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 "@(#)sbrk.s 5.1 (Berkeley) 4/23/90" 35#endif /* SYSLIBC_SCCS and not lint */ 36#include <machine/asm.h> 37__FBSDID("$FreeBSD: releng/10.2/lib/libc/i386/sys/sbrk.S 240152 2012-09-05 21:41:05Z jilles $"); 38 39#include "SYS.h" 40 41 .globl CNAME(_end) 42 .globl HIDENAME(minbrk) 43 .globl HIDENAME(curbrk) 44 45 .data 46HIDENAME(minbrk): .long CNAME(_end) 47HIDENAME(curbrk): .long CNAME(_end) 48 .text 49 50ENTRY(sbrk) 51#ifdef PIC 52 movl 4(%esp),%ecx 53 PIC_PROLOGUE 54 movl PIC_GOT(HIDENAME(curbrk)),%edx 55 movl (%edx),%eax 56 PIC_EPILOGUE 57 testl %ecx,%ecx 58 jz back 59 addl %eax,4(%esp) 60 mov $SYS_break,%eax 61 KERNCALL 62 jb HIDENAME(cerror) 63 PIC_PROLOGUE 64 movl PIC_GOT(HIDENAME(curbrk)),%edx 65 movl (%edx),%eax 66 addl %ecx,(%edx) 67 PIC_EPILOGUE 68back: 69 ret 70 71#else /* !PIC */ 72 73 movl 4(%esp),%ecx 74 movl HIDENAME(curbrk),%eax 75 testl %ecx,%ecx 76 jz back 77 addl %eax,4(%esp) 78 mov $SYS_break,%eax 79 KERNCALL 80 jb HIDENAME(cerror) 81 movl HIDENAME(curbrk),%eax 82 addl %ecx,HIDENAME(curbrk) 83back: 84 ret 85#endif /* PIC */ 86END(sbrk) 87 88 .section .note.GNU-stack,"",%progbits 89