thread_info.h 5.27 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
 *  arch/arm/include/asm/thread_info.h
Linus Torvalds's avatar
Linus Torvalds committed
3
4
5
6
7
8
9
10
11
12
13
14
 *
 *  Copyright (C) 2002 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_ARM_THREAD_INFO_H
#define __ASM_ARM_THREAD_INFO_H

#ifdef __KERNEL__

15
#include <linux/compiler.h>
Linus Torvalds's avatar
Linus Torvalds committed
16
#include <asm/fpstate.h>
17
#include <asm/page.h>
Linus Torvalds's avatar
Linus Torvalds committed
18

19
#define THREAD_SIZE_ORDER	1
20
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
21
22
#define THREAD_START_SP		(THREAD_SIZE - 8)

Linus Torvalds's avatar
Linus Torvalds committed
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
#ifndef __ASSEMBLY__

struct task_struct;

#include <asm/types.h>

typedef unsigned long mm_segment_t;

struct cpu_context_save {
	__u32	r4;
	__u32	r5;
	__u32	r6;
	__u32	r7;
	__u32	r8;
	__u32	r9;
	__u32	sl;
	__u32	fp;
	__u32	sp;
	__u32	pc;
	__u32	extra[2];		/* Xscale 'acc' register, etc */
};

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
	unsigned long		flags;		/* low level flags */
51
	int			preempt_count;	/* 0 => preemptable, <0 => bug */
Linus Torvalds's avatar
Linus Torvalds committed
52
53
54
55
56
	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	__u32			cpu;		/* cpu */
	__u32			cpu_domain;	/* cpu domain */
	struct cpu_context_save	cpu_context;	/* cpu context */
57
	__u32			syscall;	/* syscall number */
Linus Torvalds's avatar
Linus Torvalds committed
58
	__u8			used_cp[16];	/* thread used copro */
59
	unsigned long		tp_value[2];	/* TLS registers */
60
#ifdef CONFIG_CRUNCH
61
	struct crunch_state	crunchstate;
62
#endif
63
	union fp_state		fpstate __attribute__((aligned(8)));
Linus Torvalds's avatar
Linus Torvalds committed
64
	union vfp_state		vfpstate;
65
66
67
#ifdef CONFIG_ARM_THUMBEE
	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
#endif
Linus Torvalds's avatar
Linus Torvalds committed
68
69
70
71
72
73
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.flags		= 0,						\
Peter Zijlstra's avatar
Peter Zijlstra committed
74
	.preempt_count	= INIT_PREEMPT_COUNT,				\
Linus Torvalds's avatar
Linus Torvalds committed
75
76
77
78
79
80
	.addr_limit	= KERNEL_DS,					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

81
82
83
84
85
/*
 * how to get the current stack pointer in C
 */
register unsigned long current_stack_pointer asm ("sp");

Linus Torvalds's avatar
Linus Torvalds committed
86
87
88
89
90
91
92
/*
 * how to get the thread information struct from C
 */
static inline struct thread_info *current_thread_info(void) __attribute_const__;

static inline struct thread_info *current_thread_info(void)
{
93
94
	return (struct thread_info *)
		(current_stack_pointer & ~(THREAD_SIZE - 1));
Linus Torvalds's avatar
Linus Torvalds committed
95
96
97
}

#define thread_saved_pc(tsk)	\
Russell King's avatar
Russell King committed
98
	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
99
100
#define thread_saved_sp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
101
102

#ifndef CONFIG_THUMB2_KERNEL
Linus Torvalds's avatar
Linus Torvalds committed
103
#define thread_saved_fp(tsk)	\
Al Viro's avatar
Al Viro committed
104
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
105
106
107
108
#else
#define thread_saved_fp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
#endif
Linus Torvalds's avatar
Linus Torvalds committed
109

110
111
112
113
114
extern void crunch_task_disable(struct thread_info *);
extern void crunch_task_copy(struct thread_info *, void *);
extern void crunch_task_restore(struct thread_info *, void *);
extern void crunch_task_release(struct thread_info *);

Linus Torvalds's avatar
Linus Torvalds committed
115
116
117
118
extern void iwmmxt_task_disable(struct thread_info *);
extern void iwmmxt_task_copy(struct thread_info *, void *);
extern void iwmmxt_task_restore(struct thread_info *, void *);
extern void iwmmxt_task_release(struct thread_info *);
119
extern void iwmmxt_task_switch(struct thread_info *);
Linus Torvalds's avatar
Linus Torvalds committed
120

121
122
extern void vfp_sync_hwstate(struct thread_info *);
extern void vfp_flush_hwstate(struct thread_info *);
123

124
125
126
127
128
129
130
struct user_vfp;
struct user_vfp_exc;

extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
					   struct user_vfp_exc __user *);
extern int vfp_restore_user_hwstate(struct user_vfp __user *,
				    struct user_vfp_exc __user *);
Linus Torvalds's avatar
Linus Torvalds committed
131
132
133
134
135
#endif

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE	- syscall trace active
136
 *  TIF_SYSCAL_AUDIT	- syscall auditing active
Linus Torvalds's avatar
Linus Torvalds committed
137
138
 *  TIF_SIGPENDING	- signal pending
 *  TIF_NEED_RESCHED	- rescheduling necessary
139
 *  TIF_NOTIFY_RESUME	- callback before returning to user
Linus Torvalds's avatar
Linus Torvalds committed
140
141
142
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
143
144
#define TIF_SIGPENDING		0
#define TIF_NEED_RESCHED	1
145
#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
David A. Long's avatar
David A. Long committed
146
#define TIF_UPROBE		7
Linus Torvalds's avatar
Linus Torvalds committed
147
#define TIF_SYSCALL_TRACE	8
148
#define TIF_SYSCALL_AUDIT	9
149
#define TIF_SYSCALL_TRACEPOINT	10
150
#define TIF_SECCOMP		11	/* seccomp syscall filtering active */
151
#define TIF_NOHZ		12	/* in adaptive nohz mode */
Linus Torvalds's avatar
Linus Torvalds committed
152
#define TIF_USING_IWMMXT	17
153
#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
154
#define TIF_RESTORE_SIGMASK	20
Linus Torvalds's avatar
Linus Torvalds committed
155
156
157

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
158
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
David A. Long's avatar
David A. Long committed
159
#define _TIF_UPROBE		(1 << TIF_UPROBE)
Linus Torvalds's avatar
Linus Torvalds committed
160
#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
161
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
162
#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
Nicolas Pitre's avatar
Nicolas Pitre committed
163
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
164
#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
Linus Torvalds's avatar
Linus Torvalds committed
165

166
/* Checks for any syscall work in entry-common.S */
167
168
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
169

Linus Torvalds's avatar
Linus Torvalds committed
170
171
172
/*
 * Change these and you break ASM code in entry-common.S
 */
David A. Long's avatar
David A. Long committed
173
174
#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
Linus Torvalds's avatar
Linus Torvalds committed
175
176
177

#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */