diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/memcpy_kunit.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/memcpy_kunit.c b/lib/memcpy_kunit.c index 2b5cc70ac53f..7513e6d5dc90 100644 --- a/lib/memcpy_kunit.c +++ b/lib/memcpy_kunit.c @@ -105,6 +105,8 @@ static void memcpy_test(struct kunit *test) #undef TEST_OP } +static unsigned char larger_array [2048]; + static void memmove_test(struct kunit *test) { #define TEST_OP "memmove" @@ -179,6 +181,26 @@ static void memmove_test(struct kunit *test) ptr = &overlap.data[2]; memmove(ptr, overlap.data, 5); compare("overlapping write", overlap, overlap_expected); + + /* Verify larger overlapping moves. */ + larger_array[256] = 0xAAu; + /* + * Test a backwards overlapping memmove first. 256 and 1024 are + * important for i386 to use rep movsl. + */ + memmove(larger_array, larger_array + 256, 1024); + KUNIT_ASSERT_EQ(test, larger_array[0], 0xAAu); + KUNIT_ASSERT_EQ(test, larger_array[256], 0x00); + KUNIT_ASSERT_NULL(test, + memchr(larger_array + 1, 0xaa, ARRAY_SIZE(larger_array) - 1)); + /* Test a forwards overlapping memmove. */ + larger_array[0] = 0xBBu; + memmove(larger_array + 256, larger_array, 1024); + KUNIT_ASSERT_EQ(test, larger_array[0], 0xBBu); + KUNIT_ASSERT_EQ(test, larger_array[256], 0xBBu); + KUNIT_ASSERT_NULL(test, memchr(larger_array + 1, 0xBBu, 256 - 1)); + KUNIT_ASSERT_NULL(test, + memchr(larger_array + 257, 0xBBu, ARRAY_SIZE(larger_array) - 257)); #undef TEST_OP } |