1/* $NetBSD: brk.S,v 1.18 2013/07/24 15:38:07 matt 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include "SYS.h" 37 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)brk.s 5.1 (Berkeley) 5/12/90") 41#else 42 RCSID("$NetBSD: brk.S,v 1.18 2013/07/24 15:38:07 matt Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46 .globl _end 47 .globl _C_LABEL(__minbrk) 48 .hidden _C_LABEL(__minbrk) 49 .globl _C_LABEL(__curbrk) 50 .hidden _C_LABEL(__curbrk) 51 52#ifdef WEAK_ALIAS 53WEAK_ALIAS(brk, _brk) 54#endif 55 56 .data 57_C_LABEL(__minbrk): 58 .long _end 59 60 .text 61 62ENTRY(_brk) 63#ifdef __PIC__ 64 LEA_LCL(_C_LABEL(__minbrk),%a1) 65 movl (%a1),%a1 66#else 67 movl _C_LABEL(__minbrk),%a1 68#endif 69 cmpl 4(%sp),%a1 70 jls ok 71 movl %a1,4(%sp) 72ok: 73 SYSTRAP(break) 74 jcs CERROR 75#ifdef __PIC__ 76 LEA_LCL(_C_LABEL(__curbrk),%a0) 77 movl %a1,(%a0) 78#else 79 movl %a1,_C_LABEL(__curbrk) 80#endif 81 clrl %d0 82 rts 83END(_brk) 84