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d041b91846
Use EXX instead of the stack for HL protection and remove all spurious uses of chkPS, I wanted to inline chkPS in next because of its "tight loop" status, but for reasons I don't understand, doing so breaks Collapse OS. Later...
14 lines
433 B
Plaintext
14 lines
433 B
Plaintext
PC ORG @ 0x1e + ! ( chkPS )
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( Note that you only need to call this in words that push
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back to PSP. If they don't, calling chkPS is redundant with
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check in next )
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EXX,
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( We have the return address for this very call on the stack
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and protected registers. 2 - is to compensate that. )
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HL PS_ADDR 2 - LDddnn,
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SP SUBHLss,
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EXX,
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CNC RETcc, ( PS_ADDR >= SP? good )
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JR, L2 BWR ( abortUnderflow-B298 )
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