1/*	$NetBSD: mcontext.h,v 1.9 2011/02/24 04:28:46 joerg Exp $	*/
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Klaus Klein.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _I386_MCONTEXT_H_
33#define _I386_MCONTEXT_H_
34
35
36/*
37 * mcontext extensions to handle signal delivery.
38 */
39#define _UC_SETSTACK	0x00010000
40#define _UC_CLRSTACK	0x00020000
41#define _UC_VM		0x00040000
42#define	_UC_TLSBASE	0x00080000
43
44/*
45 * Layout of mcontext_t according to the System V Application Binary Interface,
46 * Intel386(tm) Architecture Processor Supplement, Fourth Edition.
47 */
48
49/*
50 * General register state
51 */
52#define _NGREG		19
53typedef	int		__greg_t;
54typedef	__greg_t	__gregset_t[_NGREG];
55
56#define _REG_GS		0
57#define _REG_FS		1
58#define _REG_ES		2
59#define _REG_DS		3
60#define _REG_EDI	4
61#define _REG_ESI	5
62#define _REG_EBP	6
63#define _REG_ESP	7
64#define _REG_EBX	8
65#define _REG_EDX	9
66#define _REG_ECX	10
67#define _REG_EAX	11
68#define _REG_TRAPNO	12
69#define _REG_ERR	13
70#define _REG_EIP	14
71#define _REG_CS		15
72#define _REG_EFL	16
73#define _REG_UESP	17
74#define _REG_SS		18
75
76/*
77 * Floating point register state
78 */
79typedef struct {
80	union {
81		struct {
82			int	__fp_state[27];	/* Environment and registers */
83			int	__fp_status;	/* Software status word */
84		} __fpchip_state;
85		struct {
86			char	__fp_emul[246];
87			char	__fp_epad[2];
88		} __fp_emul_space;
89		struct {
90			char	__fp_xmm[512];
91		} __fp_xmm_state;
92		int	__fp_fpregs[128];
93	} __fp_reg_set;
94	long	__fp_wregs[33];			/* Weitek? */
95} __fpregset_t;
96
97typedef struct {
98	__gregset_t	__gregs;
99	__fpregset_t	__fpregs;
100	__greg_t	_mc_tlsbase;
101} mcontext_t;
102
103#define _UC_FXSAVE	0x20	/* FP state is in FXSAVE format in XMM space */
104
105#define _UC_MACHINE_PAD	4	/* Padding appended to ucontext_t */
106
107#define _UC_UCONTEXT_ALIGN	(~0xf)
108
109#ifdef _KERNEL_OPT
110#include "opt_vm86.h"
111#ifdef VM86
112/*#include <machine/psl.h>*/
113#define PSL_VM 0x00020000
114#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_UESP] + \
115	((uc)->uc_mcontext.__gregs[_REG_EFL] & PSL_VM ? \
116	 ((uc)->uc_mcontext.__gregs[_REG_SS] << 4) : 0))
117#endif /* VM86 */
118#endif /* _KERNEL_OPT */
119
120#ifndef _UC_MACHINE_SP
121#define _UC_MACHINE_SP(uc)	((uc)->uc_mcontext.__gregs[_REG_UESP])
122#endif
123#define _UC_MACHINE_PC(uc)	((uc)->uc_mcontext.__gregs[_REG_EIP])
124#define _UC_MACHINE_INTRV(uc)	((uc)->uc_mcontext.__gregs[_REG_EAX])
125
126#define	_UC_MACHINE_SET_PC(uc, pc)	_UC_MACHINE_PC(uc) = (pc)
127
128#define	__UCONTEXT_SIZE	776
129
130static __inline void *
131__lwp_getprivate_fast(void)
132{
133	void *__tmp;
134
135	__asm volatile("movl %%gs:0, %0" : "=r" (__tmp));
136
137	return __tmp;
138}
139
140#endif	/* !_I386_MCONTEXT_H_ */
141