1 #ifndef __ASM_SH_THREAD_INFO_H
2 #define __ASM_SH_THREAD_INFO_H
5 * Copyright (C) 2002 Niibe Yutaka
7 * The copyright of original i386 version is:
9 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
10 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
16 #include <asm/processor.h>
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 status; /* thread synchronous flags */
24 int preempt_count; /* 0 => preemptable, <0 => BUG */
25 mm_segment_t addr_limit; /* thread address space */
26 struct restart_block restart_block;
27 unsigned long previous_sp; /* sp of previous stack in case
28 of nested IRQ stacks */
29 __u8 supervisor_stack[0];
34 #define PREEMPT_ACTIVE 0x10000000
36 #if defined(CONFIG_4KSTACKS)
37 #define THREAD_SHIFT 12
39 #define THREAD_SHIFT 13
42 #define THREAD_SIZE (1 << THREAD_SHIFT)
43 #define STACK_WARN (THREAD_SIZE >> 3)
46 * macros/functions for gaining access to the thread information structure
49 #define INIT_THREAD_INFO(tsk) \
52 .exec_domain = &default_exec_domain, \
55 .preempt_count = INIT_PREEMPT_COUNT, \
56 .addr_limit = KERNEL_DS, \
58 .fn = do_no_restart_syscall, \
62 #define init_thread_info (init_thread_union.thread_info)
63 #define init_stack (init_thread_union.stack)
65 /* how to get the current stack pointer from C */
66 register unsigned long current_stack_pointer asm("r15") __used;
68 /* how to get the thread information struct from C */
69 static inline struct thread_info *current_thread_info(void)
71 struct thread_info *ti;
72 #if defined(CONFIG_SUPERH64)
73 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
74 #elif defined(CONFIG_CPU_HAS_SR_RB)
75 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
77 unsigned long __dummy;
79 __asm__ __volatile__ (
82 : "=&r" (ti), "=r" (__dummy)
83 : "1" (~(THREAD_SIZE - 1))
90 /* thread information allocation */
91 #if THREAD_SHIFT >= PAGE_SHIFT
93 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
95 #else /* THREAD_SHIFT < PAGE_SHIFT */
97 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
99 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
100 extern void free_thread_info(struct thread_info *ti);
102 #endif /* THREAD_SHIFT < PAGE_SHIFT */
104 #endif /* __ASSEMBLY__ */
107 * thread information flags
108 * - these are process state flags that various assembly files may need to access
109 * - pending work-to-be-done flags are in LSW
110 * - other flags in MSW
112 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
113 #define TIF_SIGPENDING 1 /* signal pending */
114 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
120 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
121 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
122 #define TIF_MEMDIE 18
123 #define TIF_FREEZE 19 /* Freezing for suspend */
125 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
126 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
127 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
133 #define _TIF_USEDFPU (1 << TIF_USEDFPU)
134 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
135 #define _TIF_FREEZE (1 << TIF_FREEZE)
138 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we
139 * blow the tst immediate size constraints and need to fix up
140 * arch/sh/kernel/entry-common.S.
143 /* work to do in syscall trace */
144 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
145 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
146 _TIF_SYSCALL_TRACEPOINT)
148 /* work to do on any return to u-space */
149 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
150 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
151 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
152 _TIF_SYSCALL_TRACEPOINT)
154 /* work to do on interrupt/exception return */
155 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
156 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
159 * Thread-synchronous status.
161 * This is different from the flags in that nobody else
162 * ever touches our thread-synchronous status, so we don't
163 * have to worry about atomic accesses.
165 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
168 #define HAVE_SET_RESTORE_SIGMASK 1
169 static inline void set_restore_sigmask(void)
171 struct thread_info *ti = current_thread_info();
172 ti->status |= TS_RESTORE_SIGMASK;
173 set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
175 #endif /* !__ASSEMBLY__ */
177 #endif /* __KERNEL__ */
179 #endif /* __ASM_SH_THREAD_INFO_H */