arch/alpha/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ALPHA_THREAD_INFO_H
   3 #define _ALPHA_THREAD_INFO_H
   4
   5 #ifdef __KERNEL__
   6
   7 #ifndef __ASSEMBLY__
   8 #include <asm/processor.h>
   9 #include <asm/types.h>
  10 #include <asm/hwrpb.h>
  11 #include <asm/sysinfo.h>
  12 #endif
  13
  14 #ifndef __ASSEMBLY__
  15 struct thread_info {
  16         struct pcb_struct       pcb;            /* palcode state */
  17
  18         struct task_struct      *task;          /* main task structure */
  19         unsigned int            flags;          /* low level flags */
  20         unsigned int            ieee_state;     /* see fpu.h */
  21
  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         .addr_limit     = KERNEL_DS,            \
  39         .preempt_count  = INIT_PREEMPT_COUNT,   \
  40 }
  41
  42 #define init_thread_info        (init_thread_union.thread_info)
  43 #define init_stack              (init_thread_union.stack)
  44
  45 /* How to get the thread information struct from C.  */
  46 register struct thread_info *__current_thread_info __asm__("$8");
  47 #define current_thread_info()  __current_thread_info
  48
  49 #endif /* __ASSEMBLY__ */
  50
  51 /* Thread information allocation.  */
  52 #define THREAD_SIZE_ORDER 1
  53 #define THREAD_SIZE (2*PAGE_SIZE)
  54
  55 /*
  56  * Thread information flags:
  57  * - these are process state flags and used from assembly
  58  * - pending work-to-be-done flags come first and must be assigned to be
  59  *   within bits 0 to 7 to fit in and immediate operand.
  60  *
  61  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  62  */
  63 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  64 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  65 #define TIF_SIGPENDING          2       /* signal pending */
  66 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  67 #define TIF_SYSCALL_AUDIT       4       /* syscall audit active */
  68 #define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  69 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  70 #define TIF_POLLING_NRFLAG      14      /* idle is polling for TIF_NEED_RESCHED */
  71
  72 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  73 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  74 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  75 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  76 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
  77 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  78
  79 /* Work to do on interrupt/exception return.  */
  80 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  81                                  _TIF_NOTIFY_RESUME)
  82
  83 /* Work to do on any return to userspace.  */
  84 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  85                                  | _TIF_SYSCALL_TRACE)
  86
  87 #define TS_UAC_NOPRINT          0x0001  /* ! Preserve the following three */
  88 #define TS_UAC_NOFIX            0x0002  /* ! flags as they match          */
  89 #define TS_UAC_SIGBUS           0x0004  /* ! userspace part of 'osf_sysinfo' */
  90
  91 #define SET_UNALIGN_CTL(task,value)     ({                              \
  92         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
  93         if (value & PR_UNALIGN_NOPRINT)                                 \
  94                 status |= TS_UAC_NOPRINT;                               \
  95         if (value & PR_UNALIGN_SIGBUS)                                  \
  96                 status |= TS_UAC_SIGBUS;                                \
  97         if (value & 4)  /* alpha-specific */                            \
  98                 status |= TS_UAC_NOFIX;                                 \
  99         task_thread_info(task)->status = status;                        \
 100         0; })
 101
 102 #define GET_UNALIGN_CTL(task,value)     ({                              \
 103         __u32 status = task_thread_info(task)->status & ~UAC_BITMASK;   \
 104         __u32 res = 0;                                                  \
 105         if (status & TS_UAC_NOPRINT)                                    \
 106                 res |= PR_UNALIGN_NOPRINT;                              \
 107         if (status & TS_UAC_SIGBUS)                                     \
 108                 res |= PR_UNALIGN_SIGBUS;                               \
 109         if (status & TS_UAC_NOFIX)                                      \
 110                 res |= 4;                                               \
 111         put_user(res, (int __user *)(value));                           \
 112         })
 113
 114 #endif /* __KERNEL__ */
 115 #endif /* _ALPHA_THREAD_INFO_H */