sbrk.S revision 1.10
1 1.10 uwe /* $NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $ */ 2 1.3 christos 3 1.1 cgd /* 4 1.1 cgd * Copyright (c) 1992, 1993 5 1.1 cgd * The Regents of the University of California. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This software was developed by the Computer Systems Engineering group 8 1.1 cgd * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 cgd * contributed to Berkeley. 10 1.1 cgd * 11 1.1 cgd * Redistribution and use in source and binary forms, with or without 12 1.1 cgd * modification, are permitted provided that the following conditions 13 1.1 cgd * are met: 14 1.1 cgd * 1. Redistributions of source code must retain the above copyright 15 1.1 cgd * notice, this list of conditions and the following disclaimer. 16 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 cgd * notice, this list of conditions and the following disclaimer in the 18 1.1 cgd * documentation and/or other materials provided with the distribution. 19 1.9 agc * 3. Neither the name of the University nor the names of its contributors 20 1.1 cgd * may be used to endorse or promote products derived from this software 21 1.1 cgd * without specific prior written permission. 22 1.1 cgd * 23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 cgd * SUCH DAMAGE. 34 1.1 cgd * 35 1.1 cgd * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp 36 1.1 cgd */ 37 1.1 cgd 38 1.3 christos #include <machine/asm.h> 39 1.3 christos #if defined(SYSLIBC_SCCS) && !defined(lint) 40 1.3 christos #if 0 41 1.1 cgd .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93" 42 1.3 christos #else 43 1.10 uwe RCSID("$NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $") 44 1.3 christos #endif 45 1.3 christos #endif /* SYSLIBC_SCCS and not lint */ 46 1.1 cgd 47 1.1 cgd #include "SYS.h" 48 1.1 cgd 49 1.6 kleink .globl _end 50 1.5 kleink .globl CURBRK 51 1.1 cgd 52 1.7 kleink #ifdef WEAK_ALIAS 53 1.7 kleink WEAK_ALIAS(sbrk, _sbrk) 54 1.7 kleink #endif 55 1.7 kleink 56 1.1 cgd .data 57 1.6 kleink CURBRK: .long _end 58 1.1 cgd .text 59 1.1 cgd 60 1.7 kleink ENTRY(_sbrk) 61 1.2 pk #ifdef PIC 62 1.2 pk PIC_PROLOGUE(%o5,%o4) 63 1.10 uwe set CURBRK, %o2 64 1.10 uwe ld [%o5 + %o2], %o2 65 1.2 pk ld [%o2], %o3 ! %o3 = old break 66 1.2 pk add %o3, %o0, %o4 ! %o4 = new break 67 1.2 pk mov %o4, %o0 ! copy for syscall 68 1.2 pk mov SYS_break, %g1 69 1.2 pk t ST_SYSCALL ! break(new_break) 70 1.2 pk bcc,a 1f ! if success, 71 1.2 pk mov %o3, %o0 ! set return value 72 1.2 pk ERROR() 73 1.2 pk 1: 74 1.2 pk retl ! and update curbrk 75 1.2 pk st %o4, [%o2] 76 1.2 pk #else 77 1.5 kleink sethi %hi(CURBRK), %o2 78 1.5 kleink ld [%o2 + %lo(CURBRK)], %o3 ! %o3 = old break 79 1.1 cgd add %o3, %o0, %o4 ! %o4 = new break 80 1.1 cgd mov %o4, %o0 ! copy for syscall 81 1.1 cgd mov SYS_break, %g1 82 1.1 cgd t ST_SYSCALL ! break(new_break) 83 1.1 cgd bcc,a 1f ! if success, 84 1.1 cgd mov %o3, %o0 ! set return value 85 1.1 cgd ERROR() 86 1.1 cgd 1: 87 1.1 cgd retl ! and update curbrk 88 1.5 kleink st %o4, [%o2 + %lo(CURBRK)] 89 1.2 pk #endif 90
Indexes created Tue Sep 30 20:09:53 GMT 2025