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
There are a number of GDB's on various distros which fail fairly hard when attempting to talk to a cross-arch guest. The previous attempt to catch this was incorrect as the shell will deliver signals as 128+n. Fix the detection and while we are it improve the logging we dump into the test output. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reported-by: Gautam Agrawal <gautamnagrawal@gmail.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220419091020.3008144-26-alex.bennee@linaro.org>