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
  32 /*
  33  * Macros/functions for gaining access to the thread information structure.
  34  */
  35 #define INIT_THREAD_INFO(tsk)                   \
  36 {                                               \
  37         .task           = &tsk,                 \
  38         .exec_domain    = &default_exec_domain, \
  39         .addr_limit     = KERNEL_DS,            \
  40         .preempt_count  = INIT_PREEMPT_COUNT,   \
  41 }
  42
  43 #define init_thread_info        (init_thread_union.thread_info)
  44 #define init_stack              (init_thread_union.stack)
  45
  46 /* How to get the thread information struct from C.  */
  47 register struct thread_info *__current_thread_info __asm__("$8");
  48 #define current_thread_info()  __current_thread_info
  49
  50 #endif /* __ASSEMBLY__ */
  51
  52 /* Thread information allocation.  */
  53 #define THREAD_SIZE_ORDER 1
  54 #define THREAD_SIZE (2*PAGE_SIZE)
  55
  56 /*
  57  * Thread information flags:
  58  * - these are process state flags and used from assembly
  59  * - pending work-to-be-done flags come first and must be assigned to be
  60  *   within bits 0 to 7 to fit in and immediate operand.
  61  *
  62  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  63  */
  64 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  65 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  66 #define TIF_SIGPENDING          2       /* signal pending */
  67 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  68 #define TIF_SYSCALL_AUDIT       4       /* syscall audit active */
  69 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  70 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  71 #define TIF_POLLING_NRFLAG      14      /* idle is polling for TIF_NEED_RESCHED */
  72
  73 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  74 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  75 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  76 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  77 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
  78 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  79
  80 /* Work to do on interrupt/exception return.  */
  81 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  82                                  _TIF_NOTIFY_RESUME)
  83
  84 /* Work to do on any return to userspace.  */
  85 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  86                                  | _TIF_SYSCALL_TRACE)
  87
  88 #define TS_UAC_NOPRINT          0x0001  /* ! Preserve the following three */
  89 #define TS_UAC_NOFIX            0x0002  /* ! flags as they match          */
  90 #define TS_UAC_SIGBUS           0x0004  /* ! userspace part of 'osf_sysinfo' */
  91 #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
  92
  93 #ifndef __ASSEMBLY__
  94 #define HAVE_SET_RESTORE_SIGMASK        1
  95 static inline void set_restore_sigmask(void)
  96 {
  97         struct thread_info *ti = current_thread_info();
  98         ti->status |= TS_RESTORE_SIGMASK;
  99         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
 100 }
 101 static inline void clear_restore_sigmask(void)
 102 {
 103         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 104 }
 105 static inline bool test_restore_sigmask(void)
 106 {
 107         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 108 }
 109 static inline bool test_and_clear_restore_sigmask(void)
 110 {
 111         struct thread_info *ti = current_thread_info();
 112         if (!(ti->status & TS_RESTORE_SIGMASK))
 113                 return false;
 114         ti->status &= ~TS_RESTORE_SIGMASK;
 115         return true;
 116 }
 117 #endif
 118
 119 #define SET_UNALIGN_CTL(task,value)     ({                              \
 120         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 121         if (value & PR_UNALIGN_NOPRINT)                                 \
 122                 status |= TS_UAC_NOPRINT;                               \
 123         if (value & PR_UNALIGN_SIGBUS)                                  \
 124                 status |= TS_UAC_SIGBUS;                                \
 125         if (value & 4)  /* alpha-specific */                            \
 126                 status |= TS_UAC_NOFIX;                                 \
 127         task_thread_info(task)->status = status;                        \
 128         0; })
 129
 130 #define GET_UNALIGN_CTL(task,value)     ({                              \
 131         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 132         __u32 res = 0;                                                  \
 133         if (status & TS_UAC_NOPRINT)                                    \
 134                 res |= PR_UNALIGN_NOPRINT;                              \
 135         if (status & TS_UAC_SIGBUS)                                     \
 136                 res |= PR_UNALIGN_SIGBUS;                               \
 137         if (status & TS_UAC_NOFIX)                                      \
 138                 res |= 4;                                               \
 139         put_user(res, (int __user *)(value));                           \
 140         })
 141
 142 #endif /* __KERNEL__ */
 143 #endif /* _ALPHA_THREAD_INFO_H */