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Annotation of sys/arch/i386/stand/libsa/unixsys.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: unixsys.S,v 1.4 2004/01/13 23:54:07 millert Exp $     */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1997 Michael Shalayeff
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            18:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            19:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            20:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            21:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            22:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            24:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            25:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            26:  * SUCH DAMAGE.
        !            27:  *
        !            28:  */
        !            29:
        !            30: #include <machine/asm.h>
        !            31: #include <sys/syscall.h>
        !            32:
        !            33:
        !            34: #ifdef __STDC__
        !            35: #define RSYSCALL(x) \
        !            36:        ENTRY(u##x); \
        !            37:                movl     $(SYS_##x), %eax; \
        !            38:                jmp      1f
        !            39: #else
        !            40: #define RSYSCALL(x) \
        !            41:        ENTRY(u/**/x); \
        !            42:                movl     $(SYS_/**/x), %eax; \
        !            43:                jmp      1f
        !            44: #endif
        !            45:
        !            46:        .globl  _errno
        !            47:
        !            48: RSYSCALL(open)
        !            49: RSYSCALL(read)
        !            50: RSYSCALL(write)
        !            51: RSYSCALL(ioctl)
        !            52: RSYSCALL(close)
        !            53: RSYSCALL(exit)
        !            54:
        !            55: 1:
        !            56:        int     $0x80
        !            57: 2:     jnc     3f
        !            58:        movl    %eax, _errno
        !            59:        movl    $-1, %eax
        !            60:        movl    $-1, %edx
        !            61: 3:     ret
        !            62:
        !            63: ENTRY(__syscall)
        !            64:        movl    $(SYS___syscall), %eax
        !            65:        jmp     1b
        !            66:
        !            67: ENTRY(syscall)
        !            68:        popl    %ecx    /* rta */
        !            69:        popl    %eax    /* syscall number */
        !            70:        pushl   %ecx
        !            71:        int     $0x80
        !            72:        pushl   %ecx
        !            73:        jmp     2b