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
1292 if (!ptid_equal (minus_one_ptid
, ptid
)
1293 && ptid_get_pid (ptid
) != ptid_get_pid (thread
->entry
.id
))
1296 if (lp
->status_pending_p
1297 && !thread_still_has_status_pending_p (thread
))
1299 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1303 return lp
->status_pending_p
;
1307 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1309 ptid_t ptid
= *(ptid_t
*) data
;
1312 if (ptid_get_lwp (ptid
) != 0)
1313 lwp
= ptid_get_lwp (ptid
);
1315 lwp
= ptid_get_pid (ptid
);
1317 if (ptid_get_lwp (entry
->id
) == lwp
)
1324 find_lwp_pid (ptid_t ptid
)
1326 struct inferior_list_entry
*thread
1327 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1332 return get_thread_lwp ((struct thread_info
*) thread
);
1335 /* Return the number of known LWPs in the tgid given by PID. */
1340 struct inferior_list_entry
*inf
, *tmp
;
1343 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1345 if (ptid_get_pid (inf
->id
) == pid
)
1352 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1353 their exits until all other threads in the group have exited. */
1356 check_zombie_leaders (void)
1358 struct process_info
*proc
, *tmp
;
1360 ALL_PROCESSES (proc
, tmp
)
1362 pid_t leader_pid
= pid_of (proc
);
1363 struct lwp_info
*leader_lp
;
1365 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1368 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1369 "num_lwps=%d, zombie=%d\n",
1370 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1371 linux_proc_pid_is_zombie (leader_pid
));
1373 if (leader_lp
!= NULL
1374 /* Check if there are other threads in the group, as we may
1375 have raced with the inferior simply exiting. */
1376 && !last_thread_of_process_p (leader_pid
)
1377 && linux_proc_pid_is_zombie (leader_pid
))
1379 /* A leader zombie can mean one of two things:
1381 - It exited, and there's an exit status pending
1382 available, or only the leader exited (not the whole
1383 program). In the latter case, we can't waitpid the
1384 leader's exit status until all other threads are gone.
1386 - There are 3 or more threads in the group, and a thread
1387 other than the leader exec'd. On an exec, the Linux
1388 kernel destroys all other threads (except the execing
1389 one) in the thread group, and resets the execing thread's
1390 tid to the tgid. No exit notification is sent for the
1391 execing thread -- from the ptracer's perspective, it
1392 appears as though the execing thread just vanishes.
1393 Until we reap all other threads except the leader and the
1394 execing thread, the leader will be zombie, and the
1395 execing thread will be in `D (disc sleep)'. As soon as
1396 all other threads are reaped, the execing thread changes
1397 it's tid to the tgid, and the previous (zombie) leader
1398 vanishes, giving place to the "new" leader. We could try
1399 distinguishing the exit and exec cases, by waiting once
1400 more, and seeing if something comes out, but it doesn't
1401 sound useful. The previous leader _does_ go away, and
1402 we'll re-add the new one once we see the exec event
1403 (which is just the same as what would happen if the
1404 previous leader did exit voluntarily before some other
1409 "CZL: Thread group leader %d zombie "
1410 "(it exited, or another thread execd).\n",
1413 delete_lwp (leader_lp
);
1418 /* Callback for `find_inferior'. Returns the first LWP that is not
1419 stopped. ARG is a PTID filter. */
1422 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1424 struct thread_info
*thr
= (struct thread_info
*) entry
;
1425 struct lwp_info
*lwp
;
1426 ptid_t filter
= *(ptid_t
*) arg
;
1428 if (!ptid_match (ptid_of (thr
), filter
))
1431 lwp
= get_thread_lwp (thr
);
1438 /* This function should only be called if the LWP got a SIGTRAP.
1440 Handle any tracepoint steps or hits. Return true if a tracepoint
1441 event was handled, 0 otherwise. */
1444 handle_tracepoints (struct lwp_info
*lwp
)
1446 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1447 int tpoint_related_event
= 0;
1449 gdb_assert (lwp
->suspended
== 0);
1451 /* If this tracepoint hit causes a tracing stop, we'll immediately
1452 uninsert tracepoints. To do this, we temporarily pause all
1453 threads, unpatch away, and then unpause threads. We need to make
1454 sure the unpausing doesn't resume LWP too. */
1457 /* And we need to be sure that any all-threads-stopping doesn't try
1458 to move threads out of the jump pads, as it could deadlock the
1459 inferior (LWP could be in the jump pad, maybe even holding the
1462 /* Do any necessary step collect actions. */
1463 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1465 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1467 /* See if we just hit a tracepoint and do its main collect
1469 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1473 gdb_assert (lwp
->suspended
== 0);
1474 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1476 if (tpoint_related_event
)
1479 debug_printf ("got a tracepoint event\n");
1486 /* Convenience wrapper. Returns true if LWP is presently collecting a
1490 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1491 struct fast_tpoint_collect_status
*status
)
1493 CORE_ADDR thread_area
;
1494 struct thread_info
*thread
= get_lwp_thread (lwp
);
1496 if (the_low_target
.get_thread_area
== NULL
)
1499 /* Get the thread area address. This is used to recognize which
1500 thread is which when tracing with the in-process agent library.
1501 We don't read anything from the address, and treat it as opaque;
1502 it's the address itself that we assume is unique per-thread. */
1503 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1506 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1509 /* The reason we resume in the caller, is because we want to be able
1510 to pass lwp->status_pending as WSTAT, and we need to clear
1511 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1512 refuses to resume. */
1515 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1517 struct thread_info
*saved_thread
;
1519 saved_thread
= current_thread
;
1520 current_thread
= get_lwp_thread (lwp
);
1523 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1524 && supports_fast_tracepoints ()
1525 && agent_loaded_p ())
1527 struct fast_tpoint_collect_status status
;
1531 debug_printf ("Checking whether LWP %ld needs to move out of the "
1533 lwpid_of (current_thread
));
1535 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1538 || (WSTOPSIG (*wstat
) != SIGILL
1539 && WSTOPSIG (*wstat
) != SIGFPE
1540 && WSTOPSIG (*wstat
) != SIGSEGV
1541 && WSTOPSIG (*wstat
) != SIGBUS
))
1543 lwp
->collecting_fast_tracepoint
= r
;
1547 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1549 /* Haven't executed the original instruction yet.
1550 Set breakpoint there, and wait till it's hit,
1551 then single-step until exiting the jump pad. */
1552 lwp
->exit_jump_pad_bkpt
1553 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1557 debug_printf ("Checking whether LWP %ld needs to move out of "
1558 "the jump pad...it does\n",
1559 lwpid_of (current_thread
));
1560 current_thread
= saved_thread
;
1567 /* If we get a synchronous signal while collecting, *and*
1568 while executing the (relocated) original instruction,
1569 reset the PC to point at the tpoint address, before
1570 reporting to GDB. Otherwise, it's an IPA lib bug: just
1571 report the signal to GDB, and pray for the best. */
1573 lwp
->collecting_fast_tracepoint
= 0;
1576 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1577 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1580 struct regcache
*regcache
;
1582 /* The si_addr on a few signals references the address
1583 of the faulting instruction. Adjust that as
1585 if ((WSTOPSIG (*wstat
) == SIGILL
1586 || WSTOPSIG (*wstat
) == SIGFPE
1587 || WSTOPSIG (*wstat
) == SIGBUS
1588 || WSTOPSIG (*wstat
) == SIGSEGV
)
1589 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1590 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1591 /* Final check just to make sure we don't clobber
1592 the siginfo of non-kernel-sent signals. */
1593 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1595 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1596 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1597 (PTRACE_TYPE_ARG3
) 0, &info
);
1600 regcache
= get_thread_regcache (current_thread
, 1);
1601 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1602 lwp
->stop_pc
= status
.tpoint_addr
;
1604 /* Cancel any fast tracepoint lock this thread was
1606 force_unlock_trace_buffer ();
1609 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1612 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1613 "stopping all threads momentarily.\n");
1615 stop_all_lwps (1, lwp
);
1617 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1618 lwp
->exit_jump_pad_bkpt
= NULL
;
1620 unstop_all_lwps (1, lwp
);
1622 gdb_assert (lwp
->suspended
>= 0);
1628 debug_printf ("Checking whether LWP %ld needs to move out of the "
1630 lwpid_of (current_thread
));
1632 current_thread
= saved_thread
;
1636 /* Enqueue one signal in the "signals to report later when out of the
1640 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1642 struct pending_signals
*p_sig
;
1643 struct thread_info
*thread
= get_lwp_thread (lwp
);
1646 debug_printf ("Deferring signal %d for LWP %ld.\n",
1647 WSTOPSIG (*wstat
), lwpid_of (thread
));
1651 struct pending_signals
*sig
;
1653 for (sig
= lwp
->pending_signals_to_report
;
1656 debug_printf (" Already queued %d\n",
1659 debug_printf (" (no more currently queued signals)\n");
1662 /* Don't enqueue non-RT signals if they are already in the deferred
1663 queue. (SIGSTOP being the easiest signal to see ending up here
1665 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1667 struct pending_signals
*sig
;
1669 for (sig
= lwp
->pending_signals_to_report
;
1673 if (sig
->signal
== WSTOPSIG (*wstat
))
1676 debug_printf ("Not requeuing already queued non-RT signal %d"
1685 p_sig
= xmalloc (sizeof (*p_sig
));
1686 p_sig
->prev
= lwp
->pending_signals_to_report
;
1687 p_sig
->signal
= WSTOPSIG (*wstat
);
1688 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1689 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1692 lwp
->pending_signals_to_report
= p_sig
;
1695 /* Dequeue one signal from the "signals to report later when out of
1696 the jump pad" list. */
1699 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1701 struct thread_info
*thread
= get_lwp_thread (lwp
);
1703 if (lwp
->pending_signals_to_report
!= NULL
)
1705 struct pending_signals
**p_sig
;
1707 p_sig
= &lwp
->pending_signals_to_report
;
1708 while ((*p_sig
)->prev
!= NULL
)
1709 p_sig
= &(*p_sig
)->prev
;
1711 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1712 if ((*p_sig
)->info
.si_signo
!= 0)
1713 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1719 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1720 WSTOPSIG (*wstat
), lwpid_of (thread
));
1724 struct pending_signals
*sig
;
1726 for (sig
= lwp
->pending_signals_to_report
;
1729 debug_printf (" Still queued %d\n",
1732 debug_printf (" (no more queued signals)\n");
1741 /* Fetch the possibly triggered data watchpoint info and store it in
1744 On some archs, like x86, that use debug registers to set
1745 watchpoints, it's possible that the way to know which watched
1746 address trapped, is to check the register that is used to select
1747 which address to watch. Problem is, between setting the watchpoint
1748 and reading back which data address trapped, the user may change
1749 the set of watchpoints, and, as a consequence, GDB changes the
1750 debug registers in the inferior. To avoid reading back a stale
1751 stopped-data-address when that happens, we cache in LP the fact
1752 that a watchpoint trapped, and the corresponding data address, as
1753 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
1754 registers meanwhile, we have the cached data we can rely on. */
1757 check_stopped_by_watchpoint (struct lwp_info
*child
)
1759 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
1761 struct thread_info
*saved_thread
;
1763 saved_thread
= current_thread
;
1764 current_thread
= get_lwp_thread (child
);
1766 if (the_low_target
.stopped_by_watchpoint ())
1768 child
->stop_reason
= LWP_STOPPED_BY_WATCHPOINT
;
1770 if (the_low_target
.stopped_data_address
!= NULL
)
1771 child
->stopped_data_address
1772 = the_low_target
.stopped_data_address ();
1774 child
->stopped_data_address
= 0;
1777 current_thread
= saved_thread
;
1780 return child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
1783 /* Do low-level handling of the event, and check if we should go on
1784 and pass it to caller code. Return the affected lwp if we are, or
1787 static struct lwp_info
*
1788 linux_low_filter_event (int lwpid
, int wstat
)
1790 struct lwp_info
*child
;
1791 struct thread_info
*thread
;
1792 int have_stop_pc
= 0;
1794 child
= find_lwp_pid (pid_to_ptid (lwpid
));
1796 /* If we didn't find a process, one of two things presumably happened:
1797 - A process we started and then detached from has exited. Ignore it.
1798 - A process we are controlling has forked and the new child's stop
1799 was reported to us by the kernel. Save its PID. */
1800 if (child
== NULL
&& WIFSTOPPED (wstat
))
1802 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
1805 else if (child
== NULL
)
1808 thread
= get_lwp_thread (child
);
1812 child
->last_status
= wstat
;
1814 /* Check if the thread has exited. */
1815 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
1818 debug_printf ("LLFE: %d exited.\n", lwpid
);
1819 if (num_lwps (pid_of (thread
)) > 1)
1822 /* If there is at least one more LWP, then the exit signal was
1823 not the end of the debugged application and should be
1830 /* This was the last lwp in the process. Since events are
1831 serialized to GDB core, and we can't report this one
1832 right now, but GDB core and the other target layers will
1833 want to be notified about the exit code/signal, leave the
1834 status pending for the next time we're able to report
1836 mark_lwp_dead (child
, wstat
);
1841 gdb_assert (WIFSTOPPED (wstat
));
1843 if (WIFSTOPPED (wstat
))
1845 struct process_info
*proc
;
1847 /* Architecture-specific setup after inferior is running. This
1848 needs to happen after we have attached to the inferior and it
1849 is stopped for the first time, but before we access any
1850 inferior registers. */
1851 proc
= find_process_pid (pid_of (thread
));
1852 if (proc
->private->new_inferior
)
1854 struct thread_info
*saved_thread
;
1856 saved_thread
= current_thread
;
1857 current_thread
= thread
;
1859 the_low_target
.arch_setup ();
1861 current_thread
= saved_thread
;
1863 proc
->private->new_inferior
= 0;
1867 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
1869 struct process_info
*proc
= find_process_pid (pid_of (thread
));
1871 linux_enable_event_reporting (lwpid
, proc
->attached
);
1872 child
->must_set_ptrace_flags
= 0;
1875 /* Be careful to not overwrite stop_pc until
1876 check_stopped_by_breakpoint is called. */
1877 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1878 && linux_is_extended_waitstatus (wstat
))
1880 child
->stop_pc
= get_pc (child
);
1881 handle_extended_wait (child
, wstat
);
1885 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
1886 && check_stopped_by_watchpoint (child
))
1888 else if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
1890 if (check_stopped_by_breakpoint (child
))
1895 child
->stop_pc
= get_pc (child
);
1897 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
1898 && child
->stop_expected
)
1901 debug_printf ("Expected stop.\n");
1902 child
->stop_expected
= 0;
1904 if (thread
->last_resume_kind
== resume_stop
)
1906 /* We want to report the stop to the core. Treat the
1907 SIGSTOP as a normal event. */
1909 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
1911 /* Stopping threads. We don't want this SIGSTOP to end up
1917 /* Filter out the event. */
1918 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
1923 child
->status_pending_p
= 1;
1924 child
->status_pending
= wstat
;
1928 /* Resume LWPs that are currently stopped without any pending status
1929 to report, but are resumed from the core's perspective. */
1932 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
1934 struct thread_info
*thread
= (struct thread_info
*) entry
;
1935 struct lwp_info
*lp
= get_thread_lwp (thread
);
1938 && !lp
->status_pending_p
1939 && thread
->last_resume_kind
!= resume_stop
1940 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
1942 int step
= thread
->last_resume_kind
== resume_step
;
1945 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
1946 target_pid_to_str (ptid_of (thread
)),
1947 paddress (lp
->stop_pc
),
1950 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
1954 /* Wait for an event from child(ren) WAIT_PTID, and return any that
1955 match FILTER_PTID (leaving others pending). The PTIDs can be:
1956 minus_one_ptid, to specify any child; a pid PTID, specifying all
1957 lwps of a thread group; or a PTID representing a single lwp. Store
1958 the stop status through the status pointer WSTAT. OPTIONS is
1959 passed to the waitpid call. Return 0 if no event was found and
1960 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
1961 was found. Return the PID of the stopped child otherwise. */
1964 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
1965 int *wstatp
, int options
)
1967 struct thread_info
*event_thread
;
1968 struct lwp_info
*event_child
, *requested_child
;
1969 sigset_t block_mask
, prev_mask
;
1972 /* N.B. event_thread points to the thread_info struct that contains
1973 event_child. Keep them in sync. */
1974 event_thread
= NULL
;
1976 requested_child
= NULL
;
1978 /* Check for a lwp with a pending status. */
1980 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
1982 event_thread
= (struct thread_info
*)
1983 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
1984 if (event_thread
!= NULL
)
1985 event_child
= get_thread_lwp (event_thread
);
1986 if (debug_threads
&& event_thread
)
1987 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
1989 else if (!ptid_equal (filter_ptid
, null_ptid
))
1991 requested_child
= find_lwp_pid (filter_ptid
);
1993 if (stopping_threads
== NOT_STOPPING_THREADS
1994 && requested_child
->status_pending_p
1995 && requested_child
->collecting_fast_tracepoint
)
1997 enqueue_one_deferred_signal (requested_child
,
1998 &requested_child
->status_pending
);
1999 requested_child
->status_pending_p
= 0;
2000 requested_child
->status_pending
= 0;
2001 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2004 if (requested_child
->suspended
2005 && requested_child
->status_pending_p
)
2007 internal_error (__FILE__
, __LINE__
,
2008 "requesting an event out of a"
2009 " suspended child?");
2012 if (requested_child
->status_pending_p
)
2014 event_child
= requested_child
;
2015 event_thread
= get_lwp_thread (event_child
);
2019 if (event_child
!= NULL
)
2022 debug_printf ("Got an event from pending child %ld (%04x)\n",
2023 lwpid_of (event_thread
), event_child
->status_pending
);
2024 *wstatp
= event_child
->status_pending
;
2025 event_child
->status_pending_p
= 0;
2026 event_child
->status_pending
= 0;
2027 current_thread
= event_thread
;
2028 return lwpid_of (event_thread
);
2031 /* But if we don't find a pending event, we'll have to wait.
2033 We only enter this loop if no process has a pending wait status.
2034 Thus any action taken in response to a wait status inside this
2035 loop is responding as soon as we detect the status, not after any
2038 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2039 all signals while here. */
2040 sigfillset (&block_mask
);
2041 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2043 /* Always pull all events out of the kernel. We'll randomly select
2044 an event LWP out of all that have events, to prevent
2046 while (event_child
== NULL
)
2050 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2053 - If the thread group leader exits while other threads in the
2054 thread group still exist, waitpid(TGID, ...) hangs. That
2055 waitpid won't return an exit status until the other threads
2056 in the group are reaped.
2058 - When a non-leader thread execs, that thread just vanishes
2059 without reporting an exit (so we'd hang if we waited for it
2060 explicitly in that case). The exec event is reported to
2061 the TGID pid (although we don't currently enable exec
2064 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2067 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2068 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2074 debug_printf ("LLW: waitpid %ld received %s\n",
2075 (long) ret
, status_to_str (*wstatp
));
2078 /* Filter all events. IOW, leave all events pending. We'll
2079 randomly select an event LWP out of all that have events
2081 linux_low_filter_event (ret
, *wstatp
);
2082 /* Retry until nothing comes out of waitpid. A single
2083 SIGCHLD can indicate more than one child stopped. */
2087 /* Now that we've pulled all events out of the kernel, resume
2088 LWPs that don't have an interesting event to report. */
2089 if (stopping_threads
== NOT_STOPPING_THREADS
)
2090 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2092 /* ... and find an LWP with a status to report to the core, if
2094 event_thread
= (struct thread_info
*)
2095 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2096 if (event_thread
!= NULL
)
2098 event_child
= get_thread_lwp (event_thread
);
2099 *wstatp
= event_child
->status_pending
;
2100 event_child
->status_pending_p
= 0;
2101 event_child
->status_pending
= 0;
2105 /* Check for zombie thread group leaders. Those can't be reaped
2106 until all other threads in the thread group are. */
2107 check_zombie_leaders ();
2109 /* If there are no resumed children left in the set of LWPs we
2110 want to wait for, bail. We can't just block in
2111 waitpid/sigsuspend, because lwps might have been left stopped
2112 in trace-stop state, and we'd be stuck forever waiting for
2113 their status to change (which would only happen if we resumed
2114 them). Even if WNOHANG is set, this return code is preferred
2115 over 0 (below), as it is more detailed. */
2116 if ((find_inferior (&all_threads
,
2117 not_stopped_callback
,
2118 &wait_ptid
) == NULL
))
2121 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2122 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2126 /* No interesting event to report to the caller. */
2127 if ((options
& WNOHANG
))
2130 debug_printf ("WNOHANG set, no event found\n");
2132 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2136 /* Block until we get an event reported with SIGCHLD. */
2138 debug_printf ("sigsuspend'ing\n");
2140 sigsuspend (&prev_mask
);
2141 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2145 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2147 current_thread
= event_thread
;
2149 /* Check for thread exit. */
2150 if (! WIFSTOPPED (*wstatp
))
2152 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2155 debug_printf ("LWP %d is the last lwp of process. "
2156 "Process %ld exiting.\n",
2157 pid_of (event_thread
), lwpid_of (event_thread
));
2158 return lwpid_of (event_thread
);
2161 return lwpid_of (event_thread
);
2164 /* Wait for an event from child(ren) PTID. PTIDs can be:
2165 minus_one_ptid, to specify any child; a pid PTID, specifying all
2166 lwps of a thread group; or a PTID representing a single lwp. Store
2167 the stop status through the status pointer WSTAT. OPTIONS is
2168 passed to the waitpid call. Return 0 if no event was found and
2169 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2170 was found. Return the PID of the stopped child otherwise. */
2173 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2175 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2178 /* Count the LWP's that have had events. */
2181 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2183 struct thread_info
*thread
= (struct thread_info
*) entry
;
2186 gdb_assert (count
!= NULL
);
2188 /* Count only resumed LWPs that have an event pending. */
2189 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2190 && thread
->last_resume_kind
!= resume_stop
2191 && thread
->status_pending_p
)
2197 /* Select the LWP (if any) that is currently being single-stepped. */
2200 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2202 struct thread_info
*thread
= (struct thread_info
*) entry
;
2203 struct lwp_info
*lp
= get_thread_lwp (thread
);
2205 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2206 && thread
->last_resume_kind
== resume_step
2207 && lp
->status_pending_p
)
2213 /* Select the Nth LWP that has had a SIGTRAP event that should be
2217 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2219 struct thread_info
*thread
= (struct thread_info
*) entry
;
2220 int *selector
= data
;
2222 gdb_assert (selector
!= NULL
);
2224 /* Select only resumed LWPs that have an event pending. */
2225 if (thread
->last_resume_kind
!= resume_stop
2226 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2227 && thread
->status_pending_p
)
2228 if ((*selector
)-- == 0)
2234 /* Select one LWP out of those that have events pending. */
2237 select_event_lwp (struct lwp_info
**orig_lp
)
2240 int random_selector
;
2241 struct thread_info
*event_thread
= NULL
;
2243 /* In all-stop, give preference to the LWP that is being
2244 single-stepped. There will be at most one, and it's the LWP that
2245 the core is most interested in. If we didn't do this, then we'd
2246 have to handle pending step SIGTRAPs somehow in case the core
2247 later continues the previously-stepped thread, otherwise we'd
2248 report the pending SIGTRAP, and the core, not having stepped the
2249 thread, wouldn't understand what the trap was for, and therefore
2250 would report it to the user as a random signal. */
2254 = (struct thread_info
*) find_inferior (&all_threads
,
2255 select_singlestep_lwp_callback
,
2257 if (event_thread
!= NULL
)
2260 debug_printf ("SEL: Select single-step %s\n",
2261 target_pid_to_str (ptid_of (event_thread
)));
2264 if (event_thread
== NULL
)
2266 /* No single-stepping LWP. Select one at random, out of those
2267 which have had SIGTRAP events. */
2269 /* First see how many SIGTRAP events we have. */
2270 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2272 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2273 random_selector
= (int)
2274 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2276 if (debug_threads
&& num_events
> 1)
2277 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2278 num_events
, random_selector
);
2281 = (struct thread_info
*) find_inferior (&all_threads
,
2282 select_event_lwp_callback
,
2286 if (event_thread
!= NULL
)
2288 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2290 /* Switch the event LWP. */
2291 *orig_lp
= event_lp
;
2295 /* Decrement the suspend count of an LWP. */
2298 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2300 struct thread_info
*thread
= (struct thread_info
*) entry
;
2301 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2303 /* Ignore EXCEPT. */
2309 gdb_assert (lwp
->suspended
>= 0);
2313 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2317 unsuspend_all_lwps (struct lwp_info
*except
)
2319 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2322 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2323 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2325 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2326 static ptid_t
linux_wait_1 (ptid_t ptid
,
2327 struct target_waitstatus
*ourstatus
,
2328 int target_options
);
2330 /* Stabilize threads (move out of jump pads).
2332 If a thread is midway collecting a fast tracepoint, we need to
2333 finish the collection and move it out of the jump pad before
2334 reporting the signal.
2336 This avoids recursion while collecting (when a signal arrives
2337 midway, and the signal handler itself collects), which would trash
2338 the trace buffer. In case the user set a breakpoint in a signal
2339 handler, this avoids the backtrace showing the jump pad, etc..
2340 Most importantly, there are certain things we can't do safely if
2341 threads are stopped in a jump pad (or in its callee's). For
2344 - starting a new trace run. A thread still collecting the
2345 previous run, could trash the trace buffer when resumed. The trace
2346 buffer control structures would have been reset but the thread had
2347 no way to tell. The thread could even midway memcpy'ing to the
2348 buffer, which would mean that when resumed, it would clobber the
2349 trace buffer that had been set for a new run.
2351 - we can't rewrite/reuse the jump pads for new tracepoints
2352 safely. Say you do tstart while a thread is stopped midway while
2353 collecting. When the thread is later resumed, it finishes the
2354 collection, and returns to the jump pad, to execute the original
2355 instruction that was under the tracepoint jump at the time the
2356 older run had been started. If the jump pad had been rewritten
2357 since for something else in the new run, the thread would now
2358 execute the wrong / random instructions. */
2361 linux_stabilize_threads (void)
2363 struct thread_info
*saved_thread
;
2364 struct thread_info
*thread_stuck
;
2367 = (struct thread_info
*) find_inferior (&all_threads
,
2368 stuck_in_jump_pad_callback
,
2370 if (thread_stuck
!= NULL
)
2373 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2374 lwpid_of (thread_stuck
));
2378 saved_thread
= current_thread
;
2380 stabilizing_threads
= 1;
2383 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2385 /* Loop until all are stopped out of the jump pads. */
2386 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2388 struct target_waitstatus ourstatus
;
2389 struct lwp_info
*lwp
;
2392 /* Note that we go through the full wait even loop. While
2393 moving threads out of jump pad, we need to be able to step
2394 over internal breakpoints and such. */
2395 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2397 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2399 lwp
= get_thread_lwp (current_thread
);
2404 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2405 || current_thread
->last_resume_kind
== resume_stop
)
2407 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2408 enqueue_one_deferred_signal (lwp
, &wstat
);
2413 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2415 stabilizing_threads
= 0;
2417 current_thread
= saved_thread
;
2422 = (struct thread_info
*) find_inferior (&all_threads
,
2423 stuck_in_jump_pad_callback
,
2425 if (thread_stuck
!= NULL
)
2426 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2427 lwpid_of (thread_stuck
));
2431 static void async_file_mark (void);
2433 /* Convenience function that is called when the kernel reports an
2434 event that is not passed out to GDB. */
2437 ignore_event (struct target_waitstatus
*ourstatus
)
2439 /* If we got an event, there may still be others, as a single
2440 SIGCHLD can indicate more than one child stopped. This forces
2441 another target_wait call. */
2444 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2448 /* Wait for process, returns status. */
2451 linux_wait_1 (ptid_t ptid
,
2452 struct target_waitstatus
*ourstatus
, int target_options
)
2455 struct lwp_info
*event_child
;
2458 int step_over_finished
;
2459 int bp_explains_trap
;
2460 int maybe_internal_trap
;
2468 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2471 /* Translate generic target options into linux options. */
2473 if (target_options
& TARGET_WNOHANG
)
2476 bp_explains_trap
= 0;
2479 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2481 if (ptid_equal (step_over_bkpt
, null_ptid
))
2482 pid
= linux_wait_for_event (ptid
, &w
, options
);
2486 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2487 target_pid_to_str (step_over_bkpt
));
2488 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2493 gdb_assert (target_options
& TARGET_WNOHANG
);
2497 debug_printf ("linux_wait_1 ret = null_ptid, "
2498 "TARGET_WAITKIND_IGNORE\n");
2502 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2509 debug_printf ("linux_wait_1 ret = null_ptid, "
2510 "TARGET_WAITKIND_NO_RESUMED\n");
2514 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2518 event_child
= get_thread_lwp (current_thread
);
2520 /* linux_wait_for_event only returns an exit status for the last
2521 child of a process. Report it. */
2522 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2526 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2527 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2531 debug_printf ("linux_wait_1 ret = %s, exited with "
2533 target_pid_to_str (ptid_of (current_thread
)),
2540 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2541 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2545 debug_printf ("linux_wait_1 ret = %s, terminated with "
2547 target_pid_to_str (ptid_of (current_thread
)),
2553 return ptid_of (current_thread
);
2556 /* If this event was not handled before, and is not a SIGTRAP, we
2557 report it. SIGILL and SIGSEGV are also treated as traps in case
2558 a breakpoint is inserted at the current PC. If this target does
2559 not support internal breakpoints at all, we also report the
2560 SIGTRAP without further processing; it's of no concern to us. */
2562 = (supports_breakpoints ()
2563 && (WSTOPSIG (w
) == SIGTRAP
2564 || ((WSTOPSIG (w
) == SIGILL
2565 || WSTOPSIG (w
) == SIGSEGV
)
2566 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2568 if (maybe_internal_trap
)
2570 /* Handle anything that requires bookkeeping before deciding to
2571 report the event or continue waiting. */
2573 /* First check if we can explain the SIGTRAP with an internal
2574 breakpoint, or if we should possibly report the event to GDB.
2575 Do this before anything that may remove or insert a
2577 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2579 /* We have a SIGTRAP, possibly a step-over dance has just
2580 finished. If so, tweak the state machine accordingly,
2581 reinsert breakpoints and delete any reinsert (software
2582 single-step) breakpoints. */
2583 step_over_finished
= finish_step_over (event_child
);
2585 /* Now invoke the callbacks of any internal breakpoints there. */
2586 check_breakpoints (event_child
->stop_pc
);
2588 /* Handle tracepoint data collecting. This may overflow the
2589 trace buffer, and cause a tracing stop, removing
2591 trace_event
= handle_tracepoints (event_child
);
2593 if (bp_explains_trap
)
2595 /* If we stepped or ran into an internal breakpoint, we've
2596 already handled it. So next time we resume (from this
2597 PC), we should step over it. */
2599 debug_printf ("Hit a gdbserver breakpoint.\n");
2601 if (breakpoint_here (event_child
->stop_pc
))
2602 event_child
->need_step_over
= 1;
2607 /* We have some other signal, possibly a step-over dance was in
2608 progress, and it should be cancelled too. */
2609 step_over_finished
= finish_step_over (event_child
);
2612 /* We have all the data we need. Either report the event to GDB, or
2613 resume threads and keep waiting for more. */
2615 /* If we're collecting a fast tracepoint, finish the collection and
2616 move out of the jump pad before delivering a signal. See
2617 linux_stabilize_threads. */
2620 && WSTOPSIG (w
) != SIGTRAP
2621 && supports_fast_tracepoints ()
2622 && agent_loaded_p ())
2625 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2626 "to defer or adjust it.\n",
2627 WSTOPSIG (w
), lwpid_of (current_thread
));
2629 /* Allow debugging the jump pad itself. */
2630 if (current_thread
->last_resume_kind
!= resume_step
2631 && maybe_move_out_of_jump_pad (event_child
, &w
))
2633 enqueue_one_deferred_signal (event_child
, &w
);
2636 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2637 WSTOPSIG (w
), lwpid_of (current_thread
));
2639 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2641 return ignore_event (ourstatus
);
2645 if (event_child
->collecting_fast_tracepoint
)
2648 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2649 "Check if we're already there.\n",
2650 lwpid_of (current_thread
),
2651 event_child
->collecting_fast_tracepoint
);
2655 event_child
->collecting_fast_tracepoint
2656 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2658 if (event_child
->collecting_fast_tracepoint
!= 1)
2660 /* No longer need this breakpoint. */
2661 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2664 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2665 "stopping all threads momentarily.\n");
2667 /* Other running threads could hit this breakpoint.
2668 We don't handle moribund locations like GDB does,
2669 instead we always pause all threads when removing
2670 breakpoints, so that any step-over or
2671 decr_pc_after_break adjustment is always taken
2672 care of while the breakpoint is still
2674 stop_all_lwps (1, event_child
);
2676 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2677 event_child
->exit_jump_pad_bkpt
= NULL
;
2679 unstop_all_lwps (1, event_child
);
2681 gdb_assert (event_child
->suspended
>= 0);
2685 if (event_child
->collecting_fast_tracepoint
== 0)
2688 debug_printf ("fast tracepoint finished "
2689 "collecting successfully.\n");
2691 /* We may have a deferred signal to report. */
2692 if (dequeue_one_deferred_signal (event_child
, &w
))
2695 debug_printf ("dequeued one signal.\n");
2700 debug_printf ("no deferred signals.\n");
2702 if (stabilizing_threads
)
2704 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2705 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2709 debug_printf ("linux_wait_1 ret = %s, stopped "
2710 "while stabilizing threads\n",
2711 target_pid_to_str (ptid_of (current_thread
)));
2715 return ptid_of (current_thread
);
2721 /* Check whether GDB would be interested in this event. */
2723 /* If GDB is not interested in this signal, don't stop other
2724 threads, and don't report it to GDB. Just resume the inferior
2725 right away. We do this for threading-related signals as well as
2726 any that GDB specifically requested we ignore. But never ignore
2727 SIGSTOP if we sent it ourselves, and do not ignore signals when
2728 stepping - they may require special handling to skip the signal
2729 handler. Also never ignore signals that could be caused by a
2731 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2734 && current_thread
->last_resume_kind
!= resume_step
2736 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2737 (current_process ()->private->thread_db
!= NULL
2738 && (WSTOPSIG (w
) == __SIGRTMIN
2739 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2742 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2743 && !(WSTOPSIG (w
) == SIGSTOP
2744 && current_thread
->last_resume_kind
== resume_stop
)
2745 && !linux_wstatus_maybe_breakpoint (w
))))
2747 siginfo_t info
, *info_p
;
2750 debug_printf ("Ignored signal %d for LWP %ld.\n",
2751 WSTOPSIG (w
), lwpid_of (current_thread
));
2753 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
2754 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2758 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2759 WSTOPSIG (w
), info_p
);
2760 return ignore_event (ourstatus
);
2763 /* Note that all addresses are always "out of the step range" when
2764 there's no range to begin with. */
2765 in_step_range
= lwp_in_step_range (event_child
);
2767 /* If GDB wanted this thread to single step, and the thread is out
2768 of the step range, we always want to report the SIGTRAP, and let
2769 GDB handle it. Watchpoints should always be reported. So should
2770 signals we can't explain. A SIGTRAP we can't explain could be a
2771 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2772 do, we're be able to handle GDB breakpoints on top of internal
2773 breakpoints, by handling the internal breakpoint and still
2774 reporting the event to GDB. If we don't, we're out of luck, GDB
2775 won't see the breakpoint hit. */
2776 report_to_gdb
= (!maybe_internal_trap
2777 || (current_thread
->last_resume_kind
== resume_step
2779 || event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
2780 || (!step_over_finished
&& !in_step_range
2781 && !bp_explains_trap
&& !trace_event
)
2782 || (gdb_breakpoint_here (event_child
->stop_pc
)
2783 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2784 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2786 run_breakpoint_commands (event_child
->stop_pc
);
2788 /* We found no reason GDB would want us to stop. We either hit one
2789 of our own breakpoints, or finished an internal step GDB
2790 shouldn't know about. */
2795 if (bp_explains_trap
)
2796 debug_printf ("Hit a gdbserver breakpoint.\n");
2797 if (step_over_finished
)
2798 debug_printf ("Step-over finished.\n");
2800 debug_printf ("Tracepoint event.\n");
2801 if (lwp_in_step_range (event_child
))
2802 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2803 paddress (event_child
->stop_pc
),
2804 paddress (event_child
->step_range_start
),
2805 paddress (event_child
->step_range_end
));
2808 /* We're not reporting this breakpoint to GDB, so apply the
2809 decr_pc_after_break adjustment to the inferior's regcache
2812 if (the_low_target
.set_pc
!= NULL
)
2814 struct regcache
*regcache
2815 = get_thread_regcache (current_thread
, 1);
2816 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2819 /* We may have finished stepping over a breakpoint. If so,
2820 we've stopped and suspended all LWPs momentarily except the
2821 stepping one. This is where we resume them all again. We're
2822 going to keep waiting, so use proceed, which handles stepping
2823 over the next breakpoint. */
2825 debug_printf ("proceeding all threads.\n");
2827 if (step_over_finished
)
2828 unsuspend_all_lwps (event_child
);
2830 proceed_all_lwps ();
2831 return ignore_event (ourstatus
);
2836 if (current_thread
->last_resume_kind
== resume_step
)
2838 if (event_child
->step_range_start
== event_child
->step_range_end
)
2839 debug_printf ("GDB wanted to single-step, reporting event.\n");
2840 else if (!lwp_in_step_range (event_child
))
2841 debug_printf ("Out of step range, reporting event.\n");
2843 if (event_child
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
)
2844 debug_printf ("Stopped by watchpoint.\n");
2845 else if (gdb_breakpoint_here (event_child
->stop_pc
))
2846 debug_printf ("Stopped by GDB breakpoint.\n");
2848 debug_printf ("Hit a non-gdbserver trap event.\n");
2851 /* Alright, we're going to report a stop. */
2853 if (!stabilizing_threads
)
2855 /* In all-stop, stop all threads. */
2857 stop_all_lwps (0, NULL
);
2859 /* If we're not waiting for a specific LWP, choose an event LWP
2860 from among those that have had events. Giving equal priority
2861 to all LWPs that have had events helps prevent
2863 if (ptid_equal (ptid
, minus_one_ptid
))
2865 event_child
->status_pending_p
= 1;
2866 event_child
->status_pending
= w
;
2868 select_event_lwp (&event_child
);
2870 /* current_thread and event_child must stay in sync. */
2871 current_thread
= get_lwp_thread (event_child
);
2873 event_child
->status_pending_p
= 0;
2874 w
= event_child
->status_pending
;
2877 if (step_over_finished
)
2881 /* If we were doing a step-over, all other threads but
2882 the stepping one had been paused in start_step_over,
2883 with their suspend counts incremented. We don't want
2884 to do a full unstop/unpause, because we're in
2885 all-stop mode (so we want threads stopped), but we
2886 still need to unsuspend the other threads, to
2887 decrement their `suspended' count back. */
2888 unsuspend_all_lwps (event_child
);
2892 /* If we just finished a step-over, then all threads had
2893 been momentarily paused. In all-stop, that's fine,
2894 we want threads stopped by now anyway. In non-stop,
2895 we need to re-resume threads that GDB wanted to be
2897 unstop_all_lwps (1, event_child
);
2901 /* Stabilize threads (move out of jump pads). */
2903 stabilize_threads ();
2907 /* If we just finished a step-over, then all threads had been
2908 momentarily paused. In all-stop, that's fine, we want
2909 threads stopped by now anyway. In non-stop, we need to
2910 re-resume threads that GDB wanted to be running. */
2911 if (step_over_finished
)
2912 unstop_all_lwps (1, event_child
);
2915 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2917 /* Now that we've selected our final event LWP, un-adjust its PC if
2918 it was a software breakpoint. */
2919 if (event_child
->stop_reason
== LWP_STOPPED_BY_SW_BREAKPOINT
)
2921 int decr_pc
= the_low_target
.decr_pc_after_break
;
2925 struct regcache
*regcache
2926 = get_thread_regcache (current_thread
, 1);
2927 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
2931 if (current_thread
->last_resume_kind
== resume_stop
2932 && WSTOPSIG (w
) == SIGSTOP
)
2934 /* A thread that has been requested to stop by GDB with vCont;t,
2935 and it stopped cleanly, so report as SIG0. The use of
2936 SIGSTOP is an implementation detail. */
2937 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2939 else if (current_thread
->last_resume_kind
== resume_stop
2940 && WSTOPSIG (w
) != SIGSTOP
)
2942 /* A thread that has been requested to stop by GDB with vCont;t,
2943 but, it stopped for other reasons. */
2944 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2948 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2951 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2955 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2956 target_pid_to_str (ptid_of (current_thread
)),
2957 ourstatus
->kind
, ourstatus
->value
.sig
);
2961 return ptid_of (current_thread
);
2964 /* Get rid of any pending event in the pipe. */
2966 async_file_flush (void)
2972 ret
= read (linux_event_pipe
[0], &buf
, 1);
2973 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2976 /* Put something in the pipe, so the event loop wakes up. */
2978 async_file_mark (void)
2982 async_file_flush ();
2985 ret
= write (linux_event_pipe
[1], "+", 1);
2986 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2988 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2989 be awakened anyway. */
2993 linux_wait (ptid_t ptid
,
2994 struct target_waitstatus
*ourstatus
, int target_options
)
2998 /* Flush the async file first. */
2999 if (target_is_async_p ())
3000 async_file_flush ();
3004 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3006 while ((target_options
& TARGET_WNOHANG
) == 0
3007 && ptid_equal (event_ptid
, null_ptid
)
3008 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3010 /* If at least one stop was reported, there may be more. A single
3011 SIGCHLD can signal more than one child stop. */
3012 if (target_is_async_p ()
3013 && (target_options
& TARGET_WNOHANG
) != 0
3014 && !ptid_equal (event_ptid
, null_ptid
))
3020 /* Send a signal to an LWP. */
3023 kill_lwp (unsigned long lwpid
, int signo
)
3025 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3026 fails, then we are not using nptl threads and we should be using kill. */
3030 static int tkill_failed
;
3037 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3038 if (errno
!= ENOSYS
)
3045 return kill (lwpid
, signo
);
3049 linux_stop_lwp (struct lwp_info
*lwp
)
3055 send_sigstop (struct lwp_info
*lwp
)
3059 pid
= lwpid_of (get_lwp_thread (lwp
));
3061 /* If we already have a pending stop signal for this process, don't
3063 if (lwp
->stop_expected
)
3066 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3072 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3074 lwp
->stop_expected
= 1;
3075 kill_lwp (pid
, SIGSTOP
);
3079 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3081 struct thread_info
*thread
= (struct thread_info
*) entry
;
3082 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3084 /* Ignore EXCEPT. */
3095 /* Increment the suspend count of an LWP, and stop it, if not stopped
3098 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3101 struct thread_info
*thread
= (struct thread_info
*) entry
;
3102 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3104 /* Ignore EXCEPT. */
3110 return send_sigstop_callback (entry
, except
);
3114 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3116 /* It's dead, really. */
3119 /* Store the exit status for later. */
3120 lwp
->status_pending_p
= 1;
3121 lwp
->status_pending
= wstat
;
3123 /* Prevent trying to stop it. */
3126 /* No further stops are expected from a dead lwp. */
3127 lwp
->stop_expected
= 0;
3130 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3133 wait_for_sigstop (void)
3135 struct thread_info
*saved_thread
;
3140 saved_thread
= current_thread
;
3141 if (saved_thread
!= NULL
)
3142 saved_tid
= saved_thread
->entry
.id
;
3144 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3147 debug_printf ("wait_for_sigstop: pulling events\n");
3149 /* Passing NULL_PTID as filter indicates we want all events to be
3150 left pending. Eventually this returns when there are no
3151 unwaited-for children left. */
3152 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3154 gdb_assert (ret
== -1);
3156 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3157 current_thread
= saved_thread
;
3161 debug_printf ("Previously current thread died.\n");
3165 /* We can't change the current inferior behind GDB's back,
3166 otherwise, a subsequent command may apply to the wrong
3168 current_thread
= NULL
;
3172 /* Set a valid thread as current. */
3173 set_desired_thread (0);
3178 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3179 move it out, because we need to report the stop event to GDB. For
3180 example, if the user puts a breakpoint in the jump pad, it's
3181 because she wants to debug it. */
3184 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3186 struct thread_info
*thread
= (struct thread_info
*) entry
;
3187 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3189 gdb_assert (lwp
->suspended
== 0);
3190 gdb_assert (lwp
->stopped
);
3192 /* Allow debugging the jump pad, gdb_collect, etc.. */
3193 return (supports_fast_tracepoints ()
3194 && agent_loaded_p ()
3195 && (gdb_breakpoint_here (lwp
->stop_pc
)
3196 || lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
3197 || thread
->last_resume_kind
== resume_step
)
3198 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3202 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3204 struct thread_info
*thread
= (struct thread_info
*) entry
;
3205 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3208 gdb_assert (lwp
->suspended
== 0);
3209 gdb_assert (lwp
->stopped
);
3211 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3213 /* Allow debugging the jump pad, gdb_collect, etc. */
3214 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3215 && lwp
->stop_reason
!= LWP_STOPPED_BY_WATCHPOINT
3216 && thread
->last_resume_kind
!= resume_step
3217 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3220 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3225 lwp
->status_pending_p
= 0;
3226 enqueue_one_deferred_signal (lwp
, wstat
);
3229 debug_printf ("Signal %d for LWP %ld deferred "
3231 WSTOPSIG (*wstat
), lwpid_of (thread
));
3234 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3241 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3243 struct thread_info
*thread
= (struct thread_info
*) entry
;
3244 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3253 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3254 If SUSPEND, then also increase the suspend count of every LWP,
3258 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3260 /* Should not be called recursively. */
3261 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3266 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3267 suspend
? "stop-and-suspend" : "stop",
3269 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3273 stopping_threads
= (suspend
3274 ? STOPPING_AND_SUSPENDING_THREADS
3275 : STOPPING_THREADS
);
3278 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3280 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3281 wait_for_sigstop ();
3282 stopping_threads
= NOT_STOPPING_THREADS
;
3286 debug_printf ("stop_all_lwps done, setting stopping_threads "
3287 "back to !stopping\n");
3292 /* Resume execution of the inferior process.
3293 If STEP is nonzero, single-step it.
3294 If SIGNAL is nonzero, give it that signal. */
3297 linux_resume_one_lwp (struct lwp_info
*lwp
,
3298 int step
, int signal
, siginfo_t
*info
)
3300 struct thread_info
*thread
= get_lwp_thread (lwp
);
3301 struct thread_info
*saved_thread
;
3302 int fast_tp_collecting
;
3304 if (lwp
->stopped
== 0)
3307 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3309 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3311 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3312 user used the "jump" command, or "set $pc = foo"). */
3313 if (lwp
->stop_pc
!= get_pc (lwp
))
3315 /* Collecting 'while-stepping' actions doesn't make sense
3317 release_while_stepping_state_list (thread
);
3320 /* If we have pending signals or status, and a new signal, enqueue the
3321 signal. Also enqueue the signal if we are waiting to reinsert a
3322 breakpoint; it will be picked up again below. */
3324 && (lwp
->status_pending_p
3325 || lwp
->pending_signals
!= NULL
3326 || lwp
->bp_reinsert
!= 0
3327 || fast_tp_collecting
))
3329 struct pending_signals
*p_sig
;
3330 p_sig
= xmalloc (sizeof (*p_sig
));
3331 p_sig
->prev
= lwp
->pending_signals
;
3332 p_sig
->signal
= signal
;
3334 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3336 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3337 lwp
->pending_signals
= p_sig
;
3340 if (lwp
->status_pending_p
)
3343 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3344 " has pending status\n",
3345 lwpid_of (thread
), step
? "step" : "continue", signal
,
3346 lwp
->stop_expected
? "expected" : "not expected");
3350 saved_thread
= current_thread
;
3351 current_thread
= thread
;
3354 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3355 lwpid_of (thread
), step
? "step" : "continue", signal
,
3356 lwp
->stop_expected
? "expected" : "not expected");
3358 /* This bit needs some thinking about. If we get a signal that
3359 we must report while a single-step reinsert is still pending,
3360 we often end up resuming the thread. It might be better to
3361 (ew) allow a stack of pending events; then we could be sure that
3362 the reinsert happened right away and not lose any signals.
3364 Making this stack would also shrink the window in which breakpoints are
3365 uninserted (see comment in linux_wait_for_lwp) but not enough for
3366 complete correctness, so it won't solve that problem. It may be
3367 worthwhile just to solve this one, however. */
3368 if (lwp
->bp_reinsert
!= 0)
3371 debug_printf (" pending reinsert at 0x%s\n",
3372 paddress (lwp
->bp_reinsert
));
3374 if (can_hardware_single_step ())
3376 if (fast_tp_collecting
== 0)
3379 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3381 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3388 /* Postpone any pending signal. It was enqueued above. */
3392 if (fast_tp_collecting
== 1)
3395 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3396 " (exit-jump-pad-bkpt)\n",
3399 /* Postpone any pending signal. It was enqueued above. */
3402 else if (fast_tp_collecting
== 2)
3405 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3406 " single-stepping\n",
3409 if (can_hardware_single_step ())
3413 internal_error (__FILE__
, __LINE__
,
3414 "moving out of jump pad single-stepping"
3415 " not implemented on this target");
3418 /* Postpone any pending signal. It was enqueued above. */
3422 /* If we have while-stepping actions in this thread set it stepping.
3423 If we have a signal to deliver, it may or may not be set to
3424 SIG_IGN, we don't know. Assume so, and allow collecting
3425 while-stepping into a signal handler. A possible smart thing to
3426 do would be to set an internal breakpoint at the signal return
3427 address, continue, and carry on catching this while-stepping
3428 action only when that breakpoint is hit. A future
3430 if (thread
->while_stepping
!= NULL
3431 && can_hardware_single_step ())
3434 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3439 if (the_low_target
.get_pc
!= NULL
)
3441 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3443 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3447 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3448 (long) lwp
->stop_pc
);
3452 /* If we have pending signals, consume one unless we are trying to
3453 reinsert a breakpoint or we're trying to finish a fast tracepoint
3455 if (lwp
->pending_signals
!= NULL
3456 && lwp
->bp_reinsert
== 0
3457 && fast_tp_collecting
== 0)
3459 struct pending_signals
**p_sig
;
3461 p_sig
= &lwp
->pending_signals
;
3462 while ((*p_sig
)->prev
!= NULL
)
3463 p_sig
= &(*p_sig
)->prev
;
3465 signal
= (*p_sig
)->signal
;
3466 if ((*p_sig
)->info
.si_signo
!= 0)
3467 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3474 if (the_low_target
.prepare_to_resume
!= NULL
)
3475 the_low_target
.prepare_to_resume (lwp
);
3477 regcache_invalidate_thread (thread
);
3480 lwp
->stop_reason
= LWP_STOPPED_BY_NO_REASON
;
3481 lwp
->stepping
= step
;
3482 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3483 (PTRACE_TYPE_ARG3
) 0,
3484 /* Coerce to a uintptr_t first to avoid potential gcc warning
3485 of coercing an 8 byte integer to a 4 byte pointer. */
3486 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3488 current_thread
= saved_thread
;
3491 /* ESRCH from ptrace either means that the thread was already
3492 running (an error) or that it is gone (a race condition). If
3493 it's gone, we will get a notification the next time we wait,
3494 so we can ignore the error. We could differentiate these
3495 two, but it's tricky without waiting; the thread still exists
3496 as a zombie, so sending it signal 0 would succeed. So just
3501 perror_with_name ("ptrace");
3505 struct thread_resume_array
3507 struct thread_resume
*resume
;
3511 /* This function is called once per thread via find_inferior.
3512 ARG is a pointer to a thread_resume_array struct.
3513 We look up the thread specified by ENTRY in ARG, and mark the thread
3514 with a pointer to the appropriate resume request.
3516 This algorithm is O(threads * resume elements), but resume elements
3517 is small (and will remain small at least until GDB supports thread
3521 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3523 struct thread_info
*thread
= (struct thread_info
*) entry
;
3524 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3526 struct thread_resume_array
*r
;
3530 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3532 ptid_t ptid
= r
->resume
[ndx
].thread
;
3533 if (ptid_equal (ptid
, minus_one_ptid
)
3534 || ptid_equal (ptid
, entry
->id
)
3535 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3537 || (ptid_get_pid (ptid
) == pid_of (thread
)
3538 && (ptid_is_pid (ptid
)
3539 || ptid_get_lwp (ptid
) == -1)))
3541 if (r
->resume
[ndx
].kind
== resume_stop
3542 && thread
->last_resume_kind
== resume_stop
)
3545 debug_printf ("already %s LWP %ld at GDB's request\n",
3546 (thread
->last_status
.kind
3547 == TARGET_WAITKIND_STOPPED
)
3555 lwp
->resume
= &r
->resume
[ndx
];
3556 thread
->last_resume_kind
= lwp
->resume
->kind
;
3558 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3559 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3561 /* If we had a deferred signal to report, dequeue one now.
3562 This can happen if LWP gets more than one signal while
3563 trying to get out of a jump pad. */
3565 && !lwp
->status_pending_p
3566 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3568 lwp
->status_pending_p
= 1;
3571 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3572 "leaving status pending.\n",
3573 WSTOPSIG (lwp
->status_pending
),
3581 /* No resume action for this thread. */
3587 /* find_inferior callback for linux_resume.
3588 Set *FLAG_P if this lwp has an interesting status pending. */
3591 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3593 struct thread_info
*thread
= (struct thread_info
*) entry
;
3594 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3596 /* LWPs which will not be resumed are not interesting, because
3597 we might not wait for them next time through linux_wait. */
3598 if (lwp
->resume
== NULL
)
3601 if (thread_still_has_status_pending_p (thread
))
3602 * (int *) flag_p
= 1;
3607 /* Return 1 if this lwp that GDB wants running is stopped at an
3608 internal breakpoint that we need to step over. It assumes that any
3609 required STOP_PC adjustment has already been propagated to the
3610 inferior's regcache. */
3613 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3615 struct thread_info
*thread
= (struct thread_info
*) entry
;
3616 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3617 struct thread_info
*saved_thread
;
3620 /* LWPs which will not be resumed are not interesting, because we
3621 might not wait for them next time through linux_wait. */
3626 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3631 if (thread
->last_resume_kind
== resume_stop
)
3634 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3640 gdb_assert (lwp
->suspended
>= 0);
3645 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3650 if (!lwp
->need_step_over
)
3653 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
3656 if (lwp
->status_pending_p
)
3659 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3665 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3669 /* If the PC has changed since we stopped, then don't do anything,
3670 and let the breakpoint/tracepoint be hit. This happens if, for
3671 instance, GDB handled the decr_pc_after_break subtraction itself,
3672 GDB is OOL stepping this thread, or the user has issued a "jump"
3673 command, or poked thread's registers herself. */
3674 if (pc
!= lwp
->stop_pc
)
3677 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3678 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3680 paddress (lwp
->stop_pc
), paddress (pc
));
3682 lwp
->need_step_over
= 0;
3686 saved_thread
= current_thread
;
3687 current_thread
= thread
;
3689 /* We can only step over breakpoints we know about. */
3690 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3692 /* Don't step over a breakpoint that GDB expects to hit
3693 though. If the condition is being evaluated on the target's side
3694 and it evaluate to false, step over this breakpoint as well. */
3695 if (gdb_breakpoint_here (pc
)
3696 && gdb_condition_true_at_breakpoint (pc
)
3697 && gdb_no_commands_at_breakpoint (pc
))
3700 debug_printf ("Need step over [LWP %ld]? yes, but found"
3701 " GDB breakpoint at 0x%s; skipping step over\n",
3702 lwpid_of (thread
), paddress (pc
));
3704 current_thread
= saved_thread
;
3710 debug_printf ("Need step over [LWP %ld]? yes, "
3711 "found breakpoint at 0x%s\n",
3712 lwpid_of (thread
), paddress (pc
));
3714 /* We've found an lwp that needs stepping over --- return 1 so
3715 that find_inferior stops looking. */
3716 current_thread
= saved_thread
;
3718 /* If the step over is cancelled, this is set again. */
3719 lwp
->need_step_over
= 0;
3724 current_thread
= saved_thread
;
3727 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3729 lwpid_of (thread
), paddress (pc
));
3734 /* Start a step-over operation on LWP. When LWP stopped at a
3735 breakpoint, to make progress, we need to remove the breakpoint out
3736 of the way. If we let other threads run while we do that, they may
3737 pass by the breakpoint location and miss hitting it. To avoid
3738 that, a step-over momentarily stops all threads while LWP is
3739 single-stepped while the breakpoint is temporarily uninserted from
3740 the inferior. When the single-step finishes, we reinsert the
3741 breakpoint, and let all threads that are supposed to be running,
3744 On targets that don't support hardware single-step, we don't
3745 currently support full software single-stepping. Instead, we only
3746 support stepping over the thread event breakpoint, by asking the
3747 low target where to place a reinsert breakpoint. Since this
3748 routine assumes the breakpoint being stepped over is a thread event
3749 breakpoint, it usually assumes the return address of the current
3750 function is a good enough place to set the reinsert breakpoint. */
3753 start_step_over (struct lwp_info
*lwp
)
3755 struct thread_info
*thread
= get_lwp_thread (lwp
);
3756 struct thread_info
*saved_thread
;
3761 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3764 stop_all_lwps (1, lwp
);
3765 gdb_assert (lwp
->suspended
== 0);
3768 debug_printf ("Done stopping all threads for step-over.\n");
3770 /* Note, we should always reach here with an already adjusted PC,
3771 either by GDB (if we're resuming due to GDB's request), or by our
3772 caller, if we just finished handling an internal breakpoint GDB
3773 shouldn't care about. */
3776 saved_thread
= current_thread
;
3777 current_thread
= thread
;
3779 lwp
->bp_reinsert
= pc
;
3780 uninsert_breakpoints_at (pc
);
3781 uninsert_fast_tracepoint_jumps_at (pc
);
3783 if (can_hardware_single_step ())
3789 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3790 set_reinsert_breakpoint (raddr
);
3794 current_thread
= saved_thread
;
3796 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3798 /* Require next event from this LWP. */
3799 step_over_bkpt
= thread
->entry
.id
;
3803 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3804 start_step_over, if still there, and delete any reinsert
3805 breakpoints we've set, on non hardware single-step targets. */
3808 finish_step_over (struct lwp_info
*lwp
)
3810 if (lwp
->bp_reinsert
!= 0)
3813 debug_printf ("Finished step over.\n");
3815 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3816 may be no breakpoint to reinsert there by now. */
3817 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3818 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3820 lwp
->bp_reinsert
= 0;
3822 /* Delete any software-single-step reinsert breakpoints. No
3823 longer needed. We don't have to worry about other threads
3824 hitting this trap, and later not being able to explain it,
3825 because we were stepping over a breakpoint, and we hold all
3826 threads but LWP stopped while doing that. */
3827 if (!can_hardware_single_step ())
3828 delete_reinsert_breakpoints ();
3830 step_over_bkpt
= null_ptid
;
3837 /* This function is called once per thread. We check the thread's resume
3838 request, which will tell us whether to resume, step, or leave the thread
3839 stopped; and what signal, if any, it should be sent.
3841 For threads which we aren't explicitly told otherwise, we preserve
3842 the stepping flag; this is used for stepping over gdbserver-placed
3845 If pending_flags was set in any thread, we queue any needed
3846 signals, since we won't actually resume. We already have a pending
3847 event to report, so we don't need to preserve any step requests;
3848 they should be re-issued if necessary. */
3851 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3853 struct thread_info
*thread
= (struct thread_info
*) entry
;
3854 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3856 int leave_all_stopped
= * (int *) arg
;
3859 if (lwp
->resume
== NULL
)
3862 if (lwp
->resume
->kind
== resume_stop
)
3865 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
3870 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
3872 /* Stop the thread, and wait for the event asynchronously,
3873 through the event loop. */
3879 debug_printf ("already stopped LWP %ld\n",
3882 /* The LWP may have been stopped in an internal event that
3883 was not meant to be notified back to GDB (e.g., gdbserver
3884 breakpoint), so we should be reporting a stop event in
3887 /* If the thread already has a pending SIGSTOP, this is a
3888 no-op. Otherwise, something later will presumably resume
3889 the thread and this will cause it to cancel any pending
3890 operation, due to last_resume_kind == resume_stop. If
3891 the thread already has a pending status to report, we
3892 will still report it the next time we wait - see
3893 status_pending_p_callback. */
3895 /* If we already have a pending signal to report, then
3896 there's no need to queue a SIGSTOP, as this means we're
3897 midway through moving the LWP out of the jumppad, and we
3898 will report the pending signal as soon as that is
3900 if (lwp
->pending_signals_to_report
== NULL
)
3904 /* For stop requests, we're done. */
3906 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3910 /* If this thread which is about to be resumed has a pending status,
3911 then don't resume any threads - we can just report the pending
3912 status. Make sure to queue any signals that would otherwise be
3913 sent. In all-stop mode, we do this decision based on if *any*
3914 thread has a pending status. If there's a thread that needs the
3915 step-over-breakpoint dance, then don't resume any other thread
3916 but that particular one. */
3917 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3922 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
3924 step
= (lwp
->resume
->kind
== resume_step
);
3925 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3930 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
3932 /* If we have a new signal, enqueue the signal. */
3933 if (lwp
->resume
->sig
!= 0)
3935 struct pending_signals
*p_sig
;
3936 p_sig
= xmalloc (sizeof (*p_sig
));
3937 p_sig
->prev
= lwp
->pending_signals
;
3938 p_sig
->signal
= lwp
->resume
->sig
;
3939 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3941 /* If this is the same signal we were previously stopped by,
3942 make sure to queue its siginfo. We can ignore the return
3943 value of ptrace; if it fails, we'll skip
3944 PTRACE_SETSIGINFO. */
3945 if (WIFSTOPPED (lwp
->last_status
)
3946 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3947 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3950 lwp
->pending_signals
= p_sig
;
3954 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3960 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3962 struct thread_resume_array array
= { resume_info
, n
};
3963 struct thread_info
*need_step_over
= NULL
;
3965 int leave_all_stopped
;
3970 debug_printf ("linux_resume:\n");
3973 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3975 /* If there is a thread which would otherwise be resumed, which has
3976 a pending status, then don't resume any threads - we can just
3977 report the pending status. Make sure to queue any signals that
3978 would otherwise be sent. In non-stop mode, we'll apply this
3979 logic to each thread individually. We consume all pending events
3980 before considering to start a step-over (in all-stop). */
3983 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
3985 /* If there is a thread which would otherwise be resumed, which is
3986 stopped at a breakpoint that needs stepping over, then don't
3987 resume any threads - have it step over the breakpoint with all
3988 other threads stopped, then resume all threads again. Make sure
3989 to queue any signals that would otherwise be delivered or
3991 if (!any_pending
&& supports_breakpoints ())
3993 = (struct thread_info
*) find_inferior (&all_threads
,
3994 need_step_over_p
, NULL
);
3996 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4000 if (need_step_over
!= NULL
)
4001 debug_printf ("Not resuming all, need step over\n");
4002 else if (any_pending
)
4003 debug_printf ("Not resuming, all-stop and found "
4004 "an LWP with pending status\n");
4006 debug_printf ("Resuming, no pending status or step over needed\n");
4009 /* Even if we're leaving threads stopped, queue all signals we'd
4010 otherwise deliver. */
4011 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4014 start_step_over (get_thread_lwp (need_step_over
));
4018 debug_printf ("linux_resume done\n");
4023 /* This function is called once per thread. We check the thread's
4024 last resume request, which will tell us whether to resume, step, or
4025 leave the thread stopped. Any signal the client requested to be
4026 delivered has already been enqueued at this point.
4028 If any thread that GDB wants running is stopped at an internal
4029 breakpoint that needs stepping over, we start a step-over operation
4030 on that particular thread, and leave all others stopped. */
4033 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4035 struct thread_info
*thread
= (struct thread_info
*) entry
;
4036 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4043 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4048 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4052 if (thread
->last_resume_kind
== resume_stop
4053 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4056 debug_printf (" client wants LWP to remain %ld stopped\n",
4061 if (lwp
->status_pending_p
)
4064 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4069 gdb_assert (lwp
->suspended
>= 0);
4074 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4078 if (thread
->last_resume_kind
== resume_stop
4079 && lwp
->pending_signals_to_report
== NULL
4080 && lwp
->collecting_fast_tracepoint
== 0)
4082 /* We haven't reported this LWP as stopped yet (otherwise, the
4083 last_status.kind check above would catch it, and we wouldn't
4084 reach here. This LWP may have been momentarily paused by a
4085 stop_all_lwps call while handling for example, another LWP's
4086 step-over. In that case, the pending expected SIGSTOP signal
4087 that was queued at vCont;t handling time will have already
4088 been consumed by wait_for_sigstop, and so we need to requeue
4089 another one here. Note that if the LWP already has a SIGSTOP
4090 pending, this is a no-op. */
4093 debug_printf ("Client wants LWP %ld to stop. "
4094 "Making sure it has a SIGSTOP pending\n",
4100 step
= thread
->last_resume_kind
== resume_step
;
4101 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4106 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4108 struct thread_info
*thread
= (struct thread_info
*) entry
;
4109 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4115 gdb_assert (lwp
->suspended
>= 0);
4117 return proceed_one_lwp (entry
, except
);
4120 /* When we finish a step-over, set threads running again. If there's
4121 another thread that may need a step-over, now's the time to start
4122 it. Eventually, we'll move all threads past their breakpoints. */
4125 proceed_all_lwps (void)
4127 struct thread_info
*need_step_over
;
4129 /* If there is a thread which would otherwise be resumed, which is
4130 stopped at a breakpoint that needs stepping over, then don't
4131 resume any threads - have it step over the breakpoint with all
4132 other threads stopped, then resume all threads again. */
4134 if (supports_breakpoints ())
4137 = (struct thread_info
*) find_inferior (&all_threads
,
4138 need_step_over_p
, NULL
);
4140 if (need_step_over
!= NULL
)
4143 debug_printf ("proceed_all_lwps: found "
4144 "thread %ld needing a step-over\n",
4145 lwpid_of (need_step_over
));
4147 start_step_over (get_thread_lwp (need_step_over
));
4153 debug_printf ("Proceeding, no step-over needed\n");
4155 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4158 /* Stopped LWPs that the client wanted to be running, that don't have
4159 pending statuses, are set to run again, except for EXCEPT, if not
4160 NULL. This undoes a stop_all_lwps call. */
4163 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4169 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4170 lwpid_of (get_lwp_thread (except
)));
4172 debug_printf ("unstopping all lwps\n");
4176 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4178 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4182 debug_printf ("unstop_all_lwps done\n");
4188 #ifdef HAVE_LINUX_REGSETS
4190 #define use_linux_regsets 1
4192 /* Returns true if REGSET has been disabled. */
4195 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4197 return (info
->disabled_regsets
!= NULL
4198 && info
->disabled_regsets
[regset
- info
->regsets
]);
4201 /* Disable REGSET. */
4204 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4208 dr_offset
= regset
- info
->regsets
;
4209 if (info
->disabled_regsets
== NULL
)
4210 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4211 info
->disabled_regsets
[dr_offset
] = 1;
4215 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4216 struct regcache
*regcache
)
4218 struct regset_info
*regset
;
4219 int saw_general_regs
= 0;
4223 pid
= lwpid_of (current_thread
);
4224 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4229 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4232 buf
= xmalloc (regset
->size
);
4234 nt_type
= regset
->nt_type
;
4238 iov
.iov_len
= regset
->size
;
4239 data
= (void *) &iov
;
4245 res
= ptrace (regset
->get_request
, pid
,
4246 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4248 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4254 /* If we get EIO on a regset, do not try it again for
4255 this process mode. */
4256 disable_regset (regsets_info
, regset
);
4258 else if (errno
== ENODATA
)
4260 /* ENODATA may be returned if the regset is currently
4261 not "active". This can happen in normal operation,
4262 so suppress the warning in this case. */
4267 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4274 if (regset
->type
== GENERAL_REGS
)
4275 saw_general_regs
= 1;
4276 regset
->store_function (regcache
, buf
);
4280 if (saw_general_regs
)
4287 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4288 struct regcache
*regcache
)
4290 struct regset_info
*regset
;
4291 int saw_general_regs
= 0;
4295 pid
= lwpid_of (current_thread
);
4296 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4301 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4302 || regset
->fill_function
== NULL
)
4305 buf
= xmalloc (regset
->size
);
4307 /* First fill the buffer with the current register set contents,
4308 in case there are any items in the kernel's regset that are
4309 not in gdbserver's regcache. */
4311 nt_type
= regset
->nt_type
;
4315 iov
.iov_len
= regset
->size
;
4316 data
= (void *) &iov
;
4322 res
= ptrace (regset
->get_request
, pid
,
4323 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4325 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4330 /* Then overlay our cached registers on that. */
4331 regset
->fill_function (regcache
, buf
);
4333 /* Only now do we write the register set. */
4335 res
= ptrace (regset
->set_request
, pid
,
4336 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4338 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4346 /* If we get EIO on a regset, do not try it again for
4347 this process mode. */
4348 disable_regset (regsets_info
, regset
);
4350 else if (errno
== ESRCH
)
4352 /* At this point, ESRCH should mean the process is
4353 already gone, in which case we simply ignore attempts
4354 to change its registers. See also the related
4355 comment in linux_resume_one_lwp. */
4361 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4364 else if (regset
->type
== GENERAL_REGS
)
4365 saw_general_regs
= 1;
4368 if (saw_general_regs
)
4374 #else /* !HAVE_LINUX_REGSETS */
4376 #define use_linux_regsets 0
4377 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4378 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4382 /* Return 1 if register REGNO is supported by one of the regset ptrace
4383 calls or 0 if it has to be transferred individually. */
4386 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4388 unsigned char mask
= 1 << (regno
% 8);
4389 size_t index
= regno
/ 8;
4391 return (use_linux_regsets
4392 && (regs_info
->regset_bitmap
== NULL
4393 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4396 #ifdef HAVE_LINUX_USRREGS
4399 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4403 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4404 error ("Invalid register number %d.", regnum
);
4406 addr
= usrregs
->regmap
[regnum
];
4411 /* Fetch one register. */
4413 fetch_register (const struct usrregs_info
*usrregs
,
4414 struct regcache
*regcache
, int regno
)
4421 if (regno
>= usrregs
->num_regs
)
4423 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4426 regaddr
= register_addr (usrregs
, regno
);
4430 size
= ((register_size (regcache
->tdesc
, regno
)
4431 + sizeof (PTRACE_XFER_TYPE
) - 1)
4432 & -sizeof (PTRACE_XFER_TYPE
));
4433 buf
= alloca (size
);
4435 pid
= lwpid_of (current_thread
);
4436 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4439 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4440 ptrace (PTRACE_PEEKUSER
, pid
,
4441 /* Coerce to a uintptr_t first to avoid potential gcc warning
4442 of coercing an 8 byte integer to a 4 byte pointer. */
4443 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4444 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4446 error ("reading register %d: %s", regno
, strerror (errno
));
4449 if (the_low_target
.supply_ptrace_register
)
4450 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4452 supply_register (regcache
, regno
, buf
);
4455 /* Store one register. */
4457 store_register (const struct usrregs_info
*usrregs
,
4458 struct regcache
*regcache
, int regno
)
4465 if (regno
>= usrregs
->num_regs
)
4467 if ((*the_low_target
.cannot_store_register
) (regno
))
4470 regaddr
= register_addr (usrregs
, regno
);
4474 size
= ((register_size (regcache
->tdesc
, regno
)
4475 + sizeof (PTRACE_XFER_TYPE
) - 1)
4476 & -sizeof (PTRACE_XFER_TYPE
));
4477 buf
= alloca (size
);
4478 memset (buf
, 0, size
);
4480 if (the_low_target
.collect_ptrace_register
)
4481 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4483 collect_register (regcache
, regno
, buf
);
4485 pid
= lwpid_of (current_thread
);
4486 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4489 ptrace (PTRACE_POKEUSER
, pid
,
4490 /* Coerce to a uintptr_t first to avoid potential gcc warning
4491 about coercing an 8 byte integer to a 4 byte pointer. */
4492 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4493 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4496 /* At this point, ESRCH should mean the process is
4497 already gone, in which case we simply ignore attempts
4498 to change its registers. See also the related
4499 comment in linux_resume_one_lwp. */
4503 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4504 error ("writing register %d: %s", regno
, strerror (errno
));
4506 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4510 /* Fetch all registers, or just one, from the child process.
4511 If REGNO is -1, do this for all registers, skipping any that are
4512 assumed to have been retrieved by regsets_fetch_inferior_registers,
4513 unless ALL is non-zero.
4514 Otherwise, REGNO specifies which register (so we can save time). */
4516 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4517 struct regcache
*regcache
, int regno
, int all
)
4519 struct usrregs_info
*usr
= regs_info
->usrregs
;
4523 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4524 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4525 fetch_register (usr
, regcache
, regno
);
4528 fetch_register (usr
, regcache
, regno
);
4531 /* Store our register values back into the inferior.
4532 If REGNO is -1, do this for all registers, skipping any that are
4533 assumed to have been saved by regsets_store_inferior_registers,
4534 unless ALL is non-zero.
4535 Otherwise, REGNO specifies which register (so we can save time). */
4537 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4538 struct regcache
*regcache
, int regno
, int all
)
4540 struct usrregs_info
*usr
= regs_info
->usrregs
;
4544 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4545 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4546 store_register (usr
, regcache
, regno
);
4549 store_register (usr
, regcache
, regno
);
4552 #else /* !HAVE_LINUX_USRREGS */
4554 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4555 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4561 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4565 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4569 if (the_low_target
.fetch_register
!= NULL
4570 && regs_info
->usrregs
!= NULL
)
4571 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4572 (*the_low_target
.fetch_register
) (regcache
, regno
);
4574 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4575 if (regs_info
->usrregs
!= NULL
)
4576 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4580 if (the_low_target
.fetch_register
!= NULL
4581 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4584 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4586 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4588 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4589 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4594 linux_store_registers (struct regcache
*regcache
, int regno
)
4598 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4602 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4604 if (regs_info
->usrregs
!= NULL
)
4605 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4609 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4611 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4613 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4614 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4619 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4620 to debugger memory starting at MYADDR. */
4623 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4625 int pid
= lwpid_of (current_thread
);
4626 register PTRACE_XFER_TYPE
*buffer
;
4627 register CORE_ADDR addr
;
4634 /* Try using /proc. Don't bother for one word. */
4635 if (len
>= 3 * sizeof (long))
4639 /* We could keep this file open and cache it - possibly one per
4640 thread. That requires some juggling, but is even faster. */
4641 sprintf (filename
, "/proc/%d/mem", pid
);
4642 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4646 /* If pread64 is available, use it. It's faster if the kernel
4647 supports it (only one syscall), and it's 64-bit safe even on
4648 32-bit platforms (for instance, SPARC debugging a SPARC64
4651 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4654 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4655 bytes
= read (fd
, myaddr
, len
);
4662 /* Some data was read, we'll try to get the rest with ptrace. */
4672 /* Round starting address down to longword boundary. */
4673 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4674 /* Round ending address up; get number of longwords that makes. */
4675 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4676 / sizeof (PTRACE_XFER_TYPE
));
4677 /* Allocate buffer of that many longwords. */
4678 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4680 /* Read all the longwords */
4682 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4684 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4685 about coercing an 8 byte integer to a 4 byte pointer. */
4686 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4687 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4688 (PTRACE_TYPE_ARG4
) 0);
4694 /* Copy appropriate bytes out of the buffer. */
4697 i
*= sizeof (PTRACE_XFER_TYPE
);
4698 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4700 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4707 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4708 memory at MEMADDR. On failure (cannot write to the inferior)
4709 returns the value of errno. Always succeeds if LEN is zero. */
4712 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4715 /* Round starting address down to longword boundary. */
4716 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4717 /* Round ending address up; get number of longwords that makes. */
4719 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4720 / sizeof (PTRACE_XFER_TYPE
);
4722 /* Allocate buffer of that many longwords. */
4723 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4724 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4726 int pid
= lwpid_of (current_thread
);
4730 /* Zero length write always succeeds. */
4736 /* Dump up to four bytes. */
4737 unsigned int val
= * (unsigned int *) myaddr
;
4743 val
= val
& 0xffffff;
4744 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4745 val
, (long)memaddr
);
4748 /* Fill start and end extra bytes of buffer with existing memory data. */
4751 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4752 about coercing an 8 byte integer to a 4 byte pointer. */
4753 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4754 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4755 (PTRACE_TYPE_ARG4
) 0);
4763 = ptrace (PTRACE_PEEKTEXT
, pid
,
4764 /* Coerce to a uintptr_t first to avoid potential gcc warning
4765 about coercing an 8 byte integer to a 4 byte pointer. */
4766 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4767 * sizeof (PTRACE_XFER_TYPE
)),
4768 (PTRACE_TYPE_ARG4
) 0);
4773 /* Copy data to be written over corresponding part of buffer. */
4775 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4778 /* Write the entire buffer. */
4780 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4783 ptrace (PTRACE_POKETEXT
, pid
,
4784 /* Coerce to a uintptr_t first to avoid potential gcc warning
4785 about coercing an 8 byte integer to a 4 byte pointer. */
4786 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4787 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4796 linux_look_up_symbols (void)
4798 #ifdef USE_THREAD_DB
4799 struct process_info
*proc
= current_process ();
4801 if (proc
->private->thread_db
!= NULL
)
4804 /* If the kernel supports tracing clones, then we don't need to
4805 use the magic thread event breakpoint to learn about
4807 thread_db_init (!linux_supports_traceclone ());
4812 linux_request_interrupt (void)
4814 extern unsigned long signal_pid
;
4816 /* Send a SIGINT to the process group. This acts just like the user
4817 typed a ^C on the controlling terminal. */
4818 kill (-signal_pid
, SIGINT
);
4821 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4822 to debugger memory starting at MYADDR. */
4825 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4827 char filename
[PATH_MAX
];
4829 int pid
= lwpid_of (current_thread
);
4831 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4833 fd
= open (filename
, O_RDONLY
);
4837 if (offset
!= (CORE_ADDR
) 0
4838 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4841 n
= read (fd
, myaddr
, len
);
4848 /* These breakpoint and watchpoint related wrapper functions simply
4849 pass on the function call if the target has registered a
4850 corresponding function. */
4853 linux_supports_z_point_type (char z_type
)
4855 return (the_low_target
.supports_z_point_type
!= NULL
4856 && the_low_target
.supports_z_point_type (z_type
));
4860 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4861 int size
, struct raw_breakpoint
*bp
)
4863 if (the_low_target
.insert_point
!= NULL
)
4864 return the_low_target
.insert_point (type
, addr
, size
, bp
);
4866 /* Unsupported (see target.h). */
4871 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
4872 int size
, struct raw_breakpoint
*bp
)
4874 if (the_low_target
.remove_point
!= NULL
)
4875 return the_low_target
.remove_point (type
, addr
, size
, bp
);
4877 /* Unsupported (see target.h). */
4882 linux_stopped_by_watchpoint (void)
4884 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4886 return lwp
->stop_reason
== LWP_STOPPED_BY_WATCHPOINT
;
4890 linux_stopped_data_address (void)
4892 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
4894 return lwp
->stopped_data_address
;
4897 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4898 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4899 && defined(PT_TEXT_END_ADDR)
4901 /* This is only used for targets that define PT_TEXT_ADDR,
4902 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4903 the target has different ways of acquiring this information, like
4906 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4907 to tell gdb about. */
4910 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4912 unsigned long text
, text_end
, data
;
4913 int pid
= lwpid_of (get_thread_lwp (current_thread
));
4917 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4918 (PTRACE_TYPE_ARG4
) 0);
4919 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4920 (PTRACE_TYPE_ARG4
) 0);
4921 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4922 (PTRACE_TYPE_ARG4
) 0);
4926 /* Both text and data offsets produced at compile-time (and so
4927 used by gdb) are relative to the beginning of the program,
4928 with the data segment immediately following the text segment.
4929 However, the actual runtime layout in memory may put the data
4930 somewhere else, so when we send gdb a data base-address, we
4931 use the real data base address and subtract the compile-time
4932 data base-address from it (which is just the length of the
4933 text segment). BSS immediately follows data in both
4936 *data_p
= data
- (text_end
- text
);
4945 linux_qxfer_osdata (const char *annex
,
4946 unsigned char *readbuf
, unsigned const char *writebuf
,
4947 CORE_ADDR offset
, int len
)
4949 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4952 /* Convert a native/host siginfo object, into/from the siginfo in the
4953 layout of the inferiors' architecture. */
4956 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4960 if (the_low_target
.siginfo_fixup
!= NULL
)
4961 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4963 /* If there was no callback, or the callback didn't do anything,
4964 then just do a straight memcpy. */
4968 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4970 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4975 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4976 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4980 char inf_siginfo
[sizeof (siginfo_t
)];
4982 if (current_thread
== NULL
)
4985 pid
= lwpid_of (current_thread
);
4988 debug_printf ("%s siginfo for lwp %d.\n",
4989 readbuf
!= NULL
? "Reading" : "Writing",
4992 if (offset
>= sizeof (siginfo
))
4995 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4998 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4999 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5000 inferior with a 64-bit GDBSERVER should look the same as debugging it
5001 with a 32-bit GDBSERVER, we need to convert it. */
5002 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5004 if (offset
+ len
> sizeof (siginfo
))
5005 len
= sizeof (siginfo
) - offset
;
5007 if (readbuf
!= NULL
)
5008 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5011 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5013 /* Convert back to ptrace layout before flushing it out. */
5014 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5016 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5023 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5024 so we notice when children change state; as the handler for the
5025 sigsuspend in my_waitpid. */
5028 sigchld_handler (int signo
)
5030 int old_errno
= errno
;
5036 /* fprintf is not async-signal-safe, so call write
5038 if (write (2, "sigchld_handler\n",
5039 sizeof ("sigchld_handler\n") - 1) < 0)
5040 break; /* just ignore */
5044 if (target_is_async_p ())
5045 async_file_mark (); /* trigger a linux_wait */
5051 linux_supports_non_stop (void)
5057 linux_async (int enable
)
5059 int previous
= target_is_async_p ();
5062 debug_printf ("linux_async (%d), previous=%d\n",
5065 if (previous
!= enable
)
5068 sigemptyset (&mask
);
5069 sigaddset (&mask
, SIGCHLD
);
5071 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5075 if (pipe (linux_event_pipe
) == -1)
5077 linux_event_pipe
[0] = -1;
5078 linux_event_pipe
[1] = -1;
5079 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5081 warning ("creating event pipe failed.");
5085 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5086 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5088 /* Register the event loop handler. */
5089 add_file_handler (linux_event_pipe
[0],
5090 handle_target_event
, NULL
);
5092 /* Always trigger a linux_wait. */
5097 delete_file_handler (linux_event_pipe
[0]);
5099 close (linux_event_pipe
[0]);
5100 close (linux_event_pipe
[1]);
5101 linux_event_pipe
[0] = -1;
5102 linux_event_pipe
[1] = -1;
5105 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5112 linux_start_non_stop (int nonstop
)
5114 /* Register or unregister from event-loop accordingly. */
5115 linux_async (nonstop
);
5117 if (target_is_async_p () != (nonstop
!= 0))
5124 linux_supports_multi_process (void)
5130 linux_supports_disable_randomization (void)
5132 #ifdef HAVE_PERSONALITY
5140 linux_supports_agent (void)
5146 linux_supports_range_stepping (void)
5148 if (*the_low_target
.supports_range_stepping
== NULL
)
5151 return (*the_low_target
.supports_range_stepping
) ();
5154 /* Enumerate spufs IDs for process PID. */
5156 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5162 struct dirent
*entry
;
5164 sprintf (path
, "/proc/%ld/fd", pid
);
5165 dir
= opendir (path
);
5170 while ((entry
= readdir (dir
)) != NULL
)
5176 fd
= atoi (entry
->d_name
);
5180 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5181 if (stat (path
, &st
) != 0)
5183 if (!S_ISDIR (st
.st_mode
))
5186 if (statfs (path
, &stfs
) != 0)
5188 if (stfs
.f_type
!= SPUFS_MAGIC
)
5191 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5193 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5203 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5204 object type, using the /proc file system. */
5206 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5207 unsigned const char *writebuf
,
5208 CORE_ADDR offset
, int len
)
5210 long pid
= lwpid_of (current_thread
);
5215 if (!writebuf
&& !readbuf
)
5223 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5226 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5227 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5232 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5239 ret
= write (fd
, writebuf
, (size_t) len
);
5241 ret
= read (fd
, readbuf
, (size_t) len
);
5247 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5248 struct target_loadseg
5250 /* Core address to which the segment is mapped. */
5252 /* VMA recorded in the program header. */
5254 /* Size of this segment in memory. */
5258 # if defined PT_GETDSBT
5259 struct target_loadmap
5261 /* Protocol version number, must be zero. */
5263 /* Pointer to the DSBT table, its size, and the DSBT index. */
5264 unsigned *dsbt_table
;
5265 unsigned dsbt_size
, dsbt_index
;
5266 /* Number of segments in this map. */
5268 /* The actual memory map. */
5269 struct target_loadseg segs
[/*nsegs*/];
5271 # define LINUX_LOADMAP PT_GETDSBT
5272 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5273 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5275 struct target_loadmap
5277 /* Protocol version number, must be zero. */
5279 /* Number of segments in this map. */
5281 /* The actual memory map. */
5282 struct target_loadseg segs
[/*nsegs*/];
5284 # define LINUX_LOADMAP PTRACE_GETFDPIC
5285 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5286 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5290 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5291 unsigned char *myaddr
, unsigned int len
)
5293 int pid
= lwpid_of (current_thread
);
5295 struct target_loadmap
*data
= NULL
;
5296 unsigned int actual_length
, copy_length
;
5298 if (strcmp (annex
, "exec") == 0)
5299 addr
= (int) LINUX_LOADMAP_EXEC
;
5300 else if (strcmp (annex
, "interp") == 0)
5301 addr
= (int) LINUX_LOADMAP_INTERP
;
5305 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5311 actual_length
= sizeof (struct target_loadmap
)
5312 + sizeof (struct target_loadseg
) * data
->nsegs
;
5314 if (offset
< 0 || offset
> actual_length
)
5317 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5318 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5322 # define linux_read_loadmap NULL
5323 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5326 linux_process_qsupported (const char *query
)
5328 if (the_low_target
.process_qsupported
!= NULL
)
5329 the_low_target
.process_qsupported (query
);
5333 linux_supports_tracepoints (void)
5335 if (*the_low_target
.supports_tracepoints
== NULL
)
5338 return (*the_low_target
.supports_tracepoints
) ();
5342 linux_read_pc (struct regcache
*regcache
)
5344 if (the_low_target
.get_pc
== NULL
)
5347 return (*the_low_target
.get_pc
) (regcache
);
5351 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5353 gdb_assert (the_low_target
.set_pc
!= NULL
);
5355 (*the_low_target
.set_pc
) (regcache
, pc
);
5359 linux_thread_stopped (struct thread_info
*thread
)
5361 return get_thread_lwp (thread
)->stopped
;
5364 /* This exposes stop-all-threads functionality to other modules. */
5367 linux_pause_all (int freeze
)
5369 stop_all_lwps (freeze
, NULL
);
5372 /* This exposes unstop-all-threads functionality to other gdbserver
5376 linux_unpause_all (int unfreeze
)
5378 unstop_all_lwps (unfreeze
, NULL
);
5382 linux_prepare_to_access_memory (void)
5384 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5387 linux_pause_all (1);
5392 linux_done_accessing_memory (void)
5394 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5397 linux_unpause_all (1);
5401 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5402 CORE_ADDR collector
,
5405 CORE_ADDR
*jump_entry
,
5406 CORE_ADDR
*trampoline
,
5407 ULONGEST
*trampoline_size
,
5408 unsigned char *jjump_pad_insn
,
5409 ULONGEST
*jjump_pad_insn_size
,
5410 CORE_ADDR
*adjusted_insn_addr
,
5411 CORE_ADDR
*adjusted_insn_addr_end
,
5414 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5415 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5416 jump_entry
, trampoline
, trampoline_size
,
5417 jjump_pad_insn
, jjump_pad_insn_size
,
5418 adjusted_insn_addr
, adjusted_insn_addr_end
,
5422 static struct emit_ops
*
5423 linux_emit_ops (void)
5425 if (the_low_target
.emit_ops
!= NULL
)
5426 return (*the_low_target
.emit_ops
) ();
5432 linux_get_min_fast_tracepoint_insn_len (void)
5434 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5437 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5440 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5441 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5443 char filename
[PATH_MAX
];
5445 const int auxv_size
= is_elf64
5446 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5447 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5449 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5451 fd
= open (filename
, O_RDONLY
);
5457 while (read (fd
, buf
, auxv_size
) == auxv_size
5458 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5462 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5464 switch (aux
->a_type
)
5467 *phdr_memaddr
= aux
->a_un
.a_val
;
5470 *num_phdr
= aux
->a_un
.a_val
;
5476 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5478 switch (aux
->a_type
)
5481 *phdr_memaddr
= aux
->a_un
.a_val
;
5484 *num_phdr
= aux
->a_un
.a_val
;
5492 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5494 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5495 "phdr_memaddr = %ld, phdr_num = %d",
5496 (long) *phdr_memaddr
, *num_phdr
);
5503 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5506 get_dynamic (const int pid
, const int is_elf64
)
5508 CORE_ADDR phdr_memaddr
, relocation
;
5510 unsigned char *phdr_buf
;
5511 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5513 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5516 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5517 phdr_buf
= alloca (num_phdr
* phdr_size
);
5519 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5522 /* Compute relocation: it is expected to be 0 for "regular" executables,
5523 non-zero for PIE ones. */
5525 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5528 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5530 if (p
->p_type
== PT_PHDR
)
5531 relocation
= phdr_memaddr
- p
->p_vaddr
;
5535 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5537 if (p
->p_type
== PT_PHDR
)
5538 relocation
= phdr_memaddr
- p
->p_vaddr
;
5541 if (relocation
== -1)
5543 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5544 any real world executables, including PIE executables, have always
5545 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5546 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5547 or present DT_DEBUG anyway (fpc binaries are statically linked).
5549 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5551 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5556 for (i
= 0; i
< num_phdr
; i
++)
5560 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5562 if (p
->p_type
== PT_DYNAMIC
)
5563 return p
->p_vaddr
+ relocation
;
5567 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5569 if (p
->p_type
== PT_DYNAMIC
)
5570 return p
->p_vaddr
+ relocation
;
5577 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5578 can be 0 if the inferior does not yet have the library list initialized.
5579 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5580 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5583 get_r_debug (const int pid
, const int is_elf64
)
5585 CORE_ADDR dynamic_memaddr
;
5586 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5587 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5590 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5591 if (dynamic_memaddr
== 0)
5594 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5598 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5599 #ifdef DT_MIPS_RLD_MAP
5603 unsigned char buf
[sizeof (Elf64_Xword
)];
5607 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5609 if (linux_read_memory (dyn
->d_un
.d_val
,
5610 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5615 #endif /* DT_MIPS_RLD_MAP */
5617 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5618 map
= dyn
->d_un
.d_val
;
5620 if (dyn
->d_tag
== DT_NULL
)
5625 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5626 #ifdef DT_MIPS_RLD_MAP
5630 unsigned char buf
[sizeof (Elf32_Word
)];
5634 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5636 if (linux_read_memory (dyn
->d_un
.d_val
,
5637 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5642 #endif /* DT_MIPS_RLD_MAP */
5644 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5645 map
= dyn
->d_un
.d_val
;
5647 if (dyn
->d_tag
== DT_NULL
)
5651 dynamic_memaddr
+= dyn_size
;
5657 /* Read one pointer from MEMADDR in the inferior. */
5660 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5664 /* Go through a union so this works on either big or little endian
5665 hosts, when the inferior's pointer size is smaller than the size
5666 of CORE_ADDR. It is assumed the inferior's endianness is the
5667 same of the superior's. */
5670 CORE_ADDR core_addr
;
5675 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5678 if (ptr_size
== sizeof (CORE_ADDR
))
5679 *ptr
= addr
.core_addr
;
5680 else if (ptr_size
== sizeof (unsigned int))
5683 gdb_assert_not_reached ("unhandled pointer size");
5688 struct link_map_offsets
5690 /* Offset and size of r_debug.r_version. */
5691 int r_version_offset
;
5693 /* Offset and size of r_debug.r_map. */
5696 /* Offset to l_addr field in struct link_map. */
5699 /* Offset to l_name field in struct link_map. */
5702 /* Offset to l_ld field in struct link_map. */
5705 /* Offset to l_next field in struct link_map. */
5708 /* Offset to l_prev field in struct link_map. */
5712 /* Construct qXfer:libraries-svr4:read reply. */
5715 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5716 unsigned const char *writebuf
,
5717 CORE_ADDR offset
, int len
)
5720 unsigned document_len
;
5721 struct process_info_private
*const priv
= current_process ()->private;
5722 char filename
[PATH_MAX
];
5725 static const struct link_map_offsets lmo_32bit_offsets
=
5727 0, /* r_version offset. */
5728 4, /* r_debug.r_map offset. */
5729 0, /* l_addr offset in link_map. */
5730 4, /* l_name offset in link_map. */
5731 8, /* l_ld offset in link_map. */
5732 12, /* l_next offset in link_map. */
5733 16 /* l_prev offset in link_map. */
5736 static const struct link_map_offsets lmo_64bit_offsets
=
5738 0, /* r_version offset. */
5739 8, /* r_debug.r_map offset. */
5740 0, /* l_addr offset in link_map. */
5741 8, /* l_name offset in link_map. */
5742 16, /* l_ld offset in link_map. */
5743 24, /* l_next offset in link_map. */
5744 32 /* l_prev offset in link_map. */
5746 const struct link_map_offsets
*lmo
;
5747 unsigned int machine
;
5749 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5750 int allocated
= 1024;
5752 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5753 int header_done
= 0;
5755 if (writebuf
!= NULL
)
5757 if (readbuf
== NULL
)
5760 pid
= lwpid_of (current_thread
);
5761 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5762 is_elf64
= elf_64_file_p (filename
, &machine
);
5763 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5764 ptr_size
= is_elf64
? 8 : 4;
5766 while (annex
[0] != '\0')
5772 sep
= strchr (annex
, '=');
5777 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5779 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5783 annex
= strchr (sep
, ';');
5790 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5797 if (priv
->r_debug
== 0)
5798 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5800 /* We failed to find DT_DEBUG. Such situation will not change
5801 for this inferior - do not retry it. Report it to GDB as
5802 E01, see for the reasons at the GDB solib-svr4.c side. */
5803 if (priv
->r_debug
== (CORE_ADDR
) -1)
5806 if (priv
->r_debug
!= 0)
5808 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5809 (unsigned char *) &r_version
,
5810 sizeof (r_version
)) != 0
5813 warning ("unexpected r_debug version %d", r_version
);
5815 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5816 &lm_addr
, ptr_size
) != 0)
5818 warning ("unable to read r_map from 0x%lx",
5819 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5824 document
= xmalloc (allocated
);
5825 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5826 p
= document
+ strlen (document
);
5829 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5830 &l_name
, ptr_size
) == 0
5831 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5832 &l_addr
, ptr_size
) == 0
5833 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5834 &l_ld
, ptr_size
) == 0
5835 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5836 &l_prev
, ptr_size
) == 0
5837 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5838 &l_next
, ptr_size
) == 0)
5840 unsigned char libname
[PATH_MAX
];
5842 if (lm_prev
!= l_prev
)
5844 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5845 (long) lm_prev
, (long) l_prev
);
5849 /* Ignore the first entry even if it has valid name as the first entry
5850 corresponds to the main executable. The first entry should not be
5851 skipped if the dynamic loader was loaded late by a static executable
5852 (see solib-svr4.c parameter ignore_first). But in such case the main
5853 executable does not have PT_DYNAMIC present and this function already
5854 exited above due to failed get_r_debug. */
5857 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5862 /* Not checking for error because reading may stop before
5863 we've got PATH_MAX worth of characters. */
5865 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5866 libname
[sizeof (libname
) - 1] = '\0';
5867 if (libname
[0] != '\0')
5869 /* 6x the size for xml_escape_text below. */
5870 size_t len
= 6 * strlen ((char *) libname
);
5875 /* Terminate `<library-list-svr4'. */
5880 while (allocated
< p
- document
+ len
+ 200)
5882 /* Expand to guarantee sufficient storage. */
5883 uintptr_t document_len
= p
- document
;
5885 document
= xrealloc (document
, 2 * allocated
);
5887 p
= document
+ document_len
;
5890 name
= xml_escape_text ((char *) libname
);
5891 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5892 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5893 name
, (unsigned long) lm_addr
,
5894 (unsigned long) l_addr
, (unsigned long) l_ld
);
5905 /* Empty list; terminate `<library-list-svr4'. */
5909 strcpy (p
, "</library-list-svr4>");
5911 document_len
= strlen (document
);
5912 if (offset
< document_len
)
5913 document_len
-= offset
;
5916 if (len
> document_len
)
5919 memcpy (readbuf
, document
+ offset
, len
);
5925 #ifdef HAVE_LINUX_BTRACE
5927 /* See to_enable_btrace target method. */
5929 static struct btrace_target_info
*
5930 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
5932 struct btrace_target_info
*tinfo
;
5934 tinfo
= linux_enable_btrace (ptid
, conf
);
5938 struct thread_info
*thread
= find_thread_ptid (ptid
);
5939 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5941 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5947 /* See to_disable_btrace target method. */
5950 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5952 enum btrace_error err
;
5954 err
= linux_disable_btrace (tinfo
);
5955 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5958 /* See to_read_btrace target method. */
5961 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5964 struct btrace_data btrace
;
5965 struct btrace_block
*block
;
5966 enum btrace_error err
;
5969 btrace_data_init (&btrace
);
5971 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5972 if (err
!= BTRACE_ERR_NONE
)
5974 if (err
== BTRACE_ERR_OVERFLOW
)
5975 buffer_grow_str0 (buffer
, "E.Overflow.");
5977 buffer_grow_str0 (buffer
, "E.Generic Error.");
5979 btrace_data_fini (&btrace
);
5983 switch (btrace
.format
)
5985 case BTRACE_FORMAT_NONE
:
5986 buffer_grow_str0 (buffer
, "E.No Trace.");
5989 case BTRACE_FORMAT_BTS
:
5990 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5991 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5994 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
5996 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5997 paddress (block
->begin
), paddress (block
->end
));
5999 buffer_grow_str0 (buffer
, "</btrace>\n");
6003 buffer_grow_str0 (buffer
, "E.Unknown Trace Format.");
6005 btrace_data_fini (&btrace
);
6009 btrace_data_fini (&btrace
);
6013 /* See to_btrace_conf target method. */
6016 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6017 struct buffer
*buffer
)
6019 const struct btrace_config
*conf
;
6021 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6022 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6024 conf
= linux_btrace_conf (tinfo
);
6027 switch (conf
->format
)
6029 case BTRACE_FORMAT_NONE
:
6032 case BTRACE_FORMAT_BTS
:
6033 buffer_xml_printf (buffer
, "<bts");
6034 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6035 buffer_xml_printf (buffer
, " />\n");
6040 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6043 #endif /* HAVE_LINUX_BTRACE */
6045 static struct target_ops linux_target_ops
= {
6046 linux_create_inferior
,
6055 linux_fetch_registers
,
6056 linux_store_registers
,
6057 linux_prepare_to_access_memory
,
6058 linux_done_accessing_memory
,
6061 linux_look_up_symbols
,
6062 linux_request_interrupt
,
6064 linux_supports_z_point_type
,
6067 linux_stopped_by_watchpoint
,
6068 linux_stopped_data_address
,
6069 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6070 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6071 && defined(PT_TEXT_END_ADDR)
6076 #ifdef USE_THREAD_DB
6077 thread_db_get_tls_address
,
6082 hostio_last_error_from_errno
,
6085 linux_supports_non_stop
,
6087 linux_start_non_stop
,
6088 linux_supports_multi_process
,
6089 #ifdef USE_THREAD_DB
6090 thread_db_handle_monitor_command
,
6094 linux_common_core_of_thread
,
6096 linux_process_qsupported
,
6097 linux_supports_tracepoints
,
6100 linux_thread_stopped
,
6104 linux_stabilize_threads
,
6105 linux_install_fast_tracepoint_jump_pad
,
6107 linux_supports_disable_randomization
,
6108 linux_get_min_fast_tracepoint_insn_len
,
6109 linux_qxfer_libraries_svr4
,
6110 linux_supports_agent
,
6111 #ifdef HAVE_LINUX_BTRACE
6112 linux_supports_btrace
,
6113 linux_low_enable_btrace
,
6114 linux_low_disable_btrace
,
6115 linux_low_read_btrace
,
6116 linux_low_btrace_conf
,
6124 linux_supports_range_stepping
,
6128 linux_init_signals ()
6130 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6131 to find what the cancel signal actually is. */
6132 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6133 signal (__SIGRTMIN
+1, SIG_IGN
);
6137 #ifdef HAVE_LINUX_REGSETS
6139 initialize_regsets_info (struct regsets_info
*info
)
6141 for (info
->num_regsets
= 0;
6142 info
->regsets
[info
->num_regsets
].size
>= 0;
6143 info
->num_regsets
++)
6149 initialize_low (void)
6151 struct sigaction sigchld_action
;
6152 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6153 set_target_ops (&linux_target_ops
);
6154 set_breakpoint_data (the_low_target
.breakpoint
,
6155 the_low_target
.breakpoint_len
);
6156 linux_init_signals ();
6157 linux_ptrace_init_warnings ();
6159 sigchld_action
.sa_handler
= sigchld_handler
;
6160 sigemptyset (&sigchld_action
.sa_mask
);
6161 sigchld_action
.sa_flags
= SA_RESTART
;
6162 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6164 initialize_low_arch ();