其实用法一样，而且SVC也是同步的。按照Joseph Yiu的说法： " If you have used traditional ARM processors(such as the ARM7),you might know that they have a software interrupt instruction(SWI). The SVC has a similar function, and in fact the binary encoding of SVC instructions is the same as SWI in ARM7. However, since the exception model has changed, this instruction is renamed to make sure that programmers will properly port software code from ARM7 to the Cortex-M3."
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