Virus Experts Forums :: Offset jump question

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InteriArt Member	Posted: 3-Apr-2005 13:01:49 Hi, can any one tell me please asm code most likely one or two lines of asm code, witch would jump from one program to another in same file. Technicly the thing is simple .. I have 1 exe file .. with 2 programs combined in one exe file .. so if I run the exe it runs the first program .. I need the asm code witch would direct the first program to jump to the secound programs starting offset .. I`m not quite sure but I think it should be like this JMP OFFSET [offset], but im not quite sure about my confidence in this matter !
amir Admin	Posted: 29-May-2005 20:06:53 · Edited by: amir You will definitely need to use the JMP instruction. You can call jump to an address contained in a register, memory location, or a label. In the case of a label, depending on the distance, a short, near, or far jump will be made. Although I am not an assembly programmer, I can think of one way to specify an offset: ThisLabel: LEA eax, ThisLabel ADD eax, <offset> JMP eax This assumes you already know the offset amount... Also, I think offset addressing is limited to 4-bytes, which means you cannot jump more than 4 kb away!

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