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 
38 struct task_struct;
39 
40 DECLARE_PER_CPU(struct task_struct *, __entry_task);
41 
42 #include <asm/types.h>
43 
44 struct cpu_context_save {
45 	__u32	r4;
46 	__u32	r5;
47 	__u32	r6;
48 	__u32	r7;
49 	__u32	r8;
50 	__u32	r9;
51 	__u32	sl;
52 	__u32	fp;
53 	__u32	sp;
54 	__u32	pc;
55 	__u32	extra[2];		/* Xscale 'acc' register, etc */
56 };
57 
58 /*
59  * low level task data that entry.S needs immediate access to.
60  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
61  */
62 struct thread_info {
63 	unsigned long		flags;		/* low level flags */
64 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
65 	__u32			cpu;		/* cpu */
66 	__u32			cpu_domain;	/* cpu domain */
67 	struct cpu_context_save	cpu_context;	/* cpu context */
68 	__u32			abi_syscall;	/* ABI type and syscall nr */
69 	__u8			used_cp[16];	/* thread used copro */
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 
thread_task(struct thread_info * ti)84 static 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 
102 extern void iwmmxt_task_disable(struct thread_info *);
103 extern void iwmmxt_task_copy(struct thread_info *, void *);
104 extern void iwmmxt_task_restore(struct thread_info *, void *);
105 extern void iwmmxt_task_release(struct thread_info *);
106 extern void iwmmxt_task_switch(struct thread_info *);
107 
108 extern void vfp_sync_hwstate(struct thread_info *);
109 extern void vfp_flush_hwstate(struct thread_info *);
110 
111 struct user_vfp;
112 struct user_vfp_exc;
113 
114 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
115 					   struct user_vfp_exc *);
116 extern int vfp_restore_user_hwstate(struct user_vfp *,
117 				    struct user_vfp_exc *);
118 #endif
119 
120 /*
121  * thread information flags:
122  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
123  *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
124  *
125  * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
126  */
127 #define TIF_SIGPENDING		0	/* signal pending */
128 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
129 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
130 #define TIF_UPROBE		3	/* breakpointed or singlestepping */
131 #define TIF_NOTIFY_SIGNAL	4	/* signal notifications exist */
132 
133 #define TIF_USING_IWMMXT	17
134 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
135 #define TIF_RESTORE_SIGMASK	19
136 #define TIF_SYSCALL_TRACE	20	/* syscall trace active */
137 #define TIF_SYSCALL_AUDIT	21	/* syscall auditing active */
138 #define TIF_SYSCALL_TRACEPOINT	22	/* syscall tracepoint instrumentation */
139 #define TIF_SECCOMP		23	/* seccomp syscall filtering active */
140 
141 
142 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
143 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
144 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
145 #define _TIF_UPROBE		(1 << TIF_UPROBE)
146 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
147 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
148 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
149 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
150 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
151 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
152 
153 /* Checks for any syscall work in entry-common.S */
154 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
155 			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
156 
157 /*
158  * Change these and you break ASM code in entry-common.S
159  */
160 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
161 				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
162 				 _TIF_NOTIFY_SIGNAL)
163 
164 #endif /* __KERNEL__ */
165 #endif /* __ASM_ARM_THREAD_INFO_H */
166