usr/src/lib/libc/tahoe/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 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  "@(#)brk.s      5.2 (Berkeley) %G%"
#endif /* SYSLIBC_SCCS and not lint */

#include "SYS.h"

#define SYS_brk         17

        .globl  curbrk
        .globl  minbrk

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