Return multiple values: Difference between revisions

When programming without any rules governing the way you write functions, a function's "return value" is nothing more than the register state upon exit. However, the [https://www.eecs.umich.edu/courses/eecs373/readings/ARM-AAPCS-EABI-v2.08.pdf AAPCS] calling convention dictates that the <code>R0</code> register is used to store a function's return value. (If the return value is larger than 32 bits, the registers <code>R1-R3</code> can also be used.) Following this standard is necessary for human-written assembly code to properly interface with code written by a C compiler.

 

 

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