ARM64 port of coroutines from Asynchronous Programming in Rust book

The amazing book Asynchronous Programming in Rust by Carl Fredrik Samson has a chapter on implementing stackful coroutines (fibers) in Rust for x86_64 architecture, both Linux and MacOS. But unlike the other chapters, no AArch64 implementation was included for the sake of simplicity. I tried to port it to AArch64, and this post describes my approach. This text is just an additional material for the book. I presume you are familiar either with it or with the original code at ch05/c-fibers. The Asynchronous Programming in Rust by Carl Fredrik Samson has a chapter on implementing coroutines; however, unlike other chapters, it is x64-only.

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