Add support for ARM's Thumb instruction set.

From-SVN: r18822

ChangeLog

+Wed Mar 25 10:04:18 1998  Nick Clifton  <nickc@cygnus.com>
+
+	* configure.in: Add thumb-coff target.
+	* config.sub: Add thumb-coff target.
+
 Fri Mar 20 09:32:14 1998  Manfred Hollstein  <manfred@s-direktnet.de>
 
 	* Makefile.in (install-gcc): Don't specify LANGUAGES here.

config.sub

@@ -173,6 +173,9 @@ case $basic_machine in
 	m88110 | m680[01234]0 | m683?2 | m68360 | z8k | v70 | h8500 | w65) # CYGNUS LOCAL
 		basic_machine=$basic_machine-unknown
 		;;
+	thumb)
+		basic_machine=$basic_machine-unknown
+		;;
 	mips64vr4300 | mips64vr4300el) # CYGNUS LOCAL jsmith/vr4300
 		basic_machine=$basic_machine-unknown
 		;;
@@ -216,6 +219,8 @@ case $basic_machine in
 		;;
 	m88110-* | m680[01234]0-* | m683?2-* | m68360-* | z8k-* | h8500-* | d10v-*) # CYGNUS LOCAL
 		;;
+	thumb-*)
+		;;
 	mips64vr4300-* | mips64vr4300el-*) # CYGNUS LOCAL jsmith/vr4300
 		;;
 	mips64vr4100-* | mips64vr4100el-*) # CYGNUS LOCAL jsmith/vr4100

configure.in

@@ -540,6 +540,9 @@ case "${target}" in
   arm-*-riscix*)
     noconfigdirs="$noconfigdirs ld target-libgloss"
     ;;
+  thumb-*-coff)
+    noconfigdirs="$noconfigdirs target-libgloss"
+    ;;
   d10v-*-*)
     noconfigdirs="$noconfigdirs target-librx target-libg++ target-libstdc++ target-libio target-libgloss"
     ;;

gcc/ChangeLog

+Wed Mar 25 10:05:19 1998  Nick Clifton  <nickc@cygnus.com>
+
+	* config/arm/thumb.c: New File.  Support for ARM's Thumb
+	instruction set. 
+	* config/arm/thumb.h: New File.  Thumb definitions.
+	* config/arm/thumb.md: New File.  Thumb machine description.
+	* config/arm/tcoff.h: New File.  Thumb COFF support.
+	* config/arm/t-thumb: New File.  Thumb makefile fragment.
+	* config/arm/lib1thumb.asm: New File.  Thumb libgcc support functions.
+
+	* configure.in: Add Thumb-coff target.
+	* configure: Add Thumb-coff target.
+	* config.sub: Add Thumb-coff target.
+
 Wed Mar 25 10:30:32 1998  Jim Wilson  <wilson@cygnus.com>
 
 	* loop.c (scan_loop): Initialize move_insn_first to zero.

gcc/config.sub

@@ -159,6 +159,9 @@ case $basic_machine in
 		| sparc | sparclet | sparclite | sparc64 | v850)
 		basic_machine=$basic_machine-unknown
 		;;
+	thumb | thumbel)
+		basic_machine=$basic_machine-unknown
+		;;
 	# We use `pc' rather than `unknown'
 	# because (1) that's what they normally are, and
 	# (2) the word "unknown" tends to confuse beginning users.

gcc/config/arm/t-thumb

+CROSS_LIBGCC1 = libgcc1-asm.a
+LIB1ASMSRC = arm/lib1thumb.asm
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_tls _call_via_rX
+# adddi3/subdi3 added to machine description
+#LIB1ASMFUNCS = _adddi3 _subdi3 _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_tls
+
+# These are really part of libgcc1, but this will cause them to be
+# built correctly, so...
+
+LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c
+
+fp-bit.c: $(srcdir)/config/fp-bit.c
+	echo '#define FLOAT' > fp-bit.c
+	echo '#ifndef __ARMEB__' >> fp-bit.c
+	echo '#define FLOAT_BIT_ORDER_MISMATCH' >> fp-bit.c
+	echo '#endif' >> fp-bit.c
+	cat $(srcdir)/config/fp-bit.c >> fp-bit.c
+
+dp-bit.c: $(srcdir)/config/fp-bit.c
+	echo '#ifndef __ARMEB__' > dp-bit.c
+	echo '#define FLOAT_BIT_ORDER_MISMATCH' >> dp-bit.c
+	echo '#define FLOAT_WORD_ORDER_MISMATCH' >> dp-bit.c
+	echo '#endif' >> dp-bit.c
+	cat $(srcdir)/config/fp-bit.c >> dp-bit.c
+
+# Avoid building a duplicate set of libraries for the default endian-ness.
+MULTILIB_OPTIONS = mlittle-endian/mbig-endian mno-thumb-interwork/mthumb-interwork
+MULTILIB_DIRNAMES = le be normal interwork
+MULTILIB_MATCHES = mbig-endian=mbe mlittle-endian=mle
+
+LIBGCC = stmp-multilib
+INSTALL_LIBGCC = install-multilib

gcc/config/arm/tcoff.h

+/* Definitions of target machine for GNU compiler,
+   for Thumb with COFF obj format.
+   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   Derived from arm/coff.h originally by Doug Evans (dje@cygnus.com).
+   
+This file is part of GNU CC.
+
+GNU CC 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 2, or (at your option)
+any later version.
+
+GNU CC 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 CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "arm/thumb.h"
+
+/* Run-time Target Specification.  */
+#undef TARGET_VERSION
+#define TARGET_VERSION fputs (" (Thumb/coff)", stderr)
+
+#define MULTILIB_DEFAULTS { "mlittle-endian" }
+
+/* Setting this to 32 produces more efficient code, but the value set in previous
+   versions of this toolchain was 8, which produces more compact structures. The
+   command line option -mstructure_size_boundary=<n> can be used to change this
+   value.  */
+#undef STRUCTURE_SIZE_BOUNDARY
+#define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary
+
+extern int arm_structure_size_boundary;
+
+/* This is COFF, but prefer stabs.  */
+#define SDB_DEBUGGING_INFO
+
+#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
+
+#include "dbxcoff.h"
+
+/* Note - it is important that these definitions match those in semi.h for the ARM port.  */
+#undef LOCAL_LABEL_PREFIX
+#define LOCAL_LABEL_PREFIX "."
+
+#undef USER_LABEL_PREFIX
+#define USER_LABEL_PREFIX "_"
+
+/* A C statement to output assembler commands which will identify the
+   object file as having been compiled with GNU CC (or another GNU
+   compiler).  */
+#define ASM_IDENTIFY_GCC(STREAM)				\
+     fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
+
+#undef ASM_FILE_START
+#define ASM_FILE_START(STREAM) \
+do {								\
+  extern char *version_string;					\
+  fprintf ((STREAM), "%s Generated by gcc %s for Thumb/coff\n", \
+	   ASM_COMMENT_START, version_string);	                \
+  fprintf ((STREAM), ASM_APP_OFF);                              \
+} while (0)
+
+/* A C statement to output something to the assembler file to switch to section
+   NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
+   NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
+   define this macro in such cases.  */
+#define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
+do {								\
+  if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)		\
+    fprintf (STREAM, "\t.section %s,\"x\"\n", (NAME));		\
+  else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))	\
+    fprintf (STREAM, "\t.section %s,\"\"\n", (NAME));		\
+  else								\
+    fprintf (STREAM, "\t.section %s,\"w\"\n", (NAME));		\
+} while (0)
+
+/* Support the ctors/dtors and other sections.  */
+
+#undef INIT_SECTION_ASM_OP
+
+/* Define this macro if jump tables (for `tablejump' insns) should be
+   output in the text section, along with the assembler instructions.
+   Otherwise, the readonly data section is used.  */
+#define JUMP_TABLES_IN_TEXT_SECTION
+
+#undef READONLY_DATA_SECTION
+#define READONLY_DATA_SECTION	rdata_section
+#undef RDATA_SECTION_ASM_OP
+#define RDATA_SECTION_ASM_OP	"\t.section .rdata"
+
+#undef CTORS_SECTION_ASM_OP
+#define CTORS_SECTION_ASM_OP	"\t.section .ctors,\"x\""
+#undef DTORS_SECTION_ASM_OP
+#define DTORS_SECTION_ASM_OP	"\t.section .dtors,\"x\""
+
+/* A list of other sections which the compiler might be "in" at any
+   given time.  */
+
+#undef EXTRA_SECTIONS
+#define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
+
+#define SUBTARGET_EXTRA_SECTIONS
+
+/* A list of extra section function definitions.  */
+
+#undef EXTRA_SECTION_FUNCTIONS
+#define EXTRA_SECTION_FUNCTIONS \
+  RDATA_SECTION_FUNCTION	\
+  CTORS_SECTION_FUNCTION	\
+  DTORS_SECTION_FUNCTION	\
+  SUBTARGET_EXTRA_SECTION_FUNCTIONS
+
+#define SUBTARGET_EXTRA_SECTION_FUNCTIONS
+
+#define RDATA_SECTION_FUNCTION \
+void									\
+rdata_section ()							\
+{									\
+  if (in_section != in_rdata)						\
+    {									\
+      fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);		\
+      in_section = in_rdata;						\
+    }									\
+}
+
+#define CTORS_SECTION_FUNCTION \
+void									\
+ctors_section ()							\
+{									\
+  if (in_section != in_ctors)						\
+    {									\
+      fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);		\
+      in_section = in_ctors;						\
+    }									\
+}
+
+#define DTORS_SECTION_FUNCTION \
+void									\
+dtors_section ()							\
+{									\
+  if (in_section != in_dtors)						\
+    {									\
+      fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);		\
+      in_section = in_dtors;						\
+    }									\
+}
+
+/* Support the ctors/dtors sections for g++.  */
+
+#define INT_ASM_OP ".word"
+
+/* A C statement (sans semicolon) to output an element in the table of
+   global constructors.  */
+#undef ASM_OUTPUT_CONSTRUCTOR
+#define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
+do {						\
+  ctors_section ();				\
+  fprintf (STREAM, "\t%s\t ", INT_ASM_OP);	\
+  assemble_name (STREAM, NAME);			\
+  fprintf (STREAM, "\n");			\
+} while (0)
+
+/* A C statement (sans semicolon) to output an element in the table of
+   global destructors.  */
+#undef ASM_OUTPUT_DESTRUCTOR
+#define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
+do {						\
+  dtors_section ();                   		\
+  fprintf (STREAM, "\t%s\t ", INT_ASM_OP);	\
+  assemble_name (STREAM, NAME);              	\
+  fprintf (STREAM, "\n");			\
+} while (0)
+
+/* __CTOR_LIST__ and __DTOR_LIST__ must be defined by the linker script.  */
+#define CTOR_LISTS_DEFINED_EXTERNALLY
+
+#undef DO_GLOBAL_CTORS_BODY
+#undef DO_GLOBAL_DTORS_BODY
+
+/* The ARM development system has atexit and doesn't have _exit,
+   so define this for now.  */
+#define HAVE_ATEXIT
+
+/* The ARM development system defines __main.  */
+#define NAME__MAIN "__gccmain"
+#define SYMBOL__MAIN __gccmain

gcc/configure

@@ -4168,6 +4168,13 @@ for machine in $build $host $target; do
 #		;;
 #	tahoe-*-bsd*)			# tahoe running BSD
 #		;;
+	thumb-*-coff* | thumbel-*-coff*)
+		tm_file=arm/tcoff.h
+		out_file=arm/thumb.c
+		xm_file=arm/xm-thumb.h
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb
+		;;
 # This hasn't been upgraded to GCC 2.
 #	tron-*-*)
 #		cpu_type=gmicro
@@ -4445,7 +4452,8 @@ then extra_headers=; fi
 if [ x"$xm_file" = x ]
 then xm_file=$cpu_type/xm-$cpu_type.h; fi
 
-md_file=$cpu_type/$cpu_type.md
+if [ x$md_file = x ]
+then md_file=$cpu_type/$cpu_type.md; fi
 
 if [ x$out_file = x ]
 then out_file=$cpu_type/$cpu_type.c; fi

gcc/configure.in

@@ -2485,6 +2485,13 @@ for machine in $build $host $target; do
 #		;;
 #	tahoe-*-bsd*)			# tahoe running BSD
 #		;;
+	thumb-*-coff* | thumbel-*-coff*)
+		tm_file=arm/tcoff.h
+		out_file=arm/thumb.c
+		xm_file=arm/xm-thumb.h
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb
+		;;
 # This hasn't been upgraded to GCC 2.
 #	tron-*-*)
 #		cpu_type=gmicro
@@ -2762,7 +2769,8 @@ then extra_headers=; fi
 if [[ x"$xm_file" = x ]]
 then xm_file=$cpu_type/xm-$cpu_type.h; fi
 
-md_file=$cpu_type/$cpu_type.md
+if [[ x$md_file = x ]]
+then md_file=$cpu_type/$cpu_type.md; fi
 
 if [[ x$out_file = x ]]
 then out_file=$cpu_type/$cpu_type.c; fi