=> R0 - R8 = register parameters for SWI
R11 = SWI number
When an SWI is called RISC OS
1 Checks if the SWI number is < 512 - if so it calls the appropriate kernel SWI
2 Checks whether any relocatable module defines that SWI via its SWI table
3 If no module claims the SWI it is passed to this vector, where it may be claimed
4 Any SWIs still unrecognised is passed to the unknown SWI handler, set up by OS_ChangeEnvironment
See PRM 1, page 83.
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