gnu/dist/gcc4/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 #undef  TARGET_DEFAULT_FLOAT_ABI
  32 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  33
  34 #undef  TARGET_DEFAULT
  35 #define TARGET_DEFAULT (0)
  36
  37 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  38
  39 #define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
  40
  41 #undef  MULTILIB_DEFAULTS
  42 #define MULTILIB_DEFAULTS \
  43         { "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
  44
  45 /* Now we define the strings used to build the spec file.  */
  46 #undef  LIB_SPEC
  47 #define LIB_SPEC \
  48   "%{pthread:-lpthread} \
  49    %{shared:-lc} \
  50    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
  51
  52 #define LIBGCC_SPEC "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"
  53
  54 #define LINUX_TARGET_INTERPRETER "/lib/ld-linux.so.2"
  55
  56 #define LINUX_TARGET_LINK_SPEC  "%{h*} %{version:-v} \
  57    %{b} \
  58    %{static:-Bstatic} \
  59    %{shared:-shared} \
  60    %{symbolic:-Bsymbolic} \
  61    %{rdynamic:-export-dynamic} \
  62    %{!dynamic-linker:-dynamic-linker " LINUX_TARGET_INTERPRETER "} \
  63    -X \
  64    %{mbig-endian:-EB}" \
  65    SUBTARGET_EXTRA_LINK_SPEC
  66
  67 #undef  LINK_SPEC
  68 #define LINK_SPEC LINUX_TARGET_LINK_SPEC
  69
  70 #define TARGET_OS_CPP_BUILTINS()                \
  71   do                                            \
  72     {                                           \
  73         LINUX_TARGET_OS_CPP_BUILTINS();         \
  74         if (flag_pic)                           \
  75           {                                     \
  76                 builtin_define ("__PIC__");     \
  77                 builtin_define ("__pic__");     \
  78           }                                     \
  79     }                                           \
  80   while (0)
  81
  82 /* This is how we tell the assembler that two symbols have the same value.  */
  83 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
  84   do                                       \
  85     {                                      \
  86       assemble_name (FILE, NAME1);         \
  87       fputs (" = ", FILE);                 \
  88       assemble_name (FILE, NAME2);         \
  89       fputc ('\n', FILE);                  \
  90     }                                      \
  91   while (0)
  92
  93 /* NWFPE always understands FPA instructions.  */
  94 #undef  FPUTYPE_DEFAULT
  95 #define FPUTYPE_DEFAULT FPUTYPE_FPA_EMU3
  96
  97 /* Call the function profiler with a given profile label.  */
  98 #undef  ARM_FUNCTION_PROFILER
  99 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 100 {                                                                       \
 101   fprintf (STREAM, "\tbl\tmcount%s\n",                                  \
 102            (TARGET_ARM && NEED_PLT_RELOC) ? "(PLT)" : "");              \
 103 }
 104
 105 /* The GNU/Linux profiler clobbers the link register.  Make sure the
 106    prologue knows to save it.  */
 107 #define PROFILE_HOOK(X)                                         \
 108   emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, LR_REGNUM)))
 109
 110 /* The GNU/Linux profiler needs a frame pointer.  */
 111 #define SUBTARGET_FRAME_POINTER_REQUIRED current_function_profile