1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2016 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"
26 #include "nat/linux-nat.h"
27 #include "nat/linux-waitpid.h"
29 #include "nat/gdb_ptrace.h"
30 #include "nat/linux-ptrace.h"
31 #include "nat/linux-procfs.h"
32 #include "nat/linux-personality.h"
34 #include <sys/ioctl.h>
37 #include <sys/syscall.h>
41 #include <sys/types.h>
46 #include "filestuff.h"
47 #include "tracepoint.h"
50 /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
51 then ELFMAG0 will have been defined. If it didn't get included by
52 gdb_proc_service.h then including it will likely introduce a duplicate
53 definition of elf_fpregset_t. */
56 #include "nat/linux-namespaces.h"
59 #define SPUFS_MAGIC 0x23c9b64e
62 #ifdef HAVE_PERSONALITY
63 # include <sys/personality.h>
64 # if !HAVE_DECL_ADDR_NO_RANDOMIZE
65 # define ADDR_NO_RANDOMIZE 0x0040000
73 /* Some targets did not define these ptrace constants from the start,
74 so gdbserver defines them locally here. In the future, these may
75 be removed after they are added to asm/ptrace.h. */
76 #if !(defined(PT_TEXT_ADDR) \
77 || defined(PT_DATA_ADDR) \
78 || defined(PT_TEXT_END_ADDR))
79 #if defined(__mcoldfire__)
80 /* These are still undefined in 3.10 kernels. */
81 #define PT_TEXT_ADDR 49*4
82 #define PT_DATA_ADDR 50*4
83 #define PT_TEXT_END_ADDR 51*4
84 /* BFIN already defines these since at least 2.6.32 kernels. */
86 #define PT_TEXT_ADDR 220
87 #define PT_TEXT_END_ADDR 224
88 #define PT_DATA_ADDR 228
89 /* These are still undefined in 3.10 kernels. */
90 #elif defined(__TMS320C6X__)
91 #define PT_TEXT_ADDR (0x10000*4)
92 #define PT_DATA_ADDR (0x10004*4)
93 #define PT_TEXT_END_ADDR (0x10008*4)
97 #ifdef HAVE_LINUX_BTRACE
98 # include "nat/linux-btrace.h"
99 # include "btrace-common.h"
102 #ifndef HAVE_ELF32_AUXV_T
103 /* Copied from glibc's elf.h. */
106 uint32_t a_type; /* Entry type */
109 uint32_t a_val; /* Integer value */
110 /* We use to have pointer elements added here. We cannot do that,
111 though, since it does not work when using 32-bit definitions
112 on 64-bit platforms and vice versa. */
117 #ifndef HAVE_ELF64_AUXV_T
118 /* Copied from glibc's elf.h. */
121 uint64_t a_type; /* Entry type */
124 uint64_t a_val; /* Integer value */
125 /* We use to have pointer elements added here. We cannot do that,
126 though, since it does not work when using 32-bit definitions
127 on 64-bit platforms and vice versa. */
132 /* Does the current host support PTRACE_GETREGSET? */
133 int have_ptrace_getregset = -1;
137 /* See nat/linux-nat.h. */
140 ptid_of_lwp (struct lwp_info *lwp)
142 return ptid_of (get_lwp_thread (lwp));
145 /* See nat/linux-nat.h. */
148 lwp_set_arch_private_info (struct lwp_info *lwp,
149 struct arch_lwp_info *info)
151 lwp->arch_private = info;
154 /* See nat/linux-nat.h. */
156 struct arch_lwp_info *
157 lwp_arch_private_info (struct lwp_info *lwp)
159 return lwp->arch_private;
162 /* See nat/linux-nat.h. */
165 lwp_is_stopped (struct lwp_info *lwp)
170 /* See nat/linux-nat.h. */
172 enum target_stop_reason
173 lwp_stop_reason (struct lwp_info *lwp)
175 return lwp->stop_reason;
178 /* A list of all unknown processes which receive stop signals. Some
179 other process will presumably claim each of these as forked
180 children momentarily. */
182 struct simple_pid_list
184 /* The process ID. */
187 /* The status as reported by waitpid. */
191 struct simple_pid_list *next;
193 struct simple_pid_list *stopped_pids;
195 /* Trivial list manipulation functions to keep track of a list of new
196 stopped processes. */
199 add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
201 struct simple_pid_list *new_pid = XNEW (struct simple_pid_list);
204 new_pid->status = status;
205 new_pid->next = *listp;
210 pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp)
212 struct simple_pid_list **p;
214 for (p = listp; *p != NULL; p = &(*p)->next)
215 if ((*p)->pid == pid)
217 struct simple_pid_list *next = (*p)->next;
219 *statusp = (*p)->status;
227 enum stopping_threads_kind
229 /* Not stopping threads presently. */
230 NOT_STOPPING_THREADS,
232 /* Stopping threads. */
235 /* Stopping and suspending threads. */
236 STOPPING_AND_SUSPENDING_THREADS
239 /* This is set while stop_all_lwps is in effect. */
240 enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS;
242 /* FIXME make into a target method? */
243 int using_threads = 1;
245 /* True if we're presently stabilizing threads (moving them out of
247 static int stabilizing_threads;
249 static void linux_resume_one_lwp (struct lwp_info *lwp,
250 int step, int signal, siginfo_t *info);
251 static void linux_resume (struct thread_resume *resume_info, size_t n);
252 static void stop_all_lwps (int suspend, struct lwp_info *except);
253 static void unstop_all_lwps (int unsuspend, struct lwp_info *except);
254 static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid,
255 int *wstat, int options);
256 static int linux_wait_for_event (ptid_t ptid, int *wstat, int options);
257 static struct lwp_info *add_lwp (ptid_t ptid);
258 static void linux_mourn (struct process_info *process);
259 static int linux_stopped_by_watchpoint (void);
260 static void mark_lwp_dead (struct lwp_info *lwp, int wstat);
261 static int lwp_is_marked_dead (struct lwp_info *lwp);
262 static void proceed_all_lwps (void);
263 static int finish_step_over (struct lwp_info *lwp);
264 static int kill_lwp (unsigned long lwpid, int signo);
265 static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info);
266 static void complete_ongoing_step_over (void);
267 static int linux_low_ptrace_options (int attached);
269 /* When the event-loop is doing a step-over, this points at the thread
271 ptid_t step_over_bkpt;
273 /* True if the low target can hardware single-step. */
276 can_hardware_single_step (void)
278 if (the_low_target.supports_hardware_single_step != NULL)
279 return the_low_target.supports_hardware_single_step ();
284 /* True if the low target can software single-step. Such targets
285 implement the GET_NEXT_PCS callback. */
288 can_software_single_step (void)
290 return (the_low_target.get_next_pcs != NULL);
293 /* True if the low target supports memory breakpoints. If so, we'll
294 have a GET_PC implementation. */
297 supports_breakpoints (void)
299 return (the_low_target.get_pc != NULL);
302 /* Returns true if this target can support fast tracepoints. This
303 does not mean that the in-process agent has been loaded in the
307 supports_fast_tracepoints (void)
309 return the_low_target.install_fast_tracepoint_jump_pad != NULL;
312 /* True if LWP is stopped in its stepping range. */
315 lwp_in_step_range (struct lwp_info *lwp)
317 CORE_ADDR pc = lwp->stop_pc;
319 return (pc >= lwp->step_range_start && pc < lwp->step_range_end);
322 struct pending_signals
326 struct pending_signals *prev;
329 /* The read/write ends of the pipe registered as waitable file in the
331 static int linux_event_pipe[2] = { -1, -1 };
333 /* True if we're currently in async mode. */
334 #define target_is_async_p() (linux_event_pipe[0] != -1)
336 static void send_sigstop (struct lwp_info *lwp);
337 static void wait_for_sigstop (void);
339 /* Return non-zero if HEADER is a 64-bit ELF file. */
342 elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine)
344 if (header->e_ident[EI_MAG0] == ELFMAG0
345 && header->e_ident[EI_MAG1] == ELFMAG1
346 && header->e_ident[EI_MAG2] == ELFMAG2
347 && header->e_ident[EI_MAG3] == ELFMAG3)
349 *machine = header->e_machine;
350 return header->e_ident[EI_CLASS] == ELFCLASS64;
357 /* Return non-zero if FILE is a 64-bit ELF file,
358 zero if the file is not a 64-bit ELF file,
359 and -1 if the file is not accessible or doesn't exist. */
362 elf_64_file_p (const char *file, unsigned int *machine)
367 fd = open (file, O_RDONLY);
371 if (read (fd, &header, sizeof (header)) != sizeof (header))
378 return elf_64_header_p (&header, machine);
381 /* Accepts an integer PID; Returns true if the executable PID is
382 running is a 64-bit ELF file.. */
385 linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine)
389 sprintf (file, "/proc/%d/exe", pid);
390 return elf_64_file_p (file, machine);
394 delete_lwp (struct lwp_info *lwp)
396 struct thread_info *thr = get_lwp_thread (lwp);
399 debug_printf ("deleting %ld\n", lwpid_of (thr));
402 free (lwp->arch_private);
406 /* Add a process to the common process list, and set its private
409 static struct process_info *
410 linux_add_process (int pid, int attached)
412 struct process_info *proc;
414 proc = add_process (pid, attached);
415 proc->priv = XCNEW (struct process_info_private);
417 if (the_low_target.new_process != NULL)
418 proc->priv->arch_private = the_low_target.new_process ();
423 static CORE_ADDR get_pc (struct lwp_info *lwp);
425 /* Call the target arch_setup function on the current thread. */
428 linux_arch_setup (void)
430 the_low_target.arch_setup ();
433 /* Call the target arch_setup function on THREAD. */
436 linux_arch_setup_thread (struct thread_info *thread)
438 struct thread_info *saved_thread;
440 saved_thread = current_thread;
441 current_thread = thread;
445 current_thread = saved_thread;
448 /* Handle a GNU/Linux extended wait response. If we see a clone,
449 fork, or vfork event, we need to add the new LWP to our list
450 (and return 0 so as not to report the trap to higher layers).
451 If we see an exec event, we will modify ORIG_EVENT_LWP to point
452 to a new LWP representing the new program. */
455 handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat)
457 struct lwp_info *event_lwp = *orig_event_lwp;
458 int event = linux_ptrace_get_extended_event (wstat);
459 struct thread_info *event_thr = get_lwp_thread (event_lwp);
460 struct lwp_info *new_lwp;
462 gdb_assert (event_lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE);
464 /* All extended events we currently use are mid-syscall. Only
465 PTRACE_EVENT_STOP is delivered more like a signal-stop, but
466 you have to be using PTRACE_SEIZE to get that. */
467 event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY;
469 if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK)
470 || (event == PTRACE_EVENT_CLONE))
473 unsigned long new_pid;
476 /* Get the pid of the new lwp. */
477 ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0,
480 /* If we haven't already seen the new PID stop, wait for it now. */
481 if (!pull_pid_from_list (&stopped_pids, new_pid, &status))
483 /* The new child has a pending SIGSTOP. We can't affect it until it
484 hits the SIGSTOP, but we're already attached. */
486 ret = my_waitpid (new_pid, &status, __WALL);
489 perror_with_name ("waiting for new child");
490 else if (ret != new_pid)
491 warning ("wait returned unexpected PID %d", ret);
492 else if (!WIFSTOPPED (status))
493 warning ("wait returned unexpected status 0x%x", status);
496 if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK)
498 struct process_info *parent_proc;
499 struct process_info *child_proc;
500 struct lwp_info *child_lwp;
501 struct thread_info *child_thr;
502 struct target_desc *tdesc;
504 ptid = ptid_build (new_pid, new_pid, 0);
508 debug_printf ("HEW: Got fork event from LWP %ld, "
510 ptid_get_lwp (ptid_of (event_thr)),
511 ptid_get_pid (ptid));
514 /* Add the new process to the tables and clone the breakpoint
515 lists of the parent. We need to do this even if the new process
516 will be detached, since we will need the process object and the
517 breakpoints to remove any breakpoints from memory when we
518 detach, and the client side will access registers. */
519 child_proc = linux_add_process (new_pid, 0);
520 gdb_assert (child_proc != NULL);
521 child_lwp = add_lwp (ptid);
522 gdb_assert (child_lwp != NULL);
523 child_lwp->stopped = 1;
524 child_lwp->must_set_ptrace_flags = 1;
525 child_lwp->status_pending_p = 0;
526 child_thr = get_lwp_thread (child_lwp);
527 child_thr->last_resume_kind = resume_stop;
528 child_thr->last_status.kind = TARGET_WAITKIND_STOPPED;
530 /* If we're suspending all threads, leave this one suspended
532 if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS)
535 debug_printf ("HEW: leaving child suspended\n");
536 child_lwp->suspended = 1;
539 parent_proc = get_thread_process (event_thr);
540 child_proc->attached = parent_proc->attached;
541 clone_all_breakpoints (&child_proc->breakpoints,
542 &child_proc->raw_breakpoints,
543 parent_proc->breakpoints);
545 tdesc = XNEW (struct target_desc);
546 copy_target_description (tdesc, parent_proc->tdesc);
547 child_proc->tdesc = tdesc;
549 /* Clone arch-specific process data. */
550 if (the_low_target.new_fork != NULL)
551 the_low_target.new_fork (parent_proc, child_proc);
553 /* Save fork info in the parent thread. */
554 if (event == PTRACE_EVENT_FORK)
555 event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED;
556 else if (event == PTRACE_EVENT_VFORK)
557 event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED;
559 event_lwp->waitstatus.value.related_pid = ptid;
561 /* The status_pending field contains bits denoting the
562 extended event, so when the pending event is handled,
563 the handler will look at lwp->waitstatus. */
564 event_lwp->status_pending_p = 1;
565 event_lwp->status_pending = wstat;
567 /* Report the event. */
572 debug_printf ("HEW: Got clone event "
573 "from LWP %ld, new child is LWP %ld\n",
574 lwpid_of (event_thr), new_pid);
576 ptid = ptid_build (pid_of (event_thr), new_pid, 0);
577 new_lwp = add_lwp (ptid);
579 /* Either we're going to immediately resume the new thread
580 or leave it stopped. linux_resume_one_lwp is a nop if it
581 thinks the thread is currently running, so set this first
582 before calling linux_resume_one_lwp. */
583 new_lwp->stopped = 1;
585 /* If we're suspending all threads, leave this one suspended
587 if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS)
588 new_lwp->suspended = 1;
590 /* Normally we will get the pending SIGSTOP. But in some cases
591 we might get another signal delivered to the group first.
592 If we do get another signal, be sure not to lose it. */
593 if (WSTOPSIG (status) != SIGSTOP)
595 new_lwp->stop_expected = 1;
596 new_lwp->status_pending_p = 1;
597 new_lwp->status_pending = status;
599 else if (report_thread_events)
601 new_lwp->waitstatus.kind = TARGET_WAITKIND_THREAD_CREATED;
602 new_lwp->status_pending_p = 1;
603 new_lwp->status_pending = status;
606 /* Don't report the event. */
609 else if (event == PTRACE_EVENT_VFORK_DONE)
611 event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE;
613 /* Report the event. */
616 else if (event == PTRACE_EVENT_EXEC && report_exec_events)
618 struct process_info *proc;
619 VEC (int) *syscalls_to_catch;
625 debug_printf ("HEW: Got exec event from LWP %ld\n",
626 lwpid_of (event_thr));
629 /* Get the event ptid. */
630 event_ptid = ptid_of (event_thr);
631 event_pid = ptid_get_pid (event_ptid);
633 /* Save the syscall list from the execing process. */
634 proc = get_thread_process (event_thr);
635 syscalls_to_catch = proc->syscalls_to_catch;
636 proc->syscalls_to_catch = NULL;
638 /* Delete the execing process and all its threads. */
640 current_thread = NULL;
642 /* Create a new process/lwp/thread. */
643 proc = linux_add_process (event_pid, 0);
644 event_lwp = add_lwp (event_ptid);
645 event_thr = get_lwp_thread (event_lwp);
646 gdb_assert (current_thread == event_thr);
647 linux_arch_setup_thread (event_thr);
649 /* Set the event status. */
650 event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD;
651 event_lwp->waitstatus.value.execd_pathname
652 = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr)));
654 /* Mark the exec status as pending. */
655 event_lwp->stopped = 1;
656 event_lwp->status_pending_p = 1;
657 event_lwp->status_pending = wstat;
658 event_thr->last_resume_kind = resume_continue;
659 event_thr->last_status.kind = TARGET_WAITKIND_IGNORE;
661 /* Update syscall state in the new lwp, effectively mid-syscall too. */
662 event_lwp->syscall_state = TARGET_WAITKIND_SYSCALL_ENTRY;
664 /* Restore the list to catch. Don't rely on the client, which is free
665 to avoid sending a new list when the architecture doesn't change.
666 Also, for ANY_SYSCALL, the architecture doesn't really matter. */
667 proc->syscalls_to_catch = syscalls_to_catch;
669 /* Report the event. */
670 *orig_event_lwp = event_lwp;
674 internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event);
677 /* Return the PC as read from the regcache of LWP, without any
681 get_pc (struct lwp_info *lwp)
683 struct thread_info *saved_thread;
684 struct regcache *regcache;
687 if (the_low_target.get_pc == NULL)
690 saved_thread = current_thread;
691 current_thread = get_lwp_thread (lwp);
693 regcache = get_thread_regcache (current_thread, 1);
694 pc = (*the_low_target.get_pc) (regcache);
697 debug_printf ("pc is 0x%lx\n", (long) pc);
699 current_thread = saved_thread;
703 /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
704 Fill *SYSNO with the syscall nr trapped. Fill *SYSRET with the
708 get_syscall_trapinfo (struct lwp_info *lwp, int *sysno, int *sysret)
710 struct thread_info *saved_thread;
711 struct regcache *regcache;
713 if (the_low_target.get_syscall_trapinfo == NULL)
715 /* If we cannot get the syscall trapinfo, report an unknown
716 system call number and -ENOSYS return value. */
717 *sysno = UNKNOWN_SYSCALL;
722 saved_thread = current_thread;
723 current_thread = get_lwp_thread (lwp);
725 regcache = get_thread_regcache (current_thread, 1);
726 (*the_low_target.get_syscall_trapinfo) (regcache, sysno, sysret);
730 debug_printf ("get_syscall_trapinfo sysno %d sysret %d\n",
734 current_thread = saved_thread;
737 /* This function should only be called if LWP got a SIGTRAP.
738 The SIGTRAP could mean several things.
740 On i386, where decr_pc_after_break is non-zero:
742 If we were single-stepping this process using PTRACE_SINGLESTEP, we
743 will get only the one SIGTRAP. The value of $eip will be the next
744 instruction. If the instruction we stepped over was a breakpoint,
745 we need to decrement the PC.
747 If we continue the process using PTRACE_CONT, we will get a
748 SIGTRAP when we hit a breakpoint. The value of $eip will be
749 the instruction after the breakpoint (i.e. needs to be
750 decremented). If we report the SIGTRAP to GDB, we must also
751 report the undecremented PC. If the breakpoint is removed, we
752 must resume at the decremented PC.
754 On a non-decr_pc_after_break machine with hardware or kernel
757 If we either single-step a breakpoint instruction, or continue and
758 hit a breakpoint instruction, our PC will point at the breakpoint
762 check_stopped_by_breakpoint (struct lwp_info *lwp)
765 CORE_ADDR sw_breakpoint_pc;
766 struct thread_info *saved_thread;
767 #if USE_SIGTRAP_SIGINFO
771 if (the_low_target.get_pc == NULL)
775 sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break;
777 /* breakpoint_at reads from the current thread. */
778 saved_thread = current_thread;
779 current_thread = get_lwp_thread (lwp);
781 #if USE_SIGTRAP_SIGINFO
782 if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread),
783 (PTRACE_TYPE_ARG3) 0, &siginfo) == 0)
785 if (siginfo.si_signo == SIGTRAP)
787 if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code))
791 struct thread_info *thr = get_lwp_thread (lwp);
793 debug_printf ("CSBB: %s stopped by software breakpoint\n",
794 target_pid_to_str (ptid_of (thr)));
797 /* Back up the PC if necessary. */
798 if (pc != sw_breakpoint_pc)
800 struct regcache *regcache
801 = get_thread_regcache (current_thread, 1);
802 (*the_low_target.set_pc) (regcache, sw_breakpoint_pc);
805 lwp->stop_pc = sw_breakpoint_pc;
806 lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
807 current_thread = saved_thread;
810 else if (siginfo.si_code == TRAP_HWBKPT)
814 struct thread_info *thr = get_lwp_thread (lwp);
816 debug_printf ("CSBB: %s stopped by hardware "
817 "breakpoint/watchpoint\n",
818 target_pid_to_str (ptid_of (thr)));
822 lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
823 current_thread = saved_thread;
826 else if (siginfo.si_code == TRAP_TRACE)
830 struct thread_info *thr = get_lwp_thread (lwp);
832 debug_printf ("CSBB: %s stopped by trace\n",
833 target_pid_to_str (ptid_of (thr)));
836 lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP;
841 /* We may have just stepped a breakpoint instruction. E.g., in
842 non-stop mode, GDB first tells the thread A to step a range, and
843 then the user inserts a breakpoint inside the range. In that
844 case we need to report the breakpoint PC. */
845 if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc)
846 && (*the_low_target.breakpoint_at) (sw_breakpoint_pc))
850 struct thread_info *thr = get_lwp_thread (lwp);
852 debug_printf ("CSBB: %s stopped by software breakpoint\n",
853 target_pid_to_str (ptid_of (thr)));
856 /* Back up the PC if necessary. */
857 if (pc != sw_breakpoint_pc)
859 struct regcache *regcache
860 = get_thread_regcache (current_thread, 1);
861 (*the_low_target.set_pc) (regcache, sw_breakpoint_pc);
864 lwp->stop_pc = sw_breakpoint_pc;
865 lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
866 current_thread = saved_thread;
870 if (hardware_breakpoint_inserted_here (pc))
874 struct thread_info *thr = get_lwp_thread (lwp);
876 debug_printf ("CSBB: %s stopped by hardware breakpoint\n",
877 target_pid_to_str (ptid_of (thr)));
881 lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
882 current_thread = saved_thread;
887 current_thread = saved_thread;
891 static struct lwp_info *
892 add_lwp (ptid_t ptid)
894 struct lwp_info *lwp;
896 lwp = XCNEW (struct lwp_info);
898 lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
900 if (the_low_target.new_thread != NULL)
901 the_low_target.new_thread (lwp);
903 lwp->thread = add_thread (ptid, lwp);
908 /* Start an inferior process and returns its pid.
909 ALLARGS is a vector of program-name and args. */
912 linux_create_inferior (char *program, char **allargs)
914 struct lwp_info *new_lwp;
917 struct cleanup *restore_personality
918 = maybe_disable_address_space_randomization (disable_randomization);
920 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
926 perror_with_name ("fork");
931 ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0);
935 /* If gdbserver is connected to gdb via stdio, redirect the inferior's
936 stdout to stderr so that inferior i/o doesn't corrupt the connection.
937 Also, redirect stdin to /dev/null. */
938 if (remote_connection_is_stdio ())
941 open ("/dev/null", O_RDONLY);
943 if (write (2, "stdin/stdout redirected\n",
944 sizeof ("stdin/stdout redirected\n") - 1) < 0)
946 /* Errors ignored. */;
950 execv (program, allargs);
952 execvp (program, allargs);
954 fprintf (stderr, "Cannot exec %s: %s.\n", program,
960 do_cleanups (restore_personality);
962 linux_add_process (pid, 0);
964 ptid = ptid_build (pid, pid, 0);
965 new_lwp = add_lwp (ptid);
966 new_lwp->must_set_ptrace_flags = 1;
971 /* Implement the post_create_inferior target_ops method. */
974 linux_post_create_inferior (void)
976 struct lwp_info *lwp = get_thread_lwp (current_thread);
980 if (lwp->must_set_ptrace_flags)
982 struct process_info *proc = current_process ();
983 int options = linux_low_ptrace_options (proc->attached);
985 linux_enable_event_reporting (lwpid_of (current_thread), options);
986 lwp->must_set_ptrace_flags = 0;
990 /* Attach to an inferior process. Returns 0 on success, ERRNO on
994 linux_attach_lwp (ptid_t ptid)
996 struct lwp_info *new_lwp;
997 int lwpid = ptid_get_lwp (ptid);
999 if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0)
1003 new_lwp = add_lwp (ptid);
1005 /* We need to wait for SIGSTOP before being able to make the next
1006 ptrace call on this LWP. */
1007 new_lwp->must_set_ptrace_flags = 1;
1009 if (linux_proc_pid_is_stopped (lwpid))
1012 debug_printf ("Attached to a stopped process\n");
1014 /* The process is definitely stopped. It is in a job control
1015 stop, unless the kernel predates the TASK_STOPPED /
1016 TASK_TRACED distinction, in which case it might be in a
1017 ptrace stop. Make sure it is in a ptrace stop; from there we
1018 can kill it, signal it, et cetera.
1020 First make sure there is a pending SIGSTOP. Since we are
1021 already attached, the process can not transition from stopped
1022 to running without a PTRACE_CONT; so we know this signal will
1023 go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
1024 probably already in the queue (unless this kernel is old
1025 enough to use TASK_STOPPED for ptrace stops); but since
1026 SIGSTOP is not an RT signal, it can only be queued once. */
1027 kill_lwp (lwpid, SIGSTOP);
1029 /* Finally, resume the stopped process. This will deliver the
1030 SIGSTOP (or a higher priority signal, just like normal
1031 PTRACE_ATTACH), which we'll catch later on. */
1032 ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0);
1035 /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
1036 brings it to a halt.
1038 There are several cases to consider here:
1040 1) gdbserver has already attached to the process and is being notified
1041 of a new thread that is being created.
1042 In this case we should ignore that SIGSTOP and resume the
1043 process. This is handled below by setting stop_expected = 1,
1044 and the fact that add_thread sets last_resume_kind ==
1047 2) This is the first thread (the process thread), and we're attaching
1048 to it via attach_inferior.
1049 In this case we want the process thread to stop.
1050 This is handled by having linux_attach set last_resume_kind ==
1051 resume_stop after we return.
1053 If the pid we are attaching to is also the tgid, we attach to and
1054 stop all the existing threads. Otherwise, we attach to pid and
1055 ignore any other threads in the same group as this pid.
1057 3) GDB is connecting to gdbserver and is requesting an enumeration of all
1059 In this case we want the thread to stop.
1060 FIXME: This case is currently not properly handled.
1061 We should wait for the SIGSTOP but don't. Things work apparently
1062 because enough time passes between when we ptrace (ATTACH) and when
1063 gdb makes the next ptrace call on the thread.
1065 On the other hand, if we are currently trying to stop all threads, we
1066 should treat the new thread as if we had sent it a SIGSTOP. This works
1067 because we are guaranteed that the add_lwp call above added us to the
1068 end of the list, and so the new thread has not yet reached
1069 wait_for_sigstop (but will). */
1070 new_lwp->stop_expected = 1;
1075 /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not
1076 already attached. Returns true if a new LWP is found, false
1080 attach_proc_task_lwp_callback (ptid_t ptid)
1082 /* Is this a new thread? */
1083 if (find_thread_ptid (ptid) == NULL)
1085 int lwpid = ptid_get_lwp (ptid);
1089 debug_printf ("Found new lwp %d\n", lwpid);
1091 err = linux_attach_lwp (ptid);
1093 /* Be quiet if we simply raced with the thread exiting. EPERM
1094 is returned if the thread's task still exists, and is marked
1095 as exited or zombie, as well as other conditions, so in that
1096 case, confirm the status in /proc/PID/status. */
1098 || (err == EPERM && linux_proc_pid_is_gone (lwpid)))
1102 debug_printf ("Cannot attach to lwp %d: "
1103 "thread is gone (%d: %s)\n",
1104 lwpid, err, strerror (err));
1109 warning (_("Cannot attach to lwp %d: %s"),
1111 linux_ptrace_attach_fail_reason_string (ptid, err));
1119 static void async_file_mark (void);
1121 /* Attach to PID. If PID is the tgid, attach to it and all
1125 linux_attach (unsigned long pid)
1127 struct process_info *proc;
1128 struct thread_info *initial_thread;
1129 ptid_t ptid = ptid_build (pid, pid, 0);
1132 /* Attach to PID. We will check for other threads
1134 err = linux_attach_lwp (ptid);
1136 error ("Cannot attach to process %ld: %s",
1137 pid, linux_ptrace_attach_fail_reason_string (ptid, err));
1139 proc = linux_add_process (pid, 1);
1141 /* Don't ignore the initial SIGSTOP if we just attached to this
1142 process. It will be collected by wait shortly. */
1143 initial_thread = find_thread_ptid (ptid_build (pid, pid, 0));
1144 initial_thread->last_resume_kind = resume_stop;
1146 /* We must attach to every LWP. If /proc is mounted, use that to
1147 find them now. On the one hand, the inferior may be using raw
1148 clone instead of using pthreads. On the other hand, even if it
1149 is using pthreads, GDB may not be connected yet (thread_db needs
1150 to do symbol lookups, through qSymbol). Also, thread_db walks
1151 structures in the inferior's address space to find the list of
1152 threads/LWPs, and those structures may well be corrupted. Note
1153 that once thread_db is loaded, we'll still use it to list threads
1154 and associate pthread info with each LWP. */
1155 linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback);
1157 /* GDB will shortly read the xml target description for this
1158 process, to figure out the process' architecture. But the target
1159 description is only filled in when the first process/thread in
1160 the thread group reports its initial PTRACE_ATTACH SIGSTOP. Do
1161 that now, otherwise, if GDB is fast enough, it could read the
1162 target description _before_ that initial stop. */
1165 struct lwp_info *lwp;
1167 ptid_t pid_ptid = pid_to_ptid (pid);
1169 lwpid = linux_wait_for_event_filtered (pid_ptid, pid_ptid,
1171 gdb_assert (lwpid > 0);
1173 lwp = find_lwp_pid (pid_to_ptid (lwpid));
1175 if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGSTOP)
1177 lwp->status_pending_p = 1;
1178 lwp->status_pending = wstat;
1181 initial_thread->last_resume_kind = resume_continue;
1185 gdb_assert (proc->tdesc != NULL);
1198 second_thread_of_pid_p (struct inferior_list_entry *entry, void *args)
1200 struct counter *counter = (struct counter *) args;
1202 if (ptid_get_pid (entry->id) == counter->pid)
1204 if (++counter->count > 1)
1212 last_thread_of_process_p (int pid)
1214 struct counter counter = { pid , 0 };
1216 return (find_inferior (&all_threads,
1217 second_thread_of_pid_p, &counter) == NULL);
1223 linux_kill_one_lwp (struct lwp_info *lwp)
1225 struct thread_info *thr = get_lwp_thread (lwp);
1226 int pid = lwpid_of (thr);
1228 /* PTRACE_KILL is unreliable. After stepping into a signal handler,
1229 there is no signal context, and ptrace(PTRACE_KILL) (or
1230 ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
1231 ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
1232 alternative is to kill with SIGKILL. We only need one SIGKILL
1233 per process, not one for each thread. But since we still support
1234 support debugging programs using raw clone without CLONE_THREAD,
1235 we send one for each thread. For years, we used PTRACE_KILL
1236 only, so we're being a bit paranoid about some old kernels where
1237 PTRACE_KILL might work better (dubious if there are any such, but
1238 that's why it's paranoia), so we try SIGKILL first, PTRACE_KILL
1239 second, and so we're fine everywhere. */
1242 kill_lwp (pid, SIGKILL);
1245 int save_errno = errno;
1247 debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n",
1248 target_pid_to_str (ptid_of (thr)),
1249 save_errno ? strerror (save_errno) : "OK");
1253 ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0);
1256 int save_errno = errno;
1258 debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
1259 target_pid_to_str (ptid_of (thr)),
1260 save_errno ? strerror (save_errno) : "OK");
1264 /* Kill LWP and wait for it to die. */
1267 kill_wait_lwp (struct lwp_info *lwp)
1269 struct thread_info *thr = get_lwp_thread (lwp);
1270 int pid = ptid_get_pid (ptid_of (thr));
1271 int lwpid = ptid_get_lwp (ptid_of (thr));
1276 debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid);
1280 linux_kill_one_lwp (lwp);
1282 /* Make sure it died. Notes:
1284 - The loop is most likely unnecessary.
1286 - We don't use linux_wait_for_event as that could delete lwps
1287 while we're iterating over them. We're not interested in
1288 any pending status at this point, only in making sure all
1289 wait status on the kernel side are collected until the
1292 - We don't use __WALL here as the __WALL emulation relies on
1293 SIGCHLD, and killing a stopped process doesn't generate
1294 one, nor an exit status.
1296 res = my_waitpid (lwpid, &wstat, 0);
1297 if (res == -1 && errno == ECHILD)
1298 res = my_waitpid (lwpid, &wstat, __WCLONE);
1299 } while (res > 0 && WIFSTOPPED (wstat));
1301 /* Even if it was stopped, the child may have already disappeared.
1302 E.g., if it was killed by SIGKILL. */
1303 if (res < 0 && errno != ECHILD)
1304 perror_with_name ("kill_wait_lwp");
1307 /* Callback for `find_inferior'. Kills an lwp of a given process,
1308 except the leader. */
1311 kill_one_lwp_callback (struct inferior_list_entry *entry, void *args)
1313 struct thread_info *thread = (struct thread_info *) entry;
1314 struct lwp_info *lwp = get_thread_lwp (thread);
1315 int pid = * (int *) args;
1317 if (ptid_get_pid (entry->id) != pid)
1320 /* We avoid killing the first thread here, because of a Linux kernel (at
1321 least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
1322 the children get a chance to be reaped, it will remain a zombie
1325 if (lwpid_of (thread) == pid)
1328 debug_printf ("lkop: is last of process %s\n",
1329 target_pid_to_str (entry->id));
1333 kill_wait_lwp (lwp);
1338 linux_kill (int pid)
1340 struct process_info *process;
1341 struct lwp_info *lwp;
1343 process = find_process_pid (pid);
1344 if (process == NULL)
1347 /* If we're killing a running inferior, make sure it is stopped
1348 first, as PTRACE_KILL will not work otherwise. */
1349 stop_all_lwps (0, NULL);
1351 find_inferior (&all_threads, kill_one_lwp_callback , &pid);
1353 /* See the comment in linux_kill_one_lwp. We did not kill the first
1354 thread in the list, so do so now. */
1355 lwp = find_lwp_pid (pid_to_ptid (pid));
1360 debug_printf ("lk_1: cannot find lwp for pid: %d\n",
1364 kill_wait_lwp (lwp);
1366 the_target->mourn (process);
1368 /* Since we presently can only stop all lwps of all processes, we
1369 need to unstop lwps of other processes. */
1370 unstop_all_lwps (0, NULL);
1374 /* Get pending signal of THREAD, for detaching purposes. This is the
1375 signal the thread last stopped for, which we need to deliver to the
1376 thread when detaching, otherwise, it'd be suppressed/lost. */
1379 get_detach_signal (struct thread_info *thread)
1381 enum gdb_signal signo = GDB_SIGNAL_0;
1383 struct lwp_info *lp = get_thread_lwp (thread);
1385 if (lp->status_pending_p)
1386 status = lp->status_pending;
1389 /* If the thread had been suspended by gdbserver, and it stopped
1390 cleanly, then it'll have stopped with SIGSTOP. But we don't
1391 want to deliver that SIGSTOP. */
1392 if (thread->last_status.kind != TARGET_WAITKIND_STOPPED
1393 || thread->last_status.value.sig == GDB_SIGNAL_0)
1396 /* Otherwise, we may need to deliver the signal we
1398 status = lp->last_status;
1401 if (!WIFSTOPPED (status))
1404 debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n",
1405 target_pid_to_str (ptid_of (thread)));
1409 /* Extended wait statuses aren't real SIGTRAPs. */
1410 if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status))
1413 debug_printf ("GPS: lwp %s had stopped with extended "
1414 "status: no pending signal\n",
1415 target_pid_to_str (ptid_of (thread)));
1419 signo = gdb_signal_from_host (WSTOPSIG (status));
1421 if (program_signals_p && !program_signals[signo])
1424 debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n",
1425 target_pid_to_str (ptid_of (thread)),
1426 gdb_signal_to_string (signo));
1429 else if (!program_signals_p
1430 /* If we have no way to know which signals GDB does not
1431 want to have passed to the program, assume
1432 SIGTRAP/SIGINT, which is GDB's default. */
1433 && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT))
1436 debug_printf ("GPS: lwp %s had signal %s, "
1437 "but we don't know if we should pass it. "
1438 "Default to not.\n",
1439 target_pid_to_str (ptid_of (thread)),
1440 gdb_signal_to_string (signo));
1446 debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n",
1447 target_pid_to_str (ptid_of (thread)),
1448 gdb_signal_to_string (signo));
1450 return WSTOPSIG (status);
1455 linux_detach_one_lwp (struct inferior_list_entry *entry, void *args)
1457 struct thread_info *thread = (struct thread_info *) entry;
1458 struct lwp_info *lwp = get_thread_lwp (thread);
1459 int pid = * (int *) args;
1462 if (ptid_get_pid (entry->id) != pid)
1465 /* If there is a pending SIGSTOP, get rid of it. */
1466 if (lwp->stop_expected)
1469 debug_printf ("Sending SIGCONT to %s\n",
1470 target_pid_to_str (ptid_of (thread)));
1472 kill_lwp (lwpid_of (thread), SIGCONT);
1473 lwp->stop_expected = 0;
1476 /* Flush any pending changes to the process's registers. */
1477 regcache_invalidate_thread (thread);
1479 /* Pass on any pending signal for this thread. */
1480 sig = get_detach_signal (thread);
1482 /* Finally, let it resume. */
1483 if (the_low_target.prepare_to_resume != NULL)
1484 the_low_target.prepare_to_resume (lwp);
1485 if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0,
1486 (PTRACE_TYPE_ARG4) (long) sig) < 0)
1487 error (_("Can't detach %s: %s"),
1488 target_pid_to_str (ptid_of (thread)),
1496 linux_detach (int pid)
1498 struct process_info *process;
1500 process = find_process_pid (pid);
1501 if (process == NULL)
1504 /* As there's a step over already in progress, let it finish first,
1505 otherwise nesting a stabilize_threads operation on top gets real
1507 complete_ongoing_step_over ();
1509 /* Stop all threads before detaching. First, ptrace requires that
1510 the thread is stopped to sucessfully detach. Second, thread_db
1511 may need to uninstall thread event breakpoints from memory, which
1512 only works with a stopped process anyway. */
1513 stop_all_lwps (0, NULL);
1515 #ifdef USE_THREAD_DB
1516 thread_db_detach (process);
1519 /* Stabilize threads (move out of jump pads). */
1520 stabilize_threads ();
1522 find_inferior (&all_threads, linux_detach_one_lwp, &pid);
1524 the_target->mourn (process);
1526 /* Since we presently can only stop all lwps of all processes, we
1527 need to unstop lwps of other processes. */
1528 unstop_all_lwps (0, NULL);
1532 /* Remove all LWPs that belong to process PROC from the lwp list. */
1535 delete_lwp_callback (struct inferior_list_entry *entry, void *proc)
1537 struct thread_info *thread = (struct thread_info *) entry;
1538 struct lwp_info *lwp = get_thread_lwp (thread);
1539 struct process_info *process = (struct process_info *) proc;
1541 if (pid_of (thread) == pid_of (process))
1548 linux_mourn (struct process_info *process)
1550 struct process_info_private *priv;
1552 #ifdef USE_THREAD_DB
1553 thread_db_mourn (process);
1556 find_inferior (&all_threads, delete_lwp_callback, process);
1558 /* Freeing all private data. */
1559 priv = process->priv;
1560 free (priv->arch_private);
1562 process->priv = NULL;
1564 remove_process (process);
1568 linux_join (int pid)
1573 ret = my_waitpid (pid, &status, 0);
1574 if (WIFEXITED (status) || WIFSIGNALED (status))
1576 } while (ret != -1 || errno != ECHILD);
1579 /* Return nonzero if the given thread is still alive. */
1581 linux_thread_alive (ptid_t ptid)
1583 struct lwp_info *lwp = find_lwp_pid (ptid);
1585 /* We assume we always know if a thread exits. If a whole process
1586 exited but we still haven't been able to report it to GDB, we'll
1587 hold on to the last lwp of the dead process. */
1589 return !lwp_is_marked_dead (lwp);
1594 /* Return 1 if this lwp still has an interesting status pending. If
1595 not (e.g., it had stopped for a breakpoint that is gone), return
1599 thread_still_has_status_pending_p (struct thread_info *thread)
1601 struct lwp_info *lp = get_thread_lwp (thread);
1603 if (!lp->status_pending_p)
1606 if (thread->last_resume_kind != resume_stop
1607 && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT
1608 || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT))
1610 struct thread_info *saved_thread;
1614 gdb_assert (lp->last_status != 0);
1618 saved_thread = current_thread;
1619 current_thread = thread;
1621 if (pc != lp->stop_pc)
1624 debug_printf ("PC of %ld changed\n",
1629 #if !USE_SIGTRAP_SIGINFO
1630 else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT
1631 && !(*the_low_target.breakpoint_at) (pc))
1634 debug_printf ("previous SW breakpoint of %ld gone\n",
1638 else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT
1639 && !hardware_breakpoint_inserted_here (pc))
1642 debug_printf ("previous HW breakpoint of %ld gone\n",
1648 current_thread = saved_thread;
1653 debug_printf ("discarding pending breakpoint status\n");
1654 lp->status_pending_p = 0;
1662 /* Returns true if LWP is resumed from the client's perspective. */
1665 lwp_resumed (struct lwp_info *lwp)
1667 struct thread_info *thread = get_lwp_thread (lwp);
1669 if (thread->last_resume_kind != resume_stop)
1672 /* Did gdb send us a `vCont;t', but we haven't reported the
1673 corresponding stop to gdb yet? If so, the thread is still
1674 resumed/running from gdb's perspective. */
1675 if (thread->last_resume_kind == resume_stop
1676 && thread->last_status.kind == TARGET_WAITKIND_IGNORE)
1682 /* Return 1 if this lwp has an interesting status pending. */
1684 status_pending_p_callback (struct inferior_list_entry *entry, void *arg)
1686 struct thread_info *thread = (struct thread_info *) entry;
1687 struct lwp_info *lp = get_thread_lwp (thread);
1688 ptid_t ptid = * (ptid_t *) arg;
1690 /* Check if we're only interested in events from a specific process
1691 or a specific LWP. */
1692 if (!ptid_match (ptid_of (thread), ptid))
1695 if (!lwp_resumed (lp))
1698 if (lp->status_pending_p
1699 && !thread_still_has_status_pending_p (thread))
1701 linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL);
1705 return lp->status_pending_p;
1709 same_lwp (struct inferior_list_entry *entry, void *data)
1711 ptid_t ptid = *(ptid_t *) data;
1714 if (ptid_get_lwp (ptid) != 0)
1715 lwp = ptid_get_lwp (ptid);
1717 lwp = ptid_get_pid (ptid);
1719 if (ptid_get_lwp (entry->id) == lwp)
1726 find_lwp_pid (ptid_t ptid)
1728 struct inferior_list_entry *thread
1729 = find_inferior (&all_threads, same_lwp, &ptid);
1734 return get_thread_lwp ((struct thread_info *) thread);
1737 /* Return the number of known LWPs in the tgid given by PID. */
1742 struct inferior_list_entry *inf, *tmp;
1745 ALL_INFERIORS (&all_threads, inf, tmp)
1747 if (ptid_get_pid (inf->id) == pid)
1754 /* The arguments passed to iterate_over_lwps. */
1756 struct iterate_over_lwps_args
1758 /* The FILTER argument passed to iterate_over_lwps. */
1761 /* The CALLBACK argument passed to iterate_over_lwps. */
1762 iterate_over_lwps_ftype *callback;
1764 /* The DATA argument passed to iterate_over_lwps. */
1768 /* Callback for find_inferior used by iterate_over_lwps to filter
1769 calls to the callback supplied to that function. Returning a
1770 nonzero value causes find_inferiors to stop iterating and return
1771 the current inferior_list_entry. Returning zero indicates that
1772 find_inferiors should continue iterating. */
1775 iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p)
1777 struct iterate_over_lwps_args *args
1778 = (struct iterate_over_lwps_args *) args_p;
1780 if (ptid_match (entry->id, args->filter))
1782 struct thread_info *thr = (struct thread_info *) entry;
1783 struct lwp_info *lwp = get_thread_lwp (thr);
1785 return (*args->callback) (lwp, args->data);
1791 /* See nat/linux-nat.h. */
1794 iterate_over_lwps (ptid_t filter,
1795 iterate_over_lwps_ftype callback,
1798 struct iterate_over_lwps_args args = {filter, callback, data};
1799 struct inferior_list_entry *entry;
1801 entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args);
1805 return get_thread_lwp ((struct thread_info *) entry);
1808 /* Detect zombie thread group leaders, and "exit" them. We can't reap
1809 their exits until all other threads in the group have exited. */
1812 check_zombie_leaders (void)
1814 struct process_info *proc, *tmp;
1816 ALL_PROCESSES (proc, tmp)
1818 pid_t leader_pid = pid_of (proc);
1819 struct lwp_info *leader_lp;
1821 leader_lp = find_lwp_pid (pid_to_ptid (leader_pid));
1824 debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, "
1825 "num_lwps=%d, zombie=%d\n",
1826 leader_pid, leader_lp!= NULL, num_lwps (leader_pid),
1827 linux_proc_pid_is_zombie (leader_pid));
1829 if (leader_lp != NULL && !leader_lp->stopped
1830 /* Check if there are other threads in the group, as we may
1831 have raced with the inferior simply exiting. */
1832 && !last_thread_of_process_p (leader_pid)
1833 && linux_proc_pid_is_zombie (leader_pid))
1835 /* A leader zombie can mean one of two things:
1837 - It exited, and there's an exit status pending
1838 available, or only the leader exited (not the whole
1839 program). In the latter case, we can't waitpid the
1840 leader's exit status until all other threads are gone.
1842 - There are 3 or more threads in the group, and a thread
1843 other than the leader exec'd. On an exec, the Linux
1844 kernel destroys all other threads (except the execing
1845 one) in the thread group, and resets the execing thread's
1846 tid to the tgid. No exit notification is sent for the
1847 execing thread -- from the ptracer's perspective, it
1848 appears as though the execing thread just vanishes.
1849 Until we reap all other threads except the leader and the
1850 execing thread, the leader will be zombie, and the
1851 execing thread will be in `D (disc sleep)'. As soon as
1852 all other threads are reaped, the execing thread changes
1853 it's tid to the tgid, and the previous (zombie) leader
1854 vanishes, giving place to the "new" leader. We could try
1855 distinguishing the exit and exec cases, by waiting once
1856 more, and seeing if something comes out, but it doesn't
1857 sound useful. The previous leader _does_ go away, and
1858 we'll re-add the new one once we see the exec event
1859 (which is just the same as what would happen if the
1860 previous leader did exit voluntarily before some other
1865 "CZL: Thread group leader %d zombie "
1866 "(it exited, or another thread execd).\n",
1869 delete_lwp (leader_lp);
1874 /* Callback for `find_inferior'. Returns the first LWP that is not
1875 stopped. ARG is a PTID filter. */
1878 not_stopped_callback (struct inferior_list_entry *entry, void *arg)
1880 struct thread_info *thr = (struct thread_info *) entry;
1881 struct lwp_info *lwp;
1882 ptid_t filter = *(ptid_t *) arg;
1884 if (!ptid_match (ptid_of (thr), filter))
1887 lwp = get_thread_lwp (thr);
1894 /* Increment LWP's suspend count. */
1897 lwp_suspended_inc (struct lwp_info *lwp)
1901 if (debug_threads && lwp->suspended > 4)
1903 struct thread_info *thread = get_lwp_thread (lwp);
1905 debug_printf ("LWP %ld has a suspiciously high suspend count,"
1906 " suspended=%d\n", lwpid_of (thread), lwp->suspended);
1910 /* Decrement LWP's suspend count. */
1913 lwp_suspended_decr (struct lwp_info *lwp)
1917 if (lwp->suspended < 0)
1919 struct thread_info *thread = get_lwp_thread (lwp);
1921 internal_error (__FILE__, __LINE__,
1922 "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread),
1927 /* This function should only be called if the LWP got a SIGTRAP.
1929 Handle any tracepoint steps or hits. Return true if a tracepoint
1930 event was handled, 0 otherwise. */
1933 handle_tracepoints (struct lwp_info *lwp)
1935 struct thread_info *tinfo = get_lwp_thread (lwp);
1936 int tpoint_related_event = 0;
1938 gdb_assert (lwp->suspended == 0);
1940 /* If this tracepoint hit causes a tracing stop, we'll immediately
1941 uninsert tracepoints. To do this, we temporarily pause all
1942 threads, unpatch away, and then unpause threads. We need to make
1943 sure the unpausing doesn't resume LWP too. */
1944 lwp_suspended_inc (lwp);
1946 /* And we need to be sure that any all-threads-stopping doesn't try
1947 to move threads out of the jump pads, as it could deadlock the
1948 inferior (LWP could be in the jump pad, maybe even holding the
1951 /* Do any necessary step collect actions. */
1952 tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc);
1954 tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc);
1956 /* See if we just hit a tracepoint and do its main collect
1958 tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc);
1960 lwp_suspended_decr (lwp);
1962 gdb_assert (lwp->suspended == 0);
1963 gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint);
1965 if (tpoint_related_event)
1968 debug_printf ("got a tracepoint event\n");
1975 /* Convenience wrapper. Returns true if LWP is presently collecting a
1979 linux_fast_tracepoint_collecting (struct lwp_info *lwp,
1980 struct fast_tpoint_collect_status *status)
1982 CORE_ADDR thread_area;
1983 struct thread_info *thread = get_lwp_thread (lwp);
1985 if (the_low_target.get_thread_area == NULL)
1988 /* Get the thread area address. This is used to recognize which
1989 thread is which when tracing with the in-process agent library.
1990 We don't read anything from the address, and treat it as opaque;
1991 it's the address itself that we assume is unique per-thread. */
1992 if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1)
1995 return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status);
1998 /* The reason we resume in the caller, is because we want to be able
1999 to pass lwp->status_pending as WSTAT, and we need to clear
2000 status_pending_p before resuming, otherwise, linux_resume_one_lwp
2001 refuses to resume. */
2004 maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat)
2006 struct thread_info *saved_thread;
2008 saved_thread = current_thread;
2009 current_thread = get_lwp_thread (lwp);
2012 || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP))
2013 && supports_fast_tracepoints ()
2014 && agent_loaded_p ())
2016 struct fast_tpoint_collect_status status;
2020 debug_printf ("Checking whether LWP %ld needs to move out of the "
2022 lwpid_of (current_thread));
2024 r = linux_fast_tracepoint_collecting (lwp, &status);
2027 || (WSTOPSIG (*wstat) != SIGILL
2028 && WSTOPSIG (*wstat) != SIGFPE
2029 && WSTOPSIG (*wstat) != SIGSEGV
2030 && WSTOPSIG (*wstat) != SIGBUS))
2032 lwp->collecting_fast_tracepoint = r;
2036 if (r == 1 && lwp->exit_jump_pad_bkpt == NULL)
2038 /* Haven't executed the original instruction yet.
2039 Set breakpoint there, and wait till it's hit,
2040 then single-step until exiting the jump pad. */
2041 lwp->exit_jump_pad_bkpt
2042 = set_breakpoint_at (status.adjusted_insn_addr, NULL);
2046 debug_printf ("Checking whether LWP %ld needs to move out of "
2047 "the jump pad...it does\n",
2048 lwpid_of (current_thread));
2049 current_thread = saved_thread;
2056 /* If we get a synchronous signal while collecting, *and*
2057 while executing the (relocated) original instruction,
2058 reset the PC to point at the tpoint address, before
2059 reporting to GDB. Otherwise, it's an IPA lib bug: just
2060 report the signal to GDB, and pray for the best. */
2062 lwp->collecting_fast_tracepoint = 0;
2065 && (status.adjusted_insn_addr <= lwp->stop_pc
2066 && lwp->stop_pc < status.adjusted_insn_addr_end))
2069 struct regcache *regcache;
2071 /* The si_addr on a few signals references the address
2072 of the faulting instruction. Adjust that as
2074 if ((WSTOPSIG (*wstat) == SIGILL
2075 || WSTOPSIG (*wstat) == SIGFPE
2076 || WSTOPSIG (*wstat) == SIGBUS
2077 || WSTOPSIG (*wstat) == SIGSEGV)
2078 && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread),
2079 (PTRACE_TYPE_ARG3) 0, &info) == 0
2080 /* Final check just to make sure we don't clobber
2081 the siginfo of non-kernel-sent signals. */
2082 && (uintptr_t) info.si_addr == lwp->stop_pc)
2084 info.si_addr = (void *) (uintptr_t) status.tpoint_addr;
2085 ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread),
2086 (PTRACE_TYPE_ARG3) 0, &info);
2089 regcache = get_thread_regcache (current_thread, 1);
2090 (*the_low_target.set_pc) (regcache, status.tpoint_addr);
2091 lwp->stop_pc = status.tpoint_addr;
2093 /* Cancel any fast tracepoint lock this thread was
2095 force_unlock_trace_buffer ();
2098 if (lwp->exit_jump_pad_bkpt != NULL)
2101 debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. "
2102 "stopping all threads momentarily.\n");
2104 stop_all_lwps (1, lwp);
2106 delete_breakpoint (lwp->exit_jump_pad_bkpt);
2107 lwp->exit_jump_pad_bkpt = NULL;
2109 unstop_all_lwps (1, lwp);
2111 gdb_assert (lwp->suspended >= 0);
2117 debug_printf ("Checking whether LWP %ld needs to move out of the "
2119 lwpid_of (current_thread));
2121 current_thread = saved_thread;
2125 /* Enqueue one signal in the "signals to report later when out of the
2129 enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat)
2131 struct pending_signals *p_sig;
2132 struct thread_info *thread = get_lwp_thread (lwp);
2135 debug_printf ("Deferring signal %d for LWP %ld.\n",
2136 WSTOPSIG (*wstat), lwpid_of (thread));
2140 struct pending_signals *sig;
2142 for (sig = lwp->pending_signals_to_report;
2145 debug_printf (" Already queued %d\n",
2148 debug_printf (" (no more currently queued signals)\n");
2151 /* Don't enqueue non-RT signals if they are already in the deferred
2152 queue. (SIGSTOP being the easiest signal to see ending up here
2154 if (WSTOPSIG (*wstat) < __SIGRTMIN)
2156 struct pending_signals *sig;
2158 for (sig = lwp->pending_signals_to_report;
2162 if (sig->signal == WSTOPSIG (*wstat))
2165 debug_printf ("Not requeuing already queued non-RT signal %d"
2174 p_sig = XCNEW (struct pending_signals);
2175 p_sig->prev = lwp->pending_signals_to_report;
2176 p_sig->signal = WSTOPSIG (*wstat);
2178 ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0,
2181 lwp->pending_signals_to_report = p_sig;
2184 /* Dequeue one signal from the "signals to report later when out of
2185 the jump pad" list. */
2188 dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat)
2190 struct thread_info *thread = get_lwp_thread (lwp);
2192 if (lwp->pending_signals_to_report != NULL)
2194 struct pending_signals **p_sig;
2196 p_sig = &lwp->pending_signals_to_report;
2197 while ((*p_sig)->prev != NULL)
2198 p_sig = &(*p_sig)->prev;
2200 *wstat = W_STOPCODE ((*p_sig)->signal);
2201 if ((*p_sig)->info.si_signo != 0)
2202 ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0,
2208 debug_printf ("Reporting deferred signal %d for LWP %ld.\n",
2209 WSTOPSIG (*wstat), lwpid_of (thread));
2213 struct pending_signals *sig;
2215 for (sig = lwp->pending_signals_to_report;
2218 debug_printf (" Still queued %d\n",
2221 debug_printf (" (no more queued signals)\n");
2230 /* Fetch the possibly triggered data watchpoint info and store it in
2233 On some archs, like x86, that use debug registers to set
2234 watchpoints, it's possible that the way to know which watched
2235 address trapped, is to check the register that is used to select
2236 which address to watch. Problem is, between setting the watchpoint
2237 and reading back which data address trapped, the user may change
2238 the set of watchpoints, and, as a consequence, GDB changes the
2239 debug registers in the inferior. To avoid reading back a stale
2240 stopped-data-address when that happens, we cache in LP the fact
2241 that a watchpoint trapped, and the corresponding data address, as
2242 soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
2243 registers meanwhile, we have the cached data we can rely on. */
2246 check_stopped_by_watchpoint (struct lwp_info *child)
2248 if (the_low_target.stopped_by_watchpoint != NULL)
2250 struct thread_info *saved_thread;
2252 saved_thread = current_thread;
2253 current_thread = get_lwp_thread (child);
2255 if (the_low_target.stopped_by_watchpoint ())
2257 child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT;
2259 if (the_low_target.stopped_data_address != NULL)
2260 child->stopped_data_address
2261 = the_low_target.stopped_data_address ();
2263 child->stopped_data_address = 0;
2266 current_thread = saved_thread;
2269 return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT;
2272 /* Return the ptrace options that we want to try to enable. */
2275 linux_low_ptrace_options (int attached)
2280 options |= PTRACE_O_EXITKILL;
2282 if (report_fork_events)
2283 options |= PTRACE_O_TRACEFORK;
2285 if (report_vfork_events)
2286 options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE);
2288 if (report_exec_events)
2289 options |= PTRACE_O_TRACEEXEC;
2291 options |= PTRACE_O_TRACESYSGOOD;
2296 /* Do low-level handling of the event, and check if we should go on
2297 and pass it to caller code. Return the affected lwp if we are, or
2300 static struct lwp_info *
2301 linux_low_filter_event (int lwpid, int wstat)
2303 struct lwp_info *child;
2304 struct thread_info *thread;
2305 int have_stop_pc = 0;
2307 child = find_lwp_pid (pid_to_ptid (lwpid));
2309 /* Check for stop events reported by a process we didn't already
2310 know about - anything not already in our LWP list.
2312 If we're expecting to receive stopped processes after
2313 fork, vfork, and clone events, then we'll just add the
2314 new one to our list and go back to waiting for the event
2315 to be reported - the stopped process might be returned
2316 from waitpid before or after the event is.
2318 But note the case of a non-leader thread exec'ing after the
2319 leader having exited, and gone from our lists (because
2320 check_zombie_leaders deleted it). The non-leader thread
2321 changes its tid to the tgid. */
2323 if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP
2324 && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC)
2328 /* A multi-thread exec after we had seen the leader exiting. */
2331 debug_printf ("LLW: Re-adding thread group leader LWP %d"
2332 "after exec.\n", lwpid);
2335 child_ptid = ptid_build (lwpid, lwpid, 0);
2336 child = add_lwp (child_ptid);
2338 current_thread = child->thread;
2341 /* If we didn't find a process, one of two things presumably happened:
2342 - A process we started and then detached from has exited. Ignore it.
2343 - A process we are controlling has forked and the new child's stop
2344 was reported to us by the kernel. Save its PID. */
2345 if (child == NULL && WIFSTOPPED (wstat))
2347 add_to_pid_list (&stopped_pids, lwpid, wstat);
2350 else if (child == NULL)
2353 thread = get_lwp_thread (child);
2357 child->last_status = wstat;
2359 /* Check if the thread has exited. */
2360 if ((WIFEXITED (wstat) || WIFSIGNALED (wstat)))
2363 debug_printf ("LLFE: %d exited.\n", lwpid);
2364 /* If there is at least one more LWP, then the exit signal was
2365 not the end of the debugged application and should be
2366 ignored, unless GDB wants to hear about thread exits. */
2367 if (report_thread_events
2368 || last_thread_of_process_p (pid_of (thread)))
2370 /* Since events are serialized to GDB core, and we can't
2371 report this one right now. Leave the status pending for
2372 the next time we're able to report it. */
2373 mark_lwp_dead (child, wstat);
2383 gdb_assert (WIFSTOPPED (wstat));
2385 if (WIFSTOPPED (wstat))
2387 struct process_info *proc;
2389 /* Architecture-specific setup after inferior is running. */
2390 proc = find_process_pid (pid_of (thread));
2391 if (proc->tdesc == NULL)
2395 /* This needs to happen after we have attached to the
2396 inferior and it is stopped for the first time, but
2397 before we access any inferior registers. */
2398 linux_arch_setup_thread (thread);
2402 /* The process is started, but GDBserver will do
2403 architecture-specific setup after the program stops at
2404 the first instruction. */
2405 child->status_pending_p = 1;
2406 child->status_pending = wstat;
2412 if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags)
2414 struct process_info *proc = find_process_pid (pid_of (thread));
2415 int options = linux_low_ptrace_options (proc->attached);
2417 linux_enable_event_reporting (lwpid, options);
2418 child->must_set_ptrace_flags = 0;
2421 /* Always update syscall_state, even if it will be filtered later. */
2422 if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SYSCALL_SIGTRAP)
2424 child->syscall_state
2425 = (child->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY
2426 ? TARGET_WAITKIND_SYSCALL_RETURN
2427 : TARGET_WAITKIND_SYSCALL_ENTRY);
2431 /* Almost all other ptrace-stops are known to be outside of system
2432 calls, with further exceptions in handle_extended_wait. */
2433 child->syscall_state = TARGET_WAITKIND_IGNORE;
2436 /* Be careful to not overwrite stop_pc until
2437 check_stopped_by_breakpoint is called. */
2438 if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP
2439 && linux_is_extended_waitstatus (wstat))
2441 child->stop_pc = get_pc (child);
2442 if (handle_extended_wait (&child, wstat))
2444 /* The event has been handled, so just return without
2450 /* Check first whether this was a SW/HW breakpoint before checking
2451 watchpoints, because at least s390 can't tell the data address of
2452 hardware watchpoint hits, and returns stopped-by-watchpoint as
2453 long as there's a watchpoint set. */
2454 if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat))
2456 if (check_stopped_by_breakpoint (child))
2460 /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint
2461 or hardware watchpoint. Check which is which if we got
2462 TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single
2463 stepped an instruction that triggered a watchpoint. In that
2464 case, on some architectures (such as x86), instead of
2465 TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check
2466 the debug registers separately. */
2467 if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP
2468 && child->stop_reason != TARGET_STOPPED_BY_SW_BREAKPOINT)
2469 check_stopped_by_watchpoint (child);
2472 child->stop_pc = get_pc (child);
2474 if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP
2475 && child->stop_expected)
2478 debug_printf ("Expected stop.\n");
2479 child->stop_expected = 0;
2481 if (thread->last_resume_kind == resume_stop)
2483 /* We want to report the stop to the core. Treat the
2484 SIGSTOP as a normal event. */
2486 debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n",
2487 target_pid_to_str (ptid_of (thread)));
2489 else if (stopping_threads != NOT_STOPPING_THREADS)
2491 /* Stopping threads. We don't want this SIGSTOP to end up
2494 debug_printf ("LLW: SIGSTOP caught for %s "
2495 "while stopping threads.\n",
2496 target_pid_to_str (ptid_of (thread)));
2501 /* This is a delayed SIGSTOP. Filter out the event. */
2503 debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n",
2504 child->stepping ? "step" : "continue",
2505 target_pid_to_str (ptid_of (thread)));
2507 linux_resume_one_lwp (child, child->stepping, 0, NULL);
2512 child->status_pending_p = 1;
2513 child->status_pending = wstat;
2517 /* Resume LWPs that are currently stopped without any pending status
2518 to report, but are resumed from the core's perspective. */
2521 resume_stopped_resumed_lwps (struct inferior_list_entry *entry)
2523 struct thread_info *thread = (struct thread_info *) entry;
2524 struct lwp_info *lp = get_thread_lwp (thread);
2528 && !lp->status_pending_p
2529 && thread->last_status.kind == TARGET_WAITKIND_IGNORE)
2531 int step = thread->last_resume_kind == resume_step;
2534 debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n",
2535 target_pid_to_str (ptid_of (thread)),
2536 paddress (lp->stop_pc),
2539 linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL);
2543 /* Wait for an event from child(ren) WAIT_PTID, and return any that
2544 match FILTER_PTID (leaving others pending). The PTIDs can be:
2545 minus_one_ptid, to specify any child; a pid PTID, specifying all
2546 lwps of a thread group; or a PTID representing a single lwp. Store
2547 the stop status through the status pointer WSTAT. OPTIONS is
2548 passed to the waitpid call. Return 0 if no event was found and
2549 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2550 was found. Return the PID of the stopped child otherwise. */
2553 linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid,
2554 int *wstatp, int options)
2556 struct thread_info *event_thread;
2557 struct lwp_info *event_child, *requested_child;
2558 sigset_t block_mask, prev_mask;
2561 /* N.B. event_thread points to the thread_info struct that contains
2562 event_child. Keep them in sync. */
2563 event_thread = NULL;
2565 requested_child = NULL;
2567 /* Check for a lwp with a pending status. */
2569 if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid))
2571 event_thread = (struct thread_info *)
2572 find_inferior (&all_threads, status_pending_p_callback, &filter_ptid);
2573 if (event_thread != NULL)
2574 event_child = get_thread_lwp (event_thread);
2575 if (debug_threads && event_thread)
2576 debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread));
2578 else if (!ptid_equal (filter_ptid, null_ptid))
2580 requested_child = find_lwp_pid (filter_ptid);
2582 if (stopping_threads == NOT_STOPPING_THREADS
2583 && requested_child->status_pending_p
2584 && requested_child->collecting_fast_tracepoint)
2586 enqueue_one_deferred_signal (requested_child,
2587 &requested_child->status_pending);
2588 requested_child->status_pending_p = 0;
2589 requested_child->status_pending = 0;
2590 linux_resume_one_lwp (requested_child, 0, 0, NULL);
2593 if (requested_child->suspended
2594 && requested_child->status_pending_p)
2596 internal_error (__FILE__, __LINE__,
2597 "requesting an event out of a"
2598 " suspended child?");
2601 if (requested_child->status_pending_p)
2603 event_child = requested_child;
2604 event_thread = get_lwp_thread (event_child);
2608 if (event_child != NULL)
2611 debug_printf ("Got an event from pending child %ld (%04x)\n",
2612 lwpid_of (event_thread), event_child->status_pending);
2613 *wstatp = event_child->status_pending;
2614 event_child->status_pending_p = 0;
2615 event_child->status_pending = 0;
2616 current_thread = event_thread;
2617 return lwpid_of (event_thread);
2620 /* But if we don't find a pending event, we'll have to wait.
2622 We only enter this loop if no process has a pending wait status.
2623 Thus any action taken in response to a wait status inside this
2624 loop is responding as soon as we detect the status, not after any
2627 /* Make sure SIGCHLD is blocked until the sigsuspend below. Block
2628 all signals while here. */
2629 sigfillset (&block_mask);
2630 sigprocmask (SIG_BLOCK, &block_mask, &prev_mask);
2632 /* Always pull all events out of the kernel. We'll randomly select
2633 an event LWP out of all that have events, to prevent
2635 while (event_child == NULL)
2639 /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
2642 - If the thread group leader exits while other threads in the
2643 thread group still exist, waitpid(TGID, ...) hangs. That
2644 waitpid won't return an exit status until the other threads
2645 in the group are reaped.
2647 - When a non-leader thread execs, that thread just vanishes
2648 without reporting an exit (so we'd hang if we waited for it
2649 explicitly in that case). The exec event is reported to
2652 ret = my_waitpid (-1, wstatp, options | WNOHANG);
2655 debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n",
2656 ret, errno ? strerror (errno) : "ERRNO-OK");
2662 debug_printf ("LLW: waitpid %ld received %s\n",
2663 (long) ret, status_to_str (*wstatp));
2666 /* Filter all events. IOW, leave all events pending. We'll
2667 randomly select an event LWP out of all that have events
2669 linux_low_filter_event (ret, *wstatp);
2670 /* Retry until nothing comes out of waitpid. A single
2671 SIGCHLD can indicate more than one child stopped. */
2675 /* Now that we've pulled all events out of the kernel, resume
2676 LWPs that don't have an interesting event to report. */
2677 if (stopping_threads == NOT_STOPPING_THREADS)
2678 for_each_inferior (&all_threads, resume_stopped_resumed_lwps);
2680 /* ... and find an LWP with a status to report to the core, if
2682 event_thread = (struct thread_info *)
2683 find_inferior (&all_threads, status_pending_p_callback, &filter_ptid);
2684 if (event_thread != NULL)
2686 event_child = get_thread_lwp (event_thread);
2687 *wstatp = event_child->status_pending;
2688 event_child->status_pending_p = 0;
2689 event_child->status_pending = 0;
2693 /* Check for zombie thread group leaders. Those can't be reaped
2694 until all other threads in the thread group are. */
2695 check_zombie_leaders ();
2697 /* If there are no resumed children left in the set of LWPs we
2698 want to wait for, bail. We can't just block in
2699 waitpid/sigsuspend, because lwps might have been left stopped
2700 in trace-stop state, and we'd be stuck forever waiting for
2701 their status to change (which would only happen if we resumed
2702 them). Even if WNOHANG is set, this return code is preferred
2703 over 0 (below), as it is more detailed. */
2704 if ((find_inferior (&all_threads,
2705 not_stopped_callback,
2706 &wait_ptid) == NULL))
2709 debug_printf ("LLW: exit (no unwaited-for LWP)\n");
2710 sigprocmask (SIG_SETMASK, &prev_mask, NULL);
2714 /* No interesting event to report to the caller. */
2715 if ((options & WNOHANG))
2718 debug_printf ("WNOHANG set, no event found\n");
2720 sigprocmask (SIG_SETMASK, &prev_mask, NULL);
2724 /* Block until we get an event reported with SIGCHLD. */
2726 debug_printf ("sigsuspend'ing\n");
2728 sigsuspend (&prev_mask);
2729 sigprocmask (SIG_SETMASK, &prev_mask, NULL);
2733 sigprocmask (SIG_SETMASK, &prev_mask, NULL);
2735 current_thread = event_thread;
2737 return lwpid_of (event_thread);
2740 /* Wait for an event from child(ren) PTID. PTIDs can be:
2741 minus_one_ptid, to specify any child; a pid PTID, specifying all
2742 lwps of a thread group; or a PTID representing a single lwp. Store
2743 the stop status through the status pointer WSTAT. OPTIONS is
2744 passed to the waitpid call. Return 0 if no event was found and
2745 OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
2746 was found. Return the PID of the stopped child otherwise. */
2749 linux_wait_for_event (ptid_t ptid, int *wstatp, int options)
2751 return linux_wait_for_event_filtered (ptid, ptid, wstatp, options);
2754 /* Count the LWP's that have had events. */
2757 count_events_callback (struct inferior_list_entry *entry, void *data)
2759 struct thread_info *thread = (struct thread_info *) entry;
2760 struct lwp_info *lp = get_thread_lwp (thread);
2761 int *count = (int *) data;
2763 gdb_assert (count != NULL);
2765 /* Count only resumed LWPs that have an event pending. */
2766 if (thread->last_status.kind == TARGET_WAITKIND_IGNORE
2767 && lp->status_pending_p)
2773 /* Select the LWP (if any) that is currently being single-stepped. */
2776 select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data)
2778 struct thread_info *thread = (struct thread_info *) entry;
2779 struct lwp_info *lp = get_thread_lwp (thread);
2781 if (thread->last_status.kind == TARGET_WAITKIND_IGNORE
2782 && thread->last_resume_kind == resume_step
2783 && lp->status_pending_p)
2789 /* Select the Nth LWP that has had an event. */
2792 select_event_lwp_callback (struct inferior_list_entry *entry, void *data)
2794 struct thread_info *thread = (struct thread_info *) entry;
2795 struct lwp_info *lp = get_thread_lwp (thread);
2796 int *selector = (int *) data;
2798 gdb_assert (selector != NULL);
2800 /* Select only resumed LWPs that have an event pending. */
2801 if (thread->last_status.kind == TARGET_WAITKIND_IGNORE
2802 && lp->status_pending_p)
2803 if ((*selector)-- == 0)
2809 /* Select one LWP out of those that have events pending. */
2812 select_event_lwp (struct lwp_info **orig_lp)
2815 int random_selector;
2816 struct thread_info *event_thread = NULL;
2818 /* In all-stop, give preference to the LWP that is being
2819 single-stepped. There will be at most one, and it's the LWP that
2820 the core is most interested in. If we didn't do this, then we'd
2821 have to handle pending step SIGTRAPs somehow in case the core
2822 later continues the previously-stepped thread, otherwise we'd
2823 report the pending SIGTRAP, and the core, not having stepped the
2824 thread, wouldn't understand what the trap was for, and therefore
2825 would report it to the user as a random signal. */
2829 = (struct thread_info *) find_inferior (&all_threads,
2830 select_singlestep_lwp_callback,
2832 if (event_thread != NULL)
2835 debug_printf ("SEL: Select single-step %s\n",
2836 target_pid_to_str (ptid_of (event_thread)));
2839 if (event_thread == NULL)
2841 /* No single-stepping LWP. Select one at random, out of those
2842 which have had events. */
2844 /* First see how many events we have. */
2845 find_inferior (&all_threads, count_events_callback, &num_events);
2846 gdb_assert (num_events > 0);
2848 /* Now randomly pick a LWP out of those that have had
2850 random_selector = (int)
2851 ((num_events * (double) rand ()) / (RAND_MAX + 1.0));
2853 if (debug_threads && num_events > 1)
2854 debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n",
2855 num_events, random_selector);
2858 = (struct thread_info *) find_inferior (&all_threads,
2859 select_event_lwp_callback,
2863 if (event_thread != NULL)
2865 struct lwp_info *event_lp = get_thread_lwp (event_thread);
2867 /* Switch the event LWP. */
2868 *orig_lp = event_lp;
2872 /* Decrement the suspend count of an LWP. */
2875 unsuspend_one_lwp (struct inferior_list_entry *entry, void *except)
2877 struct thread_info *thread = (struct thread_info *) entry;
2878 struct lwp_info *lwp = get_thread_lwp (thread);
2880 /* Ignore EXCEPT. */
2884 lwp_suspended_decr (lwp);
2888 /* Decrement the suspend count of all LWPs, except EXCEPT, if non
2892 unsuspend_all_lwps (struct lwp_info *except)
2894 find_inferior (&all_threads, unsuspend_one_lwp, except);
2897 static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry);
2898 static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry,
2900 static int lwp_running (struct inferior_list_entry *entry, void *data);
2901 static ptid_t linux_wait_1 (ptid_t ptid,
2902 struct target_waitstatus *ourstatus,
2903 int target_options);
2905 /* Stabilize threads (move out of jump pads).
2907 If a thread is midway collecting a fast tracepoint, we need to
2908 finish the collection and move it out of the jump pad before
2909 reporting the signal.
2911 This avoids recursion while collecting (when a signal arrives
2912 midway, and the signal handler itself collects), which would trash
2913 the trace buffer. In case the user set a breakpoint in a signal
2914 handler, this avoids the backtrace showing the jump pad, etc..
2915 Most importantly, there are certain things we can't do safely if
2916 threads are stopped in a jump pad (or in its callee's). For
2919 - starting a new trace run. A thread still collecting the
2920 previous run, could trash the trace buffer when resumed. The trace
2921 buffer control structures would have been reset but the thread had
2922 no way to tell. The thread could even midway memcpy'ing to the
2923 buffer, which would mean that when resumed, it would clobber the
2924 trace buffer that had been set for a new run.
2926 - we can't rewrite/reuse the jump pads for new tracepoints
2927 safely. Say you do tstart while a thread is stopped midway while
2928 collecting. When the thread is later resumed, it finishes the
2929 collection, and returns to the jump pad, to execute the original
2930 instruction that was under the tracepoint jump at the time the
2931 older run had been started. If the jump pad had been rewritten
2932 since for something else in the new run, the thread would now
2933 execute the wrong / random instructions. */
2936 linux_stabilize_threads (void)
2938 struct thread_info *saved_thread;
2939 struct thread_info *thread_stuck;
2942 = (struct thread_info *) find_inferior (&all_threads,
2943 stuck_in_jump_pad_callback,
2945 if (thread_stuck != NULL)
2948 debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n",
2949 lwpid_of (thread_stuck));
2953 saved_thread = current_thread;
2955 stabilizing_threads = 1;
2958 for_each_inferior (&all_threads, move_out_of_jump_pad_callback);
2960 /* Loop until all are stopped out of the jump pads. */
2961 while (find_inferior (&all_threads, lwp_running, NULL) != NULL)
2963 struct target_waitstatus ourstatus;
2964 struct lwp_info *lwp;
2967 /* Note that we go through the full wait even loop. While
2968 moving threads out of jump pad, we need to be able to step
2969 over internal breakpoints and such. */
2970 linux_wait_1 (minus_one_ptid, &ourstatus, 0);
2972 if (ourstatus.kind == TARGET_WAITKIND_STOPPED)
2974 lwp = get_thread_lwp (current_thread);
2977 lwp_suspended_inc (lwp);
2979 if (ourstatus.value.sig != GDB_SIGNAL_0
2980 || current_thread->last_resume_kind == resume_stop)
2982 wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig));
2983 enqueue_one_deferred_signal (lwp, &wstat);
2988 find_inferior (&all_threads, unsuspend_one_lwp, NULL);
2990 stabilizing_threads = 0;
2992 current_thread = saved_thread;
2997 = (struct thread_info *) find_inferior (&all_threads,
2998 stuck_in_jump_pad_callback,
3000 if (thread_stuck != NULL)
3001 debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n",
3002 lwpid_of (thread_stuck));
3006 /* Convenience function that is called when the kernel reports an
3007 event that is not passed out to GDB. */
3010 ignore_event (struct target_waitstatus *ourstatus)
3012 /* If we got an event, there may still be others, as a single
3013 SIGCHLD can indicate more than one child stopped. This forces
3014 another target_wait call. */
3017 ourstatus->kind = TARGET_WAITKIND_IGNORE;
3021 /* Convenience function that is called when the kernel reports an exit
3022 event. This decides whether to report the event to GDB as a
3023 process exit event, a thread exit event, or to suppress the
3027 filter_exit_event (struct lwp_info *event_child,
3028 struct target_waitstatus *ourstatus)
3030 struct thread_info *thread = get_lwp_thread (event_child);
3031 ptid_t ptid = ptid_of (thread);
3033 if (!last_thread_of_process_p (pid_of (thread)))
3035 if (report_thread_events)
3036 ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED;
3038 ourstatus->kind = TARGET_WAITKIND_IGNORE;
3040 delete_lwp (event_child);
3045 /* Returns 1 if GDB is interested in any event_child syscalls. */
3048 gdb_catching_syscalls_p (struct lwp_info *event_child)
3050 struct thread_info *thread = get_lwp_thread (event_child);
3051 struct process_info *proc = get_thread_process (thread);
3053 return !VEC_empty (int, proc->syscalls_to_catch);
3056 /* Returns 1 if GDB is interested in the event_child syscall.
3057 Only to be called when stopped reason is SYSCALL_SIGTRAP. */
3060 gdb_catch_this_syscall_p (struct lwp_info *event_child)
3064 struct thread_info *thread = get_lwp_thread (event_child);
3065 struct process_info *proc = get_thread_process (thread);
3067 if (VEC_empty (int, proc->syscalls_to_catch))
3070 if (VEC_index (int, proc->syscalls_to_catch, 0) == ANY_SYSCALL)
3073 get_syscall_trapinfo (event_child, &sysno, &sysret);
3075 VEC_iterate (int, proc->syscalls_to_catch, i, iter);
3083 /* Wait for process, returns status. */
3086 linux_wait_1 (ptid_t ptid,
3087 struct target_waitstatus *ourstatus, int target_options)
3090 struct lwp_info *event_child;
3093 int step_over_finished;
3094 int bp_explains_trap;
3095 int maybe_internal_trap;
3104 debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid));
3107 /* Translate generic target options into linux options. */
3109 if (target_options & TARGET_WNOHANG)
3112 bp_explains_trap = 0;
3115 ourstatus->kind = TARGET_WAITKIND_IGNORE;
3117 /* Find a resumed LWP, if any. */
3118 if (find_inferior (&all_threads,
3119 status_pending_p_callback,
3120 &minus_one_ptid) != NULL)
3122 else if ((find_inferior (&all_threads,
3123 not_stopped_callback,
3124 &minus_one_ptid) != NULL))
3129 if (ptid_equal (step_over_bkpt, null_ptid))
3130 pid = linux_wait_for_event (ptid, &w, options);
3134 debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n",
3135 target_pid_to_str (step_over_bkpt));
3136 pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG);
3139 if (pid == 0 || (pid == -1 && !any_resumed))
3141 gdb_assert (target_options & TARGET_WNOHANG);
3145 debug_printf ("linux_wait_1 ret = null_ptid, "
3146 "TARGET_WAITKIND_IGNORE\n");
3150 ourstatus->kind = TARGET_WAITKIND_IGNORE;
3157 debug_printf ("linux_wait_1 ret = null_ptid, "
3158 "TARGET_WAITKIND_NO_RESUMED\n");
3162 ourstatus->kind = TARGET_WAITKIND_NO_RESUMED;
3166 event_child = get_thread_lwp (current_thread);
3168 /* linux_wait_for_event only returns an exit status for the last
3169 child of a process. Report it. */
3170 if (WIFEXITED (w) || WIFSIGNALED (w))
3174 ourstatus->kind = TARGET_WAITKIND_EXITED;
3175 ourstatus->value.integer = WEXITSTATUS (w);
3179 debug_printf ("linux_wait_1 ret = %s, exited with "
3181 target_pid_to_str (ptid_of (current_thread)),
3188 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
3189 ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w));
3193 debug_printf ("linux_wait_1 ret = %s, terminated with "
3195 target_pid_to_str (ptid_of (current_thread)),
3201 if (ourstatus->kind == TARGET_WAITKIND_EXITED)
3202 return filter_exit_event (event_child, ourstatus);
3204 return ptid_of (current_thread);
3207 /* If step-over executes a breakpoint instruction, in the case of a
3208 hardware single step it means a gdb/gdbserver breakpoint had been
3209 planted on top of a permanent breakpoint, in the case of a software
3210 single step it may just mean that gdbserver hit the reinsert breakpoint.
3211 The PC has been adjusted by check_stopped_by_breakpoint to point at
3212 the breakpoint address.
3213 So in the case of the hardware single step advance the PC manually
3214 past the breakpoint and in the case of software single step advance only
3215 if it's not the reinsert_breakpoint we are hitting.
3216 This avoids that a program would keep trapping a permanent breakpoint
3218 if (!ptid_equal (step_over_bkpt, null_ptid)
3219 && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT
3220 && (event_child->stepping
3221 || !reinsert_breakpoint_inserted_here (event_child->stop_pc)))
3223 int increment_pc = 0;
3224 int breakpoint_kind = 0;
3225 CORE_ADDR stop_pc = event_child->stop_pc;
3228 the_target->breakpoint_kind_from_current_state (&stop_pc);
3229 the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc);
3233 debug_printf ("step-over for %s executed software breakpoint\n",
3234 target_pid_to_str (ptid_of (current_thread)));
3237 if (increment_pc != 0)
3239 struct regcache *regcache
3240 = get_thread_regcache (current_thread, 1);
3242 event_child->stop_pc += increment_pc;
3243 (*the_low_target.set_pc) (regcache, event_child->stop_pc);
3245 if (!(*the_low_target.breakpoint_at) (event_child->stop_pc))
3246 event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON;
3250 /* If this event was not handled before, and is not a SIGTRAP, we
3251 report it. SIGILL and SIGSEGV are also treated as traps in case
3252 a breakpoint is inserted at the current PC. If this target does
3253 not support internal breakpoints at all, we also report the
3254 SIGTRAP without further processing; it's of no concern to us. */
3256 = (supports_breakpoints ()
3257 && (WSTOPSIG (w) == SIGTRAP
3258 || ((WSTOPSIG (w) == SIGILL
3259 || WSTOPSIG (w) == SIGSEGV)
3260 && (*the_low_target.breakpoint_at) (event_child->stop_pc))));
3262 if (maybe_internal_trap)
3264 /* Handle anything that requires bookkeeping before deciding to
3265 report the event or continue waiting. */
3267 /* First check if we can explain the SIGTRAP with an internal
3268 breakpoint, or if we should possibly report the event to GDB.
3269 Do this before anything that may remove or insert a
3271 bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc);
3273 /* We have a SIGTRAP, possibly a step-over dance has just
3274 finished. If so, tweak the state machine accordingly,
3275 reinsert breakpoints and delete any reinsert (software
3276 single-step) breakpoints. */
3277 step_over_finished = finish_step_over (event_child);
3279 /* Now invoke the callbacks of any internal breakpoints there. */
3280 check_breakpoints (event_child->stop_pc);
3282 /* Handle tracepoint data collecting. This may overflow the
3283 trace buffer, and cause a tracing stop, removing
3285 trace_event = handle_tracepoints (event_child);
3287 if (bp_explains_trap)
3289 /* If we stepped or ran into an internal breakpoint, we've
3290 already handled it. So next time we resume (from this
3291 PC), we should step over it. */
3293 debug_printf ("Hit a gdbserver breakpoint.\n");
3295 if (breakpoint_here (event_child->stop_pc))
3296 event_child->need_step_over = 1;
3301 /* We have some other signal, possibly a step-over dance was in
3302 progress, and it should be cancelled too. */
3303 step_over_finished = finish_step_over (event_child);
3306 /* We have all the data we need. Either report the event to GDB, or
3307 resume threads and keep waiting for more. */
3309 /* If we're collecting a fast tracepoint, finish the collection and
3310 move out of the jump pad before delivering a signal. See
3311 linux_stabilize_threads. */
3314 && WSTOPSIG (w) != SIGTRAP
3315 && supports_fast_tracepoints ()
3316 && agent_loaded_p ())
3319 debug_printf ("Got signal %d for LWP %ld. Check if we need "
3320 "to defer or adjust it.\n",
3321 WSTOPSIG (w), lwpid_of (current_thread));
3323 /* Allow debugging the jump pad itself. */
3324 if (current_thread->last_resume_kind != resume_step
3325 && maybe_move_out_of_jump_pad (event_child, &w))
3327 enqueue_one_deferred_signal (event_child, &w);
3330 debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n",
3331 WSTOPSIG (w), lwpid_of (current_thread));
3333 linux_resume_one_lwp (event_child, 0, 0, NULL);
3335 return ignore_event (ourstatus);
3339 if (event_child->collecting_fast_tracepoint)
3342 debug_printf ("LWP %ld was trying to move out of the jump pad (%d). "
3343 "Check if we're already there.\n",
3344 lwpid_of (current_thread),
3345 event_child->collecting_fast_tracepoint);
3349 event_child->collecting_fast_tracepoint
3350 = linux_fast_tracepoint_collecting (event_child, NULL);
3352 if (event_child->collecting_fast_tracepoint != 1)
3354 /* No longer need this breakpoint. */
3355 if (event_child->exit_jump_pad_bkpt != NULL)
3358 debug_printf ("No longer need exit-jump-pad bkpt; removing it."
3359 "stopping all threads momentarily.\n");
3361 /* Other running threads could hit this breakpoint.
3362 We don't handle moribund locations like GDB does,
3363 instead we always pause all threads when removing
3364 breakpoints, so that any step-over or
3365 decr_pc_after_break adjustment is always taken
3366 care of while the breakpoint is still
3368 stop_all_lwps (1, event_child);
3370 delete_breakpoint (event_child->exit_jump_pad_bkpt);
3371 event_child->exit_jump_pad_bkpt = NULL;
3373 unstop_all_lwps (1, event_child);
3375 gdb_assert (event_child->suspended >= 0);
3379 if (event_child->collecting_fast_tracepoint == 0)
3382 debug_printf ("fast tracepoint finished "
3383 "collecting successfully.\n");
3385 /* We may have a deferred signal to report. */
3386 if (dequeue_one_deferred_signal (event_child, &w))
3389 debug_printf ("dequeued one signal.\n");
3394 debug_printf ("no deferred signals.\n");
3396 if (stabilizing_threads)
3398 ourstatus->kind = TARGET_WAITKIND_STOPPED;
3399 ourstatus->value.sig = GDB_SIGNAL_0;
3403 debug_printf ("linux_wait_1 ret = %s, stopped "
3404 "while stabilizing threads\n",
3405 target_pid_to_str (ptid_of (current_thread)));
3409 return ptid_of (current_thread);
3415 /* Check whether GDB would be interested in this event. */
3417 /* Check if GDB is interested in this syscall. */
3419 && WSTOPSIG (w) == SYSCALL_SIGTRAP
3420 && !gdb_catch_this_syscall_p (event_child))
3424 debug_printf ("Ignored syscall for LWP %ld.\n",
3425 lwpid_of (current_thread));
3428 linux_resume_one_lwp (event_child, event_child->stepping,
3430 return ignore_event (ourstatus);
3433 /* If GDB is not interested in this signal, don't stop other
3434 threads, and don't report it to GDB. Just resume the inferior
3435 right away. We do this for threading-related signals as well as
3436 any that GDB specifically requested we ignore. But never ignore
3437 SIGSTOP if we sent it ourselves, and do not ignore signals when
3438 stepping - they may require special handling to skip the signal
3439 handler. Also never ignore signals that could be caused by a
3442 && current_thread->last_resume_kind != resume_step
3444 #if defined (USE_THREAD_DB) && !defined (__ANDROID__)
3445 (current_process ()->priv->thread_db != NULL
3446 && (WSTOPSIG (w) == __SIGRTMIN
3447 || WSTOPSIG (w) == __SIGRTMIN + 1))
3450 (pass_signals[gdb_signal_from_host (WSTOPSIG (w))]
3451 && !(WSTOPSIG (w) == SIGSTOP
3452 && current_thread->last_resume_kind == resume_stop)
3453 && !linux_wstatus_maybe_breakpoint (w))))
3455 siginfo_t info, *info_p;
3458 debug_printf ("Ignored signal %d for LWP %ld.\n",
3459 WSTOPSIG (w), lwpid_of (current_thread));
3461 if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread),
3462 (PTRACE_TYPE_ARG3) 0, &info) == 0)
3467 if (step_over_finished)
3469 /* We cancelled this thread's step-over above. We still
3470 need to unsuspend all other LWPs, and set them back
3471 running again while the signal handler runs. */
3472 unsuspend_all_lwps (event_child);
3474 /* Enqueue the pending signal info so that proceed_all_lwps
3476 enqueue_pending_signal (event_child, WSTOPSIG (w), info_p);
3478 proceed_all_lwps ();
3482 linux_resume_one_lwp (event_child, event_child->stepping,
3483 WSTOPSIG (w), info_p);
3485 return ignore_event (ourstatus);
3488 /* Note that all addresses are always "out of the step range" when
3489 there's no range to begin with. */
3490 in_step_range = lwp_in_step_range (event_child);
3492 /* If GDB wanted this thread to single step, and the thread is out
3493 of the step range, we always want to report the SIGTRAP, and let
3494 GDB handle it. Watchpoints should always be reported. So should
3495 signals we can't explain. A SIGTRAP we can't explain could be a
3496 GDB breakpoint --- we may or not support Z0 breakpoints. If we
3497 do, we're be able to handle GDB breakpoints on top of internal
3498 breakpoints, by handling the internal breakpoint and still
3499 reporting the event to GDB. If we don't, we're out of luck, GDB
3500 won't see the breakpoint hit. If we see a single-step event but
3501 the thread should be continuing, don't pass the trap to gdb.
3502 That indicates that we had previously finished a single-step but
3503 left the single-step pending -- see
3504 complete_ongoing_step_over. */
3505 report_to_gdb = (!maybe_internal_trap
3506 || (current_thread->last_resume_kind == resume_step
3508 || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT
3510 && !bp_explains_trap
3512 && !step_over_finished
3513 && !(current_thread->last_resume_kind == resume_continue
3514 && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP))
3515 || (gdb_breakpoint_here (event_child->stop_pc)
3516 && gdb_condition_true_at_breakpoint (event_child->stop_pc)
3517 && gdb_no_commands_at_breakpoint (event_child->stop_pc))
3518 || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE);
3520 run_breakpoint_commands (event_child->stop_pc);
3522 /* We found no reason GDB would want us to stop. We either hit one
3523 of our own breakpoints, or finished an internal step GDB
3524 shouldn't know about. */
3529 if (bp_explains_trap)
3530 debug_printf ("Hit a gdbserver breakpoint.\n");
3531 if (step_over_finished)
3532 debug_printf ("Step-over finished.\n");
3534 debug_printf ("Tracepoint event.\n");
3535 if (lwp_in_step_range (event_child))
3536 debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n",
3537 paddress (event_child->stop_pc),
3538 paddress (event_child->step_range_start),
3539 paddress (event_child->step_range_end));
3542 /* We're not reporting this breakpoint to GDB, so apply the
3543 decr_pc_after_break adjustment to the inferior's regcache
3546 if (the_low_target.set_pc != NULL)
3548 struct regcache *regcache
3549 = get_thread_regcache (current_thread, 1);
3550 (*the_low_target.set_pc) (regcache, event_child->stop_pc);
3553 /* We may have finished stepping over a breakpoint. If so,
3554 we've stopped and suspended all LWPs momentarily except the
3555 stepping one. This is where we resume them all again. We're
3556 going to keep waiting, so use proceed, which handles stepping
3557 over the next breakpoint. */
3559 debug_printf ("proceeding all threads.\n");
3561 if (step_over_finished)
3562 unsuspend_all_lwps (event_child);
3564 proceed_all_lwps ();
3565 return ignore_event (ourstatus);
3570 if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE)
3574 str = target_waitstatus_to_string (&event_child->waitstatus);
3575 debug_printf ("LWP %ld: extended event with waitstatus %s\n",
3576 lwpid_of (get_lwp_thread (event_child)), str);
3579 if (current_thread->last_resume_kind == resume_step)
3581 if (event_child->step_range_start == event_child->step_range_end)
3582 debug_printf ("GDB wanted to single-step, reporting event.\n");
3583 else if (!lwp_in_step_range (event_child))
3584 debug_printf ("Out of step range, reporting event.\n");
3586 if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT)
3587 debug_printf ("Stopped by watchpoint.\n");
3588 else if (gdb_breakpoint_here (event_child->stop_pc))
3589 debug_printf ("Stopped by GDB breakpoint.\n");
3591 debug_printf ("Hit a non-gdbserver trap event.\n");
3594 /* Alright, we're going to report a stop. */
3596 if (!stabilizing_threads)
3598 /* In all-stop, stop all threads. */
3600 stop_all_lwps (0, NULL);
3602 /* If we're not waiting for a specific LWP, choose an event LWP
3603 from among those that have had events. Giving equal priority
3604 to all LWPs that have had events helps prevent
3606 if (ptid_equal (ptid, minus_one_ptid))
3608 event_child->status_pending_p = 1;
3609 event_child->status_pending = w;
3611 select_event_lwp (&event_child);
3613 /* current_thread and event_child must stay in sync. */
3614 current_thread = get_lwp_thread (event_child);
3616 event_child->status_pending_p = 0;
3617 w = event_child->status_pending;
3620 if (step_over_finished)
3624 /* If we were doing a step-over, all other threads but
3625 the stepping one had been paused in start_step_over,
3626 with their suspend counts incremented. We don't want
3627 to do a full unstop/unpause, because we're in
3628 all-stop mode (so we want threads stopped), but we
3629 still need to unsuspend the other threads, to
3630 decrement their `suspended' count back. */
3631 unsuspend_all_lwps (event_child);
3635 /* If we just finished a step-over, then all threads had
3636 been momentarily paused. In all-stop, that's fine,
3637 we want threads stopped by now anyway. In non-stop,
3638 we need to re-resume threads that GDB wanted to be
3640 unstop_all_lwps (1, event_child);
3644 /* Stabilize threads (move out of jump pads). */
3646 stabilize_threads ();
3650 /* If we just finished a step-over, then all threads had been
3651 momentarily paused. In all-stop, that's fine, we want
3652 threads stopped by now anyway. In non-stop, we need to
3653 re-resume threads that GDB wanted to be running. */
3654 if (step_over_finished)
3655 unstop_all_lwps (1, event_child);
3658 if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE)
3660 /* If the reported event is an exit, fork, vfork or exec, let
3662 *ourstatus = event_child->waitstatus;
3663 /* Clear the event lwp's waitstatus since we handled it already. */
3664 event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE;
3667 ourstatus->kind = TARGET_WAITKIND_STOPPED;
3669 /* Now that we've selected our final event LWP, un-adjust its PC if
3670 it was a software breakpoint, and the client doesn't know we can
3671 adjust the breakpoint ourselves. */
3672 if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT
3673 && !swbreak_feature)
3675 int decr_pc = the_low_target.decr_pc_after_break;
3679 struct regcache *regcache
3680 = get_thread_regcache (current_thread, 1);
3681 (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc);
3685 if (WSTOPSIG (w) == SYSCALL_SIGTRAP)
3689 get_syscall_trapinfo (event_child,
3690 &ourstatus->value.syscall_number, &sysret);
3691 ourstatus->kind = event_child->syscall_state;
3693 else if (current_thread->last_resume_kind == resume_stop
3694 && WSTOPSIG (w) == SIGSTOP)
3696 /* A thread that has been requested to stop by GDB with vCont;t,
3697 and it stopped cleanly, so report as SIG0. The use of
3698 SIGSTOP is an implementation detail. */
3699 ourstatus->value.sig = GDB_SIGNAL_0;
3701 else if (current_thread->last_resume_kind == resume_stop
3702 && WSTOPSIG (w) != SIGSTOP)
3704 /* A thread that has been requested to stop by GDB with vCont;t,
3705 but, it stopped for other reasons. */
3706 ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w));
3708 else if (ourstatus->kind == TARGET_WAITKIND_STOPPED)
3710 ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w));
3713 gdb_assert (ptid_equal (step_over_bkpt, null_ptid));
3717 debug_printf ("linux_wait_1 ret = %s, %d, %d\n",
3718 target_pid_to_str (ptid_of (current_thread)),
3719 ourstatus->kind, ourstatus->value.sig);
3723 if (ourstatus->kind == TARGET_WAITKIND_EXITED)
3724 return filter_exit_event (event_child, ourstatus);
3726 return ptid_of (current_thread);
3729 /* Get rid of any pending event in the pipe. */
3731 async_file_flush (void)
3737 ret = read (linux_event_pipe[0], &buf, 1);
3738 while (ret >= 0 || (ret == -1 && errno == EINTR));
3741 /* Put something in the pipe, so the event loop wakes up. */
3743 async_file_mark (void)
3747 async_file_flush ();
3750 ret = write (linux_event_pipe[1], "+", 1);
3751 while (ret == 0 || (ret == -1 && errno == EINTR));
3753 /* Ignore EAGAIN. If the pipe is full, the event loop will already
3754 be awakened anyway. */
3758 linux_wait (ptid_t ptid,
3759 struct target_waitstatus *ourstatus, int target_options)
3763 /* Flush the async file first. */
3764 if (target_is_async_p ())
3765 async_file_flush ();
3769 event_ptid = linux_wait_1 (ptid, ourstatus, target_options);
3771 while ((target_options & TARGET_WNOHANG) == 0
3772 && ptid_equal (event_ptid, null_ptid)
3773 && ourstatus->kind == TARGET_WAITKIND_IGNORE);
3775 /* If at least one stop was reported, there may be more. A single
3776 SIGCHLD can signal more than one child stop. */
3777 if (target_is_async_p ()
3778 && (target_options & TARGET_WNOHANG) != 0
3779 && !ptid_equal (event_ptid, null_ptid))
3785 /* Send a signal to an LWP. */
3788 kill_lwp (unsigned long lwpid, int signo)
3793 ret = syscall (__NR_tkill, lwpid, signo);
3794 if (errno == ENOSYS)
3796 /* If tkill fails, then we are not using nptl threads, a
3797 configuration we no longer support. */
3798 perror_with_name (("tkill"));
3804 linux_stop_lwp (struct lwp_info *lwp)
3810 send_sigstop (struct lwp_info *lwp)
3814 pid = lwpid_of (get_lwp_thread (lwp));
3816 /* If we already have a pending stop signal for this process, don't
3818 if (lwp->stop_expected)
3821 debug_printf ("Have pending sigstop for lwp %d\n", pid);
3827 debug_printf ("Sending sigstop to lwp %d\n", pid);
3829 lwp->stop_expected = 1;
3830 kill_lwp (pid, SIGSTOP);
3834 send_sigstop_callback (struct inferior_list_entry *entry, void *except)
3836 struct thread_info *thread = (struct thread_info *) entry;
3837 struct lwp_info *lwp = get_thread_lwp (thread);
3839 /* Ignore EXCEPT. */
3850 /* Increment the suspend count of an LWP, and stop it, if not stopped
3853 suspend_and_send_sigstop_callback (struct inferior_list_entry *entry,
3856 struct thread_info *thread = (struct thread_info *) entry;
3857 struct lwp_info *lwp = get_thread_lwp (thread);
3859 /* Ignore EXCEPT. */
3863 lwp_suspended_inc (lwp);
3865 return send_sigstop_callback (entry, except);
3869 mark_lwp_dead (struct lwp_info *lwp, int wstat)
3871 /* Store the exit status for later. */
3872 lwp->status_pending_p = 1;
3873 lwp->status_pending = wstat;
3875 /* Store in waitstatus as well, as there's nothing else to process
3877 if (WIFEXITED (wstat))
3879 lwp->waitstatus.kind = TARGET_WAITKIND_EXITED;
3880 lwp->waitstatus.value.integer = WEXITSTATUS (wstat);
3882 else if (WIFSIGNALED (wstat))
3884 lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED;
3885 lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat));
3888 /* Prevent trying to stop it. */
3891 /* No further stops are expected from a dead lwp. */
3892 lwp->stop_expected = 0;
3895 /* Return true if LWP has exited already, and has a pending exit event
3896 to report to GDB. */
3899 lwp_is_marked_dead (struct lwp_info *lwp)
3901 return (lwp->status_pending_p
3902 && (WIFEXITED (lwp->status_pending)
3903 || WIFSIGNALED (lwp->status_pending)));
3906 /* Wait for all children to stop for the SIGSTOPs we just queued. */
3909 wait_for_sigstop (void)
3911 struct thread_info *saved_thread;
3916 saved_thread = current_thread;
3917 if (saved_thread != NULL)
3918 saved_tid = saved_thread->entry.id;
3920 saved_tid = null_ptid; /* avoid bogus unused warning */
3923 debug_printf ("wait_for_sigstop: pulling events\n");
3925 /* Passing NULL_PTID as filter indicates we want all events to be
3926 left pending. Eventually this returns when there are no
3927 unwaited-for children left. */
3928 ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid,
3930 gdb_assert (ret == -1);
3932 if (saved_thread == NULL || linux_thread_alive (saved_tid))
3933 current_thread = saved_thread;
3937 debug_printf ("Previously current thread died.\n");
3939 /* We can't change the current inferior behind GDB's back,
3940 otherwise, a subsequent command may apply to the wrong
3942 current_thread = NULL;
3946 /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
3947 move it out, because we need to report the stop event to GDB. For
3948 example, if the user puts a breakpoint in the jump pad, it's
3949 because she wants to debug it. */
3952 stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data)
3954 struct thread_info *thread = (struct thread_info *) entry;
3955 struct lwp_info *lwp = get_thread_lwp (thread);
3957 if (lwp->suspended != 0)
3959 internal_error (__FILE__, __LINE__,
3960 "LWP %ld is suspended, suspended=%d\n",
3961 lwpid_of (thread), lwp->suspended);
3963 gdb_assert (lwp->stopped);
3965 /* Allow debugging the jump pad, gdb_collect, etc.. */
3966 return (supports_fast_tracepoints ()
3967 && agent_loaded_p ()
3968 && (gdb_breakpoint_here (lwp->stop_pc)
3969 || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT
3970 || thread->last_resume_kind == resume_step)
3971 && linux_fast_tracepoint_collecting (lwp, NULL));
3975 move_out_of_jump_pad_callback (struct inferior_list_entry *entry)
3977 struct thread_info *thread = (struct thread_info *) entry;
3978 struct thread_info *saved_thread;
3979 struct lwp_info *lwp = get_thread_lwp (thread);
3982 if (lwp->suspended != 0)
3984 internal_error (__FILE__, __LINE__,
3985 "LWP %ld is suspended, suspended=%d\n",
3986 lwpid_of (thread), lwp->suspended);
3988 gdb_assert (lwp->stopped);
3990 /* For gdb_breakpoint_here. */
3991 saved_thread = current_thread;
3992 current_thread = thread;
3994 wstat = lwp->status_pending_p ? &lwp->status_pending : NULL;
3996 /* Allow debugging the jump pad, gdb_collect, etc. */
3997 if (!gdb_breakpoint_here (lwp->stop_pc)
3998 && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT
3999 && thread->last_resume_kind != resume_step
4000 && maybe_move_out_of_jump_pad (lwp, wstat))
4003 debug_printf ("LWP %ld needs stabilizing (in jump pad)\n",
4008 lwp->status_pending_p = 0;
4009 enqueue_one_deferred_signal (lwp, wstat);
4012 debug_printf ("Signal %d for LWP %ld deferred "
4014 WSTOPSIG (*wstat), lwpid_of (thread));
4017 linux_resume_one_lwp (lwp, 0, 0, NULL);
4020 lwp_suspended_inc (lwp);
4022 current_thread = saved_thread;
4026 lwp_running (struct inferior_list_entry *entry, void *data)
4028 struct thread_info *thread = (struct thread_info *) entry;
4029 struct lwp_info *lwp = get_thread_lwp (thread);
4031 if (lwp_is_marked_dead (lwp))
4038 /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
4039 If SUSPEND, then also increase the suspend count of every LWP,
4043 stop_all_lwps (int suspend, struct lwp_info *except)
4045 /* Should not be called recursively. */
4046 gdb_assert (stopping_threads == NOT_STOPPING_THREADS);
4051 debug_printf ("stop_all_lwps (%s, except=%s)\n",
4052 suspend ? "stop-and-suspend" : "stop",
4054 ? target_pid_to_str (ptid_of (get_lwp_thread (except)))
4058 stopping_threads = (suspend
4059 ? STOPPING_AND_SUSPENDING_THREADS
4060 : STOPPING_THREADS);
4063 find_inferior (&all_threads, suspend_and_send_sigstop_callback, except);
4065 find_inferior (&all_threads, send_sigstop_callback, except);
4066 wait_for_sigstop ();
4067 stopping_threads = NOT_STOPPING_THREADS;
4071 debug_printf ("stop_all_lwps done, setting stopping_threads "
4072 "back to !stopping\n");
4077 /* Enqueue one signal in the chain of signals which need to be
4078 delivered to this process on next resume. */
4081 enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info)
4083 struct pending_signals *p_sig = XNEW (struct pending_signals);
4085 p_sig->prev = lwp->pending_signals;
4086 p_sig->signal = signal;
4088 memset (&p_sig->info, 0, sizeof (siginfo_t));
4090 memcpy (&p_sig->info, info, sizeof (siginfo_t));
4091 lwp->pending_signals = p_sig;
4094 /* Install breakpoints for software single stepping. */
4097 install_software_single_step_breakpoints (struct lwp_info *lwp)
4101 struct regcache *regcache = get_thread_regcache (current_thread, 1);
4102 VEC (CORE_ADDR) *next_pcs = NULL;
4103 struct cleanup *old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
4106 next_pcs = (*the_low_target.get_next_pcs) (pc, regcache);
4108 for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i)
4109 set_reinsert_breakpoint (pc);
4111 do_cleanups (old_chain);
4114 /* Single step via hardware or software single step.
4115 Return 1 if hardware single stepping, 0 if software single stepping
4116 or can't single step. */
4119 single_step (struct lwp_info* lwp)
4123 if (can_hardware_single_step ())
4127 else if (can_software_single_step ())
4129 install_software_single_step_breakpoints (lwp);
4135 debug_printf ("stepping is not implemented on this target");
4141 /* Resume execution of LWP. If STEP is nonzero, single-step it. If
4142 SIGNAL is nonzero, give it that signal. */
4145 linux_resume_one_lwp_throw (struct lwp_info *lwp,
4146 int step, int signal, siginfo_t *info)
4148 struct thread_info *thread = get_lwp_thread (lwp);
4149 struct thread_info *saved_thread;
4150 int fast_tp_collecting;
4152 struct process_info *proc = get_thread_process (thread);
4154 /* Note that target description may not be initialised
4155 (proc->tdesc == NULL) at this point because the program hasn't
4156 stopped at the first instruction yet. It means GDBserver skips
4157 the extra traps from the wrapper program (see option --wrapper).
4158 Code in this function that requires register access should be
4159 guarded by proc->tdesc == NULL or something else. */
4161 if (lwp->stopped == 0)
4164 gdb_assert (lwp->waitstatus.kind == TARGET_WAITKIND_IGNORE);
4166 fast_tp_collecting = lwp->collecting_fast_tracepoint;
4168 gdb_assert (!stabilizing_threads || fast_tp_collecting);
4170 /* Cancel actions that rely on GDB not changing the PC (e.g., the
4171 user used the "jump" command, or "set $pc = foo"). */
4172 if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp))
4174 /* Collecting 'while-stepping' actions doesn't make sense
4176 release_while_stepping_state_list (thread);
4179 /* If we have pending signals or status, and a new signal, enqueue the
4180 signal. Also enqueue the signal if we are waiting to reinsert a
4181 breakpoint; it will be picked up again below. */
4183 && (lwp->status_pending_p
4184 || lwp->pending_signals != NULL
4185 || lwp->bp_reinsert != 0
4186 || fast_tp_collecting))
4188 struct pending_signals *p_sig = XNEW (struct pending_signals);
4190 p_sig->prev = lwp->pending_signals;
4191 p_sig->signal = signal;
4193 memset (&p_sig->info, 0, sizeof (siginfo_t));
4195 memcpy (&p_sig->info, info, sizeof (siginfo_t));
4196 lwp->pending_signals = p_sig;
4199 if (lwp->status_pending_p)
4202 debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);"
4203 " has pending status\n",
4204 lwpid_of (thread), step ? "step" : "continue", signal,
4205 lwp->stop_expected ? "expected" : "not expected");
4209 saved_thread = current_thread;
4210 current_thread = thread;
4213 debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n",
4214 lwpid_of (thread), step ? "step" : "continue", signal,
4215 lwp->stop_expected ? "expected" : "not expected");
4217 /* This bit needs some thinking about. If we get a signal that
4218 we must report while a single-step reinsert is still pending,
4219 we often end up resuming the thread. It might be better to
4220 (ew) allow a stack of pending events; then we could be sure that
4221 the reinsert happened right away and not lose any signals.
4223 Making this stack would also shrink the window in which breakpoints are
4224 uninserted (see comment in linux_wait_for_lwp) but not enough for
4225 complete correctness, so it won't solve that problem. It may be
4226 worthwhile just to solve this one, however. */
4227 if (lwp->bp_reinsert != 0)
4230 debug_printf (" pending reinsert at 0x%s\n",
4231 paddress (lwp->bp_reinsert));
4233 if (can_hardware_single_step ())
4235 if (fast_tp_collecting == 0)
4238 fprintf (stderr, "BAD - reinserting but not stepping.\n");
4240 fprintf (stderr, "BAD - reinserting and suspended(%d).\n",
4247 /* Postpone any pending signal. It was enqueued above. */
4251 if (fast_tp_collecting == 1)
4254 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4255 " (exit-jump-pad-bkpt)\n",
4258 /* Postpone any pending signal. It was enqueued above. */
4261 else if (fast_tp_collecting == 2)
4264 debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad"
4265 " single-stepping\n",
4268 if (can_hardware_single_step ())
4272 internal_error (__FILE__, __LINE__,
4273 "moving out of jump pad single-stepping"
4274 " not implemented on this target");
4277 /* Postpone any pending signal. It was enqueued above. */
4281 /* If we have while-stepping actions in this thread set it stepping.
4282 If we have a signal to deliver, it may or may not be set to
4283 SIG_IGN, we don't know. Assume so, and allow collecting
4284 while-stepping into a signal handler. A possible smart thing to
4285 do would be to set an internal breakpoint at the signal return
4286 address, continue, and carry on catching this while-stepping
4287 action only when that breakpoint is hit. A future
4289 if (thread->while_stepping != NULL)
4292 debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n",
4295 step = single_step (lwp);
4298 if (proc->tdesc != NULL && the_low_target.get_pc != NULL)
4300 struct regcache *regcache = get_thread_regcache (current_thread, 1);
4302 lwp->stop_pc = (*the_low_target.get_pc) (regcache);
4306 debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue",
4307 (long) lwp->stop_pc);
4311 /* If we have pending signals, consume one unless we are trying to
4312 reinsert a breakpoint or we're trying to finish a fast tracepoint
4314 if (lwp->pending_signals != NULL
4315 && lwp->bp_reinsert == 0
4316 && fast_tp_collecting == 0)
4318 struct pending_signals **p_sig;
4320 p_sig = &lwp->pending_signals;
4321 while ((*p_sig)->prev != NULL)
4322 p_sig = &(*p_sig)->prev;
4324 signal = (*p_sig)->signal;
4325 if ((*p_sig)->info.si_signo != 0)
4326 ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0,
4333 if (the_low_target.prepare_to_resume != NULL)
4334 the_low_target.prepare_to_resume (lwp);
4336 regcache_invalidate_thread (thread);
4338 lwp->stepping = step;
4340 ptrace_request = PTRACE_SINGLESTEP;
4341 else if (gdb_catching_syscalls_p (lwp))
4342 ptrace_request = PTRACE_SYSCALL;
4344 ptrace_request = PTRACE_CONT;
4345 ptrace (ptrace_request,
4347 (PTRACE_TYPE_ARG3) 0,
4348 /* Coerce to a uintptr_t first to avoid potential gcc warning
4349 of coercing an 8 byte integer to a 4 byte pointer. */
4350 (PTRACE_TYPE_ARG4) (uintptr_t) signal);
4352 current_thread = saved_thread;
4354 perror_with_name ("resuming thread");
4356 /* Successfully resumed. Clear state that no longer makes sense,
4357 and mark the LWP as running. Must not do this before resuming
4358 otherwise if that fails other code will be confused. E.g., we'd
4359 later try to stop the LWP and hang forever waiting for a stop
4360 status. Note that we must not throw after this is cleared,
4361 otherwise handle_zombie_lwp_error would get confused. */
4363 lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON;
4366 /* Called when we try to resume a stopped LWP and that errors out. If
4367 the LWP is no longer in ptrace-stopped state (meaning it's zombie,
4368 or about to become), discard the error, clear any pending status
4369 the LWP may have, and return true (we'll collect the exit status
4370 soon enough). Otherwise, return false. */
4373 check_ptrace_stopped_lwp_gone (struct lwp_info *lp)
4375 struct thread_info *thread = get_lwp_thread (lp);
4377 /* If we get an error after resuming the LWP successfully, we'd
4378 confuse !T state for the LWP being gone. */
4379 gdb_assert (lp->stopped);
4381 /* We can't just check whether the LWP is in 'Z (Zombie)' state,
4382 because even if ptrace failed with ESRCH, the tracee may be "not
4383 yet fully dead", but already refusing ptrace requests. In that
4384 case the tracee has 'R (Running)' state for a little bit
4385 (observed in Linux 3.18). See also the note on ESRCH in the
4386 ptrace(2) man page. Instead, check whether the LWP has any state
4387 other than ptrace-stopped. */
4389 /* Don't assume anything if /proc/PID/status can't be read. */
4390 if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0)
4392 lp->stop_reason = TARGET_STOPPED_BY_NO_REASON;
4393 lp->status_pending_p = 0;
4399 /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP
4400 disappears while we try to resume it. */
4403 linux_resume_one_lwp (struct lwp_info *lwp,
4404 int step, int signal, siginfo_t *info)
4408 linux_resume_one_lwp_throw (lwp, step, signal, info);
4410 CATCH (ex, RETURN_MASK_ERROR)
4412 if (!check_ptrace_stopped_lwp_gone (lwp))
4413 throw_exception (ex);
4418 struct thread_resume_array
4420 struct thread_resume *resume;
4424 /* This function is called once per thread via find_inferior.
4425 ARG is a pointer to a thread_resume_array struct.
4426 We look up the thread specified by ENTRY in ARG, and mark the thread
4427 with a pointer to the appropriate resume request.
4429 This algorithm is O(threads * resume elements), but resume elements
4430 is small (and will remain small at least until GDB supports thread
4434 linux_set_resume_request (struct inferior_list_entry *entry, void *arg)
4436 struct thread_info *thread = (struct thread_info *) entry;
4437 struct lwp_info *lwp = get_thread_lwp (thread);
4439 struct thread_resume_array *r;
4441 r = (struct thread_resume_array *) arg;
4443 for (ndx = 0; ndx < r->n; ndx++)
4445 ptid_t ptid = r->resume[ndx].thread;
4446 if (ptid_equal (ptid, minus_one_ptid)
4447 || ptid_equal (ptid, entry->id)
4448 /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads
4450 || (ptid_get_pid (ptid) == pid_of (thread)
4451 && (ptid_is_pid (ptid)
4452 || ptid_get_lwp (ptid) == -1)))
4454 if (r->resume[ndx].kind == resume_stop
4455 && thread->last_resume_kind == resume_stop)
4458 debug_printf ("already %s LWP %ld at GDB's request\n",
4459 (thread->last_status.kind
4460 == TARGET_WAITKIND_STOPPED)
4468 lwp->resume = &r->resume[ndx];
4469 thread->last_resume_kind = lwp->resume->kind;
4471 lwp->step_range_start = lwp->resume->step_range_start;
4472 lwp->step_range_end = lwp->resume->step_range_end;
4474 /* If we had a deferred signal to report, dequeue one now.
4475 This can happen if LWP gets more than one signal while
4476 trying to get out of a jump pad. */
4478 && !lwp->status_pending_p
4479 && dequeue_one_deferred_signal (lwp, &lwp->status_pending))
4481 lwp->status_pending_p = 1;
4484 debug_printf ("Dequeueing deferred signal %d for LWP %ld, "
4485 "leaving status pending.\n",
4486 WSTOPSIG (lwp->status_pending),
4494 /* No resume action for this thread. */
4500 /* find_inferior callback for linux_resume.
4501 Set *FLAG_P if this lwp has an interesting status pending. */
4504 resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
4506 struct thread_info *thread = (struct thread_info *) entry;
4507 struct lwp_info *lwp = get_thread_lwp (thread);
4509 /* LWPs which will not be resumed are not interesting, because
4510 we might not wait for them next time through linux_wait. */
4511 if (lwp->resume == NULL)
4514 if (thread_still_has_status_pending_p (thread))
4515 * (int *) flag_p = 1;
4520 /* Return 1 if this lwp that GDB wants running is stopped at an
4521 internal breakpoint that we need to step over. It assumes that any
4522 required STOP_PC adjustment has already been propagated to the
4523 inferior's regcache. */
4526 need_step_over_p (struct inferior_list_entry *entry, void *dummy)
4528 struct thread_info *thread = (struct thread_info *) entry;
4529 struct lwp_info *lwp = get_thread_lwp (thread);
4530 struct thread_info *saved_thread;
4532 struct process_info *proc = get_thread_process (thread);
4534 /* GDBserver is skipping the extra traps from the wrapper program,
4535 don't have to do step over. */
4536 if (proc->tdesc == NULL)
4539 /* LWPs which will not be resumed are not interesting, because we
4540 might not wait for them next time through linux_wait. */
4545 debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n",
4550 if (thread->last_resume_kind == resume_stop)
4553 debug_printf ("Need step over [LWP %ld]? Ignoring, should remain"
4559 gdb_assert (lwp->suspended >= 0);
4564 debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n",
4569 if (!lwp->need_step_over)
4572 debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread));
4575 if (lwp->status_pending_p)
4578 debug_printf ("Need step over [LWP %ld]? Ignoring, has pending"
4584 /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already,
4588 /* If the PC has changed since we stopped, then don't do anything,
4589 and let the breakpoint/tracepoint be hit. This happens if, for
4590 instance, GDB handled the decr_pc_after_break subtraction itself,
4591 GDB is OOL stepping this thread, or the user has issued a "jump"
4592 command, or poked thread's registers herself. */
4593 if (pc != lwp->stop_pc)
4596 debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. "
4597 "Old stop_pc was 0x%s, PC is now 0x%s\n",
4599 paddress (lwp->stop_pc), paddress (pc));
4601 lwp->need_step_over = 0;
4605 saved_thread = current_thread;
4606 current_thread = thread;
4608 /* We can only step over breakpoints we know about. */
4609 if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc))
4611 /* Don't step over a breakpoint that GDB expects to hit
4612 though. If the condition is being evaluated on the target's side
4613 and it evaluate to false, step over this breakpoint as well. */
4614 if (gdb_breakpoint_here (pc)
4615 && gdb_condition_true_at_breakpoint (pc)
4616 && gdb_no_commands_at_breakpoint (pc))
4619 debug_printf ("Need step over [LWP %ld]? yes, but found"
4620 " GDB breakpoint at 0x%s; skipping step over\n",
4621 lwpid_of (thread), paddress (pc));
4623 current_thread = saved_thread;
4629 debug_printf ("Need step over [LWP %ld]? yes, "
4630 "found breakpoint at 0x%s\n",
4631 lwpid_of (thread), paddress (pc));
4633 /* We've found an lwp that needs stepping over --- return 1 so
4634 that find_inferior stops looking. */
4635 current_thread = saved_thread;
4637 /* If the step over is cancelled, this is set again. */
4638 lwp->need_step_over = 0;
4643 current_thread = saved_thread;
4646 debug_printf ("Need step over [LWP %ld]? No, no breakpoint found"
4648 lwpid_of (thread), paddress (pc));
4653 /* Start a step-over operation on LWP. When LWP stopped at a
4654 breakpoint, to make progress, we need to remove the breakpoint out
4655 of the way. If we let other threads run while we do that, they may
4656 pass by the breakpoint location and miss hitting it. To avoid
4657 that, a step-over momentarily stops all threads while LWP is
4658 single-stepped while the breakpoint is temporarily uninserted from
4659 the inferior. When the single-step finishes, we reinsert the
4660 breakpoint, and let all threads that are supposed to be running,
4663 On targets that don't support hardware single-step, we don't
4664 currently support full software single-stepping. Instead, we only
4665 support stepping over the thread event breakpoint, by asking the
4666 low target where to place a reinsert breakpoint. Since this
4667 routine assumes the breakpoint being stepped over is a thread event
4668 breakpoint, it usually assumes the return address of the current
4669 function is a good enough place to set the reinsert breakpoint. */
4672 start_step_over (struct lwp_info *lwp)
4674 struct thread_info *thread = get_lwp_thread (lwp);
4675 struct thread_info *saved_thread;
4680 debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n",
4683 stop_all_lwps (1, lwp);
4685 if (lwp->suspended != 0)
4687 internal_error (__FILE__, __LINE__,
4688 "LWP %ld suspended=%d\n", lwpid_of (thread),
4693 debug_printf ("Done stopping all threads for step-over.\n");
4695 /* Note, we should always reach here with an already adjusted PC,
4696 either by GDB (if we're resuming due to GDB's request), or by our
4697 caller, if we just finished handling an internal breakpoint GDB
4698 shouldn't care about. */
4701 saved_thread = current_thread;
4702 current_thread = thread;
4704 lwp->bp_reinsert = pc;
4705 uninsert_breakpoints_at (pc);
4706 uninsert_fast_tracepoint_jumps_at (pc);
4708 step = single_step (lwp);
4710 current_thread = saved_thread;
4712 linux_resume_one_lwp (lwp, step, 0, NULL);
4714 /* Require next event from this LWP. */
4715 step_over_bkpt = thread->entry.id;
4719 /* Finish a step-over. Reinsert the breakpoint we had uninserted in
4720 start_step_over, if still there, and delete any reinsert
4721 breakpoints we've set, on non hardware single-step targets. */
4724 finish_step_over (struct lwp_info *lwp)
4726 if (lwp->bp_reinsert != 0)
4729 debug_printf ("Finished step over.\n");
4731 /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
4732 may be no breakpoint to reinsert there by now. */
4733 reinsert_breakpoints_at (lwp->bp_reinsert);
4734 reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert);
4736 lwp->bp_reinsert = 0;
4738 /* Delete any software-single-step reinsert breakpoints. No
4739 longer needed. We don't have to worry about other threads
4740 hitting this trap, and later not being able to explain it,
4741 because we were stepping over a breakpoint, and we hold all
4742 threads but LWP stopped while doing that. */
4743 if (!can_hardware_single_step ())
4744 delete_reinsert_breakpoints ();
4746 step_over_bkpt = null_ptid;
4753 /* If there's a step over in progress, wait until all threads stop
4754 (that is, until the stepping thread finishes its step), and
4755 unsuspend all lwps. The stepping thread ends with its status
4756 pending, which is processed later when we get back to processing
4760 complete_ongoing_step_over (void)
4762 if (!ptid_equal (step_over_bkpt, null_ptid))
4764 struct lwp_info *lwp;
4769 debug_printf ("detach: step over in progress, finish it first\n");
4771 /* Passing NULL_PTID as filter indicates we want all events to
4772 be left pending. Eventually this returns when there are no
4773 unwaited-for children left. */
4774 ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid,
4776 gdb_assert (ret == -1);
4778 lwp = find_lwp_pid (step_over_bkpt);
4780 finish_step_over (lwp);
4781 step_over_bkpt = null_ptid;
4782 unsuspend_all_lwps (lwp);
4786 /* This function is called once per thread. We check the thread's resume
4787 request, which will tell us whether to resume, step, or leave the thread
4788 stopped; and what signal, if any, it should be sent.
4790 For threads which we aren't explicitly told otherwise, we preserve
4791 the stepping flag; this is used for stepping over gdbserver-placed
4794 If pending_flags was set in any thread, we queue any needed
4795 signals, since we won't actually resume. We already have a pending
4796 event to report, so we don't need to preserve any step requests;
4797 they should be re-issued if necessary. */
4800 linux_resume_one_thread (struct inferior_list_entry *entry, void *arg)
4802 struct thread_info *thread = (struct thread_info *) entry;
4803 struct lwp_info *lwp = get_thread_lwp (thread);
4805 int leave_all_stopped = * (int *) arg;
4808 if (lwp->resume == NULL)
4811 if (lwp->resume->kind == resume_stop)
4814 debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread));
4819 debug_printf ("stopping LWP %ld\n", lwpid_of (thread));
4821 /* Stop the thread, and wait for the event asynchronously,
4822 through the event loop. */
4828 debug_printf ("already stopped LWP %ld\n",
4831 /* The LWP may have been stopped in an internal event that
4832 was not meant to be notified back to GDB (e.g., gdbserver
4833 breakpoint), so we should be reporting a stop event in
4836 /* If the thread already has a pending SIGSTOP, this is a
4837 no-op. Otherwise, something later will presumably resume
4838 the thread and this will cause it to cancel any pending
4839 operation, due to last_resume_kind == resume_stop. If
4840 the thread already has a pending status to report, we
4841 will still report it the next time we wait - see
4842 status_pending_p_callback. */
4844 /* If we already have a pending signal to report, then
4845 there's no need to queue a SIGSTOP, as this means we're
4846 midway through moving the LWP out of the jumppad, and we
4847 will report the pending signal as soon as that is
4849 if (lwp->pending_signals_to_report == NULL)
4853 /* For stop requests, we're done. */
4855 thread->last_status.kind = TARGET_WAITKIND_IGNORE;
4859 /* If this thread which is about to be resumed has a pending status,
4860 then don't resume it - we can just report the pending status.
4861 Likewise if it is suspended, because e.g., another thread is
4862 stepping past a breakpoint. Make sure to queue any signals that
4863 would otherwise be sent. In all-stop mode, we do this decision
4864 based on if *any* thread has a pending status. If there's a
4865 thread that needs the step-over-breakpoint dance, then don't
4866 resume any other thread but that particular one. */
4867 leave_pending = (lwp->suspended
4868 || lwp->status_pending_p
4869 || leave_all_stopped);
4874 debug_printf ("resuming LWP %ld\n", lwpid_of (thread));
4876 step = (lwp->resume->kind == resume_step);
4877 linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL);
4882 debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread));
4884 /* If we have a new signal, enqueue the signal. */
4885 if (lwp->resume->sig != 0)
4887 struct pending_signals *p_sig = XCNEW (struct pending_signals);
4889 p_sig->prev = lwp->pending_signals;
4890 p_sig->signal = lwp->resume->sig;
4892 /* If this is the same signal we were previously stopped by,
4893 make sure to queue its siginfo. We can ignore the return
4894 value of ptrace; if it fails, we'll skip
4895 PTRACE_SETSIGINFO. */
4896 if (WIFSTOPPED (lwp->last_status)
4897 && WSTOPSIG (lwp->last_status) == lwp->resume->sig)
4898 ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0,
4901 lwp->pending_signals = p_sig;
4905 thread->last_status.kind = TARGET_WAITKIND_IGNORE;
4911 linux_resume (struct thread_resume *resume_info, size_t n)
4913 struct thread_resume_array array = { resume_info, n };
4914 struct thread_info *need_step_over = NULL;
4916 int leave_all_stopped;
4921 debug_printf ("linux_resume:\n");
4924 find_inferior (&all_threads, linux_set_resume_request, &array);
4926 /* If there is a thread which would otherwise be resumed, which has
4927 a pending status, then don't resume any threads - we can just
4928 report the pending status. Make sure to queue any signals that
4929 would otherwise be sent. In non-stop mode, we'll apply this
4930 logic to each thread individually. We consume all pending events
4931 before considering to start a step-over (in all-stop). */
4934 find_inferior (&all_threads, resume_status_pending_p, &any_pending);
4936 /* If there is a thread which would otherwise be resumed, which is
4937 stopped at a breakpoint that needs stepping over, then don't
4938 resume any threads - have it step over the breakpoint with all
4939 other threads stopped, then resume all threads again. Make sure
4940 to queue any signals that would otherwise be delivered or
4942 if (!any_pending && supports_breakpoints ())
4944 = (struct thread_info *) find_inferior (&all_threads,
4945 need_step_over_p, NULL);
4947 leave_all_stopped = (need_step_over != NULL || any_pending);
4951 if (need_step_over != NULL)
4952 debug_printf ("Not resuming all, need step over\n");
4953 else if (any_pending)
4954 debug_printf ("Not resuming, all-stop and found "
4955 "an LWP with pending status\n");
4957 debug_printf ("Resuming, no pending status or step over needed\n");
4960 /* Even if we're leaving threads stopped, queue all signals we'd
4961 otherwise deliver. */
4962 find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped);
4965 start_step_over (get_thread_lwp (need_step_over));
4969 debug_printf ("linux_resume done\n");
4973 /* We may have events that were pending that can/should be sent to
4974 the client now. Trigger a linux_wait call. */
4975 if (target_is_async_p ())
4979 /* This function is called once per thread. We check the thread's
4980 last resume request, which will tell us whether to resume, step, or
4981 leave the thread stopped. Any signal the client requested to be
4982 delivered has already been enqueued at this point.
4984 If any thread that GDB wants running is stopped at an internal
4985 breakpoint that needs stepping over, we start a step-over operation
4986 on that particular thread, and leave all others stopped. */
4989 proceed_one_lwp (struct inferior_list_entry *entry, void *except)
4991 struct thread_info *thread = (struct thread_info *) entry;
4992 struct lwp_info *lwp = get_thread_lwp (thread);
4999 debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread));
5004 debug_printf (" LWP %ld already running\n", lwpid_of (thread));
5008 if (thread->last_resume_kind == resume_stop
5009 && thread->last_status.kind != TARGET_WAITKIND_IGNORE)
5012 debug_printf (" client wants LWP to remain %ld stopped\n",
5017 if (lwp->status_pending_p)
5020 debug_printf (" LWP %ld has pending status, leaving stopped\n",
5025 gdb_assert (lwp->suspended >= 0);
5030 debug_printf (" LWP %ld is suspended\n", lwpid_of (thread));
5034 if (thread->last_resume_kind == resume_stop
5035 && lwp->pending_signals_to_report == NULL
5036 && lwp->collecting_fast_tracepoint == 0)
5038 /* We haven't reported this LWP as stopped yet (otherwise, the
5039 last_status.kind check above would catch it, and we wouldn't
5040 reach here. This LWP may have been momentarily paused by a
5041 stop_all_lwps call while handling for example, another LWP's
5042 step-over. In that case, the pending expected SIGSTOP signal
5043 that was queued at vCont;t handling time will have already
5044 been consumed by wait_for_sigstop, and so we need to requeue
5045 another one here. Note that if the LWP already has a SIGSTOP
5046 pending, this is a no-op. */
5049 debug_printf ("Client wants LWP %ld to stop. "
5050 "Making sure it has a SIGSTOP pending\n",
5056 if (thread->last_resume_kind == resume_step)
5059 debug_printf (" stepping LWP %ld, client wants it stepping\n",
5063 else if (lwp->bp_reinsert != 0)
5066 debug_printf (" stepping LWP %ld, reinsert set\n",
5073 linux_resume_one_lwp (lwp, step, 0, NULL);
5078 unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except)
5080 struct thread_info *thread = (struct thread_info *) entry;
5081 struct lwp_info *lwp = get_thread_lwp (thread);
5086 lwp_suspended_decr (lwp);
5088 return proceed_one_lwp (entry, except);
5091 /* When we finish a step-over, set threads running again. If there's
5092 another thread that may need a step-over, now's the time to start
5093 it. Eventually, we'll move all threads past their breakpoints. */
5096 proceed_all_lwps (void)
5098 struct thread_info *need_step_over;
5100 /* If there is a thread which would otherwise be resumed, which is
5101 stopped at a breakpoint that needs stepping over, then don't
5102 resume any threads - have it step over the breakpoint with all
5103 other threads stopped, then resume all threads again. */
5105 if (supports_breakpoints ())
5108 = (struct thread_info *) find_inferior (&all_threads,
5109 need_step_over_p, NULL);
5111 if (need_step_over != NULL)
5114 debug_printf ("proceed_all_lwps: found "
5115 "thread %ld needing a step-over\n",
5116 lwpid_of (need_step_over));
5118 start_step_over (get_thread_lwp (need_step_over));
5124 debug_printf ("Proceeding, no step-over needed\n");
5126 find_inferior (&all_threads, proceed_one_lwp, NULL);
5129 /* Stopped LWPs that the client wanted to be running, that don't have
5130 pending statuses, are set to run again, except for EXCEPT, if not
5131 NULL. This undoes a stop_all_lwps call. */
5134 unstop_all_lwps (int unsuspend, struct lwp_info *except)
5140 debug_printf ("unstopping all lwps, except=(LWP %ld)\n",
5141 lwpid_of (get_lwp_thread (except)));
5143 debug_printf ("unstopping all lwps\n");
5147 find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except);
5149 find_inferior (&all_threads, proceed_one_lwp, except);
5153 debug_printf ("unstop_all_lwps done\n");
5159 #ifdef HAVE_LINUX_REGSETS
5161 #define use_linux_regsets 1
5163 /* Returns true if REGSET has been disabled. */
5166 regset_disabled (struct regsets_info *info, struct regset_info *regset)
5168 return (info->disabled_regsets != NULL
5169 && info->disabled_regsets[regset - info->regsets]);
5172 /* Disable REGSET. */
5175 disable_regset (struct regsets_info *info, struct regset_info *regset)
5179 dr_offset = regset - info->regsets;
5180 if (info->disabled_regsets == NULL)
5181 info->disabled_regsets = (char *) xcalloc (1, info->num_regsets);
5182 info->disabled_regsets[dr_offset] = 1;
5186 regsets_fetch_inferior_registers (struct regsets_info *regsets_info,
5187 struct regcache *regcache)
5189 struct regset_info *regset;
5190 int saw_general_regs = 0;
5194 pid = lwpid_of (current_thread);
5195 for (regset = regsets_info->regsets; regset->size >= 0; regset++)
5200 if (regset->size == 0 || regset_disabled (regsets_info, regset))
5203 buf = xmalloc (regset->size);
5205 nt_type = regset->nt_type;
5209 iov.iov_len = regset->size;
5210 data = (void *) &iov;
5216 res = ptrace (regset->get_request, pid,
5217 (PTRACE_TYPE_ARG3) (long) nt_type, data);
5219 res = ptrace (regset->get_request, pid, data, nt_type);
5225 /* If we get EIO on a regset, do not try it again for
5226 this process mode. */
5227 disable_regset (regsets_info, regset);
5229 else if (errno == ENODATA)
5231 /* ENODATA may be returned if the regset is currently
5232 not "active". This can happen in normal operation,
5233 so suppress the warning in this case. */
5238 sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d",
5245 if (regset->type == GENERAL_REGS)
5246 saw_general_regs = 1;
5247 regset->store_function (regcache, buf);
5251 if (saw_general_regs)
5258 regsets_store_inferior_registers (struct regsets_info *regsets_info,
5259 struct regcache *regcache)
5261 struct regset_info *regset;
5262 int saw_general_regs = 0;
5266 pid = lwpid_of (current_thread);
5267 for (regset = regsets_info->regsets; regset->size >= 0; regset++)
5272 if (regset->size == 0 || regset_disabled (regsets_info, regset)
5273 || regset->fill_function == NULL)
5276 buf = xmalloc (regset->size);
5278 /* First fill the buffer with the current register set contents,
5279 in case there are any items in the kernel's regset that are
5280 not in gdbserver's regcache. */
5282 nt_type = regset->nt_type;
5286 iov.iov_len = regset->size;
5287 data = (void *) &iov;
5293 res = ptrace (regset->get_request, pid,
5294 (PTRACE_TYPE_ARG3) (long) nt_type, data);
5296 res = ptrace (regset->get_request, pid, data, nt_type);
5301 /* Then overlay our cached registers on that. */
5302 regset->fill_function (regcache, buf);
5304 /* Only now do we write the register set. */
5306 res = ptrace (regset->set_request, pid,
5307 (PTRACE_TYPE_ARG3) (long) nt_type, data);
5309 res = ptrace (regset->set_request, pid, data, nt_type);
5317 /* If we get EIO on a regset, do not try it again for
5318 this process mode. */
5319 disable_regset (regsets_info, regset);
5321 else if (errno == ESRCH)
5323 /* At this point, ESRCH should mean the process is
5324 already gone, in which case we simply ignore attempts
5325 to change its registers. See also the related
5326 comment in linux_resume_one_lwp. */
5332 perror ("Warning: ptrace(regsets_store_inferior_registers)");
5335 else if (regset->type == GENERAL_REGS)
5336 saw_general_regs = 1;
5339 if (saw_general_regs)
5345 #else /* !HAVE_LINUX_REGSETS */
5347 #define use_linux_regsets 0
5348 #define regsets_fetch_inferior_registers(regsets_info, regcache) 1
5349 #define regsets_store_inferior_registers(regsets_info, regcache) 1
5353 /* Return 1 if register REGNO is supported by one of the regset ptrace
5354 calls or 0 if it has to be transferred individually. */
5357 linux_register_in_regsets (const struct regs_info *regs_info, int regno)
5359 unsigned char mask = 1 << (regno % 8);
5360 size_t index = regno / 8;
5362 return (use_linux_regsets
5363 && (regs_info->regset_bitmap == NULL
5364 || (regs_info->regset_bitmap[index] & mask) != 0));
5367 #ifdef HAVE_LINUX_USRREGS
5370 register_addr (const struct usrregs_info *usrregs, int regnum)
5374 if (regnum < 0 || regnum >= usrregs->num_regs)
5375 error ("Invalid register number %d.", regnum);
5377 addr = usrregs->regmap[regnum];
5382 /* Fetch one register. */
5384 fetch_register (const struct usrregs_info *usrregs,
5385 struct regcache *regcache, int regno)
5392 if (regno >= usrregs->num_regs)
5394 if ((*the_low_target.cannot_fetch_register) (regno))
5397 regaddr = register_addr (usrregs, regno);
5401 size = ((register_size (regcache->tdesc, regno)
5402 + sizeof (PTRACE_XFER_TYPE) - 1)
5403 & -sizeof (PTRACE_XFER_TYPE));
5404 buf = (char *) alloca (size);
5406 pid = lwpid_of (current_thread);
5407 for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
5410 *(PTRACE_XFER_TYPE *) (buf + i) =
5411 ptrace (PTRACE_PEEKUSER, pid,
5412 /* Coerce to a uintptr_t first to avoid potential gcc warning
5413 of coercing an 8 byte integer to a 4 byte pointer. */
5414 (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0);
5415 regaddr += sizeof (PTRACE_XFER_TYPE);
5417 error ("reading register %d: %s", regno, strerror (errno));
5420 if (the_low_target.supply_ptrace_register)
5421 the_low_target.supply_ptrace_register (regcache, regno, buf);
5423 supply_register (regcache, regno, buf);
5426 /* Store one register. */
5428 store_register (const struct usrregs_info *usrregs,
5429 struct regcache *regcache, int regno)
5436 if (regno >= usrregs->num_regs)
5438 if ((*the_low_target.cannot_store_register) (regno))
5441 regaddr = register_addr (usrregs, regno);
5445 size = ((register_size (regcache->tdesc, regno)
5446 + sizeof (PTRACE_XFER_TYPE) - 1)
5447 & -sizeof (PTRACE_XFER_TYPE));
5448 buf = (char *) alloca (size);
5449 memset (buf, 0, size);
5451 if (the_low_target.collect_ptrace_register)
5452 the_low_target.collect_ptrace_register (regcache, regno, buf);
5454 collect_register (regcache, regno, buf);
5456 pid = lwpid_of (current_thread);
5457 for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
5460 ptrace (PTRACE_POKEUSER, pid,
5461 /* Coerce to a uintptr_t first to avoid potential gcc warning
5462 about coercing an 8 byte integer to a 4 byte pointer. */
5463 (PTRACE_TYPE_ARG3) (uintptr_t) regaddr,
5464 (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i));
5467 /* At this point, ESRCH should mean the process is
5468 already gone, in which case we simply ignore attempts
5469 to change its registers. See also the related
5470 comment in linux_resume_one_lwp. */
5474 if ((*the_low_target.cannot_store_register) (regno) == 0)
5475 error ("writing register %d: %s", regno, strerror (errno));
5477 regaddr += sizeof (PTRACE_XFER_TYPE);
5481 /* Fetch all registers, or just one, from the child process.
5482 If REGNO is -1, do this for all registers, skipping any that are
5483 assumed to have been retrieved by regsets_fetch_inferior_registers,
5484 unless ALL is non-zero.
5485 Otherwise, REGNO specifies which register (so we can save time). */
5487 usr_fetch_inferior_registers (const struct regs_info *regs_info,
5488 struct regcache *regcache, int regno, int all)
5490 struct usrregs_info *usr = regs_info->usrregs;
5494 for (regno = 0; regno < usr->num_regs; regno++)
5495 if (all || !linux_register_in_regsets (regs_info, regno))
5496 fetch_register (usr, regcache, regno);
5499 fetch_register (usr, regcache, regno);
5502 /* Store our register values back into the inferior.
5503 If REGNO is -1, do this for all registers, skipping any that are
5504 assumed to have been saved by regsets_store_inferior_registers,
5505 unless ALL is non-zero.
5506 Otherwise, REGNO specifies which register (so we can save time). */
5508 usr_store_inferior_registers (const struct regs_info *regs_info,
5509 struct regcache *regcache, int regno, int all)
5511 struct usrregs_info *usr = regs_info->usrregs;
5515 for (regno = 0; regno < usr->num_regs; regno++)
5516 if (all || !linux_register_in_regsets (regs_info, regno))
5517 store_register (usr, regcache, regno);
5520 store_register (usr, regcache, regno);
5523 #else /* !HAVE_LINUX_USRREGS */
5525 #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5526 #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0)
5532 linux_fetch_registers (struct regcache *regcache, int regno)
5536 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
5540 if (the_low_target.fetch_register != NULL
5541 && regs_info->usrregs != NULL)
5542 for (regno = 0; regno < regs_info->usrregs->num_regs; regno++)
5543 (*the_low_target.fetch_register) (regcache, regno);
5545 all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache);
5546 if (regs_info->usrregs != NULL)
5547 usr_fetch_inferior_registers (regs_info, regcache, -1, all);
5551 if (the_low_target.fetch_register != NULL
5552 && (*the_low_target.fetch_register) (regcache, regno))
5555 use_regsets = linux_register_in_regsets (regs_info, regno);
5557 all = regsets_fetch_inferior_registers (regs_info->regsets_info,
5559 if ((!use_regsets || all) && regs_info->usrregs != NULL)
5560 usr_fetch_inferior_registers (regs_info, regcache, regno, 1);
5565 linux_store_registers (struct regcache *regcache, int regno)
5569 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
5573 all = regsets_store_inferior_registers (regs_info->regsets_info,
5575 if (regs_info->usrregs != NULL)
5576 usr_store_inferior_registers (regs_info, regcache, regno, all);
5580 use_regsets = linux_register_in_regsets (regs_info, regno);
5582 all = regsets_store_inferior_registers (regs_info->regsets_info,
5584 if ((!use_regsets || all) && regs_info->usrregs != NULL)
5585 usr_store_inferior_registers (regs_info, regcache, regno, 1);
5590 /* Copy LEN bytes from inferior's memory starting at MEMADDR
5591 to debugger memory starting at MYADDR. */
5594 linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
5596 int pid = lwpid_of (current_thread);
5597 register PTRACE_XFER_TYPE *buffer;
5598 register CORE_ADDR addr;
5605 /* Try using /proc. Don't bother for one word. */
5606 if (len >= 3 * sizeof (long))
5610 /* We could keep this file open and cache it - possibly one per
5611 thread. That requires some juggling, but is even faster. */
5612 sprintf (filename, "/proc/%d/mem", pid);
5613 fd = open (filename, O_RDONLY | O_LARGEFILE);
5617 /* If pread64 is available, use it. It's faster if the kernel
5618 supports it (only one syscall), and it's 64-bit safe even on
5619 32-bit platforms (for instance, SPARC debugging a SPARC64
5622 bytes = pread64 (fd, myaddr, len, memaddr);
5625 if (lseek (fd, memaddr, SEEK_SET) != -1)
5626 bytes = read (fd, myaddr, len);
5633 /* Some data was read, we'll try to get the rest with ptrace. */
5643 /* Round starting address down to longword boundary. */
5644 addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
5645 /* Round ending address up; get number of longwords that makes. */
5646 count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
5647 / sizeof (PTRACE_XFER_TYPE));
5648 /* Allocate buffer of that many longwords. */
5649 buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count);
5651 /* Read all the longwords */
5653 for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
5655 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5656 about coercing an 8 byte integer to a 4 byte pointer. */
5657 buffer[i] = ptrace (PTRACE_PEEKTEXT, pid,
5658 (PTRACE_TYPE_ARG3) (uintptr_t) addr,
5659 (PTRACE_TYPE_ARG4) 0);
5665 /* Copy appropriate bytes out of the buffer. */
5668 i *= sizeof (PTRACE_XFER_TYPE);
5669 i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1);
5671 (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
5678 /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
5679 memory at MEMADDR. On failure (cannot write to the inferior)
5680 returns the value of errno. Always succeeds if LEN is zero. */
5683 linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
5686 /* Round starting address down to longword boundary. */
5687 register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
5688 /* Round ending address up; get number of longwords that makes. */
5690 = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
5691 / sizeof (PTRACE_XFER_TYPE);
5693 /* Allocate buffer of that many longwords. */
5694 register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count);
5696 int pid = lwpid_of (current_thread);
5700 /* Zero length write always succeeds. */
5706 /* Dump up to four bytes. */
5707 char str[4 * 2 + 1];
5709 int dump = len < 4 ? len : 4;
5711 for (i = 0; i < dump; i++)
5713 sprintf (p, "%02x", myaddr[i]);
5718 debug_printf ("Writing %s to 0x%08lx in process %d\n",
5719 str, (long) memaddr, pid);
5722 /* Fill start and end extra bytes of buffer with existing memory data. */
5725 /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
5726 about coercing an 8 byte integer to a 4 byte pointer. */
5727 buffer[0] = ptrace (PTRACE_PEEKTEXT, pid,
5728 (PTRACE_TYPE_ARG3) (uintptr_t) addr,
5729 (PTRACE_TYPE_ARG4) 0);
5737 = ptrace (PTRACE_PEEKTEXT, pid,
5738 /* Coerce to a uintptr_t first to avoid potential gcc warning
5739 about coercing an 8 byte integer to a 4 byte pointer. */
5740 (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1)
5741 * sizeof (PTRACE_XFER_TYPE)),
5742 (PTRACE_TYPE_ARG4) 0);
5747 /* Copy data to be written over corresponding part of buffer. */
5749 memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
5752 /* Write the entire buffer. */
5754 for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
5757 ptrace (PTRACE_POKETEXT, pid,
5758 /* Coerce to a uintptr_t first to avoid potential gcc warning
5759 about coercing an 8 byte integer to a 4 byte pointer. */
5760 (PTRACE_TYPE_ARG3) (uintptr_t) addr,
5761 (PTRACE_TYPE_ARG4) buffer[i]);
5770 linux_look_up_symbols (void)
5772 #ifdef USE_THREAD_DB
5773 struct process_info *proc = current_process ();
5775 if (proc->priv->thread_db != NULL)
5783 linux_request_interrupt (void)
5785 extern unsigned long signal_pid;
5787 /* Send a SIGINT to the process group. This acts just like the user
5788 typed a ^C on the controlling terminal. */
5789 kill (-signal_pid, SIGINT);
5792 /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
5793 to debugger memory starting at MYADDR. */
5796 linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len)
5798 char filename[PATH_MAX];
5800 int pid = lwpid_of (current_thread);
5802 xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
5804 fd = open (filename, O_RDONLY);
5808 if (offset != (CORE_ADDR) 0
5809 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
5812 n = read (fd, myaddr, len);
5819 /* These breakpoint and watchpoint related wrapper functions simply
5820 pass on the function call if the target has registered a
5821 corresponding function. */
5824 linux_supports_z_point_type (char z_type)
5826 return (the_low_target.supports_z_point_type != NULL
5827 && the_low_target.supports_z_point_type (z_type));
5831 linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
5832 int size, struct raw_breakpoint *bp)
5834 if (type == raw_bkpt_type_sw)
5835 return insert_memory_breakpoint (bp);
5836 else if (the_low_target.insert_point != NULL)
5837 return the_low_target.insert_point (type, addr, size, bp);
5839 /* Unsupported (see target.h). */
5844 linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
5845 int size, struct raw_breakpoint *bp)
5847 if (type == raw_bkpt_type_sw)
5848 return remove_memory_breakpoint (bp);
5849 else if (the_low_target.remove_point != NULL)
5850 return the_low_target.remove_point (type, addr, size, bp);
5852 /* Unsupported (see target.h). */
5856 /* Implement the to_stopped_by_sw_breakpoint target_ops
5860 linux_stopped_by_sw_breakpoint (void)
5862 struct lwp_info *lwp = get_thread_lwp (current_thread);
5864 return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT);
5867 /* Implement the to_supports_stopped_by_sw_breakpoint target_ops
5871 linux_supports_stopped_by_sw_breakpoint (void)
5873 return USE_SIGTRAP_SIGINFO;
5876 /* Implement the to_stopped_by_hw_breakpoint target_ops
5880 linux_stopped_by_hw_breakpoint (void)
5882 struct lwp_info *lwp = get_thread_lwp (current_thread);
5884 return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT);
5887 /* Implement the to_supports_stopped_by_hw_breakpoint target_ops
5891 linux_supports_stopped_by_hw_breakpoint (void)
5893 return USE_SIGTRAP_SIGINFO;
5896 /* Implement the supports_hardware_single_step target_ops method. */
5899 linux_supports_hardware_single_step (void)
5901 return can_hardware_single_step ();
5905 linux_supports_software_single_step (void)
5907 return can_software_single_step ();
5911 linux_stopped_by_watchpoint (void)
5913 struct lwp_info *lwp = get_thread_lwp (current_thread);
5915 return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT;
5919 linux_stopped_data_address (void)
5921 struct lwp_info *lwp = get_thread_lwp (current_thread);
5923 return lwp->stopped_data_address;
5926 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
5927 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
5928 && defined(PT_TEXT_END_ADDR)
5930 /* This is only used for targets that define PT_TEXT_ADDR,
5931 PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly
5932 the target has different ways of acquiring this information, like
5935 /* Under uClinux, programs are loaded at non-zero offsets, which we need
5936 to tell gdb about. */
5939 linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
5941 unsigned long text, text_end, data;
5942 int pid = lwpid_of (current_thread);
5946 text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR,
5947 (PTRACE_TYPE_ARG4) 0);
5948 text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR,
5949 (PTRACE_TYPE_ARG4) 0);
5950 data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR,
5951 (PTRACE_TYPE_ARG4) 0);
5955 /* Both text and data offsets produced at compile-time (and so
5956 used by gdb) are relative to the beginning of the program,
5957 with the data segment immediately following the text segment.
5958 However, the actual runtime layout in memory may put the data
5959 somewhere else, so when we send gdb a data base-address, we
5960 use the real data base address and subtract the compile-time
5961 data base-address from it (which is just the length of the
5962 text segment). BSS immediately follows data in both
5965 *data_p = data - (text_end - text);
5974 linux_qxfer_osdata (const char *annex,
5975 unsigned char *readbuf, unsigned const char *writebuf,
5976 CORE_ADDR offset, int len)
5978 return linux_common_xfer_osdata (annex, readbuf, offset, len);
5981 /* Convert a native/host siginfo object, into/from the siginfo in the
5982 layout of the inferiors' architecture. */
5985 siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction)
5989 if (the_low_target.siginfo_fixup != NULL)
5990 done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction);
5992 /* If there was no callback, or the callback didn't do anything,
5993 then just do a straight memcpy. */
5997 memcpy (siginfo, inf_siginfo, sizeof (siginfo_t));
5999 memcpy (inf_siginfo, siginfo, sizeof (siginfo_t));
6004 linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
6005 unsigned const char *writebuf, CORE_ADDR offset, int len)
6009 char inf_siginfo[sizeof (siginfo_t)];
6011 if (current_thread == NULL)
6014 pid = lwpid_of (current_thread);
6017 debug_printf ("%s siginfo for lwp %d.\n",
6018 readbuf != NULL ? "Reading" : "Writing",
6021 if (offset >= sizeof (siginfo))
6024 if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0)
6027 /* When GDBSERVER is built as a 64-bit application, ptrace writes into
6028 SIGINFO an object with 64-bit layout. Since debugging a 32-bit
6029 inferior with a 64-bit GDBSERVER should look the same as debugging it
6030 with a 32-bit GDBSERVER, we need to convert it. */
6031 siginfo_fixup (&siginfo, inf_siginfo, 0);
6033 if (offset + len > sizeof (siginfo))
6034 len = sizeof (siginfo) - offset;
6036 if (readbuf != NULL)
6037 memcpy (readbuf, inf_siginfo + offset, len);
6040 memcpy (inf_siginfo + offset, writebuf, len);
6042 /* Convert back to ptrace layout before flushing it out. */
6043 siginfo_fixup (&siginfo, inf_siginfo, 1);
6045 if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0)
6052 /* SIGCHLD handler that serves two purposes: In non-stop/async mode,
6053 so we notice when children change state; as the handler for the
6054 sigsuspend in my_waitpid. */
6057 sigchld_handler (int signo)
6059 int old_errno = errno;
6065 /* fprintf is not async-signal-safe, so call write
6067 if (write (2, "sigchld_handler\n",
6068 sizeof ("sigchld_handler\n") - 1) < 0)
6069 break; /* just ignore */
6073 if (target_is_async_p ())
6074 async_file_mark (); /* trigger a linux_wait */
6080 linux_supports_non_stop (void)
6086 linux_async (int enable)
6088 int previous = target_is_async_p ();
6091 debug_printf ("linux_async (%d), previous=%d\n",
6094 if (previous != enable)
6097 sigemptyset (&mask);
6098 sigaddset (&mask, SIGCHLD);
6100 sigprocmask (SIG_BLOCK, &mask, NULL);
6104 if (pipe (linux_event_pipe) == -1)
6106 linux_event_pipe[0] = -1;
6107 linux_event_pipe[1] = -1;
6108 sigprocmask (SIG_UNBLOCK, &mask, NULL);
6110 warning ("creating event pipe failed.");
6114 fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK);
6115 fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK);
6117 /* Register the event loop handler. */
6118 add_file_handler (linux_event_pipe[0],
6119 handle_target_event, NULL);
6121 /* Always trigger a linux_wait. */
6126 delete_file_handler (linux_event_pipe[0]);
6128 close (linux_event_pipe[0]);
6129 close (linux_event_pipe[1]);
6130 linux_event_pipe[0] = -1;
6131 linux_event_pipe[1] = -1;
6134 sigprocmask (SIG_UNBLOCK, &mask, NULL);
6141 linux_start_non_stop (int nonstop)
6143 /* Register or unregister from event-loop accordingly. */
6144 linux_async (nonstop);
6146 if (target_is_async_p () != (nonstop != 0))
6153 linux_supports_multi_process (void)
6158 /* Check if fork events are supported. */
6161 linux_supports_fork_events (void)
6163 return linux_supports_tracefork ();
6166 /* Check if vfork events are supported. */
6169 linux_supports_vfork_events (void)
6171 return linux_supports_tracefork ();
6174 /* Check if exec events are supported. */
6177 linux_supports_exec_events (void)
6179 return linux_supports_traceexec ();
6182 /* Callback for 'find_inferior'. Set the (possibly changed) ptrace
6183 options for the specified lwp. */
6186 reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry,
6189 struct thread_info *thread = (struct thread_info *) entry;
6190 struct lwp_info *lwp = get_thread_lwp (thread);
6194 /* Stop the lwp so we can modify its ptrace options. */
6195 lwp->must_set_ptrace_flags = 1;
6196 linux_stop_lwp (lwp);
6200 /* Already stopped; go ahead and set the ptrace options. */
6201 struct process_info *proc = find_process_pid (pid_of (thread));
6202 int options = linux_low_ptrace_options (proc->attached);
6204 linux_enable_event_reporting (lwpid_of (thread), options);
6205 lwp->must_set_ptrace_flags = 0;
6211 /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the
6212 ptrace flags for all inferiors. This is in case the new GDB connection
6213 doesn't support the same set of events that the previous one did. */
6216 linux_handle_new_gdb_connection (void)
6220 /* Request that all the lwps reset their ptrace options. */
6221 find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid);
6225 linux_supports_disable_randomization (void)
6227 #ifdef HAVE_PERSONALITY
6235 linux_supports_agent (void)
6241 linux_supports_range_stepping (void)
6243 if (*the_low_target.supports_range_stepping == NULL)
6246 return (*the_low_target.supports_range_stepping) ();
6249 /* Enumerate spufs IDs for process PID. */
6251 spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len)
6257 struct dirent *entry;
6259 sprintf (path, "/proc/%ld/fd", pid);
6260 dir = opendir (path);
6265 while ((entry = readdir (dir)) != NULL)
6271 fd = atoi (entry->d_name);
6275 sprintf (path, "/proc/%ld/fd/%d", pid, fd);
6276 if (stat (path, &st) != 0)
6278 if (!S_ISDIR (st.st_mode))
6281 if (statfs (path, &stfs) != 0)
6283 if (stfs.f_type != SPUFS_MAGIC)
6286 if (pos >= offset && pos + 4 <= offset + len)
6288 *(unsigned int *)(buf + pos - offset) = fd;
6298 /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
6299 object type, using the /proc file system. */
6301 linux_qxfer_spu (const char *annex, unsigned char *readbuf,
6302 unsigned const char *writebuf,
6303 CORE_ADDR offset, int len)
6305 long pid = lwpid_of (current_thread);
6310 if (!writebuf && !readbuf)
6318 return spu_enumerate_spu_ids (pid, readbuf, offset, len);
6321 sprintf (buf, "/proc/%ld/fd/%s", pid, annex);
6322 fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
6327 && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
6334 ret = write (fd, writebuf, (size_t) len);
6336 ret = read (fd, readbuf, (size_t) len);
6342 #if defined PT_GETDSBT || defined PTRACE_GETFDPIC
6343 struct target_loadseg
6345 /* Core address to which the segment is mapped. */
6347 /* VMA recorded in the program header. */
6349 /* Size of this segment in memory. */
6353 # if defined PT_GETDSBT
6354 struct target_loadmap
6356 /* Protocol version number, must be zero. */
6358 /* Pointer to the DSBT table, its size, and the DSBT index. */
6359 unsigned *dsbt_table;
6360 unsigned dsbt_size, dsbt_index;
6361 /* Number of segments in this map. */
6363 /* The actual memory map. */
6364 struct target_loadseg segs[/*nsegs*/];
6366 # define LINUX_LOADMAP PT_GETDSBT
6367 # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
6368 # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
6370 struct target_loadmap
6372 /* Protocol version number, must be zero. */
6374 /* Number of segments in this map. */
6376 /* The actual memory map. */
6377 struct target_loadseg segs[/*nsegs*/];
6379 # define LINUX_LOADMAP PTRACE_GETFDPIC
6380 # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
6381 # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
6385 linux_read_loadmap (const char *annex, CORE_ADDR offset,
6386 unsigned char *myaddr, unsigned int len)
6388 int pid = lwpid_of (current_thread);
6390 struct target_loadmap *data = NULL;
6391 unsigned int actual_length, copy_length;
6393 if (strcmp (annex, "exec") == 0)
6394 addr = (int) LINUX_LOADMAP_EXEC;
6395 else if (strcmp (annex, "interp") == 0)
6396 addr = (int) LINUX_LOADMAP_INTERP;
6400 if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0)
6406 actual_length = sizeof (struct target_loadmap)
6407 + sizeof (struct target_loadseg) * data->nsegs;
6409 if (offset < 0 || offset > actual_length)
6412 copy_length = actual_length - offset < len ? actual_length - offset : len;
6413 memcpy (myaddr, (char *) data + offset, copy_length);
6417 # define linux_read_loadmap NULL
6418 #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
6421 linux_process_qsupported (char **features, int count)
6423 if (the_low_target.process_qsupported != NULL)
6424 the_low_target.process_qsupported (features, count);
6428 linux_supports_catch_syscall (void)
6430 return (the_low_target.get_syscall_trapinfo != NULL
6431 && linux_supports_tracesysgood ());
6435 linux_supports_tracepoints (void)
6437 if (*the_low_target.supports_tracepoints == NULL)
6440 return (*the_low_target.supports_tracepoints) ();
6444 linux_read_pc (struct regcache *regcache)
6446 if (the_low_target.get_pc == NULL)
6449 return (*the_low_target.get_pc) (regcache);
6453 linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
6455 gdb_assert (the_low_target.set_pc != NULL);
6457 (*the_low_target.set_pc) (regcache, pc);
6461 linux_thread_stopped (struct thread_info *thread)
6463 return get_thread_lwp (thread)->stopped;
6466 /* This exposes stop-all-threads functionality to other modules. */
6469 linux_pause_all (int freeze)
6471 stop_all_lwps (freeze, NULL);
6474 /* This exposes unstop-all-threads functionality to other gdbserver
6478 linux_unpause_all (int unfreeze)
6480 unstop_all_lwps (unfreeze, NULL);
6484 linux_prepare_to_access_memory (void)
6486 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6489 linux_pause_all (1);
6494 linux_done_accessing_memory (void)
6496 /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
6499 linux_unpause_all (1);
6503 linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
6504 CORE_ADDR collector,
6507 CORE_ADDR *jump_entry,
6508 CORE_ADDR *trampoline,
6509 ULONGEST *trampoline_size,
6510 unsigned char *jjump_pad_insn,
6511 ULONGEST *jjump_pad_insn_size,
6512 CORE_ADDR *adjusted_insn_addr,
6513 CORE_ADDR *adjusted_insn_addr_end,
6516 return (*the_low_target.install_fast_tracepoint_jump_pad)
6517 (tpoint, tpaddr, collector, lockaddr, orig_size,
6518 jump_entry, trampoline, trampoline_size,
6519 jjump_pad_insn, jjump_pad_insn_size,
6520 adjusted_insn_addr, adjusted_insn_addr_end,
6524 static struct emit_ops *
6525 linux_emit_ops (void)
6527 if (the_low_target.emit_ops != NULL)
6528 return (*the_low_target.emit_ops) ();
6534 linux_get_min_fast_tracepoint_insn_len (void)
6536 return (*the_low_target.get_min_fast_tracepoint_insn_len) ();
6539 /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
6542 get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64,
6543 CORE_ADDR *phdr_memaddr, int *num_phdr)
6545 char filename[PATH_MAX];
6547 const int auxv_size = is_elf64
6548 ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t);
6549 char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */
6551 xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
6553 fd = open (filename, O_RDONLY);
6559 while (read (fd, buf, auxv_size) == auxv_size
6560 && (*phdr_memaddr == 0 || *num_phdr == 0))
6564 Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf;
6566 switch (aux->a_type)
6569 *phdr_memaddr = aux->a_un.a_val;
6572 *num_phdr = aux->a_un.a_val;
6578 Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf;
6580 switch (aux->a_type)
6583 *phdr_memaddr = aux->a_un.a_val;
6586 *num_phdr = aux->a_un.a_val;
6594 if (*phdr_memaddr == 0 || *num_phdr == 0)
6596 warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
6597 "phdr_memaddr = %ld, phdr_num = %d",
6598 (long) *phdr_memaddr, *num_phdr);
6605 /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
6608 get_dynamic (const int pid, const int is_elf64)
6610 CORE_ADDR phdr_memaddr, relocation;
6612 unsigned char *phdr_buf;
6613 const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr);
6615 if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr))
6618 gdb_assert (num_phdr < 100); /* Basic sanity check. */
6619 phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size);
6621 if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size))
6624 /* Compute relocation: it is expected to be 0 for "regular" executables,
6625 non-zero for PIE ones. */
6627 for (i = 0; relocation == -1 && i < num_phdr; i++)
6630 Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size);
6632 if (p->p_type == PT_PHDR)
6633 relocation = phdr_memaddr - p->p_vaddr;
6637 Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size);
6639 if (p->p_type == PT_PHDR)
6640 relocation = phdr_memaddr - p->p_vaddr;
6643 if (relocation == -1)
6645 /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
6646 any real world executables, including PIE executables, have always
6647 PT_PHDR present. PT_PHDR is not present in some shared libraries or
6648 in fpc (Free Pascal 2.4) binaries but neither of those have a need for
6649 or present DT_DEBUG anyway (fpc binaries are statically linked).
6651 Therefore if there exists DT_DEBUG there is always also PT_PHDR.
6653 GDB could find RELOCATION also from AT_ENTRY - e_entry. */
6658 for (i = 0; i < num_phdr; i++)
6662 Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size);
6664 if (p->p_type == PT_DYNAMIC)
6665 return p->p_vaddr + relocation;
6669 Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size);
6671 if (p->p_type == PT_DYNAMIC)
6672 return p->p_vaddr + relocation;
6679 /* Return &_r_debug in the inferior, or -1 if not present. Return value
6680 can be 0 if the inferior does not yet have the library list initialized.
6681 We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of
6682 DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */
6685 get_r_debug (const int pid, const int is_elf64)
6687 CORE_ADDR dynamic_memaddr;
6688 const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn);
6689 unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */
6692 dynamic_memaddr = get_dynamic (pid, is_elf64);
6693 if (dynamic_memaddr == 0)
6696 while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0)
6700 Elf64_Dyn *const dyn = (Elf64_Dyn *) buf;
6701 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6705 unsigned char buf[sizeof (Elf64_Xword)];
6709 #ifdef DT_MIPS_RLD_MAP
6710 if (dyn->d_tag == DT_MIPS_RLD_MAP)
6712 if (linux_read_memory (dyn->d_un.d_val,
6713 rld_map.buf, sizeof (rld_map.buf)) == 0)
6718 #endif /* DT_MIPS_RLD_MAP */
6719 #ifdef DT_MIPS_RLD_MAP_REL
6720 if (dyn->d_tag == DT_MIPS_RLD_MAP_REL)
6722 if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr,
6723 rld_map.buf, sizeof (rld_map.buf)) == 0)
6728 #endif /* DT_MIPS_RLD_MAP_REL */
6730 if (dyn->d_tag == DT_DEBUG && map == -1)
6731 map = dyn->d_un.d_val;
6733 if (dyn->d_tag == DT_NULL)
6738 Elf32_Dyn *const dyn = (Elf32_Dyn *) buf;
6739 #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL
6743 unsigned char buf[sizeof (Elf32_Word)];
6747 #ifdef DT_MIPS_RLD_MAP
6748 if (dyn->d_tag == DT_MIPS_RLD_MAP)
6750 if (linux_read_memory (dyn->d_un.d_val,
6751 rld_map.buf, sizeof (rld_map.buf)) == 0)
6756 #endif /* DT_MIPS_RLD_MAP */
6757 #ifdef DT_MIPS_RLD_MAP_REL
6758 if (dyn->d_tag == DT_MIPS_RLD_MAP_REL)
6760 if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr,
6761 rld_map.buf, sizeof (rld_map.buf)) == 0)
6766 #endif /* DT_MIPS_RLD_MAP_REL */
6768 if (dyn->d_tag == DT_DEBUG && map == -1)
6769 map = dyn->d_un.d_val;
6771 if (dyn->d_tag == DT_NULL)
6775 dynamic_memaddr += dyn_size;
6781 /* Read one pointer from MEMADDR in the inferior. */
6784 read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size)
6788 /* Go through a union so this works on either big or little endian
6789 hosts, when the inferior's pointer size is smaller than the size
6790 of CORE_ADDR. It is assumed the inferior's endianness is the
6791 same of the superior's. */
6794 CORE_ADDR core_addr;
6799 ret = linux_read_memory (memaddr, &addr.uc, ptr_size);
6802 if (ptr_size == sizeof (CORE_ADDR))
6803 *ptr = addr.core_addr;
6804 else if (ptr_size == sizeof (unsigned int))
6807 gdb_assert_not_reached ("unhandled pointer size");
6812 struct link_map_offsets
6814 /* Offset and size of r_debug.r_version. */
6815 int r_version_offset;
6817 /* Offset and size of r_debug.r_map. */
6820 /* Offset to l_addr field in struct link_map. */
6823 /* Offset to l_name field in struct link_map. */
6826 /* Offset to l_ld field in struct link_map. */
6829 /* Offset to l_next field in struct link_map. */
6832 /* Offset to l_prev field in struct link_map. */
6836 /* Construct qXfer:libraries-svr4:read reply. */
6839 linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
6840 unsigned const char *writebuf,
6841 CORE_ADDR offset, int len)
6844 unsigned document_len;
6845 struct process_info_private *const priv = current_process ()->priv;
6846 char filename[PATH_MAX];
6849 static const struct link_map_offsets lmo_32bit_offsets =
6851 0, /* r_version offset. */
6852 4, /* r_debug.r_map offset. */
6853 0, /* l_addr offset in link_map. */
6854 4, /* l_name offset in link_map. */
6855 8, /* l_ld offset in link_map. */
6856 12, /* l_next offset in link_map. */
6857 16 /* l_prev offset in link_map. */
6860 static const struct link_map_offsets lmo_64bit_offsets =
6862 0, /* r_version offset. */
6863 8, /* r_debug.r_map offset. */
6864 0, /* l_addr offset in link_map. */
6865 8, /* l_name offset in link_map. */
6866 16, /* l_ld offset in link_map. */
6867 24, /* l_next offset in link_map. */
6868 32 /* l_prev offset in link_map. */
6870 const struct link_map_offsets *lmo;
6871 unsigned int machine;
6873 CORE_ADDR lm_addr = 0, lm_prev = 0;
6874 int allocated = 1024;
6876 CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev;
6877 int header_done = 0;
6879 if (writebuf != NULL)
6881 if (readbuf == NULL)
6884 pid = lwpid_of (current_thread);
6885 xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid);
6886 is_elf64 = elf_64_file_p (filename, &machine);
6887 lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets;
6888 ptr_size = is_elf64 ? 8 : 4;
6890 while (annex[0] != '\0')
6896 sep = strchr (annex, '=');
6901 if (len == 5 && startswith (annex, "start"))
6903 else if (len == 4 && startswith (annex, "prev"))
6907 annex = strchr (sep, ';');
6914 annex = decode_address_to_semicolon (addrp, sep + 1);
6921 if (priv->r_debug == 0)
6922 priv->r_debug = get_r_debug (pid, is_elf64);
6924 /* We failed to find DT_DEBUG. Such situation will not change
6925 for this inferior - do not retry it. Report it to GDB as
6926 E01, see for the reasons at the GDB solib-svr4.c side. */
6927 if (priv->r_debug == (CORE_ADDR) -1)
6930 if (priv->r_debug != 0)
6932 if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
6933 (unsigned char *) &r_version,
6934 sizeof (r_version)) != 0
6937 warning ("unexpected r_debug version %d", r_version);
6939 else if (read_one_ptr (priv->r_debug + lmo->r_map_offset,
6940 &lm_addr, ptr_size) != 0)
6942 warning ("unable to read r_map from 0x%lx",
6943 (long) priv->r_debug + lmo->r_map_offset);
6948 document = (char *) xmalloc (allocated);
6949 strcpy (document, "<library-list-svr4 version=\"1.0\"");
6950 p = document + strlen (document);
6953 && read_one_ptr (lm_addr + lmo->l_name_offset,
6954 &l_name, ptr_size) == 0
6955 && read_one_ptr (lm_addr + lmo->l_addr_offset,
6956 &l_addr, ptr_size) == 0
6957 && read_one_ptr (lm_addr + lmo->l_ld_offset,
6958 &l_ld, ptr_size) == 0
6959 && read_one_ptr (lm_addr + lmo->l_prev_offset,
6960 &l_prev, ptr_size) == 0
6961 && read_one_ptr (lm_addr + lmo->l_next_offset,
6962 &l_next, ptr_size) == 0)
6964 unsigned char libname[PATH_MAX];
6966 if (lm_prev != l_prev)
6968 warning ("Corrupted shared library list: 0x%lx != 0x%lx",
6969 (long) lm_prev, (long) l_prev);
6973 /* Ignore the first entry even if it has valid name as the first entry
6974 corresponds to the main executable. The first entry should not be
6975 skipped if the dynamic loader was loaded late by a static executable
6976 (see solib-svr4.c parameter ignore_first). But in such case the main
6977 executable does not have PT_DYNAMIC present and this function already
6978 exited above due to failed get_r_debug. */
6981 sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr);
6986 /* Not checking for error because reading may stop before
6987 we've got PATH_MAX worth of characters. */
6989 linux_read_memory (l_name, libname, sizeof (libname) - 1);
6990 libname[sizeof (libname) - 1] = '\0';
6991 if (libname[0] != '\0')
6993 /* 6x the size for xml_escape_text below. */
6994 size_t len = 6 * strlen ((char *) libname);
6999 /* Terminate `<library-list-svr4'. */
7004 while (allocated < p - document + len + 200)
7006 /* Expand to guarantee sufficient storage. */
7007 uintptr_t document_len = p - document;
7009 document = (char *) xrealloc (document, 2 * allocated);
7011 p = document + document_len;
7014 name = xml_escape_text ((char *) libname);
7015 p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" "
7016 "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
7017 name, (unsigned long) lm_addr,
7018 (unsigned long) l_addr, (unsigned long) l_ld);
7029 /* Empty list; terminate `<library-list-svr4'. */
7033 strcpy (p, "</library-list-svr4>");
7035 document_len = strlen (document);
7036 if (offset < document_len)
7037 document_len -= offset;
7040 if (len > document_len)
7043 memcpy (readbuf, document + offset, len);
7049 #ifdef HAVE_LINUX_BTRACE
7051 /* See to_disable_btrace target method. */
7054 linux_low_disable_btrace (struct btrace_target_info *tinfo)
7056 enum btrace_error err;
7058 err = linux_disable_btrace (tinfo);
7059 return (err == BTRACE_ERR_NONE ? 0 : -1);
7062 /* Encode an Intel Processor Trace configuration. */
7065 linux_low_encode_pt_config (struct buffer *buffer,
7066 const struct btrace_data_pt_config *config)
7068 buffer_grow_str (buffer, "<pt-config>\n");
7070 switch (config->cpu.vendor)
7073 buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" "
7074 "model=\"%u\" stepping=\"%u\"/>\n",
7075 config->cpu.family, config->cpu.model,
7076 config->cpu.stepping);
7083 buffer_grow_str (buffer, "</pt-config>\n");
7086 /* Encode a raw buffer. */
7089 linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data,
7095 /* We use hex encoding - see common/rsp-low.h. */
7096 buffer_grow_str (buffer, "<raw>\n");
7102 elem[0] = tohex ((*data >> 4) & 0xf);
7103 elem[1] = tohex (*data++ & 0xf);
7105 buffer_grow (buffer, elem, 2);
7108 buffer_grow_str (buffer, "</raw>\n");
7111 /* See to_read_btrace target method. */
7114 linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer,
7115 enum btrace_read_type type)
7117 struct btrace_data btrace;
7118 struct btrace_block *block;
7119 enum btrace_error err;
7122 btrace_data_init (&btrace);
7124 err = linux_read_btrace (&btrace, tinfo, type);
7125 if (err != BTRACE_ERR_NONE)
7127 if (err == BTRACE_ERR_OVERFLOW)
7128 buffer_grow_str0 (buffer, "E.Overflow.");
7130 buffer_grow_str0 (buffer, "E.Generic Error.");
7135 switch (btrace.format)
7137 case BTRACE_FORMAT_NONE:
7138 buffer_grow_str0 (buffer, "E.No Trace.");
7141 case BTRACE_FORMAT_BTS:
7142 buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7143 buffer_grow_str (buffer, "<btrace version=\"1.0\">\n");
7146 VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block);
7148 buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n",
7149 paddress (block->begin), paddress (block->end));
7151 buffer_grow_str0 (buffer, "</btrace>\n");
7154 case BTRACE_FORMAT_PT:
7155 buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n");
7156 buffer_grow_str (buffer, "<btrace version=\"1.0\">\n");
7157 buffer_grow_str (buffer, "<pt>\n");
7159 linux_low_encode_pt_config (buffer, &btrace.variant.pt.config);
7161 linux_low_encode_raw (buffer, btrace.variant.pt.data,
7162 btrace.variant.pt.size);
7164 buffer_grow_str (buffer, "</pt>\n");
7165 buffer_grow_str0 (buffer, "</btrace>\n");
7169 buffer_grow_str0 (buffer, "E.Unsupported Trace Format.");
7173 btrace_data_fini (&btrace);
7177 btrace_data_fini (&btrace);
7181 /* See to_btrace_conf target method. */
7184 linux_low_btrace_conf (const struct btrace_target_info *tinfo,
7185 struct buffer *buffer)
7187 const struct btrace_config *conf;
7189 buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n");
7190 buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n");
7192 conf = linux_btrace_conf (tinfo);
7195 switch (conf->format)
7197 case BTRACE_FORMAT_NONE:
7200 case BTRACE_FORMAT_BTS:
7201 buffer_xml_printf (buffer, "<bts");
7202 buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size);
7203 buffer_xml_printf (buffer, " />\n");
7206 case BTRACE_FORMAT_PT:
7207 buffer_xml_printf (buffer, "<pt");
7208 buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size);
7209 buffer_xml_printf (buffer, "/>\n");
7214 buffer_grow_str0 (buffer, "</btrace-conf>\n");
7217 #endif /* HAVE_LINUX_BTRACE */
7219 /* See nat/linux-nat.h. */
7222 current_lwp_ptid (void)
7224 return ptid_of (current_thread);
7227 /* Implementation of the target_ops method "breakpoint_kind_from_pc". */
7230 linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
7232 if (the_low_target.breakpoint_kind_from_pc != NULL)
7233 return (*the_low_target.breakpoint_kind_from_pc) (pcptr);
7235 return default_breakpoint_kind_from_pc (pcptr);
7238 /* Implementation of the target_ops method "sw_breakpoint_from_kind". */
7240 static const gdb_byte *
7241 linux_sw_breakpoint_from_kind (int kind, int *size)
7243 gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL);
7245 return (*the_low_target.sw_breakpoint_from_kind) (kind, size);
7248 /* Implementation of the target_ops method
7249 "breakpoint_kind_from_current_state". */
7252 linux_breakpoint_kind_from_current_state (CORE_ADDR *pcptr)
7254 if (the_low_target.breakpoint_kind_from_current_state != NULL)
7255 return (*the_low_target.breakpoint_kind_from_current_state) (pcptr);
7257 return linux_breakpoint_kind_from_pc (pcptr);
7260 static struct target_ops linux_target_ops = {
7261 linux_create_inferior,
7262 linux_post_create_inferior,
7271 linux_fetch_registers,
7272 linux_store_registers,
7273 linux_prepare_to_access_memory,
7274 linux_done_accessing_memory,
7277 linux_look_up_symbols,
7278 linux_request_interrupt,
7280 linux_supports_z_point_type,
7283 linux_stopped_by_sw_breakpoint,
7284 linux_supports_stopped_by_sw_breakpoint,
7285 linux_stopped_by_hw_breakpoint,
7286 linux_supports_stopped_by_hw_breakpoint,
7287 linux_supports_hardware_single_step,
7288 linux_stopped_by_watchpoint,
7289 linux_stopped_data_address,
7290 #if defined(__UCLIBC__) && defined(HAS_NOMMU) \
7291 && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
7292 && defined(PT_TEXT_END_ADDR)
7297 #ifdef USE_THREAD_DB
7298 thread_db_get_tls_address,
7303 hostio_last_error_from_errno,
7306 linux_supports_non_stop,
7308 linux_start_non_stop,
7309 linux_supports_multi_process,
7310 linux_supports_fork_events,
7311 linux_supports_vfork_events,
7312 linux_supports_exec_events,
7313 linux_handle_new_gdb_connection,
7314 #ifdef USE_THREAD_DB
7315 thread_db_handle_monitor_command,
7319 linux_common_core_of_thread,
7321 linux_process_qsupported,
7322 linux_supports_tracepoints,
7325 linux_thread_stopped,
7329 linux_stabilize_threads,
7330 linux_install_fast_tracepoint_jump_pad,
7332 linux_supports_disable_randomization,
7333 linux_get_min_fast_tracepoint_insn_len,
7334 linux_qxfer_libraries_svr4,
7335 linux_supports_agent,
7336 #ifdef HAVE_LINUX_BTRACE
7337 linux_supports_btrace,
7338 linux_enable_btrace,
7339 linux_low_disable_btrace,
7340 linux_low_read_btrace,
7341 linux_low_btrace_conf,
7349 linux_supports_range_stepping,
7350 linux_proc_pid_to_exec_file,
7351 linux_mntns_open_cloexec,
7353 linux_mntns_readlink,
7354 linux_breakpoint_kind_from_pc,
7355 linux_sw_breakpoint_from_kind,
7356 linux_proc_tid_get_name,
7357 linux_breakpoint_kind_from_current_state,
7358 linux_supports_software_single_step,
7359 linux_supports_catch_syscall,
7362 #ifdef HAVE_LINUX_REGSETS
7364 initialize_regsets_info (struct regsets_info *info)
7366 for (info->num_regsets = 0;
7367 info->regsets[info->num_regsets].size >= 0;
7368 info->num_regsets++)
7374 initialize_low (void)
7376 struct sigaction sigchld_action;
7378 memset (&sigchld_action, 0, sizeof (sigchld_action));
7379 set_target_ops (&linux_target_ops);
7381 linux_ptrace_init_warnings ();
7383 sigchld_action.sa_handler = sigchld_handler;
7384 sigemptyset (&sigchld_action.sa_mask);
7385 sigchld_action.sa_flags = SA_RESTART;
7386 sigaction (SIGCHLD, &sigchld_action, NULL);
7388 initialize_low_arch ();
7390 linux_check_ptrace_features ();