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1 /*
2  *  arch/arm/include/asm/thread_info.h
3  *
4  *  Copyright (C) 2002 Russell King.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #ifndef __ASM_ARM_THREAD_INFO_H
11 #define __ASM_ARM_THREAD_INFO_H
12 
13 #ifdef __KERNEL__
14 
15 #include <linux/compiler.h>
16 #include <asm/fpstate.h>
17 #include <asm/page.h>
18 
19 #define THREAD_SIZE_ORDER	1
20 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
21 #define THREAD_START_SP		(THREAD_SIZE - 8)
22 
23 #ifndef __ASSEMBLY__
24 
25 struct task_struct;
26 
27 #include <asm/types.h>
28 
29 typedef unsigned long mm_segment_t;
30 
31 struct cpu_context_save {
32 	__u32	r4;
33 	__u32	r5;
34 	__u32	r6;
35 	__u32	r7;
36 	__u32	r8;
37 	__u32	r9;
38 	__u32	sl;
39 	__u32	fp;
40 	__u32	sp;
41 	__u32	pc;
42 	__u32	extra[2];		/* Xscale 'acc' register, etc */
43 };
44 
45 /*
46  * low level task data that entry.S needs immediate access to.
47  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
48  */
49 struct thread_info {
50 	unsigned long		flags;		/* low level flags */
51 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
52 	mm_segment_t		addr_limit;	/* address limit */
53 	struct task_struct	*task;		/* main task structure */
54 	__u32			cpu;		/* cpu */
55 	__u32			cpu_domain;	/* cpu domain */
56 	struct cpu_context_save	cpu_context;	/* cpu context */
57 	__u32			syscall;	/* syscall number */
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)));
64 	union vfp_state		vfpstate;
65 #ifdef CONFIG_ARM_THUMBEE
66 	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
67 #endif
68 };
69 
70 #define INIT_THREAD_INFO(tsk)						\
71 {									\
72 	.task		= &tsk,						\
73 	.flags		= 0,						\
74 	.preempt_count	= INIT_PREEMPT_COUNT,				\
75 	.addr_limit	= KERNEL_DS,					\
76 }
77 
78 #define init_thread_info	(init_thread_union.thread_info)
79 #define init_stack		(init_thread_union.stack)
80 
81 /*
82  * how to get the current stack pointer in C
83  */
84 register unsigned long current_stack_pointer asm ("sp");
85 
86 /*
87  * how to get the thread information struct from C
88  */
89 static inline struct thread_info *current_thread_info(void) __attribute_const__;
90 
current_thread_info(void)91 static inline struct thread_info *current_thread_info(void)
92 {
93 	return (struct thread_info *)
94 		(current_stack_pointer & ~(THREAD_SIZE - 1));
95 }
96 
97 #define thread_saved_pc(tsk)	\
98 	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
99 #define thread_saved_sp(tsk)	\
100 	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
101 
102 #ifndef CONFIG_THUMB2_KERNEL
103 #define thread_saved_fp(tsk)	\
104 	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
105 #else
106 #define thread_saved_fp(tsk)	\
107 	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
108 #endif
109 
110 extern void crunch_task_disable(struct thread_info *);
111 extern void crunch_task_copy(struct thread_info *, void *);
112 extern void crunch_task_restore(struct thread_info *, void *);
113 extern void crunch_task_release(struct thread_info *);
114 
115 extern void iwmmxt_task_disable(struct thread_info *);
116 extern void iwmmxt_task_copy(struct thread_info *, void *);
117 extern void iwmmxt_task_restore(struct thread_info *, void *);
118 extern void iwmmxt_task_release(struct thread_info *);
119 extern void iwmmxt_task_switch(struct thread_info *);
120 
121 extern void vfp_sync_hwstate(struct thread_info *);
122 extern void vfp_flush_hwstate(struct thread_info *);
123 
124 struct user_vfp;
125 struct user_vfp_exc;
126 
127 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
128 					   struct user_vfp_exc *);
129 extern int vfp_restore_user_hwstate(struct user_vfp *,
130 				    struct user_vfp_exc *);
131 #endif
132 
133 /*
134  * thread information flags:
135  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
136  *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
137  */
138 #define TIF_SIGPENDING		0	/* signal pending */
139 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
140 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
141 #define TIF_UPROBE		3	/* breakpointed or singlestepping */
142 #define TIF_SYSCALL_TRACE	4	/* syscall trace active */
143 #define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
144 #define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
145 #define TIF_SECCOMP		7	/* seccomp syscall filtering active */
146 
147 #define TIF_NOHZ		12	/* in adaptive nohz mode */
148 #define TIF_USING_IWMMXT	17
149 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
150 #define TIF_RESTORE_SIGMASK	20
151 
152 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
153 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
154 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
155 #define _TIF_UPROBE		(1 << TIF_UPROBE)
156 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
157 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
158 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
159 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
160 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
161 
162 /* Checks for any syscall work in entry-common.S */
163 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
164 			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
165 
166 /*
167  * Change these and you break ASM code in entry-common.S
168  */
169 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
170 				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
171 
172 #endif /* __KERNEL__ */
173 #endif /* __ASM_ARM_THREAD_INFO_H */
174