I'm trying to create dll using VS 2017.
The dll will have one proc: symbol_count.
It asks to enter the string and then set symbol what is needed to count.
.def file
LIBRARY name
EXPORTS
symbol_count
Code:
.586
.model flat, stdcall
option casemap: none
include C:\masm32\include\windows.inc
include C:\masm32\include\user32.inc
include C:\masm32\include\msvcrt.inc
includelib C:\masm32\lib\msvcrt.lib
includelib C:\masm32\lib\user32.lib
.data
msg_string db 'Enter string: ', 0
msg_symbol db 'Enter symbol: ', 0
result db 'Count = %d', 0
str_modifier db '%s', 0
sym_modifier db '%c', 0
.data
string db ?
symbol db ?
DllEntry PROC hInstDLL:DWORD, reason:DWORD, reserved:DWORD
mov eax, 1
ret
DllEntry ENDP
symbol_count PROC
invoke crt_printf, OFFSET msg_string
invoke crt_scanf, OFFSET str_modifier, OFFSET string
invoke crt_printf, OFFSET msg_symbol
invoke crt_scanf, OFFSET sym_modifier, OFFSET symbol
xor esi, esi
xor ecx, ecx
mov ebx, OFFSET string
mov ecx, eax
mov al, symbol
loop1: <------------------------------------------ A2108
cmp byte ptr [ebx + ecx], 0
je endloop <------------------------------ A2107
cmp al, byte ptr [ebx + ecx]
jne next <-------------------------------- A2107
inc esi
next: <------------------------------------------- A2108
inc ecx
jmp loop1 <------------------------------- A2107
endloop: <---------------------------------------- A2108
invoke crt_printf, OFFSET result, esi
ret
symbol_count ENDP
End DllEntry
Here is the list of error messages, what a compiler gives to me: ( in the code, I marked the places where the compiler swears)
A2108 use of register assumed to ERROR
A2108 use of register assumed to ERROR
A2108 use of register assumed to ERROR
A2107 cannot have implicit far jump or call to near label
A2107 cannot have implicit far jump or call to near label
A2107 cannot have implicit far jump or call to near label
procedure argument or local not referenced : hInstDLL } all this points
procedure argument or local not referenced : reason } to DllEntry ENDP
procedure argument or local not referenced : reserved }
"You put your code into the .data section which may or may not cause some of the errors. The last 3 should just be warnings as you don't use the arguments." – @Jester