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29 lines
627 B
ArmAsm
29 lines
627 B
ArmAsm
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; Ullrich von Bassewitz, 25.11.2002
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; CC65 runtime: Swap x bytes of register variable space
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.export regswap
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.importzp c_sp, regbank, tmp1
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.proc regswap
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sta tmp1 ; Store count
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@L1: lda regbank,x ; Get old value
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pha ; Save it
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lda (c_sp),y ; Get stack loc
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sta regbank,x ; Store new value
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pla
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sta (c_sp),y ; Store old value
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inx
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iny
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dec tmp1
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bne @L1
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rts
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.endproc
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