Restartable sequences: self-tests
Implements two basic tests of RSEQ functionality, and one more
exhaustive parameterizable test.
The first, "basic_test" only asserts that RSEQ works moderately
correctly.
E.g. that:
- The CPUID pointer works
- Code infinitely looping within a critical section will eventually be
interrupted.
- Critical sections are interrupted by signals.
"basic_percpu_ops_test" is a slightly more "realistic" variant,
implementing a few simple per-cpu operations and testing their
correctness.
"param_test" is a parametrizable restartable sequences test. See
the "--help" output for usage.
As part of those tests, a helper library "rseq" implements a user-space
API around restartable sequences. It takes care of ensuring progress in
case of debugger single-stepping with a fall-back to locking, and
exposes the instruction pointer addresses where the rseq assembly blocks
begin and end, as well as the associated abort instruction pointer, in
the __rseq_table section. This section allows debuggers may know where
to place breakpoints when single-stepping through assembly blocks which
may be aborted at any point by the kernel.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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