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. 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 * @(#)sbrk.s 5.1 (Berkeley) 4/23/90 33 * $FreeBSD: src/lib/libc/amd64/sys/sbrk.S,v 1.15 2008/11/02 01:10:54 peter Exp $ 34 */ 35 36#include <machine/asm.h> 37#include "SYS.h" 38 39 .globl CNAME(_end) 40 .globl HIDENAME(minbrk) 41 .globl HIDENAME(curbrk) 42 43 .data 44HIDENAME(minbrk): .quad CNAME(_end) 45HIDENAME(curbrk): .quad CNAME(_end) 46 .text 47 48ENTRY(fake_sbrk) 49 pushq %rdi 50 movq %rdi,%rcx 51#ifdef PIC 52 movq PIC_GOT(HIDENAME(curbrk)),%rdx 53 movq (%rdx),%rax 54#else 55 movq HIDENAME(curbrk)(%rip),%rax 56#endif 57 testq %rcx,%rcx 58 jz back 59 addq %rax,%rdi 60 mov $SYS_break,%eax 61 KERNCALL 62 jb err 63#ifdef PIC 64 movq PIC_GOT(HIDENAME(curbrk)),%rdx 65 movq (%rdx),%rax 66#else 67 movq HIDENAME(curbrk)(%rip),%rax 68#endif 69 movq 0(%rsp), %rcx 70#ifdef PIC 71 addq %rcx,(%rdx) 72#else 73 addq %rcx,HIDENAME(curbrk)(%rip) 74#endif 75back: 76 addq $8, %rsp 77 ret 78err: 79 addq $8, %rsp 80#ifdef PIC 81 movq PIC_GOT(HIDENAME(cerror)),%rdx 82 jmp *%rdx 83#else 84 jmp HIDENAME(cerror) 85#endif 86END(fake_sbrk) 87 88 .section .note.GNU-stack,"",%progbits 89