sbrk.S revision 209878
1/*- 2 * Copyright (c) 2002 Peter Grehan. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26/* $NetBSD: sbrk.S,v 1.8 2000/06/26 06:25:44 kleink Exp $ */ 27 28#include <machine/asm.h> 29__FBSDID("$FreeBSD: head/lib/libc/powerpc64/sys/sbrk.S 209878 2010-07-10 14:45:03Z nwhitehorn $"); 30 31#include "SYS.h" 32 33 .globl HIDENAME(curbrk) 34 .globl CNAME(_end) 35 36 .data 37HIDENAME(curbrk): 38 .llong CNAME(_end) 39 40 .text 41ENTRY(sbrk) 42 addis %r5,%r2,HIDENAME(curbrk)@toc@ha 43 addi %r5,%r5,HIDENAME(curbrk)@toc@l 44 ld %r6,0(%r5) /* r6 = old break */ 45 cmpdi %r3,0 /* sbrk(0) - return curbrk */ 46 beq 1f 47 add %r3,%r3,%r6 48 mr %r7,%r3 /* r7 = new break */ 49 li %r0,SYS_break 50 sc /* break(new_break) */ 51 bso 2f 52 std %r7,0(%r5) 531: 54 mr %r3,%r6 /* set return value */ 55 blr 562: 57 mflr %r0 58 std %r0,16(%r1) 59 stdu %r1,-48(%r1) 60 bl PIC_PLT(HIDENAME(cerror)) 61 nop 62 ld %r1,0(%r1) 63 ld %r0,16(%r1) 64 mtlr %r0 65 blr 66