On macOS, by default, the first 4GB is occupied by the pagezero. While it can be controlled with link time options, as we are an library, we usually don't have a control on how to link an executable.
This folder contains the platform abstract layer for multiple platforms. To support a new platform, you can simply create a new folder here and implement all the APIs defined in include folder.
Refer to port_wamr.md for how to port WAMR to a target platform.