Next intruction to execute (IP)

[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.

[brewbuck]

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...

[matsp]

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:

jmp dword ptr [startaddress]


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

--
Mats