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collapseos/blk/286
Virgil Dupras b9fb6a6226 z80: move boot code around
Bring native words together, make the next/exec/does/compiled
cluster be at the beginning.

Next step: bring find code into _find word.
2020-07-05 22:23:40 -04:00

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lblnext BSET PC ORG @ 0x1b + ! ( next )
( This routine is jumped to at the end of every word. In it,
we jump to current IP, but we also take care of increasing
it by 2 before jumping. )
( Before we continue: are stacks within bounds? )
( PS ) HL PS_ADDR LDdn,
SP SUBHLd,
JRC, lblofl BWR ( abortUnderflow-B285 )
( RS ) IX PUSH, HL POP,
DE RS_ADDR LDdn,
DE SUBHLd,
JRC, lblofl BWR ( IX < RS_ADDR? abortUnderflow-B285 )
E 0 IY+ LDrIXY,
D 1 IY+ LDrIXY,
IY INCd, IY INCd,
( continue to execute )