1/* $NetBSD: brk.S,v 1.4 2015/03/31 11:59:41 matt Exp $ */ 2 3/*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33 34#if defined(LIBC_SCCS) && !defined(lint) 35 RCSID("$NetBSD: brk.S,v 1.4 2015/03/31 11:59:41 matt Exp $") 36#endif /* LIBC_SCCS and not lint */ 37 38 .hidden _C_LABEL(__minbrk) 39 .hidden _C_LABEL(__curbrk) 40 .globl _C_LABEL(__minbrk) 41 .globl _C_LABEL(__curbrk) 42 .globl _C_LABEL(_end) 43 44#ifdef WEAK_ALIAS 45WEAK_ALIAS(brk, _brk) 46#endif 47 48 .data 49 .p2align PTR_SCALESHIFT 50_C_LABEL(__minbrk): 51 PTR_WORD _C_LABEL(_end) 52_C_LABEL(__curbrk): 53 PTR_WORD _C_LABEL(_end) 54 55 .text 56 57ENTRY(_brk) 58 lla t1, _C_LABEL(__minbrk) 59 PTR_L t5, 0(t1) 60 bgeu a0, t5, 1f 61 move a0, t5 # dont allow break < minbrk 621: 63 SYSTRAP(break) 64 JUMP_TO_CERROR() /* error */ 65 PTR_S a0, __SIZEOF_POINTER__(t1) /* success */ 66 move a0, zero 67 ret 68END(_brk) 69