please explain eeeeeeverything about this asm code files.

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; ----------------------------------------------------------------------------------------------------------- _DATA SEGMENT hello_msg db "Hello world", 0 info_msg db "Info", 0 _DATA ENDS ; ----------------------------------------------------------------------------------------------------------- ; Text or code segment ; ----------------------------------------------------------------------------------------------------------- _TEXT SEGMENT ; Needed windows functions to show a MessageBox EXTERN MessageBoxA: PROC EXTERN GetForegroundWindow: PROC ; The PUBLIC modifier will make your function visible and callable outside PUBLIC hello_world_asm hello_world_asm PROC push rbp ; save frame pointer mov rbp, rsp ; fix stack pointer ;sub rsp, 8 * (4 + 2) ; allocate shadow register area + 2 QWORDs for stack alignment sub rsp, 32 ; Get a window handle call GetForegroundWindow add rsp, 32 mov rcx, rax ; rax contains window handle ; WINUSERAPI int WINAPI MessageBoxA( ; RCX => _In_opt_ HWND hWnd, ; RDX => _In_opt_ LPCSTR lpText, ; R8 => _In_opt_ LPCSTR lpCaption, ; R9 => _In_ UINT uType); mov rdx, offset hello_msg mov r8, offset info_msg mov r9, 0 ; MB_OK sub rsp, 32 ;and rsp, not 8 ; align stack to 16 bytes prior to API call ;sub rsp, 8 ; mess up the alignment call MessageBoxA add rsp, 32 ; epilog. restore stack pointer mov rsp, rbp pop rbp ret hello_world_asm ENDP _TEXT ENDS END

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cpp file is...

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#include #include #include #include

// External assembly functions we want to call from here extern "C" { void hello_world_asm(); };

int main() { hello_world_asm(); return 0; }