Hi
I want to do some opcode patching to speed up my virtual machine.
For this I tried to find the Intel hex opcodes for CALL instructions.
Reason: I need absolute addresses as call targets.
Hex E8 aa aa aa aa however calls only relative to the actual instruction pointer, i.e. the address (IP + aaaaaaaa) is called.

But I need to call an absolute address. Is there another opcode instead of E8 that will do so?

Thanx
Akko

Your virtual machine?
And you ask such questions?

There is no way to call absolute address using immiediate value. You need the modrm variant.

Akko, welcome!

Opcode 9A is an absolute ("far") call.

use16
jmp far dword 0123h:0ABCDh = EA CD AB 23 01

edfed, I think he wanted to CALL, not JMP

BTW, I've been looking through some old interesting threads from my long absence, and I found this: http://board.flatassembler.net/topic.php?t=10980
I assume it never happened? I like your idea though, it is a bit like a memory OS

yeah, sorry, but it is the same

use16
call far dword 0123h:0ABCDh = 9A CD AB 23 01
use32
call far fword 0ABCDh:01234567h = 9A 67 45 23 01 CD AB

problem solved.

now, return to pic programming