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

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  1 /* thread_info.h: Meta low-level thread information
  2  *
  3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
  4  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
  5  *
  6  * Meta port by Imagination Technologies
  7  */
  8 
  9 #ifndef _ASM_THREAD_INFO_H
 10 #define _ASM_THREAD_INFO_H
 11 
 12 #include <linux/compiler.h>
 13 #include <asm/page.h>
 14 
 15 #ifndef __ASSEMBLY__
 16 #include <asm/processor.h>
 17 #endif
 18 
 19 /*
 20  * low level task data that entry.S needs immediate access to
 21  * - this struct should fit entirely inside of one cache line
 22  * - this struct shares the supervisor stack pages
 23  * - if the contents of this structure are changed, the assembly constants must
 24  *   also be changed
 25  */
 26 #ifndef __ASSEMBLY__
 27 
 28 /* This must be 8 byte aligned so we can ensure stack alignment. */
 29 struct thread_info {
 30         struct task_struct *task;       /* main task structure */
 31         unsigned long flags;    /* low level flags */
 32         unsigned long status;   /* thread-synchronous flags */
 33         u32 cpu;                /* current CPU */
 34         int preempt_count;      /* 0 => preemptable, <0 => BUG */
 35 
 36         mm_segment_t addr_limit;        /* thread address space */
 37 
 38         u8 supervisor_stack[0] __aligned(8);
 39 };
 40 
 41 #else /* !__ASSEMBLY__ */
 42 
 43 #include <generated/asm-offsets.h>
 44 
 45 #endif
 46 
 47 #ifdef CONFIG_4KSTACKS
 48 #define THREAD_SHIFT            12
 49 #else
 50 #define THREAD_SHIFT            13
 51 #endif
 52 
 53 #if THREAD_SHIFT >= PAGE_SHIFT
 54 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
 55 #else
 56 #define THREAD_SIZE_ORDER       0
 57 #endif
 58 
 59 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
 60 
 61 #define STACK_WARN              (THREAD_SIZE/8)
 62 /*
 63  * macros/functions for gaining access to the thread information structure
 64  */
 65 #ifndef __ASSEMBLY__
 66 
 67 #define INIT_THREAD_INFO(tsk)                   \
 68 {                                               \
 69         .task           = &tsk,                 \
 70         .flags          = 0,                    \
 71         .cpu            = 0,                    \
 72         .preempt_count  = INIT_PREEMPT_COUNT,   \
 73         .addr_limit     = KERNEL_DS,            \
 74 }
 75 
 76 #define init_thread_info        (init_thread_union.thread_info)
 77 #define init_stack              (init_thread_union.stack)
 78 
 79 /* how to get the current stack pointer from C */
 80 register unsigned long current_stack_pointer asm("A0StP") __used;
 81 
 82 /* how to get the thread information struct from C */
 83 static inline struct thread_info *current_thread_info(void)
 84 {
 85         return (struct thread_info *)(current_stack_pointer &
 86                                       ~(THREAD_SIZE - 1));
 87 }
 88 
 89 #define __HAVE_ARCH_KSTACK_END
 90 static inline int kstack_end(void *addr)
 91 {
 92         return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
 93                                  + sizeof(struct thread_info));
 94 }
 95 
 96 #endif
 97 
 98 /*
 99  * thread information flags
100  * - these are process state flags that various assembly files may need to
101  *   access
102  * - pending work-to-be-done flags are in LSW
103  * - other flags in MSW
104  */
105 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
106 #define TIF_SIGPENDING          1       /* signal pending */
107 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
108 #define TIF_SINGLESTEP          3       /* restore singlestep on return to user
109                                            mode */
110 #define TIF_SYSCALL_AUDIT       4       /* syscall auditing active */
111 #define TIF_SECCOMP             5       /* secure computing */
112 #define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
113 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
114 #define TIF_MEMDIE              8       /* is terminating due to OOM killer */
115 #define TIF_SYSCALL_TRACEPOINT  9       /* syscall tracepoint instrumentation */
116 
117 
118 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
119 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
120 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
121 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
122 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
123 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
124 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
125 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
126 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
127 
128 /* work to do in syscall trace */
129 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
130                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
131                                  _TIF_SYSCALL_TRACEPOINT)
132 
133 /* work to do on any return to u-space */
134 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
135                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
136                                  _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
137                                  _TIF_NOTIFY_RESUME)
138 
139 /* work to do on interrupt/exception return */
140 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
141                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
142 
143 #endif /* _ASM_THREAD_INFO_H */
144 

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