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Sat, 25 Oct 2025 14:07:12 -0700 (PDT) From: Sergey Matyukevich To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Oleg Nesterov , Shuah Khan , Thomas Huth , Charlie Jenkins , Andy Chiu , Samuel Holland , Joel Granados , Conor Dooley , Yong-Xuan Wang , Heiko Stuebner , Sergey Matyukevich Subject: [PATCH v3 3/9] selftests: riscv: verify initial vector state with ptrace Date: Sun, 26 Oct 2025 00:06:36 +0300 Message-ID: <20251025210655.43099-4-geomatsi@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251025210655.43099-1-geomatsi@gmail.com> References: <20251025210655.43099-1-geomatsi@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a test case that attaches to a traced process immediately after its first executed vector instructions to verify the initial vector context. Signed-off-by: Sergey Matyukevich --- .../testing/selftests/riscv/vector/v_ptrace.c | 101 ++++++++++++++++++ 1 file changed, 101 insertions(+) diff --git a/tools/testing/selftests/riscv/vector/v_ptrace.c b/tools/testin= g/selftests/riscv/vector/v_ptrace.c index 6a4b5a2ab4a2..9fea29f7b686 100644 --- a/tools/testing/selftests/riscv/vector/v_ptrace.c +++ b/tools/testing/selftests/riscv/vector/v_ptrace.c @@ -82,4 +82,105 @@ TEST(ptrace_v_not_enabled) } } =20 +TEST(ptrace_v_early_debug) +{ + static volatile unsigned long vstart; + static volatile unsigned long vtype; + static volatile unsigned long vlenb; + static volatile unsigned long vcsr; + static volatile unsigned long vl; + pid_t pid; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); + + chld_lock =3D 1; + pid =3D fork(); + ASSERT_LE(0, pid) + TH_LOG("fork: %m"); + + if (pid =3D=3D 0) { + while (chld_lock =3D=3D 1) + asm volatile("" : : "g"(chld_lock) : "memory"); + + asm volatile("csrr %[vstart], vstart" : [vstart] "=3Dr"(vstart)); + asm volatile("csrr %[vl], vl" : [vl] "=3Dr"(vl)); + asm volatile("csrr %[vtype], vtype" : [vtype] "=3Dr"(vtype)); + asm volatile("csrr %[vcsr], vcsr" : [vcsr] "=3Dr"(vcsr)); + asm volatile("csrr %[vlenb], vlenb" : [vlenb] "=3Dr"(vlenb)); + + asm volatile ("ebreak" : : : ); + } else { + struct __riscv_v_regset_state *regset_data; + unsigned long vstart_csr; + unsigned long vlenb_csr; + unsigned long vtype_csr; + unsigned long vcsr_csr; + unsigned long vl_csr; + size_t regset_size; + struct iovec iov; + int status; + + /* attach */ + + ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid, NULL, NULL)); + ASSERT_EQ(pid, waitpid(pid, &status, 0)); + ASSERT_TRUE(WIFSTOPPED(status)); + + /* unlock */ + + ASSERT_EQ(0, ptrace(PTRACE_POKEDATA, pid, &chld_lock, 0)); + + /* resume and wait for ebreak */ + + ASSERT_EQ(0, ptrace(PTRACE_CONT, pid, NULL, NULL)); + ASSERT_EQ(pid, waitpid(pid, &status, 0)); + ASSERT_TRUE(WIFSTOPPED(status)); + + /* read tracee vector csr regs using ptrace PEEKDATA */ + + errno =3D 0; + vstart_csr =3D ptrace(PTRACE_PEEKDATA, pid, &vstart, NULL); + ASSERT_FALSE((errno !=3D 0) && (vstart_csr =3D=3D -1)); + + errno =3D 0; + vl_csr =3D ptrace(PTRACE_PEEKDATA, pid, &vl, NULL); + ASSERT_FALSE((errno !=3D 0) && (vl_csr =3D=3D -1)); + + errno =3D 0; + vtype_csr =3D ptrace(PTRACE_PEEKDATA, pid, &vtype, NULL); + ASSERT_FALSE((errno !=3D 0) && (vtype_csr =3D=3D -1)); + + errno =3D 0; + vcsr_csr =3D ptrace(PTRACE_PEEKDATA, pid, &vcsr, NULL); + ASSERT_FALSE((errno !=3D 0) && (vcsr_csr =3D=3D -1)); + + errno =3D 0; + vlenb_csr =3D ptrace(PTRACE_PEEKDATA, pid, &vlenb, NULL); + ASSERT_FALSE((errno !=3D 0) && (vlenb_csr =3D=3D -1)); + + /* read tracee csr regs using ptrace GETREGSET */ + + regset_size =3D sizeof(*regset_data) + vlenb_csr * 32; + regset_data =3D calloc(1, regset_size); + + iov.iov_base =3D regset_data; + iov.iov_len =3D regset_size; + + ASSERT_EQ(0, ptrace(PTRACE_GETREGSET, pid, NT_RISCV_VECTOR, &iov)); + + /* compare */ + + EXPECT_EQ(vstart_csr, regset_data->vstart); + EXPECT_EQ(vtype_csr, regset_data->vtype); + EXPECT_EQ(vlenb_csr, regset_data->vlenb); + EXPECT_EQ(vcsr_csr, regset_data->vcsr); + EXPECT_EQ(vl_csr, regset_data->vl); + + /* cleanup */ + + ASSERT_EQ(0, kill(pid, SIGKILL)); + } +} + TEST_HARNESS_MAIN --=20 2.51.0