brk.S revision 1.11
1 /* $NetBSD: brk.S,v 1.11 2000/06/23 15:40:38 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 1.11 2000/06/23 15:40:38 kleink Exp $") 47 #endif 48 #endif /* LIBC_SCCS and not lint */ 49 50 .globl _C_LABEL(end) 51 .globl _C_LABEL(__minbrk) 52 .globl CURBRK 53 54 .data 55 _C_LABEL(__minbrk): 56 .long _C_LABEL(end) 57 58 #ifdef WEAK_ALIAS 59 WEAK_ALIAS(brk, _brk) 60 #endif 61 62 .text 63 64 #ifdef WEAK_ALIAS 65 ENTRY(_brk) 66 #else 67 ENTRY(brk) 68 #endif 69 #ifdef PIC 70 #ifdef __ELF__ 71 lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a1 72 movl %a1@(_C_LABEL(__minbrk)@GOT:w),%a0 73 #else 74 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1 75 lea %pc@(0,a1:l),%a1 76 movl %a1@(_C_LABEL(__minbrk):w),%a0 77 #endif 78 movl %a0@,%d0 79 #else 80 movl _C_LABEL(__minbrk),%d0 81 #endif 82 cmpl %sp@(4),%d0 83 jle ok 84 movl %d0,%sp@(4) 85 ok: 86 movl #SYS_break,%d0 87 trap #0 88 jcs err 89 #ifdef PIC 90 #ifdef __ELF__ 91 movl %a1@(CURBRK@GOT:w),%a0 92 #else 93 movl %a1@(CURBRK:w),%a0 94 #endif 95 movl %sp@(4),%a0@ 96 #else 97 movl %sp@(4),CURBRK 98 #endif 99 clrl %d0 100 rts 101 err: 102 jra PIC_PLT(CERROR) 103
Indexes created Mon Sep 29 13:09:55 GMT 2025