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/param.h>
27 #include <sys/ptrace.h>
28 #include "linux-ptrace.h"
29 #include "linux-procfs.h"
31 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
47 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
48 then ELFMAG0 will have been defined. If it didn't get included by
49 gdb_proc_service.h then including it will likely introduce a duplicate
50 definition of elf_fpregset_t. */
55 #define SPUFS_MAGIC 0x23c9b64e
58 #ifdef HAVE_PERSONALITY
59 # include <sys/personality.h>
60 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
61 # define ADDR_NO_RANDOMIZE 0x0040000
70 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
73 /* This is the kernel's hard limit. Not to be confused with
80 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
81 /* PTRACE_TEXT_ADDR and friends. */
82 #include <asm/ptrace.h>
87 /* Some targets did not define these ptrace constants from the start,
88 so gdbserver defines them locally here. In the future, these may
89 be removed after they are added to asm/ptrace.h. */
90 #if !(defined(PT_TEXT_ADDR) \
91 || defined(PT_DATA_ADDR) \
92 || defined(PT_TEXT_END_ADDR))
93 #if defined(__mcoldfire__)
94 /* These are still undefined in 3.10 kernels. */
95 #define PT_TEXT_ADDR 49*4
96 #define PT_DATA_ADDR 50*4
97 #define PT_TEXT_END_ADDR 51*4
98 /* BFIN already defines these since at least 2.6.32 kernels. */
100 #define PT_TEXT_ADDR 220
101 #define PT_TEXT_END_ADDR 224
102 #define PT_DATA_ADDR 228
103 /* These are still undefined in 3.10 kernels. */
104 #elif defined(__TMS320C6X__)
105 #define PT_TEXT_ADDR (0x10000*4)
106 #define PT_DATA_ADDR (0x10004*4)
107 #define PT_TEXT_END_ADDR (0x10008*4)
111 #ifdef HAVE_LINUX_BTRACE
112 # include "linux-btrace.h"
115 #ifndef HAVE_ELF32_AUXV_T
116 /* Copied from glibc's elf.h. */
119 uint32_t a_type
; /* Entry type */
122 uint32_t a_val
; /* Integer value */
123 /* We use to have pointer elements added here. We cannot do that,
124 though, since it does not work when using 32-bit definitions
125 on 64-bit platforms and vice versa. */
130 #ifndef HAVE_ELF64_AUXV_T
131 /* Copied from glibc's elf.h. */
134 uint64_t a_type
; /* Entry type */
137 uint64_t a_val
; /* Integer value */
138 /* We use to have pointer elements added here. We cannot do that,
139 though, since it does not work when using 32-bit definitions
140 on 64-bit platforms and vice versa. */
145 /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
146 representation of the thread ID.
148 ``all_lwps'' is keyed by the process ID - which on Linux is (presently)
149 the same as the LWP ID.
151 ``all_processes'' is keyed by the "overall process ID", which
152 GNU/Linux calls tgid, "thread group ID". */
154 struct inferior_list all_lwps
;
156 /* A list of all unknown processes which receive stop signals. Some
157 other process will presumably claim each of these as forked
158 children momentarily. */
160 struct simple_pid_list
162 /* The process ID. */
165 /* The status as reported by waitpid. */
169 struct simple_pid_list
*next
;
171 struct simple_pid_list
*stopped_pids
;
173 /* Trivial list manipulation functions to keep track of a list of new
174 stopped processes. */
177 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
179 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
182 new_pid
->status
= status
;
183 new_pid
->next
= *listp
;
188 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
190 struct simple_pid_list
**p
;
192 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
193 if ((*p
)->pid
== pid
)
195 struct simple_pid_list
*next
= (*p
)->next
;
197 *statusp
= (*p
)->status
;
205 enum stopping_threads_kind
207 /* Not stopping threads presently. */
208 NOT_STOPPING_THREADS
,
210 /* Stopping threads. */
213 /* Stopping and suspending threads. */
214 STOPPING_AND_SUSPENDING_THREADS
217 /* This is set while stop_all_lwps is in effect. */
218 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
220 /* FIXME make into a target method? */
221 int using_threads
= 1;
223 /* True if we're presently stabilizing threads (moving them out of
225 static int stabilizing_threads
;
227 /* This flag is true iff we've just created or attached to our first
228 inferior but it has not stopped yet. As soon as it does, we need
229 to call the low target's arch_setup callback. Doing this only on
230 the first inferior avoids reinializing the architecture on every
231 inferior, and avoids messing with the register caches of the
232 already running inferiors. NOTE: this assumes all inferiors under
233 control of gdbserver have the same architecture. */
234 static int new_inferior
;
236 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
237 int step
, int signal
, siginfo_t
*info
);
238 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
239 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
240 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
241 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
242 static void *add_lwp (ptid_t ptid
);
243 static int linux_stopped_by_watchpoint (void);
244 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
245 static void proceed_all_lwps (void);
246 static int finish_step_over (struct lwp_info
*lwp
);
247 static CORE_ADDR
get_stop_pc (struct lwp_info
*lwp
);
248 static int kill_lwp (unsigned long lwpid
, int signo
);
249 static void linux_enable_event_reporting (int pid
);
251 /* True if the low target can hardware single-step. Such targets
252 don't need a BREAKPOINT_REINSERT_ADDR callback. */
255 can_hardware_single_step (void)
257 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
260 /* True if the low target supports memory breakpoints. If so, we'll
261 have a GET_PC implementation. */
264 supports_breakpoints (void)
266 return (the_low_target
.get_pc
!= NULL
);
269 /* Returns true if this target can support fast tracepoints. This
270 does not mean that the in-process agent has been loaded in the
274 supports_fast_tracepoints (void)
276 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
279 /* True if LWP is stopped in its stepping range. */
282 lwp_in_step_range (struct lwp_info
*lwp
)
284 CORE_ADDR pc
= lwp
->stop_pc
;
286 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
289 struct pending_signals
293 struct pending_signals
*prev
;
296 #ifdef HAVE_LINUX_REGSETS
297 static char *disabled_regsets
;
298 static int num_regsets
;
301 /* The read/write ends of the pipe registered as waitable file in the
303 static int linux_event_pipe
[2] = { -1, -1 };
305 /* True if we're currently in async mode. */
306 #define target_is_async_p() (linux_event_pipe[0] != -1)
308 static void send_sigstop (struct lwp_info
*lwp
);
309 static void wait_for_sigstop (struct inferior_list_entry
*entry
);
311 /* Return non-zero if HEADER is a 64-bit ELF file. */
314 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
316 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
317 && header
->e_ident
[EI_MAG1
] == ELFMAG1
318 && header
->e_ident
[EI_MAG2
] == ELFMAG2
319 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
321 *machine
= header
->e_machine
;
322 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
329 /* Return non-zero if FILE is a 64-bit ELF file,
330 zero if the file is not a 64-bit ELF file,
331 and -1 if the file is not accessible or doesn't exist. */
334 elf_64_file_p (const char *file
, unsigned int *machine
)
339 fd
= open (file
, O_RDONLY
);
343 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
350 return elf_64_header_p (&header
, machine
);
353 /* Accepts an integer PID; Returns true if the executable PID is
354 running is a 64-bit ELF file.. */
357 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
359 char file
[MAXPATHLEN
];
361 sprintf (file
, "/proc/%d/exe", pid
);
362 return elf_64_file_p (file
, machine
);
366 delete_lwp (struct lwp_info
*lwp
)
368 remove_thread (get_lwp_thread (lwp
));
369 remove_inferior (&all_lwps
, &lwp
->head
);
370 free (lwp
->arch_private
);
374 /* Add a process to the common process list, and set its private
377 static struct process_info
*
378 linux_add_process (int pid
, int attached
)
380 struct process_info
*proc
;
382 /* Is this the first process? If so, then set the arch. */
383 if (all_processes
.head
== NULL
)
386 proc
= add_process (pid
, attached
);
387 proc
->private = xcalloc (1, sizeof (*proc
->private));
389 if (the_low_target
.new_process
!= NULL
)
390 proc
->private->arch_private
= the_low_target
.new_process ();
395 /* Wrapper function for waitpid which handles EINTR, and emulates
396 __WALL for systems where that is not available. */
399 my_waitpid (int pid
, int *status
, int flags
)
404 fprintf (stderr
, "my_waitpid (%d, 0x%x)\n", pid
, flags
);
408 sigset_t block_mask
, org_mask
, wake_mask
;
411 wnohang
= (flags
& WNOHANG
) != 0;
412 flags
&= ~(__WALL
| __WCLONE
);
415 /* Block all signals while here. This avoids knowing about
416 LinuxThread's signals. */
417 sigfillset (&block_mask
);
418 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
420 /* ... except during the sigsuspend below. */
421 sigemptyset (&wake_mask
);
425 /* Since all signals are blocked, there's no need to check
427 ret
= waitpid (pid
, status
, flags
);
430 if (ret
== -1 && out_errno
!= ECHILD
)
435 if (flags
& __WCLONE
)
437 /* We've tried both flavors now. If WNOHANG is set,
438 there's nothing else to do, just bail out. */
443 fprintf (stderr
, "blocking\n");
445 /* Block waiting for signals. */
446 sigsuspend (&wake_mask
);
452 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
457 ret
= waitpid (pid
, status
, flags
);
458 while (ret
== -1 && errno
== EINTR
);
463 fprintf (stderr
, "my_waitpid (%d, 0x%x): status(%x), %d\n",
464 pid
, flags
, status
? *status
: -1, ret
);
470 /* Handle a GNU/Linux extended wait response. If we see a clone
471 event, we need to add the new LWP to our list (and not report the
472 trap to higher layers). */
475 handle_extended_wait (struct lwp_info
*event_child
, int wstat
)
477 int event
= wstat
>> 16;
478 struct lwp_info
*new_lwp
;
480 if (event
== PTRACE_EVENT_CLONE
)
483 unsigned long new_pid
;
486 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_child
), (PTRACE_ARG3_TYPE
) 0,
489 /* If we haven't already seen the new PID stop, wait for it now. */
490 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
492 /* The new child has a pending SIGSTOP. We can't affect it until it
493 hits the SIGSTOP, but we're already attached. */
495 ret
= my_waitpid (new_pid
, &status
, __WALL
);
498 perror_with_name ("waiting for new child");
499 else if (ret
!= new_pid
)
500 warning ("wait returned unexpected PID %d", ret
);
501 else if (!WIFSTOPPED (status
))
502 warning ("wait returned unexpected status 0x%x", status
);
505 ptid
= ptid_build (pid_of (event_child
), new_pid
, 0);
506 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
507 add_thread (ptid
, new_lwp
);
509 /* Either we're going to immediately resume the new thread
510 or leave it stopped. linux_resume_one_lwp is a nop if it
511 thinks the thread is currently running, so set this first
512 before calling linux_resume_one_lwp. */
513 new_lwp
->stopped
= 1;
515 /* If we're suspending all threads, leave this one suspended
517 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
518 new_lwp
->suspended
= 1;
520 /* Normally we will get the pending SIGSTOP. But in some cases
521 we might get another signal delivered to the group first.
522 If we do get another signal, be sure not to lose it. */
523 if (WSTOPSIG (status
) == SIGSTOP
)
525 if (stopping_threads
!= NOT_STOPPING_THREADS
)
526 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
528 linux_resume_one_lwp (new_lwp
, 0, 0, NULL
);
532 new_lwp
->stop_expected
= 1;
534 if (stopping_threads
!= NOT_STOPPING_THREADS
)
536 new_lwp
->stop_pc
= get_stop_pc (new_lwp
);
537 new_lwp
->status_pending_p
= 1;
538 new_lwp
->status_pending
= status
;
541 /* Pass the signal on. This is what GDB does - except
542 shouldn't we really report it instead? */
543 linux_resume_one_lwp (new_lwp
, 0, WSTOPSIG (status
), NULL
);
546 /* Always resume the current thread. If we are stopping
547 threads, it will have a pending SIGSTOP; we may as well
549 linux_resume_one_lwp (event_child
, event_child
->stepping
, 0, NULL
);
553 /* Return the PC as read from the regcache of LWP, without any
557 get_pc (struct lwp_info
*lwp
)
559 struct thread_info
*saved_inferior
;
560 struct regcache
*regcache
;
563 if (the_low_target
.get_pc
== NULL
)
566 saved_inferior
= current_inferior
;
567 current_inferior
= get_lwp_thread (lwp
);
569 regcache
= get_thread_regcache (current_inferior
, 1);
570 pc
= (*the_low_target
.get_pc
) (regcache
);
573 fprintf (stderr
, "pc is 0x%lx\n", (long) pc
);
575 current_inferior
= saved_inferior
;
579 /* This function should only be called if LWP got a SIGTRAP.
580 The SIGTRAP could mean several things.
582 On i386, where decr_pc_after_break is non-zero:
583 If we were single-stepping this process using PTRACE_SINGLESTEP,
584 we will get only the one SIGTRAP (even if the instruction we
585 stepped over was a breakpoint). The value of $eip will be the
587 If we continue the process using PTRACE_CONT, we will get a
588 SIGTRAP when we hit a breakpoint. The value of $eip will be
589 the instruction after the breakpoint (i.e. needs to be
590 decremented). If we report the SIGTRAP to GDB, we must also
591 report the undecremented PC. If we cancel the SIGTRAP, we
592 must resume at the decremented PC.
594 (Presumably, not yet tested) On a non-decr_pc_after_break machine
595 with hardware or kernel single-step:
596 If we single-step over a breakpoint instruction, our PC will
597 point at the following instruction. If we continue and hit a
598 breakpoint instruction, our PC will point at the breakpoint
602 get_stop_pc (struct lwp_info
*lwp
)
606 if (the_low_target
.get_pc
== NULL
)
609 stop_pc
= get_pc (lwp
);
611 if (WSTOPSIG (lwp
->last_status
) == SIGTRAP
613 && !lwp
->stopped_by_watchpoint
614 && lwp
->last_status
>> 16 == 0)
615 stop_pc
-= the_low_target
.decr_pc_after_break
;
618 fprintf (stderr
, "stop pc is 0x%lx\n", (long) stop_pc
);
624 add_lwp (ptid_t ptid
)
626 struct lwp_info
*lwp
;
628 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
629 memset (lwp
, 0, sizeof (*lwp
));
633 if (the_low_target
.new_thread
!= NULL
)
634 lwp
->arch_private
= the_low_target
.new_thread ();
636 add_inferior_to_list (&all_lwps
, &lwp
->head
);
641 /* Start an inferior process and returns its pid.
642 ALLARGS is a vector of program-name and args. */
645 linux_create_inferior (char *program
, char **allargs
)
647 #ifdef HAVE_PERSONALITY
648 int personality_orig
= 0, personality_set
= 0;
650 struct lwp_info
*new_lwp
;
654 #ifdef HAVE_PERSONALITY
655 if (disable_randomization
)
658 personality_orig
= personality (0xffffffff);
659 if (errno
== 0 && !(personality_orig
& ADDR_NO_RANDOMIZE
))
662 personality (personality_orig
| ADDR_NO_RANDOMIZE
);
664 if (errno
!= 0 || (personality_set
665 && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE
)))
666 warning ("Error disabling address space randomization: %s",
671 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
677 perror_with_name ("fork");
681 ptrace (PTRACE_TRACEME
, 0, (PTRACE_ARG3_TYPE
) 0, (PTRACE_ARG4_TYPE
) 0);
683 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
684 signal (__SIGRTMIN
+ 1, SIG_DFL
);
689 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
690 stdout to stderr so that inferior i/o doesn't corrupt the connection.
691 Also, redirect stdin to /dev/null. */
692 if (remote_connection_is_stdio ())
695 open ("/dev/null", O_RDONLY
);
697 if (write (2, "stdin/stdout redirected\n",
698 sizeof ("stdin/stdout redirected\n") - 1) < 0)
700 /* Errors ignored. */;
704 execv (program
, allargs
);
706 execvp (program
, allargs
);
708 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
714 #ifdef HAVE_PERSONALITY
718 personality (personality_orig
);
720 warning ("Error restoring address space randomization: %s",
725 linux_add_process (pid
, 0);
727 ptid
= ptid_build (pid
, pid
, 0);
728 new_lwp
= add_lwp (ptid
);
729 add_thread (ptid
, new_lwp
);
730 new_lwp
->must_set_ptrace_flags
= 1;
735 /* Attach to an inferior process. */
738 linux_attach_lwp_1 (unsigned long lwpid
, int initial
)
741 struct lwp_info
*new_lwp
;
743 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_ARG3_TYPE
) 0, (PTRACE_ARG4_TYPE
) 0)
746 struct buffer buffer
;
750 /* If we fail to attach to an LWP, just warn. */
751 fprintf (stderr
, "Cannot attach to lwp %ld: %s (%d)\n", lwpid
,
752 strerror (errno
), errno
);
757 /* If we fail to attach to a process, report an error. */
758 buffer_init (&buffer
);
759 linux_ptrace_attach_warnings (lwpid
, &buffer
);
760 buffer_grow_str0 (&buffer
, "");
761 error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer
),
762 lwpid
, strerror (errno
), errno
);
766 /* If lwp is the tgid, we handle adding existing threads later.
767 Otherwise we just add lwp without bothering about any other
769 ptid
= ptid_build (lwpid
, lwpid
, 0);
772 /* Note that extracting the pid from the current inferior is
773 safe, since we're always called in the context of the same
774 process as this new thread. */
775 int pid
= pid_of (get_thread_lwp (current_inferior
));
776 ptid
= ptid_build (pid
, lwpid
, 0);
779 new_lwp
= (struct lwp_info
*) add_lwp (ptid
);
780 add_thread (ptid
, new_lwp
);
782 /* We need to wait for SIGSTOP before being able to make the next
783 ptrace call on this LWP. */
784 new_lwp
->must_set_ptrace_flags
= 1;
786 if (linux_proc_pid_is_stopped (lwpid
))
790 "Attached to a stopped process\n");
792 /* The process is definitely stopped. It is in a job control
793 stop, unless the kernel predates the TASK_STOPPED /
794 TASK_TRACED distinction, in which case it might be in a
795 ptrace stop. Make sure it is in a ptrace stop; from there we
796 can kill it, signal it, et cetera.
798 First make sure there is a pending SIGSTOP. Since we are
799 already attached, the process can not transition from stopped
800 to running without a PTRACE_CONT; so we know this signal will
801 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
802 probably already in the queue (unless this kernel is old
803 enough to use TASK_STOPPED for ptrace stops); but since
804 SIGSTOP is not an RT signal, it can only be queued once. */
805 kill_lwp (lwpid
, SIGSTOP
);
807 /* Finally, resume the stopped process. This will deliver the
808 SIGSTOP (or a higher priority signal, just like normal
809 PTRACE_ATTACH), which we'll catch later on. */
810 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_ARG3_TYPE
) 0, (PTRACE_ARG4_TYPE
) 0);
813 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
816 There are several cases to consider here:
818 1) gdbserver has already attached to the process and is being notified
819 of a new thread that is being created.
820 In this case we should ignore that SIGSTOP and resume the
821 process. This is handled below by setting stop_expected = 1,
822 and the fact that add_thread sets last_resume_kind ==
825 2) This is the first thread (the process thread), and we're attaching
826 to it via attach_inferior.
827 In this case we want the process thread to stop.
828 This is handled by having linux_attach set last_resume_kind ==
829 resume_stop after we return.
831 If the pid we are attaching to is also the tgid, we attach to and
832 stop all the existing threads. Otherwise, we attach to pid and
833 ignore any other threads in the same group as this pid.
835 3) GDB is connecting to gdbserver and is requesting an enumeration of all
837 In this case we want the thread to stop.
838 FIXME: This case is currently not properly handled.
839 We should wait for the SIGSTOP but don't. Things work apparently
840 because enough time passes between when we ptrace (ATTACH) and when
841 gdb makes the next ptrace call on the thread.
843 On the other hand, if we are currently trying to stop all threads, we
844 should treat the new thread as if we had sent it a SIGSTOP. This works
845 because we are guaranteed that the add_lwp call above added us to the
846 end of the list, and so the new thread has not yet reached
847 wait_for_sigstop (but will). */
848 new_lwp
->stop_expected
= 1;
852 linux_attach_lwp (unsigned long lwpid
)
854 linux_attach_lwp_1 (lwpid
, 0);
857 /* Attach to PID. If PID is the tgid, attach to it and all
861 linux_attach (unsigned long pid
)
863 /* Attach to PID. We will check for other threads
865 linux_attach_lwp_1 (pid
, 1);
866 linux_add_process (pid
, 1);
870 struct thread_info
*thread
;
872 /* Don't ignore the initial SIGSTOP if we just attached to this
873 process. It will be collected by wait shortly. */
874 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
875 thread
->last_resume_kind
= resume_stop
;
878 if (linux_proc_get_tgid (pid
) == pid
)
883 sprintf (pathname
, "/proc/%ld/task", pid
);
885 dir
= opendir (pathname
);
889 fprintf (stderr
, "Could not open /proc/%ld/task.\n", pid
);
894 /* At this point we attached to the tgid. Scan the task for
897 int new_threads_found
;
901 while (iterations
< 2)
903 new_threads_found
= 0;
904 /* Add all the other threads. While we go through the
905 threads, new threads may be spawned. Cycle through
906 the list of threads until we have done two iterations without
907 finding new threads. */
908 while ((dp
= readdir (dir
)) != NULL
)
911 lwp
= strtoul (dp
->d_name
, NULL
, 10);
913 /* Is this a new thread? */
915 && find_thread_ptid (ptid_build (pid
, lwp
, 0)) == NULL
)
917 linux_attach_lwp_1 (lwp
, 0);
922 Found and attached to new lwp %ld\n", lwp
);
926 if (!new_threads_found
)
947 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
949 struct counter
*counter
= args
;
951 if (ptid_get_pid (entry
->id
) == counter
->pid
)
953 if (++counter
->count
> 1)
961 last_thread_of_process_p (struct thread_info
*thread
)
963 ptid_t ptid
= ((struct inferior_list_entry
*)thread
)->id
;
964 int pid
= ptid_get_pid (ptid
);
965 struct counter counter
= { pid
, 0 };
967 return (find_inferior (&all_threads
,
968 second_thread_of_pid_p
, &counter
) == NULL
);
974 linux_kill_one_lwp (struct lwp_info
*lwp
)
976 int pid
= lwpid_of (lwp
);
978 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
979 there is no signal context, and ptrace(PTRACE_KILL) (or
980 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
981 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
982 alternative is to kill with SIGKILL. We only need one SIGKILL
983 per process, not one for each thread. But since we still support
984 linuxthreads, and we also support debugging programs using raw
985 clone without CLONE_THREAD, we send one for each thread. For
986 years, we used PTRACE_KILL only, so we're being a bit paranoid
987 about some old kernels where PTRACE_KILL might work better
988 (dubious if there are any such, but that's why it's paranoia), so
989 we try SIGKILL first, PTRACE_KILL second, and so we're fine
996 "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
997 target_pid_to_str (ptid_of (lwp
)),
998 errno
? strerror (errno
) : "OK");
1001 ptrace (PTRACE_KILL
, pid
, (PTRACE_ARG3_TYPE
) 0, (PTRACE_ARG4_TYPE
) 0);
1004 "LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1005 target_pid_to_str (ptid_of (lwp
)),
1006 errno
? strerror (errno
) : "OK");
1009 /* Callback for `find_inferior'. Kills an lwp of a given process,
1010 except the leader. */
1013 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1015 struct thread_info
*thread
= (struct thread_info
*) entry
;
1016 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1018 int pid
= * (int *) args
;
1020 if (ptid_get_pid (entry
->id
) != pid
)
1023 /* We avoid killing the first thread here, because of a Linux kernel (at
1024 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1025 the children get a chance to be reaped, it will remain a zombie
1028 if (lwpid_of (lwp
) == pid
)
1031 fprintf (stderr
, "lkop: is last of process %s\n",
1032 target_pid_to_str (entry
->id
));
1038 linux_kill_one_lwp (lwp
);
1040 /* Make sure it died. The loop is most likely unnecessary. */
1041 pid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
1042 } while (pid
> 0 && WIFSTOPPED (wstat
));
1048 linux_kill (int pid
)
1050 struct process_info
*process
;
1051 struct lwp_info
*lwp
;
1055 process
= find_process_pid (pid
);
1056 if (process
== NULL
)
1059 /* If we're killing a running inferior, make sure it is stopped
1060 first, as PTRACE_KILL will not work otherwise. */
1061 stop_all_lwps (0, NULL
);
1063 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1065 /* See the comment in linux_kill_one_lwp. We did not kill the first
1066 thread in the list, so do so now. */
1067 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1072 fprintf (stderr
, "lk_1: cannot find lwp %ld, for pid: %d\n",
1073 lwpid_of (lwp
), pid
);
1078 fprintf (stderr
, "lk_1: killing lwp %ld, for pid: %d\n",
1079 lwpid_of (lwp
), pid
);
1083 linux_kill_one_lwp (lwp
);
1085 /* Make sure it died. The loop is most likely unnecessary. */
1086 lwpid
= linux_wait_for_event (lwp
->head
.id
, &wstat
, __WALL
);
1087 } while (lwpid
> 0 && WIFSTOPPED (wstat
));
1090 the_target
->mourn (process
);
1092 /* Since we presently can only stop all lwps of all processes, we
1093 need to unstop lwps of other processes. */
1094 unstop_all_lwps (0, NULL
);
1098 /* Get pending signal of THREAD, for detaching purposes. This is the
1099 signal the thread last stopped for, which we need to deliver to the
1100 thread when detaching, otherwise, it'd be suppressed/lost. */
1103 get_detach_signal (struct thread_info
*thread
)
1105 enum gdb_signal signo
= GDB_SIGNAL_0
;
1107 struct lwp_info
*lp
= get_thread_lwp (thread
);
1109 if (lp
->status_pending_p
)
1110 status
= lp
->status_pending
;
1113 /* If the thread had been suspended by gdbserver, and it stopped
1114 cleanly, then it'll have stopped with SIGSTOP. But we don't
1115 want to deliver that SIGSTOP. */
1116 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1117 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1120 /* Otherwise, we may need to deliver the signal we
1122 status
= lp
->last_status
;
1125 if (!WIFSTOPPED (status
))
1129 "GPS: lwp %s hasn't stopped: no pending signal\n",
1130 target_pid_to_str (ptid_of (lp
)));
1134 /* Extended wait statuses aren't real SIGTRAPs. */
1135 if (WSTOPSIG (status
) == SIGTRAP
&& status
>> 16 != 0)
1139 "GPS: lwp %s had stopped with extended "
1140 "status: no pending signal\n",
1141 target_pid_to_str (ptid_of (lp
)));
1145 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1147 if (program_signals_p
&& !program_signals
[signo
])
1151 "GPS: lwp %s had signal %s, but it is in nopass state\n",
1152 target_pid_to_str (ptid_of (lp
)),
1153 gdb_signal_to_string (signo
));
1156 else if (!program_signals_p
1157 /* If we have no way to know which signals GDB does not
1158 want to have passed to the program, assume
1159 SIGTRAP/SIGINT, which is GDB's default. */
1160 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1164 "GPS: lwp %s had signal %s, "
1165 "but we don't know if we should pass it. Default to not.\n",
1166 target_pid_to_str (ptid_of (lp
)),
1167 gdb_signal_to_string (signo
));
1174 "GPS: lwp %s has pending signal %s: delivering it.\n",
1175 target_pid_to_str (ptid_of (lp
)),
1176 gdb_signal_to_string (signo
));
1178 return WSTOPSIG (status
);
1183 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1185 struct thread_info
*thread
= (struct thread_info
*) entry
;
1186 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1187 int pid
= * (int *) args
;
1190 if (ptid_get_pid (entry
->id
) != pid
)
1193 /* If there is a pending SIGSTOP, get rid of it. */
1194 if (lwp
->stop_expected
)
1198 "Sending SIGCONT to %s\n",
1199 target_pid_to_str (ptid_of (lwp
)));
1201 kill_lwp (lwpid_of (lwp
), SIGCONT
);
1202 lwp
->stop_expected
= 0;
1205 /* Flush any pending changes to the process's registers. */
1206 regcache_invalidate_one ((struct inferior_list_entry
*)
1207 get_lwp_thread (lwp
));
1209 /* Pass on any pending signal for this thread. */
1210 sig
= get_detach_signal (thread
);
1212 /* Finally, let it resume. */
1213 if (the_low_target
.prepare_to_resume
!= NULL
)
1214 the_low_target
.prepare_to_resume (lwp
);
1215 if (ptrace (PTRACE_DETACH
, lwpid_of (lwp
), (PTRACE_ARG3_TYPE
) 0,
1216 (PTRACE_ARG4_TYPE
) (long) sig
) < 0)
1217 error (_("Can't detach %s: %s"),
1218 target_pid_to_str (ptid_of (lwp
)),
1226 linux_detach (int pid
)
1228 struct process_info
*process
;
1230 process
= find_process_pid (pid
);
1231 if (process
== NULL
)
1234 /* Stop all threads before detaching. First, ptrace requires that
1235 the thread is stopped to sucessfully detach. Second, thread_db
1236 may need to uninstall thread event breakpoints from memory, which
1237 only works with a stopped process anyway. */
1238 stop_all_lwps (0, NULL
);
1240 #ifdef USE_THREAD_DB
1241 thread_db_detach (process
);
1244 /* Stabilize threads (move out of jump pads). */
1245 stabilize_threads ();
1247 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1249 the_target
->mourn (process
);
1251 /* Since we presently can only stop all lwps of all processes, we
1252 need to unstop lwps of other processes. */
1253 unstop_all_lwps (0, NULL
);
1257 /* Remove all LWPs that belong to process PROC from the lwp list. */
1260 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1262 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1263 struct process_info
*process
= proc
;
1265 if (pid_of (lwp
) == pid_of (process
))
1272 linux_mourn (struct process_info
*process
)
1274 struct process_info_private
*priv
;
1276 #ifdef USE_THREAD_DB
1277 thread_db_mourn (process
);
1280 find_inferior (&all_lwps
, delete_lwp_callback
, process
);
1282 /* Freeing all private data. */
1283 priv
= process
->private;
1284 free (priv
->arch_private
);
1286 process
->private = NULL
;
1288 remove_process (process
);
1292 linux_join (int pid
)
1297 ret
= my_waitpid (pid
, &status
, 0);
1298 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1300 } while (ret
!= -1 || errno
!= ECHILD
);
1303 /* Return nonzero if the given thread is still alive. */
1305 linux_thread_alive (ptid_t ptid
)
1307 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1309 /* We assume we always know if a thread exits. If a whole process
1310 exited but we still haven't been able to report it to GDB, we'll
1311 hold on to the last lwp of the dead process. */
1318 /* Return 1 if this lwp has an interesting status pending. */
1320 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1322 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
1323 ptid_t ptid
= * (ptid_t
*) arg
;
1324 struct thread_info
*thread
;
1326 /* Check if we're only interested in events from a specific process
1328 if (!ptid_equal (minus_one_ptid
, ptid
)
1329 && ptid_get_pid (ptid
) != ptid_get_pid (lwp
->head
.id
))
1332 thread
= get_lwp_thread (lwp
);
1334 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1335 report any status pending the LWP may have. */
1336 if (thread
->last_resume_kind
== resume_stop
1337 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1340 return lwp
->status_pending_p
;
1344 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1346 ptid_t ptid
= *(ptid_t
*) data
;
1349 if (ptid_get_lwp (ptid
) != 0)
1350 lwp
= ptid_get_lwp (ptid
);
1352 lwp
= ptid_get_pid (ptid
);
1354 if (ptid_get_lwp (entry
->id
) == lwp
)
1361 find_lwp_pid (ptid_t ptid
)
1363 return (struct lwp_info
*) find_inferior (&all_lwps
, same_lwp
, &ptid
);
1366 static struct lwp_info
*
1367 linux_wait_for_lwp (ptid_t ptid
, int *wstatp
, int options
)
1370 int to_wait_for
= -1;
1371 struct lwp_info
*child
= NULL
;
1374 fprintf (stderr
, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid
));
1376 if (ptid_equal (ptid
, minus_one_ptid
))
1377 to_wait_for
= -1; /* any child */
1379 to_wait_for
= ptid_get_lwp (ptid
); /* this lwp only */
1385 ret
= my_waitpid (to_wait_for
, wstatp
, options
);
1386 if (ret
== 0 || (ret
== -1 && errno
== ECHILD
&& (options
& WNOHANG
)))
1389 perror_with_name ("waitpid");
1392 && (!WIFSTOPPED (*wstatp
)
1393 || (WSTOPSIG (*wstatp
) != 32
1394 && WSTOPSIG (*wstatp
) != 33)))
1395 fprintf (stderr
, "Got an event from %d (%x)\n", ret
, *wstatp
);
1397 child
= find_lwp_pid (pid_to_ptid (ret
));
1399 /* If we didn't find a process, one of two things presumably happened:
1400 - A process we started and then detached from has exited. Ignore it.
1401 - A process we are controlling has forked and the new child's stop
1402 was reported to us by the kernel. Save its PID. */
1403 if (child
== NULL
&& WIFSTOPPED (*wstatp
))
1405 add_to_pid_list (&stopped_pids
, ret
, *wstatp
);
1408 else if (child
== NULL
)
1413 child
->last_status
= *wstatp
;
1415 /* Architecture-specific setup after inferior is running.
1416 This needs to happen after we have attached to the inferior
1417 and it is stopped for the first time, but before we access
1418 any inferior registers. */
1421 the_low_target
.arch_setup ();
1422 #ifdef HAVE_LINUX_REGSETS
1423 memset (disabled_regsets
, 0, num_regsets
);
1428 /* Fetch the possibly triggered data watchpoint info and store it in
1431 On some archs, like x86, that use debug registers to set
1432 watchpoints, it's possible that the way to know which watched
1433 address trapped, is to check the register that is used to select
1434 which address to watch. Problem is, between setting the
1435 watchpoint and reading back which data address trapped, the user
1436 may change the set of watchpoints, and, as a consequence, GDB
1437 changes the debug registers in the inferior. To avoid reading
1438 back a stale stopped-data-address when that happens, we cache in
1439 LP the fact that a watchpoint trapped, and the corresponding data
1440 address, as soon as we see CHILD stop with a SIGTRAP. If GDB
1441 changes the debug registers meanwhile, we have the cached data we
1444 if (WIFSTOPPED (*wstatp
) && WSTOPSIG (*wstatp
) == SIGTRAP
)
1446 if (the_low_target
.stopped_by_watchpoint
== NULL
)
1448 child
->stopped_by_watchpoint
= 0;
1452 struct thread_info
*saved_inferior
;
1454 saved_inferior
= current_inferior
;
1455 current_inferior
= get_lwp_thread (child
);
1457 child
->stopped_by_watchpoint
1458 = the_low_target
.stopped_by_watchpoint ();
1460 if (child
->stopped_by_watchpoint
)
1462 if (the_low_target
.stopped_data_address
!= NULL
)
1463 child
->stopped_data_address
1464 = the_low_target
.stopped_data_address ();
1466 child
->stopped_data_address
= 0;
1469 current_inferior
= saved_inferior
;
1473 /* Store the STOP_PC, with adjustment applied. This depends on the
1474 architecture being defined already (so that CHILD has a valid
1475 regcache), and on LAST_STATUS being set (to check for SIGTRAP or
1477 if (WIFSTOPPED (*wstatp
))
1478 child
->stop_pc
= get_stop_pc (child
);
1481 && WIFSTOPPED (*wstatp
)
1482 && the_low_target
.get_pc
!= NULL
)
1484 struct thread_info
*saved_inferior
= current_inferior
;
1485 struct regcache
*regcache
;
1488 current_inferior
= get_lwp_thread (child
);
1489 regcache
= get_thread_regcache (current_inferior
, 1);
1490 pc
= (*the_low_target
.get_pc
) (regcache
);
1491 fprintf (stderr
, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc
);
1492 current_inferior
= saved_inferior
;
1498 /* This function should only be called if the LWP got a SIGTRAP.
1500 Handle any tracepoint steps or hits. Return true if a tracepoint
1501 event was handled, 0 otherwise. */
1504 handle_tracepoints (struct lwp_info
*lwp
)
1506 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1507 int tpoint_related_event
= 0;
1509 /* If this tracepoint hit causes a tracing stop, we'll immediately
1510 uninsert tracepoints. To do this, we temporarily pause all
1511 threads, unpatch away, and then unpause threads. We need to make
1512 sure the unpausing doesn't resume LWP too. */
1515 /* And we need to be sure that any all-threads-stopping doesn't try
1516 to move threads out of the jump pads, as it could deadlock the
1517 inferior (LWP could be in the jump pad, maybe even holding the
1520 /* Do any necessary step collect actions. */
1521 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1523 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1525 /* See if we just hit a tracepoint and do its main collect
1527 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1531 gdb_assert (lwp
->suspended
== 0);
1532 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1534 if (tpoint_related_event
)
1537 fprintf (stderr
, "got a tracepoint event\n");
1544 /* Convenience wrapper. Returns true if LWP is presently collecting a
1548 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1549 struct fast_tpoint_collect_status
*status
)
1551 CORE_ADDR thread_area
;
1553 if (the_low_target
.get_thread_area
== NULL
)
1556 /* Get the thread area address. This is used to recognize which
1557 thread is which when tracing with the in-process agent library.
1558 We don't read anything from the address, and treat it as opaque;
1559 it's the address itself that we assume is unique per-thread. */
1560 if ((*the_low_target
.get_thread_area
) (lwpid_of (lwp
), &thread_area
) == -1)
1563 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1566 /* The reason we resume in the caller, is because we want to be able
1567 to pass lwp->status_pending as WSTAT, and we need to clear
1568 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1569 refuses to resume. */
1572 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1574 struct thread_info
*saved_inferior
;
1576 saved_inferior
= current_inferior
;
1577 current_inferior
= get_lwp_thread (lwp
);
1580 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1581 && supports_fast_tracepoints ()
1582 && agent_loaded_p ())
1584 struct fast_tpoint_collect_status status
;
1589 Checking whether LWP %ld needs to move out of the jump pad.\n",
1592 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1595 || (WSTOPSIG (*wstat
) != SIGILL
1596 && WSTOPSIG (*wstat
) != SIGFPE
1597 && WSTOPSIG (*wstat
) != SIGSEGV
1598 && WSTOPSIG (*wstat
) != SIGBUS
))
1600 lwp
->collecting_fast_tracepoint
= r
;
1604 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1606 /* Haven't executed the original instruction yet.
1607 Set breakpoint there, and wait till it's hit,
1608 then single-step until exiting the jump pad. */
1609 lwp
->exit_jump_pad_bkpt
1610 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1615 Checking whether LWP %ld needs to move out of the jump pad...it does\n",
1617 current_inferior
= saved_inferior
;
1624 /* If we get a synchronous signal while collecting, *and*
1625 while executing the (relocated) original instruction,
1626 reset the PC to point at the tpoint address, before
1627 reporting to GDB. Otherwise, it's an IPA lib bug: just
1628 report the signal to GDB, and pray for the best. */
1630 lwp
->collecting_fast_tracepoint
= 0;
1633 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1634 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1637 struct regcache
*regcache
;
1639 /* The si_addr on a few signals references the address
1640 of the faulting instruction. Adjust that as
1642 if ((WSTOPSIG (*wstat
) == SIGILL
1643 || WSTOPSIG (*wstat
) == SIGFPE
1644 || WSTOPSIG (*wstat
) == SIGBUS
1645 || WSTOPSIG (*wstat
) == SIGSEGV
)
1646 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
),
1647 (PTRACE_ARG3_TYPE
) 0, &info
) == 0
1648 /* Final check just to make sure we don't clobber
1649 the siginfo of non-kernel-sent signals. */
1650 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1652 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1653 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
),
1654 (PTRACE_ARG3_TYPE
) 0, &info
);
1657 regcache
= get_thread_regcache (get_lwp_thread (lwp
), 1);
1658 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1659 lwp
->stop_pc
= status
.tpoint_addr
;
1661 /* Cancel any fast tracepoint lock this thread was
1663 force_unlock_trace_buffer ();
1666 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1670 "Cancelling fast exit-jump-pad: removing bkpt. "
1671 "stopping all threads momentarily.\n");
1673 stop_all_lwps (1, lwp
);
1674 cancel_breakpoints ();
1676 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1677 lwp
->exit_jump_pad_bkpt
= NULL
;
1679 unstop_all_lwps (1, lwp
);
1681 gdb_assert (lwp
->suspended
>= 0);
1688 Checking whether LWP %ld needs to move out of the jump pad...no\n",
1691 current_inferior
= saved_inferior
;
1695 /* Enqueue one signal in the "signals to report later when out of the
1699 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1701 struct pending_signals
*p_sig
;
1705 Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat
), lwpid_of (lwp
));
1709 struct pending_signals
*sig
;
1711 for (sig
= lwp
->pending_signals_to_report
;
1715 " Already queued %d\n",
1718 fprintf (stderr
, " (no more currently queued signals)\n");
1721 /* Don't enqueue non-RT signals if they are already in the deferred
1722 queue. (SIGSTOP being the easiest signal to see ending up here
1724 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1726 struct pending_signals
*sig
;
1728 for (sig
= lwp
->pending_signals_to_report
;
1732 if (sig
->signal
== WSTOPSIG (*wstat
))
1736 "Not requeuing already queued non-RT signal %d"
1745 p_sig
= xmalloc (sizeof (*p_sig
));
1746 p_sig
->prev
= lwp
->pending_signals_to_report
;
1747 p_sig
->signal
= WSTOPSIG (*wstat
);
1748 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1749 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_ARG3_TYPE
) 0,
1752 lwp
->pending_signals_to_report
= p_sig
;
1755 /* Dequeue one signal from the "signals to report later when out of
1756 the jump pad" list. */
1759 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1761 if (lwp
->pending_signals_to_report
!= NULL
)
1763 struct pending_signals
**p_sig
;
1765 p_sig
= &lwp
->pending_signals_to_report
;
1766 while ((*p_sig
)->prev
!= NULL
)
1767 p_sig
= &(*p_sig
)->prev
;
1769 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1770 if ((*p_sig
)->info
.si_signo
!= 0)
1771 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_ARG3_TYPE
) 0,
1777 fprintf (stderr
, "Reporting deferred signal %d for LWP %ld.\n",
1778 WSTOPSIG (*wstat
), lwpid_of (lwp
));
1782 struct pending_signals
*sig
;
1784 for (sig
= lwp
->pending_signals_to_report
;
1788 " Still queued %d\n",
1791 fprintf (stderr
, " (no more queued signals)\n");
1800 /* Arrange for a breakpoint to be hit again later. We don't keep the
1801 SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
1802 will handle the current event, eventually we will resume this LWP,
1803 and this breakpoint will trap again. */
1806 cancel_breakpoint (struct lwp_info
*lwp
)
1808 struct thread_info
*saved_inferior
;
1810 /* There's nothing to do if we don't support breakpoints. */
1811 if (!supports_breakpoints ())
1814 /* breakpoint_at reads from current inferior. */
1815 saved_inferior
= current_inferior
;
1816 current_inferior
= get_lwp_thread (lwp
);
1818 if ((*the_low_target
.breakpoint_at
) (lwp
->stop_pc
))
1822 "CB: Push back breakpoint for %s\n",
1823 target_pid_to_str (ptid_of (lwp
)));
1825 /* Back up the PC if necessary. */
1826 if (the_low_target
.decr_pc_after_break
)
1828 struct regcache
*regcache
1829 = get_thread_regcache (current_inferior
, 1);
1830 (*the_low_target
.set_pc
) (regcache
, lwp
->stop_pc
);
1833 current_inferior
= saved_inferior
;
1840 "CB: No breakpoint found at %s for [%s]\n",
1841 paddress (lwp
->stop_pc
),
1842 target_pid_to_str (ptid_of (lwp
)));
1845 current_inferior
= saved_inferior
;
1849 /* When the event-loop is doing a step-over, this points at the thread
1851 ptid_t step_over_bkpt
;
1853 /* Wait for an event from child PID. If PID is -1, wait for any
1854 child. Store the stop status through the status pointer WSTAT.
1855 OPTIONS is passed to the waitpid call. Return 0 if no child stop
1856 event was found and OPTIONS contains WNOHANG. Return the PID of
1857 the stopped child otherwise. */
1860 linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
)
1862 struct lwp_info
*event_child
, *requested_child
;
1866 requested_child
= NULL
;
1868 /* Check for a lwp with a pending status. */
1870 if (ptid_equal (ptid
, minus_one_ptid
) || ptid_is_pid (ptid
))
1872 event_child
= (struct lwp_info
*)
1873 find_inferior (&all_lwps
, status_pending_p_callback
, &ptid
);
1874 if (debug_threads
&& event_child
)
1875 fprintf (stderr
, "Got a pending child %ld\n", lwpid_of (event_child
));
1879 requested_child
= find_lwp_pid (ptid
);
1881 if (stopping_threads
== NOT_STOPPING_THREADS
1882 && requested_child
->status_pending_p
1883 && requested_child
->collecting_fast_tracepoint
)
1885 enqueue_one_deferred_signal (requested_child
,
1886 &requested_child
->status_pending
);
1887 requested_child
->status_pending_p
= 0;
1888 requested_child
->status_pending
= 0;
1889 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
1892 if (requested_child
->suspended
1893 && requested_child
->status_pending_p
)
1894 fatal ("requesting an event out of a suspended child?");
1896 if (requested_child
->status_pending_p
)
1897 event_child
= requested_child
;
1900 if (event_child
!= NULL
)
1903 fprintf (stderr
, "Got an event from pending child %ld (%04x)\n",
1904 lwpid_of (event_child
), event_child
->status_pending
);
1905 *wstat
= event_child
->status_pending
;
1906 event_child
->status_pending_p
= 0;
1907 event_child
->status_pending
= 0;
1908 current_inferior
= get_lwp_thread (event_child
);
1909 return lwpid_of (event_child
);
1912 if (ptid_is_pid (ptid
))
1914 /* A request to wait for a specific tgid. This is not possible
1915 with waitpid, so instead, we wait for any child, and leave
1916 children we're not interested in right now with a pending
1917 status to report later. */
1918 wait_ptid
= minus_one_ptid
;
1923 /* We only enter this loop if no process has a pending wait status. Thus
1924 any action taken in response to a wait status inside this loop is
1925 responding as soon as we detect the status, not after any pending
1929 event_child
= linux_wait_for_lwp (wait_ptid
, wstat
, options
);
1931 if ((options
& WNOHANG
) && event_child
== NULL
)
1934 fprintf (stderr
, "WNOHANG set, no event found\n");
1938 if (event_child
== NULL
)
1939 error ("event from unknown child");
1941 if (ptid_is_pid (ptid
)
1942 && ptid_get_pid (ptid
) != ptid_get_pid (ptid_of (event_child
)))
1944 if (! WIFSTOPPED (*wstat
))
1945 mark_lwp_dead (event_child
, *wstat
);
1948 event_child
->status_pending_p
= 1;
1949 event_child
->status_pending
= *wstat
;
1954 current_inferior
= get_lwp_thread (event_child
);
1956 /* Check for thread exit. */
1957 if (! WIFSTOPPED (*wstat
))
1960 fprintf (stderr
, "LWP %ld exiting\n", lwpid_of (event_child
));
1962 /* If the last thread is exiting, just return. */
1963 if (last_thread_of_process_p (current_inferior
))
1966 fprintf (stderr
, "LWP %ld is last lwp of process\n",
1967 lwpid_of (event_child
));
1968 return lwpid_of (event_child
);
1973 current_inferior
= (struct thread_info
*) all_threads
.head
;
1975 fprintf (stderr
, "Current inferior is now %ld\n",
1976 lwpid_of (get_thread_lwp (current_inferior
)));
1980 current_inferior
= NULL
;
1982 fprintf (stderr
, "Current inferior is now <NULL>\n");
1985 /* If we were waiting for this particular child to do something...
1986 well, it did something. */
1987 if (requested_child
!= NULL
)
1989 int lwpid
= lwpid_of (event_child
);
1991 /* Cancel the step-over operation --- the thread that
1992 started it is gone. */
1993 if (finish_step_over (event_child
))
1994 unstop_all_lwps (1, event_child
);
1995 delete_lwp (event_child
);
1999 delete_lwp (event_child
);
2001 /* Wait for a more interesting event. */
2005 if (event_child
->must_set_ptrace_flags
)
2007 linux_enable_event_reporting (lwpid_of (event_child
));
2008 event_child
->must_set_ptrace_flags
= 0;
2011 if (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) == SIGTRAP
2012 && *wstat
>> 16 != 0)
2014 handle_extended_wait (event_child
, *wstat
);
2018 if (WIFSTOPPED (*wstat
)
2019 && WSTOPSIG (*wstat
) == SIGSTOP
2020 && event_child
->stop_expected
)
2025 fprintf (stderr
, "Expected stop.\n");
2026 event_child
->stop_expected
= 0;
2028 should_stop
= (current_inferior
->last_resume_kind
== resume_stop
2029 || stopping_threads
!= NOT_STOPPING_THREADS
);
2033 linux_resume_one_lwp (event_child
,
2034 event_child
->stepping
, 0, NULL
);
2039 return lwpid_of (event_child
);
2046 /* Count the LWP's that have had events. */
2049 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2051 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2052 struct thread_info
*thread
= get_lwp_thread (lp
);
2055 gdb_assert (count
!= NULL
);
2057 /* Count only resumed LWPs that have a SIGTRAP event pending that
2058 should be reported to GDB. */
2059 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2060 && thread
->last_resume_kind
!= resume_stop
2061 && lp
->status_pending_p
2062 && WIFSTOPPED (lp
->status_pending
)
2063 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2064 && !breakpoint_inserted_here (lp
->stop_pc
))
2070 /* Select the LWP (if any) that is currently being single-stepped. */
2073 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2075 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2076 struct thread_info
*thread
= get_lwp_thread (lp
);
2078 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2079 && thread
->last_resume_kind
== resume_step
2080 && lp
->status_pending_p
)
2086 /* Select the Nth LWP that has had a SIGTRAP event that should be
2090 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2092 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2093 struct thread_info
*thread
= get_lwp_thread (lp
);
2094 int *selector
= data
;
2096 gdb_assert (selector
!= NULL
);
2098 /* Select only resumed LWPs that have a SIGTRAP event pending. */
2099 if (thread
->last_resume_kind
!= resume_stop
2100 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2101 && lp
->status_pending_p
2102 && WIFSTOPPED (lp
->status_pending
)
2103 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2104 && !breakpoint_inserted_here (lp
->stop_pc
))
2105 if ((*selector
)-- == 0)
2112 cancel_breakpoints_callback (struct inferior_list_entry
*entry
, void *data
)
2114 struct lwp_info
*lp
= (struct lwp_info
*) entry
;
2115 struct thread_info
*thread
= get_lwp_thread (lp
);
2116 struct lwp_info
*event_lp
= data
;
2118 /* Leave the LWP that has been elected to receive a SIGTRAP alone. */
2122 /* If a LWP other than the LWP that we're reporting an event for has
2123 hit a GDB breakpoint (as opposed to some random trap signal),
2124 then just arrange for it to hit it again later. We don't keep
2125 the SIGTRAP status and don't forward the SIGTRAP signal to the
2126 LWP. We will handle the current event, eventually we will resume
2127 all LWPs, and this one will get its breakpoint trap again.
2129 If we do not do this, then we run the risk that the user will
2130 delete or disable the breakpoint, but the LWP will have already
2133 if (thread
->last_resume_kind
!= resume_stop
2134 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2135 && lp
->status_pending_p
2136 && WIFSTOPPED (lp
->status_pending
)
2137 && WSTOPSIG (lp
->status_pending
) == SIGTRAP
2139 && !lp
->stopped_by_watchpoint
2140 && cancel_breakpoint (lp
))
2141 /* Throw away the SIGTRAP. */
2142 lp
->status_pending_p
= 0;
2148 linux_cancel_breakpoints (void)
2150 find_inferior (&all_lwps
, cancel_breakpoints_callback
, NULL
);
2153 /* Select one LWP out of those that have events pending. */
2156 select_event_lwp (struct lwp_info
**orig_lp
)
2159 int random_selector
;
2160 struct lwp_info
*event_lp
;
2162 /* Give preference to any LWP that is being single-stepped. */
2164 = (struct lwp_info
*) find_inferior (&all_lwps
,
2165 select_singlestep_lwp_callback
, NULL
);
2166 if (event_lp
!= NULL
)
2170 "SEL: Select single-step %s\n",
2171 target_pid_to_str (ptid_of (event_lp
)));
2175 /* No single-stepping LWP. Select one at random, out of those
2176 which have had SIGTRAP events. */
2178 /* First see how many SIGTRAP events we have. */
2179 find_inferior (&all_lwps
, count_events_callback
, &num_events
);
2181 /* Now randomly pick a LWP out of those that have had a SIGTRAP. */
2182 random_selector
= (int)
2183 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2185 if (debug_threads
&& num_events
> 1)
2187 "SEL: Found %d SIGTRAP events, selecting #%d\n",
2188 num_events
, random_selector
);
2190 event_lp
= (struct lwp_info
*) find_inferior (&all_lwps
,
2191 select_event_lwp_callback
,
2195 if (event_lp
!= NULL
)
2197 /* Switch the event LWP. */
2198 *orig_lp
= event_lp
;
2202 /* Decrement the suspend count of an LWP. */
2205 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2207 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2209 /* Ignore EXCEPT. */
2215 gdb_assert (lwp
->suspended
>= 0);
2219 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2223 unsuspend_all_lwps (struct lwp_info
*except
)
2225 find_inferior (&all_lwps
, unsuspend_one_lwp
, except
);
2228 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2229 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2231 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2232 static ptid_t
linux_wait_1 (ptid_t ptid
,
2233 struct target_waitstatus
*ourstatus
,
2234 int target_options
);
2236 /* Stabilize threads (move out of jump pads).
2238 If a thread is midway collecting a fast tracepoint, we need to
2239 finish the collection and move it out of the jump pad before
2240 reporting the signal.
2242 This avoids recursion while collecting (when a signal arrives
2243 midway, and the signal handler itself collects), which would trash
2244 the trace buffer. In case the user set a breakpoint in a signal
2245 handler, this avoids the backtrace showing the jump pad, etc..
2246 Most importantly, there are certain things we can't do safely if
2247 threads are stopped in a jump pad (or in its callee's). For
2250 - starting a new trace run. A thread still collecting the
2251 previous run, could trash the trace buffer when resumed. The trace
2252 buffer control structures would have been reset but the thread had
2253 no way to tell. The thread could even midway memcpy'ing to the
2254 buffer, which would mean that when resumed, it would clobber the
2255 trace buffer that had been set for a new run.
2257 - we can't rewrite/reuse the jump pads for new tracepoints
2258 safely. Say you do tstart while a thread is stopped midway while
2259 collecting. When the thread is later resumed, it finishes the
2260 collection, and returns to the jump pad, to execute the original
2261 instruction that was under the tracepoint jump at the time the
2262 older run had been started. If the jump pad had been rewritten
2263 since for something else in the new run, the thread would now
2264 execute the wrong / random instructions. */
2267 linux_stabilize_threads (void)
2269 struct thread_info
*save_inferior
;
2270 struct lwp_info
*lwp_stuck
;
2273 = (struct lwp_info
*) find_inferior (&all_lwps
,
2274 stuck_in_jump_pad_callback
, NULL
);
2275 if (lwp_stuck
!= NULL
)
2278 fprintf (stderr
, "can't stabilize, LWP %ld is stuck in jump pad\n",
2279 lwpid_of (lwp_stuck
));
2283 save_inferior
= current_inferior
;
2285 stabilizing_threads
= 1;
2288 for_each_inferior (&all_lwps
, move_out_of_jump_pad_callback
);
2290 /* Loop until all are stopped out of the jump pads. */
2291 while (find_inferior (&all_lwps
, lwp_running
, NULL
) != NULL
)
2293 struct target_waitstatus ourstatus
;
2294 struct lwp_info
*lwp
;
2297 /* Note that we go through the full wait even loop. While
2298 moving threads out of jump pad, we need to be able to step
2299 over internal breakpoints and such. */
2300 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2302 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2304 lwp
= get_thread_lwp (current_inferior
);
2309 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2310 || current_inferior
->last_resume_kind
== resume_stop
)
2312 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2313 enqueue_one_deferred_signal (lwp
, &wstat
);
2318 find_inferior (&all_lwps
, unsuspend_one_lwp
, NULL
);
2320 stabilizing_threads
= 0;
2322 current_inferior
= save_inferior
;
2327 = (struct lwp_info
*) find_inferior (&all_lwps
,
2328 stuck_in_jump_pad_callback
, NULL
);
2329 if (lwp_stuck
!= NULL
)
2330 fprintf (stderr
, "couldn't stabilize, LWP %ld got stuck in jump pad\n",
2331 lwpid_of (lwp_stuck
));
2335 /* Wait for process, returns status. */
2338 linux_wait_1 (ptid_t ptid
,
2339 struct target_waitstatus
*ourstatus
, int target_options
)
2342 struct lwp_info
*event_child
;
2345 int step_over_finished
;
2346 int bp_explains_trap
;
2347 int maybe_internal_trap
;
2352 /* Translate generic target options into linux options. */
2354 if (target_options
& TARGET_WNOHANG
)
2358 bp_explains_trap
= 0;
2361 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2363 /* If we were only supposed to resume one thread, only wait for
2364 that thread - if it's still alive. If it died, however - which
2365 can happen if we're coming from the thread death case below -
2366 then we need to make sure we restart the other threads. We could
2367 pick a thread at random or restart all; restarting all is less
2370 && !ptid_equal (cont_thread
, null_ptid
)
2371 && !ptid_equal (cont_thread
, minus_one_ptid
))
2373 struct thread_info
*thread
;
2375 thread
= (struct thread_info
*) find_inferior_id (&all_threads
,
2378 /* No stepping, no signal - unless one is pending already, of course. */
2381 struct thread_resume resume_info
;
2382 resume_info
.thread
= minus_one_ptid
;
2383 resume_info
.kind
= resume_continue
;
2384 resume_info
.sig
= 0;
2385 linux_resume (&resume_info
, 1);
2391 if (ptid_equal (step_over_bkpt
, null_ptid
))
2392 pid
= linux_wait_for_event (ptid
, &w
, options
);
2396 fprintf (stderr
, "step_over_bkpt set [%s], doing a blocking wait\n",
2397 target_pid_to_str (step_over_bkpt
));
2398 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2401 if (pid
== 0) /* only if TARGET_WNOHANG */
2404 event_child
= get_thread_lwp (current_inferior
);
2406 /* If we are waiting for a particular child, and it exited,
2407 linux_wait_for_event will return its exit status. Similarly if
2408 the last child exited. If this is not the last child, however,
2409 do not report it as exited until there is a 'thread exited' response
2410 available in the remote protocol. Instead, just wait for another event.
2411 This should be safe, because if the thread crashed we will already
2412 have reported the termination signal to GDB; that should stop any
2413 in-progress stepping operations, etc.
2415 Report the exit status of the last thread to exit. This matches
2416 LinuxThreads' behavior. */
2418 if (last_thread_of_process_p (current_inferior
))
2420 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2424 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2425 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2429 "\nChild exited with retcode = %x \n",
2434 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2435 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2439 "\nChild terminated with signal = %x \n",
2444 return ptid_of (event_child
);
2449 if (!WIFSTOPPED (w
))
2453 /* If this event was not handled before, and is not a SIGTRAP, we
2454 report it. SIGILL and SIGSEGV are also treated as traps in case
2455 a breakpoint is inserted at the current PC. If this target does
2456 not support internal breakpoints at all, we also report the
2457 SIGTRAP without further processing; it's of no concern to us. */
2459 = (supports_breakpoints ()
2460 && (WSTOPSIG (w
) == SIGTRAP
2461 || ((WSTOPSIG (w
) == SIGILL
2462 || WSTOPSIG (w
) == SIGSEGV
)
2463 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2465 if (maybe_internal_trap
)
2467 /* Handle anything that requires bookkeeping before deciding to
2468 report the event or continue waiting. */
2470 /* First check if we can explain the SIGTRAP with an internal
2471 breakpoint, or if we should possibly report the event to GDB.
2472 Do this before anything that may remove or insert a
2474 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2476 /* We have a SIGTRAP, possibly a step-over dance has just
2477 finished. If so, tweak the state machine accordingly,
2478 reinsert breakpoints and delete any reinsert (software
2479 single-step) breakpoints. */
2480 step_over_finished
= finish_step_over (event_child
);
2482 /* Now invoke the callbacks of any internal breakpoints there. */
2483 check_breakpoints (event_child
->stop_pc
);
2485 /* Handle tracepoint data collecting. This may overflow the
2486 trace buffer, and cause a tracing stop, removing
2488 trace_event
= handle_tracepoints (event_child
);
2490 if (bp_explains_trap
)
2492 /* If we stepped or ran into an internal breakpoint, we've
2493 already handled it. So next time we resume (from this
2494 PC), we should step over it. */
2496 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2498 if (breakpoint_here (event_child
->stop_pc
))
2499 event_child
->need_step_over
= 1;
2504 /* We have some other signal, possibly a step-over dance was in
2505 progress, and it should be cancelled too. */
2506 step_over_finished
= finish_step_over (event_child
);
2509 /* We have all the data we need. Either report the event to GDB, or
2510 resume threads and keep waiting for more. */
2512 /* If we're collecting a fast tracepoint, finish the collection and
2513 move out of the jump pad before delivering a signal. See
2514 linux_stabilize_threads. */
2517 && WSTOPSIG (w
) != SIGTRAP
2518 && supports_fast_tracepoints ()
2519 && agent_loaded_p ())
2523 "Got signal %d for LWP %ld. Check if we need "
2524 "to defer or adjust it.\n",
2525 WSTOPSIG (w
), lwpid_of (event_child
));
2527 /* Allow debugging the jump pad itself. */
2528 if (current_inferior
->last_resume_kind
!= resume_step
2529 && maybe_move_out_of_jump_pad (event_child
, &w
))
2531 enqueue_one_deferred_signal (event_child
, &w
);
2535 "Signal %d for LWP %ld deferred (in jump pad)\n",
2536 WSTOPSIG (w
), lwpid_of (event_child
));
2538 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2543 if (event_child
->collecting_fast_tracepoint
)
2547 LWP %ld was trying to move out of the jump pad (%d). \
2548 Check if we're already there.\n",
2549 lwpid_of (event_child
),
2550 event_child
->collecting_fast_tracepoint
);
2554 event_child
->collecting_fast_tracepoint
2555 = linux_fast_tracepoint_collecting (event_child
, NULL
);
2557 if (event_child
->collecting_fast_tracepoint
!= 1)
2559 /* No longer need this breakpoint. */
2560 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
2564 "No longer need exit-jump-pad bkpt; removing it."
2565 "stopping all threads momentarily.\n");
2567 /* Other running threads could hit this breakpoint.
2568 We don't handle moribund locations like GDB does,
2569 instead we always pause all threads when removing
2570 breakpoints, so that any step-over or
2571 decr_pc_after_break adjustment is always taken
2572 care of while the breakpoint is still
2574 stop_all_lwps (1, event_child
);
2575 cancel_breakpoints ();
2577 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
2578 event_child
->exit_jump_pad_bkpt
= NULL
;
2580 unstop_all_lwps (1, event_child
);
2582 gdb_assert (event_child
->suspended
>= 0);
2586 if (event_child
->collecting_fast_tracepoint
== 0)
2590 "fast tracepoint finished "
2591 "collecting successfully.\n");
2593 /* We may have a deferred signal to report. */
2594 if (dequeue_one_deferred_signal (event_child
, &w
))
2597 fprintf (stderr
, "dequeued one signal.\n");
2602 fprintf (stderr
, "no deferred signals.\n");
2604 if (stabilizing_threads
)
2606 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2607 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2608 return ptid_of (event_child
);
2614 /* Check whether GDB would be interested in this event. */
2616 /* If GDB is not interested in this signal, don't stop other
2617 threads, and don't report it to GDB. Just resume the inferior
2618 right away. We do this for threading-related signals as well as
2619 any that GDB specifically requested we ignore. But never ignore
2620 SIGSTOP if we sent it ourselves, and do not ignore signals when
2621 stepping - they may require special handling to skip the signal
2623 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
2626 && current_inferior
->last_resume_kind
!= resume_step
2628 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
2629 (current_process ()->private->thread_db
!= NULL
2630 && (WSTOPSIG (w
) == __SIGRTMIN
2631 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
2634 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
2635 && !(WSTOPSIG (w
) == SIGSTOP
2636 && current_inferior
->last_resume_kind
== resume_stop
))))
2638 siginfo_t info
, *info_p
;
2641 fprintf (stderr
, "Ignored signal %d for LWP %ld.\n",
2642 WSTOPSIG (w
), lwpid_of (event_child
));
2644 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (event_child
),
2645 (PTRACE_ARG3_TYPE
) 0, &info
) == 0)
2649 linux_resume_one_lwp (event_child
, event_child
->stepping
,
2650 WSTOPSIG (w
), info_p
);
2654 /* Note that all addresses are always "out of the step range" when
2655 there's no range to begin with. */
2656 in_step_range
= lwp_in_step_range (event_child
);
2658 /* If GDB wanted this thread to single step, and the thread is out
2659 of the step range, we always want to report the SIGTRAP, and let
2660 GDB handle it. Watchpoints should always be reported. So should
2661 signals we can't explain. A SIGTRAP we can't explain could be a
2662 GDB breakpoint --- we may or not support Z0 breakpoints. If we
2663 do, we're be able to handle GDB breakpoints on top of internal
2664 breakpoints, by handling the internal breakpoint and still
2665 reporting the event to GDB. If we don't, we're out of luck, GDB
2666 won't see the breakpoint hit. */
2667 report_to_gdb
= (!maybe_internal_trap
2668 || (current_inferior
->last_resume_kind
== resume_step
2670 || event_child
->stopped_by_watchpoint
2671 || (!step_over_finished
&& !in_step_range
2672 && !bp_explains_trap
&& !trace_event
)
2673 || (gdb_breakpoint_here (event_child
->stop_pc
)
2674 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
2675 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
)));
2677 run_breakpoint_commands (event_child
->stop_pc
);
2679 /* We found no reason GDB would want us to stop. We either hit one
2680 of our own breakpoints, or finished an internal step GDB
2681 shouldn't know about. */
2686 if (bp_explains_trap
)
2687 fprintf (stderr
, "Hit a gdbserver breakpoint.\n");
2688 if (step_over_finished
)
2689 fprintf (stderr
, "Step-over finished.\n");
2691 fprintf (stderr
, "Tracepoint event.\n");
2692 if (lwp_in_step_range (event_child
))
2693 fprintf (stderr
, "Range stepping pc 0x%s [0x%s, 0x%s).\n",
2694 paddress (event_child
->stop_pc
),
2695 paddress (event_child
->step_range_start
),
2696 paddress (event_child
->step_range_end
));
2699 /* We're not reporting this breakpoint to GDB, so apply the
2700 decr_pc_after_break adjustment to the inferior's regcache
2703 if (the_low_target
.set_pc
!= NULL
)
2705 struct regcache
*regcache
2706 = get_thread_regcache (get_lwp_thread (event_child
), 1);
2707 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2710 /* We may have finished stepping over a breakpoint. If so,
2711 we've stopped and suspended all LWPs momentarily except the
2712 stepping one. This is where we resume them all again. We're
2713 going to keep waiting, so use proceed, which handles stepping
2714 over the next breakpoint. */
2716 fprintf (stderr
, "proceeding all threads.\n");
2718 if (step_over_finished
)
2719 unsuspend_all_lwps (event_child
);
2721 proceed_all_lwps ();
2727 if (current_inferior
->last_resume_kind
== resume_step
)
2729 if (event_child
->step_range_start
== event_child
->step_range_end
)
2730 fprintf (stderr
, "GDB wanted to single-step, reporting event.\n");
2731 else if (!lwp_in_step_range (event_child
))
2732 fprintf (stderr
, "Out of step range, reporting event.\n");
2734 if (event_child
->stopped_by_watchpoint
)
2735 fprintf (stderr
, "Stopped by watchpoint.\n");
2736 if (gdb_breakpoint_here (event_child
->stop_pc
))
2737 fprintf (stderr
, "Stopped by GDB breakpoint.\n");
2739 fprintf (stderr
, "Hit a non-gdbserver trap event.\n");
2742 /* Alright, we're going to report a stop. */
2744 if (!non_stop
&& !stabilizing_threads
)
2746 /* In all-stop, stop all threads. */
2747 stop_all_lwps (0, NULL
);
2749 /* If we're not waiting for a specific LWP, choose an event LWP
2750 from among those that have had events. Giving equal priority
2751 to all LWPs that have had events helps prevent
2753 if (ptid_equal (ptid
, minus_one_ptid
))
2755 event_child
->status_pending_p
= 1;
2756 event_child
->status_pending
= w
;
2758 select_event_lwp (&event_child
);
2760 event_child
->status_pending_p
= 0;
2761 w
= event_child
->status_pending
;
2764 /* Now that we've selected our final event LWP, cancel any
2765 breakpoints in other LWPs that have hit a GDB breakpoint.
2766 See the comment in cancel_breakpoints_callback to find out
2768 find_inferior (&all_lwps
, cancel_breakpoints_callback
, event_child
);
2770 /* If we were going a step-over, all other threads but the stepping one
2771 had been paused in start_step_over, with their suspend counts
2772 incremented. We don't want to do a full unstop/unpause, because we're
2773 in all-stop mode (so we want threads stopped), but we still need to
2774 unsuspend the other threads, to decrement their `suspended' count
2776 if (step_over_finished
)
2777 unsuspend_all_lwps (event_child
);
2779 /* Stabilize threads (move out of jump pads). */
2780 stabilize_threads ();
2784 /* If we just finished a step-over, then all threads had been
2785 momentarily paused. In all-stop, that's fine, we want
2786 threads stopped by now anyway. In non-stop, we need to
2787 re-resume threads that GDB wanted to be running. */
2788 if (step_over_finished
)
2789 unstop_all_lwps (1, event_child
);
2792 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
2794 if (current_inferior
->last_resume_kind
== resume_stop
2795 && WSTOPSIG (w
) == SIGSTOP
)
2797 /* A thread that has been requested to stop by GDB with vCont;t,
2798 and it stopped cleanly, so report as SIG0. The use of
2799 SIGSTOP is an implementation detail. */
2800 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
2802 else if (current_inferior
->last_resume_kind
== resume_stop
2803 && WSTOPSIG (w
) != SIGSTOP
)
2805 /* A thread that has been requested to stop by GDB with vCont;t,
2806 but, it stopped for other reasons. */
2807 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2811 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
2814 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
2817 fprintf (stderr
, "linux_wait ret = %s, %d, %d\n",
2818 target_pid_to_str (ptid_of (event_child
)),
2820 ourstatus
->value
.sig
);
2822 return ptid_of (event_child
);
2825 /* Get rid of any pending event in the pipe. */
2827 async_file_flush (void)
2833 ret
= read (linux_event_pipe
[0], &buf
, 1);
2834 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
2837 /* Put something in the pipe, so the event loop wakes up. */
2839 async_file_mark (void)
2843 async_file_flush ();
2846 ret
= write (linux_event_pipe
[1], "+", 1);
2847 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
2849 /* Ignore EAGAIN. If the pipe is full, the event loop will already
2850 be awakened anyway. */
2854 linux_wait (ptid_t ptid
,
2855 struct target_waitstatus
*ourstatus
, int target_options
)
2860 fprintf (stderr
, "linux_wait: [%s]\n", target_pid_to_str (ptid
));
2862 /* Flush the async file first. */
2863 if (target_is_async_p ())
2864 async_file_flush ();
2866 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
2868 /* If at least one stop was reported, there may be more. A single
2869 SIGCHLD can signal more than one child stop. */
2870 if (target_is_async_p ()
2871 && (target_options
& TARGET_WNOHANG
) != 0
2872 && !ptid_equal (event_ptid
, null_ptid
))
2878 /* Send a signal to an LWP. */
2881 kill_lwp (unsigned long lwpid
, int signo
)
2883 /* Use tkill, if possible, in case we are using nptl threads. If tkill
2884 fails, then we are not using nptl threads and we should be using kill. */
2888 static int tkill_failed
;
2895 ret
= syscall (__NR_tkill
, lwpid
, signo
);
2896 if (errno
!= ENOSYS
)
2903 return kill (lwpid
, signo
);
2907 linux_stop_lwp (struct lwp_info
*lwp
)
2913 send_sigstop (struct lwp_info
*lwp
)
2917 pid
= lwpid_of (lwp
);
2919 /* If we already have a pending stop signal for this process, don't
2921 if (lwp
->stop_expected
)
2924 fprintf (stderr
, "Have pending sigstop for lwp %d\n", pid
);
2930 fprintf (stderr
, "Sending sigstop to lwp %d\n", pid
);
2932 lwp
->stop_expected
= 1;
2933 kill_lwp (pid
, SIGSTOP
);
2937 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
2939 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2941 /* Ignore EXCEPT. */
2952 /* Increment the suspend count of an LWP, and stop it, if not stopped
2955 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
2958 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2960 /* Ignore EXCEPT. */
2966 return send_sigstop_callback (entry
, except
);
2970 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
2972 /* It's dead, really. */
2975 /* Store the exit status for later. */
2976 lwp
->status_pending_p
= 1;
2977 lwp
->status_pending
= wstat
;
2979 /* Prevent trying to stop it. */
2982 /* No further stops are expected from a dead lwp. */
2983 lwp
->stop_expected
= 0;
2987 wait_for_sigstop (struct inferior_list_entry
*entry
)
2989 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
2990 struct thread_info
*saved_inferior
;
2999 fprintf (stderr
, "wait_for_sigstop: LWP %ld already stopped\n",
3004 saved_inferior
= current_inferior
;
3005 if (saved_inferior
!= NULL
)
3006 saved_tid
= ((struct inferior_list_entry
*) saved_inferior
)->id
;
3008 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3010 ptid
= lwp
->head
.id
;
3013 fprintf (stderr
, "wait_for_sigstop: pulling one event\n");
3015 pid
= linux_wait_for_event (ptid
, &wstat
, __WALL
);
3017 /* If we stopped with a non-SIGSTOP signal, save it for later
3018 and record the pending SIGSTOP. If the process exited, just
3020 if (WIFSTOPPED (wstat
))
3023 fprintf (stderr
, "LWP %ld stopped with signal %d\n",
3024 lwpid_of (lwp
), WSTOPSIG (wstat
));
3026 if (WSTOPSIG (wstat
) != SIGSTOP
)
3029 fprintf (stderr
, "LWP %ld stopped with non-sigstop status %06x\n",
3030 lwpid_of (lwp
), wstat
);
3032 lwp
->status_pending_p
= 1;
3033 lwp
->status_pending
= wstat
;
3039 fprintf (stderr
, "Process %d exited while stopping LWPs\n", pid
);
3041 lwp
= find_lwp_pid (pid_to_ptid (pid
));
3044 /* Leave this status pending for the next time we're able to
3045 report it. In the mean time, we'll report this lwp as
3046 dead to GDB, so GDB doesn't try to read registers and
3047 memory from it. This can only happen if this was the
3048 last thread of the process; otherwise, PID is removed
3049 from the thread tables before linux_wait_for_event
3051 mark_lwp_dead (lwp
, wstat
);
3055 if (saved_inferior
== NULL
|| linux_thread_alive (saved_tid
))
3056 current_inferior
= saved_inferior
;
3060 fprintf (stderr
, "Previously current thread died.\n");
3064 /* We can't change the current inferior behind GDB's back,
3065 otherwise, a subsequent command may apply to the wrong
3067 current_inferior
= NULL
;
3071 /* Set a valid thread as current. */
3072 set_desired_inferior (0);
3077 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3078 move it out, because we need to report the stop event to GDB. For
3079 example, if the user puts a breakpoint in the jump pad, it's
3080 because she wants to debug it. */
3083 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3085 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3086 struct thread_info
*thread
= get_lwp_thread (lwp
);
3088 gdb_assert (lwp
->suspended
== 0);
3089 gdb_assert (lwp
->stopped
);
3091 /* Allow debugging the jump pad, gdb_collect, etc.. */
3092 return (supports_fast_tracepoints ()
3093 && agent_loaded_p ()
3094 && (gdb_breakpoint_here (lwp
->stop_pc
)
3095 || lwp
->stopped_by_watchpoint
3096 || thread
->last_resume_kind
== resume_step
)
3097 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3101 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3103 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3104 struct thread_info
*thread
= get_lwp_thread (lwp
);
3107 gdb_assert (lwp
->suspended
== 0);
3108 gdb_assert (lwp
->stopped
);
3110 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3112 /* Allow debugging the jump pad, gdb_collect, etc. */
3113 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3114 && !lwp
->stopped_by_watchpoint
3115 && thread
->last_resume_kind
!= resume_step
3116 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3120 "LWP %ld needs stabilizing (in jump pad)\n",
3125 lwp
->status_pending_p
= 0;
3126 enqueue_one_deferred_signal (lwp
, wstat
);
3130 "Signal %d for LWP %ld deferred "
3132 WSTOPSIG (*wstat
), lwpid_of (lwp
));
3135 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3142 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3144 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3153 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3154 If SUSPEND, then also increase the suspend count of every LWP,
3158 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3160 /* Should not be called recursively. */
3161 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3163 stopping_threads
= (suspend
3164 ? STOPPING_AND_SUSPENDING_THREADS
3165 : STOPPING_THREADS
);
3168 find_inferior (&all_lwps
, suspend_and_send_sigstop_callback
, except
);
3170 find_inferior (&all_lwps
, send_sigstop_callback
, except
);
3171 for_each_inferior (&all_lwps
, wait_for_sigstop
);
3172 stopping_threads
= NOT_STOPPING_THREADS
;
3175 /* Resume execution of the inferior process.
3176 If STEP is nonzero, single-step it.
3177 If SIGNAL is nonzero, give it that signal. */
3180 linux_resume_one_lwp (struct lwp_info
*lwp
,
3181 int step
, int signal
, siginfo_t
*info
)
3183 struct thread_info
*saved_inferior
;
3184 int fast_tp_collecting
;
3186 if (lwp
->stopped
== 0)
3189 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3191 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3193 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3194 user used the "jump" command, or "set $pc = foo"). */
3195 if (lwp
->stop_pc
!= get_pc (lwp
))
3197 /* Collecting 'while-stepping' actions doesn't make sense
3199 release_while_stepping_state_list (get_lwp_thread (lwp
));
3202 /* If we have pending signals or status, and a new signal, enqueue the
3203 signal. Also enqueue the signal if we are waiting to reinsert a
3204 breakpoint; it will be picked up again below. */
3206 && (lwp
->status_pending_p
3207 || lwp
->pending_signals
!= NULL
3208 || lwp
->bp_reinsert
!= 0
3209 || fast_tp_collecting
))
3211 struct pending_signals
*p_sig
;
3212 p_sig
= xmalloc (sizeof (*p_sig
));
3213 p_sig
->prev
= lwp
->pending_signals
;
3214 p_sig
->signal
= signal
;
3216 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3218 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3219 lwp
->pending_signals
= p_sig
;
3222 if (lwp
->status_pending_p
)
3225 fprintf (stderr
, "Not resuming lwp %ld (%s, signal %d, stop %s);"
3226 " has pending status\n",
3227 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3228 lwp
->stop_expected
? "expected" : "not expected");
3232 saved_inferior
= current_inferior
;
3233 current_inferior
= get_lwp_thread (lwp
);
3236 fprintf (stderr
, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
3237 lwpid_of (lwp
), step
? "step" : "continue", signal
,
3238 lwp
->stop_expected
? "expected" : "not expected");
3240 /* This bit needs some thinking about. If we get a signal that
3241 we must report while a single-step reinsert is still pending,
3242 we often end up resuming the thread. It might be better to
3243 (ew) allow a stack of pending events; then we could be sure that
3244 the reinsert happened right away and not lose any signals.
3246 Making this stack would also shrink the window in which breakpoints are
3247 uninserted (see comment in linux_wait_for_lwp) but not enough for
3248 complete correctness, so it won't solve that problem. It may be
3249 worthwhile just to solve this one, however. */
3250 if (lwp
->bp_reinsert
!= 0)
3253 fprintf (stderr
, " pending reinsert at 0x%s\n",
3254 paddress (lwp
->bp_reinsert
));
3256 if (can_hardware_single_step ())
3258 if (fast_tp_collecting
== 0)
3261 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3263 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3270 /* Postpone any pending signal. It was enqueued above. */
3274 if (fast_tp_collecting
== 1)
3278 lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n",
3281 /* Postpone any pending signal. It was enqueued above. */
3284 else if (fast_tp_collecting
== 2)
3288 lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n",
3291 if (can_hardware_single_step ())
3294 fatal ("moving out of jump pad single-stepping"
3295 " not implemented on this target");
3297 /* Postpone any pending signal. It was enqueued above. */
3301 /* If we have while-stepping actions in this thread set it stepping.
3302 If we have a signal to deliver, it may or may not be set to
3303 SIG_IGN, we don't know. Assume so, and allow collecting
3304 while-stepping into a signal handler. A possible smart thing to
3305 do would be to set an internal breakpoint at the signal return
3306 address, continue, and carry on catching this while-stepping
3307 action only when that breakpoint is hit. A future
3309 if (get_lwp_thread (lwp
)->while_stepping
!= NULL
3310 && can_hardware_single_step ())
3314 "lwp %ld has a while-stepping action -> forcing step.\n",
3319 if (debug_threads
&& the_low_target
.get_pc
!= NULL
)
3321 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
3322 CORE_ADDR pc
= (*the_low_target
.get_pc
) (regcache
);
3323 fprintf (stderr
, " resuming from pc 0x%lx\n", (long) pc
);
3326 /* If we have pending signals, consume one unless we are trying to
3327 reinsert a breakpoint or we're trying to finish a fast tracepoint
3329 if (lwp
->pending_signals
!= NULL
3330 && lwp
->bp_reinsert
== 0
3331 && fast_tp_collecting
== 0)
3333 struct pending_signals
**p_sig
;
3335 p_sig
= &lwp
->pending_signals
;
3336 while ((*p_sig
)->prev
!= NULL
)
3337 p_sig
= &(*p_sig
)->prev
;
3339 signal
= (*p_sig
)->signal
;
3340 if ((*p_sig
)->info
.si_signo
!= 0)
3341 ptrace (PTRACE_SETSIGINFO
, lwpid_of (lwp
), (PTRACE_ARG3_TYPE
) 0,
3348 if (the_low_target
.prepare_to_resume
!= NULL
)
3349 the_low_target
.prepare_to_resume (lwp
);
3351 regcache_invalidate_one ((struct inferior_list_entry
*)
3352 get_lwp_thread (lwp
));
3355 lwp
->stopped_by_watchpoint
= 0;
3356 lwp
->stepping
= step
;
3357 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (lwp
),
3358 (PTRACE_ARG3_TYPE
) 0,
3359 /* Coerce to a uintptr_t first to avoid potential gcc warning
3360 of coercing an 8 byte integer to a 4 byte pointer. */
3361 (PTRACE_ARG4_TYPE
) (uintptr_t) signal
);
3363 current_inferior
= saved_inferior
;
3366 /* ESRCH from ptrace either means that the thread was already
3367 running (an error) or that it is gone (a race condition). If
3368 it's gone, we will get a notification the next time we wait,
3369 so we can ignore the error. We could differentiate these
3370 two, but it's tricky without waiting; the thread still exists
3371 as a zombie, so sending it signal 0 would succeed. So just
3376 perror_with_name ("ptrace");
3380 struct thread_resume_array
3382 struct thread_resume
*resume
;
3386 /* This function is called once per thread. We look up the thread
3387 in RESUME_PTR, and mark the thread with a pointer to the appropriate
3390 This algorithm is O(threads * resume elements), but resume elements
3391 is small (and will remain small at least until GDB supports thread
3394 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3396 struct lwp_info
*lwp
;
3397 struct thread_info
*thread
;
3399 struct thread_resume_array
*r
;
3401 thread
= (struct thread_info
*) entry
;
3402 lwp
= get_thread_lwp (thread
);
3405 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3407 ptid_t ptid
= r
->resume
[ndx
].thread
;
3408 if (ptid_equal (ptid
, minus_one_ptid
)
3409 || ptid_equal (ptid
, entry
->id
)
3410 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3412 || (ptid_get_pid (ptid
) == pid_of (lwp
)
3413 && (ptid_is_pid (ptid
)
3414 || ptid_get_lwp (ptid
) == -1)))
3416 if (r
->resume
[ndx
].kind
== resume_stop
3417 && thread
->last_resume_kind
== resume_stop
)
3420 fprintf (stderr
, "already %s LWP %ld at GDB's request\n",
3421 thread
->last_status
.kind
== TARGET_WAITKIND_STOPPED
3429 lwp
->resume
= &r
->resume
[ndx
];
3430 thread
->last_resume_kind
= lwp
->resume
->kind
;
3432 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3433 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3435 /* If we had a deferred signal to report, dequeue one now.
3436 This can happen if LWP gets more than one signal while
3437 trying to get out of a jump pad. */
3439 && !lwp
->status_pending_p
3440 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3442 lwp
->status_pending_p
= 1;
3446 "Dequeueing deferred signal %d for LWP %ld, "
3447 "leaving status pending.\n",
3448 WSTOPSIG (lwp
->status_pending
), lwpid_of (lwp
));
3455 /* No resume action for this thread. */
3462 /* Set *FLAG_P if this lwp has an interesting status pending. */
3464 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
3466 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3468 /* LWPs which will not be resumed are not interesting, because
3469 we might not wait for them next time through linux_wait. */
3470 if (lwp
->resume
== NULL
)
3473 if (lwp
->status_pending_p
)
3474 * (int *) flag_p
= 1;
3479 /* Return 1 if this lwp that GDB wants running is stopped at an
3480 internal breakpoint that we need to step over. It assumes that any
3481 required STOP_PC adjustment has already been propagated to the
3482 inferior's regcache. */
3485 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
3487 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3488 struct thread_info
*thread
;
3489 struct thread_info
*saved_inferior
;
3492 /* LWPs which will not be resumed are not interesting, because we
3493 might not wait for them next time through linux_wait. */
3499 "Need step over [LWP %ld]? Ignoring, not stopped\n",
3504 thread
= get_lwp_thread (lwp
);
3506 if (thread
->last_resume_kind
== resume_stop
)
3510 "Need step over [LWP %ld]? Ignoring, should remain stopped\n",
3515 gdb_assert (lwp
->suspended
>= 0);
3521 "Need step over [LWP %ld]? Ignoring, suspended\n",
3526 if (!lwp
->need_step_over
)
3530 "Need step over [LWP %ld]? No\n", lwpid_of (lwp
));
3533 if (lwp
->status_pending_p
)
3537 "Need step over [LWP %ld]? Ignoring, has pending status.\n",
3542 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
3546 /* If the PC has changed since we stopped, then don't do anything,
3547 and let the breakpoint/tracepoint be hit. This happens if, for
3548 instance, GDB handled the decr_pc_after_break subtraction itself,
3549 GDB is OOL stepping this thread, or the user has issued a "jump"
3550 command, or poked thread's registers herself. */
3551 if (pc
!= lwp
->stop_pc
)
3555 "Need step over [LWP %ld]? Cancelling, PC was changed. "
3556 "Old stop_pc was 0x%s, PC is now 0x%s\n",
3557 lwpid_of (lwp
), paddress (lwp
->stop_pc
), paddress (pc
));
3559 lwp
->need_step_over
= 0;
3563 saved_inferior
= current_inferior
;
3564 current_inferior
= thread
;
3566 /* We can only step over breakpoints we know about. */
3567 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
3569 /* Don't step over a breakpoint that GDB expects to hit
3570 though. If the condition is being evaluated on the target's side
3571 and it evaluate to false, step over this breakpoint as well. */
3572 if (gdb_breakpoint_here (pc
)
3573 && gdb_condition_true_at_breakpoint (pc
)
3574 && gdb_no_commands_at_breakpoint (pc
))
3578 "Need step over [LWP %ld]? yes, but found"
3579 " GDB breakpoint at 0x%s; skipping step over\n",
3580 lwpid_of (lwp
), paddress (pc
));
3582 current_inferior
= saved_inferior
;
3589 "Need step over [LWP %ld]? yes, "
3590 "found breakpoint at 0x%s\n",
3591 lwpid_of (lwp
), paddress (pc
));
3593 /* We've found an lwp that needs stepping over --- return 1 so
3594 that find_inferior stops looking. */
3595 current_inferior
= saved_inferior
;
3597 /* If the step over is cancelled, this is set again. */
3598 lwp
->need_step_over
= 0;
3603 current_inferior
= saved_inferior
;
3607 "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n",
3608 lwpid_of (lwp
), paddress (pc
));
3613 /* Start a step-over operation on LWP. When LWP stopped at a
3614 breakpoint, to make progress, we need to remove the breakpoint out
3615 of the way. If we let other threads run while we do that, they may
3616 pass by the breakpoint location and miss hitting it. To avoid
3617 that, a step-over momentarily stops all threads while LWP is
3618 single-stepped while the breakpoint is temporarily uninserted from
3619 the inferior. When the single-step finishes, we reinsert the
3620 breakpoint, and let all threads that are supposed to be running,
3623 On targets that don't support hardware single-step, we don't
3624 currently support full software single-stepping. Instead, we only
3625 support stepping over the thread event breakpoint, by asking the
3626 low target where to place a reinsert breakpoint. Since this
3627 routine assumes the breakpoint being stepped over is a thread event
3628 breakpoint, it usually assumes the return address of the current
3629 function is a good enough place to set the reinsert breakpoint. */
3632 start_step_over (struct lwp_info
*lwp
)
3634 struct thread_info
*saved_inferior
;
3640 "Starting step-over on LWP %ld. Stopping all threads\n",
3643 stop_all_lwps (1, lwp
);
3644 gdb_assert (lwp
->suspended
== 0);
3647 fprintf (stderr
, "Done stopping all threads for step-over.\n");
3649 /* Note, we should always reach here with an already adjusted PC,
3650 either by GDB (if we're resuming due to GDB's request), or by our
3651 caller, if we just finished handling an internal breakpoint GDB
3652 shouldn't care about. */
3655 saved_inferior
= current_inferior
;
3656 current_inferior
= get_lwp_thread (lwp
);
3658 lwp
->bp_reinsert
= pc
;
3659 uninsert_breakpoints_at (pc
);
3660 uninsert_fast_tracepoint_jumps_at (pc
);
3662 if (can_hardware_single_step ())
3668 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
3669 set_reinsert_breakpoint (raddr
);
3673 current_inferior
= saved_inferior
;
3675 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3677 /* Require next event from this LWP. */
3678 step_over_bkpt
= lwp
->head
.id
;
3682 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
3683 start_step_over, if still there, and delete any reinsert
3684 breakpoints we've set, on non hardware single-step targets. */
3687 finish_step_over (struct lwp_info
*lwp
)
3689 if (lwp
->bp_reinsert
!= 0)
3692 fprintf (stderr
, "Finished step over.\n");
3694 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
3695 may be no breakpoint to reinsert there by now. */
3696 reinsert_breakpoints_at (lwp
->bp_reinsert
);
3697 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
3699 lwp
->bp_reinsert
= 0;
3701 /* Delete any software-single-step reinsert breakpoints. No
3702 longer needed. We don't have to worry about other threads
3703 hitting this trap, and later not being able to explain it,
3704 because we were stepping over a breakpoint, and we hold all
3705 threads but LWP stopped while doing that. */
3706 if (!can_hardware_single_step ())
3707 delete_reinsert_breakpoints ();
3709 step_over_bkpt
= null_ptid
;
3716 /* This function is called once per thread. We check the thread's resume
3717 request, which will tell us whether to resume, step, or leave the thread
3718 stopped; and what signal, if any, it should be sent.
3720 For threads which we aren't explicitly told otherwise, we preserve
3721 the stepping flag; this is used for stepping over gdbserver-placed
3724 If pending_flags was set in any thread, we queue any needed
3725 signals, since we won't actually resume. We already have a pending
3726 event to report, so we don't need to preserve any step requests;
3727 they should be re-issued if necessary. */
3730 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
3732 struct lwp_info
*lwp
;
3733 struct thread_info
*thread
;
3735 int leave_all_stopped
= * (int *) arg
;
3738 thread
= (struct thread_info
*) entry
;
3739 lwp
= get_thread_lwp (thread
);
3741 if (lwp
->resume
== NULL
)
3744 if (lwp
->resume
->kind
== resume_stop
)
3747 fprintf (stderr
, "resume_stop request for LWP %ld\n", lwpid_of (lwp
));
3752 fprintf (stderr
, "stopping LWP %ld\n", lwpid_of (lwp
));
3754 /* Stop the thread, and wait for the event asynchronously,
3755 through the event loop. */
3761 fprintf (stderr
, "already stopped LWP %ld\n",
3764 /* The LWP may have been stopped in an internal event that
3765 was not meant to be notified back to GDB (e.g., gdbserver
3766 breakpoint), so we should be reporting a stop event in
3769 /* If the thread already has a pending SIGSTOP, this is a
3770 no-op. Otherwise, something later will presumably resume
3771 the thread and this will cause it to cancel any pending
3772 operation, due to last_resume_kind == resume_stop. If
3773 the thread already has a pending status to report, we
3774 will still report it the next time we wait - see
3775 status_pending_p_callback. */
3777 /* If we already have a pending signal to report, then
3778 there's no need to queue a SIGSTOP, as this means we're
3779 midway through moving the LWP out of the jumppad, and we
3780 will report the pending signal as soon as that is
3782 if (lwp
->pending_signals_to_report
== NULL
)
3786 /* For stop requests, we're done. */
3788 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3792 /* If this thread which is about to be resumed has a pending status,
3793 then don't resume any threads - we can just report the pending
3794 status. Make sure to queue any signals that would otherwise be
3795 sent. In all-stop mode, we do this decision based on if *any*
3796 thread has a pending status. If there's a thread that needs the
3797 step-over-breakpoint dance, then don't resume any other thread
3798 but that particular one. */
3799 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
3804 fprintf (stderr
, "resuming LWP %ld\n", lwpid_of (lwp
));
3806 step
= (lwp
->resume
->kind
== resume_step
);
3807 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
3812 fprintf (stderr
, "leaving LWP %ld stopped\n", lwpid_of (lwp
));
3814 /* If we have a new signal, enqueue the signal. */
3815 if (lwp
->resume
->sig
!= 0)
3817 struct pending_signals
*p_sig
;
3818 p_sig
= xmalloc (sizeof (*p_sig
));
3819 p_sig
->prev
= lwp
->pending_signals
;
3820 p_sig
->signal
= lwp
->resume
->sig
;
3821 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3823 /* If this is the same signal we were previously stopped by,
3824 make sure to queue its siginfo. We can ignore the return
3825 value of ptrace; if it fails, we'll skip
3826 PTRACE_SETSIGINFO. */
3827 if (WIFSTOPPED (lwp
->last_status
)
3828 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
3829 ptrace (PTRACE_GETSIGINFO
, lwpid_of (lwp
), (PTRACE_ARG3_TYPE
) 0,
3832 lwp
->pending_signals
= p_sig
;
3836 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
3842 linux_resume (struct thread_resume
*resume_info
, size_t n
)
3844 struct thread_resume_array array
= { resume_info
, n
};
3845 struct lwp_info
*need_step_over
= NULL
;
3847 int leave_all_stopped
;
3849 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
3851 /* If there is a thread which would otherwise be resumed, which has
3852 a pending status, then don't resume any threads - we can just
3853 report the pending status. Make sure to queue any signals that
3854 would otherwise be sent. In non-stop mode, we'll apply this
3855 logic to each thread individually. We consume all pending events
3856 before considering to start a step-over (in all-stop). */
3859 find_inferior (&all_lwps
, resume_status_pending_p
, &any_pending
);
3861 /* If there is a thread which would otherwise be resumed, which is
3862 stopped at a breakpoint that needs stepping over, then don't
3863 resume any threads - have it step over the breakpoint with all
3864 other threads stopped, then resume all threads again. Make sure
3865 to queue any signals that would otherwise be delivered or
3867 if (!any_pending
&& supports_breakpoints ())
3869 = (struct lwp_info
*) find_inferior (&all_lwps
,
3870 need_step_over_p
, NULL
);
3872 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
3876 if (need_step_over
!= NULL
)
3877 fprintf (stderr
, "Not resuming all, need step over\n");
3878 else if (any_pending
)
3880 "Not resuming, all-stop and found "
3881 "an LWP with pending status\n");
3883 fprintf (stderr
, "Resuming, no pending status or step over needed\n");
3886 /* Even if we're leaving threads stopped, queue all signals we'd
3887 otherwise deliver. */
3888 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
3891 start_step_over (need_step_over
);
3894 /* This function is called once per thread. We check the thread's
3895 last resume request, which will tell us whether to resume, step, or
3896 leave the thread stopped. Any signal the client requested to be
3897 delivered has already been enqueued at this point.
3899 If any thread that GDB wants running is stopped at an internal
3900 breakpoint that needs stepping over, we start a step-over operation
3901 on that particular thread, and leave all others stopped. */
3904 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3906 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3907 struct thread_info
*thread
;
3915 "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp
));
3920 fprintf (stderr
, " LWP %ld already running\n", lwpid_of (lwp
));
3924 thread
= get_lwp_thread (lwp
);
3926 if (thread
->last_resume_kind
== resume_stop
3927 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
3930 fprintf (stderr
, " client wants LWP to remain %ld stopped\n",
3935 if (lwp
->status_pending_p
)
3938 fprintf (stderr
, " LWP %ld has pending status, leaving stopped\n",
3943 gdb_assert (lwp
->suspended
>= 0);
3948 fprintf (stderr
, " LWP %ld is suspended\n", lwpid_of (lwp
));
3952 if (thread
->last_resume_kind
== resume_stop
3953 && lwp
->pending_signals_to_report
== NULL
3954 && lwp
->collecting_fast_tracepoint
== 0)
3956 /* We haven't reported this LWP as stopped yet (otherwise, the
3957 last_status.kind check above would catch it, and we wouldn't
3958 reach here. This LWP may have been momentarily paused by a
3959 stop_all_lwps call while handling for example, another LWP's
3960 step-over. In that case, the pending expected SIGSTOP signal
3961 that was queued at vCont;t handling time will have already
3962 been consumed by wait_for_sigstop, and so we need to requeue
3963 another one here. Note that if the LWP already has a SIGSTOP
3964 pending, this is a no-op. */
3968 "Client wants LWP %ld to stop. "
3969 "Making sure it has a SIGSTOP pending\n",
3975 step
= thread
->last_resume_kind
== resume_step
;
3976 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
3981 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
3983 struct lwp_info
*lwp
= (struct lwp_info
*) entry
;
3989 gdb_assert (lwp
->suspended
>= 0);
3991 return proceed_one_lwp (entry
, except
);
3994 /* When we finish a step-over, set threads running again. If there's
3995 another thread that may need a step-over, now's the time to start
3996 it. Eventually, we'll move all threads past their breakpoints. */
3999 proceed_all_lwps (void)
4001 struct lwp_info
*need_step_over
;
4003 /* If there is a thread which would otherwise be resumed, which is
4004 stopped at a breakpoint that needs stepping over, then don't
4005 resume any threads - have it step over the breakpoint with all
4006 other threads stopped, then resume all threads again. */
4008 if (supports_breakpoints ())
4011 = (struct lwp_info
*) find_inferior (&all_lwps
,
4012 need_step_over_p
, NULL
);
4014 if (need_step_over
!= NULL
)
4017 fprintf (stderr
, "proceed_all_lwps: found "
4018 "thread %ld needing a step-over\n",
4019 lwpid_of (need_step_over
));
4021 start_step_over (need_step_over
);
4027 fprintf (stderr
, "Proceeding, no step-over needed\n");
4029 find_inferior (&all_lwps
, proceed_one_lwp
, NULL
);
4032 /* Stopped LWPs that the client wanted to be running, that don't have
4033 pending statuses, are set to run again, except for EXCEPT, if not
4034 NULL. This undoes a stop_all_lwps call. */
4037 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4043 "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except
));
4046 "unstopping all lwps\n");
4050 find_inferior (&all_lwps
, unsuspend_and_proceed_one_lwp
, except
);
4052 find_inferior (&all_lwps
, proceed_one_lwp
, except
);
4056 #ifdef HAVE_LINUX_REGSETS
4058 #define use_linux_regsets 1
4061 regsets_fetch_inferior_registers (struct regcache
*regcache
)
4063 struct regset_info
*regset
;
4064 int saw_general_regs
= 0;
4068 regset
= target_regsets
;
4070 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4071 while (regset
->size
>= 0)
4076 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
4082 buf
= xmalloc (regset
->size
);
4084 nt_type
= regset
->nt_type
;
4088 iov
.iov_len
= regset
->size
;
4089 data
= (void *) &iov
;
4095 res
= ptrace (regset
->get_request
, pid
,
4096 (PTRACE_ARG3_TYPE
) (long) nt_type
, data
);
4098 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4104 /* If we get EIO on a regset, do not try it again for
4106 disabled_regsets
[regset
- target_regsets
] = 1;
4113 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4118 else if (regset
->type
== GENERAL_REGS
)
4119 saw_general_regs
= 1;
4120 regset
->store_function (regcache
, buf
);
4124 if (saw_general_regs
)
4131 regsets_store_inferior_registers (struct regcache
*regcache
)
4133 struct regset_info
*regset
;
4134 int saw_general_regs
= 0;
4138 regset
= target_regsets
;
4140 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4141 while (regset
->size
>= 0)
4146 if (regset
->size
== 0 || disabled_regsets
[regset
- target_regsets
])
4152 buf
= xmalloc (regset
->size
);
4154 /* First fill the buffer with the current register set contents,
4155 in case there are any items in the kernel's regset that are
4156 not in gdbserver's regcache. */
4158 nt_type
= regset
->nt_type
;
4162 iov
.iov_len
= regset
->size
;
4163 data
= (void *) &iov
;
4169 res
= ptrace (regset
->get_request
, pid
,
4170 (PTRACE_ARG3_TYPE
) (long) nt_type
, data
);
4172 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4177 /* Then overlay our cached registers on that. */
4178 regset
->fill_function (regcache
, buf
);
4180 /* Only now do we write the register set. */
4182 res
= ptrace (regset
->set_request
, pid
,
4183 (PTRACE_ARG3_TYPE
) (long) nt_type
, data
);
4185 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4193 /* If we get EIO on a regset, do not try it again for
4195 disabled_regsets
[regset
- target_regsets
] = 1;
4199 else if (errno
== ESRCH
)
4201 /* At this point, ESRCH should mean the process is
4202 already gone, in which case we simply ignore attempts
4203 to change its registers. See also the related
4204 comment in linux_resume_one_lwp. */
4210 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4213 else if (regset
->type
== GENERAL_REGS
)
4214 saw_general_regs
= 1;
4218 if (saw_general_regs
)
4224 #else /* !HAVE_LINUX_REGSETS */
4226 #define use_linux_regsets 0
4227 #define regsets_fetch_inferior_registers(regcache) 1
4228 #define regsets_store_inferior_registers(regcache) 1
4232 /* Return 1 if register REGNO is supported by one of the regset ptrace
4233 calls or 0 if it has to be transferred individually. */
4236 linux_register_in_regsets (int regno
)
4238 unsigned char mask
= 1 << (regno
% 8);
4239 size_t index
= regno
/ 8;
4241 return (use_linux_regsets
4242 && (the_low_target
.regset_bitmap
== NULL
4243 || (the_low_target
.regset_bitmap
[index
] & mask
) != 0));
4246 #ifdef HAVE_LINUX_USRREGS
4249 register_addr (int regnum
)
4253 if (regnum
< 0 || regnum
>= the_low_target
.num_regs
)
4254 error ("Invalid register number %d.", regnum
);
4256 addr
= the_low_target
.regmap
[regnum
];
4261 /* Fetch one register. */
4263 fetch_register (struct regcache
*regcache
, int regno
)
4270 if (regno
>= the_low_target
.num_regs
)
4272 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4275 regaddr
= register_addr (regno
);
4279 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4280 & -sizeof (PTRACE_XFER_TYPE
));
4281 buf
= alloca (size
);
4283 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4284 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4287 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4288 ptrace (PTRACE_PEEKUSER
, pid
,
4289 /* Coerce to a uintptr_t first to avoid potential gcc warning
4290 of coercing an 8 byte integer to a 4 byte pointer. */
4291 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
, (PTRACE_ARG4_TYPE
) 0);
4292 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4294 error ("reading register %d: %s", regno
, strerror (errno
));
4297 if (the_low_target
.supply_ptrace_register
)
4298 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4300 supply_register (regcache
, regno
, buf
);
4303 /* Store one register. */
4305 store_register (struct regcache
*regcache
, int regno
)
4312 if (regno
>= the_low_target
.num_regs
)
4314 if ((*the_low_target
.cannot_store_register
) (regno
))
4317 regaddr
= register_addr (regno
);
4321 size
= ((register_size (regno
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4322 & -sizeof (PTRACE_XFER_TYPE
));
4323 buf
= alloca (size
);
4324 memset (buf
, 0, size
);
4326 if (the_low_target
.collect_ptrace_register
)
4327 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4329 collect_register (regcache
, regno
, buf
);
4331 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4332 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4335 ptrace (PTRACE_POKEUSER
, pid
,
4336 /* Coerce to a uintptr_t first to avoid potential gcc warning
4337 about coercing an 8 byte integer to a 4 byte pointer. */
4338 (PTRACE_ARG3_TYPE
) (uintptr_t) regaddr
,
4339 (PTRACE_ARG4_TYPE
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4342 /* At this point, ESRCH should mean the process is
4343 already gone, in which case we simply ignore attempts
4344 to change its registers. See also the related
4345 comment in linux_resume_one_lwp. */
4349 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4350 error ("writing register %d: %s", regno
, strerror (errno
));
4352 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4356 /* Fetch all registers, or just one, from the child process.
4357 If REGNO is -1, do this for all registers, skipping any that are
4358 assumed to have been retrieved by regsets_fetch_inferior_registers,
4359 unless ALL is non-zero.
4360 Otherwise, REGNO specifies which register (so we can save time). */
4362 usr_fetch_inferior_registers (struct regcache
*regcache
, int regno
, int all
)
4366 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
4367 if (all
|| !linux_register_in_regsets (regno
))
4368 fetch_register (regcache
, regno
);
4371 fetch_register (regcache
, regno
);
4374 /* Store our register values back into the inferior.
4375 If REGNO is -1, do this for all registers, skipping any that are
4376 assumed to have been saved by regsets_store_inferior_registers,
4377 unless ALL is non-zero.
4378 Otherwise, REGNO specifies which register (so we can save time). */
4380 usr_store_inferior_registers (struct regcache
*regcache
, int regno
, int all
)
4384 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
4385 if (all
|| !linux_register_in_regsets (regno
))
4386 store_register (regcache
, regno
);
4389 store_register (regcache
, regno
);
4392 #else /* !HAVE_LINUX_USRREGS */
4394 #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0)
4395 #define usr_store_inferior_registers(regcache, regno, all) do {} while (0)
4401 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4408 if (the_low_target
.fetch_register
!= NULL
)
4409 for (regno
= 0; regno
< the_low_target
.num_regs
; regno
++)
4410 (*the_low_target
.fetch_register
) (regcache
, regno
);
4412 all
= regsets_fetch_inferior_registers (regcache
);
4413 usr_fetch_inferior_registers (regcache
, -1, all
);
4417 if (the_low_target
.fetch_register
!= NULL
4418 && (*the_low_target
.fetch_register
) (regcache
, regno
))
4421 use_regsets
= linux_register_in_regsets (regno
);
4423 all
= regsets_fetch_inferior_registers (regcache
);
4424 if (!use_regsets
|| all
)
4425 usr_fetch_inferior_registers (regcache
, regno
, 1);
4430 linux_store_registers (struct regcache
*regcache
, int regno
)
4437 all
= regsets_store_inferior_registers (regcache
);
4438 usr_store_inferior_registers (regcache
, regno
, all
);
4442 use_regsets
= linux_register_in_regsets (regno
);
4444 all
= regsets_store_inferior_registers (regcache
);
4445 if (!use_regsets
|| all
)
4446 usr_store_inferior_registers (regcache
, regno
, 1);
4451 /* Copy LEN bytes from inferior's memory starting at MEMADDR
4452 to debugger memory starting at MYADDR. */
4455 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
4457 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4458 register PTRACE_XFER_TYPE
*buffer
;
4459 register CORE_ADDR addr
;
4466 /* Try using /proc. Don't bother for one word. */
4467 if (len
>= 3 * sizeof (long))
4471 /* We could keep this file open and cache it - possibly one per
4472 thread. That requires some juggling, but is even faster. */
4473 sprintf (filename
, "/proc/%d/mem", pid
);
4474 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
4478 /* If pread64 is available, use it. It's faster if the kernel
4479 supports it (only one syscall), and it's 64-bit safe even on
4480 32-bit platforms (for instance, SPARC debugging a SPARC64
4483 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
4486 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
4487 bytes
= read (fd
, myaddr
, len
);
4494 /* Some data was read, we'll try to get the rest with ptrace. */
4504 /* Round starting address down to longword boundary. */
4505 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4506 /* Round ending address up; get number of longwords that makes. */
4507 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4508 / sizeof (PTRACE_XFER_TYPE
));
4509 /* Allocate buffer of that many longwords. */
4510 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4512 /* Read all the longwords */
4514 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4516 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4517 about coercing an 8 byte integer to a 4 byte pointer. */
4518 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
4519 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
4520 (PTRACE_ARG4_TYPE
) 0);
4526 /* Copy appropriate bytes out of the buffer. */
4529 i
*= sizeof (PTRACE_XFER_TYPE
);
4530 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
4532 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4539 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
4540 memory at MEMADDR. On failure (cannot write to the inferior)
4541 returns the value of errno. Always succeeds if LEN is zero. */
4544 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
4547 /* Round starting address down to longword boundary. */
4548 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
4549 /* Round ending address up; get number of longwords that makes. */
4551 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
4552 / sizeof (PTRACE_XFER_TYPE
);
4554 /* Allocate buffer of that many longwords. */
4555 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
4556 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
4558 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4562 /* Zero length write always succeeds. */
4568 /* Dump up to four bytes. */
4569 unsigned int val
= * (unsigned int *) myaddr
;
4575 val
= val
& 0xffffff;
4576 fprintf (stderr
, "Writing %0*x to 0x%08lx\n", 2 * ((len
< 4) ? len
: 4),
4577 val
, (long)memaddr
);
4580 /* Fill start and end extra bytes of buffer with existing memory data. */
4583 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
4584 about coercing an 8 byte integer to a 4 byte pointer. */
4585 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
4586 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
4587 (PTRACE_ARG4_TYPE
) 0);
4595 = ptrace (PTRACE_PEEKTEXT
, pid
,
4596 /* Coerce to a uintptr_t first to avoid potential gcc warning
4597 about coercing an 8 byte integer to a 4 byte pointer. */
4598 (PTRACE_ARG3_TYPE
) (uintptr_t) (addr
+ (count
- 1)
4599 * sizeof (PTRACE_XFER_TYPE
)),
4600 (PTRACE_ARG4_TYPE
) 0);
4605 /* Copy data to be written over corresponding part of buffer. */
4607 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
4610 /* Write the entire buffer. */
4612 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
4615 ptrace (PTRACE_POKETEXT
, pid
,
4616 /* Coerce to a uintptr_t first to avoid potential gcc warning
4617 about coercing an 8 byte integer to a 4 byte pointer. */
4618 (PTRACE_ARG3_TYPE
) (uintptr_t) addr
,
4619 (PTRACE_ARG4_TYPE
) buffer
[i
]);
4627 /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
4628 static int linux_supports_tracefork_flag
;
4631 linux_enable_event_reporting (int pid
)
4633 if (!linux_supports_tracefork_flag
)
4636 ptrace (PTRACE_SETOPTIONS
, pid
, (PTRACE_ARG3_TYPE
) 0,
4637 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACECLONE
);
4640 /* Helper functions for linux_test_for_tracefork, called via clone (). */
4643 linux_tracefork_grandchild (void *arg
)
4648 #define STACK_SIZE 4096
4651 linux_tracefork_child (void *arg
)
4653 ptrace (PTRACE_TRACEME
, 0, (PTRACE_ARG3_TYPE
) 0, (PTRACE_ARG4_TYPE
) 0);
4654 kill (getpid (), SIGSTOP
);
4656 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4659 linux_tracefork_grandchild (NULL
);
4661 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4664 __clone2 (linux_tracefork_grandchild
, arg
, STACK_SIZE
,
4665 CLONE_VM
| SIGCHLD
, NULL
);
4667 clone (linux_tracefork_grandchild
, (char *) arg
+ STACK_SIZE
,
4668 CLONE_VM
| SIGCHLD
, NULL
);
4671 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4676 /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
4677 sure that we can enable the option, and that it had the desired
4681 linux_test_for_tracefork (void)
4683 int child_pid
, ret
, status
;
4685 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4686 char *stack
= xmalloc (STACK_SIZE
* 4);
4687 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4689 linux_supports_tracefork_flag
= 0;
4691 #if !(defined(__UCLIBC__) && defined(HAS_NOMMU))
4693 child_pid
= fork ();
4695 linux_tracefork_child (NULL
);
4697 #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4699 /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
4701 child_pid
= __clone2 (linux_tracefork_child
, stack
, STACK_SIZE
,
4702 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4703 #else /* !__ia64__ */
4704 child_pid
= clone (linux_tracefork_child
, stack
+ STACK_SIZE
,
4705 CLONE_VM
| SIGCHLD
, stack
+ STACK_SIZE
* 2);
4706 #endif /* !__ia64__ */
4708 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4710 if (child_pid
== -1)
4711 perror_with_name ("clone");
4713 ret
= my_waitpid (child_pid
, &status
, 0);
4715 perror_with_name ("waitpid");
4716 else if (ret
!= child_pid
)
4717 error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret
);
4718 if (! WIFSTOPPED (status
))
4719 error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status
);
4721 ret
= ptrace (PTRACE_SETOPTIONS
, child_pid
, (PTRACE_ARG3_TYPE
) 0,
4722 (PTRACE_ARG4_TYPE
) PTRACE_O_TRACEFORK
);
4725 ret
= ptrace (PTRACE_KILL
, child_pid
, (PTRACE_ARG3_TYPE
) 0,
4726 (PTRACE_ARG4_TYPE
) 0);
4729 warning ("linux_test_for_tracefork: failed to kill child");
4733 ret
= my_waitpid (child_pid
, &status
, 0);
4734 if (ret
!= child_pid
)
4735 warning ("linux_test_for_tracefork: failed to wait for killed child");
4736 else if (!WIFSIGNALED (status
))
4737 warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
4738 "killed child", status
);
4743 ret
= ptrace (PTRACE_CONT
, child_pid
, (PTRACE_ARG3_TYPE
) 0,
4744 (PTRACE_ARG4_TYPE
) 0);
4746 warning ("linux_test_for_tracefork: failed to resume child");
4748 ret
= my_waitpid (child_pid
, &status
, 0);
4750 if (ret
== child_pid
&& WIFSTOPPED (status
)
4751 && status
>> 16 == PTRACE_EVENT_FORK
)
4754 ret
= ptrace (PTRACE_GETEVENTMSG
, child_pid
, (PTRACE_ARG3_TYPE
) 0,
4756 if (ret
== 0 && second_pid
!= 0)
4760 linux_supports_tracefork_flag
= 1;
4761 my_waitpid (second_pid
, &second_status
, 0);
4762 ret
= ptrace (PTRACE_KILL
, second_pid
, (PTRACE_ARG3_TYPE
) 0,
4763 (PTRACE_ARG4_TYPE
) 0);
4765 warning ("linux_test_for_tracefork: failed to kill second child");
4766 my_waitpid (second_pid
, &status
, 0);
4770 warning ("linux_test_for_tracefork: unexpected result from waitpid "
4771 "(%d, status 0x%x)", ret
, status
);
4775 ret
= ptrace (PTRACE_KILL
, child_pid
, (PTRACE_ARG3_TYPE
) 0,
4776 (PTRACE_ARG4_TYPE
) 0);
4778 warning ("linux_test_for_tracefork: failed to kill child");
4779 my_waitpid (child_pid
, &status
, 0);
4781 while (WIFSTOPPED (status
));
4783 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
4785 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
4790 linux_look_up_symbols (void)
4792 #ifdef USE_THREAD_DB
4793 struct process_info
*proc
= current_process ();
4795 if (proc
->private->thread_db
!= NULL
)
4798 /* If the kernel supports tracing forks then it also supports tracing
4799 clones, and then we don't need to use the magic thread event breakpoint
4800 to learn about threads. */
4801 thread_db_init (!linux_supports_tracefork_flag
);
4806 linux_request_interrupt (void)
4808 extern unsigned long signal_pid
;
4810 if (!ptid_equal (cont_thread
, null_ptid
)
4811 && !ptid_equal (cont_thread
, minus_one_ptid
))
4813 struct lwp_info
*lwp
;
4816 lwp
= get_thread_lwp (current_inferior
);
4817 lwpid
= lwpid_of (lwp
);
4818 kill_lwp (lwpid
, SIGINT
);
4821 kill_lwp (signal_pid
, SIGINT
);
4824 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
4825 to debugger memory starting at MYADDR. */
4828 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
4830 char filename
[PATH_MAX
];
4832 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4834 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
4836 fd
= open (filename
, O_RDONLY
);
4840 if (offset
!= (CORE_ADDR
) 0
4841 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
4844 n
= read (fd
, myaddr
, len
);
4851 /* These breakpoint and watchpoint related wrapper functions simply
4852 pass on the function call if the target has registered a
4853 corresponding function. */
4856 linux_insert_point (char type
, CORE_ADDR addr
, int len
)
4858 if (the_low_target
.insert_point
!= NULL
)
4859 return the_low_target
.insert_point (type
, addr
, len
);
4861 /* Unsupported (see target.h). */
4866 linux_remove_point (char type
, CORE_ADDR addr
, int len
)
4868 if (the_low_target
.remove_point
!= NULL
)
4869 return the_low_target
.remove_point (type
, addr
, len
);
4871 /* Unsupported (see target.h). */
4876 linux_stopped_by_watchpoint (void)
4878 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4880 return lwp
->stopped_by_watchpoint
;
4884 linux_stopped_data_address (void)
4886 struct lwp_info
*lwp
= get_thread_lwp (current_inferior
);
4888 return lwp
->stopped_data_address
;
4891 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
4892 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
4893 && defined(PT_TEXT_END_ADDR)
4895 /* This is only used for targets that define PT_TEXT_ADDR,
4896 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
4897 the target has different ways of acquiring this information, like
4900 /* Under uClinux, programs are loaded at non-zero offsets, which we need
4901 to tell gdb about. */
4904 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
4906 unsigned long text
, text_end
, data
;
4907 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
4911 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_ARG3_TYPE
) PT_TEXT_ADDR
,
4912 (PTRACE_ARG4_TYPE
) 0);
4913 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_ARG3_TYPE
) PT_TEXT_END_ADDR
,
4914 (PTRACE_ARG4_TYPE
) 0);
4915 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_ARG3_TYPE
) PT_DATA_ADDR
,
4916 (PTRACE_ARG4_TYPE
) 0);
4920 /* Both text and data offsets produced at compile-time (and so
4921 used by gdb) are relative to the beginning of the program,
4922 with the data segment immediately following the text segment.
4923 However, the actual runtime layout in memory may put the data
4924 somewhere else, so when we send gdb a data base-address, we
4925 use the real data base address and subtract the compile-time
4926 data base-address from it (which is just the length of the
4927 text segment). BSS immediately follows data in both
4930 *data_p
= data
- (text_end
- text
);
4939 linux_qxfer_osdata (const char *annex
,
4940 unsigned char *readbuf
, unsigned const char *writebuf
,
4941 CORE_ADDR offset
, int len
)
4943 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
4946 /* Convert a native/host siginfo object, into/from the siginfo in the
4947 layout of the inferiors' architecture. */
4950 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
4954 if (the_low_target
.siginfo_fixup
!= NULL
)
4955 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
4957 /* If there was no callback, or the callback didn't do anything,
4958 then just do a straight memcpy. */
4962 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
4964 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
4969 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
4970 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
4974 char inf_siginfo
[sizeof (siginfo_t
)];
4976 if (current_inferior
== NULL
)
4979 pid
= lwpid_of (get_thread_lwp (current_inferior
));
4982 fprintf (stderr
, "%s siginfo for lwp %d.\n",
4983 readbuf
!= NULL
? "Reading" : "Writing",
4986 if (offset
>= sizeof (siginfo
))
4989 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_ARG3_TYPE
) 0, &siginfo
) != 0)
4992 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
4993 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
4994 inferior with a 64-bit GDBSERVER should look the same as debugging it
4995 with a 32-bit GDBSERVER, we need to convert it. */
4996 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
4998 if (offset
+ len
> sizeof (siginfo
))
4999 len
= sizeof (siginfo
) - offset
;
5001 if (readbuf
!= NULL
)
5002 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5005 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5007 /* Convert back to ptrace layout before flushing it out. */
5008 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5010 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_ARG3_TYPE
) 0, &siginfo
) != 0)
5017 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5018 so we notice when children change state; as the handler for the
5019 sigsuspend in my_waitpid. */
5022 sigchld_handler (int signo
)
5024 int old_errno
= errno
;
5030 /* fprintf is not async-signal-safe, so call write
5032 if (write (2, "sigchld_handler\n",
5033 sizeof ("sigchld_handler\n") - 1) < 0)
5034 break; /* just ignore */
5038 if (target_is_async_p ())
5039 async_file_mark (); /* trigger a linux_wait */
5045 linux_supports_non_stop (void)
5051 linux_async (int enable
)
5053 int previous
= (linux_event_pipe
[0] != -1);
5056 fprintf (stderr
, "linux_async (%d), previous=%d\n",
5059 if (previous
!= enable
)
5062 sigemptyset (&mask
);
5063 sigaddset (&mask
, SIGCHLD
);
5065 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5069 if (pipe (linux_event_pipe
) == -1)
5070 fatal ("creating event pipe failed.");
5072 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5073 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5075 /* Register the event loop handler. */
5076 add_file_handler (linux_event_pipe
[0],
5077 handle_target_event
, NULL
);
5079 /* Always trigger a linux_wait. */
5084 delete_file_handler (linux_event_pipe
[0]);
5086 close (linux_event_pipe
[0]);
5087 close (linux_event_pipe
[1]);
5088 linux_event_pipe
[0] = -1;
5089 linux_event_pipe
[1] = -1;
5092 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5099 linux_start_non_stop (int nonstop
)
5101 /* Register or unregister from event-loop accordingly. */
5102 linux_async (nonstop
);
5107 linux_supports_multi_process (void)
5113 linux_supports_disable_randomization (void)
5115 #ifdef HAVE_PERSONALITY
5123 linux_supports_agent (void)
5129 linux_supports_range_stepping (void)
5131 if (*the_low_target
.supports_range_stepping
== NULL
)
5134 return (*the_low_target
.supports_range_stepping
) ();
5137 /* Enumerate spufs IDs for process PID. */
5139 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5145 struct dirent
*entry
;
5147 sprintf (path
, "/proc/%ld/fd", pid
);
5148 dir
= opendir (path
);
5153 while ((entry
= readdir (dir
)) != NULL
)
5159 fd
= atoi (entry
->d_name
);
5163 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5164 if (stat (path
, &st
) != 0)
5166 if (!S_ISDIR (st
.st_mode
))
5169 if (statfs (path
, &stfs
) != 0)
5171 if (stfs
.f_type
!= SPUFS_MAGIC
)
5174 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5176 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5186 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5187 object type, using the /proc file system. */
5189 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5190 unsigned const char *writebuf
,
5191 CORE_ADDR offset
, int len
)
5193 long pid
= lwpid_of (get_thread_lwp (current_inferior
));
5198 if (!writebuf
&& !readbuf
)
5206 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5209 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5210 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5215 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5222 ret
= write (fd
, writebuf
, (size_t) len
);
5224 ret
= read (fd
, readbuf
, (size_t) len
);
5230 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5231 struct target_loadseg
5233 /* Core address to which the segment is mapped. */
5235 /* VMA recorded in the program header. */
5237 /* Size of this segment in memory. */
5241 # if defined PT_GETDSBT
5242 struct target_loadmap
5244 /* Protocol version number, must be zero. */
5246 /* Pointer to the DSBT table, its size, and the DSBT index. */
5247 unsigned *dsbt_table
;
5248 unsigned dsbt_size
, dsbt_index
;
5249 /* Number of segments in this map. */
5251 /* The actual memory map. */
5252 struct target_loadseg segs
[/*nsegs*/];
5254 # define LINUX_LOADMAP PT_GETDSBT
5255 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5256 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5258 struct target_loadmap
5260 /* Protocol version number, must be zero. */
5262 /* Number of segments in this map. */
5264 /* The actual memory map. */
5265 struct target_loadseg segs
[/*nsegs*/];
5267 # define LINUX_LOADMAP PTRACE_GETFDPIC
5268 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5269 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5273 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5274 unsigned char *myaddr
, unsigned int len
)
5276 int pid
= lwpid_of (get_thread_lwp (current_inferior
));
5278 struct target_loadmap
*data
= NULL
;
5279 unsigned int actual_length
, copy_length
;
5281 if (strcmp (annex
, "exec") == 0)
5282 addr
= (int) LINUX_LOADMAP_EXEC
;
5283 else if (strcmp (annex
, "interp") == 0)
5284 addr
= (int) LINUX_LOADMAP_INTERP
;
5288 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5294 actual_length
= sizeof (struct target_loadmap
)
5295 + sizeof (struct target_loadseg
) * data
->nsegs
;
5297 if (offset
< 0 || offset
> actual_length
)
5300 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5301 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5305 # define linux_read_loadmap NULL
5306 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5309 linux_process_qsupported (const char *query
)
5311 if (the_low_target
.process_qsupported
!= NULL
)
5312 the_low_target
.process_qsupported (query
);
5316 linux_supports_tracepoints (void)
5318 if (*the_low_target
.supports_tracepoints
== NULL
)
5321 return (*the_low_target
.supports_tracepoints
) ();
5325 linux_read_pc (struct regcache
*regcache
)
5327 if (the_low_target
.get_pc
== NULL
)
5330 return (*the_low_target
.get_pc
) (regcache
);
5334 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5336 gdb_assert (the_low_target
.set_pc
!= NULL
);
5338 (*the_low_target
.set_pc
) (regcache
, pc
);
5342 linux_thread_stopped (struct thread_info
*thread
)
5344 return get_thread_lwp (thread
)->stopped
;
5347 /* This exposes stop-all-threads functionality to other modules. */
5350 linux_pause_all (int freeze
)
5352 stop_all_lwps (freeze
, NULL
);
5355 /* This exposes unstop-all-threads functionality to other gdbserver
5359 linux_unpause_all (int unfreeze
)
5361 unstop_all_lwps (unfreeze
, NULL
);
5365 linux_prepare_to_access_memory (void)
5367 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5370 linux_pause_all (1);
5375 linux_done_accessing_memory (void)
5377 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5380 linux_unpause_all (1);
5384 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5385 CORE_ADDR collector
,
5388 CORE_ADDR
*jump_entry
,
5389 CORE_ADDR
*trampoline
,
5390 ULONGEST
*trampoline_size
,
5391 unsigned char *jjump_pad_insn
,
5392 ULONGEST
*jjump_pad_insn_size
,
5393 CORE_ADDR
*adjusted_insn_addr
,
5394 CORE_ADDR
*adjusted_insn_addr_end
,
5397 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5398 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5399 jump_entry
, trampoline
, trampoline_size
,
5400 jjump_pad_insn
, jjump_pad_insn_size
,
5401 adjusted_insn_addr
, adjusted_insn_addr_end
,
5405 static struct emit_ops
*
5406 linux_emit_ops (void)
5408 if (the_low_target
.emit_ops
!= NULL
)
5409 return (*the_low_target
.emit_ops
) ();
5415 linux_get_min_fast_tracepoint_insn_len (void)
5417 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5420 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5423 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5424 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5426 char filename
[PATH_MAX
];
5428 const int auxv_size
= is_elf64
5429 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5430 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5432 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5434 fd
= open (filename
, O_RDONLY
);
5440 while (read (fd
, buf
, auxv_size
) == auxv_size
5441 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
5445 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
5447 switch (aux
->a_type
)
5450 *phdr_memaddr
= aux
->a_un
.a_val
;
5453 *num_phdr
= aux
->a_un
.a_val
;
5459 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
5461 switch (aux
->a_type
)
5464 *phdr_memaddr
= aux
->a_un
.a_val
;
5467 *num_phdr
= aux
->a_un
.a_val
;
5475 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
5477 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
5478 "phdr_memaddr = %ld, phdr_num = %d",
5479 (long) *phdr_memaddr
, *num_phdr
);
5486 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
5489 get_dynamic (const int pid
, const int is_elf64
)
5491 CORE_ADDR phdr_memaddr
, relocation
;
5493 unsigned char *phdr_buf
;
5494 const int phdr_size
= is_elf64
? sizeof (Elf64_Phdr
) : sizeof (Elf32_Phdr
);
5496 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
5499 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
5500 phdr_buf
= alloca (num_phdr
* phdr_size
);
5502 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
5505 /* Compute relocation: it is expected to be 0 for "regular" executables,
5506 non-zero for PIE ones. */
5508 for (i
= 0; relocation
== -1 && i
< num_phdr
; i
++)
5511 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5513 if (p
->p_type
== PT_PHDR
)
5514 relocation
= phdr_memaddr
- p
->p_vaddr
;
5518 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5520 if (p
->p_type
== PT_PHDR
)
5521 relocation
= phdr_memaddr
- p
->p_vaddr
;
5524 if (relocation
== -1)
5526 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
5527 any real world executables, including PIE executables, have always
5528 PT_PHDR present. PT_PHDR is not present in some shared libraries or
5529 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
5530 or present DT_DEBUG anyway (fpc binaries are statically linked).
5532 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
5534 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
5539 for (i
= 0; i
< num_phdr
; i
++)
5543 Elf64_Phdr
*const p
= (Elf64_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5545 if (p
->p_type
== PT_DYNAMIC
)
5546 return p
->p_vaddr
+ relocation
;
5550 Elf32_Phdr
*const p
= (Elf32_Phdr
*) (phdr_buf
+ i
* phdr_size
);
5552 if (p
->p_type
== PT_DYNAMIC
)
5553 return p
->p_vaddr
+ relocation
;
5560 /* Return &_r_debug in the inferior, or -1 if not present. Return value
5561 can be 0 if the inferior does not yet have the library list initialized.
5562 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
5563 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
5566 get_r_debug (const int pid
, const int is_elf64
)
5568 CORE_ADDR dynamic_memaddr
;
5569 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
5570 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
5573 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
5574 if (dynamic_memaddr
== 0)
5577 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
5581 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
5582 #ifdef DT_MIPS_RLD_MAP
5586 unsigned char buf
[sizeof (Elf64_Xword
)];
5590 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5592 if (linux_read_memory (dyn
->d_un
.d_val
,
5593 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5598 #endif /* DT_MIPS_RLD_MAP */
5600 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5601 map
= dyn
->d_un
.d_val
;
5603 if (dyn
->d_tag
== DT_NULL
)
5608 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
5609 #ifdef DT_MIPS_RLD_MAP
5613 unsigned char buf
[sizeof (Elf32_Word
)];
5617 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
5619 if (linux_read_memory (dyn
->d_un
.d_val
,
5620 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
5625 #endif /* DT_MIPS_RLD_MAP */
5627 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
5628 map
= dyn
->d_un
.d_val
;
5630 if (dyn
->d_tag
== DT_NULL
)
5634 dynamic_memaddr
+= dyn_size
;
5640 /* Read one pointer from MEMADDR in the inferior. */
5643 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
5647 /* Go through a union so this works on either big or little endian
5648 hosts, when the inferior's pointer size is smaller than the size
5649 of CORE_ADDR. It is assumed the inferior's endianness is the
5650 same of the superior's. */
5653 CORE_ADDR core_addr
;
5658 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
5661 if (ptr_size
== sizeof (CORE_ADDR
))
5662 *ptr
= addr
.core_addr
;
5663 else if (ptr_size
== sizeof (unsigned int))
5666 gdb_assert_not_reached ("unhandled pointer size");
5671 struct link_map_offsets
5673 /* Offset and size of r_debug.r_version. */
5674 int r_version_offset
;
5676 /* Offset and size of r_debug.r_map. */
5679 /* Offset to l_addr field in struct link_map. */
5682 /* Offset to l_name field in struct link_map. */
5685 /* Offset to l_ld field in struct link_map. */
5688 /* Offset to l_next field in struct link_map. */
5691 /* Offset to l_prev field in struct link_map. */
5695 /* Construct qXfer:libraries-svr4:read reply. */
5698 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
5699 unsigned const char *writebuf
,
5700 CORE_ADDR offset
, int len
)
5703 unsigned document_len
;
5704 struct process_info_private
*const priv
= current_process ()->private;
5705 char filename
[PATH_MAX
];
5708 static const struct link_map_offsets lmo_32bit_offsets
=
5710 0, /* r_version offset. */
5711 4, /* r_debug.r_map offset. */
5712 0, /* l_addr offset in link_map. */
5713 4, /* l_name offset in link_map. */
5714 8, /* l_ld offset in link_map. */
5715 12, /* l_next offset in link_map. */
5716 16 /* l_prev offset in link_map. */
5719 static const struct link_map_offsets lmo_64bit_offsets
=
5721 0, /* r_version offset. */
5722 8, /* r_debug.r_map offset. */
5723 0, /* l_addr offset in link_map. */
5724 8, /* l_name offset in link_map. */
5725 16, /* l_ld offset in link_map. */
5726 24, /* l_next offset in link_map. */
5727 32 /* l_prev offset in link_map. */
5729 const struct link_map_offsets
*lmo
;
5730 unsigned int machine
;
5732 if (writebuf
!= NULL
)
5734 if (readbuf
== NULL
)
5737 pid
= lwpid_of (get_thread_lwp (current_inferior
));
5738 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
5739 is_elf64
= elf_64_file_p (filename
, &machine
);
5740 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
5742 if (priv
->r_debug
== 0)
5743 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
5745 /* We failed to find DT_DEBUG. Such situation will not change for this
5746 inferior - do not retry it. Report it to GDB as E01, see for the reasons
5747 at the GDB solib-svr4.c side. */
5748 if (priv
->r_debug
== (CORE_ADDR
) -1)
5751 if (priv
->r_debug
== 0)
5753 document
= xstrdup ("<library-list-svr4 version=\"1.0\"/>\n");
5757 int allocated
= 1024;
5759 const int ptr_size
= is_elf64
? 8 : 4;
5760 CORE_ADDR lm_addr
, lm_prev
, l_name
, l_addr
, l_ld
, l_next
, l_prev
;
5761 int r_version
, header_done
= 0;
5763 document
= xmalloc (allocated
);
5764 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
5765 p
= document
+ strlen (document
);
5768 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
5769 (unsigned char *) &r_version
,
5770 sizeof (r_version
)) != 0
5773 warning ("unexpected r_debug version %d", r_version
);
5777 if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
5778 &lm_addr
, ptr_size
) != 0)
5780 warning ("unable to read r_map from 0x%lx",
5781 (long) priv
->r_debug
+ lmo
->r_map_offset
);
5786 while (read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
5787 &l_name
, ptr_size
) == 0
5788 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
5789 &l_addr
, ptr_size
) == 0
5790 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
5791 &l_ld
, ptr_size
) == 0
5792 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
5793 &l_prev
, ptr_size
) == 0
5794 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
5795 &l_next
, ptr_size
) == 0)
5797 unsigned char libname
[PATH_MAX
];
5799 if (lm_prev
!= l_prev
)
5801 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
5802 (long) lm_prev
, (long) l_prev
);
5806 /* Not checking for error because reading may stop before
5807 we've got PATH_MAX worth of characters. */
5809 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
5810 libname
[sizeof (libname
) - 1] = '\0';
5811 if (libname
[0] != '\0')
5813 /* 6x the size for xml_escape_text below. */
5814 size_t len
= 6 * strlen ((char *) libname
);
5819 /* Terminate `<library-list-svr4'. */
5824 while (allocated
< p
- document
+ len
+ 200)
5826 /* Expand to guarantee sufficient storage. */
5827 uintptr_t document_len
= p
- document
;
5829 document
= xrealloc (document
, 2 * allocated
);
5831 p
= document
+ document_len
;
5834 name
= xml_escape_text ((char *) libname
);
5835 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
5836 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
5837 name
, (unsigned long) lm_addr
,
5838 (unsigned long) l_addr
, (unsigned long) l_ld
);
5841 else if (lm_prev
== 0)
5843 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
5856 /* Empty list; terminate `<library-list-svr4'. */
5860 strcpy (p
, "</library-list-svr4>");
5863 document_len
= strlen (document
);
5864 if (offset
< document_len
)
5865 document_len
-= offset
;
5868 if (len
> document_len
)
5871 memcpy (readbuf
, document
+ offset
, len
);
5877 #ifdef HAVE_LINUX_BTRACE
5879 /* Enable branch tracing. */
5881 static struct btrace_target_info
*
5882 linux_low_enable_btrace (ptid_t ptid
)
5884 struct btrace_target_info
*tinfo
;
5886 tinfo
= linux_enable_btrace (ptid
);
5888 tinfo
->ptr_bits
= register_size (0) * 8;
5893 /* Read branch trace data as btrace xml document. */
5896 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
5899 VEC (btrace_block_s
) *btrace
;
5900 struct btrace_block
*block
;
5903 btrace
= linux_read_btrace (tinfo
, type
);
5905 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
5906 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
5908 for (i
= 0; VEC_iterate (btrace_block_s
, btrace
, i
, block
); i
++)
5909 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
5910 paddress (block
->begin
), paddress (block
->end
));
5912 buffer_grow_str (buffer
, "</btrace>\n");
5914 VEC_free (btrace_block_s
, btrace
);
5916 #endif /* HAVE_LINUX_BTRACE */
5918 static struct target_ops linux_target_ops
= {
5919 linux_create_inferior
,
5928 linux_fetch_registers
,
5929 linux_store_registers
,
5930 linux_prepare_to_access_memory
,
5931 linux_done_accessing_memory
,
5934 linux_look_up_symbols
,
5935 linux_request_interrupt
,
5939 linux_stopped_by_watchpoint
,
5940 linux_stopped_data_address
,
5941 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5942 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5943 && defined(PT_TEXT_END_ADDR)
5948 #ifdef USE_THREAD_DB
5949 thread_db_get_tls_address
,
5954 hostio_last_error_from_errno
,
5957 linux_supports_non_stop
,
5959 linux_start_non_stop
,
5960 linux_supports_multi_process
,
5961 #ifdef USE_THREAD_DB
5962 thread_db_handle_monitor_command
,
5966 linux_common_core_of_thread
,
5968 linux_process_qsupported
,
5969 linux_supports_tracepoints
,
5972 linux_thread_stopped
,
5976 linux_cancel_breakpoints
,
5977 linux_stabilize_threads
,
5978 linux_install_fast_tracepoint_jump_pad
,
5980 linux_supports_disable_randomization
,
5981 linux_get_min_fast_tracepoint_insn_len
,
5982 linux_qxfer_libraries_svr4
,
5983 linux_supports_agent
,
5984 #ifdef HAVE_LINUX_BTRACE
5985 linux_supports_btrace
,
5986 linux_low_enable_btrace
,
5987 linux_disable_btrace
,
5988 linux_low_read_btrace
,
5995 linux_supports_range_stepping
,
5999 linux_init_signals ()
6001 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
6002 to find what the cancel signal actually is. */
6003 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
6004 signal (__SIGRTMIN
+1, SIG_IGN
);
6009 initialize_low (void)
6011 struct sigaction sigchld_action
;
6012 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
6013 set_target_ops (&linux_target_ops
);
6014 set_breakpoint_data (the_low_target
.breakpoint
,
6015 the_low_target
.breakpoint_len
);
6016 linux_init_signals ();
6017 linux_test_for_tracefork ();
6018 linux_ptrace_init_warnings ();
6019 #ifdef HAVE_LINUX_REGSETS
6020 for (num_regsets
= 0; target_regsets
[num_regsets
].size
>= 0; num_regsets
++)
6022 disabled_regsets
= xmalloc (num_regsets
);
6025 sigchld_action
.sa_handler
= sigchld_handler
;
6026 sigemptyset (&sigchld_action
.sa_mask
);
6027 sigchld_action
.sa_flags
= SA_RESTART
;
6028 sigaction (SIGCHLD
, &sigchld_action
, NULL
);