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_FLOAT_ABI
  34 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
  35
  36 #undef  TARGET_DEFAULT
  37 #define TARGET_DEFAULT (0)
  38
  39 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
  40
  41 #define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
  42
  43 #undef  MULTILIB_DEFAULTS
  44 #define MULTILIB_DEFAULTS \
  45         { "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
  46
  47 /* The GNU C++ standard library requires that these macros be defined.  */
  48 #undef CPLUSPLUS_CPP_SPEC
  49 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
  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 "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"
  59
  60 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
  61    the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
  62    provides part of the support for getting C++ file-scope static
  63    object constructed before entering `main'.  */
  64
  65 #undef  STARTFILE_SPEC
  66 #define STARTFILE_SPEC \
  67   "%{!shared: \
  68      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  69                        %{!p:%{profile:gcrt1.o%s} \
  70                          %{!profile:crt1.o%s}}}} \
  71    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  72
  73 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
  74    the GNU/Linux magical crtend.o file (see crtstuff.c) which
  75    provides part of the support for getting C++ file-scope static
  76    object constructed before entering `main', followed by a normal
  77    GNU/Linux "finalizer" file, `crtn.o'.  */
  78
  79 #undef  ENDFILE_SPEC
  80 #define ENDFILE_SPEC \
  81   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  82
  83 #undef  LINK_SPEC
  84 #define LINK_SPEC "%{h*} %{version:-v} \
  85    %{b} %{Wl,*:%*} \
  86    %{static:-Bstatic} \
  87    %{shared:-shared} \
  88    %{symbolic:-Bsymbolic} \
  89    %{rdynamic:-export-dynamic} \
  90    %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
  91    -X \
  92    %{mbig-endian:-EB}" \
  93    SUBTARGET_EXTRA_LINK_SPEC
  94
  95 #define TARGET_OS_CPP_BUILTINS()                \
  96   do                                            \
  97     {                                           \
  98         LINUX_TARGET_OS_CPP_BUILTINS();         \
  99         if (flag_pic)                           \
 100           {                                     \
 101                 builtin_define ("__PIC__");     \
 102                 builtin_define ("__pic__");     \
 103           }                                     \
 104     }                                           \
 105   while (0)
 106
 107 /* This is how we tell the assembler that two symbols have the same value.  */
 108 #define ASM_OUTPUT_DEF(FILE, NAME1, NAME2) \
 109   do                                       \
 110     {                                      \
 111       assemble_name (FILE, NAME1);         \
 112       fputs (" = ", FILE);                 \
 113       assemble_name (FILE, NAME2);         \
 114       fputc ('\n', FILE);                  \
 115     }                                      \
 116   while (0)
 117
 118 /* NWFPE always understands FPA instructions.  */
 119 #undef  FPUTYPE_DEFAULT
 120 #define FPUTYPE_DEFAULT FPUTYPE_FPA_EMU3
 121
 122 /* Call the function profiler with a given profile label.  */
 123 #undef  ARM_FUNCTION_PROFILER
 124 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO)                          \
 125 {                                                                       \
 126   fprintf (STREAM, "\tbl\tmcount%s\n", NEED_PLT_RELOC ? "(PLT)" : "");  \
 127 }
 128
 129 /* The linux profiler clobbers the link register.  Make sure the
 130    prologue knows to save it.  */
 131 #define PROFILE_HOOK(X)                                         \
 132   emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, LR_REGNUM)))
 133
 134 #undef  CC1_SPEC
 135 #define CC1_SPEC "%{profile:-p}"
 136
 137 #define LINK_GCC_C_SEQUENCE_SPEC \
 138   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 139
 140 /* Use --as-needed -lgcc_s for eh support.  */
 141 #ifdef HAVE_LD_AS_NEEDED
 142 #define USE_LD_AS_NEEDED 1
 143 #endif