Methods and devices for unwinding stack of frozen program and fo

Details Methods and devices for unwinding stack of frozen program and fo Methods and devices for unwinding stack of frozen program and fo

1997-09-26

1999-12-28

Teska, Kevin J.

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

395704, 714 15, 714 34, 714 38, 712227, G06F 1100

Patent

active

060092580

ABSTRACT:
StackTrace refers generally here to an apparatus and computer method for use with multitasking operating systems (OS's) such as WINDOWS.RTM.95. StackTrace allows a program to again become responsive to OS messages after the program freezes. A user can then save work which was not yet saved at the time the program froze. In one mode, StackTrace identifies a special signature that appears in the virtual stacks of certain kinds of programs. This special signature is a consistently-used return address to a standard-for-type calling function of the OS. StackTrace locates the special signature in the virtual stack of the frozen program and then changes values stored in context registers of the frozen program to cause a return through the in-stack signature location as would have happened if the halted program function had successfully completed. StackTrace then initiates multitasked processing of the program so that the program will return by using the in-stack signature location. This enables the program to become responsive to messages from the OS.

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patent: 5819022 (1998-10-01), Bandat

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