2 * arch/arm/include/asm/thread_info.h
4 * Copyright (C) 2002 Russell King.
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.
10 #ifndef __ASM_ARM_THREAD_INFO_H
11 #define __ASM_ARM_THREAD_INFO_H
15 #include <linux/compiler.h>
16 #include <asm/fpstate.h>
19 #define THREAD_SIZE_ORDER 1
20 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
21 #define THREAD_START_SP (THREAD_SIZE - 8)
27 #include <asm/types.h>
28 #include <asm/domain.h>
30 typedef unsigned long mm_segment_t;
32 struct cpu_context_save {
43 __u32 extra[2]; /* Xscale 'acc' register, etc */
47 * low level task data that entry.S needs immediate access to.
48 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
51 unsigned long flags; /* low level flags */
52 int preempt_count; /* 0 => preemptable, <0 => bug */
53 mm_segment_t addr_limit; /* address limit */
54 struct task_struct *task; /* main task structure */
56 __u32 cpu_domain; /* cpu domain */
57 struct cpu_context_save cpu_context; /* cpu context */
58 __u32 syscall; /* syscall number */
59 __u8 used_cp[16]; /* thread used copro */
60 unsigned long tp_value[2]; /* TLS registers */
62 struct crunch_state crunchstate;
64 union fp_state fpstate __attribute__((aligned(8)));
65 union vfp_state vfpstate;
66 #ifdef CONFIG_ARM_THUMBEE
67 unsigned long thumbee_state; /* ThumbEE Handler Base register */
71 #define INIT_THREAD_INFO(tsk) \
75 .preempt_count = INIT_PREEMPT_COUNT, \
76 .addr_limit = KERNEL_DS, \
79 #define init_thread_info (init_thread_union.thread_info)
80 #define init_stack (init_thread_union.stack)
83 * how to get the current stack pointer in C
85 register unsigned long current_stack_pointer asm ("sp");
88 * how to get the thread information struct from C
90 static inline struct thread_info *current_thread_info(void) __attribute_const__;
92 static inline struct thread_info *current_thread_info(void)
94 return (struct thread_info *)
95 (current_stack_pointer & ~(THREAD_SIZE - 1));
98 #define thread_saved_pc(tsk) \
99 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
100 #define thread_saved_sp(tsk) \
101 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
103 #ifndef CONFIG_THUMB2_KERNEL
104 #define thread_saved_fp(tsk) \
105 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
107 #define thread_saved_fp(tsk) \
108 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
111 extern void crunch_task_disable(struct thread_info *);
112 extern void crunch_task_copy(struct thread_info *, void *);
113 extern void crunch_task_restore(struct thread_info *, void *);
114 extern void crunch_task_release(struct thread_info *);
116 extern void iwmmxt_task_disable(struct thread_info *);
117 extern void iwmmxt_task_copy(struct thread_info *, void *);
118 extern void iwmmxt_task_restore(struct thread_info *, void *);
119 extern void iwmmxt_task_release(struct thread_info *);
120 extern void iwmmxt_task_switch(struct thread_info *);
122 extern void vfp_sync_hwstate(struct thread_info *);
123 extern void vfp_flush_hwstate(struct thread_info *);
128 extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
129 struct user_vfp_exc __user *);
130 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
131 struct user_vfp_exc __user *);
135 * thread information flags:
136 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
137 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
139 #define TIF_SIGPENDING 0 /* signal pending */
140 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
141 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
142 #define TIF_UPROBE 3 /* breakpointed or singlestepping */
143 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
144 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
145 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
146 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
148 #define TIF_NOHZ 12 /* in adaptive nohz mode */
149 #define TIF_USING_IWMMXT 17
150 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
151 #define TIF_RESTORE_SIGMASK 20
153 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
154 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
155 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
156 #define _TIF_UPROBE (1 << TIF_UPROBE)
157 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
158 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
159 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
160 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
161 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
163 /* Checks for any syscall work in entry-common.S */
164 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
165 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
168 * Change these and you break ASM code in entry-common.S
170 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
171 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
173 #endif /* __KERNEL__ */
174 #endif /* __ASM_ARM_THREAD_INFO_H */