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more/apple_silicon/README.md
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@ -62,6 +62,13 @@ file ends in .S*
## Differences between Apple and Linux ## Differences between Apple and Linux
### Getting the address of `errno`
`errno` is an externally defined `int32_t` used by many "system"
provided APIs to report error conditions back to calling programs. The
macro `ERRNO_ADDR` can be used to converge how Linux and Apple get the
address of the variable (which is left in `x0`).
### Variadic functions ### Variadic functions
*This is important! Understand this section in order to be able to use *This is important! Understand this section in order to be able to use