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:
Apr. 16, 2013
Filed:
Aug. 12, 2009
Gideon M. Myles, San Jose, CA (US);
Julien Lerouge, Santa Clara, CA (US);
Tanya Michelle Lattner, San Jose, CA (US);
Augustin J. Farrugia, Cupertino, CA (US);
Gideon M. Myles, San Jose, CA (US);
Julien Lerouge, Santa Clara, CA (US);
Tanya Michelle Lattner, San Jose, CA (US);
Augustin J. Farrugia, Cupertino, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Disclosed herein are systems, computer-implemented methods, and computer-readable storage media for obfuscating a function call. The method receives a computer program having an annotated function and determines prolog instructions for setting up a stack frame of the annotated function and epilog instructions for tearing down the stack frame. The method places a first portion of the prolog instructions in the computer program preceding a jump to the annotated function and a second portion of the prolog instructions at a beginning of the annotated function. The method places a first portion of the epilog instructions at an end of the annotated function and a second portion of the epilog instructions in the computer program after the jump. Executing the first and second portions of the prolog instructions together sets up the stack frame. Executing the first and the second portions of the epilog instructions together tears down the stack frame.