Difference between revisions of "CSC231 Homework 3 Solutions 2010"
(Created page with '--~~~~ ---- =hw3a.asm= <code><pre> ;;; ; ; Ashley Smith ;;; ; ; 231a-ae ;;; ; ; 6 October 2010 ;;; ; ; hw3a.asm (Problem #1 of Homework 3) ;;; ; ; ;;; ; ; Moves the contents of a…') |
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--[[User:Thiebaut|D. Thiebaut]] 14:18, 15 October 2010 (UTC) | --[[User:Thiebaut|D. Thiebaut]] 14:18, 15 October 2010 (UTC) | ||
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=hw3a.asm= | =hw3a.asm= | ||
<code><pre> | <code><pre> | ||
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add ah, byte[tableb] ; add "1" to ah | add ah, byte[tableb] ; add "1" to ah | ||
mov byte[tablew], ah ; ah -> 1st B of tablew | mov byte[tablew], ah ; ah -> 1st B of tablew | ||
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;; using a word | ;; using a word | ||
mov ax, word[tableb+1] ; "10" and "0xff" -> ax | mov ax, word[tableb+1] ; "10" and "0xff" -> ax | ||
mov byte[tablew+1*2], al ; "10" -> 3rd B of tablew | mov byte[tablew+1*2], al ; "10" -> 3rd B of tablew | ||
mov byte[tablew+2*2], ah ; "0xff" -> 5th B of tablew | mov byte[tablew+2*2], ah ; "0xff" -> 5th B of tablew | ||
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;; using a double word | ;; using a double word | ||
mov eax, dword[tableb+3] ; "5", "0x0a", "01" -> eax | mov eax, dword[tableb+3] ; "5", "0x0a", "01" -> eax | ||
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mov byte[tabled], al ; "1" -> 1st B of tabled | mov byte[tabled], al ; "1" -> 1st B of tabled | ||
mov byte[tabled+1*4], ah ; "10" -> 4th B of tabled | mov byte[tabled+1*4], ah ; "10" -> 4th B of tabled | ||
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;; using a byte | ;; using a byte | ||
mov ah, byte[tableb+2] ; "ff" -> ah | mov ah, byte[tableb+2] ; "ff" -> ah | ||
mov byte[tabled+2*4], ah ; ah -> 8th B of tabled | mov byte[tabled+2*4], ah ; ah -> 8th B of tabled | ||
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;; using a word | ;; using a word | ||
mov ax, word[tableb+3] ; "5" and "0a" -> ax | mov ax, word[tableb+3] ; "5" and "0a" -> ax | ||
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mov ax, word[tabled] ; 0001 -> ax | mov ax, word[tabled] ; 0001 -> ax | ||
mov byte[tableb], al ; 01 -> 1st B of tableb | mov byte[tableb], al ; 01 -> 1st B of tableb | ||
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;; move 02 into [tableb+1] | ;; move 02 into [tableb+1] | ||
mov ax, word[tabled+4] ; 0002 -> ax | mov ax, word[tabled+4] ; 0002 -> ax | ||
mov byte[tableb+1], al ; 02 -> 2nd B of tableb | mov byte[tableb+1], al ; 02 -> 2nd B of tableb | ||
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;; move 255 into [tableb+2] | ;; move 255 into [tableb+2] | ||
mov ax, word[tabled+8] ; 00ff (hex of 255) -> ax | mov ax, word[tabled+8] ; 00ff (hex of 255) -> ax | ||
mov byte[tableb+2], al ; 00ff -> 3rd B of tableb | mov byte[tableb+2], al ; 00ff -> 3rd B of tableb | ||
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;; move 256 into [tableb+3] | ;; move 256 into [tableb+3] | ||
mov ax, word[tabled+12] ; move 0100 (hex of 256) -> ax | mov ax, word[tabled+12] ; move 0100 (hex of 256) -> ax | ||
mov byte[tableb+3], al ; move 00 -> 4th B of tableb | mov byte[tableb+3], al ; move 00 -> 4th B of tableb | ||
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;; move 5678 into [tableb+4] | ;; move 5678 into [tableb+4] | ||
mov ax, word[tabled+16] ; 5678 -> ax | mov ax, word[tabled+16] ; 5678 -> ax | ||
mov byte[tableb+4], al ; 78 -> 5th B of tableb | mov byte[tableb+4], al ; 78 -> 5th B of tableb | ||
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;; move 4321 into [tableb+5] | ;; move 4321 into [tableb+5] | ||
mov ax, word[tabled+20] ; 4321 -> ax | mov ax, word[tabled+20] ; 4321 -> ax | ||
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int 0x80 ; final system call | int 0x80 ; final system call | ||
</pre></code> | </pre></code> | ||
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<br /> | <br /> | ||
<br /> | <br /> | ||
Latest revision as of 12:20, 14 December 2010
--D. Thiebaut 14:18, 15 October 2010 (UTC)
