usr/src/lib/libc/vax/sys/sbrk.s

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific written prior permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#if defined(SYSLIBC_SCCS) && !defined(lint)
_sccsid:.asciz  "@(#)sbrk.s     5.4 (Berkeley) %G%"
#endif /* SYSLIBC_SCCS and not lint */

#include "SYS.h"

#define SYS_brk         17

        .globl  _end
        .globl  minbrk
        .globl  curbrk

        .data
minbrk: .long   _end
curbrk: .long   _end
        .text

ENTRY(sbrk)
        addl3   curbrk,4(ap),-(sp)
        pushl   $1
        movl    ap,r3
        movl    sp,ap
        chmk    $SYS_brk
        jcs     err
        movl    curbrk,r0
        addl2   4(r3),curbrk
        ret
err:
        jmp     cerror