1/* $NetBSD: sbrk.S,v 1.16 2002/03/20 22:06:18 ross Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 39 */ 40 41#include <machine/asm.h> 42#if defined(SYSLIBC_SCCS) && !defined(lint) 43 RCSID("$NetBSD: sbrk.S,v 1.16 2002/03/20 22:06:18 ross Exp $") 44#endif /* SYSLIBC_SCCS and not lint */ 45 46#include "SYS.h" 47 48 .globl _end 49 .globl CURBRK 50 51#ifdef WEAK_ALIAS 52WEAK_ALIAS(sbrk, _sbrk) 53#endif 54 55 .data 56CURBRK: .long _end 57 .text 58 59ENTRY(_sbrk) 60#ifdef PIC 61 movl 4(%esp),%ecx 62 PIC_PROLOGUE 63 movl PIC_GOT(CURBRK),%edx 64 PIC_EPILOGUE 65 movl (%edx),%eax 66 addl %eax,%ecx 67 movl %ecx,4(%esp) 68 SYSTRAP(break) 69 jc err 70 PIC_PROLOGUE 71 movl PIC_GOT(CURBRK),%edx 72 PIC_EPILOGUE 73 movl (%edx),%eax 74 movl %ecx,(%edx) 75 ret 76err: 77 PIC_PROLOGUE 78 mov PIC_GOT(CERROR),%edx 79 PIC_EPILOGUE 80 jmp *%edx 81#else 82 movl 4(%esp),%ecx 83 movl CURBRK,%eax 84 addl %eax,4(%esp) 85 SYSTRAP(break) 86 jc err 87 movl CURBRK,%eax 88 addl %ecx,CURBRK 89 ret 90err: 91 jmp CERROR 92#endif 93