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  1. /*
  2.  * Copyright (C) 2006 Jakub Jermar
  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. #include <libc.h>
  30.  
  31. /**
  32.  * Immediate operand for break instruction.
  33.  * Be carefull about the value as Ski simulator
  34.  * is somewhat sensitive to its value.
  35.  *
  36.  * 0 will be confused with Ski breakpoint.
  37.  * And higher values will be confused with SSC's.
  38.  */
  39. #define SYSCALL_IMM 1
  40.  
  41. sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3)
  42. {
  43.     sysarg_t ret;
  44.    
  45.     __asm__ volatile (
  46.         "mov r14 = %1\n"
  47.         "mov r15 = %2\n"
  48.         "mov r16 = %3\n"
  49.         "mov r17 = %4\n"
  50.         "break %5\n"
  51.         "mov %0 = r8\n"
  52.         : "=r" (ret)
  53.         : "r" (id), "r" (p1), "r" (p2), "r" (p3), "i" (SYSCALL_IMM)
  54.         : "r8", "r14", "r15", "r16"
  55.     );
  56.    
  57.     return ret;
  58. }
  59.