1/* $OpenBSD: sbrk.S,v 1.13 2023/01/11 01:55:17 mortimer Exp $ */ 2/* $NetBSD: sbrk.S,v 1.1 2001/06/19 00:25:06 fvdl Exp $ */ 3 4/*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90 40 */ 41 42#include <machine/asm.h> 43 44#include "SYS.h" 45 46 .globl _end 47 .globl __curbrk 48 .hidden __curbrk 49 50 .data 51__curbrk: 52 .quad _end 53 END(__curbrk) 54 .type __curbrk,@object 55 56ENTRY_NB(sbrk) 57 RETGUARD_SETUP(sbrk, r11); 58 RETGUARD_PUSH(r11); 59 movq __curbrk(%rip),%rax 60 movslq %edi,%rsi 61 movq %rsi,%rdi 62 addq %rax,%rdi 63 SYSTRAP(break) 64 jc 1f 65 movq __curbrk(%rip),%rax 66 addq %rsi,__curbrk(%rip) 67 jmp 2f 681: 69 SET_ERRNO 702: 71 RETGUARD_POP(r11); 72 RETGUARD_CHECK(sbrk, r11); 73 ret 74END(sbrk) 75 .weak sbrk 76