=> R0 = 0
R1 = pointer to page block
R2 = number of entries in the block
R3 = amount the area is growing by
R4 = current size of area, in bytes
R5 = page size, in bytes
R12 = workspace pointer passed to OS_DynamicArea 0 or base of area.
<= all preserved, unless grow is disallowed
This handler is called when a call to OS_ChangeDynamicArea results in an area growing, before any pages are actually moved. It is issued just before the pages themselves are allocated to the block.
You can request that specific pages be used for growing the area by filling in their page numbers in the page block. If you do so, you must specify all the pages. The first entry in the page block corresponds to the lowest memory address of the extension, and the last entry in the page block the highest memory address.
You can prevent the area changing size by returning an error. R0 should point to a standard error block, or be set to zero for a generic error message to be used. You should then return with the V flag set.
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