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1da177e4 LT |
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 | */ | |
1da177e4 | 12 | #ifdef __KERNEL__ |
5a1dc78a | 13 | |
a6a31139 | 14 | #include <asm/page.h> |
1da177e4 | 15 | |
5a1dc78a PM |
16 | /* |
17 | * Page fault error code bits | |
18 | */ | |
19 | #define FAULT_CODE_WRITE (1 << 0) /* write access */ | |
20 | #define FAULT_CODE_INITIAL (1 << 1) /* initial page write */ | |
21 | #define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */ | |
22 | #define FAULT_CODE_PROT (1 << 3) /* protection fault */ | |
23 | #define FAULT_CODE_USER (1 << 4) /* user-mode access */ | |
24 | ||
1da177e4 LT |
25 | #ifndef __ASSEMBLY__ |
26 | #include <asm/processor.h> | |
27 | ||
28 | struct thread_info { | |
29 | struct task_struct *task; /* main task structure */ | |
6ecf66ae | 30 | unsigned long flags; /* low level flags */ |
56bfc42f | 31 | __u32 status; /* thread synchronous flags */ |
1da177e4 | 32 | __u32 cpu; |
dcd497f9 | 33 | int preempt_count; /* 0 => preemptable, <0 => BUG */ |
2991be72 | 34 | mm_segment_t addr_limit; /* thread address space */ |
a6a31139 PM |
35 | unsigned long previous_sp; /* sp of previous stack in case |
36 | of nested IRQ stacks */ | |
1da177e4 LT |
37 | __u8 supervisor_stack[0]; |
38 | }; | |
39 | ||
40 | #endif | |
41 | ||
7a847f81 | 42 | #if defined(CONFIG_4KSTACKS) |
c15c5f8c | 43 | #define THREAD_SHIFT 12 |
a6a31139 | 44 | #else |
c15c5f8c | 45 | #define THREAD_SHIFT 13 |
a6a31139 | 46 | #endif |
7a847f81 | 47 | |
c15c5f8c | 48 | #define THREAD_SIZE (1 << THREAD_SHIFT) |
7a847f81 | 49 | #define STACK_WARN (THREAD_SIZE >> 3) |
1da177e4 LT |
50 | |
51 | /* | |
52 | * macros/functions for gaining access to the thread information structure | |
53 | */ | |
54 | #ifndef __ASSEMBLY__ | |
55 | #define INIT_THREAD_INFO(tsk) \ | |
56 | { \ | |
57 | .task = &tsk, \ | |
1da177e4 | 58 | .flags = 0, \ |
d3ea9fa0 | 59 | .status = 0, \ |
1da177e4 | 60 | .cpu = 0, \ |
c99e6efe | 61 | .preempt_count = INIT_PREEMPT_COUNT, \ |
2991be72 | 62 | .addr_limit = KERNEL_DS, \ |
1da177e4 LT |
63 | } |
64 | ||
65 | #define init_thread_info (init_thread_union.thread_info) | |
66 | #define init_stack (init_thread_union.stack) | |
67 | ||
a6a31139 | 68 | /* how to get the current stack pointer from C */ |
3ff6eecc | 69 | register unsigned long current_stack_pointer asm("r15") __used; |
a6a31139 | 70 | |
1da177e4 LT |
71 | /* how to get the thread information struct from C */ |
72 | static inline struct thread_info *current_thread_info(void) | |
73 | { | |
74 | struct thread_info *ti; | |
114f1329 PM |
75 | #if defined(CONFIG_SUPERH64) |
76 | __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); | |
77 | #elif defined(CONFIG_CPU_HAS_SR_RB) | |
78 | __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); | |
f1517494 PM |
79 | #else |
80 | unsigned long __dummy; | |
81 | ||
82 | __asm__ __volatile__ ( | |
83 | "mov r15, %0\n\t" | |
84 | "and %1, %0\n\t" | |
85 | : "=&r" (ti), "=r" (__dummy) | |
86 | : "1" (~(THREAD_SIZE - 1)) | |
87 | : "memory"); | |
88 | #endif | |
89 | ||
1da177e4 LT |
90 | return ti; |
91 | } | |
92 | ||
c15c5f8c PM |
93 | #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
94 | ||
0ea820cf | 95 | extern void arch_task_cache_init(void); |
0ea820cf | 96 | extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); |
df9a7b9b | 97 | extern void arch_release_task_struct(struct task_struct *tsk); |
0ea820cf | 98 | extern void init_thread_xstate(void); |
c652d780 | 99 | |
510c72ad | 100 | #endif /* __ASSEMBLY__ */ |
1da177e4 LT |
101 | |
102 | /* | |
5a1dc78a PM |
103 | * Thread information flags |
104 | * | |
105 | * - Limited to 24 bits, upper byte used for fault code encoding. | |
106 | * | |
107 | * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or | |
108 | * we blow the tst immediate size constraints and need to fix up | |
109 | * arch/sh/kernel/entry-common.S. | |
1da177e4 LT |
110 | */ |
111 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
a583f1b5 SE |
112 | #define TIF_SIGPENDING 1 /* signal pending */ |
113 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ | |
a583f1b5 | 114 | #define TIF_SINGLESTEP 4 /* singlestepping active */ |
c4637d47 PM |
115 | #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ |
116 | #define TIF_SECCOMP 6 /* secure computing */ | |
ab99c733 | 117 | #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ |
a74f7e04 | 118 | #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ |
1da177e4 | 119 | #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
0ddc9324 | 120 | #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
1da177e4 | 121 | |
cec3fd3e PM |
122 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) |
123 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) | |
124 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
cec3fd3e PM |
125 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) |
126 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) | |
c4637d47 | 127 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) |
ab99c733 | 128 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
a74f7e04 | 129 | #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
cec3fd3e | 130 | #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
cec3fd3e | 131 | |
cec3fd3e PM |
132 | /* work to do in syscall trace */ |
133 | #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ | |
c652d780 | 134 | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
a74f7e04 | 135 | _TIF_SYSCALL_TRACEPOINT) |
cec3fd3e PM |
136 | |
137 | /* work to do on any return to u-space */ | |
ab99c733 PM |
138 | #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ |
139 | _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ | |
56bfc42f PM |
140 | _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ |
141 | _TIF_SYSCALL_TRACEPOINT) | |
cec3fd3e PM |
142 | |
143 | /* work to do on interrupt/exception return */ | |
144 | #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ | |
145 | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) | |
1da177e4 | 146 | |
56bfc42f PM |
147 | /* |
148 | * Thread-synchronous status. | |
149 | * | |
150 | * This is different from the flags in that nobody else | |
151 | * ever touches our thread-synchronous status, so we don't | |
152 | * have to worry about atomic accesses. | |
153 | */ | |
d3ea9fa0 | 154 | #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */ |
56bfc42f PM |
155 | |
156 | #ifndef __ASSEMBLY__ | |
5a1dc78a | 157 | |
5a1dc78a PM |
158 | #define TI_FLAG_FAULT_CODE_SHIFT 24 |
159 | ||
160 | /* | |
161 | * Additional thread flag encoding | |
162 | */ | |
163 | static inline void set_thread_fault_code(unsigned int val) | |
164 | { | |
165 | struct thread_info *ti = current_thread_info(); | |
166 | ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT))) | |
167 | | (val << TI_FLAG_FAULT_CODE_SHIFT); | |
168 | } | |
169 | ||
170 | static inline unsigned int get_thread_fault_code(void) | |
171 | { | |
172 | struct thread_info *ti = current_thread_info(); | |
173 | return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT; | |
174 | } | |
4ebefe3e | 175 | |
56bfc42f PM |
176 | #endif /* !__ASSEMBLY__ */ |
177 | ||
1da177e4 LT |
178 | #endif /* __KERNEL__ */ |
179 | ||
180 | #endif /* __ASM_SH_THREAD_INFO_H */ |