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Tue, 07 Oct 2025 04:58:51 -0700 (PDT) From: Sergey Matyukevich To: linux-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Oleg Nesterov , Shuah Khan , Jisheng Zhang , Thomas Gleixner , Thomas Huth , Charlie Jenkins , Andy Chiu , Han Gao , Samuel Holland , Nam Cao , Joel Granados , =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Conor Dooley , Sergey Matyukevich Subject: [PATCH v2 5/6] selftests: riscv: verify initial vector state with ptrace Date: Tue, 7 Oct 2025 14:58:21 +0300 Message-ID: <20251007115840.2320557-6-geomatsi@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251007115840.2320557-1-geomatsi@gmail.com> References: <20251007115840.2320557-1-geomatsi@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a test case that attaches to a traced process immediately after its first vector instructions to verify the initial vector context state. Signed-off-by: Sergey Matyukevich --- .../testing/selftests/riscv/vector/v_ptrace.c | 103 ++++++++++++++++++ 1 file changed, 103 insertions(+) diff --git a/tools/testing/selftests/riscv/vector/v_ptrace.c b/tools/testing/selftests/riscv/vector/v_ptrace.c index ccda8a4dc49b..f452e04629ea 100644 --- a/tools/testing/selftests/riscv/vector/v_ptrace.c +++ b/tools/testing/selftests/riscv/vector/v_ptrace.c @@ -196,4 +196,107 @@ TEST(ptrace_rvv_invalid_vtype) } } +TEST(ptrace_rvv_early_access) +{ + 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 = 1; + + pid = fork(); + + ASSERT_LE(0, pid) + TH_LOG("fork: %m"); + + if (pid == 0) { + while (chld_lock == 1) + asm volatile("" : : "g"(chld_lock) : "memory"); + + asm volatile("csrr %[vstart], vstart" : [vstart] "=r"(vstart)); + asm volatile("csrr %[vl], vl" : [vl] "=r"(vl)); + asm volatile("csrr %[vtype], vtype" : [vtype] "=r"(vtype)); + asm volatile("csrr %[vcsr], vcsr" : [vcsr] "=r"(vcsr)); + asm volatile("csrr %[vlenb], vlenb" : [vlenb] "=r"(vlenb)); + + asm volatile ("ebreak" : : : ); + } else { + struct __riscv_v_regset_state *regset_data; + unsigned long vstart_csr; + unsigned long vl_csr; + unsigned long vtype_csr; + unsigned long vcsr_csr; + unsigned long vlenb_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 = 0; + vstart_csr = ptrace(PTRACE_PEEKDATA, pid, &vstart, NULL); + ASSERT_FALSE((errno != 0) && (vstart_csr == -1)); + + errno = 0; + vl_csr = ptrace(PTRACE_PEEKDATA, pid, &vl, NULL); + ASSERT_FALSE((errno != 0) && (vl_csr == -1)); + + errno = 0; + vtype_csr = ptrace(PTRACE_PEEKDATA, pid, &vtype, NULL); + ASSERT_FALSE((errno != 0) && (vtype_csr == -1)); + + errno = 0; + vcsr_csr = ptrace(PTRACE_PEEKDATA, pid, &vcsr, NULL); + ASSERT_FALSE((errno != 0) && (vcsr_csr == -1)); + + errno = 0; + vlenb_csr = ptrace(PTRACE_PEEKDATA, pid, &vlenb, NULL); + ASSERT_FALSE((errno != 0) && (vlenb_csr == -1)); + + /* read tracee csr regs using ptrace GETREGSET */ + + regset_size = sizeof(*regset_data) + vlenb_csr * 32; + regset_data = calloc(1, regset_size); + + iov.iov_base = regset_data; + iov.iov_len = 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 -- 2.51.0