Solved Tibia! Function's arguments in asm (registers)

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bialyro321

Newbie
Aug 12, 2016
1
62
0
Hey buddies,

i have one trouble with code.
i've made a pointer to a function to call it whenever i want.

C++:
typedef void( __fastcall  *PlayerSay )( char* );
PlayerSay __playerSay = (PlayerSay)(0x2DAE80);

public: void say(char* arg) {
        asm( "mov %esi, [ebp+8] \n\
              mov %eax, [ebp+8]");
        __playerSay(arg);
    }
but there is a problem. the registers im calling are different than registers when game is calling it.
take a look:
C++:
GAME CALL FUNCTION (working):
EAX 037ECC80 ASCII "Yo dude xD"
ECX 00A4E730
EDX 00000000
EBX 037EC990
ESP 00A4E694
EBP 00A4EE38
ESI 037ECC80 ASCII "Yo dude xD"
EDI 00000001
EIP 0013F452 Telania.0013F452
C++:
I CALL FUNCTION (not working)
EAX 002DAE80 Telania.002DAE80
ECX 67D8303F ASCII "Fuck my hax"
EDX 00000000
EBX 00000000
ESP 02A2FCE0
EBP 02A2FD00
ESI 67D8303F ASCII "Fuck my hax"
EDI 00000000
EIP 002DAE81 Telania.002DAE81
i know that __fastcall is changing EAX into " 002DAE80 --- Telania.002DAE80" .
so what can i change register EAX ?



and in:
C++:
public: void say(char* arg) {
     ...
}
how arguments go to the registers?
is that:
1arg go to EAX
2arg go to ECX
3arg go to EDX etc? is there any order?

ty for halp!
 
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