gcc/config/arm/elf.h

   1 /* Definitions of target machine for GNU compiler.
   2    For ARM with ELF obj format.
   3    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2004, 2005, 2007
   4    Free Software Foundation, Inc.
   5    Contributed by Philip Blundell <philb@gnu.org> and
   6    Catherine Moore <clm@cygnus.com>
   7
   8    This file is part of GCC.
   9
  10    GCC is free software; you can redistribute it and/or modify it
  11    under the terms of the GNU General Public License as published
  12    by the Free Software Foundation; either version 2, or (at your
  13    option) any later version.
  14
  15    GCC is distributed in the hope that it will be useful, but WITHOUT
  16    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  18    License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GCC; see the file COPYING.  If not, write to
  22    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 #ifndef OBJECT_FORMAT_ELF
  26  #error elf.h included before elfos.h
  27 #endif
  28
  29 #ifndef LOCAL_LABEL_PREFIX
  30 #define LOCAL_LABEL_PREFIX "."
  31 #endif
  32
  33 #ifndef SUBTARGET_CPP_SPEC
  34 #define SUBTARGET_CPP_SPEC  "-D__ELF__"
  35 #endif
  36
  37 #ifndef SUBTARGET_EXTRA_SPECS
  38 #define SUBTARGET_EXTRA_SPECS \
  39   { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
  40   { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC },
  41 #endif
  42
  43 #ifndef SUBTARGET_EXTRA_ASM_SPEC
  44 #define SUBTARGET_EXTRA_ASM_SPEC ""
  45 #endif
  46
  47 #ifndef SUBTARGET_ASM_FLOAT_SPEC
  48 #define SUBTARGET_ASM_FLOAT_SPEC "\
  49 %{mapcs-float:-mfloat}"
  50 #endif
  51
  52 #ifndef ASM_SPEC
  53 #define ASM_SPEC "\
  54 %{mbig-endian:-EB} \
  55 %{mlittle-endian:-EL} \
  56 %{mcpu=*:-mcpu=%*} \
  57 %{march=*:-march=%*} \
  58 %{mapcs-*:-mapcs-%*} \
  59 %(subtarget_asm_float_spec) \
  60 %{mthumb-interwork:-mthumb-interwork} \
  61 %{msoft-float:-mfloat-abi=soft} %{mhard-float:-mfloat-abi=hard} \
  62 %{mfloat-abi=*} %{mfpu=*} \
  63 %(subtarget_extra_asm_spec)"
  64 #endif
  65
  66 /* The ARM uses @ are a comment character so we need to redefine
  67    TYPE_OPERAND_FMT.  */
  68 #undef  TYPE_OPERAND_FMT
  69 #define TYPE_OPERAND_FMT        "%%%s"
  70
  71 /* We might need a ARM specific header to function declarations.  */
  72 #undef  ASM_DECLARE_FUNCTION_NAME
  73 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
  74   do                                                            \
  75     {                                                           \
  76       ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);             \
  77       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
  78       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
  79       ASM_OUTPUT_LABEL(FILE, NAME);                             \
  80       ARM_OUTPUT_FN_UNWIND (FILE, TRUE);                        \
  81     }                                                           \
  82   while (0)
  83
  84 /* We might need an ARM specific trailer for function declarations.  */
  85 #undef  ASM_DECLARE_FUNCTION_SIZE
  86 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
  87   do                                                            \
  88     {                                                           \
  89       ARM_OUTPUT_FN_UNWIND (FILE, FALSE);                       \
  90       ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL);            \
  91       if (!flag_inhibit_size_directive)                         \
  92         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
  93     }                                                           \
  94   while (0)
  95
  96 /* Define this macro if jump tables (for `tablejump' insns) should be
  97    output in the text section, along with the assembler instructions.
  98    Otherwise, the readonly data section is used.  */
  99 /* We put ARM and Thumb-2 jump tables in the text section, because it makes
 100    the code more efficient, but for Thumb-1 it's better to put them out of
 101    band.  */
 102 #define JUMP_TABLES_IN_TEXT_SECTION (TARGET_32BIT)
 103
 104 #ifndef LINK_SPEC
 105 #define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X"
 106 #endif
 107
 108 /* Run-time Target Specification.  */
 109 #ifndef TARGET_VERSION
 110 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
 111 #endif
 112
 113 #ifndef TARGET_DEFAULT
 114 #define TARGET_DEFAULT (MASK_APCS_FRAME)
 115 #endif
 116
 117 #ifndef MULTILIB_DEFAULTS
 118 #define MULTILIB_DEFAULTS \
 119   { "marm", "mlittle-endian", "msoft-float", "mno-thumb-interwork", "fno-leading-underscore" }
 120 #endif
 121 \f
 122 #define TARGET_ASM_FILE_START_APP_OFF true
 123 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
 124 \f
 125
 126 /* Output an element in the static constructor array.  */
 127 #undef TARGET_ASM_CONSTRUCTOR
 128 #define TARGET_ASM_CONSTRUCTOR arm_elf_asm_constructor
 129
 130 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 131 #define NEED_PLT_RELOC  flag_pic
 132 #define NEED_GOT_RELOC  flag_pic
 133
 134 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 135 #define GOT_PCREL       0
 136
 137 /* Align output to a power of two.  Note ".align 0" is redundant,
 138    and also GAS will treat it as ".align 2" which we do not want.  */
 139 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 140   do                                                    \
 141     {                                                   \
 142       if ((POWER) > 0)                                  \
 143         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 144     }                                                   \
 145   while (0)
 146