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  1. /*
  2.  * Copyright (c) 2005 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29.  /** @addtogroup libcmips32
  30.  * @{
  31.  */
  32. /** @file
  33.   * @ingroup libcmips32eb  
  34.  */
  35.  
  36. #include <libc.h>
  37.  
  38. sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2,
  39.            const sysarg_t p3, const sysarg_t p4,
  40.            const syscall_t id)
  41. {
  42.     register sysarg_t __mips_reg_a0 asm("$4") = p1;
  43.     register sysarg_t __mips_reg_a1 asm("$5") = p2;
  44.     register sysarg_t __mips_reg_a2 asm("$6") = p3;
  45.     register sysarg_t __mips_reg_a3 asm("$7") = p4;
  46.     register sysarg_t __mips_reg_v0 asm("$2") = id;
  47.    
  48.     asm volatile (
  49.         "syscall\n"
  50.         : "=r" (__mips_reg_v0)
  51.         : "r" (__mips_reg_a0),
  52.           "r" (__mips_reg_a1),
  53.           "r" (__mips_reg_a2),
  54.           "r" (__mips_reg_a3),
  55.           "r" (__mips_reg_v0)
  56.         : "%ra" /* We are a function call, although C does not
  57.              * know it */
  58.     );
  59.    
  60.     return __mips_reg_v0;
  61. }
  62.  
  63.  /** @}
  64.  */
  65.  
  66.