1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Based on arch/arm/include/asm/thread_info.h
4  *
5  * Copyright (C) 2002 Russell King.
6  * Copyright (C) 2012 ARM Ltd.
7  */
8 #ifndef __ASM_THREAD_INFO_H
9 #define __ASM_THREAD_INFO_H
10 
11 #include <linux/compiler.h>
12 
13 #ifndef __ASSEMBLY__
14 
15 struct task_struct;
16 
17 #include <asm/memory.h>
18 #include <asm/stack_pointer.h>
19 #include <asm/types.h>
20 
21 /*
22  * low level task data that entry.S needs immediate access to.
23  */
24 struct thread_info {
25 	unsigned long		flags;		/* low level flags */
26 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
27 	u64			ttbr0;		/* saved TTBR0_EL1 */
28 #endif
29 	union {
30 		u64		preempt_count;	/* 0 => preemptible, <0 => bug */
31 		struct {
32 #ifdef CONFIG_CPU_BIG_ENDIAN
33 			u32	need_resched;
34 			u32	count;
35 #else
36 			u32	count;
37 			u32	need_resched;
38 #endif
39 		} preempt;
40 	};
41 #ifdef CONFIG_SHADOW_CALL_STACK
42 	void			*scs_base;
43 	void			*scs_sp;
44 #endif
45 };
46 
47 #define thread_saved_pc(tsk)	\
48 	((unsigned long)(tsk->thread.cpu_context.pc))
49 #define thread_saved_sp(tsk)	\
50 	((unsigned long)(tsk->thread.cpu_context.sp))
51 #define thread_saved_fp(tsk)	\
52 	((unsigned long)(tsk->thread.cpu_context.fp))
53 
54 void arch_setup_new_exec(void);
55 #define arch_setup_new_exec     arch_setup_new_exec
56 
57 void arch_release_task_struct(struct task_struct *tsk);
58 
59 #endif
60 
61 #define TIF_SIGPENDING		0	/* signal pending */
62 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
63 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
64 #define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
65 #define TIF_UPROBE		4	/* uprobe breakpoint or singlestep */
66 #define TIF_MTE_ASYNC_FAULT	5	/* MTE Asynchronous Tag Check Fault */
67 #define TIF_NOTIFY_SIGNAL	6	/* signal notifications exist */
68 #define TIF_SYSCALL_TRACE	8	/* syscall trace active */
69 #define TIF_SYSCALL_AUDIT	9	/* syscall auditing */
70 #define TIF_SYSCALL_TRACEPOINT	10	/* syscall tracepoint for ftrace */
71 #define TIF_SECCOMP		11	/* syscall secure computing */
72 #define TIF_SYSCALL_EMU		12	/* syscall emulation active */
73 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
74 #define TIF_FREEZE		19
75 #define TIF_RESTORE_SIGMASK	20
76 #define TIF_SINGLESTEP		21
77 #define TIF_32BIT		22	/* 32bit process */
78 #define TIF_SVE			23	/* Scalable Vector Extension in use */
79 #define TIF_SVE_VL_INHERIT	24	/* Inherit sve_vl_onexec across exec */
80 #define TIF_SSBD		25	/* Wants SSB mitigation */
81 #define TIF_TAGGED_ADDR		26	/* Allow tagged user addresses */
82 
83 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
84 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
85 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
86 #define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
87 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
88 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
89 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
90 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
91 #define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
92 #define _TIF_UPROBE		(1 << TIF_UPROBE)
93 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
94 #define _TIF_32BIT		(1 << TIF_32BIT)
95 #define _TIF_SVE		(1 << TIF_SVE)
96 #define _TIF_MTE_ASYNC_FAULT	(1 << TIF_MTE_ASYNC_FAULT)
97 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
98 
99 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
100 				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
101 				 _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
102 				 _TIF_NOTIFY_SIGNAL)
103 
104 #define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
105 				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
106 				 _TIF_SYSCALL_EMU)
107 
108 #ifdef CONFIG_SHADOW_CALL_STACK
109 #define INIT_SCS							\
110 	.scs_base	= init_shadow_call_stack,			\
111 	.scs_sp		= init_shadow_call_stack,
112 #else
113 #define INIT_SCS
114 #endif
115 
116 #define INIT_THREAD_INFO(tsk)						\
117 {									\
118 	.flags		= _TIF_FOREIGN_FPSTATE,				\
119 	.preempt_count	= INIT_PREEMPT_COUNT,				\
120 	INIT_SCS							\
121 }
122 
123 #endif /* __ASM_THREAD_INFO_H */
124