21 lines
401 B
ArmAsm
21 lines
401 B
ArmAsm
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.define Asp
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! This subroutine adds an offset to the stackpointer,
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! e.g. after the return from a procedurecall.
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! The offset is in registerpair AX, and is added to the
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! stackpointer.
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Asp:
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tay ! save A
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txa ! get X
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clc
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adc SP+2 ! add adjustment (lowbyte)
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sta SP+2 ! new stackpointer (lowbyte)
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tya ! get A
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adc SP+1 ! add adjustment (highbyte)
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sta SP+1 ! get stackpointer (highbyte)
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rts
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