1/* $NetBSD: brk.S,v 1.7 2001/05/11 19:58:08 msaitoh 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 1.7 2001/05/11 19:58:08 msaitoh Exp $") 44#endif /* SYSLIBC_SCCS and not lint */ 45 46#include "SYS.h" 47 48#ifdef WEAK_ALIAS 49WEAK_ALIAS(brk,_brk) 50#endif 51 52 .data 53 .globl _C_LABEL(__minbrk) 54 .align 2 55_C_LABEL(__minbrk): 56 .long _end 57 58 .text 59 60ENTRY(_brk) 61 mov.l Lminbrk, r0 62 mov.l @r0, r0 63 cmp/hs r4, r0 64 bf 1f 65 mov r0, r4 661: 67 mov.l LSYS_break, r0 68 trapa #0x80 69 bf err 70 xor r0, r0 71 mov.l Lcurbrk, r1 72 rts 73 mov.l r4, @r1 74err: 75 mov.l Lcerror, r1 76 jmp @r1 77 nop 78 79 80 .align 2 81Lminbrk: .long _C_LABEL(__minbrk) 82LSYS_break: .long SYS_break 83Lcurbrk: .long curbrk 84Lcerror: .long cerror 85