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Pre Filter Code
Programmer's Reference Manuals
» Part 7 - The Desktop
» The Filter Manager
» SWI Calls
» Filter_RegisterPreFilter
» Pre Filter Code
| Entry | |
|---|---|
| R0 | Event reason code being returned for Pre Filters |
| R1 | Users event buffer |
| R2 | Task handle of task that called Wimp_Poll |
| R3 | Pointer to poll word if applicable |
| R12 | Value of R2 when filter registered |
| Exit |
|---|
| It must preserve all registers (other than R0) |
Notes
You may clear bits in R0 to provide a new event mask.
Please note: You must preserve all other registers (other than R0).