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: @(#)brk.s 5.2 (Berkeley) 12/17/90 37 * $Id: brk.S,v 1.9 1994/10/26 19:49:45 mycroft Exp $ 38 */ 39 40#if defined(SYSLIBC_SCCS) && !defined(lint) 41 .text 42 .asciz "$Id: brk.S,v 1.9 1994/10/26 19:49:45 mycroft Exp $" 43#endif /* SYSLIBC_SCCS and not lint */ 44 45#include "SYS.h" 46 47 .globl _end 48 .globl minbrk 49 .globl curbrk 50 51 .data 52minbrk: .long _end 53 .text 54 55ENTRY(brk) 56#ifdef PIC 57 movl 4(%esp),%ecx 58 PIC_PROLOGUE 59 movl PIC_GOT(minbrk),%edx 60 PIC_EPILOGUE 61 cmpl %ecx,(%edx) 62 jl 1f 63 movl (%edx),%ecx 64 movl %ecx,4(%esp) 651: 66 movl $(SYS_break),%eax 67 int $0x80 68 jc err 69 PIC_PROLOGUE 70 movl PIC_GOT(curbrk),%edx # set up GOT addressing 71 PIC_EPILOGUE 72 xorl %eax,%eax 73 movl %ecx,(%edx) 74 ret 75err: 76 jmp PIC_PLT(cerror) 77 78#else 79 80 movl 4(%esp),%ecx 81 cmpl %ecx,minbrk 82 jl 1f 83 movl minbrk,%ecx 84 movl %ecx,4(%esp) 851: 86 movl $(SYS_break),%eax 87 int $0x80 88 jc err 89 xorl %eax,%eax 90 movl %ecx,curbrk 91 ret 92err: 93 jmp cerror 94#endif 95