FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_syscall.c

     /*      $NetBSD: sys_syscall.c,v 1.15 2022/06/29 16:33:09 hannken Exp $ */
     
     /*-
      * Copyright (c) 2006 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by David Laight.
      *
     * 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.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: sys_syscall.c,v 1.15 2022/06/29 16:33:09 hannken Exp $");
    
    #include <sys/syscall_stats.h>
    #include <sys/syscallvar.h>
    
    /*
     * MI indirect system call support.
     * Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c
     *
     * SYS_SYSCALL is set to the required function name.
     */
    
    #define CONCAT(a,b) __CONCAT(a,b)
    
    static void
    CONCAT(SYS_SYSCALL, _biglockcheck)(struct proc *p, int code)
    {
    
    #ifdef DIAGNOSTIC
           kpreempt_disable();     /* make curcpu() stable */
           KASSERTMSG(curcpu()->ci_biglock_count == 0,
               "syscall %ld of emul %s leaked %d kernel locks",
               (long)code, p->p_emul->e_name, curcpu()->ci_biglock_count);
           kpreempt_enable();
    #endif
    }
    
    int
    SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap,
        register_t *rval)
    {
            /* {
                    syscallarg(int) code;
                    syscallarg(register_t) args[SYS_MAXSYSARGS];
            } */
            const struct sysent *callp;
            struct proc *p = l->l_proc;
            int code;
            int error;
    #ifdef NETBSD32_SYSCALL
            register_t args64[SYS_MAXSYSARGS];
            int i, narg;
            #define TRACE_ARGS args64
    #else
            #define TRACE_ARGS &SCARG(uap, args[0])
    #endif
    
            callp = p->p_emul->e_sysent;
    
            code = SCARG(uap, code) & (SYS_NSYSENT - 1);
            SYSCALL_COUNT(syscall_counts, code);
            callp += code;
    
            if (__predict_false(callp->sy_flags & SYCALL_INDIRECT))
                    return ENOSYS;
    
            if (__predict_true(!p->p_trace_enabled)) {
                    error = sy_call(callp, l, &uap->args, rval);
                    CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
                    return error;
            }
    
    #ifdef NETBSD32_SYSCALL
            narg = callp->sy_narg;
            for (i = 0; i < narg; i++)
                    args64[i] = SCARG(uap, args[i]);
    #endif
   
           error = trace_enter(code, callp, TRACE_ARGS);
           if (__predict_true(error == 0))
                   error = sy_call(callp, l, &uap->args, rval);
           trace_exit(code, callp, &uap->args, rval, error);
           CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
           return error;
   
           #undef TRACE_ARGS
   }

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