Currently we test signal delivery to the programs run by fp-stress but our signal handlers simply count the number of signals seen and don't do anything with the floating point state. The original fpsimd-test and sve-test programs had signal handlers called irritators which modify the live register state, verifying that we restore the signal context on return, but a combination of misleading comments and code resulted in them never being used and the equivalent handlers in the other tests being stubbed or omitted. Clarify the code, implement effective irritator handlers for the test programs that can have them and then switch the signals generated by the fp-stress program over to use the irritators, ensuring that we validate that we restore the saved signal context properly. Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- Changes in v2: - Change instruction and commit log for corruption of predicat registers. - Link to v1: https://lore.kernel.org/r/20241023-arm64-fp-stress-irritator-v1-0-a51af298d449@xxxxxxxxxx --- Mark Brown (6): kselftest/arm64: Correct misleading comments on fp-stress irritators kselftest/arm64: Remove unused ADRs from irritator handlers kselftest/arm64: Corrupt P0 in the irritator when testing SSVE kselftest/arm64: Implement irritators for ZA and ZT kselftest/arm64: Provide a SIGUSR1 handler in the kernel mode FP stress test kselftest/arm64: Test signal handler state modification in fp-stress tools/testing/selftests/arm64/fp/fp-stress.c | 2 +- tools/testing/selftests/arm64/fp/fpsimd-test.S | 4 +--- tools/testing/selftests/arm64/fp/kernel-test.c | 4 ++++ tools/testing/selftests/arm64/fp/sve-test.S | 8 +++----- tools/testing/selftests/arm64/fp/za-test.S | 13 ++++--------- tools/testing/selftests/arm64/fp/zt-test.S | 13 ++++--------- 6 files changed, 17 insertions(+), 27 deletions(-) --- base-commit: 8e929cb546ee42c9a61d24fae60605e9e3192354 change-id: 20241023-arm64-fp-stress-irritator-5415fe92adef Best regards, -- Mark Brown <broonie@xxxxxxxxxx>
