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‎README.md

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# nasm

‎window/example1/Cmakelists.txt

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cmake_minimum_required(VERSION 3.27)
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project(asm64)
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enable_language(ASM_NASM)
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set(SOURCE_FILES src/BasicWindow64.asm)
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add_executable(MyWindowedApp ${SOURCE_FILES})
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set_target_properties(MyWindowedApp PROPERTIES LINK_FLAGS "/ENTRY:Start /SUBSYSTEM:WINDOWS")
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target_link_libraries(MyWindowedApp kernel32.lib user32.lib)

‎window/example1/build.bat

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nasm -f win64 src/BasicWindow64.asm -o build/BasicWindow64.obj
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link /OUT:build/BasicWindow64.exe /SUBSYSTEM:WINDOWS /ENTRY:Start build/BasicWindow64.obj kernel32.lib user32.lib

‎window/example1/src/BasicWindow64.asm

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; Basic Window, 64 bit. V1.02
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COLOR_WINDOW EQU 5 ; Constants
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CS_BYTEALIGNWINDOW EQU 2000h
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CS_HREDRAW EQU 2
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CS_VREDRAW EQU 1
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CW_USEDEFAULT EQU 80000000h
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IDC_ARROW EQU 7F00h
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IDI_APPLICATION EQU 7F00h
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IMAGE_CURSOR EQU 2
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IMAGE_ICON EQU 1
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LR_SHARED EQU 8000h
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NULL EQU 0
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SW_SHOWNORMAL EQU 1
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WM_DESTROY EQU 2
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WS_EX_COMPOSITED EQU 2000000h
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WS_OVERLAPPEDWINDOW EQU 0CF0000h
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WindowWidth EQU 640
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WindowHeight EQU 480
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extern CreateWindowExA ; Import external symbols
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extern DefWindowProcA ; Windows API functions, not decorated
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extern DispatchMessageA
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extern ExitProcess
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extern GetMessageA
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extern GetModuleHandleA
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extern IsDialogMessageA
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extern LoadImageA
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extern PostQuitMessage
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extern RegisterClassExA
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extern ShowWindow
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extern TranslateMessage
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extern UpdateWindow
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global Start ; Export symbols. The entry point
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section .data ; Initialized data segment
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WindowName db "Basic Window 64", 0
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ClassName db "Window", 0
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section .bss ; Uninitialized data segment
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alignb 8
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hInstance resq 1
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section .text ; Code segment
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Start:
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sub RSP, 8 ; Align stack pointer to 16 bytes
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sub RSP, 32 ; 32 bytes of shadow space
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xor ECX, ECX
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call GetModuleHandleA
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mov qword [REL hInstance], RAX
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add RSP, 32 ; Remove the 32 bytes
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call WinMain
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.Exit:
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xor ECX, ECX
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call ExitProcess
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WinMain:
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push RBP ; Set up a stack frame
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mov RBP, RSP
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sub RSP, 136 + 8 ; 136 bytes for local variables. 136 is not
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; a multiple of 16 (for Windows API functions),
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; the + 8 takes care of this.
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%define wc RBP - 136 ; WNDCLASSEX structure, 80 bytes
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%define wc.cbSize RBP - 136 ; 4 bytes. Start on an 8 byte boundary
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%define wc.style RBP - 132 ; 4 bytes
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%define wc.lpfnWndProc RBP - 128 ; 8 bytes
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%define wc.cbClsExtra RBP - 120 ; 4 bytes
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%define wc.cbWndExtra RBP - 116 ; 4 bytes
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%define wc.hInstance RBP - 112 ; 8 bytes
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%define wc.hIcon RBP - 104 ; 8 bytes
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%define wc.hCursor RBP - 96 ; 8 bytes
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%define wc.hbrBackground RBP - 88 ; 8 bytes
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%define wc.lpszMenuName RBP - 80 ; 8 bytes
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%define wc.lpszClassName RBP - 72 ; 8 bytes
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%define wc.hIconSm RBP - 64 ; 8 bytes. End on an 8 byte boundary
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%define msg RBP - 56 ; MSG structure, 48 bytes
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%define msg.hwnd RBP - 56 ; 8 bytes. Start on an 8 byte boundary
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%define msg.message RBP - 48 ; 4 bytes
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%define msg.Padding1 RBP - 44 ; 4 bytes. Natural alignment padding
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%define msg.wParam RBP - 40 ; 8 bytes
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%define msg.lParam RBP - 32 ; 8 bytes
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%define msg.time RBP - 24 ; 4 bytes
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%define msg.py.x RBP - 20 ; 4 bytes
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%define msg.pt.y RBP - 16 ; 4 bytes
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%define msg.Padding2 RBP - 12 ; 4 bytes. Structure length padding
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%define hWnd RBP - 8 ; 8 bytes
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mov dword [wc.cbSize], 80 ; [RBP - 136]
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mov dword [wc.style], CS_HREDRAW | CS_VREDRAW | CS_BYTEALIGNWINDOW ; [RBP - 132]
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lea RAX, [REL WndProc]
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mov qword [wc.lpfnWndProc], RAX ; [RBP - 128]
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mov dword [wc.cbClsExtra], NULL ; [RBP - 120]
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mov dword [wc.cbWndExtra], NULL ; [RBP - 116]
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mov RAX, qword [REL hInstance] ; Global
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mov qword [wc.hInstance], RAX ; [RBP - 112]
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sub RSP, 32 + 16 ; Shadow space + 2 parameters
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xor ECX, ECX
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mov EDX, IDI_APPLICATION
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mov R8D, IMAGE_ICON
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xor R9D, R9D
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mov qword [RSP + 4 * 8], NULL
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mov qword [RSP + 5 * 8], LR_SHARED
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call LoadImageA ; Large program icon
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mov qword [wc.hIcon], RAX ; [RBP - 104]
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add RSP, 48 ; Remove the 48 bytes
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sub RSP, 32 + 16 ; Shadow space + 2 parameters
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xor ECX, ECX
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mov EDX, IDC_ARROW
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mov R8D, IMAGE_CURSOR
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xor R9D, R9D
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mov qword [RSP + 4 * 8], NULL
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mov qword [RSP + 5 * 8], LR_SHARED
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call LoadImageA ; Cursor
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mov qword [wc.hCursor], RAX ; [RBP - 96]
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add RSP, 48 ; Remove the 48 bytes
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mov qword [wc.hbrBackground], COLOR_WINDOW + 1 ; [RBP - 88]
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mov qword [wc.lpszMenuName], NULL ; [RBP - 80]
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lea RAX, [REL ClassName]
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mov qword [wc.lpszClassName], RAX ; [RBP - 72]
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sub RSP, 32 + 16 ; Shadow space + 2 parameters
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xor ECX, ECX
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mov EDX, IDI_APPLICATION
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mov R8D, IMAGE_ICON
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xor R9D, R9D
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mov qword [RSP + 4 * 8], NULL
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mov qword [RSP + 5 * 8], LR_SHARED
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call LoadImageA ; Small program icon
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mov qword [wc.hIconSm], RAX ; [RBP - 64]
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add RSP, 48 ; Remove the 48 bytes
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sub RSP, 32 ; 32 bytes of shadow space
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lea RCX, [wc] ; [RBP - 136]
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call RegisterClassExA
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add RSP, 32 ; Remove the 32 bytes
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sub RSP, 32 + 64 ; Shadow space + 8 parameters
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mov ECX, WS_EX_COMPOSITED
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lea RDX, [REL ClassName] ; Global
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lea R8, [REL WindowName] ; Global
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mov R9D, WS_OVERLAPPEDWINDOW
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mov dword [RSP + 4 * 8], CW_USEDEFAULT
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mov dword [RSP + 5 * 8], CW_USEDEFAULT
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mov dword [RSP + 6 * 8], WindowWidth
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mov dword [RSP + 7 * 8], WindowHeight
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mov qword [RSP + 8 * 8], NULL
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mov qword [RSP + 9 * 8], NULL
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mov RAX, qword [REL hInstance] ; Global
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mov qword [RSP + 10 * 8], RAX
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mov qword [RSP + 11 * 8], NULL
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call CreateWindowExA
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mov qword [hWnd], RAX ; [RBP - 8]
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add RSP, 96 ; Remove the 96 bytes
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sub RSP, 32 ; 32 bytes of shadow space
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mov RCX, qword [hWnd] ; [RBP - 8]
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mov EDX, SW_SHOWNORMAL
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call ShowWindow
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add RSP, 32 ; Remove the 32 bytes
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sub RSP, 32 ; 32 bytes of shadow space
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mov RCX, qword [hWnd] ; [RBP - 8]
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call UpdateWindow
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add RSP, 32 ; Remove the 32 bytes
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.MessageLoop:
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sub RSP, 32 ; 32 bytes of shadow space
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lea RCX, [msg] ; [RBP - 56]
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xor EDX, EDX
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xor R8D, R8D
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xor R9D, R9D
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call GetMessageA
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add RSP, 32 ; Remove the 32 bytes
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cmp RAX, 0
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je .Done
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sub RSP, 32 ; 32 bytes of shadow space
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mov RCX, qword [hWnd] ; [RBP - 8]
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lea RDX, [msg] ; [RBP - 56]
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call IsDialogMessageA ; For keyboard strokes
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add RSP, 32 ; Remove the 32 bytes
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cmp RAX, 0
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jne .MessageLoop ; Skip TranslateMessage and DispatchMessageA
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sub RSP, 32 ; 32 bytes of shadow space
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lea RCX, [msg] ; [RBP - 56]
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call TranslateMessage
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add RSP, 32 ; Remove the 32 bytes
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sub RSP, 32 ; 32 bytes of shadow space
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lea RCX, [msg] ; [RBP - 56]
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call DispatchMessageA
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add RSP, 32 ; Remove the 32 bytes
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jmp .MessageLoop
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.Done:
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mov RSP, RBP ; Remove the stack frame
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pop RBP
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xor EAX, EAX
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ret
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WndProc:
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push RBP ; Set up a stack frame
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mov RBP, RSP
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%define hWnd RBP + 16 ; Location of the shadow space setup by
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%define uMsg RBP + 24 ; the calling function
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%define wParam RBP + 32
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%define lParam RBP + 40
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mov qword [hWnd], RCX ; Free up RCX RDX R8 R9 by spilling the
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mov qword [uMsg], RDX ; 4 passed parameters to the shadow space
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mov qword [wParam], R8 ; We can now access these parameters by name
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mov qword [lParam], R9
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cmp qword [uMsg], WM_DESTROY ; [RBP + 24]
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je WMDESTROY
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DefaultMessage:
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sub RSP, 32 ; 32 bytes of shadow space
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mov RCX, qword [hWnd] ; [RBP + 16]
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mov RDX, qword [uMsg] ; [RBP + 24]
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mov R8, qword [wParam] ; [RBP + 32]
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mov R9, qword [lParam] ; [RBP + 40]
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call DefWindowProcA
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add RSP, 32 ; Remove the 32 bytes
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mov RSP, RBP ; Remove the stack frame
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pop RBP
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ret
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WMDESTROY:
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sub RSP, 32 ; 32 bytes of shadow space
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xor ECX, ECX
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call PostQuitMessage
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add RSP, 32 ; Remove the 32 bytes
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xor EAX, EAX ; WM_DESTROY has been processed, return 0
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mov RSP, RBP ; Remove the stack frame
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pop RBP
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ret

‎window/example2/Cmakelists.txt

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cmake_minimum_required(VERSION 3.27)
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project(asm64)
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enable_language(ASM_NASM)
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set(SOURCE_FILES src/main.asm)
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add_executable(main ${SOURCE_FILES})
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set_target_properties(main PROPERTIES LINK_FLAGS "/ENTRY:main /SUBSYSTEM:CONSOLE /LARGEADDRESSAWARE:NO ")
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target_link_libraries(main kernel32.lib legacy_stdio_definitions.lib ucrt.lib )

‎window/example2/build.bat

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nasm -f win64 src/main.asm -o build/main.obj
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link build/main.obj /subsystem:console /entry:main /out:build/main.exe kernel32.lib legacy_stdio_definitions.lib ucrt.lib /LARGEADDRESSAWARE:NO

‎window/example2/src/main.asm

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bits 64
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default rel
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segment .data
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msg db "Hello world!", 0xd, 0xa, 0
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segment .text
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global main
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extern ExitProcess
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extern printf
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main:
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push rbp
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mov rbp, rsp
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sub rsp, 32
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lea rcx, [msg]
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call printf
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xor rax, rax
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call ExitProcess

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