Just fiddling around with the Whizz BASIC compiler

Because… rainy Sunday, or something. ;-)

Um.

STMFD   R13!,{0,2-11,14}
MOV     R1,#1
LDMFD   R13!,{0,2-11,14}
STMFD   R13!,{0-1,3-11,14}
MOV     R0,#20
ADD     R2,R11,R0
LDMFD   R13!,{0-1,3-11,14}
STMFD   R13!,{0-2,4-11,14}
MOV     R3,#0
LDMFD   R13!,{0-2,4-11,14}
STMFD   R13!,{0-3,5-11,14}
MOV     R4,#0
LDMFD   R13!,{0-3,5-11,14}
STMFD   R13!,{0-4,6-11,14}
MOV     R5,#0
LDMFD   R13!,{0-4,6-11,14}
STMFD   R13!,{0-5,7-11,14}
MOV     R6,#0
LDMFD   R13!,{0-5,7-11,14}
STMFD   R13!,{0-6,8-11,14}
MOV     R7,#0
LDMFD   R13!,{0-6,8-11,14}
STMFD   R13!,{0-7,9-11,14}
MOV     R8,#0
LDMFD   R13!,{0-7,9-11,14}
STMFD   R13!,{0-8,10-11,14}
MOV     R9,#0
LDMFD   R13!,{0-8,10-11,14}
SWI     "Wimp_ReportError"

LDR     R15,[R12,#-4]

I like the way Whizz stashes the exit address in R12. Perhaps because it dumps and retrieves so much stuff from the stack that it doesn’t know what the hell is going on?
Should just call OS_Exit. Luckily FileSwitch does that for us. Actually, that’s all it does on return. ;-)

Not that it matters, but shouldn’t that return be LDR R15,[R12],#4 if it’s being treated as a stack?

Still…. that code….

[note: the only one I’ve found on-line is v0.01; apparently it was developed as far as v0.03 but that doesn’t appear to exist on teh webs]