Add support for thumb-elf target.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@27490 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 323 insertions, 0 deletions

diff --git a/gcc/config/arm/t-thumb-elf b/gcc/config/arm/t-thumb-elf
new file mode 100644
index 00000000000..3e608ab1c80
--- /dev/null
+++ b/gcc/config/arm/t-thumb-elf
@@ -0,0 +1,34 @@
+CROSS_LIBGCC1 = libgcc1-asm.a
+LIB1ASMSRC = arm/lib1thumb.asm
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_tls _call_via_rX _interwork_call_via_rX
+# adddi3/subdi3 added to machine description
+
+# 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 fno-leading-underscore/fleading-underscore
+MULTILIB_DIRNAMES    = le be normal interwork elf under
+MULTILIB_MATCHES     = mbig-endian=mbe mlittle-endian=mle
+EXTRA_MULTILIB_PARTS = crtbegin.o crtend.o
+
+LIBGCC = stmp-multilib
+INSTALL_LIBGCC = install-multilib
+
+TARGET_LIBGCC2_CFLAGS = -Dinhibit_libc
diff --git a/gcc/config/arm/telf.h b/gcc/config/arm/telf.h
new file mode 100644
index 00000000000..69604a204db
--- /dev/null
+++ b/gcc/config/arm/telf.h
@@ -0,0 +1,289 @@
+/* Definitions of target machine for GNU compiler,
+   for Thumb with ELF obj format.
+   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   
+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.  */
+
+#define OBJECT_FORMAT_ELF
+
+#define CPP_PREDEFINES "-Dthumb -Dthumbelf -D__thumb -Acpu(arm) -Amachine(arm)"
+
+#include "arm/thumb.h"
+
+/* Run-time Target Specification.  */
+#undef  TARGET_VERSION
+#define TARGET_VERSION fputs (" (Thumb/elf)", 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;
+
+/* Debug */
+#define DWARF_DEBUGGING_INFO
+#define DWARF2_DEBUGGING_INFO
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+
+
+/* Note - it is important that these definitions match those in semi.h for the ARM port.  */
+#undef  LOCAL_LABEL_PREFIX
+#define LOCAL_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/elf\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,\"ax\",@progbits\n", (NAME));	\
+      else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))		\
+        fprintf (STREAM, "\t.section %s,\"a\"\n", (NAME));		\
+      else								\
+        fprintf (STREAM, "\t.section %s,\"aw\"\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 1
+
+#undef  READONLY_DATA_SECTION
+#define READONLY_DATA_SECTION	rdata_section
+#undef  RDATA_SECTION_ASM_OP
+#define RDATA_SECTION_ASM_OP	"\t.section .rodata"
+
+#undef  CTORS_SECTION_ASM_OP
+#define CTORS_SECTION_ASM_OP	"\t.section .ctors,\"aw\""
+#undef  DTORS_SECTION_ASM_OP
+#define DTORS_SECTION_ASM_OP	"\t.section .dtors,\"aw\""
+
+#define USER_LABEL_PREFIX ""
+
+/* Don't know how to order these.  UNALIGNED_WORD_ASM_OP is in
+   dwarf2.out. */ 
+#define UNALIGNED_WORD_ASM_OP ".4byte"
+
+#define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR)			\
+ if (((ADDR)[0] == '.') && ((ADDR)[1] == 'L')) 			\
+   fprintf ((FILE), "\t%s\t%s", UNALIGNED_WORD_ASM_OP, (ADDR));	\
+ else                                                     	\
+  fprintf ((FILE), "\t%s\t%s",					\
+           UNALIGNED_WORD_ASM_OP, (ADDR))
+
+#define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX)			\
+  do								\
+    {								\
+      fprintf ((FILE), "\t%s\t", UNALIGNED_WORD_ASM_OP);	\
+      output_addr_const ((FILE), (RTX));			\
+      fputc ('\n', (FILE));					\
+    }								\
+  while (0)
+
+/* This is how to equate one symbol to another symbol.  The syntax used is
+   `SYM1=SYM2'.  Note that this is different from the way equates are done
+   with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'.  */
+
+#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)	\
+  do						\
+    {						\
+      fprintf ((FILE), "\t");			\
+      assemble_name (FILE, LABEL1);		\
+      fprintf (FILE, " = ");			\
+      assemble_name (FILE, LABEL2);		\
+      fprintf (FILE, "\n");			\
+    }						\
+  while (0)
+
+/* 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 CTOR_LIST_BEGIN                                 \
+asm (CTORS_SECTION_ASM_OP);                             \
+func_ptr __CTOR_LIST__[1] = { (func_ptr) (-1) }
+
+#define CTOR_LIST_END                                   \
+asm (CTORS_SECTION_ASM_OP);                             \
+func_ptr __CTOR_END__[1] = { (func_ptr) 0 };
+
+#define DTOR_LIST_BEGIN                                 \
+asm (DTORS_SECTION_ASM_OP);                             \
+func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) }
+
+#define DTOR_LIST_END                                   \
+asm (DTORS_SECTION_ASM_OP);                             \
+func_ptr __DTOR_END__[1] = { (func_ptr) 0 };
+
+#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"
+
+#define INVOKE__main
+
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC "crtbegin%O%s crt0%O%s"
+
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend%O%s"
+
+/* 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)
+
+/* 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
+
+#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
+#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
+#define UNIQUE_SECTION(DECL,RELOC)				\
+  do								\
+    {								\
+      int len;							\
+      char * name, * string, * prefix;				\
+								\
+      name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));	\
+								\
+      if (! DECL_ONE_ONLY (DECL))				\
+        {							\
+          prefix = ".";						\
+          if (TREE_CODE (DECL) == FUNCTION_DECL)		\
+	    prefix = ".text.";					\
+          else if (DECL_READONLY_SECTION (DECL, RELOC))		\
+	    prefix = ".rodata.";				\
+          else							\
+	    prefix = ".data.";					\
+        }							\
+      else if (TREE_CODE (DECL) == FUNCTION_DECL)		\
+        prefix = ".gnu.linkonce.t.";				\
+      else if (DECL_READONLY_SECTION (DECL, RELOC))		\
+        prefix = ".gnu.linkonce.r.";				\
+      else							\
+        prefix = ".gnu.linkonce.d.";				\
+								\
+      len = strlen (name) + strlen (prefix);			\
+      string = alloca (len + 1);				\
+      sprintf (string, "%s%s", prefix, name);			\
+								\
+      DECL_SECTION_NAME (DECL) = build_string (len, string);	\
+    }								\
+  while (0)