对于ARM体系来说，不同语言撰写的函数之间相互调用（mix calls）遵循的是 ATPCS（ARM-Thumb Procedure Call Standard），ATPCS主要是定义了函数呼叫时参数的传递规则以及如何从函数返回，关于ATPCS的详细内容可以查看ADS1.2 Online Books ——Developer Guide的2.1节。这篇文档要讲的是汇编代码中对C函数调用时如何进行参数的传递以及如何从C函数正确返回,ARM system for example, written in different languages between function calls (mix calls) is followed ATPCS (ARM-Thumb Procedure Call Standard), ATPCS main function is to define the parameters of the call transfer rules when and how to return from the function, on the details of ATPCS can view ADS1.2 Online Books- Developer Guide for 2.1. This document is a compilation of the code say on how the C function call parameters and how the transfer function from the right to return to C