Can't compile inline assembly

I am unable to compile an assembly file in Visual Studio 2017.
I am unsure weather this is due to visual studio or because i made some mistakes in the code, pls help me.

I have a c++ main file in which I go for the call:

#include "stdafx.h"
#include "myStruct.h"

extern "C" __int64 CalcStructSum_(const myStruct *kekStruct);

int _tmain(int argc, _TCHAR* argv)

myStruct kek;
kek.Val8 = 8;
kek.Val16 = 16;
kek.Val32 = 32;
kek.Val64 = 64;


__int64 summe = CalcStructSum_(&kek);

printf("summe betraegt: %d", summe);
getchar();

return 0;



mystruct.h :

#pragma once

typedef struct

__int8 Val8;
__int8 Pad8;
__int16 Val16;
__int32 Val32;
__int64 Val64;

myStruct;


here the assembly equivalent:

myStruct struct
Val8 byte ?
Pad8 byte ?
Val16 word ?
Val32 dword ?
Val64 qword ?
myStruct ends


and here is the assembly file:

.model flat,c
include myStruct_.inc


.code

;prolog and function start

CalcStructSum_ proc

push ebp
mov ebp,esp
push ebx
push esi


; das struct liegt auf dem stack
; alle felder wurden auf 32 bit sign-extended
; in esi kommt anfang des speicherbereichs rein
; später wird quasi [basereg + dispatch] daraus interpretiert

mov esi, [ebp+8] ; get a pointer to "mystruct"

; load 8- and 16bit sources into 32bit registers (movsx)
; this is necassery to load struct-fields from the stack

movsx eax, byte ptr [esi + myStruct.Val8] ; [baser. + disp]
movsx ecx, word ptr [esi + myStruct.Val16]
add eax, ecx

; now sign-extend eax register to 64bit
; high part: edx , low part: eax
cdq

;save result for later
mov ebx, eax
mov ecx, edx

; now load the int-part of the struct and add it
; (it must be sign-extended to edx:eax again)

mov eax, [esi + myStruct.Val32]
cdq

; (the high-part must be added with carry, if overflown)
add eax, ebx
adc edx, ecx

; now, get the long from stack

add eax, dword ptr [esi + myStruct.Val64] ; low part
adc edx, dwprd ptr [esi + myStruct.Val64 + 4] ; high part

; we now have the sum of all structure fields in the register pair edx:eax

pop esi
pop ebx
pop ebp

ret

CalcStructSum_ endp
end


Also, I included the files in my explorer window like this (and, of course, set build dependencies):

I also tried assembling from powershell with ml.exe, but no luck here either.
Also, it would be nice if someone could point out a simple method to capture the output of ml.exe, it is instantly away after execution (am a cmd-noob).

Finally, I tried putting the files in ANSI mode, but this should not be an issue at all, I just read through old stackoverflow answerers.

What am I missing? Should I turn back to VS2010 maybe? Or is it just an idiotic syntax error? This really freaks me out since such a simple proof-of-concept program should not be so hard to write -.-

mov eax, [rdi]

pop eax

mov eax, [eax]

1 Answer
1

Ok, problem is solved:

Turned out it was a by typo in line 50 [ "dwprd" instead of "dword" ].

Fixed and solved.
If anybody comes accross a situation like mine, where they just can't find any usefull hints provided by the assembler / IDE , then here is how i found the solution:

[ in windows OS ]

dwprd

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