arch/sh/include/asm/thread_info.h

   1 #ifndef __ASM_SH_THREAD_INFO_H
   2 #define __ASM_SH_THREAD_INFO_H
   3
   4 /* SuperH version
   5  * Copyright (C) 2002  Niibe Yutaka
   6  *
   7  * The copyright of original i386 version is:
   8  *
   9  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
  10  *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
  11  */
  12 #ifdef __KERNEL__
  13 #include <asm/page.h>
  14
  15 #ifndef __ASSEMBLY__
  16 #include <asm/processor.h>
  17
  18 struct thread_info {
  19         struct task_struct      *task;          /* main task structure */
  20         struct exec_domain      *exec_domain;   /* execution domain */
  21         unsigned long           flags;          /* low level flags */
  22         __u32                   status;         /* thread synchronous flags */
  23         __u32                   cpu;
  24         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  25         mm_segment_t            addr_limit;     /* thread address space */
  26         struct restart_block    restart_block;
  27         unsigned long           previous_sp;    /* sp of previous stack in case
  28                                                    of nested IRQ stacks */
  29         __u8                    supervisor_stack[0];
  30 };
  31
  32 #endif
  33
  34 #define PREEMPT_ACTIVE          0x10000000
  35
  36 #if defined(CONFIG_4KSTACKS)
  37 #define THREAD_SHIFT    12
  38 #else
  39 #define THREAD_SHIFT    13
  40 #endif
  41
  42 #define THREAD_SIZE     (1 << THREAD_SHIFT)
  43 #define STACK_WARN      (THREAD_SIZE >> 3)
  44
  45 /*
  46  * macros/functions for gaining access to the thread information structure
  47  */
  48 #ifndef __ASSEMBLY__
  49 #define INIT_THREAD_INFO(tsk)                   \
  50 {                                               \
  51         .task           = &tsk,                 \
  52         .exec_domain    = &default_exec_domain, \
  53         .flags          = 0,                    \
  54         .status         = 0,                    \
  55         .cpu            = 0,                    \
  56         .preempt_count  = INIT_PREEMPT_COUNT,   \
  57         .addr_limit     = KERNEL_DS,            \
  58         .restart_block  = {                     \
  59                 .fn = do_no_restart_syscall,    \
  60         },                                      \
  61 }
  62
  63 #define init_thread_info        (init_thread_union.thread_info)
  64 #define init_stack              (init_thread_union.stack)
  65
  66 /* how to get the current stack pointer from C */
  67 register unsigned long current_stack_pointer asm("r15") __used;
  68
  69 /* how to get the thread information struct from C */
  70 static inline struct thread_info *current_thread_info(void)
  71 {
  72         struct thread_info *ti;
  73 #if defined(CONFIG_SUPERH64)
  74         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
  75 #elif defined(CONFIG_CPU_HAS_SR_RB)
  76         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  77 #else
  78         unsigned long __dummy;
  79
  80         __asm__ __volatile__ (
  81                 "mov    r15, %0\n\t"
  82                 "and    %1, %0\n\t"
  83                 : "=&r" (ti), "=r" (__dummy)
  84                 : "1" (~(THREAD_SIZE - 1))
  85                 : "memory");
  86 #endif
  87
  88         return ti;
  89 }
  90
  91 /* thread information allocation */
  92 #if THREAD_SHIFT >= PAGE_SHIFT
  93
  94 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  95
  96 #endif
  97
  98 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
  99 extern void free_thread_info(struct thread_info *ti);
 100 extern void arch_task_cache_init(void);
 101 #define arch_task_cache_init arch_task_cache_init
 102 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 103 extern void init_thread_xstate(void);
 104
 105 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
 106
 107 #endif /* __ASSEMBLY__ */
 108
 109 /*
 110  * thread information flags
 111  * - these are process state flags that various assembly files may need to access
 112  * - pending work-to-be-done flags are in LSW
 113  * - other flags in MSW
 114  */
 115 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 116 #define TIF_SIGPENDING          1       /* signal pending */
 117 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 118 #define TIF_SINGLESTEP          4       /* singlestepping active */
 119 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 120 #define TIF_SECCOMP             6       /* secure computing */
 121 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 122 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 123 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 124 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 125 #define TIF_FREEZE              19      /* Freezing for suspend */
 126
 127 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 128 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 129 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 130 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 131 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 132 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 133 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 134 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 135 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 136 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 137
 138 /*
 139  * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we
 140  * blow the tst immediate size constraints and need to fix up
 141  * arch/sh/kernel/entry-common.S.
 142  */
 143
 144 /* work to do in syscall trace */
 145 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 146                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
 147                                  _TIF_SYSCALL_TRACEPOINT)
 148
 149 /* work to do on any return to u-space */
 150 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 151                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 152                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 153                                  _TIF_SYSCALL_TRACEPOINT)
 154
 155 /* work to do on interrupt/exception return */
 156 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 157                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 158
 159 /*
 160  * Thread-synchronous status.
 161  *
 162  * This is different from the flags in that nobody else
 163  * ever touches our thread-synchronous status, so we don't
 164  * have to worry about atomic accesses.
 165  */
 166 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
 167 #define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */
 168
 169 #ifndef __ASSEMBLY__
 170 #define HAVE_SET_RESTORE_SIGMASK        1
 171 static inline void set_restore_sigmask(void)
 172 {
 173         struct thread_info *ti = current_thread_info();
 174         ti->status |= TS_RESTORE_SIGMASK;
 175         set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
 176 }
 177 #endif  /* !__ASSEMBLY__ */
 178
 179 #endif /* __KERNEL__ */
 180
 181 #endif /* __ASM_SH_THREAD_INFO_H */