ClientASM/WinMain.cpp at master · Grimoric/ClientASM · GitHub

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#include <windows.h>
#include "Prototypes.h"
#include "Globals.h"

int __declspec(naked) WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
    __asm {
        // --- Traditional prologue without SEH ---
        push    ebp
        mov     ebp, esp
        sub     esp, 0x870
        push    ebx
        push    esi
        push    edi

        // --- Entry sequence ---
        call    sub_63b7d0

        push    offset sub_63ba80
        call    atexit
        add     esp, 4

        // 0064abde - Log entry point
        push    offset data_7d96ac // "reached winmain!\n"
        call    sub_63bcc0
        add     esp, 0x4

        // 0064abeb - Reset control variable
        mov     dword ptr[data_141c0a8], 0

        // 0064abf5 - Zero out buffer (256 bytes)
        push    0x100
        push    0
        push    offset data_1419a50
        call    vc6_memset
        add     esp, 0xc

        call    sub_64a880

        // 0064ac01 - Start Memory Manager
        call    sub_5b9a10

        // 0064ac13 - Register Memory Manager shutdown
        push    offset sub_5b9a60
        call    atexit
        add     esp, 4

        // 0064ac20 - Allocate object (4 bytes)
        push    4
        call    vc6_new
        add     esp, 4
        mov[ebp - 0x758], eax

        // Check if new succeeded
        cmp     dword ptr[ebp - 0x758], 0
        je      loc_failed_alloc

        // Call constructor: sub_5f8930(this)
        mov     ecx, [ebp - 0x758]
        call    sub_5f8930
        mov[ebp - 0x7f0], eax
        jmp     loc_store_ptr

        loc_failed_alloc :
        mov     dword ptr[ebp - 0x7f0], 0

        loc_store_ptr :
        mov     eax, [ebp - 0x7f0]
        mov[ebp - 0x754], eax
        mov     ecx, [ebp - 0x754]
        mov     dword ptr[data_18a4b8c], ecx

        // Register cleanup
        push    offset sub_64a7d0
        call    atexit
        add     esp, 4

        // --- Epilogue ---
        pop     edi
        pop     esi
        pop     ebx
        mov     esp, ebp
        pop     ebp
        ret     16
    }
}