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 #define THREAD_SIZE_ORDER 1
17 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
18 #define THREAD_START_SP (THREAD_SIZE - 8)
19
20 #ifndef __ASSEMBLY__
21
22 struct task_struct;
23
24 #include <asm/types.h>
25
26 typedef unsigned long mm_segment_t;
27
28 struct cpu_context_save {
29 __u32 r4;
30 __u32 r5;
31 __u32 r6;
32 __u32 r7;
33 __u32 r8;
34 __u32 r9;
35 __u32 sl;
36 __u32 fp;
37 __u32 sp;
38 __u32 pc;
39 __u32 extra[2]; /* Xscale 'acc' register, etc */
40 };
41
42 /*
43 * low level task data that entry.S needs immediate access to.
44 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
45 */
46 struct thread_info {
47 unsigned long flags; /* low level flags */
48 int preempt_count; /* 0 => preemptable, <0 => bug */
49 mm_segment_t addr_limit; /* address limit */
50 struct task_struct *task; /* main task structure */
51 __u32 cpu; /* cpu */
52 __u32 cpu_domain; /* cpu domain */
53 #ifdef CONFIG_STACKPROTECTOR_PER_TASK
54 unsigned long stack_canary;
55 #endif
56 struct cpu_context_save cpu_context; /* cpu context */
57 __u32 syscall; /* syscall number */
58 __u8 used_cp[16]; /* thread used copro */
59 unsigned long tp_value[2]; /* TLS registers */
60 #ifdef CONFIG_CRUNCH
61 struct crunch_state crunchstate;
62 #endif
63 union fp_state fpstate __attribute__((aligned(8)));
64 union vfp_state vfpstate;
65 #ifdef CONFIG_ARM_THUMBEE
66 unsigned long thumbee_state; /* ThumbEE Handler Base register */
67 #endif
68 };
69
70 #define INIT_THREAD_INFO(tsk) \
71 { \
72 .task = &tsk, \
73 .flags = 0, \
74 .preempt_count = INIT_PREEMPT_COUNT, \
75 .addr_limit = KERNEL_DS, \
76 }
77
78 /*
79 * how to get the thread information struct from C
80 */
81 static inline struct thread_info *current_thread_info(void) __attribute_const__;
82
current_thread_info(void)83 static inline struct thread_info *current_thread_info(void)
84 {
85 return (struct thread_info *)
86 (current_stack_pointer & ~(THREAD_SIZE - 1));
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 crunch_task_disable(struct thread_info *);
103 extern void crunch_task_copy(struct thread_info *, void *);
104 extern void crunch_task_restore(struct thread_info *, void *);
105 extern void crunch_task_release(struct thread_info *);
106
107 extern void iwmmxt_task_disable(struct thread_info *);
108 extern void iwmmxt_task_copy(struct thread_info *, void *);
109 extern void iwmmxt_task_restore(struct thread_info *, void *);
110 extern void iwmmxt_task_release(struct thread_info *);
111 extern void iwmmxt_task_switch(struct thread_info *);
112
113 extern void vfp_sync_hwstate(struct thread_info *);
114 extern void vfp_flush_hwstate(struct thread_info *);
115
116 struct user_vfp;
117 struct user_vfp_exc;
118
119 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
120 struct user_vfp_exc *);
121 extern int vfp_restore_user_hwstate(struct user_vfp *,
122 struct user_vfp_exc *);
123 #endif
124
125 /*
126 * thread information flags:
127 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
128 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
129 */
130 #define TIF_SIGPENDING 0 /* signal pending */
131 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
132 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
133 #define TIF_UPROBE 3 /* breakpointed or singlestepping */
134 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
135 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
136 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
137 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
138
139 #define TIF_USING_IWMMXT 17
140 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
141 #define TIF_RESTORE_SIGMASK 20
142
143 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
144 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
145 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
146 #define _TIF_UPROBE (1 << TIF_UPROBE)
147 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
148 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
149 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
150 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
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
163 #endif /* __KERNEL__ */
164 #endif /* __ASM_ARM_THREAD_INFO_H */
165
