tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
22struct task_struct;
23
24#include <asm/types.h>
25
26typedef unsigned long mm_segment_t;
27
28struct 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 */
46struct 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 current stack pointer in C
80 */
81register unsigned long current_stack_pointer asm ("sp");
82
83/*
84 * how to get the thread information struct from C
85 */
86static inline struct thread_info *current_thread_info(void) __attribute_const__;
87
88static inline struct thread_info *current_thread_info(void)
89{
90 return (struct thread_info *)
91 (current_stack_pointer & ~(THREAD_SIZE - 1));
92}
93
94#define thread_saved_pc(tsk) \
95 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
96#define thread_saved_sp(tsk) \
97 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
98
99#ifndef CONFIG_THUMB2_KERNEL
100#define thread_saved_fp(tsk) \
101 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
102#else
103#define thread_saved_fp(tsk) \
104 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
105#endif
106
107extern void crunch_task_disable(struct thread_info *);
108extern void crunch_task_copy(struct thread_info *, void *);
109extern void crunch_task_restore(struct thread_info *, void *);
110extern void crunch_task_release(struct thread_info *);
111
112extern void iwmmxt_task_disable(struct thread_info *);
113extern void iwmmxt_task_copy(struct thread_info *, void *);
114extern void iwmmxt_task_restore(struct thread_info *, void *);
115extern void iwmmxt_task_release(struct thread_info *);
116extern void iwmmxt_task_switch(struct thread_info *);
117
118extern void vfp_sync_hwstate(struct thread_info *);
119extern void vfp_flush_hwstate(struct thread_info *);
120
121struct user_vfp;
122struct user_vfp_exc;
123
124extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
125 struct user_vfp_exc *);
126extern int vfp_restore_user_hwstate(struct user_vfp *,
127 struct user_vfp_exc *);
128#endif
129
130/*
131 * thread information flags:
132 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
133 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
134 */
135#define TIF_SIGPENDING 0 /* signal pending */
136#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
137#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
138#define TIF_UPROBE 3 /* breakpointed or singlestepping */
139#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
140#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
141#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
142#define TIF_SECCOMP 7 /* seccomp syscall filtering active */
143
144#define TIF_USING_IWMMXT 17
145#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
146#define TIF_RESTORE_SIGMASK 20
147
148#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
149#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
150#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
151#define _TIF_UPROBE (1 << TIF_UPROBE)
152#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
153#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
154#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
155#define _TIF_SECCOMP (1 << TIF_SECCOMP)
156#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
157
158/* Checks for any syscall work in entry-common.S */
159#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
160 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
161
162/*
163 * Change these and you break ASM code in entry-common.S
164 */
165#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
166 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
167
168#endif /* __KERNEL__ */
169#endif /* __ASM_ARM_THREAD_INFO_H */