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 #ifndef __ASSEMBLY__
29
30 struct task_struct;
31
32 #include <asm/types.h>
33
34 typedef unsigned long mm_segment_t;
35
36 struct cpu_context_save {
37 __u32 r4;
38 __u32 r5;
39 __u32 r6;
40 __u32 r7;
41 __u32 r8;
42 __u32 r9;
43 __u32 sl;
44 __u32 fp;
45 __u32 sp;
46 __u32 pc;
47 __u32 extra[2]; /* Xscale 'acc' register, etc */
48 };
49
50 /*
51 * low level task data that entry.S needs immediate access to.
52 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
53 */
54 struct thread_info {
55 unsigned long flags; /* low level flags */
56 int preempt_count; /* 0 => preemptable, <0 => bug */
57 mm_segment_t addr_limit; /* address limit */
58 struct task_struct *task; /* main task structure */
59 __u32 cpu; /* cpu */
60 __u32 cpu_domain; /* cpu domain */
61 #ifdef CONFIG_STACKPROTECTOR_PER_TASK
62 unsigned long stack_canary;
63 #endif
64 struct cpu_context_save cpu_context; /* cpu context */
65 __u32 syscall; /* syscall number */
66 __u8 used_cp[16]; /* thread used copro */
67 unsigned long tp_value[2]; /* TLS registers */
68 #ifdef CONFIG_CRUNCH
69 struct crunch_state crunchstate;
70 #endif
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 .task = &tsk, \
81 .flags = 0, \
82 .preempt_count = INIT_PREEMPT_COUNT, \
83 .addr_limit = KERNEL_DS, \
84 }
85
86 /*
87 * how to get the thread information struct from C
88 */
89 static inline struct thread_info *current_thread_info(void) __attribute_const__;
90
current_thread_info(void)91 static inline struct thread_info *current_thread_info(void)
92 {
93 return (struct thread_info *)
94 (current_stack_pointer & ~(THREAD_SIZE - 1));
95 }
96
97 #define thread_saved_pc(tsk) \
98 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
99 #define thread_saved_sp(tsk) \
100 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
101
102 #ifndef CONFIG_THUMB2_KERNEL
103 #define thread_saved_fp(tsk) \
104 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
105 #else
106 #define thread_saved_fp(tsk) \
107 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
108 #endif
109
110 extern void crunch_task_disable(struct thread_info *);
111 extern void crunch_task_copy(struct thread_info *, void *);
112 extern void crunch_task_restore(struct thread_info *, void *);
113 extern void crunch_task_release(struct thread_info *);
114
115 extern void iwmmxt_task_disable(struct thread_info *);
116 extern void iwmmxt_task_copy(struct thread_info *, void *);
117 extern void iwmmxt_task_restore(struct thread_info *, void *);
118 extern void iwmmxt_task_release(struct thread_info *);
119 extern void iwmmxt_task_switch(struct thread_info *);
120
121 extern void vfp_sync_hwstate(struct thread_info *);
122 extern void vfp_flush_hwstate(struct thread_info *);
123
124 struct user_vfp;
125 struct user_vfp_exc;
126
127 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
128 struct user_vfp_exc *);
129 extern int vfp_restore_user_hwstate(struct user_vfp *,
130 struct user_vfp_exc *);
131 #endif
132
133 /*
134 * thread information flags:
135 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
136 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
137 */
138 #define TIF_SIGPENDING 0 /* signal pending */
139 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
140 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
141 #define TIF_UPROBE 3 /* breakpointed or singlestepping */
142 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
143 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
144 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
145 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
146
147 #define TIF_USING_IWMMXT 17
148 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
149 #define TIF_RESTORE_SIGMASK 20
150
151 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
152 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
153 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
154 #define _TIF_UPROBE (1 << TIF_UPROBE)
155 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
156 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
157 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
158 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
159 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
160
161 /* Checks for any syscall work in entry-common.S */
162 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
163 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
164
165 /*
166 * Change these and you break ASM code in entry-common.S
167 */
168 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
169 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
170
171 #endif /* __KERNEL__ */
172 #endif /* __ASM_ARM_THREAD_INFO_H */
173