The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 1986
Filed:
Jun. 29, 1983
Peter H Gum, Poughkeepsie, NY (US);
Arthur L Levin, Pleasant Valley, NY (US);
Ronald M Smith, Wappingers Falls, NY (US);
John H Wilson, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The disclosure describes a separate trace table for each CPU in an MP to avoid inter-CPU interference in making trace table entries for explicit and implicit tracing instructions enabled by flag bits in a control register (CR). Explicit tracing entries are made for an enabled explicit tracing instruction. Implicit tracing entries are made for predetermined instructions (when enabled for tracing) which do not have tracing as their primary purpose. A storage operand of the trace instruction contains a disablement field and optionally may contain an enablement-controlling class field to improve the integrity of traceable programs. A time stamp and range of general register contents is provided in each trace table entry for a tracing instruction. The time stamp enables all trace tables in an MP system to be later merged into a single trace table whenever required.