Why do we need ud2 when int 6 is right there?
An interrupt is not a fault.
Quick read
A technical explanation of why the ud2 undefined-instruction instruction is needed instead of using an explicit int 6 software interrupt. It shows that faults (like #UD) and traps (like int 6) differ in which instruction address is reported to the handler, and why that difference matters for emulation and correct OS behavior.
- Fault reports point to the faulting instruction; traps point to the next instruction
- Handlers rely on fault semantics to emulate or repair instructions
- User-mode cannot reliably or permissibly invoke int 6 to mimic #UD
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Why do we need ud2 when int 6 is right there? was shared on NexURLs by Nexis on November 2, 2026, in Articles & Stories.
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What is Why do we need ud2 when int 6 is right there??
Why do we need ud2 when int 6 is right there? (devblogs.microsoft.com): A technical explanation of why the ud2 undefined-instruction instruction is needed instead of using an explicit int 6 software interrupt. It shows that faults (like #UD) and traps (like int 6) differ in which instruction address is reported to the handler, and why that difference matters for...
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