1107571Sgrehan/*- 2107571Sgrehan * Copyright (c) 2002 Peter Grehan. 3107571Sgrehan * All rights reserved. 4107571Sgrehan * 5107571Sgrehan * Redistribution and use in source and binary forms, with or without 6107571Sgrehan * modification, are permitted provided that the following conditions 7107571Sgrehan * are met: 8107571Sgrehan * 1. Redistributions of source code must retain the above copyright 9107571Sgrehan * notice, this list of conditions and the following disclaimer. 10107571Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 11107571Sgrehan * notice, this list of conditions and the following disclaimer in the 12107571Sgrehan * documentation and/or other materials provided with the distribution. 13107571Sgrehan * 14107571Sgrehan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15107571Sgrehan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16107571Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17107571Sgrehan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18107571Sgrehan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19107571Sgrehan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20107571Sgrehan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21107571Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22107571Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23107571Sgrehan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24107571Sgrehan * SUCH DAMAGE. 25107571Sgrehan */ 26107571Sgrehan/* $NetBSD: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $ */ 27107571Sgrehan 28107571Sgrehan#include <machine/asm.h> 29107571Sgrehan__FBSDID("$FreeBSD$"); 30107571Sgrehan 31107571Sgrehan#include "SYS.h" 32107571Sgrehan 33107571Sgrehan .globl HIDENAME(curbrk) 34107571Sgrehan .globl HIDENAME(minbrk) 35107571Sgrehan .globl CNAME(_end) 36107571Sgrehan 37107571Sgrehan .data 38107571SgrehanHIDENAME(minbrk): 39107571Sgrehan .long CNAME(_end) 40107571Sgrehan 41107571Sgrehan .text 42107571Sgrehan 43107571SgrehanENTRY(brk) 44107571Sgrehan#ifdef PIC 45107571Sgrehan mflr %r10 46107571Sgrehan bl _GLOBAL_OFFSET_TABLE_@local-4 47107571Sgrehan mflr %r9 48107571Sgrehan mtlr %r10 49107571Sgrehan lwz %r5,HIDENAME(minbrk)@got(%r9) 50107571Sgrehan lwz %r6,0(%r5) 51107571Sgrehan#else 52107571Sgrehan lis %r5,HIDENAME(minbrk)@ha 53107571Sgrehan lwz %r6,HIDENAME(minbrk)@l(%r5) 54107571Sgrehan#endif 55107571Sgrehan cmplw %r6,%r3 /* if (minbrk <= r3) */ 56107571Sgrehan bgt 0f 57107571Sgrehan mr %r6,%r3 /* r6 = r3 */ 58107571Sgrehan0: 59107571Sgrehan mr %r3,%r6 /* new break value */ 60107571Sgrehan li %r0,SYS_break 61107571Sgrehan sc /* assume, that r5 is kept */ 62107571Sgrehan bso 1f 63107571Sgrehan#ifdef PIC 64107571Sgrehan lwz %r7,HIDENAME(curbrk)@got(%r9) 65107571Sgrehan stw %r6,0(%r7) 66107571Sgrehan#else 67107571Sgrehan lis %r7,HIDENAME(curbrk)@ha /* record new break */ 68107571Sgrehan stw %r6,HIDENAME(curbrk)@l(%r7) 69107571Sgrehan#endif 70107571Sgrehan blr /* return 0 */ 71107571Sgrehan 72107571Sgrehan1: 73107571Sgrehan b PIC_PLT(HIDENAME(cerror)) 74217398Skib 75217398Skib .section .note.GNU-stack,"",%progbits 76