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diff --git a/src/third_party/unwind/dist/src/x86_64/unwind_i.h b/src/third_party/unwind/dist/src/x86_64/unwind_i.h
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index 00000000000..e95a60ff376
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+++ b/src/third_party/unwind/dist/src/x86_64/unwind_i.h
@@ -0,0 +1,93 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2002, 2005 Hewlett-Packard Co
+        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+   Modified for x86_64 by Max Asbock <masbock@us.ibm.com>
+
+This file is part of libunwind.
+
+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.  */
+
+#ifndef unwind_i_h
+#define unwind_i_h
+
+#include <stdint.h>
+
+#include <libunwind-x86_64.h>
+
+#include "libunwind_i.h"
+#include <sys/ucontext.h>
+
+/* DWARF column numbers for x86_64: */
+#define RAX     0
+#define RDX     1
+#define RCX     2
+#define RBX     3
+#define RSI     4
+#define RDI     5
+#define RBP     6
+#define RSP     7
+#define R8      8
+#define R9      9
+#define R10     10
+#define R11     11
+#define R12     12
+#define R13     13
+#define R14     14
+#define R15     15
+#define RIP     16
+
+#define x86_64_lock                     UNW_OBJ(lock)
+#define x86_64_local_resume             UNW_OBJ(local_resume)
+#define x86_64_local_addr_space_init    UNW_OBJ(local_addr_space_init)
+#define setcontext                      UNW_ARCH_OBJ (setcontext)
+#if 0
+#define x86_64_scratch_loc              UNW_OBJ(scratch_loc)
+#endif
+#define x86_64_r_uc_addr                UNW_OBJ(r_uc_addr)
+#define x86_64_sigreturn                UNW_OBJ(sigreturn)
+
+/* By-pass calls to access_mem() when known to be safe. */
+#ifdef UNW_LOCAL_ONLY
+# undef ACCESS_MEM_FAST
+# define ACCESS_MEM_FAST(ret,validate,cur,addr,to)                     \
+  do {                                                                 \
+    if (unlikely(validate))                                            \
+      (ret) = dwarf_get ((cur), DWARF_MEM_LOC ((cur), (addr)), &(to)); \
+    else                                                               \
+      (ret) = 0, (to) = *(unw_word_t *)(addr);                         \
+  } while (0)
+#endif
+
+extern void x86_64_local_addr_space_init (void);
+extern int x86_64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor,
+                             void *arg);
+extern int setcontext (const ucontext_t *ucp);
+
+#if 0
+extern dwarf_loc_t x86_64_scratch_loc (struct cursor *c, unw_regnum_t reg);
+#endif
+
+extern void *x86_64_r_uc_addr (ucontext_t *uc, int reg);
+extern NORETURN void x86_64_sigreturn (unw_cursor_t *cursor);
+#define x86_64_handle_signal_frame UNW_OBJ(handle_signal_frame)
+extern int x86_64_handle_signal_frame(unw_cursor_t *cursor);
+
+#endif /* unwind_i_h */