That function—let’s call it the first function—didn’t return to its caller, so execution just went to the next function in the file. The input arguments were whatever happened to be in the a0 and a1 registers. And when that second function returned, it used the caller information that was still available in the ra register, and it returned to where the first function was called from.
图片来源：Hamed Jafarnejad / ISNA / WANA / Reuters
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