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