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
35#include <sys/syscall.h>
36#include <machine/asmacros.h>
37#include <machine/psl.h>
38#include "assym.s"
39
40	/*
41	 * The sysinit and sysuninit sections have to be read-write data
42	 * sections, not read-only data sections.
43	 */
44	.section	set_sysinit_set, "aw"
45	.section	set_sysuninit_set, "aw"
46
47	.data
48	ALIGN_DATA		/* just to be sure */
49
50	/*
51	 * Normally the startup code would begin here, but this is a
52	 * virtual kernel so we just have a main() in platform/init.c
53	 */
54
55	.text
56/**********************************************************************
57 *
58 * Signal trampoline, copied to top of user stack
59 *
60 * arguments: %rdi, %rsi, %rdx, %rcx
61 */
62NON_GPROF_ENTRY(sigcode)
63	call	*SIGF_HANDLER(%rsp)	/* call signal handler */
64	lea	SIGF_UC(%rsp),%rdi	/* get ucontext_t */
65	pushq	$0			/* junk to fake return addr. */
66	movq	$SYS_sigreturn,%rax
67	syscall				/* enter kernel with args */
680:	hlt				/* trap priviliged instruction */
69	jmp	0b
70
71	ALIGN_TEXT
72esigcode:
73
74/* void reset_dbregs() */
75ENTRY(reset_dbregs)
76	movq	$0x200,%rax	/* the manual says that bit 10 must be set to 1 */
77	movq	%rax,%dr7	/* disable all breapoints first */
78	movq	$0,%rax
79	movq	%rax,%dr0
80	movq	%rax,%dr1
81	movq	%rax,%dr2
82	movq	%rax,%dr3
83	movq	%rax,%dr6
84	ret
85END(reset_dbregs)
86
87	.data
88	.globl	szsigcode
89szsigcode:
90	.long	esigcode - sigcode
91