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Annotation of 43BSDReno/lib/libc/i386/gen/alloca.s, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1990 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * William Jolitz.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted
                      9:  * provided that: (1) source distributions retain this entire copyright
                     10:  * notice and comment, and (2) distributions including binaries display
                     11:  * the following acknowledgement:  ``This product includes software
                     12:  * developed by the University of California, Berkeley and its contributors''
                     13:  * in the documentation or other materials provided with the distribution
                     14:  * and in all advertising materials mentioning features or use of this
                     15:  * software. Neither the name of the University nor the names of its
                     16:  * contributors may be used to endorse or promote products derived
                     17:  * from this software without specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #if defined(LIBC_SCCS) && !defined(lint)
                     24:        .asciz "@(#)alloca.s    5.2 (Berkeley) 5/14/90"
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: /* like alloc, but automatic automatic free in return */
                     28: 
                     29: #include "DEFS.h"
                     30: 
                     31: ENTRY(alloca)
                     32:        popl    %edx            /*  pop return addr */
                     33:        popl    %eax            /*  pop amount to allocate */
                     34:        movl    %esp,%ecx
                     35:        addl    $3,%eax         /*  round up to next word */
                     36:        andl    $0xfffffffc,%eax
                     37:        subl    %eax,%esp
                     38:        movl    %esp,%eax       /* base of newly allocated space */
                     39:        pushl   8(%ecx)         /* copy possible saved registers */
                     40:        pushl   4(%ecx)
                     41:        pushl   0(%ecx)
                     42:        pushl   %eax            /* dummy to pop at callsite */
                     43:        jmp     %edx            /* "return" */

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