{"id":156931,"date":"2004-02-01T00:00:00","date_gmt":"2004-02-01T00:00:00","guid":{"rendered":"https:\/\/new-cm-edgedigital.pages.dev\/en-us\/research\/msr-research-item\/a-low-level-typed-assembly-language-with-a-machine-checkable-soundness-proof\/"},"modified":"2018-10-16T20:26:21","modified_gmt":"2018-10-17T03:26:21","slug":"a-low-level-typed-assembly-language-with-a-machine-checkable-soundness-proof","status":"publish","type":"msr-research-item","link":"https:\/\/new-cm-edgedigital.pages.dev\/en-us\/research\/publication\/a-low-level-typed-assembly-language-with-a-machine-checkable-soundness-proof\/","title":{"rendered":"A Low-Level Typed Assembly Language with a Machine-Checkable Soundness Proof"},"content":{"rendered":"<div class=\"asset-content\">\n<p>To reason about mobile machine code safety, Proof-Carrying Code framework requires machine code accompanied by a proof of safety. Typed assembly languages provide a way to automatically generate such safety proofs. But the soundness proofs of most existing typed assembly languages are hand-written and cannot be machine-checked, which is worrisome for such large calculi. In this dissertation I will explain a low-level typed assembly language (LTAL) with a semantic model that proves LTAL&#8217;s soundness with a machine-checkable proof. Compared to existing typed assembly languages, LTAL is more scalable and more secure; it has no macro instructions that hinder low-level optimizations such as instruction scheduling; its type constructors are expressive enough to capture dataflow information, support the compiler&#8217;s choice of data representations and permit typed position-independent code; and its typed-checking algorithm is completely syntax-directed.<\/p>\n<p>I will also explain a prototype system that uses LTAL to compile core ML to Sparc code and generate safety proofs. I will show how we were able to build type-preserving back end based on an untyped one, without restricting low-level optimizations and without knowledge of any type system pervading the instruction and selector and register allocator.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>To reason about mobile machine code safety, Proof-Carrying Code framework requires machine code accompanied by a proof of safety. Typed assembly languages provide a way to automatically generate such safety proofs. But the soundness proofs of most existing typed assembly languages are hand-written and cannot be machine-checked, which is worrisome for such large calculi. In 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