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 /*
  62  * Thread information flags:
  63  * - these are process state flags and used from assembly
  64  * - pending work-to-be-done flags come first and must be assigned to be
  65  *   within bits 0 to 7 to fit in and immediate operand.
  66  *
  67  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  68  */
  69 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  70 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  71 #define TIF_SIGPENDING          2       /* signal pending */
  72 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  73 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  74 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  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_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  80
  81 /* Work to do on interrupt/exception return.  */
  82 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  83                                  _TIF_NOTIFY_RESUME)
  84
  85 /* Work to do on any return to userspace.  */
  86 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  87                                  | _TIF_SYSCALL_TRACE)
  88
  89 #define TS_UAC_NOPRINT          0x0001  /* ! Preserve the following three */
  90 #define TS_UAC_NOFIX            0x0002  /* ! flags as they match          */
  91 #define TS_UAC_SIGBUS           0x0004  /* ! userspace part of 'osf_sysinfo' */
  92 #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
  93 #define TS_POLLING              0x0010  /* idle task polling need_resched,
  94                                            skip sending interrupt */
  95
  96 #ifndef __ASSEMBLY__
  97 #define HAVE_SET_RESTORE_SIGMASK        1
  98 static inline void set_restore_sigmask(void)
  99 {
 100         struct thread_info *ti = current_thread_info();
 101         ti->status |= TS_RESTORE_SIGMASK;
 102         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
 103 }
 104 static inline void clear_restore_sigmask(void)
 105 {
 106         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 107 }
 108 static inline bool test_restore_sigmask(void)
 109 {
 110         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 111 }
 112 static inline bool test_and_clear_restore_sigmask(void)
 113 {
 114         struct thread_info *ti = current_thread_info();
 115         if (!(ti->status & TS_RESTORE_SIGMASK))
 116                 return false;
 117         ti->status &= ~TS_RESTORE_SIGMASK;
 118         return true;
 119 }
 120 #endif
 121
 122 #define SET_UNALIGN_CTL(task,value)     ({                              \
 123         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 124         if (value & PR_UNALIGN_NOPRINT)                                 \
 125                 status |= TS_UAC_NOPRINT;                               \
 126         if (value & PR_UNALIGN_SIGBUS)                                  \
 127                 status |= TS_UAC_SIGBUS;                                \
 128         if (value & 4)  /* alpha-specific */                            \
 129                 status |= TS_UAC_NOFIX;                                 \
 130         task_thread_info(task)->status = status;                        \
 131         0; })
 132
 133 #define GET_UNALIGN_CTL(task,value)     ({                              \
 134         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 135         __u32 res = 0;                                                  \
 136         if (status & TS_UAC_NOPRINT)                                    \
 137                 res |= PR_UNALIGN_NOPRINT;                              \
 138         if (status & TS_UAC_SIGBUS)                                     \
 139                 res |= PR_UNALIGN_SIGBUS;                               \
 140         if (status & TS_UAC_NOFIX)                                      \
 141                 res |= 4;                                               \
 142         put_user(res, (int __user *)(value));                           \
 143         })
 144
 145 #endif /* __KERNEL__ */
 146 #endif /* _ALPHA_THREAD_INFO_H */