (fast_tp_collecting
== 1)
3418 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3419 " (exit-jump-pad-bkpt)\n",
3422 /* Postpone any pending signal. It was enqueued above. */
3425 else if (fast_tp_collecting
== 2)
3428 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3429 " single-stepping\n",
3432 if (can_hardware_single_step ())
3436 internal_error (__FILE__
, __LINE__
,
3437 "moving out of jump pad single-stepping"
3438 " not implemented on this target");
3441 /* Postpone any pending signal. It was enqueued above. */
3445 /* If we have while-stepping actions in this thread set it stepping.
3446 If we have a signal to deliver, it may or may not be set to
3447 SIG_IGN, we don't know. Assume so, and allow collecting
3448 while-stepping into a signal handler. A possible smart thing to
3449 do would be to set an internal breakpoint at the signal return
3450 address, continue, and carry on catching this while-stepping
3451 action only when that breakpoint is hit. A future
3453 if (thread
->while_stepping
!= NULL
3454 && can_hardware_single_step ())
3457 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3462 if (the_low_target
.get_pc
!= NULL
)
3464 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3466 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3470 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3471 (long) lwp
->stop_pc
);
3475 /* If we have pending signals, consume one unless we are trying to
3476 reinsert a breakpoint or we're trying to finish a fast tracepoint
3478 if (lwp
->pending_signals
!= NULL
3479 && lwp
->bp_reinsert
== 0
3480 && fast_tp_collecting
== 0)
3482 struct pending_signals
**p_sig
;
3484 p_sig
= &lwp
->pending_signals
;
3485 while ((*p_sig
)->prev
!= NULL
)
3486 p_sig
= &(*p_sig
)->prev
;
3488 signal
= (*p_sig
)->signal
;
3489 if ((*p_sig
)->info
.si_signo
!= 0)
3490 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3497 if (the_low_target
.prepare_to_resume
!= NULL
)
3498 the_low_target
.prepare_to_resume (lwp
);
3500 regcache_invalidate_thread (thread
);
3503 lwp
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
3504 lwp
->stepping
= step
;
3505 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3506 (PTRACE_TYPE_ARG3
) 0,
3507 /* Coerce to a uintptr_t first to avoid potential gcc warning
3508 of coercing an 8 byte integer to a 4 byte pointer. */
3509 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3511 current_thread
= saved_thread
;
3514 /* ESRCH from ptrace either means that the thread was already
3515 running (an error) or that it is gone (a race condition). If
3516 it's gone, we will get a notification the next time we wait,
3517 so we can ignore the error. We could differentiate these
3518 two, but it's tricky without waiting; the thread still exists
3519 as a zombie, so sending it signal 0 would succeed. So just
3524 perror_with_name ("ptrace");
3528 struct thread_resume_array
3530 struct thread_resume
*resume
;
3534 /* This function is called once per thread via find_inferior.
3535 ARG is a pointer to a thread_resume_array struct.
3536 We look up the thread specified by ENTRY in ARG, and mark the thread
3537 with a pointer to the appropriate resume request.
3539 This algorithm is O(threads * resume elements), but resume elements
3540 is small (and will remain small at least until GDB supports thread
3544 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3546 struct thread_info
*thread
= (struct thread_info
*) entry
;
3547 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3549 struct thread_resume_array
*r
;
3553 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3555 ptid_t ptid
= r
->resume
[ndx
].thread
;
3556 if (ptid_equal (ptid
, minus_one_ptid
)
3557 || ptid_equal (ptid
, entry
->id
)
3558 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3560 || (ptid_get_pid (ptid
) == pid_of (thread
)
3561 && (ptid_is_pid (ptid
)
3562 || ptid_get_lwp (ptid
) == -1)))
3564 if (r
->resume
[ndx
].kind
== resume_stop
3565 && thread
->last_resume_kind
== resume_stop
)
3568 debug_printf ("already %s LWP %ld at GDB's request\n",
3569 (thread
->last_status
.kind
3570 == TARGET_WAITKIND_STOPPED
)
3578 lwp
->resume
= &r
->resume
[ndx
];
3579 thread
->last_resume_kind
= lwp
->resume
->kind
;
3581 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3582 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3584 /* If we had a deferred signal to report, dequeue one now.
3585 This can happen if LWP gets more than one signal while
3586 trying to get out of a jump pad. */
3588 && !lwp
->status_pending_p
3589 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3591 lwp
->status_pending_p
= 1;
3594 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3595 "leaving status pending.\n",
3596 WSTOPSIG (lwp
->status_pending
),
3604 /* No resume action for this thread. */
3610 /* find_inferior callback for linux_resume.
3611 Set *FLAG_P if this lwp has an interesting status pending. */
3614 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3616 struct thread_info
*thread
= (struct thread_info
*) entry
;
3617 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3619 /* LWPs which will not be resumed are not interesting, because
3620 we might not wait for them next time through linux_wait. */
3621 if (lwp
->resume
== NULL
)
3624 if (thread_still_has_status_pending_p (thread
))
3625 * (int *) flag_p
= 1;
3630 /* Return 1 if this lwp that GDB wants running is stopped at an
3631 internal breakpoint that we need to step over. It assumes that any
3632 required STOP_PC adjustment has already been propagated to the
3633 inferior's regcache. */
3636 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3638 struct thread_info
*thread
= (struct thread_info
*) entry
;
3639 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3640 struct thread_info
*saved_thread
;
3643 /* LWPs which will not be resumed are not interesting, because we
3644 might not wait for them next time through linux_wait. */
3649 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3654 if (thread
->last_resume_kind
== resume_stop
)
3657 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3663 gdb_assert (lwp
->suspended
>= 0);
3668 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3673 if (!lwp
->need_step_over
)
3676 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3679 if (lwp
->status_pending_p
)
3682 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3688 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3692 /* If the PC has changed since we stopped, then don't do anything,
3693 and let the breakpoint/tracepoint be hit. This happens if, for
3694 instance, GDB handled the decr_pc_after_break subtraction itself,
3695 GDB is OOL stepping this thread, or the user has issued a "jump"
3696 command, or poked thread's registers herself. */
3697 if (pc
!= lwp
->stop_pc
)
3700 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3701 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3703 paddress (lwp
->stop_pc
), paddress (pc
));
3705 lwp
->need_step_over
= 0;
3709 saved_thread
= current_thread
;
3710 current_thread
= thread
;
3712 /* We can only step over breakpoints we know about. */
3713 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3715 /* Don't step over a breakpoint that GDB expects to hit
3716 though. If the condition is being evaluated on the target's side
3717 and it evaluate to false, step over this breakpoint as well. */
3718 if (gdb_breakpoint_here (pc
)
3719 && gdb_condition_true_at_breakpoint (pc
)
3720 && gdb_no_commands_at_breakpoint (pc
))
3723 debug_printf ("Need step over [LWP %ld]? yes, but found"
3724 " GDB breakpoint at 0x%s; skipping step over\n",
3725 lwpid_of (thread
), paddress (pc
));
3727 current_thread
= saved_thread
;
3733 debug_printf ("Need step over [LWP %ld]? yes, "
3734 "found breakpoint at 0x%s\n",
3735 lwpid_of (thread
), paddress (pc
));
3737 /* We've found an lwp that needs stepping over --- return 1 so
3738 that find_inferior stops looking. */
3739 current_thread
= saved_thread
;
3741 /* If the step over is cancelled, this is set again. */
3742 lwp
->need_step_over
= 0;
3747 current_thread
= saved_thread
;
3750 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3752 lwpid_of (thread
), paddress (pc
));
3757 /* Start a step-over operation on LWP. When LWP stopped at a
3758 breakpoint, to make progress, we need to remove the breakpoint out
3759 of the way. If we let other threads run while we do that, they may
3760 pass by the breakpoint location and miss hitting it. To avoid
3761 that, a step-over momentarily stops all threads while LWP is
3762 single-stepped while the breakpoint is temporarily uninserted from
3763 the inferior. When the single-step finishes, we reinsert the
3764 breakpoint, and let all threads that are supposed to be running,
3767 On targets that don't support hardware single-step, we don't
3768 currently support full software single-stepping. Instead, we only
3769 support stepping over the thread event breakpoint, by asking the
3770 low target where to place a reinsert breakpoint. Since this
3771 routine assumes the breakpoint being stepped over is a thread event
3772 breakpoint, it usually assumes the return address of the current
3773 function is a good enough place to set the reinsert breakpoint. */
3776 start_step_over (struct lwp_info
*lwp
)
3778 struct thread_info
*thread
= get_lwp_thread (lwp
);
3779 struct thread_info
*saved_thread
;
3784 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3787 stop_all_lwps (1, lwp
);
3788 gdb_assert (lwp
->suspended
== 0);
3791 debug_printf ("Done stopping all threads for step-over.\n");
3793 /* Note, we should always reach here with an already adjusted PC,
3794 either by GDB (if we're resuming due to GDB's request), or by our
3795 caller, if we just finished handling an internal breakpoint GDB
3796 shouldn't care about. */
3799 saved_thread
= current_thread
;
3800 current_thread
= thread
;
3802 lwp
->bp_reinsert
= pc
;
3803 uninsert_breakpoints_at (pc
);
3804 uninsert_fast_tracepoint_jumps_at (pc
);
3806 if (can_hardware_single_step ())
3812 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3813 set_reinsert_breakpoint (raddr
);
3817 current_thread
= saved_thread
;
3819 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3821 /* Require next event from this LWP. */
3822 step_over_bkpt
= thread
->entry
.id
;
3826 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3827 start_step_over, if still there, and delete any reinsert
3828 breakpoints we've set, on non hardware single-step targets. */
3831 finish_step_over (struct lwp_info
*lwp
)
3833 if (lwp
->bp_reinsert
!= 0)
3836 debug_printf ("Finished step over.\n");
3838 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3839 may be no breakpoint to reinsert there by now. */
3840 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3841 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3843 lwp
->bp_reinsert
= 0;
3845 /* Delete any software-single-step reinsert breakpoints. No
3846 longer needed. We don't have to worry about other threads
3847 hitting this trap, and later not being able to explain it,
3848 because we were stepping over a breakpoint, and we hold all
3849 threads but LWP stopped while doing that. */
3850 if (!can_hardware_single_step ())
3851 delete_reinsert_breakpoints ();
3853 step_over_bkpt
= null_ptid
;
3860 /* This function is called once per thread. We check the thread's resume
3861 request, which will tell us whether to resume, step, or leave the thread
3862 stopped; and what signal, if any, it should be sent.
3864 For threads which we aren't explicitly told otherwise, we preserve
3865 the stepping flag; this is used for stepping over gdbserver-placed
3868 If pending_flags was set in any thread, we queue any needed
3869 signals, since we won't actually resume. We already have a pending
3870 event to report, so we don't need to preserve any step requests;
3871 they should be re-issued if necessary. */
3874 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3876 struct thread_info
*thread
= (struct thread_info
*) entry
;
3877 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3879 int leave_all_stopped
= * (int *) arg
;
3882 if (lwp
->resume
== NULL
)
3885 if (lwp
->resume
->kind
== resume_stop
)
3888 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3893 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3895 /* Stop the thread, and wait for the event asynchronously,
3896 through the event loop. */
3902 debug_printf ("already stopped LWP %ld\n",
3905 /* The LWP may have been stopped in an internal event that
3906 was not meant to be notified back to GDB (e.g., gdbserver
3907 breakpoint), so we should be reporting a stop event in
3910 /* If the thread already has a pending SIGSTOP, this is a
3911 no-op. Otherwise, something later will presumably resume
3912 the thread and this will cause it to cancel any pending
3913 operation, due to last_resume_kind == resume_stop. If
3914 the thread already has a pending status to report, we
3915 will still report it the next time we wait - see
3916 status_pending_p_callback. */
3918 /* If we already have a pending signal to report, then
3919 there's no need to queue a SIGSTOP, as this means we're
3920 midway through moving the LWP out of the jumppad, and we
3921 will report the pending signal as soon as that is
3923 if (lwp
->pending_signals_to_report
== NULL
)
3927 /* For stop requests, we're done. */
3929 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3933 /* If this thread which is about to be resumed has a pending status,
3934 then don't resume any threads - we can just report the pending
3935 status. Make sure to queue any signals that would otherwise be
3936 sent. In all-stop mode, we do this decision based on if *any*
3937 thread has a pending status. If there's a thread that needs the
3938 step-over-breakpoint dance, then don't resume any other thread
3939 but that particular one. */
3940 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3945 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3947 step
= (lwp
->resume
->kind
== resume_step
);
3948 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3953 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3955 /* If we have a new signal, enqueue the signal. */
3956 if (lwp
->resume
->sig
!= 0)
3958 struct pending_signals
*p_sig
;
3959 p_sig
= xmalloc (sizeof (*p_sig
));
3960 p_sig
->prev
= lwp
->pending_signals
;
3961 p_sig
->signal
= lwp
->resume
->sig
;
3962 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3964 /* If this is the same signal we were previously stopped by,
3965 make sure to queue its siginfo. We can ignore the return
3966 value of ptrace; if it fails, we'll skip
3967 PTRACE_SETSIGINFO. */
3968 if (WIFSTOPPED (lwp
->last_status
)
3969 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3970 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3973 lwp
->pending_signals
= p_sig
;
3977 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3983 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3985 struct thread_resume_array array
= { resume_info
, n
};
3986 struct thread_info
*need_step_over
= NULL
;
3988 int leave_all_stopped
;
3993 debug_printf ("linux_resume:\n");
3996 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3998 /* If there is a thread which would otherwise be resumed, which has
3999 a pending status, then don't resume any threads - we can just
4000 report the pending status. Make sure to queue any signals that
4001 would otherwise be sent. In non-stop mode, we'll apply this
4002 logic to each thread individually. We consume all pending events
4003 before considering to start a step-over (in all-stop). */
4006 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4008 /* If there is a thread which would otherwise be resumed, which is
4009 stopped at a breakpoint that needs stepping over, then don't
4010 resume any threads - have it step over the breakpoint with all
4011 other threads stopped, then resume all threads again. Make sure
4012 to queue any signals that would otherwise be delivered or
4014 if (!any_pending
&& supports_breakpoints ())
4016 = (struct thread_info
*) find_inferior (&all_threads
,
4017 need_step_over_p
, NULL
);
4019 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4023 if (need_step_over
!= NULL
)
4024 debug_printf ("Not resuming all, need step over\n");
4025 else if (any_pending
)
4026 debug_printf ("Not resuming, all-stop and found "
4027 "an LWP with pending status\n");
4029 debug_printf ("Resuming, no pending status or step over needed\n");
4032 /* Even if we're leaving threads stopped, queue all signals we'd
4033 otherwise deliver. */
4034 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4037 start_step_over (get_thread_lwp (need_step_over
));
4041 debug_printf ("linux_resume done\n");
4046 /* This function is called once per thread. We check the thread's
4047 last resume request, which will tell us whether to resume, step, or
4048 leave the thread stopped. Any signal the client requested to be
4049 delivered has already been enqueued at this point.
4051 If any thread that GDB wants running is stopped at an internal
4052 breakpoint that needs stepping over, we start a step-over operation
4053 on that particular thread, and leave all others stopped. */
4056 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4058 struct thread_info
*thread
= (struct thread_info
*) entry
;
4059 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4066 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4071 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4075 if (thread
->last_resume_kind
== resume_stop
4076 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4079 debug_printf (" client wants LWP to remain %ld stopped\n",
4084 if (lwp
->status_pending_p
)
4087 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4092 gdb_assert (lwp
->suspended
>= 0);
4097 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4101 if (thread
->last_resume_kind
== resume_stop
4102 && lwp
->pending_signals_to_report
== NULL
4103 && lwp
->collecting_fast_tracepoint
== 0)
4105 /* We haven't reported this LWP as stopped yet (otherwise, the
4106 last_status.kind check above would catch it, and we wouldn't
4107 reach here. This LWP may have been momentarily paused by a
4108 stop_all_lwps call while handling for example, another LWP's
4109 step-over. In that case, the pending expected SIGSTOP signal
4110 that was queued at vCont;t handling time will have already
4111 been consumed by wait_for_sigstop, and so we need to requeue
4112 another one here. Note that if the LWP already has a SIGSTOP
4113 pending, this is a no-op. */
4116 debug_printf ("Client wants LWP %ld to stop. "
4117 "Making sure it has a SIGSTOP pending\n",
4123 step
= thread
->last_resume_kind
== resume_step
;
4124 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4129 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4131 struct thread_info
*thread
= (struct thread_info
*) entry
;
4132 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4138 gdb_assert (lwp
->suspended
>= 0);
4140 return proceed_one_lwp (entry
, except
);
4143 /* When we finish a step-over, set threads running again. If there's
4144 another thread that may need a step-over, now's the time to start
4145 it. Eventually, we'll move all threads past their breakpoints. */
4148 proceed_all_lwps (void)
4150 struct thread_info
*need_step_over
;
4152 /* If there is a thread which would otherwise be resumed, which is
4153 stopped at a breakpoint that needs stepping over, then don't
4154 resume any threads - have it step over the breakpoint with all
4155 other threads stopped, then resume all threads again. */
4157 if (supports_breakpoints ())
4160 = (struct thread_info
*) find_inferior (&all_threads
,
4161 need_step_over_p
, NULL
);
4163 if (need_step_over
!= NULL
)
4166 debug_printf ("proceed_all_lwps: found "
4167 "thread %ld needing a step-over\n",
4168 lwpid_of (need_step_over
));
4170 start_step_over (get_thread_lwp (need_step_over
));
4176 debug_printf ("Proceeding, no step-over needed\n");
4178 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4181 /* Stopped LWPs that the client wanted to be running, that don't have
4182 pending statuses, are set to run again, except for EXCEPT, if not
4183 NULL. This undoes a stop_all_lwps call. */
4186 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4192 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4193 lwpid_of (get_lwp_thread (except
)));
4195 debug_printf ("unstopping all lwps\n");
4199 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4201 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4205 debug_printf ("unstop_all_lwps done\n");
4211 #ifdef HAVE_LINUX_REGSETS
4213 #define use_linux_regsets 1
4215 /* Returns true if REGSET has been disabled. */
4218 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4220 return (info
->disabled_regsets
!= NULL
4221 && info
->disabled_regsets
[regset
- info
->regsets
]);
4224 /* Disable REGSET. */
4227 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4231 dr_offset
= regset
- info
->regsets
;
4232 if (info
->disabled_regsets
== NULL
)
4233 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4234 info
->disabled_regsets
[dr_offset
] = 1;
4238 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4239 struct regcache
*regcache
)
4241 struct regset_info
*regset
;
4242 int saw_general_regs
= 0;
4246 pid
= lwpid_of (current_thread
);
4247 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4252 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4255 buf
= xmalloc (regset
->size
);
4257 nt_type
= regset
->nt_type
;
4261 iov
.iov_len
= regset
->size
;
4262 data
= (void *) &iov
;
4268 res
= ptrace (regset
->get_request
, pid
,
4269 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4271 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4277 /* If we get EIO on a regset, do not try it again for
4278 this process mode. */
4279 disable_regset (regsets_info
, regset
);
4281 else if (errno
== ENODATA
)
4283 /* ENODATA may be returned if the regset is currently
4284 not "active". This can happen in normal operation,
4285 so suppress the warning in this case. */
4290 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4297 if (regset
->type
== GENERAL_REGS
)
4298 saw_general_regs
= 1;
4299 regset
->store_function (regcache
, buf
);
4303 if (saw_general_regs
)
4310 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4311 struct regcache
*regcache
)
4313 struct regset_info
*regset
;
4314 int saw_general_regs
= 0;
4318 pid
= lwpid_of (current_thread
);
4319 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4324 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4325 || regset
->fill_function
== NULL
)
4328 buf
= xmalloc (regset
->size
);
4330 /* First fill the buffer with the current register set contents,
4331 in case there are any items in the kernel's regset that are
4332 not in gdbserver's regcache. */
4334 nt_type
= regset
->nt_type
;
4338 iov
.iov_len
= regset
->size
;
4339 data
= (void *) &iov
;
4345 res
= ptrace (regset
->get_request
, pid
,
4346 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4348 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4353 /* Then overlay our cached registers on that. */
4354 regset
->fill_function (regcache
, buf
);
4356 /* Only now do we write the register set. */
4358 res
= ptrace (regset
->set_request
, pid
,
4359 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4361 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4369 /* If we get EIO on a regset, do not try it again for
4370 this process mode. */
4371 disable_regset (regsets_info
, regset
);
4373 else if (errno
== ESRCH
)
4375 /* At this point, ESRCH should mean the process is
4376 already gone, in which case we simply ignore attempts
4377 to change its registers. See also the related
4378 comment in linux_resume_one_lwp. */
4384 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4387 else if (regset
->type
== GENERAL_REGS
)
4388 saw_general_regs
= 1;
4391 if (saw_general_regs
)
4397 #else /* !HAVE_LINUX_REGSETS */
4399 #define use_linux_regsets 0
4400 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4401 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4405 /* Return 1 if register REGNO is supported by one of the regset ptrace
4406 calls or 0 if it has to be transferred individually. */
4409 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4411 unsigned char mask
= 1 << (regno
% 8);
4412 size_t index
= regno
/ 8;
4414 return (use_linux_regsets
4415 && (regs_info
->regset_bitmap
== NULL
4416 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4419 #ifdef HAVE_LINUX_USRREGS
4422 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4426 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4427 error ("Invalid register number %d.", regnum
);
4429 addr
= usrregs
->regmap
[regnum
];
4434 /* Fetch one register. */
4436 fetch_register (const struct usrregs_info
*usrregs
,
4437 struct regcache
*regcache
, int regno
)
4444 if (regno
>= usrregs
->num_regs
)
4446 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4449 regaddr
= register_addr (usrregs
, regno
);
4453 size
= ((register_size (regcache
->tdesc
, regno
)
4454 + sizeof (PTRACE_XFER_TYPE
) - 1)
4455 & -sizeof (PTRACE_XFER_TYPE
));
4456 buf
= alloca (size
);
4458 pid
= lwpid_of (current_thread
);
4459 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4462 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4463 ptrace (PTRACE_PEEKUSER
, pid
,
4464 /* Coerce to a uintptr_t first to avoid potential gcc warning
4465 of coercing an 8 byte integer to a 4 byte pointer. */
4466 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4467 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4469 error ("reading register %d: %s", regno
, strerror (errno
));
4472 if (the_low_target
.supply_ptrace_register
)
4473 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4475 supply_register (regcache
, regno
, buf
);
4478 /* Store one register. */
4480 store_register (const struct usrregs_info
*usrregs
,
4481 struct regcache
*regcache
, int regno
)
4488 if (regno
>= usrregs
->num_regs
)
4490 if ((*the_low_target
.cannot_store_register
) (regno
))
4493 regaddr
= register_addr (usrregs
, regno
);
4497 size
= ((register_size (regcache
->tdesc
, regno
)
4498 + sizeof (PTRACE_XFER_TYPE
) - 1)
4499 & -sizeof (PTRACE_XFER_TYPE
));
4500 buf
= alloca (size
);
4501 memset (buf
, 0, size
);
4503 if (the_low_target
.collect_ptrace_register
)
4504 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4506 collect_register (regcache
, regno
, buf
);
4508 pid
= lwpid_of (current_thread
);
4509 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4512 ptrace (PTRACE_POKEUSER
, pid
,
4513 /* Coerce to a uintptr_t first to avoid potential gcc warning
4514 about coercing an 8 byte integer to a 4 byte pointer. */
4515 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4516 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4519 /* At this point, ESRCH should mean the process is
4520 already gone, in which case we simply ignore attempts
4521 to change its registers. See also the related
4522 comment in linux_resume_one_lwp. */
4526 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4527 error ("writing register %d: %s", regno
, strerror (errno
));
4529 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4533 /* Fetch all registers, or just one, from the child process.
4534 If REGNO is -1, do this for all registers, skipping any that are
4535 assumed to have been retrieved by regsets_fetch_inferior_registers,
4536 unless ALL is non-zero.
4537 Otherwise, REGNO specifies which register (so we can save time). */
4539 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4540 struct regcache
*regcache
, int regno
, int all
)
4542 struct usrregs_info
*usr
= regs_info
->usrregs
;
4546 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4547 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4548 fetch_register (usr
, regcache
, regno
);
4551 fetch_register (usr
, regcache
, regno
);
4554 /* Store our register values back into the inferior.
4555 If REGNO is -1, do this for all registers, skipping any that are
4556 assumed to have been saved by regsets_store_inferior_registers,
4557 unless ALL is non-zero.
4558 Otherwise, REGNO specifies which register (so we can save time). */
4560 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4561 struct regcache
*regcache
, int regno
, int all
)
4563 struct usrregs_info
*usr
= regs_info
->usrregs
;
4567 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4568 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4569 store_register (usr
, regcache
, regno
);
4572 store_register (usr
, regcache
, regno
);
4575 #else /* !HAVE_LINUX_USRREGS */
4577 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4578 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4584 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4588 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4592 if (the_low_target
.fetch_register
!= NULL
4593 && regs_info
->usrregs
!= NULL
)
4594 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4595 (*the_low_target
.fetch_register
) (regcache
, regno
);
4597 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4598 if (regs_info
->usrregs
!= NULL
)
4599 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4603 if (the_low_target
.fetch_register
!= NULL
4604 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4607 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4609 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4611 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4612 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4617 linux_store_registers (struct regcache
*regcache
, int regno
)
4621 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4625 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4627 if (regs_info
->usrregs
!= NULL
)
4628 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4632 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4634 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4636 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4637 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4642 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4643 to debugger memory starting at MYADDR. */
4646 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4648 int pid
= lwpid_of (current_thread
);
4649 register PTRACE_XFER_TYPE
*buffer
;
4650 register CORE_ADDR addr
;
4657 /* Try using /proc. Don't bother for one word. */
4658 if (len
>= 3 * sizeof (long))
4662 /* We could keep this file open and cache it - possibly one per
4663 thread. That requires some juggling, but is even faster. */
4664 sprintf (filename
, "/proc/%d/mem", pid
);
4665 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4669 /* If pread64 is available, use it. It's faster if the kernel
4670 supports it (only one syscall), and it's 64-bit safe even on
4671 32-bit platforms (for instance, SPARC debugging a SPARC64
4674 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4677 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4678 bytes
= read (fd
, myaddr
, len
);
4685 /* Some data was read, we'll try to get the rest with ptrace. */
4695 /* Round starting address down to longword boundary. */
4696 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4697 /* Round ending address up; get number of longwords that makes. */
4698 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4699 / sizeof (PTRACE_XFER_TYPE
));
4700 /* Allocate buffer of that many longwords. */
4701 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4703 /* Read all the longwords */
4705 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4707 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4708 about coercing an 8 byte integer to a 4 byte pointer. */
4709 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4710 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4711 (PTRACE_TYPE_ARG4
) 0);
4717 /* Copy appropriate bytes out of the buffer. */
4720 i
*= sizeof (PTRACE_XFER_TYPE
);
4721 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4723 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4730 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4731 memory at MEMADDR. On failure (cannot write to the inferior)
4732 returns the value of errno. Always succeeds if LEN is zero. */
4735 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4738 /* Round starting address down to longword boundary. */
4739 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4740 /* Round ending address up; get number of longwords that makes. */
4742 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4743 / sizeof (PTRACE_XFER_TYPE
);
4745 /* Allocate buffer of that many longwords. */
4746 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4747 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4749 int pid
= lwpid_of (current_thread
);
4753 /* Zero length write always succeeds. */
4759 /* Dump up to four bytes. */
4760 unsigned int val
= * (unsigned int *) myaddr
;
4766 val
= val
& 0xffffff;
4767 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4768 val
, (long)memaddr
);
4771 /* Fill start and end extra bytes of buffer with existing memory data. */
4774 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4775 about coercing an 8 byte integer to a 4 byte pointer. */
4776 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4777 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4778 (PTRACE_TYPE_ARG4
) 0);
4786 = ptrace (PTRACE_PEEKTEXT
, pid
,
4787 /* Coerce to a uintptr_t first to avoid potential gcc warning
4788 about coercing an 8 byte integer to a 4 byte pointer. */
4789 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4790 * sizeof (PTRACE_XFER_TYPE
)),
4791 (PTRACE_TYPE_ARG4
) 0);
4796 /* Copy data to be written over corresponding part of buffer. */
4798 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4801 /* Write the entire buffer. */
4803 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4806 ptrace (PTRACE_POKETEXT
, pid
,
4807 /* Coerce to a uintptr_t first to avoid potential gcc warning
4808 about coercing an 8 byte integer to a 4 byte pointer. */
4809 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4810 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4819 linux_look_up_symbols (void)
4821 #ifdef USE_THREAD_DB
4822 struct process_info
*proc
= current_process ();
4824 if (proc
->priv
->thread_db
!= NULL
)
4827 /* If the kernel supports tracing clones, then we don't need to
4828 use the magic thread event breakpoint to learn about
4830 thread_db_init (!linux_supports_traceclone ());
4835 linux_request_interrupt (void)
4837 extern unsigned long signal_pid
;
4839 /* Send a SIGINT to the process group. This acts just like the user
4840 typed a ^C on the controlling terminal. */
4841 kill (-signal_pid
, SIGINT
);
4844 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4845 to debugger memory starting at MYADDR. */
4848 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4850 char filename
[PATH_MAX
];
4852 int pid
= lwpid_of (current_thread
);
4854 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4856 fd
= open (filename
, O_RDONLY
);
4860 if (offset
!= (CORE_ADDR
) 0
4861 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4864 n
= read (fd
, myaddr
, len
);
4871 /* These breakpoint and watchpoint related wrapper functions simply
4872 pass on the function call if the target has registered a
4873 corresponding function. */
4876 linux_supports_z_point_type (char z_type
)
4878 return (the_low_target
.supports_z_point_type
!= NULL
4879 && the_low_target
.supports_z_point_type (z_type
));
4883 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4884 int size
, struct raw_breakpoint
*bp
)
4886 if (the_low_target
.insert_point
!= NULL
)
4887 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4889 /* Unsupported (see target.h). */
4894 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4895 int size
, struct raw_breakpoint
*bp
)
4897 if (the_low_target
.remove_point
!= NULL
)
4898 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4900 /* Unsupported (see target.h). */
4905 linux_stopped_by_watchpoint (void)
4907 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4909 return lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
4913 linux_stopped_data_address (void)
4915 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4917 return lwp
->stopped_data_address
;
4920 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4921 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4922 && defined(PT_TEXT_END_ADDR)
4924 /* This is only used for targets that define PT_TEXT_ADDR,
4925 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4926 the target has different ways of acquiring this information, like
4929 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4930 to tell gdb about. */
4933 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4935 unsigned long text
, text_end
, data
;
4936 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4940 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4941 (PTRACE_TYPE_ARG4
) 0);
4942 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4943 (PTRACE_TYPE_ARG4
) 0);
4944 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4945 (PTRACE_TYPE_ARG4
) 0);
4949 /* Both text and data offsets produced at compile-time (and so
4950 used by gdb) are relative to the beginning of the program,
4951 with the data segment immediately following the text segment.
4952 However, the actual runtime layout in memory may put the data
4953 somewhere else, so when we send gdb a data base-address, we
4954 use the real data base address and subtract the compile-time
4955 data base-address from it (which is just the length of the
4956 text segment). BSS immediately follows data in both
4959 *data_p
= data
- (text_end
- text
);
4968 linux_qxfer_osdata (const char *annex
,
4969 unsigned char *readbuf
, unsigned const char *writebuf
,
4970 CORE_ADDR offset
, int len
)
4972 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4975 /* Convert a native/host siginfo object, into/from the siginfo in the
4976 layout of the inferiors' architecture. */
4979 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4983 if (the_low_target
.siginfo_fixup
!= NULL
)
4984 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4986 /* If there was no callback, or the callback didn't do anything,
4987 then just do a straight memcpy. */
4991 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4993 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4998 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4999 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5003 char inf_siginfo
[sizeof (siginfo_t
)];
5005 if (current_thread
== NULL
)
5008 pid
= lwpid_of (current_thread
);
5011 debug_printf ("%s siginfo for lwp %d.\n",
5012 readbuf
!= NULL
? "Reading" : "Writing",
5015 if (offset
>= sizeof (siginfo
))
5018 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5021 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5022 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5023 inferior with a 64-bit GDBSERVER should look the same as debugging it
5024 with a 32-bit GDBSERVER, we need to convert it. */
5025 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5027 if (offset
+ len
> sizeof (siginfo
))
5028 len
= sizeof (siginfo
) - offset
;
5030 if (readbuf
!= NULL
)
5031 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5034 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5036 /* Convert back to ptrace layout before flushing it out. */
5037 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5039 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5046 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5047 so we notice when children change state; as the handler for the
5048 sigsuspend in my_waitpid. */
5051 sigchld_handler (int signo
)
5053 int old_errno
= errno
;
5059 /* fprintf is not async-signal-safe, so call write
5061 if (write (2, "sigchld_handler\n",
5062 sizeof ("sigchld_handler\n") - 1) < 0)
5063 break; /* just ignore */
5067 if (target_is_async_p ())
5068 async_file_mark (); /* trigger a linux_wait */
5074 linux_supports_non_stop (void)
5080 linux_async (int enable
)
5082 int previous
= target_is_async_p ();
5085 debug_printf ("linux_async (%d), previous=%d\n",
5088 if (previous
!= enable
)
5091 sigemptyset (&mask
);
5092 sigaddset (&mask
, SIGCHLD
);
5094 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5098 if (pipe (linux_event_pipe
) == -1)
5100 linux_event_pipe
[0] = -1;
5101 linux_event_pipe
[1] = -1;
5102 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5104 warning ("creating event pipe failed.");
5108 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5109 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5111 /* Register the event loop handler. */
5112 add_file_handler (linux_event_pipe
[0],
5113 handle_target_event
, NULL
);
5115 /* Always trigger a linux_wait. */
5120 delete_file_handler (linux_event_pipe
[0]);
5122 close (linux_event_pipe
[0]);
5123 close (linux_event_pipe
[1]);
5124 linux_event_pipe
[0] = -1;
5125 linux_event_pipe
[1] = -1;
5128 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5135 linux_start_non_stop (int nonstop
)
5137 /* Register or unregister from event-loop accordingly. */
5138 linux_async (nonstop
);
5140 if (target_is_async_p () != (nonstop
!= 0))
5147 linux_supports_multi_process (void)
5153 linux_supports_disable_randomization (void)
5155 #ifdef HAVE_PERSONALITY
5163 linux_supports_agent (void)
5169 linux_supports_range_stepping (void)
5171 if (*the_low_target
.supports_range_stepping
== NULL
)
5174 return (*the_low_target
.supports_range_stepping
) ();
5177 /* Enumerate spufs IDs for process PID. */
5179 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5185 struct dirent
*entry
;
5187 sprintf (path
, "/proc/%ld/fd", pid
);
5188 dir
= opendir (path
);
5193 while ((entry
= readdir (dir
)) != NULL
)
5199 fd
= atoi (entry
->d_name
);
5203 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5204 if (stat (path
, &st
) != 0)
5206 if (!S_ISDIR (st
.st_mode
))
5209 if (statfs (path
, &stfs
) != 0)
5211 if (stfs
.f_type
!= SPUFS_MAGIC
)
5214 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5216 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5226 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5227 object type, using the /proc file system. */
5229 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5230 unsigned const char *writebuf
,
5231 CORE_ADDR offset
, int len
)
5233 long pid
= lwpid_of (current_thread
);
5238 if (!writebuf
&& !readbuf
)
5246 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5249 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5250 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5255 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5262 ret
= write (fd
, writebuf
, (size_t) len
);
5264 ret
= read (fd
, readbuf
, (size_t) len
);
5270 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5271 struct target_loadseg
5273 /* Core address to which the segment is mapped. */
5275 /* VMA recorded in the program header. */
5277 /* Size of this segment in memory. */
5281 # if defined PT_GETDSBT
5282 struct target_loadmap
5284 /* Protocol version number, must be zero. */
5286 /* Pointer to the DSBT table, its size, and the DSBT index. */
5287 unsigned *dsbt_table
;
5288 unsigned dsbt_size
, dsbt_index
;
5289 /* Number of segments in this map. */
5291 /* The actual memory map. */
5292 struct target_loadseg segs
[/*nsegs*/];
5294 # define LINUX_LOADMAP PT_GETDSBT
5295 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5296 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5298 struct target_loadmap
5300 /* Protocol version number, must be zero. */
5302 /* Number of segments in this map. */
5304 /* The actual memory map. */
5305 struct target_loadseg segs
[/*nsegs*/];
5307 # define LINUX_LOADMAP PTRACE_GETFDPIC
5308 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5309 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5313 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5314 unsigned char *myaddr
, unsigned int len
)
5316 int pid
= lwpid_of (current_thread
);
5318 struct target_loadmap
*data
= NULL
;
5319 unsigned int actual_length
, copy_length
;
5321 if (strcmp (annex
, "exec") == 0)
5322 addr
= (int) LINUX_LOADMAP_EXEC
;
5323 else if (strcmp (annex
, "interp") == 0)
5324 addr
= (int) LINUX_LOADMAP_INTERP
;
5328 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5334 actual_length
= sizeof (struct target_loadmap
)
5335 + sizeof (struct target_loadseg
) * data
->nsegs
;
5337 if (offset
< 0 || offset
> actual_length
)
5340 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5341 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5345 # define linux_read_loadmap NULL
5346 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5349 linux_process_qsupported (const char *query
)
5351 if (the_low_target
.process_qsupported
!= NULL
)
5352 the_low_target
.process_qsupported (query
);
5356 linux_supports_tracepoints (void)
5358 if (*the_low_target
.supports_tracepoints
== NULL
)
5361 return (*the_low_target
.supports_tracepoints
) ();
5365 linux_read_pc (struct regcache
*regcache
)
5367 if (the_low_target
.get_pc
== NULL
)
5370 return (*the_low_target
.get_pc
) (regcache
);
5374 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5376 gdb_assert (the_low_target
.set_pc
!= NULL
);
5378 (*the_low_target
.set_pc
) (regcache
, pc
);
5382 linux_thread_stopped (struct thread_info
*thread
)
5384 return get_thread_lwp (thread
)->stopped
;
5387 /* This exposes stop-all-threads functionality to other modules. */
5390 linux_pause_all (int freeze
)
5392 stop_all_lwps (freeze
, NULL
);
5395 /* This exposes unstop-all-threads functionality to other gdbserver
5399 linux_unpause_all (int unfreeze
)
5401 unstop_all_lwps (unfreeze
, NULL
);
5405 linux_prepare_to_access_memory (void)
5407 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5410 linux_pause_all (1);
5415 linux_done_accessing_memory (void)
5417 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5420 linux_unpause_all (1);
5424 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5425 CORE_ADDR collector
,
5428 CORE_ADDR
*jump_entry
,
5429 CORE_ADDR
*trampoline
,
5430 ULONGEST
*trampoline_size
,
5431 unsigned char *jjump_pad_insn
,
5432 ULONGEST
*jjump_pad_insn_size
,
5433 CORE_ADDR
*adjusted_insn_addr
,
5434 CORE_ADDR
*adjusted_insn_addr_end
,
5437 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5438 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5439 jump_entry
, trampoline
, trampoline_size
,
5440 jjump_pad_insn
, jjump_pad_insn_size
,
5441 adjusted_insn_addr
, adjusted_insn_addr_end
,
5445 static struct emit_ops
*
5446 linux_emit_ops (void)
5448 if (the_low_target
.emit_ops
!= NULL
)
5449 return (*the_low_target
.emit_ops
) ();
5455 linux_get_min_fast_tracepoint_insn_len (void)
5457 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5460 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5463 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5464 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5466 char filename
[PATH_MAX
];
5468 const int auxv_size
= is_elf64
5469 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5470 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5472 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5474 fd
= open (filename
, O_RDONLY
);
5480 while (read (fd
, buf
, auxv_size
) == auxv_size
5481 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5485 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5487 switch (aux
->a_type
)
5490 *phdr_memaddr
= aux
->a_un
.a_val
;
5493 *num_phdr
= aux
->a_un
.a_val
;
5499 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5501 switch (aux
->a_type
)
5504 *phdr_memaddr
= aux
->a_un
.a_val
;
5507 *num_phdr
= aux
->a_un
.a_val
;
5515 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5517 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5518 "phdr_memaddr = %ld, phdr_num = %d",
5519 (long) *phdr_memaddr
, *num_phdr
);
5526 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5529 get_dynamic (const int pid
, const int is_elf64
)
5531 CORE_ADDR phdr_memaddr
, relocation
;
5533 unsigned char *phdr_buf
;
5534 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5536 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5539 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5540 phdr_buf
= alloca (num_phdr
* phdr_size
);
5542 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5545 /* Compute relocation: it is expected to be 0 for "regular" executables,
5546 non-zero for PIE ones. */
5548 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5551 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5553 if (p
->p_type
== PT_PHDR
)
5554 relocation
= phdr_memaddr
- p
->p_vaddr
;
5558 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5560 if (p
->p_type
== PT_PHDR
)
5561 relocation
= phdr_memaddr
- p
->p_vaddr
;
5564 if (relocation
== -1)
5566 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5567 any real world executables, including PIE executables, have always
5568 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5569 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5570 or present DT_DEBUG anyway (fpc binaries are statically linked).
5572 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5574 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5579 for (i
= 0; i
< num_phdr
; i
++)
5583 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5585 if (p
->p_type
== PT_DYNAMIC
)
5586 return p
->p_vaddr
+ relocation
;
5590 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5592 if (p
->p_type
== PT_DYNAMIC
)
5593 return p
->p_vaddr
+ relocation
;
5600 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5601 can be 0 if the inferior does not yet have the library list initialized.
5602 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5603 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5606 get_r_debug (const int pid
, const int is_elf64
)
5608 CORE_ADDR dynamic_memaddr
;
5609 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5610 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5613 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5614 if (dynamic_memaddr
== 0)
5617 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5621 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5622 #ifdef DT_MIPS_RLD_MAP
5626 unsigned char buf
[sizeof (Elf64_Xword
)];
5630 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5632 if (linux_read_memory (dyn
->d_un
.d_val
,
5633 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5638 #endif /* DT_MIPS_RLD_MAP */
5640 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5641 map
= dyn
->d_un
.d_val
;
5643 if (dyn
->d_tag
== DT_NULL
)
5648 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5649 #ifdef DT_MIPS_RLD_MAP
5653 unsigned char buf
[sizeof (Elf32_Word
)];
5657 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5659 if (linux_read_memory (dyn
->d_un
.d_val
,
5660 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5665 #endif /* DT_MIPS_RLD_MAP */
5667 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5668 map
= dyn
->d_un
.d_val
;
5670 if (dyn
->d_tag
== DT_NULL
)
5674 dynamic_memaddr
+= dyn_size
;
5680 /* Read one pointer from MEMADDR in the inferior. */
5683 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5687 /* Go through a union so this works on either big or little endian
5688 hosts, when the inferior's pointer size is smaller than the size
5689 of CORE_ADDR. It is assumed the inferior's endianness is the
5690 same of the superior's. */
5693 CORE_ADDR core_addr
;
5698 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5701 if (ptr_size
== sizeof (CORE_ADDR
))
5702 *ptr
= addr
.core_addr
;
5703 else if (ptr_size
== sizeof (unsigned int))
5706 gdb_assert_not_reached ("unhandled pointer size");
5711 struct link_map_offsets
5713 /* Offset and size of r_debug.r_version. */
5714 int r_version_offset
;
5716 /* Offset and size of r_debug.r_map. */
5719 /* Offset to l_addr field in struct link_map. */
5722 /* Offset to l_name field in struct link_map. */
5725 /* Offset to l_ld field in struct link_map. */
5728 /* Offset to l_next field in struct link_map. */
5731 /* Offset to l_prev field in struct link_map. */
5735 /* Construct qXfer:libraries-svr4:read reply. */
5738 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5739 unsigned const char *writebuf
,
5740 CORE_ADDR offset
, int len
)
5743 unsigned document_len
;
5744 struct process_info_private
*const priv
= current_process ()->priv
;
5745 char filename
[PATH_MAX
];
5748 static const struct link_map_offsets lmo_32bit_offsets
=
5750 0, /* r_version offset. */
5751 4, /* r_debug.r_map offset. */
5752 0, /* l_addr offset in link_map. */
5753 4, /* l_name offset in link_map. */
5754 8, /* l_ld offset in link_map. */
5755 12, /* l_next offset in link_map. */
5756 16 /* l_prev offset in link_map. */
5759 static const struct link_map_offsets lmo_64bit_offsets
=
5761 0, /* r_version offset. */
5762 8, /* r_debug.r_map offset. */
5763 0, /* l_addr offset in link_map. */
5764 8, /* l_name offset in link_map. */
5765 16, /* l_ld offset in link_map. */
5766 24, /* l_next offset in link_map. */
5767 32 /* l_prev offset in link_map. */
5769 const struct link_map_offsets
*lmo
;
5770 unsigned int machine
;
5772 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5773 int allocated
= 1024;
5775 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5776 int header_done
= 0;
5778 if (writebuf
!= NULL
)
5780 if (readbuf
== NULL
)
5783 pid
= lwpid_of (current_thread
);
5784 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5785 is_elf64
= elf_64_file_p (filename
, &machine
);
5786 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5787 ptr_size
= is_elf64
? 8 : 4;
5789 while (annex
[0] != '\0')
5795 sep
= strchr (annex
, '=');
5800 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5802 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5806 annex
= strchr (sep
, ';');
5813 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5820 if (priv
->r_debug
== 0)
5821 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5823 /* We failed to find DT_DEBUG. Such situation will not change
5824 for this inferior - do not retry it. Report it to GDB as
5825 E01, see for the reasons at the GDB solib-svr4.c side. */
5826 if (priv
->r_debug
== (CORE_ADDR
) -1)
5829 if (priv
->r_debug
!= 0)
5831 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5832 (unsigned char *) &r_version
,
5833 sizeof (r_version
)) != 0
5836 warning ("unexpected r_debug version %d", r_version
);
5838 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5839 &lm_addr
, ptr_size
) != 0)
5841 warning ("unable to read r_map from 0x%lx",
5842 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5847 document
= xmalloc (allocated
);
5848 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5849 p
= document
+ strlen (document
);
5852 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5853 &l_name
, ptr_size
) == 0
5854 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5855 &l_addr
, ptr_size
) == 0
5856 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5857 &l_ld
, ptr_size
) == 0
5858 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5859 &l_prev
, ptr_size
) == 0
5860 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5861 &l_next
, ptr_size
) == 0)
5863 unsigned char libname
[PATH_MAX
];
5865 if (lm_prev
!= l_prev
)
5867 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5868 (long) lm_prev
, (long) l_prev
);
5872 /* Ignore the first entry even if it has valid name as the first entry
5873 corresponds to the main executable. The first entry should not be
5874 skipped if the dynamic loader was loaded late by a static executable
5875 (see solib-svr4.c parameter ignore_first). But in such case the main
5876 executable does not have PT_DYNAMIC present and this function already
5877 exited above due to failed get_r_debug. */
5880 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5885 /* Not checking for error because reading may stop before
5886 we've got PATH_MAX worth of characters. */
5888 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5889 libname
[sizeof (libname
) - 1] = '\0';
5890 if (libname
[0] != '\0')
5892 /* 6x the size for xml_escape_text below. */
5893 size_t len
= 6 * strlen ((char *) libname
);
5898 /* Terminate `<library-list-svr4'. */
5903 while (allocated
< p
- document
+ len
+ 200)
5905 /* Expand to guarantee sufficient storage. */
5906 uintptr_t document_len
= p
- document
;
5908 document
= xrealloc (document
, 2 * allocated
);
5910 p
= document
+ document_len
;
5913 name
= xml_escape_text ((char *) libname
);
5914 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5915 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5916 name
, (unsigned long) lm_addr
,
5917 (unsigned long) l_addr
, (unsigned long) l_ld
);
5928 /* Empty list; terminate `<library-list-svr4'. */
5932 strcpy (p
, "</library-list-svr4>");
5934 document_len
= strlen (document
);
5935 if (offset
< document_len
)
5936 document_len
-= offset
;
5939 if (len
> document_len
)
5942 memcpy (readbuf
, document
+ offset
, len
);
5948 #ifdef HAVE_LINUX_BTRACE
5950 /* See to_enable_btrace target method. */
5952 static struct btrace_target_info
*
5953 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
5955 struct btrace_target_info
*tinfo
;
5957 tinfo
= linux_enable_btrace (ptid
, conf
);
5959 if (tinfo
!= NULL
&& tinfo
->ptr_bits
== 0)
5961 struct thread_info
*thread
= find_thread_ptid (ptid
);
5962 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5964 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5970 /* See to_disable_btrace target method. */
5973 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5975 enum btrace_error err
;
5977 err
= linux_disable_btrace (tinfo
);
5978 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5981 /* See to_read_btrace target method. */
5984 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5987 struct btrace_data btrace
;
5988 struct btrace_block
*block
;
5989 enum btrace_error err
;
5992 btrace_data_init (&btrace
);
5994 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5995 if (err
!= BTRACE_ERR_NONE
)
5997 if (err
== BTRACE_ERR_OVERFLOW
)
5998 buffer_grow_str0 (buffer
, "E.Overflow.");
6000 buffer_grow_str0 (buffer
, "E.Generic Error.");
6002 btrace_data_fini (&btrace
);
6006 switch (btrace
.format
)
6008 case BTRACE_FORMAT_NONE
:
6009 buffer_grow_str0 (buffer
, "E.No Trace.");
6012 case BTRACE_FORMAT_BTS
:
6013 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6014 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6017 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6019 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6020 paddress (block
->begin
), paddress (block
->end
));
6022 buffer_grow_str0 (buffer
, "</btrace>\n");
6026 buffer_grow_str0 (buffer
, "E.Unknown Trace Format.");
6028 btrace_data_fini (&btrace
);
6032 btrace_data_fini (&btrace
);
6036 /* See to_btrace_conf target method. */
6039 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6040 struct buffer
*buffer
)
6042 const struct btrace_config
*conf
;
6044 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6045 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6047 conf
= linux_btrace_conf (tinfo
);
6050 switch (conf
->format
)
6052 case BTRACE_FORMAT_NONE
:
6055 case BTRACE_FORMAT_BTS
:
6056 buffer_xml_printf (buffer
, "<bts");
6057 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6058 buffer_xml_printf (buffer
, " />\n");
6063 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6066 #endif /* HAVE_LINUX_BTRACE */
6068 static struct target_ops linux_target_ops
= {
6069 linux_create_inferior
,
6078 linux_fetch_registers
,
6079 linux_store_registers
,
6080 linux_prepare_to_access_memory
,
6081 linux_done_accessing_memory
,
6084 linux_look_up_symbols
,
6085 linux_request_interrupt
,
6087 linux_supports_z_point_type
,
6090 linux_stopped_by_watchpoint
,
6091 linux_stopped_data_address
,
6092 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6093 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6094 && defined(PT_TEXT_END_ADDR)
6099 #ifdef USE_THREAD_DB
6100 thread_db_get_tls_address
,
6105 hostio_last_error_from_errno
,
6108 linux_supports_non_stop
,
6110 linux_start_non_stop
,
6111 linux_supports_multi_process
,
6112 #ifdef USE_THREAD_DB
6113 thread_db_handle_monitor_command
,
6117 linux_common_core_of_thread
,
6119 linux_process_qsupported
,
6120 linux_supports_tracepoints
,
6123 linux_thread_stopped
,
6127 linux_stabilize_threads
,
6128 linux_install_fast_tracepoint_jump_pad
,
6130 linux_supports_disable_randomization
,
6131 linux_get_min_fast_tracepoint_insn_len
,
6132 linux_qxfer_libraries_svr4
,
6133 linux_supports_agent
,
6134 #ifdef HAVE_LINUX_BTRACE
6135 linux_supports_btrace
,
6136 linux_low_enable_btrace
,
6137 linux_low_disable_btrace
,
6138 linux_low_read_btrace
,
6139 linux_low_btrace_conf
,
6147 linux_supports_range_stepping
,
6151 linux_init_signals ()
6153 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6154 to find what the cancel signal actually is. */
6155 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6156 signal (__SIGRTMIN
+1, SIG_IGN
);
6160 #ifdef HAVE_LINUX_REGSETS
6162 initialize_regsets_info (struct regsets_info
*info
)
6164 for (info
->num_regsets
= 0;
6165 info
->regsets
[info
->num_regsets
].size
>= 0;
6166 info
->num_regsets
++)
6172 initialize_low (void)
6174 struct sigaction sigchld_action
;
6175 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6176 set_target_ops (&linux_target_ops
);
6177 set_breakpoint_data (the_low_target
.breakpoint
,
6178 the_low_target
.breakpoint_len
);
6179 linux_init_signals ();
6180 linux_ptrace_init_warnings ();
6182 sigchld_action
.sa_handler
= sigchld_handler
;
6183 sigemptyset (&sigchld_action
.sa_mask
);
6184 sigchld_action
.sa_flags
= SA_RESTART
;
6185 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6187 initialize_low_arch ();