1/* $NetBSD: sbrk.S,v 1.8 2002/05/07 01:34:22 eeh Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 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 * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 40 */ 41 42#include <machine/asm.h> 43#if defined(SYSLIBC_SCCS) && !defined(lint) 44#if 0 45 .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 46#else 47 RCSID("$NetBSD: sbrk.S,v 1.8 2002/05/07 01:34:22 eeh Exp $") 48#endif 49#endif /* SYSLIBC_SCCS and not lint */ 50 51#include "SYS.h" 52 53 .globl _C_LABEL(__curbrk) 54 .globl _C_LABEL(_end) 55 56#ifdef WEAK_ALIAS 57WEAK_ALIAS(sbrk, _sbrk) 58#endif 59 60 .data 61 .align 8 62_C_LABEL(__curbrk): 63 .xword _C_LABEL(_end) 64 .text 65 66ENTRY(_sbrk) 67#ifdef PIC 68#ifdef BIGPIC 69 PIC_PROLOGUE(%o5,%o4) 70 set _C_LABEL(__curbrk), %o3 71 ldx [%o5 + %o3], %o2 72 ldx [%o2], %o3 /* %o3 = old break */ 73 add %o3, %o0, %o4 /* %o4 = new break */ 74 mov %o4, %o0 /* copy for syscall */ 75 mov SYS_break, %g1 76 t ST_SYSCALL /* break(new_break) */ 77 bcc,a 1f /* if success, */ 78 mov %o3, %o0 /* set return value */ 79 ERROR() 801: 81 retl /* and update curbrk */ 82 stx %o4, [%o2] 83#else 84 PIC_PROLOGUE(%o5,%o4) 85 ldx [%o5 + _C_LABEL(__curbrk)], %o2 86 ldx [%o2], %o3 /* %o3 = old break */ 87 add %o3, %o0, %o4 /* %o4 = new break */ 88 mov %o4, %o0 /* copy for syscall */ 89 mov SYS_break, %g1 90 t ST_SYSCALL /* break(new_break) */ 91 bcc,a 1f /* if success, */ 92 mov %o3, %o0 /* set return value */ 93 ERROR() 941: 95 retl /* and update curbrk */ 96 stx %o4, [%o2] 97#endif 98#else 99 sethi %hi(_C_LABEL(__curbrk)), %o2 100 ldx [%o2 + %lo(_C_LABEL(__curbrk))], %o3 /* %o3 = old break */ 101 add %o3, %o0, %o4 /* %o4 = new break */ 102 mov %o4, %o0 /* copy for syscall */ 103 mov SYS_break, %g1 104 t ST_SYSCALL /* break(new_break) */ 105 bcc,a 1f /* if success, */ 106 mov %o3, %o0 /* set return value */ 107 ERROR() 1081: 109 retl /* and update curbrk */ 110 stx %o4, [%o2 + %lo(_C_LABEL(__curbrk))] 111#endif 112