collapseos/blk/290
Virgil Dupras 5adbf88591 z80: move lbluflw code around
with uflw checks not being in next anymore, we can save ourselves
a forward jump.
2020-08-08 08:19:31 -04:00

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lbluflw BSET ( abortUnderflow )
DE BIN( @ 0x06 ( uflw ) + LDdd(n),
JR, lblexec BWR
lblchkPS BSET ( chkPS )
( Note that you only need to call this in words that push
back to PSP. If they don't, calling chkPS is redundant with
check in next )
EXX,
( We have the return address for this very call on the stack
and protected registers. 2- is to compensate that. )
HL PS_ADDR 2- LDdn,
SP SUBHLd,
EXX,
CNC RETc, ( PS_ADDR >= SP? good )
JR, lbluflw BWR