[cc65] Code generation of "jsr enter"

I'm using cc65 to compile some simple C code, and I'm a bit confused as to 
some of the assembly it's generating. 

I see "jsr enter", "jsr pusha", and "jsr leavey" in the generated assembly, 
but I don't see them defined anywhere. This assembles fine though, so I'm not 
sure whats going on or what those subs do. 

Can someone shed some light on this?

Mike Harris
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