um: adjust current_thread_info() for newer gcc versions
[linux-2.6.git] / arch / um / include / asm / thread_info.h
1 /*
2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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/types.h>
12 #include <asm/page.h>
13 #include <asm/uaccess.h>
14
15 struct thread_info {
16         struct task_struct      *task;          /* main task structure */
17         struct exec_domain      *exec_domain;   /* execution domain */
18         unsigned long           flags;          /* low level flags */
19         __u32                   cpu;            /* current CPU */
20         int                     preempt_count;  /* 0 => preemptable,
21                                                    <0 => BUG */
22         mm_segment_t            addr_limit;     /* thread address space:
23                                                    0-0xBFFFFFFF for user
24                                                    0-0xFFFFFFFF for kernel */
25         struct restart_block    restart_block;
26         struct thread_info      *real_thread;    /* Points to non-IRQ stack */
27 };
28
29 #define INIT_THREAD_INFO(tsk)                   \
30 {                                               \
31         .task =         &tsk,                   \
32         .exec_domain =  &default_exec_domain,   \
33         .flags =                0,              \
34         .cpu =          0,                      \
35         .preempt_count = INIT_PREEMPT_COUNT,    \
36         .addr_limit =   KERNEL_DS,              \
37         .restart_block =  {                     \
38                 .fn =  do_no_restart_syscall,   \
39         },                                      \
40         .real_thread = NULL,                    \
41 }
42
43 #define init_thread_info        (init_thread_union.thread_info)
44 #define init_stack              (init_thread_union.stack)
45
46 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
47 /* how to get the thread information struct from C */
48 static inline struct thread_info *current_thread_info(void)
49 {
50         struct thread_info *ti;
51         unsigned long mask = THREAD_SIZE - 1;
52         void *p;
53
54         asm volatile ("" : "=r" (p) : "0" (&ti));
55         ti = (struct thread_info *) (((unsigned long)p) & ~mask);
56         return ti;
57 }
58
59 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
60
61 #endif
62
63 #define PREEMPT_ACTIVE          0x10000000
64
65 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
66 #define TIF_SIGPENDING          1       /* signal pending */
67 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
68 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
69                                          * TIF_NEED_RESCHED */
70 #define TIF_RESTART_BLOCK       4
71 #define TIF_MEMDIE              5       /* is terminating due to OOM killer */
72 #define TIF_SYSCALL_AUDIT       6
73 #define TIF_RESTORE_SIGMASK     7
74 #define TIF_FREEZE              16      /* is freezing for suspend */
75
76 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
77 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
78 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
79 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
80 #define _TIF_MEMDIE             (1 << TIF_MEMDIE)
81 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
82 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
83 #define _TIF_FREEZE             (1 << TIF_FREEZE)
84
85 #endif