1/* $NetBSD: sbrk.S,v 1.14 2002/11/10 18:10:26 thorpej 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: @(#)sbrk.s 8.1 (Berkeley) 6/4/93") 43 ASMSTR("$NetBSD: sbrk.S,v 1.14 2002/11/10 18:10:26 thorpej Exp $") 44#endif /* LIBC_SCCS and not lint */ 45 46 .globl _C_LABEL(__curbrk) 47 .globl _C_LABEL(_end) 48 49#ifdef WEAK_ALIAS 50WEAK_ALIAS(sbrk, _sbrk) 51#endif 52 53 .data 54_C_LABEL(__curbrk): 55 .word _C_LABEL(_end) 56 .text 57 58LEAF(_sbrk) 59#ifdef __ABICALLS__ 60 .set noreorder 61 .cpload t9 62 .set reorder 63#endif 64 lw v1, _C_LABEL(__curbrk) 65 li v0, SYS_break 66 addu a0, a0, v1 # compute current break 67 syscall 68 bne a3, zero, 1f 69 move v0, v1 # return old val of curbrk from above 70 sw a0, _C_LABEL(__curbrk) # save current val of curbrk from above 71 j ra 721: 73 la t9, _C_LABEL(__cerror) 74 jr t9 75END(sbrk) 76