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union i387_union {
        struct i387_fsave_struct        fsave;ÓɾßÓÐÊýѧЭ´¦ÀíÆ÷¡¢Ò²¿ÉÄÜÓÐmmxµ¥ÔªµÄcpuÄ£ÐÍʹÓá£
        struct i387_fxsave_struct       fxsave;ÓɾßÓÐsee,sse2À©Õ¹¹¦ÄܵÄcpuÄ£ÐÍʹÓá£
        struct i387_soft_struct        soft;ÓÉÎÞÊýѧЭ´¦ÀíÆ÷µÄcpuÄ£ÐÍʹÓã»linuxÄÚºËͨ¹ýÈí¼þÄ£ÄâЭ´¦ÀíÆ÷À´Ö§³ÖÕâЩÀÏʽоƬ¡£
};
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struct i387_fsave_struct {
        long    cwd;
        long    swd;
        long    t


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