[phyrrus9]

Well that was uhhm... long... Nice though, thanks for writing this
I expected it to end at "Hello World", but nope, you dove into file I/O.
I'll get that NSP later today (I hope), and I'll also read part 3.  Time to break out a Raspberry Pi, hell, maybe I'll even write an ARM kernel to learn more about this.
I find it interesting how ARM chose a 3-argument format, you generally see only 2.
I'm considering learning a few assemblies for the hell of it, MIPS, 6502, Z80, whatever else.  Z80 would be an easy one though, I already know 8086...

They actually did some crafty stuff so that using 3-arg instructions and 32-bit fixed width wouldn't prevent you from doing the same things that you can with variable width.

The example here being the very wise use of the barrel shifter, which iirc only ARM has. It allows you to effectively do

Code:

R0 <= R2 + (R1 << 25)

all in one instruction, in one step:

Code:

ADD R0, R2, R1, LSL #25