vvm/examples/example.vvmc at master · averrin/vvm · GitHub

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PROLOGUE:
MOV EDI ESP                     ;only what i know — device table before stack
MOV EAX EDI
SUB EAX 0x80
SUB EAX 0x14                    ; we are at device table start
INC EAX                         ; first device is std lib so we just go to its address
MOV EAX [EAX]
PUSH EAX                        ; save GET_DEVICE_ADDR

INIT:
MOV ECX 0x12                    ; 0x12 -- video device id
CALL [EAX]                      ; get VIDEO address into ECX
POP EAX                         ; restore GET_DEVICE_ADDR
PUSH ECX                        ; save VIDEO address

PUSH 0x01                       ; pixel counter
JMP DRAW

RESET:
;; POP EBX
;; MOV EBX 0x01
;; PUSH EBX

DRAW:
MOV EBX 0x00
PUSH EAX
ADD EAX 0x38                    ; GET_RANDOM_INT
CALL [EAX]                      ; store random int into ECX
POP EAX                         ; restore GET_DEVICE_ADDR address
POP EBX                         ; restore COUNTER
PUSH EAX
ADD EAX 0x59                    ; WRITE_VIDEO
PUSH EBX                        ; store counter to use in WRITE_VIDEO
PUSH EBX                        ; store counter to use after WRITE_VIDEO
CALL [EAX]                      ; write color from ECX to VIDEO
POP EBX                         ; restore COUNTER
POP EAX                         ; restore GET_DEVICE_ADDR address


INCREMENT:
INC EBX
CMP EBX 0x08
PUSH EBX
JE RESET

LOOP:
;; CMP EAX 0x2F0
JNE DRAW