1/* $NetBSD: sbrk.S,v 1.9 2003/08/07 16:42:26 agc Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 36 */ 37 38#include <machine/asm.h> 39#if defined(SYSLIBC_SCCS) && !defined(lint) 40#if 0 41 .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 42#else 43 RCSID("$NetBSD: sbrk.S,v 1.9 2003/08/07 16:42:26 agc Exp $") 44#endif 45#endif /* SYSLIBC_SCCS and not lint */ 46 47#include "SYS.h" 48 49 .globl _end 50 .globl CURBRK 51 52#ifdef WEAK_ALIAS 53WEAK_ALIAS(sbrk, _sbrk) 54#endif 55 56 .data 57CURBRK: .long _end 58 .text 59 60ENTRY(_sbrk) 61#ifdef PIC 62 PIC_PROLOGUE(%o5,%o4) 63 ld [%o5 + CURBRK], %o2 64 ld [%o2], %o3 ! %o3 = old break 65 add %o3, %o0, %o4 ! %o4 = new break 66 mov %o4, %o0 ! copy for syscall 67 mov SYS_break, %g1 68 t ST_SYSCALL ! break(new_break) 69 bcc,a 1f ! if success, 70 mov %o3, %o0 ! set return value 71 ERROR() 721: 73 retl ! and update curbrk 74 st %o4, [%o2] 75#else 76 sethi %hi(CURBRK), %o2 77 ld [%o2 + %lo(CURBRK)], %o3 ! %o3 = old break 78 add %o3, %o0, %o4 ! %o4 = new break 79 mov %o4, %o0 ! copy for syscall 80 mov SYS_break, %g1 81 t ST_SYSCALL ! break(new_break) 82 bcc,a 1f ! if success, 83 mov %o3, %o0 ! set return value 84 ERROR() 851: 86 retl ! and update curbrk 87 st %o4, [%o2 + %lo(CURBRK)] 88#endif 89