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34 lines
657 B
ArmAsm
34 lines
657 B
ArmAsm
;
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; Ullrich von Bassewitz, 06.08.1998
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; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
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;
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; CC65 runtime: swap ax with TOS
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;
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.export swapstk
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.importzp c_sp, ptr4
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swapstk:
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sta ptr4
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stx ptr4+1
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ldy #1 ; index
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lda (c_sp),y
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tax
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lda ptr4+1
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sta (c_sp),y
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.if .cap(CPU_HAS_ZPIND)
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lda (c_sp)
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tay
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lda ptr4
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sta (c_sp)
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tya
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.else
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dey
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lda (c_sp),y
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pha
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lda ptr4
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sta (c_sp),y
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pla
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.endif
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rts ; whew!
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