usr/src/lib/libc/vax/sys/brk.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 the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(SYSLIBC_SCCS) && !defined(lint)
        .asciz "@(#)brk.s       5.5 (Berkeley) 6/27/88"
#endif /* SYSLIBC_SCCS and not lint */

#include "SYS.h"

#define SYS_brk         17

        .globl  curbrk
        .globl  minbrk
ENTRY(_brk)
        jbr     ok

ENTRY(brk)
        cmpl    4(ap),minbrk
        bgeq    ok
        movl    minbrk,4(ap)
ok:
        chmk    $SYS_brk
        jcs     err
        movl    4(ap),curbrk
        clrl    r0
        ret
err:
        jmp     cerror