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 GNU CC.
   9
  10 GNU CC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GNU CC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU CC; 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 #endif
  41
  42 #ifndef SUBTARGET_EXTRA_ASM_SPEC
  43 #define SUBTARGET_EXTRA_ASM_SPEC ""
  44 #endif
  45
  46 #ifndef ASM_SPEC
  47 #define ASM_SPEC "\
  48 %{mbig-endian:-EB} \
  49 %{mcpu=*:-mcpu=%*} \
  50 %{march=*:-march=%*} \
  51 %{mapcs-*:-mapcs-%*} \
  52 %{mapcs-float:-mfloat} \
  53 %{msoft-float:-mno-fpu} \
  54 %{mthumb-interwork:-mthumb-interwork} \
  55 %(subtarget_extra_asm_spec)"
  56 #endif
  57
  58 /* The ARM uses @ are a comment character so we need to redefine
  59    TYPE_OPERAND_FMT.  */
  60 #undef  TYPE_OPERAND_FMT
  61 #define TYPE_OPERAND_FMT        "%s"
  62
  63 /* We might need a ARM specific header to function declarations.  */
  64 #undef  ASM_DECLARE_FUNCTION_NAME
  65 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
  66   do                                                            \
  67     {                                                           \
  68       ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);             \
  69       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
  70       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
  71       ASM_OUTPUT_LABEL(FILE, NAME);                             \
  72     }                                                           \
  73   while (0)
  74
  75 /* We might need an ARM specific trailer for function declarations.  */
  76 #undef  ASM_DECLARE_FUNCTION_SIZE
  77 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
  78   do                                                            \
  79     {                                                           \
  80       ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL);            \
  81       if (!flag_inhibit_size_directive)                         \
  82         {                                                       \
  83           char label[256];                                      \
  84           static int labelno;                                   \
  85           labelno ++;                                           \
  86           ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);  \
  87           ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);     \
  88           ASM_OUTPUT_MEASURED_SIZE (FILE, (FNAME), label);      \
  89         }                                                       \
  90     }                                                           \
  91   while (0)
  92
  93 /* Define this macro if jump tables (for `tablejump' insns) should be
  94    output in the text section, along with the assembler instructions.
  95    Otherwise, the readonly data section is used.  */
  96 /* We put ARM jump tables in the text section, because it makes the code
  97    more efficient, but for Thumb it's better to put them out of band.  */
  98 #define JUMP_TABLES_IN_TEXT_SECTION (TARGET_ARM)
  99
 100 #ifndef LINK_SPEC
 101 #define LINK_SPEC "%{mbig-endian:-EB} -X"
 102 #endif
 103
 104 /* Run-time Target Specification.  */
 105 #ifndef TARGET_VERSION
 106 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
 107 #endif
 108
 109 #ifndef TARGET_DEFAULT
 110 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
 111 #endif
 112
 113 #ifndef MULTILIB_DEFAULTS
 114 #define MULTILIB_DEFAULTS \
 115   { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
 116 #endif
 117 \f
 118
 119 /* This outputs a lot of .req's to define alias for various registers.
 120    Let's try to avoid this.  */
 121 #ifndef ASM_FILE_START
 122 #define ASM_FILE_START(STREAM)                                  \
 123   do                                                            \
 124     {                                                           \
 125       fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n",  \
 126                ASM_COMMENT_START, version_string);              \
 127       output_file_directive (STREAM, main_input_filename);      \
 128       fprintf (STREAM, ASM_APP_OFF);                            \
 129     }                                                           \
 130   while (0)
 131 #endif
 132
 133 /* Output an internal label definition.  */
 134 #undef  ASM_OUTPUT_INTERNAL_LABEL
 135 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM)          \
 136   do                                                            \
 137     {                                                           \
 138       char * s = (char *) alloca (40 + strlen (PREFIX));        \
 139       extern int arm_target_label, arm_ccfsm_state;             \
 140       extern rtx arm_target_insn;                               \
 141                                                                 \
 142       if (arm_ccfsm_state == 3 && arm_target_label == (NUM)     \
 143           && !strcmp (PREFIX, "L"))                             \
 144         {                                                       \
 145           arm_ccfsm_state = 0;                                  \
 146           arm_target_insn = NULL;                               \
 147         }                                                       \
 148       ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM));         \
 149       ASM_OUTPUT_LABEL (STREAM, s);                             \
 150     }                                                           \
 151   while (0)
 152 \f
 153 #undef  TARGET_ASM_NAMED_SECTION
 154 #define TARGET_ASM_NAMED_SECTION  arm_elf_asm_named_section
 155 \f
 156 #undef  ASM_OUTPUT_ALIGNED_COMMON
 157 #define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGN)    \
 158   do                                                            \
 159     {                                                           \
 160       fprintf (STREAM, "\t.comm\t");                            \
 161       assemble_name (STREAM, NAME);                             \
 162       fprintf (STREAM, ", %d, %d\n", SIZE, ALIGN);              \
 163     }                                                           \
 164   while (0)
 165
 166 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 167 #define NEED_PLT_RELOC  flag_pic
 168 #define NEED_GOT_RELOC  flag_pic
 169
 170 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 171 #define GOT_PCREL       0
 172
 173 /* Biggest alignment supported by the object file format of this
 174    machine.  Use this macro to limit the alignment which can be
 175    specified using the `__attribute__ ((aligned (N)))' construct.  If
 176    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 177 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 178
 179 /* Align output to a power of two.  Note ".align 0" is redundant,
 180    and also GAS will treat it as ".align 2" which we do not want.  */
 181 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 182   do                                                    \
 183     {                                                   \
 184       if ((POWER) > 0)                                  \
 185         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 186     }                                                   \
 187   while (0)
 188
 189 #define SUPPORTS_INIT_PRIORITY 1