1/* $NetBSD: brk.S,v 1.19 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: @(#)brk.s 5.2 (Berkeley) 12/17/90 39 */ 40 41#include <machine/asm.h> 42#if defined(SYSLIBC_SCCS) && !defined(lint) 43 RCSID("$NetBSD: brk.S,v 1.19 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 _C_LABEL(__minbrk) 50 .globl CURBRK 51 52#ifdef WEAK_ALIAS 53WEAK_ALIAS(brk, _brk) 54#endif 55 56 .data 57_C_LABEL(__minbrk): 58 .long _end 59 .text 60 61ENTRY(_brk) 62#ifdef PIC 63 movl 4(%esp),%ecx 64 PIC_PROLOGUE 65 movl PIC_GOT(_C_LABEL(__minbrk)),%edx 66 PIC_EPILOGUE 67 cmpl %ecx,(%edx) 68 jb 1f 69 movl (%edx),%ecx 70 movl %ecx,4(%esp) 711: 72 SYSTRAP(break) 73 jc err 74 PIC_PROLOGUE 75 movl PIC_GOT(CURBRK),%edx # set up GOT addressing 76 PIC_EPILOGUE 77 movl %ecx,(%edx) 78 xorl %eax,%eax 79 ret 80err: 81 PIC_PROLOGUE 82 mov PIC_GOT(CERROR),%edx 83 PIC_EPILOGUE 84 jmp *%edx 85#else 86 movl 4(%esp),%ecx 87 cmpl %ecx,_C_LABEL(__minbrk) 88 jb 1f 89 movl _C_LABEL(__minbrk),%ecx 90 movl %ecx,4(%esp) 911: 92 SYSTRAP(break) 93 jc err 94 movl %ecx,CURBRK 95 xorl %eax,%eax 96 ret 97err: 98 jmp CERROR 99#endif 100