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 3, 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 COPYING3.  If not see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 #ifndef OBJECT_FORMAT_ELF
  25  #error elf.h included before elfos.h
  26 #endif
  27
  28 #ifndef LOCAL_LABEL_PREFIX
  29 #define LOCAL_LABEL_PREFIX "."
  30 #endif
  31
  32 #ifndef SUBTARGET_CPP_SPEC
  33 #define SUBTARGET_CPP_SPEC  "-D__ELF__"
  34 #endif
  35
  36 #ifndef SUBTARGET_EXTRA_SPECS
  37 #define SUBTARGET_EXTRA_SPECS \
  38   { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
  39   { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC },
  40 #endif
  41
  42 #ifndef SUBTARGET_EXTRA_ASM_SPEC
  43 #define SUBTARGET_EXTRA_ASM_SPEC ""
  44 #endif
  45
  46 #ifndef SUBTARGET_ASM_FLOAT_SPEC
  47 #define SUBTARGET_ASM_FLOAT_SPEC "\
  48 %{mapcs-float:-mfloat}"
  49 #endif
  50
  51 #ifndef ASM_SPEC
  52 #define ASM_SPEC "\
  53 %{mbig-endian:-EB} \
  54 %{mlittle-endian:-EL} \
  55 %{mcpu=*:-mcpu=%*} \
  56 %{march=*:-march=%*} \
  57 %{mapcs-*:-mapcs-%*} \
  58 %(subtarget_asm_float_spec) \
  59 %{mthumb-interwork:-mthumb-interwork} \
  60 %{msoft-float:-mfloat-abi=soft} %{mhard-float:-mfloat-abi=hard} \
  61 %{mfloat-abi=*} %{mfpu=*} \
  62 %(subtarget_extra_asm_spec)"
  63 #endif
  64
  65 /* The ARM uses @ are a comment character so we need to redefine
  66    TYPE_OPERAND_FMT.  */
  67 #undef  TYPE_OPERAND_FMT
  68 #define TYPE_OPERAND_FMT        "%%%s"
  69
  70 /* We might need a ARM specific header to function declarations.  */
  71 #undef  ASM_DECLARE_FUNCTION_NAME
  72 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
  73   do                                                            \
  74     {                                                           \
  75       ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);             \
  76       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
  77       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
  78       ASM_OUTPUT_LABEL(FILE, NAME);                             \
  79       ARM_OUTPUT_FN_UNWIND (FILE, TRUE);                        \
  80     }                                                           \
  81   while (0)
  82
  83 /* We might need an ARM specific trailer for function declarations.  */
  84 #undef  ASM_DECLARE_FUNCTION_SIZE
  85 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
  86   do                                                            \
  87     {                                                           \
  88       ARM_OUTPUT_FN_UNWIND (FILE, FALSE);                       \
  89       if (!flag_inhibit_size_directive)                         \
  90         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
  91     }                                                           \
  92   while (0)
  93
  94 /* Define this macro if jump tables (for `tablejump' insns) should be
  95    output in the text section, along with the assembler instructions.
  96    Otherwise, the readonly data section is used.  */
  97 /* We put ARM and Thumb-2 jump tables in the text section, because it makes
  98    the code more efficient, but for Thumb-1 it's better to put them out of
  99    band.  */
 100 #define JUMP_TABLES_IN_TEXT_SECTION (TARGET_32BIT)
 101
 102 #ifndef LINK_SPEC
 103 #define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X"
 104 #endif
 105
 106 /* Run-time Target Specification.  */
 107 #ifndef TARGET_VERSION
 108 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
 109 #endif
 110
 111 #ifndef TARGET_DEFAULT
 112 #define TARGET_DEFAULT (MASK_APCS_FRAME)
 113 #endif
 114
 115 #ifndef MULTILIB_DEFAULTS
 116 #define MULTILIB_DEFAULTS \
 117   { "marm", "mlittle-endian", "msoft-float", "mno-thumb-interwork", "fno-leading-underscore" }
 118 #endif
 119 \f
 120 #define TARGET_ASM_FILE_START_APP_OFF true
 121 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
 122 \f
 123
 124 /* Output an element in the static constructor array.  */
 125 #undef TARGET_ASM_CONSTRUCTOR
 126 #define TARGET_ASM_CONSTRUCTOR arm_elf_asm_constructor
 127
 128 #undef TARGET_ASM_DESTRUCTOR
 129 #define TARGET_ASM_DESTRUCTOR arm_elf_asm_destructor
 130
 131 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 132 #define NEED_PLT_RELOC  flag_pic
 133 #define NEED_GOT_RELOC  flag_pic
 134
 135 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 136 #define GOT_PCREL       0
 137
 138 /* Align output to a power of two.  Note ".align 0" is redundant,
 139    and also GAS will treat it as ".align 2" which we do not want.  */
 140 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 141   do                                                    \
 142     {                                                   \
 143       if ((POWER) > 0)                                  \
 144         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 145     }                                                   \
 146   while (0)
 147