Lines 1-5 define a set of convenience variables used throughout the rest of the file.

第1 - 5行定义在文件其余部分中使用的快捷变量。

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During the process of creating the convenience variables, the ELF section headers are also validated to ensure that a valid module is being loaded.

在创建方便变量的过程中还会验证el f区段头，确保加载的是有效模块。

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Because the ELF objects are based at offset 0 (until relocation), the convenience variables include the relative offset into the temporary memory block.

因为ELF对象的偏移量是基于0的(除非重新分配)，所以这些方便变量将相对偏移量包含到临时内存块中。

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