Difference between revisions of "CSC231 Homwork 2 Solution 2010"
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| + | <onlysmith> | ||
=Number Systems= | =Number Systems= | ||
<code><pre> | <code><pre> | ||
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</pre></code> | </pre></code> | ||
| + | ==Testing the Mystery Program== | ||
<br /> | <br /> | ||
| + | * To test the programs, the hexadecimal dump of the object file of the original program was compared to the hexadecimal dump of the object file of your version. | ||
| + | * Assume that hw2_mystery.solution.asm is the orginal that you have to recreate, and assume that hw2c.asm is your program: | ||
| + | |||
| + | nasm -f elf hw2c.asm | ||
| + | hexdump -C hw2c.o | tail -190 | head -40 > hw2c.lst | ||
| + | |||
| + | nasm -f elf hw2_mystery.solution.asm | ||
| + | hexdump -C hw2_mystery.solution.o | tail -190 | head -40 > hw2_mystery.solution.lst | ||
| + | |||
| + | diff -y hw2_mystery.solution.lst hw2c.lst | ||
| + | |||
| + | * The output is shown below. When only 1 vertical bar separates the two columns, then the program on the left matches the program on the right. When double vertical bars appear, there is a difference between the two programs. Visual inspection will indicate where the problem bytes are... | ||
| + | |||
| + | 000001f0 04 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 | 000001f0 04 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 | | ||
| + | 00000200 20 6d 61 6b 65 73 20 70 65 72 66 65 63 74 2e 2e | 00000200 20 6d 61 6b 65 73 20 70 65 72 66 65 63 74 2e 2e | | ||
| + | 00000210 2e 70 72 61 63 74 69 63 65 62 75 74 20 6e 6f 62 | 00000210 2e 70 72 61 63 74 69 63 65 62 75 74 20 6e 6f 62 | | ||
| + | 00000220 6f 64 79 27 73 20 73 6f 20 77 68 79 20 3f 0a 0a | 00000220 6f 64 79 27 73 20 73 6f 20 77 68 79 20 3f 0a 0a | | ||
| + | 00000230 b8 04 00 00 00 bb 01 00 00 00 b9 11 00 00 00 ba | 00000230 b8 04 00 00 00 bb 01 00 00 00 b9 11 00 00 00 ba | | ||
| + | 00000240 08 00 00 00 cd 80 b8 ff ff ff ff b8 04 00 00 00 | | 00000240 08 00 00 00 cd 80 b8 04 00 00 00 bb 01 00 00 00 | | ||
| + | 00000250 bb 01 00 00 00 b9 07 00 00 00 b9 00 00 00 00 ba | | 00000250 b9 07 00 00 00 b9 00 00 00 00 ba 10 00 00 00 cd | | ||
| + | 00000260 07 00 00 00 cd 80 ba 11 00 00 00 b8 01 00 00 00 | | 00000260 80 ba 11 00 00 00 b8 01 00 00 00 b8 04 00 00 00 | | ||
| + | 00000270 b8 04 00 00 00 bb 01 00 00 00 b9 07 00 00 00 ba | | 00000270 bb 01 00 00 00 b9 07 00 00 00 ba 0a 00 00 00 cd | | ||
| + | 00000280 0a 00 00 00 cd 80 b8 04 00 00 00 bb 01 00 00 00 | | 00000280 80 b8 04 00 00 00 bb 01 00 00 00 b9 19 00 00 00 | | ||
| + | 00000290 b9 19 00 00 00 ba 0d 00 00 00 cd 80 b8 04 00 00 | | 00000290 ba 0d 00 00 00 cd 80 b8 04 00 00 00 bb 01 00 00 | | ||
| + | 000002a0 00 bb 01 00 00 00 b9 06 00 00 00 ba 0a 00 00 00 | | 000002a0 00 b9 06 00 00 00 ba 0a 00 00 00 41 cd 80 b8 04 | | ||
| + | 000002b0 41 cd 80 b8 04 00 00 00 bb 01 00 00 00 b9 24 00 | | 000002b0 00 00 00 bb 01 00 00 00 b9 24 00 00 00 41 ba 07 | | ||
| + | 000002c0 00 00 41 ba 07 00 00 00 41 cd 80 b8 04 00 00 00 | | 000002c0 00 00 00 41 cd 80 b8 04 00 00 00 bb 01 00 00 00 | | ||
| + | 000002d0 bb 01 00 00 00 b9 11 00 00 00 ba 08 00 00 00 cd | | 000002d0 b9 0e 00 00 00 ba 0b 00 00 00 cd 80 b8 04 00 00 | | ||
| + | 000002e0 80 b8 04 00 00 00 bb 01 00 00 00 b9 2d 00 00 00 | | 000002e0 00 bb 01 00 00 00 b9 2d 00 00 00 ba 03 00 00 00 | | ||
| + | 000002f0 ba 03 00 00 00 cd 80 b8 01 00 00 00 bb 00 00 00 | | 000002f0 cd 80 b8 01 00 00 00 bb 00 00 00 00 cd 80 00 00 | | ||
| + | 00000300 00 cd 80 00 00 00 00 00 00 00 00 00 00 00 00 00 | | 00000300 00 54 68 65 20 4e 65 74 77 69 64 65 20 41 73 73 | | ||
| + | |||
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<br /> | <br /> | ||
| + | </onlysmith> | ||
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Latest revision as of 12:21, 14 December 2010
--D. Thiebaut 21:35, 6 October 2010 (UTC)
