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 No Execution of Data
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     The protected-mode addressing system maintains a strong separation
     between code and data.  You cannot execute code within a data segment.
     If you branch to or execute a call into a data segment, a protection
     fault occurs.

     Most of the time, executing data is unintentional.  However, some
     assembly-language programs intentionally branch to data.  For example,
     some programs construct instructions in a data area on the stack to
     invoke an interrupt handler and then jump to the dynamically generated
     code.