diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 6937ec0..1e17544 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,11 @@
+2015-01-05  Zachary T Welch  <zwelch@codesourcery.com>
+
+	* configure.ac: Add check for -m32 on x86_64-*-mingw*.
+	* configure.srv: If using -m32 on x86_64-*-mingw*, use i386
+	instead of amd64 registers.
+	* configure: Regenerated.
+	* aclocal.m4: Regenerated.
+
 2015-01-01  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdbreplay.c (gdbreplay_version): Update copyright year to 2015.
diff --git a/gdb/gdbserver/aclocal.m4 b/gdb/gdbserver/aclocal.m4
index 7b546b7..0105e8e 100644
--- a/gdb/gdbserver/aclocal.m4
+++ b/gdb/gdbserver/aclocal.m4
@@ -1,7 +1,7 @@
-# generated automatically by aclocal 1.11.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.13.1 -*- Autoconf -*-
+
+# Copyright (C) 1996-2012 Free Software Foundation, Inc.
 
-# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-# 2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -11,24 +11,22 @@
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 # PARTICULAR PURPOSE.
 
+m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
 # AM_CONDITIONAL                                            -*- Autoconf -*-
 
-# Copyright (C) 1997, 2000, 2001, 2003, 2004, 2005, 2006, 2008
-# Free Software Foundation, Inc.
+# Copyright (C) 1997-2013 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 9
-
 # AM_CONDITIONAL(NAME, SHELL-CONDITION)
 # -------------------------------------
 # Define a conditional.
 AC_DEFUN([AM_CONDITIONAL],
-[AC_PREREQ(2.52)dnl
- ifelse([$1], [TRUE],  [AC_FATAL([$0: invalid condition: $1])],
-	[$1], [FALSE], [AC_FATAL([$0: invalid condition: $1])])dnl
+[AC_PREREQ([2.52])dnl
+ m4_if([$1], [TRUE],  [AC_FATAL([$0: invalid condition: $1])],
+       [$1], [FALSE], [AC_FATAL([$0: invalid condition: $1])])dnl
 AC_SUBST([$1_TRUE])dnl
 AC_SUBST([$1_FALSE])dnl
 _AM_SUBST_NOTMAKE([$1_TRUE])dnl
@@ -50,20 +48,17 @@ fi])])
 # Add --enable-maintainer-mode option to configure.         -*- Autoconf -*-
 # From Jim Meyering
 
-# Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2008
-# Free Software Foundation, Inc.
+# Copyright (C) 1996-2013 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 5
-
 # AM_MAINTAINER_MODE([DEFAULT-MODE])
 # ----------------------------------
 # Control maintainer-specific portions of Makefiles.
-# Default is to disable them, unless `enable' is passed literally.
-# For symmetry, `disable' may be passed as well.  Anyway, the user
+# Default is to disable them, unless 'enable' is passed literally.
+# For symmetry, 'disable' may be passed as well.  Anyway, the user
 # can override the default with the --enable/--disable switch.
 AC_DEFUN([AM_MAINTAINER_MODE],
 [m4_case(m4_default([$1], [disable]),
@@ -71,13 +66,14 @@ AC_DEFUN([AM_MAINTAINER_MODE],
        [disable], [m4_define([am_maintainer_other], [enable])],
        [m4_define([am_maintainer_other], [enable])
         m4_warn([syntax], [unexpected argument to AM@&t@_MAINTAINER_MODE: $1])])
-AC_MSG_CHECKING([whether to am_maintainer_other maintainer-specific portions of Makefiles])
+AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
   dnl maintainer-mode's default is 'disable' unless 'enable' is passed
   AC_ARG_ENABLE([maintainer-mode],
-[  --][am_maintainer_other][-maintainer-mode  am_maintainer_other make rules and dependencies not useful
-			  (and sometimes confusing) to the casual installer],
-      [USE_MAINTAINER_MODE=$enableval],
-      [USE_MAINTAINER_MODE=]m4_if(am_maintainer_other, [enable], [no], [yes]))
+    [AS_HELP_STRING([--]am_maintainer_other[-maintainer-mode],
+      am_maintainer_other[ make rules and dependencies not useful
+      (and sometimes confusing) to the casual installer])],
+    [USE_MAINTAINER_MODE=$enableval],
+    [USE_MAINTAINER_MODE=]m4_if(am_maintainer_other, [enable], [no], [yes]))
   AC_MSG_RESULT([$USE_MAINTAINER_MODE])
   AM_CONDITIONAL([MAINTAINER_MODE], [test $USE_MAINTAINER_MODE = yes])
   MAINT=$MAINTAINER_MODE_TRUE
@@ -85,16 +81,12 @@ AC_MSG_CHECKING([whether to am_maintainer_other maintainer-specific portions of
 ]
 )
 
-AU_DEFUN([jm_MAINTAINER_MODE], [AM_MAINTAINER_MODE])
-
-# Copyright (C) 2006, 2008  Free Software Foundation, Inc.
+# Copyright (C) 2006-2013 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 2
-
 # _AM_SUBST_NOTMAKE(VARIABLE)
 # ---------------------------
 # Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
@@ -102,7 +94,7 @@ AU_DEFUN([jm_MAINTAINER_MODE], [AM_MAINTAINER_MODE])
 AC_DEFUN([_AM_SUBST_NOTMAKE])
 
 # AM_SUBST_NOTMAKE(VARIABLE)
-# ---------------------------
+# --------------------------
 # Public sister of _AM_SUBST_NOTMAKE.
 AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 45efc51..8776a6f 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -1325,8 +1325,9 @@ Optional Features:
   --disable-option-checking  ignore unrecognized --enable/--with options
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
-  --enable-maintainer-mode  enable make rules and dependencies not useful
-			  (and sometimes confusing) to the casual installer
+  --enable-maintainer-mode
+                          enable make rules and dependencies not useful (and
+                          sometimes confusing) to the casual installer
   --disable-largefile     omit support for large files
   --enable-libmcheck      Try linking with -lmcheck if available
   --enable-werror         treat compile warnings as errors
@@ -5535,6 +5536,35 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_m68k_is_coldfire" >&5
 $as_echo "$gdb_cv_m68k_is_coldfire" >&6; }
     ;;
+  x86_64-*-mingw*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking if building with -m32" >&5
+$as_echo_n "checking if building with -m32... " >&6; }
+if test "${gdb_cv_x86_64_is_i386+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  save_CPPFLAGS="$CPPFLAGS"
+		    CPPFLAGS="$CPPFLAGS $CFLAGS"
+                    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#if ! __x86_64__
+got it
+#endif
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "got it" >/dev/null 2>&1; then :
+  gdb_cv_w64_x86_64_is_i386=yes
+else
+  gdb_cv_w64_x86_64_is_i386=no
+fi
+rm -f conftest*
+
+                    CPPFLAGS="$save_CPPFLAGS"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_x86_64_is_i386" >&5
+$as_echo "$gdb_cv_x86_64_is_i386" >&6; }
+    ;;
 esac
 
 . ${srcdir}/configure.srv
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index 02082cc..ff9e272 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -238,6 +238,18 @@ got it
                     [gdb_cv_m68k_is_coldfire=no])
                     CPPFLAGS="$save_CPPFLAGS"])
     ;;
+  x86_64-*-mingw*)
+    AC_CACHE_CHECK([if building with -m32], [gdb_cv_x86_64_is_i386],
+		   [save_CPPFLAGS="$CPPFLAGS"
+		    CPPFLAGS="$CPPFLAGS $CFLAGS"
+                    AC_EGREP_CPP([got it], [
+#if ! __x86_64__
+got it
+#endif
+                 ], [gdb_cv_w64_x86_64_is_i386=yes],
+                    [gdb_cv_w64_x86_64_is_i386=no])
+                    CPPFLAGS="$save_CPPFLAGS"])
+    ;;
 esac
 
 . ${srcdir}/configure.srv
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index 679fc9f..e0d5413 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -325,6 +325,9 @@ case "${target}" in
 			ipa_obj="${ipa_amd64_linux_regobj} linux-amd64-ipa.o"
 			;;
   x86_64-*-mingw*)	srv_regobj="$srv_amd64_regobj"
+			if test "$gdb_cv_w64_x86_64_is_i386" = yes ; then
+			  srv_regobj="$srv_i386_regobj"
+			fi
 			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o win32-i386-low.o"
 			srv_xmlfiles="$srv_i386_xmlfiles $srv_amd64_xmlfiles"
 			srv_mingw=yes
