--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/alpha/vms-unwind.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,71 @@
+/* DWARF2 EH unwinding support for Alpha VMS.
+   Copyright (C) 2004, 2007 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.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include <pdscdef.h>
+
+#define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
+
+static _Unwind_Reason_Code
+alpha_fallback_frame_state (struct _Unwind_Context *context,
+			    _Unwind_FrameState *fs)
+{
+  PDSCDEF *pv = *((PDSCDEF **) context->reg [29]);
+
+  if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */
+    pv = *(PDSCDEF **) pv;
+
+  if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK))
+    {
+      int i, j;
+
+      fs->regs.cfa_offset = pv->pdsc$l_size;
+      fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
+      fs->retaddr_column = 26;
+      fs->regs.cfa_how = CFA_REG_OFFSET;
+      fs->regs.reg[27].loc.offset = -pv->pdsc$l_size;
+      fs->regs.reg[27].how = REG_SAVED_OFFSET;
+      fs->regs.reg[26].loc.offset
+	= -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset);
+      fs->regs.reg[26].how = REG_SAVED_OFFSET;
+
+      for (i = 0, j = 0; i < 32; i++)
+	if (1<<i & pv->pdsc$l_ireg_mask)
+	  {
+	    fs->regs.reg[i].loc.offset
+	      = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j);
+	    fs->regs.reg[i].how = REG_SAVED_OFFSET;
+	  }
+
+      return _URC_NO_REASON;
+    }
+  else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER))
+    {
+      fs->regs.cfa_offset = pv->pdsc$l_size;
+      fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
+      fs->retaddr_column = 26;
+      fs->regs.cfa_how = CFA_REG_OFFSET;
+      fs->regs.reg[26].loc.reg = pv->pdsc$b_save_ra;
+      fs->regs.reg[26].how = REG_SAVED_REG;
+      fs->regs.reg[29].loc.reg = pv->pdsc$b_save_fp;
+      fs->regs.reg[29].how = REG_SAVED_REG;
+
+      return _URC_NO_REASON;
+    }
+  return _URC_END_OF_STACK;
+}