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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
34struct cpu_context_save {
35 __u32 r4;
36 __u32 r5;
37 __u32 r6;
38 __u32 r7;
39 __u32 r8;
40 __u32 r9;
41 __u32 sl;
42 __u32 fp;
43 __u32 sp;
44 __u32 pc;
45 __u32 extra[2]; /* Xscale 'acc' register, etc */
46};
47
48/*
49 * low level task data that entry.S needs immediate access to.
50 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
51 */
52struct thread_info {
53 unsigned long flags; /* low level flags */
54 int preempt_count; /* 0 => preemptable, <0 => bug */
55 struct task_struct *task; /* main task structure */
56 __u32 cpu; /* cpu */
57 __u32 cpu_domain; /* cpu domain */
58#ifdef CONFIG_STACKPROTECTOR_PER_TASK
59 unsigned long stack_canary;
60#endif
61 struct cpu_context_save cpu_context; /* cpu context */
62 __u32 abi_syscall; /* ABI type and syscall nr */
63 __u8 used_cp[16]; /* thread used copro */
64 unsigned long tp_value[2]; /* TLS registers */
65 union fp_state fpstate __attribute__((aligned(8)));
66 union vfp_state vfpstate;
67#ifdef CONFIG_ARM_THUMBEE
68 unsigned long thumbee_state; /* ThumbEE Handler Base register */
69#endif
70};
71
72#define INIT_THREAD_INFO(tsk) \
73{ \
74 .task = &tsk, \
75 .flags = 0, \
76 .preempt_count = INIT_PREEMPT_COUNT, \
77}
78
79/*
80 * how to get the thread information struct from C
81 */
82static inline struct thread_info *current_thread_info(void) __attribute_const__;
83
84static inline struct thread_info *current_thread_info(void)
85{
86 return (struct thread_info *)
87 (current_stack_pointer & ~(THREAD_SIZE - 1));
88}
89
90#define thread_saved_pc(tsk) \
91 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
92#define thread_saved_sp(tsk) \
93 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
94
95#ifndef CONFIG_THUMB2_KERNEL
96#define thread_saved_fp(tsk) \
97 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
98#else
99#define thread_saved_fp(tsk) \
100 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
101#endif
102
103extern void iwmmxt_task_disable(struct thread_info *);
104extern void iwmmxt_task_copy(struct thread_info *, void *);
105extern void iwmmxt_task_restore(struct thread_info *, void *);
106extern void iwmmxt_task_release(struct thread_info *);
107extern void iwmmxt_task_switch(struct thread_info *);
108
109extern void vfp_sync_hwstate(struct thread_info *);
110extern void vfp_flush_hwstate(struct thread_info *);
111
112struct user_vfp;
113struct user_vfp_exc;
114
115extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
116 struct user_vfp_exc *);
117extern int vfp_restore_user_hwstate(struct user_vfp *,
118 struct user_vfp_exc *);
119#endif
120
121/*
122 * thread information flags:
123 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
124 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
125 *
126 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
127 */
128#define TIF_SIGPENDING 0 /* signal pending */
129#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
130#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
131#define TIF_UPROBE 3 /* breakpointed or singlestepping */
132#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
133#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
134#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
135#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
136#define TIF_NOTIFY_SIGNAL 8 /* signal notifications exist */
137
138#define TIF_USING_IWMMXT 17
139#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
140#define TIF_RESTORE_SIGMASK 20
141
142#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
143#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
144#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
145#define _TIF_UPROBE (1 << TIF_UPROBE)
146#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
147#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
148#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
149#define _TIF_SECCOMP (1 << TIF_SECCOMP)
150#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
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 _TIF_NOTIFY_SIGNAL)
163
164#endif /* __KERNEL__ */
165#endif /* __ASM_ARM_THREAD_INFO_H */