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
->private = xcalloc (1, sizeof (*proc
->private));
362 /* Set the arch when the first LWP stops. */
363 proc
->private->new_inferior
= 1;
365 if (the_low_target
.new_process
!= NULL
)
366 proc
->private->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. But, when we're
511 trying to step past one of our own breakpoints, that happens to
512 have been placed on top of a permanent breakpoint instruction, we
513 shouldn't adjust the PC, otherwise the program would keep
514 trapping the permanent breakpoint forever. */
516 || (!ptid_equal (ptid_of (current_thread
), step_over_bkpt
)
517 && lwp
->stop_pc
== sw_breakpoint_pc
))
518 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
522 struct thread_info
*thr
= get_lwp_thread (lwp
);
524 debug_printf ("CSBB: %s stopped by software breakpoint\n",
525 target_pid_to_str (ptid_of (thr
)));
528 /* Back up the PC if necessary. */
529 if (pc
!= sw_breakpoint_pc
)
531 struct regcache
*regcache
532 = get_thread_regcache (current_thread
, 1);
533 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
536 lwp
->stop_pc
= sw_breakpoint_pc
;
537 lwp
->stop_reason
= LWP_STOPPED_BY_SW_BREAKPOINT
;
538 current_thread
= saved_thread
;
542 if (hardware_breakpoint_inserted_here (pc
))
546 struct thread_info
*thr
= get_lwp_thread (lwp
);
548 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
549 target_pid_to_str (ptid_of (thr
)));
553 lwp
->stop_reason
= LWP_STOPPED_BY_HW_BREAKPOINT
;
554 current_thread
= saved_thread
;
558 current_thread
= saved_thread
;
562 static struct lwp_info
*
563 add_lwp (ptid_t ptid
)
565 struct lwp_info
*lwp
;
567 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
568 memset (lwp
, 0, sizeof (*lwp
));
570 if (the_low_target
.new_thread
!= NULL
)
571 lwp
->arch_private
= the_low_target
.new_thread ();
573 lwp
->thread
= add_thread (ptid
, lwp
);
578 /* Start an inferior process and returns its pid.
579 ALLARGS is a vector of program-name and args. */
582 linux_create_inferior (char *program
, char **allargs
)
584 struct lwp_info
*new_lwp
;
587 struct cleanup
*restore_personality
588 = maybe_disable_address_space_randomization (disable_randomization
);
590 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
596 perror_with_name ("fork");
601 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
603 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
604 signal (__SIGRTMIN
+ 1, SIG_DFL
);
609 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
610 stdout to stderr so that inferior i/o doesn't corrupt the connection.
611 Also, redirect stdin to /dev/null. */
612 if (remote_connection_is_stdio ())
615 open ("/dev/null", O_RDONLY
);
617 if (write (2, "stdin/stdout redirected\n",
618 sizeof ("stdin/stdout redirected\n") - 1) < 0)
620 /* Errors ignored. */;
624 execv (program
, allargs
);
626 execvp (program
, allargs
);
628 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
634 do_cleanups (restore_personality
);
636 linux_add_process (pid
, 0);
638 ptid
= ptid_build (pid
, pid
, 0);
639 new_lwp
= add_lwp (ptid
);
640 new_lwp
->must_set_ptrace_flags
= 1;
645 /* Attach to an inferior process. Returns 0 on success, ERRNO on
649 linux_attach_lwp (ptid_t ptid
)
651 struct lwp_info
*new_lwp
;
652 int lwpid
= ptid_get_lwp (ptid
);
654 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
658 new_lwp
= add_lwp (ptid
);
660 /* We need to wait for SIGSTOP before being able to make the next
661 ptrace call on this LWP. */
662 new_lwp
->must_set_ptrace_flags
= 1;
664 if (linux_proc_pid_is_stopped (lwpid
))
667 debug_printf ("Attached to a stopped process\n");
669 /* The process is definitely stopped. It is in a job control
670 stop, unless the kernel predates the TASK_STOPPED /
671 TASK_TRACED distinction, in which case it might be in a
672 ptrace stop. Make sure it is in a ptrace stop; from there we
673 can kill it, signal it, et cetera.
675 First make sure there is a pending SIGSTOP. Since we are
676 already attached, the process can not transition from stopped
677 to running without a PTRACE_CONT; so we know this signal will
678 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
679 probably already in the queue (unless this kernel is old
680 enough to use TASK_STOPPED for ptrace stops); but since
681 SIGSTOP is not an RT signal, it can only be queued once. */
682 kill_lwp (lwpid
, SIGSTOP
);
684 /* Finally, resume the stopped process. This will deliver the
685 SIGSTOP (or a higher priority signal, just like normal
686 PTRACE_ATTACH), which we'll catch later on. */
687 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
690 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
693 There are several cases to consider here:
695 1) gdbserver has already attached to the process and is being notified
696 of a new thread that is being created.
697 In this case we should ignore that SIGSTOP and resume the
698 process. This is handled below by setting stop_expected = 1,
699 and the fact that add_thread sets last_resume_kind ==
702 2) This is the first thread (the process thread), and we're attaching
703 to it via attach_inferior.
704 In this case we want the process thread to stop.
705 This is handled by having linux_attach set last_resume_kind ==
706 resume_stop after we return.
708 If the pid we are attaching to is also the tgid, we attach to and
709 stop all the existing threads. Otherwise, we attach to pid and
710 ignore any other threads in the same group as this pid.
712 3) GDB is connecting to gdbserver and is requesting an enumeration of all
714 In this case we want the thread to stop.
715 FIXME: This case is currently not properly handled.
716 We should wait for the SIGSTOP but don't. Things work apparently
717 because enough time passes between when we ptrace (ATTACH) and when
718 gdb makes the next ptrace call on the thread.
720 On the other hand, if we are currently trying to stop all threads, we
721 should treat the new thread as if we had sent it a SIGSTOP. This works
722 because we are guaranteed that the add_lwp call above added us to the
723 end of the list, and so the new thread has not yet reached
724 wait_for_sigstop (but will). */
725 new_lwp
->stop_expected
= 1;
730 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
731 already attached. Returns true if a new LWP is found, false
735 attach_proc_task_lwp_callback (ptid_t ptid
)
737 /* Is this a new thread? */
738 if (find_thread_ptid (ptid
) == NULL
)
740 int lwpid
= ptid_get_lwp (ptid
);
744 debug_printf ("Found new lwp %d\n", lwpid
);
746 err
= linux_attach_lwp (ptid
);
748 /* Be quiet if we simply raced with the thread exiting. EPERM
749 is returned if the thread's task still exists, and is marked
750 as exited or zombie, as well as other conditions, so in that
751 case, confirm the status in /proc/PID/status. */
753 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
757 debug_printf ("Cannot attach to lwp %d: "
758 "thread is gone (%d: %s)\n",
759 lwpid
, err
, strerror (err
));
764 warning (_("Cannot attach to lwp %d: %s"),
766 linux_ptrace_attach_fail_reason_string (ptid
, err
));
774 /* Attach to PID. If PID is the tgid, attach to it and all
778 linux_attach (unsigned long pid
)
780 ptid_t ptid
= ptid_build (pid
, pid
, 0);
783 /* Attach to PID. We will check for other threads
785 err
= linux_attach_lwp (ptid
);
787 error ("Cannot attach to process %ld: %s",
788 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
790 linux_add_process (pid
, 1);
794 struct thread_info
*thread
;
796 /* Don't ignore the initial SIGSTOP if we just attached to this
797 process. It will be collected by wait shortly. */
798 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
799 thread
->last_resume_kind
= resume_stop
;
802 /* We must attach to every LWP. If /proc is mounted, use that to
803 find them now. On the one hand, the inferior may be using raw
804 clone instead of using pthreads. On the other hand, even if it
805 is using pthreads, GDB may not be connected yet (thread_db needs
806 to do symbol lookups, through qSymbol). Also, thread_db walks
807 structures in the inferior's address space to find the list of
808 threads/LWPs, and those structures may well be corrupted. Note
809 that once thread_db is loaded, we'll still use it to list threads
810 and associate pthread info with each LWP. */
811 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
822 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
824 struct counter
*counter
= args
;
826 if (ptid_get_pid (entry
->id
) == counter
->pid
)
828 if (++counter
->count
> 1)
836 last_thread_of_process_p (int pid
)
838 struct counter counter
= { pid
, 0 };
840 return (find_inferior (&all_threads
,
841 second_thread_of_pid_p
, &counter
) == NULL
);
847 linux_kill_one_lwp (struct lwp_info
*lwp
)
849 struct thread_info
*thr
= get_lwp_thread (lwp
);
850 int pid
= lwpid_of (thr
);
852 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
853 there is no signal context, and ptrace(PTRACE_KILL) (or
854 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
855 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
856 alternative is to kill with SIGKILL. We only need one SIGKILL
857 per process, not one for each thread. But since we still support
858 linuxthreads, and we also support debugging programs using raw
859 clone without CLONE_THREAD, we send one for each thread. For
860 years, we used PTRACE_KILL only, so we're being a bit paranoid
861 about some old kernels where PTRACE_KILL might work better
862 (dubious if there are any such, but that's why it's paranoia), so
863 we try SIGKILL first, PTRACE_KILL second, and so we're fine
867 kill_lwp (pid
, SIGKILL
);
870 int save_errno
= errno
;
872 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
873 target_pid_to_str (ptid_of (thr
)),
874 save_errno
? strerror (save_errno
) : "OK");
878 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
881 int save_errno
= errno
;
883 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
884 target_pid_to_str (ptid_of (thr
)),
885 save_errno
? strerror (save_errno
) : "OK");
889 /* Kill LWP and wait for it to die. */
892 kill_wait_lwp (struct lwp_info
*lwp
)
894 struct thread_info
*thr
= get_lwp_thread (lwp
);
895 int pid
= ptid_get_pid (ptid_of (thr
));
896 int lwpid
= ptid_get_lwp (ptid_of (thr
));
901 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
905 linux_kill_one_lwp (lwp
);
907 /* Make sure it died. Notes:
909 - The loop is most likely unnecessary.
911 - We don't use linux_wait_for_event as that could delete lwps
912 while we're iterating over them. We're not interested in
913 any pending status at this point, only in making sure all
914 wait status on the kernel side are collected until the
917 - We don't use __WALL here as the __WALL emulation relies on
918 SIGCHLD, and killing a stopped process doesn't generate
919 one, nor an exit status.
921 res
= my_waitpid (lwpid
, &wstat
, 0);
922 if (res
== -1 && errno
== ECHILD
)
923 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
924 } while (res
> 0 && WIFSTOPPED (wstat
));
926 gdb_assert (res
> 0);
929 /* Callback for `find_inferior'. Kills an lwp of a given process,
930 except the leader. */
933 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
935 struct thread_info
*thread
= (struct thread_info
*) entry
;
936 struct lwp_info
*lwp
= get_thread_lwp (thread
);
937 int pid
= * (int *) args
;
939 if (ptid_get_pid (entry
->id
) != pid
)
942 /* We avoid killing the first thread here, because of a Linux kernel (at
943 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
944 the children get a chance to be reaped, it will remain a zombie
947 if (lwpid_of (thread
) == pid
)
950 debug_printf ("lkop: is last of process %s\n",
951 target_pid_to_str (entry
->id
));
962 struct process_info
*process
;
963 struct lwp_info
*lwp
;
965 process
= find_process_pid (pid
);
969 /* If we're killing a running inferior, make sure it is stopped
970 first, as PTRACE_KILL will not work otherwise. */
971 stop_all_lwps (0, NULL
);
973 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
975 /* See the comment in linux_kill_one_lwp. We did not kill the first
976 thread in the list, so do so now. */
977 lwp
= find_lwp_pid (pid_to_ptid (pid
));
982 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
988 the_target
->mourn (process
);
990 /* Since we presently can only stop all lwps of all processes, we
991 need to unstop lwps of other processes. */
992 unstop_all_lwps (0, NULL
);
996 /* Get pending signal of THREAD, for detaching purposes. This is the
997 signal the thread last stopped for, which we need to deliver to the
998 thread when detaching, otherwise, it'd be suppressed/lost. */
1001 get_detach_signal (struct thread_info
*thread
)
1003 enum gdb_signal signo
= GDB_SIGNAL_0
;
1005 struct lwp_info
*lp
= get_thread_lwp (thread
);
1007 if (lp
->status_pending_p
)
1008 status
= lp
->status_pending
;
1011 /* If the thread had been suspended by gdbserver, and it stopped
1012 cleanly, then it'll have stopped with SIGSTOP. But we don't
1013 want to deliver that SIGSTOP. */
1014 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1015 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1018 /* Otherwise, we may need to deliver the signal we
1020 status
= lp
->last_status
;
1023 if (!WIFSTOPPED (status
))
1026 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1027 target_pid_to_str (ptid_of (thread
)));
1031 /* Extended wait statuses aren't real SIGTRAPs. */
1032 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1035 debug_printf ("GPS: lwp %s had stopped with extended "
1036 "status: no pending signal\n",
1037 target_pid_to_str (ptid_of (thread
)));
1041 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1043 if (program_signals_p
&& !program_signals
[signo
])
1046 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1047 target_pid_to_str (ptid_of (thread
)),
1048 gdb_signal_to_string (signo
));
1051 else if (!program_signals_p
1052 /* If we have no way to know which signals GDB does not
1053 want to have passed to the program, assume
1054 SIGTRAP/SIGINT, which is GDB's default. */
1055 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1058 debug_printf ("GPS: lwp %s had signal %s, "
1059 "but we don't know if we should pass it. "
1060 "Default to not.\n",
1061 target_pid_to_str (ptid_of (thread
)),
1062 gdb_signal_to_string (signo
));
1068 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1069 target_pid_to_str (ptid_of (thread
)),
1070 gdb_signal_to_string (signo
));
1072 return WSTOPSIG (status
);
1077 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1079 struct thread_info
*thread
= (struct thread_info
*) entry
;
1080 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1081 int pid
= * (int *) args
;
1084 if (ptid_get_pid (entry
->id
) != pid
)
1087 /* If there is a pending SIGSTOP, get rid of it. */
1088 if (lwp
->stop_expected
)
1091 debug_printf ("Sending SIGCONT to %s\n",
1092 target_pid_to_str (ptid_of (thread
)));
1094 kill_lwp (lwpid_of (thread
), SIGCONT
);
1095 lwp
->stop_expected
= 0;
1098 /* Flush any pending changes to the process's registers. */
1099 regcache_invalidate_thread (thread
);
1101 /* Pass on any pending signal for this thread. */
1102 sig
= get_detach_signal (thread
);
1104 /* Finally, let it resume. */
1105 if (the_low_target
.prepare_to_resume
!= NULL
)
1106 the_low_target
.prepare_to_resume (lwp
);
1107 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1108 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1109 error (_("Can't detach %s: %s"),
1110 target_pid_to_str (ptid_of (thread
)),
1118 linux_detach (int pid
)
1120 struct process_info
*process
;
1122 process
= find_process_pid (pid
);
1123 if (process
== NULL
)
1126 /* Stop all threads before detaching. First, ptrace requires that
1127 the thread is stopped to sucessfully detach. Second, thread_db
1128 may need to uninstall thread event breakpoints from memory, which
1129 only works with a stopped process anyway. */
1130 stop_all_lwps (0, NULL
);
1132 #ifdef USE_THREAD_DB
1133 thread_db_detach (process
);
1136 /* Stabilize threads (move out of jump pads). */
1137 stabilize_threads ();
1139 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1141 the_target
->mourn (process
);
1143 /* Since we presently can only stop all lwps of all processes, we
1144 need to unstop lwps of other processes. */
1145 unstop_all_lwps (0, NULL
);
1149 /* Remove all LWPs that belong to process PROC from the lwp list. */
1152 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1154 struct thread_info
*thread
= (struct thread_info
*) entry
;
1155 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1156 struct process_info
*process
= proc
;
1158 if (pid_of (thread
) == pid_of (process
))
1165 linux_mourn (struct process_info
*process
)
1167 struct process_info_private
*priv
;
1169 #ifdef USE_THREAD_DB
1170 thread_db_mourn (process
);
1173 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1175 /* Freeing all private data. */
1176 priv
= process
->private;
1177 free (priv
->arch_private
);
1179 process
->private = NULL
;
1181 remove_process (process
);
1185 linux_join (int pid
)
1190 ret
= my_waitpid (pid
, &status
, 0);
1191 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1193 } while (ret
!= -1 || errno
!= ECHILD
);
1196 /* Return nonzero if the given thread is still alive. */
1198 linux_thread_alive (ptid_t ptid
)
1200 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1202 /* We assume we always know if a thread exits. If a whole process
1203 exited but we still haven't been able to report it to GDB, we'll
1204 hold on to the last lwp of the dead process. */
1211 /* Return 1 if this lwp still has an interesting status pending. If
1212 not (e.g., it had stopped for a breakpoint that is gone), return
1216 thread_still_has_status_pending_p (struct thread_info
*thread
)
1218 struct lwp_info
*lp
= get_thread_lwp (thread
);
1220 if (!lp
->status_pending_p
)
1223 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1224 report any status pending the LWP may have. */
1225 if (thread
->last_resume_kind
== resume_stop
1226 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1229 if (thread
->last_resume_kind
!= resume_stop
1230 && (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1231 || lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
))
1233 struct thread_info
*saved_thread
;
1237 gdb_assert (lp
->last_status
!= 0);
1241 saved_thread
= current_thread
;
1242 current_thread
= thread
;
1244 if (pc
!= lp
->stop_pc
)
1247 debug_printf ("PC of %ld changed\n",
1251 else if (lp
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
1252 && !(*the_low_target
.breakpoint_at
) (pc
))
1255 debug_printf ("previous SW breakpoint of %ld gone\n",
1259 else if (lp
->stop_reason
== LWP_STOPPED_BY_HW_BREAKPOINT
1260 && !hardware_breakpoint_inserted_here (pc
))
1263 debug_printf ("previous HW breakpoint of %ld gone\n",
1268 current_thread
= saved_thread
;
1273 debug_printf ("discarding pending breakpoint status\n");
1274 lp
->status_pending_p
= 0;
1282 /* Return 1 if this lwp has an interesting status pending. */
1284 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1286 struct thread_info
*thread
= (struct thread_info
*) entry
;
1287 struct lwp_info
*lp
= get_thread_lwp (thread
);
1288 ptid_t ptid
= * (ptid_t
*) arg
;
1290 /* Check if we're only interested in events from a specific process
1291 or a specific LWP. */
1292 if (!ptid_match (ptid_of (thread
), ptid
))
1295 if (lp
->status_pending_p
1296 && !thread_still_has_status_pending_p (thread
))
1298 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1302 return lp
->status_pending_p
;
1306 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1308 ptid_t ptid
= *(ptid_t
*) data
;
1311 if (ptid_get_lwp (ptid
) != 0)
1312 lwp
= ptid_get_lwp (ptid
);
1314 lwp
= ptid_get_pid (ptid
);
1316 if (ptid_get_lwp (entry
->id
) == lwp
)
1323 find_lwp_pid (ptid_t ptid
)
1325 struct inferior_list_entry
*thread
1326 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1331 return get_thread_lwp ((struct thread_info
*) thread
);
1334 /* Return the number of known LWPs in the tgid given by PID. */
1339 struct inferior_list_entry
*inf
, *tmp
;
1342 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1344 if (ptid_get_pid (inf
->id
) == pid
)
1351 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1352 their exits until all other threads in the group have exited. */
1355 check_zombie_leaders (void)
1357 struct process_info
*proc
, *tmp
;
1359 ALL_PROCESSES (proc
, tmp
)
1361 pid_t leader_pid
= pid_of (proc
);
1362 struct lwp_info
*leader_lp
;
1364 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1367 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1368 "num_lwps=%d, zombie=%d\n",
1369 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1370 linux_proc_pid_is_zombie (leader_pid
));
1372 if (leader_lp
!= NULL
1373 /* Check if there are other threads in the group, as we may
1374 have raced with the inferior simply exiting. */
1375 && !last_thread_of_process_p (leader_pid
)
1376 && linux_proc_pid_is_zombie (leader_pid
))
1378 /* A leader zombie can mean one of two things:
1380 - It exited, and there's an exit status pending
1381 available, or only the leader exited (not the whole
1382 program). In the latter case, we can't waitpid the
1383 leader's exit status until all other threads are gone.
1385 - There are 3 or more threads in the group, and a thread
1386 other than the leader exec'd. On an exec, the Linux
1387 kernel destroys all other threads (except the execing
1388 one) in the thread group, and resets the execing thread's
1389 tid to the tgid. No exit notification is sent for the
1390 execing thread -- from the ptracer's perspective, it
1391 appears as though the execing thread just vanishes.
1392 Until we reap all other threads except the leader and the
1393 execing thread, the leader will be zombie, and the
1394 execing thread will be in `D (disc sleep)'. As soon as
1395 all other threads are reaped, the execing thread changes
1396 it's tid to the tgid, and the previous (zombie) leader
1397 vanishes, giving place to the "new" leader. We could try
1398 distinguishing the exit and exec cases, by waiting once
1399 more, and seeing if something comes out, but it doesn't
1400 sound useful. The previous leader _does_ go away, and
1401 we'll re-add the new one once we see the exec event
1402 (which is just the same as what would happen if the
1403 previous leader did exit voluntarily before some other
1408 "CZL: Thread group leader %d zombie "
1409 "(it exited, or another thread execd).\n",
1412 delete_lwp (leader_lp
);
1417 /* Callback for `find_inferior'. Returns the first LWP that is not
1418 stopped. ARG is a PTID filter. */
1421 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1423 struct thread_info
*thr
= (struct thread_info
*) entry
;
1424 struct lwp_info
*lwp
;
1425 ptid_t filter
= *(ptid_t
*) arg
;
1427 if (!ptid_match (ptid_of (thr
), filter
))
1430 lwp
= get_thread_lwp (thr
);
1437 /* This function should only be called if the LWP got a SIGTRAP.
1439 Handle any tracepoint steps or hits. Return true if a tracepoint
1440 event was handled, 0 otherwise. */
1443 handle_tracepoints (struct lwp_info
*lwp
)
1445 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1446 int tpoint_related_event
= 0;
1448 gdb_assert (lwp
->suspended
== 0);
1450 /* If this tracepoint hit causes a tracing stop, we'll immediately
1451 uninsert tracepoints. To do this, we temporarily pause all
1452 threads, unpatch away, and then unpause threads. We need to make
1453 sure the unpausing doesn't resume LWP too. */
1456 /* And we need to be sure that any all-threads-stopping doesn't try
1457 to move threads out of the jump pads, as it could deadlock the
1458 inferior (LWP could be in the jump pad, maybe even holding the
1461 /* Do any necessary step collect actions. */
1462 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1464 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1466 /* See if we just hit a tracepoint and do its main collect
1468 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1472 gdb_assert (lwp
->suspended
== 0);
1473 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1475 if (tpoint_related_event
)
1478 debug_printf ("got a tracepoint event\n");
1485 /* Convenience wrapper. Returns true if LWP is presently collecting a
1489 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1490 struct fast_tpoint_collect_status
*status
)
1492 CORE_ADDR thread_area
;
1493 struct thread_info
*thread
= get_lwp_thread (lwp
);
1495 if (the_low_target
.get_thread_area
== NULL
)
1498 /* Get the thread area address. This is used to recognize which
1499 thread is which when tracing with the in-process agent library.
1500 We don't read anything from the address, and treat it as opaque;
1501 it's the address itself that we assume is unique per-thread. */
1502 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1505 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1508 /* The reason we resume in the caller, is because we want to be able
1509 to pass lwp->status_pending as WSTAT, and we need to clear
1510 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1511 refuses to resume. */
1514 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1516 struct thread_info
*saved_thread
;
1518 saved_thread
= current_thread
;
1519 current_thread
= get_lwp_thread (lwp
);
1522 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1523 && supports_fast_tracepoints ()
1524 && agent_loaded_p ())
1526 struct fast_tpoint_collect_status status
;
1530 debug_printf ("Checking whether LWP %ld needs to move out of the "
1532 lwpid_of (current_thread
));
1534 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1537 || (WSTOPSIG (*wstat
) != SIGILL
1538 && WSTOPSIG (*wstat
) != SIGFPE
1539 && WSTOPSIG (*wstat
) != SIGSEGV
1540 && WSTOPSIG (*wstat
) != SIGBUS
))
1542 lwp
->collecting_fast_tracepoint
= r
;
1546 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1548 /* Haven't executed the original instruction yet.
1549 Set breakpoint there, and wait till it's hit,
1550 then single-step until exiting the jump pad. */
1551 lwp
->exit_jump_pad_bkpt
1552 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1556 debug_printf ("Checking whether LWP %ld needs to move out of "
1557 "the jump pad...it does\n",
1558 lwpid_of (current_thread
));
1559 current_thread
= saved_thread
;
1566 /* If we get a synchronous signal while collecting, *and*
1567 while executing the (relocated) original instruction,
1568 reset the PC to point at the tpoint address, before
1569 reporting to GDB. Otherwise, it's an IPA lib bug: just
1570 report the signal to GDB, and pray for the best. */
1572 lwp
->collecting_fast_tracepoint
= 0;
1575 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1576 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1579 struct regcache
*regcache
;
1581 /* The si_addr on a few signals references the address
1582 of the faulting instruction. Adjust that as
1584 if ((WSTOPSIG (*wstat
) == SIGILL
1585 || WSTOPSIG (*wstat
) == SIGFPE
1586 || WSTOPSIG (*wstat
) == SIGBUS
1587 || WSTOPSIG (*wstat
) == SIGSEGV
)
1588 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1589 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1590 /* Final check just to make sure we don't clobber
1591 the siginfo of non-kernel-sent signals. */
1592 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1594 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1595 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1596 (PTRACE_TYPE_ARG3
) 0, &info
);
1599 regcache
= get_thread_regcache (current_thread
, 1);
1600 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1601 lwp
->stop_pc
= status
.tpoint_addr
;
1603 /* Cancel any fast tracepoint lock this thread was
1605 force_unlock_trace_buffer ();
1608 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1611 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1612 "stopping all threads momentarily.\n");
1614 stop_all_lwps (1, lwp
);
1616 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1617 lwp
->exit_jump_pad_bkpt
= NULL
;
1619 unstop_all_lwps (1, lwp
);
1621 gdb_assert (lwp
->suspended
>= 0);
1627 debug_printf ("Checking whether LWP %ld needs to move out of the "
1629 lwpid_of (current_thread
));
1631 current_thread
= saved_thread
;
1635 /* Enqueue one signal in the "signals to report later when out of the
1639 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1641 struct pending_signals
*p_sig
;
1642 struct thread_info
*thread
= get_lwp_thread (lwp
);
1645 debug_printf ("Deferring signal %d for LWP %ld.\n",
1646 WSTOPSIG (*wstat
), lwpid_of (thread
));
1650 struct pending_signals
*sig
;
1652 for (sig
= lwp
->pending_signals_to_report
;
1655 debug_printf (" Already queued %d\n",
1658 debug_printf (" (no more currently queued signals)\n");
1661 /* Don't enqueue non-RT signals if they are already in the deferred
1662 queue. (SIGSTOP being the easiest signal to see ending up here
1664 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1666 struct pending_signals
*sig
;
1668 for (sig
= lwp
->pending_signals_to_report
;
1672 if (sig
->signal
== WSTOPSIG (*wstat
))
1675 debug_printf ("Not requeuing already queued non-RT signal %d"
1684 p_sig
= xmalloc (sizeof (*p_sig
));
1685 p_sig
->prev
= lwp
->pending_signals_to_report
;
1686 p_sig
->signal
= WSTOPSIG (*wstat
);
1687 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1688 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1691 lwp
->pending_signals_to_report
= p_sig
;
1694 /* Dequeue one signal from the "signals to report later when out of
1695 the jump pad" list. */
1698 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1700 struct thread_info
*thread
= get_lwp_thread (lwp
);
1702 if (lwp
->pending_signals_to_report
!= NULL
)
1704 struct pending_signals
**p_sig
;
1706 p_sig
= &lwp
->pending_signals_to_report
;
1707 while ((*p_sig
)->prev
!= NULL
)
1708 p_sig
= &(*p_sig
)->prev
;
1710 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1711 if ((*p_sig
)->info
.si_signo
!= 0)
1712 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1718 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1719 WSTOPSIG (*wstat
), lwpid_of (thread
));
1723 struct pending_signals
*sig
;
1725 for (sig
= lwp
->pending_signals_to_report
;
1728 debug_printf (" Still queued %d\n",
1731 debug_printf (" (no more queued signals)\n");
1740 /* Fetch the possibly triggered data watchpoint info and store it in
1743 On some archs, like x86, that use debug registers to set
1744 watchpoints, it's possible that the way to know which watched
1745 address trapped, is to check the register that is used to select
1746 which address to watch. Problem is, between setting the watchpoint
1747 and reading back which data address trapped, the user may change
1748 the set of watchpoints, and, as a consequence, GDB changes the
1749 debug registers in the inferior. To avoid reading back a stale
1750 stopped-data-address when that happens, we cache in LP the fact
1751 that a watchpoint trapped, and the corresponding data address, as
1752 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1753 registers meanwhile, we have the cached data we can rely on. */
1756 check_stopped_by_watchpoint (struct lwp_info
*child
)
1758 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1760 struct thread_info
*saved_thread
;
1762 saved_thread
= current_thread
;
1763 current_thread
= get_lwp_thread (child
);
1765 if (the_low_target
.stopped_by_watchpoint ())
1767 child
->stop_reason
= LWP_STOPPED_BY_WATCHPOINT
;
1769 if (the_low_target
.stopped_data_address
!= NULL
)
1770 child
->stopped_data_address
1771 = the_low_target
.stopped_data_address ();
1773 child
->stopped_data_address
= 0;
1776 current_thread
= saved_thread
;
1779 return child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
1782 /* Do low-level handling of the event, and check if we should go on
1783 and pass it to caller code. Return the affected lwp if we are, or
1786 static struct lwp_info
*
1787 linux_low_filter_event (int lwpid
, int wstat
)
1789 struct lwp_info
*child
;
1790 struct thread_info
*thread
;
1791 int have_stop_pc
= 0;
1793 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1795 /* If we didn't find a process, one of two things presumably happened:
1796 - A process we started and then detached from has exited. Ignore it.
1797 - A process we are controlling has forked and the new child's stop
1798 was reported to us by the kernel. Save its PID. */
1799 if (child
== NULL
&& WIFSTOPPED (wstat
))
1801 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1804 else if (child
== NULL
)
1807 thread
= get_lwp_thread (child
);
1811 child
->last_status
= wstat
;
1813 /* Check if the thread has exited. */
1814 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1817 debug_printf ("LLFE: %d exited.\n", lwpid
);
1818 if (num_lwps (pid_of (thread
)) > 1)
1821 /* If there is at least one more LWP, then the exit signal was
1822 not the end of the debugged application and should be
1829 /* This was the last lwp in the process. Since events are
1830 serialized to GDB core, and we can't report this one
1831 right now, but GDB core and the other target layers will
1832 want to be notified about the exit code/signal, leave the
1833 status pending for the next time we're able to report
1835 mark_lwp_dead (child
, wstat
);
1840 gdb_assert (WIFSTOPPED (wstat
));
1842 if (WIFSTOPPED (wstat
))
1844 struct process_info
*proc
;
1846 /* Architecture-specific setup after inferior is running. This
1847 needs to happen after we have attached to the inferior and it
1848 is stopped for the first time, but before we access any
1849 inferior registers. */
1850 proc
= find_process_pid (pid_of (thread
));
1851 if (proc
->private->new_inferior
)
1853 struct thread_info
*saved_thread
;
1855 saved_thread
= current_thread
;
1856 current_thread
= thread
;
1858 the_low_target
.arch_setup ();
1860 current_thread
= saved_thread
;
1862 proc
->private->new_inferior
= 0;
1866 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1868 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1870 linux_enable_event_reporting (lwpid
, proc
->attached
);
1871 child
->must_set_ptrace_flags
= 0;
1874 /* Be careful to not overwrite stop_pc until
1875 check_stopped_by_breakpoint is called. */
1876 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1877 && linux_is_extended_waitstatus (wstat
))
1879 child
->stop_pc
= get_pc (child
);
1880 handle_extended_wait (child
, wstat
);
1884 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1885 && check_stopped_by_watchpoint (child
))
1887 else if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
1889 if (check_stopped_by_breakpoint (child
))
1894 child
->stop_pc
= get_pc (child
);
1896 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1897 && child
->stop_expected
)
1900 debug_printf ("Expected stop.\n");
1901 child
->stop_expected
= 0;
1903 if (thread
->last_resume_kind
== resume_stop
)
1905 /* We want to report the stop to the core. Treat the
1906 SIGSTOP as a normal event. */
1908 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1910 /* Stopping threads. We don't want this SIGSTOP to end up
1916 /* Filter out the event. */
1917 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1922 child
->status_pending_p
= 1;
1923 child
->status_pending
= wstat
;
1927 /* Resume LWPs that are currently stopped without any pending status
1928 to report, but are resumed from the core's perspective. */
1931 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
1933 struct thread_info
*thread
= (struct thread_info
*) entry
;
1934 struct lwp_info
*lp
= get_thread_lwp (thread
);
1937 && !lp
->status_pending_p
1938 && thread
->last_resume_kind
!= resume_stop
1939 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1941 int step
= thread
->last_resume_kind
== resume_step
;
1944 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
1945 target_pid_to_str (ptid_of (thread
)),
1946 paddress (lp
->stop_pc
),
1949 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
1953 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1954 match FILTER_PTID (leaving others pending). The PTIDs can be:
1955 minus_one_ptid, to specify any child; a pid PTID, specifying all
1956 lwps of a thread group; or a PTID representing a single lwp. Store
1957 the stop status through the status pointer WSTAT. OPTIONS is
1958 passed to the waitpid call. Return 0 if no event was found and
1959 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1960 was found. Return the PID of the stopped child otherwise. */
1963 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1964 int *wstatp
, int options
)
1966 struct thread_info
*event_thread
;
1967 struct lwp_info
*event_child
, *requested_child
;
1968 sigset_t block_mask
, prev_mask
;
1971 /* N.B. event_thread points to the thread_info struct that contains
1972 event_child. Keep them in sync. */
1973 event_thread
= NULL
;
1975 requested_child
= NULL
;
1977 /* Check for a lwp with a pending status. */
1979 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
1981 event_thread
= (struct thread_info
*)
1982 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
1983 if (event_thread
!= NULL
)
1984 event_child
= get_thread_lwp (event_thread
);
1985 if (debug_threads
&& event_thread
)
1986 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
1988 else if (!ptid_equal (filter_ptid
, null_ptid
))
1990 requested_child
= find_lwp_pid (filter_ptid
);
1992 if (stopping_threads
== NOT_STOPPING_THREADS
1993 && requested_child
->status_pending_p
1994 && requested_child
->collecting_fast_tracepoint
)
1996 enqueue_one_deferred_signal (requested_child
,
1997 &requested_child
->status_pending
);
1998 requested_child
->status_pending_p
= 0;
1999 requested_child
->status_pending
= 0;
2000 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2003 if (requested_child
->suspended
2004 && requested_child
->status_pending_p
)
2006 internal_error (__FILE__
, __LINE__
,
2007 "requesting an event out of a"
2008 " suspended child?");
2011 if (requested_child
->status_pending_p
)
2013 event_child
= requested_child
;
2014 event_thread
= get_lwp_thread (event_child
);
2018 if (event_child
!= NULL
)
2021 debug_printf ("Got an event from pending child %ld (%04x)\n",
2022 lwpid_of (event_thread
), event_child
->status_pending
);
2023 *wstatp
= event_child
->status_pending
;
2024 event_child
->status_pending_p
= 0;
2025 event_child
->status_pending
= 0;
2026 current_thread
= event_thread
;
2027 return lwpid_of (event_thread
);
2030 /* But if we don't find a pending event, we'll have to wait.
2032 We only enter this loop if no process has a pending wait status.
2033 Thus any action taken in response to a wait status inside this
2034 loop is responding as soon as we detect the status, not after any
2037 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2038 all signals while here. */
2039 sigfillset (&block_mask
);
2040 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2042 /* Always pull all events out of the kernel. We'll randomly select
2043 an event LWP out of all that have events, to prevent
2045 while (event_child
== NULL
)
2049 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2052 - If the thread group leader exits while other threads in the
2053 thread group still exist, waitpid(TGID, ...) hangs. That
2054 waitpid won't return an exit status until the other threads
2055 in the group are reaped.
2057 - When a non-leader thread execs, that thread just vanishes
2058 without reporting an exit (so we'd hang if we waited for it
2059 explicitly in that case). The exec event is reported to
2060 the TGID pid (although we don't currently enable exec
2063 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2066 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2067 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2073 debug_printf ("LLW: waitpid %ld received %s\n",
2074 (long) ret
, status_to_str (*wstatp
));
2077 /* Filter all events. IOW, leave all events pending. We'll
2078 randomly select an event LWP out of all that have events
2080 linux_low_filter_event (ret
, *wstatp
);
2081 /* Retry until nothing comes out of waitpid. A single
2082 SIGCHLD can indicate more than one child stopped. */
2086 /* Now that we've pulled all events out of the kernel, resume
2087 LWPs that don't have an interesting event to report. */
2088 if (stopping_threads
== NOT_STOPPING_THREADS
)
2089 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2091 /* ... and find an LWP with a status to report to the core, if
2093 event_thread
= (struct thread_info
*)
2094 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2095 if (event_thread
!= NULL
)
2097 event_child
= get_thread_lwp (event_thread
);
2098 *wstatp
= event_child
->status_pending
;
2099 event_child
->status_pending_p
= 0;
2100 event_child
->status_pending
= 0;
2104 /* Check for zombie thread group leaders. Those can't be reaped
2105 until all other threads in the thread group are. */
2106 check_zombie_leaders ();
2108 /* If there are no resumed children left in the set of LWPs we
2109 want to wait for, bail. We can't just block in
2110 waitpid/sigsuspend, because lwps might have been left stopped
2111 in trace-stop state, and we'd be stuck forever waiting for
2112 their status to change (which would only happen if we resumed
2113 them). Even if WNOHANG is set, this return code is preferred
2114 over 0 (below), as it is more detailed. */
2115 if ((find_inferior (&all_threads
,
2116 not_stopped_callback
,
2117 &wait_ptid
) == NULL
))
2120 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2121 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2125 /* No interesting event to report to the caller. */
2126 if ((options
& WNOHANG
))
2129 debug_printf ("WNOHANG set, no event found\n");
2131 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2135 /* Block until we get an event reported with SIGCHLD. */
2137 debug_printf ("sigsuspend'ing\n");
2139 sigsuspend (&prev_mask
);
2140 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2144 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2146 current_thread
= event_thread
;
2148 /* Check for thread exit. */
2149 if (! WIFSTOPPED (*wstatp
))
2151 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2154 debug_printf ("LWP %d is the last lwp of process. "
2155 "Process %ld exiting.\n",
2156 pid_of (event_thread
), lwpid_of (event_thread
));
2157 return lwpid_of (event_thread
);
2160 return lwpid_of (event_thread
);
2163 /* Wait for an event from child(ren) PTID. PTIDs can be:
2164 minus_one_ptid, to specify any child; a pid PTID, specifying all
2165 lwps of a thread group; or a PTID representing a single lwp. Store
2166 the stop status through the status pointer WSTAT. OPTIONS is
2167 passed to the waitpid call. Return 0 if no event was found and
2168 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2169 was found. Return the PID of the stopped child otherwise. */
2172 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2174 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2177 /* Count the LWP's that have had events. */
2180 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2182 struct thread_info
*thread
= (struct thread_info
*) entry
;
2185 gdb_assert (count
!= NULL
);
2187 /* Count only resumed LWPs that have an event pending. */
2188 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2189 && thread
->last_resume_kind
!= resume_stop
2190 && thread
->status_pending_p
)
2196 /* Select the LWP (if any) that is currently being single-stepped. */
2199 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2201 struct thread_info
*thread
= (struct thread_info
*) entry
;
2202 struct lwp_info
*lp
= get_thread_lwp (thread
);
2204 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2205 && thread
->last_resume_kind
== resume_step
2206 && lp
->status_pending_p
)
2212 /* Select the Nth LWP that has had a SIGTRAP event that should be
2216 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2218 struct thread_info
*thread
= (struct thread_info
*) entry
;
2219 int *selector
= data
;
2221 gdb_assert (selector
!= NULL
);
2223 /* Select only resumed LWPs that have an event pending. */
2224 if (thread
->last_resume_kind
!= resume_stop
2225 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2226 && thread
->status_pending_p
)
2227 if ((*selector
)-- == 0)
2233 /* Select one LWP out of those that have events pending. */
2236 select_event_lwp (struct lwp_info
**orig_lp
)
2239 int random_selector
;
2240 struct thread_info
*event_thread
= NULL
;
2242 /* In all-stop, give preference to the LWP that is being
2243 single-stepped. There will be at most one, and it's the LWP that
2244 the core is most interested in. If we didn't do this, then we'd
2245 have to handle pending step SIGTRAPs somehow in case the core
2246 later continues the previously-stepped thread, otherwise we'd
2247 report the pending SIGTRAP, and the core, not having stepped the
2248 thread, wouldn't understand what the trap was for, and therefore
2249 would report it to the user as a random signal. */
2253 = (struct thread_info
*) find_inferior (&all_threads
,
2254 select_singlestep_lwp_callback
,
2256 if (event_thread
!= NULL
)
2259 debug_printf ("SEL: Select single-step %s\n",
2260 target_pid_to_str (ptid_of (event_thread
)));
2263 if (event_thread
== NULL
)
2265 /* No single-stepping LWP. Select one at random, out of those
2266 which have had SIGTRAP events. */
2268 /* First see how many SIGTRAP events we have. */
2269 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2271 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2272 random_selector
= (int)
2273 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2275 if (debug_threads
&& num_events
> 1)
2276 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2277 num_events
, random_selector
);
2280 = (struct thread_info
*) find_inferior (&all_threads
,
2281 select_event_lwp_callback
,
2285 if (event_thread
!= NULL
)
2287 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2289 /* Switch the event LWP. */
2290 *orig_lp
= event_lp
;
2294 /* Decrement the suspend count of an LWP. */
2297 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2299 struct thread_info
*thread
= (struct thread_info
*) entry
;
2300 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2302 /* Ignore EXCEPT. */
2308 gdb_assert (lwp
->suspended
>= 0);
2312 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2316 unsuspend_all_lwps (struct lwp_info
*except
)
2318 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2321 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2322 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2324 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2325 static ptid_t
linux_wait_1 (ptid_t ptid
,
2326 struct target_waitstatus
*ourstatus
,
2327 int target_options
);
2329 /* Stabilize threads (move out of jump pads).
2331 If a thread is midway collecting a fast tracepoint, we need to
2332 finish the collection and move it out of the jump pad before
2333 reporting the signal.
2335 This avoids recursion while collecting (when a signal arrives
2336 midway, and the signal handler itself collects), which would trash
2337 the trace buffer. In case the user set a breakpoint in a signal
2338 handler, this avoids the backtrace showing the jump pad, etc..
2339 Most importantly, there are certain things we can't do safely if
2340 threads are stopped in a jump pad (or in its callee's). For
2343 - starting a new trace run. A thread still collecting the
2344 previous run, could trash the trace buffer when resumed. The trace
2345 buffer control structures would have been reset but the thread had
2346 no way to tell. The thread could even midway memcpy'ing to the
2347 buffer, which would mean that when resumed, it would clobber the
2348 trace buffer that had been set for a new run.
2350 - we can't rewrite/reuse the jump pads for new tracepoints
2351 safely. Say you do tstart while a thread is stopped midway while
2352 collecting. When the thread is later resumed, it finishes the
2353 collection, and returns to the jump pad, to execute the original
2354 instruction that was under the tracepoint jump at the time the
2355 older run had been started. If the jump pad had been rewritten
2356 since for something else in the new run, the thread would now
2357 execute the wrong / random instructions. */
2360 linux_stabilize_threads (void)
2362 struct thread_info
*saved_thread
;
2363 struct thread_info
*thread_stuck
;
2366 = (struct thread_info
*) find_inferior (&all_threads
,
2367 stuck_in_jump_pad_callback
,
2369 if (thread_stuck
!= NULL
)
2372 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2373 lwpid_of (thread_stuck
));
2377 saved_thread
= current_thread
;
2379 stabilizing_threads
= 1;
2382 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2384 /* Loop until all are stopped out of the jump pads. */
2385 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2387 struct target_waitstatus ourstatus
;
2388 struct lwp_info
*lwp
;
2391 /* Note that we go through the full wait even loop. While
2392 moving threads out of jump pad, we need to be able to step
2393 over internal breakpoints and such. */
2394 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2396 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2398 lwp
= get_thread_lwp (current_thread
);
2403 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2404 || current_thread
->last_resume_kind
== resume_stop
)
2406 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2407 enqueue_one_deferred_signal (lwp
, &wstat
);
2412 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2414 stabilizing_threads
= 0;
2416 current_thread
= saved_thread
;
2421 = (struct thread_info
*) find_inferior (&all_threads
,
2422 stuck_in_jump_pad_callback
,
2424 if (thread_stuck
!= NULL
)
2425 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2426 lwpid_of (thread_stuck
));
2430 static void async_file_mark (void);
2432 /* Convenience function that is called when the kernel reports an
2433 event that is not passed out to GDB. */
2436 ignore_event (struct target_waitstatus
*ourstatus
)
2438 /* If we got an event, there may still be others, as a single
2439 SIGCHLD can indicate more than one child stopped. This forces
2440 another target_wait call. */
2443 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2447 /* Wait for process, returns status. */
2450 linux_wait_1 (ptid_t ptid
,
2451 struct target_waitstatus
*ourstatus
, int target_options
)
2454 struct lwp_info
*event_child
;
2457 int step_over_finished
;
2458 int bp_explains_trap
;
2459 int maybe_internal_trap
;
2467 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2470 /* Translate generic target options into linux options. */
2472 if (target_options
& TARGET_WNOHANG
)
2475 bp_explains_trap
= 0;
2478 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2480 if (ptid_equal (step_over_bkpt
, null_ptid
))
2481 pid
= linux_wait_for_event (ptid
, &w
, options
);
2485 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2486 target_pid_to_str (step_over_bkpt
));
2487 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2492 gdb_assert (target_options
& TARGET_WNOHANG
);
2496 debug_printf ("linux_wait_1 ret = null_ptid, "
2497 "TARGET_WAITKIND_IGNORE\n");
2501 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2508 debug_printf ("linux_wait_1 ret = null_ptid, "
2509 "TARGET_WAITKIND_NO_RESUMED\n");
2513 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2517 event_child
= get_thread_lwp (current_thread
);
2519 /* linux_wait_for_event only returns an exit status for the last
2520 child of a process. Report it. */
2521 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2525 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2526 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2530 debug_printf ("linux_wait_1 ret = %s, exited with "
2532 target_pid_to_str (ptid_of (current_thread
)),
2539 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2540 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2544 debug_printf ("linux_wait_1 ret = %s, terminated with "
2546 target_pid_to_str (ptid_of (current_thread
)),
2552 return ptid_of (current_thread
);
2555 /* If this event was not handled before, and is not a SIGTRAP, we
2556 report it. SIGILL and SIGSEGV are also treated as traps in case
2557 a breakpoint is inserted at the current PC. If this target does
2558 not support internal breakpoints at all, we also report the
2559 SIGTRAP without further processing; it's of no concern to us. */
2561 = (supports_breakpoints ()
2562 && (WSTOPSIG (w
) == SIGTRAP
2563 || ((WSTOPSIG (w
) == SIGILL
2564 || WSTOPSIG (w
) == SIGSEGV
)
2565 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2567 if (maybe_internal_trap
)
2569 /* Handle anything that requires bookkeeping before deciding to
2570 report the event or continue waiting. */
2572 /* First check if we can explain the SIGTRAP with an internal
2573 breakpoint, or if we should possibly report the event to GDB.
2574 Do this before anything that may remove or insert a
2576 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2578 /* We have a SIGTRAP, possibly a step-over dance has just
2579 finished. If so, tweak the state machine accordingly,
2580 reinsert breakpoints and delete any reinsert (software
2581 single-step) breakpoints. */
2582 step_over_finished
= finish_step_over (event_child
);
2584 /* Now invoke the callbacks of any internal breakpoints there. */
2585 check_breakpoints (event_child
->stop_pc
);
2587 /* Handle tracepoint data collecting. This may overflow the
2588 trace buffer, and cause a tracing stop, removing
2590 trace_event
= handle_tracepoints (event_child
);
2592 if (bp_explains_trap
)
2594 /* If we stepped or ran into an internal breakpoint, we've
2595 already handled it. So next time we resume (from this
2596 PC), we should step over it. */
2598 debug_printf ("Hit a gdbserver breakpoint.\n");
2600 if (breakpoint_here (event_child
->stop_pc
))
2601 event_child
->need_step_over
= 1;
2606 /* We have some other signal, possibly a step-over dance was in
2607 progress, and it should be cancelled too. */
2608 step_over_finished
= finish_step_over (event_child
);
2611 /* We have all the data we need. Either report the event to GDB, or
2612 resume threads and keep waiting for more. */
2614 /* If we're collecting a fast tracepoint, finish the collection and
2615 move out of the jump pad before delivering a signal. See
2616 linux_stabilize_threads. */
2619 && WSTOPSIG (w
) != SIGTRAP
2620 && supports_fast_tracepoints ()
2621 && agent_loaded_p ())
2624 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2625 "to defer or adjust it.\n",
2626 WSTOPSIG (w
), lwpid_of (current_thread
));
2628 /* Allow debugging the jump pad itself. */
2629 if (current_thread
->last_resume_kind
!= resume_step
2630 && maybe_move_out_of_jump_pad (event_child
, &w
))
2632 enqueue_one_deferred_signal (event_child
, &w
);
2635 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2636 WSTOPSIG (w
), lwpid_of (current_thread
));
2638 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2640 return ignore_event (ourstatus
);
2644 if (event_child
->collecting_fast_tracepoint
)
2647 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2648 "Check if we're already there.\n",
2649 lwpid_of (current_thread
),
2650 event_child
->collecting_fast_tracepoint
);
2654 event_child
->collecting_fast_tracepoint
2655 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2657 if (event_child
->collecting_fast_tracepoint
!= 1)
2659 /* No longer need this breakpoint. */
2660 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2663 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2664 "stopping all threads momentarily.\n");
2666 /* Other running threads could hit this breakpoint.
2667 We don't handle moribund locations like GDB does,
2668 instead we always pause all threads when removing
2669 breakpoints, so that any step-over or
2670 decr_pc_after_break adjustment is always taken
2671 care of while the breakpoint is still
2673 stop_all_lwps (1, event_child
);
2675 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2676 event_child
->exit_jump_pad_bkpt
= NULL
;
2678 unstop_all_lwps (1, event_child
);
2680 gdb_assert (event_child
->suspended
>= 0);
2684 if (event_child
->collecting_fast_tracepoint
== 0)
2687 debug_printf ("fast tracepoint finished "
2688 "collecting successfully.\n");
2690 /* We may have a deferred signal to report. */
2691 if (dequeue_one_deferred_signal (event_child
, &w
))
2694 debug_printf ("dequeued one signal.\n");
2699 debug_printf ("no deferred signals.\n");
2701 if (stabilizing_threads
)
2703 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2704 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2708 debug_printf ("linux_wait_1 ret = %s, stopped "
2709 "while stabilizing threads\n",
2710 target_pid_to_str (ptid_of (current_thread
)));
2714 return ptid_of (current_thread
);
2720 /* Check whether GDB would be interested in this event. */
2722 /* If GDB is not interested in this signal, don't stop other
2723 threads, and don't report it to GDB. Just resume the inferior
2724 right away. We do this for threading-related signals as well as
2725 any that GDB specifically requested we ignore. But never ignore
2726 SIGSTOP if we sent it ourselves, and do not ignore signals when
2727 stepping - they may require special handling to skip the signal
2728 handler. Also never ignore signals that could be caused by a
2730 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2733 && current_thread
->last_resume_kind
!= resume_step
2735 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2736 (current_process ()->private->thread_db
!= NULL
2737 && (WSTOPSIG (w
) == __SIGRTMIN
2738 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2741 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2742 && !(WSTOPSIG (w
) == SIGSTOP
2743 && current_thread
->last_resume_kind
== resume_stop
)
2744 && !linux_wstatus_maybe_breakpoint (w
))))
2746 siginfo_t info
, *info_p
;
2749 debug_printf ("Ignored signal %d for LWP %ld.\n",
2750 WSTOPSIG (w
), lwpid_of (current_thread
));
2752 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2753 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2757 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2758 WSTOPSIG (w
), info_p
);
2759 return ignore_event (ourstatus
);
2762 /* Note that all addresses are always "out of the step range" when
2763 there's no range to begin with. */
2764 in_step_range
= lwp_in_step_range (event_child
);
2766 /* If GDB wanted this thread to single step, and the thread is out
2767 of the step range, we always want to report the SIGTRAP, and let
2768 GDB handle it. Watchpoints should always be reported. So should
2769 signals we can't explain. A SIGTRAP we can't explain could be a
2770 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2771 do, we're be able to handle GDB breakpoints on top of internal
2772 breakpoints, by handling the internal breakpoint and still
2773 reporting the event to GDB. If we don't, we're out of luck, GDB
2774 won't see the breakpoint hit. */
2775 report_to_gdb
= (!maybe_internal_trap
2776 || (current_thread
->last_resume_kind
== resume_step
2778 || event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
2779 || (!step_over_finished
&& !in_step_range
2780 && !bp_explains_trap
&& !trace_event
)
2781 || (gdb_breakpoint_here (event_child
->stop_pc
)
2782 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2783 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2785 run_breakpoint_commands (event_child
->stop_pc
);
2787 /* We found no reason GDB would want us to stop. We either hit one
2788 of our own breakpoints, or finished an internal step GDB
2789 shouldn't know about. */
2794 if (bp_explains_trap
)
2795 debug_printf ("Hit a gdbserver breakpoint.\n");
2796 if (step_over_finished
)
2797 debug_printf ("Step-over finished.\n");
2799 debug_printf ("Tracepoint event.\n");
2800 if (lwp_in_step_range (event_child
))
2801 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2802 paddress (event_child
->stop_pc
),
2803 paddress (event_child
->step_range_start
),
2804 paddress (event_child
->step_range_end
));
2807 /* We're not reporting this breakpoint to GDB, so apply the
2808 decr_pc_after_break adjustment to the inferior's regcache
2811 if (the_low_target
.set_pc
!= NULL
)
2813 struct regcache
*regcache
2814 = get_thread_regcache (current_thread
, 1);
2815 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2818 /* We may have finished stepping over a breakpoint. If so,
2819 we've stopped and suspended all LWPs momentarily except the
2820 stepping one. This is where we resume them all again. We're
2821 going to keep waiting, so use proceed, which handles stepping
2822 over the next breakpoint. */
2824 debug_printf ("proceeding all threads.\n");
2826 if (step_over_finished
)
2827 unsuspend_all_lwps (event_child
);
2829 proceed_all_lwps ();
2830 return ignore_event (ourstatus
);
2835 if (current_thread
->last_resume_kind
== resume_step
)
2837 if (event_child
->step_range_start
== event_child
->step_range_end
)
2838 debug_printf ("GDB wanted to single-step, reporting event.\n");
2839 else if (!lwp_in_step_range (event_child
))
2840 debug_printf ("Out of step range, reporting event.\n");
2842 if (event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
)
2843 debug_printf ("Stopped by watchpoint.\n");
2844 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2845 debug_printf ("Stopped by GDB breakpoint.\n");
2847 debug_printf ("Hit a non-gdbserver trap event.\n");
2850 /* Alright, we're going to report a stop. */
2852 if (!stabilizing_threads
)
2854 /* In all-stop, stop all threads. */
2856 stop_all_lwps (0, NULL
);
2858 /* If we're not waiting for a specific LWP, choose an event LWP
2859 from among those that have had events. Giving equal priority
2860 to all LWPs that have had events helps prevent
2862 if (ptid_equal (ptid
, minus_one_ptid
))
2864 event_child
->status_pending_p
= 1;
2865 event_child
->status_pending
= w
;
2867 select_event_lwp (&event_child
);
2869 /* current_thread and event_child must stay in sync. */
2870 current_thread
= get_lwp_thread (event_child
);
2872 event_child
->status_pending_p
= 0;
2873 w
= event_child
->status_pending
;
2876 if (step_over_finished
)
2880 /* If we were doing a step-over, all other threads but
2881 the stepping one had been paused in start_step_over,
2882 with their suspend counts incremented. We don't want
2883 to do a full unstop/unpause, because we're in
2884 all-stop mode (so we want threads stopped), but we
2885 still need to unsuspend the other threads, to
2886 decrement their `suspended' count back. */
2887 unsuspend_all_lwps (event_child
);
2891 /* If we just finished a step-over, then all threads had
2892 been momentarily paused. In all-stop, that's fine,
2893 we want threads stopped by now anyway. In non-stop,
2894 we need to re-resume threads that GDB wanted to be
2896 unstop_all_lwps (1, event_child
);
2900 /* Stabilize threads (move out of jump pads). */
2902 stabilize_threads ();
2906 /* If we just finished a step-over, then all threads had been
2907 momentarily paused. In all-stop, that's fine, we want
2908 threads stopped by now anyway. In non-stop, we need to
2909 re-resume threads that GDB wanted to be running. */
2910 if (step_over_finished
)
2911 unstop_all_lwps (1, event_child
);
2914 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2916 /* Now that we've selected our final event LWP, un-adjust its PC if
2917 it was a software breakpoint. */
2918 if (event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2920 int decr_pc
= the_low_target
.decr_pc_after_break
;
2924 struct regcache
*regcache
2925 = get_thread_regcache (current_thread
, 1);
2926 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
2930 if (current_thread
->last_resume_kind
== resume_stop
2931 && WSTOPSIG (w
) == SIGSTOP
)
2933 /* A thread that has been requested to stop by GDB with vCont;t,
2934 and it stopped cleanly, so report as SIG0. The use of
2935 SIGSTOP is an implementation detail. */
2936 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2938 else if (current_thread
->last_resume_kind
== resume_stop
2939 && WSTOPSIG (w
) != SIGSTOP
)
2941 /* A thread that has been requested to stop by GDB with vCont;t,
2942 but, it stopped for other reasons. */
2943 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2947 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2950 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2954 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2955 target_pid_to_str (ptid_of (current_thread
)),
2956 ourstatus
->kind
, ourstatus
->value
.sig
);
2960 return ptid_of (current_thread
);
2963 /* Get rid of any pending event in the pipe. */
2965 async_file_flush (void)
2971 ret
= read (linux_event_pipe
[0], &buf
, 1);
2972 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2975 /* Put something in the pipe, so the event loop wakes up. */
2977 async_file_mark (void)
2981 async_file_flush ();
2984 ret
= write (linux_event_pipe
[1], "+", 1);
2985 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2987 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2988 be awakened anyway. */
2992 linux_wait (ptid_t ptid
,
2993 struct target_waitstatus
*ourstatus
, int target_options
)
2997 /* Flush the async file first. */
2998 if (target_is_async_p ())
2999 async_file_flush ();
3003 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3005 while ((target_options
& TARGET_WNOHANG
) == 0
3006 && ptid_equal (event_ptid
, null_ptid
)
3007 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3009 /* If at least one stop was reported, there may be more. A single
3010 SIGCHLD can signal more than one child stop. */
3011 if (target_is_async_p ()
3012 && (target_options
& TARGET_WNOHANG
) != 0
3013 && !ptid_equal (event_ptid
, null_ptid
))
3019 /* Send a signal to an LWP. */
3022 kill_lwp (unsigned long lwpid
, int signo
)
3024 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3025 fails, then we are not using nptl threads and we should be using kill. */
3029 static int tkill_failed
;
3036 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3037 if (errno
!= ENOSYS
)
3044 return kill (lwpid
, signo
);
3048 linux_stop_lwp (struct lwp_info
*lwp
)
3054 send_sigstop (struct lwp_info
*lwp
)
3058 pid
= lwpid_of (get_lwp_thread (lwp
));
3060 /* If we already have a pending stop signal for this process, don't
3062 if (lwp
->stop_expected
)
3065 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3071 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3073 lwp
->stop_expected
= 1;
3074 kill_lwp (pid
, SIGSTOP
);
3078 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3080 struct thread_info
*thread
= (struct thread_info
*) entry
;
3081 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3083 /* Ignore EXCEPT. */
3094 /* Increment the suspend count of an LWP, and stop it, if not stopped
3097 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3100 struct thread_info
*thread
= (struct thread_info
*) entry
;
3101 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3103 /* Ignore EXCEPT. */
3109 return send_sigstop_callback (entry
, except
);
3113 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3115 /* It's dead, really. */
3118 /* Store the exit status for later. */
3119 lwp
->status_pending_p
= 1;
3120 lwp
->status_pending
= wstat
;
3122 /* Prevent trying to stop it. */
3125 /* No further stops are expected from a dead lwp. */
3126 lwp
->stop_expected
= 0;
3129 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3132 wait_for_sigstop (void)
3134 struct thread_info
*saved_thread
;
3139 saved_thread
= current_thread
;
3140 if (saved_thread
!= NULL
)
3141 saved_tid
= saved_thread
->entry
.id
;
3143 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3146 debug_printf ("wait_for_sigstop: pulling events\n");
3148 /* Passing NULL_PTID as filter indicates we want all events to be
3149 left pending. Eventually this returns when there are no
3150 unwaited-for children left. */
3151 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3153 gdb_assert (ret
== -1);
3155 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3156 current_thread
= saved_thread
;
3160 debug_printf ("Previously current thread died.\n");
3164 /* We can't change the current inferior behind GDB's back,
3165 otherwise, a subsequent command may apply to the wrong
3167 current_thread
= NULL
;
3171 /* Set a valid thread as current. */
3172 set_desired_thread (0);
3177 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3178 move it out, because we need to report the stop event to GDB. For
3179 example, if the user puts a breakpoint in the jump pad, it's
3180 because she wants to debug it. */
3183 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3185 struct thread_info
*thread
= (struct thread_info
*) entry
;
3186 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3188 gdb_assert (lwp
->suspended
== 0);
3189 gdb_assert (lwp
->stopped
);
3191 /* Allow debugging the jump pad, gdb_collect, etc.. */
3192 return (supports_fast_tracepoints ()
3193 && agent_loaded_p ()
3194 && (gdb_breakpoint_here (lwp
->stop_pc
)
3195 || lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
3196 || thread
->last_resume_kind
== resume_step
)
3197 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3201 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3203 struct thread_info
*thread
= (struct thread_info
*) entry
;
3204 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3207 gdb_assert (lwp
->suspended
== 0);
3208 gdb_assert (lwp
->stopped
);
3210 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3212 /* Allow debugging the jump pad, gdb_collect, etc. */
3213 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3214 && lwp
->stop_reason
!= LWP_STOPPED_BY_WATCHPOINT
3215 && thread
->last_resume_kind
!= resume_step
3216 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3219 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3224 lwp
->status_pending_p
= 0;
3225 enqueue_one_deferred_signal (lwp
, wstat
);
3228 debug_printf ("Signal %d for LWP %ld deferred "
3230 WSTOPSIG (*wstat
), lwpid_of (thread
));
3233 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3240 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3242 struct thread_info
*thread
= (struct thread_info
*) entry
;
3243 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3252 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3253 If SUSPEND, then also increase the suspend count of every LWP,
3257 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3259 /* Should not be called recursively. */
3260 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3265 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3266 suspend
? "stop-and-suspend" : "stop",
3268 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3272 stopping_threads
= (suspend
3273 ? STOPPING_AND_SUSPENDING_THREADS
3274 : STOPPING_THREADS
);
3277 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3279 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3280 wait_for_sigstop ();
3281 stopping_threads
= NOT_STOPPING_THREADS
;
3285 debug_printf ("stop_all_lwps done, setting stopping_threads "
3286 "back to !stopping\n");
3291 /* Resume execution of the inferior process.
3292 If STEP is nonzero, single-step it.
3293 If SIGNAL is nonzero, give it that signal. */
3296 linux_resume_one_lwp (struct lwp_info
*lwp
,
3297 int step
, int signal
, siginfo_t
*info
)
3299 struct thread_info
*thread
= get_lwp_thread (lwp
);
3300 struct thread_info
*saved_thread
;
3301 int fast_tp_collecting
;
3303 if (lwp
->stopped
== 0)
3306 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3308 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3310 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3311 user used the "jump" command, or "set $pc = foo"). */
3312 if (lwp
->stop_pc
!= get_pc (lwp
))
3314 /* Collecting 'while-stepping' actions doesn't make sense
3316 release_while_stepping_state_list (thread
);
3319 /* If we have pending signals or status, and a new signal, enqueue the
3320 signal. Also enqueue the signal if we are waiting to reinsert a
3321 breakpoint; it will be picked up again below. */
3323 && (lwp
->status_pending_p
3324 || lwp
->pending_signals
!= NULL
3325 || lwp
->bp_reinsert
!= 0
3326 || fast_tp_collecting
))
3328 struct pending_signals
*p_sig
;
3329 p_sig
= xmalloc (sizeof (*p_sig
));
3330 p_sig
->prev
= lwp
->pending_signals
;
3331 p_sig
->signal
= signal
;
3333 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3335 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3336 lwp
->pending_signals
= p_sig
;
3339 if (lwp
->status_pending_p
)
3342 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3343 " has pending status\n",
3344 lwpid_of (thread
), step
? "step" : "continue", signal
,
3345 lwp
->stop_expected
? "expected" : "not expected");
3349 saved_thread
= current_thread
;
3350 current_thread
= thread
;
3353 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3354 lwpid_of (thread
), step
? "step" : "continue", signal
,
3355 lwp
->stop_expected
? "expected" : "not expected");
3357 /* This bit needs some thinking about. If we get a signal that
3358 we must report while a single-step reinsert is still pending,
3359 we often end up resuming the thread. It might be better to
3360 (ew) allow a stack of pending events; then we could be sure that
3361 the reinsert happened right away and not lose any signals.
3363 Making this stack would also shrink the window in which breakpoints are
3364 uninserted (see comment in linux_wait_for_lwp) but not enough for
3365 complete correctness, so it won't solve that problem. It may be
3366 worthwhile just to solve this one, however. */
3367 if (lwp
->bp_reinsert
!= 0)
3370 debug_printf (" pending reinsert at 0x%s\n",
3371 paddress (lwp
->bp_reinsert
));
3373 if (can_hardware_single_step ())
3375 if (fast_tp_collecting
== 0)
3378 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3380 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3387 /* Postpone any pending signal. It was enqueued above. */
3391 if (fast_tp_collecting
== 1)
3394 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3395 " (exit-jump-pad-bkpt)\n",
3398 /* Postpone any pending signal. It was enqueued above. */
3401 else if (fast_tp_collecting
== 2)
3404 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3405 " single-stepping\n",
3408 if (can_hardware_single_step ())
3412 internal_error (__FILE__
, __LINE__
,
3413 "moving out of jump pad single-stepping"
3414 " not implemented on this target");
3417 /* Postpone any pending signal. It was enqueued above. */
3421 /* If we have while-stepping actions in this thread set it stepping.
3422 If we have a signal to deliver, it may or may not be set to
3423 SIG_IGN, we don't know. Assume so, and allow collecting
3424 while-stepping into a signal handler. A possible smart thing to
3425 do would be to set an internal breakpoint at the signal return
3426 address, continue, and carry on catching this while-stepping
3427 action only when that breakpoint is hit. A future
3429 if (thread
->while_stepping
!= NULL
3430 && can_hardware_single_step ())
3433 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3438 if (the_low_target
.get_pc
!= NULL
)
3440 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3442 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3446 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3447 (long) lwp
->stop_pc
);
3451 /* If we have pending signals, consume one unless we are trying to
3452 reinsert a breakpoint or we're trying to finish a fast tracepoint
3454 if (lwp
->pending_signals
!= NULL
3455 && lwp
->bp_reinsert
== 0
3456 && fast_tp_collecting
== 0)
3458 struct pending_signals
**p_sig
;
3460 p_sig
= &lwp
->pending_signals
;
3461 while ((*p_sig
)->prev
!= NULL
)
3462 p_sig
= &(*p_sig
)->prev
;
3464 signal
= (*p_sig
)->signal
;
3465 if ((*p_sig
)->info
.si_signo
!= 0)
3466 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3473 if (the_low_target
.prepare_to_resume
!= NULL
)
3474 the_low_target
.prepare_to_resume (lwp
);
3476 regcache_invalidate_thread (thread
);
3479 lwp
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
3480 lwp
->stepping
= step
;
3481 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3482 (PTRACE_TYPE_ARG3
) 0,
3483 /* Coerce to a uintptr_t first to avoid potential gcc warning
3484 of coercing an 8 byte integer to a 4 byte pointer. */
3485 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3487 current_thread
= saved_thread
;
3490 /* ESRCH from ptrace either means that the thread was already
3491 running (an error) or that it is gone (a race condition). If
3492 it's gone, we will get a notification the next time we wait,
3493 so we can ignore the error. We could differentiate these
3494 two, but it's tricky without waiting; the thread still exists
3495 as a zombie, so sending it signal 0 would succeed. So just
3500 perror_with_name ("ptrace");
3504 struct thread_resume_array
3506 struct thread_resume
*resume
;
3510 /* This function is called once per thread via find_inferior.
3511 ARG is a pointer to a thread_resume_array struct.
3512 We look up the thread specified by ENTRY in ARG, and mark the thread
3513 with a pointer to the appropriate resume request.
3515 This algorithm is O(threads * resume elements), but resume elements
3516 is small (and will remain small at least until GDB supports thread
3520 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3522 struct thread_info
*thread
= (struct thread_info
*) entry
;
3523 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3525 struct thread_resume_array
*r
;
3529 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3531 ptid_t ptid
= r
->resume
[ndx
].thread
;
3532 if (ptid_equal (ptid
, minus_one_ptid
)
3533 || ptid_equal (ptid
, entry
->id
)
3534 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3536 || (ptid_get_pid (ptid
) == pid_of (thread
)
3537 && (ptid_is_pid (ptid
)
3538 || ptid_get_lwp (ptid
) == -1)))
3540 if (r
->resume
[ndx
].kind
== resume_stop
3541 && thread
->last_resume_kind
== resume_stop
)
3544 debug_printf ("already %s LWP %ld at GDB's request\n",
3545 (thread
->last_status
.kind
3546 == TARGET_WAITKIND_STOPPED
)
3554 lwp
->resume
= &r
->resume
[ndx
];
3555 thread
->last_resume_kind
= lwp
->resume
->kind
;
3557 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3558 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3560 /* If we had a deferred signal to report, dequeue one now.
3561 This can happen if LWP gets more than one signal while
3562 trying to get out of a jump pad. */
3564 && !lwp
->status_pending_p
3565 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3567 lwp
->status_pending_p
= 1;
3570 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3571 "leaving status pending.\n",
3572 WSTOPSIG (lwp
->status_pending
),
3580 /* No resume action for this thread. */
3586 /* find_inferior callback for linux_resume.
3587 Set *FLAG_P if this lwp has an interesting status pending. */
3590 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3592 struct thread_info
*thread
= (struct thread_info
*) entry
;
3593 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3595 /* LWPs which will not be resumed are not interesting, because
3596 we might not wait for them next time through linux_wait. */
3597 if (lwp
->resume
== NULL
)
3600 if (thread_still_has_status_pending_p (thread
))
3601 * (int *) flag_p
= 1;
3606 /* Return 1 if this lwp that GDB wants running is stopped at an
3607 internal breakpoint that we need to step over. It assumes that any
3608 required STOP_PC adjustment has already been propagated to the
3609 inferior's regcache. */
3612 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3614 struct thread_info
*thread
= (struct thread_info
*) entry
;
3615 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3616 struct thread_info
*saved_thread
;
3619 /* LWPs which will not be resumed are not interesting, because we
3620 might not wait for them next time through linux_wait. */
3625 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3630 if (thread
->last_resume_kind
== resume_stop
)
3633 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3639 gdb_assert (lwp
->suspended
>= 0);
3644 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3649 if (!lwp
->need_step_over
)
3652 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3655 if (lwp
->status_pending_p
)
3658 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3664 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3668 /* If the PC has changed since we stopped, then don't do anything,
3669 and let the breakpoint/tracepoint be hit. This happens if, for
3670 instance, GDB handled the decr_pc_after_break subtraction itself,
3671 GDB is OOL stepping this thread, or the user has issued a "jump"
3672 command, or poked thread's registers herself. */
3673 if (pc
!= lwp
->stop_pc
)
3676 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3677 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3679 paddress (lwp
->stop_pc
), paddress (pc
));
3681 lwp
->need_step_over
= 0;
3685 saved_thread
= current_thread
;
3686 current_thread
= thread
;
3688 /* We can only step over breakpoints we know about. */
3689 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3691 /* Don't step over a breakpoint that GDB expects to hit
3692 though. If the condition is being evaluated on the target's side
3693 and it evaluate to false, step over this breakpoint as well. */
3694 if (gdb_breakpoint_here (pc
)
3695 && gdb_condition_true_at_breakpoint (pc
)
3696 && gdb_no_commands_at_breakpoint (pc
))
3699 debug_printf ("Need step over [LWP %ld]? yes, but found"
3700 " GDB breakpoint at 0x%s; skipping step over\n",
3701 lwpid_of (thread
), paddress (pc
));
3703 current_thread
= saved_thread
;
3709 debug_printf ("Need step over [LWP %ld]? yes, "
3710 "found breakpoint at 0x%s\n",
3711 lwpid_of (thread
), paddress (pc
));
3713 /* We've found an lwp that needs stepping over --- return 1 so
3714 that find_inferior stops looking. */
3715 current_thread
= saved_thread
;
3717 /* If the step over is cancelled, this is set again. */
3718 lwp
->need_step_over
= 0;
3723 current_thread
= saved_thread
;
3726 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3728 lwpid_of (thread
), paddress (pc
));
3733 /* Start a step-over operation on LWP. When LWP stopped at a
3734 breakpoint, to make progress, we need to remove the breakpoint out
3735 of the way. If we let other threads run while we do that, they may
3736 pass by the breakpoint location and miss hitting it. To avoid
3737 that, a step-over momentarily stops all threads while LWP is
3738 single-stepped while the breakpoint is temporarily uninserted from
3739 the inferior. When the single-step finishes, we reinsert the
3740 breakpoint, and let all threads that are supposed to be running,
3743 On targets that don't support hardware single-step, we don't
3744 currently support full software single-stepping. Instead, we only
3745 support stepping over the thread event breakpoint, by asking the
3746 low target where to place a reinsert breakpoint. Since this
3747 routine assumes the breakpoint being stepped over is a thread event
3748 breakpoint, it usually assumes the return address of the current
3749 function is a good enough place to set the reinsert breakpoint. */
3752 start_step_over (struct lwp_info
*lwp
)
3754 struct thread_info
*thread
= get_lwp_thread (lwp
);
3755 struct thread_info
*saved_thread
;
3760 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3763 stop_all_lwps (1, lwp
);
3764 gdb_assert (lwp
->suspended
== 0);
3767 debug_printf ("Done stopping all threads for step-over.\n");
3769 /* Note, we should always reach here with an already adjusted PC,
3770 either by GDB (if we're resuming due to GDB's request), or by our
3771 caller, if we just finished handling an internal breakpoint GDB
3772 shouldn't care about. */
3775 saved_thread
= current_thread
;
3776 current_thread
= thread
;
3778 lwp
->bp_reinsert
= pc
;
3779 uninsert_breakpoints_at (pc
);
3780 uninsert_fast_tracepoint_jumps_at (pc
);
3782 if (can_hardware_single_step ())
3788 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3789 set_reinsert_breakpoint (raddr
);
3793 current_thread
= saved_thread
;
3795 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3797 /* Require next event from this LWP. */
3798 step_over_bkpt
= thread
->entry
.id
;
3802 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3803 start_step_over, if still there, and delete any reinsert
3804 breakpoints we've set, on non hardware single-step targets. */
3807 finish_step_over (struct lwp_info
*lwp
)
3809 if (lwp
->bp_reinsert
!= 0)
3812 debug_printf ("Finished step over.\n");
3814 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3815 may be no breakpoint to reinsert there by now. */
3816 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3817 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3819 lwp
->bp_reinsert
= 0;
3821 /* Delete any software-single-step reinsert breakpoints. No
3822 longer needed. We don't have to worry about other threads
3823 hitting this trap, and later not being able to explain it,
3824 because we were stepping over a breakpoint, and we hold all
3825 threads but LWP stopped while doing that. */
3826 if (!can_hardware_single_step ())
3827 delete_reinsert_breakpoints ();
3829 step_over_bkpt
= null_ptid
;
3836 /* This function is called once per thread. We check the thread's resume
3837 request, which will tell us whether to resume, step, or leave the thread
3838 stopped; and what signal, if any, it should be sent.
3840 For threads which we aren't explicitly told otherwise, we preserve
3841 the stepping flag; this is used for stepping over gdbserver-placed
3844 If pending_flags was set in any thread, we queue any needed
3845 signals, since we won't actually resume. We already have a pending
3846 event to report, so we don't need to preserve any step requests;
3847 they should be re-issued if necessary. */
3850 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3852 struct thread_info
*thread
= (struct thread_info
*) entry
;
3853 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3855 int leave_all_stopped
= * (int *) arg
;
3858 if (lwp
->resume
== NULL
)
3861 if (lwp
->resume
->kind
== resume_stop
)
3864 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3869 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3871 /* Stop the thread, and wait for the event asynchronously,
3872 through the event loop. */
3878 debug_printf ("already stopped LWP %ld\n",
3881 /* The LWP may have been stopped in an internal event that
3882 was not meant to be notified back to GDB (e.g., gdbserver
3883 breakpoint), so we should be reporting a stop event in
3886 /* If the thread already has a pending SIGSTOP, this is a
3887 no-op. Otherwise, something later will presumably resume
3888 the thread and this will cause it to cancel any pending
3889 operation, due to last_resume_kind == resume_stop. If
3890 the thread already has a pending status to report, we
3891 will still report it the next time we wait - see
3892 status_pending_p_callback. */
3894 /* If we already have a pending signal to report, then
3895 there's no need to queue a SIGSTOP, as this means we're
3896 midway through moving the LWP out of the jumppad, and we
3897 will report the pending signal as soon as that is
3899 if (lwp
->pending_signals_to_report
== NULL
)
3903 /* For stop requests, we're done. */
3905 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3909 /* If this thread which is about to be resumed has a pending status,
3910 then don't resume any threads - we can just report the pending
3911 status. Make sure to queue any signals that would otherwise be
3912 sent. In all-stop mode, we do this decision based on if *any*
3913 thread has a pending status. If there's a thread that needs the
3914 step-over-breakpoint dance, then don't resume any other thread
3915 but that particular one. */
3916 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3921 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3923 step
= (lwp
->resume
->kind
== resume_step
);
3924 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3929 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3931 /* If we have a new signal, enqueue the signal. */
3932 if (lwp
->resume
->sig
!= 0)
3934 struct pending_signals
*p_sig
;
3935 p_sig
= xmalloc (sizeof (*p_sig
));
3936 p_sig
->prev
= lwp
->pending_signals
;
3937 p_sig
->signal
= lwp
->resume
->sig
;
3938 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3940 /* If this is the same signal we were previously stopped by,
3941 make sure to queue its siginfo. We can ignore the return
3942 value of ptrace; if it fails, we'll skip
3943 PTRACE_SETSIGINFO. */
3944 if (WIFSTOPPED (lwp
->last_status
)
3945 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3946 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3949 lwp
->pending_signals
= p_sig
;
3953 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3959 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3961 struct thread_resume_array array
= { resume_info
, n
};
3962 struct thread_info
*need_step_over
= NULL
;
3964 int leave_all_stopped
;
3969 debug_printf ("linux_resume:\n");
3972 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3974 /* If there is a thread which would otherwise be resumed, which has
3975 a pending status, then don't resume any threads - we can just
3976 report the pending status. Make sure to queue any signals that
3977 would otherwise be sent. In non-stop mode, we'll apply this
3978 logic to each thread individually. We consume all pending events
3979 before considering to start a step-over (in all-stop). */
3982 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3984 /* If there is a thread which would otherwise be resumed, which is
3985 stopped at a breakpoint that needs stepping over, then don't
3986 resume any threads - have it step over the breakpoint with all
3987 other threads stopped, then resume all threads again. Make sure
3988 to queue any signals that would otherwise be delivered or
3990 if (!any_pending
&& supports_breakpoints ())
3992 = (struct thread_info
*) find_inferior (&all_threads
,
3993 need_step_over_p
, NULL
);
3995 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3999 if (need_step_over
!= NULL
)
4000 debug_printf ("Not resuming all, need step over\n");
4001 else if (any_pending
)
4002 debug_printf ("Not resuming, all-stop and found "
4003 "an LWP with pending status\n");
4005 debug_printf ("Resuming, no pending status or step over needed\n");
4008 /* Even if we're leaving threads stopped, queue all signals we'd
4009 otherwise deliver. */
4010 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4013 start_step_over (get_thread_lwp (need_step_over
));
4017 debug_printf ("linux_resume done\n");
4022 /* This function is called once per thread. We check the thread's
4023 last resume request, which will tell us whether to resume, step, or
4024 leave the thread stopped. Any signal the client requested to be
4025 delivered has already been enqueued at this point.
4027 If any thread that GDB wants running is stopped at an internal
4028 breakpoint that needs stepping over, we start a step-over operation
4029 on that particular thread, and leave all others stopped. */
4032 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4034 struct thread_info
*thread
= (struct thread_info
*) entry
;
4035 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4042 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4047 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4051 if (thread
->last_resume_kind
== resume_stop
4052 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4055 debug_printf (" client wants LWP to remain %ld stopped\n",
4060 if (lwp
->status_pending_p
)
4063 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4068 gdb_assert (lwp
->suspended
>= 0);
4073 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4077 if (thread
->last_resume_kind
== resume_stop
4078 && lwp
->pending_signals_to_report
== NULL
4079 && lwp
->collecting_fast_tracepoint
== 0)
4081 /* We haven't reported this LWP as stopped yet (otherwise, the
4082 last_status.kind check above would catch it, and we wouldn't
4083 reach here. This LWP may have been momentarily paused by a
4084 stop_all_lwps call while handling for example, another LWP's
4085 step-over. In that case, the pending expected SIGSTOP signal
4086 that was queued at vCont;t handling time will have already
4087 been consumed by wait_for_sigstop, and so we need to requeue
4088 another one here. Note that if the LWP already has a SIGSTOP
4089 pending, this is a no-op. */
4092 debug_printf ("Client wants LWP %ld to stop. "
4093 "Making sure it has a SIGSTOP pending\n",
4099 step
= thread
->last_resume_kind
== resume_step
;
4100 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4105 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4107 struct thread_info
*thread
= (struct thread_info
*) entry
;
4108 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4114 gdb_assert (lwp
->suspended
>= 0);
4116 return proceed_one_lwp (entry
, except
);
4119 /* When we finish a step-over, set threads running again. If there's
4120 another thread that may need a step-over, now's the time to start
4121 it. Eventually, we'll move all threads past their breakpoints. */
4124 proceed_all_lwps (void)
4126 struct thread_info
*need_step_over
;
4128 /* If there is a thread which would otherwise be resumed, which is
4129 stopped at a breakpoint that needs stepping over, then don't
4130 resume any threads - have it step over the breakpoint with all
4131 other threads stopped, then resume all threads again. */
4133 if (supports_breakpoints ())
4136 = (struct thread_info
*) find_inferior (&all_threads
,
4137 need_step_over_p
, NULL
);
4139 if (need_step_over
!= NULL
)
4142 debug_printf ("proceed_all_lwps: found "
4143 "thread %ld needing a step-over\n",
4144 lwpid_of (need_step_over
));
4146 start_step_over (get_thread_lwp (need_step_over
));
4152 debug_printf ("Proceeding, no step-over needed\n");
4154 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4157 /* Stopped LWPs that the client wanted to be running, that don't have
4158 pending statuses, are set to run again, except for EXCEPT, if not
4159 NULL. This undoes a stop_all_lwps call. */
4162 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4168 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4169 lwpid_of (get_lwp_thread (except
)));
4171 debug_printf ("unstopping all lwps\n");
4175 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4177 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4181 debug_printf ("unstop_all_lwps done\n");
4187 #ifdef HAVE_LINUX_REGSETS
4189 #define use_linux_regsets 1
4191 /* Returns true if REGSET has been disabled. */
4194 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4196 return (info
->disabled_regsets
!= NULL
4197 && info
->disabled_regsets
[regset
- info
->regsets
]);
4200 /* Disable REGSET. */
4203 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4207 dr_offset
= regset
- info
->regsets
;
4208 if (info
->disabled_regsets
== NULL
)
4209 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4210 info
->disabled_regsets
[dr_offset
] = 1;
4214 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4215 struct regcache
*regcache
)
4217 struct regset_info
*regset
;
4218 int saw_general_regs
= 0;
4222 pid
= lwpid_of (current_thread
);
4223 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4228 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4231 buf
= xmalloc (regset
->size
);
4233 nt_type
= regset
->nt_type
;
4237 iov
.iov_len
= regset
->size
;
4238 data
= (void *) &iov
;
4244 res
= ptrace (regset
->get_request
, pid
,
4245 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4247 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4253 /* If we get EIO on a regset, do not try it again for
4254 this process mode. */
4255 disable_regset (regsets_info
, regset
);
4257 else if (errno
== ENODATA
)
4259 /* ENODATA may be returned if the regset is currently
4260 not "active". This can happen in normal operation,
4261 so suppress the warning in this case. */
4266 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4273 if (regset
->type
== GENERAL_REGS
)
4274 saw_general_regs
= 1;
4275 regset
->store_function (regcache
, buf
);
4279 if (saw_general_regs
)
4286 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4287 struct regcache
*regcache
)
4289 struct regset_info
*regset
;
4290 int saw_general_regs
= 0;
4294 pid
= lwpid_of (current_thread
);
4295 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4300 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4301 || regset
->fill_function
== NULL
)
4304 buf
= xmalloc (regset
->size
);
4306 /* First fill the buffer with the current register set contents,
4307 in case there are any items in the kernel's regset that are
4308 not in gdbserver's regcache. */
4310 nt_type
= regset
->nt_type
;
4314 iov
.iov_len
= regset
->size
;
4315 data
= (void *) &iov
;
4321 res
= ptrace (regset
->get_request
, pid
,
4322 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4324 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4329 /* Then overlay our cached registers on that. */
4330 regset
->fill_function (regcache
, buf
);
4332 /* Only now do we write the register set. */
4334 res
= ptrace (regset
->set_request
, pid
,
4335 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4337 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4345 /* If we get EIO on a regset, do not try it again for
4346 this process mode. */
4347 disable_regset (regsets_info
, regset
);
4349 else if (errno
== ESRCH
)
4351 /* At this point, ESRCH should mean the process is
4352 already gone, in which case we simply ignore attempts
4353 to change its registers. See also the related
4354 comment in linux_resume_one_lwp. */
4360 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4363 else if (regset
->type
== GENERAL_REGS
)
4364 saw_general_regs
= 1;
4367 if (saw_general_regs
)
4373 #else /* !HAVE_LINUX_REGSETS */
4375 #define use_linux_regsets 0
4376 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4377 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4381 /* Return 1 if register REGNO is supported by one of the regset ptrace
4382 calls or 0 if it has to be transferred individually. */
4385 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4387 unsigned char mask
= 1 << (regno
% 8);
4388 size_t index
= regno
/ 8;
4390 return (use_linux_regsets
4391 && (regs_info
->regset_bitmap
== NULL
4392 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4395 #ifdef HAVE_LINUX_USRREGS
4398 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4402 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4403 error ("Invalid register number %d.", regnum
);
4405 addr
= usrregs
->regmap
[regnum
];
4410 /* Fetch one register. */
4412 fetch_register (const struct usrregs_info
*usrregs
,
4413 struct regcache
*regcache
, int regno
)
4420 if (regno
>= usrregs
->num_regs
)
4422 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4425 regaddr
= register_addr (usrregs
, regno
);
4429 size
= ((register_size (regcache
->tdesc
, regno
)
4430 + sizeof (PTRACE_XFER_TYPE
) - 1)
4431 & -sizeof (PTRACE_XFER_TYPE
));
4432 buf
= alloca (size
);
4434 pid
= lwpid_of (current_thread
);
4435 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4438 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4439 ptrace (PTRACE_PEEKUSER
, pid
,
4440 /* Coerce to a uintptr_t first to avoid potential gcc warning
4441 of coercing an 8 byte integer to a 4 byte pointer. */
4442 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4443 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4445 error ("reading register %d: %s", regno
, strerror (errno
));
4448 if (the_low_target
.supply_ptrace_register
)
4449 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4451 supply_register (regcache
, regno
, buf
);
4454 /* Store one register. */
4456 store_register (const struct usrregs_info
*usrregs
,
4457 struct regcache
*regcache
, int regno
)
4464 if (regno
>= usrregs
->num_regs
)
4466 if ((*the_low_target
.cannot_store_register
) (regno
))
4469 regaddr
= register_addr (usrregs
, regno
);
4473 size
= ((register_size (regcache
->tdesc
, regno
)
4474 + sizeof (PTRACE_XFER_TYPE
) - 1)
4475 & -sizeof (PTRACE_XFER_TYPE
));
4476 buf
= alloca (size
);
4477 memset (buf
, 0, size
);
4479 if (the_low_target
.collect_ptrace_register
)
4480 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4482 collect_register (regcache
, regno
, buf
);
4484 pid
= lwpid_of (current_thread
);
4485 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4488 ptrace (PTRACE_POKEUSER
, pid
,
4489 /* Coerce to a uintptr_t first to avoid potential gcc warning
4490 about coercing an 8 byte integer to a 4 byte pointer. */
4491 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4492 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4495 /* At this point, ESRCH should mean the process is
4496 already gone, in which case we simply ignore attempts
4497 to change its registers. See also the related
4498 comment in linux_resume_one_lwp. */
4502 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4503 error ("writing register %d: %s", regno
, strerror (errno
));
4505 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4509 /* Fetch all registers, or just one, from the child process.
4510 If REGNO is -1, do this for all registers, skipping any that are
4511 assumed to have been retrieved by regsets_fetch_inferior_registers,
4512 unless ALL is non-zero.
4513 Otherwise, REGNO specifies which register (so we can save time). */
4515 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4516 struct regcache
*regcache
, int regno
, int all
)
4518 struct usrregs_info
*usr
= regs_info
->usrregs
;
4522 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4523 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4524 fetch_register (usr
, regcache
, regno
);
4527 fetch_register (usr
, regcache
, regno
);
4530 /* Store our register values back into the inferior.
4531 If REGNO is -1, do this for all registers, skipping any that are
4532 assumed to have been saved by regsets_store_inferior_registers,
4533 unless ALL is non-zero.
4534 Otherwise, REGNO specifies which register (so we can save time). */
4536 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4537 struct regcache
*regcache
, int regno
, int all
)
4539 struct usrregs_info
*usr
= regs_info
->usrregs
;
4543 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4544 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4545 store_register (usr
, regcache
, regno
);
4548 store_register (usr
, regcache
, regno
);
4551 #else /* !HAVE_LINUX_USRREGS */
4553 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4554 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4560 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4564 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4568 if (the_low_target
.fetch_register
!= NULL
4569 && regs_info
->usrregs
!= NULL
)
4570 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4571 (*the_low_target
.fetch_register
) (regcache
, regno
);
4573 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4574 if (regs_info
->usrregs
!= NULL
)
4575 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4579 if (the_low_target
.fetch_register
!= NULL
4580 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4583 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4585 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4587 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4588 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4593 linux_store_registers (struct regcache
*regcache
, int regno
)
4597 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4601 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4603 if (regs_info
->usrregs
!= NULL
)
4604 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4608 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4610 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4612 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4613 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4618 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4619 to debugger memory starting at MYADDR. */
4622 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4624 int pid
= lwpid_of (current_thread
);
4625 register PTRACE_XFER_TYPE
*buffer
;
4626 register CORE_ADDR addr
;
4633 /* Try using /proc. Don't bother for one word. */
4634 if (len
>= 3 * sizeof (long))
4638 /* We could keep this file open and cache it - possibly one per
4639 thread. That requires some juggling, but is even faster. */
4640 sprintf (filename
, "/proc/%d/mem", pid
);
4641 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4645 /* If pread64 is available, use it. It's faster if the kernel
4646 supports it (only one syscall), and it's 64-bit safe even on
4647 32-bit platforms (for instance, SPARC debugging a SPARC64
4650 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4653 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4654 bytes
= read (fd
, myaddr
, len
);
4661 /* Some data was read, we'll try to get the rest with ptrace. */
4671 /* Round starting address down to longword boundary. */
4672 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4673 /* Round ending address up; get number of longwords that makes. */
4674 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4675 / sizeof (PTRACE_XFER_TYPE
));
4676 /* Allocate buffer of that many longwords. */
4677 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4679 /* Read all the longwords */
4681 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4683 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4684 about coercing an 8 byte integer to a 4 byte pointer. */
4685 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4686 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4687 (PTRACE_TYPE_ARG4
) 0);
4693 /* Copy appropriate bytes out of the buffer. */
4696 i
*= sizeof (PTRACE_XFER_TYPE
);
4697 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4699 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4706 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4707 memory at MEMADDR. On failure (cannot write to the inferior)
4708 returns the value of errno. Always succeeds if LEN is zero. */
4711 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4714 /* Round starting address down to longword boundary. */
4715 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4716 /* Round ending address up; get number of longwords that makes. */
4718 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4719 / sizeof (PTRACE_XFER_TYPE
);
4721 /* Allocate buffer of that many longwords. */
4722 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4723 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4725 int pid
= lwpid_of (current_thread
);
4729 /* Zero length write always succeeds. */
4735 /* Dump up to four bytes. */
4736 unsigned int val
= * (unsigned int *) myaddr
;
4742 val
= val
& 0xffffff;
4743 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4744 val
, (long)memaddr
);
4747 /* Fill start and end extra bytes of buffer with existing memory data. */
4750 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4751 about coercing an 8 byte integer to a 4 byte pointer. */
4752 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4753 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4754 (PTRACE_TYPE_ARG4
) 0);
4762 = ptrace (PTRACE_PEEKTEXT
, pid
,
4763 /* Coerce to a uintptr_t first to avoid potential gcc warning
4764 about coercing an 8 byte integer to a 4 byte pointer. */
4765 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4766 * sizeof (PTRACE_XFER_TYPE
)),
4767 (PTRACE_TYPE_ARG4
) 0);
4772 /* Copy data to be written over corresponding part of buffer. */
4774 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4777 /* Write the entire buffer. */
4779 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4782 ptrace (PTRACE_POKETEXT
, pid
,
4783 /* Coerce to a uintptr_t first to avoid potential gcc warning
4784 about coercing an 8 byte integer to a 4 byte pointer. */
4785 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4786 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4795 linux_look_up_symbols (void)
4797 #ifdef USE_THREAD_DB
4798 struct process_info
*proc
= current_process ();
4800 if (proc
->private->thread_db
!= NULL
)
4803 /* If the kernel supports tracing clones, then we don't need to
4804 use the magic thread event breakpoint to learn about
4806 thread_db_init (!linux_supports_traceclone ());
4811 linux_request_interrupt (void)
4813 extern unsigned long signal_pid
;
4815 /* Send a SIGINT to the process group. This acts just like the user
4816 typed a ^C on the controlling terminal. */
4817 kill (-signal_pid
, SIGINT
);
4820 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4821 to debugger memory starting at MYADDR. */
4824 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4826 char filename
[PATH_MAX
];
4828 int pid
= lwpid_of (current_thread
);
4830 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4832 fd
= open (filename
, O_RDONLY
);
4836 if (offset
!= (CORE_ADDR
) 0
4837 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4840 n
= read (fd
, myaddr
, len
);
4847 /* These breakpoint and watchpoint related wrapper functions simply
4848 pass on the function call if the target has registered a
4849 corresponding function. */
4852 linux_supports_z_point_type (char z_type
)
4854 return (the_low_target
.supports_z_point_type
!= NULL
4855 && the_low_target
.supports_z_point_type (z_type
));
4859 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4860 int size
, struct raw_breakpoint
*bp
)
4862 if (the_low_target
.insert_point
!= NULL
)
4863 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4865 /* Unsupported (see target.h). */
4870 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4871 int size
, struct raw_breakpoint
*bp
)
4873 if (the_low_target
.remove_point
!= NULL
)
4874 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4876 /* Unsupported (see target.h). */
4881 linux_stopped_by_watchpoint (void)
4883 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4885 return lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
4889 linux_stopped_data_address (void)
4891 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4893 return lwp
->stopped_data_address
;
4896 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4897 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4898 && defined(PT_TEXT_END_ADDR)
4900 /* This is only used for targets that define PT_TEXT_ADDR,
4901 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4902 the target has different ways of acquiring this information, like
4905 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4906 to tell gdb about. */
4909 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4911 unsigned long text
, text_end
, data
;
4912 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4916 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4917 (PTRACE_TYPE_ARG4
) 0);
4918 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4919 (PTRACE_TYPE_ARG4
) 0);
4920 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4921 (PTRACE_TYPE_ARG4
) 0);
4925 /* Both text and data offsets produced at compile-time (and so
4926 used by gdb) are relative to the beginning of the program,
4927 with the data segment immediately following the text segment.
4928 However, the actual runtime layout in memory may put the data
4929 somewhere else, so when we send gdb a data base-address, we
4930 use the real data base address and subtract the compile-time
4931 data base-address from it (which is just the length of the
4932 text segment). BSS immediately follows data in both
4935 *data_p
= data
- (text_end
- text
);
4944 linux_qxfer_osdata (const char *annex
,
4945 unsigned char *readbuf
, unsigned const char *writebuf
,
4946 CORE_ADDR offset
, int len
)
4948 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4951 /* Convert a native/host siginfo object, into/from the siginfo in the
4952 layout of the inferiors' architecture. */
4955 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4959 if (the_low_target
.siginfo_fixup
!= NULL
)
4960 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4962 /* If there was no callback, or the callback didn't do anything,
4963 then just do a straight memcpy. */
4967 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4969 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4974 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4975 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4979 char inf_siginfo
[sizeof (siginfo_t
)];
4981 if (current_thread
== NULL
)
4984 pid
= lwpid_of (current_thread
);
4987 debug_printf ("%s siginfo for lwp %d.\n",
4988 readbuf
!= NULL
? "Reading" : "Writing",
4991 if (offset
>= sizeof (siginfo
))
4994 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4997 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4998 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4999 inferior with a 64-bit GDBSERVER should look the same as debugging it
5000 with a 32-bit GDBSERVER, we need to convert it. */
5001 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5003 if (offset
+ len
> sizeof (siginfo
))
5004 len
= sizeof (siginfo
) - offset
;
5006 if (readbuf
!= NULL
)
5007 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5010 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5012 /* Convert back to ptrace layout before flushing it out. */
5013 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5015 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5022 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5023 so we notice when children change state; as the handler for the
5024 sigsuspend in my_waitpid. */
5027 sigchld_handler (int signo
)
5029 int old_errno
= errno
;
5035 /* fprintf is not async-signal-safe, so call write
5037 if (write (2, "sigchld_handler\n",
5038 sizeof ("sigchld_handler\n") - 1) < 0)
5039 break; /* just ignore */
5043 if (target_is_async_p ())
5044 async_file_mark (); /* trigger a linux_wait */
5050 linux_supports_non_stop (void)
5056 linux_async (int enable
)
5058 int previous
= target_is_async_p ();
5061 debug_printf ("linux_async (%d), previous=%d\n",
5064 if (previous
!= enable
)
5067 sigemptyset (&mask
);
5068 sigaddset (&mask
, SIGCHLD
);
5070 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5074 if (pipe (linux_event_pipe
) == -1)
5076 linux_event_pipe
[0] = -1;
5077 linux_event_pipe
[1] = -1;
5078 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5080 warning ("creating event pipe failed.");
5084 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5085 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5087 /* Register the event loop handler. */
5088 add_file_handler (linux_event_pipe
[0],
5089 handle_target_event
, NULL
);
5091 /* Always trigger a linux_wait. */
5096 delete_file_handler (linux_event_pipe
[0]);
5098 close (linux_event_pipe
[0]);
5099 close (linux_event_pipe
[1]);
5100 linux_event_pipe
[0] = -1;
5101 linux_event_pipe
[1] = -1;
5104 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5111 linux_start_non_stop (int nonstop
)
5113 /* Register or unregister from event-loop accordingly. */
5114 linux_async (nonstop
);
5116 if (target_is_async_p () != (nonstop
!= 0))
5123 linux_supports_multi_process (void)
5129 linux_supports_disable_randomization (void)
5131 #ifdef HAVE_PERSONALITY
5139 linux_supports_agent (void)
5145 linux_supports_range_stepping (void)
5147 if (*the_low_target
.supports_range_stepping
== NULL
)
5150 return (*the_low_target
.supports_range_stepping
) ();
5153 /* Enumerate spufs IDs for process PID. */
5155 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5161 struct dirent
*entry
;
5163 sprintf (path
, "/proc/%ld/fd", pid
);
5164 dir
= opendir (path
);
5169 while ((entry
= readdir (dir
)) != NULL
)
5175 fd
= atoi (entry
->d_name
);
5179 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5180 if (stat (path
, &st
) != 0)
5182 if (!S_ISDIR (st
.st_mode
))
5185 if (statfs (path
, &stfs
) != 0)
5187 if (stfs
.f_type
!= SPUFS_MAGIC
)
5190 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5192 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5202 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5203 object type, using the /proc file system. */
5205 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5206 unsigned const char *writebuf
,
5207 CORE_ADDR offset
, int len
)
5209 long pid
= lwpid_of (current_thread
);
5214 if (!writebuf
&& !readbuf
)
5222 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5225 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5226 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5231 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5238 ret
= write (fd
, writebuf
, (size_t) len
);
5240 ret
= read (fd
, readbuf
, (size_t) len
);
5246 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5247 struct target_loadseg
5249 /* Core address to which the segment is mapped. */
5251 /* VMA recorded in the program header. */
5253 /* Size of this segment in memory. */
5257 # if defined PT_GETDSBT
5258 struct target_loadmap
5260 /* Protocol version number, must be zero. */
5262 /* Pointer to the DSBT table, its size, and the DSBT index. */
5263 unsigned *dsbt_table
;
5264 unsigned dsbt_size
, dsbt_index
;
5265 /* Number of segments in this map. */
5267 /* The actual memory map. */
5268 struct target_loadseg segs
[/*nsegs*/];
5270 # define LINUX_LOADMAP PT_GETDSBT
5271 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5272 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5274 struct target_loadmap
5276 /* Protocol version number, must be zero. */
5278 /* Number of segments in this map. */
5280 /* The actual memory map. */
5281 struct target_loadseg segs
[/*nsegs*/];
5283 # define LINUX_LOADMAP PTRACE_GETFDPIC
5284 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5285 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5289 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5290 unsigned char *myaddr
, unsigned int len
)
5292 int pid
= lwpid_of (current_thread
);
5294 struct target_loadmap
*data
= NULL
;
5295 unsigned int actual_length
, copy_length
;
5297 if (strcmp (annex
, "exec") == 0)
5298 addr
= (int) LINUX_LOADMAP_EXEC
;
5299 else if (strcmp (annex
, "interp") == 0)
5300 addr
= (int) LINUX_LOADMAP_INTERP
;
5304 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5310 actual_length
= sizeof (struct target_loadmap
)
5311 + sizeof (struct target_loadseg
) * data
->nsegs
;
5313 if (offset
< 0 || offset
> actual_length
)
5316 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5317 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5321 # define linux_read_loadmap NULL
5322 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5325 linux_process_qsupported (const char *query
)
5327 if (the_low_target
.process_qsupported
!= NULL
)
5328 the_low_target
.process_qsupported (query
);
5332 linux_supports_tracepoints (void)
5334 if (*the_low_target
.supports_tracepoints
== NULL
)
5337 return (*the_low_target
.supports_tracepoints
) ();
5341 linux_read_pc (struct regcache
*regcache
)
5343 if (the_low_target
.get_pc
== NULL
)
5346 return (*the_low_target
.get_pc
) (regcache
);
5350 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5352 gdb_assert (the_low_target
.set_pc
!= NULL
);
5354 (*the_low_target
.set_pc
) (regcache
, pc
);
5358 linux_thread_stopped (struct thread_info
*thread
)
5360 return get_thread_lwp (thread
)->stopped
;
5363 /* This exposes stop-all-threads functionality to other modules. */
5366 linux_pause_all (int freeze
)
5368 stop_all_lwps (freeze
, NULL
);
5371 /* This exposes unstop-all-threads functionality to other gdbserver
5375 linux_unpause_all (int unfreeze
)
5377 unstop_all_lwps (unfreeze
, NULL
);
5381 linux_prepare_to_access_memory (void)
5383 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5386 linux_pause_all (1);
5391 linux_done_accessing_memory (void)
5393 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5396 linux_unpause_all (1);
5400 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5401 CORE_ADDR collector
,
5404 CORE_ADDR
*jump_entry
,
5405 CORE_ADDR
*trampoline
,
5406 ULONGEST
*trampoline_size
,
5407 unsigned char *jjump_pad_insn
,
5408 ULONGEST
*jjump_pad_insn_size
,
5409 CORE_ADDR
*adjusted_insn_addr
,
5410 CORE_ADDR
*adjusted_insn_addr_end
,
5413 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5414 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5415 jump_entry
, trampoline
, trampoline_size
,
5416 jjump_pad_insn
, jjump_pad_insn_size
,
5417 adjusted_insn_addr
, adjusted_insn_addr_end
,
5421 static struct emit_ops
*
5422 linux_emit_ops (void)
5424 if (the_low_target
.emit_ops
!= NULL
)
5425 return (*the_low_target
.emit_ops
) ();
5431 linux_get_min_fast_tracepoint_insn_len (void)
5433 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5436 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5439 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5440 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5442 char filename
[PATH_MAX
];
5444 const int auxv_size
= is_elf64
5445 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5446 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5448 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5450 fd
= open (filename
, O_RDONLY
);
5456 while (read (fd
, buf
, auxv_size
) == auxv_size
5457 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5461 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5463 switch (aux
->a_type
)
5466 *phdr_memaddr
= aux
->a_un
.a_val
;
5469 *num_phdr
= aux
->a_un
.a_val
;
5475 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5477 switch (aux
->a_type
)
5480 *phdr_memaddr
= aux
->a_un
.a_val
;
5483 *num_phdr
= aux
->a_un
.a_val
;
5491 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5493 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5494 "phdr_memaddr = %ld, phdr_num = %d",
5495 (long) *phdr_memaddr
, *num_phdr
);
5502 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5505 get_dynamic (const int pid
, const int is_elf64
)
5507 CORE_ADDR phdr_memaddr
, relocation
;
5509 unsigned char *phdr_buf
;
5510 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5512 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5515 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5516 phdr_buf
= alloca (num_phdr
* phdr_size
);
5518 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5521 /* Compute relocation: it is expected to be 0 for "regular" executables,
5522 non-zero for PIE ones. */
5524 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5527 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5529 if (p
->p_type
== PT_PHDR
)
5530 relocation
= phdr_memaddr
- p
->p_vaddr
;
5534 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5536 if (p
->p_type
== PT_PHDR
)
5537 relocation
= phdr_memaddr
- p
->p_vaddr
;
5540 if (relocation
== -1)
5542 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5543 any real world executables, including PIE executables, have always
5544 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5545 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5546 or present DT_DEBUG anyway (fpc binaries are statically linked).
5548 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5550 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5555 for (i
= 0; i
< num_phdr
; i
++)
5559 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5561 if (p
->p_type
== PT_DYNAMIC
)
5562 return p
->p_vaddr
+ relocation
;
5566 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5568 if (p
->p_type
== PT_DYNAMIC
)
5569 return p
->p_vaddr
+ relocation
;
5576 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5577 can be 0 if the inferior does not yet have the library list initialized.
5578 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5579 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5582 get_r_debug (const int pid
, const int is_elf64
)
5584 CORE_ADDR dynamic_memaddr
;
5585 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5586 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5589 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5590 if (dynamic_memaddr
== 0)
5593 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5597 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5598 #ifdef DT_MIPS_RLD_MAP
5602 unsigned char buf
[sizeof (Elf64_Xword
)];
5606 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5608 if (linux_read_memory (dyn
->d_un
.d_val
,
5609 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5614 #endif /* DT_MIPS_RLD_MAP */
5616 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5617 map
= dyn
->d_un
.d_val
;
5619 if (dyn
->d_tag
== DT_NULL
)
5624 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5625 #ifdef DT_MIPS_RLD_MAP
5629 unsigned char buf
[sizeof (Elf32_Word
)];
5633 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5635 if (linux_read_memory (dyn
->d_un
.d_val
,
5636 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5641 #endif /* DT_MIPS_RLD_MAP */
5643 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5644 map
= dyn
->d_un
.d_val
;
5646 if (dyn
->d_tag
== DT_NULL
)
5650 dynamic_memaddr
+= dyn_size
;
5656 /* Read one pointer from MEMADDR in the inferior. */
5659 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5663 /* Go through a union so this works on either big or little endian
5664 hosts, when the inferior's pointer size is smaller than the size
5665 of CORE_ADDR. It is assumed the inferior's endianness is the
5666 same of the superior's. */
5669 CORE_ADDR core_addr
;
5674 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5677 if (ptr_size
== sizeof (CORE_ADDR
))
5678 *ptr
= addr
.core_addr
;
5679 else if (ptr_size
== sizeof (unsigned int))
5682 gdb_assert_not_reached ("unhandled pointer size");
5687 struct link_map_offsets
5689 /* Offset and size of r_debug.r_version. */
5690 int r_version_offset
;
5692 /* Offset and size of r_debug.r_map. */
5695 /* Offset to l_addr field in struct link_map. */
5698 /* Offset to l_name field in struct link_map. */
5701 /* Offset to l_ld field in struct link_map. */
5704 /* Offset to l_next field in struct link_map. */
5707 /* Offset to l_prev field in struct link_map. */
5711 /* Construct qXfer:libraries-svr4:read reply. */
5714 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5715 unsigned const char *writebuf
,
5716 CORE_ADDR offset
, int len
)
5719 unsigned document_len
;
5720 struct process_info_private
*const priv
= current_process ()->private;
5721 char filename
[PATH_MAX
];
5724 static const struct link_map_offsets lmo_32bit_offsets
=
5726 0, /* r_version offset. */
5727 4, /* r_debug.r_map offset. */
5728 0, /* l_addr offset in link_map. */
5729 4, /* l_name offset in link_map. */
5730 8, /* l_ld offset in link_map. */
5731 12, /* l_next offset in link_map. */
5732 16 /* l_prev offset in link_map. */
5735 static const struct link_map_offsets lmo_64bit_offsets
=
5737 0, /* r_version offset. */
5738 8, /* r_debug.r_map offset. */
5739 0, /* l_addr offset in link_map. */
5740 8, /* l_name offset in link_map. */
5741 16, /* l_ld offset in link_map. */
5742 24, /* l_next offset in link_map. */
5743 32 /* l_prev offset in link_map. */
5745 const struct link_map_offsets
*lmo
;
5746 unsigned int machine
;
5748 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5749 int allocated
= 1024;
5751 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5752 int header_done
= 0;
5754 if (writebuf
!= NULL
)
5756 if (readbuf
== NULL
)
5759 pid
= lwpid_of (current_thread
);
5760 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5761 is_elf64
= elf_64_file_p (filename
, &machine
);
5762 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5763 ptr_size
= is_elf64
? 8 : 4;
5765 while (annex
[0] != '\0')
5771 sep
= strchr (annex
, '=');
5776 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5778 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5782 annex
= strchr (sep
, ';');
5789 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5796 if (priv
->r_debug
== 0)
5797 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5799 /* We failed to find DT_DEBUG. Such situation will not change
5800 for this inferior - do not retry it. Report it to GDB as
5801 E01, see for the reasons at the GDB solib-svr4.c side. */
5802 if (priv
->r_debug
== (CORE_ADDR
) -1)
5805 if (priv
->r_debug
!= 0)
5807 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5808 (unsigned char *) &r_version
,
5809 sizeof (r_version
)) != 0
5812 warning ("unexpected r_debug version %d", r_version
);
5814 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5815 &lm_addr
, ptr_size
) != 0)
5817 warning ("unable to read r_map from 0x%lx",
5818 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5823 document
= xmalloc (allocated
);
5824 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5825 p
= document
+ strlen (document
);
5828 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5829 &l_name
, ptr_size
) == 0
5830 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5831 &l_addr
, ptr_size
) == 0
5832 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5833 &l_ld
, ptr_size
) == 0
5834 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5835 &l_prev
, ptr_size
) == 0
5836 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5837 &l_next
, ptr_size
) == 0)
5839 unsigned char libname
[PATH_MAX
];
5841 if (lm_prev
!= l_prev
)
5843 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5844 (long) lm_prev
, (long) l_prev
);
5848 /* Ignore the first entry even if it has valid name as the first entry
5849 corresponds to the main executable. The first entry should not be
5850 skipped if the dynamic loader was loaded late by a static executable
5851 (see solib-svr4.c parameter ignore_first). But in such case the main
5852 executable does not have PT_DYNAMIC present and this function already
5853 exited above due to failed get_r_debug. */
5856 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5861 /* Not checking for error because reading may stop before
5862 we've got PATH_MAX worth of characters. */
5864 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5865 libname
[sizeof (libname
) - 1] = '\0';
5866 if (libname
[0] != '\0')
5868 /* 6x the size for xml_escape_text below. */
5869 size_t len
= 6 * strlen ((char *) libname
);
5874 /* Terminate `<library-list-svr4'. */
5879 while (allocated
< p
- document
+ len
+ 200)
5881 /* Expand to guarantee sufficient storage. */
5882 uintptr_t document_len
= p
- document
;
5884 document
= xrealloc (document
, 2 * allocated
);
5886 p
= document
+ document_len
;
5889 name
= xml_escape_text ((char *) libname
);
5890 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5891 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5892 name
, (unsigned long) lm_addr
,
5893 (unsigned long) l_addr
, (unsigned long) l_ld
);
5904 /* Empty list; terminate `<library-list-svr4'. */
5908 strcpy (p
, "</library-list-svr4>");
5910 document_len
= strlen (document
);
5911 if (offset
< document_len
)
5912 document_len
-= offset
;
5915 if (len
> document_len
)
5918 memcpy (readbuf
, document
+ offset
, len
);
5924 #ifdef HAVE_LINUX_BTRACE
5926 /* See to_enable_btrace target method. */
5928 static struct btrace_target_info
*
5929 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
5931 struct btrace_target_info
*tinfo
;
5933 tinfo
= linux_enable_btrace (ptid
, conf
);
5937 struct thread_info
*thread
= find_thread_ptid (ptid
);
5938 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5940 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5946 /* See to_disable_btrace target method. */
5949 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5951 enum btrace_error err
;
5953 err
= linux_disable_btrace (tinfo
);
5954 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5957 /* See to_read_btrace target method. */
5960 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5963 struct btrace_data btrace
;
5964 struct btrace_block
*block
;
5965 enum btrace_error err
;
5968 btrace_data_init (&btrace
);
5970 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5971 if (err
!= BTRACE_ERR_NONE
)
5973 if (err
== BTRACE_ERR_OVERFLOW
)
5974 buffer_grow_str0 (buffer
, "E.Overflow.");
5976 buffer_grow_str0 (buffer
, "E.Generic Error.");
5978 btrace_data_fini (&btrace
);
5982 switch (btrace
.format
)
5984 case BTRACE_FORMAT_NONE
:
5985 buffer_grow_str0 (buffer
, "E.No Trace.");
5988 case BTRACE_FORMAT_BTS
:
5989 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5990 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5993 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
5995 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5996 paddress (block
->begin
), paddress (block
->end
));
5998 buffer_grow_str0 (buffer
, "</btrace>\n");
6002 buffer_grow_str0 (buffer
, "E.Unknown Trace Format.");
6004 btrace_data_fini (&btrace
);
6008 btrace_data_fini (&btrace
);
6012 /* See to_btrace_conf target method. */
6015 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6016 struct buffer
*buffer
)
6018 const struct btrace_config
*conf
;
6020 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6021 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6023 conf
= linux_btrace_conf (tinfo
);
6026 switch (conf
->format
)
6028 case BTRACE_FORMAT_NONE
:
6031 case BTRACE_FORMAT_BTS
:
6032 buffer_xml_printf (buffer
, "<bts");
6033 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6034 buffer_xml_printf (buffer
, " />\n");
6039 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6042 #endif /* HAVE_LINUX_BTRACE */
6044 static struct target_ops linux_target_ops
= {
6045 linux_create_inferior
,
6054 linux_fetch_registers
,
6055 linux_store_registers
,
6056 linux_prepare_to_access_memory
,
6057 linux_done_accessing_memory
,
6060 linux_look_up_symbols
,
6061 linux_request_interrupt
,
6063 linux_supports_z_point_type
,
6066 linux_stopped_by_watchpoint
,
6067 linux_stopped_data_address
,
6068 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6069 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6070 && defined(PT_TEXT_END_ADDR)
6075 #ifdef USE_THREAD_DB
6076 thread_db_get_tls_address
,
6081 hostio_last_error_from_errno
,
6084 linux_supports_non_stop
,
6086 linux_start_non_stop
,
6087 linux_supports_multi_process
,
6088 #ifdef USE_THREAD_DB
6089 thread_db_handle_monitor_command
,
6093 linux_common_core_of_thread
,
6095 linux_process_qsupported
,
6096 linux_supports_tracepoints
,
6099 linux_thread_stopped
,
6103 linux_stabilize_threads
,
6104 linux_install_fast_tracepoint_jump_pad
,
6106 linux_supports_disable_randomization
,
6107 linux_get_min_fast_tracepoint_insn_len
,
6108 linux_qxfer_libraries_svr4
,
6109 linux_supports_agent
,
6110 #ifdef HAVE_LINUX_BTRACE
6111 linux_supports_btrace
,
6112 linux_low_enable_btrace
,
6113 linux_low_disable_btrace
,
6114 linux_low_read_btrace
,
6115 linux_low_btrace_conf
,
6123 linux_supports_range_stepping
,
6127 linux_init_signals ()
6129 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6130 to find what the cancel signal actually is. */
6131 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6132 signal (__SIGRTMIN
+1, SIG_IGN
);
6136 #ifdef HAVE_LINUX_REGSETS
6138 initialize_regsets_info (struct regsets_info
*info
)
6140 for (info
->num_regsets
= 0;
6141 info
->regsets
[info
->num_regsets
].size
>= 0;
6142 info
->num_regsets
++)
6148 initialize_low (void)
6150 struct sigaction sigchld_action
;
6151 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6152 set_target_ops (&linux_target_ops
);
6153 set_breakpoint_data (the_low_target
.breakpoint
,
6154 the_low_target
.breakpoint_len
);
6155 linux_init_signals ();
6156 linux_ptrace_init_warnings ();
6158 sigchld_action
.sa_handler
= sigchld_handler
;
6159 sigemptyset (&sigchld_action
.sa_mask
);
6160 sigchld_action
.sa_flags
= SA_RESTART
;
6161 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6163 initialize_low_arch ();