1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
21 #include "nat/linux-osdata.h"
25 #include "nat/linux-maps.h"
27 #include "nat/linux-nat.h"
28 #include "nat/linux-waitpid.h"
30 #include <sys/ptrace.h>
31 #include "nat/linux-ptrace.h"
32 #include "nat/linux-procfs.h"
33 #include "nat/linux-personality.h"
35 #include <sys/ioctl.h>
38 #include <sys/syscall.h>
42 #include <sys/types.h>
48 #include "filestuff.h"
49 #include "tracepoint.h"
53 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
54 then ELFMAG0 will have been defined. If it didn't get included by
55 gdb_proc_service.h then including it will likely introduce a duplicate
56 definition of elf_fpregset_t. */
59 #include "nat/linux-namespaces.h"
62 #define SPUFS_MAGIC 0x23c9b64e
65 #ifdef HAVE_PERSONALITY
66 # include <sys/personality.h>
67 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
68 # define ADDR_NO_RANDOMIZE 0x0040000
77 #define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
80 /* This is the kernel's hard limit. Not to be confused with
86 /* Some targets did not define these ptrace constants from the start,
87 so gdbserver defines them locally here. In the future, these may
88 be removed after they are added to asm/ptrace.h. */
89 #if !(defined(PT_TEXT_ADDR) \
90 || defined(PT_DATA_ADDR) \
91 || defined(PT_TEXT_END_ADDR))
92 #if defined(__mcoldfire__)
93 /* These are still undefined in 3.10 kernels. */
94 #define PT_TEXT_ADDR 49*4
95 #define PT_DATA_ADDR 50*4
96 #define PT_TEXT_END_ADDR 51*4
97 /* BFIN already defines these since at least 2.6.32 kernels. */
99 #define PT_TEXT_ADDR 220
100 #define PT_TEXT_END_ADDR 224
101 #define PT_DATA_ADDR 228
102 /* These are still undefined in 3.10 kernels. */
103 #elif defined(__TMS320C6X__)
104 #define PT_TEXT_ADDR (0x10000*4)
105 #define PT_DATA_ADDR (0x10004*4)
106 #define PT_TEXT_END_ADDR (0x10008*4)
110 #ifdef HAVE_LINUX_BTRACE
111 # include "nat/linux-btrace.h"
112 # include "btrace-common.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. */
147 /* See nat/linux-nat.h. */
150 ptid_of_lwp (struct lwp_info
*lwp
)
152 return ptid_of (get_lwp_thread (lwp
));
155 /* See nat/linux-nat.h. */
158 lwp_set_arch_private_info (struct lwp_info
*lwp
,
159 struct arch_lwp_info
*info
)
161 lwp
->arch_private
= info
;
164 /* See nat/linux-nat.h. */
166 struct arch_lwp_info
*
167 lwp_arch_private_info (struct lwp_info
*lwp
)
169 return lwp
->arch_private
;
172 /* See nat/linux-nat.h. */
175 lwp_is_stopped (struct lwp_info
*lwp
)
180 /* See nat/linux-nat.h. */
182 enum target_stop_reason
183 lwp_stop_reason (struct lwp_info
*lwp
)
185 return lwp
->stop_reason
;
188 typedef union ElfXX_Ehdr
194 typedef union ElfXX_Phdr
200 typedef union ElfXX_Nhdr
206 #define ELFXX_FLD(elf64, hdr, fld) ((elf64) ? (hdr)._64.fld : (hdr)._32.fld)
207 #define ELFXX_SIZEOF(elf64, hdr) ((elf64) ? sizeof ((hdr)._64) \
208 : sizeof ((hdr)._32))
209 /* Round up to next 4 byte boundary. */
210 #define ELFXX_ROUNDUP_4(elf64, what) (((what) + 3) & ~(ULONGEST) 3)
211 #define BUILD_ID_INVALID "?"
213 /* A list of all unknown processes which receive stop signals. Some
214 other process will presumably claim each of these as forked
215 children momentarily. */
217 struct simple_pid_list
219 /* The process ID. */
222 /* The status as reported by waitpid. */
226 struct simple_pid_list
*next
;
228 struct simple_pid_list
*stopped_pids
;
230 /* Trivial list manipulation functions to keep track of a list of new
231 stopped processes. */
234 add_to_pid_list (struct simple_pid_list
**listp
, int pid
, int status
)
236 struct simple_pid_list
*new_pid
= xmalloc (sizeof (struct simple_pid_list
));
239 new_pid
->status
= status
;
240 new_pid
->next
= *listp
;
245 pull_pid_from_list (struct simple_pid_list
**listp
, int pid
, int *statusp
)
247 struct simple_pid_list
**p
;
249 for (p
= listp
; *p
!= NULL
; p
= &(*p
)->next
)
250 if ((*p
)->pid
== pid
)
252 struct simple_pid_list
*next
= (*p
)->next
;
254 *statusp
= (*p
)->status
;
262 enum stopping_threads_kind
264 /* Not stopping threads presently. */
265 NOT_STOPPING_THREADS
,
267 /* Stopping threads. */
270 /* Stopping and suspending threads. */
271 STOPPING_AND_SUSPENDING_THREADS
274 /* This is set while stop_all_lwps is in effect. */
275 enum stopping_threads_kind stopping_threads
= NOT_STOPPING_THREADS
;
277 /* FIXME make into a target method? */
278 int using_threads
= 1;
280 /* True if we're presently stabilizing threads (moving them out of
282 static int stabilizing_threads
;
284 static void linux_resume_one_lwp (struct lwp_info
*lwp
,
285 int step
, int signal
, siginfo_t
*info
);
286 static void linux_resume (struct thread_resume
*resume_info
, size_t n
);
287 static void stop_all_lwps (int suspend
, struct lwp_info
*except
);
288 static void unstop_all_lwps (int unsuspend
, struct lwp_info
*except
);
289 static int linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
290 int *wstat
, int options
);
291 static int linux_wait_for_event (ptid_t ptid
, int *wstat
, int options
);
292 static struct lwp_info
*add_lwp (ptid_t ptid
);
293 static int linux_stopped_by_watchpoint (void);
294 static void mark_lwp_dead (struct lwp_info
*lwp
, int wstat
);
295 static void proceed_all_lwps (void);
296 static int finish_step_over (struct lwp_info
*lwp
);
297 static int kill_lwp (unsigned long lwpid
, int signo
);
299 /* When the event-loop is doing a step-over, this points at the thread
301 ptid_t step_over_bkpt
;
303 /* True if the low target can hardware single-step. Such targets
304 don't need a BREAKPOINT_REINSERT_ADDR callback. */
307 can_hardware_single_step (void)
309 return (the_low_target
.breakpoint_reinsert_addr
== NULL
);
312 /* True if the low target supports memory breakpoints. If so, we'll
313 have a GET_PC implementation. */
316 supports_breakpoints (void)
318 return (the_low_target
.get_pc
!= NULL
);
321 /* Returns true if this target can support fast tracepoints. This
322 does not mean that the in-process agent has been loaded in the
326 supports_fast_tracepoints (void)
328 return the_low_target
.install_fast_tracepoint_jump_pad
!= NULL
;
331 /* True if LWP is stopped in its stepping range. */
334 lwp_in_step_range (struct lwp_info
*lwp
)
336 CORE_ADDR pc
= lwp
->stop_pc
;
338 return (pc
>= lwp
->step_range_start
&& pc
< lwp
->step_range_end
);
341 struct pending_signals
345 struct pending_signals
*prev
;
348 /* The read/write ends of the pipe registered as waitable file in the
350 static int linux_event_pipe
[2] = { -1, -1 };
352 /* True if we're currently in async mode. */
353 #define target_is_async_p() (linux_event_pipe[0] != -1)
355 static void send_sigstop (struct lwp_info
*lwp
);
356 static void wait_for_sigstop (void);
358 /* Return non-zero if HEADER is a 64-bit ELF file. */
361 elf_64_header_p (const Elf64_Ehdr
*header
, unsigned int *machine
)
363 if (header
->e_ident
[EI_MAG0
] == ELFMAG0
364 && header
->e_ident
[EI_MAG1
] == ELFMAG1
365 && header
->e_ident
[EI_MAG2
] == ELFMAG2
366 && header
->e_ident
[EI_MAG3
] == ELFMAG3
)
368 *machine
= header
->e_machine
;
369 return header
->e_ident
[EI_CLASS
] == ELFCLASS64
;
376 /* Return non-zero if FILE is a 64-bit ELF file,
377 zero if the file is not a 64-bit ELF file,
378 and -1 if the file is not accessible or doesn't exist. */
381 elf_64_file_p (const char *file
, unsigned int *machine
)
386 fd
= open (file
, O_RDONLY
);
390 if (read (fd
, &header
, sizeof (header
)) != sizeof (header
))
397 return elf_64_header_p (&header
, machine
);
400 /* Accepts an integer PID; Returns true if the executable PID is
401 running is a 64-bit ELF file.. */
404 linux_pid_exe_is_elf_64_file (int pid
, unsigned int *machine
)
408 sprintf (file
, "/proc/%d/exe", pid
);
409 return elf_64_file_p (file
, machine
);
413 delete_lwp (struct lwp_info
*lwp
)
415 struct thread_info
*thr
= get_lwp_thread (lwp
);
418 debug_printf ("deleting %ld\n", lwpid_of (thr
));
421 free (lwp
->arch_private
);
425 /* Add a process to the common process list, and set its private
428 static struct process_info
*
429 linux_add_process (int pid
, int attached
)
431 struct process_info
*proc
;
433 proc
= add_process (pid
, attached
);
434 proc
->priv
= xcalloc (1, sizeof (*proc
->priv
));
436 /* Set the arch when the first LWP stops. */
437 proc
->priv
->new_inferior
= 1;
439 if (the_low_target
.new_process
!= NULL
)
440 proc
->priv
->arch_private
= the_low_target
.new_process ();
445 static CORE_ADDR
get_pc (struct lwp_info
*lwp
);
447 /* Handle a GNU/Linux extended wait response. If we see a clone
448 event, we need to add the new LWP to our list (and return 0 so as
449 not to report the trap to higher layers). */
452 handle_extended_wait (struct lwp_info
*event_lwp
, int wstat
)
454 int event
= linux_ptrace_get_extended_event (wstat
);
455 struct thread_info
*event_thr
= get_lwp_thread (event_lwp
);
456 struct lwp_info
*new_lwp
;
458 if ((event
== PTRACE_EVENT_FORK
) || (event
== PTRACE_EVENT_VFORK
)
459 || (event
== PTRACE_EVENT_CLONE
))
462 unsigned long new_pid
;
465 /* Get the pid of the new lwp. */
466 ptrace (PTRACE_GETEVENTMSG
, lwpid_of (event_thr
), (PTRACE_TYPE_ARG3
) 0,
469 /* If we haven't already seen the new PID stop, wait for it now. */
470 if (!pull_pid_from_list (&stopped_pids
, new_pid
, &status
))
472 /* The new child has a pending SIGSTOP. We can't affect it until it
473 hits the SIGSTOP, but we're already attached. */
475 ret
= my_waitpid (new_pid
, &status
, __WALL
);
478 perror_with_name ("waiting for new child");
479 else if (ret
!= new_pid
)
480 warning ("wait returned unexpected PID %d", ret
);
481 else if (!WIFSTOPPED (status
))
482 warning ("wait returned unexpected status 0x%x", status
);
485 if (event
== PTRACE_EVENT_FORK
|| event
== PTRACE_EVENT_VFORK
)
487 struct process_info
*parent_proc
;
488 struct process_info
*child_proc
;
489 struct lwp_info
*child_lwp
;
490 struct thread_info
*child_thr
;
491 struct target_desc
*tdesc
;
493 ptid
= ptid_build (new_pid
, new_pid
, 0);
497 debug_printf ("HEW: Got fork event from LWP %ld, "
499 ptid_get_lwp (ptid_of (event_thr
)),
500 ptid_get_pid (ptid
));
503 /* Add the new process to the tables and clone the breakpoint
504 lists of the parent. We need to do this even if the new process
505 will be detached, since we will need the process object and the
506 breakpoints to remove any breakpoints from memory when we
507 detach, and the client side will access registers. */
508 child_proc
= linux_add_process (new_pid
, 0);
509 gdb_assert (child_proc
!= NULL
);
510 child_lwp
= add_lwp (ptid
);
511 gdb_assert (child_lwp
!= NULL
);
512 child_lwp
->stopped
= 1;
513 child_lwp
->must_set_ptrace_flags
= 1;
514 child_lwp
->status_pending_p
= 0;
515 child_thr
= get_lwp_thread (child_lwp
);
516 child_thr
->last_resume_kind
= resume_stop
;
517 parent_proc
= get_thread_process (event_thr
);
518 child_proc
->attached
= parent_proc
->attached
;
519 clone_all_breakpoints (&child_proc
->breakpoints
,
520 &child_proc
->raw_breakpoints
,
521 parent_proc
->breakpoints
);
523 tdesc
= xmalloc (sizeof (struct target_desc
));
524 copy_target_description (tdesc
, parent_proc
->tdesc
);
525 child_proc
->tdesc
= tdesc
;
527 /* Clone arch-specific process data. */
528 if (the_low_target
.new_fork
!= NULL
)
529 the_low_target
.new_fork (parent_proc
, child_proc
);
531 /* Save fork info in the parent thread. */
532 if (event
== PTRACE_EVENT_FORK
)
533 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_FORKED
;
534 else if (event
== PTRACE_EVENT_VFORK
)
535 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORKED
;
537 event_lwp
->waitstatus
.value
.related_pid
= ptid
;
539 /* The status_pending field contains bits denoting the
540 extended event, so when the pending event is handled,
541 the handler will look at lwp->waitstatus. */
542 event_lwp
->status_pending_p
= 1;
543 event_lwp
->status_pending
= wstat
;
545 /* Report the event. */
550 debug_printf ("HEW: Got clone event "
551 "from LWP %ld, new child is LWP %ld\n",
552 lwpid_of (event_thr
), new_pid
);
554 ptid
= ptid_build (pid_of (event_thr
), new_pid
, 0);
555 new_lwp
= add_lwp (ptid
);
557 /* Either we're going to immediately resume the new thread
558 or leave it stopped. linux_resume_one_lwp is a nop if it
559 thinks the thread is currently running, so set this first
560 before calling linux_resume_one_lwp. */
561 new_lwp
->stopped
= 1;
563 /* If we're suspending all threads, leave this one suspended
565 if (stopping_threads
== STOPPING_AND_SUSPENDING_THREADS
)
566 new_lwp
->suspended
= 1;
568 /* Normally we will get the pending SIGSTOP. But in some cases
569 we might get another signal delivered to the group first.
570 If we do get another signal, be sure not to lose it. */
571 if (WSTOPSIG (status
) != SIGSTOP
)
573 new_lwp
->stop_expected
= 1;
574 new_lwp
->status_pending_p
= 1;
575 new_lwp
->status_pending
= status
;
578 /* Don't report the event. */
581 else if (event
== PTRACE_EVENT_VFORK_DONE
)
583 event_lwp
->waitstatus
.kind
= TARGET_WAITKIND_VFORK_DONE
;
585 /* Report the event. */
589 internal_error (__FILE__
, __LINE__
, _("unknown ptrace event %d"), event
);
592 /* Return the PC as read from the regcache of LWP, without any
596 get_pc (struct lwp_info
*lwp
)
598 struct thread_info
*saved_thread
;
599 struct regcache
*regcache
;
602 if (the_low_target
.get_pc
== NULL
)
605 saved_thread
= current_thread
;
606 current_thread
= get_lwp_thread (lwp
);
608 regcache
= get_thread_regcache (current_thread
, 1);
609 pc
= (*the_low_target
.get_pc
) (regcache
);
612 debug_printf ("pc is 0x%lx\n", (long) pc
);
614 current_thread
= saved_thread
;
618 /* This function should only be called if LWP got a SIGTRAP.
619 The SIGTRAP could mean several things.
621 On i386, where decr_pc_after_break is non-zero:
623 If we were single-stepping this process using PTRACE_SINGLESTEP, we
624 will get only the one SIGTRAP. The value of $eip will be the next
625 instruction. If the instruction we stepped over was a breakpoint,
626 we need to decrement the PC.
628 If we continue the process using PTRACE_CONT, we will get a
629 SIGTRAP when we hit a breakpoint. The value of $eip will be
630 the instruction after the breakpoint (i.e. needs to be
631 decremented). If we report the SIGTRAP to GDB, we must also
632 report the undecremented PC. If the breakpoint is removed, we
633 must resume at the decremented PC.
635 On a non-decr_pc_after_break machine with hardware or kernel
638 If we either single-step a breakpoint instruction, or continue and
639 hit a breakpoint instruction, our PC will point at the breakpoint
643 check_stopped_by_breakpoint (struct lwp_info
*lwp
)
646 CORE_ADDR sw_breakpoint_pc
;
647 struct thread_info
*saved_thread
;
648 #if USE_SIGTRAP_SIGINFO
652 if (the_low_target
.get_pc
== NULL
)
656 sw_breakpoint_pc
= pc
- the_low_target
.decr_pc_after_break
;
658 /* breakpoint_at reads from the current thread. */
659 saved_thread
= current_thread
;
660 current_thread
= get_lwp_thread (lwp
);
662 #if USE_SIGTRAP_SIGINFO
663 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
664 (PTRACE_TYPE_ARG3
) 0, &siginfo
) == 0)
666 if (siginfo
.si_signo
== SIGTRAP
)
668 if (siginfo
.si_code
== GDB_ARCH_TRAP_BRKPT
)
672 struct thread_info
*thr
= get_lwp_thread (lwp
);
674 debug_printf ("CSBB: %s stopped by software breakpoint\n",
675 target_pid_to_str (ptid_of (thr
)));
678 /* Back up the PC if necessary. */
679 if (pc
!= sw_breakpoint_pc
)
681 struct regcache
*regcache
682 = get_thread_regcache (current_thread
, 1);
683 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
686 lwp
->stop_pc
= sw_breakpoint_pc
;
687 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
688 current_thread
= saved_thread
;
691 else if (siginfo
.si_code
== TRAP_HWBKPT
)
695 struct thread_info
*thr
= get_lwp_thread (lwp
);
697 debug_printf ("CSBB: %s stopped by hardware "
698 "breakpoint/watchpoint\n",
699 target_pid_to_str (ptid_of (thr
)));
703 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
704 current_thread
= saved_thread
;
707 else if (siginfo
.si_code
== TRAP_TRACE
)
711 struct thread_info
*thr
= get_lwp_thread (lwp
);
713 debug_printf ("CSBB: %s stopped by trace\n",
714 target_pid_to_str (ptid_of (thr
)));
720 /* We may have just stepped a breakpoint instruction. E.g., in
721 non-stop mode, GDB first tells the thread A to step a range, and
722 then the user inserts a breakpoint inside the range. In that
723 case we need to report the breakpoint PC. */
724 if ((!lwp
->stepping
|| lwp
->stop_pc
== sw_breakpoint_pc
)
725 && (*the_low_target
.breakpoint_at
) (sw_breakpoint_pc
))
729 struct thread_info
*thr
= get_lwp_thread (lwp
);
731 debug_printf ("CSBB: %s stopped by software breakpoint\n",
732 target_pid_to_str (ptid_of (thr
)));
735 /* Back up the PC if necessary. */
736 if (pc
!= sw_breakpoint_pc
)
738 struct regcache
*regcache
739 = get_thread_regcache (current_thread
, 1);
740 (*the_low_target
.set_pc
) (regcache
, sw_breakpoint_pc
);
743 lwp
->stop_pc
= sw_breakpoint_pc
;
744 lwp
->stop_reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
745 current_thread
= saved_thread
;
749 if (hardware_breakpoint_inserted_here (pc
))
753 struct thread_info
*thr
= get_lwp_thread (lwp
);
755 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
756 target_pid_to_str (ptid_of (thr
)));
760 lwp
->stop_reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
761 current_thread
= saved_thread
;
766 current_thread
= saved_thread
;
770 static struct lwp_info
*
771 add_lwp (ptid_t ptid
)
773 struct lwp_info
*lwp
;
775 lwp
= (struct lwp_info
*) xmalloc (sizeof (*lwp
));
776 memset (lwp
, 0, sizeof (*lwp
));
778 if (the_low_target
.new_thread
!= NULL
)
779 the_low_target
.new_thread (lwp
);
781 lwp
->thread
= add_thread (ptid
, lwp
);
786 /* Start an inferior process and returns its pid.
787 ALLARGS is a vector of program-name and args. */
790 linux_create_inferior (char *program
, char **allargs
)
792 struct lwp_info
*new_lwp
;
795 struct cleanup
*restore_personality
796 = maybe_disable_address_space_randomization (disable_randomization
);
798 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
804 perror_with_name ("fork");
809 ptrace (PTRACE_TRACEME
, 0, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
811 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
812 signal (__SIGRTMIN
+ 1, SIG_DFL
);
817 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
818 stdout to stderr so that inferior i/o doesn't corrupt the connection.
819 Also, redirect stdin to /dev/null. */
820 if (remote_connection_is_stdio ())
823 open ("/dev/null", O_RDONLY
);
825 if (write (2, "stdin/stdout redirected\n",
826 sizeof ("stdin/stdout redirected\n") - 1) < 0)
828 /* Errors ignored. */;
832 execv (program
, allargs
);
834 execvp (program
, allargs
);
836 fprintf (stderr
, "Cannot exec %s: %s.\n", program
,
842 do_cleanups (restore_personality
);
844 linux_add_process (pid
, 0);
846 ptid
= ptid_build (pid
, pid
, 0);
847 new_lwp
= add_lwp (ptid
);
848 new_lwp
->must_set_ptrace_flags
= 1;
853 /* Attach to an inferior process. Returns 0 on success, ERRNO on
857 linux_attach_lwp (ptid_t ptid
)
859 struct lwp_info
*new_lwp
;
860 int lwpid
= ptid_get_lwp (ptid
);
862 if (ptrace (PTRACE_ATTACH
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0)
866 new_lwp
= add_lwp (ptid
);
868 /* We need to wait for SIGSTOP before being able to make the next
869 ptrace call on this LWP. */
870 new_lwp
->must_set_ptrace_flags
= 1;
872 if (linux_proc_pid_is_stopped (lwpid
))
875 debug_printf ("Attached to a stopped process\n");
877 /* The process is definitely stopped. It is in a job control
878 stop, unless the kernel predates the TASK_STOPPED /
879 TASK_TRACED distinction, in which case it might be in a
880 ptrace stop. Make sure it is in a ptrace stop; from there we
881 can kill it, signal it, et cetera.
883 First make sure there is a pending SIGSTOP. Since we are
884 already attached, the process can not transition from stopped
885 to running without a PTRACE_CONT; so we know this signal will
886 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
887 probably already in the queue (unless this kernel is old
888 enough to use TASK_STOPPED for ptrace stops); but since
889 SIGSTOP is not an RT signal, it can only be queued once. */
890 kill_lwp (lwpid
, SIGSTOP
);
892 /* Finally, resume the stopped process. This will deliver the
893 SIGSTOP (or a higher priority signal, just like normal
894 PTRACE_ATTACH), which we'll catch later on. */
895 ptrace (PTRACE_CONT
, lwpid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
898 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
901 There are several cases to consider here:
903 1) gdbserver has already attached to the process and is being notified
904 of a new thread that is being created.
905 In this case we should ignore that SIGSTOP and resume the
906 process. This is handled below by setting stop_expected = 1,
907 and the fact that add_thread sets last_resume_kind ==
910 2) This is the first thread (the process thread), and we're attaching
911 to it via attach_inferior.
912 In this case we want the process thread to stop.
913 This is handled by having linux_attach set last_resume_kind ==
914 resume_stop after we return.
916 If the pid we are attaching to is also the tgid, we attach to and
917 stop all the existing threads. Otherwise, we attach to pid and
918 ignore any other threads in the same group as this pid.
920 3) GDB is connecting to gdbserver and is requesting an enumeration of all
922 In this case we want the thread to stop.
923 FIXME: This case is currently not properly handled.
924 We should wait for the SIGSTOP but don't. Things work apparently
925 because enough time passes between when we ptrace (ATTACH) and when
926 gdb makes the next ptrace call on the thread.
928 On the other hand, if we are currently trying to stop all threads, we
929 should treat the new thread as if we had sent it a SIGSTOP. This works
930 because we are guaranteed that the add_lwp call above added us to the
931 end of the list, and so the new thread has not yet reached
932 wait_for_sigstop (but will). */
933 new_lwp
->stop_expected
= 1;
938 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
939 already attached. Returns true if a new LWP is found, false
943 attach_proc_task_lwp_callback (ptid_t ptid
)
945 /* Is this a new thread? */
946 if (find_thread_ptid (ptid
) == NULL
)
948 int lwpid
= ptid_get_lwp (ptid
);
952 debug_printf ("Found new lwp %d\n", lwpid
);
954 err
= linux_attach_lwp (ptid
);
956 /* Be quiet if we simply raced with the thread exiting. EPERM
957 is returned if the thread's task still exists, and is marked
958 as exited or zombie, as well as other conditions, so in that
959 case, confirm the status in /proc/PID/status. */
961 || (err
== EPERM
&& linux_proc_pid_is_gone (lwpid
)))
965 debug_printf ("Cannot attach to lwp %d: "
966 "thread is gone (%d: %s)\n",
967 lwpid
, err
, strerror (err
));
972 warning (_("Cannot attach to lwp %d: %s"),
974 linux_ptrace_attach_fail_reason_string (ptid
, err
));
982 /* Attach to PID. If PID is the tgid, attach to it and all
986 linux_attach (unsigned long pid
)
988 ptid_t ptid
= ptid_build (pid
, pid
, 0);
991 /* Attach to PID. We will check for other threads
993 err
= linux_attach_lwp (ptid
);
995 error ("Cannot attach to process %ld: %s",
996 pid
, linux_ptrace_attach_fail_reason_string (ptid
, err
));
998 linux_add_process (pid
, 1);
1002 struct thread_info
*thread
;
1004 /* Don't ignore the initial SIGSTOP if we just attached to this
1005 process. It will be collected by wait shortly. */
1006 thread
= find_thread_ptid (ptid_build (pid
, pid
, 0));
1007 thread
->last_resume_kind
= resume_stop
;
1010 /* We must attach to every LWP. If /proc is mounted, use that to
1011 find them now. On the one hand, the inferior may be using raw
1012 clone instead of using pthreads. On the other hand, even if it
1013 is using pthreads, GDB may not be connected yet (thread_db needs
1014 to do symbol lookups, through qSymbol). Also, thread_db walks
1015 structures in the inferior's address space to find the list of
1016 threads/LWPs, and those structures may well be corrupted. Note
1017 that once thread_db is loaded, we'll still use it to list threads
1018 and associate pthread info with each LWP. */
1019 linux_proc_attach_tgid_threads (pid
, attach_proc_task_lwp_callback
);
1030 second_thread_of_pid_p (struct inferior_list_entry
*entry
, void *args
)
1032 struct counter
*counter
= args
;
1034 if (ptid_get_pid (entry
->id
) == counter
->pid
)
1036 if (++counter
->count
> 1)
1044 last_thread_of_process_p (int pid
)
1046 struct counter counter
= { pid
, 0 };
1048 return (find_inferior (&all_threads
,
1049 second_thread_of_pid_p
, &counter
) == NULL
);
1055 linux_kill_one_lwp (struct lwp_info
*lwp
)
1057 struct thread_info
*thr
= get_lwp_thread (lwp
);
1058 int pid
= lwpid_of (thr
);
1060 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1061 there is no signal context, and ptrace(PTRACE_KILL) (or
1062 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1063 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1064 alternative is to kill with SIGKILL. We only need one SIGKILL
1065 per process, not one for each thread. But since we still support
1066 linuxthreads, and we also support debugging programs using raw
1067 clone without CLONE_THREAD, we send one for each thread. For
1068 years, we used PTRACE_KILL only, so we're being a bit paranoid
1069 about some old kernels where PTRACE_KILL might work better
1070 (dubious if there are any such, but that's why it's paranoia), so
1071 we try SIGKILL first, PTRACE_KILL second, and so we're fine
1075 kill_lwp (pid
, SIGKILL
);
1078 int save_errno
= errno
;
1080 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1081 target_pid_to_str (ptid_of (thr
)),
1082 save_errno
? strerror (save_errno
) : "OK");
1086 ptrace (PTRACE_KILL
, pid
, (PTRACE_TYPE_ARG3
) 0, (PTRACE_TYPE_ARG4
) 0);
1089 int save_errno
= errno
;
1091 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1092 target_pid_to_str (ptid_of (thr
)),
1093 save_errno
? strerror (save_errno
) : "OK");
1097 /* Kill LWP and wait for it to die. */
1100 kill_wait_lwp (struct lwp_info
*lwp
)
1102 struct thread_info
*thr
= get_lwp_thread (lwp
);
1103 int pid
= ptid_get_pid (ptid_of (thr
));
1104 int lwpid
= ptid_get_lwp (ptid_of (thr
));
1109 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid
, pid
);
1113 linux_kill_one_lwp (lwp
);
1115 /* Make sure it died. Notes:
1117 - The loop is most likely unnecessary.
1119 - We don't use linux_wait_for_event as that could delete lwps
1120 while we're iterating over them. We're not interested in
1121 any pending status at this point, only in making sure all
1122 wait status on the kernel side are collected until the
1125 - We don't use __WALL here as the __WALL emulation relies on
1126 SIGCHLD, and killing a stopped process doesn't generate
1127 one, nor an exit status.
1129 res
= my_waitpid (lwpid
, &wstat
, 0);
1130 if (res
== -1 && errno
== ECHILD
)
1131 res
= my_waitpid (lwpid
, &wstat
, __WCLONE
);
1132 } while (res
> 0 && WIFSTOPPED (wstat
));
1134 /* Even if it was stopped, the child may have already disappeared.
1135 E.g., if it was killed by SIGKILL. */
1136 if (res
< 0 && errno
!= ECHILD
)
1137 perror_with_name ("kill_wait_lwp");
1140 /* Callback for `find_inferior'. Kills an lwp of a given process,
1141 except the leader. */
1144 kill_one_lwp_callback (struct inferior_list_entry
*entry
, void *args
)
1146 struct thread_info
*thread
= (struct thread_info
*) entry
;
1147 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1148 int pid
= * (int *) args
;
1150 if (ptid_get_pid (entry
->id
) != pid
)
1153 /* We avoid killing the first thread here, because of a Linux kernel (at
1154 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1155 the children get a chance to be reaped, it will remain a zombie
1158 if (lwpid_of (thread
) == pid
)
1161 debug_printf ("lkop: is last of process %s\n",
1162 target_pid_to_str (entry
->id
));
1166 kill_wait_lwp (lwp
);
1171 linux_kill (int pid
)
1173 struct process_info
*process
;
1174 struct lwp_info
*lwp
;
1176 process
= find_process_pid (pid
);
1177 if (process
== NULL
)
1180 /* If we're killing a running inferior, make sure it is stopped
1181 first, as PTRACE_KILL will not work otherwise. */
1182 stop_all_lwps (0, NULL
);
1184 find_inferior (&all_threads
, kill_one_lwp_callback
, &pid
);
1186 /* See the comment in linux_kill_one_lwp. We did not kill the first
1187 thread in the list, so do so now. */
1188 lwp
= find_lwp_pid (pid_to_ptid (pid
));
1193 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1197 kill_wait_lwp (lwp
);
1199 the_target
->mourn (process
);
1201 /* Since we presently can only stop all lwps of all processes, we
1202 need to unstop lwps of other processes. */
1203 unstop_all_lwps (0, NULL
);
1207 /* Get pending signal of THREAD, for detaching purposes. This is the
1208 signal the thread last stopped for, which we need to deliver to the
1209 thread when detaching, otherwise, it'd be suppressed/lost. */
1212 get_detach_signal (struct thread_info
*thread
)
1214 enum gdb_signal signo
= GDB_SIGNAL_0
;
1216 struct lwp_info
*lp
= get_thread_lwp (thread
);
1218 if (lp
->status_pending_p
)
1219 status
= lp
->status_pending
;
1222 /* If the thread had been suspended by gdbserver, and it stopped
1223 cleanly, then it'll have stopped with SIGSTOP. But we don't
1224 want to deliver that SIGSTOP. */
1225 if (thread
->last_status
.kind
!= TARGET_WAITKIND_STOPPED
1226 || thread
->last_status
.value
.sig
== GDB_SIGNAL_0
)
1229 /* Otherwise, we may need to deliver the signal we
1231 status
= lp
->last_status
;
1234 if (!WIFSTOPPED (status
))
1237 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1238 target_pid_to_str (ptid_of (thread
)));
1242 /* Extended wait statuses aren't real SIGTRAPs. */
1243 if (WSTOPSIG (status
) == SIGTRAP
&& linux_is_extended_waitstatus (status
))
1246 debug_printf ("GPS: lwp %s had stopped with extended "
1247 "status: no pending signal\n",
1248 target_pid_to_str (ptid_of (thread
)));
1252 signo
= gdb_signal_from_host (WSTOPSIG (status
));
1254 if (program_signals_p
&& !program_signals
[signo
])
1257 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1258 target_pid_to_str (ptid_of (thread
)),
1259 gdb_signal_to_string (signo
));
1262 else if (!program_signals_p
1263 /* If we have no way to know which signals GDB does not
1264 want to have passed to the program, assume
1265 SIGTRAP/SIGINT, which is GDB's default. */
1266 && (signo
== GDB_SIGNAL_TRAP
|| signo
== GDB_SIGNAL_INT
))
1269 debug_printf ("GPS: lwp %s had signal %s, "
1270 "but we don't know if we should pass it. "
1271 "Default to not.\n",
1272 target_pid_to_str (ptid_of (thread
)),
1273 gdb_signal_to_string (signo
));
1279 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1280 target_pid_to_str (ptid_of (thread
)),
1281 gdb_signal_to_string (signo
));
1283 return WSTOPSIG (status
);
1288 linux_detach_one_lwp (struct inferior_list_entry
*entry
, void *args
)
1290 struct thread_info
*thread
= (struct thread_info
*) entry
;
1291 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1292 int pid
= * (int *) args
;
1295 if (ptid_get_pid (entry
->id
) != pid
)
1298 /* If there is a pending SIGSTOP, get rid of it. */
1299 if (lwp
->stop_expected
)
1302 debug_printf ("Sending SIGCONT to %s\n",
1303 target_pid_to_str (ptid_of (thread
)));
1305 kill_lwp (lwpid_of (thread
), SIGCONT
);
1306 lwp
->stop_expected
= 0;
1309 /* Flush any pending changes to the process's registers. */
1310 regcache_invalidate_thread (thread
);
1312 /* Pass on any pending signal for this thread. */
1313 sig
= get_detach_signal (thread
);
1315 /* Finally, let it resume. */
1316 if (the_low_target
.prepare_to_resume
!= NULL
)
1317 the_low_target
.prepare_to_resume (lwp
);
1318 if (ptrace (PTRACE_DETACH
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1319 (PTRACE_TYPE_ARG4
) (long) sig
) < 0)
1320 error (_("Can't detach %s: %s"),
1321 target_pid_to_str (ptid_of (thread
)),
1329 linux_detach (int pid
)
1331 struct process_info
*process
;
1333 process
= find_process_pid (pid
);
1334 if (process
== NULL
)
1337 /* Stop all threads before detaching. First, ptrace requires that
1338 the thread is stopped to sucessfully detach. Second, thread_db
1339 may need to uninstall thread event breakpoints from memory, which
1340 only works with a stopped process anyway. */
1341 stop_all_lwps (0, NULL
);
1343 #ifdef USE_THREAD_DB
1344 thread_db_detach (process
);
1347 /* Stabilize threads (move out of jump pads). */
1348 stabilize_threads ();
1350 find_inferior (&all_threads
, linux_detach_one_lwp
, &pid
);
1352 the_target
->mourn (process
);
1354 /* Since we presently can only stop all lwps of all processes, we
1355 need to unstop lwps of other processes. */
1356 unstop_all_lwps (0, NULL
);
1360 /* Remove all LWPs that belong to process PROC from the lwp list. */
1363 delete_lwp_callback (struct inferior_list_entry
*entry
, void *proc
)
1365 struct thread_info
*thread
= (struct thread_info
*) entry
;
1366 struct lwp_info
*lwp
= get_thread_lwp (thread
);
1367 struct process_info
*process
= proc
;
1369 if (pid_of (thread
) == pid_of (process
))
1376 linux_mourn (struct process_info
*process
)
1378 struct process_info_private
*priv
;
1380 #ifdef USE_THREAD_DB
1381 thread_db_mourn (process
);
1384 find_inferior (&all_threads
, delete_lwp_callback
, process
);
1386 /* Freeing all private data. */
1387 priv
= process
->priv
;
1388 free (priv
->arch_private
);
1390 process
->priv
= NULL
;
1392 remove_process (process
);
1396 linux_join (int pid
)
1401 ret
= my_waitpid (pid
, &status
, 0);
1402 if (WIFEXITED (status
) || WIFSIGNALED (status
))
1404 } while (ret
!= -1 || errno
!= ECHILD
);
1407 /* Return nonzero if the given thread is still alive. */
1409 linux_thread_alive (ptid_t ptid
)
1411 struct lwp_info
*lwp
= find_lwp_pid (ptid
);
1413 /* We assume we always know if a thread exits. If a whole process
1414 exited but we still haven't been able to report it to GDB, we'll
1415 hold on to the last lwp of the dead process. */
1422 /* Return 1 if this lwp still has an interesting status pending. If
1423 not (e.g., it had stopped for a breakpoint that is gone), return
1427 thread_still_has_status_pending_p (struct thread_info
*thread
)
1429 struct lwp_info
*lp
= get_thread_lwp (thread
);
1431 if (!lp
->status_pending_p
)
1434 /* If we got a `vCont;t', but we haven't reported a stop yet, do
1435 report any status pending the LWP may have. */
1436 if (thread
->last_resume_kind
== resume_stop
1437 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
1440 if (thread
->last_resume_kind
!= resume_stop
1441 && (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1442 || lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
1444 struct thread_info
*saved_thread
;
1448 gdb_assert (lp
->last_status
!= 0);
1452 saved_thread
= current_thread
;
1453 current_thread
= thread
;
1455 if (pc
!= lp
->stop_pc
)
1458 debug_printf ("PC of %ld changed\n",
1463 #if !USE_SIGTRAP_SIGINFO
1464 else if (lp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
1465 && !(*the_low_target
.breakpoint_at
) (pc
))
1468 debug_printf ("previous SW breakpoint of %ld gone\n",
1472 else if (lp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
1473 && !hardware_breakpoint_inserted_here (pc
))
1476 debug_printf ("previous HW breakpoint of %ld gone\n",
1482 current_thread
= saved_thread
;
1487 debug_printf ("discarding pending breakpoint status\n");
1488 lp
->status_pending_p
= 0;
1496 /* Return 1 if this lwp has an interesting status pending. */
1498 status_pending_p_callback (struct inferior_list_entry
*entry
, void *arg
)
1500 struct thread_info
*thread
= (struct thread_info
*) entry
;
1501 struct lwp_info
*lp
= get_thread_lwp (thread
);
1502 ptid_t ptid
= * (ptid_t
*) arg
;
1504 /* Check if we're only interested in events from a specific process
1505 or a specific LWP. */
1506 if (!ptid_match (ptid_of (thread
), ptid
))
1509 if (lp
->status_pending_p
1510 && !thread_still_has_status_pending_p (thread
))
1512 linux_resume_one_lwp (lp
, lp
->stepping
, GDB_SIGNAL_0
, NULL
);
1516 return lp
->status_pending_p
;
1520 same_lwp (struct inferior_list_entry
*entry
, void *data
)
1522 ptid_t ptid
= *(ptid_t
*) data
;
1525 if (ptid_get_lwp (ptid
) != 0)
1526 lwp
= ptid_get_lwp (ptid
);
1528 lwp
= ptid_get_pid (ptid
);
1530 if (ptid_get_lwp (entry
->id
) == lwp
)
1537 find_lwp_pid (ptid_t ptid
)
1539 struct inferior_list_entry
*thread
1540 = find_inferior (&all_threads
, same_lwp
, &ptid
);
1545 return get_thread_lwp ((struct thread_info
*) thread
);
1548 /* Return the number of known LWPs in the tgid given by PID. */
1553 struct inferior_list_entry
*inf
, *tmp
;
1556 ALL_INFERIORS (&all_threads
, inf
, tmp
)
1558 if (ptid_get_pid (inf
->id
) == pid
)
1565 /* The arguments passed to iterate_over_lwps. */
1567 struct iterate_over_lwps_args
1569 /* The FILTER argument passed to iterate_over_lwps. */
1572 /* The CALLBACK argument passed to iterate_over_lwps. */
1573 iterate_over_lwps_ftype
*callback
;
1575 /* The DATA argument passed to iterate_over_lwps. */
1579 /* Callback for find_inferior used by iterate_over_lwps to filter
1580 calls to the callback supplied to that function. Returning a
1581 nonzero value causes find_inferiors to stop iterating and return
1582 the current inferior_list_entry. Returning zero indicates that
1583 find_inferiors should continue iterating. */
1586 iterate_over_lwps_filter (struct inferior_list_entry
*entry
, void *args_p
)
1588 struct iterate_over_lwps_args
*args
1589 = (struct iterate_over_lwps_args
*) args_p
;
1591 if (ptid_match (entry
->id
, args
->filter
))
1593 struct thread_info
*thr
= (struct thread_info
*) entry
;
1594 struct lwp_info
*lwp
= get_thread_lwp (thr
);
1596 return (*args
->callback
) (lwp
, args
->data
);
1602 /* See nat/linux-nat.h. */
1605 iterate_over_lwps (ptid_t filter
,
1606 iterate_over_lwps_ftype callback
,
1609 struct iterate_over_lwps_args args
= {filter
, callback
, data
};
1610 struct inferior_list_entry
*entry
;
1612 entry
= find_inferior (&all_threads
, iterate_over_lwps_filter
, &args
);
1616 return get_thread_lwp ((struct thread_info
*) entry
);
1619 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1620 their exits until all other threads in the group have exited. */
1623 check_zombie_leaders (void)
1625 struct process_info
*proc
, *tmp
;
1627 ALL_PROCESSES (proc
, tmp
)
1629 pid_t leader_pid
= pid_of (proc
);
1630 struct lwp_info
*leader_lp
;
1632 leader_lp
= find_lwp_pid (pid_to_ptid (leader_pid
));
1635 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1636 "num_lwps=%d, zombie=%d\n",
1637 leader_pid
, leader_lp
!= NULL
, num_lwps (leader_pid
),
1638 linux_proc_pid_is_zombie (leader_pid
));
1640 if (leader_lp
!= NULL
1641 /* Check if there are other threads in the group, as we may
1642 have raced with the inferior simply exiting. */
1643 && !last_thread_of_process_p (leader_pid
)
1644 && linux_proc_pid_is_zombie (leader_pid
))
1646 /* A leader zombie can mean one of two things:
1648 - It exited, and there's an exit status pending
1649 available, or only the leader exited (not the whole
1650 program). In the latter case, we can't waitpid the
1651 leader's exit status until all other threads are gone.
1653 - There are 3 or more threads in the group, and a thread
1654 other than the leader exec'd. On an exec, the Linux
1655 kernel destroys all other threads (except the execing
1656 one) in the thread group, and resets the execing thread's
1657 tid to the tgid. No exit notification is sent for the
1658 execing thread -- from the ptracer's perspective, it
1659 appears as though the execing thread just vanishes.
1660 Until we reap all other threads except the leader and the
1661 execing thread, the leader will be zombie, and the
1662 execing thread will be in `D (disc sleep)'. As soon as
1663 all other threads are reaped, the execing thread changes
1664 it's tid to the tgid, and the previous (zombie) leader
1665 vanishes, giving place to the "new" leader. We could try
1666 distinguishing the exit and exec cases, by waiting once
1667 more, and seeing if something comes out, but it doesn't
1668 sound useful. The previous leader _does_ go away, and
1669 we'll re-add the new one once we see the exec event
1670 (which is just the same as what would happen if the
1671 previous leader did exit voluntarily before some other
1676 "CZL: Thread group leader %d zombie "
1677 "(it exited, or another thread execd).\n",
1680 delete_lwp (leader_lp
);
1685 /* Callback for `find_inferior'. Returns the first LWP that is not
1686 stopped. ARG is a PTID filter. */
1689 not_stopped_callback (struct inferior_list_entry
*entry
, void *arg
)
1691 struct thread_info
*thr
= (struct thread_info
*) entry
;
1692 struct lwp_info
*lwp
;
1693 ptid_t filter
= *(ptid_t
*) arg
;
1695 if (!ptid_match (ptid_of (thr
), filter
))
1698 lwp
= get_thread_lwp (thr
);
1705 /* This function should only be called if the LWP got a SIGTRAP.
1707 Handle any tracepoint steps or hits. Return true if a tracepoint
1708 event was handled, 0 otherwise. */
1711 handle_tracepoints (struct lwp_info
*lwp
)
1713 struct thread_info
*tinfo
= get_lwp_thread (lwp
);
1714 int tpoint_related_event
= 0;
1716 gdb_assert (lwp
->suspended
== 0);
1718 /* If this tracepoint hit causes a tracing stop, we'll immediately
1719 uninsert tracepoints. To do this, we temporarily pause all
1720 threads, unpatch away, and then unpause threads. We need to make
1721 sure the unpausing doesn't resume LWP too. */
1724 /* And we need to be sure that any all-threads-stopping doesn't try
1725 to move threads out of the jump pads, as it could deadlock the
1726 inferior (LWP could be in the jump pad, maybe even holding the
1729 /* Do any necessary step collect actions. */
1730 tpoint_related_event
|= tracepoint_finished_step (tinfo
, lwp
->stop_pc
);
1732 tpoint_related_event
|= handle_tracepoint_bkpts (tinfo
, lwp
->stop_pc
);
1734 /* See if we just hit a tracepoint and do its main collect
1736 tpoint_related_event
|= tracepoint_was_hit (tinfo
, lwp
->stop_pc
);
1740 gdb_assert (lwp
->suspended
== 0);
1741 gdb_assert (!stabilizing_threads
|| lwp
->collecting_fast_tracepoint
);
1743 if (tpoint_related_event
)
1746 debug_printf ("got a tracepoint event\n");
1753 /* Convenience wrapper. Returns true if LWP is presently collecting a
1757 linux_fast_tracepoint_collecting (struct lwp_info
*lwp
,
1758 struct fast_tpoint_collect_status
*status
)
1760 CORE_ADDR thread_area
;
1761 struct thread_info
*thread
= get_lwp_thread (lwp
);
1763 if (the_low_target
.get_thread_area
== NULL
)
1766 /* Get the thread area address. This is used to recognize which
1767 thread is which when tracing with the in-process agent library.
1768 We don't read anything from the address, and treat it as opaque;
1769 it's the address itself that we assume is unique per-thread. */
1770 if ((*the_low_target
.get_thread_area
) (lwpid_of (thread
), &thread_area
) == -1)
1773 return fast_tracepoint_collecting (thread_area
, lwp
->stop_pc
, status
);
1776 /* The reason we resume in the caller, is because we want to be able
1777 to pass lwp->status_pending as WSTAT, and we need to clear
1778 status_pending_p before resuming, otherwise, linux_resume_one_lwp
1779 refuses to resume. */
1782 maybe_move_out_of_jump_pad (struct lwp_info
*lwp
, int *wstat
)
1784 struct thread_info
*saved_thread
;
1786 saved_thread
= current_thread
;
1787 current_thread
= get_lwp_thread (lwp
);
1790 || (WIFSTOPPED (*wstat
) && WSTOPSIG (*wstat
) != SIGTRAP
))
1791 && supports_fast_tracepoints ()
1792 && agent_loaded_p ())
1794 struct fast_tpoint_collect_status status
;
1798 debug_printf ("Checking whether LWP %ld needs to move out of the "
1800 lwpid_of (current_thread
));
1802 r
= linux_fast_tracepoint_collecting (lwp
, &status
);
1805 || (WSTOPSIG (*wstat
) != SIGILL
1806 && WSTOPSIG (*wstat
) != SIGFPE
1807 && WSTOPSIG (*wstat
) != SIGSEGV
1808 && WSTOPSIG (*wstat
) != SIGBUS
))
1810 lwp
->collecting_fast_tracepoint
= r
;
1814 if (r
== 1 && lwp
->exit_jump_pad_bkpt
== NULL
)
1816 /* Haven't executed the original instruction yet.
1817 Set breakpoint there, and wait till it's hit,
1818 then single-step until exiting the jump pad. */
1819 lwp
->exit_jump_pad_bkpt
1820 = set_breakpoint_at (status
.adjusted_insn_addr
, NULL
);
1824 debug_printf ("Checking whether LWP %ld needs to move out of "
1825 "the jump pad...it does\n",
1826 lwpid_of (current_thread
));
1827 current_thread
= saved_thread
;
1834 /* If we get a synchronous signal while collecting, *and*
1835 while executing the (relocated) original instruction,
1836 reset the PC to point at the tpoint address, before
1837 reporting to GDB. Otherwise, it's an IPA lib bug: just
1838 report the signal to GDB, and pray for the best. */
1840 lwp
->collecting_fast_tracepoint
= 0;
1843 && (status
.adjusted_insn_addr
<= lwp
->stop_pc
1844 && lwp
->stop_pc
< status
.adjusted_insn_addr_end
))
1847 struct regcache
*regcache
;
1849 /* The si_addr on a few signals references the address
1850 of the faulting instruction. Adjust that as
1852 if ((WSTOPSIG (*wstat
) == SIGILL
1853 || WSTOPSIG (*wstat
) == SIGFPE
1854 || WSTOPSIG (*wstat
) == SIGBUS
1855 || WSTOPSIG (*wstat
) == SIGSEGV
)
1856 && ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
1857 (PTRACE_TYPE_ARG3
) 0, &info
) == 0
1858 /* Final check just to make sure we don't clobber
1859 the siginfo of non-kernel-sent signals. */
1860 && (uintptr_t) info
.si_addr
== lwp
->stop_pc
)
1862 info
.si_addr
= (void *) (uintptr_t) status
.tpoint_addr
;
1863 ptrace (PTRACE_SETSIGINFO
, lwpid_of (current_thread
),
1864 (PTRACE_TYPE_ARG3
) 0, &info
);
1867 regcache
= get_thread_regcache (current_thread
, 1);
1868 (*the_low_target
.set_pc
) (regcache
, status
.tpoint_addr
);
1869 lwp
->stop_pc
= status
.tpoint_addr
;
1871 /* Cancel any fast tracepoint lock this thread was
1873 force_unlock_trace_buffer ();
1876 if (lwp
->exit_jump_pad_bkpt
!= NULL
)
1879 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
1880 "stopping all threads momentarily.\n");
1882 stop_all_lwps (1, lwp
);
1884 delete_breakpoint (lwp
->exit_jump_pad_bkpt
);
1885 lwp
->exit_jump_pad_bkpt
= NULL
;
1887 unstop_all_lwps (1, lwp
);
1889 gdb_assert (lwp
->suspended
>= 0);
1895 debug_printf ("Checking whether LWP %ld needs to move out of the "
1897 lwpid_of (current_thread
));
1899 current_thread
= saved_thread
;
1903 /* Enqueue one signal in the "signals to report later when out of the
1907 enqueue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1909 struct pending_signals
*p_sig
;
1910 struct thread_info
*thread
= get_lwp_thread (lwp
);
1913 debug_printf ("Deferring signal %d for LWP %ld.\n",
1914 WSTOPSIG (*wstat
), lwpid_of (thread
));
1918 struct pending_signals
*sig
;
1920 for (sig
= lwp
->pending_signals_to_report
;
1923 debug_printf (" Already queued %d\n",
1926 debug_printf (" (no more currently queued signals)\n");
1929 /* Don't enqueue non-RT signals if they are already in the deferred
1930 queue. (SIGSTOP being the easiest signal to see ending up here
1932 if (WSTOPSIG (*wstat
) < __SIGRTMIN
)
1934 struct pending_signals
*sig
;
1936 for (sig
= lwp
->pending_signals_to_report
;
1940 if (sig
->signal
== WSTOPSIG (*wstat
))
1943 debug_printf ("Not requeuing already queued non-RT signal %d"
1952 p_sig
= xmalloc (sizeof (*p_sig
));
1953 p_sig
->prev
= lwp
->pending_signals_to_report
;
1954 p_sig
->signal
= WSTOPSIG (*wstat
);
1955 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
1956 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1959 lwp
->pending_signals_to_report
= p_sig
;
1962 /* Dequeue one signal from the "signals to report later when out of
1963 the jump pad" list. */
1966 dequeue_one_deferred_signal (struct lwp_info
*lwp
, int *wstat
)
1968 struct thread_info
*thread
= get_lwp_thread (lwp
);
1970 if (lwp
->pending_signals_to_report
!= NULL
)
1972 struct pending_signals
**p_sig
;
1974 p_sig
= &lwp
->pending_signals_to_report
;
1975 while ((*p_sig
)->prev
!= NULL
)
1976 p_sig
= &(*p_sig
)->prev
;
1978 *wstat
= W_STOPCODE ((*p_sig
)->signal
);
1979 if ((*p_sig
)->info
.si_signo
!= 0)
1980 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
1986 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
1987 WSTOPSIG (*wstat
), lwpid_of (thread
));
1991 struct pending_signals
*sig
;
1993 for (sig
= lwp
->pending_signals_to_report
;
1996 debug_printf (" Still queued %d\n",
1999 debug_printf (" (no more queued signals)\n");
2008 /* Fetch the possibly triggered data watchpoint info and store it in
2011 On some archs, like x86, that use debug registers to set
2012 watchpoints, it's possible that the way to know which watched
2013 address trapped, is to check the register that is used to select
2014 which address to watch. Problem is, between setting the watchpoint
2015 and reading back which data address trapped, the user may change
2016 the set of watchpoints, and, as a consequence, GDB changes the
2017 debug registers in the inferior. To avoid reading back a stale
2018 stopped-data-address when that happens, we cache in LP the fact
2019 that a watchpoint trapped, and the corresponding data address, as
2020 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2021 registers meanwhile, we have the cached data we can rely on. */
2024 check_stopped_by_watchpoint (struct lwp_info
*child
)
2026 if (the_low_target
.stopped_by_watchpoint
!= NULL
)
2028 struct thread_info
*saved_thread
;
2030 saved_thread
= current_thread
;
2031 current_thread
= get_lwp_thread (child
);
2033 if (the_low_target
.stopped_by_watchpoint ())
2035 child
->stop_reason
= TARGET_STOPPED_BY_WATCHPOINT
;
2037 if (the_low_target
.stopped_data_address
!= NULL
)
2038 child
->stopped_data_address
2039 = the_low_target
.stopped_data_address ();
2041 child
->stopped_data_address
= 0;
2044 current_thread
= saved_thread
;
2047 return child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
2050 /* Return the ptrace options that we want to try to enable. */
2053 linux_low_ptrace_options (int attached
)
2058 options
|= PTRACE_O_EXITKILL
;
2060 if (report_fork_events
)
2061 options
|= PTRACE_O_TRACEFORK
;
2063 if (report_vfork_events
)
2064 options
|= (PTRACE_O_TRACEVFORK
| PTRACE_O_TRACEVFORKDONE
);
2069 /* Do low-level handling of the event, and check if we should go on
2070 and pass it to caller code. Return the affected lwp if we are, or
2073 static struct lwp_info
*
2074 linux_low_filter_event (int lwpid
, int wstat
)
2076 struct lwp_info
*child
;
2077 struct thread_info
*thread
;
2078 int have_stop_pc
= 0;
2080 child
= find_lwp_pid (pid_to_ptid (lwpid
));
2082 /* If we didn't find a process, one of two things presumably happened:
2083 - A process we started and then detached from has exited. Ignore it.
2084 - A process we are controlling has forked and the new child's stop
2085 was reported to us by the kernel. Save its PID. */
2086 if (child
== NULL
&& WIFSTOPPED (wstat
))
2088 add_to_pid_list (&stopped_pids
, lwpid
, wstat
);
2091 else if (child
== NULL
)
2094 thread
= get_lwp_thread (child
);
2098 child
->last_status
= wstat
;
2100 /* Check if the thread has exited. */
2101 if ((WIFEXITED (wstat
) || WIFSIGNALED (wstat
)))
2104 debug_printf ("LLFE: %d exited.\n", lwpid
);
2105 if (num_lwps (pid_of (thread
)) > 1)
2108 /* If there is at least one more LWP, then the exit signal was
2109 not the end of the debugged application and should be
2116 /* This was the last lwp in the process. Since events are
2117 serialized to GDB core, and we can't report this one
2118 right now, but GDB core and the other target layers will
2119 want to be notified about the exit code/signal, leave the
2120 status pending for the next time we're able to report
2122 mark_lwp_dead (child
, wstat
);
2127 gdb_assert (WIFSTOPPED (wstat
));
2129 if (WIFSTOPPED (wstat
))
2131 struct process_info
*proc
;
2133 /* Architecture-specific setup after inferior is running. This
2134 needs to happen after we have attached to the inferior and it
2135 is stopped for the first time, but before we access any
2136 inferior registers. */
2137 proc
= find_process_pid (pid_of (thread
));
2138 if (proc
->priv
->new_inferior
)
2140 struct thread_info
*saved_thread
;
2142 saved_thread
= current_thread
;
2143 current_thread
= thread
;
2145 the_low_target
.arch_setup ();
2147 current_thread
= saved_thread
;
2149 proc
->priv
->new_inferior
= 0;
2153 if (WIFSTOPPED (wstat
) && child
->must_set_ptrace_flags
)
2155 struct process_info
*proc
= find_process_pid (pid_of (thread
));
2156 int options
= linux_low_ptrace_options (proc
->attached
);
2158 linux_enable_event_reporting (lwpid
, options
);
2159 child
->must_set_ptrace_flags
= 0;
2162 /* Be careful to not overwrite stop_pc until
2163 check_stopped_by_breakpoint is called. */
2164 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2165 && linux_is_extended_waitstatus (wstat
))
2167 child
->stop_pc
= get_pc (child
);
2168 if (handle_extended_wait (child
, wstat
))
2170 /* The event has been handled, so just return without
2176 /* Check first whether this was a SW/HW breakpoint before checking
2177 watchpoints, because at least s390 can't tell the data address of
2178 hardware watchpoint hits, and returns stopped-by-watchpoint as
2179 long as there's a watchpoint set. */
2180 if (WIFSTOPPED (wstat
) && linux_wstatus_maybe_breakpoint (wstat
))
2182 if (check_stopped_by_breakpoint (child
))
2186 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2187 or hardware watchpoint. Check which is which if we got
2188 TARGET_STOPPED_BY_HW_BREAKPOINT. */
2189 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGTRAP
2190 && (child
->stop_reason
== TARGET_STOPPED_BY_NO_REASON
2191 || child
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
))
2192 check_stopped_by_watchpoint (child
);
2195 child
->stop_pc
= get_pc (child
);
2197 if (WIFSTOPPED (wstat
) && WSTOPSIG (wstat
) == SIGSTOP
2198 && child
->stop_expected
)
2201 debug_printf ("Expected stop.\n");
2202 child
->stop_expected
= 0;
2204 if (thread
->last_resume_kind
== resume_stop
)
2206 /* We want to report the stop to the core. Treat the
2207 SIGSTOP as a normal event. */
2209 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2210 target_pid_to_str (ptid_of (thread
)));
2212 else if (stopping_threads
!= NOT_STOPPING_THREADS
)
2214 /* Stopping threads. We don't want this SIGSTOP to end up
2217 debug_printf ("LLW: SIGSTOP caught for %s "
2218 "while stopping threads.\n",
2219 target_pid_to_str (ptid_of (thread
)));
2224 /* This is a delayed SIGSTOP. Filter out the event. */
2226 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2227 child
->stepping
? "step" : "continue",
2228 target_pid_to_str (ptid_of (thread
)));
2230 linux_resume_one_lwp (child
, child
->stepping
, 0, NULL
);
2235 child
->status_pending_p
= 1;
2236 child
->status_pending
= wstat
;
2240 /* Resume LWPs that are currently stopped without any pending status
2241 to report, but are resumed from the core's perspective. */
2244 resume_stopped_resumed_lwps (struct inferior_list_entry
*entry
)
2246 struct thread_info
*thread
= (struct thread_info
*) entry
;
2247 struct lwp_info
*lp
= get_thread_lwp (thread
);
2250 && !lp
->status_pending_p
2251 && thread
->last_resume_kind
!= resume_stop
2252 && thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
)
2254 int step
= thread
->last_resume_kind
== resume_step
;
2257 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2258 target_pid_to_str (ptid_of (thread
)),
2259 paddress (lp
->stop_pc
),
2262 linux_resume_one_lwp (lp
, step
, GDB_SIGNAL_0
, NULL
);
2266 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2267 match FILTER_PTID (leaving others pending). The PTIDs can be:
2268 minus_one_ptid, to specify any child; a pid PTID, specifying all
2269 lwps of a thread group; or a PTID representing a single lwp. Store
2270 the stop status through the status pointer WSTAT. OPTIONS is
2271 passed to the waitpid call. Return 0 if no event was found and
2272 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2273 was found. Return the PID of the stopped child otherwise. */
2276 linux_wait_for_event_filtered (ptid_t wait_ptid
, ptid_t filter_ptid
,
2277 int *wstatp
, int options
)
2279 struct thread_info
*event_thread
;
2280 struct lwp_info
*event_child
, *requested_child
;
2281 sigset_t block_mask
, prev_mask
;
2284 /* N.B. event_thread points to the thread_info struct that contains
2285 event_child. Keep them in sync. */
2286 event_thread
= NULL
;
2288 requested_child
= NULL
;
2290 /* Check for a lwp with a pending status. */
2292 if (ptid_equal (filter_ptid
, minus_one_ptid
) || ptid_is_pid (filter_ptid
))
2294 event_thread
= (struct thread_info
*)
2295 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2296 if (event_thread
!= NULL
)
2297 event_child
= get_thread_lwp (event_thread
);
2298 if (debug_threads
&& event_thread
)
2299 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread
));
2301 else if (!ptid_equal (filter_ptid
, null_ptid
))
2303 requested_child
= find_lwp_pid (filter_ptid
);
2305 if (stopping_threads
== NOT_STOPPING_THREADS
2306 && requested_child
->status_pending_p
2307 && requested_child
->collecting_fast_tracepoint
)
2309 enqueue_one_deferred_signal (requested_child
,
2310 &requested_child
->status_pending
);
2311 requested_child
->status_pending_p
= 0;
2312 requested_child
->status_pending
= 0;
2313 linux_resume_one_lwp (requested_child
, 0, 0, NULL
);
2316 if (requested_child
->suspended
2317 && requested_child
->status_pending_p
)
2319 internal_error (__FILE__
, __LINE__
,
2320 "requesting an event out of a"
2321 " suspended child?");
2324 if (requested_child
->status_pending_p
)
2326 event_child
= requested_child
;
2327 event_thread
= get_lwp_thread (event_child
);
2331 if (event_child
!= NULL
)
2334 debug_printf ("Got an event from pending child %ld (%04x)\n",
2335 lwpid_of (event_thread
), event_child
->status_pending
);
2336 *wstatp
= event_child
->status_pending
;
2337 event_child
->status_pending_p
= 0;
2338 event_child
->status_pending
= 0;
2339 current_thread
= event_thread
;
2340 return lwpid_of (event_thread
);
2343 /* But if we don't find a pending event, we'll have to wait.
2345 We only enter this loop if no process has a pending wait status.
2346 Thus any action taken in response to a wait status inside this
2347 loop is responding as soon as we detect the status, not after any
2350 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2351 all signals while here. */
2352 sigfillset (&block_mask
);
2353 sigprocmask (SIG_BLOCK
, &block_mask
, &prev_mask
);
2355 /* Always pull all events out of the kernel. We'll randomly select
2356 an event LWP out of all that have events, to prevent
2358 while (event_child
== NULL
)
2362 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2365 - If the thread group leader exits while other threads in the
2366 thread group still exist, waitpid(TGID, ...) hangs. That
2367 waitpid won't return an exit status until the other threads
2368 in the group are reaped.
2370 - When a non-leader thread execs, that thread just vanishes
2371 without reporting an exit (so we'd hang if we waited for it
2372 explicitly in that case). The exec event is reported to
2373 the TGID pid (although we don't currently enable exec
2376 ret
= my_waitpid (-1, wstatp
, options
| WNOHANG
);
2379 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2380 ret
, errno
? strerror (errno
) : "ERRNO-OK");
2386 debug_printf ("LLW: waitpid %ld received %s\n",
2387 (long) ret
, status_to_str (*wstatp
));
2390 /* Filter all events. IOW, leave all events pending. We'll
2391 randomly select an event LWP out of all that have events
2393 linux_low_filter_event (ret
, *wstatp
);
2394 /* Retry until nothing comes out of waitpid. A single
2395 SIGCHLD can indicate more than one child stopped. */
2399 /* Now that we've pulled all events out of the kernel, resume
2400 LWPs that don't have an interesting event to report. */
2401 if (stopping_threads
== NOT_STOPPING_THREADS
)
2402 for_each_inferior (&all_threads
, resume_stopped_resumed_lwps
);
2404 /* ... and find an LWP with a status to report to the core, if
2406 event_thread
= (struct thread_info
*)
2407 find_inferior (&all_threads
, status_pending_p_callback
, &filter_ptid
);
2408 if (event_thread
!= NULL
)
2410 event_child
= get_thread_lwp (event_thread
);
2411 *wstatp
= event_child
->status_pending
;
2412 event_child
->status_pending_p
= 0;
2413 event_child
->status_pending
= 0;
2417 /* Check for zombie thread group leaders. Those can't be reaped
2418 until all other threads in the thread group are. */
2419 check_zombie_leaders ();
2421 /* If there are no resumed children left in the set of LWPs we
2422 want to wait for, bail. We can't just block in
2423 waitpid/sigsuspend, because lwps might have been left stopped
2424 in trace-stop state, and we'd be stuck forever waiting for
2425 their status to change (which would only happen if we resumed
2426 them). Even if WNOHANG is set, this return code is preferred
2427 over 0 (below), as it is more detailed. */
2428 if ((find_inferior (&all_threads
,
2429 not_stopped_callback
,
2430 &wait_ptid
) == NULL
))
2433 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2434 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2438 /* No interesting event to report to the caller. */
2439 if ((options
& WNOHANG
))
2442 debug_printf ("WNOHANG set, no event found\n");
2444 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2448 /* Block until we get an event reported with SIGCHLD. */
2450 debug_printf ("sigsuspend'ing\n");
2452 sigsuspend (&prev_mask
);
2453 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2457 sigprocmask (SIG_SETMASK
, &prev_mask
, NULL
);
2459 current_thread
= event_thread
;
2461 /* Check for thread exit. */
2462 if (! WIFSTOPPED (*wstatp
))
2464 gdb_assert (last_thread_of_process_p (pid_of (event_thread
)));
2467 debug_printf ("LWP %d is the last lwp of process. "
2468 "Process %ld exiting.\n",
2469 pid_of (event_thread
), lwpid_of (event_thread
));
2470 return lwpid_of (event_thread
);
2473 return lwpid_of (event_thread
);
2476 /* Wait for an event from child(ren) PTID. PTIDs can be:
2477 minus_one_ptid, to specify any child; a pid PTID, specifying all
2478 lwps of a thread group; or a PTID representing a single lwp. Store
2479 the stop status through the status pointer WSTAT. OPTIONS is
2480 passed to the waitpid call. Return 0 if no event was found and
2481 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2482 was found. Return the PID of the stopped child otherwise. */
2485 linux_wait_for_event (ptid_t ptid
, int *wstatp
, int options
)
2487 return linux_wait_for_event_filtered (ptid
, ptid
, wstatp
, options
);
2490 /* Count the LWP's that have had events. */
2493 count_events_callback (struct inferior_list_entry
*entry
, void *data
)
2495 struct thread_info
*thread
= (struct thread_info
*) entry
;
2496 struct lwp_info
*lp
= get_thread_lwp (thread
);
2499 gdb_assert (count
!= NULL
);
2501 /* Count only resumed LWPs that have an event pending. */
2502 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2503 && lp
->status_pending_p
)
2509 /* Select the LWP (if any) that is currently being single-stepped. */
2512 select_singlestep_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2514 struct thread_info
*thread
= (struct thread_info
*) entry
;
2515 struct lwp_info
*lp
= get_thread_lwp (thread
);
2517 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2518 && thread
->last_resume_kind
== resume_step
2519 && lp
->status_pending_p
)
2525 /* Select the Nth LWP that has had an event. */
2528 select_event_lwp_callback (struct inferior_list_entry
*entry
, void *data
)
2530 struct thread_info
*thread
= (struct thread_info
*) entry
;
2531 struct lwp_info
*lp
= get_thread_lwp (thread
);
2532 int *selector
= data
;
2534 gdb_assert (selector
!= NULL
);
2536 /* Select only resumed LWPs that have an event pending. */
2537 if (thread
->last_status
.kind
== TARGET_WAITKIND_IGNORE
2538 && lp
->status_pending_p
)
2539 if ((*selector
)-- == 0)
2545 /* Select one LWP out of those that have events pending. */
2548 select_event_lwp (struct lwp_info
**orig_lp
)
2551 int random_selector
;
2552 struct thread_info
*event_thread
= NULL
;
2554 /* In all-stop, give preference to the LWP that is being
2555 single-stepped. There will be at most one, and it's the LWP that
2556 the core is most interested in. If we didn't do this, then we'd
2557 have to handle pending step SIGTRAPs somehow in case the core
2558 later continues the previously-stepped thread, otherwise we'd
2559 report the pending SIGTRAP, and the core, not having stepped the
2560 thread, wouldn't understand what the trap was for, and therefore
2561 would report it to the user as a random signal. */
2565 = (struct thread_info
*) find_inferior (&all_threads
,
2566 select_singlestep_lwp_callback
,
2568 if (event_thread
!= NULL
)
2571 debug_printf ("SEL: Select single-step %s\n",
2572 target_pid_to_str (ptid_of (event_thread
)));
2575 if (event_thread
== NULL
)
2577 /* No single-stepping LWP. Select one at random, out of those
2578 which have had events. */
2580 /* First see how many events we have. */
2581 find_inferior (&all_threads
, count_events_callback
, &num_events
);
2582 gdb_assert (num_events
> 0);
2584 /* Now randomly pick a LWP out of those that have had
2586 random_selector
= (int)
2587 ((num_events
* (double) rand ()) / (RAND_MAX
+ 1.0));
2589 if (debug_threads
&& num_events
> 1)
2590 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2591 num_events
, random_selector
);
2594 = (struct thread_info
*) find_inferior (&all_threads
,
2595 select_event_lwp_callback
,
2599 if (event_thread
!= NULL
)
2601 struct lwp_info
*event_lp
= get_thread_lwp (event_thread
);
2603 /* Switch the event LWP. */
2604 *orig_lp
= event_lp
;
2608 /* Decrement the suspend count of an LWP. */
2611 unsuspend_one_lwp (struct inferior_list_entry
*entry
, void *except
)
2613 struct thread_info
*thread
= (struct thread_info
*) entry
;
2614 struct lwp_info
*lwp
= get_thread_lwp (thread
);
2616 /* Ignore EXCEPT. */
2622 gdb_assert (lwp
->suspended
>= 0);
2626 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2630 unsuspend_all_lwps (struct lwp_info
*except
)
2632 find_inferior (&all_threads
, unsuspend_one_lwp
, except
);
2635 static void move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
);
2636 static int stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
,
2638 static int lwp_running (struct inferior_list_entry
*entry
, void *data
);
2639 static ptid_t
linux_wait_1 (ptid_t ptid
,
2640 struct target_waitstatus
*ourstatus
,
2641 int target_options
);
2643 /* Stabilize threads (move out of jump pads).
2645 If a thread is midway collecting a fast tracepoint, we need to
2646 finish the collection and move it out of the jump pad before
2647 reporting the signal.
2649 This avoids recursion while collecting (when a signal arrives
2650 midway, and the signal handler itself collects), which would trash
2651 the trace buffer. In case the user set a breakpoint in a signal
2652 handler, this avoids the backtrace showing the jump pad, etc..
2653 Most importantly, there are certain things we can't do safely if
2654 threads are stopped in a jump pad (or in its callee's). For
2657 - starting a new trace run. A thread still collecting the
2658 previous run, could trash the trace buffer when resumed. The trace
2659 buffer control structures would have been reset but the thread had
2660 no way to tell. The thread could even midway memcpy'ing to the
2661 buffer, which would mean that when resumed, it would clobber the
2662 trace buffer that had been set for a new run.
2664 - we can't rewrite/reuse the jump pads for new tracepoints
2665 safely. Say you do tstart while a thread is stopped midway while
2666 collecting. When the thread is later resumed, it finishes the
2667 collection, and returns to the jump pad, to execute the original
2668 instruction that was under the tracepoint jump at the time the
2669 older run had been started. If the jump pad had been rewritten
2670 since for something else in the new run, the thread would now
2671 execute the wrong / random instructions. */
2674 linux_stabilize_threads (void)
2676 struct thread_info
*saved_thread
;
2677 struct thread_info
*thread_stuck
;
2680 = (struct thread_info
*) find_inferior (&all_threads
,
2681 stuck_in_jump_pad_callback
,
2683 if (thread_stuck
!= NULL
)
2686 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2687 lwpid_of (thread_stuck
));
2691 saved_thread
= current_thread
;
2693 stabilizing_threads
= 1;
2696 for_each_inferior (&all_threads
, move_out_of_jump_pad_callback
);
2698 /* Loop until all are stopped out of the jump pads. */
2699 while (find_inferior (&all_threads
, lwp_running
, NULL
) != NULL
)
2701 struct target_waitstatus ourstatus
;
2702 struct lwp_info
*lwp
;
2705 /* Note that we go through the full wait even loop. While
2706 moving threads out of jump pad, we need to be able to step
2707 over internal breakpoints and such. */
2708 linux_wait_1 (minus_one_ptid
, &ourstatus
, 0);
2710 if (ourstatus
.kind
== TARGET_WAITKIND_STOPPED
)
2712 lwp
= get_thread_lwp (current_thread
);
2717 if (ourstatus
.value
.sig
!= GDB_SIGNAL_0
2718 || current_thread
->last_resume_kind
== resume_stop
)
2720 wstat
= W_STOPCODE (gdb_signal_to_host (ourstatus
.value
.sig
));
2721 enqueue_one_deferred_signal (lwp
, &wstat
);
2726 find_inferior (&all_threads
, unsuspend_one_lwp
, NULL
);
2728 stabilizing_threads
= 0;
2730 current_thread
= saved_thread
;
2735 = (struct thread_info
*) find_inferior (&all_threads
,
2736 stuck_in_jump_pad_callback
,
2738 if (thread_stuck
!= NULL
)
2739 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
2740 lwpid_of (thread_stuck
));
2744 static void async_file_mark (void);
2746 /* Convenience function that is called when the kernel reports an
2747 event that is not passed out to GDB. */
2750 ignore_event (struct target_waitstatus
*ourstatus
)
2752 /* If we got an event, there may still be others, as a single
2753 SIGCHLD can indicate more than one child stopped. This forces
2754 another target_wait call. */
2757 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2761 /* Return non-zero if WAITSTATUS reflects an extended linux
2762 event. Otherwise, return zero. */
2765 extended_event_reported (const struct target_waitstatus
*waitstatus
)
2767 if (waitstatus
== NULL
)
2770 return (waitstatus
->kind
== TARGET_WAITKIND_FORKED
2771 || waitstatus
->kind
== TARGET_WAITKIND_VFORKED
2772 || waitstatus
->kind
== TARGET_WAITKIND_VFORK_DONE
);
2775 /* Wait for process, returns status. */
2778 linux_wait_1 (ptid_t ptid
,
2779 struct target_waitstatus
*ourstatus
, int target_options
)
2782 struct lwp_info
*event_child
;
2785 int step_over_finished
;
2786 int bp_explains_trap
;
2787 int maybe_internal_trap
;
2795 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid
));
2798 /* Translate generic target options into linux options. */
2800 if (target_options
& TARGET_WNOHANG
)
2803 bp_explains_trap
= 0;
2806 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2808 if (ptid_equal (step_over_bkpt
, null_ptid
))
2809 pid
= linux_wait_for_event (ptid
, &w
, options
);
2813 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
2814 target_pid_to_str (step_over_bkpt
));
2815 pid
= linux_wait_for_event (step_over_bkpt
, &w
, options
& ~WNOHANG
);
2820 gdb_assert (target_options
& TARGET_WNOHANG
);
2824 debug_printf ("linux_wait_1 ret = null_ptid, "
2825 "TARGET_WAITKIND_IGNORE\n");
2829 ourstatus
->kind
= TARGET_WAITKIND_IGNORE
;
2836 debug_printf ("linux_wait_1 ret = null_ptid, "
2837 "TARGET_WAITKIND_NO_RESUMED\n");
2841 ourstatus
->kind
= TARGET_WAITKIND_NO_RESUMED
;
2845 event_child
= get_thread_lwp (current_thread
);
2847 /* linux_wait_for_event only returns an exit status for the last
2848 child of a process. Report it. */
2849 if (WIFEXITED (w
) || WIFSIGNALED (w
))
2853 ourstatus
->kind
= TARGET_WAITKIND_EXITED
;
2854 ourstatus
->value
.integer
= WEXITSTATUS (w
);
2858 debug_printf ("linux_wait_1 ret = %s, exited with "
2860 target_pid_to_str (ptid_of (current_thread
)),
2867 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
2868 ourstatus
->value
.sig
= gdb_signal_from_host (WTERMSIG (w
));
2872 debug_printf ("linux_wait_1 ret = %s, terminated with "
2874 target_pid_to_str (ptid_of (current_thread
)),
2880 return ptid_of (current_thread
);
2883 /* If step-over executes a breakpoint instruction, it means a
2884 gdb/gdbserver breakpoint had been planted on top of a permanent
2885 breakpoint. The PC has been adjusted by
2886 check_stopped_by_breakpoint to point at the breakpoint address.
2887 Advance the PC manually past the breakpoint, otherwise the
2888 program would keep trapping the permanent breakpoint forever. */
2889 if (!ptid_equal (step_over_bkpt
, null_ptid
)
2890 && event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
)
2892 unsigned int increment_pc
= the_low_target
.breakpoint_len
;
2896 debug_printf ("step-over for %s executed software breakpoint\n",
2897 target_pid_to_str (ptid_of (current_thread
)));
2900 if (increment_pc
!= 0)
2902 struct regcache
*regcache
2903 = get_thread_regcache (current_thread
, 1);
2905 event_child
->stop_pc
+= increment_pc
;
2906 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
2908 if (!(*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))
2909 event_child
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
2913 /* If this event was not handled before, and is not a SIGTRAP, we
2914 report it. SIGILL and SIGSEGV are also treated as traps in case
2915 a breakpoint is inserted at the current PC. If this target does
2916 not support internal breakpoints at all, we also report the
2917 SIGTRAP without further processing; it's of no concern to us. */
2919 = (supports_breakpoints ()
2920 && (WSTOPSIG (w
) == SIGTRAP
2921 || ((WSTOPSIG (w
) == SIGILL
2922 || WSTOPSIG (w
) == SIGSEGV
)
2923 && (*the_low_target
.breakpoint_at
) (event_child
->stop_pc
))));
2925 if (maybe_internal_trap
)
2927 /* Handle anything that requires bookkeeping before deciding to
2928 report the event or continue waiting. */
2930 /* First check if we can explain the SIGTRAP with an internal
2931 breakpoint, or if we should possibly report the event to GDB.
2932 Do this before anything that may remove or insert a
2934 bp_explains_trap
= breakpoint_inserted_here (event_child
->stop_pc
);
2936 /* We have a SIGTRAP, possibly a step-over dance has just
2937 finished. If so, tweak the state machine accordingly,
2938 reinsert breakpoints and delete any reinsert (software
2939 single-step) breakpoints. */
2940 step_over_finished
= finish_step_over (event_child
);
2942 /* Now invoke the callbacks of any internal breakpoints there. */
2943 check_breakpoints (event_child
->stop_pc
);
2945 /* Handle tracepoint data collecting. This may overflow the
2946 trace buffer, and cause a tracing stop, removing
2948 trace_event
= handle_tracepoints (event_child
);
2950 if (bp_explains_trap
)
2952 /* If we stepped or ran into an internal breakpoint, we've
2953 already handled it. So next time we resume (from this
2954 PC), we should step over it. */
2956 debug_printf ("Hit a gdbserver breakpoint.\n");
2958 if (breakpoint_here (event_child
->stop_pc
))
2959 event_child
->need_step_over
= 1;
2964 /* We have some other signal, possibly a step-over dance was in
2965 progress, and it should be cancelled too. */
2966 step_over_finished
= finish_step_over (event_child
);
2969 /* We have all the data we need. Either report the event to GDB, or
2970 resume threads and keep waiting for more. */
2972 /* If we're collecting a fast tracepoint, finish the collection and
2973 move out of the jump pad before delivering a signal. See
2974 linux_stabilize_threads. */
2977 && WSTOPSIG (w
) != SIGTRAP
2978 && supports_fast_tracepoints ()
2979 && agent_loaded_p ())
2982 debug_printf ("Got signal %d for LWP %ld. Check if we need "
2983 "to defer or adjust it.\n",
2984 WSTOPSIG (w
), lwpid_of (current_thread
));
2986 /* Allow debugging the jump pad itself. */
2987 if (current_thread
->last_resume_kind
!= resume_step
2988 && maybe_move_out_of_jump_pad (event_child
, &w
))
2990 enqueue_one_deferred_signal (event_child
, &w
);
2993 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
2994 WSTOPSIG (w
), lwpid_of (current_thread
));
2996 linux_resume_one_lwp (event_child
, 0, 0, NULL
);
2998 return ignore_event (ourstatus
);
3002 if (event_child
->collecting_fast_tracepoint
)
3005 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3006 "Check if we're already there.\n",
3007 lwpid_of (current_thread
),
3008 event_child
->collecting_fast_tracepoint
);
3012 event_child
->collecting_fast_tracepoint
3013 = linux_fast_tracepoint_collecting (event_child
, NULL
);
3015 if (event_child
->collecting_fast_tracepoint
!= 1)
3017 /* No longer need this breakpoint. */
3018 if (event_child
->exit_jump_pad_bkpt
!= NULL
)
3021 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3022 "stopping all threads momentarily.\n");
3024 /* Other running threads could hit this breakpoint.
3025 We don't handle moribund locations like GDB does,
3026 instead we always pause all threads when removing
3027 breakpoints, so that any step-over or
3028 decr_pc_after_break adjustment is always taken
3029 care of while the breakpoint is still
3031 stop_all_lwps (1, event_child
);
3033 delete_breakpoint (event_child
->exit_jump_pad_bkpt
);
3034 event_child
->exit_jump_pad_bkpt
= NULL
;
3036 unstop_all_lwps (1, event_child
);
3038 gdb_assert (event_child
->suspended
>= 0);
3042 if (event_child
->collecting_fast_tracepoint
== 0)
3045 debug_printf ("fast tracepoint finished "
3046 "collecting successfully.\n");
3048 /* We may have a deferred signal to report. */
3049 if (dequeue_one_deferred_signal (event_child
, &w
))
3052 debug_printf ("dequeued one signal.\n");
3057 debug_printf ("no deferred signals.\n");
3059 if (stabilizing_threads
)
3061 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3062 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3066 debug_printf ("linux_wait_1 ret = %s, stopped "
3067 "while stabilizing threads\n",
3068 target_pid_to_str (ptid_of (current_thread
)));
3072 return ptid_of (current_thread
);
3078 /* Check whether GDB would be interested in this event. */
3080 /* If GDB is not interested in this signal, don't stop other
3081 threads, and don't report it to GDB. Just resume the inferior
3082 right away. We do this for threading-related signals as well as
3083 any that GDB specifically requested we ignore. But never ignore
3084 SIGSTOP if we sent it ourselves, and do not ignore signals when
3085 stepping - they may require special handling to skip the signal
3086 handler. Also never ignore signals that could be caused by a
3088 /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
3091 && current_thread
->last_resume_kind
!= resume_step
3093 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3094 (current_process ()->priv
->thread_db
!= NULL
3095 && (WSTOPSIG (w
) == __SIGRTMIN
3096 || WSTOPSIG (w
) == __SIGRTMIN
+ 1))
3099 (pass_signals
[gdb_signal_from_host (WSTOPSIG (w
))]
3100 && !(WSTOPSIG (w
) == SIGSTOP
3101 && current_thread
->last_resume_kind
== resume_stop
)
3102 && !linux_wstatus_maybe_breakpoint (w
))))
3104 siginfo_t info
, *info_p
;
3107 debug_printf ("Ignored signal %d for LWP %ld.\n",
3108 WSTOPSIG (w
), lwpid_of (current_thread
));
3110 if (ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
),
3111 (PTRACE_TYPE_ARG3
) 0, &info
) == 0)
3115 linux_resume_one_lwp (event_child
, event_child
->stepping
,
3116 WSTOPSIG (w
), info_p
);
3117 return ignore_event (ourstatus
);
3120 /* Note that all addresses are always "out of the step range" when
3121 there's no range to begin with. */
3122 in_step_range
= lwp_in_step_range (event_child
);
3124 /* If GDB wanted this thread to single step, and the thread is out
3125 of the step range, we always want to report the SIGTRAP, and let
3126 GDB handle it. Watchpoints should always be reported. So should
3127 signals we can't explain. A SIGTRAP we can't explain could be a
3128 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3129 do, we're be able to handle GDB breakpoints on top of internal
3130 breakpoints, by handling the internal breakpoint and still
3131 reporting the event to GDB. If we don't, we're out of luck, GDB
3132 won't see the breakpoint hit. */
3133 report_to_gdb
= (!maybe_internal_trap
3134 || (current_thread
->last_resume_kind
== resume_step
3136 || event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3137 || (!step_over_finished
&& !in_step_range
3138 && !bp_explains_trap
&& !trace_event
)
3139 || (gdb_breakpoint_here (event_child
->stop_pc
)
3140 && gdb_condition_true_at_breakpoint (event_child
->stop_pc
)
3141 && gdb_no_commands_at_breakpoint (event_child
->stop_pc
))
3142 || extended_event_reported (&event_child
->waitstatus
));
3144 run_breakpoint_commands (event_child
->stop_pc
);
3146 /* We found no reason GDB would want us to stop. We either hit one
3147 of our own breakpoints, or finished an internal step GDB
3148 shouldn't know about. */
3153 if (bp_explains_trap
)
3154 debug_printf ("Hit a gdbserver breakpoint.\n");
3155 if (step_over_finished
)
3156 debug_printf ("Step-over finished.\n");
3158 debug_printf ("Tracepoint event.\n");
3159 if (lwp_in_step_range (event_child
))
3160 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3161 paddress (event_child
->stop_pc
),
3162 paddress (event_child
->step_range_start
),
3163 paddress (event_child
->step_range_end
));
3164 if (extended_event_reported (&event_child
->waitstatus
))
3166 char *str
= target_waitstatus_to_string (ourstatus
);
3167 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3168 lwpid_of (get_lwp_thread (event_child
)), str
);
3173 /* We're not reporting this breakpoint to GDB, so apply the
3174 decr_pc_after_break adjustment to the inferior's regcache
3177 if (the_low_target
.set_pc
!= NULL
)
3179 struct regcache
*regcache
3180 = get_thread_regcache (current_thread
, 1);
3181 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
);
3184 /* We may have finished stepping over a breakpoint. If so,
3185 we've stopped and suspended all LWPs momentarily except the
3186 stepping one. This is where we resume them all again. We're
3187 going to keep waiting, so use proceed, which handles stepping
3188 over the next breakpoint. */
3190 debug_printf ("proceeding all threads.\n");
3192 if (step_over_finished
)
3193 unsuspend_all_lwps (event_child
);
3195 proceed_all_lwps ();
3196 return ignore_event (ourstatus
);
3201 if (current_thread
->last_resume_kind
== resume_step
)
3203 if (event_child
->step_range_start
== event_child
->step_range_end
)
3204 debug_printf ("GDB wanted to single-step, reporting event.\n");
3205 else if (!lwp_in_step_range (event_child
))
3206 debug_printf ("Out of step range, reporting event.\n");
3208 if (event_child
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
)
3209 debug_printf ("Stopped by watchpoint.\n");
3210 else if (gdb_breakpoint_here (event_child
->stop_pc
))
3211 debug_printf ("Stopped by GDB breakpoint.\n");
3213 debug_printf ("Hit a non-gdbserver trap event.\n");
3216 /* Alright, we're going to report a stop. */
3218 if (!stabilizing_threads
)
3220 /* In all-stop, stop all threads. */
3222 stop_all_lwps (0, NULL
);
3224 /* If we're not waiting for a specific LWP, choose an event LWP
3225 from among those that have had events. Giving equal priority
3226 to all LWPs that have had events helps prevent
3228 if (ptid_equal (ptid
, minus_one_ptid
))
3230 event_child
->status_pending_p
= 1;
3231 event_child
->status_pending
= w
;
3233 select_event_lwp (&event_child
);
3235 /* current_thread and event_child must stay in sync. */
3236 current_thread
= get_lwp_thread (event_child
);
3238 event_child
->status_pending_p
= 0;
3239 w
= event_child
->status_pending
;
3242 if (step_over_finished
)
3246 /* If we were doing a step-over, all other threads but
3247 the stepping one had been paused in start_step_over,
3248 with their suspend counts incremented. We don't want
3249 to do a full unstop/unpause, because we're in
3250 all-stop mode (so we want threads stopped), but we
3251 still need to unsuspend the other threads, to
3252 decrement their `suspended' count back. */
3253 unsuspend_all_lwps (event_child
);
3257 /* If we just finished a step-over, then all threads had
3258 been momentarily paused. In all-stop, that's fine,
3259 we want threads stopped by now anyway. In non-stop,
3260 we need to re-resume threads that GDB wanted to be
3262 unstop_all_lwps (1, event_child
);
3266 /* Stabilize threads (move out of jump pads). */
3268 stabilize_threads ();
3272 /* If we just finished a step-over, then all threads had been
3273 momentarily paused. In all-stop, that's fine, we want
3274 threads stopped by now anyway. In non-stop, we need to
3275 re-resume threads that GDB wanted to be running. */
3276 if (step_over_finished
)
3277 unstop_all_lwps (1, event_child
);
3280 if (extended_event_reported (&event_child
->waitstatus
))
3282 /* If the reported event is a fork, vfork or exec, let GDB know. */
3283 ourstatus
->kind
= event_child
->waitstatus
.kind
;
3284 ourstatus
->value
= event_child
->waitstatus
.value
;
3286 /* Clear the event lwp's waitstatus since we handled it already. */
3287 event_child
->waitstatus
.kind
= TARGET_WAITKIND_IGNORE
;
3290 ourstatus
->kind
= TARGET_WAITKIND_STOPPED
;
3292 /* Now that we've selected our final event LWP, un-adjust its PC if
3293 it was a software breakpoint, and the client doesn't know we can
3294 adjust the breakpoint ourselves. */
3295 if (event_child
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
3296 && !swbreak_feature
)
3298 int decr_pc
= the_low_target
.decr_pc_after_break
;
3302 struct regcache
*regcache
3303 = get_thread_regcache (current_thread
, 1);
3304 (*the_low_target
.set_pc
) (regcache
, event_child
->stop_pc
+ decr_pc
);
3308 if (current_thread
->last_resume_kind
== resume_stop
3309 && WSTOPSIG (w
) == SIGSTOP
)
3311 /* A thread that has been requested to stop by GDB with vCont;t,
3312 and it stopped cleanly, so report as SIG0. The use of
3313 SIGSTOP is an implementation detail. */
3314 ourstatus
->value
.sig
= GDB_SIGNAL_0
;
3316 else if (current_thread
->last_resume_kind
== resume_stop
3317 && WSTOPSIG (w
) != SIGSTOP
)
3319 /* A thread that has been requested to stop by GDB with vCont;t,
3320 but, it stopped for other reasons. */
3321 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3323 else if (ourstatus
->kind
== TARGET_WAITKIND_STOPPED
)
3325 ourstatus
->value
.sig
= gdb_signal_from_host (WSTOPSIG (w
));
3328 gdb_assert (ptid_equal (step_over_bkpt
, null_ptid
));
3332 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3333 target_pid_to_str (ptid_of (current_thread
)),
3334 ourstatus
->kind
, ourstatus
->value
.sig
);
3338 return ptid_of (current_thread
);
3341 /* Get rid of any pending event in the pipe. */
3343 async_file_flush (void)
3349 ret
= read (linux_event_pipe
[0], &buf
, 1);
3350 while (ret
>= 0 || (ret
== -1 && errno
== EINTR
));
3353 /* Put something in the pipe, so the event loop wakes up. */
3355 async_file_mark (void)
3359 async_file_flush ();
3362 ret
= write (linux_event_pipe
[1], "+", 1);
3363 while (ret
== 0 || (ret
== -1 && errno
== EINTR
));
3365 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3366 be awakened anyway. */
3370 linux_wait (ptid_t ptid
,
3371 struct target_waitstatus
*ourstatus
, int target_options
)
3375 /* Flush the async file first. */
3376 if (target_is_async_p ())
3377 async_file_flush ();
3381 event_ptid
= linux_wait_1 (ptid
, ourstatus
, target_options
);
3383 while ((target_options
& TARGET_WNOHANG
) == 0
3384 && ptid_equal (event_ptid
, null_ptid
)
3385 && ourstatus
->kind
== TARGET_WAITKIND_IGNORE
);
3387 /* If at least one stop was reported, there may be more. A single
3388 SIGCHLD can signal more than one child stop. */
3389 if (target_is_async_p ()
3390 && (target_options
& TARGET_WNOHANG
) != 0
3391 && !ptid_equal (event_ptid
, null_ptid
))
3397 /* Send a signal to an LWP. */
3400 kill_lwp (unsigned long lwpid
, int signo
)
3402 /* Use tkill, if possible, in case we are using nptl threads. If tkill
3403 fails, then we are not using nptl threads and we should be using kill. */
3407 static int tkill_failed
;
3414 ret
= syscall (__NR_tkill
, lwpid
, signo
);
3415 if (errno
!= ENOSYS
)
3422 return kill (lwpid
, signo
);
3426 linux_stop_lwp (struct lwp_info
*lwp
)
3432 send_sigstop (struct lwp_info
*lwp
)
3436 pid
= lwpid_of (get_lwp_thread (lwp
));
3438 /* If we already have a pending stop signal for this process, don't
3440 if (lwp
->stop_expected
)
3443 debug_printf ("Have pending sigstop for lwp %d\n", pid
);
3449 debug_printf ("Sending sigstop to lwp %d\n", pid
);
3451 lwp
->stop_expected
= 1;
3452 kill_lwp (pid
, SIGSTOP
);
3456 send_sigstop_callback (struct inferior_list_entry
*entry
, void *except
)
3458 struct thread_info
*thread
= (struct thread_info
*) entry
;
3459 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3461 /* Ignore EXCEPT. */
3472 /* Increment the suspend count of an LWP, and stop it, if not stopped
3475 suspend_and_send_sigstop_callback (struct inferior_list_entry
*entry
,
3478 struct thread_info
*thread
= (struct thread_info
*) entry
;
3479 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3481 /* Ignore EXCEPT. */
3487 return send_sigstop_callback (entry
, except
);
3491 mark_lwp_dead (struct lwp_info
*lwp
, int wstat
)
3493 /* It's dead, really. */
3496 /* Store the exit status for later. */
3497 lwp
->status_pending_p
= 1;
3498 lwp
->status_pending
= wstat
;
3500 /* Prevent trying to stop it. */
3503 /* No further stops are expected from a dead lwp. */
3504 lwp
->stop_expected
= 0;
3507 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3510 wait_for_sigstop (void)
3512 struct thread_info
*saved_thread
;
3517 saved_thread
= current_thread
;
3518 if (saved_thread
!= NULL
)
3519 saved_tid
= saved_thread
->entry
.id
;
3521 saved_tid
= null_ptid
; /* avoid bogus unused warning */
3524 debug_printf ("wait_for_sigstop: pulling events\n");
3526 /* Passing NULL_PTID as filter indicates we want all events to be
3527 left pending. Eventually this returns when there are no
3528 unwaited-for children left. */
3529 ret
= linux_wait_for_event_filtered (minus_one_ptid
, null_ptid
,
3531 gdb_assert (ret
== -1);
3533 if (saved_thread
== NULL
|| linux_thread_alive (saved_tid
))
3534 current_thread
= saved_thread
;
3538 debug_printf ("Previously current thread died.\n");
3542 /* We can't change the current inferior behind GDB's back,
3543 otherwise, a subsequent command may apply to the wrong
3545 current_thread
= NULL
;
3549 /* Set a valid thread as current. */
3550 set_desired_thread (0);
3555 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3556 move it out, because we need to report the stop event to GDB. For
3557 example, if the user puts a breakpoint in the jump pad, it's
3558 because she wants to debug it. */
3561 stuck_in_jump_pad_callback (struct inferior_list_entry
*entry
, void *data
)
3563 struct thread_info
*thread
= (struct thread_info
*) entry
;
3564 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3566 gdb_assert (lwp
->suspended
== 0);
3567 gdb_assert (lwp
->stopped
);
3569 /* Allow debugging the jump pad, gdb_collect, etc.. */
3570 return (supports_fast_tracepoints ()
3571 && agent_loaded_p ()
3572 && (gdb_breakpoint_here (lwp
->stop_pc
)
3573 || lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
3574 || thread
->last_resume_kind
== resume_step
)
3575 && linux_fast_tracepoint_collecting (lwp
, NULL
));
3579 move_out_of_jump_pad_callback (struct inferior_list_entry
*entry
)
3581 struct thread_info
*thread
= (struct thread_info
*) entry
;
3582 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3585 gdb_assert (lwp
->suspended
== 0);
3586 gdb_assert (lwp
->stopped
);
3588 wstat
= lwp
->status_pending_p
? &lwp
->status_pending
: NULL
;
3590 /* Allow debugging the jump pad, gdb_collect, etc. */
3591 if (!gdb_breakpoint_here (lwp
->stop_pc
)
3592 && lwp
->stop_reason
!= TARGET_STOPPED_BY_WATCHPOINT
3593 && thread
->last_resume_kind
!= resume_step
3594 && maybe_move_out_of_jump_pad (lwp
, wstat
))
3597 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
3602 lwp
->status_pending_p
= 0;
3603 enqueue_one_deferred_signal (lwp
, wstat
);
3606 debug_printf ("Signal %d for LWP %ld deferred "
3608 WSTOPSIG (*wstat
), lwpid_of (thread
));
3611 linux_resume_one_lwp (lwp
, 0, 0, NULL
);
3618 lwp_running (struct inferior_list_entry
*entry
, void *data
)
3620 struct thread_info
*thread
= (struct thread_info
*) entry
;
3621 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3630 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
3631 If SUSPEND, then also increase the suspend count of every LWP,
3635 stop_all_lwps (int suspend
, struct lwp_info
*except
)
3637 /* Should not be called recursively. */
3638 gdb_assert (stopping_threads
== NOT_STOPPING_THREADS
);
3643 debug_printf ("stop_all_lwps (%s, except=%s)\n",
3644 suspend
? "stop-and-suspend" : "stop",
3646 ? target_pid_to_str (ptid_of (get_lwp_thread (except
)))
3650 stopping_threads
= (suspend
3651 ? STOPPING_AND_SUSPENDING_THREADS
3652 : STOPPING_THREADS
);
3655 find_inferior (&all_threads
, suspend_and_send_sigstop_callback
, except
);
3657 find_inferior (&all_threads
, send_sigstop_callback
, except
);
3658 wait_for_sigstop ();
3659 stopping_threads
= NOT_STOPPING_THREADS
;
3663 debug_printf ("stop_all_lwps done, setting stopping_threads "
3664 "back to !stopping\n");
3669 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
3670 SIGNAL is nonzero, give it that signal. */
3673 linux_resume_one_lwp_throw (struct lwp_info
*lwp
,
3674 int step
, int signal
, siginfo_t
*info
)
3676 struct thread_info
*thread
= get_lwp_thread (lwp
);
3677 struct thread_info
*saved_thread
;
3678 int fast_tp_collecting
;
3680 if (lwp
->stopped
== 0)
3683 fast_tp_collecting
= lwp
->collecting_fast_tracepoint
;
3685 gdb_assert (!stabilizing_threads
|| fast_tp_collecting
);
3687 /* Cancel actions that rely on GDB not changing the PC (e.g., the
3688 user used the "jump" command, or "set $pc = foo"). */
3689 if (lwp
->stop_pc
!= get_pc (lwp
))
3691 /* Collecting 'while-stepping' actions doesn't make sense
3693 release_while_stepping_state_list (thread
);
3696 /* If we have pending signals or status, and a new signal, enqueue the
3697 signal. Also enqueue the signal if we are waiting to reinsert a
3698 breakpoint; it will be picked up again below. */
3700 && (lwp
->status_pending_p
3701 || lwp
->pending_signals
!= NULL
3702 || lwp
->bp_reinsert
!= 0
3703 || fast_tp_collecting
))
3705 struct pending_signals
*p_sig
;
3706 p_sig
= xmalloc (sizeof (*p_sig
));
3707 p_sig
->prev
= lwp
->pending_signals
;
3708 p_sig
->signal
= signal
;
3710 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
3712 memcpy (&p_sig
->info
, info
, sizeof (siginfo_t
));
3713 lwp
->pending_signals
= p_sig
;
3716 if (lwp
->status_pending_p
)
3719 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
3720 " has pending status\n",
3721 lwpid_of (thread
), step
? "step" : "continue", signal
,
3722 lwp
->stop_expected
? "expected" : "not expected");
3726 saved_thread
= current_thread
;
3727 current_thread
= thread
;
3730 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
3731 lwpid_of (thread
), step
? "step" : "continue", signal
,
3732 lwp
->stop_expected
? "expected" : "not expected");
3734 /* This bit needs some thinking about. If we get a signal that
3735 we must report while a single-step reinsert is still pending,
3736 we often end up resuming the thread. It might be better to
3737 (ew) allow a stack of pending events; then we could be sure that
3738 the reinsert happened right away and not lose any signals.
3740 Making this stack would also shrink the window in which breakpoints are
3741 uninserted (see comment in linux_wait_for_lwp) but not enough for
3742 complete correctness, so it won't solve that problem. It may be
3743 worthwhile just to solve this one, however. */
3744 if (lwp
->bp_reinsert
!= 0)
3747 debug_printf (" pending reinsert at 0x%s\n",
3748 paddress (lwp
->bp_reinsert
));
3750 if (can_hardware_single_step ())
3752 if (fast_tp_collecting
== 0)
3755 fprintf (stderr
, "BAD - reinserting but not stepping.\n");
3757 fprintf (stderr
, "BAD - reinserting and suspended(%d).\n",
3764 /* Postpone any pending signal. It was enqueued above. */
3768 if (fast_tp_collecting
== 1)
3771 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3772 " (exit-jump-pad-bkpt)\n",
3775 /* Postpone any pending signal. It was enqueued above. */
3778 else if (fast_tp_collecting
== 2)
3781 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
3782 " single-stepping\n",
3785 if (can_hardware_single_step ())
3789 internal_error (__FILE__
, __LINE__
,
3790 "moving out of jump pad single-stepping"
3791 " not implemented on this target");
3794 /* Postpone any pending signal. It was enqueued above. */
3798 /* If we have while-stepping actions in this thread set it stepping.
3799 If we have a signal to deliver, it may or may not be set to
3800 SIG_IGN, we don't know. Assume so, and allow collecting
3801 while-stepping into a signal handler. A possible smart thing to
3802 do would be to set an internal breakpoint at the signal return
3803 address, continue, and carry on catching this while-stepping
3804 action only when that breakpoint is hit. A future
3806 if (thread
->while_stepping
!= NULL
3807 && can_hardware_single_step ())
3810 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
3815 if (the_low_target
.get_pc
!= NULL
)
3817 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
3819 lwp
->stop_pc
= (*the_low_target
.get_pc
) (regcache
);
3823 debug_printf (" %s from pc 0x%lx\n", step
? "step" : "continue",
3824 (long) lwp
->stop_pc
);
3828 /* If we have pending signals, consume one unless we are trying to
3829 reinsert a breakpoint or we're trying to finish a fast tracepoint
3831 if (lwp
->pending_signals
!= NULL
3832 && lwp
->bp_reinsert
== 0
3833 && fast_tp_collecting
== 0)
3835 struct pending_signals
**p_sig
;
3837 p_sig
= &lwp
->pending_signals
;
3838 while ((*p_sig
)->prev
!= NULL
)
3839 p_sig
= &(*p_sig
)->prev
;
3841 signal
= (*p_sig
)->signal
;
3842 if ((*p_sig
)->info
.si_signo
!= 0)
3843 ptrace (PTRACE_SETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
3850 if (the_low_target
.prepare_to_resume
!= NULL
)
3851 the_low_target
.prepare_to_resume (lwp
);
3853 regcache_invalidate_thread (thread
);
3855 lwp
->stepping
= step
;
3856 ptrace (step
? PTRACE_SINGLESTEP
: PTRACE_CONT
, lwpid_of (thread
),
3857 (PTRACE_TYPE_ARG3
) 0,
3858 /* Coerce to a uintptr_t first to avoid potential gcc warning
3859 of coercing an 8 byte integer to a 4 byte pointer. */
3860 (PTRACE_TYPE_ARG4
) (uintptr_t) signal
);
3862 current_thread
= saved_thread
;
3864 perror_with_name ("resuming thread");
3866 /* Successfully resumed. Clear state that no longer makes sense,
3867 and mark the LWP as running. Must not do this before resuming
3868 otherwise if that fails other code will be confused. E.g., we'd
3869 later try to stop the LWP and hang forever waiting for a stop
3870 status. Note that we must not throw after this is cleared,
3871 otherwise handle_zombie_lwp_error would get confused. */
3873 lwp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3876 /* Called when we try to resume a stopped LWP and that errors out. If
3877 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
3878 or about to become), discard the error, clear any pending status
3879 the LWP may have, and return true (we'll collect the exit status
3880 soon enough). Otherwise, return false. */
3883 check_ptrace_stopped_lwp_gone (struct lwp_info
*lp
)
3885 struct thread_info
*thread
= get_lwp_thread (lp
);
3887 /* If we get an error after resuming the LWP successfully, we'd
3888 confuse !T state for the LWP being gone. */
3889 gdb_assert (lp
->stopped
);
3891 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
3892 because even if ptrace failed with ESRCH, the tracee may be "not
3893 yet fully dead", but already refusing ptrace requests. In that
3894 case the tracee has 'R (Running)' state for a little bit
3895 (observed in Linux 3.18). See also the note on ESRCH in the
3896 ptrace(2) man page. Instead, check whether the LWP has any state
3897 other than ptrace-stopped. */
3899 /* Don't assume anything if /proc/PID/status can't be read. */
3900 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread
)) == 0)
3902 lp
->stop_reason
= TARGET_STOPPED_BY_NO_REASON
;
3903 lp
->status_pending_p
= 0;
3909 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
3910 disappears while we try to resume it. */
3913 linux_resume_one_lwp (struct lwp_info
*lwp
,
3914 int step
, int signal
, siginfo_t
*info
)
3918 linux_resume_one_lwp_throw (lwp
, step
, signal
, info
);
3920 CATCH (ex
, RETURN_MASK_ERROR
)
3922 if (!check_ptrace_stopped_lwp_gone (lwp
))
3923 throw_exception (ex
);
3928 struct thread_resume_array
3930 struct thread_resume
*resume
;
3934 /* This function is called once per thread via find_inferior.
3935 ARG is a pointer to a thread_resume_array struct.
3936 We look up the thread specified by ENTRY in ARG, and mark the thread
3937 with a pointer to the appropriate resume request.
3939 This algorithm is O(threads * resume elements), but resume elements
3940 is small (and will remain small at least until GDB supports thread
3944 linux_set_resume_request (struct inferior_list_entry
*entry
, void *arg
)
3946 struct thread_info
*thread
= (struct thread_info
*) entry
;
3947 struct lwp_info
*lwp
= get_thread_lwp (thread
);
3949 struct thread_resume_array
*r
;
3953 for (ndx
= 0; ndx
< r
->n
; ndx
++)
3955 ptid_t ptid
= r
->resume
[ndx
].thread
;
3956 if (ptid_equal (ptid
, minus_one_ptid
)
3957 || ptid_equal (ptid
, entry
->id
)
3958 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
3960 || (ptid_get_pid (ptid
) == pid_of (thread
)
3961 && (ptid_is_pid (ptid
)
3962 || ptid_get_lwp (ptid
) == -1)))
3964 if (r
->resume
[ndx
].kind
== resume_stop
3965 && thread
->last_resume_kind
== resume_stop
)
3968 debug_printf ("already %s LWP %ld at GDB's request\n",
3969 (thread
->last_status
.kind
3970 == TARGET_WAITKIND_STOPPED
)
3978 lwp
->resume
= &r
->resume
[ndx
];
3979 thread
->last_resume_kind
= lwp
->resume
->kind
;
3981 lwp
->step_range_start
= lwp
->resume
->step_range_start
;
3982 lwp
->step_range_end
= lwp
->resume
->step_range_end
;
3984 /* If we had a deferred signal to report, dequeue one now.
3985 This can happen if LWP gets more than one signal while
3986 trying to get out of a jump pad. */
3988 && !lwp
->status_pending_p
3989 && dequeue_one_deferred_signal (lwp
, &lwp
->status_pending
))
3991 lwp
->status_pending_p
= 1;
3994 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
3995 "leaving status pending.\n",
3996 WSTOPSIG (lwp
->status_pending
),
4004 /* No resume action for this thread. */
4010 /* find_inferior callback for linux_resume.
4011 Set *FLAG_P if this lwp has an interesting status pending. */
4014 resume_status_pending_p (struct inferior_list_entry
*entry
, void *flag_p
)
4016 struct thread_info
*thread
= (struct thread_info
*) entry
;
4017 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4019 /* LWPs which will not be resumed are not interesting, because
4020 we might not wait for them next time through linux_wait. */
4021 if (lwp
->resume
== NULL
)
4024 if (thread_still_has_status_pending_p (thread
))
4025 * (int *) flag_p
= 1;
4030 /* Return 1 if this lwp that GDB wants running is stopped at an
4031 internal breakpoint that we need to step over. It assumes that any
4032 required STOP_PC adjustment has already been propagated to the
4033 inferior's regcache. */
4036 need_step_over_p (struct inferior_list_entry
*entry
, void *dummy
)
4038 struct thread_info
*thread
= (struct thread_info
*) entry
;
4039 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4040 struct thread_info
*saved_thread
;
4043 /* LWPs which will not be resumed are not interesting, because we
4044 might not wait for them next time through linux_wait. */
4049 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4054 if (thread
->last_resume_kind
== resume_stop
)
4057 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4063 gdb_assert (lwp
->suspended
>= 0);
4068 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4073 if (!lwp
->need_step_over
)
4076 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread
));
4079 if (lwp
->status_pending_p
)
4082 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4088 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4092 /* If the PC has changed since we stopped, then don't do anything,
4093 and let the breakpoint/tracepoint be hit. This happens if, for
4094 instance, GDB handled the decr_pc_after_break subtraction itself,
4095 GDB is OOL stepping this thread, or the user has issued a "jump"
4096 command, or poked thread's registers herself. */
4097 if (pc
!= lwp
->stop_pc
)
4100 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4101 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4103 paddress (lwp
->stop_pc
), paddress (pc
));
4105 lwp
->need_step_over
= 0;
4109 saved_thread
= current_thread
;
4110 current_thread
= thread
;
4112 /* We can only step over breakpoints we know about. */
4113 if (breakpoint_here (pc
) || fast_tracepoint_jump_here (pc
))
4115 /* Don't step over a breakpoint that GDB expects to hit
4116 though. If the condition is being evaluated on the target's side
4117 and it evaluate to false, step over this breakpoint as well. */
4118 if (gdb_breakpoint_here (pc
)
4119 && gdb_condition_true_at_breakpoint (pc
)
4120 && gdb_no_commands_at_breakpoint (pc
))
4123 debug_printf ("Need step over [LWP %ld]? yes, but found"
4124 " GDB breakpoint at 0x%s; skipping step over\n",
4125 lwpid_of (thread
), paddress (pc
));
4127 current_thread
= saved_thread
;
4133 debug_printf ("Need step over [LWP %ld]? yes, "
4134 "found breakpoint at 0x%s\n",
4135 lwpid_of (thread
), paddress (pc
));
4137 /* We've found an lwp that needs stepping over --- return 1 so
4138 that find_inferior stops looking. */
4139 current_thread
= saved_thread
;
4141 /* If the step over is cancelled, this is set again. */
4142 lwp
->need_step_over
= 0;
4147 current_thread
= saved_thread
;
4150 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4152 lwpid_of (thread
), paddress (pc
));
4157 /* Start a step-over operation on LWP. When LWP stopped at a
4158 breakpoint, to make progress, we need to remove the breakpoint out
4159 of the way. If we let other threads run while we do that, they may
4160 pass by the breakpoint location and miss hitting it. To avoid
4161 that, a step-over momentarily stops all threads while LWP is
4162 single-stepped while the breakpoint is temporarily uninserted from
4163 the inferior. When the single-step finishes, we reinsert the
4164 breakpoint, and let all threads that are supposed to be running,
4167 On targets that don't support hardware single-step, we don't
4168 currently support full software single-stepping. Instead, we only
4169 support stepping over the thread event breakpoint, by asking the
4170 low target where to place a reinsert breakpoint. Since this
4171 routine assumes the breakpoint being stepped over is a thread event
4172 breakpoint, it usually assumes the return address of the current
4173 function is a good enough place to set the reinsert breakpoint. */
4176 start_step_over (struct lwp_info
*lwp
)
4178 struct thread_info
*thread
= get_lwp_thread (lwp
);
4179 struct thread_info
*saved_thread
;
4184 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4187 stop_all_lwps (1, lwp
);
4188 gdb_assert (lwp
->suspended
== 0);
4191 debug_printf ("Done stopping all threads for step-over.\n");
4193 /* Note, we should always reach here with an already adjusted PC,
4194 either by GDB (if we're resuming due to GDB's request), or by our
4195 caller, if we just finished handling an internal breakpoint GDB
4196 shouldn't care about. */
4199 saved_thread
= current_thread
;
4200 current_thread
= thread
;
4202 lwp
->bp_reinsert
= pc
;
4203 uninsert_breakpoints_at (pc
);
4204 uninsert_fast_tracepoint_jumps_at (pc
);
4206 if (can_hardware_single_step ())
4212 CORE_ADDR raddr
= (*the_low_target
.breakpoint_reinsert_addr
) ();
4213 set_reinsert_breakpoint (raddr
);
4217 current_thread
= saved_thread
;
4219 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4221 /* Require next event from this LWP. */
4222 step_over_bkpt
= thread
->entry
.id
;
4226 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4227 start_step_over, if still there, and delete any reinsert
4228 breakpoints we've set, on non hardware single-step targets. */
4231 finish_step_over (struct lwp_info
*lwp
)
4233 if (lwp
->bp_reinsert
!= 0)
4236 debug_printf ("Finished step over.\n");
4238 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4239 may be no breakpoint to reinsert there by now. */
4240 reinsert_breakpoints_at (lwp
->bp_reinsert
);
4241 reinsert_fast_tracepoint_jumps_at (lwp
->bp_reinsert
);
4243 lwp
->bp_reinsert
= 0;
4245 /* Delete any software-single-step reinsert breakpoints. No
4246 longer needed. We don't have to worry about other threads
4247 hitting this trap, and later not being able to explain it,
4248 because we were stepping over a breakpoint, and we hold all
4249 threads but LWP stopped while doing that. */
4250 if (!can_hardware_single_step ())
4251 delete_reinsert_breakpoints ();
4253 step_over_bkpt
= null_ptid
;
4260 /* This function is called once per thread. We check the thread's resume
4261 request, which will tell us whether to resume, step, or leave the thread
4262 stopped; and what signal, if any, it should be sent.
4264 For threads which we aren't explicitly told otherwise, we preserve
4265 the stepping flag; this is used for stepping over gdbserver-placed
4268 If pending_flags was set in any thread, we queue any needed
4269 signals, since we won't actually resume. We already have a pending
4270 event to report, so we don't need to preserve any step requests;
4271 they should be re-issued if necessary. */
4274 linux_resume_one_thread (struct inferior_list_entry
*entry
, void *arg
)
4276 struct thread_info
*thread
= (struct thread_info
*) entry
;
4277 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4279 int leave_all_stopped
= * (int *) arg
;
4282 if (lwp
->resume
== NULL
)
4285 if (lwp
->resume
->kind
== resume_stop
)
4288 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread
));
4293 debug_printf ("stopping LWP %ld\n", lwpid_of (thread
));
4295 /* Stop the thread, and wait for the event asynchronously,
4296 through the event loop. */
4302 debug_printf ("already stopped LWP %ld\n",
4305 /* The LWP may have been stopped in an internal event that
4306 was not meant to be notified back to GDB (e.g., gdbserver
4307 breakpoint), so we should be reporting a stop event in
4310 /* If the thread already has a pending SIGSTOP, this is a
4311 no-op. Otherwise, something later will presumably resume
4312 the thread and this will cause it to cancel any pending
4313 operation, due to last_resume_kind == resume_stop. If
4314 the thread already has a pending status to report, we
4315 will still report it the next time we wait - see
4316 status_pending_p_callback. */
4318 /* If we already have a pending signal to report, then
4319 there's no need to queue a SIGSTOP, as this means we're
4320 midway through moving the LWP out of the jumppad, and we
4321 will report the pending signal as soon as that is
4323 if (lwp
->pending_signals_to_report
== NULL
)
4327 /* For stop requests, we're done. */
4329 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4333 /* If this thread which is about to be resumed has a pending status,
4334 then don't resume any threads - we can just report the pending
4335 status. Make sure to queue any signals that would otherwise be
4336 sent. In all-stop mode, we do this decision based on if *any*
4337 thread has a pending status. If there's a thread that needs the
4338 step-over-breakpoint dance, then don't resume any other thread
4339 but that particular one. */
4340 leave_pending
= (lwp
->status_pending_p
|| leave_all_stopped
);
4345 debug_printf ("resuming LWP %ld\n", lwpid_of (thread
));
4347 step
= (lwp
->resume
->kind
== resume_step
);
4348 linux_resume_one_lwp (lwp
, step
, lwp
->resume
->sig
, NULL
);
4353 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread
));
4355 /* If we have a new signal, enqueue the signal. */
4356 if (lwp
->resume
->sig
!= 0)
4358 struct pending_signals
*p_sig
;
4359 p_sig
= xmalloc (sizeof (*p_sig
));
4360 p_sig
->prev
= lwp
->pending_signals
;
4361 p_sig
->signal
= lwp
->resume
->sig
;
4362 memset (&p_sig
->info
, 0, sizeof (siginfo_t
));
4364 /* If this is the same signal we were previously stopped by,
4365 make sure to queue its siginfo. We can ignore the return
4366 value of ptrace; if it fails, we'll skip
4367 PTRACE_SETSIGINFO. */
4368 if (WIFSTOPPED (lwp
->last_status
)
4369 && WSTOPSIG (lwp
->last_status
) == lwp
->resume
->sig
)
4370 ptrace (PTRACE_GETSIGINFO
, lwpid_of (thread
), (PTRACE_TYPE_ARG3
) 0,
4373 lwp
->pending_signals
= p_sig
;
4377 thread
->last_status
.kind
= TARGET_WAITKIND_IGNORE
;
4383 linux_resume (struct thread_resume
*resume_info
, size_t n
)
4385 struct thread_resume_array array
= { resume_info
, n
};
4386 struct thread_info
*need_step_over
= NULL
;
4388 int leave_all_stopped
;
4393 debug_printf ("linux_resume:\n");
4396 find_inferior (&all_threads
, linux_set_resume_request
, &array
);
4398 /* If there is a thread which would otherwise be resumed, which has
4399 a pending status, then don't resume any threads - we can just
4400 report the pending status. Make sure to queue any signals that
4401 would otherwise be sent. In non-stop mode, we'll apply this
4402 logic to each thread individually. We consume all pending events
4403 before considering to start a step-over (in all-stop). */
4406 find_inferior (&all_threads
, resume_status_pending_p
, &any_pending
);
4408 /* If there is a thread which would otherwise be resumed, which is
4409 stopped at a breakpoint that needs stepping over, then don't
4410 resume any threads - have it step over the breakpoint with all
4411 other threads stopped, then resume all threads again. Make sure
4412 to queue any signals that would otherwise be delivered or
4414 if (!any_pending
&& supports_breakpoints ())
4416 = (struct thread_info
*) find_inferior (&all_threads
,
4417 need_step_over_p
, NULL
);
4419 leave_all_stopped
= (need_step_over
!= NULL
|| any_pending
);
4423 if (need_step_over
!= NULL
)
4424 debug_printf ("Not resuming all, need step over\n");
4425 else if (any_pending
)
4426 debug_printf ("Not resuming, all-stop and found "
4427 "an LWP with pending status\n");
4429 debug_printf ("Resuming, no pending status or step over needed\n");
4432 /* Even if we're leaving threads stopped, queue all signals we'd
4433 otherwise deliver. */
4434 find_inferior (&all_threads
, linux_resume_one_thread
, &leave_all_stopped
);
4437 start_step_over (get_thread_lwp (need_step_over
));
4441 debug_printf ("linux_resume done\n");
4446 /* This function is called once per thread. We check the thread's
4447 last resume request, which will tell us whether to resume, step, or
4448 leave the thread stopped. Any signal the client requested to be
4449 delivered has already been enqueued at this point.
4451 If any thread that GDB wants running is stopped at an internal
4452 breakpoint that needs stepping over, we start a step-over operation
4453 on that particular thread, and leave all others stopped. */
4456 proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4458 struct thread_info
*thread
= (struct thread_info
*) entry
;
4459 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4466 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread
));
4471 debug_printf (" LWP %ld already running\n", lwpid_of (thread
));
4475 if (thread
->last_resume_kind
== resume_stop
4476 && thread
->last_status
.kind
!= TARGET_WAITKIND_IGNORE
)
4479 debug_printf (" client wants LWP to remain %ld stopped\n",
4484 if (lwp
->status_pending_p
)
4487 debug_printf (" LWP %ld has pending status, leaving stopped\n",
4492 gdb_assert (lwp
->suspended
>= 0);
4497 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread
));
4501 if (thread
->last_resume_kind
== resume_stop
4502 && lwp
->pending_signals_to_report
== NULL
4503 && lwp
->collecting_fast_tracepoint
== 0)
4505 /* We haven't reported this LWP as stopped yet (otherwise, the
4506 last_status.kind check above would catch it, and we wouldn't
4507 reach here. This LWP may have been momentarily paused by a
4508 stop_all_lwps call while handling for example, another LWP's
4509 step-over. In that case, the pending expected SIGSTOP signal
4510 that was queued at vCont;t handling time will have already
4511 been consumed by wait_for_sigstop, and so we need to requeue
4512 another one here. Note that if the LWP already has a SIGSTOP
4513 pending, this is a no-op. */
4516 debug_printf ("Client wants LWP %ld to stop. "
4517 "Making sure it has a SIGSTOP pending\n",
4523 step
= thread
->last_resume_kind
== resume_step
;
4524 linux_resume_one_lwp (lwp
, step
, 0, NULL
);
4529 unsuspend_and_proceed_one_lwp (struct inferior_list_entry
*entry
, void *except
)
4531 struct thread_info
*thread
= (struct thread_info
*) entry
;
4532 struct lwp_info
*lwp
= get_thread_lwp (thread
);
4538 gdb_assert (lwp
->suspended
>= 0);
4540 return proceed_one_lwp (entry
, except
);
4543 /* When we finish a step-over, set threads running again. If there's
4544 another thread that may need a step-over, now's the time to start
4545 it. Eventually, we'll move all threads past their breakpoints. */
4548 proceed_all_lwps (void)
4550 struct thread_info
*need_step_over
;
4552 /* If there is a thread which would otherwise be resumed, which is
4553 stopped at a breakpoint that needs stepping over, then don't
4554 resume any threads - have it step over the breakpoint with all
4555 other threads stopped, then resume all threads again. */
4557 if (supports_breakpoints ())
4560 = (struct thread_info
*) find_inferior (&all_threads
,
4561 need_step_over_p
, NULL
);
4563 if (need_step_over
!= NULL
)
4566 debug_printf ("proceed_all_lwps: found "
4567 "thread %ld needing a step-over\n",
4568 lwpid_of (need_step_over
));
4570 start_step_over (get_thread_lwp (need_step_over
));
4576 debug_printf ("Proceeding, no step-over needed\n");
4578 find_inferior (&all_threads
, proceed_one_lwp
, NULL
);
4581 /* Stopped LWPs that the client wanted to be running, that don't have
4582 pending statuses, are set to run again, except for EXCEPT, if not
4583 NULL. This undoes a stop_all_lwps call. */
4586 unstop_all_lwps (int unsuspend
, struct lwp_info
*except
)
4592 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
4593 lwpid_of (get_lwp_thread (except
)));
4595 debug_printf ("unstopping all lwps\n");
4599 find_inferior (&all_threads
, unsuspend_and_proceed_one_lwp
, except
);
4601 find_inferior (&all_threads
, proceed_one_lwp
, except
);
4605 debug_printf ("unstop_all_lwps done\n");
4611 #ifdef HAVE_LINUX_REGSETS
4613 #define use_linux_regsets 1
4615 /* Returns true if REGSET has been disabled. */
4618 regset_disabled (struct regsets_info
*info
, struct regset_info
*regset
)
4620 return (info
->disabled_regsets
!= NULL
4621 && info
->disabled_regsets
[regset
- info
->regsets
]);
4624 /* Disable REGSET. */
4627 disable_regset (struct regsets_info
*info
, struct regset_info
*regset
)
4631 dr_offset
= regset
- info
->regsets
;
4632 if (info
->disabled_regsets
== NULL
)
4633 info
->disabled_regsets
= xcalloc (1, info
->num_regsets
);
4634 info
->disabled_regsets
[dr_offset
] = 1;
4638 regsets_fetch_inferior_registers (struct regsets_info
*regsets_info
,
4639 struct regcache
*regcache
)
4641 struct regset_info
*regset
;
4642 int saw_general_regs
= 0;
4646 pid
= lwpid_of (current_thread
);
4647 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4652 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
))
4655 buf
= xmalloc (regset
->size
);
4657 nt_type
= regset
->nt_type
;
4661 iov
.iov_len
= regset
->size
;
4662 data
= (void *) &iov
;
4668 res
= ptrace (regset
->get_request
, pid
,
4669 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4671 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4677 /* If we get EIO on a regset, do not try it again for
4678 this process mode. */
4679 disable_regset (regsets_info
, regset
);
4681 else if (errno
== ENODATA
)
4683 /* ENODATA may be returned if the regset is currently
4684 not "active". This can happen in normal operation,
4685 so suppress the warning in this case. */
4690 sprintf (s
, "ptrace(regsets_fetch_inferior_registers) PID=%d",
4697 if (regset
->type
== GENERAL_REGS
)
4698 saw_general_regs
= 1;
4699 regset
->store_function (regcache
, buf
);
4703 if (saw_general_regs
)
4710 regsets_store_inferior_registers (struct regsets_info
*regsets_info
,
4711 struct regcache
*regcache
)
4713 struct regset_info
*regset
;
4714 int saw_general_regs
= 0;
4718 pid
= lwpid_of (current_thread
);
4719 for (regset
= regsets_info
->regsets
; regset
->size
>= 0; regset
++)
4724 if (regset
->size
== 0 || regset_disabled (regsets_info
, regset
)
4725 || regset
->fill_function
== NULL
)
4728 buf
= xmalloc (regset
->size
);
4730 /* First fill the buffer with the current register set contents,
4731 in case there are any items in the kernel's regset that are
4732 not in gdbserver's regcache. */
4734 nt_type
= regset
->nt_type
;
4738 iov
.iov_len
= regset
->size
;
4739 data
= (void *) &iov
;
4745 res
= ptrace (regset
->get_request
, pid
,
4746 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4748 res
= ptrace (regset
->get_request
, pid
, data
, nt_type
);
4753 /* Then overlay our cached registers on that. */
4754 regset
->fill_function (regcache
, buf
);
4756 /* Only now do we write the register set. */
4758 res
= ptrace (regset
->set_request
, pid
,
4759 (PTRACE_TYPE_ARG3
) (long) nt_type
, data
);
4761 res
= ptrace (regset
->set_request
, pid
, data
, nt_type
);
4769 /* If we get EIO on a regset, do not try it again for
4770 this process mode. */
4771 disable_regset (regsets_info
, regset
);
4773 else if (errno
== ESRCH
)
4775 /* At this point, ESRCH should mean the process is
4776 already gone, in which case we simply ignore attempts
4777 to change its registers. See also the related
4778 comment in linux_resume_one_lwp. */
4784 perror ("Warning: ptrace(regsets_store_inferior_registers)");
4787 else if (regset
->type
== GENERAL_REGS
)
4788 saw_general_regs
= 1;
4791 if (saw_general_regs
)
4797 #else /* !HAVE_LINUX_REGSETS */
4799 #define use_linux_regsets 0
4800 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
4801 #define regsets_store_inferior_registers(regsets_info, regcache) 1
4805 /* Return 1 if register REGNO is supported by one of the regset ptrace
4806 calls or 0 if it has to be transferred individually. */
4809 linux_register_in_regsets (const struct regs_info
*regs_info
, int regno
)
4811 unsigned char mask
= 1 << (regno
% 8);
4812 size_t index
= regno
/ 8;
4814 return (use_linux_regsets
4815 && (regs_info
->regset_bitmap
== NULL
4816 || (regs_info
->regset_bitmap
[index
] & mask
) != 0));
4819 #ifdef HAVE_LINUX_USRREGS
4822 register_addr (const struct usrregs_info
*usrregs
, int regnum
)
4826 if (regnum
< 0 || regnum
>= usrregs
->num_regs
)
4827 error ("Invalid register number %d.", regnum
);
4829 addr
= usrregs
->regmap
[regnum
];
4834 /* Fetch one register. */
4836 fetch_register (const struct usrregs_info
*usrregs
,
4837 struct regcache
*regcache
, int regno
)
4844 if (regno
>= usrregs
->num_regs
)
4846 if ((*the_low_target
.cannot_fetch_register
) (regno
))
4849 regaddr
= register_addr (usrregs
, regno
);
4853 size
= ((register_size (regcache
->tdesc
, regno
)
4854 + sizeof (PTRACE_XFER_TYPE
) - 1)
4855 & -sizeof (PTRACE_XFER_TYPE
));
4856 buf
= alloca (size
);
4858 pid
= lwpid_of (current_thread
);
4859 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4862 *(PTRACE_XFER_TYPE
*) (buf
+ i
) =
4863 ptrace (PTRACE_PEEKUSER
, pid
,
4864 /* Coerce to a uintptr_t first to avoid potential gcc warning
4865 of coercing an 8 byte integer to a 4 byte pointer. */
4866 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
, (PTRACE_TYPE_ARG4
) 0);
4867 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4869 error ("reading register %d: %s", regno
, strerror (errno
));
4872 if (the_low_target
.supply_ptrace_register
)
4873 the_low_target
.supply_ptrace_register (regcache
, regno
, buf
);
4875 supply_register (regcache
, regno
, buf
);
4878 /* Store one register. */
4880 store_register (const struct usrregs_info
*usrregs
,
4881 struct regcache
*regcache
, int regno
)
4888 if (regno
>= usrregs
->num_regs
)
4890 if ((*the_low_target
.cannot_store_register
) (regno
))
4893 regaddr
= register_addr (usrregs
, regno
);
4897 size
= ((register_size (regcache
->tdesc
, regno
)
4898 + sizeof (PTRACE_XFER_TYPE
) - 1)
4899 & -sizeof (PTRACE_XFER_TYPE
));
4900 buf
= alloca (size
);
4901 memset (buf
, 0, size
);
4903 if (the_low_target
.collect_ptrace_register
)
4904 the_low_target
.collect_ptrace_register (regcache
, regno
, buf
);
4906 collect_register (regcache
, regno
, buf
);
4908 pid
= lwpid_of (current_thread
);
4909 for (i
= 0; i
< size
; i
+= sizeof (PTRACE_XFER_TYPE
))
4912 ptrace (PTRACE_POKEUSER
, pid
,
4913 /* Coerce to a uintptr_t first to avoid potential gcc warning
4914 about coercing an 8 byte integer to a 4 byte pointer. */
4915 (PTRACE_TYPE_ARG3
) (uintptr_t) regaddr
,
4916 (PTRACE_TYPE_ARG4
) *(PTRACE_XFER_TYPE
*) (buf
+ i
));
4919 /* At this point, ESRCH should mean the process is
4920 already gone, in which case we simply ignore attempts
4921 to change its registers. See also the related
4922 comment in linux_resume_one_lwp. */
4926 if ((*the_low_target
.cannot_store_register
) (regno
) == 0)
4927 error ("writing register %d: %s", regno
, strerror (errno
));
4929 regaddr
+= sizeof (PTRACE_XFER_TYPE
);
4933 /* Fetch all registers, or just one, from the child process.
4934 If REGNO is -1, do this for all registers, skipping any that are
4935 assumed to have been retrieved by regsets_fetch_inferior_registers,
4936 unless ALL is non-zero.
4937 Otherwise, REGNO specifies which register (so we can save time). */
4939 usr_fetch_inferior_registers (const struct regs_info
*regs_info
,
4940 struct regcache
*regcache
, int regno
, int all
)
4942 struct usrregs_info
*usr
= regs_info
->usrregs
;
4946 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4947 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4948 fetch_register (usr
, regcache
, regno
);
4951 fetch_register (usr
, regcache
, regno
);
4954 /* Store our register values back into the inferior.
4955 If REGNO is -1, do this for all registers, skipping any that are
4956 assumed to have been saved by regsets_store_inferior_registers,
4957 unless ALL is non-zero.
4958 Otherwise, REGNO specifies which register (so we can save time). */
4960 usr_store_inferior_registers (const struct regs_info
*regs_info
,
4961 struct regcache
*regcache
, int regno
, int all
)
4963 struct usrregs_info
*usr
= regs_info
->usrregs
;
4967 for (regno
= 0; regno
< usr
->num_regs
; regno
++)
4968 if (all
|| !linux_register_in_regsets (regs_info
, regno
))
4969 store_register (usr
, regcache
, regno
);
4972 store_register (usr
, regcache
, regno
);
4975 #else /* !HAVE_LINUX_USRREGS */
4977 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4978 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
4984 linux_fetch_registers (struct regcache
*regcache
, int regno
)
4988 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
4992 if (the_low_target
.fetch_register
!= NULL
4993 && regs_info
->usrregs
!= NULL
)
4994 for (regno
= 0; regno
< regs_info
->usrregs
->num_regs
; regno
++)
4995 (*the_low_target
.fetch_register
) (regcache
, regno
);
4997 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
, regcache
);
4998 if (regs_info
->usrregs
!= NULL
)
4999 usr_fetch_inferior_registers (regs_info
, regcache
, -1, all
);
5003 if (the_low_target
.fetch_register
!= NULL
5004 && (*the_low_target
.fetch_register
) (regcache
, regno
))
5007 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5009 all
= regsets_fetch_inferior_registers (regs_info
->regsets_info
,
5011 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5012 usr_fetch_inferior_registers (regs_info
, regcache
, regno
, 1);
5017 linux_store_registers (struct regcache
*regcache
, int regno
)
5021 const struct regs_info
*regs_info
= (*the_low_target
.regs_info
) ();
5025 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5027 if (regs_info
->usrregs
!= NULL
)
5028 usr_store_inferior_registers (regs_info
, regcache
, regno
, all
);
5032 use_regsets
= linux_register_in_regsets (regs_info
, regno
);
5034 all
= regsets_store_inferior_registers (regs_info
->regsets_info
,
5036 if ((!use_regsets
|| all
) && regs_info
->usrregs
!= NULL
)
5037 usr_store_inferior_registers (regs_info
, regcache
, regno
, 1);
5042 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5043 to debugger memory starting at MYADDR. */
5046 linux_read_memory (CORE_ADDR memaddr
, unsigned char *myaddr
, int len
)
5048 int pid
= lwpid_of (current_thread
);
5049 register PTRACE_XFER_TYPE
*buffer
;
5050 register CORE_ADDR addr
;
5057 /* Try using /proc. Don't bother for one word. */
5058 if (len
>= 3 * sizeof (long))
5062 /* We could keep this file open and cache it - possibly one per
5063 thread. That requires some juggling, but is even faster. */
5064 sprintf (filename
, "/proc/%d/mem", pid
);
5065 fd
= open (filename
, O_RDONLY
| O_LARGEFILE
);
5069 /* If pread64 is available, use it. It's faster if the kernel
5070 supports it (only one syscall), and it's 64-bit safe even on
5071 32-bit platforms (for instance, SPARC debugging a SPARC64
5074 bytes
= pread64 (fd
, myaddr
, len
, memaddr
);
5077 if (lseek (fd
, memaddr
, SEEK_SET
) != -1)
5078 bytes
= read (fd
, myaddr
, len
);
5085 /* Some data was read, we'll try to get the rest with ptrace. */
5095 /* Round starting address down to longword boundary. */
5096 addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5097 /* Round ending address up; get number of longwords that makes. */
5098 count
= ((((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5099 / sizeof (PTRACE_XFER_TYPE
));
5100 /* Allocate buffer of that many longwords. */
5101 buffer
= (PTRACE_XFER_TYPE
*) alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5103 /* Read all the longwords */
5105 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5107 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5108 about coercing an 8 byte integer to a 4 byte pointer. */
5109 buffer
[i
] = ptrace (PTRACE_PEEKTEXT
, pid
,
5110 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5111 (PTRACE_TYPE_ARG4
) 0);
5117 /* Copy appropriate bytes out of the buffer. */
5120 i
*= sizeof (PTRACE_XFER_TYPE
);
5121 i
-= memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1);
5123 (char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5130 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5131 memory at MEMADDR. On failure (cannot write to the inferior)
5132 returns the value of errno. Always succeeds if LEN is zero. */
5135 linux_write_memory (CORE_ADDR memaddr
, const unsigned char *myaddr
, int len
)
5138 /* Round starting address down to longword boundary. */
5139 register CORE_ADDR addr
= memaddr
& -(CORE_ADDR
) sizeof (PTRACE_XFER_TYPE
);
5140 /* Round ending address up; get number of longwords that makes. */
5142 = (((memaddr
+ len
) - addr
) + sizeof (PTRACE_XFER_TYPE
) - 1)
5143 / sizeof (PTRACE_XFER_TYPE
);
5145 /* Allocate buffer of that many longwords. */
5146 register PTRACE_XFER_TYPE
*buffer
= (PTRACE_XFER_TYPE
*)
5147 alloca (count
* sizeof (PTRACE_XFER_TYPE
));
5149 int pid
= lwpid_of (current_thread
);
5153 /* Zero length write always succeeds. */
5159 /* Dump up to four bytes. */
5160 unsigned int val
= * (unsigned int *) myaddr
;
5166 val
= val
& 0xffffff;
5167 debug_printf ("Writing %0*x to 0x%08lx in process %d\n",
5168 2 * ((len
< 4) ? len
: 4), val
, (long)memaddr
, pid
);
5171 /* Fill start and end extra bytes of buffer with existing memory data. */
5174 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5175 about coercing an 8 byte integer to a 4 byte pointer. */
5176 buffer
[0] = ptrace (PTRACE_PEEKTEXT
, pid
,
5177 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5178 (PTRACE_TYPE_ARG4
) 0);
5186 = ptrace (PTRACE_PEEKTEXT
, pid
,
5187 /* Coerce to a uintptr_t first to avoid potential gcc warning
5188 about coercing an 8 byte integer to a 4 byte pointer. */
5189 (PTRACE_TYPE_ARG3
) (uintptr_t) (addr
+ (count
- 1)
5190 * sizeof (PTRACE_XFER_TYPE
)),
5191 (PTRACE_TYPE_ARG4
) 0);
5196 /* Copy data to be written over corresponding part of buffer. */
5198 memcpy ((char *) buffer
+ (memaddr
& (sizeof (PTRACE_XFER_TYPE
) - 1)),
5201 /* Write the entire buffer. */
5203 for (i
= 0; i
< count
; i
++, addr
+= sizeof (PTRACE_XFER_TYPE
))
5206 ptrace (PTRACE_POKETEXT
, pid
,
5207 /* Coerce to a uintptr_t first to avoid potential gcc warning
5208 about coercing an 8 byte integer to a 4 byte pointer. */
5209 (PTRACE_TYPE_ARG3
) (uintptr_t) addr
,
5210 (PTRACE_TYPE_ARG4
) buffer
[i
]);
5219 linux_look_up_symbols (void)
5221 #ifdef USE_THREAD_DB
5222 struct process_info
*proc
= current_process ();
5224 if (proc
->priv
->thread_db
!= NULL
)
5227 /* If the kernel supports tracing clones, then we don't need to
5228 use the magic thread event breakpoint to learn about
5230 thread_db_init (!linux_supports_traceclone ());
5235 linux_request_interrupt (void)
5237 extern unsigned long signal_pid
;
5239 /* Send a SIGINT to the process group. This acts just like the user
5240 typed a ^C on the controlling terminal. */
5241 kill (-signal_pid
, SIGINT
);
5244 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5245 to debugger memory starting at MYADDR. */
5248 linux_read_auxv (CORE_ADDR offset
, unsigned char *myaddr
, unsigned int len
)
5250 char filename
[PATH_MAX
];
5252 int pid
= lwpid_of (current_thread
);
5254 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5256 fd
= open (filename
, O_RDONLY
);
5260 if (offset
!= (CORE_ADDR
) 0
5261 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5264 n
= read (fd
, myaddr
, len
);
5271 /* These breakpoint and watchpoint related wrapper functions simply
5272 pass on the function call if the target has registered a
5273 corresponding function. */
5276 linux_supports_z_point_type (char z_type
)
5278 return (the_low_target
.supports_z_point_type
!= NULL
5279 && the_low_target
.supports_z_point_type (z_type
));
5283 linux_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5284 int size
, struct raw_breakpoint
*bp
)
5286 if (type
== raw_bkpt_type_sw
)
5287 return insert_memory_breakpoint (bp
);
5288 else if (the_low_target
.insert_point
!= NULL
)
5289 return the_low_target
.insert_point (type
, addr
, size
, bp
);
5291 /* Unsupported (see target.h). */
5296 linux_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
5297 int size
, struct raw_breakpoint
*bp
)
5299 if (type
== raw_bkpt_type_sw
)
5300 return remove_memory_breakpoint (bp
);
5301 else if (the_low_target
.remove_point
!= NULL
)
5302 return the_low_target
.remove_point (type
, addr
, size
, bp
);
5304 /* Unsupported (see target.h). */
5308 /* Implement the to_stopped_by_sw_breakpoint target_ops
5312 linux_stopped_by_sw_breakpoint (void)
5314 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5316 return (lwp
->stop_reason
== TARGET_STOPPED_BY_SW_BREAKPOINT
);
5319 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5323 linux_supports_stopped_by_sw_breakpoint (void)
5325 return USE_SIGTRAP_SIGINFO
;
5328 /* Implement the to_stopped_by_hw_breakpoint target_ops
5332 linux_stopped_by_hw_breakpoint (void)
5334 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5336 return (lwp
->stop_reason
== TARGET_STOPPED_BY_HW_BREAKPOINT
);
5339 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5343 linux_supports_stopped_by_hw_breakpoint (void)
5345 return USE_SIGTRAP_SIGINFO
;
5348 /* Implement the supports_conditional_breakpoints target_ops
5352 linux_supports_conditional_breakpoints (void)
5354 /* GDBserver needs to step over the breakpoint if the condition is
5355 false. GDBserver software single step is too simple, so disable
5356 conditional breakpoints if the target doesn't have hardware single
5358 return can_hardware_single_step ();
5362 linux_stopped_by_watchpoint (void)
5364 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5366 return lwp
->stop_reason
== TARGET_STOPPED_BY_WATCHPOINT
;
5370 linux_stopped_data_address (void)
5372 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
5374 return lwp
->stopped_data_address
;
5377 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5378 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5379 && defined(PT_TEXT_END_ADDR)
5381 /* This is only used for targets that define PT_TEXT_ADDR,
5382 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5383 the target has different ways of acquiring this information, like
5386 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5387 to tell gdb about. */
5390 linux_read_offsets (CORE_ADDR
*text_p
, CORE_ADDR
*data_p
)
5392 unsigned long text
, text_end
, data
;
5393 int pid
= lwpid_of (current_thread
);
5397 text
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_ADDR
,
5398 (PTRACE_TYPE_ARG4
) 0);
5399 text_end
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_TEXT_END_ADDR
,
5400 (PTRACE_TYPE_ARG4
) 0);
5401 data
= ptrace (PTRACE_PEEKUSER
, pid
, (PTRACE_TYPE_ARG3
) PT_DATA_ADDR
,
5402 (PTRACE_TYPE_ARG4
) 0);
5406 /* Both text and data offsets produced at compile-time (and so
5407 used by gdb) are relative to the beginning of the program,
5408 with the data segment immediately following the text segment.
5409 However, the actual runtime layout in memory may put the data
5410 somewhere else, so when we send gdb a data base-address, we
5411 use the real data base address and subtract the compile-time
5412 data base-address from it (which is just the length of the
5413 text segment). BSS immediately follows data in both
5416 *data_p
= data
- (text_end
- text
);
5425 linux_qxfer_osdata (const char *annex
,
5426 unsigned char *readbuf
, unsigned const char *writebuf
,
5427 CORE_ADDR offset
, int len
)
5429 return linux_common_xfer_osdata (annex
, readbuf
, offset
, len
);
5432 /* Convert a native/host siginfo object, into/from the siginfo in the
5433 layout of the inferiors' architecture. */
5436 siginfo_fixup (siginfo_t
*siginfo
, void *inf_siginfo
, int direction
)
5440 if (the_low_target
.siginfo_fixup
!= NULL
)
5441 done
= the_low_target
.siginfo_fixup (siginfo
, inf_siginfo
, direction
);
5443 /* If there was no callback, or the callback didn't do anything,
5444 then just do a straight memcpy. */
5448 memcpy (siginfo
, inf_siginfo
, sizeof (siginfo_t
));
5450 memcpy (inf_siginfo
, siginfo
, sizeof (siginfo_t
));
5455 linux_xfer_siginfo (const char *annex
, unsigned char *readbuf
,
5456 unsigned const char *writebuf
, CORE_ADDR offset
, int len
)
5460 char inf_siginfo
[sizeof (siginfo_t
)];
5462 if (current_thread
== NULL
)
5465 pid
= lwpid_of (current_thread
);
5468 debug_printf ("%s siginfo for lwp %d.\n",
5469 readbuf
!= NULL
? "Reading" : "Writing",
5472 if (offset
>= sizeof (siginfo
))
5475 if (ptrace (PTRACE_GETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5478 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
5479 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
5480 inferior with a 64-bit GDBSERVER should look the same as debugging it
5481 with a 32-bit GDBSERVER, we need to convert it. */
5482 siginfo_fixup (&siginfo
, inf_siginfo
, 0);
5484 if (offset
+ len
> sizeof (siginfo
))
5485 len
= sizeof (siginfo
) - offset
;
5487 if (readbuf
!= NULL
)
5488 memcpy (readbuf
, inf_siginfo
+ offset
, len
);
5491 memcpy (inf_siginfo
+ offset
, writebuf
, len
);
5493 /* Convert back to ptrace layout before flushing it out. */
5494 siginfo_fixup (&siginfo
, inf_siginfo
, 1);
5496 if (ptrace (PTRACE_SETSIGINFO
, pid
, (PTRACE_TYPE_ARG3
) 0, &siginfo
) != 0)
5503 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
5504 so we notice when children change state; as the handler for the
5505 sigsuspend in my_waitpid. */
5508 sigchld_handler (int signo
)
5510 int old_errno
= errno
;
5516 /* fprintf is not async-signal-safe, so call write
5518 if (write (2, "sigchld_handler\n",
5519 sizeof ("sigchld_handler\n") - 1) < 0)
5520 break; /* just ignore */
5524 if (target_is_async_p ())
5525 async_file_mark (); /* trigger a linux_wait */
5531 linux_supports_non_stop (void)
5537 linux_async (int enable
)
5539 int previous
= target_is_async_p ();
5542 debug_printf ("linux_async (%d), previous=%d\n",
5545 if (previous
!= enable
)
5548 sigemptyset (&mask
);
5549 sigaddset (&mask
, SIGCHLD
);
5551 sigprocmask (SIG_BLOCK
, &mask
, NULL
);
5555 if (pipe (linux_event_pipe
) == -1)
5557 linux_event_pipe
[0] = -1;
5558 linux_event_pipe
[1] = -1;
5559 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5561 warning ("creating event pipe failed.");
5565 fcntl (linux_event_pipe
[0], F_SETFL
, O_NONBLOCK
);
5566 fcntl (linux_event_pipe
[1], F_SETFL
, O_NONBLOCK
);
5568 /* Register the event loop handler. */
5569 add_file_handler (linux_event_pipe
[0],
5570 handle_target_event
, NULL
);
5572 /* Always trigger a linux_wait. */
5577 delete_file_handler (linux_event_pipe
[0]);
5579 close (linux_event_pipe
[0]);
5580 close (linux_event_pipe
[1]);
5581 linux_event_pipe
[0] = -1;
5582 linux_event_pipe
[1] = -1;
5585 sigprocmask (SIG_UNBLOCK
, &mask
, NULL
);
5592 linux_start_non_stop (int nonstop
)
5594 /* Register or unregister from event-loop accordingly. */
5595 linux_async (nonstop
);
5597 if (target_is_async_p () != (nonstop
!= 0))
5604 linux_supports_multi_process (void)
5609 /* Check if fork events are supported. */
5612 linux_supports_fork_events (void)
5614 return linux_supports_tracefork ();
5617 /* Check if vfork events are supported. */
5620 linux_supports_vfork_events (void)
5622 return linux_supports_tracefork ();
5625 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
5626 options for the specified lwp. */
5629 reset_lwp_ptrace_options_callback (struct inferior_list_entry
*entry
,
5632 struct thread_info
*thread
= (struct thread_info
*) entry
;
5633 struct lwp_info
*lwp
= get_thread_lwp (thread
);
5637 /* Stop the lwp so we can modify its ptrace options. */
5638 lwp
->must_set_ptrace_flags
= 1;
5639 linux_stop_lwp (lwp
);
5643 /* Already stopped; go ahead and set the ptrace options. */
5644 struct process_info
*proc
= find_process_pid (pid_of (thread
));
5645 int options
= linux_low_ptrace_options (proc
->attached
);
5647 linux_enable_event_reporting (lwpid_of (thread
), options
);
5648 lwp
->must_set_ptrace_flags
= 0;
5654 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
5655 ptrace flags for all inferiors. This is in case the new GDB connection
5656 doesn't support the same set of events that the previous one did. */
5659 linux_handle_new_gdb_connection (void)
5663 /* Request that all the lwps reset their ptrace options. */
5664 find_inferior (&all_threads
, reset_lwp_ptrace_options_callback
, &pid
);
5668 linux_supports_disable_randomization (void)
5670 #ifdef HAVE_PERSONALITY
5678 linux_supports_agent (void)
5684 linux_supports_range_stepping (void)
5686 if (*the_low_target
.supports_range_stepping
== NULL
)
5689 return (*the_low_target
.supports_range_stepping
) ();
5692 /* Enumerate spufs IDs for process PID. */
5694 spu_enumerate_spu_ids (long pid
, unsigned char *buf
, CORE_ADDR offset
, int len
)
5700 struct dirent
*entry
;
5702 sprintf (path
, "/proc/%ld/fd", pid
);
5703 dir
= opendir (path
);
5708 while ((entry
= readdir (dir
)) != NULL
)
5714 fd
= atoi (entry
->d_name
);
5718 sprintf (path
, "/proc/%ld/fd/%d", pid
, fd
);
5719 if (stat (path
, &st
) != 0)
5721 if (!S_ISDIR (st
.st_mode
))
5724 if (statfs (path
, &stfs
) != 0)
5726 if (stfs
.f_type
!= SPUFS_MAGIC
)
5729 if (pos
>= offset
&& pos
+ 4 <= offset
+ len
)
5731 *(unsigned int *)(buf
+ pos
- offset
) = fd
;
5741 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
5742 object type, using the /proc file system. */
5744 linux_qxfer_spu (const char *annex
, unsigned char *readbuf
,
5745 unsigned const char *writebuf
,
5746 CORE_ADDR offset
, int len
)
5748 long pid
= lwpid_of (current_thread
);
5753 if (!writebuf
&& !readbuf
)
5761 return spu_enumerate_spu_ids (pid
, readbuf
, offset
, len
);
5764 sprintf (buf
, "/proc/%ld/fd/%s", pid
, annex
);
5765 fd
= open (buf
, writebuf
? O_WRONLY
: O_RDONLY
);
5770 && lseek (fd
, (off_t
) offset
, SEEK_SET
) != (off_t
) offset
)
5777 ret
= write (fd
, writebuf
, (size_t) len
);
5779 ret
= read (fd
, readbuf
, (size_t) len
);
5785 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
5786 struct target_loadseg
5788 /* Core address to which the segment is mapped. */
5790 /* VMA recorded in the program header. */
5792 /* Size of this segment in memory. */
5796 # if defined PT_GETDSBT
5797 struct target_loadmap
5799 /* Protocol version number, must be zero. */
5801 /* Pointer to the DSBT table, its size, and the DSBT index. */
5802 unsigned *dsbt_table
;
5803 unsigned dsbt_size
, dsbt_index
;
5804 /* Number of segments in this map. */
5806 /* The actual memory map. */
5807 struct target_loadseg segs
[/*nsegs*/];
5809 # define LINUX_LOADMAP PT_GETDSBT
5810 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
5811 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
5813 struct target_loadmap
5815 /* Protocol version number, must be zero. */
5817 /* Number of segments in this map. */
5819 /* The actual memory map. */
5820 struct target_loadseg segs
[/*nsegs*/];
5822 # define LINUX_LOADMAP PTRACE_GETFDPIC
5823 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
5824 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
5828 linux_read_loadmap (const char *annex
, CORE_ADDR offset
,
5829 unsigned char *myaddr
, unsigned int len
)
5831 int pid
= lwpid_of (current_thread
);
5833 struct target_loadmap
*data
= NULL
;
5834 unsigned int actual_length
, copy_length
;
5836 if (strcmp (annex
, "exec") == 0)
5837 addr
= (int) LINUX_LOADMAP_EXEC
;
5838 else if (strcmp (annex
, "interp") == 0)
5839 addr
= (int) LINUX_LOADMAP_INTERP
;
5843 if (ptrace (LINUX_LOADMAP
, pid
, addr
, &data
) != 0)
5849 actual_length
= sizeof (struct target_loadmap
)
5850 + sizeof (struct target_loadseg
) * data
->nsegs
;
5852 if (offset
< 0 || offset
> actual_length
)
5855 copy_length
= actual_length
- offset
< len
? actual_length
- offset
: len
;
5856 memcpy (myaddr
, (char *) data
+ offset
, copy_length
);
5860 # define linux_read_loadmap NULL
5861 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
5864 linux_process_qsupported (const char *query
)
5866 if (the_low_target
.process_qsupported
!= NULL
)
5867 the_low_target
.process_qsupported (query
);
5871 linux_supports_tracepoints (void)
5873 if (*the_low_target
.supports_tracepoints
== NULL
)
5876 return (*the_low_target
.supports_tracepoints
) ();
5880 linux_read_pc (struct regcache
*regcache
)
5882 if (the_low_target
.get_pc
== NULL
)
5885 return (*the_low_target
.get_pc
) (regcache
);
5889 linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
5891 gdb_assert (the_low_target
.set_pc
!= NULL
);
5893 (*the_low_target
.set_pc
) (regcache
, pc
);
5897 linux_thread_stopped (struct thread_info
*thread
)
5899 return get_thread_lwp (thread
)->stopped
;
5902 /* This exposes stop-all-threads functionality to other modules. */
5905 linux_pause_all (int freeze
)
5907 stop_all_lwps (freeze
, NULL
);
5910 /* This exposes unstop-all-threads functionality to other gdbserver
5914 linux_unpause_all (int unfreeze
)
5916 unstop_all_lwps (unfreeze
, NULL
);
5920 linux_prepare_to_access_memory (void)
5922 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5925 linux_pause_all (1);
5930 linux_done_accessing_memory (void)
5932 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
5935 linux_unpause_all (1);
5939 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint
, CORE_ADDR tpaddr
,
5940 CORE_ADDR collector
,
5943 CORE_ADDR
*jump_entry
,
5944 CORE_ADDR
*trampoline
,
5945 ULONGEST
*trampoline_size
,
5946 unsigned char *jjump_pad_insn
,
5947 ULONGEST
*jjump_pad_insn_size
,
5948 CORE_ADDR
*adjusted_insn_addr
,
5949 CORE_ADDR
*adjusted_insn_addr_end
,
5952 return (*the_low_target
.install_fast_tracepoint_jump_pad
)
5953 (tpoint
, tpaddr
, collector
, lockaddr
, orig_size
,
5954 jump_entry
, trampoline
, trampoline_size
,
5955 jjump_pad_insn
, jjump_pad_insn_size
,
5956 adjusted_insn_addr
, adjusted_insn_addr_end
,
5960 static struct emit_ops
*
5961 linux_emit_ops (void)
5963 if (the_low_target
.emit_ops
!= NULL
)
5964 return (*the_low_target
.emit_ops
) ();
5970 linux_get_min_fast_tracepoint_insn_len (void)
5972 return (*the_low_target
.get_min_fast_tracepoint_insn_len
) ();
5975 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
5978 get_phdr_phnum_from_proc_auxv (const int pid
, const int is_elf64
,
5979 CORE_ADDR
*phdr_memaddr
, int *num_phdr
)
5981 char filename
[PATH_MAX
];
5983 const int auxv_size
= is_elf64
5984 ? sizeof (Elf64_auxv_t
) : sizeof (Elf32_auxv_t
);
5985 char buf
[sizeof (Elf64_auxv_t
)]; /* The larger of the two. */
5987 xsnprintf (filename
, sizeof filename
, "/proc/%d/auxv", pid
);
5989 fd
= open (filename
, O_RDONLY
);
5995 while (read (fd
, buf
, auxv_size
) == auxv_size
5996 && (*phdr_memaddr
== 0 || *num_phdr
== 0))
6000 Elf64_auxv_t
*const aux
= (Elf64_auxv_t
*) buf
;
6002 switch (aux
->a_type
)
6005 *phdr_memaddr
= aux
->a_un
.a_val
;
6008 *num_phdr
= aux
->a_un
.a_val
;
6014 Elf32_auxv_t
*const aux
= (Elf32_auxv_t
*) buf
;
6016 switch (aux
->a_type
)
6019 *phdr_memaddr
= aux
->a_un
.a_val
;
6022 *num_phdr
= aux
->a_un
.a_val
;
6030 if (*phdr_memaddr
== 0 || *num_phdr
== 0)
6032 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6033 "phdr_memaddr = %ld, phdr_num = %d",
6034 (long) *phdr_memaddr
, *num_phdr
);
6041 /* Linearly traverse pheaders and look for P_TYPE pheader. */
6044 find_phdr (const int is_elf64
, const void *const phdr_begin
,
6045 const void *const phdr_end
, const ULONGEST p_type
)
6047 #define PHDR_NEXT(hdrp) ((const void *) ((const gdb_byte *) (hdrp) + \
6048 ELFXX_SIZEOF (is_elf64, *hdrp)))
6050 const ElfXX_Phdr
*phdr
= phdr_begin
;
6052 while (PHDR_NEXT (phdr
) <= phdr_end
)
6054 if (ELFXX_FLD (is_elf64
, *phdr
, p_type
) == p_type
)
6056 phdr
= PHDR_NEXT (phdr
);
6063 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6066 get_dynamic (const int pid
, const int is_elf64
)
6068 CORE_ADDR phdr_memaddr
, relocation
;
6070 unsigned char *phdr_buf
;
6071 const ElfXX_Phdr
*phdr
;
6072 const int phdr_size
= ELFXX_SIZEOF (is_elf64
, *phdr
);
6074 if (get_phdr_phnum_from_proc_auxv (pid
, is_elf64
, &phdr_memaddr
, &num_phdr
))
6077 gdb_assert (num_phdr
< 100); /* Basic sanity check. */
6078 phdr_buf
= alloca (num_phdr
* phdr_size
);
6080 if (linux_read_memory (phdr_memaddr
, phdr_buf
, num_phdr
* phdr_size
))
6083 /* Compute relocation: it is expected to be 0 for "regular" executables,
6084 non-zero for PIE ones. */
6086 phdr
= find_phdr (is_elf64
, phdr_buf
, phdr_buf
+ num_phdr
* phdr_size
,
6089 relocation
= phdr_memaddr
- ELFXX_FLD (is_elf64
, *phdr
, p_vaddr
);
6090 if (relocation
== -1)
6092 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6093 any real world executables, including PIE executables, have always
6094 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6095 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6096 or present DT_DEBUG anyway (fpc binaries are statically linked).
6098 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6100 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6105 phdr
= find_phdr (is_elf64
, phdr_buf
, phdr_buf
+ num_phdr
* phdr_size
,
6109 return ELFXX_FLD (is_elf64
, *phdr
, p_vaddr
) + relocation
;
6114 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6115 can be 0 if the inferior does not yet have the library list initialized.
6116 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6117 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6120 get_r_debug (const int pid
, const int is_elf64
)
6122 CORE_ADDR dynamic_memaddr
;
6123 const int dyn_size
= is_elf64
? sizeof (Elf64_Dyn
) : sizeof (Elf32_Dyn
);
6124 unsigned char buf
[sizeof (Elf64_Dyn
)]; /* The larger of the two. */
6127 dynamic_memaddr
= get_dynamic (pid
, is_elf64
);
6128 if (dynamic_memaddr
== 0)
6131 while (linux_read_memory (dynamic_memaddr
, buf
, dyn_size
) == 0)
6135 Elf64_Dyn
*const dyn
= (Elf64_Dyn
*) buf
;
6136 #ifdef DT_MIPS_RLD_MAP
6140 unsigned char buf
[sizeof (Elf64_Xword
)];
6144 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6146 if (linux_read_memory (dyn
->d_un
.d_val
,
6147 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6152 #endif /* DT_MIPS_RLD_MAP */
6154 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6155 map
= dyn
->d_un
.d_val
;
6157 if (dyn
->d_tag
== DT_NULL
)
6162 Elf32_Dyn
*const dyn
= (Elf32_Dyn
*) buf
;
6163 #ifdef DT_MIPS_RLD_MAP
6167 unsigned char buf
[sizeof (Elf32_Word
)];
6171 if (dyn
->d_tag
== DT_MIPS_RLD_MAP
)
6173 if (linux_read_memory (dyn
->d_un
.d_val
,
6174 rld_map
.buf
, sizeof (rld_map
.buf
)) == 0)
6179 #endif /* DT_MIPS_RLD_MAP */
6181 if (dyn
->d_tag
== DT_DEBUG
&& map
== -1)
6182 map
= dyn
->d_un
.d_val
;
6184 if (dyn
->d_tag
== DT_NULL
)
6188 dynamic_memaddr
+= dyn_size
;
6194 /* Read one pointer from MEMADDR in the inferior. */
6197 read_one_ptr (CORE_ADDR memaddr
, CORE_ADDR
*ptr
, int ptr_size
)
6201 /* Go through a union so this works on either big or little endian
6202 hosts, when the inferior's pointer size is smaller than the size
6203 of CORE_ADDR. It is assumed the inferior's endianness is the
6204 same of the superior's. */
6207 CORE_ADDR core_addr
;
6212 ret
= linux_read_memory (memaddr
, &addr
.uc
, ptr_size
);
6215 if (ptr_size
== sizeof (CORE_ADDR
))
6216 *ptr
= addr
.core_addr
;
6217 else if (ptr_size
== sizeof (unsigned int))
6220 gdb_assert_not_reached ("unhandled pointer size");
6225 struct link_map_offsets
6227 /* Offset and size of r_debug.r_version. */
6228 int r_version_offset
;
6230 /* Offset and size of r_debug.r_map. */
6233 /* Offset to l_addr field in struct link_map. */
6236 /* Offset to l_name field in struct link_map. */
6239 /* Offset to l_ld field in struct link_map. */
6242 /* Offset to l_next field in struct link_map. */
6245 /* Offset to l_prev field in struct link_map. */
6250 /* Structure for holding a mapping. Only mapping
6251 containing l_ld can have hex_build_id set. */
6253 struct mapping_entry
6255 /* Fields are populated from linux_find_memory_region parameters. */
6262 /* Hex encoded string allocated using xmalloc, and
6263 needs to be freed. It can be NULL. */
6268 typedef struct mapping_entry mapping_entry_s
;
6270 DEF_VEC_O(mapping_entry_s
);
6272 /* Free vector of mapping_entry_s objects. */
6275 free_mapping_entry_vec (VEC (mapping_entry_s
) *lst
)
6280 for (ix
= 0; VEC_iterate (mapping_entry_s
, lst
, ix
, p
); ++ix
)
6281 xfree (p
->hex_build_id
);
6283 VEC_free (mapping_entry_s
, lst
);
6286 /* Used for finding a mapping containing the given
6287 l_ld passed in K. */
6290 compare_mapping_entry_range (const void *const k
, const void *const b
)
6292 const ULONGEST key
= *(const CORE_ADDR
*) k
;
6293 const mapping_entry_s
*const p
= b
;
6298 if (key
< p
->vaddr
+ p
->size
)
6304 struct find_memory_region_callback_data
6308 /* Return. Must be freed with free_mapping_entry_vec. */
6309 VEC (mapping_entry_s
) *list
;
6312 /* Read build-id from PT_NOTE.
6313 Argument LOAD_ADDR represents run time virtual address corresponding to
6314 the beginning of the first loadable segment. L_ADDR is displacement
6315 as supplied by the dynamic linker. */
6318 read_build_id (struct find_memory_region_callback_data
*const p
,
6319 mapping_entry_s
*const bil
, const CORE_ADDR load_addr
,
6320 const CORE_ADDR l_addr
)
6322 const int is_elf64
= p
->is_elf64
;
6325 if (linux_read_memory (load_addr
, (unsigned char *) &ehdr
,
6326 ELFXX_SIZEOF (is_elf64
, ehdr
)) == 0
6327 && ELFXX_FLD (is_elf64
, ehdr
, e_ident
[EI_MAG0
]) == ELFMAG0
6328 && ELFXX_FLD (is_elf64
, ehdr
, e_ident
[EI_MAG1
]) == ELFMAG1
6329 && ELFXX_FLD (is_elf64
, ehdr
, e_ident
[EI_MAG2
]) == ELFMAG2
6330 && ELFXX_FLD (is_elf64
, ehdr
, e_ident
[EI_MAG3
]) == ELFMAG3
)
6332 const ElfXX_Phdr
*phdr
;
6334 const unsigned e_phentsize
= ELFXX_FLD (is_elf64
, ehdr
, e_phentsize
);
6336 if (ELFXX_FLD (is_elf64
, ehdr
, e_phnum
) >= 100
6337 || e_phentsize
!= ELFXX_SIZEOF (is_elf64
, *phdr
))
6339 /* Basic sanity check failed. */
6340 warning (_("Could not identify program header at %s."),
6341 paddress (load_addr
));
6345 phdr_buf
= alloca (ELFXX_FLD (is_elf64
, ehdr
, e_phnum
) * e_phentsize
);
6347 if (linux_read_memory (load_addr
+ ELFXX_FLD (is_elf64
, ehdr
, e_phoff
),
6349 ELFXX_FLD (is_elf64
, ehdr
, e_phnum
) * e_phentsize
)
6352 warning (_("Could not read program header at %s."),
6353 paddress (load_addr
));
6362 const gdb_byte
*pt_end
;
6363 const ElfXX_Nhdr
*nhdr
;
6364 CORE_ADDR note_addr
;
6366 phdr
= find_phdr (p
->is_elf64
, phdr
, (gdb_byte
*) phdr_buf
6367 + ELFXX_FLD (is_elf64
, ehdr
, e_phnum
) * e_phentsize
,
6371 pt_note
= xmalloc (ELFXX_FLD (is_elf64
, *phdr
, p_memsz
));
6372 note_addr
= ELFXX_FLD (is_elf64
, *phdr
, p_vaddr
) + l_addr
;
6373 if (linux_read_memory (note_addr
, pt_note
,
6374 ELFXX_FLD (is_elf64
, *phdr
, p_memsz
)) != 0)
6377 warning (_("Could not read note at address 0x%s"),
6378 paddress (note_addr
));
6382 pt_end
= pt_note
+ ELFXX_FLD (is_elf64
, *phdr
, p_memsz
);
6383 nhdr
= (void *) pt_note
;
6384 while ((const gdb_byte
*) nhdr
< pt_end
)
6387 = ELFXX_ROUNDUP_4 (is_elf64
, ELFXX_FLD (is_elf64
, *nhdr
,
6390 = ELFXX_ROUNDUP_4 (is_elf64
, ELFXX_FLD (is_elf64
, *nhdr
,
6392 const size_t note_sz
= (ELFXX_SIZEOF (is_elf64
, *nhdr
) + namesz
6395 if (((const gdb_byte
*) nhdr
+ note_sz
) > pt_end
|| note_sz
== 0
6398 warning (_("Malformed PT_NOTE at address 0x%s\n"),
6399 paddress (note_addr
+ (gdb_byte
*) nhdr
- pt_note
));
6402 if (ELFXX_FLD (is_elf64
, *nhdr
, n_type
) == NT_GNU_BUILD_ID
6403 && ELFXX_FLD (is_elf64
, *nhdr
, n_namesz
) == 4)
6405 const char gnu
[4] = "GNU\0";
6406 const char *const pname
6407 = (char *) nhdr
+ ELFXX_SIZEOF (is_elf64
, *nhdr
);
6409 if (memcmp (pname
, gnu
, 4) == 0)
6411 const size_t n_descsz
= ELFXX_FLD (is_elf64
, *nhdr
,
6414 bil
->hex_build_id
= xmalloc (n_descsz
* 2 + 1);
6415 bin2hex ((const gdb_byte
*) pname
+ namesz
,
6416 bil
->hex_build_id
, n_descsz
);
6421 nhdr
= (void *) ((gdb_byte
*) nhdr
+ note_sz
);
6428 static linux_find_memory_region_ftype find_memory_region_callback
;
6430 /* Add mapping_entry. See linux_find_memory_ftype for the parameters
6434 find_memory_region_callback (ULONGEST vaddr
, ULONGEST size
, ULONGEST offset
,
6435 ULONGEST inode
, int read
, int write
, int exec
,
6436 int modified
, const char *filename
, void *data
)
6440 struct find_memory_region_callback_data
*const p
= data
;
6441 mapping_entry_s bil
;
6445 bil
.offset
= offset
;
6447 bil
.hex_build_id
= NULL
;
6449 VEC_safe_push (mapping_entry_s
, p
->list
, &bil
);
6452 /* Continue the traversal. */
6456 /* Linear reverse find starting from RBEGIN towards REND looking for
6457 the lowest vaddr mapping of the same inode and zero offset. */
6459 static mapping_entry_s
*
6460 lrfind_mapping_entry (mapping_entry_s
*const rbegin
,
6461 const mapping_entry_s
*const rend
)
6465 for (p
= rbegin
- 1; p
>= rend
; --p
)
6466 if (p
->offset
== 0 && p
->inode
== rbegin
->inode
)
6472 /* Get build-id for the given L_LD, where L_LD corresponds to
6473 link_map.l_ld as specified by the dynamic linker.
6474 DATA must point to already filled list of mapping_entry elements.
6476 If build-id had not been read, read it and cache in corresponding
6479 Return build_id as stored in the list element corresponding
6482 NULL may be returned if build-id could not be fetched.
6484 Returned string must not be freed explicitly. */
6487 get_hex_build_id (const CORE_ADDR l_addr
, const CORE_ADDR l_ld
,
6488 struct find_memory_region_callback_data
*const data
)
6490 mapping_entry_s
*bil
;
6492 bil
= bsearch (&l_ld
, VEC_address (mapping_entry_s
, data
->list
),
6493 VEC_length (mapping_entry_s
, data
->list
),
6494 sizeof (mapping_entry_s
), compare_mapping_entry_range
);
6499 if (bil
->hex_build_id
== NULL
)
6501 mapping_entry_s
*bil_min
;
6503 bil_min
= lrfind_mapping_entry (bil
, VEC_address (mapping_entry_s
,
6505 if (bil_min
!= NULL
)
6506 read_build_id (data
, bil
, bil_min
->vaddr
, l_addr
);
6509 /* Do not try to find hex_build_id again. */
6510 bil
->hex_build_id
= xstrdup (BUILD_ID_INVALID
);
6511 warning (_("Could not determine load address; mapping entry with "
6512 "offset 0 corresponding to l_ld = 0x%s could not be "
6513 "found; build-id can not be used."),
6518 return bil
->hex_build_id
;
6521 /* Construct qXfer:libraries-svr4:read reply. */
6524 linux_qxfer_libraries_svr4 (const char *annex
, unsigned char *readbuf
,
6525 unsigned const char *writebuf
,
6526 CORE_ADDR offset
, int len
)
6529 unsigned document_len
;
6530 struct process_info_private
*const priv
= current_process ()->priv
;
6531 char filename
[PATH_MAX
];
6533 struct find_memory_region_callback_data data
;
6535 /* COREFILTER_ANON_PRIVATE and COREFILTER_ANON_SHARED do not have an
6536 associated file so it is not expected it could have an ELF header. */
6537 const enum filterflags filterflags
= (COREFILTER_MAPPED_PRIVATE
6538 | COREFILTER_MAPPED_SHARED
6539 | COREFILTER_ELF_HEADERS
6540 | COREFILTER_HUGETLB_PRIVATE
6541 | COREFILTER_HUGETLB_SHARED
);
6543 static const struct link_map_offsets lmo_32bit_offsets
=
6545 0, /* r_version offset. */
6546 4, /* r_debug.r_map offset. */
6547 0, /* l_addr offset in link_map. */
6548 4, /* l_name offset in link_map. */
6549 8, /* l_ld offset in link_map. */
6550 12, /* l_next offset in link_map. */
6551 16 /* l_prev offset in link_map. */
6554 static const struct link_map_offsets lmo_64bit_offsets
=
6556 0, /* r_version offset. */
6557 8, /* r_debug.r_map offset. */
6558 0, /* l_addr offset in link_map. */
6559 8, /* l_name offset in link_map. */
6560 16, /* l_ld offset in link_map. */
6561 24, /* l_next offset in link_map. */
6562 32 /* l_prev offset in link_map. */
6564 const struct link_map_offsets
*lmo
;
6565 unsigned int machine
;
6567 CORE_ADDR lm_addr
= 0, lm_prev
= 0;
6568 int allocated
= 1024;
6570 CORE_ADDR l_name
, l_addr
, l_ld
, l_next
, l_prev
;
6571 int header_done
= 0;
6573 if (writebuf
!= NULL
)
6575 if (readbuf
== NULL
)
6578 pid
= lwpid_of (current_thread
);
6579 xsnprintf (filename
, sizeof filename
, "/proc/%d/exe", pid
);
6580 is_elf64
= elf_64_file_p (filename
, &machine
);
6581 lmo
= is_elf64
? &lmo_64bit_offsets
: &lmo_32bit_offsets
;
6582 ptr_size
= is_elf64
? 8 : 4;
6584 data
.is_elf64
= is_elf64
;
6586 VEC_reserve (mapping_entry_s
, data
.list
, 16);
6587 if (linux_find_memory_regions_full (pid
, filterflags
,
6588 find_memory_region_callback
, &data
)
6590 warning (_("Finding memory regions failed"));
6592 while (annex
[0] != '\0')
6598 sep
= strchr (annex
, '=');
6603 if (len
== 5 && startswith (annex
, "start"))
6605 else if (len
== 4 && startswith (annex
, "prev"))
6609 annex
= strchr (sep
, ';');
6616 annex
= decode_address_to_semicolon (addrp
, sep
+ 1);
6623 if (priv
->r_debug
== 0)
6624 priv
->r_debug
= get_r_debug (pid
, is_elf64
);
6626 /* We failed to find DT_DEBUG. Such situation will not change
6627 for this inferior - do not retry it. Report it to GDB as
6628 E01, see for the reasons at the GDB solib-svr4.c side. */
6629 if (priv
->r_debug
== (CORE_ADDR
) -1)
6632 if (priv
->r_debug
!= 0)
6634 if (linux_read_memory (priv
->r_debug
+ lmo
->r_version_offset
,
6635 (unsigned char *) &r_version
,
6636 sizeof (r_version
)) != 0
6639 warning ("unexpected r_debug version %d", r_version
);
6641 else if (read_one_ptr (priv
->r_debug
+ lmo
->r_map_offset
,
6642 &lm_addr
, ptr_size
) != 0)
6644 warning ("unable to read r_map from 0x%lx",
6645 (long) priv
->r_debug
+ lmo
->r_map_offset
);
6650 document
= xmalloc (allocated
);
6651 strcpy (document
, "<library-list-svr4 version=\"1.0\"");
6652 p
= document
+ strlen (document
);
6655 && read_one_ptr (lm_addr
+ lmo
->l_name_offset
,
6656 &l_name
, ptr_size
) == 0
6657 && read_one_ptr (lm_addr
+ lmo
->l_addr_offset
,
6658 &l_addr
, ptr_size
) == 0
6659 && read_one_ptr (lm_addr
+ lmo
->l_ld_offset
,
6660 &l_ld
, ptr_size
) == 0
6661 && read_one_ptr (lm_addr
+ lmo
->l_prev_offset
,
6662 &l_prev
, ptr_size
) == 0
6663 && read_one_ptr (lm_addr
+ lmo
->l_next_offset
,
6664 &l_next
, ptr_size
) == 0)
6666 unsigned char libname
[PATH_MAX
];
6668 if (lm_prev
!= l_prev
)
6670 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6671 (long) lm_prev
, (long) l_prev
);
6675 /* Ignore the first entry even if it has valid name as the first entry
6676 corresponds to the main executable. The first entry should not be
6677 skipped if the dynamic loader was loaded late by a static executable
6678 (see solib-svr4.c parameter ignore_first). But in such case the main
6679 executable does not have PT_DYNAMIC present and this function already
6680 exited above due to failed get_r_debug. */
6683 sprintf (p
, " main-lm=\"0x%lx\"", (unsigned long) lm_addr
);
6688 /* Not checking for error because reading may stop before
6689 we've got PATH_MAX worth of characters. */
6691 linux_read_memory (l_name
, libname
, sizeof (libname
) - 1);
6692 libname
[sizeof (libname
) - 1] = '\0';
6693 if (libname
[0] != '\0')
6695 /* 6x the size for xml_escape_text below. */
6696 size_t len
= 6 * strlen ((char *) libname
);
6698 const char *hex_enc_build_id
= NULL
;
6702 /* Terminate `<library-list-svr4'. */
6707 hex_enc_build_id
= get_hex_build_id (l_addr
, l_ld
, &data
);
6709 while (allocated
< (p
- document
+ len
+ 200
6710 + (hex_enc_build_id
!= NULL
6711 ? strlen (hex_enc_build_id
) : 0)))
6713 /* Expand to guarantee sufficient storage. */
6714 uintptr_t document_len
= p
- document
;
6716 document
= xrealloc (document
, 2 * allocated
);
6718 p
= document
+ document_len
;
6721 name
= xml_escape_text ((char *) libname
);
6722 p
+= sprintf (p
, "<library name=\"%s\" lm=\"0x%lx\" "
6723 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"",
6724 name
, (unsigned long) lm_addr
,
6725 (unsigned long) l_addr
, (unsigned long) l_ld
);
6726 if (hex_enc_build_id
!= NULL
6727 && strcmp (hex_enc_build_id
, BUILD_ID_INVALID
) != 0)
6728 p
+= sprintf (p
, " build-id=\"%s\"", hex_enc_build_id
);
6729 p
+= sprintf (p
, "/>");
6740 /* Empty list; terminate `<library-list-svr4'. */
6744 strcpy (p
, "</library-list-svr4>");
6746 document_len
= strlen (document
);
6747 if (offset
< document_len
)
6748 document_len
-= offset
;
6751 if (len
> document_len
)
6754 memcpy (readbuf
, document
+ offset
, len
);
6756 free_mapping_entry_vec (data
.list
);
6761 #ifdef HAVE_LINUX_BTRACE
6763 /* See to_enable_btrace target method. */
6765 static struct btrace_target_info
*
6766 linux_low_enable_btrace (ptid_t ptid
, const struct btrace_config
*conf
)
6768 struct btrace_target_info
*tinfo
;
6770 tinfo
= linux_enable_btrace (ptid
, conf
);
6772 if (tinfo
!= NULL
&& tinfo
->ptr_bits
== 0)
6774 struct thread_info
*thread
= find_thread_ptid (ptid
);
6775 struct regcache
*regcache
= get_thread_regcache (thread
, 0);
6777 tinfo
->ptr_bits
= register_size (regcache
->tdesc
, 0) * 8;
6783 /* See to_disable_btrace target method. */
6786 linux_low_disable_btrace (struct btrace_target_info
*tinfo
)
6788 enum btrace_error err
;
6790 err
= linux_disable_btrace (tinfo
);
6791 return (err
== BTRACE_ERR_NONE
? 0 : -1);
6794 /* Encode an Intel(R) Processor Trace configuration. */
6797 linux_low_encode_pt_config (struct buffer
*buffer
,
6798 const struct btrace_data_pt_config
*config
)
6800 buffer_grow_str (buffer
, "<pt-config>\n");
6802 switch (config
->cpu
.vendor
)
6805 buffer_xml_printf (buffer
, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
6806 "model=\"%u\" stepping=\"%u\"/>\n",
6807 config
->cpu
.family
, config
->cpu
.model
,
6808 config
->cpu
.stepping
);
6815 buffer_grow_str (buffer
, "</pt-config>\n");
6818 /* Encode a raw buffer. */
6821 linux_low_encode_raw (struct buffer
*buffer
, const gdb_byte
*data
,
6827 /* We use hex encoding - see common/rsp-low.h. */
6828 buffer_grow_str (buffer
, "<raw>\n");
6834 elem
[0] = tohex ((*data
>> 4) & 0xf);
6835 elem
[1] = tohex (*data
++ & 0xf);
6837 buffer_grow (buffer
, elem
, 2);
6840 buffer_grow_str (buffer
, "</raw>\n");
6843 /* See to_read_btrace target method. */
6846 linux_low_read_btrace (struct btrace_target_info
*tinfo
, struct buffer
*buffer
,
6849 struct btrace_data btrace
;
6850 struct btrace_block
*block
;
6851 enum btrace_error err
;
6854 btrace_data_init (&btrace
);
6856 err
= linux_read_btrace (&btrace
, tinfo
, type
);
6857 if (err
!= BTRACE_ERR_NONE
)
6859 if (err
== BTRACE_ERR_OVERFLOW
)
6860 buffer_grow_str0 (buffer
, "E.Overflow.");
6862 buffer_grow_str0 (buffer
, "E.Generic Error.");
6867 switch (btrace
.format
)
6869 case BTRACE_FORMAT_NONE
:
6870 buffer_grow_str0 (buffer
, "E.No Trace.");
6873 case BTRACE_FORMAT_BTS
:
6874 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6875 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6878 VEC_iterate (btrace_block_s
, btrace
.variant
.bts
.blocks
, i
, block
);
6880 buffer_xml_printf (buffer
, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
6881 paddress (block
->begin
), paddress (block
->end
));
6883 buffer_grow_str0 (buffer
, "</btrace>\n");
6886 case BTRACE_FORMAT_PT
:
6887 buffer_grow_str (buffer
, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
6888 buffer_grow_str (buffer
, "<btrace version=\"1.0\">\n");
6889 buffer_grow_str (buffer
, "<pt>\n");
6891 linux_low_encode_pt_config (buffer
, &btrace
.variant
.pt
.config
);
6893 linux_low_encode_raw (buffer
, btrace
.variant
.pt
.data
,
6894 btrace
.variant
.pt
.size
);
6896 buffer_grow_str (buffer
, "</pt>\n");
6897 buffer_grow_str0 (buffer
, "</btrace>\n");
6901 buffer_grow_str0 (buffer
, "E.Unsupported Trace Format.");
6905 btrace_data_fini (&btrace
);
6909 btrace_data_fini (&btrace
);
6913 /* See to_btrace_conf target method. */
6916 linux_low_btrace_conf (const struct btrace_target_info
*tinfo
,
6917 struct buffer
*buffer
)
6919 const struct btrace_config
*conf
;
6921 buffer_grow_str (buffer
, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
6922 buffer_grow_str (buffer
, "<btrace-conf version=\"1.0\">\n");
6924 conf
= linux_btrace_conf (tinfo
);
6927 switch (conf
->format
)
6929 case BTRACE_FORMAT_NONE
:
6932 case BTRACE_FORMAT_BTS
:
6933 buffer_xml_printf (buffer
, "<bts");
6934 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->bts
.size
);
6935 buffer_xml_printf (buffer
, " />\n");
6938 case BTRACE_FORMAT_PT
:
6939 buffer_xml_printf (buffer
, "<pt");
6940 buffer_xml_printf (buffer
, " size=\"0x%x\"", conf
->pt
.size
);
6941 buffer_xml_printf (buffer
, "/>\n");
6946 buffer_grow_str0 (buffer
, "</btrace-conf>\n");
6949 #endif /* HAVE_LINUX_BTRACE */
6951 /* See nat/linux-nat.h. */
6954 current_lwp_ptid (void)
6956 return ptid_of (current_thread
);
6959 static struct target_ops linux_target_ops
= {
6960 linux_create_inferior
,
6969 linux_fetch_registers
,
6970 linux_store_registers
,
6971 linux_prepare_to_access_memory
,
6972 linux_done_accessing_memory
,
6975 linux_look_up_symbols
,
6976 linux_request_interrupt
,
6978 linux_supports_z_point_type
,
6981 linux_stopped_by_sw_breakpoint
,
6982 linux_supports_stopped_by_sw_breakpoint
,
6983 linux_stopped_by_hw_breakpoint
,
6984 linux_supports_stopped_by_hw_breakpoint
,
6985 linux_supports_conditional_breakpoints
,
6986 linux_stopped_by_watchpoint
,
6987 linux_stopped_data_address
,
6988 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
6989 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
6990 && defined(PT_TEXT_END_ADDR)
6995 #ifdef USE_THREAD_DB
6996 thread_db_get_tls_address
,
7001 hostio_last_error_from_errno
,
7004 linux_supports_non_stop
,
7006 linux_start_non_stop
,
7007 linux_supports_multi_process
,
7008 linux_supports_fork_events
,
7009 linux_supports_vfork_events
,
7010 linux_handle_new_gdb_connection
,
7011 #ifdef USE_THREAD_DB
7012 thread_db_handle_monitor_command
,
7016 linux_common_core_of_thread
,
7018 linux_process_qsupported
,
7019 linux_supports_tracepoints
,
7022 linux_thread_stopped
,
7026 linux_stabilize_threads
,
7027 linux_install_fast_tracepoint_jump_pad
,
7029 linux_supports_disable_randomization
,
7030 linux_get_min_fast_tracepoint_insn_len
,
7031 linux_qxfer_libraries_svr4
,
7032 linux_supports_agent
,
7033 #ifdef HAVE_LINUX_BTRACE
7034 linux_supports_btrace
,
7035 linux_low_enable_btrace
,
7036 linux_low_disable_btrace
,
7037 linux_low_read_btrace
,
7038 linux_low_btrace_conf
,
7046 linux_supports_range_stepping
,
7047 linux_proc_pid_to_exec_file
,
7048 linux_mntns_open_cloexec
,
7050 linux_mntns_readlink
,
7054 linux_init_signals ()
7056 /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
7057 to find what the cancel signal actually is. */
7058 #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
7059 signal (__SIGRTMIN
+1, SIG_IGN
);
7063 #ifdef HAVE_LINUX_REGSETS
7065 initialize_regsets_info (struct regsets_info
*info
)
7067 for (info
->num_regsets
= 0;
7068 info
->regsets
[info
->num_regsets
].size
>= 0;
7069 info
->num_regsets
++)
7075 initialize_low (void)
7077 struct sigaction sigchld_action
;
7078 memset (&sigchld_action
, 0, sizeof (sigchld_action
));
7079 set_target_ops (&linux_target_ops
);
7080 set_breakpoint_data (the_low_target
.breakpoint
,
7081 the_low_target
.breakpoint_len
);
7082 linux_init_signals ();
7083 linux_ptrace_init_warnings ();
7085 sigchld_action
.sa_handler
= sigchld_handler
;
7086 sigemptyset (&sigchld_action
.sa_mask
);
7087 sigchld_action
.sa_flags
= SA_RESTART
;
7088 sigaction (SIGCHLD
, &sigchld_action
, NULL
);
7090 initialize_low_arch ();
7092 linux_check_ptrace_features ();