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 #include <asm/page.h>
14
15 #ifndef __ASSEMBLY__
16 #include <asm/processor.h>
17
18 struct thread_info {
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 cpu;
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];
29 };
30
31 #endif
32
33 #define PREEMPT_ACTIVE 0x10000000
34
35 #if defined(CONFIG_4KSTACKS)
36 #define THREAD_SHIFT 12
37 #else
38 #define THREAD_SHIFT 13
39 #endif
40
41 #define THREAD_SIZE (1 << THREAD_SHIFT)
42 #define STACK_WARN (THREAD_SIZE >> 3)
43
44 /*
45 * macros/functions for gaining access to the thread information structure
46 */
47 #ifndef __ASSEMBLY__
48 #define INIT_THREAD_INFO(tsk) \
49 { \
50 .task = &tsk, \
51 .exec_domain = &default_exec_domain, \
52 .flags = 0, \
53 .cpu = 0, \
54 .preempt_count = 1, \
55 .addr_limit = KERNEL_DS, \
56 .restart_block = { \
57 .fn = do_no_restart_syscall, \
58 }, \
59 }
60
61 #define init_thread_info (init_thread_union.thread_info)
62 #define init_stack (init_thread_union.stack)
63
64 /* how to get the current stack pointer from C */
65 register unsigned long current_stack_pointer asm("r15") __used;
66
67 /* how to get the thread information struct from C */
current_thread_info(void)68 static inline struct thread_info *current_thread_info(void)
69 {
70 struct thread_info *ti;
71 #if defined(CONFIG_SUPERH64)
72 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
73 #elif defined(CONFIG_CPU_HAS_SR_RB)
74 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
75 #else
76 unsigned long __dummy;
77
78 __asm__ __volatile__ (
79 "mov r15, %0\n\t"
80 "and %1, %0\n\t"
81 : "=&r" (ti), "=r" (__dummy)
82 : "1" (~(THREAD_SIZE - 1))
83 : "memory");
84 #endif
85
86 return ti;
87 }
88
89 /* thread information allocation */
90 #if THREAD_SHIFT >= PAGE_SHIFT
91
92 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
93
94 #else /* THREAD_SHIFT < PAGE_SHIFT */
95
96 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
97
98 extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
99 extern void free_thread_info(struct thread_info *ti);
100
101 #endif /* THREAD_SHIFT < PAGE_SHIFT */
102
103 #endif /* __ASSEMBLY__ */
104
105 /*
106 * thread information flags
107 * - these are process state flags that various assembly files may need to access
108 * - pending work-to-be-done flags are in LSW
109 * - other flags in MSW
110 */
111 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
112 #define TIF_SIGPENDING 1 /* signal pending */
113 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
114 #define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
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_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
120 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
121 #define TIF_MEMDIE 18
122 #define TIF_FREEZE 19 /* Freezing for suspend */
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_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
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_USEDFPU (1 << TIF_USEDFPU)
133 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
134 #define _TIF_FREEZE (1 << TIF_FREEZE)
135
136 /*
137 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
138 * blow the tst immediate size constraints and need to fix up
139 * arch/sh/kernel/entry-common.S.
140 */
141
142 /* work to do in syscall trace */
143 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
144 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
145
146 /* work to do on any return to u-space */
147 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
148 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
149 _TIF_SINGLESTEP | _TIF_RESTORE_SIGMASK | \
150 _TIF_NOTIFY_RESUME)
151
152 /* work to do on interrupt/exception return */
153 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
154 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
155
156 #endif /* __KERNEL__ */
157
158 #endif /* __ASM_SH_THREAD_INFO_H */
159