1/* $NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include "SYS.h" 36 37#if defined(LIBC_SCCS) && !defined(lint) 38 ASMSTR("from: @(#)sbrk.s 8.1 (Berkeley) 6/4/93") 39 ASMSTR("$NetBSD: sbrk.S,v 1.16 2005/04/22 06:58:01 simonb Exp $") 40#endif /* LIBC_SCCS and not lint */ 41 42 .globl _C_LABEL(__curbrk) 43 .globl _C_LABEL(_end) 44 45#ifdef WEAK_ALIAS 46WEAK_ALIAS(sbrk, _sbrk) 47#endif 48 49 .data 50_C_LABEL(__curbrk): 51 .word _C_LABEL(_end) 52 .text 53 54LEAF(_sbrk) 55#ifdef __ABICALLS__ 56 .set noreorder 57 .cpload t9 58 .set reorder 59#endif 60 lw v1, _C_LABEL(__curbrk) 61 li v0, SYS_break 62 addu a0, a0, v1 # compute current break 63 syscall 64 bne a3, zero, 1f 65 move v0, v1 # return old val of curbrk from above 66 sw a0, _C_LABEL(__curbrk) # save current val of curbrk from above 67 j ra 681: 69 la t9, _C_LABEL(__cerror) 70 jr t9 71END(_sbrk) 72