"All i need is an assembly code procedure , that functions as a calculator, for the 8052 microcontroller"

Have you actually tried giving any thought to how you might go about doing this yourself?

In designing a procedure, you should consider:
* What inputs does the procedure need to receive?
* What outputs does the procedure need to return?
* What steps does the procedure need to perform to produce the required outputs from the supplied inputs?

Rather than dive straight in with assembler, you'll probably find it easier to start at a "higher", more abstract, level - considering what needs to be done, rather than worrying about the details of how to achieve it in 8051 assembler.
You could try using some sort of structured natural language, or "pseudo code", or drawing flowcharts or diagrams - whatever you find most helpful.

OK, now it's your turn - give it a try!