1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_THREAD_INFO_H
3 #define __ASM_SH_THREAD_INFO_H
4
5 /* SuperH version
6 * Copyright (C) 2002 Niibe Yutaka
7 *
8 * The copyright of original i386 version is:
9 *
10 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
11 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
12 */
13 #ifdef __KERNEL__
14
15 #include <asm/page.h>
16
17 /*
18 * Page fault error code bits
19 */
20 #define FAULT_CODE_WRITE (1 << 0) /* write access */
21 #define FAULT_CODE_INITIAL (1 << 1) /* initial page write */
22 #define FAULT_CODE_ITLB (1 << 2) /* ITLB miss */
23 #define FAULT_CODE_PROT (1 << 3) /* protection fault */
24 #define FAULT_CODE_USER (1 << 4) /* user-mode access */
25
26 #ifndef __ASSEMBLY__
27 #include <asm/processor.h>
28
29 struct thread_info {
30 struct task_struct *task; /* main task structure */
31 unsigned long flags; /* low level flags */
32 __u32 status; /* thread synchronous flags */
33 __u32 cpu;
34 int preempt_count; /* 0 => preemptable, <0 => BUG */
35 mm_segment_t addr_limit; /* thread address space */
36 unsigned long previous_sp; /* sp of previous stack in case
37 of nested IRQ stacks */
38 __u8 supervisor_stack[0];
39 };
40
41 #endif
42
43 #if defined(CONFIG_4KSTACKS)
44 #define THREAD_SHIFT 12
45 #else
46 #define THREAD_SHIFT 13
47 #endif
48
49 #define THREAD_SIZE (1 << THREAD_SHIFT)
50 #define STACK_WARN (THREAD_SIZE >> 3)
51
52 /*
53 * macros/functions for gaining access to the thread information structure
54 */
55 #ifndef __ASSEMBLY__
56 #define INIT_THREAD_INFO(tsk) \
57 { \
58 .task = &tsk, \
59 .flags = 0, \
60 .status = 0, \
61 .cpu = 0, \
62 .preempt_count = INIT_PREEMPT_COUNT, \
63 .addr_limit = KERNEL_DS, \
64 }
65
66 /* how to get the current stack pointer from C */
67 register unsigned long current_stack_pointer asm("r15") __used;
68
69 /* how to get the thread information struct from C */
current_thread_info(void)70 static 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 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
92
93 extern void arch_task_cache_init(void);
94 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
95 extern void arch_release_task_struct(struct task_struct *tsk);
96 extern void init_thread_xstate(void);
97
98 #endif /* __ASSEMBLY__ */
99
100 /*
101 * Thread information flags
102 *
103 * - Limited to 24 bits, upper byte used for fault code encoding.
104 *
105 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
106 * we blow the tst immediate size constraints and need to fix up
107 * arch/sh/kernel/entry-common.S.
108 */
109 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
110 #define TIF_SIGPENDING 1 /* signal pending */
111 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
112 #define TIF_SINGLESTEP 4 /* singlestepping active */
113 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
114 #define TIF_SECCOMP 6 /* secure computing */
115 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
116 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
117 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
118 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
119
120 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
121 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
122 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
123 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
124 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
125 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
126 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
127 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
128 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
129
130 /* work to do in syscall trace */
131 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
132 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
133 _TIF_SYSCALL_TRACEPOINT)
134
135 /* work to do on any return to u-space */
136 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
137 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
138 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
139 _TIF_SYSCALL_TRACEPOINT)
140
141 /* work to do on interrupt/exception return */
142 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
143 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
144
145 /*
146 * Thread-synchronous status.
147 *
148 * This is different from the flags in that nobody else
149 * ever touches our thread-synchronous status, so we don't
150 * have to worry about atomic accesses.
151 */
152 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
153
154 #ifndef __ASSEMBLY__
155
156 #define TI_FLAG_FAULT_CODE_SHIFT 24
157
158 /*
159 * Additional thread flag encoding
160 */
set_thread_fault_code(unsigned int val)161 static inline void set_thread_fault_code(unsigned int val)
162 {
163 struct thread_info *ti = current_thread_info();
164 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
165 | (val << TI_FLAG_FAULT_CODE_SHIFT);
166 }
167
get_thread_fault_code(void)168 static inline unsigned int get_thread_fault_code(void)
169 {
170 struct thread_info *ti = current_thread_info();
171 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
172 }
173
174 #endif /* !__ASSEMBLY__ */
175
176 #endif /* __KERNEL__ */
177
178 #endif /* __ASM_SH_THREAD_INFO_H */
179