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 */
174