1*84d9c625SLionel Sambuc/* $NetBSD: sbrk.S,v 1.11 2013/09/12 15:36:16 joerg Exp $ */ 22fe8fb19SBen Gras 32fe8fb19SBen Gras/* 42fe8fb19SBen Gras * Copyright (c) 1992, 1993 52fe8fb19SBen Gras * The Regents of the University of California. All rights reserved. 62fe8fb19SBen Gras * 72fe8fb19SBen Gras * This software was developed by the Computer Systems Engineering group 82fe8fb19SBen Gras * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 92fe8fb19SBen Gras * contributed to Berkeley. 102fe8fb19SBen Gras * 112fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 122fe8fb19SBen Gras * modification, are permitted provided that the following conditions 132fe8fb19SBen Gras * are met: 142fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 152fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 162fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 172fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 182fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 192fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors 202fe8fb19SBen Gras * may be used to endorse or promote products derived from this software 212fe8fb19SBen Gras * without specific prior written permission. 222fe8fb19SBen Gras * 232fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 242fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 252fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 262fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 272fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 282fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 292fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 302fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 312fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 322fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 332fe8fb19SBen Gras * SUCH DAMAGE. 342fe8fb19SBen Gras * 352fe8fb19SBen Gras * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 362fe8fb19SBen Gras */ 372fe8fb19SBen Gras 382fe8fb19SBen Gras#include <machine/asm.h> 392fe8fb19SBen Gras#if defined(SYSLIBC_SCCS) && !defined(lint) 402fe8fb19SBen Gras#if 0 412fe8fb19SBen Gras .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 422fe8fb19SBen Gras#else 43*84d9c625SLionel Sambuc RCSID("$NetBSD: sbrk.S,v 1.11 2013/09/12 15:36:16 joerg Exp $") 442fe8fb19SBen Gras#endif 452fe8fb19SBen Gras#endif /* SYSLIBC_SCCS and not lint */ 462fe8fb19SBen Gras 472fe8fb19SBen Gras#include "SYS.h" 482fe8fb19SBen Gras 492fe8fb19SBen Gras .globl _end 502fe8fb19SBen Gras .globl CURBRK 512fe8fb19SBen Gras 522fe8fb19SBen Gras#ifdef WEAK_ALIAS 532fe8fb19SBen GrasWEAK_ALIAS(sbrk, _sbrk) 542fe8fb19SBen Gras#endif 552fe8fb19SBen Gras 562fe8fb19SBen Gras .data 572fe8fb19SBen GrasCURBRK: .long _end 582fe8fb19SBen Gras .text 592fe8fb19SBen Gras 602fe8fb19SBen GrasENTRY(_sbrk) 61*84d9c625SLionel Sambuc#ifdef __PIC__ 622fe8fb19SBen Gras PIC_PROLOGUE(%o5,%o4) 632fe8fb19SBen Gras set CURBRK, %o2 642fe8fb19SBen Gras ld [%o5 + %o2], %o2 652fe8fb19SBen Gras ld [%o2], %o3 ! %o3 = old break 662fe8fb19SBen Gras add %o3, %o0, %o4 ! %o4 = new break 672fe8fb19SBen Gras mov %o4, %o0 ! copy for syscall 682fe8fb19SBen Gras mov SYS_break, %g1 692fe8fb19SBen Gras t ST_SYSCALL ! break(new_break) 702fe8fb19SBen Gras bcc,a 1f ! if success, 712fe8fb19SBen Gras mov %o3, %o0 ! set return value 722fe8fb19SBen Gras ERROR() 732fe8fb19SBen Gras1: 742fe8fb19SBen Gras retl ! and update curbrk 752fe8fb19SBen Gras st %o4, [%o2] 762fe8fb19SBen Gras#else 772fe8fb19SBen Gras sethi %hi(CURBRK), %o2 782fe8fb19SBen Gras ld [%o2 + %lo(CURBRK)], %o3 ! %o3 = old break 792fe8fb19SBen Gras add %o3, %o0, %o4 ! %o4 = new break 802fe8fb19SBen Gras mov %o4, %o0 ! copy for syscall 812fe8fb19SBen Gras mov SYS_break, %g1 822fe8fb19SBen Gras t ST_SYSCALL ! break(new_break) 832fe8fb19SBen Gras bcc,a 1f ! if success, 842fe8fb19SBen Gras mov %o3, %o0 ! set return value 852fe8fb19SBen Gras ERROR() 862fe8fb19SBen Gras1: 872fe8fb19SBen Gras retl ! and update curbrk 882fe8fb19SBen Gras st %o4, [%o2 + %lo(CURBRK)] 892fe8fb19SBen Gras#endif 90