符号表

符号表是由汇编器构造的，它用过利用 .s 中文件的符号来构造

typedef struct {
    int     name;      /* String table offset */
    char    type:4,    /* Function or data (4 bits) */
            binding:4; /* Local or global (4 bits) */
    char    reserved;  /* Unused */
    short   section;   /* Section header index */
    long    value;     /* Section offset or absolute address */
    long    size;      /* Object size in bytes */
} Elf64_Symbol;