I have written an exploit using pwn tools and it works fine for ret2text. but when i debug the binary using gdb in linux, I change the return address of vulnfunc to target address which contains system but i am unable to execute the system function and it gives an error memory at ********* can’t be accessed. When i focused more, i came to know that as soon as my target function is access my registers change from 32 bit to 64 bit. Can anyone explain this?before executing vulnfunc