How to work with variables and constants in ARM assembler?

Question

ARM

Let's say I declared a constant in the .data section:

vara:
.int 3

How can I work with its value? Can it be changed? How to use as an operand? And in general, how to work with variables and constants in ARM assembler?

Answer 1

thinkingeek.com/2013/01/11/arm-assembler-raspberry...
here are the macros for loading the value of a variable into a register and unloading it into a variable:

.macro loadvar r var
    ldr \r, =\var
    ldr \r, [\r]
.endm

.macro storevar r var
    ldr r0, =\var
    str \r, [r0]
.endm