UbixOS V2  2.0
sys_call.S
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1 /*-
2  * Copyright (c) 2002-2018 The UbixOS Project.
3  * All rights reserved.
4  *
5  * This was developed by Christopher W. Olsen for the UbixOS Project.
6  *
7  * Redistribution and use in source and binary forms, with or without modification, are permitted
8  * provided that the following conditions are met:
9  *
10  * 1) Redistributions of source code must retain the above copyright notice, this list of
11  * conditions, the following disclaimer and the list of authors.
12  * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13  * conditions, the following disclaimer and the list of authors in the documentation and/or
14  * other materials provided with the distribution.
15  * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16  * endorse or promote products derived from this software without specific prior written
17  * permission.
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19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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27  */
28 
29 .globl _sysCall
30 .text
31 .code32
32 _sysCall:
33  cmpl totalCalls,%eax
34  jae invalidSysCall
35 
36  cld
37  pushl %edx
38  pushl %ecx
39  pushl %ebx
40  call *systemCalls(,%eax,4)
41  popl %ebx
42  popl %ecx
43  popl %edx /* Restore Registers */
44 
45  iret
46 
47 invalidSysCall:
48  movl $-1,%eax
49  iret
50 
51 /***
52  END
53  ***/
54