FreeBSD/Linux Kernel Cross Reference
sys/sys/syscallvar.h

     /*      $NetBSD: syscallvar.h,v 1.12 2018/04/19 21:19:07 christos Exp $ */
     
     /*-
      * Copyright (c) 2008 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software developed for The NetBSD Foundation
      * by Andrew Doran.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _SYS_SYSCALLVAR_H_
    #define _SYS_SYSCALLVAR_H_
    
    #ifndef _KERNEL
    #error nothing of interest to userspace here
    #endif
    
    #if defined(_KERNEL) && defined(_KERNEL_OPT)
    #include "opt_dtrace.h"
    #endif
    
    #include <sys/systm.h>
    #include <sys/proc.h>
    
    extern struct emul emul_netbsd;
    
    struct syscall_package {
            u_short         sp_code;
            u_short         sp_flags;
            sy_call_t       *sp_call;
    };
    
    void    syscall_init(void);
    int     syscall_establish(const struct emul *, const struct syscall_package *);
    int     syscall_disestablish(const struct emul *, const struct syscall_package *);
    
    static __inline int
    sy_call(const struct sysent *sy, struct lwp *l, const void *uap,
            register_t *rval)
    {
            int error;
    
            l->l_sysent = sy;
            error = (*sy->sy_call)(l, uap, rval);
            l->l_sysent = NULL;
    
            return error;
    }
    
    static __inline int
    sy_invoke(const struct sysent *sy, struct lwp *l, const void *uap,
            register_t *rval, int code)
    {
            const bool do_trace = l->l_proc->p_trace_enabled &&
                (sy->sy_flags & SYCALL_INDIRECT) == 0;
            int error;
    
    #ifdef KDTRACE_HOOKS
    #define KDTRACE_ENTRY(a)        (a)
    #else
    #define KDTRACE_ENTRY(a)        (0)
    #endif
            if (__predict_true(!(do_trace || KDTRACE_ENTRY(sy->sy_entry)))
                || (error = trace_enter(code, sy, uap)) == 0) {
                    rval[0] = 0;
    #if !defined(__mips__) && !defined(__m68k__)
                    /*
                     * Due to the mips userland code for SYS_break needing v1 to be
                     * preserved, we can't clear this on mips. 
                     */
                    rval[1] = 0;
    #endif
                    error = sy_call(sy, l, uap, rval);
            }
    
            if (__predict_false(do_trace || KDTRACE_ENTRY(sy->sy_return))) {
                    trace_exit(code, sy, uap, rval, error);
            }
           return error;
   }
   
   /* inclusion in the kernel currently depends on SYSCALL_DEBUG */
   extern const char * const syscallnames[];
   extern const char * const altsyscallnames[];
   
   #endif  /* _SYS_SYSCALLVAR_H_ */

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