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Annotation of 43BSDReno/lib/libc/tahoe/sys/syscall.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            21:        .asciz "@(#)syscall.s   5.4 (Berkeley) 6/1/90"
        !            22: #endif /* SYSLIBC_SCCS and not lint */
        !            23: 
        !            24: #include "SYS.h"
        !            25: 
        !            26: ENTRY(syscall)
        !            27:        pushl   4(fp)           # syscall number
        !            28:        movl    fp,r0           # point to the arg list
        !            29:        movl    -4(fp),r1       # (arg_count + 1) (bytes) | mask
        !            30:        andl2   $0xFFFF,r1      # clear the mask bits
        !            31:        shrl    $2,r1,r1        # convert to words
        !            32:        subl2   $2,r1           # don't count the first arg
        !            33: 1:
        !            34:        addl2   $4,r0           # point to the next arg
        !            35:        movl    4(r0),(r0)      # move an arg down
        !            36:        decl    r1              # count it
        !            37:        jgtr    1b              # any more?
        !            38:        movl    (sp)+,r0        # no, get the syscall number back
        !            39:        kcall   r0
        !            40:        jcs     1f
        !            41:        ret
        !            42: 1:
        !            43:        jmp     cerror

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