1 1.6 skrll /* $NetBSD: sbrk.S,v 1.6 2023/05/07 12:41:47 skrll Exp $ */ 2 1.1 matt 3 1.1 matt /*- 4 1.1 matt * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 1.1 matt * All rights reserved. 6 1.1 matt * 7 1.1 matt * This code is derived from software contributed to The NetBSD Foundation 8 1.1 matt * by Matt Thomas of 3am Software Foundry. 9 1.1 matt * 10 1.1 matt * Redistribution and use in source and binary forms, with or without 11 1.1 matt * modification, are permitted provided that the following conditions 12 1.1 matt * are met: 13 1.1 matt * 1. Redistributions of source code must retain the above copyright 14 1.1 matt * notice, this list of conditions and the following disclaimer. 15 1.1 matt * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 matt * notice, this list of conditions and the following disclaimer in the 17 1.1 matt * documentation and/or other materials provided with the distribution. 18 1.1 matt * 19 1.1 matt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1 matt * POSSIBILITY OF SUCH DAMAGE. 30 1.1 matt */ 31 1.1 matt 32 1.1 matt #include "SYS.h" 33 1.1 matt 34 1.1 matt .hidden _C_LABEL(__curbrk) 35 1.1 matt .globl _C_LABEL(__curbrk) 36 1.1 matt 37 1.1 matt #ifdef WEAK_ALIAS 38 1.1 matt WEAK_ALIAS(sbrk, _sbrk) 39 1.1 matt #endif 40 1.1 matt 41 1.1 matt ENTRY(_sbrk) 42 1.4 matt lla t1, _C_LABEL(__curbrk) 43 1.1 matt PTR_L t2, 0(t1) 44 1.1 matt add a0, a0, t2 // compute current break 45 1.6 skrll mv t5, a0 // save for success 46 1.1 matt SYSTRAP(break) 47 1.1 matt JUMP_TO_CERROR() /* error */ 48 1.6 skrll PTR_S t5, 0(t1) // save new val of curbrk from above 49 1.5 skrll mv a0, t2 // return old val of curbrk from above 50 1.1 matt ret 51 1.1 matt END(_sbrk) 52