Next intruction to execute (IP)

I have a script that load into memory a .exe file. I know the CS:IP address, but how can I execute code using this address and an interrupt of DOS after i have loaded file into memory. I'm using Turbo c++.

I have not to use interrupt 21h, 0x4b subfunction.

Quote:

---

Originally Posted by albert_sps

I have a script that load into memory a .exe file. I know the CS:IP address, but how can I execute code using this address and an interrupt of DOS after i have loaded file into memory. I'm using Turbo c++.

I have not to use interrupt 21h, 0x4b subfunction.

---

So basically your task is to rewrite DOS. Okay then...

You mean that you have loaded an executable into memory, but you don't know how to "jump to it"?

It's pretty simple really, just store the start-address (CS:IP) in memory, and use the indirect jump instruction:

Code:

---

    jmp dword ptr [startaddress]

---

Now, how you get back to where you started is a different matter.

--
Mats