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: releng/11.0/lib/libc/powerpc/sys/sbrk.S 272362 2014-10-01 15:00:21Z bapt $"); 30 31#include "SYS.h" 32 33 .globl HIDENAME(curbrk) 34 .globl CNAME(_end) 35 36 .data 37HIDENAME(curbrk): 38 .long CNAME(_end) 39 40 .text 41ENTRY(sbrk) 42 43#ifdef PIC 44 mflr %r10 45 bl _GLOBAL_OFFSET_TABLE_@local-4 46 mflr %r5 47 mtlr %r10 48 lwz %r5,HIDENAME(curbrk)@got(%r5) 49 lwz %r6,0(%r5) 50#else 51 lis %r5,HIDENAME(curbrk)@ha 52 lwz %r6,HIDENAME(curbrk)@l(%r5) /* r6 = old break */ 53#endif 54 cmpwi %r3,0 /* sbrk(0) - return curbrk */ 55 beq 1f 56 add %r3,%r3,%r6 57 mr %r7,%r3 /* r7 = new break */ 58 li %r0,SYS_break 59 sc /* break(new_break) */ 60 bso 2f 61#ifdef PIC 62 stw %r7,0(%r5) 63#else 64 stw %r7,HIDENAME(curbrk)@l(%r5) /* record new break */ 65#endif 661: 67 mr %r3,%r6 /* set return value */ 68 blr 692: 70 b PIC_PLT(HIDENAME(cerror)) 71END(sbrk) 72 73 .section .note.GNU-stack,"",%progbits 74