Comment by alok-g

I could follow the part you have explained. Thanks still though.

>> But if I flip some specific bit in this instruction before jumping to it

Isn't the 'if' really happening in the above phrase? The rest of it is a modified jump address based on the above 'if' and just jumps to the modified address.

Now if I understand this correctly, how to do the above 'if', i.e., flip the address bit or not based on some condition?

May be it would begin from some bit read from IO which modifies an address. I saw that memory-mapped IO is used.