Re: [Amforth-devel] icall

[pito <pi...@vo...>]

Hi Michael,
interesting, can you explain in detail? It is understood the icall
is a indirect call addressed by Z. So how to use it actually?
e.g. my_routine (written in .asm)
my_routine:
...
...
ret

So in the amforth I will call it like:

: my_test my_routine icall ;   ?????

P.




----- PŮVODNÍ ZPRÁVA -----
Od: "Kalus Michael" <mic...@on...>
Komu: "amforth mailing list list mailing"
<amf...@li...>
Předmět: [Amforth-devel] icall
Datum: 13.4.2011 - 10:58:45

> Hi.
> Recently someone asked how otherwise imported
> subroutines (c-code)  
> can be used by amforth.
> You may use icall of AVR instruction set to do so.
> Include icall.asm example in your application to
> test it.
> Add more stack to register moves if necessary for
> a given subroutine.
> 
> Michael
> 
> 
> 
> ; ( adr -- )
> ; R( -- )
> ; use icall to execute a code subroutine
> ; operation: PC <-- Z  and push PC+1 to
> returnstack.
> VE_ICALL:
> .dw $ff05
> .db "icall",0
> .dw VE_HEAD
> .set VE_HEAD = VE_ICALL
> XT_ICALL:
> .dw PFA_ICALL
> PFA_ICALL:
> movw zl,tosl
> loadtos
> icall
> jmp DO_NEXT
> 
> ; to test icall make a subroutine:
> subdup:
> savetos
> ret
> subdrop:
> loadtos
> ret
> 
> 
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