1 files changed, 69 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/rs6000/freebsd-unwind.h b/gcc-4.9/libgcc/config/rs6000/freebsd-unwind.h
new file mode 100644
index 000000000..bb8cae0f5
--- /dev/null
+++ b/gcc-4.9/libgcc/config/rs6000/freebsd-unwind.h
@@ -0,0 +1,69 @@
+/* DWARF2 EH unwinding support for PowerPC64 FreeBSD.
+   Copyright (C) 2012-2014 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC 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, or (at your
+   option) any later version.
+
+   GCC 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.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define R_LR		65
+
+#define MD_FROB_UPDATE_CONTEXT frob_update_context
+
+static void
+frob_update_context (struct _Unwind_Context *context,
+		     _Unwind_FrameState *fs ATTRIBUTE_UNUSED)
+{
+  const unsigned int *pc = (const unsigned int *) context->ra;
+
+#ifdef __powerpc64__
+  if (fs->regs.reg[2].how == REG_UNSAVED)
+    {
+      /* If the current unwind info (FS) does not contain explicit info
+	 saving R2, then we have to do a minor amount of code reading to
+	 figure out if it was saved.  The big problem here is that the
+	 code that does the save/restore is generated by the linker, so
+	 we have no good way to determine at compile time what to do.  */
+      if (pc[0] == 0xF8410028
+	  || ((pc[0] & 0xFFFF0000) == 0x3D820000
+	      && pc[1] == 0xF8410028))
+	{
+	  /* We are in a plt call stub or r2 adjusting long branch stub,
+	     before r2 has been saved.  Keep REG_UNSAVED.  */
+	}
+      else
+	{
+	  unsigned int *insn
+	    = (unsigned int *) _Unwind_GetGR (context, R_LR);
+	  if (insn && *insn == 0xE8410028)
+	    _Unwind_SetGRPtr (context, 2, context->cfa + 40);
+	  else if (pc[0] == 0x4E800421
+		   && pc[1] == 0xE8410028)
+	    {
+	      /* We are at the bctrl instruction in a call via function
+		 pointer.  gcc always emits the load of the new R2 just
+		 before the bctrl so this is the first and only place
+		 we need to use the stored R2.  */
+	      _Unwind_Word sp = _Unwind_GetGR (context, 1);
+	      _Unwind_SetGRPtr (context, 2, (void *)(sp + 40));
+	    }
+	}
+    }
+#endif
+}