Patch from Phillip Blundell <pb@nexus.co.uk> to add arm/thumb uclinux support.

From-SVN: r28312

gcc/ChangeLog

+1999-07-27  Philip Blundell  <pb@nexus.co.uk>
+
+	* config/arm/telf.h: Include dbxelf.h.
+ 	(CPP_PREDEFINES): Only define if not already defined.
+	(ASM_IDENTIFY_GCC): Likewise.
+	(SUBTARGET_EXTRA_SECTIONS): Likewise.
+	(SUBTARGET_EXTRA_SECTION_FUNCTIONS): Likewise.
+	* config/arm/thumb.h (LINK_SPEC): Only define if not already
+	defined.
+	(DBX_DEBUGGING_INFO): Don't define.
+	* config/arm/linux-telf.h: New file.
+	* config/arm/linux-tgas.h: New file.
+	* config/arm/t-thumb-linux: New file.
+	* config/arm/uclinux-elf.h: New file.
+	* config/arm/uclinux-telf.h: New file.
+	* configure.in (arm-*-uclinux, thumb-*-linux-gnu,
+	thumb-*-uclinux): New targets.
+	* configure: Regenerate.
+
 Tue Jul 27 23:20:21 1999  Jeffrey A Law  (law@cygnus.com)
 
 	* pa.md (post_store, pre_load): New expanders.

gcc/config/arm/linux-telf.h

+/* Definitions for Thumb running Linux-based GNU systems using ELF
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <philb@gnu.org>
+
+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 this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* We have libgcc2.  */
+#define HAVE_ATEXIT
+
+#define SUBTARGET_EXTRA_ASM_SPEC	\
+	" %{fPIC:-k} %{fpic:-k}"
+
+/* This was defined in linux.h.  Define it here also. */
+#undef  DEFAULT_VTABLE_THUNKS
+#define DEFAULT_VTABLE_THUNKS   1
+
+/* Handle #pragma weak and #pragma pack.  */
+#define HANDLE_SYSV_PRAGMA
+
+/* Now we define the strings used to build the spec file.  */
+#define LIB_SPEC \
+  "%{shared: -lc} \
+   %{!shared: %{pthread:-lpthread} \
+	%{profile:-lc_p} %{!profile: -lc}}"
+
+/* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
+   the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
+   provides part of the support for getting C++ file-scope static
+   object constructed before entering `main'. */
+   
+#define STARTFILE_SPEC \
+  "%{!shared: \
+     %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
+		       %{!p:%{profile:gcrt1.o%s} \
+			 %{!profile:crt1.o%s}}}} \
+   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
+
+/* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
+   the GNU/Linux magical crtend.o file (see crtstuff.c) which
+   provides part of the support for getting C++ file-scope static
+   object constructed before entering `main', followed by a normal
+   GNU/Linux "finalizer" file, `crtn.o'.  */
+
+#define ENDFILE_SPEC \
+  "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
+
+#define LINK_SPEC "%{h*} %{version:-v} \
+   %{b} %{Wl,*:%*} \
+   %{static:-Bstatic} \
+   %{shared:-shared} \
+   %{symbolic:-Bsymbolic} \
+   %{rdynamic:-export-dynamic} \
+   %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
+   -X -mno-fpu -p \
+   %{mbig-endian:-EB} \
+   -m armelf_linux"
+
+#define CPP_PREDEFINES \
+  "-Dunix -Dthumb -D__thumb -Dlinux \
+-Asystem(unix) -Asystem(posix) -Acpu(arm) \
+-Amachine(arm) -D__ELF__"
+
+/* Allow #sccs in preprocessor.  */
+#define SCCS_DIRECTIVE
+
+#define USER_LABEL_PREFIX 	""	/* For ELF the default is no underscores */
+#define LOCAL_LABEL_PREFIX 	"."
+
+/* Attach a special .ident directive to the end of the file to identify
+   the version of GCC which compiled this code.  */
+#define IDENT_ASM_OP 	".ident"
+
+/* Output #ident as a .ident.  */
+#define ASM_OUTPUT_IDENT(FILE, NAME) \
+  fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
+  
+#ifdef IDENTIFY_WITH_IDENT
+#define ASM_IDENTIFY_GCC(FILE) /* nothing */
+#define ASM_IDENTIFY_LANGUAGE(FILE)			\
+ fprintf (FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP,	\
+	 lang_identify (), version_string)
+#else
+#define ASM_FILE_END(FILE)				\
+  do							\
+    {				 			\
+      if (!flag_no_ident)				\
+	fprintf (FILE, "\t%s\t\"GCC: (GNU) %s\"\n",	\
+		 IDENT_ASM_OP, version_string);		\
+    }							\
+  while (0)
+#endif
+
+/* Support const sections and the ctors and dtors sections for g++.
+   Note that there appears to be two different ways to support const
+   sections at the moment.  You can either #define the symbol
+   READONLY_DATA_SECTION (giving it some code which switches to the
+   readonly data section) or else you can #define the symbols
+   EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
+   SELECT_RTX_SECTION.  We do both here just to be on the safe side.  */
+#define USE_CONST_SECTION	1
+
+/* Support for Constructors and Destructors.  */
+#define READONLY_DATA_SECTION() const_section ()
+
+/* A default list of other sections which we might be "in" at any given
+   time.  For targets that use additional sections (e.g. .tdesc) you
+   should override this definition in the target-specific file which
+   includes this file.  */
+#define SUBTARGET_EXTRA_SECTIONS in_const,
+
+/* A default list of extra section function definitions.  For targets
+   that use additional sections (e.g. .tdesc) you should override this
+   definition in the target-specific file which includes this file.  */
+#define SUBTARGET_EXTRA_SECTION_FUNCTIONS	CONST_SECTION_FUNCTION
+
+extern void text_section ();
+
+#define CONST_SECTION_ASM_OP	".section\t.rodata"
+
+#define CONST_SECTION_FUNCTION						\
+void									\
+const_section ()							\
+{									\
+  if (!USE_CONST_SECTION)						\
+    text_section ();							\
+  else if (in_section != in_const)					\
+    {									\
+      fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);		\
+      in_section = in_const;						\
+    }									\
+}
+
+/* A C statement or statements to switch to the appropriate
+   section for output of DECL.  DECL is either a `VAR_DECL' node
+   or a constant of some sort.  RELOC indicates whether forming
+   the initial value of DECL requires link-time relocations.  */
+#define SELECT_SECTION(DECL, RELOC)					\
+{									\
+  if (TREE_CODE (DECL) == STRING_CST)					\
+    {									\
+      if (! flag_writable_strings)					\
+	const_section ();						\
+      else								\
+	data_section ();						\
+    }									\
+  else if (TREE_CODE (DECL) == VAR_DECL)				\
+    {									\
+      if ((flag_pic && RELOC)						\
+	  || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)		\
+	  || !DECL_INITIAL (DECL)					\
+	  || (DECL_INITIAL (DECL) != error_mark_node			\
+	      && !TREE_CONSTANT (DECL_INITIAL (DECL))))			\
+	data_section ();						\
+      else								\
+	const_section ();						\
+    }									\
+  else									\
+    const_section ();							\
+}
+
+/* A C statement or statements to switch to the appropriate
+   section for output of RTX in mode MODE.  RTX is some kind
+   of constant in RTL.  The argument MODE is redundant except
+   in the case of a `const_int' rtx.  Currently, these always
+   go into the const section.  */
+#define SELECT_RTX_SECTION(MODE, RTX) const_section ()
+
+/* On svr4, we *do* have support for the .init and .fini sections, and we
+   can put stuff in there to be executed before and after `main'.  We let
+   crtstuff.c and other files know this by defining the following symbols.
+   The definitions say how to change sections to the .init and .fini
+   sections.  This is the same for all known svr4 assemblers.  */
+#define INIT_SECTION_ASM_OP	".section\t.init"
+#define FINI_SECTION_ASM_OP	".section\t.fini"
+
+
+/* This is how we tell the assembler that a symbol is weak.  */
+#define ASM_WEAKEN_LABEL(FILE, NAME) 		\
+  do						\
+    {						\
+      fputs ("\t.weak\t", FILE);		\
+      assemble_name (FILE, NAME); 		\
+      fputc ('\n', FILE);			\
+    }						\
+  while (0)
+
+#include "arm/telf.h"
+#include "arm/linux-tgas.h"
+
+/* Run-time Target Specification.  */
+#undef TARGET_VERSION
+#define TARGET_VERSION  fputs (" (Thumb GNU/Linux)", stderr);

gcc/config/arm/linux-tgas.h

+/* Definitions of target machine for GNU compiler.
+   Thumb Linux-based GNU systems version.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Contributed by Russell King  <rmk92@ecs.soton.ac.uk>.
+
+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 this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* We are using GAS, so stabs should work.  */
+#ifndef DBX_DEBUGGING_INFO
+#define DBX_DEBUGGING_INFO 1
+#endif
+
+/* This is how we tell the assembler that a symbol is weak.
+   GAS always supports weak symbols.  */
+#define ASM_WEAKEN_LABEL(FILE, NAME) 		\
+  do						\
+    {						\
+      fputs ("\t.weak\t", FILE);		\
+      assemble_name (FILE, NAME); 		\
+      fputc ('\n', FILE);			\
+    }						\
+  while (0)
+
+/* This is used in ASM_FILE_START */
+#undef  ARM_OS_NAME
+#define ARM_OS_NAME "Linux"
+
+/* Unsigned chars produces much better code than signed.  */
+#define DEFAULT_SIGNED_CHAR 0
+
+#undef  SUBTARGET_CPP_SPEC
+#define SUBTARGET_CPP_SPEC  "%{posix:-D_POSIX_SOURCE} %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__}"
+
+#undef  SIZE_TYPE
+#define SIZE_TYPE "unsigned int"
+
+#undef  PTRDIFF_TYPE
+#define PTRDIFF_TYPE "int"
+
+#undef  WCHAR_TYPE
+#define WCHAR_TYPE "long int"
+
+#undef  WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE BITS_PER_WORD
+
+/* Emit code to set up a trampoline and synchronise the caches.  */
+#undef  INITIALIZE_TRAMPOLINE
+#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			\
+{									\
+  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 8)),	\
+		  CXT);							\
+  emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 12)),	\
+		  FNADDR);						\
+  emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"),	\
+		     0, VOIDmode, 2, TRAMP, Pmode,			\
+		     plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);	\
+}
+
+#if 0
+/* Clear the instruction cache from `beg' to `end'.  This makes an
+   inline system call to SYS_cacheflush.  */
+#define CLEAR_INSN_CACHE(BEG, END)					\
+{									\
+  register unsigned long _beg __asm ("a1") = (unsigned long) (BEG);	\
+  register unsigned long _end __asm ("a2") = (unsigned long) (END);	\
+  register unsigned long _flg __asm ("a3") = 0;				\
+  __asm __volatile ("swi 0x9f0002");					\
+}
+#endif

gcc/config/arm/t-thumb-linux

+# Just for these, we omit the frame pointer since it makes such a big
+# difference.  It is then pointless adding debugging.
+TARGET_LIBGCC2_CFLAGS = -fomit-frame-pointer -fPIC
+LIBGCC2_DEBUG_CFLAGS = -g0
+
+# Don't build enquire
+ENQUIRE=
+
+# Since libgcc1 is an assembler file, we can build it automatically for the
+# cross-compiler.
+CROSS_LIBGCC1 = libgcc1-asm.a
+LIBGCC1 = libgcc1-asm.a
+LIB1ASMSRC = arm/lib1thumb.asm
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3  _dvmd_tls _call_via_rX _interwork_call_via_rX
+
+MULTILIB_OPTIONS     = mlittle-endian/mbig-endian
+MULTILIB_DIRNAMES    = le be
+MULTILIB_MATCHES     = mbig-endian=mbe mlittle-endian=mle
+EXTRA_MULTILIB_PARTS = crtbegin.o crtend.o
+
+LIBGCC = stmp-multilib
+INSTALL_LIBGCC = install-multilib
+
+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
+

gcc/config/arm/telf.h

@@ -21,7 +21,9 @@ Boston, MA 02111-1307, USA.  */
 
 #define OBJECT_FORMAT_ELF
 
+#ifndef CPP_PREDEFINES
 #define CPP_PREDEFINES "-Dthumb -Dthumbelf -D__thumb -Acpu(arm) -Amachine(arm)"
+#endif
 
 #include "arm/thumb.h"
 
@@ -45,6 +47,8 @@ extern int arm_structure_size_boundary;
 #define DWARF2_DEBUGGING_INFO
 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 
+/* Get the standard ELF stabs definitions.  */
+#include "dbxelf.h"
 
 /* Note - it is important that these definitions match those in semi.h for the ARM port.  */
 #undef  LOCAL_LABEL_PREFIX
@@ -54,8 +58,10 @@ extern int arm_structure_size_boundary;
 /* A C statement to output assembler commands which will identify the
    object file as having been compiled with GNU CC (or another GNU
    compiler).  */
+#ifndef ASM_IDENTIFY_GCC
 #define ASM_IDENTIFY_GCC(STREAM)				\
   fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
+#endif
 
 #undef  ASM_FILE_START
 #define ASM_FILE_START(STREAM)						\
@@ -189,7 +195,9 @@ extern int arm_structure_size_boundary;
 #undef  EXTRA_SECTIONS
 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
 
+#ifndef SUBTARGET_EXTRA_SECTIONS
 #define SUBTARGET_EXTRA_SECTIONS
+#endif
 
 /* A list of extra section function definitions.  */
 
@@ -200,7 +208,9 @@ extern int arm_structure_size_boundary;
   DTORS_SECTION_FUNCTION	\
   SUBTARGET_EXTRA_SECTION_FUNCTIONS
 
+#ifndef SUBTARGET_EXTRA_SECTION_FUNCTIONS
 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
+#endif
 
 #define RDATA_SECTION_FUNCTION \
 void									\

gcc/config/arm/thumb.h

@@ -50,7 +50,9 @@ Boston, MA 02111-1307, USA.  */
 #endif
 
 #define ASM_SPEC "-marm7tdmi %{mthumb-interwork:-mthumb-interwork} %{mbig-endian:-EB}"
+#ifndef LINK_SPEC
 #define LINK_SPEC "%{mbig-endian:-EB} -X"
+#endif
 
 #define TARGET_VERSION  fputs (" (ARM/THUMB:generic)", stderr);
 
@@ -1238,8 +1240,6 @@ extern int making_const_table;
 
 /* Specific options for DBX Output */
 
-#define DBX_DEBUGGING_INFO 1
-
 #define DEFAULT_GDB_EXTENSIONS 1
 
 

gcc/config/arm/uclinux-elf.h

+/* Definitions for ARM running ucLinux using ELF
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <pb@nexus.co.uk>
+
+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 this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "arm/linux-elf.h"
+
+/* We don't want a PLT.  */
+#undef  NEED_PLT_RELOC
+#define NEED_PLT_RELOC 0
+
+#undef  TARGET_VERSION
+#define TARGET_VERSION fputs (" (ARM/ELF ucLinux)", stderr);
+
+#undef  TARGET_DEFAULT
+#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE | ARM_FLAG_SINGLE_PIC_BASE)

gcc/config/arm/uclinux-telf.h

+/* Definitions for Thumb running ucLinux using ELF
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <pb@nexus.co.uk>
+
+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 this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "arm/linux-telf.h"
+
+#undef  TARGET_VERSION
+#define TARGET_VERSION fputs (" (Thumb/ELF ucLinux)", stderr);
+
+#undef  TARGET_DEFAULT
+#define TARGET_DEFAULT (THUMB_FLAG_SINGLE_PIC_BASE)
+
+/* We don't want a PLT.  */
+#undef  NEED_PLT_RELOC
+#define NEED_PLT_RELOC 0
+
+/* On svr4, we *do* have support for the .init and .fini sections, and we
+   can put stuff in there to be executed before and after `main'.  We let
+   crtstuff.c and other files know this by defining the following symbols.
+   The definitions say how to change sections to the .init and .fini
+   sections.  This is the same for all known svr4 assemblers.  */
+#define INIT_SECTION_ASM_OP	".section\t.init"
+#define FINI_SECTION_ASM_OP	".section\t.fini"

gcc/configure

@@ -3203,6 +3203,10 @@ for machine in $build $host $target; do
 			;;
 		esac
 		;;
+	arm*-*-uclinux*)		# ARM ucLinux
+		tm_file=arm/uclinux-elf.h
+		tmake_file=arm/t-arm-elf
+		;;
 	arm*-*-aout)
 		tm_file=arm/aout.h
 		tmake_file=arm/t-bare
@@ -5601,6 +5605,20 @@ for machine in $build $host $target; do
 		md_file=arm/thumb.md
 		tmake_file=arm/t-thumb-elf
 		;;
+	thumb-*-linux-gnu*)
+		tm_file=arm/linux-telf.h
+		out_file=arm/thumb.c
+		xm_file=arm/xm-thumb.h
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb-linux
+		;;
+	thumb-*-uclinux*)
+		tm_file=arm/uclinux-telf.h
+		out_file=arm/thumb.c
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb-linux
+		xm_file=arm/xm-thumb.h
+		;;
 	thumb-wrs-vxworks)
 		tm_file=arm/tcoff.h
 		out_file=arm/thumb.c

gcc/configure.in

@@ -776,6 +776,10 @@ changequote([,])dnl
 			;;
 		esac
 		;;
+	arm*-*-uclinux*)		# ARM ucLinux
+		tm_file=arm/uclinux-elf.h
+		tmake_file=arm/t-arm-elf
+		;;
 	arm*-*-aout)
 		tm_file=arm/aout.h
 		tmake_file=arm/t-bare
@@ -3300,6 +3304,20 @@ changequote([,])dnl
 		md_file=arm/thumb.md
 		tmake_file=arm/t-thumb-elf
 		;;
+	thumb-*-linux-gnu*)
+		tm_file=arm/linux-telf.h
+		out_file=arm/thumb.c
+		xm_file=arm/xm-thumb.h
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb-linux
+		;;
+	thumb-*-uclinux*)
+		tm_file=arm/uclinux-telf.h
+		out_file=arm/thumb.c
+		md_file=arm/thumb.md
+		tmake_file=arm/t-thumb-linux
+		xm_file=arm/xm-thumb.h
+		;;
 	thumb-wrs-vxworks)
 		tm_file=arm/tcoff.h
 		out_file=arm/thumb.c