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collapseos/apps
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Virgil Dupras 4327153ffd zasm: fix include EOF detection 
That was an interesting bug. It didn't cause a problem in emulation, but
in an RC2014 on an SD card, an include that didn't end with two newlines
would cause an infinite loop.
2019-06-15 15:50:27 -04:00
..
at28w apps/at28w: fix argument byte order 2019-06-14 21:11:45 -04:00
sdct sdc: support 24-bit addressing 2019-06-15 13:41:20 -04:00
zasm zasm: fix include EOF detection 2019-06-15 15:50:27 -04:00
README.md Make userspace parse args the same way the shell does 2019-06-02 14:05:20 -04:00

README.md

User applications

This folder contains code designed to be "userspace" application. Unlike the kernel, which always stay in memory. Those apps here will more likely be loaded in RAM from storage, ran, then discarded so that another userspace program can be run.

That doesn't mean that you can't include that code in your kernel though, but you will typically not want to do that.

Userspace convention

We execute a userspace application by calling the address it's loaded into. This means: a userspace application is expected to return.

Whatever calls the userspace app (usually, it will be the shell), should set HL to a pointer to unparsed arguments in string form, null terminated.

The userspace application is expected to set A on return. 0 means success, non-zero means error.