Patchwork [moxie] bi-endian support for moxie

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Submitter Anthony Green
Date Sept. 13, 2012, 11:33 p.m.
Message ID <CACxje5-5Nug_7TnP5x-kWPHm6itgqYXXRY6XNQy6_wRgfYoewQ@mail.gmail.com>
Download mbox | patch
Permalink /patch/183766/
State New
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Comments

Anthony Green - Sept. 13, 2012, 11:33 p.m.
Here are some changes in support of a little-endian soft-core
implementation of moxie.   We now build multilibs for both endians.
Corresponding binutils changes have already been committed and I am
checking this in.  (note: it does include  what I believe are
trivially correct doc changes - apologies in advance if I should have
waited for a review).

Thanks,

Anthony Green



2012-09-13  Anthony Green  <green@moxielogic.com>

	* config/moxie/moxie.h (LINK_SPEC): Add bi-endian support.
	(MULTILIB_DEFAULTS): Define.
	(ASM_SPEC): Define.
	(BYTES_BIG_ENDIAN, WORDS_BIG_ENDIAN): Add bi-endian support.
	(TARGET_CPU_CPP_BUILTINS): Add __MOXIE_LITTLE_ENDIAN__ and
	__MOXIE_BIG_ENDIAN__.
	* config/moxie/t-moxie (MULTILIB_DIRNAMES, MULTILIB_OPTIONS):
	Define.
	* config/moxie/moxie.opt: New file.
	* doc/invoke.texi (Moxie Options): Add section documenting -mel
	and -meb.

Patch

Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi	(revision 191083)
+++ gcc/doc/invoke.texi	(working copy)
@@ -776,6 +776,9 @@ 
 -mreturn-pointer-on-d0 @gol
 -mno-crt0  -mrelax -mliw -msetlb}

+@emph{Moxie Options}
+@gccoptlist{-meb  -mel}
+
 @emph{PDP-11 Options}
 @gccoptlist{-mfpu  -msoft-float  -mac0  -mno-ac0  -m40  -m45  -m10 @gol
 -mbcopy  -mbcopy-builtin  -mint32  -mno-int16 @gol
@@ -10514,6 +10517,7 @@ 
 * MIPS Options::
 * MMIX Options::
 * MN10300 Options::
+* Moxie Options::
 * PDP-11 Options::
 * picoChip Options::
 * PowerPC Options::
@@ -16433,6 +16437,23 @@ 

 @end table

+@node Moxie Options
+@subsection Moxie Options
+@cindex Moxie Options
+
+@table @gcctabopt
+
+@item -meb
+@opindex meb
+Generate big-endian code.  This is the default for @samp{moxie-*-*}
+configurations.
+
+@item -mel
+@opindex mel
+Generate little-endian code.
+
+@end table
+
 @node PDP-11 Options
 @subsection PDP-11 Options
 @cindex PDP-11 Options
Index: gcc/config/moxie/moxie.h
===================================================================
--- gcc/config/moxie/moxie.h	(revision 191083)
+++ gcc/config/moxie/moxie.h	(working copy)
@@ -41,9 +41,13 @@ 
 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"

 #undef  LINK_SPEC
-#define LINK_SPEC "%{h*} %{v:-V} \
+#define LINK_SPEC "%{h*} %{v:-V} %{!mel:-EB} %{mel:-EL}\
 		   %{static:-Bstatic} %{shared:-shared} %{symbolic:-Bsymbolic}"

+#ifndef MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS { "meb" }
+#endif
+
 /* Layout of Source Language Data Types */

 #define INT_TYPE_SIZE 32
@@ -192,6 +196,7 @@ 
 /* The Overall Framework of an Assembler File */

 #undef  ASM_SPEC
+#define ASM_SPEC "%{!mel:-EB} %{mel:-EL}"
 #define ASM_COMMENT_START "#"
 #define ASM_APP_ON ""
 #define ASM_APP_OFF ""
@@ -291,8 +296,8 @@ 
 /* Storage Layout */

 #define BITS_BIG_ENDIAN 0
-#define BYTES_BIG_ENDIAN 1
-#define WORDS_BIG_ENDIAN 1
+#define BYTES_BIG_ENDIAN ( ! TARGET_LITTLE_ENDIAN )
+#define WORDS_BIG_ENDIAN ( ! TARGET_LITTLE_ENDIAN )

 /* Alignment required for a function entry point, in bits.  */
 #define FUNCTION_BOUNDARY 16
@@ -473,8 +478,12 @@ 

 #define TARGET_CPU_CPP_BUILTINS() \
   { \
-    builtin_define_std ("moxie");		\
-    builtin_define_std ("MOXIE");		\
+    builtin_define_std ("moxie");			\
+    builtin_define_std ("MOXIE");			\
+    if (TARGET_LITTLE_ENDIAN)				\
+      builtin_define ("__MOXIE_LITTLE_ENDIAN__");	\
+    else						\
+      builtin_define ("__MOXIE_BIG_ENDIAN__");		\
   }

 #define HAS_LONG_UNCOND_BRANCH true
Index: gcc/config/moxie/t-moxie
===================================================================
--- gcc/config/moxie/t-moxie	(revision 191083)
+++ gcc/config/moxie/t-moxie	(working copy)
@@ -18,3 +18,6 @@ 
 # along with GCC; see the file COPYING3.  If not see
 # <http://www.gnu.org/licenses/>.

+MULTILIB_OPTIONS     = meb/mel
+MULTILIB_DIRNAMES    = eb el
+
Index: gcc/config/moxie/moxie.opt
===================================================================
--- gcc/config/moxie/moxie.opt	(revision 0)
+++ gcc/config/moxie/moxie.opt	(working copy)
@@ -0,0 +1,27 @@ 
+; Options for the moxie compiler port.
+
+; Copyright (C) 2012 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/>.
+
+meb
+Target RejectNegative Report InverseMask(LITTLE_ENDIAN)
+Generate big-endian code
+
+mel
+Target RejectNegative Report Mask(LITTLE_ENDIAN)
+Generate little-endian code