Before we go modifying it further let's add some comments and output clarifications explaining what this test is actually doing.
Signed-off-by: Mark Brown broonie@kernel.org --- tools/testing/selftests/arm64/fp/sve-ptrace.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c index d2ec48f649f9..fc4a672825eb 100644 --- a/tools/testing/selftests/arm64/fp/sve-ptrace.c +++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c @@ -181,6 +181,7 @@ static int do_parent(pid_t child) } }
+ /* New process should start with FPSIMD registers only */ sve = get_sve(pid, &svebuf, &svebufsz); if (!sve) { int e = errno; @@ -191,14 +192,15 @@ static int do_parent(pid_t child)
goto error; } else { - ksft_test_result_pass("get_sve\n"); + ksft_test_result_pass("get_sve(FPSIMD)\n"); }
ksft_test_result((sve->flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_FPSIMD, - "FPSIMD registers\n"); + "Set FPSIMD registers\n"); if ((sve->flags & SVE_PT_REGS_MASK) != SVE_PT_REGS_FPSIMD) goto error;
+ /* 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) { @@ -219,6 +221,7 @@ static int do_parent(pid_t child) goto error; }
+ /* Zero the first SVE Z register */ vq = sve_vq_from_vl(sve->vl);
newsvebufsz = SVE_PT_SVE_ZREG_OFFSET(vq, 1); @@ -245,6 +248,7 @@ static int do_parent(pid_t child) goto error; }
+ /* Try to read back the value we just set */ new_sve = get_sve(pid, &newsvebuf, &newsvebufsz); if (!new_sve) { int e = errno; @@ -257,12 +261,13 @@ static int do_parent(pid_t child) }
ksft_test_result((new_sve->flags & SVE_PT_REGS_MASK) == SVE_PT_REGS_SVE, - "SVE registers\n"); + "Get SVE registers\n"); if ((new_sve->flags & SVE_PT_REGS_MASK) != SVE_PT_REGS_SVE) goto error;
dump_sve_regs(new_sve, 3, sizeof fpsimd->vregs[0]);
+ /* Verify that the register we set has the value we expected */ p = (unsigned char *)new_sve + SVE_PT_SVE_ZREG_OFFSET(vq, 1); for (i = 0; i < sizeof fpsimd->vregs[0]; ++i) { unsigned char expected = i;