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499 decky 1
/*
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 * Copyright (C) 2005 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <libc.h>
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954 palkovsky 31
sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2,
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           const sysarg_t p3, const syscall_t id)
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{
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    register sysarg_t __mips_reg_a0 asm("$4") = p1;
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    register sysarg_t __mips_reg_a1 asm("$5") = p2;
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    register sysarg_t __mips_reg_a2 asm("$6") = p3;
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    register sysarg_t __mips_reg_a3 asm("$7") = id;
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    register sysarg_t __mips_reg_v0 asm("$2");
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    asm volatile (
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        "syscall\n"
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        : "=r" (__mips_reg_v0)
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        : "r" (__mips_reg_a0),
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          "r" (__mips_reg_a1),
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          "r" (__mips_reg_a2),
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          "r" (__mips_reg_a3)
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    );
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    return __mips_reg_v0;
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}