1/*
2 * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
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 *
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
15 *    the documentation and/or other materials provided with the
16 *    distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 *    contributors may be used to endorse or promote products derived
19 *    from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $DragonFly: src/sys/platform/vkernel/i386/locore.s,v 1.6 2007/01/08 03:33:43 dillon Exp $
35 */
36
37#include <sys/syscall.h>
38#include <machine/asmacros.h>
39#include <machine/psl.h>
40#include "assym.s"
41
42	/*
43	 * The sysinit and sysuninit sections have to be read-write data
44	 * sections, not read-only data sections.
45	 */
46	.section	set_sysinit_set, "aw"
47	.section	set_sysuninit_set, "aw"
48
49	.data
50	ALIGN_DATA		/* just to be sure */
51
52	/*
53	 * Normally the startup code would begin here, but this is a
54	 * virtual kernel so we just have a main() in platform/init.c
55	 */
56
57	.text
58/**********************************************************************
59 *
60 * Signal trampoline, copied to top of user stack
61 *
62 * arguments: %rdi, %rsi, %rdx, %rcx
63 */
64NON_GPROF_ENTRY(sigcode)
65	call	*SIGF_HANDLER(%rsp)	/* call signal handler */
66	lea	SIGF_UC(%rsp),%rdi	/* get ucontext_t */
67	pushq	$0			/* junk to fake return addr. */
68	movq	$SYS_sigreturn,%rax
69	syscall				/* enter kernel with args */
700:	hlt				/* trap priviliged instruction */
71	jmp	0b
72
73	ALIGN_TEXT
74esigcode:
75
76/* void reset_dbregs() */
77ENTRY(reset_dbregs)
78	movq	$0x200,%rax	/* the manual says that bit 10 must be set to 1 */
79	movq	%rax,%dr7	/* disable all breapoints first */
80	movq	$0,%rax
81	movq	%rax,%dr0
82	movq	%rax,%dr1
83	movq	%rax,%dr2
84	movq	%rax,%dr3
85	movq	%rax,%dr6
86	ret
87END(reset_dbregs)
88
89	.data
90	.globl	szsigcode
91szsigcode:
92	.long	esigcode - sigcode
93