lib/arch/x86_64/README.md


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# SystemV AMD64 ABI

- Integer/pointer arguments via `rdi`, `rsi`, `rdx`, `rcx`, `r8`, `r9`
- Integer/pointer return values via `rax`
- Callee saved registers `rbx`, `rbp`, `r12` – `r15`

## Reference
- [johannst x86_64 notes](https://johannst.github.io/notes/arch/x86_64.html)