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 	u32			cpu;
46 };
47 
48 #define thread_saved_pc(tsk)	\
49 	((unsigned long)(tsk->thread.cpu_context.pc))
50 #define thread_saved_sp(tsk)	\
51 	((unsigned long)(tsk->thread.cpu_context.sp))
52 #define thread_saved_fp(tsk)	\
53 	((unsigned long)(tsk->thread.cpu_context.fp))
54 
55 void arch_setup_new_exec(void);
56 #define arch_setup_new_exec     arch_setup_new_exec
57 
58 void arch_release_task_struct(struct task_struct *tsk);
59 int arch_dup_task_struct(struct task_struct *dst,
60 				struct task_struct *src);
61 
62 #endif
63 
64 #define TIF_SIGPENDING		0	/* signal pending */
65 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
66 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
67 #define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
68 #define TIF_UPROBE		4	/* uprobe breakpoint or singlestep */
69 #define TIF_MTE_ASYNC_FAULT	5	/* MTE Asynchronous Tag Check Fault */
70 #define TIF_NOTIFY_SIGNAL	6	/* signal notifications exist */
71 #define TIF_SYSCALL_TRACE	8	/* syscall trace active */
72 #define TIF_SYSCALL_AUDIT	9	/* syscall auditing */
73 #define TIF_SYSCALL_TRACEPOINT	10	/* syscall tracepoint for ftrace */
74 #define TIF_SECCOMP		11	/* syscall secure computing */
75 #define TIF_SYSCALL_EMU		12	/* syscall emulation active */
76 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
77 #define TIF_FREEZE		19
78 #define TIF_RESTORE_SIGMASK	20
79 #define TIF_SINGLESTEP		21
80 #define TIF_32BIT		22	/* 32bit process */
81 #define TIF_SVE			23	/* Scalable Vector Extension in use */
82 #define TIF_SVE_VL_INHERIT	24	/* Inherit SVE vl_onexec across exec */
83 #define TIF_SSBD		25	/* Wants SSB mitigation */
84 #define TIF_TAGGED_ADDR		26	/* Allow tagged user addresses */
85 
86 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
87 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
88 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
89 #define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
90 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
91 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
92 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
93 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
94 #define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
95 #define _TIF_UPROBE		(1 << TIF_UPROBE)
96 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
97 #define _TIF_32BIT		(1 << TIF_32BIT)
98 #define _TIF_SVE		(1 << TIF_SVE)
99 #define _TIF_MTE_ASYNC_FAULT	(1 << TIF_MTE_ASYNC_FAULT)
100 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
101 
102 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
103 				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
104 				 _TIF_UPROBE | _TIF_MTE_ASYNC_FAULT | \
105 				 _TIF_NOTIFY_SIGNAL)
106 
107 #define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
108 				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
109 				 _TIF_SYSCALL_EMU)
110 
111 #ifdef CONFIG_SHADOW_CALL_STACK
112 #define INIT_SCS							\
113 	.scs_base	= init_shadow_call_stack,			\
114 	.scs_sp		= init_shadow_call_stack,
115 #else
116 #define INIT_SCS
117 #endif
118 
119 #define INIT_THREAD_INFO(tsk)						\
120 {									\
121 	.flags		= _TIF_FOREIGN_FPSTATE,				\
122 	.preempt_count	= INIT_PREEMPT_COUNT,				\
123 	INIT_SCS							\
124 }
125 
126 #endif /* __ASM_THREAD_INFO_H */
127