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z80: use named labels for boot routines The usage of numerotated labels for this was becoming severly confusing.
2020-06-18 21:16:40 +10:00
lblchkPS BSET ( chkPS )
z80: optimize chkPS Inline it in next and make chkPS, call a newly reserved label for it directly, removing a layer of indirection. This frees a spot in the stable ABI.
2020-06-14 23:48:10 +10:00
( 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
z80a: make mnemonic names more uniform across assemblers Initially, I used the same letters as those used in the z80 ref docs, but it makes the different assemblers harder to use than they should. Having consistent "argtype" rules across assemblers should help.
2020-06-28 12:01:56 +10:00
and protected registers. 2- is to compensate that. )
HL PS_ADDR 2- LDdn,
SP SUBHLd,
z80: optimize chkPS Inline it in next and make chkPS, call a newly reserved label for it directly, removing a layer of indirection. This frees a spot in the stable ABI.
2020-06-14 23:48:10 +10:00
EXX,
z80a: make mnemonic names more uniform across assemblers Initially, I used the same letters as those used in the z80 ref docs, but it makes the different assemblers harder to use than they should. Having consistent "argtype" rules across assemblers should help.
2020-06-28 12:01:56 +10:00
CNC RETc, ( PS_ADDR >= SP? good )
JR, lblofl BWR ( abortUnderflow-B298 )