arm上的current

arch/arm/include/asm/current.h
static inline struct task_struct *get_current(void)
{
return current_thread_info()->task;
}

#define current (get_current())

arch/arm/include/asm/thread_info.h
static inline struct thread_info *current_thread_info(void) __attribute_const__;

static inline struct thread_info *current_thread_info(void)
{
register unsigned long sp asm ("sp");
return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
}

struct thread_info 放在当前线程栈底
thread_info可索引到struct task_struct