brk.S revision 218824
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: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $ */ 27 28#include <machine/asm.h> 29__FBSDID("$FreeBSD: head/lib/libc/powerpc64/sys/brk.S 218824 2011-02-18 21:44:53Z nwhitehorn $"); 30 31#include "SYS.h" 32 33 .globl HIDENAME(curbrk) 34 .globl HIDENAME(minbrk) 35 .globl CNAME(_end) 36 37 .data 38 .align 3 39HIDENAME(minbrk): 40 .llong CNAME(_end) 41 42 .text 43 44ENTRY(brk) 45 addis %r6,%r2,HIDENAME(minbrk)@toc@ha 46 ld %r6,HIDENAME(minbrk)@toc@l(%r6) 47 cmpld %r6,%r3 /* if (minbrk <= r3) */ 48 bgt 0f 49 mr %r6,%r3 /* r6 = r3 */ 500: 51 mr %r3,%r6 /* new break value */ 52 li %r0,SYS_break 53 sc /* assume, that r5 is kept */ 54 bso 1f 55 56 /* record new break */ 57 addis %r7,%r2,HIDENAME(curbrk)@toc@ha 58 std %r6,HIDENAME(curbrk)@toc@l(%r7) 59 60 blr /* return 0 */ 61 621: 63 mflr %r0 64 std %r0,16(%r1) 65 stdu %r1,-48(%r1) 66 bl HIDENAME(cerror) 67 nop 68 ld %r1,0(%r1) 69 ld %r0,16(%r1) 70 mtlr %r0 71 blr 72 73 .section .note.GNU-stack,"",%progbits 74