Re: SuperH port

[Ulrich Mueller <ulm@gentoo.org>]

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>>>>> On Wed, 08 Oct 2008, Stefan Monnier wrote:

> This port is wanted.  Thank you for your effort to bring it back to
> life.  Could someone install his change (and clean it up where
> appropriate)?

Please find an updated patch below, addressing most of Dan's
criticism:

- Support for NetBSD and OpenBSD has been removed since its status is
  unknown.
- Definitions of EXPLICIT_SIGN_EXTEND, VIRT_ADDR_VARIES and other
  unneccessary macros have been deleted.

However, I've left both files m/sh3el.h and m/sh3eb.h in for now,
since conditional definition of WORDS_BIG_ENDIAN would probably
require an autoconf test for endian.h. And then it's IMHO preferable
to use AC_C_BIGENDIAN instead.

>> dnl This could be used for targets which can have both byte sexes.
>> dnl We could presumably replace the hardwired WORDS_BIG_ENDIAN generally.
>> dnl AC_C_BIGENDIAN

> This would be a welcome change, indeed.

Ulrich


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emacs/ChangeLog entry:

2008-10-15  Ulrich Mueller  <ulm@gentoo.org>

	* configure.in: Add support for GNU/Linux on SuperH.

emacs/etc/ChangeLog entry:

2008-10-15  Ulrich Mueller  <ulm@gentoo.org>

	* MACHINES: Add section for SuperH.

emacs/src/ChangeLog entry:

2008-10-15  Ulrich Mueller  <ulm@gentoo.org>

	* m/sh3el.h: Restore deleted file for SuperH support.
	(WORD_MACHINE, NO_UNION_TYPE, EXPLICIT_SIGN_EXTEND)
	(LOAD_AVE_TYPE, LOAD_AVE_CVT, CANNOT_DUMP, VIRT_ADDR_VARIES)
	(HAVE_ALLOCA, NO_REMAP): Remove obsolete or unneeded definitions.
	* m/sh3eb.h: New file.


--- emacs-orig/configure.in	2008-08-28 22:31:27.000000000 +0200
+++ emacs/configure.in	2008-10-01 07:21:49.000000000 +0200
@@ -540,6 +540,16 @@
     machine=xtensa opsys=gnu-linux
     ;;
 
+  ## SuperH (little endian) Linux-based GNU system
+  sh[34]-*-linux-gnu* )
+    machine=sh3el opsys=gnu-linux
+  ;;
+
+  ## SuperH (big endian) Linux-based GNU system
+  sh[34]eb-*-linux-gnu* )
+    machine=sh3eb opsys=gnu-linux
+  ;;
+
   * )
     unported=yes
   ;;
--- emacs-orig/etc/MACHINES	2008-08-01 23:44:40.000000000 +0200
+++ emacs/etc/MACHINES	2008-10-01 07:22:52.000000000 +0200
@@ -426,6 +426,12 @@
   (now remapped as part of the text).  These are never
   swapped in.
 
+SuperH (sh[34]*-*-linux-gnu)
+
+  Emacs 23.0.60 was reported to work on GNU/Linux (October 2008).
+  Tested on a little-endian sh4 system (cpu type SH7751R) running
+  Gentoo Linux 2008.0.
+
 Tadpole 68K (m68k-tadpole-sysv)
 
   Changes merged in 19.1.
@@ -575,7 +581,6 @@
   PFU A-series (m/pfa50.h)
   Plexus running System V.2 (m/plexus.h)
   pyramid. (m/pyramid.h)
-  sh3el (m/sh3el.h)
   Bull SPS-7 (m/sps7.h)
   Hitachi SR2001/SR2201 (m/sr2k.h)
   Stride (m/stride.h)
--- emacs-orig/src/m/sh3eb.h	1970-01-01 01:00:00.000000000 +0100
+++ emacs/src/m/sh3eb.h	2008-10-01 07:20:54.000000000 +0200
@@ -0,0 +1,7 @@
+/* machine description file for big-endian SuperH. */
+
+#include "sh3el.h"
+#define WORDS_BIG_ENDIAN
+
+/* arch-tag: 86a90028-8f70-11dd-ac16-0012f098dd76
+   (do not change this comment) */
--- emacs-orig/src/m/sh3el.h	1970-01-01 01:00:00.000000000 +0100
+++ emacs/src/m/sh3el.h	2008-10-01 07:20:41.000000000 +0200
@@ -0,0 +1,31 @@
+/* machine description file for little-endian SuperH.
+   Copyright (C) 1985, 1986, 2006, 2007, 2008  Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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 of the License, or
+(at your option) any later version.
+
+GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+
+/* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
+   is the most significant byte.  */
+
+#undef WORDS_BIG_ENDIAN
+
+/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
+ * group of arguments and treat it as an array of the arguments.  */
+
+#define NO_ARG_ARRAY
+
+/* arch-tag: ee325990-6f40-47a2-b9df-60ecf3599899
+   (do not change this comment) */