晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/sys/user.h
/* Copyright (C) 2001-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _SYS_USER_H
#define _SYS_USER_H	1

/* The whole purpose of this file is for GDB and GDB only.  Don't read
   too much into it.  Don't use it for anything other than GDB unless
   you know what you are doing.  */

#ifdef __x86_64__

struct user_fpregs_struct
{
  unsigned short int	cwd;
  unsigned short int	swd;
  unsigned short int	ftw;
  unsigned short int	fop;
  __extension__ unsigned long long int rip;
  __extension__ unsigned long long int rdp;
  unsigned int		mxcsr;
  unsigned int		mxcr_mask;
  unsigned int		st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
  unsigned int		xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
  unsigned int		padding[24];
};

struct user_regs_struct
{
  __extension__ unsigned long long int r15;
  __extension__ unsigned long long int r14;
  __extension__ unsigned long long int r13;
  __extension__ unsigned long long int r12;
  __extension__ unsigned long long int rbp;
  __extension__ unsigned long long int rbx;
  __extension__ unsigned long long int r11;
  __extension__ unsigned long long int r10;
  __extension__ unsigned long long int r9;
  __extension__ unsigned long long int r8;
  __extension__ unsigned long long int rax;
  __extension__ unsigned long long int rcx;
  __extension__ unsigned long long int rdx;
  __extension__ unsigned long long int rsi;
  __extension__ unsigned long long int rdi;
  __extension__ unsigned long long int orig_rax;
  __extension__ unsigned long long int rip;
  __extension__ unsigned long long int cs;
  __extension__ unsigned long long int eflags;
  __extension__ unsigned long long int rsp;
  __extension__ unsigned long long int ss;
  __extension__ unsigned long long int fs_base;
  __extension__ unsigned long long int gs_base;
  __extension__ unsigned long long int ds;
  __extension__ unsigned long long int es;
  __extension__ unsigned long long int fs;
  __extension__ unsigned long long int gs;
};

struct user
{
  struct user_regs_struct	regs;
  int				u_fpvalid;
  struct user_fpregs_struct	i387;
  __extension__ unsigned long long int	u_tsize;
  __extension__ unsigned long long int	u_dsize;
  __extension__ unsigned long long int	u_ssize;
  __extension__ unsigned long long int	start_code;
  __extension__ unsigned long long int	start_stack;
  __extension__ long long int		signal;
  int				reserved;
  __extension__ union
    {
      struct user_regs_struct*	u_ar0;
      __extension__ unsigned long long int	__u_ar0_word;
    };
  __extension__ union
    {
      struct user_fpregs_struct*	u_fpstate;
      __extension__ unsigned long long int	__u_fpstate_word;
    };
  __extension__ unsigned long long int	magic;
  char				u_comm [32];
  __extension__ unsigned long long int	u_debugreg [8];
};

#else
/* These are the 32-bit x86 structures.  */
struct user_fpregs_struct
{
  long int cwd;
  long int swd;
  long int twd;
  long int fip;
  long int fcs;
  long int foo;
  long int fos;
  long int st_space [20];
};

struct user_fpxregs_struct
{
  unsigned short int cwd;
  unsigned short int swd;
  unsigned short int twd;
  unsigned short int fop;
  long int fip;
  long int fcs;
  long int foo;
  long int fos;
  long int mxcsr;
  long int reserved;
  long int st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
  long int xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
  long int padding[56];
};

struct user_regs_struct
{
  long int ebx;
  long int ecx;
  long int edx;
  long int esi;
  long int edi;
  long int ebp;
  long int eax;
  long int xds;
  long int xes;
  long int xfs;
  long int xgs;
  long int orig_eax;
  long int eip;
  long int xcs;
  long int eflags;
  long int esp;
  long int xss;
};

struct user
{
  struct user_regs_struct	regs;
  int				u_fpvalid;
  struct user_fpregs_struct	i387;
  unsigned long int		u_tsize;
  unsigned long int		u_dsize;
  unsigned long int		u_ssize;
  unsigned long int		start_code;
  unsigned long int		start_stack;
  long int			signal;
  int				reserved;
  struct user_regs_struct*	u_ar0;
  struct user_fpregs_struct*	u_fpstate;
  unsigned long int		magic;
  char				u_comm [32];
  int				u_debugreg [8];
};
#endif  /* __x86_64__ */

#define PAGE_SHIFT		12
#define PAGE_SIZE		(1UL << PAGE_SHIFT)
#define PAGE_MASK		(~(PAGE_SIZE-1))
#define NBPG			PAGE_SIZE
#define UPAGES			1
#define HOST_TEXT_START_ADDR	(u.start_code)
#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)

#endif	/* _SYS_USER_H */

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