brk.S revision 1.5
1 /* $NetBSD: brk.S,v 1.5 1995/12/13 22:17:52 thorpej 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 1.5 1995/12/13 22:17:52 thorpej Exp $") 47 #endif 48 #endif /* LIBC_SCCS and not lint */ 49 50 .globl _end 51 .globl minbrk 52 .globl curbrk 53 54 .data 55 minbrk: .long _end 56 .text 57 58 ENTRY(brk) 59 #ifdef PIC 60 movl #__GLOBAL_OFFSET_TABLE_,a1 61 lea pc@(0,a1:l),a1 62 movl a1@(minbrk:w),a0 63 movl a0@,d0 64 #else 65 movl minbrk,d0 66 #endif 67 cmpl sp@(4),d0 68 jle ok 69 movl d0,sp@(4) 70 ok: 71 movl #SYS_break,d0 72 trap #0 73 jcs err 74 #ifdef PIC 75 movl a1@(curbrk:w),a0 76 movl sp@(4),a0@ 77 #else 78 movl sp@(4),curbrk 79 #endif 80 clrl d0 81 rts 82 err: 83 jra cerror 84
Indexes created Sun Sep 28 12:09:53 GMT 2025