gcc/config/arm/linux-elf.h

   1 /* Definitions for ARM running Linux-based GNU systems using ELF
   2    Copyright (C) 1993-2013 Free Software Foundation, Inc.
   3    Contributed by Philip Blundell <philb@gnu.org>
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /* elfos.h should have already been included.  Now just override
  22    any conflicting definitions and add any extras.  */
  23
  24 /* Run-time Target Specification.  */
  25 #undef  TARGET_DEFAULT_FLOAT_ABI
  26 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  27
  28 /* TARGET_BIG_ENDIAN_DEFAULT is set in
  29    config.gcc for big endian configurations.  */
  30 #if TARGET_BIG_ENDIAN_DEFAULT
  31 #define TARGET_ENDIAN_DEFAULT    MASK_BIG_END
  32 #define TARGET_ENDIAN_OPTION     "mbig-endian"
  33 #define TARGET_LINKER_EMULATION  "armelfb_linux"
  34 #else
  35 #define TARGET_ENDIAN_DEFAULT    0
  36 #define TARGET_ENDIAN_OPTION     "mlittle-endian"
  37 #define TARGET_LINKER_EMULATION  "armelf_linux"
  38 #endif
  39
  40 #undef  TARGET_DEFAULT
  41 #define TARGET_DEFAULT (TARGET_ENDIAN_DEFAULT)
  42
  43 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  44
  45 #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
  46
  47 #undef  MULTILIB_DEFAULTS
  48 #define MULTILIB_DEFAULTS \
  49         { "marm", "mlittle-endian", "mfloat-abi=hard", "mno-thumb-interwork" }
  50
  51 /* Now we define the strings used to build the spec file.  */
  52 #undef  LIB_SPEC
  53 #define LIB_SPEC \
  54   "%{pthread:-lpthread} \
  55    %{shared:-lc} \
  56    %{!shared:%{profile:-lc_p}%{!profile:-lc}}"
  57
  58 #define LIBGCC_SPEC "%{mfloat-abi=soft*:-lfloat} -lgcc"
  59
  60 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  61
  62 #define LINUX_TARGET_LINK_SPEC  "%{h*} \
  63    %{static:-Bstatic} \
  64    %{shared:-shared} \
  65    %{symbolic:-Bsymbolic} \
  66    %{!static: \
  67      %{rdynamic:-export-dynamic} \
  68      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  69    -X \
  70    %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
  71    SUBTARGET_EXTRA_LINK_SPEC
  72
  73 #undef  LINK_SPEC
  74 #define LINK_SPEC LINUX_TARGET_LINK_SPEC
  75
  76 #define TARGET_OS_CPP_BUILTINS()                \
  77   do                                            \
  78     {                                           \
  79         GNU_USER_TARGET_OS_CPP_BUILTINS();      \
  80     }                                           \
  81   while (0)
  82
  83 /* This is how we tell the assembler that two symbols have the same value.  */
  84 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
  85   do                                       \
  86     {                                      \
  87       assemble_name (FILE, NAME1);         \
  88       fputs (" = ", FILE);                 \
  89       assemble_name (FILE, NAME2);         \
  90       fputc ('\n', FILE);                  \
  91     }                                      \
  92   while (0)
  93
  94 #undef  FPUTYPE_DEFAULT
  95 #define FPUTYPE_DEFAULT "vfp"
  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_clobber (gen_rtx_REG (SImode, LR_REGNUM))
 109
 110 /* The GNU/Linux profiler needs a frame pointer.  */
 111 #define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile
 112
 113 /* Add .note.GNU-stack.  */
 114 #undef NEED_INDICATE_EXEC_STACK
 115 #define NEED_INDICATE_EXEC_STACK        1