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diff --git a/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/emul_cas.h b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/emul_cas.h
new file mode 100644
index 0000000..10da0b7
--- /dev/null
+++ b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/emul_cas.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2003 by Hewlett-Packard Company.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * Ensure, if at all possible, that AO_compare_and_swap_full() is
+ * available.  The emulation should be brute-force signal-safe, even
+ * though it actually blocks.
+ * Including this file will generate an error if AO_compare_and_swap_full()
+ * cannot be made available.
+ * This will be included from platform-specific atomic_ops files
+ * if appropriate, and if AO_REQUIRE_CAS is defined.  It should not be
+ * included directly, especially since it affects the implementation
+ * of other atomic update primitives.
+ * The implementation assumes that only AO_store_XXX and AO_test_and_set_XXX
+ * variants are defined, and that AO_test_and_set_XXX is not used to
+ * operate on compare_and_swap locations.
+ */
+
+#if !defined(ATOMIC_OPS_H)
+#  error This file should not be included directly.
+#endif
+
+#ifndef AO_HAVE_double_t
+# include "standard_ao_double_t.h"
+#endif
+
+int AO_compare_and_swap_emulation(volatile AO_t *addr, AO_t old,
+                                  AO_t new_val);
+
+int AO_compare_double_and_swap_double_emulation(volatile AO_double_t *addr,
+                                                AO_t old_val1, AO_t old_val2,
+                                                AO_t new_val1, AO_t new_val2);
+
+void AO_store_full_emulation(volatile AO_t *addr, AO_t val);
+
+#define AO_compare_and_swap_full(addr, old, newval) \
+       AO_compare_and_swap_emulation(addr, old, newval)
+#define AO_HAVE_compare_and_swap_full
+
+#ifndef AO_HAVE_compare_double_and_swap_double
+# define AO_compare_double_and_swap_double_full(addr, old1, old2, \
+                                                newval1, newval2) \
+        AO_compare_double_and_swap_double_emulation(addr, old1, old2, \
+                                                    newval1, newval2)
+# define AO_HAVE_compare_double_and_swap_double_full
+#endif
+
+#undef AO_store
+#undef AO_HAVE_store
+#undef AO_store_write
+#undef AO_HAVE_store_write
+#undef AO_store_release
+#undef AO_HAVE_store_release
+#undef AO_store_full
+#undef AO_HAVE_store_full
+#define AO_store_full(addr, val) AO_store_full_emulation(addr, val)
+#define AO_HAVE_store_full