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Annotation of 43BSDTahoe/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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            19:        .asciz "@(#)syscall.s   5.3 (Berkeley) 6/27/88"
        !            20: #endif /* SYSLIBC_SCCS and not lint */
        !            21: 
        !            22: #include "SYS.h"
        !            23: 
        !            24: ENTRY(syscall)
        !            25:        pushl   4(fp)           # syscall number
        !            26:        movl    fp,r0           # point to the arg list
        !            27:        movl    -4(fp),r1       # (arg_count + 1) (bytes) | mask
        !            28:        andl2   $0xFFFF,r1      # clear the mask bits
        !            29:        shrl    $2,r1,r1        # convert to words
        !            30:        subl2   $2,r1           # don't count the first arg
        !            31: 1:
        !            32:        addl2   $4,r0           # point to the next arg
        !            33:        movl    4(r0),(r0)      # move an arg down
        !            34:        decl    r1              # count it
        !            35:        jgtr    1b              # any more?
        !            36:        movl    (sp)+,r0        # no, get the syscall number back
        !            37:        kcall   r0
        !            38:        jcs     1f
        !            39:        ret
        !            40: 1:
        !            41:        jmp     cerror

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