=> R0 = any number less than 0 for text->number
0-63 for number->text
R1 = pointer to control-terminated string for text->number
pointer to output buffer for number->text
R2 = offset within output buffer to place the text at for number->text
R3 = size of buffer for number->text
R12 = pointer to private word
R13 = Supervisor stack
R14 = Return address
<= R0 = SWI number AND 63 if SWI recognised, <0 otherwise for text->number
R2 = length of text, for number->text (RISC OS will write "\0" here)
Unused registers should be preserved
This entry is used as a alternative method of finding SWI numbers from names and vice versa. This code does not need to be re-entrant.
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