[cc65] calling an asm .proc from C with arguments

I'm re-writing my library in asm, but still want to link it from C code.
So I would like to know how to access the arguments from within the asm 
.proc

I think this may be target-specific, as in nes.cfg says:
"# $0500-$0800 3 pages for cc65 parameter stack"

I've seen from generated asm code, that cc65 uses some routines such as 
"pushax", but I don't yet totaly understand it.
any help would be appreciated.
Thanks!

PS: For the time being, I'm using zero page vars for this, which works 
fine, and (I think) is faster than a stack, but of course rules out 
recursivity, functions calling each other, and functions being 
interrupted with code that uses the same zp vars.
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