1/* $OpenBSD: sbrk.S,v 1.8 2005/08/07 11:30:38 espie Exp $ */ 2/*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 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. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "SYS.h" 35 36 .globl _end 37 .globl __curbrk 38 39 .data 40__curbrk: .long _end 41 .text 42 43ENTRY(sbrk) 44#ifdef PIC 45 movl 4(%esp),%ecx 46 PIC_PROLOGUE 47 movl PIC_GOT(__curbrk),%edx 48 PIC_EPILOGUE 49 movl (%edx),%eax 50 addl %eax,4(%esp) 51 movl $(SYS_break),%eax 52 int $0x80 53 jc err 54 PIC_PROLOGUE 55 movl PIC_GOT(__curbrk),%edx 56 PIC_EPILOGUE 57 movl (%edx),%eax 58 addl %ecx,(%edx) 59 ret 60err: 61 PIC_PROLOGUE 62 movl PIC_GOT(CERROR), %ecx 63 PIC_EPILOGUE 64 jmp *%ecx 65 66#else 67 68 movl 4(%esp),%ecx 69 movl __curbrk,%eax 70 addl %eax,4(%esp) 71 movl $(SYS_break),%eax 72 int $0x80 73 jc err 74 movl __curbrk,%eax 75 addl %ecx,__curbrk 76 ret 77err: 78 jmp CERROR 79#endif 80