Windows API example

Main.asm

; Copyright (c) 2020 Chanjung Kim. All rights reserved.

.data

text            db  "Hello, world!", 0
caption         db  "My title", 0

.code

extern GetStdHandle: proc
extern ReadConsoleA: proc
extern WriteConsoleA: proc
extern MessageBoxA: proc

mainCRTStartup proc
    ; char buffer[20];
    ; DWORD read, written;
    sub     rsp,                104

    ; ReadConsoleA(GetStdHandle(STD_INPUT_HANDLE), &buffer, 20, &read, 0);
    mov     QWORD PTR 32[rsp],  0
    lea     r9,                 DWORD PTR 100[rsp]
    mov     r8d,                20
    lea     rdx,                DWORD PTR 76[rsp]
    mov     ecx,                -10
    call    GetStdHandle
    mov     rcx,                rax
    call    ReadConsoleA

    ; for (size_t i = 0; i < 5; ++i)
for1begin:
    xor     r10,                r10
for1cond:
    cmp     r10,                5
    jge     for1end
    ; {
for1body:

    mov     QWORD PTR 64[rsp],  r10

    ; WriteConsoleA(GetStdHandle(STD_OUTPUT_HANDLE), buffer, read, &written, 0);
    mov     QWORD PTR 32[rsp],  0
    lea     r9,                 DWORD PTR 96[rsp]
    mov     r8d,                DWORD PTR 100[rsp]
    lea     rdx,                DWORD PTR 76[rsp]
    mov     ecx,                -11
    call    GetStdHandle
    mov     rcx,                rax
    call    WriteConsoleA

    mov     r10,                QWORD PTR 64[rsp]
    inc     r10
    jmp     for1cond
    ; }
for1end:
    
    ; MessageBoxA(NULL, "Hello, world!", "My title", MB_OK);
    xor     r9d,                r9d
    lea     r8,                 caption
    lea     rdx,                text
    xor     ecx,                ecx
    call    MessageBoxA

    ; return 0;
    xor     rax,                rax
    add     rsp,                104
    ret
mainCRTStartup endp

END