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 unsigned long previous_sp; /* sp of previous stack in case
34 of nested IRQ stacks */
35 __u8 supervisor_stack[];
36 };
37
38 #endif
39
40 #if defined(CONFIG_4KSTACKS)
41 #define THREAD_SHIFT 12
42 #else
43 #define THREAD_SHIFT 13
44 #endif
45
46 #define THREAD_SIZE (1 << THREAD_SHIFT)
47 #define STACK_WARN (THREAD_SIZE >> 3)
48
49 /*
50 * macros/functions for gaining access to the thread information structure
51 */
52 #ifndef __ASSEMBLY__
53 #define INIT_THREAD_INFO(tsk) \
54 { \
55 .task = &tsk, \
56 .flags = 0, \
57 .status = 0, \
58 .cpu = 0, \
59 .preempt_count = INIT_PREEMPT_COUNT, \
60 }
61
62 /* how to get the current stack pointer from C */
63 register unsigned long current_stack_pointer asm("r15") __used;
64
65 /* how to get the thread information struct from C */
66 static inline struct thread_info *current_thread_info(void)
67 {
68 struct thread_info *ti;
69 #if defined(CONFIG_CPU_HAS_SR_RB)
70 __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
71 #else
72 unsigned long __dummy;
73
74 __asm__ __volatile__ (
75 "mov r15, %0\n\t"
76 "and %1, %0\n\t"
77 : "=&r" (ti), "=r" (__dummy)
78 : "1" (~(THREAD_SIZE - 1))
79 : "memory");
80 #endif
81
82 return ti;
83 }
84
85 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
86
87 extern void init_thread_xstate(void);
88
89 #endif /* __ASSEMBLY__ */
90
91 /*
92 * Thread information flags
93 *
94 * - Limited to 24 bits, upper byte used for fault code encoding.
95 *
96 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
97 * we blow the tst immediate size constraints and need to fix up
98 * arch/sh/kernel/entry-common.S.
99 */
100 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
101 #define TIF_SIGPENDING 1 /* signal pending */
102 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
103 #define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
104 #define TIF_SINGLESTEP 4 /* singlestepping active */
105 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
106 #define TIF_SECCOMP 6 /* secure computing */
107 #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
108 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
109 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
110 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
111
112 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
113 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
114 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
115 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
116 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
117 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
118 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
119 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
120 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
121 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
122
123 /* work to do in syscall trace */
124 #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
125 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
126 _TIF_SYSCALL_TRACEPOINT)
127
128 /* work to do on any return to u-space */
129 #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \
130 _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \
131 _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \
132 _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL)
133
134 /* work to do on interrupt/exception return */
135 #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
136 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
137
138 /*
139 * Thread-synchronous status.
140 *
141 * This is different from the flags in that nobody else
142 * ever touches our thread-synchronous status, so we don't
143 * have to worry about atomic accesses.
144 */
145 #define TS_USEDFPU 0x0002 /* FPU used by this task this quantum */
146
147 #ifndef __ASSEMBLY__
148
149 #define TI_FLAG_FAULT_CODE_SHIFT 24
150
151 /*
152 * Additional thread flag encoding
153 */
154 static inline void set_thread_fault_code(unsigned int val)
155 {
156 struct thread_info *ti = current_thread_info();
157 ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
158 | (val << TI_FLAG_FAULT_CODE_SHIFT);
159 }
160
161 static inline unsigned int get_thread_fault_code(void)
162 {
163 struct thread_info *ti = current_thread_info();
164 return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
165 }
166
167 #endif /* !__ASSEMBLY__ */
168 #endif /* __ASM_SH_THREAD_INFO_H */
169
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