The ARM architecture defines rules for how to call functions, manage the stack, and perform other operations. If part of your code includes ARM assembly instructions, you must adhere to these rules in order for your code to interoperate correctly with compiler-generated code. Similarly, if you write a compiler, the machine instructions you generate must adhere to these rules. If you don’t adhere to them, your code may behave unexpectedly or even crash.

Apple platforms diverge from the standard 64-bit ARM architecture in a few specific ways. Apart from these small differences, iOS, tvOS, and macOS adhere to the rest of the 64-bit ARM specification. For information about the ARM64 specification, including the Procedure Call Standard for the ARM 64-bit Architecture (AArch64), go to https://developer.arm.com.

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