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Category Archives: Assembly
Some Assembly Required No. 1
I’ve been working on some of the instruction tests in vial, and I wanted to test the implementation of LOOP variants. My objective was to make sure the vial version is identical to the real CPU version (as discussed here). … Continue reading
Posted in Assembly, Challenges, Programming, Testing
Tagged Assembly, challenge, Testing, vial
2 Comments
First Code Transformation: Removing Flag Computations
Short introduction to code transformations If you intend to write a decompiler, you’ll find yourself writing code transformations. In our context, code transformations are operations that take as input an expression tree, and return an equivalent but different expression tree. … Continue reading
Posted in Algorithms, Assembly, decompilation, Programming
Tagged code transformations, decompilation, Disassembly, Distorm, removing flag computations, vial, VM
1 Comment
Issues in Writing a VM – Part 2
Writing a VM capable of executing expression trees is different from writing a VM for executing assembly instructions. Here I’ll cover several issues stemming from this difference. The first group of issues involve generality. Supporting a specific instruction set is … Continue reading
Posted in Algorithms, Assembly, computer science, Programming, Projects, Python
Tagged delay slot, Disassembly, Distorm, Python generators, vial, VM
7 Comments
Issues in writing a VM – Part 1
Arkon and I decided to write a VM for vial. First though, a short explanation on what is vial: vial is a project aimed at writing a general disassembler that outputs expression trees instead of text. On top of vial, … Continue reading
Posted in Assembly, computer science, Programming, Projects, Testing
Tagged Compilation, Disassembly, Distorm, fuzzing, Testing, vial, VM
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Writing a Quad Interpreter
My compilation homework is writing a compiler from simplified CPL to Quad, a made up assembly language. The compiler was going well, and when it started to emit code, I naturally wanted to test it. The problem is, I work … Continue reading
Posted in Assembly, Compilation, computer science, Personal, Programming, Python
Tagged Compilation, homework, VM
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