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