syscall.c

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/*
 * Copyright (C) 2006 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <libc.h>

sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2, const sysarg_t p3, const sysarg_t p4, const syscall_t id)
{
        register sysarg_t __ppc32_reg_r3 asm("3") = p1;
        register sysarg_t __ppc32_reg_r4 asm("4") = p2;
        register sysarg_t __ppc32_reg_r5 asm("5") = p3;
        register sysarg_t __ppc32_reg_r6 asm("6") = p4;
        register sysarg_t __ppc32_reg_r7 asm("7") = id;
        
        asm volatile (
                "sc\n"
                : "=r" (__ppc32_reg_r3)
                : "r" (__ppc32_reg_r3),
                  "r" (__ppc32_reg_r4),
                  "r" (__ppc32_reg_r5),
                  "r" (__ppc32_reg_r6),
                  "r" (__ppc32_reg_r7)
        );
        
        return __ppc32_reg_r3;
}

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