=> R1 = internal file handle returned by FSEntry_Open
R2 = pointer to buffer to read into
R3 = length to read
R4 = offset from which to read
<= all preserved
This entry point is called when data is needed to be read from a file for which FileSwitch has no buffered data. This will not be performed on the initial open, but only on subsequent access to the file.
Memory addresses are not guaranteed to be word aligned.
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