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    2005
   4    Free Software Foundation, Inc.
   5    Contributed by Philip Blundell <philb@gnu.org>
   6
   7    This file is part of GCC.
   8
   9    GCC is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published
  11    by the Free Software Foundation; either version 2, or (at your
  12    option) any later version.
  13
  14    GCC is distributed in the hope that it will be useful, but WITHOUT
  15    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  17    License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; see the file COPYING.  If not, write to
  21    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 /* elfos.h should have already been included.  Now just override
  25    any conflicting definitions and add any extras.  */
  26
  27 /* Run-time Target Specification.  */
  28 #undef  TARGET_VERSION
  29 #define TARGET_VERSION  fputs (" (ARM GNU/Linux with ELF)", stderr);
  30
  31 /* Do not assume anything about header files.  */
  32 #define NO_IMPLICIT_EXTERN_C
  33
  34 #undef  TARGET_DEFAULT_FLOAT_ABI
  35 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  36
  37 #undef  TARGET_DEFAULT
  38 #define TARGET_DEFAULT (0)
  39
  40 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  41
  42 #define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
  43
  44 #undef  MULTILIB_DEFAULTS
  45 #define MULTILIB_DEFAULTS \
  46         { "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
  47
  48 /* The GNU C++ standard library requires that these macros be defined.  */
  49 #undef CPLUSPLUS_CPP_SPEC
  50 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  51
  52 /* Now we define the strings used to build the spec file.  */
  53 #undef  LIB_SPEC
  54 #define LIB_SPEC \
  55   "%{pthread:-lpthread} \
  56    %{shared:-lc} \
  57    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
  58
  59 #define LIBGCC_SPEC "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"
  60
  61 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
  62    the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
  63    provides part of the support for getting C++ file-scope static
  64    object constructed before entering `main'.  */
  65
  66 #undef  STARTFILE_SPEC
  67 #define STARTFILE_SPEC \
  68   "%{!shared: \
  69      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  70                        %{!p:%{profile:gcrt1.o%s} \
  71                          %{!profile:crt1.o%s}}}} \
  72    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  73
  74 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
  75    the GNU/Linux magical crtend.o file (see crtstuff.c) which
  76    provides part of the support for getting C++ file-scope static
  77    object constructed before entering `main', followed by a normal
  78    GNU/Linux "finalizer" file, `crtn.o'.  */
  79
  80 #undef  ENDFILE_SPEC
  81 #define ENDFILE_SPEC \
  82   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  83
  84 #undef  LINK_SPEC
  85 #define LINK_SPEC "%{h*} %{version:-v} \
  86    %{b} %{Wl,*:%*} \
  87    %{static:-Bstatic} \
  88    %{shared:-shared} \
  89    %{symbolic:-Bsymbolic} \
  90    %{rdynamic:-export-dynamic} \
  91    %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
  92    -X \
  93    %{mbig-endian:-EB}" \
  94    SUBTARGET_EXTRA_LINK_SPEC
  95
  96 #define TARGET_OS_CPP_BUILTINS()                \
  97   do                                            \
  98     {                                           \
  99         LINUX_TARGET_OS_CPP_BUILTINS();         \
 100         if (flag_pic)                           \
 101           {                                     \
 102                 builtin_define ("__PIC__");     \
 103                 builtin_define ("__pic__");     \
 104           }                                     \
 105     }                                           \
 106   while (0)
 107
 108 /* This is how we tell the assembler that two symbols have the same value.  */
 109 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
 110   do                                       \
 111     {                                      \
 112       assemble_name (FILE, NAME1);         \
 113       fputs (" = ", FILE);                 \
 114       assemble_name (FILE, NAME2);         \
 115       fputc ('\n', FILE);                  \
 116     }                                      \
 117   while (0)
 118
 119 /* NWFPE always understands FPA instructions.  */
 120 #undef  FPUTYPE_DEFAULT
 121 #define FPUTYPE_DEFAULT FPUTYPE_FPA_EMU3
 122
 123 /* Call the function profiler with a given profile label.  */
 124 #undef  ARM_FUNCTION_PROFILER
 125 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 126 {                                                                       \
 127   fprintf (STREAM, "\tbl\tmcount%s\n",                                  \
 128            (TARGET_ARM && NEED_PLT_RELOC) ? "(PLT)" : "");              \
 129 }
 130
 131 /* The GNU/Linux profiler clobbers the link register.  Make sure the
 132    prologue knows to save it.  */
 133 #define PROFILE_HOOK(X)                                         \
 134   emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, LR_REGNUM)))
 135
 136 /* The GNU/Linux profiler needs a frame pointer.  */
 137 #define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile
 138
 139 #undef  CC1_SPEC
 140 #define CC1_SPEC "%{profile:-p}"
 141
 142 #define LINK_GCC_C_SEQUENCE_SPEC \
 143   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 144
 145 /* Use --as-needed -lgcc_s for eh support.  */
 146 #ifdef HAVE_LD_AS_NEEDED
 147 #define USE_LD_AS_NEEDED 1
 148 #endif