UKSWIV (changes)

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Programmer's Reference Manuals

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» Software Vector NumbersUKSWIV

Unknown SWI Vector (24)

Use

This vector is called when an SWI with an unknown number is issued.

Notes

When an SWI is called, the following steps are taken:

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 also

• Introduction to SWI names and numbers
• OS_ChangeEnvironment
• Software Vector Numbers