Adding upstream version 2.06.upstream/2.06upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/grub-core/tests/div_test.c b/grub-core/tests/div_test.c
new file mode 100644
index 0000000..9abc6d5
--- /dev/null
+++ b/grub-core/tests/div_test.c
@@ -0,0 +1,189 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/test.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_uint64_t vectors[][2] = {
+  { 0xffffffffffffffffULL, 1},
+  { 1, 0xffffffffffffffffULL},
+  { 0xffffffffffffffffULL, 0xffffffffffffffffULL},
+  { 1, 1 },
+  { 2, 1 }
+};
+
+static void
+test32 (grub_uint32_t a, grub_uint32_t b)
+{
+  grub_uint64_t q, r;
+  if (b == 0)
+    return;
+  q = grub_divmod64 (a, b, &r);
+  grub_test_assert (r < b, "remainder is larger than dividend: 0x%llx %% 0x%llx = 0x%llx",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (q * b + r == a, "division doesn't satisfy base property: 0x%llx * 0x%llx + 0x%llx != 0x%llx", (long long) q, (long long) b, (long long) r,
+		    (long long) a);
+  /* Overflow check.  */
+  grub_test_assert ((q >> 32) == 0,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  grub_test_assert ((r >> 32) == 0,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  /* q * b + r is at most:
+     0xffffffff * 0xffffffff + 0xffffffff = 0xffffffff00000000
+     so no overflow
+   */
+  grub_test_assert (q == (a / b),
+		    "C compiler division failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  grub_test_assert (r == (a % b),
+		    "C compiler modulo failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+}
+
+static void
+test64 (grub_uint64_t a, grub_uint64_t b)
+{
+  grub_uint64_t q, r;
+  grub_uint64_t x1, x2;
+  q = grub_divmod64 (a, b, &r);
+  grub_test_assert (r < b, "remainder is larger than dividend: 0x%llx %% 0x%llx = 0x%llx",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (q * b + r == a, "division doesn't satisfy base property: 0x%llx * 0x%llx + 0x%llx != 0x%llx", (long long) q, (long long) b, (long long) r,
+		    (long long) a);
+  /* Overflow checks.  */
+  grub_test_assert ((q >> 32) * (b >> 32) == 0,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x1 = (q >> 32) * (b & 0xffffffff);
+  grub_test_assert (x1 < (1LL << 32),
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x1 <<= 32;
+  x2 = (b >> 32) * (q & 0xffffffff);
+  grub_test_assert (x2 < (1LL << 32),
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x2 <<= 32;
+  grub_test_assert (x1 <= ~x2,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x1 += x2;
+  x2 = (q & 0xffffffff) * (b & 0xffffffff);
+  grub_test_assert (x1 <= ~x2,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x1 += x2;
+  grub_test_assert (x1 <= ~r,
+		    "division overflow in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  x1 += r;
+  grub_test_assert (a == x1,
+		    "division overflow test failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+#if GRUB_TARGET_SIZEOF_VOID_P == 8
+  grub_test_assert (q == (a / b),
+		    "C compiler division failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  grub_test_assert (r == (a % b),
+		    "C compiler modulo failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+#endif
+}
+
+static grub_int64_t
+abs64(grub_int64_t a)
+{
+  return a > 0 ? a : -a;
+}
+
+static void
+test32s (grub_int32_t a, grub_int32_t b)
+{
+  grub_int64_t q, r;
+  if (b == 0)
+    return;
+
+  q = grub_divmod64s (a, b, &r);
+  grub_test_assert (a > 0 ? r >= 0 : r <= 0, "remainder sign mismatch: %lld %% %lld = %lld",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (((a > 0) == (b > 0)) ? q >= 0 : q <= 0, "quotient sign mismatch: %lld / %lld = %lld",
+		    (long long) a, (long long) b, (long long) q);
+  grub_test_assert (abs64(r) < abs64(b), "remainder is larger than dividend: %lld %% %lld = %lld",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (q * b + r == a, "division doesn't satisfy base property: %lld * %lld + %lld != %lld", (long long) q, (long long) b, (long long) r,
+		    (long long) a);
+  if (0) {  grub_test_assert (q == (a / b),
+		    "C compiler division failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  grub_test_assert (r == (a % b),
+		    "C compiler modulo failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  }
+}
+
+static void
+test64s (grub_int64_t a, grub_int64_t b)
+{
+  grub_int64_t q, r;
+  q = grub_divmod64s (a, b, &r);
+
+  grub_test_assert (a > 0 ? r >= 0 : r <= 0, "remainder sign mismatch: %lld %% %lld = %lld",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (((a > 0) == (b > 0)) ? q >= 0 : q <= 0, "quotient sign mismatch: %lld / %lld = %lld",
+		    (long long) a, (long long) b, (long long) q);
+  grub_test_assert (abs64(r) < abs64(b), "remainder is larger than dividend: %lld %% %lld = %lld",
+		    (long long) a, (long long) b, (long long) r);
+  grub_test_assert (q * b + r == a, "division doesn't satisfy base property: 0x%llx * 0x%llx + 0x%llx != 0x%llx", (long long) q, (long long) b, (long long) r,
+		    (long long) a);
+#if GRUB_TARGET_SIZEOF_VOID_P == 8
+  grub_test_assert (q == (a / b),
+		    "C compiler division failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+  grub_test_assert (r == (a % b),
+		    "C compiler modulo failure in 0x%llx, 0x%llx", (long long) a, (long long) b);
+#endif
+}
+
+static void
+test_all(grub_uint64_t a, grub_uint64_t b)
+{
+  test64 (a, b);
+  test32 (a, b);
+  test64s (a, b);
+  test32s (a, b);
+  test64s (a, -b);
+  test32s (a, -b);
+  test64s (-a, b);
+  test32s (-a, b);
+  test64s (-a, -b);
+  test32s (-a, -b);
+}
+
+static void
+div_test (void)
+{
+  grub_uint64_t a = 404, b = 7;
+  grub_size_t i;
+
+  for (i = 0; i < ARRAY_SIZE (vectors); i++)
+    {
+      test_all (vectors[i][0], vectors[i][1]);
+    }
+  for (i = 0; i < 40000; i++)
+    {
+      a = 17 * a + 13 * b;
+      b = 23 * a + 29 * b;
+      if (b == 0)
+	b = 1;
+      if (a == 0)
+	a = 1;
+      test_all (a, b);
+    }
+}
+
+/* Register example_test method as a functional test.  */
+GRUB_FUNCTIONAL_TEST (div_test, div_test);