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-rw-r--r--lib/memcpy_kunit.c22
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
}