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50 lines
1.0 KiB
ArmAsm
50 lines
1.0 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 1998-12-07, 2004-12-01
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;
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; Copy the data segment from the LOAD to the RUN location
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;
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.export copydata
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.import __DATA_LOAD__, __DATA_RUN__, __DATA_SIZE__
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.importzp ptr1, ptr2, tmp1
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copydata:
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lda #<__DATA_LOAD__ ; Source pointer
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sta ptr1
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lda #>__DATA_LOAD__
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sta ptr1+1
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lda #<__DATA_RUN__ ; Target pointer
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sta ptr2
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lda #>__DATA_RUN__
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sta ptr2+1
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ldx #<~__DATA_SIZE__
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lda #>~__DATA_SIZE__ ; Use -(__DATASIZE__+1)
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sta tmp1
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ldy #$00
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; Copy loop
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@L1: inx
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beq @L3
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@L2: lda (ptr1),y
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sta (ptr2),y
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iny
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bne @L1
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inc ptr1+1
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inc ptr2+1 ; Bump pointers
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bne @L1 ; Branch always (hopefully)
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; Bump the high counter byte
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@L3: inc tmp1
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bne @L2
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; Done
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rts
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