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Annotation of src/sys/kern/sys_syscall.c, Revision 1.1

1.1     ! dsl         1: /*     $NetBSD$        */
        !             2:
        !             3: /*-
        !             4:  * Copyright (c) 2006 The NetBSD Foundation, Inc.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to The NetBSD Foundation
        !             8:  * by David Laight.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. Neither the name of The NetBSD Foundation nor the names of its
        !            19:  *    contributors may be used to endorse or promote products derived
        !            20:  *    from this software without specific prior written permission.
        !            21:  *
        !            22:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            23:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            24:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            25:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            26:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            27:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            28:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            29:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            30:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            31:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            32:  * POSSIBILITY OF SUCH DAMAGE.
        !            33:  */
        !            34:
        !            35: #include <sys/cdefs.h>
        !            36: __RCSID("$NetBSD$");
        !            37:
        !            38: #include <sys/syscall_stats.h>
        !            39:
        !            40: /*
        !            41:  * MI indirect system call support.
        !            42:  * Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c
        !            43:  *
        !            44:  * SYS_SYSCALL is set to the required function name.
        !            45:  */
        !            46:
        !            47: #define CONCAT(a,b) __CONCAT(a,b)
        !            48:
        !            49: int
        !            50: SYS_SYSCALL(struct lwp *l, void *v, register_t *rval)
        !            51: {
        !            52:        struct CONCAT(SYS_SYSCALL, _args) /* {
        !            53:                syscallarg(int) code;
        !            54:                syscallarg(register_t) args[SYS_MAXSYSARGS];
        !            55:        } */ *uap = v;
        !            56:        const struct sysent *callp;
        !            57:        struct proc *p = l->l_proc;
        !            58:        int code;
        !            59:        int error;
        !            60: #ifdef NETBSD32_SYSCALL
        !            61:        register_t args64[SYS_MAXSYSARGS];
        !            62:        int i, narg;
        !            63:        #define TRACE_ARGS args64
        !            64: #else
        !            65:        #define TRACE_ARGS &uap->args
        !            66: #endif
        !            67:
        !            68:        callp = p->p_emul->e_sysent;
        !            69:
        !            70:        code = SCARG(uap, code) & (SYS_NSYSENT - 1);
        !            71:        SYSCALL_COUNT(syscall_counts, code);
        !            72:        callp += code;
        !            73:
        !            74:        if (__predict_false(callp->sy_flags & SYCALL_INDIRECT))
        !            75:                return ENOSYS;
        !            76:
        !            77:        if (__predict_true(!p->p_trace_enabled))
        !            78:                return callp->sy_call(l, &uap->args, rval);
        !            79:
        !            80: #ifdef NETBSD32_SYSCALL
        !            81:        narg = callp->sy_argsize >> 2;
        !            82:        for (i = 0; i < narg; i++)
        !            83:                args64[i] = SCARG(uap, args[i]);
        !            84:        /* XXX systrace will not modify the correct arguments! */
        !            85: #endif
        !            86:
        !            87:        error = trace_enter(l, code, code, NULL, TRACE_ARGS);
        !            88:        if (__predict_false(error != 0))
        !            89:                return error;
        !            90:        error = callp->sy_call(l, &uap->args, rval);
        !            91:        trace_exit(l, code, TRACE_ARGS, rval, error);
        !            92:        return error;
        !            93:
        !            94:        #undef TRACE_ARGS
        !            95: }

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