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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#include <asm/page.h>
14
15#ifndef __ASSEMBLY__
16#include <asm/processor.h>
17
18struct 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 status; /* thread synchronous flags */
23 __u32 cpu;
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];
30};
31
32#endif
33
34#define PREEMPT_ACTIVE 0x10000000
35
36#if defined(CONFIG_4KSTACKS)
37#define THREAD_SHIFT 12
38#else
39#define THREAD_SHIFT 13
40#endif
41
42#define THREAD_SIZE (1 << THREAD_SHIFT)
43#define STACK_WARN (THREAD_SIZE >> 3)
44
45/*
46 * macros/functions for gaining access to the thread information structure
47 */
48#ifndef __ASSEMBLY__
49#define INIT_THREAD_INFO(tsk) \
50{ \
51 .task = &tsk, \
52 .exec_domain = &default_exec_domain, \
53 .flags = 0, \
54 .status = 0, \
55 .cpu = 0, \
56 .preempt_count = INIT_PREEMPT_COUNT, \
57 .addr_limit = KERNEL_DS, \
58 .restart_block = { \
59 .fn = do_no_restart_syscall, \
60 }, \
61}
62
63#define init_thread_info (init_thread_union.thread_info)
64#define init_stack (init_thread_union.stack)
65
66/* how to get the current stack pointer from C */
67register unsigned long current_stack_pointer asm("r15") __used;
68
69/* how to get the thread information struct from C */
70static inline struct thread_info *current_thread_info(void)
71{
72 struct thread_info *ti;
73#if defined(CONFIG_SUPERH64)
74 __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
75#elif defined(CONFIG_CPU_HAS_SR_RB)
76 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
77#else
78 unsigned long __dummy;
79
80 __asm__ __volatile__ (
81 "mov r15, %0\n\t"
82 "and %1, %0\n\t"
83 : "=&r" (ti), "=r" (__dummy)
84 : "1" (~(THREAD_SIZE - 1))
85 : "memory");
86#endif
87
88 return ti;
89}
90
91/* thread information allocation */
92#if THREAD_SHIFT >= PAGE_SHIFT
93
94#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
95
96#endif
97
98extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
99extern void free_thread_info(struct thread_info *ti);
100extern void arch_task_cache_init(void);
101#define arch_task_cache_init arch_task_cache_init
102extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
103extern void init_thread_xstate(void);
104
105#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
106
107#endif /* __ASSEMBLY__ */
108
109/*
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
114 */
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_SINGLESTEP 4 /* singlestepping active */
119#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
120#define TIF_SECCOMP 6 /* secure computing */
121#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
122#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
123#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
124#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
125#define TIF_FREEZE 19 /* Freezing for suspend */
126
127#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
128#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
129#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
130#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
131#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
132#define _TIF_SECCOMP (1 << TIF_SECCOMP)
133#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
134#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
135#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
136#define _TIF_FREEZE (1 << TIF_FREEZE)
137
138/*
139 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or we
140 * blow the tst immediate size constraints and need to fix up
141 * arch/sh/kernel/entry-common.S.
142 */
143
144/* work to do in syscall trace */
145#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
146 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
147 _TIF_SYSCALL_TRACEPOINT)
148
149/* work to do on any return to u-space */
150#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
151 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
152 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
153 _TIF_SYSCALL_TRACEPOINT)
154
155/* work to do on interrupt/exception return */
156#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
157 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
158
159/*
160 * Thread-synchronous status.
161 *
162 * This is different from the flags in that nobody else
163 * ever touches our thread-synchronous status, so we don't
164 * have to worry about atomic accesses.
165 */
166#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
167#define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
168
169#ifndef __ASSEMBLY__
170#define HAVE_SET_RESTORE_SIGMASK 1
171static inline void set_restore_sigmask(void)
172{
173 struct thread_info *ti = current_thread_info();
174 ti->status |= TS_RESTORE_SIGMASK;
175 set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
176}
177#endif /* !__ASSEMBLY__ */
178
179#endif /* __KERNEL__ */
180
181#endif /* __ASM_SH_THREAD_INFO_H */