collapseos/blk/281

RESERVED REGISTERS: At all times, IX points to RSP TOS and IY
is IP. SP points to PSP TOS, but you can still use the stack\
in native code. you just have to make sure you've restored it
before "next".

STABLE ABI: The boot binary starts with a list of references.
The address of these references have to stay to those addr-
esses. The rest of the Collapse OS code depend on it. In fact,
up until 0x67, the (?br) wordref, pretty much everything has
to stay put.

The boot binary is loaded in 2 parts. The first part, "decla-
rations", are loaded after xcomp, before xcomp overrides, with
"282 LOAD". The rest, after xcomp overrides, with "283 335
LOADR".