1/*- 2 * Copyright (c) 2013 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Benno Rice under sponsorship from 6 * the FreeBSD Foundation. 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#include <machine/asmacros.h> 32 33 .text 34 .globl amd64_tramp 35 36/* 37 * void amd64_tramp(uint64_t stack, void *copy_finish, uint64_t kernend, 38 * uint64_t modulep, uint64_t pagetable, uint64_t entry) 39 */ 40amd64_tramp: 41 cli /* Make sure we don't get interrupted. */ 42 movq %rdi,%rsp /* Switch to our temporary stack. */ 43 44 movq %rdx,%r12 /* Stash the kernel values for later. */ 45 movq %rcx,%r13 46 movq %r8,%r14 47 movq %r9,%r15 48 49 callq *%rsi /* Call copy_finish so we're all ready to go. */ 50 51 pushq %r12 /* Push kernend. */ 52 salq $32,%r13 /* Shift modulep and push it. */ 53 pushq %r13 54 pushq %r15 /* Push the entry address. */ 55 movq %r14,%cr3 /* Switch page tables. */ 56 ret /* "Return" to kernel entry. */ 57 58 ALIGN_TEXT 59amd64_tramp_end: 60 61 .data 62 .globl amd64_tramp_size 63amd64_tramp_size: 64 .long amd64_tramp_end-amd64_tramp 65