1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  arch/arm/include/asm/thread_info.h
4 *
5 *  Copyright (C) 2002 Russell King.
6 */
7#ifndef __ASM_ARM_THREAD_INFO_H
8#define __ASM_ARM_THREAD_INFO_H
9
10#ifdef __KERNEL__
11
12#include <linux/compiler.h>
13#include <asm/fpstate.h>
14#include <asm/page.h>
15
16#ifdef CONFIG_KASAN
17/*
18 * KASan uses a lot of extra stack space so the thread size order needs to
19 * be increased.
20 */
21#define THREAD_SIZE_ORDER	2
22#else
23#define THREAD_SIZE_ORDER	1
24#endif
25#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
26#define THREAD_START_SP		(THREAD_SIZE - 8)
27
28#ifdef CONFIG_VMAP_STACK
29#define THREAD_ALIGN		(2 * THREAD_SIZE)
30#else
31#define THREAD_ALIGN		THREAD_SIZE
32#endif
33
34#define OVERFLOW_STACK_SIZE	SZ_4K
35
36#ifndef __ASSEMBLY__
37
38struct task_struct;
39
40DECLARE_PER_CPU(struct task_struct *, __entry_task);
41
42#include <asm/types.h>
43#include <asm/traps.h>
44
45struct cpu_context_save {
46	__u32	r4;
47	__u32	r5;
48	__u32	r6;
49	__u32	r7;
50	__u32	r8;
51	__u32	r9;
52	__u32	sl;
53	__u32	fp;
54	__u32	sp;
55	__u32	pc;
56	__u32	extra[2];		/* Xscale 'acc' register, etc */
57};
58
59/*
60 * low level task data that entry.S needs immediate access to.
61 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
62 */
63struct thread_info {
64	unsigned long		flags;		/* low level flags */
65	int			preempt_count;	/* 0 => preemptable, <0 => bug */
66	__u32			cpu;		/* cpu */
67	__u32			cpu_domain;	/* cpu domain */
68	struct cpu_context_save	cpu_context;	/* cpu context */
69	__u32			abi_syscall;	/* ABI type and syscall nr */
70	unsigned long		tp_value[2];	/* TLS registers */
71	union fp_state		fpstate __attribute__((aligned(8)));
72	union vfp_state		vfpstate;
73#ifdef CONFIG_ARM_THUMBEE
74	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
75#endif
76};
77
78#define INIT_THREAD_INFO(tsk)						\
79{									\
80	.flags		= 0,						\
81	.preempt_count	= INIT_PREEMPT_COUNT,				\
82}
83
84static inline struct task_struct *thread_task(struct thread_info* ti)
85{
86	return (struct task_struct *)ti;
87}
88
89#define thread_saved_pc(tsk)	\
90	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
91#define thread_saved_sp(tsk)	\
92	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
93
94#ifndef CONFIG_THUMB2_KERNEL
95#define thread_saved_fp(tsk)	\
96	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
97#else
98#define thread_saved_fp(tsk)	\
99	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
100#endif
101
102extern void iwmmxt_task_disable(struct thread_info *);
103extern void iwmmxt_task_copy(struct thread_info *, void *);
104extern void iwmmxt_task_restore(struct thread_info *, void *);
105extern void iwmmxt_task_release(struct thread_info *);
106extern void iwmmxt_task_switch(struct thread_info *);
107
108extern int iwmmxt_undef_handler(struct pt_regs *, u32);
109
110static inline void register_iwmmxt_undef_handler(void)
111{
112	static struct undef_hook iwmmxt_undef_hook = {
113		.instr_mask	= 0x0c000e00,
114		.instr_val	= 0x0c000000,
115		.cpsr_mask	= MODE_MASK | PSR_T_BIT,
116		.cpsr_val	= USR_MODE,
117		.fn		= iwmmxt_undef_handler,
118	};
119
120	register_undef_hook(&iwmmxt_undef_hook);
121}
122
123extern void vfp_sync_hwstate(struct thread_info *);
124extern void vfp_flush_hwstate(struct thread_info *);
125
126struct user_vfp;
127struct user_vfp_exc;
128
129extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
130					   struct user_vfp_exc *);
131extern int vfp_restore_user_hwstate(struct user_vfp *,
132				    struct user_vfp_exc *);
133#endif
134
135/*
136 * thread information flags:
137 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
138 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
139 *
140 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
141 */
142#define TIF_SIGPENDING		0	/* signal pending */
143#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
144#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
145#define TIF_UPROBE		3	/* breakpointed or singlestepping */
146#define TIF_NOTIFY_SIGNAL	4	/* signal notifications exist */
147
148#define TIF_USING_IWMMXT	17
149#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
150#define TIF_RESTORE_SIGMASK	19
151#define TIF_SYSCALL_TRACE	20	/* syscall trace active */
152#define TIF_SYSCALL_AUDIT	21	/* syscall auditing active */
153#define TIF_SYSCALL_TRACEPOINT	22	/* syscall tracepoint instrumentation */
154#define TIF_SECCOMP		23	/* seccomp syscall filtering active */
155
156
157#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
158#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
159#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
160#define _TIF_UPROBE		(1 << TIF_UPROBE)
161#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
162#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
163#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
164#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
165#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
166#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
167
168/* Checks for any syscall work in entry-common.S */
169#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
170			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
171
172/*
173 * Change these and you break ASM code in entry-common.S
174 */
175#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
176				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
177				 _TIF_NOTIFY_SIGNAL)
178
179#endif /* __KERNEL__ */
180#endif /* __ASM_ARM_THREAD_INFO_H */
181