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("$FreeBSD$"); 38 39#include "SYS.h" 40 41 .globl HIDENAME(curbrk) 42 .globl HIDENAME(minbrk) 43ENTRY(_brk) 44 pushq %rdi 45 jmp ok 46END(_brk) 47 48ENTRY(brk) 49 pushq %rdi 50 movq %rdi,%rax 51#ifdef PIC 52 movq PIC_GOT(HIDENAME(minbrk)),%rdx 53 cmpq %rax,(%rdx) 54#else 55 cmpq %rax,HIDENAME(minbrk)(%rip) 56#endif 57 jbe ok 58#ifdef PIC 59 movq (%rdx),%rdi 60#else 61 movq HIDENAME(minbrk)(%rip),%rdi 62#endif 63ok: 64 movq $SYS_break,%rax 65 KERNCALL 66 jb err 67 movq 0(%rsp),%rax 68#ifdef PIC 69 movq PIC_GOT(HIDENAME(curbrk)),%rdx 70 movq %rax,(%rdx) 71#else 72 movq %rax,HIDENAME(curbrk)(%rip) 73#endif 74 movq $0,%rax 75 popq %rdi 76 ret 77err: 78 addq $8, %rsp 79 jmp HIDENAME(cerror) 80END(brk) 81 82 .section .note.GNU-stack,"",%progbits 83