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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
30struct task_struct;
31
32#include <asm/types.h>
33
34typedef unsigned long mm_segment_t;
35
36struct 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 */
54struct 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 */
89static inline struct thread_info *current_thread_info(void) __attribute_const__;
90
91static 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
110extern void crunch_task_disable(struct thread_info *);
111extern void crunch_task_copy(struct thread_info *, void *);
112extern void crunch_task_restore(struct thread_info *, void *);
113extern void crunch_task_release(struct thread_info *);
114
115extern void iwmmxt_task_disable(struct thread_info *);
116extern void iwmmxt_task_copy(struct thread_info *, void *);
117extern void iwmmxt_task_restore(struct thread_info *, void *);
118extern void iwmmxt_task_release(struct thread_info *);
119extern void iwmmxt_task_switch(struct thread_info *);
120
121extern void vfp_sync_hwstate(struct thread_info *);
122extern void vfp_flush_hwstate(struct thread_info *);
123
124struct user_vfp;
125struct user_vfp_exc;
126
127extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
128 struct user_vfp_exc *);
129extern 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 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
139 */
140#define TIF_SIGPENDING 0 /* signal pending */
141#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
142#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
143#define TIF_UPROBE 3 /* breakpointed or singlestepping */
144#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
145#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
146#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
147#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
148#define TIF_NOTIFY_SIGNAL 8 /* signal notifications exist */
149
150#define TIF_USING_IWMMXT 17
151#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
152#define TIF_RESTORE_SIGMASK 20
153
154#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
155#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
156#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
157#define _TIF_UPROBE (1 << TIF_UPROBE)
158#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
159#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
160#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
161#define _TIF_SECCOMP (1 << TIF_SECCOMP)
162#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
163#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
164
165/* Checks for any syscall work in entry-common.S */
166#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
167 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
168
169/*
170 * Change these and you break ASM code in entry-common.S
171 */
172#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
173 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
174 _TIF_NOTIFY_SIGNAL)
175
176#endif /* __KERNEL__ */
177#endif /* __ASM_ARM_THREAD_INFO_H */