1/* $NetBSD: brk.S,v 1.13 2001/05/05 17:46:37 kleink 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 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40#include "SYS.h" 41 42#if defined(LIBC_SCCS) && !defined(lint) 43#if 0 44 RCSID("from: @(#)brk.s 5.1 (Berkeley) 5/12/90") 45#else 46 RCSID("$NetBSD: brk.S,v 1.13 2001/05/05 17:46:37 kleink Exp $") 47#endif 48#endif /* LIBC_SCCS and not lint */ 49 50 .globl _end 51 .globl _C_LABEL(__minbrk) 52 .globl CURBRK 53 54#ifdef WEAK_ALIAS 55WEAK_ALIAS(brk, _brk) 56#endif 57 58 .data 59_C_LABEL(__minbrk): 60 .long _end 61 62 .text 63 64ENTRY(_brk) 65#ifdef PIC 66#ifdef __ELF__ 67 lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a1 68 movl %a1@(_C_LABEL(__minbrk)@GOT:w),%a0 69#else 70 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1 71 lea %pc@(0,a1:l),%a1 72 movl %a1@(_C_LABEL(__minbrk):w),%a0 73#endif 74 movl %a0@,%d0 75#else 76 movl _C_LABEL(__minbrk),%d0 77#endif 78 cmpl %sp@(4),%d0 79 jle ok 80 movl %d0,%sp@(4) 81ok: 82 movl #SYS_break,%d0 83 trap #0 84 jcs err 85#ifdef PIC 86#ifdef __ELF__ 87 movl %a1@(CURBRK@GOT:w),%a0 88#else 89 movl %a1@(CURBRK:w),%a0 90#endif 91 movl %sp@(4),%a0@ 92#else 93 movl %sp@(4),CURBRK 94#endif 95 clrl %d0 96 rts 97err: 98 jra PIC_PLT(CERROR) 99