汇编伪指令

.bss
.comm       声明未初始化的数据的通用内存区域
.lcomm      声明未初始化的数据的本地通用内存区域
eg .comm synbol ,length

.2byte expression1, expression2, ..., expressionN
Refer to the description of the .value directive.
.4byte expression1, expression2, ..., expressionN
Refer to the description of the .long directive.
.8byte expression1, expression2, ..., expressionN
Refer to the description of the .quad directive.

.string