1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 37 * $Id: sbrk.S,v 1.7 1994/10/26 19:49:49 mycroft Exp $ 38 */ 39 40#if defined(SYSLIBC_SCCS) && !defined(lint) 41 .text 42 .asciz "$Id: sbrk.S,v 1.7 1994/10/26 19:49:49 mycroft Exp $" 43#endif /* SYSLIBC_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 movl 4(%esp),%ecx 57 PIC_PROLOGUE 58 movl PIC_GOT(curbrk),%edx 59 PIC_EPILOGUE 60 movl (%edx),%eax 61 addl %eax,4(%esp) 62 movl $(SYS_break),%eax 63 int $0x80 64 jc err 65 PIC_PROLOGUE 66 movl PIC_GOT(curbrk),%edx 67 PIC_EPILOGUE 68 movl (%edx),%eax 69 addl %ecx,(%edx) 70 ret 71err: 72 jmp PIC_PLT(cerror) 73 74#else 75 76 movl 4(%esp),%ecx 77 movl curbrk,%eax 78 addl %eax,4(%esp) 79 movl $(SYS_break),%eax 80 int $0x80 81 jc err 82 movl curbrk,%eax 83 addl %ecx,curbrk 84 ret 85err: 86 jmp cerror 87#endif 88