sbrk.S revision 1.13
1 /* $NetBSD: sbrk.S,v 1.13 2001/05/05 17:46:37 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: @(#)sbrk.s 5.1 (Berkeley) 5/12/90") 45 #else 46 RCSID("$NetBSD: sbrk.S,v 1.13 2001/05/05 17:46:37 kleink Exp $") 47 #endif 48 #endif /* LIBC_SCCS and not lint */ 49 50 .globl _end 51 .globl CURBRK 52 53 #ifdef WEAK_ALIAS 54 WEAK_ALIAS(sbrk, _sbrk) 55 #endif 56 57 .data 58 CURBRK: .long _end 59 60 .text 61 62 ENTRY(_sbrk) 63 #ifdef PIC 64 #ifdef __ELF__ 65 lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a1 66 movl %a1@(CURBRK@GOT:w),%a1 67 #else 68 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1 69 lea %pc@(0,%a1:l),%a1 70 movl %a1@(CURBRK:w),%a1 71 #endif 72 movl %a1@,%d0 73 #else 74 movl CURBRK,%d0 75 #endif 76 addl %d0,%sp@(4) 77 movl #SYS_break,%d0 78 trap #0 79 jcs err 80 #ifdef PIC 81 movl %a1@,%d0 82 movl %sp@(4),%a1@ 83 #else 84 movl CURBRK,%d0 85 movl %sp@(4),CURBRK 86 #endif 87 #ifdef __SVR4_ABI__ 88 movl %d0,%a0 89 #endif 90 rts 91 err: 92 jra PIC_PLT(CERROR) 93
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