1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/include/asm/thread_info.h
5 * Copyright (C) 2002 Russell King.
7 #ifndef __ASM_ARM_THREAD_INFO_H
8 #define __ASM_ARM_THREAD_INFO_H
12 #include <linux/compiler.h>
13 #include <asm/fpstate.h>
18 * KASan uses a lot of extra stack space so the thread size order needs to
21 #define THREAD_SIZE_ORDER 2
23 #define THREAD_SIZE_ORDER 1
25 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
26 #define THREAD_START_SP (THREAD_SIZE - 8)
32 #include <asm/types.h>
34 struct cpu_context_save {
45 __u32 extra[2]; /* Xscale 'acc' register, etc */
49 * low level task data that entry.S needs immediate access to.
50 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
53 unsigned long flags; /* low level flags */
54 int preempt_count; /* 0 => preemptable, <0 => bug */
55 int preempt_lazy_count; /* 0 => preemptable, <0 => bug */
56 struct task_struct *task; /* main task structure */
58 __u32 cpu_domain; /* cpu domain */
59 #ifdef CONFIG_STACKPROTECTOR_PER_TASK
60 unsigned long stack_canary;
62 struct cpu_context_save cpu_context; /* cpu context */
63 __u32 abi_syscall; /* ABI type and syscall nr */
64 __u8 used_cp[16]; /* thread used copro */
65 unsigned long tp_value[2]; /* TLS registers */
66 union fp_state fpstate __attribute__((aligned(8)));
67 union vfp_state vfpstate;
68 #ifdef CONFIG_ARM_THUMBEE
69 unsigned long thumbee_state; /* ThumbEE Handler Base register */
73 #define INIT_THREAD_INFO(tsk) \
77 .preempt_count = INIT_PREEMPT_COUNT, \
81 * how to get the thread information struct from C
83 static inline struct thread_info *current_thread_info(void) __attribute_const__;
85 static inline struct thread_info *current_thread_info(void)
87 return (struct thread_info *)
88 (current_stack_pointer & ~(THREAD_SIZE - 1));
91 #define thread_saved_pc(tsk) \
92 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
93 #define thread_saved_sp(tsk) \
94 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
96 #ifndef CONFIG_THUMB2_KERNEL
97 #define thread_saved_fp(tsk) \
98 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
100 #define thread_saved_fp(tsk) \
101 ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
104 extern void iwmmxt_task_disable(struct thread_info *);
105 extern void iwmmxt_task_copy(struct thread_info *, void *);
106 extern void iwmmxt_task_restore(struct thread_info *, void *);
107 extern void iwmmxt_task_release(struct thread_info *);
108 extern void iwmmxt_task_switch(struct thread_info *);
110 extern void vfp_sync_hwstate(struct thread_info *);
111 extern void vfp_flush_hwstate(struct thread_info *);
116 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
117 struct user_vfp_exc *);
118 extern int vfp_restore_user_hwstate(struct user_vfp *,
119 struct user_vfp_exc *);
123 * thread information flags:
124 * TIF_USEDFPU - FPU was used by this task this quantum (SMP)
125 * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
127 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
129 #define TIF_SIGPENDING 0 /* signal pending */
130 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */
131 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
132 #define TIF_UPROBE 3 /* breakpointed or singlestepping */
133 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */
134 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
135 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
136 #define TIF_SECCOMP 7 /* seccomp syscall filtering active */
137 #define TIF_NOTIFY_SIGNAL 8 /* signal notifications exist */
138 #define TIF_NEED_RESCHED_LAZY 9
140 #define TIF_USING_IWMMXT 17
141 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */
142 #define TIF_RESTORE_SIGMASK 20
144 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
145 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
146 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
147 #define _TIF_UPROBE (1 << TIF_UPROBE)
148 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
149 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
150 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
151 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
152 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
153 #define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
154 #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
156 /* Checks for any syscall work in entry-common.S */
157 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
158 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
161 * Change these and you break ASM code in entry-common.S
163 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY | \
165 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
168 #endif /* __KERNEL__ */
169 #endif /* __ASM_ARM_THREAD_INFO_H */