Add trace library
Add a library which supports tracing of execution using built-in gcc
features and a microsecond timer. This can be used to record a list of
function which are executed, along with a timestamp for each. Later
this information can be sent to the host for processing.
Signed-off-by: NSimon Glass <sjg@chromium.org>
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doc/README.trace
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include/trace.h
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lib/trace.c
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