Apps - Plain directory

why is saving the ‘PC’ – on the stack – frowned upon?

Because what gets stored is either PC+8 or PC+12 on ARM cores seen so far. So the above works… so far.

Doesn’t corrupt R14 :-)

some extra examples instead of ‘bl’:-
bleq routine (may corrupt flags)

adreq r14,ptr   ;can add ‘eq’ ‘ne’ etc
Beq   routine
.ptr
more code
end

.routine
do something
mov pc,r14

That’s just BLEQ in twice as many instructions! What’s more interesting is when you ignore the conventions entirely:

    ADREQ   R7, ret
    BEQ     standards_what_standards
ret ...

standards_what_standards
    ...
    MOV     PC, R7