Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE
[linux-2.6.git] / include / asm-um / thread_info.h
1 /* 
2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #ifndef __UM_THREAD_INFO_H
7 #define __UM_THREAD_INFO_H
8
9 #ifndef __ASSEMBLY__
10
11 #include <asm/processor.h>
12 #include <asm/types.h>
13
14 struct thread_info {
15         struct task_struct      *task;          /* main task structure */
16         struct exec_domain      *exec_domain;   /* execution domain */
17         unsigned long           flags;          /* low level flags */
18         __u32                   cpu;            /* current CPU */
19         int                     preempt_count;  /* 0 => preemptable,
20                                                    <0 => BUG */
21         mm_segment_t            addr_limit;     /* thread address space:
22                                                    0-0xBFFFFFFF for user
23                                                    0-0xFFFFFFFF for kernel */
24         struct restart_block    restart_block;
25         struct thread_info      *real_thread;    /* Points to non-IRQ stack */
26 };
27
28 #define INIT_THREAD_INFO(tsk)                   \
29 {                                               \
30         .task =         &tsk,                   \
31         .exec_domain =  &default_exec_domain,   \
32         .flags =                0,              \
33         .cpu =          0,                      \
34         .preempt_count =        1,              \
35         .addr_limit =   KERNEL_DS,              \
36         .restart_block =  {                     \
37                 .fn =  do_no_restart_syscall,   \
38         },                                      \
39         .real_thread = NULL,                    \
40 }
41
42 #define init_thread_info        (init_thread_union.thread_info)
43 #define init_stack              (init_thread_union.stack)
44
45 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
46 /* how to get the thread information struct from C */
47 static inline struct thread_info *current_thread_info(void)
48 {
49         struct thread_info *ti;
50         unsigned long mask = THREAD_SIZE - 1;
51         ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
52         return ti;
53 }
54
55 #ifdef CONFIG_DEBUG_STACK_USAGE
56
57 #define alloc_thread_info(tsk) \
58         ((struct thread_info *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, \
59                                                  CONFIG_KERNEL_STACK_ORDER))
60 #else
61
62 /* thread information allocation */
63 #define alloc_thread_info(tsk) \
64         ((struct thread_info *) __get_free_pages(GFP_KERNEL, \
65                                                  CONFIG_KERNEL_STACK_ORDER))
66 #endif
67
68 #define free_thread_info(ti) \
69         free_pages((unsigned long)(ti),CONFIG_KERNEL_STACK_ORDER)
70
71 #endif
72
73 #define PREEMPT_ACTIVE          0x10000000
74
75 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
76 #define TIF_SIGPENDING          1       /* signal pending */
77 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
78 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling 
79                                          * TIF_NEED_RESCHED 
80                                          */
81 #define TIF_RESTART_BLOCK       4
82 #define TIF_MEMDIE              5
83 #define TIF_SYSCALL_AUDIT       6
84 #define TIF_RESTORE_SIGMASK     7
85
86 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
87 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
88 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
89 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
90 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
91 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
92 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
93
94 #endif