1/* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 38 * $Id: sbrk.S,v 1.2 1994/02/10 20:16:01 pk Exp $ 39 */ 40 41#if defined(LIBC_SCCS) && !defined(lint) 42 .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 43#endif /* LIBC_SCCS and not lint */ 44 45#include "SYS.h" 46 47 .globl _end 48 .globl curbrk 49 50 .data 51curbrk: .long _end 52 .text 53 54ENTRY(sbrk) 55#ifdef PIC 56 PIC_PROLOGUE(%o5,%o4) 57 ld [%o5 + curbrk], %o2 58 ld [%o2], %o3 ! %o3 = old break 59 add %o3, %o0, %o4 ! %o4 = new break 60 mov %o4, %o0 ! copy for syscall 61 mov SYS_break, %g1 62 t ST_SYSCALL ! break(new_break) 63 bcc,a 1f ! if success, 64 mov %o3, %o0 ! set return value 65 ERROR() 661: 67 retl ! and update curbrk 68 st %o4, [%o2] 69#else 70 sethi %hi(curbrk), %o2 71 ld [%o2 + %lo(curbrk)], %o3 ! %o3 = old break 72 add %o3, %o0, %o4 ! %o4 = new break 73 mov %o4, %o0 ! copy for syscall 74 mov SYS_break, %g1 75 t ST_SYSCALL ! break(new_break) 76 bcc,a 1f ! if success, 77 mov %o3, %o0 ! set return value 78 ERROR() 791: 80 retl ! and update curbrk 81 st %o4, [%o2 + %lo(curbrk)] 82#endif 83