Add a test to v_ptrace test suite to verify that ptrace rejects the invalid input combinations of vector csr registers. Use kselftest fixture variants to create multiple invalid inputs for the test.
Signed-off-by: Sergey Matyukevich <[email protected]> --- .../testing/selftests/riscv/vector/v_ptrace.c | 238 ++++++++++++++++++ 1 file changed, 238 insertions(+) diff --git a/tools/testing/selftests/riscv/vector/v_ptrace.c b/tools/testing/selftests/riscv/vector/v_ptrace.c index 9fea29f7b686..023e1faa84bf 100644 --- a/tools/testing/selftests/riscv/vector/v_ptrace.c +++ b/tools/testing/selftests/riscv/vector/v_ptrace.c @@ -183,4 +183,242 @@ TEST(ptrace_v_early_debug) } } +FIXTURE(v_csr_invalid) +{ +}; + +FIXTURE_SETUP(v_csr_invalid) +{ +} + +FIXTURE_TEARDOWN(v_csr_invalid) +{ +} + +/* modifications of the initial vsetvli settings */ +FIXTURE_VARIANT(v_csr_invalid) +{ + unsigned long vstart; + unsigned long vl; + unsigned long vtype; + unsigned long vcsr; + unsigned long vlenb_mul; + unsigned long vlenb_min; + unsigned long vlenb_max; +}; + +/* unexpected vlenb value */ +FIXTURE_VARIANT_ADD(v_csr_invalid, new_vlenb) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x3, + .vcsr = 0x0, + .vlenb_mul = 0x2, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* invalid reserved bits in vcsr */ +FIXTURE_VARIANT_ADD(v_csr_invalid, vcsr_invalid_reserved_bits) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x3, + .vcsr = 0x1UL << 8, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* invalid reserved bits in vtype */ +FIXTURE_VARIANT_ADD(v_csr_invalid, vtype_invalid_reserved_bits) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = (0x1UL << 8) | 0x3, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* set vill bit */ +FIXTURE_VARIANT_ADD(v_csr_invalid, invalid_vill_bit) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = (0x1UL << (__riscv_xlen - 1)) | 0x3, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* reserved vsew value: vsew > 3 */ +FIXTURE_VARIANT_ADD(v_csr_invalid, reserved_vsew) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x4UL << 3, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* reserved vlmul value: vlmul == 4 */ +FIXTURE_VARIANT_ADD(v_csr_invalid, reserved_vlmul) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x4, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x0, +}; + +/* invalid fractional LMUL for VLEN <= 256: LMUL= 1/8, SEW = 64 */ +FIXTURE_VARIANT_ADD(v_csr_invalid, frac_lmul1) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x1d, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x20, +}; + +/* invalid integral LMUL for VLEN <= 16: LMUL= 2, SEW = 64 */ +FIXTURE_VARIANT_ADD(v_csr_invalid, int_lmul1) +{ + .vstart = 0x0, + .vl = 0x0, + .vtype = 0x19, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x2, +}; + +/* invalid VL for VLEN <= 128: LMUL= 2, SEW = 64, VL = 8 */ +FIXTURE_VARIANT_ADD(v_csr_invalid, vl1) +{ + .vstart = 0x0, + .vl = 0x8, + .vtype = 0x19, + .vcsr = 0x0, + .vlenb_mul = 0x1, + .vlenb_min = 0x0, + .vlenb_max = 0x10, +}; + +TEST_F(v_csr_invalid, ptrace_v_invalid_values) +{ + unsigned long vlenb; + pid_t pid; + + if (!is_vector_supported()) + SKIP(return, "Vector not supported"); + + asm volatile("csrr %[vlenb], vlenb" : [vlenb] "=r"(vlenb)); + if (variant->vlenb_min) { + if (vlenb < variant->vlenb_min) + SKIP(return, "This test does not support VLEN < %lu\n", + variant->vlenb_min * 8); + } + if (variant->vlenb_max) { + if (vlenb > variant->vlenb_max) + SKIP(return, "This test does not support VLEN > %lu\n", + variant->vlenb_max * 8); + } + + chld_lock = 1; + pid = fork(); + ASSERT_LE(0, pid) + TH_LOG("fork: %m"); + + if (pid == 0) { + unsigned long vl; + + while (chld_lock == 1) + asm volatile("" : : "g"(chld_lock) : "memory"); + + asm(".option arch, +zve32x\n"); + asm(".option arch, +c\n"); + + asm volatile("vsetvli %[new_vl], x0, e16, m2, tu, mu\n" + : [new_vl] "=r"(vl) + : + :); + + while (1) { + asm volatile("c.ebreak"); + asm volatile("c.nop"); + } + } else { + struct __riscv_v_regset_state *regset_data; + size_t regset_size; + struct iovec iov; + int status; + int ret; + + /* 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 the 1st c.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 GETREGSET */ + + regset_size = sizeof(*regset_data) + vlenb * 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)); + + /* verify initial vsetvli settings */ + + EXPECT_EQ(regset_data->vlenb, regset_data->vl); + EXPECT_EQ(9UL, regset_data->vtype); + EXPECT_EQ(vlenb, regset_data->vlenb); + EXPECT_EQ(0UL, regset_data->vstart); + EXPECT_EQ(0UL, regset_data->vcsr); + + /* apply invalid settings from fixture variants */ + + regset_data->vlenb *= variant->vlenb_mul; + regset_data->vstart = variant->vstart; + regset_data->vtype = variant->vtype; + regset_data->vcsr = variant->vcsr; + regset_data->vl = variant->vl; + + iov.iov_base = regset_data; + iov.iov_len = regset_size; + + errno = 0; + ret = ptrace(PTRACE_SETREGSET, pid, NT_RISCV_VECTOR, &iov); + ASSERT_EQ(errno, EINVAL); + ASSERT_EQ(ret, -1); + + /* cleanup */ + + ASSERT_EQ(0, kill(pid, SIGKILL)); + } +} + TEST_HARNESS_MAIN -- 2.51.0
