October 2018
Beginner to intermediate
436 pages
9h 36m
English
Content preview from Mastering Reverse Engineering
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Copying data
The MOV instruction is used to move data. With this, data is moved either to or from a register or a memory address.
mov eax, 0xaabbccdd places the 0xaabbccdd value in the eax register.
mov eax, edx places the data value from theedx register to the eax register.
Let's take the following memory entries as an example:
Address Bytes00000060: 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 00000070: 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F 00000080: 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 00000090: 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
Reading data may require using directives to help the assembler. We use byte ptr, word ptr, or dword ptr:
; the following lines reads from memorymov al, byte ptr [00000071 ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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