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: releng/11.0/lib/libc/powerpc/sys/brk.S 272362 2014-10-01 15:00:21Z bapt $"); 30 31#include "SYS.h" 32 33 .globl HIDENAME(curbrk) 34 .globl HIDENAME(minbrk) 35 .globl CNAME(_end) 36 37 .data 38HIDENAME(minbrk): 39 .long CNAME(_end) 40 41 .text 42 43ENTRY(brk) 44#ifdef PIC 45 mflr %r10 46 bl _GLOBAL_OFFSET_TABLE_@local-4 47 mflr %r9 48 mtlr %r10 49 lwz %r5,HIDENAME(minbrk)@got(%r9) 50 lwz %r6,0(%r5) 51#else 52 lis %r5,HIDENAME(minbrk)@ha 53 lwz %r6,HIDENAME(minbrk)@l(%r5) 54#endif 55 cmplw %r6,%r3 /* if (minbrk <= r3) */ 56 bgt 0f 57 mr %r6,%r3 /* r6 = r3 */ 580: 59 mr %r3,%r6 /* new break value */ 60 li %r0,SYS_break 61 sc /* assume, that r5 is kept */ 62 bso 1f 63#ifdef PIC 64 lwz %r7,HIDENAME(curbrk)@got(%r9) 65 stw %r6,0(%r7) 66#else 67 lis %r7,HIDENAME(curbrk)@ha /* record new break */ 68 stw %r6,HIDENAME(curbrk)@l(%r7) 69#endif 70 blr /* return 0 */ 71 721: 73 b PIC_PLT(HIDENAME(cerror)) 74END(brk) 75 76 .section .note.GNU-stack,"",%progbits 77