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    <pre><code>mov -0x24(%ebp,%eax,4),%eax </code></pre> <p>The above instruction is accessing an element of an array. This is called <code>SIB</code> addressing in x86, for Scale, Index, Base. There is also an Offset component. The array is based at an address determined by the Base register (<code>EBP</code> here) plus an offset (when using a frame pointer, local variables, including arrays, are addressed as an offset from the frame pointer). The element number is at the Index register (<code>EAX</code> here). The size of each element is determined by the Scale (<code>4</code> here). </p> <pre><code>mov 0x804a6d8,%eax mov $0xffffffff,%ecx mov %eax,-0x2c(%ebp) mov $0x0,%eax cld mov -0x2c(%ebp),%edi repnz scas %es:(%edi),%al mov %ecx,%eax not %eax sub $0x1,%eax </code></pre> <p>This is just <code>strlen(0x805a6d8)</code>. <code>ES:EDI</code> points to a string to scan (compare agains a reference byte) at <code>0x804a6d8</code>. <code>AL</code> contains the character to scan for: <code>0</code> - <code>ASCII NUL</code>. <code>cld</code> sets the direction for the scan: ascending (<code>std</code> would make the scan descending). <code>ECX</code> is initialized to <code>~0 = -1</code>: all bits 1. <code>repnz</code> repeats the <code>scas</code> (SCAN STRING) instruction decrementing <code>ECX</code> while <code>ECX</code> is not zero (which will not happen since ECX is big enough to prevent that) and the scan is not successful (NZ, while the scan (compare between the string and the reference AL) didn't set the zero flag). After that, <code>ECX</code> contains <code>-1-(steps in the scan)</code>. <code>NOT</code> makes that <code>(steps in the scan)</code>. <code>SUB</code> makes that <code>(steps in the scan) - 1 = (length of string not including the terminating NUL)</code>. Also explained at <a href="http://www.int80h.org/strlen/" rel="noreferrer">http://www.int80h.org/strlen/</a>.</p>
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    1. COWow, thanks. This is very useful. Thank you very much!
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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