1/* $NetBSD: sbrk.S,v 1.6 2014/05/22 15:01:57 uebayasi Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 35 */ 36 37#include <machine/asm.h> 38#if defined(SYSLIBC_SCCS) && !defined(lint) 39 RCSID("$NetBSD: sbrk.S,v 1.6 2014/05/22 15:01:57 uebayasi Exp $") 40#endif /* SYSLIBC_SCCS and not lint */ 41 42#include "SYS.h" 43 44 .globl _end 45 .globl CURBRK 46 47#ifdef WEAK_ALIAS 48WEAK_ALIAS(sbrk, _sbrk) 49#endif 50 51 .data 52CURBRK: .quad _end 53 .text 54 55ENTRY(_sbrk) 56#ifdef __PIC__ 57 movq PIC_GOT(CURBRK),%rdx 58 movq (%rdx),%rax 59 test %rdi,%rdi 60 jz out 61 addq %rax,%rdi 62 SYSTRAP(break) 63 jc err 64 movq PIC_GOT(CURBRK),%rdx 65 movq (%rdx),%rax 66 movq %rdi,(%rdx) 67out: 68 ret 69err: 70 jmp CERROR 71#else 72 movq CURBRK(%rip),%rax 73 test %rdi,%rdi 74 jz out 75 movq %rdi,%rsi 76 addq %rax,%rdi 77 SYSTRAP(break) 78 jc err 79 movq CURBRK(%rip),%rax 80 addq %rsi,CURBRK(%rip) 81out: 82 ret 83err: 84 jmp CERROR 85#endif 86END(_sbrk) 87