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慢慢欣赏linux 进程创建的时候堆栈的建立long _do_fork(unsigned long clone_flags,	      unsigned long stack_start,	      unsigned long stack_size,	      int __user *parent_tidptr,	      int __user *child_tidptr,	      unsigned long tls){	p = copy_process(clone_flags, stack_start, stack_size,			 child_tidptr, NULL, trace, tls, NUMA_NO_NODE);	=>struct task_struct *copy_process(					unsigned long clone_flags,					unsigned long stack_start,					unsigned long stack_size,					int __user *child_tidptr,					struct pid *pid,					int trace,					unsigned long tls,					int node)	{		p = dup_task_struct(current, node);		=>struct task_struct *dup_task_struct(struct task_struct *orig, int node)		{			struct task_struct *tsk = alloc_task_struct_node(node);			unsigned long *stack = alloc_thread_stack_node(tsk, node);						tsk->stack = stack;			set_task_stack_end_magic(tsk);			=>void set_task_stack_end_magic(struct task_struct *tsk)			{				unsigned long *stackend;				stackend = end_of_stack(tsk);				*stackend = STACK_END_MAGIC;	/* for overflow detection */			}		}	}		retval = copy_thread_tls(clone_flags, stack_start, stack_size, p, tls);	=>int copy_thread_tls(unsigned long clone_flags, unsigned long sp,	unsigned long arg, struct task_struct *p, unsigned long tls)	{		struct pt_regs *childregs = task_pt_regs(p);		=>#define task_pt_regs(task) \		({									\			unsigned long __ptr = (unsigned long)task_stack_page(task);	\			__ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING;		\			((struct pt_regs *)__ptr) - 1;					\		})		=>void *task_stack_page(const struct task_struct *task)		{			return task->stack;		}				struct fork_frame *fork_frame = container_of(childregs, struct fork_frame, regs);		struct inactive_task_frame *frame = &fork_frame->frame;		frame->bp = 0;		frame->ret_addr = (unsigned long) ret_from_fork;		p->thread.sp = (unsigned long) fork_frame;		p->thread.sp0 = (unsigned long) (childregs+1);	}}

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