| /* Native debugging support for GNU/Linux (LWP layer). |
| |
| Copyright (C) 2000-2016 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "nat/linux-nat.h" |
| #include "target.h" |
| #include <signal.h> |
| |
| struct arch_lwp_info; |
| |
| /* Structure describing an LWP. This is public only for the purposes |
| of ALL_LWPS; target-specific code should generally not access it |
| directly. */ |
| |
| struct lwp_info |
| { |
| /* The process id of the LWP. This is a combination of the LWP id |
| and overall process id. */ |
| ptid_t ptid; |
| |
| /* If this flag is set, we need to set the event request flags the |
| next time we see this LWP stop. */ |
| int must_set_ptrace_flags; |
| |
| /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report |
| it back yet). */ |
| int signalled; |
| |
| /* Non-zero if this LWP is stopped. */ |
| int stopped; |
| |
| /* Non-zero if this LWP will be/has been resumed. Note that an LWP |
| can be marked both as stopped and resumed at the same time. This |
| happens if we try to resume an LWP that has a wait status |
| pending. We shouldn't let the LWP run until that wait status has |
| been processed, but we should not report that wait status if GDB |
| didn't try to let the LWP run. */ |
| int resumed; |
| |
| /* The last resume GDB requested on this thread. */ |
| enum resume_kind last_resume_kind; |
| |
| /* If non-zero, a pending wait status. */ |
| int status; |
| |
| /* When 'stopped' is set, this is where the lwp last stopped, with |
| decr_pc_after_break already accounted for. If the LWP is |
| running, and stepping, this is the address at which the lwp was |
| resumed (that is, it's the previous stop PC). If the LWP is |
| running and not stepping, this is 0. */ |
| CORE_ADDR stop_pc; |
| |
| /* Non-zero if we were stepping this LWP. */ |
| int step; |
| |
| /* The reason the LWP last stopped, if we need to track it |
| (breakpoint, watchpoint, etc.) */ |
| enum target_stop_reason stop_reason; |
| |
| /* On architectures where it is possible to know the data address of |
| a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and |
| STOPPED_DATA_ADDRESS contains such data address. Otherwise, |
| STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is |
| undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */ |
| int stopped_data_address_p; |
| CORE_ADDR stopped_data_address; |
| |
| /* Non-zero if we expect a duplicated SIGINT. */ |
| int ignore_sigint; |
| |
| /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus |
| for this LWP's last event. This may correspond to STATUS above, |
| or to a local variable in lin_lwp_wait. */ |
| struct target_waitstatus waitstatus; |
| |
| /* Signal whether we are in a SYSCALL_ENTRY or |
| in a SYSCALL_RETURN event. |
| Values: |
| - TARGET_WAITKIND_SYSCALL_ENTRY |
| - TARGET_WAITKIND_SYSCALL_RETURN */ |
| enum target_waitkind syscall_state; |
| |
| /* The processor core this LWP was last seen on. */ |
| int core; |
| |
| /* Arch-specific additions. */ |
| struct arch_lwp_info *arch_private; |
| |
| /* Previous and next pointers in doubly-linked list of known LWPs, |
| sorted by reverse creation order. */ |
| struct lwp_info *prev; |
| struct lwp_info *next; |
| }; |
| |
| /* The global list of LWPs, for ALL_LWPS. Unlike the threads list, |
| there is always at least one LWP on the list while the GNU/Linux |
| native target is active. */ |
| extern struct lwp_info *lwp_list; |
| |
| /* Does the current host support PTRACE_GETREGSET? */ |
| extern enum tribool have_ptrace_getregset; |
| |
| /* Iterate over each active thread (light-weight process). */ |
| #define ALL_LWPS(LP) \ |
| for ((LP) = lwp_list; \ |
| (LP) != NULL; \ |
| (LP) = (LP)->next) |
| |
| /* Attempt to initialize libthread_db. */ |
| void check_for_thread_db (void); |
| |
| /* Called from the LWP layer to inform the thread_db layer that PARENT |
| spawned CHILD. Both LWPs are currently stopped. This function |
| does whatever is required to have the child LWP under the |
| thread_db's control --- e.g., enabling event reporting. Returns |
| true on success, false if the process isn't using libpthread. */ |
| extern int thread_db_notice_clone (ptid_t parent, ptid_t child); |
| |
| /* Return the set of signals used by the threads library. */ |
| extern void lin_thread_get_thread_signals (sigset_t *mask); |
| |
| /* Find process PID's pending signal set from /proc/pid/status. */ |
| void linux_proc_pending_signals (int pid, sigset_t *pending, |
| sigset_t *blocked, sigset_t *ignored); |
| |
| /* For linux_stop_lwp see nat/linux-nat.h. */ |
| |
| /* Stop all LWPs, synchronously. (Any events that trigger while LWPs |
| are being stopped are left pending.) */ |
| extern void linux_stop_and_wait_all_lwps (void); |
| |
| /* Set resumed LWPs running again, as they were before being stopped |
| with linux_stop_and_wait_all_lwps. (LWPS with pending events are |
| left stopped.) */ |
| extern void linux_unstop_all_lwps (void); |
| |
| /* Create a prototype generic GNU/Linux target. The client can |
| override it with local methods. */ |
| struct target_ops * linux_target (void); |
| |
| /* Create a generic GNU/Linux target using traditional |
| ptrace register access. */ |
| struct target_ops * |
| linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)); |
| |
| /* Register the customized GNU/Linux target. This should be used |
| instead of calling add_target directly. */ |
| void linux_nat_add_target (struct target_ops *); |
| |
| /* Register a method to call whenever a new thread is attached. */ |
| void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *)); |
| |
| |
| /* Register a method to call whenever a new fork is attached. */ |
| typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent, |
| pid_t child_pid); |
| void linux_nat_set_new_fork (struct target_ops *ops, |
| linux_nat_new_fork_ftype *fn); |
| |
| /* Register a method to call whenever a process is killed or |
| detached. */ |
| typedef void (linux_nat_forget_process_ftype) (pid_t pid); |
| void linux_nat_set_forget_process (struct target_ops *ops, |
| linux_nat_forget_process_ftype *fn); |
| |
| /* Call the method registered with the function above. PID is the |
| process to forget about. */ |
| void linux_nat_forget_process (pid_t pid); |
| |
| /* Register a method that converts a siginfo object between the layout |
| that ptrace returns, and the layout in the architecture of the |
| inferior. */ |
| void linux_nat_set_siginfo_fixup (struct target_ops *, |
| int (*) (siginfo_t *, |
| gdb_byte *, |
| int)); |
| |
| /* Register a method to call prior to resuming a thread. */ |
| |
| void linux_nat_set_prepare_to_resume (struct target_ops *, |
| void (*) (struct lwp_info *)); |
| |
| /* Update linux-nat internal state when changing from one fork |
| to another. */ |
| void linux_nat_switch_fork (ptid_t new_ptid); |
| |
| /* Store the saved siginfo associated with PTID in *SIGINFO. |
| Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is |
| uninitialized in such case). */ |
| int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo); |
| |
| /* Set alternative SIGTRAP-like events recognizer. */ |
| void linux_nat_set_status_is_event (struct target_ops *t, |
| int (*status_is_event) (int status)); |