x64 assembly windows
includelib kernel32.lib ; Windows kernel interface
GetStdHandle proto ; Function to retrieve I/O handle
WriteConsoleA proto ; Function writes to command window
Console equ -11 ; Device code for console text output
ExitProcess proto
.code
main proc
sub RSP, 40 ; Reserve "shadow space" on stack
; Obtain "handle" for console display monitor I/O Streams
mov RCX, Console ; Console standard output handle
call GetStdHandle ; Returns handle in register RAX
mov stdout, RAX ; Save handle for text display
; Display the "Hello, World!" Message
mov RCX, stdout ; Handle to standard output device
lea RDX, msg ; Pointer to message (byte array)
mov R8, lengthof msg ; Number of characters to display
lea R9, nbwr ; Number of btes actually written
call WriteConsoleA ; Write text to command window
add RSP, 40 ; Replace "shadow space" on stack
mov RCX, 0 ; Set exit status code to zero
call ExitProcess ; Return control to Windows
main endp
.data
msg byte "Hello, World!"
stdout qword ? ; Handle to standard output device
nbwr qword ? ; Number of bytes actually written
end