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new arm/thumb uclinux targets
- To: gcc-patches at gcc dot gnu dot org
- Subject: new arm/thumb uclinux targets
- From: Philip Blundell <pb at nexus dot co dot uk>
- Date: Tue, 27 Jul 1999 10:19:00 +0100
This patch adds support for the new target configurations thumb-*-linux-gnu,
arm-*-uclinux and thumb-*-uclinux.
p.
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: Likewise.
* config/arm/t-thumb-linux: Likewise.
* config/arm/uclinux-elf.h: Likewise.
* config/arm/uclinux-telf.h: Likewise.
* configure.in (arm-*-uclinux, thumb-*-linux-gnu,
thumb-*-uclinux): New targets.
* configure: Regenerate.
Index: gnu/egcs/gcc/configure.in
diff -u gnu/egcs/gcc/configure.in:1.1.1.5 gnu/egcs/gcc/configure.in:1.2
--- gnu/egcs/gcc/configure.in:1.1.1.5 Thu Jul 22 13:46:51 1999
+++ gnu/egcs/gcc/configure.in Thu Jul 22 15:09:45 1999
@@ -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
@@ -3299,6 +3303,20 @@ changequote([,])dnl
xm_file=arm/xm-thumb.h
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
Index: gnu/egcs/gcc/config/arm/linux-telf.h
diff -u /dev/null gnu/egcs/gcc/config/arm/linux-telf.h:1.2
--- /dev/null Mon Jul 26 18:20:55 1999
+++ gnu/egcs/gcc/config/arm/linux-telf.h Thu Jul 22 15:09:48 1999
@@ -0,0 +1,200 @@
+/* Definitions for Thumb running Linux-based GNU systems using ELF
+ Copyright (C) 1993, 1994, 1997, 1998, 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);
Index: gnu/egcs/gcc/config/arm/linux-tgas.h
diff -u /dev/null gnu/egcs/gcc/config/arm/linux-tgas.h:1.3
--- /dev/null Mon Jul 26 18:20:55 1999
+++ gnu/egcs/gcc/config/arm/linux-tgas.h Thu Jul 22 15:22:41 1999
@@ -0,0 +1,85 @@
+/* Definitions of target machine for GNU compiler.
+ Thumb Linux-based GNU systems version.
+ Copyright (C) 1997, 1998, 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
Index: gnu/egcs/gcc/config/arm/t-thumb-linux
diff -u /dev/null gnu/egcs/gcc/config/arm/t-thumb-linux:1.2
--- /dev/null Mon Jul 26 18:20:55 1999
+++ gnu/egcs/gcc/config/arm/t-thumb-linux Thu Jul 22 15:09:49 1999
@@ -0,0 +1,39 @@
+# 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
+
Index: gnu/egcs/gcc/config/arm/telf.h
diff -u gnu/egcs/gcc/config/arm/telf.h:1.1.1.2 gnu/egcs/gcc/config/arm/telf.h:1.2
--- gnu/egcs/gcc/config/arm/telf.h:1.1.1.2 Wed Jun 30 16:01:47 1999
+++ gnu/egcs/gcc/config/arm/telf.h Thu Jul 22 15:09:49 1999
@@ -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 \
Index: gnu/egcs/gcc/config/arm/thumb.h
diff -u gnu/egcs/gcc/config/arm/thumb.h:1.1.1.4 gnu/egcs/gcc/config/arm/thumb.h:1.5
--- gnu/egcs/gcc/config/arm/thumb.h:1.1.1.4 Mon Jul 26 18:05:55 1999
+++ gnu/egcs/gcc/config/arm/thumb.h Mon Jul 26 18:18:56 1999
@@ -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);
@@ -1237,8 +1239,6 @@ extern int making_const_table;
#define DBX_REGISTER_NUMBER(REGNO) (REGNO)
/* Specific options for DBX Output */
-
-#define DBX_DEBUGGING_INFO 1
#define DEFAULT_GDB_EXTENSIONS 1
Index: gnu/egcs/gcc/config/arm/uclinux-elf.h
diff -u /dev/null gnu/egcs/gcc/config/arm/uclinux-elf.h:1.3
--- /dev/null Mon Jul 26 18:20:55 1999
+++ gnu/egcs/gcc/config/arm/uclinux-elf.h Fri Jul 23 15:21:02 1999
@@ -0,0 +1,32 @@
+/* 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)
Index: gnu/egcs/gcc/config/arm/uclinux-telf.h
diff -u /dev/null gnu/egcs/gcc/config/arm/uclinux-telf.h:1.3
--- /dev/null Mon Jul 26 18:20:55 1999
+++ gnu/egcs/gcc/config/arm/uclinux-telf.h Fri Jul 23 15:21:02 1999
@@ -0,0 +1,40 @@
+/* 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"