{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11243769","patent":{"patent_number":"US-11243769","title":"Shadow stack ISA extensions to support fast return and event delivery (FRED) architecture","assignee":null,"inventors":[],"filing_date":"2020-03-28T00:00:00.000Z","publication_date":"2022-02-08T00:00:00.000Z","cpc_codes":["G06F","G06F","G06F","G06F","G06F"],"num_claims":25,"abstract":"An apparatus and method for efficiently managing shadow stacks. For example, one embodiment of a processor comprises: a plurality of registers to store a plurality of shadow stack pointers (SSPs), each SSP associated with a different event priority; event processing circuitry to select a first SSP of the plurality of SSPs from a first register of the plurality of registers responsive to receipt of a first event associated with a first event priority level, the first SSP usable to identify a top of a first shadow stack; verification and utilization checking circuitry to determine whether the first SSP has been previously verified, wherein if the first SSP has not been previously verified then initiating a set of atomic operations to verify the first SSP and confirm that the first SSP is not in use, the set of atomic operations using a locking operation to lock data until the set of atomic operations are complete, and wherein if the first SSP has been previously verified, then re-verifying the first SSP and confirming that the first SSP is not in use without using the locking operation."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Shadow stack ISA extensions to support fast return and event delivery (FRED) architecture","description":"An apparatus and method for efficiently managing shadow stacks. For example, one embodiment of a processor comprises: a plurality of registers to store a plurality of shadow stack pointers (SSPs), eac","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11243769","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-11243769","citation_suggestion":"Patentable. \"Shadow stack ISA extensions to support fast return and event delivery (FRED) architecture\" (US-11243769). https://patentable.app/patents/US-11243769","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11243769","json":"https://patentable.app/api/llm-context/US-11243769","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T23:03:37.217Z"}