1/* $NetBSD: brk.S,v 1.1 2001/06/19 00:25:06 fvdl 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)brk.s 5.2 (Berkeley) 12/17/90 39 */ 40 41#include <machine/asm.h> 42#if defined(SYSLIBC_SCCS) && !defined(lint) 43 RCSID("$NetBSD: brk.S,v 1.1 2001/06/19 00:25:06 fvdl Exp $") 44#endif /* SYSLIBC_SCCS and not lint */ 45 46#include "SYS.h" 47 48 .globl _end 49 .globl _C_LABEL(__minbrk) 50 .globl CURBRK 51 52#ifdef WEAK_ALIAS 53WEAK_ALIAS(brk, _brk) 54#endif 55 56 .data 57_C_LABEL(__minbrk): 58 .quad _end 59 .text 60 61ENTRY(_brk) 62#ifdef PIC 63 movq PIC_GOT(_C_LABEL(__minbrk)),%rdx 64 cmpq %rdi,(%rdx) 65 jb 1f 66 movq (%rdx),%rdi 671: 68 SYSTRAP(break) 69 jc err 70 movq PIC_GOT(CURBRK),%rdx # set up GOT addressing 71 movl %ecx,(%rdx) 72 xorl %eax,%eax 73 ret 74err: 75 movq PIC_GOT(CERROR),%rdx 76 jmp *%rdx 77#else 78 cmpq %rdi,_C_LABEL(__minbrk)(%rip) 79 jb 1f 80 movq _C_LABEL(__minbrk)(%rip),%rdi 811: 82 SYSTRAP(break) 83 jc err 84 movq %rdi,CURBRK(%rip) 85 xorl %eax,%eax 86 ret 87err: 88 jmp CERROR 89#endif 90