[lDOS] Int 21h functions 25h and 35h should be reentrant, not use DOS stacks

Title	[lDOS] Int 21h functions 25h and 35h should be reentrant, not use DOS stacks
Author	E. C. Masloch
Created	2026-06-07 09:40:16 +0200 Jun Sun
State	closed

The interrupt list states that the interrupt vector query and hook functions may use no DOS stacks on some DOS versions. Enhanced DR-DOS sources state:

WARNING - use no stack as device drivers have called us re-entrantly

E. C. Masloch on 2026-06-07 09:47:43 +0200 Jun Sun

Fixed in hg 8b275773dc26 on 2026-04-26. Note that the ALTVECT build option is not honoured by this code. In the original source texts, if that option is set then some interrupt numbers are replaced.