1209878Snwhitehorn/*- 2209878Snwhitehorn * Copyright (c) 2002 Peter Grehan. 3209878Snwhitehorn * All rights reserved. 4209878Snwhitehorn * 5209878Snwhitehorn * Redistribution and use in source and binary forms, with or without 6209878Snwhitehorn * modification, are permitted provided that the following conditions 7209878Snwhitehorn * are met: 8209878Snwhitehorn * 1. Redistributions of source code must retain the above copyright 9209878Snwhitehorn * notice, this list of conditions and the following disclaimer. 10209878Snwhitehorn * 2. Redistributions in binary form must reproduce the above copyright 11209878Snwhitehorn * notice, this list of conditions and the following disclaimer in the 12209878Snwhitehorn * documentation and/or other materials provided with the distribution. 13209878Snwhitehorn * 14209878Snwhitehorn * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15209878Snwhitehorn * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16209878Snwhitehorn * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17209878Snwhitehorn * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18209878Snwhitehorn * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19209878Snwhitehorn * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20209878Snwhitehorn * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21209878Snwhitehorn * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22209878Snwhitehorn * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23209878Snwhitehorn * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24209878Snwhitehorn * SUCH DAMAGE. 25209878Snwhitehorn */ 26209878Snwhitehorn/* $NetBSD: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $ */ 27209878Snwhitehorn 28209878Snwhitehorn#include <machine/asm.h> 29209878Snwhitehorn__FBSDID("$FreeBSD$"); 30209878Snwhitehorn 31209878Snwhitehorn#include "SYS.h" 32209878Snwhitehorn 33209878Snwhitehorn .globl HIDENAME(curbrk) 34209878Snwhitehorn .globl HIDENAME(minbrk) 35209878Snwhitehorn .globl CNAME(_end) 36209878Snwhitehorn 37209878Snwhitehorn .data 38215147Sdim .align 3 39209878SnwhitehornHIDENAME(minbrk): 40209878Snwhitehorn .llong CNAME(_end) 41209878Snwhitehorn 42209878Snwhitehorn .text 43209878Snwhitehorn 44209878SnwhitehornENTRY(brk) 45209878Snwhitehorn addis %r6,%r2,HIDENAME(minbrk)@toc@ha 46209878Snwhitehorn ld %r6,HIDENAME(minbrk)@toc@l(%r6) 47209878Snwhitehorn cmpld %r6,%r3 /* if (minbrk <= r3) */ 48209878Snwhitehorn bgt 0f 49209878Snwhitehorn mr %r6,%r3 /* r6 = r3 */ 50209878Snwhitehorn0: 51209878Snwhitehorn mr %r3,%r6 /* new break value */ 52209878Snwhitehorn li %r0,SYS_break 53209878Snwhitehorn sc /* assume, that r5 is kept */ 54209878Snwhitehorn bso 1f 55209878Snwhitehorn 56209878Snwhitehorn /* record new break */ 57209878Snwhitehorn addis %r7,%r2,HIDENAME(curbrk)@toc@ha 58209878Snwhitehorn std %r6,HIDENAME(curbrk)@toc@l(%r7) 59209878Snwhitehorn 60209878Snwhitehorn blr /* return 0 */ 61209878Snwhitehorn 62209878Snwhitehorn1: 63209878Snwhitehorn mflr %r0 64209878Snwhitehorn std %r0,16(%r1) 65209878Snwhitehorn stdu %r1,-48(%r1) 66218824Snwhitehorn bl HIDENAME(cerror) 67209878Snwhitehorn nop 68209878Snwhitehorn ld %r1,0(%r1) 69209878Snwhitehorn ld %r0,16(%r1) 70209878Snwhitehorn mtlr %r0 71209878Snwhitehorn blr 72217398Skib 73217398Skib .section .note.GNU-stack,"",%progbits 74