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diff --git a/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/gcc/hexagon.h b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/gcc/hexagon.h
new file mode 100644
index 0000000..62ad0da
--- /dev/null
+++ b/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps/gcc/hexagon.h
@@ -0,0 +1,98 @@
+/*
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose,  provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+#include "../all_aligned_atomic_load_store.h"
+
+#include "../test_and_set_t_is_ao_t.h"
+
+/* There's also "isync" and "barrier"; however, for all current CPU     */
+/* versions, "syncht" should suffice.  Likewise, it seems that the      */
+/* auto-defined versions of *_acquire, *_release or *_full suffice for  */
+/* all current ISA implementations.                                     */
+AO_INLINE void
+AO_nop_full(void)
+{
+  __asm__ __volatile__("syncht" : : : "memory");
+}
+#define AO_HAVE_nop_full
+
+/* The Hexagon has load-locked, store-conditional primitives, and so    */
+/* resulting code is very nearly identical to that of PowerPC.          */
+
+AO_INLINE AO_t
+AO_fetch_and_add(volatile AO_t *addr, AO_t incr)
+{
+  AO_t oldval;
+  AO_t newval;
+  __asm__ __volatile__(
+     "1:\n"
+     "  %0 = memw_locked(%3);\n"        /* load and reserve            */
+     "  %1 = add (%0,%4);\n"            /* increment                   */
+     "  memw_locked(%3,p1) = %1;\n"     /* store conditional           */
+     "  if (!p1) jump 1b;\n"            /* retry if lost reservation   */
+     : "=&r"(oldval), "=&r"(newval), "+m"(*addr)
+     : "r"(addr), "r"(incr)
+     : "memory", "p1");
+  return oldval;
+}
+#define AO_HAVE_fetch_and_add
+
+AO_INLINE AO_TS_VAL_t
+AO_test_and_set(volatile AO_TS_t *addr)
+{
+  int oldval;
+  int locked_value = 1;
+
+  __asm__ __volatile__(
+     "1:\n"
+     "  %0 = memw_locked(%2);\n"        /* load and reserve            */
+     "  {\n"
+     "    p2 = cmp.eq(%0,#0);\n"        /* if load is not zero,        */
+     "    if (!p2.new) jump:nt 2f; \n"  /* we are done                 */
+     "  }\n"
+     "  memw_locked(%2,p1) = %3;\n"     /* else store conditional      */
+     "  if (!p1) jump 1b;\n"            /* retry if lost reservation   */
+     "2:\n"                             /* oldval is zero if we set    */
+     : "=&r"(oldval), "+m"(*addr)
+     : "r"(addr), "r"(locked_value)
+     : "memory", "p1", "p2");
+  return (AO_TS_VAL_t)oldval;
+}
+#define AO_HAVE_test_and_set
+
+AO_INLINE int
+AO_compare_and_swap(volatile AO_t *addr, AO_t old, AO_t new_val)
+{
+  AO_t __oldval;
+  int result = 0;
+  __asm__ __volatile__(
+     "1:\n"
+     "  %0 = memw_locked(%3);\n"        /* load and reserve            */
+     "  {\n"
+     "    p2 = cmp.eq(%0,%4);\n"        /* if load is not equal to     */
+     "    if (!p2.new) jump:nt 2f; \n"  /* old, fail                   */
+     "  }\n"
+     "  memw_locked(%3,p1) = %5;\n"     /* else store conditional      */
+     "  if (!p1) jump 1b;\n"            /* retry if lost reservation   */
+     "  %1 = #1\n"                      /* success, result = 1         */
+     "2:\n"
+     : "=&r" (__oldval), "+r" (result), "+m"(*addr)
+     : "r" (addr), "r" (old), "r" (new_val)
+     : "p1", "p2", "memory"
+  );
+  return result;
+}
+#define AO_HAVE_compare_and_swap
+
+/* Generalize first to define more AO_int_... primitives.       */
+#include "../../generalize.h"
+
+#include "../ao_t_is_int.h"