gcc/config/arm/linux-elf.h

   1 /* Definitions for ARM running Linux-based GNU systems using ELF
   2    Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   3    Free Software Foundation, Inc.
   4    Contributed by Philip Blundell <philb@gnu.org>
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 2, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; see the file COPYING.  If not, write to
  20    the Free Software Foundation, 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 /* elfos.h should have already been included.  Now just override
  24    any conflicting definitions and add any extras.  */
  25
  26 /* Run-time Target Specification.  */
  27 #undef  TARGET_VERSION
  28 #define TARGET_VERSION  fputs (" (ARM GNU/Linux with ELF)", stderr);
  29
  30 /* Do not assume anything about header files.  */
  31 #define NO_IMPLICIT_EXTERN_C
  32
  33 #undef  TARGET_DEFAULT
  34 #define TARGET_DEFAULT (0)
  35
  36 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  37
  38 #define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
  39
  40 #undef  MULTILIB_DEFAULTS
  41 #define MULTILIB_DEFAULTS \
  42         { "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
  43
  44 /* The GNU C++ standard library requires that these macros be defined.  */
  45 #undef CPLUSPLUS_CPP_SPEC
  46 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  47
  48 /* Now we define the strings used to build the spec file.  */
  49 #undef  LIB_SPEC
  50 #define LIB_SPEC \
  51   "%{pthread:-lpthread} \
  52    %{shared:-lc} \
  53    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
  54
  55 #define LIBGCC_SPEC "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"
  56
  57 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
  58    the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
  59    provides part of the support for getting C++ file-scope static
  60    object constructed before entering `main'.  */
  61
  62 #undef  STARTFILE_SPEC
  63 #define STARTFILE_SPEC \
  64   "%{!shared: \
  65      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  66                        %{!p:%{profile:gcrt1.o%s} \
  67                          %{!profile:crt1.o%s}}}} \
  68    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  69
  70 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
  71    the GNU/Linux magical crtend.o file (see crtstuff.c) which
  72    provides part of the support for getting C++ file-scope static
  73    object constructed before entering `main', followed by a normal
  74    GNU/Linux "finalizer" file, `crtn.o'.  */
  75
  76 #undef  ENDFILE_SPEC
  77 #define ENDFILE_SPEC \
  78   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  79
  80 #undef  LINK_SPEC
  81 #define LINK_SPEC "%{h*} %{version:-v} \
  82    %{b} %{Wl,*:%*} \
  83    %{static:-Bstatic} \
  84    %{shared:-shared} \
  85    %{symbolic:-Bsymbolic} \
  86    %{rdynamic:-export-dynamic} \
  87    %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
  88    -X \
  89    %{mbig-endian:-EB}" \
  90    SUBTARGET_EXTRA_LINK_SPEC
  91
  92 #define TARGET_OS_CPP_BUILTINS() LINUX_TARGET_OS_CPP_BUILTINS()
  93
  94 /* This is how we tell the assembler that two symbols have the same value.  */
  95 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
  96   do                                       \
  97     {                                      \
  98       assemble_name (FILE, NAME1);         \
  99       fputs (" = ", FILE);                 \
 100       assemble_name (FILE, NAME2);         \
 101       fputc ('\n', FILE);                  \
 102     }                                      \
 103   while (0)
 104
 105 /* NWFPE always understands FPA instructions.  */
 106 #undef  FPUTYPE_DEFAULT
 107 #define FPUTYPE_DEFAULT FPUTYPE_FPA_EMU3
 108
 109 /* Call the function profiler with a given profile label.  */
 110 #undef  ARM_FUNCTION_PROFILER
 111 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 112 {                                                                       \
 113   fprintf (STREAM, "\tbl\tmcount%s\n", NEED_PLT_RELOC ? "(PLT)" : "");  \
 114 }
 115
 116 /* The linux profiler clobbers the link register.  Make sure the
 117    prologue knows to save it.  */
 118 #define PROFILE_HOOK(X)                                         \
 119   emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, LR_REGNUM)))
 120
 121 #undef  CC1_SPEC
 122 #define CC1_SPEC "%{profile:-p}"
 123
 124 #define LINK_GCC_C_SEQUENCE_SPEC \
 125   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 126
 127 /* Use --as-needed -lgcc_s for eh support.  */
 128 #ifdef HAVE_LD_AS_NEEDED
 129 #define USE_LD_AS_NEEDED 1
 130 #endif