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collapseos/blk/082
Virgil Dupras 816563e2e3 Stop LOADing on ABORT
This is done by adding a "C<* override" layer that is reset to 0 on
ABORT.

The problem was that when ABORT happened during a LOAD, we had a
resetted RSP and started from a clean INTERPRET, but LOAD didn't
have the opportunity to restore C<*, which caused it to continue
interpreting from the faulty BLK.

With a C<* override, we don't need to *restore* C<*, we just need to
clear the override.
2020-04-24 14:10:40 -04:00

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INITIAL_SP holds the initial Stack Pointer value so
that we know where to reset it on ABORT
CURRENT points to the last dict entry.
HERE points to current write offset.
IP is the Interpreter Pointer
PARSEPTR holds routine address called on (parse)
C<* holds routine address called on C<. If the C<* override
at 0x08 is nonzero, this routine is called instead.
(cont.)