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Linux/arch/sh/include/asm/thread_info.h

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  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         unsigned long           previous_sp;    /* sp of previous stack in case
 37                                                    of nested IRQ stacks */
 38         __u8                    supervisor_stack[0];
 39 };
 40 
 41 #endif
 42 
 43 #if defined(CONFIG_4KSTACKS)
 44 #define THREAD_SHIFT    12
 45 #else
 46 #define THREAD_SHIFT    13
 47 #endif
 48 
 49 #define THREAD_SIZE     (1 << THREAD_SHIFT)
 50 #define STACK_WARN      (THREAD_SIZE >> 3)
 51 
 52 /*
 53  * macros/functions for gaining access to the thread information structure
 54  */
 55 #ifndef __ASSEMBLY__
 56 #define INIT_THREAD_INFO(tsk)                   \
 57 {                                               \
 58         .task           = &tsk,                 \
 59         .exec_domain    = &default_exec_domain, \
 60         .flags          = 0,                    \
 61         .status         = 0,                    \
 62         .cpu            = 0,                    \
 63         .preempt_count  = INIT_PREEMPT_COUNT,   \
 64         .addr_limit     = KERNEL_DS,            \
 65 }
 66 
 67 #define init_thread_info        (init_thread_union.thread_info)
 68 #define init_stack              (init_thread_union.stack)
 69 
 70 /* how to get the current stack pointer from C */
 71 register unsigned long current_stack_pointer asm("r15") __used;
 72 
 73 /* how to get the thread information struct from C */
 74 static inline struct thread_info *current_thread_info(void)
 75 {
 76         struct thread_info *ti;
 77 #if defined(CONFIG_SUPERH64)
 78         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
 79 #elif defined(CONFIG_CPU_HAS_SR_RB)
 80         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
 81 #else
 82         unsigned long __dummy;
 83 
 84         __asm__ __volatile__ (
 85                 "mov    r15, %0\n\t"
 86                 "and    %1, %0\n\t"
 87                 : "=&r" (ti), "=r" (__dummy)
 88                 : "1" (~(THREAD_SIZE - 1))
 89                 : "memory");
 90 #endif
 91 
 92         return ti;
 93 }
 94 
 95 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
 96 
 97 extern void arch_task_cache_init(void);
 98 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 99 extern void arch_release_task_struct(struct task_struct *tsk);
100 extern void init_thread_xstate(void);
101 
102 #endif /* __ASSEMBLY__ */
103 
104 /*
105  * Thread information flags
106  *
107  * - Limited to 24 bits, upper byte used for fault code encoding.
108  *
109  * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
110  *   we blow the tst immediate size constraints and need to fix up
111  *   arch/sh/kernel/entry-common.S.
112  */
113 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
114 #define TIF_SIGPENDING          1       /* signal pending */
115 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
116 #define TIF_SINGLESTEP          4       /* singlestepping active */
117 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
118 #define TIF_SECCOMP             6       /* secure computing */
119 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
120 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
121 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
122 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
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_SINGLESTEP         (1 << TIF_SINGLESTEP)
128 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
129 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
130 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
131 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
132 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
133 
134 /* work to do in syscall trace */
135 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
136                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
137                                  _TIF_SYSCALL_TRACEPOINT)
138 
139 /* work to do on any return to u-space */
140 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
141                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
142                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
143                                  _TIF_SYSCALL_TRACEPOINT)
144 
145 /* work to do on interrupt/exception return */
146 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
147                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
148 
149 /*
150  * Thread-synchronous status.
151  *
152  * This is different from the flags in that nobody else
153  * ever touches our thread-synchronous status, so we don't
154  * have to worry about atomic accesses.
155  */
156 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
157 #define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */
158 
159 #ifndef __ASSEMBLY__
160 
161 #define HAVE_SET_RESTORE_SIGMASK        1
162 static inline void set_restore_sigmask(void)
163 {
164         struct thread_info *ti = current_thread_info();
165         ti->status |= TS_RESTORE_SIGMASK;
166         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
167 }
168 
169 #define TI_FLAG_FAULT_CODE_SHIFT        24
170 
171 /*
172  * Additional thread flag encoding
173  */
174 static inline void set_thread_fault_code(unsigned int val)
175 {
176         struct thread_info *ti = current_thread_info();
177         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
178                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
179 }
180 
181 static inline unsigned int get_thread_fault_code(void)
182 {
183         struct thread_info *ti = current_thread_info();
184         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
185 }
186 
187 static inline void clear_restore_sigmask(void)
188 {
189         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
190 }
191 static inline bool test_restore_sigmask(void)
192 {
193         return current_thread_info()->status & TS_RESTORE_SIGMASK;
194 }
195 static inline bool test_and_clear_restore_sigmask(void)
196 {
197         struct thread_info *ti = current_thread_info();
198         if (!(ti->status & TS_RESTORE_SIGMASK))
199                 return false;
200         ti->status &= ~TS_RESTORE_SIGMASK;
201         return true;
202 }
203 
204 #endif  /* !__ASSEMBLY__ */
205 
206 #endif /* __KERNEL__ */
207 
208 #endif /* __ASM_SH_THREAD_INFO_H */
209 

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