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         mm_segment_t            addr_limit;     /* thread address space */
  22         unsigned                cpu;            /* current CPU */
  23         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  24         unsigned int            status;         /* thread-synchronous flags */
  25
  26         int bpt_nsaved;
  27         unsigned long bpt_addr[2];              /* breakpoint handling  */
  28         unsigned int bpt_insn[2];
  29 };
  30
  31 /*
  32  * Macros/functions for gaining access to the thread information structure.
  33  */
  34 #define INIT_THREAD_INFO(tsk)                   \
  35 {                                               \
  36         .task           = &tsk,                 \
  37         .addr_limit     = KERNEL_DS,            \
  38         .preempt_count  = INIT_PREEMPT_COUNT,   \
  39 }
  40
  41 #define init_thread_info        (init_thread_union.thread_info)
  42 #define init_stack              (init_thread_union.stack)
  43
  44 /* How to get the thread information struct from C.  */
  45 register struct thread_info *__current_thread_info __asm__("$8");
  46 #define current_thread_info()  __current_thread_info
  47
  48 #endif /* __ASSEMBLY__ */
  49
  50 /* Thread information allocation.  */
  51 #define THREAD_SIZE_ORDER 1
  52 #define THREAD_SIZE (2*PAGE_SIZE)
  53
  54 /*
  55  * Thread information flags:
  56  * - these are process state flags and used from assembly
  57  * - pending work-to-be-done flags come first and must be assigned to be
  58  *   within bits 0 to 7 to fit in and immediate operand.
  59  *
  60  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  61  */
  62 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  63 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  64 #define TIF_SIGPENDING          2       /* signal pending */
  65 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  66 #define TIF_SYSCALL_AUDIT       4       /* syscall audit active */
  67 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  68 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  69 #define TIF_POLLING_NRFLAG      14      /* idle is polling for TIF_NEED_RESCHED */
  70
  71 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  72 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  73 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  74 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  75 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
  76 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  77
  78 /* Work to do on interrupt/exception return.  */
  79 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  80                                  _TIF_NOTIFY_RESUME)
  81
  82 /* Work to do on any return to userspace.  */
  83 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  84                                  | _TIF_SYSCALL_TRACE)
  85
  86 #define TS_UAC_NOPRINT          0x0001  /* ! Preserve the following three */
  87 #define TS_UAC_NOFIX            0x0002  /* ! flags as they match          */
  88 #define TS_UAC_SIGBUS           0x0004  /* ! userspace part of 'osf_sysinfo' */
  89
  90 #define SET_UNALIGN_CTL(task,value)     ({                              \
  91         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
  92         if (value & PR_UNALIGN_NOPRINT)                                 \
  93                 status |= TS_UAC_NOPRINT;                               \
  94         if (value & PR_UNALIGN_SIGBUS)                                  \
  95                 status |= TS_UAC_SIGBUS;                                \
  96         if (value & 4)  /* alpha-specific */                            \
  97                 status |= TS_UAC_NOFIX;                                 \
  98         task_thread_info(task)->status = status;                        \
  99         0; })
 100
 101 #define GET_UNALIGN_CTL(task,value)     ({                              \
 102         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 103         __u32 res = 0;                                                  \
 104         if (status & TS_UAC_NOPRINT)                                    \
 105                 res |= PR_UNALIGN_NOPRINT;                              \
 106         if (status & TS_UAC_SIGBUS)                                     \
 107                 res |= PR_UNALIGN_SIGBUS;                               \
 108         if (status & TS_UAC_NOFIX)                                      \
 109                 res |= 4;                                               \
 110         put_user(res, (int __user *)(value));                           \
 111         })
 112
 113 #endif /* __KERNEL__ */
 114 #endif /* _ALPHA_THREAD_INFO_H */