[PATCH] ARM: Fix kernel stack offset calculations
[linux-3.10.git] / include / asm-arm / thread_info.h
1 /*
2  *  linux/include/asm-arm/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 <asm/fpstate.h>
16
17 #define THREAD_SIZE_ORDER       1
18 #define THREAD_SIZE             8192
19 #define THREAD_START_SP         (THREAD_SIZE - 8)
20
21 #ifndef __ASSEMBLY__
22
23 struct task_struct;
24 struct exec_domain;
25
26 #include <asm/ptrace.h>
27 #include <asm/types.h>
28 #include <asm/domain.h>
29
30 typedef unsigned long mm_segment_t;
31
32 struct cpu_context_save {
33         __u32   r4;
34         __u32   r5;
35         __u32   r6;
36         __u32   r7;
37         __u32   r8;
38         __u32   r9;
39         __u32   sl;
40         __u32   fp;
41         __u32   sp;
42         __u32   pc;
43         __u32   extra[2];               /* Xscale 'acc' register, etc */
44 };
45
46 /*
47  * low level task data that entry.S needs immediate access to.
48  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
49  */
50 struct thread_info {
51         unsigned long           flags;          /* low level flags */
52         __s32                   preempt_count;  /* 0 => preemptable, <0 => bug */
53         mm_segment_t            addr_limit;     /* address limit */
54         struct task_struct      *task;          /* main task structure */
55         struct exec_domain      *exec_domain;   /* execution domain */
56         __u32                   cpu;            /* cpu */
57         __u32                   cpu_domain;     /* cpu domain */
58         struct cpu_context_save cpu_context;    /* cpu context */
59         __u8                    used_cp[16];    /* thread used copro */
60         unsigned long           tp_value;
61         union fp_state          fpstate;
62         union vfp_state         vfpstate;
63         struct restart_block    restart_block;
64 };
65
66 #define INIT_THREAD_INFO(tsk)                                           \
67 {                                                                       \
68         .task           = &tsk,                                         \
69         .exec_domain    = &default_exec_domain,                         \
70         .flags          = 0,                                            \
71         .preempt_count  = 1,                                            \
72         .addr_limit     = KERNEL_DS,                                    \
73         .cpu_domain     = domain_val(DOMAIN_USER, DOMAIN_MANAGER) |     \
74                           domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |   \
75                           domain_val(DOMAIN_IO, DOMAIN_CLIENT),         \
76         .restart_block  = {                                             \
77                 .fn     = do_no_restart_syscall,                        \
78         },                                                              \
79 }
80
81 #define init_thread_info        (init_thread_union.thread_info)
82 #define init_stack              (init_thread_union.stack)
83
84 /*
85  * how to get the thread information struct from C
86  */
87 static inline struct thread_info *current_thread_info(void) __attribute_const__;
88
89 static inline struct thread_info *current_thread_info(void)
90 {
91         register unsigned long sp asm ("sp");
92         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
93 }
94
95 extern struct thread_info *alloc_thread_info(struct task_struct *task);
96 extern void free_thread_info(struct thread_info *);
97
98 #define get_thread_info(ti)     get_task_struct((ti)->task)
99 #define put_thread_info(ti)     put_task_struct((ti)->task)
100
101 #define thread_saved_pc(tsk)    \
102         ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc)))
103 #define thread_saved_fp(tsk)    \
104         ((unsigned long)((tsk)->thread_info->cpu_context.fp))
105
106 extern void iwmmxt_task_disable(struct thread_info *);
107 extern void iwmmxt_task_copy(struct thread_info *, void *);
108 extern void iwmmxt_task_restore(struct thread_info *, void *);
109 extern void iwmmxt_task_release(struct thread_info *);
110
111 #endif
112
113 /*
114  * We use bit 30 of the preempt_count to indicate that kernel
115  * preemption is occuring.  See include/asm-arm/hardirq.h.
116  */
117 #define PREEMPT_ACTIVE  0x40000000
118
119 /*
120  * thread information flags:
121  *  TIF_SYSCALL_TRACE   - syscall trace active
122  *  TIF_NOTIFY_RESUME   - resumption notification requested
123  *  TIF_SIGPENDING      - signal pending
124  *  TIF_NEED_RESCHED    - rescheduling necessary
125  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
126  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
127  */
128 #define TIF_NOTIFY_RESUME       0
129 #define TIF_SIGPENDING          1
130 #define TIF_NEED_RESCHED        2
131 #define TIF_SYSCALL_TRACE       8
132 #define TIF_POLLING_NRFLAG      16
133 #define TIF_USING_IWMMXT        17
134 #define TIF_MEMDIE              18
135
136 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
137 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
138 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
139 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
140 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
141 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
142
143 /*
144  * Change these and you break ASM code in entry-common.S
145  */
146 #define _TIF_WORK_MASK          0x000000ff
147
148 #endif /* __KERNEL__ */
149 #endif /* __ASM_ARM_THREAD_INFO_H */