1 files changed, 64 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/aarch64/Gis_signal_frame.c b/src/third_party/unwind/dist/src/aarch64/Gis_signal_frame.c
new file mode 100644
index 00000000000..67159d83961
--- /dev/null
+++ b/src/third_party/unwind/dist/src/aarch64/Gis_signal_frame.c
@@ -0,0 +1,64 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
+   Copyright (C) 2013 Linaro Limited
+
+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.  */
+
+#include "unwind_i.h"
+
+/* The restorer stub will always have the form:
+
+   d2801168        movz    x8, #0x8b
+   d4000001        svc     #0x0
+*/
+
+int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+#ifdef __linux__
+  struct cursor *c = (struct cursor *) cursor;
+  unw_word_t w0, ip;
+  unw_addr_space_t as;
+  unw_accessors_t *a;
+  void *arg;
+  int ret;
+
+  as = c->dwarf.as;
+  a = unw_get_accessors_int (as);
+  arg = c->dwarf.as_arg;
+
+  ip = c->dwarf.ip;
+
+  ret = (*a->access_mem) (as, ip, &w0, 0, arg);
+  if (ret < 0)
+    return ret;
+
+  /* FIXME: distinguish 32bit insn vs 64bit registers.  */
+  if (w0 != 0xd4000001d2801168)
+    return 0;
+
+  return 1;
+
+#else
+  return -UNW_ENOINFO;
+#endif
+}