if the functions that are called by "CallFunction" are 32-bit libraries functions etc, then you should not have a problem to compile this on 64-bit pascal, but if you re-compile the libs it calls into 64-bit then you will have a-lot of work ahead.
What i would suggest is to rename this function to CallFunctionX86(... and make sure all pointers and variables used are 32-bit standard, e.g. pointer should be 32-bit pointer (i don't use freepascal dunno which you will need to use)
then you can create a new function CallFunctionX64(
This would be similar but using 64-bit variables and registers.
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