OpenEuphoria

Data Execute Mode and Data Execute Protection

Data Execute Mode makes data that will be returned from allocate executable. On some systems you will not be allowed to run code in memory returned from allocate unless this mode has been enabled. This restriction is called Data Execute Protection or D.E.P.. When writing software you should use allocate_code or allocate_protect to get memory for execution. This is more efficient and more secure than using Data Execute mode. Because many hacker exploits of software use data buffers and then trick software into running this data, Data Execute Protection stops an entire class of exploits.

If you get a Data Execute Protection Exception from running software, it means that D.E.P. could have thwarted an attack! Your application crashes and your computer wasn't infected. However, many people will decide that they want to disable D.E.P. because they know that they call memory returned by allocate or perhaps they are simply careless.

Type Sorted Function List

Executable Memory

Executable Memory is the way to run code on the stack in a completly portable way.

Use the following Routines:

Use allocate_code to allocate some executable machine-code, call to call the code, and free_code to free the machine-code.

Using Data Bytes

In C, bytes are called 'char' or 'BOOL' or 'boolean'. They sometimes are used for very small numbers but mostly, they are used in C-strings. See Using Strings.

Use allocate_data to allocate data and return an address. Use poke to save atoms or sequences to at an address. Use peeks or peek to read from an address. Use mem_set and mem_copy to set and copy sections of memory. Use free to free or use delete if you enabled cleanup in allocate_data.