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Annotation of 43BSDReno/lib/libc/tahoe/sys/syscall.s, revision 1.1.1.1

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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