pedrom::stdout          equ     pedrom@0000+4
pedrom::stderr          equ     pedrom@0000+8
pedrom::argc            equ     pedrom@0000+12
pedrom::argv            equ     pedrom@0000+16
pedrom::errno           equ     pedrom@0000+20
pedrom::side_font       equ     pedrom@0000+24

Is that a future-proof ABI? Doesn't this hardcode the layout of your variables in RAM?