gcc/config/arm/coff.h

   1 /* Definitions of target machine for GNU compiler,
   2    for ARM with COFF obj format.
   3    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   4    Contributed by Doug Evans (dje@cygnus.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #include "arm/semi.h"
  24 \f
  25 /* Run-time Target Specification.  */
  26 #undef TARGET_VERSION
  27 #define TARGET_VERSION fputs (" (ARM/coff)", stderr)
  28
  29 /* ??? Maybe use --with{enable?}-fpu or some such to make hardware floating
  30    point the default.  NOT --nfp!  --with{enable?} is supposed to replace it
  31    (right?), so let's stop using it.  */
  32 #undef TARGET_DEFAULT
  33 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT /*+ TARGET_CPU_DEFAULT*/)
  34
  35 /* ??? Is a big-endian default intended to be supported?  */
  36 #if 0 /*TARGET_CPU_DEFAULT & ARM_FLAG_BIG_END*/
  37 #define MULTILIB_DEFAULTS { "mbig-endian" }
  38 #else
  39 #define MULTILIB_DEFAULTS { "mlittle-endian" }
  40 #endif
  41 \f
  42 /* ??? Does arm.h really need to set this to 32?  */
  43 #undef STRUCTURE_SIZE_BOUNDARY
  44 #define STRUCTURE_SIZE_BOUNDARY 8
  45 \f
  46 /* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
  47    is a valid machine specific attribute for DECL.
  48    The attributes in ATTRIBUTES have previously been assigned to DECL.  */
  49 extern int arm_valid_machine_decl_attribute ();
  50 #define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
  51 arm_valid_machine_decl_attribute (DECL, ATTRIBUTES, IDENTIFIER, ARGS)
  52 \f
  53 /* This is COFF, but prefer stabs.  */
  54 #define SDB_DEBUGGING_INFO
  55
  56 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  57
  58 #include "dbxcoff.h"
  59 \f
  60 #undef LOCAL_LABEL_PREFIX
  61 #define LOCAL_LABEL_PREFIX "."
  62
  63 #undef USER_LABEL_PREFIX
  64 #define USER_LABEL_PREFIX ""
  65
  66 /* A C statement to output assembler commands which will identify the
  67    object file as having been compiled with GNU CC (or another GNU
  68    compiler).  */
  69 /* Define this to NULL so we don't get anything.
  70    We have ASM_IDENTIFY_LANGUAGE.
  71    Also, when using stabs, gcc2_compiled must be a stabs entry, not an
  72    ordinary symbol, or gdb won't see it.  The stabs entry must be
  73    before the N_SO in order for gdb to find it.  */
  74 #define ASM_IDENTIFY_GCC(STREAM)
  75
  76 /* This outputs a lot of .req's to define alias for various registers.
  77    Let's try to avoid this.  */
  78 #undef ASM_FILE_START
  79 #define ASM_FILE_START(STREAM) \
  80 do {                                                            \
  81   extern char *version_string;                                  \
  82   fprintf (STREAM, "%s Generated by gcc %s for ARM/coff\n",     \
  83            ASM_COMMENT_START, version_string);                  \
  84 } while (0)
  85
  86 /* A C statement to output something to the assembler file to switch to section
  87    NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
  88    NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
  89    define this macro in such cases.  */
  90 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
  91 do {                                                            \
  92   if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)              \
  93     fprintf (STREAM, "\t.section %s,\"x\"\n", (NAME));          \
  94   else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))       \
  95     fprintf (STREAM, "\t.section %s,\"\"\n", (NAME));           \
  96   else                                                          \
  97     fprintf (STREAM, "\t.section %s,\"w\"\n", (NAME));          \
  98 } while (0)
  99 \f
 100 /* Support the ctors/dtors and other sections.  */
 101
 102 #undef INIT_SECTION_ASM_OP
 103
 104 /* Define this macro if jump tables (for `tablejump' insns) should be
 105    output in the text section, along with the assembler instructions.
 106    Otherwise, the readonly data section is used.  */
 107 #define JUMP_TABLES_IN_TEXT_SECTION
 108
 109 #undef READONLY_DATA_SECTION
 110 #define READONLY_DATA_SECTION   rdata_section
 111 #undef RDATA_SECTION_ASM_OP
 112 #define RDATA_SECTION_ASM_OP    "\t.section .rdata"
 113
 114 #undef CTORS_SECTION_ASM_OP
 115 #define CTORS_SECTION_ASM_OP    "\t.section .ctors,\"x\""
 116 #undef DTORS_SECTION_ASM_OP
 117 #define DTORS_SECTION_ASM_OP    "\t.section .dtors,\"x\""
 118
 119 /* A list of other sections which the compiler might be "in" at any
 120    given time.  */
 121
 122 #undef EXTRA_SECTIONS
 123 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
 124
 125 #define SUBTARGET_EXTRA_SECTIONS
 126
 127 /* A list of extra section function definitions.  */
 128
 129 #undef EXTRA_SECTION_FUNCTIONS
 130 #define EXTRA_SECTION_FUNCTIONS \
 131   RDATA_SECTION_FUNCTION        \
 132   CTORS_SECTION_FUNCTION        \
 133   DTORS_SECTION_FUNCTION        \
 134   SUBTARGET_EXTRA_SECTION_FUNCTIONS
 135
 136 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
 137
 138 #define RDATA_SECTION_FUNCTION \
 139 void                                                                    \
 140 rdata_section ()                                                        \
 141 {                                                                       \
 142   if (in_section != in_rdata)                                           \
 143     {                                                                   \
 144       fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);             \
 145       in_section = in_rdata;                                            \
 146     }                                                                   \
 147 }
 148
 149 #define CTORS_SECTION_FUNCTION \
 150 void                                                                    \
 151 ctors_section ()                                                        \
 152 {                                                                       \
 153   if (in_section != in_ctors)                                           \
 154     {                                                                   \
 155       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);             \
 156       in_section = in_ctors;                                            \
 157     }                                                                   \
 158 }
 159
 160 #define DTORS_SECTION_FUNCTION \
 161 void                                                                    \
 162 dtors_section ()                                                        \
 163 {                                                                       \
 164   if (in_section != in_dtors)                                           \
 165     {                                                                   \
 166       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);             \
 167       in_section = in_dtors;                                            \
 168     }                                                                   \
 169 }
 170 \f
 171 /* Support the ctors/dtors sections for g++.  */
 172
 173 #define INT_ASM_OP ".word"
 174
 175 /* A C statement (sans semicolon) to output an element in the table of
 176    global constructors.  */
 177 #undef ASM_OUTPUT_CONSTRUCTOR
 178 #define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
 179 do {                                            \
 180   ctors_section ();                             \
 181   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 182   assemble_name (STREAM, NAME);                 \
 183   fprintf (STREAM, "\n");                       \
 184 } while (0)
 185
 186 /* A C statement (sans semicolon) to output an element in the table of
 187    global destructors.  */
 188 #undef ASM_OUTPUT_DESTRUCTOR
 189 #define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
 190 do {                                            \
 191   dtors_section ();                             \
 192   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 193   assemble_name (STREAM, NAME);                 \
 194   fprintf (STREAM, "\n");                       \
 195 } while (0)
 196
 197 /* __CTOR_LIST__ and __DTOR_LIST__ must be defined by the linker script.  */
 198 #define CTOR_LISTS_DEFINED_EXTERNALLY
 199
 200 #undef DO_GLOBAL_CTORS_BODY
 201 #undef DO_GLOBAL_DTORS_BODY
 202
 203 /* The ARM development system has atexit and doesn't have _exit,
 204    so define this for now.  */
 205 #define HAVE_ATEXIT
 206
 207 /* The ARM development system defines __main.  */
 208 #define NAME__MAIN "__gccmain"
 209 #define SYMBOL__MAIN __gccmain