1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2014 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 "linux-osdata.h"
24 #include "nat/linux-nat.h"
25 #include "nat/linux-waitpid.h"
28 #include <sys/ptrace.h>
29 #include "linux-ptrace.h"
30 #include "linux-procfs.h"
32 #include <sys/ioctl.h>
38 #include <sys/syscall.h>
42 #include <sys/types.h>
47 #include "filestuff.h"
48 #include "tracepoint.h"
51 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
52 then ELFMAG0 will have been defined. If it didn't get included by
53 gdb_proc_service.h then including it will likely introduce a duplicate
54 definition of elf_fpregset_t. */
59 #define SPUFS_MAGIC 0x23c9b64e
62 #ifdef HAVE_PERSONALITY
63 # include <sys/personality.h>
64 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
65 # define ADDR_NO_RANDOMIZE 0x0040000
74 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
77 /* This is the kernel's hard limit. Not to be confused with
83 /* Some targets did not define these ptrace constants from the start,
84 so gdbserver defines them locally here. In the future, these may
85 be removed after they are added to asm/ptrace.h. */
86 #if !(defined(PT_TEXT_ADDR) \
87 || defined(PT_DATA_ADDR) \
88 || defined(PT_TEXT_END_ADDR))
89 #if defined(__mcoldfire__)
90 /* These are still undefined in 3.10 kernels. */
91 #define PT_TEXT_ADDR 49*4
92 #define PT_DATA_ADDR 50*4
93 #define PT_TEXT_END_ADDR 51*4
94 /* BFIN already defines these since at least 2.6.32 kernels. */
96 #define PT_TEXT_ADDR 220
97 #define PT_TEXT_END_ADDR 224
98 #define PT_DATA_ADDR 228
99 /* These are still undefined in 3.10 kernels. */
100 #elif defined(__TMS320C6X__)
101 #define PT_TEXT_ADDR (0x10000*4)
102 #define PT_DATA_ADDR (0x10004*4)
103 #define PT_TEXT_END_ADDR (0x10008*4)
107 #ifdef HAVE_LINUX_BTRACE
108 # include "linux-btrace.h"
111 #ifndef HAVE_ELF32_AUXV_T
112 /* Copied from glibc's elf.h. */
115 uint32_t a_type
; /* Entry type */
118 uint32_t a_val
; /* Integer value */
119 /* We use to have pointer elements added here. We cannot do that,
120 though, since it does not work when using 32-bit definitions
121 on 64-bit platforms and vice versa. */
126 #ifndef HAVE_ELF64_AUXV_T
127 /* Copied from glibc's elf.h. */
130 uint64_t a_type
; /* Entry type */
133 uint64_t a_val
; /* Integer value */
134 /* We use to have pointer elements added here. We cannot do that,
135 though, since it does not work when using 32-bit definitions
136 on 64-bit platforms and vice versa. */
141 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
142 representation of the thread ID.
144 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
145 the same as the LWP ID.
147 ``all_processes'' is keyed by the "overall process ID", which
148 GNU/Linux calls tgid, "thread group ID". */
150 struct inferior_list all_lwps
;
152 /* A list of all unknown processes which receive stop signals. Some
153 other process will presumably claim each of these as forked
154 children momentarily. */
156 struct simple_pid_list
158 /* The process ID. */
161 /* The status as reported by waitpid. */
165 struct simple_pid_list
*next
;
167 struct simple_pid_list
*stopped_pids
;
169 /* Trivial list manipulation functions to keep track of a list of new
170 stopped processes. */
173 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
175 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
178 new_pid
->status
= status
;
179 new_pid
->next
= *listp
;
184 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
186 struct simple_pid_list
**p
;
188 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
189 if ((*p
)->pid
== pid
)
191 struct simple_pid_list
*next
= (*p
)->next
;
193 *statusp
= (*p
)->status
;
201 enum stopping_threads_kind
203 /* Not stopping threads presently. */
204 NOT_STOPPING_THREADS
,
206 /* Stopping threads. */
209 /* Stopping and suspending threads. */
210 STOPPING_AND_SUSPENDING_THREADS
213 /* This is set while stop_all_lwps is in effect. */
214 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
216 /* FIXME make into a target method? */
217 int using_threads
= 1;
219 /* True if we're presently stabilizing threads (moving them out of
221 static int stabilizing_threads
;
223 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
224 int step
, int signal
, siginfo_t
*info
);
225 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
226 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
227 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
228 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
229 static struct lwp_info
*add_lwp (ptid_t ptid
);
230 static int linux_stopped_by_watchpoint (void);
231 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
232 static void proceed_all_lwps (void);
233 static int finish_step_over (struct lwp_info
*lwp
);
234 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
235 static int kill_lwp (unsigned long lwpid
, int signo
);
237 /* True if the low target can hardware single-step. Such targets
238 don't need a BREAKPOINT_REINSERT_ADDR callback. */
241 can_hardware_single_step (void)
243 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
246 /* True if the low target supports memory breakpoints. If so, we'll
247 have a GET_PC implementation. */
250 supports_breakpoints (void)
252 return (the_low_target
.get_pc
!= NULL
);
255 /* Returns true if this target can support fast tracepoints. This
256 does not mean that the in-process agent has been loaded in the
260 supports_fast_tracepoints (void)
262 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
265 /* True if LWP is stopped in its stepping range. */
268 lwp_in_step_range (struct lwp_info
*lwp
)
270 CORE_ADDR pc
= lwp
->stop_pc
;
272 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
275 struct pending_signals
279 struct pending_signals
*prev
;
282 /* The read/write ends of the pipe registered as waitable file in the
284 static int linux_event_pipe
[2] = { -1, -1 };
286 /* True if we're currently in async mode. */
287 #define target_is_async_p() (linux_event_pipe[0] != -1)
289 static void send_sigstop (struct lwp_info
*lwp
);
290 static void wait_for_sigstop (struct inferior_list_entry
*entry
);
292 /* Return non-zero if HEADER is a 64-bit ELF file. */
295 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
297 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
298 && header
->e_ident
[EI_MAG1
] == ELFMAG1
299 && header
->e_ident
[EI_MAG2
] == ELFMAG2
300 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
302 *machine
= header
->e_machine
;
303 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
310 /* Return non-zero if FILE is a 64-bit ELF file,
311 zero if the file is not a 64-bit ELF file,
312 and -1 if the file is not accessible or doesn't exist. */
315 elf_64_file_p (const char *file
, unsigned int *machine
)
320 fd
= open (file
, O_RDONLY
);
324 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
331 return elf_64_header_p (&header
, machine
);
334 /* Accepts an integer PID; Returns true if the executable PID is
335 running is a 64-bit ELF file.. */
338 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
342 sprintf (file
, "/proc/%d/exe", pid
);
343 return elf_64_file_p (file
, machine
);
347 delete_lwp (struct lwp_info
*lwp
)
349 remove_thread (get_lwp_thread (lwp
));
350 remove_inferior (&all_lwps
, &lwp
->entry
);
351 free (lwp
->arch_private
);
355 /* Add a process to the common process list, and set its private
358 static struct process_info
*
359 linux_add_process (int pid
, int attached
)
361 struct process_info
*proc
;
363 proc
= add_process (pid
, attached
);
364 proc
->private = xcalloc (1, sizeof (*proc
->private));
366 /* Set the arch when the first LWP stops. */
367 proc
->private->new_inferior
= 1;
369 if (the_low_target
.new_process
!= NULL
)
370 proc
->private->arch_private
= the_low_target
.new_process ();
375 /* Handle a GNU/Linux extended wait response. If we see a clone
376 event, we need to add the new LWP to our list (and not report the
377 trap to higher layers). */
380 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
382 int event
= wstat
>> 16;
383 struct lwp_info
*new_lwp
;
385 if (event
== PTRACE_EVENT_CLONE
)
388 unsigned long new_pid
;
391 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), (PTRACE_TYPE_ARG3
) 0,
394 /* If we haven't already seen the new PID stop, wait for it now. */
395 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
397 /* The new child has a pending SIGSTOP. We can't affect it until it
398 hits the SIGSTOP, but we're already attached. */
400 ret
= my_waitpid (new_pid
, &status
, __WALL
);
403 perror_with_name ("waiting for new child");
404 else if (ret
!= new_pid
)
405 warning ("wait returned unexpected PID %d", ret
);
406 else if (!WIFSTOPPED (status
))
407 warning ("wait returned unexpected status 0x%x", status
);
410 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
411 new_lwp
= add_lwp (ptid
);
413 /* Either we're going to immediately resume the new thread
414 or leave it stopped. linux_resume_one_lwp is a nop if it
415 thinks the thread is currently running, so set this first
416 before calling linux_resume_one_lwp. */
417 new_lwp
->stopped
= 1;
419 /* If we're suspending all threads, leave this one suspended
421 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
422 new_lwp
->suspended
= 1;
424 /* Normally we will get the pending SIGSTOP. But in some cases
425 we might get another signal delivered to the group first.
426 If we do get another signal, be sure not to lose it. */
427 if (WSTOPSIG (status
) == SIGSTOP
)
429 if (stopping_threads
!= NOT_STOPPING_THREADS
)
430 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
432 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
436 new_lwp
->stop_expected
= 1;
438 if (stopping_threads
!= NOT_STOPPING_THREADS
)
440 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
441 new_lwp
->status_pending_p
= 1;
442 new_lwp
->status_pending
= status
;
445 /* Pass the signal on. This is what GDB does - except
446 shouldn't we really report it instead? */
447 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
450 /* Always resume the current thread. If we are stopping
451 threads, it will have a pending SIGSTOP; we may as well
453 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
457 /* Return the PC as read from the regcache of LWP, without any
461 get_pc (struct lwp_info
*lwp
)
463 struct thread_info
*saved_inferior
;
464 struct regcache
*regcache
;
467 if (the_low_target
.get_pc
== NULL
)
470 saved_inferior
= current_inferior
;
471 current_inferior
= get_lwp_thread (lwp
);
473 regcache
= get_thread_regcache (current_inferior
, 1);
474 pc
= (*the_low_target
.get_pc
) (regcache
);
477 debug_printf ("pc is 0x%lx\n", (long) pc
);
479 current_inferior
= saved_inferior
;
483 /* This function should only be called if LWP got a SIGTRAP.
484 The SIGTRAP could mean several things.
486 On i386, where decr_pc_after_break is non-zero:
487 If we were single-stepping this process using PTRACE_SINGLESTEP,
488 we will get only the one SIGTRAP (even if the instruction we
489 stepped over was a breakpoint). The value of $eip will be the
491 If we continue the process using PTRACE_CONT, we will get a
492 SIGTRAP when we hit a breakpoint. The value of $eip will be
493 the instruction after the breakpoint (i.e. needs to be
494 decremented). If we report the SIGTRAP to GDB, we must also
495 report the undecremented PC. If we cancel the SIGTRAP, we
496 must resume at the decremented PC.
498 (Presumably, not yet tested) On a non-decr_pc_after_break machine
499 with hardware or kernel single-step:
500 If we single-step over a breakpoint instruction, our PC will
501 point at the following instruction. If we continue and hit a
502 breakpoint instruction, our PC will point at the breakpoint
506 get_stop_pc (struct lwp_info
*lwp
)
510 if (the_low_target
.get_pc
== NULL
)
513 stop_pc
= get_pc (lwp
);
515 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
517 && !lwp
->stopped_by_watchpoint
518 && lwp
->last_status
>> 16 == 0)
519 stop_pc
-= the_low_target
.decr_pc_after_break
;
522 debug_printf ("stop pc is 0x%lx\n", (long) stop_pc
);
527 static struct lwp_info
*
528 add_lwp (ptid_t ptid
)
530 struct lwp_info
*lwp
;
532 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
533 memset (lwp
, 0, sizeof (*lwp
));
535 lwp
->entry
.id
= ptid
;
537 if (the_low_target
.new_thread
!= NULL
)
538 lwp
->arch_private
= the_low_target
.new_thread ();
540 add_inferior_to_list (&all_lwps
, &lwp
->entry
);
541 lwp
->thread
= add_thread (ptid
, lwp
);
546 /* Start an inferior process and returns its pid.
547 ALLARGS is a vector of program-name and args. */
550 linux_create_inferior (char *program
, char **allargs
)
552 #ifdef HAVE_PERSONALITY
553 int personality_orig
= 0, personality_set
= 0;
555 struct lwp_info
*new_lwp
;
559 #ifdef HAVE_PERSONALITY
560 if (disable_randomization
)
563 personality_orig
= personality (0xffffffff);
564 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
567 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
569 if (errno
!= 0 || (personality_set
570 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
571 warning ("Error disabling address space randomization: %s",
576 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
582 perror_with_name ("fork");
587 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
589 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
590 signal (__SIGRTMIN
+ 1, SIG_DFL
);
595 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
596 stdout to stderr so that inferior i/o doesn't corrupt the connection.
597 Also, redirect stdin to /dev/null. */
598 if (remote_connection_is_stdio ())
601 open ("/dev/null", O_RDONLY
);
603 if (write (2, "stdin/stdout redirected\n",
604 sizeof ("stdin/stdout redirected\n") - 1) < 0)
606 /* Errors ignored. */;
610 execv (program
, allargs
);
612 execvp (program
, allargs
);
614 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
620 #ifdef HAVE_PERSONALITY
624 personality (personality_orig
);
626 warning ("Error restoring address space randomization: %s",
631 linux_add_process (pid
, 0);
633 ptid
= ptid_build (pid
, pid
, 0);
634 new_lwp
= add_lwp (ptid
);
635 new_lwp
->must_set_ptrace_flags
= 1;
640 /* Attach to an inferior process. */
643 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
646 struct lwp_info
*new_lwp
;
648 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
651 struct buffer buffer
;
655 /* If we fail to attach to an LWP, just warn. */
656 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
657 strerror (errno
), errno
);
662 /* If we fail to attach to a process, report an error. */
663 buffer_init (&buffer
);
664 linux_ptrace_attach_warnings (lwpid
, &buffer
);
665 buffer_grow_str0 (&buffer
, "");
666 error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer
),
667 lwpid
, strerror (errno
), errno
);
671 /* If lwp is the tgid, we handle adding existing threads later.
672 Otherwise we just add lwp without bothering about any other
674 ptid
= ptid_build (lwpid
, lwpid
, 0);
677 /* Note that extracting the pid from the current inferior is
678 safe, since we're always called in the context of the same
679 process as this new thread. */
680 int pid
= pid_of (get_thread_lwp (current_inferior
));
681 ptid
= ptid_build (pid
, lwpid
, 0);
684 new_lwp
= add_lwp (ptid
);
686 /* We need to wait for SIGSTOP before being able to make the next
687 ptrace call on this LWP. */
688 new_lwp
->must_set_ptrace_flags
= 1;
690 if (linux_proc_pid_is_stopped (lwpid
))
693 debug_printf ("Attached to a stopped process\n");
695 /* The process is definitely stopped. It is in a job control
696 stop, unless the kernel predates the TASK_STOPPED /
697 TASK_TRACED distinction, in which case it might be in a
698 ptrace stop. Make sure it is in a ptrace stop; from there we
699 can kill it, signal it, et cetera.
701 First make sure there is a pending SIGSTOP. Since we are
702 already attached, the process can not transition from stopped
703 to running without a PTRACE_CONT; so we know this signal will
704 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
705 probably already in the queue (unless this kernel is old
706 enough to use TASK_STOPPED for ptrace stops); but since
707 SIGSTOP is not an RT signal, it can only be queued once. */
708 kill_lwp (lwpid
, SIGSTOP
);
710 /* Finally, resume the stopped process. This will deliver the
711 SIGSTOP (or a higher priority signal, just like normal
712 PTRACE_ATTACH), which we'll catch later on. */
713 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
716 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
719 There are several cases to consider here:
721 1) gdbserver has already attached to the process and is being notified
722 of a new thread that is being created.
723 In this case we should ignore that SIGSTOP and resume the
724 process. This is handled below by setting stop_expected = 1,
725 and the fact that add_thread sets last_resume_kind ==
728 2) This is the first thread (the process thread), and we're attaching
729 to it via attach_inferior.
730 In this case we want the process thread to stop.
731 This is handled by having linux_attach set last_resume_kind ==
732 resume_stop after we return.
734 If the pid we are attaching to is also the tgid, we attach to and
735 stop all the existing threads. Otherwise, we attach to pid and
736 ignore any other threads in the same group as this pid.
738 3) GDB is connecting to gdbserver and is requesting an enumeration of all
740 In this case we want the thread to stop.
741 FIXME: This case is currently not properly handled.
742 We should wait for the SIGSTOP but don't. Things work apparently
743 because enough time passes between when we ptrace (ATTACH) and when
744 gdb makes the next ptrace call on the thread.
746 On the other hand, if we are currently trying to stop all threads, we
747 should treat the new thread as if we had sent it a SIGSTOP. This works
748 because we are guaranteed that the add_lwp call above added us to the
749 end of the list, and so the new thread has not yet reached
750 wait_for_sigstop (but will). */
751 new_lwp
->stop_expected
= 1;
755 linux_attach_lwp (unsigned long lwpid
)
757 linux_attach_lwp_1 (lwpid
, 0);
760 /* Attach to PID. If PID is the tgid, attach to it and all
764 linux_attach (unsigned long pid
)
766 /* Attach to PID. We will check for other threads
768 linux_attach_lwp_1 (pid
, 1);
769 linux_add_process (pid
, 1);
773 struct thread_info
*thread
;
775 /* Don't ignore the initial SIGSTOP if we just attached to this
776 process. It will be collected by wait shortly. */
777 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
778 thread
->last_resume_kind
= resume_stop
;
781 if (linux_proc_get_tgid (pid
) == pid
)
786 sprintf (pathname
, "/proc/%ld/task", pid
);
788 dir
= opendir (pathname
);
792 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
797 /* At this point we attached to the tgid. Scan the task for
800 int new_threads_found
;
804 while (iterations
< 2)
806 new_threads_found
= 0;
807 /* Add all the other threads. While we go through the
808 threads, new threads may be spawned. Cycle through
809 the list of threads until we have done two iterations without
810 finding new threads. */
811 while ((dp
= readdir (dir
)) != NULL
)
814 lwp
= strtoul (dp
->d_name
, NULL
, 10);
816 /* Is this a new thread? */
818 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
820 linux_attach_lwp_1 (lwp
, 0);
824 debug_printf ("Found and attached to new lwp %ld\n",
829 if (!new_threads_found
)
850 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
852 struct counter
*counter
= args
;
854 if (ptid_get_pid (entry
->id
) == counter
->pid
)
856 if (++counter
->count
> 1)
864 last_thread_of_process_p (struct thread_info
*thread
)
866 ptid_t ptid
= thread
->entry
.id
;
867 int pid
= ptid_get_pid (ptid
);
868 struct counter counter
= { pid
, 0 };
870 return (find_inferior (&all_threads
,
871 second_thread_of_pid_p
, &counter
) == NULL
);
877 linux_kill_one_lwp (struct lwp_info
*lwp
)
879 int pid
= lwpid_of (lwp
);
881 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
882 there is no signal context, and ptrace(PTRACE_KILL) (or
883 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
884 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
885 alternative is to kill with SIGKILL. We only need one SIGKILL
886 per process, not one for each thread. But since we still support
887 linuxthreads, and we also support debugging programs using raw
888 clone without CLONE_THREAD, we send one for each thread. For
889 years, we used PTRACE_KILL only, so we're being a bit paranoid
890 about some old kernels where PTRACE_KILL might work better
891 (dubious if there are any such, but that's why it's paranoia), so
892 we try SIGKILL first, PTRACE_KILL second, and so we're fine
898 debug_printf ("LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
899 target_pid_to_str (ptid_of (lwp
)),
900 errno
? strerror (errno
) : "OK");
903 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
905 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
906 target_pid_to_str (ptid_of (lwp
)),
907 errno
? strerror (errno
) : "OK");
910 /* Callback for `find_inferior'. Kills an lwp of a given process,
911 except the leader. */
914 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
916 struct thread_info
*thread
= (struct thread_info
*) entry
;
917 struct lwp_info
*lwp
= get_thread_lwp (thread
);
919 int pid
= * (int *) args
;
921 if (ptid_get_pid (entry
->id
) != pid
)
924 /* We avoid killing the first thread here, because of a Linux kernel (at
925 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
926 the children get a chance to be reaped, it will remain a zombie
929 if (lwpid_of (lwp
) == pid
)
932 debug_printf ("lkop: is last of process %s\n",
933 target_pid_to_str (entry
->id
));
939 linux_kill_one_lwp (lwp
);
941 /* Make sure it died. The loop is most likely unnecessary. */
942 pid
= linux_wait_for_event (lwp
->entry
.id
, &wstat
, __WALL
);
943 } while (pid
> 0 && WIFSTOPPED (wstat
));
951 struct process_info
*process
;
952 struct lwp_info
*lwp
;
956 process
= find_process_pid (pid
);
960 /* If we're killing a running inferior, make sure it is stopped
961 first, as PTRACE_KILL will not work otherwise. */
962 stop_all_lwps (0, NULL
);
964 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
966 /* See the comment in linux_kill_one_lwp. We did not kill the first
967 thread in the list, so do so now. */
968 lwp
= find_lwp_pid (pid_to_ptid (pid
));
973 debug_printf ("lk_1: cannot find lwp %ld, for pid: %d\n",
974 lwpid_of (lwp
), pid
);
979 debug_printf ("lk_1: killing lwp %ld, for pid: %d\n",
980 lwpid_of (lwp
), pid
);
984 linux_kill_one_lwp (lwp
);
986 /* Make sure it died. The loop is most likely unnecessary. */
987 lwpid
= linux_wait_for_event (lwp
->entry
.id
, &wstat
, __WALL
);
988 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
991 the_target
->mourn (process
);
993 /* Since we presently can only stop all lwps of all processes, we
994 need to unstop lwps of other processes. */
995 unstop_all_lwps (0, NULL
);
999 /* Get pending signal of THREAD, for detaching purposes. This is the
1000 signal the thread last stopped for, which we need to deliver to the
1001 thread when detaching, otherwise, it'd be suppressed/lost. */
1004 get_detach_signal (struct thread_info
*thread
)
1006 enum gdb_signal signo
= GDB_SIGNAL_0
;
1008 struct lwp_info
*lp
= get_thread_lwp (thread
);
1010 if (lp
->status_pending_p
)
1011 status
= lp
->status_pending
;
1014 /* If the thread had been suspended by gdbserver, and it stopped
1015 cleanly, then it'll have stopped with SIGSTOP. But we don't
1016 want to deliver that SIGSTOP. */
1017 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1018 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1021 /* Otherwise, we may need to deliver the signal we
1023 status
= lp
->last_status
;
1026 if (!WIFSTOPPED (status
))
1029 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1030 target_pid_to_str (ptid_of (lp
)));
1034 /* Extended wait statuses aren't real SIGTRAPs. */
1035 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1038 debug_printf ("GPS: lwp %s had stopped with extended "
1039 "status: no pending signal\n",
1040 target_pid_to_str (ptid_of (lp
)));
1044 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1046 if (program_signals_p
&& !program_signals
[signo
])
1049 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1050 target_pid_to_str (ptid_of (lp
)),
1051 gdb_signal_to_string (signo
));
1054 else if (!program_signals_p
1055 /* If we have no way to know which signals GDB does not
1056 want to have passed to the program, assume
1057 SIGTRAP/SIGINT, which is GDB's default. */
1058 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1061 debug_printf ("GPS: lwp %s had signal %s, "
1062 "but we don't know if we should pass it. "
1063 "Default to not.\n",
1064 target_pid_to_str (ptid_of (lp
)),
1065 gdb_signal_to_string (signo
));
1071 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1072 target_pid_to_str (ptid_of (lp
)),
1073 gdb_signal_to_string (signo
));
1075 return WSTOPSIG (status
);
1080 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1082 struct thread_info
*thread
= (struct thread_info
*) entry
;
1083 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1084 int pid
= * (int *) args
;
1087 if (ptid_get_pid (entry
->id
) != pid
)
1090 /* If there is a pending SIGSTOP, get rid of it. */
1091 if (lwp
->stop_expected
)
1094 debug_printf ("Sending SIGCONT to %s\n",
1095 target_pid_to_str (ptid_of (lwp
)));
1097 kill_lwp (lwpid_of (lwp
), SIGCONT
);
1098 lwp
->stop_expected
= 0;
1101 /* Flush any pending changes to the process's registers. */
1102 regcache_invalidate_thread (get_lwp_thread (lwp
));
1104 /* Pass on any pending signal for this thread. */
1105 sig
= get_detach_signal (thread
);
1107 /* Finally, let it resume. */
1108 if (the_low_target
.prepare_to_resume
!= NULL
)
1109 the_low_target
.prepare_to_resume (lwp
);
1110 if (ptrace (PTRACE_DETACH
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1111 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1112 error (_("Can't detach %s: %s"),
1113 target_pid_to_str (ptid_of (lwp
)),
1121 linux_detach (int pid
)
1123 struct process_info
*process
;
1125 process
= find_process_pid (pid
);
1126 if (process
== NULL
)
1129 /* Stop all threads before detaching. First, ptrace requires that
1130 the thread is stopped to sucessfully detach. Second, thread_db
1131 may need to uninstall thread event breakpoints from memory, which
1132 only works with a stopped process anyway. */
1133 stop_all_lwps (0, NULL
);
1135 #ifdef USE_THREAD_DB
1136 thread_db_detach (process
);
1139 /* Stabilize threads (move out of jump pads). */
1140 stabilize_threads ();
1142 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1144 the_target
->mourn (process
);
1146 /* Since we presently can only stop all lwps of all processes, we
1147 need to unstop lwps of other processes. */
1148 unstop_all_lwps (0, NULL
);
1152 /* Remove all LWPs that belong to process PROC from the lwp list. */
1155 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1157 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1158 struct process_info
*process
= proc
;
1160 if (pid_of (lwp
) == pid_of (process
))
1167 linux_mourn (struct process_info
*process
)
1169 struct process_info_private
*priv
;
1171 #ifdef USE_THREAD_DB
1172 thread_db_mourn (process
);
1175 find_inferior (&all_lwps
, delete_lwp_callback
, process
);
1177 /* Freeing all private data. */
1178 priv
= process
->private;
1179 free (priv
->arch_private
);
1181 process
->private = NULL
;
1183 remove_process (process
);
1187 linux_join (int pid
)
1192 ret
= my_waitpid (pid
, &status
, 0);
1193 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1195 } while (ret
!= -1 || errno
!= ECHILD
);
1198 /* Return nonzero if the given thread is still alive. */
1200 linux_thread_alive (ptid_t ptid
)
1202 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1204 /* We assume we always know if a thread exits. If a whole process
1205 exited but we still haven't been able to report it to GDB, we'll
1206 hold on to the last lwp of the dead process. */
1213 /* Return 1 if this lwp has an interesting status pending. */
1215 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1217 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1218 ptid_t ptid
= * (ptid_t
*) arg
;
1219 struct thread_info
*thread
;
1221 /* Check if we're only interested in events from a specific process
1223 if (!ptid_equal (minus_one_ptid
, ptid
)
1224 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->entry
.id
))
1227 thread
= get_lwp_thread (lwp
);
1229 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1230 report any status pending the LWP may have. */
1231 if (thread
->last_resume_kind
== resume_stop
1232 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1235 return lwp
->status_pending_p
;
1239 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1241 ptid_t ptid
= *(ptid_t
*) data
;
1244 if (ptid_get_lwp (ptid
) != 0)
1245 lwp
= ptid_get_lwp (ptid
);
1247 lwp
= ptid_get_pid (ptid
);
1249 if (ptid_get_lwp (entry
->id
) == lwp
)
1256 find_lwp_pid (ptid_t ptid
)
1258 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1261 static struct lwp_info
*
1262 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1265 int to_wait_for
= -1;
1266 struct lwp_info
*child
= NULL
;
1269 debug_printf ("linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1271 if (ptid_equal (ptid
, minus_one_ptid
))
1272 to_wait_for
= -1; /* any child */
1274 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1280 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1281 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1284 perror_with_name ("waitpid");
1287 && (!WIFSTOPPED (*wstatp
)
1288 || (WSTOPSIG (*wstatp
) != 32
1289 && WSTOPSIG (*wstatp
) != 33)))
1290 debug_printf ("Got an event from %d (%x)\n", ret
, *wstatp
);
1292 child
= find_lwp_pid (pid_to_ptid (ret
));
1294 /* If we didn't find a process, one of two things presumably happened:
1295 - A process we started and then detached from has exited. Ignore it.
1296 - A process we are controlling has forked and the new child's stop
1297 was reported to us by the kernel. Save its PID. */
1298 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1300 add_to_pid_list (&stopped_pids
, ret
, *wstatp
);
1303 else if (child
== NULL
)
1308 child
->last_status
= *wstatp
;
1310 if (WIFSTOPPED (*wstatp
))
1312 struct process_info
*proc
;
1314 /* Architecture-specific setup after inferior is running. This
1315 needs to happen after we have attached to the inferior and it
1316 is stopped for the first time, but before we access any
1317 inferior registers. */
1318 proc
= find_process_pid (pid_of (child
));
1319 if (proc
->private->new_inferior
)
1321 struct thread_info
*saved_inferior
;
1323 saved_inferior
= current_inferior
;
1324 current_inferior
= get_lwp_thread (child
);
1326 the_low_target
.arch_setup ();
1328 current_inferior
= saved_inferior
;
1330 proc
->private->new_inferior
= 0;
1334 /* Fetch the possibly triggered data watchpoint info and store it in
1337 On some archs, like x86, that use debug registers to set
1338 watchpoints, it's possible that the way to know which watched
1339 address trapped, is to check the register that is used to select
1340 which address to watch. Problem is, between setting the
1341 watchpoint and reading back which data address trapped, the user
1342 may change the set of watchpoints, and, as a consequence, GDB
1343 changes the debug registers in the inferior. To avoid reading
1344 back a stale stopped-data-address when that happens, we cache in
1345 LP the fact that a watchpoint trapped, and the corresponding data
1346 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1347 changes the debug registers meanwhile, we have the cached data we
1350 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1352 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1354 child
->stopped_by_watchpoint
= 0;
1358 struct thread_info
*saved_inferior
;
1360 saved_inferior
= current_inferior
;
1361 current_inferior
= get_lwp_thread (child
);
1363 child
->stopped_by_watchpoint
1364 = the_low_target
.stopped_by_watchpoint ();
1366 if (child
->stopped_by_watchpoint
)
1368 if (the_low_target
.stopped_data_address
!= NULL
)
1369 child
->stopped_data_address
1370 = the_low_target
.stopped_data_address ();
1372 child
->stopped_data_address
= 0;
1375 current_inferior
= saved_inferior
;
1379 /* Store the STOP_PC, with adjustment applied. This depends on the
1380 architecture being defined already (so that CHILD has a valid
1381 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1383 if (WIFSTOPPED (*wstatp
))
1384 child
->stop_pc
= get_stop_pc (child
);
1387 && WIFSTOPPED (*wstatp
)
1388 && the_low_target
.get_pc
!= NULL
)
1390 struct thread_info
*saved_inferior
= current_inferior
;
1391 struct regcache
*regcache
;
1394 current_inferior
= get_lwp_thread (child
);
1395 regcache
= get_thread_regcache (current_inferior
, 1);
1396 pc
= (*the_low_target
.get_pc
) (regcache
);
1397 debug_printf ("linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1398 current_inferior
= saved_inferior
;
1404 /* This function should only be called if the LWP got a SIGTRAP.
1406 Handle any tracepoint steps or hits. Return true if a tracepoint
1407 event was handled, 0 otherwise. */
1410 handle_tracepoints (struct lwp_info
*lwp
)
1412 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1413 int tpoint_related_event
= 0;
1415 /* If this tracepoint hit causes a tracing stop, we'll immediately
1416 uninsert tracepoints. To do this, we temporarily pause all
1417 threads, unpatch away, and then unpause threads. We need to make
1418 sure the unpausing doesn't resume LWP too. */
1421 /* And we need to be sure that any all-threads-stopping doesn't try
1422 to move threads out of the jump pads, as it could deadlock the
1423 inferior (LWP could be in the jump pad, maybe even holding the
1426 /* Do any necessary step collect actions. */
1427 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1429 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1431 /* See if we just hit a tracepoint and do its main collect
1433 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1437 gdb_assert (lwp
->suspended
== 0);
1438 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1440 if (tpoint_related_event
)
1443 debug_printf ("got a tracepoint event\n");
1450 /* Convenience wrapper. Returns true if LWP is presently collecting a
1454 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1455 struct fast_tpoint_collect_status
*status
)
1457 CORE_ADDR thread_area
;
1459 if (the_low_target
.get_thread_area
== NULL
)
1462 /* Get the thread area address. This is used to recognize which
1463 thread is which when tracing with the in-process agent library.
1464 We don't read anything from the address, and treat it as opaque;
1465 it's the address itself that we assume is unique per-thread. */
1466 if ((*the_low_target
.get_thread_area
) (lwpid_of (lwp
), &thread_area
) == -1)
1469 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1472 /* The reason we resume in the caller, is because we want to be able
1473 to pass lwp->status_pending as WSTAT, and we need to clear
1474 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1475 refuses to resume. */
1478 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1480 struct thread_info
*saved_inferior
;
1482 saved_inferior
= current_inferior
;
1483 current_inferior
= get_lwp_thread (lwp
);
1486 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1487 && supports_fast_tracepoints ()
1488 && agent_loaded_p ())
1490 struct fast_tpoint_collect_status status
;
1494 debug_printf ("Checking whether LWP %ld needs to move out of the "
1498 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1501 || (WSTOPSIG (*wstat
) != SIGILL
1502 && WSTOPSIG (*wstat
) != SIGFPE
1503 && WSTOPSIG (*wstat
) != SIGSEGV
1504 && WSTOPSIG (*wstat
) != SIGBUS
))
1506 lwp
->collecting_fast_tracepoint
= r
;
1510 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1512 /* Haven't executed the original instruction yet.
1513 Set breakpoint there, and wait till it's hit,
1514 then single-step until exiting the jump pad. */
1515 lwp
->exit_jump_pad_bkpt
1516 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1520 debug_printf ("Checking whether LWP %ld needs to move out of "
1521 "the jump pad...it does\n",
1523 current_inferior
= saved_inferior
;
1530 /* If we get a synchronous signal while collecting, *and*
1531 while executing the (relocated) original instruction,
1532 reset the PC to point at the tpoint address, before
1533 reporting to GDB. Otherwise, it's an IPA lib bug: just
1534 report the signal to GDB, and pray for the best. */
1536 lwp
->collecting_fast_tracepoint
= 0;
1539 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1540 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1543 struct regcache
*regcache
;
1545 /* The si_addr on a few signals references the address
1546 of the faulting instruction. Adjust that as
1548 if ((WSTOPSIG (*wstat
) == SIGILL
1549 || WSTOPSIG (*wstat
) == SIGFPE
1550 || WSTOPSIG (*wstat
) == SIGBUS
1551 || WSTOPSIG (*wstat
) == SIGSEGV
)
1552 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
),
1553 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1554 /* Final check just to make sure we don't clobber
1555 the siginfo of non-kernel-sent signals. */
1556 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1558 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1559 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
),
1560 (PTRACE_TYPE_ARG3
) 0, &info
);
1563 regcache
= get_thread_regcache (get_lwp_thread (lwp
), 1);
1564 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1565 lwp
->stop_pc
= status
.tpoint_addr
;
1567 /* Cancel any fast tracepoint lock this thread was
1569 force_unlock_trace_buffer ();
1572 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1575 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1576 "stopping all threads momentarily.\n");
1578 stop_all_lwps (1, lwp
);
1579 cancel_breakpoints ();
1581 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1582 lwp
->exit_jump_pad_bkpt
= NULL
;
1584 unstop_all_lwps (1, lwp
);
1586 gdb_assert (lwp
->suspended
>= 0);
1592 debug_printf ("Checking whether LWP %ld needs to move out of the "
1596 current_inferior
= saved_inferior
;
1600 /* Enqueue one signal in the "signals to report later when out of the
1604 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1606 struct pending_signals
*p_sig
;
1609 debug_printf ("Deferring signal %d for LWP %ld.\n",
1610 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1614 struct pending_signals
*sig
;
1616 for (sig
= lwp
->pending_signals_to_report
;
1619 debug_printf (" Already queued %d\n",
1622 debug_printf (" (no more currently queued signals)\n");
1625 /* Don't enqueue non-RT signals if they are already in the deferred
1626 queue. (SIGSTOP being the easiest signal to see ending up here
1628 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1630 struct pending_signals
*sig
;
1632 for (sig
= lwp
->pending_signals_to_report
;
1636 if (sig
->signal
== WSTOPSIG (*wstat
))
1639 debug_printf ("Not requeuing already queued non-RT signal %d"
1648 p_sig
= xmalloc (sizeof (*p_sig
));
1649 p_sig
->prev
= lwp
->pending_signals_to_report
;
1650 p_sig
->signal
= WSTOPSIG (*wstat
);
1651 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1652 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1655 lwp
->pending_signals_to_report
= p_sig
;
1658 /* Dequeue one signal from the "signals to report later when out of
1659 the jump pad" list. */
1662 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1664 if (lwp
->pending_signals_to_report
!= NULL
)
1666 struct pending_signals
**p_sig
;
1668 p_sig
= &lwp
->pending_signals_to_report
;
1669 while ((*p_sig
)->prev
!= NULL
)
1670 p_sig
= &(*p_sig
)->prev
;
1672 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1673 if ((*p_sig
)->info
.si_signo
!= 0)
1674 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1680 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1681 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1685 struct pending_signals
*sig
;
1687 for (sig
= lwp
->pending_signals_to_report
;
1690 debug_printf (" Still queued %d\n",
1693 debug_printf (" (no more queued signals)\n");
1702 /* Arrange for a breakpoint to be hit again later. We don't keep the
1703 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1704 will handle the current event, eventually we will resume this LWP,
1705 and this breakpoint will trap again. */
1708 cancel_breakpoint (struct lwp_info
*lwp
)
1710 struct thread_info
*saved_inferior
;
1712 /* There's nothing to do if we don't support breakpoints. */
1713 if (!supports_breakpoints ())
1716 /* breakpoint_at reads from current inferior. */
1717 saved_inferior
= current_inferior
;
1718 current_inferior
= get_lwp_thread (lwp
);
1720 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1723 debug_printf ("CB: Push back breakpoint for %s\n",
1724 target_pid_to_str (ptid_of (lwp
)));
1726 /* Back up the PC if necessary. */
1727 if (the_low_target
.decr_pc_after_break
)
1729 struct regcache
*regcache
1730 = get_thread_regcache (current_inferior
, 1);
1731 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1734 current_inferior
= saved_inferior
;
1740 debug_printf ("CB: No breakpoint found at %s for [%s]\n",
1741 paddress (lwp
->stop_pc
),
1742 target_pid_to_str (ptid_of (lwp
)));
1745 current_inferior
= saved_inferior
;
1749 /* When the event-loop is doing a step-over, this points at the thread
1751 ptid_t step_over_bkpt
;
1753 /* Wait for an event from child PID. If PID is -1, wait for any
1754 child. Store the stop status through the status pointer WSTAT.
1755 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1756 event was found and OPTIONS contains WNOHANG. Return the PID of
1757 the stopped child and update current_inferior otherwise. */
1760 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1762 struct lwp_info
*event_child
, *requested_child
;
1766 requested_child
= NULL
;
1768 /* Check for a lwp with a pending status. */
1770 if (ptid_equal (ptid
, minus_one_ptid
) || ptid_is_pid (ptid
))
1772 event_child
= (struct lwp_info
*)
1773 find_inferior (&all_lwps
, status_pending_p_callback
, &ptid
);
1774 if (debug_threads
&& event_child
)
1775 debug_printf ("Got a pending child %ld\n", lwpid_of (event_child
));
1779 requested_child
= find_lwp_pid (ptid
);
1781 if (stopping_threads
== NOT_STOPPING_THREADS
1782 && requested_child
->status_pending_p
1783 && requested_child
->collecting_fast_tracepoint
)
1785 enqueue_one_deferred_signal (requested_child
,
1786 &requested_child
->status_pending
);
1787 requested_child
->status_pending_p
= 0;
1788 requested_child
->status_pending
= 0;
1789 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1792 if (requested_child
->suspended
1793 && requested_child
->status_pending_p
)
1794 fatal ("requesting an event out of a suspended child?");
1796 if (requested_child
->status_pending_p
)
1797 event_child
= requested_child
;
1800 if (event_child
!= NULL
)
1803 debug_printf ("Got an event from pending child %ld (%04x)\n",
1804 lwpid_of (event_child
), event_child
->status_pending
);
1805 *wstat
= event_child
->status_pending
;
1806 event_child
->status_pending_p
= 0;
1807 event_child
->status_pending
= 0;
1808 current_inferior
= get_lwp_thread (event_child
);
1809 return lwpid_of (event_child
);
1812 if (ptid_is_pid (ptid
))
1814 /* A request to wait for a specific tgid. This is not possible
1815 with waitpid, so instead, we wait for any child, and leave
1816 children we're not interested in right now with a pending
1817 status to report later. */
1818 wait_ptid
= minus_one_ptid
;
1823 /* We only enter this loop if no process has a pending wait status. Thus
1824 any action taken in response to a wait status inside this loop is
1825 responding as soon as we detect the status, not after any pending
1829 event_child
= linux_wait_for_lwp (wait_ptid
, wstat
, options
);
1831 if ((options
& WNOHANG
) && event_child
== NULL
)
1834 debug_printf ("WNOHANG set, no event found\n");
1838 if (event_child
== NULL
)
1839 error ("event from unknown child");
1841 if (ptid_is_pid (ptid
)
1842 && ptid_get_pid (ptid
) != ptid_get_pid (ptid_of (event_child
)))
1844 if (! WIFSTOPPED (*wstat
))
1845 mark_lwp_dead (event_child
, *wstat
);
1848 event_child
->status_pending_p
= 1;
1849 event_child
->status_pending
= *wstat
;
1854 current_inferior
= get_lwp_thread (event_child
);
1856 /* Check for thread exit. */
1857 if (! WIFSTOPPED (*wstat
))
1860 debug_printf ("LWP %ld exiting\n", lwpid_of (event_child
));
1862 /* If the last thread is exiting, just return. */
1863 if (last_thread_of_process_p (current_inferior
))
1866 debug_printf ("LWP %ld is last lwp of process\n",
1867 lwpid_of (event_child
));
1868 return lwpid_of (event_child
);
1873 current_inferior
= get_first_thread ();
1875 debug_printf ("Current inferior is now %ld\n",
1876 lwpid_of (get_thread_lwp (current_inferior
)));
1880 current_inferior
= NULL
;
1882 debug_printf ("Current inferior is now <NULL>\n");
1885 /* If we were waiting for this particular child to do something...
1886 well, it did something. */
1887 if (requested_child
!= NULL
)
1889 int lwpid
= lwpid_of (event_child
);
1891 /* Cancel the step-over operation --- the thread that
1892 started it is gone. */
1893 if (finish_step_over (event_child
))
1894 unstop_all_lwps (1, event_child
);
1895 delete_lwp (event_child
);
1899 delete_lwp (event_child
);
1901 /* Wait for a more interesting event. */
1905 if (event_child
->must_set_ptrace_flags
)
1907 linux_enable_event_reporting (lwpid_of (event_child
));
1908 event_child
->must_set_ptrace_flags
= 0;
1911 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
1912 && *wstat
>> 16 != 0)
1914 handle_extended_wait (event_child
, *wstat
);
1918 if (WIFSTOPPED (*wstat
)
1919 && WSTOPSIG (*wstat
) == SIGSTOP
1920 && event_child
->stop_expected
)
1925 debug_printf ("Expected stop.\n");
1926 event_child
->stop_expected
= 0;
1928 should_stop
= (current_inferior
->last_resume_kind
== resume_stop
1929 || stopping_threads
!= NOT_STOPPING_THREADS
);
1933 linux_resume_one_lwp (event_child
,
1934 event_child
->stepping
, 0, NULL
);
1939 return lwpid_of (event_child
);
1946 /* Count the LWP's that have had events. */
1949 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
1951 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1952 struct thread_info
*thread
= get_lwp_thread (lp
);
1955 gdb_assert (count
!= NULL
);
1957 /* Count only resumed LWPs that have a SIGTRAP event pending that
1958 should be reported to GDB. */
1959 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1960 && thread
->last_resume_kind
!= resume_stop
1961 && lp
->status_pending_p
1962 && WIFSTOPPED (lp
->status_pending
)
1963 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
1964 && !breakpoint_inserted_here (lp
->stop_pc
))
1970 /* Select the LWP (if any) that is currently being single-stepped. */
1973 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1975 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1976 struct thread_info
*thread
= get_lwp_thread (lp
);
1978 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
1979 && thread
->last_resume_kind
== resume_step
1980 && lp
->status_pending_p
)
1986 /* Select the Nth LWP that has had a SIGTRAP event that should be
1990 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
1992 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
1993 struct thread_info
*thread
= get_lwp_thread (lp
);
1994 int *selector
= data
;
1996 gdb_assert (selector
!= NULL
);
1998 /* Select only resumed LWPs that have a SIGTRAP event pending. */
1999 if (thread
->last_resume_kind
!= resume_stop
2000 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2001 && lp
->status_pending_p
2002 && WIFSTOPPED (lp
->status_pending
)
2003 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2004 && !breakpoint_inserted_here (lp
->stop_pc
))
2005 if ((*selector
)-- == 0)
2012 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2014 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2015 struct thread_info
*thread
= get_lwp_thread (lp
);
2016 struct lwp_info
*event_lp
= data
;
2018 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2022 /* If a LWP other than the LWP that we're reporting an event for has
2023 hit a GDB breakpoint (as opposed to some random trap signal),
2024 then just arrange for it to hit it again later. We don't keep
2025 the SIGTRAP status and don't forward the SIGTRAP signal to the
2026 LWP. We will handle the current event, eventually we will resume
2027 all LWPs, and this one will get its breakpoint trap again.
2029 If we do not do this, then we run the risk that the user will
2030 delete or disable the breakpoint, but the LWP will have already
2033 if (thread
->last_resume_kind
!= resume_stop
2034 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2035 && lp
->status_pending_p
2036 && WIFSTOPPED (lp
->status_pending
)
2037 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2039 && !lp
->stopped_by_watchpoint
2040 && cancel_breakpoint (lp
))
2041 /* Throw away the SIGTRAP. */
2042 lp
->status_pending_p
= 0;
2048 linux_cancel_breakpoints (void)
2050 find_inferior (&all_lwps
, cancel_breakpoints_callback
, NULL
);
2053 /* Select one LWP out of those that have events pending. */
2056 select_event_lwp (struct lwp_info
**orig_lp
)
2059 int random_selector
;
2060 struct lwp_info
*event_lp
;
2062 /* Give preference to any LWP that is being single-stepped. */
2064 = (struct lwp_info
*) find_inferior (&all_lwps
,
2065 select_singlestep_lwp_callback
, NULL
);
2066 if (event_lp
!= NULL
)
2069 debug_printf ("SEL: Select single-step %s\n",
2070 target_pid_to_str (ptid_of (event_lp
)));
2074 /* No single-stepping LWP. Select one at random, out of those
2075 which have had SIGTRAP events. */
2077 /* First see how many SIGTRAP events we have. */
2078 find_inferior (&all_lwps
, count_events_callback
, &num_events
);
2080 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2081 random_selector
= (int)
2082 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2084 if (debug_threads
&& num_events
> 1)
2085 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2086 num_events
, random_selector
);
2088 event_lp
= (struct lwp_info
*) find_inferior (&all_lwps
,
2089 select_event_lwp_callback
,
2093 if (event_lp
!= NULL
)
2095 /* Switch the event LWP. */
2096 *orig_lp
= event_lp
;
2100 /* Decrement the suspend count of an LWP. */
2103 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2105 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2107 /* Ignore EXCEPT. */
2113 gdb_assert (lwp
->suspended
>= 0);
2117 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2121 unsuspend_all_lwps (struct lwp_info
*except
)
2123 find_inferior (&all_lwps
, unsuspend_one_lwp
, except
);
2126 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2127 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2129 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2130 static ptid_t
linux_wait_1 (ptid_t ptid
,
2131 struct target_waitstatus
*ourstatus
,
2132 int target_options
);
2134 /* Stabilize threads (move out of jump pads).
2136 If a thread is midway collecting a fast tracepoint, we need to
2137 finish the collection and move it out of the jump pad before
2138 reporting the signal.
2140 This avoids recursion while collecting (when a signal arrives
2141 midway, and the signal handler itself collects), which would trash
2142 the trace buffer. In case the user set a breakpoint in a signal
2143 handler, this avoids the backtrace showing the jump pad, etc..
2144 Most importantly, there are certain things we can't do safely if
2145 threads are stopped in a jump pad (or in its callee's). For
2148 - starting a new trace run. A thread still collecting the
2149 previous run, could trash the trace buffer when resumed. The trace
2150 buffer control structures would have been reset but the thread had
2151 no way to tell. The thread could even midway memcpy'ing to the
2152 buffer, which would mean that when resumed, it would clobber the
2153 trace buffer that had been set for a new run.
2155 - we can't rewrite/reuse the jump pads for new tracepoints
2156 safely. Say you do tstart while a thread is stopped midway while
2157 collecting. When the thread is later resumed, it finishes the
2158 collection, and returns to the jump pad, to execute the original
2159 instruction that was under the tracepoint jump at the time the
2160 older run had been started. If the jump pad had been rewritten
2161 since for something else in the new run, the thread would now
2162 execute the wrong / random instructions. */
2165 linux_stabilize_threads (void)
2167 struct thread_info
*save_inferior
;
2168 struct lwp_info
*lwp_stuck
;
2171 = (struct lwp_info
*) find_inferior (&all_lwps
,
2172 stuck_in_jump_pad_callback
, NULL
);
2173 if (lwp_stuck
!= NULL
)
2176 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2177 lwpid_of (lwp_stuck
));
2181 save_inferior
= current_inferior
;
2183 stabilizing_threads
= 1;
2186 for_each_inferior (&all_lwps
, move_out_of_jump_pad_callback
);
2188 /* Loop until all are stopped out of the jump pads. */
2189 while (find_inferior (&all_lwps
, lwp_running
, NULL
) != NULL
)
2191 struct target_waitstatus ourstatus
;
2192 struct lwp_info
*lwp
;
2195 /* Note that we go through the full wait even loop. While
2196 moving threads out of jump pad, we need to be able to step
2197 over internal breakpoints and such. */
2198 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2200 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2202 lwp
= get_thread_lwp (current_inferior
);
2207 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2208 || current_inferior
->last_resume_kind
== resume_stop
)
2210 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2211 enqueue_one_deferred_signal (lwp
, &wstat
);
2216 find_inferior (&all_lwps
, unsuspend_one_lwp
, NULL
);
2218 stabilizing_threads
= 0;
2220 current_inferior
= save_inferior
;
2225 = (struct lwp_info
*) find_inferior (&all_lwps
,
2226 stuck_in_jump_pad_callback
, NULL
);
2227 if (lwp_stuck
!= NULL
)
2228 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2229 lwpid_of (lwp_stuck
));
2233 /* Wait for process, returns status. */
2236 linux_wait_1 (ptid_t ptid
,
2237 struct target_waitstatus
*ourstatus
, int target_options
)
2240 struct lwp_info
*event_child
;
2243 int step_over_finished
;
2244 int bp_explains_trap
;
2245 int maybe_internal_trap
;
2253 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2256 /* Translate generic target options into linux options. */
2258 if (target_options
& TARGET_WNOHANG
)
2262 bp_explains_trap
= 0;
2265 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2267 /* If we were only supposed to resume one thread, only wait for
2268 that thread - if it's still alive. If it died, however - which
2269 can happen if we're coming from the thread death case below -
2270 then we need to make sure we restart the other threads. We could
2271 pick a thread at random or restart all; restarting all is less
2274 && !ptid_equal (cont_thread
, null_ptid
)
2275 && !ptid_equal (cont_thread
, minus_one_ptid
))
2277 struct thread_info
*thread
;
2279 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2282 /* No stepping, no signal - unless one is pending already, of course. */
2285 struct thread_resume resume_info
;
2286 resume_info
.thread
= minus_one_ptid
;
2287 resume_info
.kind
= resume_continue
;
2288 resume_info
.sig
= 0;
2289 linux_resume (&resume_info
, 1);
2295 if (ptid_equal (step_over_bkpt
, null_ptid
))
2296 pid
= linux_wait_for_event (ptid
, &w
, options
);
2300 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2301 target_pid_to_str (step_over_bkpt
));
2302 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2305 if (pid
== 0) /* only if TARGET_WNOHANG */
2309 debug_printf ("linux_wait_1 ret = null_ptid\n");
2315 event_child
= get_thread_lwp (current_inferior
);
2317 /* If we are waiting for a particular child, and it exited,
2318 linux_wait_for_event will return its exit status. Similarly if
2319 the last child exited. If this is not the last child, however,
2320 do not report it as exited until there is a 'thread exited' response
2321 available in the remote protocol. Instead, just wait for another event.
2322 This should be safe, because if the thread crashed we will already
2323 have reported the termination signal to GDB; that should stop any
2324 in-progress stepping operations, etc.
2326 Report the exit status of the last thread to exit. This matches
2327 LinuxThreads' behavior. */
2329 if (last_thread_of_process_p (current_inferior
))
2331 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2335 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2336 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2340 debug_printf ("linux_wait_1 ret = %s, exited with "
2342 target_pid_to_str (ptid_of (event_child
)),
2349 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2350 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2354 debug_printf ("linux_wait_1 ret = %s, terminated with "
2356 target_pid_to_str (ptid_of (event_child
)),
2362 return ptid_of (event_child
);
2367 if (!WIFSTOPPED (w
))
2371 /* If this event was not handled before, and is not a SIGTRAP, we
2372 report it. SIGILL and SIGSEGV are also treated as traps in case
2373 a breakpoint is inserted at the current PC. If this target does
2374 not support internal breakpoints at all, we also report the
2375 SIGTRAP without further processing; it's of no concern to us. */
2377 = (supports_breakpoints ()
2378 && (WSTOPSIG (w
) == SIGTRAP
2379 || ((WSTOPSIG (w
) == SIGILL
2380 || WSTOPSIG (w
) == SIGSEGV
)
2381 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2383 if (maybe_internal_trap
)
2385 /* Handle anything that requires bookkeeping before deciding to
2386 report the event or continue waiting. */
2388 /* First check if we can explain the SIGTRAP with an internal
2389 breakpoint, or if we should possibly report the event to GDB.
2390 Do this before anything that may remove or insert a
2392 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2394 /* We have a SIGTRAP, possibly a step-over dance has just
2395 finished. If so, tweak the state machine accordingly,
2396 reinsert breakpoints and delete any reinsert (software
2397 single-step) breakpoints. */
2398 step_over_finished
= finish_step_over (event_child
);
2400 /* Now invoke the callbacks of any internal breakpoints there. */
2401 check_breakpoints (event_child
->stop_pc
);
2403 /* Handle tracepoint data collecting. This may overflow the
2404 trace buffer, and cause a tracing stop, removing
2406 trace_event
= handle_tracepoints (event_child
);
2408 if (bp_explains_trap
)
2410 /* If we stepped or ran into an internal breakpoint, we've
2411 already handled it. So next time we resume (from this
2412 PC), we should step over it. */
2414 debug_printf ("Hit a gdbserver breakpoint.\n");
2416 if (breakpoint_here (event_child
->stop_pc
))
2417 event_child
->need_step_over
= 1;
2422 /* We have some other signal, possibly a step-over dance was in
2423 progress, and it should be cancelled too. */
2424 step_over_finished
= finish_step_over (event_child
);
2427 /* We have all the data we need. Either report the event to GDB, or
2428 resume threads and keep waiting for more. */
2430 /* If we're collecting a fast tracepoint, finish the collection and
2431 move out of the jump pad before delivering a signal. See
2432 linux_stabilize_threads. */
2435 && WSTOPSIG (w
) != SIGTRAP
2436 && supports_fast_tracepoints ()
2437 && agent_loaded_p ())
2440 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2441 "to defer or adjust it.\n",
2442 WSTOPSIG (w
), lwpid_of (event_child
));
2444 /* Allow debugging the jump pad itself. */
2445 if (current_inferior
->last_resume_kind
!= resume_step
2446 && maybe_move_out_of_jump_pad (event_child
, &w
))
2448 enqueue_one_deferred_signal (event_child
, &w
);
2451 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2452 WSTOPSIG (w
), lwpid_of (event_child
));
2454 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2459 if (event_child
->collecting_fast_tracepoint
)
2462 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
2463 "Check if we're already there.\n",
2464 lwpid_of (event_child
),
2465 event_child
->collecting_fast_tracepoint
);
2469 event_child
->collecting_fast_tracepoint
2470 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2472 if (event_child
->collecting_fast_tracepoint
!= 1)
2474 /* No longer need this breakpoint. */
2475 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2478 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
2479 "stopping all threads momentarily.\n");
2481 /* Other running threads could hit this breakpoint.
2482 We don't handle moribund locations like GDB does,
2483 instead we always pause all threads when removing
2484 breakpoints, so that any step-over or
2485 decr_pc_after_break adjustment is always taken
2486 care of while the breakpoint is still
2488 stop_all_lwps (1, event_child
);
2489 cancel_breakpoints ();
2491 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2492 event_child
->exit_jump_pad_bkpt
= NULL
;
2494 unstop_all_lwps (1, event_child
);
2496 gdb_assert (event_child
->suspended
>= 0);
2500 if (event_child
->collecting_fast_tracepoint
== 0)
2503 debug_printf ("fast tracepoint finished "
2504 "collecting successfully.\n");
2506 /* We may have a deferred signal to report. */
2507 if (dequeue_one_deferred_signal (event_child
, &w
))
2510 debug_printf ("dequeued one signal.\n");
2515 debug_printf ("no deferred signals.\n");
2517 if (stabilizing_threads
)
2519 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2520 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2524 debug_printf ("linux_wait_1 ret = %s, stopped "
2525 "while stabilizing threads\n",
2526 target_pid_to_str (ptid_of (event_child
)));
2530 return ptid_of (event_child
);
2536 /* Check whether GDB would be interested in this event. */
2538 /* If GDB is not interested in this signal, don't stop other
2539 threads, and don't report it to GDB. Just resume the inferior
2540 right away. We do this for threading-related signals as well as
2541 any that GDB specifically requested we ignore. But never ignore
2542 SIGSTOP if we sent it ourselves, and do not ignore signals when
2543 stepping - they may require special handling to skip the signal
2545 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2548 && current_inferior
->last_resume_kind
!= resume_step
2550 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2551 (current_process ()->private->thread_db
!= NULL
2552 && (WSTOPSIG (w
) == __SIGRTMIN
2553 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2556 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2557 && !(WSTOPSIG (w
) == SIGSTOP
2558 && current_inferior
->last_resume_kind
== resume_stop
))))
2560 siginfo_t info
, *info_p
;
2563 debug_printf ("Ignored signal %d for LWP %ld.\n",
2564 WSTOPSIG (w
), lwpid_of (event_child
));
2566 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
),
2567 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2571 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2572 WSTOPSIG (w
), info_p
);
2576 /* Note that all addresses are always "out of the step range" when
2577 there's no range to begin with. */
2578 in_step_range
= lwp_in_step_range (event_child
);
2580 /* If GDB wanted this thread to single step, and the thread is out
2581 of the step range, we always want to report the SIGTRAP, and let
2582 GDB handle it. Watchpoints should always be reported. So should
2583 signals we can't explain. A SIGTRAP we can't explain could be a
2584 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2585 do, we're be able to handle GDB breakpoints on top of internal
2586 breakpoints, by handling the internal breakpoint and still
2587 reporting the event to GDB. If we don't, we're out of luck, GDB
2588 won't see the breakpoint hit. */
2589 report_to_gdb
= (!maybe_internal_trap
2590 || (current_inferior
->last_resume_kind
== resume_step
2592 || event_child
->stopped_by_watchpoint
2593 || (!step_over_finished
&& !in_step_range
2594 && !bp_explains_trap
&& !trace_event
)
2595 || (gdb_breakpoint_here (event_child
->stop_pc
)
2596 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2597 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2599 run_breakpoint_commands (event_child
->stop_pc
);
2601 /* We found no reason GDB would want us to stop. We either hit one
2602 of our own breakpoints, or finished an internal step GDB
2603 shouldn't know about. */
2608 if (bp_explains_trap
)
2609 debug_printf ("Hit a gdbserver breakpoint.\n");
2610 if (step_over_finished
)
2611 debug_printf ("Step-over finished.\n");
2613 debug_printf ("Tracepoint event.\n");
2614 if (lwp_in_step_range (event_child
))
2615 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
2616 paddress (event_child
->stop_pc
),
2617 paddress (event_child
->step_range_start
),
2618 paddress (event_child
->step_range_end
));
2621 /* We're not reporting this breakpoint to GDB, so apply the
2622 decr_pc_after_break adjustment to the inferior's regcache
2625 if (the_low_target
.set_pc
!= NULL
)
2627 struct regcache
*regcache
2628 = get_thread_regcache (get_lwp_thread (event_child
), 1);
2629 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2632 /* We may have finished stepping over a breakpoint. If so,
2633 we've stopped and suspended all LWPs momentarily except the
2634 stepping one. This is where we resume them all again. We're
2635 going to keep waiting, so use proceed, which handles stepping
2636 over the next breakpoint. */
2638 debug_printf ("proceeding all threads.\n");
2640 if (step_over_finished
)
2641 unsuspend_all_lwps (event_child
);
2643 proceed_all_lwps ();
2649 if (current_inferior
->last_resume_kind
== resume_step
)
2651 if (event_child
->step_range_start
== event_child
->step_range_end
)
2652 debug_printf ("GDB wanted to single-step, reporting event.\n");
2653 else if (!lwp_in_step_range (event_child
))
2654 debug_printf ("Out of step range, reporting event.\n");
2656 if (event_child
->stopped_by_watchpoint
)
2657 debug_printf ("Stopped by watchpoint.\n");
2658 if (gdb_breakpoint_here (event_child
->stop_pc
))
2659 debug_printf ("Stopped by GDB breakpoint.\n");
2661 debug_printf ("Hit a non-gdbserver trap event.\n");
2664 /* Alright, we're going to report a stop. */
2666 if (!non_stop
&& !stabilizing_threads
)
2668 /* In all-stop, stop all threads. */
2669 stop_all_lwps (0, NULL
);
2671 /* If we're not waiting for a specific LWP, choose an event LWP
2672 from among those that have had events. Giving equal priority
2673 to all LWPs that have had events helps prevent
2675 if (ptid_equal (ptid
, minus_one_ptid
))
2677 event_child
->status_pending_p
= 1;
2678 event_child
->status_pending
= w
;
2680 select_event_lwp (&event_child
);
2682 /* current_inferior and event_child must stay in sync. */
2683 current_inferior
= get_lwp_thread (event_child
);
2685 event_child
->status_pending_p
= 0;
2686 w
= event_child
->status_pending
;
2689 /* Now that we've selected our final event LWP, cancel any
2690 breakpoints in other LWPs that have hit a GDB breakpoint.
2691 See the comment in cancel_breakpoints_callback to find out
2693 find_inferior (&all_lwps
, cancel_breakpoints_callback
, event_child
);
2695 /* If we were going a step-over, all other threads but the stepping one
2696 had been paused in start_step_over, with their suspend counts
2697 incremented. We don't want to do a full unstop/unpause, because we're
2698 in all-stop mode (so we want threads stopped), but we still need to
2699 unsuspend the other threads, to decrement their `suspended' count
2701 if (step_over_finished
)
2702 unsuspend_all_lwps (event_child
);
2704 /* Stabilize threads (move out of jump pads). */
2705 stabilize_threads ();
2709 /* If we just finished a step-over, then all threads had been
2710 momentarily paused. In all-stop, that's fine, we want
2711 threads stopped by now anyway. In non-stop, we need to
2712 re-resume threads that GDB wanted to be running. */
2713 if (step_over_finished
)
2714 unstop_all_lwps (1, event_child
);
2717 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2719 if (current_inferior
->last_resume_kind
== resume_stop
2720 && WSTOPSIG (w
) == SIGSTOP
)
2722 /* A thread that has been requested to stop by GDB with vCont;t,
2723 and it stopped cleanly, so report as SIG0. The use of
2724 SIGSTOP is an implementation detail. */
2725 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2727 else if (current_inferior
->last_resume_kind
== resume_stop
2728 && WSTOPSIG (w
) != SIGSTOP
)
2730 /* A thread that has been requested to stop by GDB with vCont;t,
2731 but, it stopped for other reasons. */
2732 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2736 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2739 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2743 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
2744 target_pid_to_str (ptid_of (event_child
)),
2745 ourstatus
->kind
, ourstatus
->value
.sig
);
2749 return ptid_of (event_child
);
2752 /* Get rid of any pending event in the pipe. */
2754 async_file_flush (void)
2760 ret
= read (linux_event_pipe
[0], &buf
, 1);
2761 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2764 /* Put something in the pipe, so the event loop wakes up. */
2766 async_file_mark (void)
2770 async_file_flush ();
2773 ret
= write (linux_event_pipe
[1], "+", 1);
2774 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2776 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2777 be awakened anyway. */
2781 linux_wait (ptid_t ptid
,
2782 struct target_waitstatus
*ourstatus
, int target_options
)
2786 /* Flush the async file first. */
2787 if (target_is_async_p ())
2788 async_file_flush ();
2790 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
2792 /* If at least one stop was reported, there may be more. A single
2793 SIGCHLD can signal more than one child stop. */
2794 if (target_is_async_p ()
2795 && (target_options
& TARGET_WNOHANG
) != 0
2796 && !ptid_equal (event_ptid
, null_ptid
))
2802 /* Send a signal to an LWP. */
2805 kill_lwp (unsigned long lwpid
, int signo
)
2807 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2808 fails, then we are not using nptl threads and we should be using kill. */
2812 static int tkill_failed
;
2819 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2820 if (errno
!= ENOSYS
)
2827 return kill (lwpid
, signo
);
2831 linux_stop_lwp (struct lwp_info
*lwp
)
2837 send_sigstop (struct lwp_info
*lwp
)
2841 pid
= lwpid_of (lwp
);
2843 /* If we already have a pending stop signal for this process, don't
2845 if (lwp
->stop_expected
)
2848 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
2854 debug_printf ("Sending sigstop to lwp %d\n", pid
);
2856 lwp
->stop_expected
= 1;
2857 kill_lwp (pid
, SIGSTOP
);
2861 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
2863 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2865 /* Ignore EXCEPT. */
2876 /* Increment the suspend count of an LWP, and stop it, if not stopped
2879 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
2882 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2884 /* Ignore EXCEPT. */
2890 return send_sigstop_callback (entry
, except
);
2894 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
2896 /* It's dead, really. */
2899 /* Store the exit status for later. */
2900 lwp
->status_pending_p
= 1;
2901 lwp
->status_pending
= wstat
;
2903 /* Prevent trying to stop it. */
2906 /* No further stops are expected from a dead lwp. */
2907 lwp
->stop_expected
= 0;
2911 wait_for_sigstop (struct inferior_list_entry
*entry
)
2913 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2914 struct thread_info
*saved_inferior
;
2923 debug_printf ("wait_for_sigstop: LWP %ld already stopped\n",
2928 saved_inferior
= current_inferior
;
2929 if (saved_inferior
!= NULL
)
2930 saved_tid
= saved_inferior
->entry
.id
;
2932 saved_tid
= null_ptid
; /* avoid bogus unused warning */
2934 ptid
= lwp
->entry
.id
;
2937 debug_printf ("wait_for_sigstop: pulling one event\n");
2939 pid
= linux_wait_for_event (ptid
, &wstat
, __WALL
);
2941 /* If we stopped with a non-SIGSTOP signal, save it for later
2942 and record the pending SIGSTOP. If the process exited, just
2944 if (WIFSTOPPED (wstat
))
2947 debug_printf ("LWP %ld stopped with signal %d\n",
2948 lwpid_of (lwp
), WSTOPSIG (wstat
));
2950 if (WSTOPSIG (wstat
) != SIGSTOP
)
2953 debug_printf ("LWP %ld stopped with non-sigstop status %06x\n",
2954 lwpid_of (lwp
), wstat
);
2956 lwp
->status_pending_p
= 1;
2957 lwp
->status_pending
= wstat
;
2963 debug_printf ("Process %d exited while stopping LWPs\n", pid
);
2965 lwp
= find_lwp_pid (pid_to_ptid (pid
));
2968 /* Leave this status pending for the next time we're able to
2969 report it. In the mean time, we'll report this lwp as
2970 dead to GDB, so GDB doesn't try to read registers and
2971 memory from it. This can only happen if this was the
2972 last thread of the process; otherwise, PID is removed
2973 from the thread tables before linux_wait_for_event
2975 mark_lwp_dead (lwp
, wstat
);
2979 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
2980 current_inferior
= saved_inferior
;
2984 debug_printf ("Previously current thread died.\n");
2988 /* We can't change the current inferior behind GDB's back,
2989 otherwise, a subsequent command may apply to the wrong
2991 current_inferior
= NULL
;
2995 /* Set a valid thread as current. */
2996 set_desired_inferior (0);
3001 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3002 move it out, because we need to report the stop event to GDB. For
3003 example, if the user puts a breakpoint in the jump pad, it's
3004 because she wants to debug it. */
3007 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3009 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3010 struct thread_info
*thread
= get_lwp_thread (lwp
);
3012 gdb_assert (lwp
->suspended
== 0);
3013 gdb_assert (lwp
->stopped
);
3015 /* Allow debugging the jump pad, gdb_collect, etc.. */
3016 return (supports_fast_tracepoints ()
3017 && agent_loaded_p ()
3018 && (gdb_breakpoint_here (lwp
->stop_pc
)
3019 || lwp
->stopped_by_watchpoint
3020 || thread
->last_resume_kind
== resume_step
)
3021 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3025 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3027 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3028 struct thread_info
*thread
= get_lwp_thread (lwp
);
3031 gdb_assert (lwp
->suspended
== 0);
3032 gdb_assert (lwp
->stopped
);
3034 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3036 /* Allow debugging the jump pad, gdb_collect, etc. */
3037 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3038 && !lwp
->stopped_by_watchpoint
3039 && thread
->last_resume_kind
!= resume_step
3040 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3043 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3048 lwp
->status_pending_p
= 0;
3049 enqueue_one_deferred_signal (lwp
, wstat
);
3052 debug_printf ("Signal %d for LWP %ld deferred "
3054 WSTOPSIG (*wstat
), lwpid_of (lwp
));
3057 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3064 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3066 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3075 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3076 If SUSPEND, then also increase the suspend count of every LWP,
3080 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3082 /* Should not be called recursively. */
3083 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3088 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3089 suspend
? "stop-and-suspend" : "stop",
3091 ? target_pid_to_str (ptid_of (except
))
3095 stopping_threads
= (suspend
3096 ? STOPPING_AND_SUSPENDING_THREADS
3097 : STOPPING_THREADS
);
3100 find_inferior (&all_lwps
, suspend_and_send_sigstop_callback
, except
);
3102 find_inferior (&all_lwps
, send_sigstop_callback
, except
);
3103 for_each_inferior (&all_lwps
, wait_for_sigstop
);
3104 stopping_threads
= NOT_STOPPING_THREADS
;
3108 debug_printf ("stop_all_lwps done, setting stopping_threads "
3109 "back to !stopping\n");
3114 /* Resume execution of the inferior process.
3115 If STEP is nonzero, single-step it.
3116 If SIGNAL is nonzero, give it that signal. */
3119 linux_resume_one_lwp (struct lwp_info
*lwp
,
3120 int step
, int signal
, siginfo_t
*info
)
3122 struct thread_info
*saved_inferior
;
3123 int fast_tp_collecting
;
3125 if (lwp
->stopped
== 0)
3128 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3130 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3132 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3133 user used the "jump" command, or "set $pc = foo"). */
3134 if (lwp
->stop_pc
!= get_pc (lwp
))
3136 /* Collecting 'while-stepping' actions doesn't make sense
3138 release_while_stepping_state_list (get_lwp_thread (lwp
));
3141 /* If we have pending signals or status, and a new signal, enqueue the
3142 signal. Also enqueue the signal if we are waiting to reinsert a
3143 breakpoint; it will be picked up again below. */
3145 && (lwp
->status_pending_p
3146 || lwp
->pending_signals
!= NULL
3147 || lwp
->bp_reinsert
!= 0
3148 || fast_tp_collecting
))
3150 struct pending_signals
*p_sig
;
3151 p_sig
= xmalloc (sizeof (*p_sig
));
3152 p_sig
->prev
= lwp
->pending_signals
;
3153 p_sig
->signal
= signal
;
3155 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3157 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3158 lwp
->pending_signals
= p_sig
;
3161 if (lwp
->status_pending_p
)
3164 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3165 " has pending status\n",
3166 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3167 lwp
->stop_expected
? "expected" : "not expected");
3171 saved_inferior
= current_inferior
;
3172 current_inferior
= get_lwp_thread (lwp
);
3175 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3176 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3177 lwp
->stop_expected
? "expected" : "not expected");
3179 /* This bit needs some thinking about. If we get a signal that
3180 we must report while a single-step reinsert is still pending,
3181 we often end up resuming the thread. It might be better to
3182 (ew) allow a stack of pending events; then we could be sure that
3183 the reinsert happened right away and not lose any signals.
3185 Making this stack would also shrink the window in which breakpoints are
3186 uninserted (see comment in linux_wait_for_lwp) but not enough for
3187 complete correctness, so it won't solve that problem. It may be
3188 worthwhile just to solve this one, however. */
3189 if (lwp
->bp_reinsert
!= 0)
3192 debug_printf (" pending reinsert at 0x%s\n",
3193 paddress (lwp
->bp_reinsert
));
3195 if (can_hardware_single_step ())
3197 if (fast_tp_collecting
== 0)
3200 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3202 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3209 /* Postpone any pending signal. It was enqueued above. */
3213 if (fast_tp_collecting
== 1)
3216 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3217 " (exit-jump-pad-bkpt)\n",
3220 /* Postpone any pending signal. It was enqueued above. */
3223 else if (fast_tp_collecting
== 2)
3226 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3227 " single-stepping\n",
3230 if (can_hardware_single_step ())
3233 fatal ("moving out of jump pad single-stepping"
3234 " not implemented on this target");
3236 /* Postpone any pending signal. It was enqueued above. */
3240 /* If we have while-stepping actions in this thread set it stepping.
3241 If we have a signal to deliver, it may or may not be set to
3242 SIG_IGN, we don't know. Assume so, and allow collecting
3243 while-stepping into a signal handler. A possible smart thing to
3244 do would be to set an internal breakpoint at the signal return
3245 address, continue, and carry on catching this while-stepping
3246 action only when that breakpoint is hit. A future
3248 if (get_lwp_thread (lwp
)->while_stepping
!= NULL
3249 && can_hardware_single_step ())
3252 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3257 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3259 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3260 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3261 debug_printf (" resuming from pc 0x%lx\n", (long) pc
);
3264 /* If we have pending signals, consume one unless we are trying to
3265 reinsert a breakpoint or we're trying to finish a fast tracepoint
3267 if (lwp
->pending_signals
!= NULL
3268 && lwp
->bp_reinsert
== 0
3269 && fast_tp_collecting
== 0)
3271 struct pending_signals
**p_sig
;
3273 p_sig
= &lwp
->pending_signals
;
3274 while ((*p_sig
)->prev
!= NULL
)
3275 p_sig
= &(*p_sig
)->prev
;
3277 signal
= (*p_sig
)->signal
;
3278 if ((*p_sig
)->info
.si_signo
!= 0)
3279 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
3286 if (the_low_target
.prepare_to_resume
!= NULL
)
3287 the_low_target
.prepare_to_resume (lwp
);
3289 regcache_invalidate_thread (get_lwp_thread (lwp
));
3292 lwp
->stopped_by_watchpoint
= 0;
3293 lwp
->stepping
= step
;
3294 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
),
3295 (PTRACE_TYPE_ARG3
) 0,
3296 /* Coerce to a uintptr_t first to avoid potential gcc warning
3297 of coercing an 8 byte integer to a 4 byte pointer. */
3298 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3300 current_inferior
= saved_inferior
;
3303 /* ESRCH from ptrace either means that the thread was already
3304 running (an error) or that it is gone (a race condition). If
3305 it's gone, we will get a notification the next time we wait,
3306 so we can ignore the error. We could differentiate these
3307 two, but it's tricky without waiting; the thread still exists
3308 as a zombie, so sending it signal 0 would succeed. So just
3313 perror_with_name ("ptrace");
3317 struct thread_resume_array
3319 struct thread_resume
*resume
;
3323 /* This function is called once per thread via find_inferior.
3324 ARG is a pointer to a thread_resume_array struct.
3325 We look up the thread specified by ENTRY in ARG, and mark the thread
3326 with a pointer to the appropriate resume request.
3328 This algorithm is O(threads * resume elements), but resume elements
3329 is small (and will remain small at least until GDB supports thread
3333 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3335 struct lwp_info
*lwp
;
3336 struct thread_info
*thread
;
3338 struct thread_resume_array
*r
;
3340 thread
= (struct thread_info
*) entry
;
3341 lwp
= get_thread_lwp (thread
);
3344 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3346 ptid_t ptid
= r
->resume
[ndx
].thread
;
3347 if (ptid_equal (ptid
, minus_one_ptid
)
3348 || ptid_equal (ptid
, entry
->id
)
3349 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3351 || (ptid_get_pid (ptid
) == pid_of (lwp
)
3352 && (ptid_is_pid (ptid
)
3353 || ptid_get_lwp (ptid
) == -1)))
3355 if (r
->resume
[ndx
].kind
== resume_stop
3356 && thread
->last_resume_kind
== resume_stop
)
3359 debug_printf ("already %s LWP %ld at GDB's request\n",
3360 (thread
->last_status
.kind
3361 == TARGET_WAITKIND_STOPPED
)
3369 lwp
->resume
= &r
->resume
[ndx
];
3370 thread
->last_resume_kind
= lwp
->resume
->kind
;
3372 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3373 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3375 /* If we had a deferred signal to report, dequeue one now.
3376 This can happen if LWP gets more than one signal while
3377 trying to get out of a jump pad. */
3379 && !lwp
->status_pending_p
3380 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3382 lwp
->status_pending_p
= 1;
3385 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3386 "leaving status pending.\n",
3387 WSTOPSIG (lwp
->status_pending
), lwpid_of (lwp
));
3394 /* No resume action for this thread. */
3400 /* find_inferior callback for linux_resume.
3401 Set *FLAG_P if this lwp has an interesting status pending. */
3404 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3406 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3408 /* LWPs which will not be resumed are not interesting, because
3409 we might not wait for them next time through linux_wait. */
3410 if (lwp
->resume
== NULL
)
3413 if (lwp
->status_pending_p
)
3414 * (int *) flag_p
= 1;
3419 /* Return 1 if this lwp that GDB wants running is stopped at an
3420 internal breakpoint that we need to step over. It assumes that any
3421 required STOP_PC adjustment has already been propagated to the
3422 inferior's regcache. */
3425 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3427 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3428 struct thread_info
*thread
;
3429 struct thread_info
*saved_inferior
;
3432 /* LWPs which will not be resumed are not interesting, because we
3433 might not wait for them next time through linux_wait. */
3438 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
3443 thread
= get_lwp_thread (lwp
);
3445 if (thread
->last_resume_kind
== resume_stop
)
3448 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
3454 gdb_assert (lwp
->suspended
>= 0);
3459 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
3464 if (!lwp
->need_step_over
)
3467 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (lwp
));
3470 if (lwp
->status_pending_p
)
3473 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
3479 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3483 /* If the PC has changed since we stopped, then don't do anything,
3484 and let the breakpoint/tracepoint be hit. This happens if, for
3485 instance, GDB handled the decr_pc_after_break subtraction itself,
3486 GDB is OOL stepping this thread, or the user has issued a "jump"
3487 command, or poked thread's registers herself. */
3488 if (pc
!= lwp
->stop_pc
)
3491 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
3492 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3493 lwpid_of (lwp
), paddress (lwp
->stop_pc
), paddress (pc
));
3495 lwp
->need_step_over
= 0;
3499 saved_inferior
= current_inferior
;
3500 current_inferior
= thread
;
3502 /* We can only step over breakpoints we know about. */
3503 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3505 /* Don't step over a breakpoint that GDB expects to hit
3506 though. If the condition is being evaluated on the target's side
3507 and it evaluate to false, step over this breakpoint as well. */
3508 if (gdb_breakpoint_here (pc
)
3509 && gdb_condition_true_at_breakpoint (pc
)
3510 && gdb_no_commands_at_breakpoint (pc
))
3513 debug_printf ("Need step over [LWP %ld]? yes, but found"
3514 " GDB breakpoint at 0x%s; skipping step over\n",
3515 lwpid_of (lwp
), paddress (pc
));
3517 current_inferior
= saved_inferior
;
3523 debug_printf ("Need step over [LWP %ld]? yes, "
3524 "found breakpoint at 0x%s\n",
3525 lwpid_of (lwp
), paddress (pc
));
3527 /* We've found an lwp that needs stepping over --- return 1 so
3528 that find_inferior stops looking. */
3529 current_inferior
= saved_inferior
;
3531 /* If the step over is cancelled, this is set again. */
3532 lwp
->need_step_over
= 0;
3537 current_inferior
= saved_inferior
;
3540 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
3542 lwpid_of (lwp
), paddress (pc
));
3547 /* Start a step-over operation on LWP. When LWP stopped at a
3548 breakpoint, to make progress, we need to remove the breakpoint out
3549 of the way. If we let other threads run while we do that, they may
3550 pass by the breakpoint location and miss hitting it. To avoid
3551 that, a step-over momentarily stops all threads while LWP is
3552 single-stepped while the breakpoint is temporarily uninserted from
3553 the inferior. When the single-step finishes, we reinsert the
3554 breakpoint, and let all threads that are supposed to be running,
3557 On targets that don't support hardware single-step, we don't
3558 currently support full software single-stepping. Instead, we only
3559 support stepping over the thread event breakpoint, by asking the
3560 low target where to place a reinsert breakpoint. Since this
3561 routine assumes the breakpoint being stepped over is a thread event
3562 breakpoint, it usually assumes the return address of the current
3563 function is a good enough place to set the reinsert breakpoint. */
3566 start_step_over (struct lwp_info
*lwp
)
3568 struct thread_info
*saved_inferior
;
3573 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
3576 stop_all_lwps (1, lwp
);
3577 gdb_assert (lwp
->suspended
== 0);
3580 debug_printf ("Done stopping all threads for step-over.\n");
3582 /* Note, we should always reach here with an already adjusted PC,
3583 either by GDB (if we're resuming due to GDB's request), or by our
3584 caller, if we just finished handling an internal breakpoint GDB
3585 shouldn't care about. */
3588 saved_inferior
= current_inferior
;
3589 current_inferior
= get_lwp_thread (lwp
);
3591 lwp
->bp_reinsert
= pc
;
3592 uninsert_breakpoints_at (pc
);
3593 uninsert_fast_tracepoint_jumps_at (pc
);
3595 if (can_hardware_single_step ())
3601 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3602 set_reinsert_breakpoint (raddr
);
3606 current_inferior
= saved_inferior
;
3608 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3610 /* Require next event from this LWP. */
3611 step_over_bkpt
= lwp
->entry
.id
;
3615 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3616 start_step_over, if still there, and delete any reinsert
3617 breakpoints we've set, on non hardware single-step targets. */
3620 finish_step_over (struct lwp_info
*lwp
)
3622 if (lwp
->bp_reinsert
!= 0)
3625 debug_printf ("Finished step over.\n");
3627 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3628 may be no breakpoint to reinsert there by now. */
3629 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3630 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3632 lwp
->bp_reinsert
= 0;
3634 /* Delete any software-single-step reinsert breakpoints. No
3635 longer needed. We don't have to worry about other threads
3636 hitting this trap, and later not being able to explain it,
3637 because we were stepping over a breakpoint, and we hold all
3638 threads but LWP stopped while doing that. */
3639 if (!can_hardware_single_step ())
3640 delete_reinsert_breakpoints ();
3642 step_over_bkpt
= null_ptid
;
3649 /* This function is called once per thread. We check the thread's resume
3650 request, which will tell us whether to resume, step, or leave the thread
3651 stopped; and what signal, if any, it should be sent.
3653 For threads which we aren't explicitly told otherwise, we preserve
3654 the stepping flag; this is used for stepping over gdbserver-placed
3657 If pending_flags was set in any thread, we queue any needed
3658 signals, since we won't actually resume. We already have a pending
3659 event to report, so we don't need to preserve any step requests;
3660 they should be re-issued if necessary. */
3663 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3665 struct lwp_info
*lwp
;
3666 struct thread_info
*thread
;
3668 int leave_all_stopped
= * (int *) arg
;
3671 thread
= (struct thread_info
*) entry
;
3672 lwp
= get_thread_lwp (thread
);
3674 if (lwp
->resume
== NULL
)
3677 if (lwp
->resume
->kind
== resume_stop
)
3680 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (lwp
));
3685 debug_printf ("stopping LWP %ld\n", lwpid_of (lwp
));
3687 /* Stop the thread, and wait for the event asynchronously,
3688 through the event loop. */
3694 debug_printf ("already stopped LWP %ld\n",
3697 /* The LWP may have been stopped in an internal event that
3698 was not meant to be notified back to GDB (e.g., gdbserver
3699 breakpoint), so we should be reporting a stop event in
3702 /* If the thread already has a pending SIGSTOP, this is a
3703 no-op. Otherwise, something later will presumably resume
3704 the thread and this will cause it to cancel any pending
3705 operation, due to last_resume_kind == resume_stop. If
3706 the thread already has a pending status to report, we
3707 will still report it the next time we wait - see
3708 status_pending_p_callback. */
3710 /* If we already have a pending signal to report, then
3711 there's no need to queue a SIGSTOP, as this means we're
3712 midway through moving the LWP out of the jumppad, and we
3713 will report the pending signal as soon as that is
3715 if (lwp
->pending_signals_to_report
== NULL
)
3719 /* For stop requests, we're done. */
3721 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3725 /* If this thread which is about to be resumed has a pending status,
3726 then don't resume any threads - we can just report the pending
3727 status. Make sure to queue any signals that would otherwise be
3728 sent. In all-stop mode, we do this decision based on if *any*
3729 thread has a pending status. If there's a thread that needs the
3730 step-over-breakpoint dance, then don't resume any other thread
3731 but that particular one. */
3732 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3737 debug_printf ("resuming LWP %ld\n", lwpid_of (lwp
));
3739 step
= (lwp
->resume
->kind
== resume_step
);
3740 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3745 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (lwp
));
3747 /* If we have a new signal, enqueue the signal. */
3748 if (lwp
->resume
->sig
!= 0)
3750 struct pending_signals
*p_sig
;
3751 p_sig
= xmalloc (sizeof (*p_sig
));
3752 p_sig
->prev
= lwp
->pending_signals
;
3753 p_sig
->signal
= lwp
->resume
->sig
;
3754 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3756 /* If this is the same signal we were previously stopped by,
3757 make sure to queue its siginfo. We can ignore the return
3758 value of ptrace; if it fails, we'll skip
3759 PTRACE_SETSIGINFO. */
3760 if (WIFSTOPPED (lwp
->last_status
)
3761 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3762 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
3765 lwp
->pending_signals
= p_sig
;
3769 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3775 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3777 struct thread_resume_array array
= { resume_info
, n
};
3778 struct lwp_info
*need_step_over
= NULL
;
3780 int leave_all_stopped
;
3785 debug_printf ("linux_resume:\n");
3788 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3790 /* If there is a thread which would otherwise be resumed, which has
3791 a pending status, then don't resume any threads - we can just
3792 report the pending status. Make sure to queue any signals that
3793 would otherwise be sent. In non-stop mode, we'll apply this
3794 logic to each thread individually. We consume all pending events
3795 before considering to start a step-over (in all-stop). */
3798 find_inferior (&all_lwps
, resume_status_pending_p
, &any_pending
);
3800 /* If there is a thread which would otherwise be resumed, which is
3801 stopped at a breakpoint that needs stepping over, then don't
3802 resume any threads - have it step over the breakpoint with all
3803 other threads stopped, then resume all threads again. Make sure
3804 to queue any signals that would otherwise be delivered or
3806 if (!any_pending
&& supports_breakpoints ())
3808 = (struct lwp_info
*) find_inferior (&all_lwps
,
3809 need_step_over_p
, NULL
);
3811 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3815 if (need_step_over
!= NULL
)
3816 debug_printf ("Not resuming all, need step over\n");
3817 else if (any_pending
)
3818 debug_printf ("Not resuming, all-stop and found "
3819 "an LWP with pending status\n");
3821 debug_printf ("Resuming, no pending status or step over needed\n");
3824 /* Even if we're leaving threads stopped, queue all signals we'd
3825 otherwise deliver. */
3826 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
3829 start_step_over (need_step_over
);
3833 debug_printf ("linux_resume done\n");
3838 /* This function is called once per thread. We check the thread's
3839 last resume request, which will tell us whether to resume, step, or
3840 leave the thread stopped. Any signal the client requested to be
3841 delivered has already been enqueued at this point.
3843 If any thread that GDB wants running is stopped at an internal
3844 breakpoint that needs stepping over, we start a step-over operation
3845 on that particular thread, and leave all others stopped. */
3848 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3850 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3851 struct thread_info
*thread
;
3858 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (lwp
));
3863 debug_printf (" LWP %ld already running\n", lwpid_of (lwp
));
3867 thread
= get_lwp_thread (lwp
);
3869 if (thread
->last_resume_kind
== resume_stop
3870 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
3873 debug_printf (" client wants LWP to remain %ld stopped\n",
3878 if (lwp
->status_pending_p
)
3881 debug_printf (" LWP %ld has pending status, leaving stopped\n",
3886 gdb_assert (lwp
->suspended
>= 0);
3891 debug_printf (" LWP %ld is suspended\n", lwpid_of (lwp
));
3895 if (thread
->last_resume_kind
== resume_stop
3896 && lwp
->pending_signals_to_report
== NULL
3897 && lwp
->collecting_fast_tracepoint
== 0)
3899 /* We haven't reported this LWP as stopped yet (otherwise, the
3900 last_status.kind check above would catch it, and we wouldn't
3901 reach here. This LWP may have been momentarily paused by a
3902 stop_all_lwps call while handling for example, another LWP's
3903 step-over. In that case, the pending expected SIGSTOP signal
3904 that was queued at vCont;t handling time will have already
3905 been consumed by wait_for_sigstop, and so we need to requeue
3906 another one here. Note that if the LWP already has a SIGSTOP
3907 pending, this is a no-op. */
3910 debug_printf ("Client wants LWP %ld to stop. "
3911 "Making sure it has a SIGSTOP pending\n",
3917 step
= thread
->last_resume_kind
== resume_step
;
3918 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3923 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3925 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3931 gdb_assert (lwp
->suspended
>= 0);
3933 return proceed_one_lwp (entry
, except
);
3936 /* When we finish a step-over, set threads running again. If there's
3937 another thread that may need a step-over, now's the time to start
3938 it. Eventually, we'll move all threads past their breakpoints. */
3941 proceed_all_lwps (void)
3943 struct lwp_info
*need_step_over
;
3945 /* If there is a thread which would otherwise be resumed, which is
3946 stopped at a breakpoint that needs stepping over, then don't
3947 resume any threads - have it step over the breakpoint with all
3948 other threads stopped, then resume all threads again. */
3950 if (supports_breakpoints ())
3953 = (struct lwp_info
*) find_inferior (&all_lwps
,
3954 need_step_over_p
, NULL
);
3956 if (need_step_over
!= NULL
)
3959 debug_printf ("proceed_all_lwps: found "
3960 "thread %ld needing a step-over\n",
3961 lwpid_of (need_step_over
));
3963 start_step_over (need_step_over
);
3969 debug_printf ("Proceeding, no step-over needed\n");
3971 find_inferior (&all_lwps
, proceed_one_lwp
, NULL
);
3974 /* Stopped LWPs that the client wanted to be running, that don't have
3975 pending statuses, are set to run again, except for EXCEPT, if not
3976 NULL. This undoes a stop_all_lwps call. */
3979 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
3985 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
3988 debug_printf ("unstopping all lwps\n");
3992 find_inferior (&all_lwps
, unsuspend_and_proceed_one_lwp
, except
);
3994 find_inferior (&all_lwps
, proceed_one_lwp
, except
);
3998 debug_printf ("unstop_all_lwps done\n");
4004 #ifdef HAVE_LINUX_REGSETS
4006 #define use_linux_regsets 1
4008 /* Returns true if REGSET has been disabled. */
4011 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4013 return (info
->disabled_regsets
!= NULL
4014 && info
->disabled_regsets
[regset
- info
->regsets
]);
4017 /* Disable REGSET. */
4020 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4024 dr_offset
= regset
- info
->regsets
;
4025 if (info
->disabled_regsets
== NULL
)
4026 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4027 info
->disabled_regsets
[dr_offset
] = 1;
4031 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4032 struct regcache
*regcache
)
4034 struct regset_info
*regset
;
4035 int saw_general_regs
= 0;
4039 regset
= regsets_info
->regsets
;
4041 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4042 while (regset
->size
>= 0)
4047 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4053 buf
= xmalloc (regset
->size
);
4055 nt_type
= regset
->nt_type
;
4059 iov
.iov_len
= regset
->size
;
4060 data
= (void *) &iov
;
4066 res
= ptrace (regset
->get_request
, pid
,
4067 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4069 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4075 /* If we get EIO on a regset, do not try it again for
4076 this process mode. */
4077 disable_regset (regsets_info
, regset
);
4084 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4089 else if (regset
->type
== GENERAL_REGS
)
4090 saw_general_regs
= 1;
4091 regset
->store_function (regcache
, buf
);
4095 if (saw_general_regs
)
4102 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4103 struct regcache
*regcache
)
4105 struct regset_info
*regset
;
4106 int saw_general_regs
= 0;
4110 regset
= regsets_info
->regsets
;
4112 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4113 while (regset
->size
>= 0)
4118 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4124 buf
= xmalloc (regset
->size
);
4126 /* First fill the buffer with the current register set contents,
4127 in case there are any items in the kernel's regset that are
4128 not in gdbserver's regcache. */
4130 nt_type
= regset
->nt_type
;
4134 iov
.iov_len
= regset
->size
;
4135 data
= (void *) &iov
;
4141 res
= ptrace (regset
->get_request
, pid
,
4142 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4144 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4149 /* Then overlay our cached registers on that. */
4150 regset
->fill_function (regcache
, buf
);
4152 /* Only now do we write the register set. */
4154 res
= ptrace (regset
->set_request
, pid
,
4155 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4157 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4165 /* If we get EIO on a regset, do not try it again for
4166 this process mode. */
4167 disable_regset (regsets_info
, regset
);
4171 else if (errno
== ESRCH
)
4173 /* At this point, ESRCH should mean the process is
4174 already gone, in which case we simply ignore attempts
4175 to change its registers. See also the related
4176 comment in linux_resume_one_lwp. */
4182 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4185 else if (regset
->type
== GENERAL_REGS
)
4186 saw_general_regs
= 1;
4190 if (saw_general_regs
)
4196 #else /* !HAVE_LINUX_REGSETS */
4198 #define use_linux_regsets 0
4199 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4200 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4204 /* Return 1 if register REGNO is supported by one of the regset ptrace
4205 calls or 0 if it has to be transferred individually. */
4208 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4210 unsigned char mask
= 1 << (regno
% 8);
4211 size_t index
= regno
/ 8;
4213 return (use_linux_regsets
4214 && (regs_info
->regset_bitmap
== NULL
4215 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4218 #ifdef HAVE_LINUX_USRREGS
4221 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4225 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4226 error ("Invalid register number %d.", regnum
);
4228 addr
= usrregs
->regmap
[regnum
];
4233 /* Fetch one register. */
4235 fetch_register (const struct usrregs_info
*usrregs
,
4236 struct regcache
*regcache
, int regno
)
4243 if (regno
>= usrregs
->num_regs
)
4245 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4248 regaddr
= register_addr (usrregs
, regno
);
4252 size
= ((register_size (regcache
->tdesc
, regno
)
4253 + sizeof (PTRACE_XFER_TYPE
) - 1)
4254 & -sizeof (PTRACE_XFER_TYPE
));
4255 buf
= alloca (size
);
4257 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4258 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4261 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4262 ptrace (PTRACE_PEEKUSER
, pid
,
4263 /* Coerce to a uintptr_t first to avoid potential gcc warning
4264 of coercing an 8 byte integer to a 4 byte pointer. */
4265 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4266 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4268 error ("reading register %d: %s", regno
, strerror (errno
));
4271 if (the_low_target
.supply_ptrace_register
)
4272 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4274 supply_register (regcache
, regno
, buf
);
4277 /* Store one register. */
4279 store_register (const struct usrregs_info
*usrregs
,
4280 struct regcache
*regcache
, int regno
)
4287 if (regno
>= usrregs
->num_regs
)
4289 if ((*the_low_target
.cannot_store_register
) (regno
))
4292 regaddr
= register_addr (usrregs
, regno
);
4296 size
= ((register_size (regcache
->tdesc
, regno
)
4297 + sizeof (PTRACE_XFER_TYPE
) - 1)
4298 & -sizeof (PTRACE_XFER_TYPE
));
4299 buf
= alloca (size
);
4300 memset (buf
, 0, size
);
4302 if (the_low_target
.collect_ptrace_register
)
4303 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4305 collect_register (regcache
, regno
, buf
);
4307 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4308 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4311 ptrace (PTRACE_POKEUSER
, pid
,
4312 /* Coerce to a uintptr_t first to avoid potential gcc warning
4313 about coercing an 8 byte integer to a 4 byte pointer. */
4314 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4315 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4318 /* At this point, ESRCH should mean the process is
4319 already gone, in which case we simply ignore attempts
4320 to change its registers. See also the related
4321 comment in linux_resume_one_lwp. */
4325 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4326 error ("writing register %d: %s", regno
, strerror (errno
));
4328 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4332 /* Fetch all registers, or just one, from the child process.
4333 If REGNO is -1, do this for all registers, skipping any that are
4334 assumed to have been retrieved by regsets_fetch_inferior_registers,
4335 unless ALL is non-zero.
4336 Otherwise, REGNO specifies which register (so we can save time). */
4338 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4339 struct regcache
*regcache
, int regno
, int all
)
4341 struct usrregs_info
*usr
= regs_info
->usrregs
;
4345 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4346 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4347 fetch_register (usr
, regcache
, regno
);
4350 fetch_register (usr
, regcache
, regno
);
4353 /* Store our register values back into the inferior.
4354 If REGNO is -1, do this for all registers, skipping any that are
4355 assumed to have been saved by regsets_store_inferior_registers,
4356 unless ALL is non-zero.
4357 Otherwise, REGNO specifies which register (so we can save time). */
4359 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4360 struct regcache
*regcache
, int regno
, int all
)
4362 struct usrregs_info
*usr
= regs_info
->usrregs
;
4366 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4367 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4368 store_register (usr
, regcache
, regno
);
4371 store_register (usr
, regcache
, regno
);
4374 #else /* !HAVE_LINUX_USRREGS */
4376 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4377 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4383 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4387 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4391 if (the_low_target
.fetch_register
!= NULL
4392 && regs_info
->usrregs
!= NULL
)
4393 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4394 (*the_low_target
.fetch_register
) (regcache
, regno
);
4396 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4397 if (regs_info
->usrregs
!= NULL
)
4398 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4402 if (the_low_target
.fetch_register
!= NULL
4403 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4406 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4408 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4410 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4411 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4416 linux_store_registers (struct regcache
*regcache
, int regno
)
4420 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4424 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4426 if (regs_info
->usrregs
!= NULL
)
4427 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4431 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4433 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4435 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4436 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4441 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4442 to debugger memory starting at MYADDR. */
4445 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4447 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4448 register PTRACE_XFER_TYPE
*buffer
;
4449 register CORE_ADDR addr
;
4456 /* Try using /proc. Don't bother for one word. */
4457 if (len
>= 3 * sizeof (long))
4461 /* We could keep this file open and cache it - possibly one per
4462 thread. That requires some juggling, but is even faster. */
4463 sprintf (filename
, "/proc/%d/mem", pid
);
4464 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4468 /* If pread64 is available, use it. It's faster if the kernel
4469 supports it (only one syscall), and it's 64-bit safe even on
4470 32-bit platforms (for instance, SPARC debugging a SPARC64
4473 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4476 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4477 bytes
= read (fd
, myaddr
, len
);
4484 /* Some data was read, we'll try to get the rest with ptrace. */
4494 /* Round starting address down to longword boundary. */
4495 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4496 /* Round ending address up; get number of longwords that makes. */
4497 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4498 / sizeof (PTRACE_XFER_TYPE
));
4499 /* Allocate buffer of that many longwords. */
4500 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4502 /* Read all the longwords */
4504 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4506 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4507 about coercing an 8 byte integer to a 4 byte pointer. */
4508 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4509 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4510 (PTRACE_TYPE_ARG4
) 0);
4516 /* Copy appropriate bytes out of the buffer. */
4519 i
*= sizeof (PTRACE_XFER_TYPE
);
4520 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4522 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4529 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4530 memory at MEMADDR. On failure (cannot write to the inferior)
4531 returns the value of errno. Always succeeds if LEN is zero. */
4534 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4537 /* Round starting address down to longword boundary. */
4538 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4539 /* Round ending address up; get number of longwords that makes. */
4541 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4542 / sizeof (PTRACE_XFER_TYPE
);
4544 /* Allocate buffer of that many longwords. */
4545 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4546 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4548 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4552 /* Zero length write always succeeds. */
4558 /* Dump up to four bytes. */
4559 unsigned int val
= * (unsigned int *) myaddr
;
4565 val
= val
& 0xffffff;
4566 debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4567 val
, (long)memaddr
);
4570 /* Fill start and end extra bytes of buffer with existing memory data. */
4573 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4574 about coercing an 8 byte integer to a 4 byte pointer. */
4575 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4576 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4577 (PTRACE_TYPE_ARG4
) 0);
4585 = ptrace (PTRACE_PEEKTEXT
, pid
,
4586 /* Coerce to a uintptr_t first to avoid potential gcc warning
4587 about coercing an 8 byte integer to a 4 byte pointer. */
4588 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4589 * sizeof (PTRACE_XFER_TYPE
)),
4590 (PTRACE_TYPE_ARG4
) 0);
4595 /* Copy data to be written over corresponding part of buffer. */
4597 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4600 /* Write the entire buffer. */
4602 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4605 ptrace (PTRACE_POKETEXT
, pid
,
4606 /* Coerce to a uintptr_t first to avoid potential gcc warning
4607 about coercing an 8 byte integer to a 4 byte pointer. */
4608 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4609 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4618 linux_look_up_symbols (void)
4620 #ifdef USE_THREAD_DB
4621 struct process_info
*proc
= current_process ();
4623 if (proc
->private->thread_db
!= NULL
)
4626 /* If the kernel supports tracing clones, then we don't need to
4627 use the magic thread event breakpoint to learn about
4629 thread_db_init (!linux_supports_traceclone ());
4634 linux_request_interrupt (void)
4636 extern unsigned long signal_pid
;
4638 if (!ptid_equal (cont_thread
, null_ptid
)
4639 && !ptid_equal (cont_thread
, minus_one_ptid
))
4641 struct lwp_info
*lwp
;
4644 lwp
= get_thread_lwp (current_inferior
);
4645 lwpid
= lwpid_of (lwp
);
4646 kill_lwp (lwpid
, SIGINT
);
4649 kill_lwp (signal_pid
, SIGINT
);
4652 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4653 to debugger memory starting at MYADDR. */
4656 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4658 char filename
[PATH_MAX
];
4660 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4662 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4664 fd
= open (filename
, O_RDONLY
);
4668 if (offset
!= (CORE_ADDR
) 0
4669 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4672 n
= read (fd
, myaddr
, len
);
4679 /* These breakpoint and watchpoint related wrapper functions simply
4680 pass on the function call if the target has registered a
4681 corresponding function. */
4684 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4686 if (the_low_target
.insert_point
!= NULL
)
4687 return the_low_target
.insert_point (type
, addr
, len
);
4689 /* Unsupported (see target.h). */
4694 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4696 if (the_low_target
.remove_point
!= NULL
)
4697 return the_low_target
.remove_point (type
, addr
, len
);
4699 /* Unsupported (see target.h). */
4704 linux_stopped_by_watchpoint (void)
4706 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4708 return lwp
->stopped_by_watchpoint
;
4712 linux_stopped_data_address (void)
4714 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4716 return lwp
->stopped_data_address
;
4719 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4720 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4721 && defined(PT_TEXT_END_ADDR)
4723 /* This is only used for targets that define PT_TEXT_ADDR,
4724 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4725 the target has different ways of acquiring this information, like
4728 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4729 to tell gdb about. */
4732 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4734 unsigned long text
, text_end
, data
;
4735 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4739 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4740 (PTRACE_TYPE_ARG4
) 0);
4741 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4742 (PTRACE_TYPE_ARG4
) 0);
4743 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4744 (PTRACE_TYPE_ARG4
) 0);
4748 /* Both text and data offsets produced at compile-time (and so
4749 used by gdb) are relative to the beginning of the program,
4750 with the data segment immediately following the text segment.
4751 However, the actual runtime layout in memory may put the data
4752 somewhere else, so when we send gdb a data base-address, we
4753 use the real data base address and subtract the compile-time
4754 data base-address from it (which is just the length of the
4755 text segment). BSS immediately follows data in both
4758 *data_p
= data
- (text_end
- text
);
4767 linux_qxfer_osdata (const char *annex
,
4768 unsigned char *readbuf
, unsigned const char *writebuf
,
4769 CORE_ADDR offset
, int len
)
4771 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4774 /* Convert a native/host siginfo object, into/from the siginfo in the
4775 layout of the inferiors' architecture. */
4778 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4782 if (the_low_target
.siginfo_fixup
!= NULL
)
4783 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4785 /* If there was no callback, or the callback didn't do anything,
4786 then just do a straight memcpy. */
4790 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4792 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4797 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4798 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4802 char inf_siginfo
[sizeof (siginfo_t
)];
4804 if (current_inferior
== NULL
)
4807 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4810 debug_printf ("%s siginfo for lwp %d.\n",
4811 readbuf
!= NULL
? "Reading" : "Writing",
4814 if (offset
>= sizeof (siginfo
))
4817 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4820 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4821 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4822 inferior with a 64-bit GDBSERVER should look the same as debugging it
4823 with a 32-bit GDBSERVER, we need to convert it. */
4824 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4826 if (offset
+ len
> sizeof (siginfo
))
4827 len
= sizeof (siginfo
) - offset
;
4829 if (readbuf
!= NULL
)
4830 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
4833 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
4835 /* Convert back to ptrace layout before flushing it out. */
4836 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
4838 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
4845 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
4846 so we notice when children change state; as the handler for the
4847 sigsuspend in my_waitpid. */
4850 sigchld_handler (int signo
)
4852 int old_errno
= errno
;
4858 /* fprintf is not async-signal-safe, so call write
4860 if (write (2, "sigchld_handler\n",
4861 sizeof ("sigchld_handler\n") - 1) < 0)
4862 break; /* just ignore */
4866 if (target_is_async_p ())
4867 async_file_mark (); /* trigger a linux_wait */
4873 linux_supports_non_stop (void)
4879 linux_async (int enable
)
4881 int previous
= (linux_event_pipe
[0] != -1);
4884 debug_printf ("linux_async (%d), previous=%d\n",
4887 if (previous
!= enable
)
4890 sigemptyset (&mask
);
4891 sigaddset (&mask
, SIGCHLD
);
4893 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
4897 if (pipe (linux_event_pipe
) == -1)
4898 fatal ("creating event pipe failed.");
4900 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
4901 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
4903 /* Register the event loop handler. */
4904 add_file_handler (linux_event_pipe
[0],
4905 handle_target_event
, NULL
);
4907 /* Always trigger a linux_wait. */
4912 delete_file_handler (linux_event_pipe
[0]);
4914 close (linux_event_pipe
[0]);
4915 close (linux_event_pipe
[1]);
4916 linux_event_pipe
[0] = -1;
4917 linux_event_pipe
[1] = -1;
4920 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
4927 linux_start_non_stop (int nonstop
)
4929 /* Register or unregister from event-loop accordingly. */
4930 linux_async (nonstop
);
4935 linux_supports_multi_process (void)
4941 linux_supports_disable_randomization (void)
4943 #ifdef HAVE_PERSONALITY
4951 linux_supports_agent (void)
4957 linux_supports_range_stepping (void)
4959 if (*the_low_target
.supports_range_stepping
== NULL
)
4962 return (*the_low_target
.supports_range_stepping
) ();
4965 /* Enumerate spufs IDs for process PID. */
4967 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
4973 struct dirent
*entry
;
4975 sprintf (path
, "/proc/%ld/fd", pid
);
4976 dir
= opendir (path
);
4981 while ((entry
= readdir (dir
)) != NULL
)
4987 fd
= atoi (entry
->d_name
);
4991 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
4992 if (stat (path
, &st
) != 0)
4994 if (!S_ISDIR (st
.st_mode
))
4997 if (statfs (path
, &stfs
) != 0)
4999 if (stfs
.f_type
!= SPUFS_MAGIC
)
5002 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5004 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5014 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5015 object type, using the /proc file system. */
5017 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5018 unsigned const char *writebuf
,
5019 CORE_ADDR offset
, int len
)
5021 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
5026 if (!writebuf
&& !readbuf
)
5034 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5037 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5038 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5043 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5050 ret
= write (fd
, writebuf
, (size_t) len
);
5052 ret
= read (fd
, readbuf
, (size_t) len
);
5058 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5059 struct target_loadseg
5061 /* Core address to which the segment is mapped. */
5063 /* VMA recorded in the program header. */
5065 /* Size of this segment in memory. */
5069 # if defined PT_GETDSBT
5070 struct target_loadmap
5072 /* Protocol version number, must be zero. */
5074 /* Pointer to the DSBT table, its size, and the DSBT index. */
5075 unsigned *dsbt_table
;
5076 unsigned dsbt_size
, dsbt_index
;
5077 /* Number of segments in this map. */
5079 /* The actual memory map. */
5080 struct target_loadseg segs
[/*nsegs*/];
5082 # define LINUX_LOADMAP PT_GETDSBT
5083 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5084 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5086 struct target_loadmap
5088 /* Protocol version number, must be zero. */
5090 /* Number of segments in this map. */
5092 /* The actual memory map. */
5093 struct target_loadseg segs
[/*nsegs*/];
5095 # define LINUX_LOADMAP PTRACE_GETFDPIC
5096 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5097 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5101 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5102 unsigned char *myaddr
, unsigned int len
)
5104 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
5106 struct target_loadmap
*data
= NULL
;
5107 unsigned int actual_length
, copy_length
;
5109 if (strcmp (annex
, "exec") == 0)
5110 addr
= (int) LINUX_LOADMAP_EXEC
;
5111 else if (strcmp (annex
, "interp") == 0)
5112 addr
= (int) LINUX_LOADMAP_INTERP
;
5116 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5122 actual_length
= sizeof (struct target_loadmap
)
5123 + sizeof (struct target_loadseg
) * data
->nsegs
;
5125 if (offset
< 0 || offset
> actual_length
)
5128 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5129 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5133 # define linux_read_loadmap NULL
5134 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5137 linux_process_qsupported (const char *query
)
5139 if (the_low_target
.process_qsupported
!= NULL
)
5140 the_low_target
.process_qsupported (query
);
5144 linux_supports_tracepoints (void)
5146 if (*the_low_target
.supports_tracepoints
== NULL
)
5149 return (*the_low_target
.supports_tracepoints
) ();
5153 linux_read_pc (struct regcache
*regcache
)
5155 if (the_low_target
.get_pc
== NULL
)
5158 return (*the_low_target
.get_pc
) (regcache
);
5162 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5164 gdb_assert (the_low_target
.set_pc
!= NULL
);
5166 (*the_low_target
.set_pc
) (regcache
, pc
);
5170 linux_thread_stopped (struct thread_info
*thread
)
5172 return get_thread_lwp (thread
)->stopped
;
5175 /* This exposes stop-all-threads functionality to other modules. */
5178 linux_pause_all (int freeze
)
5180 stop_all_lwps (freeze
, NULL
);
5183 /* This exposes unstop-all-threads functionality to other gdbserver
5187 linux_unpause_all (int unfreeze
)
5189 unstop_all_lwps (unfreeze
, NULL
);
5193 linux_prepare_to_access_memory (void)
5195 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5198 linux_pause_all (1);
5203 linux_done_accessing_memory (void)
5205 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5208 linux_unpause_all (1);
5212 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5213 CORE_ADDR collector
,
5216 CORE_ADDR
*jump_entry
,
5217 CORE_ADDR
*trampoline
,
5218 ULONGEST
*trampoline_size
,
5219 unsigned char *jjump_pad_insn
,
5220 ULONGEST
*jjump_pad_insn_size
,
5221 CORE_ADDR
*adjusted_insn_addr
,
5222 CORE_ADDR
*adjusted_insn_addr_end
,
5225 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5226 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5227 jump_entry
, trampoline
, trampoline_size
,
5228 jjump_pad_insn
, jjump_pad_insn_size
,
5229 adjusted_insn_addr
, adjusted_insn_addr_end
,
5233 static struct emit_ops
*
5234 linux_emit_ops (void)
5236 if (the_low_target
.emit_ops
!= NULL
)
5237 return (*the_low_target
.emit_ops
) ();
5243 linux_get_min_fast_tracepoint_insn_len (void)
5245 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5248 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5251 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5252 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5254 char filename
[PATH_MAX
];
5256 const int auxv_size
= is_elf64
5257 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5258 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5260 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5262 fd
= open (filename
, O_RDONLY
);
5268 while (read (fd
, buf
, auxv_size
) == auxv_size
5269 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5273 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5275 switch (aux
->a_type
)
5278 *phdr_memaddr
= aux
->a_un
.a_val
;
5281 *num_phdr
= aux
->a_un
.a_val
;
5287 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5289 switch (aux
->a_type
)
5292 *phdr_memaddr
= aux
->a_un
.a_val
;
5295 *num_phdr
= aux
->a_un
.a_val
;
5303 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5305 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5306 "phdr_memaddr = %ld, phdr_num = %d",
5307 (long) *phdr_memaddr
, *num_phdr
);
5314 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5317 get_dynamic (const int pid
, const int is_elf64
)
5319 CORE_ADDR phdr_memaddr
, relocation
;
5321 unsigned char *phdr_buf
;
5322 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5324 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5327 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5328 phdr_buf
= alloca (num_phdr
* phdr_size
);
5330 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5333 /* Compute relocation: it is expected to be 0 for "regular" executables,
5334 non-zero for PIE ones. */
5336 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5339 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5341 if (p
->p_type
== PT_PHDR
)
5342 relocation
= phdr_memaddr
- p
->p_vaddr
;
5346 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5348 if (p
->p_type
== PT_PHDR
)
5349 relocation
= phdr_memaddr
- p
->p_vaddr
;
5352 if (relocation
== -1)
5354 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5355 any real world executables, including PIE executables, have always
5356 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5357 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5358 or present DT_DEBUG anyway (fpc binaries are statically linked).
5360 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5362 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5367 for (i
= 0; i
< num_phdr
; i
++)
5371 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5373 if (p
->p_type
== PT_DYNAMIC
)
5374 return p
->p_vaddr
+ relocation
;
5378 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5380 if (p
->p_type
== PT_DYNAMIC
)
5381 return p
->p_vaddr
+ relocation
;
5388 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5389 can be 0 if the inferior does not yet have the library list initialized.
5390 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5391 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5394 get_r_debug (const int pid
, const int is_elf64
)
5396 CORE_ADDR dynamic_memaddr
;
5397 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5398 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5401 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5402 if (dynamic_memaddr
== 0)
5405 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5409 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5410 #ifdef DT_MIPS_RLD_MAP
5414 unsigned char buf
[sizeof (Elf64_Xword
)];
5418 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5420 if (linux_read_memory (dyn
->d_un
.d_val
,
5421 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5426 #endif /* DT_MIPS_RLD_MAP */
5428 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5429 map
= dyn
->d_un
.d_val
;
5431 if (dyn
->d_tag
== DT_NULL
)
5436 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5437 #ifdef DT_MIPS_RLD_MAP
5441 unsigned char buf
[sizeof (Elf32_Word
)];
5445 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5447 if (linux_read_memory (dyn
->d_un
.d_val
,
5448 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5453 #endif /* DT_MIPS_RLD_MAP */
5455 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5456 map
= dyn
->d_un
.d_val
;
5458 if (dyn
->d_tag
== DT_NULL
)
5462 dynamic_memaddr
+= dyn_size
;
5468 /* Read one pointer from MEMADDR in the inferior. */
5471 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5475 /* Go through a union so this works on either big or little endian
5476 hosts, when the inferior's pointer size is smaller than the size
5477 of CORE_ADDR. It is assumed the inferior's endianness is the
5478 same of the superior's. */
5481 CORE_ADDR core_addr
;
5486 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5489 if (ptr_size
== sizeof (CORE_ADDR
))
5490 *ptr
= addr
.core_addr
;
5491 else if (ptr_size
== sizeof (unsigned int))
5494 gdb_assert_not_reached ("unhandled pointer size");
5499 struct link_map_offsets
5501 /* Offset and size of r_debug.r_version. */
5502 int r_version_offset
;
5504 /* Offset and size of r_debug.r_map. */
5507 /* Offset to l_addr field in struct link_map. */
5510 /* Offset to l_name field in struct link_map. */
5513 /* Offset to l_ld field in struct link_map. */
5516 /* Offset to l_next field in struct link_map. */
5519 /* Offset to l_prev field in struct link_map. */
5523 /* Construct qXfer:libraries-svr4:read reply. */
5526 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5527 unsigned const char *writebuf
,
5528 CORE_ADDR offset
, int len
)
5531 unsigned document_len
;
5532 struct process_info_private
*const priv
= current_process ()->private;
5533 char filename
[PATH_MAX
];
5536 static const struct link_map_offsets lmo_32bit_offsets
=
5538 0, /* r_version offset. */
5539 4, /* r_debug.r_map offset. */
5540 0, /* l_addr offset in link_map. */
5541 4, /* l_name offset in link_map. */
5542 8, /* l_ld offset in link_map. */
5543 12, /* l_next offset in link_map. */
5544 16 /* l_prev offset in link_map. */
5547 static const struct link_map_offsets lmo_64bit_offsets
=
5549 0, /* r_version offset. */
5550 8, /* r_debug.r_map offset. */
5551 0, /* l_addr offset in link_map. */
5552 8, /* l_name offset in link_map. */
5553 16, /* l_ld offset in link_map. */
5554 24, /* l_next offset in link_map. */
5555 32 /* l_prev offset in link_map. */
5557 const struct link_map_offsets
*lmo
;
5558 unsigned int machine
;
5560 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5561 int allocated
= 1024;
5563 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5564 int header_done
= 0;
5566 if (writebuf
!= NULL
)
5568 if (readbuf
== NULL
)
5571 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5572 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5573 is_elf64
= elf_64_file_p (filename
, &machine
);
5574 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5575 ptr_size
= is_elf64
? 8 : 4;
5577 while (annex
[0] != '\0')
5583 sep
= strchr (annex
, '=');
5588 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5590 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5594 annex
= strchr (sep
, ';');
5601 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5608 if (priv
->r_debug
== 0)
5609 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5611 /* We failed to find DT_DEBUG. Such situation will not change
5612 for this inferior - do not retry it. Report it to GDB as
5613 E01, see for the reasons at the GDB solib-svr4.c side. */
5614 if (priv
->r_debug
== (CORE_ADDR
) -1)
5617 if (priv
->r_debug
!= 0)
5619 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5620 (unsigned char *) &r_version
,
5621 sizeof (r_version
)) != 0
5624 warning ("unexpected r_debug version %d", r_version
);
5626 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5627 &lm_addr
, ptr_size
) != 0)
5629 warning ("unable to read r_map from 0x%lx",
5630 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5635 document
= xmalloc (allocated
);
5636 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5637 p
= document
+ strlen (document
);
5640 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5641 &l_name
, ptr_size
) == 0
5642 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5643 &l_addr
, ptr_size
) == 0
5644 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5645 &l_ld
, ptr_size
) == 0
5646 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5647 &l_prev
, ptr_size
) == 0
5648 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5649 &l_next
, ptr_size
) == 0)
5651 unsigned char libname
[PATH_MAX
];
5653 if (lm_prev
!= l_prev
)
5655 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5656 (long) lm_prev
, (long) l_prev
);
5660 /* Ignore the first entry even if it has valid name as the first entry
5661 corresponds to the main executable. The first entry should not be
5662 skipped if the dynamic loader was loaded late by a static executable
5663 (see solib-svr4.c parameter ignore_first). But in such case the main
5664 executable does not have PT_DYNAMIC present and this function already
5665 exited above due to failed get_r_debug. */
5668 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5673 /* Not checking for error because reading may stop before
5674 we've got PATH_MAX worth of characters. */
5676 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5677 libname
[sizeof (libname
) - 1] = '\0';
5678 if (libname
[0] != '\0')
5680 /* 6x the size for xml_escape_text below. */
5681 size_t len
= 6 * strlen ((char *) libname
);
5686 /* Terminate `<library-list-svr4'. */
5691 while (allocated
< p
- document
+ len
+ 200)
5693 /* Expand to guarantee sufficient storage. */
5694 uintptr_t document_len
= p
- document
;
5696 document
= xrealloc (document
, 2 * allocated
);
5698 p
= document
+ document_len
;
5701 name
= xml_escape_text ((char *) libname
);
5702 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5703 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5704 name
, (unsigned long) lm_addr
,
5705 (unsigned long) l_addr
, (unsigned long) l_ld
);
5716 /* Empty list; terminate `<library-list-svr4'. */
5720 strcpy (p
, "</library-list-svr4>");
5722 document_len
= strlen (document
);
5723 if (offset
< document_len
)
5724 document_len
-= offset
;
5727 if (len
> document_len
)
5730 memcpy (readbuf
, document
+ offset
, len
);
5736 #ifdef HAVE_LINUX_BTRACE
5738 /* See to_enable_btrace target method. */
5740 static struct btrace_target_info
*
5741 linux_low_enable_btrace (ptid_t ptid
)
5743 struct btrace_target_info
*tinfo
;
5745 tinfo
= linux_enable_btrace (ptid
);
5749 struct thread_info
*thread
= find_thread_ptid (ptid
);
5750 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5752 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5758 /* See to_disable_btrace target method. */
5761 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
5763 enum btrace_error err
;
5765 err
= linux_disable_btrace (tinfo
);
5766 return (err
== BTRACE_ERR_NONE
? 0 : -1);
5769 /* See to_read_btrace target method. */
5772 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5775 VEC (btrace_block_s
) *btrace
;
5776 struct btrace_block
*block
;
5777 enum btrace_error err
;
5781 err
= linux_read_btrace (&btrace
, tinfo
, type
);
5782 if (err
!= BTRACE_ERR_NONE
)
5784 if (err
== BTRACE_ERR_OVERFLOW
)
5785 buffer_grow_str0 (buffer
, "E.Overflow.");
5787 buffer_grow_str0 (buffer
, "E.Generic Error.");
5792 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5793 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5795 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5796 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5797 paddress (block
->begin
), paddress (block
->end
));
5799 buffer_grow_str0 (buffer
, "</btrace>\n");
5801 VEC_free (btrace_block_s
, btrace
);
5805 #endif /* HAVE_LINUX_BTRACE */
5807 static struct target_ops linux_target_ops
= {
5808 linux_create_inferior
,
5817 linux_fetch_registers
,
5818 linux_store_registers
,
5819 linux_prepare_to_access_memory
,
5820 linux_done_accessing_memory
,
5823 linux_look_up_symbols
,
5824 linux_request_interrupt
,
5828 linux_stopped_by_watchpoint
,
5829 linux_stopped_data_address
,
5830 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5831 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5832 && defined(PT_TEXT_END_ADDR)
5837 #ifdef USE_THREAD_DB
5838 thread_db_get_tls_address
,
5843 hostio_last_error_from_errno
,
5846 linux_supports_non_stop
,
5848 linux_start_non_stop
,
5849 linux_supports_multi_process
,
5850 #ifdef USE_THREAD_DB
5851 thread_db_handle_monitor_command
,
5855 linux_common_core_of_thread
,
5857 linux_process_qsupported
,
5858 linux_supports_tracepoints
,
5861 linux_thread_stopped
,
5865 linux_cancel_breakpoints
,
5866 linux_stabilize_threads
,
5867 linux_install_fast_tracepoint_jump_pad
,
5869 linux_supports_disable_randomization
,
5870 linux_get_min_fast_tracepoint_insn_len
,
5871 linux_qxfer_libraries_svr4
,
5872 linux_supports_agent
,
5873 #ifdef HAVE_LINUX_BTRACE
5874 linux_supports_btrace
,
5875 linux_low_enable_btrace
,
5876 linux_low_disable_btrace
,
5877 linux_low_read_btrace
,
5884 linux_supports_range_stepping
,
5888 linux_init_signals ()
5890 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
5891 to find what the cancel signal actually is. */
5892 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
5893 signal (__SIGRTMIN
+1, SIG_IGN
);
5897 #ifdef HAVE_LINUX_REGSETS
5899 initialize_regsets_info (struct regsets_info
*info
)
5901 for (info
->num_regsets
= 0;
5902 info
->regsets
[info
->num_regsets
].size
>= 0;
5903 info
->num_regsets
++)
5909 initialize_low (void)
5911 struct sigaction sigchld_action
;
5912 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
5913 set_target_ops (&linux_target_ops
);
5914 set_breakpoint_data (the_low_target
.breakpoint
,
5915 the_low_target
.breakpoint_len
);
5916 linux_init_signals ();
5917 linux_ptrace_init_warnings ();
5919 sigchld_action
.sa_handler
= sigchld_handler
;
5920 sigemptyset (&sigchld_action
.sa_mask
);
5921 sigchld_action
.sa_flags
= SA_RESTART
;
5922 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
5924 initialize_low_arch ();