1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if defined(SYSLIBC_SCCS) && !defined(lint) 34 .asciz "@(#)brk.s 5.2 (Berkeley) 12/17/90" 35#endif /* SYSLIBC_SCCS and not lint */ 36#include <machine/asm.h> 37__FBSDID("$FreeBSD: releng/10.2/lib/libc/i386/sys/brk.S 240152 2012-09-05 21:41:05Z jilles $"); 38 39#include "SYS.h" 40 41 .globl HIDENAME(curbrk) 42 .globl HIDENAME(minbrk) 43ENTRY(_brk) 44 jmp ok 45END(_brk) 46 47ENTRY(brk) 48#ifdef PIC 49 movl 4(%esp),%eax 50 PIC_PROLOGUE 51 movl PIC_GOT(HIDENAME(curbrk)),%edx # set up GOT addressing 52 movl PIC_GOT(HIDENAME(minbrk)),%ecx # 53 PIC_EPILOGUE 54 cmpl %eax,(%ecx) 55 jbe ok 56 movl (%ecx),%eax 57 movl %eax,4(%esp) 58ok: 59 mov $SYS_break,%eax 60 KERNCALL 61 jb HIDENAME(cerror) 62 movl 4(%esp),%eax 63 movl %eax,(%edx) 64 movl $0,%eax 65 ret 66 67#else 68 69 movl 4(%esp),%eax 70 cmpl %eax,HIDENAME(minbrk) 71 jbe ok 72 movl HIDENAME(minbrk),%eax 73 movl %eax,4(%esp) 74ok: 75 mov $SYS_break,%eax 76 KERNCALL 77 jb HIDENAME(cerror) 78 movl 4(%esp),%eax 79 movl %eax,HIDENAME(curbrk) 80 movl $0,%eax 81 ret 82#endif 83END(brk) 84 85 .section .note.GNU-stack,"",%progbits 86