Added a simple mangle testcase which messes with the ucontext_t from within the sig_handler, trying to toggle PSTATE SSBS bit. Expect SIGILL if SSBS feature unsupported or that the value set in PSTATE.SSBS is preserved on test PASS.
Signed-off-by: Cristian Marussi cristian.marussi@arm.com --- .../arm64/signal/testcases/.gitignore | 1 + .../testcases/mangle_pstate_ssbs_regs.c | 41 +++++++++++++++++++ 2 files changed, 42 insertions(+) create mode 100644 tools/testing/selftests/arm64/signal/testcases/mangle_pstate_ssbs_regs.c
diff --git a/tools/testing/selftests/arm64/signal/testcases/.gitignore b/tools/testing/selftests/arm64/signal/testcases/.gitignore index e7a1d998b650..c2972c3f33ca 100644 --- a/tools/testing/selftests/arm64/signal/testcases/.gitignore +++ b/tools/testing/selftests/arm64/signal/testcases/.gitignore @@ -5,3 +5,4 @@ mangle_pstate_invalid_state_toggle mangle_pstate_invalid_mode_el1 mangle_pstate_invalid_mode_el2 mangle_pstate_invalid_mode_el3 +mangle_pstate_ssbs_regs diff --git a/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_ssbs_regs.c b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_ssbs_regs.c new file mode 100644 index 000000000000..d997ebf742d9 --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_ssbs_regs.c @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2019 ARM Limited */ + +#include "test_signals_utils.h" +#include "testcases.h" + +static int mangle_invalid_pstate_ssbs_run(struct tdescr *td, + siginfo_t *si, ucontext_t *uc) +{ + ASSERT_GOOD_CONTEXT(uc); + + /* toggle bit value */ + uc->uc_mcontext.pstate ^= PSR_SSBS_BIT; + /* Save after mangling...it should be preserved */ + td->saved_uc = *uc; + + return 1; +} + +static int pstate_ssbs_bit_checks(struct tdescr *td) +{ + uint64_t val = 0; + + get_regval(MRS_SSBS_SYSREG, val); + /* pass when preserved */ + td->pass = (!!(val & MRS_SSBS_BIT) == + !!(td->saved_uc.uc_mcontext.pstate & PSR_SSBS_BIT)); + + return 1; +} + +struct tdescr tde = { + .sanity_disabled = true, + .name = "MANGLE_PSTATE_SSBS_REGS", + .descr = "Mangling uc_mcontext changing SSBS.(PRESERVE)", + .feats_required = FEAT_SSBS, + .sig_trig = SIGUSR1, + .sig_unsupp = SIGILL, + .run = mangle_invalid_pstate_ssbs_run, + .check_result = pstate_ssbs_bit_checks, +};