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 */
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];
33 #define PREEMPT_ACTIVE 0x10000000
35 #if defined(CONFIG_4KSTACKS)
36 #define THREAD_SIZE_ORDER (0)
37 #elif defined(CONFIG_PAGE_SIZE_4KB)
38 #define THREAD_SIZE_ORDER (1)
39 #elif defined(CONFIG_PAGE_SIZE_8KB)
40 #define THREAD_SIZE_ORDER (1)
41 #elif defined(CONFIG_PAGE_SIZE_16KB)
42 #define THREAD_SIZE_ORDER (0)
43 #elif defined(CONFIG_PAGE_SIZE_64KB)
44 #define THREAD_SIZE_ORDER (0)
46 #error "Unknown thread size"
49 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
50 #define STACK_WARN (THREAD_SIZE >> 3)
53 * macros/functions for gaining access to the thread information structure
56 #define INIT_THREAD_INFO(tsk) \
59 .exec_domain = &default_exec_domain, \
63 .addr_limit = KERNEL_DS, \
65 .fn = do_no_restart_syscall, \
69 #define init_thread_info (init_thread_union.thread_info)
70 #define init_stack (init_thread_union.stack)
72 /* how to get the current stack pointer from C */
73 register unsigned long current_stack_pointer asm("r15") __used;
75 /* how to get the thread information struct from C */
76 static inline struct thread_info *current_thread_info(void)
78 struct thread_info *ti;
79 #if defined(CONFIG_SUPERH64)
80 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
81 #elif defined(CONFIG_CPU_HAS_SR_RB)
82 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
84 unsigned long __dummy;
86 __asm__ __volatile__ (
89 : "=&r" (ti), "=r" (__dummy)
90 : "1" (~(THREAD_SIZE - 1))
97 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
99 /* thread information allocation */
100 #ifdef CONFIG_DEBUG_STACK_USAGE
101 #define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
103 #define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
105 #define free_thread_info(ti) kfree(ti)
107 #endif /* __ASSEMBLY__ */
110 * thread information flags
111 * - these are process state flags that various assembly files may need to access
112 * - pending work-to-be-done flags are in LSW
113 * - other flags in MSW
115 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
116 #define TIF_SIGPENDING 1 /* signal pending */
117 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
118 #define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
119 #define TIF_SINGLESTEP 4 /* singlestepping active */
120 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
121 #define TIF_SECCOMP 6 /* secure computing */
122 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
123 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
124 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
125 #define TIF_MEMDIE 18
126 #define TIF_FREEZE 19 /* Freezing for suspend */
128 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
129 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
130 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
131 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
132 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
133 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
134 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
135 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
136 #define _TIF_USEDFPU (1 << TIF_USEDFPU)
137 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
138 #define _TIF_FREEZE (1 << TIF_FREEZE)
141 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
142 * blow the tst immediate size constraints and need to fix up
143 * arch/sh/kernel/entry-common.S.
146 /* work to do in syscall trace */
147 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
148 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
150 /* work to do on any return to u-space */
151 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
152 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
153 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \
156 /* work to do on interrupt/exception return */
157 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
158 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
160 #endif /* __KERNEL__ */
162 #endif /* __ASM_SH_THREAD_INFO_H */