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Code

kselftest/arm64: Test FPSIMD format data writes via NT_ARM_SVE in fp-ptrace

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The NT_ARM_SVE register set supports two data formats, the native SVE one
and an alternative format where we embed a copy of user_fpsimd_data as used
for NT_PRFPREG in the SVE register set. The register data is set as for a
write to NT_PRFPREG and changes in vector length and streaming mode are
handled as for any NT_ARM_SVE write. This has not previously been tested by
fp-ptrace, add coverage of it.

We do not support writes in FPSIMD format for NT_ARM_SSVE so we skip the
test for anything that would leave us in streaming mode.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250718-arm64-fp-ptrace-sve-fpsimd-v1-1-7ecda32aa297@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2025-07-18 23:03:26 +01:00 committed by Catalin Marinas
parent b5cebb5de9
commit b84d2b2795
1 changed files with 64 additions and 2 deletions
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66
tools/testing/selftests/arm64/fp/fp-ptrace.c
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@ -1066,6 +1066,23 @@ static bool sve_write_supported(struct test_config *config)
return true;
}
static bool sve_write_fpsimd_supported(struct test_config *config)
{
if (!sve_supported())
return false;
if ((config->svcr_in & SVCR_ZA) != (config->svcr_expected & SVCR_ZA))
return false;
if (config->svcr_expected & SVCR_SM)
return false;
if (config->sme_vl_in != config->sme_vl_expected)
return false;
return true;
}
static void fpsimd_write_expected(struct test_config *config)
{
int vl;
@ -1152,7 +1169,7 @@ static void sve_write_expected(struct test_config *config)
}
}
static void sve_write(pid_t child, struct test_config *config)
static void sve_write_sve(pid_t child, struct test_config *config)
{
struct user_sve_header *sve;
struct iovec iov;
@ -1195,6 +1212,45 @@ static void sve_write(pid_t child, struct test_config *config)
free(iov.iov_base);
}
static void sve_write_fpsimd(pid_t child, struct test_config *config)
{
struct user_sve_header *sve;
struct user_fpsimd_state *fpsimd;
struct iovec iov;
int ret, vl, vq;
vl = vl_expected(config);
vq = __sve_vq_from_vl(vl);
if (!vl)
return;
iov.iov_len = SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq,
SVE_PT_REGS_FPSIMD);
iov.iov_base = malloc(iov.iov_len);
if (!iov.iov_base) {
ksft_print_msg("Failed allocating %lu byte SVE write buffer\n",
iov.iov_len);
return;
}
memset(iov.iov_base, 0, iov.iov_len);
sve = iov.iov_base;
sve->size = iov.iov_len;
sve->flags = SVE_PT_REGS_FPSIMD;
sve->vl = vl;
fpsimd = iov.iov_base + SVE_PT_REGS_OFFSET;
memcpy(&fpsimd->vregs, v_expected, sizeof(v_expected));
ret = ptrace(PTRACE_SETREGSET, child, NT_ARM_SVE, &iov);
if (ret != 0)
ksft_print_msg("Failed to write SVE: %s (%d)\n",
strerror(errno), errno);
free(iov.iov_base);
}
static bool za_write_supported(struct test_config *config)
{
if ((config->svcr_in & SVCR_SM) != (config->svcr_expected & SVCR_SM))
@ -1386,7 +1442,13 @@ static struct test_definition sve_test_defs[] = {
.name = "SVE write",
.supported = sve_write_supported,
.set_expected_values = sve_write_expected,
.modify_values = sve_write,
.modify_values = sve_write_sve,
},
{
.name = "SVE write FPSIMD format",
.supported = sve_write_fpsimd_supported,
.set_expected_values = fpsimd_write_expected,
.modify_values = sve_write_fpsimd,
},
};