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: sbrk.S,v 1.8 2000/06/26 06:25:44 kleink Exp $ */ 27209878Snwhitehorn 28209878Snwhitehorn#include <machine/asm.h> 29209878Snwhitehorn__FBSDID("$FreeBSD$"); 30209878Snwhitehorn 31209878Snwhitehorn#include "SYS.h" 32209878Snwhitehorn 33209878Snwhitehorn .globl HIDENAME(curbrk) 34209878Snwhitehorn .globl CNAME(_end) 35209878Snwhitehorn 36209878Snwhitehorn .data 37215147Sdim .align 3 38209878SnwhitehornHIDENAME(curbrk): 39209878Snwhitehorn .llong CNAME(_end) 40209878Snwhitehorn 41209878Snwhitehorn .text 42209878SnwhitehornENTRY(sbrk) 43209878Snwhitehorn addis %r5,%r2,HIDENAME(curbrk)@toc@ha 44209878Snwhitehorn addi %r5,%r5,HIDENAME(curbrk)@toc@l 45209878Snwhitehorn ld %r6,0(%r5) /* r6 = old break */ 46209878Snwhitehorn cmpdi %r3,0 /* sbrk(0) - return curbrk */ 47209878Snwhitehorn beq 1f 48209878Snwhitehorn add %r3,%r3,%r6 49209878Snwhitehorn mr %r7,%r3 /* r7 = new break */ 50209878Snwhitehorn li %r0,SYS_break 51209878Snwhitehorn sc /* break(new_break) */ 52209878Snwhitehorn bso 2f 53209878Snwhitehorn std %r7,0(%r5) 54209878Snwhitehorn1: 55209878Snwhitehorn mr %r3,%r6 /* set return value */ 56209878Snwhitehorn blr 57209878Snwhitehorn2: 58209878Snwhitehorn mflr %r0 59209878Snwhitehorn std %r0,16(%r1) 60209878Snwhitehorn stdu %r1,-48(%r1) 61218824Snwhitehorn bl HIDENAME(cerror) 62209878Snwhitehorn nop 63209878Snwhitehorn ld %r1,0(%r1) 64209878Snwhitehorn ld %r0,16(%r1) 65209878Snwhitehorn mtlr %r0 66209878Snwhitehorn blr 67217398Skib 68217398Skib .section .note.GNU-stack,"",%progbits 69