arch/h8300/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* thread_info.h: h8300 low-level thread information
   3  * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp>
   4  *
   5  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   6  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   7  */
   8
   9 #ifndef _ASM_THREAD_INFO_H
  10 #define _ASM_THREAD_INFO_H
  11
  12 #include <asm/page.h>
  13 #include <asm/segment.h>
  14
  15 #ifdef __KERNEL__
  16
  17 /*
  18  * Size of kernel stack for each process. This must be a power of 2...
  19  */
  20 #define THREAD_SIZE_ORDER       1
  21 #define THREAD_SIZE             8192    /* 2 pages */
  22
  23 #ifndef __ASSEMBLY__
  24
  25 /*
  26  * low level task data.
  27  * If you change this, change the TI_* offsets below to match.
  28  */
  29 struct thread_info {
  30         struct task_struct *task;               /* main task structure */
  31         unsigned long      flags;               /* low level flags */
  32         int                cpu;                 /* cpu we're on */
  33         int                preempt_count;       /* 0 => preemptable, <0 => BUG */
  34         mm_segment_t            addr_limit;
  35 };
  36
  37 /*
  38  * macros/functions for gaining access to the thread information structure
  39  */
  40 #define INIT_THREAD_INFO(tsk)                   \
  41 {                                               \
  42         .task =         &tsk,                   \
  43         .flags =        0,                      \
  44         .cpu =          0,                      \
  45         .preempt_count = INIT_PREEMPT_COUNT,    \
  46         .addr_limit     = KERNEL_DS,            \
  47 }
  48
  49 /* how to get the thread information struct from C */
  50 static inline struct thread_info *current_thread_info(void)
  51 {
  52         struct thread_info *ti;
  53
  54         __asm__("mov.l  sp, %0\n\t"
  55                 "and.w  %1, %T0"
  56                 : "=&r"(ti)
  57                 : "i" (~(THREAD_SIZE-1) & 0xffff));
  58         return ti;
  59 }
  60
  61 #endif /* __ASSEMBLY__ */
  62
  63 /*
  64  * thread information flag bit numbers
  65  */
  66 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  67 #define TIF_SIGPENDING          1       /* signal pending */
  68 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  69 #define TIF_SINGLESTEP          3       /* singlestepping active */
  70 #define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  71 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  72 #define TIF_NOTIFY_RESUME       6       /* callback before returning to user */
  73 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
  74 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
  75 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling TIF_NEED_RESCHED */
  76
  77 /* as above, but as bit values */
  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 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
  83 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  84 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
  85 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  86
  87 /* work to do in syscall trace */
  88 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
  89                                  _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
  90
  91 /* work to do on any return to u-space */
  92 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
  93                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
  94                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
  95                                  _TIF_SYSCALL_TRACEPOINT)
  96
  97 /* work to do on interrupt/exception return */
  98 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
  99                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 100
 101 #endif /* __KERNEL__ */
 102
 103 #endif /* _ASM_THREAD_INFO_H */