1/* $NetBSD: brk.S,v 1.13 2000/12/13 23:29:06 simonb Exp $ */ 2 3/*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39#include "SYS.h" 40 41#if defined(LIBC_SCCS) && !defined(lint) 42 ASMSTR("from: @(#)brk.s 8.1 (Berkeley) 6/4/93") 43 ASMSTR("$NetBSD: brk.S,v 1.13 2000/12/13 23:29:06 simonb Exp $") 44#endif /* LIBC_SCCS and not lint */ 45 46 .globl _C_LABEL(__minbrk) 47 .globl _C_LABEL(__curbrk) 48 .globl _C_LABEL(_end) 49 50#ifdef WEAK_ALIAS 51WEAK_ALIAS(brk, _brk) 52#endif 53 54 .data 55_C_LABEL(__minbrk): 56 .word _C_LABEL(_end) 57 .text 58 59LEAF(_brk) 60#ifdef ABICALLS 61 .set noreorder 62 .cpload t9 63 .set reorder 64#endif 65 lw v0, _C_LABEL(__minbrk) 66 bgeu a0, v0, 1f 67 move a0, v0 # dont allow break < minbrk 681: 69 li v0, SYS_break 70 syscall 71 bne a3, zero, 2f 72 sw a0, _C_LABEL(__curbrk) 73 move v0, zero 74 j ra 752: 76 la t9, _C_LABEL(__cerror) 77 jr t9 78END(brk) 79