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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c')
-rw-r--r-- | tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c b/tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c new file mode 100644 index 000000000..db4e8c680 --- /dev/null +++ b/tools/testing/selftests/powerpc/alignment/copy_first_unaligned.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2016, Chris Smart, IBM Corporation. + * + * Calls to copy_first which are not 128-byte aligned should be + * caught and sent a SIGBUS. + */ + +#include <signal.h> +#include <string.h> +#include <unistd.h> +#include "utils.h" +#include "instructions.h" + +unsigned int expected_instruction = PPC_INST_COPY_FIRST; +unsigned int instruction_mask = 0xfc2007fe; + +void signal_action_handler(int signal_num, siginfo_t *info, void *ptr) +{ + ucontext_t *ctx = ptr; +#ifdef __powerpc64__ + unsigned int *pc = (unsigned int *)ctx->uc_mcontext.gp_regs[PT_NIP]; +#else + unsigned int *pc = (unsigned int *)ctx->uc_mcontext.uc_regs->gregs[PT_NIP]; +#endif + + /* + * Check that the signal was on the correct instruction, using a + * mask because the compiler assigns the register at RB. + */ + if ((*pc & instruction_mask) == expected_instruction) + _exit(0); /* We hit the right instruction */ + + _exit(1); +} + +void setup_signal_handler(void) +{ + struct sigaction signal_action; + + memset(&signal_action, 0, sizeof(signal_action)); + signal_action.sa_sigaction = signal_action_handler; + signal_action.sa_flags = SA_SIGINFO; + sigaction(SIGBUS, &signal_action, NULL); +} + +char cacheline_buf[128] __cacheline_aligned; + +int test_copy_first_unaligned(void) +{ + /* Only run this test on a P9 or later */ + SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00)); + + /* Register our signal handler with SIGBUS */ + setup_signal_handler(); + + /* +1 makes buf unaligned */ + copy_first(cacheline_buf+1); + + /* We should not get here */ + return 1; +} + +int main(int argc, char *argv[]) +{ + return test_harness(test_copy_first_unaligned, "test_copy_first_unaligned"); +} |