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Annotation of 43BSDTahoe/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 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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