i'm doing a university project in asm using the assembler found in tanenbaum's book "structured computer organization"(ftp here), which produces code to be run on a 8088 emulator (s88)
so, what i wanted to ask is:
say i want to call a subroutine that needs some variables.
the most obvious thing would be to push them on the stack prior to calling the subroutine.
the only problem is that one thing the subroutine needs to do is to print/read them, and in order to do that it has to enqueue them on the stack in a precise order, so what would happen is that i'd have two copies of the same variable on the stack.
PUSH romfile CALL readfile ... readfile: PUSH BP MOV BP,SP PUSH 0 PUSH 6(BP) ! here i'm putting romfile on the stack again PUSH _OPEN SYS
another solution would be to have a register (BX maybe?) point to the variable before calling the subroutine, and then pushing that register into the stack. this way tho, i wouldn't be really calling a subroutine with parameters, right?
what i mean to say, is that imho in this case the signature wouldn't be:
but a simple
is this second approach correct?
i think a drawback in it is that you force people who may be using this subroutine to use a particular register to store the parameters.
thanks, sorry for the mess :)