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| author | Mark Brown <broonie@kernel.org> | 2021-09-13 15:55:01 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-09-29 16:40:32 +0300 |
| commit | 736e6d5a54511e1438cb81d38e5d9f164eb2af1a (patch) | |
| tree | f2adb51133dc434238af3d5cf4d87ffc7be9a626 /tools/testing/selftests/arm64/fp | |
| parent | eab281e3afa6a740df9b9c2e313eb4a9944deeea (diff) | |
| download | linux-736e6d5a54511e1438cb81d38e5d9f164eb2af1a.tar.xz | |
selftests: arm64: Document what the SVE ptrace test is doing
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>
Link: https://lore.kernel.org/r/20210913125505.52619-5-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'tools/testing/selftests/arm64/fp')
| -rw-r--r-- | tools/testing/selftests/arm64/fp/sve-ptrace.c | 11 |
1 files 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; |