1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2013 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"
26 #include <sys/ptrace.h>
27 #include "linux-ptrace.h"
28 #include "linux-procfs.h"
30 #include <sys/ioctl.h>
36 #include <sys/syscall.h>
40 #include <sys/types.h>
46 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
47 then ELFMAG0 will have been defined. If it didn't get included by
48 gdb_proc_service.h then including it will likely introduce a duplicate
49 definition of elf_fpregset_t. */
54 #define SPUFS_MAGIC 0x23c9b64e
57 #ifdef HAVE_PERSONALITY
58 # include <sys/personality.h>
59 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
60 # define ADDR_NO_RANDOMIZE 0x0040000
69 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
72 /* This is the kernel's hard limit. Not to be confused with
79 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
80 /* PTRACE_TEXT_ADDR and friends. */
81 #include <asm/ptrace.h>
86 /* Some targets did not define these ptrace constants from the start,
87 so gdbserver defines them locally here. In the future, these may
88 be removed after they are added to asm/ptrace.h. */
89 #if !(defined(PT_TEXT_ADDR) \
90 || defined(PT_DATA_ADDR) \
91 || defined(PT_TEXT_END_ADDR))
92 #if defined(__mcoldfire__)
93 /* These are still undefined in 3.10 kernels. */
94 #define PT_TEXT_ADDR 49*4
95 #define PT_DATA_ADDR 50*4
96 #define PT_TEXT_END_ADDR 51*4
97 /* BFIN already defines these since at least 2.6.32 kernels. */
99 #define PT_TEXT_ADDR 220
100 #define PT_TEXT_END_ADDR 224
101 #define PT_DATA_ADDR 228
102 /* These are still undefined in 3.10 kernels. */
103 #elif defined(__TMS320C6X__)
104 #define PT_TEXT_ADDR (0x10000*4)
105 #define PT_DATA_ADDR (0x10004*4)
106 #define PT_TEXT_END_ADDR (0x10008*4)
110 #ifdef HAVE_LINUX_BTRACE
111 # include "linux-btrace.h"
114 #ifndef HAVE_ELF32_AUXV_T
115 /* Copied from glibc's elf.h. */
118 uint32_t a_type
; /* Entry type */
121 uint32_t a_val
; /* Integer value */
122 /* We use to have pointer elements added here. We cannot do that,
123 though, since it does not work when using 32-bit definitions
124 on 64-bit platforms and vice versa. */
129 #ifndef HAVE_ELF64_AUXV_T
130 /* Copied from glibc's elf.h. */
133 uint64_t a_type
; /* Entry type */
136 uint64_t a_val
; /* Integer value */
137 /* We use to have pointer elements added here. We cannot do that,
138 though, since it does not work when using 32-bit definitions
139 on 64-bit platforms and vice versa. */
144 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
145 representation of the thread ID.
147 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
148 the same as the LWP ID.
150 ``all_processes'' is keyed by the "overall process ID", which
151 GNU/Linux calls tgid, "thread group ID". */
153 struct inferior_list all_lwps
;
155 /* A list of all unknown processes which receive stop signals. Some
156 other process will presumably claim each of these as forked
157 children momentarily. */
159 struct simple_pid_list
161 /* The process ID. */
164 /* The status as reported by waitpid. */
168 struct simple_pid_list
*next
;
170 struct simple_pid_list
*stopped_pids
;
172 /* Trivial list manipulation functions to keep track of a list of new
173 stopped processes. */
176 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
178 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
181 new_pid
->status
= status
;
182 new_pid
->next
= *listp
;
187 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
189 struct simple_pid_list
**p
;
191 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
192 if ((*p
)->pid
== pid
)
194 struct simple_pid_list
*next
= (*p
)->next
;
196 *statusp
= (*p
)->status
;
204 enum stopping_threads_kind
206 /* Not stopping threads presently. */
207 NOT_STOPPING_THREADS
,
209 /* Stopping threads. */
212 /* Stopping and suspending threads. */
213 STOPPING_AND_SUSPENDING_THREADS
216 /* This is set while stop_all_lwps is in effect. */
217 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
219 /* FIXME make into a target method? */
220 int using_threads
= 1;
222 /* True if we're presently stabilizing threads (moving them out of
224 static int stabilizing_threads
;
226 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
227 int step
, int signal
, siginfo_t
*info
);
228 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
229 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
230 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
231 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
232 static void *add_lwp (ptid_t ptid
);
233 static int linux_stopped_by_watchpoint (void);
234 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
235 static void proceed_all_lwps (void);
236 static int finish_step_over (struct lwp_info
*lwp
);
237 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
238 static int kill_lwp (unsigned long lwpid
, int signo
);
239 static void linux_enable_event_reporting (int pid
);
241 /* True if the low target can hardware single-step. Such targets
242 don't need a BREAKPOINT_REINSERT_ADDR callback. */
245 can_hardware_single_step (void)
247 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
250 /* True if the low target supports memory breakpoints. If so, we'll
251 have a GET_PC implementation. */
254 supports_breakpoints (void)
256 return (the_low_target
.get_pc
!= NULL
);
259 /* Returns true if this target can support fast tracepoints. This
260 does not mean that the in-process agent has been loaded in the
264 supports_fast_tracepoints (void)
266 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
269 /* True if LWP is stopped in its stepping range. */
272 lwp_in_step_range (struct lwp_info
*lwp
)
274 CORE_ADDR pc
= lwp
->stop_pc
;
276 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
279 struct pending_signals
283 struct pending_signals
*prev
;
286 /* The read/write ends of the pipe registered as waitable file in the
288 static int linux_event_pipe
[2] = { -1, -1 };
290 /* True if we're currently in async mode. */
291 #define target_is_async_p() (linux_event_pipe[0] != -1)
293 static void send_sigstop (struct lwp_info
*lwp
);
294 static void wait_for_sigstop (struct inferior_list_entry
*entry
);
296 /* Return non-zero if HEADER is a 64-bit ELF file. */
299 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
301 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
302 && header
->e_ident
[EI_MAG1
] == ELFMAG1
303 && header
->e_ident
[EI_MAG2
] == ELFMAG2
304 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
306 *machine
= header
->e_machine
;
307 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
314 /* Return non-zero if FILE is a 64-bit ELF file,
315 zero if the file is not a 64-bit ELF file,
316 and -1 if the file is not accessible or doesn't exist. */
319 elf_64_file_p (const char *file
, unsigned int *machine
)
324 fd
= open (file
, O_RDONLY
);
328 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
335 return elf_64_header_p (&header
, machine
);
338 /* Accepts an integer PID; Returns true if the executable PID is
339 running is a 64-bit ELF file.. */
342 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
346 sprintf (file
, "/proc/%d/exe", pid
);
347 return elf_64_file_p (file
, machine
);
351 delete_lwp (struct lwp_info
*lwp
)
353 remove_thread (get_lwp_thread (lwp
));
354 remove_inferior (&all_lwps
, &lwp
->head
);
355 free (lwp
->arch_private
);
359 /* Add a process to the common process list, and set its private
362 static struct process_info
*
363 linux_add_process (int pid
, int attached
)
365 struct process_info
*proc
;
367 proc
= add_process (pid
, attached
);
368 proc
->private = xcalloc (1, sizeof (*proc
->private));
370 /* Set the arch when the first LWP stops. */
371 proc
->private->new_inferior
= 1;
373 if (the_low_target
.new_process
!= NULL
)
374 proc
->private->arch_private
= the_low_target
.new_process ();
379 /* Wrapper function for waitpid which handles EINTR, and emulates
380 __WALL for systems where that is not available. */
383 my_waitpid (int pid
, int *status
, int flags
)
388 fprintf (stderr
, "my_waitpid (%d, 0x%x)\n", pid
, flags
);
392 sigset_t block_mask
, org_mask
, wake_mask
;
395 wnohang
= (flags
& WNOHANG
) != 0;
396 flags
&= ~(__WALL
| __WCLONE
);
399 /* Block all signals while here. This avoids knowing about
400 LinuxThread's signals. */
401 sigfillset (&block_mask
);
402 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
404 /* ... except during the sigsuspend below. */
405 sigemptyset (&wake_mask
);
409 /* Since all signals are blocked, there's no need to check
411 ret
= waitpid (pid
, status
, flags
);
414 if (ret
== -1 && out_errno
!= ECHILD
)
419 if (flags
& __WCLONE
)
421 /* We've tried both flavors now. If WNOHANG is set,
422 there's nothing else to do, just bail out. */
427 fprintf (stderr
, "blocking\n");
429 /* Block waiting for signals. */
430 sigsuspend (&wake_mask
);
436 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
441 ret
= waitpid (pid
, status
, flags
);
442 while (ret
== -1 && errno
== EINTR
);
447 fprintf (stderr
, "my_waitpid (%d, 0x%x): status(%x), %d\n",
448 pid
, flags
, status
? *status
: -1, ret
);
454 /* Handle a GNU/Linux extended wait response. If we see a clone
455 event, we need to add the new LWP to our list (and not report the
456 trap to higher layers). */
459 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
461 int event
= wstat
>> 16;
462 struct lwp_info
*new_lwp
;
464 if (event
== PTRACE_EVENT_CLONE
)
467 unsigned long new_pid
;
470 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), (PTRACE_TYPE_ARG3
) 0,
473 /* If we haven't already seen the new PID stop, wait for it now. */
474 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
476 /* The new child has a pending SIGSTOP. We can't affect it until it
477 hits the SIGSTOP, but we're already attached. */
479 ret
= my_waitpid (new_pid
, &status
, __WALL
);
482 perror_with_name ("waiting for new child");
483 else if (ret
!= new_pid
)
484 warning ("wait returned unexpected PID %d", ret
);
485 else if (!WIFSTOPPED (status
))
486 warning ("wait returned unexpected status 0x%x", status
);
489 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
490 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
491 add_thread (ptid
, new_lwp
);
493 /* Either we're going to immediately resume the new thread
494 or leave it stopped. linux_resume_one_lwp is a nop if it
495 thinks the thread is currently running, so set this first
496 before calling linux_resume_one_lwp. */
497 new_lwp
->stopped
= 1;
499 /* If we're suspending all threads, leave this one suspended
501 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
502 new_lwp
->suspended
= 1;
504 /* Normally we will get the pending SIGSTOP. But in some cases
505 we might get another signal delivered to the group first.
506 If we do get another signal, be sure not to lose it. */
507 if (WSTOPSIG (status
) == SIGSTOP
)
509 if (stopping_threads
!= NOT_STOPPING_THREADS
)
510 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
512 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
516 new_lwp
->stop_expected
= 1;
518 if (stopping_threads
!= NOT_STOPPING_THREADS
)
520 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
521 new_lwp
->status_pending_p
= 1;
522 new_lwp
->status_pending
= status
;
525 /* Pass the signal on. This is what GDB does - except
526 shouldn't we really report it instead? */
527 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
530 /* Always resume the current thread. If we are stopping
531 threads, it will have a pending SIGSTOP; we may as well
533 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
537 /* Return the PC as read from the regcache of LWP, without any
541 get_pc (struct lwp_info
*lwp
)
543 struct thread_info
*saved_inferior
;
544 struct regcache
*regcache
;
547 if (the_low_target
.get_pc
== NULL
)
550 saved_inferior
= current_inferior
;
551 current_inferior
= get_lwp_thread (lwp
);
553 regcache
= get_thread_regcache (current_inferior
, 1);
554 pc
= (*the_low_target
.get_pc
) (regcache
);
557 fprintf (stderr
, "pc is 0x%lx\n", (long) pc
);
559 current_inferior
= saved_inferior
;
563 /* This function should only be called if LWP got a SIGTRAP.
564 The SIGTRAP could mean several things.
566 On i386, where decr_pc_after_break is non-zero:
567 If we were single-stepping this process using PTRACE_SINGLESTEP,
568 we will get only the one SIGTRAP (even if the instruction we
569 stepped over was a breakpoint). The value of $eip will be the
571 If we continue the process using PTRACE_CONT, we will get a
572 SIGTRAP when we hit a breakpoint. The value of $eip will be
573 the instruction after the breakpoint (i.e. needs to be
574 decremented). If we report the SIGTRAP to GDB, we must also
575 report the undecremented PC. If we cancel the SIGTRAP, we
576 must resume at the decremented PC.
578 (Presumably, not yet tested) On a non-decr_pc_after_break machine
579 with hardware or kernel single-step:
580 If we single-step over a breakpoint instruction, our PC will
581 point at the following instruction. If we continue and hit a
582 breakpoint instruction, our PC will point at the breakpoint
586 get_stop_pc (struct lwp_info
*lwp
)
590 if (the_low_target
.get_pc
== NULL
)
593 stop_pc
= get_pc (lwp
);
595 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
597 && !lwp
->stopped_by_watchpoint
598 && lwp
->last_status
>> 16 == 0)
599 stop_pc
-= the_low_target
.decr_pc_after_break
;
602 fprintf (stderr
, "stop pc is 0x%lx\n", (long) stop_pc
);
608 add_lwp (ptid_t ptid
)
610 struct lwp_info
*lwp
;
612 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
613 memset (lwp
, 0, sizeof (*lwp
));
617 if (the_low_target
.new_thread
!= NULL
)
618 lwp
->arch_private
= the_low_target
.new_thread ();
620 add_inferior_to_list (&all_lwps
, &lwp
->head
);
625 /* Start an inferior process and returns its pid.
626 ALLARGS is a vector of program-name and args. */
629 linux_create_inferior (char *program
, char **allargs
)
631 #ifdef HAVE_PERSONALITY
632 int personality_orig
= 0, personality_set
= 0;
634 struct lwp_info
*new_lwp
;
638 #ifdef HAVE_PERSONALITY
639 if (disable_randomization
)
642 personality_orig
= personality (0xffffffff);
643 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
646 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
648 if (errno
!= 0 || (personality_set
649 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
650 warning ("Error disabling address space randomization: %s",
655 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
661 perror_with_name ("fork");
665 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
667 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
668 signal (__SIGRTMIN
+ 1, SIG_DFL
);
673 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
674 stdout to stderr so that inferior i/o doesn't corrupt the connection.
675 Also, redirect stdin to /dev/null. */
676 if (remote_connection_is_stdio ())
679 open ("/dev/null", O_RDONLY
);
681 if (write (2, "stdin/stdout redirected\n",
682 sizeof ("stdin/stdout redirected\n") - 1) < 0)
684 /* Errors ignored. */;
688 execv (program
, allargs
);
690 execvp (program
, allargs
);
692 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
698 #ifdef HAVE_PERSONALITY
702 personality (personality_orig
);
704 warning ("Error restoring address space randomization: %s",
709 linux_add_process (pid
, 0);
711 ptid
= ptid_build (pid
, pid
, 0);
712 new_lwp
= add_lwp (ptid
);
713 add_thread (ptid
, new_lwp
);
714 new_lwp
->must_set_ptrace_flags
= 1;
719 /* Attach to an inferior process. */
722 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
725 struct lwp_info
*new_lwp
;
727 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
730 struct buffer buffer
;
734 /* If we fail to attach to an LWP, just warn. */
735 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
736 strerror (errno
), errno
);
741 /* If we fail to attach to a process, report an error. */
742 buffer_init (&buffer
);
743 linux_ptrace_attach_warnings (lwpid
, &buffer
);
744 buffer_grow_str0 (&buffer
, "");
745 error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer
),
746 lwpid
, strerror (errno
), errno
);
750 /* If lwp is the tgid, we handle adding existing threads later.
751 Otherwise we just add lwp without bothering about any other
753 ptid
= ptid_build (lwpid
, lwpid
, 0);
756 /* Note that extracting the pid from the current inferior is
757 safe, since we're always called in the context of the same
758 process as this new thread. */
759 int pid
= pid_of (get_thread_lwp (current_inferior
));
760 ptid
= ptid_build (pid
, lwpid
, 0);
763 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
764 add_thread (ptid
, new_lwp
);
766 /* We need to wait for SIGSTOP before being able to make the next
767 ptrace call on this LWP. */
768 new_lwp
->must_set_ptrace_flags
= 1;
770 if (linux_proc_pid_is_stopped (lwpid
))
774 "Attached to a stopped process\n");
776 /* The process is definitely stopped. It is in a job control
777 stop, unless the kernel predates the TASK_STOPPED /
778 TASK_TRACED distinction, in which case it might be in a
779 ptrace stop. Make sure it is in a ptrace stop; from there we
780 can kill it, signal it, et cetera.
782 First make sure there is a pending SIGSTOP. Since we are
783 already attached, the process can not transition from stopped
784 to running without a PTRACE_CONT; so we know this signal will
785 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
786 probably already in the queue (unless this kernel is old
787 enough to use TASK_STOPPED for ptrace stops); but since
788 SIGSTOP is not an RT signal, it can only be queued once. */
789 kill_lwp (lwpid
, SIGSTOP
);
791 /* Finally, resume the stopped process. This will deliver the
792 SIGSTOP (or a higher priority signal, just like normal
793 PTRACE_ATTACH), which we'll catch later on. */
794 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
797 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
800 There are several cases to consider here:
802 1) gdbserver has already attached to the process and is being notified
803 of a new thread that is being created.
804 In this case we should ignore that SIGSTOP and resume the
805 process. This is handled below by setting stop_expected = 1,
806 and the fact that add_thread sets last_resume_kind ==
809 2) This is the first thread (the process thread), and we're attaching
810 to it via attach_inferior.
811 In this case we want the process thread to stop.
812 This is handled by having linux_attach set last_resume_kind ==
813 resume_stop after we return.
815 If the pid we are attaching to is also the tgid, we attach to and
816 stop all the existing threads. Otherwise, we attach to pid and
817 ignore any other threads in the same group as this pid.
819 3) GDB is connecting to gdbserver and is requesting an enumeration of all
821 In this case we want the thread to stop.
822 FIXME: This case is currently not properly handled.
823 We should wait for the SIGSTOP but don't. Things work apparently
824 because enough time passes between when we ptrace (ATTACH) and when
825 gdb makes the next ptrace call on the thread.
827 On the other hand, if we are currently trying to stop all threads, we
828 should treat the new thread as if we had sent it a SIGSTOP. This works
829 because we are guaranteed that the add_lwp call above added us to the
830 end of the list, and so the new thread has not yet reached
831 wait_for_sigstop (but will). */
832 new_lwp
->stop_expected
= 1;
836 linux_attach_lwp (unsigned long lwpid
)
838 linux_attach_lwp_1 (lwpid
, 0);
841 /* Attach to PID. If PID is the tgid, attach to it and all
845 linux_attach (unsigned long pid
)
847 /* Attach to PID. We will check for other threads
849 linux_attach_lwp_1 (pid
, 1);
850 linux_add_process (pid
, 1);
854 struct thread_info
*thread
;
856 /* Don't ignore the initial SIGSTOP if we just attached to this
857 process. It will be collected by wait shortly. */
858 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
859 thread
->last_resume_kind
= resume_stop
;
862 if (linux_proc_get_tgid (pid
) == pid
)
867 sprintf (pathname
, "/proc/%ld/task", pid
);
869 dir
= opendir (pathname
);
873 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
878 /* At this point we attached to the tgid. Scan the task for
881 int new_threads_found
;
885 while (iterations
< 2)
887 new_threads_found
= 0;
888 /* Add all the other threads. While we go through the
889 threads, new threads may be spawned. Cycle through
890 the list of threads until we have done two iterations without
891 finding new threads. */
892 while ((dp
= readdir (dir
)) != NULL
)
895 lwp
= strtoul (dp
->d_name
, NULL
, 10);
897 /* Is this a new thread? */
899 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
901 linux_attach_lwp_1 (lwp
, 0);
906 Found and attached to new lwp %ld\n", lwp
);
910 if (!new_threads_found
)
931 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
933 struct counter
*counter
= args
;
935 if (ptid_get_pid (entry
->id
) == counter
->pid
)
937 if (++counter
->count
> 1)
945 last_thread_of_process_p (struct thread_info
*thread
)
947 ptid_t ptid
= ((struct inferior_list_entry
*)thread
)->id
;
948 int pid
= ptid_get_pid (ptid
);
949 struct counter counter
= { pid
, 0 };
951 return (find_inferior (&all_threads
,
952 second_thread_of_pid_p
, &counter
) == NULL
);
958 linux_kill_one_lwp (struct lwp_info
*lwp
)
960 int pid
= lwpid_of (lwp
);
962 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
963 there is no signal context, and ptrace(PTRACE_KILL) (or
964 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
965 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
966 alternative is to kill with SIGKILL. We only need one SIGKILL
967 per process, not one for each thread. But since we still support
968 linuxthreads, and we also support debugging programs using raw
969 clone without CLONE_THREAD, we send one for each thread. For
970 years, we used PTRACE_KILL only, so we're being a bit paranoid
971 about some old kernels where PTRACE_KILL might work better
972 (dubious if there are any such, but that's why it's paranoia), so
973 we try SIGKILL first, PTRACE_KILL second, and so we're fine
980 "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
981 target_pid_to_str (ptid_of (lwp
)),
982 errno
? strerror (errno
) : "OK");
985 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
988 "LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
989 target_pid_to_str (ptid_of (lwp
)),
990 errno
? strerror (errno
) : "OK");
993 /* Callback for `find_inferior'. Kills an lwp of a given process,
994 except the leader. */
997 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
999 struct thread_info
*thread
= (struct thread_info
*) entry
;
1000 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1002 int pid
= * (int *) args
;
1004 if (ptid_get_pid (entry
->id
) != pid
)
1007 /* We avoid killing the first thread here, because of a Linux kernel (at
1008 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1009 the children get a chance to be reaped, it will remain a zombie
1012 if (lwpid_of (lwp
) == pid
)
1015 fprintf (stderr
, "lkop: is last of process %s\n",
1016 target_pid_to_str (entry
->id
));
1022 linux_kill_one_lwp (lwp
);
1024 /* Make sure it died. The loop is most likely unnecessary. */
1025 pid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
1026 } while (pid
> 0 && WIFSTOPPED (wstat
));
1032 linux_kill (int pid
)
1034 struct process_info
*process
;
1035 struct lwp_info
*lwp
;
1039 process
= find_process_pid (pid
);
1040 if (process
== NULL
)
1043 /* If we're killing a running inferior, make sure it is stopped
1044 first, as PTRACE_KILL will not work otherwise. */
1045 stop_all_lwps (0, NULL
);
1047 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1049 /* See the comment in linux_kill_one_lwp. We did not kill the first
1050 thread in the list, so do so now. */
1051 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1056 fprintf (stderr
, "lk_1: cannot find lwp %ld, for pid: %d\n",
1057 lwpid_of (lwp
), pid
);
1062 fprintf (stderr
, "lk_1: killing lwp %ld, for pid: %d\n",
1063 lwpid_of (lwp
), pid
);
1067 linux_kill_one_lwp (lwp
);
1069 /* Make sure it died. The loop is most likely unnecessary. */
1070 lwpid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
1071 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
1074 the_target
->mourn (process
);
1076 /* Since we presently can only stop all lwps of all processes, we
1077 need to unstop lwps of other processes. */
1078 unstop_all_lwps (0, NULL
);
1082 /* Get pending signal of THREAD, for detaching purposes. This is the
1083 signal the thread last stopped for, which we need to deliver to the
1084 thread when detaching, otherwise, it'd be suppressed/lost. */
1087 get_detach_signal (struct thread_info
*thread
)
1089 enum gdb_signal signo
= GDB_SIGNAL_0
;
1091 struct lwp_info
*lp
= get_thread_lwp (thread
);
1093 if (lp
->status_pending_p
)
1094 status
= lp
->status_pending
;
1097 /* If the thread had been suspended by gdbserver, and it stopped
1098 cleanly, then it'll have stopped with SIGSTOP. But we don't
1099 want to deliver that SIGSTOP. */
1100 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1101 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1104 /* Otherwise, we may need to deliver the signal we
1106 status
= lp
->last_status
;
1109 if (!WIFSTOPPED (status
))
1113 "GPS: lwp %s hasn't stopped: no pending signal\n",
1114 target_pid_to_str (ptid_of (lp
)));
1118 /* Extended wait statuses aren't real SIGTRAPs. */
1119 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1123 "GPS: lwp %s had stopped with extended "
1124 "status: no pending signal\n",
1125 target_pid_to_str (ptid_of (lp
)));
1129 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1131 if (program_signals_p
&& !program_signals
[signo
])
1135 "GPS: lwp %s had signal %s, but it is in nopass state\n",
1136 target_pid_to_str (ptid_of (lp
)),
1137 gdb_signal_to_string (signo
));
1140 else if (!program_signals_p
1141 /* If we have no way to know which signals GDB does not
1142 want to have passed to the program, assume
1143 SIGTRAP/SIGINT, which is GDB's default. */
1144 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1148 "GPS: lwp %s had signal %s, "
1149 "but we don't know if we should pass it. Default to not.\n",
1150 target_pid_to_str (ptid_of (lp
)),
1151 gdb_signal_to_string (signo
));
1158 "GPS: lwp %s has pending signal %s: delivering it.\n",
1159 target_pid_to_str (ptid_of (lp
)),
1160 gdb_signal_to_string (signo
));
1162 return WSTOPSIG (status
);
1167 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1169 struct thread_info
*thread
= (struct thread_info
*) entry
;
1170 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1171 int pid
= * (int *) args
;
1174 if (ptid_get_pid (entry
->id
) != pid
)
1177 /* If there is a pending SIGSTOP, get rid of it. */
1178 if (lwp
->stop_expected
)
1182 "Sending SIGCONT to %s\n",
1183 target_pid_to_str (ptid_of (lwp
)));
1185 kill_lwp (lwpid_of (lwp
), SIGCONT
);
1186 lwp
->stop_expected
= 0;
1189 /* Flush any pending changes to the process's registers. */
1190 regcache_invalidate_thread (get_lwp_thread (lwp
));
1192 /* Pass on any pending signal for this thread. */
1193 sig
= get_detach_signal (thread
);
1195 /* Finally, let it resume. */
1196 if (the_low_target
.prepare_to_resume
!= NULL
)
1197 the_low_target
.prepare_to_resume (lwp
);
1198 if (ptrace (PTRACE_DETACH
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1199 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1200 error (_("Can't detach %s: %s"),
1201 target_pid_to_str (ptid_of (lwp
)),
1209 linux_detach (int pid
)
1211 struct process_info
*process
;
1213 process
= find_process_pid (pid
);
1214 if (process
== NULL
)
1217 /* Stop all threads before detaching. First, ptrace requires that
1218 the thread is stopped to sucessfully detach. Second, thread_db
1219 may need to uninstall thread event breakpoints from memory, which
1220 only works with a stopped process anyway. */
1221 stop_all_lwps (0, NULL
);
1223 #ifdef USE_THREAD_DB
1224 thread_db_detach (process
);
1227 /* Stabilize threads (move out of jump pads). */
1228 stabilize_threads ();
1230 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1232 the_target
->mourn (process
);
1234 /* Since we presently can only stop all lwps of all processes, we
1235 need to unstop lwps of other processes. */
1236 unstop_all_lwps (0, NULL
);
1240 /* Remove all LWPs that belong to process PROC from the lwp list. */
1243 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1245 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1246 struct process_info
*process
= proc
;
1248 if (pid_of (lwp
) == pid_of (process
))
1255 linux_mourn (struct process_info
*process
)
1257 struct process_info_private
*priv
;
1259 #ifdef USE_THREAD_DB
1260 thread_db_mourn (process
);
1263 find_inferior (&all_lwps
, delete_lwp_callback
, process
);
1265 /* Freeing all private data. */
1266 priv
= process
->private;
1267 free (priv
->arch_private
);
1269 process
->private = NULL
;
1271 remove_process (process
);
1275 linux_join (int pid
)
1280 ret
= my_waitpid (pid
, &status
, 0);
1281 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1283 } while (ret
!= -1 || errno
!= ECHILD
);
1286 /* Return nonzero if the given thread is still alive. */
1288 linux_thread_alive (ptid_t ptid
)
1290 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1292 /* We assume we always know if a thread exits. If a whole process
1293 exited but we still haven't been able to report it to GDB, we'll
1294 hold on to the last lwp of the dead process. */
1301 /* Return 1 if this lwp has an interesting status pending. */
1303 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1305 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1306 ptid_t ptid
= * (ptid_t
*) arg
;
1307 struct thread_info
*thread
;
1309 /* Check if we're only interested in events from a specific process
1311 if (!ptid_equal (minus_one_ptid
, ptid
)
1312 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->head
.id
))
1315 thread
= get_lwp_thread (lwp
);
1317 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1318 report any status pending the LWP may have. */
1319 if (thread
->last_resume_kind
== resume_stop
1320 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1323 return lwp
->status_pending_p
;
1327 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1329 ptid_t ptid
= *(ptid_t
*) data
;
1332 if (ptid_get_lwp (ptid
) != 0)
1333 lwp
= ptid_get_lwp (ptid
);
1335 lwp
= ptid_get_pid (ptid
);
1337 if (ptid_get_lwp (entry
->id
) == lwp
)
1344 find_lwp_pid (ptid_t ptid
)
1346 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1349 static struct lwp_info
*
1350 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1353 int to_wait_for
= -1;
1354 struct lwp_info
*child
= NULL
;
1357 fprintf (stderr
, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1359 if (ptid_equal (ptid
, minus_one_ptid
))
1360 to_wait_for
= -1; /* any child */
1362 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1368 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1369 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1372 perror_with_name ("waitpid");
1375 && (!WIFSTOPPED (*wstatp
)
1376 || (WSTOPSIG (*wstatp
) != 32
1377 && WSTOPSIG (*wstatp
) != 33)))
1378 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
1380 child
= find_lwp_pid (pid_to_ptid (ret
));
1382 /* If we didn't find a process, one of two things presumably happened:
1383 - A process we started and then detached from has exited. Ignore it.
1384 - A process we are controlling has forked and the new child's stop
1385 was reported to us by the kernel. Save its PID. */
1386 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1388 add_to_pid_list (&stopped_pids
, ret
, *wstatp
);
1391 else if (child
== NULL
)
1396 child
->last_status
= *wstatp
;
1398 if (WIFSTOPPED (*wstatp
))
1400 struct process_info
*proc
;
1402 /* Architecture-specific setup after inferior is running. This
1403 needs to happen after we have attached to the inferior and it
1404 is stopped for the first time, but before we access any
1405 inferior registers. */
1406 proc
= find_process_pid (pid_of (child
));
1407 if (proc
->private->new_inferior
)
1409 struct thread_info
*saved_inferior
;
1411 saved_inferior
= current_inferior
;
1412 current_inferior
= get_lwp_thread (child
);
1414 the_low_target
.arch_setup ();
1416 current_inferior
= saved_inferior
;
1418 proc
->private->new_inferior
= 0;
1422 /* Fetch the possibly triggered data watchpoint info and store it in
1425 On some archs, like x86, that use debug registers to set
1426 watchpoints, it's possible that the way to know which watched
1427 address trapped, is to check the register that is used to select
1428 which address to watch. Problem is, between setting the
1429 watchpoint and reading back which data address trapped, the user
1430 may change the set of watchpoints, and, as a consequence, GDB
1431 changes the debug registers in the inferior. To avoid reading
1432 back a stale stopped-data-address when that happens, we cache in
1433 LP the fact that a watchpoint trapped, and the corresponding data
1434 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1435 changes the debug registers meanwhile, we have the cached data we
1438 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1440 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1442 child
->stopped_by_watchpoint
= 0;
1446 struct thread_info
*saved_inferior
;
1448 saved_inferior
= current_inferior
;
1449 current_inferior
= get_lwp_thread (child
);
1451 child
->stopped_by_watchpoint
1452 = the_low_target
.stopped_by_watchpoint ();
1454 if (child
->stopped_by_watchpoint
)
1456 if (the_low_target
.stopped_data_address
!= NULL
)
1457 child
->stopped_data_address
1458 = the_low_target
.stopped_data_address ();
1460 child
->stopped_data_address
= 0;
1463 current_inferior
= saved_inferior
;
1467 /* Store the STOP_PC, with adjustment applied. This depends on the
1468 architecture being defined already (so that CHILD has a valid
1469 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1471 if (WIFSTOPPED (*wstatp
))
1472 child
->stop_pc
= get_stop_pc (child
);
1475 && WIFSTOPPED (*wstatp
)
1476 && the_low_target
.get_pc
!= NULL
)
1478 struct thread_info
*saved_inferior
= current_inferior
;
1479 struct regcache
*regcache
;
1482 current_inferior
= get_lwp_thread (child
);
1483 regcache
= get_thread_regcache (current_inferior
, 1);
1484 pc
= (*the_low_target
.get_pc
) (regcache
);
1485 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1486 current_inferior
= saved_inferior
;
1492 /* This function should only be called if the LWP got a SIGTRAP.
1494 Handle any tracepoint steps or hits. Return true if a tracepoint
1495 event was handled, 0 otherwise. */
1498 handle_tracepoints (struct lwp_info
*lwp
)
1500 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1501 int tpoint_related_event
= 0;
1503 /* If this tracepoint hit causes a tracing stop, we'll immediately
1504 uninsert tracepoints. To do this, we temporarily pause all
1505 threads, unpatch away, and then unpause threads. We need to make
1506 sure the unpausing doesn't resume LWP too. */
1509 /* And we need to be sure that any all-threads-stopping doesn't try
1510 to move threads out of the jump pads, as it could deadlock the
1511 inferior (LWP could be in the jump pad, maybe even holding the
1514 /* Do any necessary step collect actions. */
1515 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1517 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1519 /* See if we just hit a tracepoint and do its main collect
1521 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1525 gdb_assert (lwp
->suspended
== 0);
1526 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1528 if (tpoint_related_event
)
1531 fprintf (stderr
, "got a tracepoint event\n");
1538 /* Convenience wrapper. Returns true if LWP is presently collecting a
1542 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1543 struct fast_tpoint_collect_status
*status
)
1545 CORE_ADDR thread_area
;
1547 if (the_low_target
.get_thread_area
== NULL
)
1550 /* Get the thread area address. This is used to recognize which
1551 thread is which when tracing with the in-process agent library.
1552 We don't read anything from the address, and treat it as opaque;
1553 it's the address itself that we assume is unique per-thread. */
1554 if ((*the_low_target
.get_thread_area
) (lwpid_of (lwp
), &thread_area
) == -1)
1557 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1560 /* The reason we resume in the caller, is because we want to be able
1561 to pass lwp->status_pending as WSTAT, and we need to clear
1562 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1563 refuses to resume. */
1566 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1568 struct thread_info
*saved_inferior
;
1570 saved_inferior
= current_inferior
;
1571 current_inferior
= get_lwp_thread (lwp
);
1574 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1575 && supports_fast_tracepoints ()
1576 && agent_loaded_p ())
1578 struct fast_tpoint_collect_status status
;
1583 Checking whether LWP %ld needs to move out of the jump pad.\n",
1586 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1589 || (WSTOPSIG (*wstat
) != SIGILL
1590 && WSTOPSIG (*wstat
) != SIGFPE
1591 && WSTOPSIG (*wstat
) != SIGSEGV
1592 && WSTOPSIG (*wstat
) != SIGBUS
))
1594 lwp
->collecting_fast_tracepoint
= r
;
1598 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1600 /* Haven't executed the original instruction yet.
1601 Set breakpoint there, and wait till it's hit,
1602 then single-step until exiting the jump pad. */
1603 lwp
->exit_jump_pad_bkpt
1604 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1609 Checking whether LWP %ld needs to move out of the jump pad...it does\n",
1611 current_inferior
= saved_inferior
;
1618 /* If we get a synchronous signal while collecting, *and*
1619 while executing the (relocated) original instruction,
1620 reset the PC to point at the tpoint address, before
1621 reporting to GDB. Otherwise, it's an IPA lib bug: just
1622 report the signal to GDB, and pray for the best. */
1624 lwp
->collecting_fast_tracepoint
= 0;
1627 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1628 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1631 struct regcache
*regcache
;
1633 /* The si_addr on a few signals references the address
1634 of the faulting instruction. Adjust that as
1636 if ((WSTOPSIG (*wstat
) == SIGILL
1637 || WSTOPSIG (*wstat
) == SIGFPE
1638 || WSTOPSIG (*wstat
) == SIGBUS
1639 || WSTOPSIG (*wstat
) == SIGSEGV
)
1640 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
),
1641 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1642 /* Final check just to make sure we don't clobber
1643 the siginfo of non-kernel-sent signals. */
1644 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1646 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1647 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
),
1648 (PTRACE_TYPE_ARG3
) 0, &info
);
1651 regcache
= get_thread_regcache (get_lwp_thread (lwp
), 1);
1652 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1653 lwp
->stop_pc
= status
.tpoint_addr
;
1655 /* Cancel any fast tracepoint lock this thread was
1657 force_unlock_trace_buffer ();
1660 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1664 "Cancelling fast exit-jump-pad: removing bkpt. "
1665 "stopping all threads momentarily.\n");
1667 stop_all_lwps (1, lwp
);
1668 cancel_breakpoints ();
1670 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1671 lwp
->exit_jump_pad_bkpt
= NULL
;
1673 unstop_all_lwps (1, lwp
);
1675 gdb_assert (lwp
->suspended
>= 0);
1682 Checking whether LWP %ld needs to move out of the jump pad...no\n",
1685 current_inferior
= saved_inferior
;
1689 /* Enqueue one signal in the "signals to report later when out of the
1693 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1695 struct pending_signals
*p_sig
;
1699 Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat
), lwpid_of (lwp
));
1703 struct pending_signals
*sig
;
1705 for (sig
= lwp
->pending_signals_to_report
;
1709 " Already queued %d\n",
1712 fprintf (stderr
, " (no more currently queued signals)\n");
1715 /* Don't enqueue non-RT signals if they are already in the deferred
1716 queue. (SIGSTOP being the easiest signal to see ending up here
1718 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1720 struct pending_signals
*sig
;
1722 for (sig
= lwp
->pending_signals_to_report
;
1726 if (sig
->signal
== WSTOPSIG (*wstat
))
1730 "Not requeuing already queued non-RT signal %d"
1739 p_sig
= xmalloc (sizeof (*p_sig
));
1740 p_sig
->prev
= lwp
->pending_signals_to_report
;
1741 p_sig
->signal
= WSTOPSIG (*wstat
);
1742 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1743 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1746 lwp
->pending_signals_to_report
= p_sig
;
1749 /* Dequeue one signal from the "signals to report later when out of
1750 the jump pad" list. */
1753 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1755 if (lwp
->pending_signals_to_report
!= NULL
)
1757 struct pending_signals
**p_sig
;
1759 p_sig
= &lwp
->pending_signals_to_report
;
1760 while ((*p_sig
)->prev
!= NULL
)
1761 p_sig
= &(*p_sig
)->prev
;
1763 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1764 if ((*p_sig
)->info
.si_signo
!= 0)
1765 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
1771 fprintf (stderr
, "Reporting deferred signal %d for LWP %ld.\n",
1772 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1776 struct pending_signals
*sig
;
1778 for (sig
= lwp
->pending_signals_to_report
;
1782 " Still queued %d\n",
1785 fprintf (stderr
, " (no more queued signals)\n");
1794 /* Arrange for a breakpoint to be hit again later. We don't keep the
1795 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1796 will handle the current event, eventually we will resume this LWP,
1797 and this breakpoint will trap again. */
1800 cancel_breakpoint (struct lwp_info
*lwp
)
1802 struct thread_info
*saved_inferior
;
1804 /* There's nothing to do if we don't support breakpoints. */
1805 if (!supports_breakpoints ())
1808 /* breakpoint_at reads from current inferior. */
1809 saved_inferior
= current_inferior
;
1810 current_inferior
= get_lwp_thread (lwp
);
1812 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1816 "CB: Push back breakpoint for %s\n",
1817 target_pid_to_str (ptid_of (lwp
)));
1819 /* Back up the PC if necessary. */
1820 if (the_low_target
.decr_pc_after_break
)
1822 struct regcache
*regcache
1823 = get_thread_regcache (current_inferior
, 1);
1824 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1827 current_inferior
= saved_inferior
;
1834 "CB: No breakpoint found at %s for [%s]\n",
1835 paddress (lwp
->stop_pc
),
1836 target_pid_to_str (ptid_of (lwp
)));
1839 current_inferior
= saved_inferior
;
1843 /* When the event-loop is doing a step-over, this points at the thread
1845 ptid_t step_over_bkpt
;
1847 /* Wait for an event from child PID. If PID is -1, wait for any
1848 child. Store the stop status through the status pointer WSTAT.
1849 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1850 event was found and OPTIONS contains WNOHANG. Return the PID of
1851 the stopped child otherwise. */
1854 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1856 struct lwp_info
*event_child
, *requested_child
;
1860 requested_child
= NULL
;
1862 /* Check for a lwp with a pending status. */
1864 if (ptid_equal (ptid
, minus_one_ptid
) || ptid_is_pid (ptid
))
1866 event_child
= (struct lwp_info
*)
1867 find_inferior (&all_lwps
, status_pending_p_callback
, &ptid
);
1868 if (debug_threads
&& event_child
)
1869 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1873 requested_child
= find_lwp_pid (ptid
);
1875 if (stopping_threads
== NOT_STOPPING_THREADS
1876 && requested_child
->status_pending_p
1877 && requested_child
->collecting_fast_tracepoint
)
1879 enqueue_one_deferred_signal (requested_child
,
1880 &requested_child
->status_pending
);
1881 requested_child
->status_pending_p
= 0;
1882 requested_child
->status_pending
= 0;
1883 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1886 if (requested_child
->suspended
1887 && requested_child
->status_pending_p
)
1888 fatal ("requesting an event out of a suspended child?");
1890 if (requested_child
->status_pending_p
)
1891 event_child
= requested_child
;
1894 if (event_child
!= NULL
)
1897 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1898 lwpid_of (event_child
), event_child
->status_pending
);
1899 *wstat
= event_child
->status_pending
;
1900 event_child
->status_pending_p
= 0;
1901 event_child
->status_pending
= 0;
1902 current_inferior
= get_lwp_thread (event_child
);
1903 return lwpid_of (event_child
);
1906 if (ptid_is_pid (ptid
))
1908 /* A request to wait for a specific tgid. This is not possible
1909 with waitpid, so instead, we wait for any child, and leave
1910 children we're not interested in right now with a pending
1911 status to report later. */
1912 wait_ptid
= minus_one_ptid
;
1917 /* We only enter this loop if no process has a pending wait status. Thus
1918 any action taken in response to a wait status inside this loop is
1919 responding as soon as we detect the status, not after any pending
1923 event_child
= linux_wait_for_lwp (wait_ptid
, wstat
, options
);
1925 if ((options
& WNOHANG
) && event_child
== NULL
)
1928 fprintf (stderr
, "WNOHANG set, no event found\n");
1932 if (event_child
== NULL
)
1933 error ("event from unknown child");
1935 if (ptid_is_pid (ptid
)
1936 && ptid_get_pid (ptid
) != ptid_get_pid (ptid_of (event_child
)))
1938 if (! WIFSTOPPED (*wstat
))
1939 mark_lwp_dead (event_child
, *wstat
);
1942 event_child
->status_pending_p
= 1;
1943 event_child
->status_pending
= *wstat
;
1948 current_inferior
= get_lwp_thread (event_child
);
1950 /* Check for thread exit. */
1951 if (! WIFSTOPPED (*wstat
))
1954 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1956 /* If the last thread is exiting, just return. */
1957 if (last_thread_of_process_p (current_inferior
))
1960 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1961 lwpid_of (event_child
));
1962 return lwpid_of (event_child
);
1967 current_inferior
= (struct thread_info
*) all_threads
.head
;
1969 fprintf (stderr
, "Current inferior is now %ld\n",
1970 lwpid_of (get_thread_lwp (current_inferior
)));
1974 current_inferior
= NULL
;
1976 fprintf (stderr
, "Current inferior is now <NULL>\n");
1979 /* If we were waiting for this particular child to do something...
1980 well, it did something. */
1981 if (requested_child
!= NULL
)
1983 int lwpid
= lwpid_of (event_child
);
1985 /* Cancel the step-over operation --- the thread that
1986 started it is gone. */
1987 if (finish_step_over (event_child
))
1988 unstop_all_lwps (1, event_child
);
1989 delete_lwp (event_child
);
1993 delete_lwp (event_child
);
1995 /* Wait for a more interesting event. */
1999 if (event_child
->must_set_ptrace_flags
)
2001 linux_enable_event_reporting (lwpid_of (event_child
));
2002 event_child
->must_set_ptrace_flags
= 0;
2005 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
2006 && *wstat
>> 16 != 0)
2008 handle_extended_wait (event_child
, *wstat
);
2012 if (WIFSTOPPED (*wstat
)
2013 && WSTOPSIG (*wstat
) == SIGSTOP
2014 && event_child
->stop_expected
)
2019 fprintf (stderr
, "Expected stop.\n");
2020 event_child
->stop_expected
= 0;
2022 should_stop
= (current_inferior
->last_resume_kind
== resume_stop
2023 || stopping_threads
!= NOT_STOPPING_THREADS
);
2027 linux_resume_one_lwp (event_child
,
2028 event_child
->stepping
, 0, NULL
);
2033 return lwpid_of (event_child
);
2040 /* Count the LWP's that have had events. */
2043 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2045 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2046 struct thread_info
*thread
= get_lwp_thread (lp
);
2049 gdb_assert (count
!= NULL
);
2051 /* Count only resumed LWPs that have a SIGTRAP event pending that
2052 should be reported to GDB. */
2053 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2054 && thread
->last_resume_kind
!= resume_stop
2055 && lp
->status_pending_p
2056 && WIFSTOPPED (lp
->status_pending
)
2057 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2058 && !breakpoint_inserted_here (lp
->stop_pc
))
2064 /* Select the LWP (if any) that is currently being single-stepped. */
2067 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2069 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2070 struct thread_info
*thread
= get_lwp_thread (lp
);
2072 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2073 && thread
->last_resume_kind
== resume_step
2074 && lp
->status_pending_p
)
2080 /* Select the Nth LWP that has had a SIGTRAP event that should be
2084 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2086 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2087 struct thread_info
*thread
= get_lwp_thread (lp
);
2088 int *selector
= data
;
2090 gdb_assert (selector
!= NULL
);
2092 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2093 if (thread
->last_resume_kind
!= resume_stop
2094 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2095 && lp
->status_pending_p
2096 && WIFSTOPPED (lp
->status_pending
)
2097 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2098 && !breakpoint_inserted_here (lp
->stop_pc
))
2099 if ((*selector
)-- == 0)
2106 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2108 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2109 struct thread_info
*thread
= get_lwp_thread (lp
);
2110 struct lwp_info
*event_lp
= data
;
2112 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2116 /* If a LWP other than the LWP that we're reporting an event for has
2117 hit a GDB breakpoint (as opposed to some random trap signal),
2118 then just arrange for it to hit it again later. We don't keep
2119 the SIGTRAP status and don't forward the SIGTRAP signal to the
2120 LWP. We will handle the current event, eventually we will resume
2121 all LWPs, and this one will get its breakpoint trap again.
2123 If we do not do this, then we run the risk that the user will
2124 delete or disable the breakpoint, but the LWP will have already
2127 if (thread
->last_resume_kind
!= resume_stop
2128 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2129 && lp
->status_pending_p
2130 && WIFSTOPPED (lp
->status_pending
)
2131 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2133 && !lp
->stopped_by_watchpoint
2134 && cancel_breakpoint (lp
))
2135 /* Throw away the SIGTRAP. */
2136 lp
->status_pending_p
= 0;
2142 linux_cancel_breakpoints (void)
2144 find_inferior (&all_lwps
, cancel_breakpoints_callback
, NULL
);
2147 /* Select one LWP out of those that have events pending. */
2150 select_event_lwp (struct lwp_info
**orig_lp
)
2153 int random_selector
;
2154 struct lwp_info
*event_lp
;
2156 /* Give preference to any LWP that is being single-stepped. */
2158 = (struct lwp_info
*) find_inferior (&all_lwps
,
2159 select_singlestep_lwp_callback
, NULL
);
2160 if (event_lp
!= NULL
)
2164 "SEL: Select single-step %s\n",
2165 target_pid_to_str (ptid_of (event_lp
)));
2169 /* No single-stepping LWP. Select one at random, out of those
2170 which have had SIGTRAP events. */
2172 /* First see how many SIGTRAP events we have. */
2173 find_inferior (&all_lwps
, count_events_callback
, &num_events
);
2175 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2176 random_selector
= (int)
2177 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2179 if (debug_threads
&& num_events
> 1)
2181 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2182 num_events
, random_selector
);
2184 event_lp
= (struct lwp_info
*) find_inferior (&all_lwps
,
2185 select_event_lwp_callback
,
2189 if (event_lp
!= NULL
)
2191 /* Switch the event LWP. */
2192 *orig_lp
= event_lp
;
2196 /* Decrement the suspend count of an LWP. */
2199 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2201 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2203 /* Ignore EXCEPT. */
2209 gdb_assert (lwp
->suspended
>= 0);
2213 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2217 unsuspend_all_lwps (struct lwp_info
*except
)
2219 find_inferior (&all_lwps
, unsuspend_one_lwp
, except
);
2222 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2223 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2225 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2226 static ptid_t
linux_wait_1 (ptid_t ptid
,
2227 struct target_waitstatus
*ourstatus
,
2228 int target_options
);
2230 /* Stabilize threads (move out of jump pads).
2232 If a thread is midway collecting a fast tracepoint, we need to
2233 finish the collection and move it out of the jump pad before
2234 reporting the signal.
2236 This avoids recursion while collecting (when a signal arrives
2237 midway, and the signal handler itself collects), which would trash
2238 the trace buffer. In case the user set a breakpoint in a signal
2239 handler, this avoids the backtrace showing the jump pad, etc..
2240 Most importantly, there are certain things we can't do safely if
2241 threads are stopped in a jump pad (or in its callee's). For
2244 - starting a new trace run. A thread still collecting the
2245 previous run, could trash the trace buffer when resumed. The trace
2246 buffer control structures would have been reset but the thread had
2247 no way to tell. The thread could even midway memcpy'ing to the
2248 buffer, which would mean that when resumed, it would clobber the
2249 trace buffer that had been set for a new run.
2251 - we can't rewrite/reuse the jump pads for new tracepoints
2252 safely. Say you do tstart while a thread is stopped midway while
2253 collecting. When the thread is later resumed, it finishes the
2254 collection, and returns to the jump pad, to execute the original
2255 instruction that was under the tracepoint jump at the time the
2256 older run had been started. If the jump pad had been rewritten
2257 since for something else in the new run, the thread would now
2258 execute the wrong / random instructions. */
2261 linux_stabilize_threads (void)
2263 struct thread_info
*save_inferior
;
2264 struct lwp_info
*lwp_stuck
;
2267 = (struct lwp_info
*) find_inferior (&all_lwps
,
2268 stuck_in_jump_pad_callback
, NULL
);
2269 if (lwp_stuck
!= NULL
)
2272 fprintf (stderr
, "can't stabilize, LWP %ld is stuck in jump pad\n",
2273 lwpid_of (lwp_stuck
));
2277 save_inferior
= current_inferior
;
2279 stabilizing_threads
= 1;
2282 for_each_inferior (&all_lwps
, move_out_of_jump_pad_callback
);
2284 /* Loop until all are stopped out of the jump pads. */
2285 while (find_inferior (&all_lwps
, lwp_running
, NULL
) != NULL
)
2287 struct target_waitstatus ourstatus
;
2288 struct lwp_info
*lwp
;
2291 /* Note that we go through the full wait even loop. While
2292 moving threads out of jump pad, we need to be able to step
2293 over internal breakpoints and such. */
2294 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2296 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2298 lwp
= get_thread_lwp (current_inferior
);
2303 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2304 || current_inferior
->last_resume_kind
== resume_stop
)
2306 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2307 enqueue_one_deferred_signal (lwp
, &wstat
);
2312 find_inferior (&all_lwps
, unsuspend_one_lwp
, NULL
);
2314 stabilizing_threads
= 0;
2316 current_inferior
= save_inferior
;
2321 = (struct lwp_info
*) find_inferior (&all_lwps
,
2322 stuck_in_jump_pad_callback
, NULL
);
2323 if (lwp_stuck
!= NULL
)
2324 fprintf (stderr
, "couldn't stabilize, LWP %ld got stuck in jump pad\n",
2325 lwpid_of (lwp_stuck
));
2329 /* Wait for process, returns status. */
2332 linux_wait_1 (ptid_t ptid
,
2333 struct target_waitstatus
*ourstatus
, int target_options
)
2336 struct lwp_info
*event_child
;
2339 int step_over_finished
;
2340 int bp_explains_trap
;
2341 int maybe_internal_trap
;
2346 /* Translate generic target options into linux options. */
2348 if (target_options
& TARGET_WNOHANG
)
2352 bp_explains_trap
= 0;
2355 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2357 /* If we were only supposed to resume one thread, only wait for
2358 that thread - if it's still alive. If it died, however - which
2359 can happen if we're coming from the thread death case below -
2360 then we need to make sure we restart the other threads. We could
2361 pick a thread at random or restart all; restarting all is less
2364 && !ptid_equal (cont_thread
, null_ptid
)
2365 && !ptid_equal (cont_thread
, minus_one_ptid
))
2367 struct thread_info
*thread
;
2369 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2372 /* No stepping, no signal - unless one is pending already, of course. */
2375 struct thread_resume resume_info
;
2376 resume_info
.thread
= minus_one_ptid
;
2377 resume_info
.kind
= resume_continue
;
2378 resume_info
.sig
= 0;
2379 linux_resume (&resume_info
, 1);
2385 if (ptid_equal (step_over_bkpt
, null_ptid
))
2386 pid
= linux_wait_for_event (ptid
, &w
, options
);
2390 fprintf (stderr
, "step_over_bkpt set [%s], doing a blocking wait\n",
2391 target_pid_to_str (step_over_bkpt
));
2392 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2395 if (pid
== 0) /* only if TARGET_WNOHANG */
2398 event_child
= get_thread_lwp (current_inferior
);
2400 /* If we are waiting for a particular child, and it exited,
2401 linux_wait_for_event will return its exit status. Similarly if
2402 the last child exited. If this is not the last child, however,
2403 do not report it as exited until there is a 'thread exited' response
2404 available in the remote protocol. Instead, just wait for another event.
2405 This should be safe, because if the thread crashed we will already
2406 have reported the termination signal to GDB; that should stop any
2407 in-progress stepping operations, etc.
2409 Report the exit status of the last thread to exit. This matches
2410 LinuxThreads' behavior. */
2412 if (last_thread_of_process_p (current_inferior
))
2414 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2418 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2419 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2423 "\nChild exited with retcode = %x \n",
2428 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2429 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2433 "\nChild terminated with signal = %x \n",
2438 return ptid_of (event_child
);
2443 if (!WIFSTOPPED (w
))
2447 /* If this event was not handled before, and is not a SIGTRAP, we
2448 report it. SIGILL and SIGSEGV are also treated as traps in case
2449 a breakpoint is inserted at the current PC. If this target does
2450 not support internal breakpoints at all, we also report the
2451 SIGTRAP without further processing; it's of no concern to us. */
2453 = (supports_breakpoints ()
2454 && (WSTOPSIG (w
) == SIGTRAP
2455 || ((WSTOPSIG (w
) == SIGILL
2456 || WSTOPSIG (w
) == SIGSEGV
)
2457 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2459 if (maybe_internal_trap
)
2461 /* Handle anything that requires bookkeeping before deciding to
2462 report the event or continue waiting. */
2464 /* First check if we can explain the SIGTRAP with an internal
2465 breakpoint, or if we should possibly report the event to GDB.
2466 Do this before anything that may remove or insert a
2468 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2470 /* We have a SIGTRAP, possibly a step-over dance has just
2471 finished. If so, tweak the state machine accordingly,
2472 reinsert breakpoints and delete any reinsert (software
2473 single-step) breakpoints. */
2474 step_over_finished
= finish_step_over (event_child
);
2476 /* Now invoke the callbacks of any internal breakpoints there. */
2477 check_breakpoints (event_child
->stop_pc
);
2479 /* Handle tracepoint data collecting. This may overflow the
2480 trace buffer, and cause a tracing stop, removing
2482 trace_event
= handle_tracepoints (event_child
);
2484 if (bp_explains_trap
)
2486 /* If we stepped or ran into an internal breakpoint, we've
2487 already handled it. So next time we resume (from this
2488 PC), we should step over it. */
2490 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2492 if (breakpoint_here (event_child
->stop_pc
))
2493 event_child
->need_step_over
= 1;
2498 /* We have some other signal, possibly a step-over dance was in
2499 progress, and it should be cancelled too. */
2500 step_over_finished
= finish_step_over (event_child
);
2503 /* We have all the data we need. Either report the event to GDB, or
2504 resume threads and keep waiting for more. */
2506 /* If we're collecting a fast tracepoint, finish the collection and
2507 move out of the jump pad before delivering a signal. See
2508 linux_stabilize_threads. */
2511 && WSTOPSIG (w
) != SIGTRAP
2512 && supports_fast_tracepoints ()
2513 && agent_loaded_p ())
2517 "Got signal %d for LWP %ld. Check if we need "
2518 "to defer or adjust it.\n",
2519 WSTOPSIG (w
), lwpid_of (event_child
));
2521 /* Allow debugging the jump pad itself. */
2522 if (current_inferior
->last_resume_kind
!= resume_step
2523 && maybe_move_out_of_jump_pad (event_child
, &w
))
2525 enqueue_one_deferred_signal (event_child
, &w
);
2529 "Signal %d for LWP %ld deferred (in jump pad)\n",
2530 WSTOPSIG (w
), lwpid_of (event_child
));
2532 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2537 if (event_child
->collecting_fast_tracepoint
)
2541 LWP %ld was trying to move out of the jump pad (%d). \
2542 Check if we're already there.\n",
2543 lwpid_of (event_child
),
2544 event_child
->collecting_fast_tracepoint
);
2548 event_child
->collecting_fast_tracepoint
2549 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2551 if (event_child
->collecting_fast_tracepoint
!= 1)
2553 /* No longer need this breakpoint. */
2554 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2558 "No longer need exit-jump-pad bkpt; removing it."
2559 "stopping all threads momentarily.\n");
2561 /* Other running threads could hit this breakpoint.
2562 We don't handle moribund locations like GDB does,
2563 instead we always pause all threads when removing
2564 breakpoints, so that any step-over or
2565 decr_pc_after_break adjustment is always taken
2566 care of while the breakpoint is still
2568 stop_all_lwps (1, event_child
);
2569 cancel_breakpoints ();
2571 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2572 event_child
->exit_jump_pad_bkpt
= NULL
;
2574 unstop_all_lwps (1, event_child
);
2576 gdb_assert (event_child
->suspended
>= 0);
2580 if (event_child
->collecting_fast_tracepoint
== 0)
2584 "fast tracepoint finished "
2585 "collecting successfully.\n");
2587 /* We may have a deferred signal to report. */
2588 if (dequeue_one_deferred_signal (event_child
, &w
))
2591 fprintf (stderr
, "dequeued one signal.\n");
2596 fprintf (stderr
, "no deferred signals.\n");
2598 if (stabilizing_threads
)
2600 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2601 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2602 return ptid_of (event_child
);
2608 /* Check whether GDB would be interested in this event. */
2610 /* If GDB is not interested in this signal, don't stop other
2611 threads, and don't report it to GDB. Just resume the inferior
2612 right away. We do this for threading-related signals as well as
2613 any that GDB specifically requested we ignore. But never ignore
2614 SIGSTOP if we sent it ourselves, and do not ignore signals when
2615 stepping - they may require special handling to skip the signal
2617 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2620 && current_inferior
->last_resume_kind
!= resume_step
2622 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2623 (current_process ()->private->thread_db
!= NULL
2624 && (WSTOPSIG (w
) == __SIGRTMIN
2625 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2628 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2629 && !(WSTOPSIG (w
) == SIGSTOP
2630 && current_inferior
->last_resume_kind
== resume_stop
))))
2632 siginfo_t info
, *info_p
;
2635 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
2636 WSTOPSIG (w
), lwpid_of (event_child
));
2638 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
),
2639 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
2643 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2644 WSTOPSIG (w
), info_p
);
2648 /* Note that all addresses are always "out of the step range" when
2649 there's no range to begin with. */
2650 in_step_range
= lwp_in_step_range (event_child
);
2652 /* If GDB wanted this thread to single step, and the thread is out
2653 of the step range, we always want to report the SIGTRAP, and let
2654 GDB handle it. Watchpoints should always be reported. So should
2655 signals we can't explain. A SIGTRAP we can't explain could be a
2656 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2657 do, we're be able to handle GDB breakpoints on top of internal
2658 breakpoints, by handling the internal breakpoint and still
2659 reporting the event to GDB. If we don't, we're out of luck, GDB
2660 won't see the breakpoint hit. */
2661 report_to_gdb
= (!maybe_internal_trap
2662 || (current_inferior
->last_resume_kind
== resume_step
2664 || event_child
->stopped_by_watchpoint
2665 || (!step_over_finished
&& !in_step_range
2666 && !bp_explains_trap
&& !trace_event
)
2667 || (gdb_breakpoint_here (event_child
->stop_pc
)
2668 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2669 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2671 run_breakpoint_commands (event_child
->stop_pc
);
2673 /* We found no reason GDB would want us to stop. We either hit one
2674 of our own breakpoints, or finished an internal step GDB
2675 shouldn't know about. */
2680 if (bp_explains_trap
)
2681 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2682 if (step_over_finished
)
2683 fprintf (stderr
, "Step-over finished.\n");
2685 fprintf (stderr
, "Tracepoint event.\n");
2686 if (lwp_in_step_range (event_child
))
2687 fprintf (stderr
, "Range stepping pc 0x%s [0x%s, 0x%s).\n",
2688 paddress (event_child
->stop_pc
),
2689 paddress (event_child
->step_range_start
),
2690 paddress (event_child
->step_range_end
));
2693 /* We're not reporting this breakpoint to GDB, so apply the
2694 decr_pc_after_break adjustment to the inferior's regcache
2697 if (the_low_target
.set_pc
!= NULL
)
2699 struct regcache
*regcache
2700 = get_thread_regcache (get_lwp_thread (event_child
), 1);
2701 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2704 /* We may have finished stepping over a breakpoint. If so,
2705 we've stopped and suspended all LWPs momentarily except the
2706 stepping one. This is where we resume them all again. We're
2707 going to keep waiting, so use proceed, which handles stepping
2708 over the next breakpoint. */
2710 fprintf (stderr
, "proceeding all threads.\n");
2712 if (step_over_finished
)
2713 unsuspend_all_lwps (event_child
);
2715 proceed_all_lwps ();
2721 if (current_inferior
->last_resume_kind
== resume_step
)
2723 if (event_child
->step_range_start
== event_child
->step_range_end
)
2724 fprintf (stderr
, "GDB wanted to single-step, reporting event.\n");
2725 else if (!lwp_in_step_range (event_child
))
2726 fprintf (stderr
, "Out of step range, reporting event.\n");
2728 if (event_child
->stopped_by_watchpoint
)
2729 fprintf (stderr
, "Stopped by watchpoint.\n");
2730 if (gdb_breakpoint_here (event_child
->stop_pc
))
2731 fprintf (stderr
, "Stopped by GDB breakpoint.\n");
2733 fprintf (stderr
, "Hit a non-gdbserver trap event.\n");
2736 /* Alright, we're going to report a stop. */
2738 if (!non_stop
&& !stabilizing_threads
)
2740 /* In all-stop, stop all threads. */
2741 stop_all_lwps (0, NULL
);
2743 /* If we're not waiting for a specific LWP, choose an event LWP
2744 from among those that have had events. Giving equal priority
2745 to all LWPs that have had events helps prevent
2747 if (ptid_equal (ptid
, minus_one_ptid
))
2749 event_child
->status_pending_p
= 1;
2750 event_child
->status_pending
= w
;
2752 select_event_lwp (&event_child
);
2754 event_child
->status_pending_p
= 0;
2755 w
= event_child
->status_pending
;
2758 /* Now that we've selected our final event LWP, cancel any
2759 breakpoints in other LWPs that have hit a GDB breakpoint.
2760 See the comment in cancel_breakpoints_callback to find out
2762 find_inferior (&all_lwps
, cancel_breakpoints_callback
, event_child
);
2764 /* If we were going a step-over, all other threads but the stepping one
2765 had been paused in start_step_over, with their suspend counts
2766 incremented. We don't want to do a full unstop/unpause, because we're
2767 in all-stop mode (so we want threads stopped), but we still need to
2768 unsuspend the other threads, to decrement their `suspended' count
2770 if (step_over_finished
)
2771 unsuspend_all_lwps (event_child
);
2773 /* Stabilize threads (move out of jump pads). */
2774 stabilize_threads ();
2778 /* If we just finished a step-over, then all threads had been
2779 momentarily paused. In all-stop, that's fine, we want
2780 threads stopped by now anyway. In non-stop, we need to
2781 re-resume threads that GDB wanted to be running. */
2782 if (step_over_finished
)
2783 unstop_all_lwps (1, event_child
);
2786 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2788 if (current_inferior
->last_resume_kind
== resume_stop
2789 && WSTOPSIG (w
) == SIGSTOP
)
2791 /* A thread that has been requested to stop by GDB with vCont;t,
2792 and it stopped cleanly, so report as SIG0. The use of
2793 SIGSTOP is an implementation detail. */
2794 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2796 else if (current_inferior
->last_resume_kind
== resume_stop
2797 && WSTOPSIG (w
) != SIGSTOP
)
2799 /* A thread that has been requested to stop by GDB with vCont;t,
2800 but, it stopped for other reasons. */
2801 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2805 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2808 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2811 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
2812 target_pid_to_str (ptid_of (event_child
)),
2814 ourstatus
->value
.sig
);
2816 return ptid_of (event_child
);
2819 /* Get rid of any pending event in the pipe. */
2821 async_file_flush (void)
2827 ret
= read (linux_event_pipe
[0], &buf
, 1);
2828 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2831 /* Put something in the pipe, so the event loop wakes up. */
2833 async_file_mark (void)
2837 async_file_flush ();
2840 ret
= write (linux_event_pipe
[1], "+", 1);
2841 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2843 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2844 be awakened anyway. */
2848 linux_wait (ptid_t ptid
,
2849 struct target_waitstatus
*ourstatus
, int target_options
)
2854 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
2856 /* Flush the async file first. */
2857 if (target_is_async_p ())
2858 async_file_flush ();
2860 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
2862 /* If at least one stop was reported, there may be more. A single
2863 SIGCHLD can signal more than one child stop. */
2864 if (target_is_async_p ()
2865 && (target_options
& TARGET_WNOHANG
) != 0
2866 && !ptid_equal (event_ptid
, null_ptid
))
2872 /* Send a signal to an LWP. */
2875 kill_lwp (unsigned long lwpid
, int signo
)
2877 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2878 fails, then we are not using nptl threads and we should be using kill. */
2882 static int tkill_failed
;
2889 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2890 if (errno
!= ENOSYS
)
2897 return kill (lwpid
, signo
);
2901 linux_stop_lwp (struct lwp_info
*lwp
)
2907 send_sigstop (struct lwp_info
*lwp
)
2911 pid
= lwpid_of (lwp
);
2913 /* If we already have a pending stop signal for this process, don't
2915 if (lwp
->stop_expected
)
2918 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
2924 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
2926 lwp
->stop_expected
= 1;
2927 kill_lwp (pid
, SIGSTOP
);
2931 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
2933 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2935 /* Ignore EXCEPT. */
2946 /* Increment the suspend count of an LWP, and stop it, if not stopped
2949 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
2952 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2954 /* Ignore EXCEPT. */
2960 return send_sigstop_callback (entry
, except
);
2964 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
2966 /* It's dead, really. */
2969 /* Store the exit status for later. */
2970 lwp
->status_pending_p
= 1;
2971 lwp
->status_pending
= wstat
;
2973 /* Prevent trying to stop it. */
2976 /* No further stops are expected from a dead lwp. */
2977 lwp
->stop_expected
= 0;
2981 wait_for_sigstop (struct inferior_list_entry
*entry
)
2983 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2984 struct thread_info
*saved_inferior
;
2993 fprintf (stderr
, "wait_for_sigstop: LWP %ld already stopped\n",
2998 saved_inferior
= current_inferior
;
2999 if (saved_inferior
!= NULL
)
3000 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
3002 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3004 ptid
= lwp
->head
.id
;
3007 fprintf (stderr
, "wait_for_sigstop: pulling one event\n");
3009 pid
= linux_wait_for_event (ptid
, &wstat
, __WALL
);
3011 /* If we stopped with a non-SIGSTOP signal, save it for later
3012 and record the pending SIGSTOP. If the process exited, just
3014 if (WIFSTOPPED (wstat
))
3017 fprintf (stderr
, "LWP %ld stopped with signal %d\n",
3018 lwpid_of (lwp
), WSTOPSIG (wstat
));
3020 if (WSTOPSIG (wstat
) != SIGSTOP
)
3023 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
3024 lwpid_of (lwp
), wstat
);
3026 lwp
->status_pending_p
= 1;
3027 lwp
->status_pending
= wstat
;
3033 fprintf (stderr
, "Process %d exited while stopping LWPs\n", pid
);
3035 lwp
= find_lwp_pid (pid_to_ptid (pid
));
3038 /* Leave this status pending for the next time we're able to
3039 report it. In the mean time, we'll report this lwp as
3040 dead to GDB, so GDB doesn't try to read registers and
3041 memory from it. This can only happen if this was the
3042 last thread of the process; otherwise, PID is removed
3043 from the thread tables before linux_wait_for_event
3045 mark_lwp_dead (lwp
, wstat
);
3049 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3050 current_inferior
= saved_inferior
;
3054 fprintf (stderr
, "Previously current thread died.\n");
3058 /* We can't change the current inferior behind GDB's back,
3059 otherwise, a subsequent command may apply to the wrong
3061 current_inferior
= NULL
;
3065 /* Set a valid thread as current. */
3066 set_desired_inferior (0);
3071 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3072 move it out, because we need to report the stop event to GDB. For
3073 example, if the user puts a breakpoint in the jump pad, it's
3074 because she wants to debug it. */
3077 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3079 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3080 struct thread_info
*thread
= get_lwp_thread (lwp
);
3082 gdb_assert (lwp
->suspended
== 0);
3083 gdb_assert (lwp
->stopped
);
3085 /* Allow debugging the jump pad, gdb_collect, etc.. */
3086 return (supports_fast_tracepoints ()
3087 && agent_loaded_p ()
3088 && (gdb_breakpoint_here (lwp
->stop_pc
)
3089 || lwp
->stopped_by_watchpoint
3090 || thread
->last_resume_kind
== resume_step
)
3091 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3095 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3097 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3098 struct thread_info
*thread
= get_lwp_thread (lwp
);
3101 gdb_assert (lwp
->suspended
== 0);
3102 gdb_assert (lwp
->stopped
);
3104 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3106 /* Allow debugging the jump pad, gdb_collect, etc. */
3107 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3108 && !lwp
->stopped_by_watchpoint
3109 && thread
->last_resume_kind
!= resume_step
3110 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3114 "LWP %ld needs stabilizing (in jump pad)\n",
3119 lwp
->status_pending_p
= 0;
3120 enqueue_one_deferred_signal (lwp
, wstat
);
3124 "Signal %d for LWP %ld deferred "
3126 WSTOPSIG (*wstat
), lwpid_of (lwp
));
3129 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3136 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3138 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3147 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3148 If SUSPEND, then also increase the suspend count of every LWP,
3152 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3154 /* Should not be called recursively. */
3155 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3157 stopping_threads
= (suspend
3158 ? STOPPING_AND_SUSPENDING_THREADS
3159 : STOPPING_THREADS
);
3162 find_inferior (&all_lwps
, suspend_and_send_sigstop_callback
, except
);
3164 find_inferior (&all_lwps
, send_sigstop_callback
, except
);
3165 for_each_inferior (&all_lwps
, wait_for_sigstop
);
3166 stopping_threads
= NOT_STOPPING_THREADS
;
3169 /* Resume execution of the inferior process.
3170 If STEP is nonzero, single-step it.
3171 If SIGNAL is nonzero, give it that signal. */
3174 linux_resume_one_lwp (struct lwp_info
*lwp
,
3175 int step
, int signal
, siginfo_t
*info
)
3177 struct thread_info
*saved_inferior
;
3178 int fast_tp_collecting
;
3180 if (lwp
->stopped
== 0)
3183 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3185 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3187 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3188 user used the "jump" command, or "set $pc = foo"). */
3189 if (lwp
->stop_pc
!= get_pc (lwp
))
3191 /* Collecting 'while-stepping' actions doesn't make sense
3193 release_while_stepping_state_list (get_lwp_thread (lwp
));
3196 /* If we have pending signals or status, and a new signal, enqueue the
3197 signal. Also enqueue the signal if we are waiting to reinsert a
3198 breakpoint; it will be picked up again below. */
3200 && (lwp
->status_pending_p
3201 || lwp
->pending_signals
!= NULL
3202 || lwp
->bp_reinsert
!= 0
3203 || fast_tp_collecting
))
3205 struct pending_signals
*p_sig
;
3206 p_sig
= xmalloc (sizeof (*p_sig
));
3207 p_sig
->prev
= lwp
->pending_signals
;
3208 p_sig
->signal
= signal
;
3210 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3212 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3213 lwp
->pending_signals
= p_sig
;
3216 if (lwp
->status_pending_p
)
3219 fprintf (stderr
, "Not resuming lwp %ld (%s, signal %d, stop %s);"
3220 " has pending status\n",
3221 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3222 lwp
->stop_expected
? "expected" : "not expected");
3226 saved_inferior
= current_inferior
;
3227 current_inferior
= get_lwp_thread (lwp
);
3230 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
3231 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3232 lwp
->stop_expected
? "expected" : "not expected");
3234 /* This bit needs some thinking about. If we get a signal that
3235 we must report while a single-step reinsert is still pending,
3236 we often end up resuming the thread. It might be better to
3237 (ew) allow a stack of pending events; then we could be sure that
3238 the reinsert happened right away and not lose any signals.
3240 Making this stack would also shrink the window in which breakpoints are
3241 uninserted (see comment in linux_wait_for_lwp) but not enough for
3242 complete correctness, so it won't solve that problem. It may be
3243 worthwhile just to solve this one, however. */
3244 if (lwp
->bp_reinsert
!= 0)
3247 fprintf (stderr
, " pending reinsert at 0x%s\n",
3248 paddress (lwp
->bp_reinsert
));
3250 if (can_hardware_single_step ())
3252 if (fast_tp_collecting
== 0)
3255 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3257 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3264 /* Postpone any pending signal. It was enqueued above. */
3268 if (fast_tp_collecting
== 1)
3272 lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n",
3275 /* Postpone any pending signal. It was enqueued above. */
3278 else if (fast_tp_collecting
== 2)
3282 lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n",
3285 if (can_hardware_single_step ())
3288 fatal ("moving out of jump pad single-stepping"
3289 " not implemented on this target");
3291 /* Postpone any pending signal. It was enqueued above. */
3295 /* If we have while-stepping actions in this thread set it stepping.
3296 If we have a signal to deliver, it may or may not be set to
3297 SIG_IGN, we don't know. Assume so, and allow collecting
3298 while-stepping into a signal handler. A possible smart thing to
3299 do would be to set an internal breakpoint at the signal return
3300 address, continue, and carry on catching this while-stepping
3301 action only when that breakpoint is hit. A future
3303 if (get_lwp_thread (lwp
)->while_stepping
!= NULL
3304 && can_hardware_single_step ())
3308 "lwp %ld has a while-stepping action -> forcing step.\n",
3313 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3315 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3316 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3317 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
3320 /* If we have pending signals, consume one unless we are trying to
3321 reinsert a breakpoint or we're trying to finish a fast tracepoint
3323 if (lwp
->pending_signals
!= NULL
3324 && lwp
->bp_reinsert
== 0
3325 && fast_tp_collecting
== 0)
3327 struct pending_signals
**p_sig
;
3329 p_sig
= &lwp
->pending_signals
;
3330 while ((*p_sig
)->prev
!= NULL
)
3331 p_sig
= &(*p_sig
)->prev
;
3333 signal
= (*p_sig
)->signal
;
3334 if ((*p_sig
)->info
.si_signo
!= 0)
3335 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
3342 if (the_low_target
.prepare_to_resume
!= NULL
)
3343 the_low_target
.prepare_to_resume (lwp
);
3345 regcache_invalidate_thread (get_lwp_thread (lwp
));
3348 lwp
->stopped_by_watchpoint
= 0;
3349 lwp
->stepping
= step
;
3350 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
),
3351 (PTRACE_TYPE_ARG3
) 0,
3352 /* Coerce to a uintptr_t first to avoid potential gcc warning
3353 of coercing an 8 byte integer to a 4 byte pointer. */
3354 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3356 current_inferior
= saved_inferior
;
3359 /* ESRCH from ptrace either means that the thread was already
3360 running (an error) or that it is gone (a race condition). If
3361 it's gone, we will get a notification the next time we wait,
3362 so we can ignore the error. We could differentiate these
3363 two, but it's tricky without waiting; the thread still exists
3364 as a zombie, so sending it signal 0 would succeed. So just
3369 perror_with_name ("ptrace");
3373 struct thread_resume_array
3375 struct thread_resume
*resume
;
3379 /* This function is called once per thread. We look up the thread
3380 in RESUME_PTR, and mark the thread with a pointer to the appropriate
3383 This algorithm is O(threads * resume elements), but resume elements
3384 is small (and will remain small at least until GDB supports thread
3387 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3389 struct lwp_info
*lwp
;
3390 struct thread_info
*thread
;
3392 struct thread_resume_array
*r
;
3394 thread
= (struct thread_info
*) entry
;
3395 lwp
= get_thread_lwp (thread
);
3398 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3400 ptid_t ptid
= r
->resume
[ndx
].thread
;
3401 if (ptid_equal (ptid
, minus_one_ptid
)
3402 || ptid_equal (ptid
, entry
->id
)
3403 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3405 || (ptid_get_pid (ptid
) == pid_of (lwp
)
3406 && (ptid_is_pid (ptid
)
3407 || ptid_get_lwp (ptid
) == -1)))
3409 if (r
->resume
[ndx
].kind
== resume_stop
3410 && thread
->last_resume_kind
== resume_stop
)
3413 fprintf (stderr
, "already %s LWP %ld at GDB's request\n",
3414 thread
->last_status
.kind
== TARGET_WAITKIND_STOPPED
3422 lwp
->resume
= &r
->resume
[ndx
];
3423 thread
->last_resume_kind
= lwp
->resume
->kind
;
3425 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3426 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3428 /* If we had a deferred signal to report, dequeue one now.
3429 This can happen if LWP gets more than one signal while
3430 trying to get out of a jump pad. */
3432 && !lwp
->status_pending_p
3433 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3435 lwp
->status_pending_p
= 1;
3439 "Dequeueing deferred signal %d for LWP %ld, "
3440 "leaving status pending.\n",
3441 WSTOPSIG (lwp
->status_pending
), lwpid_of (lwp
));
3448 /* No resume action for this thread. */
3455 /* Set *FLAG_P if this lwp has an interesting status pending. */
3457 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3459 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3461 /* LWPs which will not be resumed are not interesting, because
3462 we might not wait for them next time through linux_wait. */
3463 if (lwp
->resume
== NULL
)
3466 if (lwp
->status_pending_p
)
3467 * (int *) flag_p
= 1;
3472 /* Return 1 if this lwp that GDB wants running is stopped at an
3473 internal breakpoint that we need to step over. It assumes that any
3474 required STOP_PC adjustment has already been propagated to the
3475 inferior's regcache. */
3478 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3480 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3481 struct thread_info
*thread
;
3482 struct thread_info
*saved_inferior
;
3485 /* LWPs which will not be resumed are not interesting, because we
3486 might not wait for them next time through linux_wait. */
3492 "Need step over [LWP %ld]? Ignoring, not stopped\n",
3497 thread
= get_lwp_thread (lwp
);
3499 if (thread
->last_resume_kind
== resume_stop
)
3503 "Need step over [LWP %ld]? Ignoring, should remain stopped\n",
3508 gdb_assert (lwp
->suspended
>= 0);
3514 "Need step over [LWP %ld]? Ignoring, suspended\n",
3519 if (!lwp
->need_step_over
)
3523 "Need step over [LWP %ld]? No\n", lwpid_of (lwp
));
3526 if (lwp
->status_pending_p
)
3530 "Need step over [LWP %ld]? Ignoring, has pending status.\n",
3535 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3539 /* If the PC has changed since we stopped, then don't do anything,
3540 and let the breakpoint/tracepoint be hit. This happens if, for
3541 instance, GDB handled the decr_pc_after_break subtraction itself,
3542 GDB is OOL stepping this thread, or the user has issued a "jump"
3543 command, or poked thread's registers herself. */
3544 if (pc
!= lwp
->stop_pc
)
3548 "Need step over [LWP %ld]? Cancelling, PC was changed. "
3549 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3550 lwpid_of (lwp
), paddress (lwp
->stop_pc
), paddress (pc
));
3552 lwp
->need_step_over
= 0;
3556 saved_inferior
= current_inferior
;
3557 current_inferior
= thread
;
3559 /* We can only step over breakpoints we know about. */
3560 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3562 /* Don't step over a breakpoint that GDB expects to hit
3563 though. If the condition is being evaluated on the target's side
3564 and it evaluate to false, step over this breakpoint as well. */
3565 if (gdb_breakpoint_here (pc
)
3566 && gdb_condition_true_at_breakpoint (pc
)
3567 && gdb_no_commands_at_breakpoint (pc
))
3571 "Need step over [LWP %ld]? yes, but found"
3572 " GDB breakpoint at 0x%s; skipping step over\n",
3573 lwpid_of (lwp
), paddress (pc
));
3575 current_inferior
= saved_inferior
;
3582 "Need step over [LWP %ld]? yes, "
3583 "found breakpoint at 0x%s\n",
3584 lwpid_of (lwp
), paddress (pc
));
3586 /* We've found an lwp that needs stepping over --- return 1 so
3587 that find_inferior stops looking. */
3588 current_inferior
= saved_inferior
;
3590 /* If the step over is cancelled, this is set again. */
3591 lwp
->need_step_over
= 0;
3596 current_inferior
= saved_inferior
;
3600 "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n",
3601 lwpid_of (lwp
), paddress (pc
));
3606 /* Start a step-over operation on LWP. When LWP stopped at a
3607 breakpoint, to make progress, we need to remove the breakpoint out
3608 of the way. If we let other threads run while we do that, they may
3609 pass by the breakpoint location and miss hitting it. To avoid
3610 that, a step-over momentarily stops all threads while LWP is
3611 single-stepped while the breakpoint is temporarily uninserted from
3612 the inferior. When the single-step finishes, we reinsert the
3613 breakpoint, and let all threads that are supposed to be running,
3616 On targets that don't support hardware single-step, we don't
3617 currently support full software single-stepping. Instead, we only
3618 support stepping over the thread event breakpoint, by asking the
3619 low target where to place a reinsert breakpoint. Since this
3620 routine assumes the breakpoint being stepped over is a thread event
3621 breakpoint, it usually assumes the return address of the current
3622 function is a good enough place to set the reinsert breakpoint. */
3625 start_step_over (struct lwp_info
*lwp
)
3627 struct thread_info
*saved_inferior
;
3633 "Starting step-over on LWP %ld. Stopping all threads\n",
3636 stop_all_lwps (1, lwp
);
3637 gdb_assert (lwp
->suspended
== 0);
3640 fprintf (stderr
, "Done stopping all threads for step-over.\n");
3642 /* Note, we should always reach here with an already adjusted PC,
3643 either by GDB (if we're resuming due to GDB's request), or by our
3644 caller, if we just finished handling an internal breakpoint GDB
3645 shouldn't care about. */
3648 saved_inferior
= current_inferior
;
3649 current_inferior
= get_lwp_thread (lwp
);
3651 lwp
->bp_reinsert
= pc
;
3652 uninsert_breakpoints_at (pc
);
3653 uninsert_fast_tracepoint_jumps_at (pc
);
3655 if (can_hardware_single_step ())
3661 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3662 set_reinsert_breakpoint (raddr
);
3666 current_inferior
= saved_inferior
;
3668 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3670 /* Require next event from this LWP. */
3671 step_over_bkpt
= lwp
->head
.id
;
3675 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3676 start_step_over, if still there, and delete any reinsert
3677 breakpoints we've set, on non hardware single-step targets. */
3680 finish_step_over (struct lwp_info
*lwp
)
3682 if (lwp
->bp_reinsert
!= 0)
3685 fprintf (stderr
, "Finished step over.\n");
3687 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3688 may be no breakpoint to reinsert there by now. */
3689 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3690 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3692 lwp
->bp_reinsert
= 0;
3694 /* Delete any software-single-step reinsert breakpoints. No
3695 longer needed. We don't have to worry about other threads
3696 hitting this trap, and later not being able to explain it,
3697 because we were stepping over a breakpoint, and we hold all
3698 threads but LWP stopped while doing that. */
3699 if (!can_hardware_single_step ())
3700 delete_reinsert_breakpoints ();
3702 step_over_bkpt
= null_ptid
;
3709 /* This function is called once per thread. We check the thread's resume
3710 request, which will tell us whether to resume, step, or leave the thread
3711 stopped; and what signal, if any, it should be sent.
3713 For threads which we aren't explicitly told otherwise, we preserve
3714 the stepping flag; this is used for stepping over gdbserver-placed
3717 If pending_flags was set in any thread, we queue any needed
3718 signals, since we won't actually resume. We already have a pending
3719 event to report, so we don't need to preserve any step requests;
3720 they should be re-issued if necessary. */
3723 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3725 struct lwp_info
*lwp
;
3726 struct thread_info
*thread
;
3728 int leave_all_stopped
= * (int *) arg
;
3731 thread
= (struct thread_info
*) entry
;
3732 lwp
= get_thread_lwp (thread
);
3734 if (lwp
->resume
== NULL
)
3737 if (lwp
->resume
->kind
== resume_stop
)
3740 fprintf (stderr
, "resume_stop request for LWP %ld\n", lwpid_of (lwp
));
3745 fprintf (stderr
, "stopping LWP %ld\n", lwpid_of (lwp
));
3747 /* Stop the thread, and wait for the event asynchronously,
3748 through the event loop. */
3754 fprintf (stderr
, "already stopped LWP %ld\n",
3757 /* The LWP may have been stopped in an internal event that
3758 was not meant to be notified back to GDB (e.g., gdbserver
3759 breakpoint), so we should be reporting a stop event in
3762 /* If the thread already has a pending SIGSTOP, this is a
3763 no-op. Otherwise, something later will presumably resume
3764 the thread and this will cause it to cancel any pending
3765 operation, due to last_resume_kind == resume_stop. If
3766 the thread already has a pending status to report, we
3767 will still report it the next time we wait - see
3768 status_pending_p_callback. */
3770 /* If we already have a pending signal to report, then
3771 there's no need to queue a SIGSTOP, as this means we're
3772 midway through moving the LWP out of the jumppad, and we
3773 will report the pending signal as soon as that is
3775 if (lwp
->pending_signals_to_report
== NULL
)
3779 /* For stop requests, we're done. */
3781 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3785 /* If this thread which is about to be resumed has a pending status,
3786 then don't resume any threads - we can just report the pending
3787 status. Make sure to queue any signals that would otherwise be
3788 sent. In all-stop mode, we do this decision based on if *any*
3789 thread has a pending status. If there's a thread that needs the
3790 step-over-breakpoint dance, then don't resume any other thread
3791 but that particular one. */
3792 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3797 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
3799 step
= (lwp
->resume
->kind
== resume_step
);
3800 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3805 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
3807 /* If we have a new signal, enqueue the signal. */
3808 if (lwp
->resume
->sig
!= 0)
3810 struct pending_signals
*p_sig
;
3811 p_sig
= xmalloc (sizeof (*p_sig
));
3812 p_sig
->prev
= lwp
->pending_signals
;
3813 p_sig
->signal
= lwp
->resume
->sig
;
3814 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3816 /* If this is the same signal we were previously stopped by,
3817 make sure to queue its siginfo. We can ignore the return
3818 value of ptrace; if it fails, we'll skip
3819 PTRACE_SETSIGINFO. */
3820 if (WIFSTOPPED (lwp
->last_status
)
3821 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3822 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_TYPE_ARG3
) 0,
3825 lwp
->pending_signals
= p_sig
;
3829 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3835 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3837 struct thread_resume_array array
= { resume_info
, n
};
3838 struct lwp_info
*need_step_over
= NULL
;
3840 int leave_all_stopped
;
3842 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3844 /* If there is a thread which would otherwise be resumed, which has
3845 a pending status, then don't resume any threads - we can just
3846 report the pending status. Make sure to queue any signals that
3847 would otherwise be sent. In non-stop mode, we'll apply this
3848 logic to each thread individually. We consume all pending events
3849 before considering to start a step-over (in all-stop). */
3852 find_inferior (&all_lwps
, resume_status_pending_p
, &any_pending
);
3854 /* If there is a thread which would otherwise be resumed, which is
3855 stopped at a breakpoint that needs stepping over, then don't
3856 resume any threads - have it step over the breakpoint with all
3857 other threads stopped, then resume all threads again. Make sure
3858 to queue any signals that would otherwise be delivered or
3860 if (!any_pending
&& supports_breakpoints ())
3862 = (struct lwp_info
*) find_inferior (&all_lwps
,
3863 need_step_over_p
, NULL
);
3865 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3869 if (need_step_over
!= NULL
)
3870 fprintf (stderr
, "Not resuming all, need step over\n");
3871 else if (any_pending
)
3873 "Not resuming, all-stop and found "
3874 "an LWP with pending status\n");
3876 fprintf (stderr
, "Resuming, no pending status or step over needed\n");
3879 /* Even if we're leaving threads stopped, queue all signals we'd
3880 otherwise deliver. */
3881 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
3884 start_step_over (need_step_over
);
3887 /* This function is called once per thread. We check the thread's
3888 last resume request, which will tell us whether to resume, step, or
3889 leave the thread stopped. Any signal the client requested to be
3890 delivered has already been enqueued at this point.
3892 If any thread that GDB wants running is stopped at an internal
3893 breakpoint that needs stepping over, we start a step-over operation
3894 on that particular thread, and leave all others stopped. */
3897 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3899 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3900 struct thread_info
*thread
;
3908 "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp
));
3913 fprintf (stderr
, " LWP %ld already running\n", lwpid_of (lwp
));
3917 thread
= get_lwp_thread (lwp
);
3919 if (thread
->last_resume_kind
== resume_stop
3920 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
3923 fprintf (stderr
, " client wants LWP to remain %ld stopped\n",
3928 if (lwp
->status_pending_p
)
3931 fprintf (stderr
, " LWP %ld has pending status, leaving stopped\n",
3936 gdb_assert (lwp
->suspended
>= 0);
3941 fprintf (stderr
, " LWP %ld is suspended\n", lwpid_of (lwp
));
3945 if (thread
->last_resume_kind
== resume_stop
3946 && lwp
->pending_signals_to_report
== NULL
3947 && lwp
->collecting_fast_tracepoint
== 0)
3949 /* We haven't reported this LWP as stopped yet (otherwise, the
3950 last_status.kind check above would catch it, and we wouldn't
3951 reach here. This LWP may have been momentarily paused by a
3952 stop_all_lwps call while handling for example, another LWP's
3953 step-over. In that case, the pending expected SIGSTOP signal
3954 that was queued at vCont;t handling time will have already
3955 been consumed by wait_for_sigstop, and so we need to requeue
3956 another one here. Note that if the LWP already has a SIGSTOP
3957 pending, this is a no-op. */
3961 "Client wants LWP %ld to stop. "
3962 "Making sure it has a SIGSTOP pending\n",
3968 step
= thread
->last_resume_kind
== resume_step
;
3969 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3974 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3976 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3982 gdb_assert (lwp
->suspended
>= 0);
3984 return proceed_one_lwp (entry
, except
);
3987 /* When we finish a step-over, set threads running again. If there's
3988 another thread that may need a step-over, now's the time to start
3989 it. Eventually, we'll move all threads past their breakpoints. */
3992 proceed_all_lwps (void)
3994 struct lwp_info
*need_step_over
;
3996 /* If there is a thread which would otherwise be resumed, which is
3997 stopped at a breakpoint that needs stepping over, then don't
3998 resume any threads - have it step over the breakpoint with all
3999 other threads stopped, then resume all threads again. */
4001 if (supports_breakpoints ())
4004 = (struct lwp_info
*) find_inferior (&all_lwps
,
4005 need_step_over_p
, NULL
);
4007 if (need_step_over
!= NULL
)
4010 fprintf (stderr
, "proceed_all_lwps: found "
4011 "thread %ld needing a step-over\n",
4012 lwpid_of (need_step_over
));
4014 start_step_over (need_step_over
);
4020 fprintf (stderr
, "Proceeding, no step-over needed\n");
4022 find_inferior (&all_lwps
, proceed_one_lwp
, NULL
);
4025 /* Stopped LWPs that the client wanted to be running, that don't have
4026 pending statuses, are set to run again, except for EXCEPT, if not
4027 NULL. This undoes a stop_all_lwps call. */
4030 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4036 "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except
));
4039 "unstopping all lwps\n");
4043 find_inferior (&all_lwps
, unsuspend_and_proceed_one_lwp
, except
);
4045 find_inferior (&all_lwps
, proceed_one_lwp
, except
);
4049 #ifdef HAVE_LINUX_REGSETS
4051 #define use_linux_regsets 1
4053 /* Returns true if REGSET has been disabled. */
4056 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4058 return (info
->disabled_regsets
!= NULL
4059 && info
->disabled_regsets
[regset
- info
->regsets
]);
4062 /* Disable REGSET. */
4065 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4069 dr_offset
= regset
- info
->regsets
;
4070 if (info
->disabled_regsets
== NULL
)
4071 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4072 info
->disabled_regsets
[dr_offset
] = 1;
4076 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4077 struct regcache
*regcache
)
4079 struct regset_info
*regset
;
4080 int saw_general_regs
= 0;
4084 regset
= regsets_info
->regsets
;
4086 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4087 while (regset
->size
>= 0)
4092 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4098 buf
= xmalloc (regset
->size
);
4100 nt_type
= regset
->nt_type
;
4104 iov
.iov_len
= regset
->size
;
4105 data
= (void *) &iov
;
4111 res
= ptrace (regset
->get_request
, pid
,
4112 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4114 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4120 /* If we get EIO on a regset, do not try it again for
4121 this process mode. */
4122 disable_regset (regsets_info
, regset
);
4129 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4134 else if (regset
->type
== GENERAL_REGS
)
4135 saw_general_regs
= 1;
4136 regset
->store_function (regcache
, buf
);
4140 if (saw_general_regs
)
4147 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4148 struct regcache
*regcache
)
4150 struct regset_info
*regset
;
4151 int saw_general_regs
= 0;
4155 regset
= regsets_info
->regsets
;
4157 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4158 while (regset
->size
>= 0)
4163 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4169 buf
= xmalloc (regset
->size
);
4171 /* First fill the buffer with the current register set contents,
4172 in case there are any items in the kernel's regset that are
4173 not in gdbserver's regcache. */
4175 nt_type
= regset
->nt_type
;
4179 iov
.iov_len
= regset
->size
;
4180 data
= (void *) &iov
;
4186 res
= ptrace (regset
->get_request
, pid
,
4187 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4189 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4194 /* Then overlay our cached registers on that. */
4195 regset
->fill_function (regcache
, buf
);
4197 /* Only now do we write the register set. */
4199 res
= ptrace (regset
->set_request
, pid
,
4200 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4202 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4210 /* If we get EIO on a regset, do not try it again for
4211 this process mode. */
4212 disable_regset (regsets_info
, regset
);
4216 else if (errno
== ESRCH
)
4218 /* At this point, ESRCH should mean the process is
4219 already gone, in which case we simply ignore attempts
4220 to change its registers. See also the related
4221 comment in linux_resume_one_lwp. */
4227 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4230 else if (regset
->type
== GENERAL_REGS
)
4231 saw_general_regs
= 1;
4235 if (saw_general_regs
)
4241 #else /* !HAVE_LINUX_REGSETS */
4243 #define use_linux_regsets 0
4244 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4245 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4249 /* Return 1 if register REGNO is supported by one of the regset ptrace
4250 calls or 0 if it has to be transferred individually. */
4253 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4255 unsigned char mask
= 1 << (regno
% 8);
4256 size_t index
= regno
/ 8;
4258 return (use_linux_regsets
4259 && (regs_info
->regset_bitmap
== NULL
4260 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4263 #ifdef HAVE_LINUX_USRREGS
4266 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4270 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4271 error ("Invalid register number %d.", regnum
);
4273 addr
= usrregs
->regmap
[regnum
];
4278 /* Fetch one register. */
4280 fetch_register (const struct usrregs_info
*usrregs
,
4281 struct regcache
*regcache
, int regno
)
4288 if (regno
>= usrregs
->num_regs
)
4290 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4293 regaddr
= register_addr (usrregs
, regno
);
4297 size
= ((register_size (regcache
->tdesc
, regno
)
4298 + sizeof (PTRACE_XFER_TYPE
) - 1)
4299 & -sizeof (PTRACE_XFER_TYPE
));
4300 buf
= alloca (size
);
4302 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4303 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4306 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4307 ptrace (PTRACE_PEEKUSER
, pid
,
4308 /* Coerce to a uintptr_t first to avoid potential gcc warning
4309 of coercing an 8 byte integer to a 4 byte pointer. */
4310 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4311 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4313 error ("reading register %d: %s", regno
, strerror (errno
));
4316 if (the_low_target
.supply_ptrace_register
)
4317 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4319 supply_register (regcache
, regno
, buf
);
4322 /* Store one register. */
4324 store_register (const struct usrregs_info
*usrregs
,
4325 struct regcache
*regcache
, int regno
)
4332 if (regno
>= usrregs
->num_regs
)
4334 if ((*the_low_target
.cannot_store_register
) (regno
))
4337 regaddr
= register_addr (usrregs
, regno
);
4341 size
= ((register_size (regcache
->tdesc
, regno
)
4342 + sizeof (PTRACE_XFER_TYPE
) - 1)
4343 & -sizeof (PTRACE_XFER_TYPE
));
4344 buf
= alloca (size
);
4345 memset (buf
, 0, size
);
4347 if (the_low_target
.collect_ptrace_register
)
4348 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4350 collect_register (regcache
, regno
, buf
);
4352 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4353 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4356 ptrace (PTRACE_POKEUSER
, pid
,
4357 /* Coerce to a uintptr_t first to avoid potential gcc warning
4358 about coercing an 8 byte integer to a 4 byte pointer. */
4359 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4360 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4363 /* At this point, ESRCH should mean the process is
4364 already gone, in which case we simply ignore attempts
4365 to change its registers. See also the related
4366 comment in linux_resume_one_lwp. */
4370 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4371 error ("writing register %d: %s", regno
, strerror (errno
));
4373 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4377 /* Fetch all registers, or just one, from the child process.
4378 If REGNO is -1, do this for all registers, skipping any that are
4379 assumed to have been retrieved by regsets_fetch_inferior_registers,
4380 unless ALL is non-zero.
4381 Otherwise, REGNO specifies which register (so we can save time). */
4383 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4384 struct regcache
*regcache
, int regno
, int all
)
4386 struct usrregs_info
*usr
= regs_info
->usrregs
;
4390 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4391 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4392 fetch_register (usr
, regcache
, regno
);
4395 fetch_register (usr
, regcache
, regno
);
4398 /* Store our register values back into the inferior.
4399 If REGNO is -1, do this for all registers, skipping any that are
4400 assumed to have been saved by regsets_store_inferior_registers,
4401 unless ALL is non-zero.
4402 Otherwise, REGNO specifies which register (so we can save time). */
4404 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4405 struct regcache
*regcache
, int regno
, int all
)
4407 struct usrregs_info
*usr
= regs_info
->usrregs
;
4411 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4412 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4413 store_register (usr
, regcache
, regno
);
4416 store_register (usr
, regcache
, regno
);
4419 #else /* !HAVE_LINUX_USRREGS */
4421 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4422 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4428 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4432 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4436 if (the_low_target
.fetch_register
!= NULL
4437 && regs_info
->usrregs
!= NULL
)
4438 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4439 (*the_low_target
.fetch_register
) (regcache
, regno
);
4441 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4442 if (regs_info
->usrregs
!= NULL
)
4443 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
4447 if (the_low_target
.fetch_register
!= NULL
4448 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4451 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4453 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
4455 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4456 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
4461 linux_store_registers (struct regcache
*regcache
, int regno
)
4465 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4469 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4471 if (regs_info
->usrregs
!= NULL
)
4472 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
4476 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
4478 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
4480 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
4481 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
4486 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4487 to debugger memory starting at MYADDR. */
4490 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4492 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4493 register PTRACE_XFER_TYPE
*buffer
;
4494 register CORE_ADDR addr
;
4501 /* Try using /proc. Don't bother for one word. */
4502 if (len
>= 3 * sizeof (long))
4506 /* We could keep this file open and cache it - possibly one per
4507 thread. That requires some juggling, but is even faster. */
4508 sprintf (filename
, "/proc/%d/mem", pid
);
4509 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4513 /* If pread64 is available, use it. It's faster if the kernel
4514 supports it (only one syscall), and it's 64-bit safe even on
4515 32-bit platforms (for instance, SPARC debugging a SPARC64
4518 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4521 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4522 bytes
= read (fd
, myaddr
, len
);
4529 /* Some data was read, we'll try to get the rest with ptrace. */
4539 /* Round starting address down to longword boundary. */
4540 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4541 /* Round ending address up; get number of longwords that makes. */
4542 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4543 / sizeof (PTRACE_XFER_TYPE
));
4544 /* Allocate buffer of that many longwords. */
4545 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4547 /* Read all the longwords */
4549 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4551 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4552 about coercing an 8 byte integer to a 4 byte pointer. */
4553 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4554 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4555 (PTRACE_TYPE_ARG4
) 0);
4561 /* Copy appropriate bytes out of the buffer. */
4564 i
*= sizeof (PTRACE_XFER_TYPE
);
4565 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4567 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4574 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4575 memory at MEMADDR. On failure (cannot write to the inferior)
4576 returns the value of errno. Always succeeds if LEN is zero. */
4579 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4582 /* Round starting address down to longword boundary. */
4583 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4584 /* Round ending address up; get number of longwords that makes. */
4586 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4587 / sizeof (PTRACE_XFER_TYPE
);
4589 /* Allocate buffer of that many longwords. */
4590 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4591 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4593 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4597 /* Zero length write always succeeds. */
4603 /* Dump up to four bytes. */
4604 unsigned int val
= * (unsigned int *) myaddr
;
4610 val
= val
& 0xffffff;
4611 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4612 val
, (long)memaddr
);
4615 /* Fill start and end extra bytes of buffer with existing memory data. */
4618 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4619 about coercing an 8 byte integer to a 4 byte pointer. */
4620 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4621 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4622 (PTRACE_TYPE_ARG4
) 0);
4630 = ptrace (PTRACE_PEEKTEXT
, pid
,
4631 /* Coerce to a uintptr_t first to avoid potential gcc warning
4632 about coercing an 8 byte integer to a 4 byte pointer. */
4633 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
4634 * sizeof (PTRACE_XFER_TYPE
)),
4635 (PTRACE_TYPE_ARG4
) 0);
4640 /* Copy data to be written over corresponding part of buffer. */
4642 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4645 /* Write the entire buffer. */
4647 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4650 ptrace (PTRACE_POKETEXT
, pid
,
4651 /* Coerce to a uintptr_t first to avoid potential gcc warning
4652 about coercing an 8 byte integer to a 4 byte pointer. */
4653 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
4654 (PTRACE_TYPE_ARG4
) buffer
[i
]);
4662 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
4663 static int linux_supports_tracefork_flag
;
4666 linux_enable_event_reporting (int pid
)
4668 if (!linux_supports_tracefork_flag
)
4671 ptrace (PTRACE_SETOPTIONS
, pid
, (PTRACE_TYPE_ARG3
) 0,
4672 (PTRACE_TYPE_ARG4
) PTRACE_O_TRACECLONE
);
4675 /* Helper functions for linux_test_for_tracefork, called via clone (). */
4678 linux_tracefork_grandchild (void *arg
)
4683 #define STACK_SIZE 4096
4686 linux_tracefork_child (void *arg
)
4688 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
4689 kill (getpid (), SIGSTOP
);
4691 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4694 linux_tracefork_grandchild (NULL
);
4696 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4699 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
4700 CLONE_VM
| SIGCHLD
, NULL
);
4702 clone (linux_tracefork_grandchild
, (char *) arg
+ STACK_SIZE
,
4703 CLONE_VM
| SIGCHLD
, NULL
);
4706 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4711 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
4712 sure that we can enable the option, and that it had the desired
4716 linux_test_for_tracefork (void)
4718 int child_pid
, ret
, status
;
4720 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4721 char *stack
= xmalloc (STACK_SIZE
* 4);
4722 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4724 linux_supports_tracefork_flag
= 0;
4726 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4728 child_pid
= fork ();
4730 linux_tracefork_child (NULL
);
4732 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4734 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
4736 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
4737 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4738 #else /* !__ia64__ */
4739 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
4740 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4741 #endif /* !__ia64__ */
4743 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4745 if (child_pid
== -1)
4746 perror_with_name ("clone");
4748 ret
= my_waitpid (child_pid
, &status
, 0);
4750 perror_with_name ("waitpid");
4751 else if (ret
!= child_pid
)
4752 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
4753 if (! WIFSTOPPED (status
))
4754 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
4756 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, (PTRACE_TYPE_ARG3
) 0,
4757 (PTRACE_TYPE_ARG4
) PTRACE_O_TRACEFORK
);
4760 ret
= ptrace (PTRACE_KILL
, child_pid
, (PTRACE_TYPE_ARG3
) 0,
4761 (PTRACE_TYPE_ARG4
) 0);
4764 warning ("linux_test_for_tracefork: failed to kill child");
4768 ret
= my_waitpid (child_pid
, &status
, 0);
4769 if (ret
!= child_pid
)
4770 warning ("linux_test_for_tracefork: failed to wait for killed child");
4771 else if (!WIFSIGNALED (status
))
4772 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
4773 "killed child", status
);
4778 ret
= ptrace (PTRACE_CONT
, child_pid
, (PTRACE_TYPE_ARG3
) 0,
4779 (PTRACE_TYPE_ARG4
) 0);
4781 warning ("linux_test_for_tracefork: failed to resume child");
4783 ret
= my_waitpid (child_pid
, &status
, 0);
4785 if (ret
== child_pid
&& WIFSTOPPED (status
)
4786 && status
>> 16 == PTRACE_EVENT_FORK
)
4789 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, (PTRACE_TYPE_ARG3
) 0,
4791 if (ret
== 0 && second_pid
!= 0)
4795 linux_supports_tracefork_flag
= 1;
4796 my_waitpid (second_pid
, &second_status
, 0);
4797 ret
= ptrace (PTRACE_KILL
, second_pid
, (PTRACE_TYPE_ARG3
) 0,
4798 (PTRACE_TYPE_ARG4
) 0);
4800 warning ("linux_test_for_tracefork: failed to kill second child");
4801 my_waitpid (second_pid
, &status
, 0);
4805 warning ("linux_test_for_tracefork: unexpected result from waitpid "
4806 "(%d, status 0x%x)", ret
, status
);
4810 ret
= ptrace (PTRACE_KILL
, child_pid
, (PTRACE_TYPE_ARG3
) 0,
4811 (PTRACE_TYPE_ARG4
) 0);
4813 warning ("linux_test_for_tracefork: failed to kill child");
4814 my_waitpid (child_pid
, &status
, 0);
4816 while (WIFSTOPPED (status
));
4818 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4820 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4825 linux_look_up_symbols (void)
4827 #ifdef USE_THREAD_DB
4828 struct process_info
*proc
= current_process ();
4830 if (proc
->private->thread_db
!= NULL
)
4833 /* If the kernel supports tracing forks then it also supports tracing
4834 clones, and then we don't need to use the magic thread event breakpoint
4835 to learn about threads. */
4836 thread_db_init (!linux_supports_tracefork_flag
);
4841 linux_request_interrupt (void)
4843 extern unsigned long signal_pid
;
4845 if (!ptid_equal (cont_thread
, null_ptid
)
4846 && !ptid_equal (cont_thread
, minus_one_ptid
))
4848 struct lwp_info
*lwp
;
4851 lwp
= get_thread_lwp (current_inferior
);
4852 lwpid
= lwpid_of (lwp
);
4853 kill_lwp (lwpid
, SIGINT
);
4856 kill_lwp (signal_pid
, SIGINT
);
4859 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4860 to debugger memory starting at MYADDR. */
4863 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4865 char filename
[PATH_MAX
];
4867 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4869 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4871 fd
= open (filename
, O_RDONLY
);
4875 if (offset
!= (CORE_ADDR
) 0
4876 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4879 n
= read (fd
, myaddr
, len
);
4886 /* These breakpoint and watchpoint related wrapper functions simply
4887 pass on the function call if the target has registered a
4888 corresponding function. */
4891 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4893 if (the_low_target
.insert_point
!= NULL
)
4894 return the_low_target
.insert_point (type
, addr
, len
);
4896 /* Unsupported (see target.h). */
4901 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4903 if (the_low_target
.remove_point
!= NULL
)
4904 return the_low_target
.remove_point (type
, addr
, len
);
4906 /* Unsupported (see target.h). */
4911 linux_stopped_by_watchpoint (void)
4913 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4915 return lwp
->stopped_by_watchpoint
;
4919 linux_stopped_data_address (void)
4921 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4923 return lwp
->stopped_data_address
;
4926 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4927 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4928 && defined(PT_TEXT_END_ADDR)
4930 /* This is only used for targets that define PT_TEXT_ADDR,
4931 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4932 the target has different ways of acquiring this information, like
4935 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4936 to tell gdb about. */
4939 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4941 unsigned long text
, text_end
, data
;
4942 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4946 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
4947 (PTRACE_TYPE_ARG4
) 0);
4948 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
4949 (PTRACE_TYPE_ARG4
) 0);
4950 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
4951 (PTRACE_TYPE_ARG4
) 0);
4955 /* Both text and data offsets produced at compile-time (and so
4956 used by gdb) are relative to the beginning of the program,
4957 with the data segment immediately following the text segment.
4958 However, the actual runtime layout in memory may put the data
4959 somewhere else, so when we send gdb a data base-address, we
4960 use the real data base address and subtract the compile-time
4961 data base-address from it (which is just the length of the
4962 text segment). BSS immediately follows data in both
4965 *data_p
= data
- (text_end
- text
);
4974 linux_qxfer_osdata (const char *annex
,
4975 unsigned char *readbuf
, unsigned const char *writebuf
,
4976 CORE_ADDR offset
, int len
)
4978 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4981 /* Convert a native/host siginfo object, into/from the siginfo in the
4982 layout of the inferiors' architecture. */
4985 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4989 if (the_low_target
.siginfo_fixup
!= NULL
)
4990 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4992 /* If there was no callback, or the callback didn't do anything,
4993 then just do a straight memcpy. */
4997 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4999 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5004 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5005 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5009 char inf_siginfo
[sizeof (siginfo_t
)];
5011 if (current_inferior
== NULL
)
5014 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5017 fprintf (stderr
, "%s siginfo for lwp %d.\n",
5018 readbuf
!= NULL
? "Reading" : "Writing",
5021 if (offset
>= sizeof (siginfo
))
5024 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5027 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5028 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5029 inferior with a 64-bit GDBSERVER should look the same as debugging it
5030 with a 32-bit GDBSERVER, we need to convert it. */
5031 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5033 if (offset
+ len
> sizeof (siginfo
))
5034 len
= sizeof (siginfo
) - offset
;
5036 if (readbuf
!= NULL
)
5037 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5040 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5042 /* Convert back to ptrace layout before flushing it out. */
5043 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5045 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5052 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5053 so we notice when children change state; as the handler for the
5054 sigsuspend in my_waitpid. */
5057 sigchld_handler (int signo
)
5059 int old_errno
= errno
;
5065 /* fprintf is not async-signal-safe, so call write
5067 if (write (2, "sigchld_handler\n",
5068 sizeof ("sigchld_handler\n") - 1) < 0)
5069 break; /* just ignore */
5073 if (target_is_async_p ())
5074 async_file_mark (); /* trigger a linux_wait */
5080 linux_supports_non_stop (void)
5086 linux_async (int enable
)
5088 int previous
= (linux_event_pipe
[0] != -1);
5091 fprintf (stderr
, "linux_async (%d), previous=%d\n",
5094 if (previous
!= enable
)
5097 sigemptyset (&mask
);
5098 sigaddset (&mask
, SIGCHLD
);
5100 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5104 if (pipe (linux_event_pipe
) == -1)
5105 fatal ("creating event pipe failed.");
5107 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5108 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5110 /* Register the event loop handler. */
5111 add_file_handler (linux_event_pipe
[0],
5112 handle_target_event
, NULL
);
5114 /* Always trigger a linux_wait. */
5119 delete_file_handler (linux_event_pipe
[0]);
5121 close (linux_event_pipe
[0]);
5122 close (linux_event_pipe
[1]);
5123 linux_event_pipe
[0] = -1;
5124 linux_event_pipe
[1] = -1;
5127 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5134 linux_start_non_stop (int nonstop
)
5136 /* Register or unregister from event-loop accordingly. */
5137 linux_async (nonstop
);
5142 linux_supports_multi_process (void)
5148 linux_supports_disable_randomization (void)
5150 #ifdef HAVE_PERSONALITY
5158 linux_supports_agent (void)
5164 linux_supports_range_stepping (void)
5166 if (*the_low_target
.supports_range_stepping
== NULL
)
5169 return (*the_low_target
.supports_range_stepping
) ();
5172 /* Enumerate spufs IDs for process PID. */
5174 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5180 struct dirent
*entry
;
5182 sprintf (path
, "/proc/%ld/fd", pid
);
5183 dir
= opendir (path
);
5188 while ((entry
= readdir (dir
)) != NULL
)
5194 fd
= atoi (entry
->d_name
);
5198 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5199 if (stat (path
, &st
) != 0)
5201 if (!S_ISDIR (st
.st_mode
))
5204 if (statfs (path
, &stfs
) != 0)
5206 if (stfs
.f_type
!= SPUFS_MAGIC
)
5209 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5211 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5221 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5222 object type, using the /proc file system. */
5224 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5225 unsigned const char *writebuf
,
5226 CORE_ADDR offset
, int len
)
5228 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
5233 if (!writebuf
&& !readbuf
)
5241 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5244 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5245 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5250 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5257 ret
= write (fd
, writebuf
, (size_t) len
);
5259 ret
= read (fd
, readbuf
, (size_t) len
);
5265 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5266 struct target_loadseg
5268 /* Core address to which the segment is mapped. */
5270 /* VMA recorded in the program header. */
5272 /* Size of this segment in memory. */
5276 # if defined PT_GETDSBT
5277 struct target_loadmap
5279 /* Protocol version number, must be zero. */
5281 /* Pointer to the DSBT table, its size, and the DSBT index. */
5282 unsigned *dsbt_table
;
5283 unsigned dsbt_size
, dsbt_index
;
5284 /* Number of segments in this map. */
5286 /* The actual memory map. */
5287 struct target_loadseg segs
[/*nsegs*/];
5289 # define LINUX_LOADMAP PT_GETDSBT
5290 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5291 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5293 struct target_loadmap
5295 /* Protocol version number, must be zero. */
5297 /* Number of segments in this map. */
5299 /* The actual memory map. */
5300 struct target_loadseg segs
[/*nsegs*/];
5302 # define LINUX_LOADMAP PTRACE_GETFDPIC
5303 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5304 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5308 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5309 unsigned char *myaddr
, unsigned int len
)
5311 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
5313 struct target_loadmap
*data
= NULL
;
5314 unsigned int actual_length
, copy_length
;
5316 if (strcmp (annex
, "exec") == 0)
5317 addr
= (int) LINUX_LOADMAP_EXEC
;
5318 else if (strcmp (annex
, "interp") == 0)
5319 addr
= (int) LINUX_LOADMAP_INTERP
;
5323 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5329 actual_length
= sizeof (struct target_loadmap
)
5330 + sizeof (struct target_loadseg
) * data
->nsegs
;
5332 if (offset
< 0 || offset
> actual_length
)
5335 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5336 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5340 # define linux_read_loadmap NULL
5341 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5344 linux_process_qsupported (const char *query
)
5346 if (the_low_target
.process_qsupported
!= NULL
)
5347 the_low_target
.process_qsupported (query
);
5351 linux_supports_tracepoints (void)
5353 if (*the_low_target
.supports_tracepoints
== NULL
)
5356 return (*the_low_target
.supports_tracepoints
) ();
5360 linux_read_pc (struct regcache
*regcache
)
5362 if (the_low_target
.get_pc
== NULL
)
5365 return (*the_low_target
.get_pc
) (regcache
);
5369 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5371 gdb_assert (the_low_target
.set_pc
!= NULL
);
5373 (*the_low_target
.set_pc
) (regcache
, pc
);
5377 linux_thread_stopped (struct thread_info
*thread
)
5379 return get_thread_lwp (thread
)->stopped
;
5382 /* This exposes stop-all-threads functionality to other modules. */
5385 linux_pause_all (int freeze
)
5387 stop_all_lwps (freeze
, NULL
);
5390 /* This exposes unstop-all-threads functionality to other gdbserver
5394 linux_unpause_all (int unfreeze
)
5396 unstop_all_lwps (unfreeze
, NULL
);
5400 linux_prepare_to_access_memory (void)
5402 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5405 linux_pause_all (1);
5410 linux_done_accessing_memory (void)
5412 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5415 linux_unpause_all (1);
5419 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5420 CORE_ADDR collector
,
5423 CORE_ADDR
*jump_entry
,
5424 CORE_ADDR
*trampoline
,
5425 ULONGEST
*trampoline_size
,
5426 unsigned char *jjump_pad_insn
,
5427 ULONGEST
*jjump_pad_insn_size
,
5428 CORE_ADDR
*adjusted_insn_addr
,
5429 CORE_ADDR
*adjusted_insn_addr_end
,
5432 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5433 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5434 jump_entry
, trampoline
, trampoline_size
,
5435 jjump_pad_insn
, jjump_pad_insn_size
,
5436 adjusted_insn_addr
, adjusted_insn_addr_end
,
5440 static struct emit_ops
*
5441 linux_emit_ops (void)
5443 if (the_low_target
.emit_ops
!= NULL
)
5444 return (*the_low_target
.emit_ops
) ();
5450 linux_get_min_fast_tracepoint_insn_len (void)
5452 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5455 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5458 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5459 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5461 char filename
[PATH_MAX
];
5463 const int auxv_size
= is_elf64
5464 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5465 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5467 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5469 fd
= open (filename
, O_RDONLY
);
5475 while (read (fd
, buf
, auxv_size
) == auxv_size
5476 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5480 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5482 switch (aux
->a_type
)
5485 *phdr_memaddr
= aux
->a_un
.a_val
;
5488 *num_phdr
= aux
->a_un
.a_val
;
5494 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5496 switch (aux
->a_type
)
5499 *phdr_memaddr
= aux
->a_un
.a_val
;
5502 *num_phdr
= aux
->a_un
.a_val
;
5510 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5512 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5513 "phdr_memaddr = %ld, phdr_num = %d",
5514 (long) *phdr_memaddr
, *num_phdr
);
5521 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5524 get_dynamic (const int pid
, const int is_elf64
)
5526 CORE_ADDR phdr_memaddr
, relocation
;
5528 unsigned char *phdr_buf
;
5529 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5531 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5534 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5535 phdr_buf
= alloca (num_phdr
* phdr_size
);
5537 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5540 /* Compute relocation: it is expected to be 0 for "regular" executables,
5541 non-zero for PIE ones. */
5543 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5546 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5548 if (p
->p_type
== PT_PHDR
)
5549 relocation
= phdr_memaddr
- p
->p_vaddr
;
5553 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5555 if (p
->p_type
== PT_PHDR
)
5556 relocation
= phdr_memaddr
- p
->p_vaddr
;
5559 if (relocation
== -1)
5561 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5562 any real world executables, including PIE executables, have always
5563 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5564 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5565 or present DT_DEBUG anyway (fpc binaries are statically linked).
5567 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5569 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5574 for (i
= 0; i
< num_phdr
; i
++)
5578 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5580 if (p
->p_type
== PT_DYNAMIC
)
5581 return p
->p_vaddr
+ relocation
;
5585 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5587 if (p
->p_type
== PT_DYNAMIC
)
5588 return p
->p_vaddr
+ relocation
;
5595 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5596 can be 0 if the inferior does not yet have the library list initialized.
5597 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5598 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5601 get_r_debug (const int pid
, const int is_elf64
)
5603 CORE_ADDR dynamic_memaddr
;
5604 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5605 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5608 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5609 if (dynamic_memaddr
== 0)
5612 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5616 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5617 #ifdef DT_MIPS_RLD_MAP
5621 unsigned char buf
[sizeof (Elf64_Xword
)];
5625 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5627 if (linux_read_memory (dyn
->d_un
.d_val
,
5628 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5633 #endif /* DT_MIPS_RLD_MAP */
5635 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5636 map
= dyn
->d_un
.d_val
;
5638 if (dyn
->d_tag
== DT_NULL
)
5643 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5644 #ifdef DT_MIPS_RLD_MAP
5648 unsigned char buf
[sizeof (Elf32_Word
)];
5652 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5654 if (linux_read_memory (dyn
->d_un
.d_val
,
5655 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5660 #endif /* DT_MIPS_RLD_MAP */
5662 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5663 map
= dyn
->d_un
.d_val
;
5665 if (dyn
->d_tag
== DT_NULL
)
5669 dynamic_memaddr
+= dyn_size
;
5675 /* Read one pointer from MEMADDR in the inferior. */
5678 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5682 /* Go through a union so this works on either big or little endian
5683 hosts, when the inferior's pointer size is smaller than the size
5684 of CORE_ADDR. It is assumed the inferior's endianness is the
5685 same of the superior's. */
5688 CORE_ADDR core_addr
;
5693 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5696 if (ptr_size
== sizeof (CORE_ADDR
))
5697 *ptr
= addr
.core_addr
;
5698 else if (ptr_size
== sizeof (unsigned int))
5701 gdb_assert_not_reached ("unhandled pointer size");
5706 struct link_map_offsets
5708 /* Offset and size of r_debug.r_version. */
5709 int r_version_offset
;
5711 /* Offset and size of r_debug.r_map. */
5714 /* Offset to l_addr field in struct link_map. */
5717 /* Offset to l_name field in struct link_map. */
5720 /* Offset to l_ld field in struct link_map. */
5723 /* Offset to l_next field in struct link_map. */
5726 /* Offset to l_prev field in struct link_map. */
5730 /* Construct qXfer:libraries-svr4:read reply. */
5733 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5734 unsigned const char *writebuf
,
5735 CORE_ADDR offset
, int len
)
5738 unsigned document_len
;
5739 struct process_info_private
*const priv
= current_process ()->private;
5740 char filename
[PATH_MAX
];
5743 static const struct link_map_offsets lmo_32bit_offsets
=
5745 0, /* r_version offset. */
5746 4, /* r_debug.r_map offset. */
5747 0, /* l_addr offset in link_map. */
5748 4, /* l_name offset in link_map. */
5749 8, /* l_ld offset in link_map. */
5750 12, /* l_next offset in link_map. */
5751 16 /* l_prev offset in link_map. */
5754 static const struct link_map_offsets lmo_64bit_offsets
=
5756 0, /* r_version offset. */
5757 8, /* r_debug.r_map offset. */
5758 0, /* l_addr offset in link_map. */
5759 8, /* l_name offset in link_map. */
5760 16, /* l_ld offset in link_map. */
5761 24, /* l_next offset in link_map. */
5762 32 /* l_prev offset in link_map. */
5764 const struct link_map_offsets
*lmo
;
5765 unsigned int machine
;
5767 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
5768 int allocated
= 1024;
5770 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5771 int header_done
= 0;
5773 if (writebuf
!= NULL
)
5775 if (readbuf
== NULL
)
5778 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5779 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5780 is_elf64
= elf_64_file_p (filename
, &machine
);
5781 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5782 ptr_size
= is_elf64
? 8 : 4;
5784 while (annex
[0] != '\0')
5790 sep
= strchr (annex
, '=');
5795 if (len
== 5 && strncmp (annex
, "start", 5) == 0)
5797 else if (len
== 4 && strncmp (annex
, "prev", 4) == 0)
5801 annex
= strchr (sep
, ';');
5808 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
5815 if (priv
->r_debug
== 0)
5816 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5818 /* We failed to find DT_DEBUG. Such situation will not change
5819 for this inferior - do not retry it. Report it to GDB as
5820 E01, see for the reasons at the GDB solib-svr4.c side. */
5821 if (priv
->r_debug
== (CORE_ADDR
) -1)
5824 if (priv
->r_debug
!= 0)
5826 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5827 (unsigned char *) &r_version
,
5828 sizeof (r_version
)) != 0
5831 warning ("unexpected r_debug version %d", r_version
);
5833 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5834 &lm_addr
, ptr_size
) != 0)
5836 warning ("unable to read r_map from 0x%lx",
5837 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5842 document
= xmalloc (allocated
);
5843 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5844 p
= document
+ strlen (document
);
5847 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5848 &l_name
, ptr_size
) == 0
5849 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5850 &l_addr
, ptr_size
) == 0
5851 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5852 &l_ld
, ptr_size
) == 0
5853 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5854 &l_prev
, ptr_size
) == 0
5855 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5856 &l_next
, ptr_size
) == 0)
5858 unsigned char libname
[PATH_MAX
];
5860 if (lm_prev
!= l_prev
)
5862 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5863 (long) lm_prev
, (long) l_prev
);
5867 /* Ignore the first entry even if it has valid name as the first entry
5868 corresponds to the main executable. The first entry should not be
5869 skipped if the dynamic loader was loaded late by a static executable
5870 (see solib-svr4.c parameter ignore_first). But in such case the main
5871 executable does not have PT_DYNAMIC present and this function already
5872 exited above due to failed get_r_debug. */
5875 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5880 /* Not checking for error because reading may stop before
5881 we've got PATH_MAX worth of characters. */
5883 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5884 libname
[sizeof (libname
) - 1] = '\0';
5885 if (libname
[0] != '\0')
5887 /* 6x the size for xml_escape_text below. */
5888 size_t len
= 6 * strlen ((char *) libname
);
5893 /* Terminate `<library-list-svr4'. */
5898 while (allocated
< p
- document
+ len
+ 200)
5900 /* Expand to guarantee sufficient storage. */
5901 uintptr_t document_len
= p
- document
;
5903 document
= xrealloc (document
, 2 * allocated
);
5905 p
= document
+ document_len
;
5908 name
= xml_escape_text ((char *) libname
);
5909 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5910 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5911 name
, (unsigned long) lm_addr
,
5912 (unsigned long) l_addr
, (unsigned long) l_ld
);
5923 /* Empty list; terminate `<library-list-svr4'. */
5927 strcpy (p
, "</library-list-svr4>");
5929 document_len
= strlen (document
);
5930 if (offset
< document_len
)
5931 document_len
-= offset
;
5934 if (len
> document_len
)
5937 memcpy (readbuf
, document
+ offset
, len
);
5943 #ifdef HAVE_LINUX_BTRACE
5945 /* Enable branch tracing. */
5947 static struct btrace_target_info
*
5948 linux_low_enable_btrace (ptid_t ptid
)
5950 struct btrace_target_info
*tinfo
;
5952 tinfo
= linux_enable_btrace (ptid
);
5956 struct thread_info
*thread
= find_thread_ptid (ptid
);
5957 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
5959 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
5965 /* Read branch trace data as btrace xml document. */
5968 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5971 VEC (btrace_block_s
) *btrace
;
5972 struct btrace_block
*block
;
5975 btrace
= linux_read_btrace (tinfo
, type
);
5977 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5978 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5980 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5981 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5982 paddress (block
->begin
), paddress (block
->end
));
5984 buffer_grow_str (buffer
, "</btrace>\n");
5986 VEC_free (btrace_block_s
, btrace
);
5988 #endif /* HAVE_LINUX_BTRACE */
5990 static struct target_ops linux_target_ops
= {
5991 linux_create_inferior
,
6000 linux_fetch_registers
,
6001 linux_store_registers
,
6002 linux_prepare_to_access_memory
,
6003 linux_done_accessing_memory
,
6006 linux_look_up_symbols
,
6007 linux_request_interrupt
,
6011 linux_stopped_by_watchpoint
,
6012 linux_stopped_data_address
,
6013 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6014 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6015 && defined(PT_TEXT_END_ADDR)
6020 #ifdef USE_THREAD_DB
6021 thread_db_get_tls_address
,
6026 hostio_last_error_from_errno
,
6029 linux_supports_non_stop
,
6031 linux_start_non_stop
,
6032 linux_supports_multi_process
,
6033 #ifdef USE_THREAD_DB
6034 thread_db_handle_monitor_command
,
6038 linux_common_core_of_thread
,
6040 linux_process_qsupported
,
6041 linux_supports_tracepoints
,
6044 linux_thread_stopped
,
6048 linux_cancel_breakpoints
,
6049 linux_stabilize_threads
,
6050 linux_install_fast_tracepoint_jump_pad
,
6052 linux_supports_disable_randomization
,
6053 linux_get_min_fast_tracepoint_insn_len
,
6054 linux_qxfer_libraries_svr4
,
6055 linux_supports_agent
,
6056 #ifdef HAVE_LINUX_BTRACE
6057 linux_supports_btrace
,
6058 linux_low_enable_btrace
,
6059 linux_disable_btrace
,
6060 linux_low_read_btrace
,
6067 linux_supports_range_stepping
,
6071 linux_init_signals ()
6073 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6074 to find what the cancel signal actually is. */
6075 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6076 signal (__SIGRTMIN
+1, SIG_IGN
);
6080 #ifdef HAVE_LINUX_REGSETS
6082 initialize_regsets_info (struct regsets_info
*info
)
6084 for (info
->num_regsets
= 0;
6085 info
->regsets
[info
->num_regsets
].size
>= 0;
6086 info
->num_regsets
++)
6092 initialize_low (void)
6094 struct sigaction sigchld_action
;
6095 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6096 set_target_ops (&linux_target_ops
);
6097 set_breakpoint_data (the_low_target
.breakpoint
,
6098 the_low_target
.breakpoint_len
);
6099 linux_init_signals ();
6100 linux_test_for_tracefork ();
6101 linux_ptrace_init_warnings ();
6103 sigchld_action
.sa_handler
= sigchld_handler
;
6104 sigemptyset (&sigchld_action
.sa_mask
);
6105 sigchld_action
.sa_flags
= SA_RESTART
;
6106 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
6108 initialize_low_arch ();