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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
27struct 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 */
65register unsigned long current_stack_pointer asm("r15") __used;
66
67/* how to get the thread information struct from C */
68static 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
89extern void arch_task_cache_init(void);
90extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
91extern void arch_release_task_struct(struct task_struct *tsk);
92extern 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 */
159static 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
166static 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 */