--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/common/config/s390/s390-common.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,137 @@
+/* Common hooks for IBM S/390 and zSeries.
+   Copyright (C) 1999-2017 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 "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "diagnostic-core.h"
+#include "tm.h"
+#include "common/common-target.h"
+#include "common/common-target-def.h"
+#include "opts.h"
+#include "flags.h"
+
+EXPORTED_CONST int processor_flags_table[] =
+  {
+    /* g5 */     PF_IEEE_FLOAT,
+    /* g6 */     PF_IEEE_FLOAT,
+    /* z900 */   PF_IEEE_FLOAT | PF_ZARCH,
+    /* z990 */   PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT,
+    /* z9-109 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM,
+    /* z9-ec */  PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP,
+    /* z10 */    PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP | PF_Z10,
+    /* z196 */   PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196,
+    /* zEC12 */  PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX,
+    /* z13 */    PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
+                 | PF_Z13 | PF_VX,
+    /* arch12 */ PF_IEEE_FLOAT | PF_ZARCH | PF_LONG_DISPLACEMENT
+                 | PF_EXTIMM | PF_DFP | PF_Z10 | PF_Z196 | PF_ZEC12 | PF_TX
+                 | PF_Z13 | PF_VX | PF_VXE | PF_ARCH12
+  };
+
+/* Change optimizations to be performed, depending on the
+   optimization level.  */
+
+static const struct default_options s390_option_optimization_table[] =
+  {
+    { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+
+    /* Enable -fsched-pressure by default when optimizing.  */
+    { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
+
+    /* ??? There are apparently still problems with -fcaller-saves.  */
+    { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 },
+
+    /* Use MVCLE instructions to decrease code size if requested.  */
+    { OPT_LEVELS_SIZE, OPT_mmvcle, NULL, 1 },
+
+    { OPT_LEVELS_NONE, 0, NULL, 0 }
+  };
+
+/* Implement TARGET_OPTION_INIT_STRUCT.  */
+
+static void
+s390_option_init_struct (struct gcc_options *opts)
+{
+  /* By default, always emit DWARF-2 unwind info.  This allows debugging
+     without maintaining a stack frame back-chain.  */
+  opts->x_flag_asynchronous_unwind_tables = 1;
+}
+
+/* Implement TARGET_HANDLE_OPTION.  */
+
+bool
+s390_handle_option (struct gcc_options *opts ATTRIBUTE_UNUSED,
+		    struct gcc_options *opts_set ATTRIBUTE_UNUSED,
+  		    const struct cl_decoded_option *decoded,
+		    location_t loc)
+{
+  size_t code = decoded->opt_index;
+  int value = decoded->value;
+
+  switch (code)
+    {
+    case OPT_mstack_guard_:
+      if (value != 0 && exact_log2 (value) == -1)
+	error_at (loc, "stack guard value must be an exact power of 2");
+      return true;
+
+    case OPT_mstack_size_:
+      if (value != 0 && exact_log2 (value) == -1)
+	error_at (loc, "stack size must be an exact power of 2");
+      return true;
+
+    default:
+      return true;
+    }
+}
+
+/* -fsplit-stack uses a field in the TCB, available with glibc-2.23.
+   We don't verify it, since earlier versions just have padding at
+   its place, which works just as well.  */
+
+static bool
+s390_supports_split_stack (bool report ATTRIBUTE_UNUSED,
+			   struct gcc_options *opts ATTRIBUTE_UNUSED)
+{
+  return true;
+}
+
+#undef TARGET_DEFAULT_TARGET_FLAGS
+#define TARGET_DEFAULT_TARGET_FLAGS (TARGET_DEFAULT)
+
+#undef TARGET_HANDLE_OPTION
+#define TARGET_HANDLE_OPTION s390_handle_option
+
+#undef TARGET_OPTION_OPTIMIZATION_TABLE
+#define TARGET_OPTION_OPTIMIZATION_TABLE s390_option_optimization_table
+
+#undef TARGET_OPTION_INIT_STRUCT
+#define TARGET_OPTION_INIT_STRUCT s390_option_init_struct
+
+#undef TARGET_SUPPORTS_SPLIT_STACK
+#define TARGET_SUPPORTS_SPLIT_STACK s390_supports_split_stack
+
+struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;