Initialised data

In NASM, its possible to define pre-initialised data in a file, which gets put in the .data segment:

x db "hello\0"

This is especially useful for defining static strings, and it would be nice to be able to do this in UMC.

A simple syntax would be:

.x: "hello\0"

However this would then be confusing / mixing memory addresses versus instruction addresses.

Instead, we could introduce a memory label:

&x: "hello\0" ; A null terminated string constant

&y: [0x01, 0x02, 0x03] ; Arbitrary bytes

And this could only be used as a memory address constant:

load u8:0, &x