Get the Whitepaper called Writing JIT-Spray Shellcode For Fun And Profit.
You can download it from the following link: https://packetstormsecurity.com/files/download/86975/Writing-JIT-Spray-Shellcode.pdf
Source: https://packetstormsecurity.com/files/86975/Writing-JIT-Spray-Shellcode-For-Fun-And-Profit.html