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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#ifdef CONFIG_VMAP_STACK
29#define THREAD_ALIGN (2 * THREAD_SIZE)
30#else
31#define THREAD_ALIGN THREAD_SIZE
32#endif
33
34#define OVERFLOW_STACK_SIZE SZ_4K
35
36#ifndef __ASSEMBLY__
37
38struct task_struct;
39
40DECLARE_PER_CPU(struct task_struct *, __entry_task);
41
42#include <asm/types.h>
43#include <asm/traps.h>
44
45struct cpu_context_save {
46 __u32 r4;
47 __u32 r5;
48 __u32 r6;
49 __u32 r7;
50 __u32 r8;
51 __u32 r9;
52 __u32 sl;
53 __u32 fp;
54 __u32 sp;
55 __u32 pc;
56 __u32 extra[2]; /* Xscale 'acc' register, etc */
57};
58
59/*
60 * low level task data that entry.S needs immediate access to.
61 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
62 */
63struct thread_info {
64 unsigned long flags; /* low level flags */
65 int preempt_count; /* 0 => preemptable, <0 => bug */
66 __u32 cpu; /* cpu */
67 __u32 cpu_domain; /* cpu domain */
68 struct cpu_context_save cpu_context; /* cpu context */
69 __u32 abi_syscall; /* ABI type and syscall nr */
70 unsigned long tp_value[2]; /* TLS registers */
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 .flags = 0, \
81 .preempt_count = INIT_PREEMPT_COUNT, \
82}
83
84static inline struct task_struct *thread_task(struct thread_info* ti)
85{
86 return (struct task_struct *)ti;
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
102extern void iwmmxt_task_disable(struct thread_info *);
103extern void iwmmxt_task_copy(struct thread_info *, void *);
104extern void iwmmxt_task_restore(struct thread_info *, void *);
105extern void iwmmxt_task_release(struct thread_info *);
106extern void iwmmxt_task_switch(struct thread_info *);
107
108extern int iwmmxt_undef_handler(struct pt_regs *, u32);
109
110static inline void register_iwmmxt_undef_handler(void)
111{
112 static struct undef_hook iwmmxt_undef_hook = {
113 .instr_mask = 0x0c000e00,
114 .instr_val = 0x0c000000,
115 .cpsr_mask = MODE_MASK | PSR_T_BIT,
116 .cpsr_val = USR_MODE,
117 .fn = iwmmxt_undef_handler,
118 };
119
120 register_undef_hook(&iwmmxt_undef_hook);
121}
122
123extern void vfp_sync_hwstate(struct thread_info *);
124extern void vfp_flush_hwstate(struct thread_info *);
125
126struct user_vfp;
127struct user_vfp_exc;
128
129extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
130 struct user_vfp_exc *);
131extern int vfp_restore_user_hwstate(struct user_vfp *,
132 struct user_vfp_exc *);
133#endif
134
135/*
136 * thread information flags:
137 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
138 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
139 *
140 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
141 */
142#define TIF_SIGPENDING 0 /* signal pending */
143#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
144#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
145#define TIF_UPROBE 3 /* breakpointed or singlestepping */
146#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */
147
148#define TIF_USING_IWMMXT 17
149#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
150#define TIF_RESTORE_SIGMASK 19
151#define TIF_SYSCALL_TRACE 20 /* syscall trace active */
152#define TIF_SYSCALL_AUDIT 21 /* syscall auditing active */
153#define TIF_SYSCALL_TRACEPOINT 22 /* syscall tracepoint instrumentation */
154#define TIF_SECCOMP 23 /* seccomp syscall filtering active */
155
156
157#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
158#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
159#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
160#define _TIF_UPROBE (1 << TIF_UPROBE)
161#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
162#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
163#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
164#define _TIF_SECCOMP (1 << TIF_SECCOMP)
165#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
166#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
167
168/* Checks for any syscall work in entry-common.S */
169#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
170 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
171
172/*
173 * Change these and you break ASM code in entry-common.S
174 */
175#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
176 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
177 _TIF_NOTIFY_SIGNAL)
178
179#endif /* __KERNEL__ */
180#endif /* __ASM_ARM_THREAD_INFO_H */