Carnegie mellon 52 bryant and ohallaron computer

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Carnegie Mellon 52 Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition What Can be Disassembled? Anything that can be interpreted as executable code Disassembler examines bytes and reconstructs assembly source % objdump -d WINWORD.EXE WINWORD.EXE: file format pei-i386 No symbols in "WINWORD.EXE". Disassembly of section .text: 30001000 <.text>: 30001000: 55 push %ebp 30001001: 30001003: 30001005: 3000100a: Reverse engineering forbidden by Microsoft End User License Agreement
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Carnegie Mellon 53 Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition Machine Programming I: Summary History of Intel processors and architectures Evolutionary design leads to many quirks and artifacts C, assembly, machine code New forms of visible state: program counter, registers, ... Compiler must transform statements, expressions, procedures into low-level instruction sequences Assembly Basics: Registers, operands, move The x86-64 move instructions cover wide range of data movement forms Arithmetic C compiler will figure out different instruction combinations to carry out computation
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