brk.S revision 1.10
1 /* $NetBSD: brk.S,v 1.10 2006/01/06 03:58:31 uwe 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 35 */ 36 37 #include <machine/asm.h> 38 #if defined(SYSLIBC_SCCS) && !defined(lint) 39 RCSID("$NetBSD: brk.S,v 1.10 2006/01/06 03:58:31 uwe Exp $") 40 #endif /* SYSLIBC_SCCS and not lint */ 41 42 #include "SYS.h" 43 44 #ifdef WEAK_ALIAS 45 WEAK_ALIAS(brk,_brk) 46 #endif 47 48 .data 49 .globl _C_LABEL(__minbrk) 50 .align 2 51 _C_LABEL(__minbrk): 52 .long _end 53 54 .text 55 56 ENTRY(_brk) 57 #ifdef PIC 58 mova L_GOT, r0 59 mov.l L_GOT, r2 60 add r0, r2 61 mov.l Lminbrk, r0 62 mov.l @(r0, r2), r0 63 mov.l @r0, r0 64 #else 65 mov.l Lminbrk, r0 66 mov.l @r0, r0 67 #endif 68 cmp/hs r4, r0 69 bf 1f 70 mov r0, r4 71 1: 72 mov.l LSYS_break, r0 73 trapa #0x80 74 bf err 75 #ifdef PIC 76 mov.l Lcurbrk, r0 77 mov.l @(r0, r2), r1 78 xor r0, r0 79 #else 80 xor r0, r0 81 mov.l Lcurbrk, r1 82 #endif 83 rts 84 mov.l r4, @r1 85 err: 86 JUMP_CERROR 87 88 .align 2 89 LSYS_break: .long SYS_break 90 #ifdef PIC 91 L_GOT: .long _GLOBAL_OFFSET_TABLE_ 92 Lminbrk: .long _C_LABEL(__minbrk)@GOT 93 Lcurbrk: .long curbrk@GOT 94 #else 95 Lminbrk: .long _C_LABEL(__minbrk) 96 Lcurbrk: .long curbrk 97 #endif 98 SET_ENTRY_SIZE(_brk) 99
Indexes created Mon Sep 29 21:09:56 GMT 2025