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82075af2c1
This adds a new QCatchSyscalls packet to enable 'catch syscall', and new stop reasons "syscall_entry" and "syscall_return" for those events. It is currently only supported on Linux x86 and x86_64. gdb/ChangeLog: 2016-01-12 Josh Stone <jistone@redhat.com> Philippe Waroquiers <philippe.waroquiers@skynet.be> * NEWS (Changes since GDB 7.10): Mention QCatchSyscalls and the syscall_entry and syscall_return stop reasons. Mention GDB support for remote catch syscall. * remote.c (PACKET_QCatchSyscalls): New enum. (remote_set_syscall_catchpoint): New function. (remote_protocol_features): New element for QCatchSyscalls. (remote_parse_stop_reply): Parse syscall_entry/return stops. (init_remote_ops): Install remote_set_syscall_catchpoint. (_initialize_remote): Config QCatchSyscalls. * linux-nat.h (struct lwp_info) <syscall_state>: Comment typo. gdb/doc/ChangeLog: 2016-01-12 Josh Stone <jistone@redhat.com> Philippe Waroquiers <philippe.waroquiers@skynet.be> * gdb.texinfo (Remote Configuration): List the QCatchSyscalls packet. (Stop Reply Packets): List the syscall entry and return stop reasons. (General Query Packets): Describe QCatchSyscalls, and add it to the table and the detailed list of stub features. gdb/gdbserver/ChangeLog: 2016-01-12 Josh Stone <jistone@redhat.com> Philippe Waroquiers <philippe.waroquiers@skynet.be> * inferiors.h: Include "gdb_vecs.h". (struct process_info): Add syscalls_to_catch. * inferiors.c (remove_process): Free syscalls_to_catch. * remote-utils.c (prepare_resume_reply): Report syscall_entry and syscall_return stops. * server.h (UNKNOWN_SYSCALL, ANY_SYSCALL): Define. * server.c (handle_general_set): Handle QCatchSyscalls. (handle_query): Report support for QCatchSyscalls. * target.h (struct target_ops): Add supports_catch_syscall. (target_supports_catch_syscall): New macro. * linux-low.h (struct linux_target_ops): Add get_syscall_trapinfo. (struct lwp_info): Add syscall_state. * linux-low.c (handle_extended_wait): Mark syscall_state as an entry. Maintain syscall_state and syscalls_to_catch across exec. (get_syscall_trapinfo): New function, proxy to the_low_target. (linux_low_ptrace_options): Enable PTRACE_O_TRACESYSGOOD. (linux_low_filter_event): Toggle syscall_state entry/return for syscall traps, and set it ignored for all others. (gdb_catching_syscalls_p): New function. (gdb_catch_this_syscall_p): New function. (linux_wait_1): Handle SYSCALL_SIGTRAP. (linux_resume_one_lwp_throw): Add PTRACE_SYSCALL possibility. (linux_supports_catch_syscall): New function. (linux_target_ops): Install it. * linux-x86-low.c (x86_get_syscall_trapinfo): New function. (the_low_target): Install it. gdb/testsuite/ChangeLog: 2016-01-12 Josh Stone <jistone@redhat.com> Philippe Waroquiers <philippe.waroquiers@skynet.be> * gdb.base/catch-syscall.c (do_execve): New variable. (main): Conditionally trigger an execve. * gdb.base/catch-syscall.exp: Enable testing for remote targets. (test_catch_syscall_execve): New, check entry/return across execve. (do_syscall_tests): Call test_catch_syscall_execve.
208 lines
7.4 KiB
C
208 lines
7.4 KiB
C
/* Native debugging support for GNU/Linux (LWP layer).
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Copyright (C) 2000-2016 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 "nat/linux-nat.h"
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#include "target.h"
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#include <signal.h>
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struct arch_lwp_info;
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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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/* If this flag is set, we need to set the event request flags the
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next time we see this LWP stop. */
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int must_set_ptrace_flags;
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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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/* When 'stopped' is set, this is where the lwp last stopped, with
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decr_pc_after_break already accounted for. If the LWP is
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running, and stepping, this is the address at which the lwp was
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resumed (that is, it's the previous stop PC). If the LWP is
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running and not stepping, this is 0. */
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CORE_ADDR stop_pc;
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/* Non-zero if we were stepping this LWP. */
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int step;
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/* The reason the LWP last stopped, if we need to track it
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(breakpoint, watchpoint, etc.) */
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enum target_stop_reason stop_reason;
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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 whether 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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enum target_waitkind 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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/* Arch-specific additions. */
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struct arch_lwp_info *arch_private;
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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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/* Does the current host support PTRACE_GETREGSET? */
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extern enum tribool have_ptrace_getregset;
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/* Iterate over each active thread (light-weight process). */
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#define ALL_LWPS(LP) \
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for ((LP) = lwp_list; \
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(LP) != NULL; \
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(LP) = (LP)->next)
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/* Attempt to initialize libthread_db. */
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void check_for_thread_db (void);
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/* Called from the LWP layer to inform the thread_db layer that PARENT
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spawned CHILD. Both LWPs are currently stopped. This function
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does whatever is required to have the child LWP under the
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thread_db's control --- e.g., enabling event reporting. Returns
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true on success, false if the process isn't using libpthread. */
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extern int thread_db_notice_clone (ptid_t parent, ptid_t child);
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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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/* For linux_stop_lwp see nat/linux-nat.h. */
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/* Stop all LWPs, synchronously. (Any events that trigger while LWPs
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are being stopped are left pending.) */
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extern void linux_stop_and_wait_all_lwps (void);
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/* Set resumed LWPs running again, as they were before being stopped
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with linux_stop_and_wait_all_lwps. (LWPS with pending events are
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left stopped.) */
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extern void linux_unstop_all_lwps (void);
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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 (*) (struct lwp_info *));
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/* Register a method to call whenever a new fork is attached. */
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typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
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pid_t child_pid);
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void linux_nat_set_new_fork (struct target_ops *ops,
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linux_nat_new_fork_ftype *fn);
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/* Register a method to call whenever a process is killed or
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detached. */
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typedef void (linux_nat_forget_process_ftype) (pid_t pid);
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void linux_nat_set_forget_process (struct target_ops *ops,
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linux_nat_forget_process_ftype *fn);
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/* Call the method registered with the function above. PID is the
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process to forget about. */
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void linux_nat_forget_process (pid_t pid);
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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 (*) (siginfo_t *,
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gdb_byte *,
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int));
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/* Register a method to call prior to resuming a thread. */
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void linux_nat_set_prepare_to_resume (struct target_ops *,
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void (*) (struct lwp_info *));
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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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/* Store the saved siginfo associated with PTID in *SIGINFO.
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Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
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uninitialized in such case). */
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int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
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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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