sbrk.S revision 92999
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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#if defined(SYSLIBC_SCCS) && !defined(lint) 38 .asciz "@(#)sbrk.s 5.1 (Berkeley) 4/23/90" 39#endif /* SYSLIBC_SCCS and not lint */ 40#include <machine/asm.h> 41__FBSDID("$FreeBSD: head/lib/libc/amd64/sys/sbrk.S 92999 2002-03-23 02:10:28Z obrien $"); 42 43#include "SYS.h" 44 45 .globl CNAME(end) 46 .globl HIDENAME(minbrk) 47 .globl HIDENAME(curbrk) 48 49 .data 50HIDENAME(minbrk): .long CNAME(end) 51HIDENAME(curbrk): .long CNAME(end) 52 .text 53 54ENTRY(sbrk) 55#ifdef PIC 56 movl 4(%esp),%ecx 57 PIC_PROLOGUE 58 movl PIC_GOT(HIDENAME(curbrk)),%edx 59 movl (%edx),%eax 60 PIC_EPILOGUE 61 testl %ecx,%ecx 62 jz back 63 addl %eax,4(%esp) 64 mov $SYS_break,%eax 65 KERNCALL 66 jb err 67 PIC_PROLOGUE 68 movl PIC_GOT(HIDENAME(curbrk)),%edx 69 movl (%edx),%eax 70 addl %ecx,(%edx) 71 PIC_EPILOGUE 72back: 73 ret 74err: 75 PIC_PROLOGUE 76 jmp PIC_PLT(HIDENAME(cerror)) 77 78#else /* !PIC */ 79 80 movl 4(%esp),%ecx 81 movl HIDENAME(curbrk),%eax 82 testl %ecx,%ecx 83 jz back 84 addl %eax,4(%esp) 85 mov $SYS_break,%eax 86 KERNCALL 87 jb err 88 movl HIDENAME(curbrk),%eax 89 addl %ecx,HIDENAME(curbrk) 90back: 91 ret 92err: 93 jmp HIDENAME(cerror) 94#endif /* PIC */ 95