51 lines
782 B
ArmAsm
51 lines
782 B
ArmAsm
; ___ ___ _____ ___ ___ __ _ _
|
|
; | _ \ __|_ _| _ \/ _ \ / / | | (_)_ _ _ ___ __
|
|
; | / _| | | | / (_) | / / | |__| | ' \ || \ \ /
|
|
; |_|_\___| |_| |_|_\\___/ /_/ |____|_|_||_\_,_/_\_\
|
|
;
|
|
; This is the minimal startup + I/O functionality needed to run
|
|
; RETRO on a Linux x86 system.
|
|
; =============================================================
|
|
|
|
bits 32
|
|
|
|
section .text
|
|
global putchar
|
|
global getchar
|
|
global _start
|
|
extern main
|
|
|
|
align 4
|
|
|
|
_start:
|
|
call main
|
|
jmp $
|
|
|
|
align 4
|
|
putchar:
|
|
mov eax, [esp+4]
|
|
mov [buf], eax
|
|
mov edx, 1
|
|
mov ecx, buf
|
|
mov ebx, 1
|
|
mov eax, 4
|
|
int 0x80
|
|
ret
|
|
|
|
align 4
|
|
getchar:
|
|
mov edx, 1
|
|
mov ecx, buf
|
|
mov ebx, 0
|
|
mov eax, 3
|
|
int 0x80
|
|
mov eax, 0
|
|
mov eax, [buf]
|
|
ret
|
|
|
|
section .data
|
|
buf:
|
|
dd 0
|
|
dd 0
|
|
dd 0
|
|
dd 0
|