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thread_info.h (版本4.16.7:linux-4.16.7archarminclude

2019-07-13 04:42发布

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/* * arch/arm/include/asm/thread_info.h * * Copyright (C) 2002 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __ASM_ARM_THREAD_INFO_H #define __ASM_ARM_THREAD_INFO_H #ifdef __KERNEL__ #include #include #include #define THREAD_SIZE_ORDER 1 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #define THREAD_START_SP (THREAD_SIZE - 8) #ifndef __ASSEMBLY__ struct task_struct; #include typedef unsigned long mm_segment_t; struct cpu_context_save { __u32 r4; __u32 r5; __u32 r6; __u32 r7; __u32 r8; __u32 r9; __u32 sl; __u32 fp; __u32 sp; __u32 pc; __u32 extra[2]; /* Xscale 'acc' register, etc */ }; /* * low level task data that entry.S needs immediate access to. * __switch_to() assumes cpu_context follows immediately after cpu_domain. */ struct thread_info { unsigned long flags; /* low level flags */ int preempt_count; /* 0 => preemptable, <0 => bug */ mm_segment_t addr_limit; /* address limit */ struct task_struct *task; /* main task structure */ __u32 cpu; /* cpu */ __u32 cpu_domain; /* cpu domain */ struct cpu_context_save cpu_context; /* cpu context */ __u32 syscall; /* syscall number */ __u8 used_cp[16]; /* thread used copro */ unsigned long tp_value[2]; /* TLS registers */ #ifdef CONFIG_CRUNCH struct crunch_state crunchstate; #endif union fp_state fpstate __attribute__((aligned(8))); union vfp_state vfpstate; #ifdef CONFIG_ARM_THUMBEE unsigned long thumbee_state; /* ThumbEE Handler Base register */ #endif }; #define INIT_THREAD_INFO(tsk) { .task = &tsk, .flags = 0, .preempt_count = INIT_PREEMPT_COUNT, .addr_limit = KERNEL_DS, } /* * how to get the current stack pointer in C */ register unsigned long current_stack_pointer asm ("sp"); /* * how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) __attribute_const__; static inline struct thread_info *current_thread_info(void) { return (struct thread_info *) (current_stack_pointer & ~(THREAD_SIZE - 1)); } #define thread_saved_pc(tsk) ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) #define thread_saved_sp(tsk) ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) #ifndef CONFIG_THUMB2_KERNEL #define thread_saved_fp(tsk) ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) #else #define thread_saved_fp(tsk) ((unsigned long)(task_thread_info(tsk)->cpu_context.r7)) #endif extern void crunch_task_disable(struct thread_info *); extern void crunch_task_copy(struct thread_info *, void *); extern void crunch_task_restore(struct thread_info *, void *); extern void crunch_task_release(struct thread_info *); extern void iwmmxt_task_disable(struct thread_info *); extern void iwmmxt_task_copy(struct thread_info *, void *); extern void iwmmxt_task_restore(struct thread_info *, void *); extern void iwmmxt_task_release(struct thread_info *); extern void iwmmxt_task_switch(struct thread_info *); extern void vfp_sync_hwstate(struct thread_info *); extern void vfp_flush_hwstate(struct thread_info *); struct user_vfp; struct user_vfp_exc; extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *, struct user_vfp_exc __user *); extern int vfp_restore_user_hwstate(struct user_vfp __user *, struct user_vfp_exc __user *); #endif /* * thread information flags: * TIF_USEDFPU - FPU was used by this task this quantum (SMP) * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_SIGPENDING 0 /* signal pending */ #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ #define TIF_UPROBE 3 /* breakpointed or singlestepping */ #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ #define TIF_SECCOMP 7 /* seccomp syscall filtering active */ #define TIF_NOHZ 12 /* in adaptive nohz mode */ #define TIF_USING_IWMMXT 17 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_RESTORE_SIGMASK 20 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) /* Checks for any syscall work in entry-common.S */ #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP) /* * Change these and you break ASM code in entry-common.S */ #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE) #endif /* __KERNEL__ */ #endif /* __ASM_ARM_THREAD_INFO_H */

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