1*39b8558cSmortimer/* $OpenBSD: brk.S,v 1.13 2023/01/11 01:55:17 mortimer Exp $ */ 2118f6189Smickey/* $NetBSD: brk.S,v 1.2 2002/06/03 18:30:33 fvdl Exp $ */ 3118f6189Smickey 4118f6189Smickey/*- 5118f6189Smickey * Copyright (c) 1990 The Regents of the University of California. 6118f6189Smickey * All rights reserved. 7118f6189Smickey * 8118f6189Smickey * This code is derived from software contributed to Berkeley by 9118f6189Smickey * William Jolitz. 10118f6189Smickey * 11118f6189Smickey * Redistribution and use in source and binary forms, with or without 12118f6189Smickey * modification, are permitted provided that the following conditions 13118f6189Smickey * are met: 14118f6189Smickey * 1. Redistributions of source code must retain the above copyright 15118f6189Smickey * notice, this list of conditions and the following disclaimer. 16118f6189Smickey * 2. Redistributions in binary form must reproduce the above copyright 17118f6189Smickey * notice, this list of conditions and the following disclaimer in the 18118f6189Smickey * documentation and/or other materials provided with the distribution. 1924fdaee6Sjsg * 3. Neither the name of the University nor the names of its contributors 20118f6189Smickey * may be used to endorse or promote products derived from this software 21118f6189Smickey * without specific prior written permission. 22118f6189Smickey * 23118f6189Smickey * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24118f6189Smickey * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25118f6189Smickey * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26118f6189Smickey * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27118f6189Smickey * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28118f6189Smickey * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29118f6189Smickey * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30118f6189Smickey * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31118f6189Smickey * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32118f6189Smickey * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33118f6189Smickey * SUCH DAMAGE. 34118f6189Smickey * 35118f6189Smickey * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 36118f6189Smickey */ 37118f6189Smickey 38118f6189Smickey#include <machine/asm.h> 39118f6189Smickey 40118f6189Smickey#include "SYS.h" 41118f6189Smickey 42118f6189Smickey .globl _end 430b4d25b1Sdrahn .globl __curbrk 44118f6189Smickey 45118f6189Smickey .data 46b3b7ef2eSguenther__minbrk: 47118f6189Smickey .quad _end 48aa797096Sguenther END(__minbrk) 49aa797096Sguenther .type __minbrk,@object 50118f6189Smickey 51ec0f1ad6SguentherENTRY_NB(brk) 52*39b8558cSmortimer RETGUARD_SETUP(brk, r11); 53*39b8558cSmortimer RETGUARD_PUSH(r11); 54b3b7ef2eSguenther cmpq %rdi,__minbrk(%rip) 55118f6189Smickey jb 1f 56b3b7ef2eSguenther movq __minbrk(%rip),%rdi 57118f6189Smickey1: 58118f6189Smickey SYSTRAP(break) 59aa797096Sguenther jc 1f 600b4d25b1Sdrahn movq %rdi,__curbrk(%rip) 61118f6189Smickey xorl %eax,%eax 62*39b8558cSmortimer jmp 2f 63aa797096Sguenther1: 64fe38b55cSguenther SET_ERRNO 65*39b8558cSmortimer2: 66*39b8558cSmortimer RETGUARD_POP(r11); 67*39b8558cSmortimer RETGUARD_CHECK(brk, r11); 68fe38b55cSguenther ret 69aa797096SguentherEND(brk) 709a9a94f4Skettenis .weak brk 71