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=*:-m%*} \
  50 %{march=*:-m%*} \
  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       fprintf (FILE, "%s", TYPE_ASM_OP);                \
  70       assemble_name (FILE, NAME);                       \
  71       putc (',', FILE);                                 \
  72       fprintf (FILE, TYPE_OPERAND_FMT, "function");     \
  73       putc ('\n', FILE);                                \
  74       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));    \
  75       ASM_OUTPUT_LABEL(FILE, NAME);                     \
  76     }                                                   \
  77   while (0)
  78
  79 /* We might need an ARM specific trailer for function declarations.  */
  80 #undef  ASM_DECLARE_FUNCTION_SIZE
  81 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
  82   do                                                            \
  83     {                                                           \
  84       ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL);            \
  85       if (!flag_inhibit_size_directive)                         \
  86         {                                                       \
  87           char label[256];                                      \
  88           static int labelno;                                   \
  89           labelno ++;                                           \
  90           ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);  \
  91           ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);     \
  92           fprintf (FILE, "%s", SIZE_ASM_OP);                    \
  93           assemble_name (FILE, (FNAME));                        \
  94           fprintf (FILE, ",");                                  \
  95           assemble_name (FILE, label);                          \
  96           fprintf (FILE, "-");                                  \
  97           assemble_name (FILE, (FNAME));                        \
  98           putc ('\n', FILE);                                    \
  99         }                                                       \
 100     }                                                           \
 101   while (0)
 102
 103 /* Define this macro if jump tables (for `tablejump' insns) should be
 104    output in the text section, along with the assembler instructions.
 105    Otherwise, the readonly data section is used.  */
 106 #define JUMP_TABLES_IN_TEXT_SECTION 1
 107
 108 #ifndef LINK_SPEC
 109 #define LINK_SPEC "%{mbig-endian:-EB} -X"
 110 #endif
 111
 112 /* Run-time Target Specification.  */
 113 #ifndef TARGET_VERSION
 114 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
 115 #endif
 116
 117 #ifndef TARGET_DEFAULT
 118 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
 119 #endif
 120
 121 #ifndef MULTILIB_DEFAULTS
 122 #define MULTILIB_DEFAULTS \
 123   { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
 124 #endif
 125 \f
 126
 127 /* This outputs a lot of .req's to define alias for various registers.
 128    Let's try to avoid this.  */
 129 #ifndef ASM_FILE_START
 130 #define ASM_FILE_START(STREAM)                                  \
 131   do                                                            \
 132     {                                                           \
 133       fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n",  \
 134                ASM_COMMENT_START, version_string);              \
 135       output_file_directive (STREAM, main_input_filename);      \
 136       fprintf (STREAM, ASM_APP_OFF);                            \
 137     }                                                           \
 138   while (0)
 139 #endif
 140
 141 /* Output an internal label definition.  */
 142 #undef  ASM_OUTPUT_INTERNAL_LABEL
 143 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM)          \
 144   do                                                            \
 145     {                                                           \
 146       char * s = (char *) alloca (40 + strlen (PREFIX));        \
 147       extern int arm_target_label, arm_ccfsm_state;             \
 148       extern rtx arm_target_insn;                               \
 149                                                                 \
 150       if (arm_ccfsm_state == 3 && arm_target_label == (NUM)     \
 151           && !strcmp (PREFIX, "L"))                             \
 152         {                                                       \
 153           arm_ccfsm_state = 0;                                  \
 154           arm_target_insn = NULL;                               \
 155         }                                                       \
 156       ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM));         \
 157       ASM_OUTPUT_LABEL (STREAM, s);                             \
 158     }                                                           \
 159   while (0)
 160 \f
 161 #undef  TARGET_ASM_NAMED_SECTION
 162 #define TARGET_ASM_NAMED_SECTION  arm_elf_asm_named_section
 163 \f
 164 #undef  ASM_OUTPUT_ALIGNED_COMMON
 165 #define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGN)    \
 166   do                                                            \
 167     {                                                           \
 168       fprintf (STREAM, "\t.comm\t");                            \
 169       assemble_name (STREAM, NAME);                             \
 170       fprintf (STREAM, ", %d, %d\n", SIZE, ALIGN);              \
 171     }                                                           \
 172   while (0)
 173
 174 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
 175 #define NEED_PLT_RELOC  flag_pic
 176 #define NEED_GOT_RELOC  flag_pic
 177
 178 /* The ELF assembler handles GOT addressing differently to NetBSD.  */
 179 #define GOT_PCREL       0
 180
 181 /* Biggest alignment supported by the object file format of this
 182    machine.  Use this macro to limit the alignment which can be
 183    specified using the `__attribute__ ((aligned (N)))' construct.  If
 184    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 185 #define MAX_OFILE_ALIGNMENT (32768 * 8)
 186
 187 /* Align output to a power of two.  Note ".align 0" is redundant,
 188    and also GAS will treat it as ".align 2" which we do not want.  */
 189 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 190   do                                                    \
 191     {                                                   \
 192       if ((POWER) > 0)                                  \
 193         fprintf (STREAM, "\t.align\t%d\n", POWER);      \
 194     }                                                   \
 195   while (0)