25289eb274
* linux-nat.h (enum resume_kind): New. (struct lwp_info) <last_resume_kind>: New field. (linux_child_follow_fork): Set last_resume_kind to resume_stop on the new lwp. (add_lwp): Set last_resume_kind as resume_continue by default. (lin_lwp_attach_lwp): Set last_resume_kind as resume_stop. (resume_lwp): New, factored out from resume_callback. Also check for pending status in lp->waitstatus. (resume_callback): Reimplement. (resume_clear_callback): Set last_resume_kind as resume_stop. (resume_set_callback): Set last_resume_kind as resume_continue. (linux_nat_resume, linux_handle_extended_wait): Set last_resume_kind. (running_callback): Also check lp->waitstatus for pending events. (select_singlestep_lwp_callback): Check that lp->last_resume_kind is resume_step. (stop_and_resume_callback): Don't re-resume if the core wanted the lwp stopped. Use resume_lwp instead of resume_callback. Avoid using an invalidated pointer. (linux_nat_filter_event): Don't discard SIGSTOPs as delayed SIGSTOPs if the core wanted the LWP to stop. (linux_nat_wait_1) Don't consume a pending SIGSTOP if the core wanted the lwp to stop. If the core wanted the lwp to stop, and the lwp stopped with a SIGSTOP, report a TARGET_SIGNAL_0 instead of TARGET_SIGNAL_STOP. (linux_nat_stop_lwp): Don't synchronously wait for the lwp to stop here. Instead, signal the lwp, and set the last_resume_kind to resume_stop.
192 lines
6.4 KiB
C
192 lines
6.4 KiB
C
/* Native debugging support for GNU/Linux (LWP layer).
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Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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2010, 2011 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "target.h"
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#include <signal.h>
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/* Ways to "resume" a thread. */
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enum resume_kind
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{
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/* Thread should continue. */
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resume_continue,
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/* Thread should single-step. */
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resume_step,
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/* Thread should be stopped. */
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resume_stop
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};
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/* Structure describing an LWP. This is public only for the purposes
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of ALL_LWPS; target-specific code should generally not access it
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directly. */
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struct lwp_info
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{
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/* The process id of the LWP. This is a combination of the LWP id
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and overall process id. */
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ptid_t ptid;
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/* Non-zero if this LWP is cloned. In this context "cloned" means
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that the LWP is reporting to its parent using a signal other than
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SIGCHLD. */
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int cloned;
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/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
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it back yet). */
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int signalled;
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/* Non-zero if this LWP is stopped. */
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int stopped;
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/* Non-zero if this LWP will be/has been resumed. Note that an LWP
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can be marked both as stopped and resumed at the same time. This
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happens if we try to resume an LWP that has a wait status
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pending. We shouldn't let the LWP run until that wait status has
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been processed, but we should not report that wait status if GDB
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didn't try to let the LWP run. */
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int resumed;
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/* The last resume GDB requested on this thread. */
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enum resume_kind last_resume_kind;
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/* If non-zero, a pending wait status. */
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int status;
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/* Non-zero if we were stepping this LWP. */
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int step;
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/* Non-zero si_signo if this LWP stopped with a trap. si_addr may
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be the address of a hardware watchpoint. */
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struct siginfo siginfo;
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/* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
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watchpoint trap. */
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int stopped_by_watchpoint;
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/* On architectures where it is possible to know the data address of
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a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
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STOPPED_DATA_ADDRESS contains such data address. Otherwise,
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STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
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undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */
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int stopped_data_address_p;
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CORE_ADDR stopped_data_address;
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/* Non-zero if we expect a duplicated SIGINT. */
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int ignore_sigint;
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/* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
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for this LWP's last event. This may correspond to STATUS above,
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or to a local variable in lin_lwp_wait. */
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struct target_waitstatus waitstatus;
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/* Signal wether we are in a SYSCALL_ENTRY or
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in a SYSCALL_RETURN event.
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Values:
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- TARGET_WAITKIND_SYSCALL_ENTRY
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- TARGET_WAITKIND_SYSCALL_RETURN */
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int syscall_state;
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/* The processor core this LWP was last seen on. */
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int core;
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/* Next LWP in list. */
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struct lwp_info *next;
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};
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/* The global list of LWPs, for ALL_LWPS. Unlike the threads list,
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there is always at least one LWP on the list while the GNU/Linux
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native target is active. */
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extern struct lwp_info *lwp_list;
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/* Iterate over the PTID each active thread (light-weight process). There
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must be at least one. */
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#define ALL_LWPS(LP, PTID) \
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for ((LP) = lwp_list, (PTID) = (LP)->ptid; \
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(LP) != NULL; \
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(LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
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#define GET_LWP(ptid) ptid_get_lwp (ptid)
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#define GET_PID(ptid) ptid_get_pid (ptid)
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#define is_lwp(ptid) (GET_LWP (ptid) != 0)
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#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
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/* Attempt to initialize libthread_db. */
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void check_for_thread_db (void);
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int thread_db_attach_lwp (ptid_t ptid);
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/* Return the set of signals used by the threads library. */
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extern void lin_thread_get_thread_signals (sigset_t *mask);
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/* Find process PID's pending signal set from /proc/pid/status. */
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void linux_proc_pending_signals (int pid, sigset_t *pending,
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sigset_t *blocked, sigset_t *ignored);
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/* linux-nat functions for handling fork events. */
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extern void linux_enable_event_reporting (ptid_t ptid);
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extern int lin_lwp_attach_lwp (ptid_t ptid);
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/* Iterator function for lin-lwp's lwp list. */
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struct lwp_info *iterate_over_lwps (ptid_t filter,
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int (*callback) (struct lwp_info *,
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void *),
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void *data);
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/* Create a prototype generic GNU/Linux target. The client can
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override it with local methods. */
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struct target_ops * linux_target (void);
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/* Create a generic GNU/Linux target using traditional
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ptrace register access. */
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struct target_ops *
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linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
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/* Register the customized GNU/Linux target. This should be used
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instead of calling add_target directly. */
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void linux_nat_add_target (struct target_ops *);
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/* Register a method to call whenever a new thread is attached. */
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void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
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/* Register a method that converts a siginfo object between the layout
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that ptrace returns, and the layout in the architecture of the
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inferior. */
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void linux_nat_set_siginfo_fixup (struct target_ops *,
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int (*) (struct siginfo *,
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gdb_byte *,
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int));
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/* Update linux-nat internal state when changing from one fork
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to another. */
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void linux_nat_switch_fork (ptid_t new_ptid);
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/* Return the saved siginfo associated with PTID. */
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struct siginfo *linux_nat_get_siginfo (ptid_t ptid);
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/* Compute and return the processor core of a given thread. */
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int linux_nat_core_of_thread_1 (ptid_t ptid);
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/* Set alternative SIGTRAP-like events recognizer. */
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void linux_nat_set_status_is_event (struct target_ops *t,
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int (*status_is_event) (int status));
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