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 /*
79 * how to get the current stack pointer in C
80 */
81 register unsigned long current_stack_pointer asm ("sp");
82
83 /*
84 * how to get the thread information struct from C
85 */
86 static inline struct thread_info *current_thread_info(void) __attribute_const__;
87
current_thread_info(void)88 static inline struct thread_info *current_thread_info(void)
89 {
90 return (struct thread_info *)
91 (current_stack_pointer & ~(THREAD_SIZE - 1));
92 }
93
94 #define thread_saved_pc(tsk) \
95 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
96 #define thread_saved_sp(tsk) \
97 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
98
99 #ifndef CONFIG_THUMB2_KERNEL
100 #define thread_saved_fp(tsk) \
101 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
102 #else
103 #define thread_saved_fp(tsk) \
104 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
105 #endif
106
107 extern void crunch_task_disable(struct thread_info *);
108 extern void crunch_task_copy(struct thread_info *, void *);
109 extern void crunch_task_restore(struct thread_info *, void *);
110 extern void crunch_task_release(struct thread_info *);
111
112 extern void iwmmxt_task_disable(struct thread_info *);
113 extern void iwmmxt_task_copy(struct thread_info *, void *);
114 extern void iwmmxt_task_restore(struct thread_info *, void *);
115 extern void iwmmxt_task_release(struct thread_info *);
116 extern void iwmmxt_task_switch(struct thread_info *);
117
118 extern void vfp_sync_hwstate(struct thread_info *);
119 extern void vfp_flush_hwstate(struct thread_info *);
120
121 struct user_vfp;
122 struct user_vfp_exc;
123
124 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
125 struct user_vfp_exc __user *);
126 extern int vfp_restore_user_hwstate(struct user_vfp *,
127 struct user_vfp_exc *);
128 #endif
129
130 /*
131 * thread information flags:
132 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
133 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
134 */
135 #define TIF_SIGPENDING 0 /* signal pending */
136 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
137 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
138 #define TIF_UPROBE 3 /* breakpointed or singlestepping */
139 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
140 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
141 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
142 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
143
144 #define TIF_NOHZ 12 /* in adaptive nohz mode */
145 #define TIF_USING_IWMMXT 17
146 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
147 #define TIF_RESTORE_SIGMASK 20
148
149 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
150 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
151 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
152 #define _TIF_UPROBE (1 << TIF_UPROBE)
153 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
154 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
155 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
156 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
157 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
158
159 /* Checks for any syscall work in entry-common.S */
160 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
161 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
162
163 /*
164 * Change these and you break ASM code in entry-common.S
165 */
166 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
167 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
168
169 #endif /* __KERNEL__ */
170 #endif /* __ASM_ARM_THREAD_INFO_H */
171
