sbrk.S revision 1.7
1 /* $NetBSD: sbrk.S,v 1.7 2003/07/01 14:35:45 marcus 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 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 39 */ 40 41 #include <machine/asm.h> 42 #if defined(SYSLIBC_SCCS) && !defined(lint) 43 RCSID("$NetBSD: sbrk.S,v 1.7 2003/07/01 14:35:45 marcus Exp $") 44 #endif /* SYSLIBC_SCCS and not lint */ 45 46 #include "SYS.h" 47 48 .globl _end 49 .globl curbrk 50 51 #ifdef WEAK_ALIAS 52 WEAK_ALIAS(sbrk,_sbrk) 53 #endif 54 55 .data 56 curbrk: .long _end 57 .text 58 59 ENTRY(_sbrk) 60 mov r4, r2 61 #ifdef PIC 62 mova L_GOT, r0 63 mov.l L_GOT, r3 64 add r0, r3 65 mov.l Lcurbrk, r0 66 mov.l @(r0, r3), r0 67 #else 68 mov.l Lcurbrk, r0 69 #endif 70 mov.l @r0, r0 71 add r0, r4 72 mov.l LSYS_break, r0 73 trapa #0x80 74 bf err 75 #ifdef PIC 76 mov.l Lcurbrk, r0 77 mov.l @(r0, r3), r1 78 #else 79 mov.l Lcurbrk, r1 80 #endif 81 mov.l @r1, r0 82 add r0, r2 83 rts 84 mov.l r2, @r1 85 err: 86 mov.l Lcerror, r1 87 #ifdef PIC 88 braf r1 89 #else 90 jmp @r1 91 #endif 92 nop 93 1: 94 95 .align 2 96 LSYS_break: .long SYS_break 97 #ifdef PIC 98 L_GOT: .long _GLOBAL_OFFSET_TABLE_ 99 Lcurbrk: .long curbrk@GOT 100 Lcerror: .long cerror-1b 101 #else 102 Lcurbrk: .long curbrk 103 Lcerror: .long cerror 104 #endif 105 106 107
Indexes created Fri Sep 26 20:09:58 GMT 2025