gcc/config/arm/elf.h

   1 /* Definitions of target machine for GNU compiler.
   2    For ARM with ELF obj format.
   3    Copyright (C) 1995-2013 Free Software Foundation, Inc.
   4    Contributed by Philip Blundell <philb@gnu.org> and
   5    Catherine Moore <clm@cygnus.com>
   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 3, 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 GCC; see the file COPYING3.  If not see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef OBJECT_FORMAT_ELF
  24  #error elf.h included before elfos.h
  25 #endif
  26
  27 #ifndef LOCAL_LABEL_PREFIX
  28 #define LOCAL_LABEL_PREFIX "."
  29 #endif
  30
  31 #ifndef SUBTARGET_CPP_SPEC
  32 #define SUBTARGET_CPP_SPEC  "-D__ELF__"
  33 #endif
  34
  35 #ifndef SUBTARGET_EXTRA_SPECS
  36 #define SUBTARGET_EXTRA_SPECS \
  37   { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
  38   { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
  39   SUBSUBTARGET_EXTRA_SPECS
  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 #undef SUBSUBTARGET_EXTRA_SPECS
  52 #define SUBSUBTARGET_EXTRA_SPECS
  53
  54 #ifndef ASM_SPEC
  55 #define ASM_SPEC "\
  56 %{mbig-endian:-EB} \
  57 %{mlittle-endian:-EL} \
  58 %(asm_cpu_spec) \
  59 %{mapcs-*:-mapcs-%*} \
  60 %(subtarget_asm_float_spec) \
  61 %{mthumb-interwork:-mthumb-interwork} \
  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       if (!flag_inhibit_size_directive)                         \
  91         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
  92     }                                                           \
  93   while (0)
  94
  95 /* Define this macro if jump tables (for `tablejump' insns) should be
  96    output in the text section, along with the assembler instructions.
  97    Otherwise, the readonly data section is used.  */
  98 /* We put ARM and Thumb-2 jump tables in the text section, because it makes
  99    the code more efficient, but for Thumb-1 it's better to put them out of
 100    band unless we are generating compressed tables.  */
 101 #define JUMP_TABLES_IN_TEXT_SECTION                                     \
 102    (TARGET_32BIT || (TARGET_THUMB && (optimize_size || flag_pic)))
 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_DEFAULT
 110 #define TARGET_DEFAULT (MASK_APCS_FRAME)
 111 #endif
 112
 113 #ifndef MULTILIB_DEFAULTS
 114 #define MULTILIB_DEFAULTS \
 115   { "marm", "mlittle-endian", "mfloat-abi=soft", "mno-thumb-interwork", "fno-leading-underscore" }
 116 #endif
 117 \f
 118 #define TARGET_ASM_FILE_START_APP_OFF true
 119 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
 120 \f
 121
 122 /* Output an element in the static constructor array.  */
 123 #undef TARGET_ASM_CONSTRUCTOR
 124 #define TARGET_ASM_CONSTRUCTOR arm_elf_asm_constructor
 125
 126 #undef TARGET_ASM_DESTRUCTOR
 127 #define TARGET_ASM_DESTRUCTOR arm_elf_asm_destructor
 128
 129 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 130 #define NEED_PLT_RELOC  flag_pic
 131 #define NEED_GOT_RELOC  flag_pic
 132
 133 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 134 #define GOT_PCREL       0
 135
 136 /* Align output to a power of two.  Note ".align 0" is redundant,
 137    and also GAS will treat it as ".align 2" which we do not want.  */
 138 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 139   do                                                    \
 140     {                                                   \
 141       if ((POWER) > 0)                                  \
 142         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 143     }                                                   \
 144   while (0)
 145
 146 /* Horrible hack: We want to prevent some libgcc routines being included
 147    for some multilibs.  */
 148 #ifndef __ARM_ARCH_6M__
 149 #undef L_fixdfsi
 150 #undef L_fixunsdfsi
 151 #undef L_truncdfsf2
 152 #undef L_fixsfsi
 153 #undef L_fixunssfsi
 154 #undef L_floatdidf
 155 #undef L_floatdisf
 156 #undef L_floatundidf
 157 #undef L_floatundisf
 158 #endif
 159