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
  14 #include <asm/page.h>
  15
  16 /*
  17  * Page fault error code bits
  18  */
  19 #define FAULT_CODE_WRITE        (1 << 0)        /* write access */
  20 #define FAULT_CODE_INITIAL      (1 << 1)        /* initial page write */
  21 #define FAULT_CODE_ITLB         (1 << 2)        /* ITLB miss */
  22 #define FAULT_CODE_PROT         (1 << 3)        /* protection fault */
  23 #define FAULT_CODE_USER         (1 << 4)        /* user-mode access */
  24
  25 #ifndef __ASSEMBLY__
  26 #include <asm/processor.h>
  27
  28 struct thread_info {
  29         struct task_struct      *task;          /* main task structure */
  30         struct exec_domain      *exec_domain;   /* execution domain */
  31         unsigned long           flags;          /* low level flags */
  32         __u32                   status;         /* thread synchronous flags */
  33         __u32                   cpu;
  34         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  35         mm_segment_t            addr_limit;     /* thread address space */
  36         struct restart_block    restart_block;
  37         unsigned long           previous_sp;    /* sp of previous stack in case
  38                                                    of nested IRQ stacks */
  39         __u8                    supervisor_stack[0];
  40 };
  41
  42 #endif
  43
  44 #define PREEMPT_ACTIVE          0x10000000
  45
  46 #if defined(CONFIG_4KSTACKS)
  47 #define THREAD_SHIFT    12
  48 #else
  49 #define THREAD_SHIFT    13
  50 #endif
  51
  52 #define THREAD_SIZE     (1 << THREAD_SHIFT)
  53 #define STACK_WARN      (THREAD_SIZE >> 3)
  54
  55 /*
  56  * macros/functions for gaining access to the thread information structure
  57  */
  58 #ifndef __ASSEMBLY__
  59 #define INIT_THREAD_INFO(tsk)                   \
  60 {                                               \
  61         .task           = &tsk,                 \
  62         .exec_domain    = &default_exec_domain, \
  63         .flags          = 0,                    \
  64         .status         = 0,                    \
  65         .cpu            = 0,                    \
  66         .preempt_count  = INIT_PREEMPT_COUNT,   \
  67         .addr_limit     = KERNEL_DS,            \
  68         .restart_block  = {                     \
  69                 .fn = do_no_restart_syscall,    \
  70         },                                      \
  71 }
  72
  73 #define init_thread_info        (init_thread_union.thread_info)
  74 #define init_stack              (init_thread_union.stack)
  75
  76 /* how to get the current stack pointer from C */
  77 register unsigned long current_stack_pointer asm("r15") __used;
  78
  79 /* how to get the thread information struct from C */
  80 static inline struct thread_info *current_thread_info(void)
  81 {
  82         struct thread_info *ti;
  83 #if defined(CONFIG_SUPERH64)
  84         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
  85 #elif defined(CONFIG_CPU_HAS_SR_RB)
  86         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  87 #else
  88         unsigned long __dummy;
  89
  90         __asm__ __volatile__ (
  91                 "mov    r15, %0\n\t"
  92                 "and    %1, %0\n\t"
  93                 : "=&r" (ti), "=r" (__dummy)
  94                 : "1" (~(THREAD_SIZE - 1))
  95                 : "memory");
  96 #endif
  97
  98         return ti;
  99 }
 100
 101 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
 102
 103 extern void arch_task_cache_init(void);
 104 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 105 extern void arch_release_task_struct(struct task_struct *tsk);
 106 extern void init_thread_xstate(void);
 107
 108 #endif /* __ASSEMBLY__ */
 109
 110 /*
 111  * Thread information flags
 112  *
 113  * - Limited to 24 bits, upper byte used for fault code encoding.
 114  *
 115  * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
 116  *   we blow the tst immediate size constraints and need to fix up
 117  *   arch/sh/kernel/entry-common.S.
 118  */
 119 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 120 #define TIF_SIGPENDING          1       /* signal pending */
 121 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 122 #define TIF_SINGLESTEP          4       /* singlestepping active */
 123 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 124 #define TIF_SECCOMP             6       /* secure computing */
 125 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 126 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 127 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 128 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 129
 130 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 131 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 132 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 133 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 134 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 135 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 136 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 137 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 138 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 139
 140 /* work to do in syscall trace */
 141 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 142                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
 143                                  _TIF_SYSCALL_TRACEPOINT)
 144
 145 /* work to do on any return to u-space */
 146 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 147                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 148                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 149                                  _TIF_SYSCALL_TRACEPOINT)
 150
 151 /* work to do on interrupt/exception return */
 152 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 153                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 154
 155 /*
 156  * Thread-synchronous status.
 157  *
 158  * This is different from the flags in that nobody else
 159  * ever touches our thread-synchronous status, so we don't
 160  * have to worry about atomic accesses.
 161  */
 162 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
 163 #define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */
 164
 165 #ifndef __ASSEMBLY__
 166
 167 #define HAVE_SET_RESTORE_SIGMASK        1
 168 static inline void set_restore_sigmask(void)
 169 {
 170         struct thread_info *ti = current_thread_info();
 171         ti->status |= TS_RESTORE_SIGMASK;
 172         set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
 173 }
 174
 175 #define TI_FLAG_FAULT_CODE_SHIFT        24
 176
 177 /*
 178  * Additional thread flag encoding
 179  */
 180 static inline void set_thread_fault_code(unsigned int val)
 181 {
 182         struct thread_info *ti = current_thread_info();
 183         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 184                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
 185 }
 186
 187 static inline unsigned int get_thread_fault_code(void)
 188 {
 189         struct thread_info *ti = current_thread_info();
 190         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 191 }
 192 #endif  /* !__ASSEMBLY__ */
 193
 194 #endif /* __KERNEL__ */
 195
 196 #endif /* __ASM_SH_THREAD_INFO_H */