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72 lines
1.4 KiB
ArmAsm
72 lines
1.4 KiB
ArmAsm
; utility routine to copy memory
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.include "zeropage.inc"
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.export copymem
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.exportzp copy_src = ptr1
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.exportzp copy_dest = ptr2
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.bss
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end: .res 1
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.code
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; copy memory
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; inputs:
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; copy_src is address of buffer to copy from
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; copy_dest is address of buffer to copy to
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; AX = number of bytes to copy
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; outputs: none
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copymem:
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sta end
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ldy #0
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cpx #0
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beq @tail
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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bne :-
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inc copy_src+1 ; next page
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inc copy_dest+1 ; next page
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dex
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bne :-
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@tail:
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lda end
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beq @done
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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cpy end
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bne :-
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@done:
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rts
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; -- LICENSE FOR copymem.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Per Olofsson,
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; MagerValp@gmail.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Per Olofsson. All Rights Reserved.
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; -- LICENSE END --
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