Notice that the only symbol definition that is exported globally is the official procedure descriptor. 注意只有全局导出的符号定义才是正式过程描述符。
This is what the. TOC. @ tocbase reference is for in the official procedure descriptor. 这就是.TOC.@tocbase引用对正式过程描述符的用处所在。
These are called official procedure descriptors, and they contain the information the linker needs to combine position-independent code from different shared object files together. 它们称为正式过程描述符(officialproceduredescriptor),其中包含了链接器将不同共享对象中与位置无关的代码组合在一起所需要的信息。