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49 lines
691 B
ArmAsm
49 lines
691 B
ArmAsm
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; Ullrich von Bassewitz, 25.10.2000
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; CC65 runtime: Increment the stackpointer by 2. For performance reasons,
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; this modules does also contain the popax function.
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.export popax, incsp2
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.importzp sp
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; Pop a/x from stack. This function will run directly into incsp2
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.proc popax
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ldy #1
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lda (sp),y ; get hi byte
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tax ; into x
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.ifpc02
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lda (sp) ; get lo byte
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.else
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dey
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lda (sp),y ; get lo byte
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.endif
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.endproc
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.proc incsp2
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ldy sp ; 3
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iny ; 2
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beq @L1 ; 2
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iny ; 2
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beq @L2 ; 2
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sty sp ; 3
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rts
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@L1: iny ; 2
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@L2: sty sp ; 3
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inc sp+1 ; 5
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rts
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.endproc
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