arch/sh/include/asm/thread_info.h

   1 #ifndef __ASM_SH_THREAD_INFO_H
   2 #define __ASM_SH_THREAD_INFO_H
   3
   4 /* SuperH version
   5  * Copyright (C) 2002  Niibe Yutaka
   6  *
   7  * The copyright of original i386 version is:
   8  *
   9  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
  10  *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
  11  */
  12 #ifdef __KERNEL__
  13 #include <asm/page.h>
  14
  15 #ifndef __ASSEMBLY__
  16 #include <asm/processor.h>
  17
  18 struct thread_info {
  19         struct task_struct      *task;          /* main task structure */
  20         struct exec_domain      *exec_domain;   /* execution domain */
  21         unsigned long           flags;          /* low level flags */
  22         __u32                   cpu;
  23         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  24         mm_segment_t            addr_limit;     /* thread address space */
  25         struct restart_block    restart_block;
  26         unsigned long           previous_sp;    /* sp of previous stack in case
  27                                                    of nested IRQ stacks */
  28         __u8                    supervisor_stack[0];
  29 };
  30
  31 #endif
  32
  33 #define PREEMPT_ACTIVE          0x10000000
  34
  35 #if defined(CONFIG_4KSTACKS)
  36 #define THREAD_SHIFT    12
  37 #else
  38 #define THREAD_SHIFT    13
  39 #endif
  40
  41 #define THREAD_SIZE     (1 << THREAD_SHIFT)
  42 #define STACK_WARN      (THREAD_SIZE >> 3)
  43
  44 /*
  45  * macros/functions for gaining access to the thread information structure
  46  */
  47 #ifndef __ASSEMBLY__
  48 #define INIT_THREAD_INFO(tsk)                   \
  49 {                                               \
  50         .task           = &tsk,                 \
  51         .exec_domain    = &default_exec_domain, \
  52         .flags          = 0,                    \
  53         .cpu            = 0,                    \
  54         .preempt_count  = 1,                    \
  55         .addr_limit     = KERNEL_DS,            \
  56         .restart_block  = {                     \
  57                 .fn = do_no_restart_syscall,    \
  58         },                                      \
  59 }
  60
  61 #define init_thread_info        (init_thread_union.thread_info)
  62 #define init_stack              (init_thread_union.stack)
  63
  64 /* how to get the current stack pointer from C */
  65 register unsigned long current_stack_pointer asm("r15") __used;
  66
  67 /* how to get the thread information struct from C */
  68 static inline struct thread_info *current_thread_info(void)
  69 {
  70         struct thread_info *ti;
  71 #if defined(CONFIG_SUPERH64)
  72         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
  73 #elif defined(CONFIG_CPU_HAS_SR_RB)
  74         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  75 #else
  76         unsigned long __dummy;
  77
  78         __asm__ __volatile__ (
  79                 "mov    r15, %0\n\t"
  80                 "and    %1, %0\n\t"
  81                 : "=&r" (ti), "=r" (__dummy)
  82                 : "1" (~(THREAD_SIZE - 1))
  83                 : "memory");
  84 #endif
  85
  86         return ti;
  87 }
  88
  89 /* thread information allocation */
  90 #if THREAD_SHIFT >= PAGE_SHIFT
  91
  92 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  93
  94 #else /* THREAD_SHIFT < PAGE_SHIFT */
  95
  96 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  97
  98 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
  99 extern void free_thread_info(struct thread_info *ti);
 100
 101 #endif /* THREAD_SHIFT < PAGE_SHIFT */
 102
 103 #endif /* __ASSEMBLY__ */
 104
 105 /*
 106  * thread information flags
 107  * - these are process state flags that various assembly files may need to access
 108  * - pending work-to-be-done flags are in LSW
 109  * - other flags in MSW
 110  */
 111 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 112 #define TIF_SIGPENDING          1       /* signal pending */
 113 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 114 #define TIF_RESTORE_SIGMASK     3       /* restore signal mask in do_signal() */
 115 #define TIF_SINGLESTEP          4       /* singlestepping active */
 116 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 117 #define TIF_SECCOMP             6       /* secure computing */
 118 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 119 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 120 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 121 #define TIF_MEMDIE              18
 122 #define TIF_FREEZE              19      /* Freezing for suspend */
 123
 124 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 125 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 126 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 127 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 128 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 129 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 130 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 131 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 132 #define _TIF_USEDFPU            (1 << TIF_USEDFPU)
 133 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 134 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 135
 136 /*
 137  * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
 138  * blow the tst immediate size constraints and need to fix up
 139  * arch/sh/kernel/entry-common.S.
 140  */
 141
 142 /* work to do in syscall trace */
 143 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 144                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
 145
 146 /* work to do on any return to u-space */
 147 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 148                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 149                                  _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
 150                                  _TIF_NOTIFY_RESUME)
 151
 152 /* work to do on interrupt/exception return */
 153 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 154                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 155
 156 #endif /* __KERNEL__ */
 157
 158 #endif /* __ASM_SH_THREAD_INFO_H */