brk.S revision 1.14
1 /* $NetBSD: brk.S,v 1.14 2003/08/07 16:42:14 agc 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 1.14 2003/08/07 16:42:14 agc Exp $") 43 #endif 44 #endif /* LIBC_SCCS and not lint */ 45 46 .globl _end 47 .globl _C_LABEL(__minbrk) 48 .globl CURBRK 49 50 #ifdef WEAK_ALIAS 51 WEAK_ALIAS(brk, _brk) 52 #endif 53 54 .data 55 _C_LABEL(__minbrk): 56 .long _end 57 58 .text 59 60 ENTRY(_brk) 61 #ifdef PIC 62 #ifdef __ELF__ 63 lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a1 64 movl %a1@(_C_LABEL(__minbrk)@GOT:w),%a0 65 #else 66 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1 67 lea %pc@(0,a1:l),%a1 68 movl %a1@(_C_LABEL(__minbrk):w),%a0 69 #endif 70 movl %a0@,%d0 71 #else 72 movl _C_LABEL(__minbrk),%d0 73 #endif 74 cmpl %sp@(4),%d0 75 jle ok 76 movl %d0,%sp@(4) 77 ok: 78 movl #SYS_break,%d0 79 trap #0 80 jcs err 81 #ifdef PIC 82 #ifdef __ELF__ 83 movl %a1@(CURBRK@GOT:w),%a0 84 #else 85 movl %a1@(CURBRK:w),%a0 86 #endif 87 movl %sp@(4),%a0@ 88 #else 89 movl %sp@(4),CURBRK 90 #endif 91 clrl %d0 92 rts 93 err: 94 jra PIC_PLT(CERROR) 95
Indexes created Sun Sep 28 07:09:56 GMT 2025