arch/alpha/include/asm/thread_info.h

   1 #ifndef _ALPHA_THREAD_INFO_H
   2 #define _ALPHA_THREAD_INFO_H
   3
   4 #ifdef __KERNEL__
   5
   6 #ifndef __ASSEMBLY__
   7 #include <asm/processor.h>
   8 #include <asm/types.h>
   9 #include <asm/hwrpb.h>
  10 #include <asm/sysinfo.h>
  11 #endif
  12
  13 #ifndef __ASSEMBLY__
  14 struct thread_info {
  15         struct pcb_struct       pcb;            /* palcode state */
  16
  17         struct task_struct      *task;          /* main task structure */
  18         unsigned int            flags;          /* low level flags */
  19         unsigned int            ieee_state;     /* see fpu.h */
  20
  21         struct exec_domain      *exec_domain;   /* execution domain */
  22         mm_segment_t            addr_limit;     /* thread address space */
  23         unsigned                cpu;            /* current CPU */
  24         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  25         unsigned int            status;         /* thread-synchronous flags */
  26
  27         int bpt_nsaved;
  28         unsigned long bpt_addr[2];              /* breakpoint handling  */
  29         unsigned int bpt_insn[2];
  30
  31         struct restart_block    restart_block;
  32 };
  33
  34 /*
  35  * Macros/functions for gaining access to the thread information structure.
  36  */
  37 #define INIT_THREAD_INFO(tsk)                   \
  38 {                                               \
  39         .task           = &tsk,                 \
  40         .exec_domain    = &default_exec_domain, \
  41         .addr_limit     = KERNEL_DS,            \
  42         .preempt_count  = INIT_PREEMPT_COUNT,   \
  43         .restart_block = {                      \
  44                 .fn = do_no_restart_syscall,    \
  45         },                                      \
  46 }
  47
  48 #define init_thread_info        (init_thread_union.thread_info)
  49 #define init_stack              (init_thread_union.stack)
  50
  51 /* How to get the thread information struct from C.  */
  52 register struct thread_info *__current_thread_info __asm__("$8");
  53 #define current_thread_info()  __current_thread_info
  54
  55 #endif /* __ASSEMBLY__ */
  56
  57 /* Thread information allocation.  */
  58 #define THREAD_SIZE_ORDER 1
  59 #define THREAD_SIZE (2*PAGE_SIZE)
  60
  61 #define PREEMPT_ACTIVE          0x40000000
  62
  63 /*
  64  * Thread information flags:
  65  * - these are process state flags and used from assembly
  66  * - pending work-to-be-done flags come first and must be assigned to be
  67  *   within bits 0 to 7 to fit in and immediate operand.
  68  *
  69  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  70  */
  71 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  72 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  73 #define TIF_SIGPENDING          2       /* signal pending */
  74 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  75 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  76 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  77
  78 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  79 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  80 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  81 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  82
  83 /* Work to do on interrupt/exception return.  */
  84 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  85                                  _TIF_NOTIFY_RESUME)
  86
  87 /* Work to do on any return to userspace.  */
  88 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  89                                  | _TIF_SYSCALL_TRACE)
  90
  91 #define TS_UAC_NOPRINT          0x0001  /* ! Preserve the following three */
  92 #define TS_UAC_NOFIX            0x0002  /* ! flags as they match          */
  93 #define TS_UAC_SIGBUS           0x0004  /* ! userspace part of 'osf_sysinfo' */
  94 #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
  95 #define TS_POLLING              0x0010  /* idle task polling need_resched,
  96                                            skip sending interrupt */
  97
  98 #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
  99
 100 #ifndef __ASSEMBLY__
 101 #define HAVE_SET_RESTORE_SIGMASK        1
 102 static inline void set_restore_sigmask(void)
 103 {
 104         struct thread_info *ti = current_thread_info();
 105         ti->status |= TS_RESTORE_SIGMASK;
 106         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
 107 }
 108 static inline void clear_restore_sigmask(void)
 109 {
 110         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 111 }
 112 static inline bool test_restore_sigmask(void)
 113 {
 114         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 115 }
 116 static inline bool test_and_clear_restore_sigmask(void)
 117 {
 118         struct thread_info *ti = current_thread_info();
 119         if (!(ti->status & TS_RESTORE_SIGMASK))
 120                 return false;
 121         ti->status &= ~TS_RESTORE_SIGMASK;
 122         return true;
 123 }
 124 #endif
 125
 126 #define SET_UNALIGN_CTL(task,value)     ({                              \
 127         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 128         if (value & PR_UNALIGN_NOPRINT)                                 \
 129                 status |= TS_UAC_NOPRINT;                               \
 130         if (value & PR_UNALIGN_SIGBUS)                                  \
 131                 status |= TS_UAC_SIGBUS;                                \
 132         if (value & 4)  /* alpha-specific */                            \
 133                 status |= TS_UAC_NOFIX;                                 \
 134         task_thread_info(task)->status = status;                        \
 135         0; })
 136
 137 #define GET_UNALIGN_CTL(task,value)     ({                              \
 138         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 139         __u32 res = 0;                                                  \
 140         if (status & TS_UAC_NOPRINT)                                    \
 141                 res |= PR_UNALIGN_NOPRINT;                              \
 142         if (status & TS_UAC_SIGBUS)                                     \
 143                 res |= PR_UNALIGN_SIGBUS;                               \
 144         if (status & TS_UAC_NOFIX)                                      \
 145                 res |= 4;                                               \
 146         put_user(res, (int __user *)(value));                           \
 147         })
 148
 149 #endif /* __KERNEL__ */
 150 #endif /* _ALPHA_THREAD_INFO_H */