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Pinpointing Interrupts in Embedded Real-Time Systems using Context Checksums
Publication Type:
Conference/Workshop Paper
Venue:
Proceedings of the 13th International Conference on Emerging Technologies and Factory Automation (ETFA-2008)
Abstract
When trying to track down bugs using cyclic debugging,
the ability to correctly reproduce executions is imperative.
In sequential, deterministic, non-real-time software, this reproducibility
is inherent. However, when the execution is
affected by preemptive interrupts, this will have severe effects
on the ability to reproduce program behaviors deterministically,
since a reproduction requires the interrupts to
hit the program at the exact same instructions. In previous
methods, this problem has been solved using different
kinds of instruction counters, that induce large execution
time perturbations, demand for specialized hardware, or
provide inexact results. This makes them highly unfit for
resource-constrained embedded real-time systems.
In this paper, we propose an alternative method for pinpointing
interrupts in embedded real-time systems using
context checksums, which is not dependent on specific hardware
features or special compilers - but which rather can
be applied to any system. Although context checksums in
some cases also prove inexact or ambiguous, we will show
that they serve as a practical method for pinpointing and
reproducing interrupts in embedded real-time systems. Furthermore,
our method performs perfectly well with standard
development tools and operating systems, requires no additional
hardware support and, according to preliminary results,
consumes merely a tenth of the execution time of existing
software-based methods for pinpointing interrupts.
Bibtex
@inproceedings{Sundmark1294,
author = {Daniel Sundmark and Henrik Thane},
title = {Pinpointing Interrupts in Embedded Real-Time Systems using Context Checksums},
month = {September},
year = {2008},
booktitle = {Proceedings of the 13th International Conference on Emerging Technologies and Factory Automation (ETFA-2008)},
publisher = {IEEE},
url = {http://www.es.mdu.se/publications/1294-}
}