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
   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, 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, 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} %{msoft-float:-mno-fpu}"
  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 %(subtarget_extra_asm_spec)"
  62 #endif
  63
  64 /* The ARM uses @ are a comment character so we need to redefine
  65    TYPE_OPERAND_FMT.  */
  66 #undef  TYPE_OPERAND_FMT
  67 #define TYPE_OPERAND_FMT        "%%%s"
  68
  69 /* We might need a ARM specific header to function declarations.  */
  70 #undef  ASM_DECLARE_FUNCTION_NAME
  71 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
  72   do                                                            \
  73     {                                                           \
  74       ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);             \
  75       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
  76       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
  77       ASM_OUTPUT_LABEL(FILE, NAME);                             \
  78     }                                                           \
  79   while (0)
  80
  81 /* We might need an ARM specific trailer for function declarations.  */
  82 #undef  ASM_DECLARE_FUNCTION_SIZE
  83 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
  84   do                                                            \
  85     {                                                           \
  86       ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL);            \
  87       if (!flag_inhibit_size_directive)                         \
  88         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
  89     }                                                           \
  90   while (0)
  91
  92 /* Define this macro if jump tables (for `tablejump' insns) should be
  93    output in the text section, along with the assembler instructions.
  94    Otherwise, the readonly data section is used.  */
  95 /* We put ARM jump tables in the text section, because it makes the code
  96    more efficient, but for Thumb it's better to put them out of band.  */
  97 #define JUMP_TABLES_IN_TEXT_SECTION (TARGET_ARM)
  98
  99 #ifndef LINK_SPEC
 100 #define LINK_SPEC "%{mbig-endian:-EB} %{mlittle-endian:-EL} -X"
 101 #endif
 102
 103 /* Run-time Target Specification.  */
 104 #ifndef TARGET_VERSION
 105 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
 106 #endif
 107
 108 #ifndef TARGET_DEFAULT
 109 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
 110 #endif
 111
 112 #ifndef MULTILIB_DEFAULTS
 113 #define MULTILIB_DEFAULTS \
 114   { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
 115 #endif
 116 \f
 117
 118 /* This outputs a lot of .req's to define alias for various registers.
 119    Let's try to avoid this.  */
 120 #ifndef ASM_FILE_START
 121 #define ASM_FILE_START(STREAM)                                  \
 122   do                                                            \
 123     {                                                           \
 124       fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n",  \
 125                ASM_COMMENT_START, version_string);              \
 126       output_file_directive (STREAM, main_input_filename);      \
 127       fprintf (STREAM, ASM_APP_OFF);                            \
 128     }                                                           \
 129   while (0)
 130 #endif
 131 \f
 132 #undef  TARGET_ASM_NAMED_SECTION
 133 #define TARGET_ASM_NAMED_SECTION  arm_elf_asm_named_section
 134 \f
 135 #undef  ASM_OUTPUT_ALIGNED_COMMON
 136 #define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGN)    \
 137   do                                                            \
 138     {                                                           \
 139       fprintf (STREAM, "\t.comm\t");                            \
 140       assemble_name (STREAM, NAME);                             \
 141       fprintf (STREAM, ", %d, %d\n", SIZE, ALIGN);              \
 142     }                                                           \
 143   while (0)
 144
 145 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 146 #define NEED_PLT_RELOC  flag_pic
 147 #define NEED_GOT_RELOC  flag_pic
 148
 149 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 150 #define GOT_PCREL       0
 151
 152 /* Biggest alignment supported by the object file format of this
 153    machine.  Use this macro to limit the alignment which can be
 154    specified using the `__attribute__ ((aligned (N)))' construct.  If
 155    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 156 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 157
 158 /* Align output to a power of two.  Note ".align 0" is redundant,
 159    and also GAS will treat it as ".align 2" which we do not want.  */
 160 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 161   do                                                    \
 162     {                                                   \
 163       if ((POWER) > 0)                                  \
 164         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 165     }                                                   \
 166   while (0)
 167
 168 #define SUPPORTS_INIT_PRIORITY 1