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kselftst/arm64: Test NT_ARM_SVE FPSIMD format writes on non-SVE systems

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In order to allow exiting streaming mode on systems with SME but not SVE
we allow writes of FPSIMD format data via NT_ARM_SVE even when SVE is not
supported, add a test case that covers this to sve-ptrace.

We do not support reads.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2025-10-15 18:56:37 +01:00
committed by Catalin Marinas
parent 472800cd5e
commit eb9df6d69a
1 changed files with 61 additions and 0 deletions
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61
tools/testing/selftests/arm64/fp/sve-ptrace.c
View File

@@ -394,6 +394,58 @@ static void ptrace_sve_fpsimd(pid_t child, const struct vec_type *type)
free(svebuf);
}
/* Write the FPSIMD registers via the SVE regset when SVE is not supported */
static void ptrace_sve_fpsimd_no_sve(pid_t child)
{
void *svebuf;
struct user_sve_header *sve;
struct user_fpsimd_state *fpsimd, new_fpsimd;
unsigned int i, j;
unsigned char *p;
int ret;
svebuf = malloc(SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
if (!svebuf) {
ksft_test_result_fail("Failed to allocate FPSIMD buffer\n");
return;
}
/* On a system without SVE the VL should be set to 0 */
memset(svebuf, 0, SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
sve = svebuf;
sve->flags = SVE_PT_REGS_FPSIMD;
sve->size = SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD);
sve->vl = 0;
/* Try to set a known FPSIMD state via PT_REGS_SVE */
fpsimd = (struct user_fpsimd_state *)((char *)sve +
SVE_PT_FPSIMD_OFFSET);
for (i = 0; i < 32; ++i) {
p = (unsigned char *)&fpsimd->vregs[i];
for (j = 0; j < sizeof(fpsimd->vregs[i]); ++j)
p[j] = j;
}
ret = set_sve(child, &vec_types[0], sve);
ksft_test_result(ret == 0, "FPSIMD write via SVE\n");
if (ret) {
ksft_test_result_skip("Verify FPSIMD write via SVE\n");
goto out;
}
/* Verify via the FPSIMD regset */
if (get_fpsimd(child, &new_fpsimd)) {
ksft_test_result_skip("Verify FPSIMD write via SVE\n");
goto out;
}
ksft_test_result(memcmp(fpsimd, &new_fpsimd, sizeof(*fpsimd)) == 0,
"Verify FPSIMD write via SVE\n");
out:
free(svebuf);
}
/* Validate attempting to set SVE data and read SVE data */
static void ptrace_set_sve_get_sve_data(pid_t child,
const struct vec_type *type,
@@ -826,6 +878,15 @@ static int do_parent(pid_t child)
}
}
/* We support SVE writes of FPSMID format on SME only systems */
if (!(getauxval(AT_HWCAP) & HWCAP_SVE) &&
(getauxval(AT_HWCAP2) & HWCAP2_SME)) {
ptrace_sve_fpsimd_no_sve(child);
} else {
ksft_test_result_skip("FPSIMD write via SVE\n");
ksft_test_result_skip("Verify FPSIMD write via SVE\n");
}
ret = EXIT_SUCCESS;
error: