gcc/config/arm/tcoff.h

   1 /* Definitions of target machine for GNU compiler,
   2    for Thumb with COFF obj format.
   3    Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   4    Derived from arm/coff.h originally 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/thumb.h"
  24 \f
  25 /* Run-time Target Specification.  */
  26 #undef TARGET_VERSION
  27 #define TARGET_VERSION fputs (" (Thumb/coff)", stderr)
  28
  29 #define MULTILIB_DEFAULTS { "mlittle-endian" }
  30 \f
  31 /* Setting this to 32 produces more efficient code, but the value set in previous
  32    versions of this toolchain was 8, which produces more compact structures. The
  33    command line option -mstructure_size_boundary=<n> can be used to change this
  34    value.  */
  35 #undef STRUCTURE_SIZE_BOUNDARY
  36 #define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary
  37
  38 extern int arm_structure_size_boundary;
  39 \f
  40 /* This is COFF, but prefer stabs.  */
  41 #define SDB_DEBUGGING_INFO
  42
  43 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  44
  45 #include "dbxcoff.h"
  46 \f
  47 /* Note - it is important that these definitions match those in semi.h for the ARM port.  */
  48 #undef LOCAL_LABEL_PREFIX
  49 #define LOCAL_LABEL_PREFIX "."
  50
  51 #undef USER_LABEL_PREFIX
  52 #define USER_LABEL_PREFIX ""
  53
  54 /* A C statement to output assembler commands which will identify the
  55    object file as having been compiled with GNU CC (or another GNU
  56    compiler).  */
  57 #define ASM_IDENTIFY_GCC(STREAM)                                \
  58      fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
  59
  60 #undef ASM_FILE_START
  61 #define ASM_FILE_START(STREAM) \
  62 do {                                                            \
  63   extern char *version_string;                                  \
  64   fprintf ((STREAM), "%s Generated by gcc %s for Thumb/coff\n", \
  65            ASM_COMMENT_START, version_string);                  \
  66   fprintf ((STREAM), ASM_APP_OFF);                              \
  67 } while (0)
  68
  69 /* A C statement to output something to the assembler file to switch to section
  70    NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
  71    NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
  72    define this macro in such cases.  */
  73 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
  74 do {                                                            \
  75   if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)              \
  76     fprintf (STREAM, "\t.section %s,\"x\"\n", (NAME));          \
  77   else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))       \
  78     fprintf (STREAM, "\t.section %s,\"\"\n", (NAME));           \
  79   else                                                          \
  80     fprintf (STREAM, "\t.section %s,\"w\"\n", (NAME));          \
  81 } while (0)
  82 \f
  83 /* Support the ctors/dtors and other sections.  */
  84
  85 #undef INIT_SECTION_ASM_OP
  86
  87 /* Define this macro if jump tables (for `tablejump' insns) should be
  88    output in the text section, along with the assembler instructions.
  89    Otherwise, the readonly data section is used.  */
  90 #define JUMP_TABLES_IN_TEXT_SECTION 1
  91
  92 #undef READONLY_DATA_SECTION
  93 #define READONLY_DATA_SECTION   rdata_section
  94 #undef RDATA_SECTION_ASM_OP
  95 #define RDATA_SECTION_ASM_OP    "\t.section .rdata"
  96
  97 #undef CTORS_SECTION_ASM_OP
  98 #define CTORS_SECTION_ASM_OP    "\t.section .ctors,\"x\""
  99 #undef DTORS_SECTION_ASM_OP
 100 #define DTORS_SECTION_ASM_OP    "\t.section .dtors,\"x\""
 101
 102 /* A list of other sections which the compiler might be "in" at any
 103    given time.  */
 104
 105 #undef EXTRA_SECTIONS
 106 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
 107
 108 #define SUBTARGET_EXTRA_SECTIONS
 109
 110 /* A list of extra section function definitions.  */
 111
 112 #undef EXTRA_SECTION_FUNCTIONS
 113 #define EXTRA_SECTION_FUNCTIONS \
 114   RDATA_SECTION_FUNCTION        \
 115   CTORS_SECTION_FUNCTION        \
 116   DTORS_SECTION_FUNCTION        \
 117   SUBTARGET_EXTRA_SECTION_FUNCTIONS
 118
 119 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
 120
 121 #define RDATA_SECTION_FUNCTION \
 122 void                                                                    \
 123 rdata_section ()                                                        \
 124 {                                                                       \
 125   if (in_section != in_rdata)                                           \
 126     {                                                                   \
 127       fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);             \
 128       in_section = in_rdata;                                            \
 129     }                                                                   \
 130 }
 131
 132 #define CTORS_SECTION_FUNCTION \
 133 void                                                                    \
 134 ctors_section ()                                                        \
 135 {                                                                       \
 136   if (in_section != in_ctors)                                           \
 137     {                                                                   \
 138       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);             \
 139       in_section = in_ctors;                                            \
 140     }                                                                   \
 141 }
 142
 143 #define DTORS_SECTION_FUNCTION \
 144 void                                                                    \
 145 dtors_section ()                                                        \
 146 {                                                                       \
 147   if (in_section != in_dtors)                                           \
 148     {                                                                   \
 149       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);             \
 150       in_section = in_dtors;                                            \
 151     }                                                                   \
 152 }
 153 \f
 154 /* Support the ctors/dtors sections for g++.  */
 155
 156 #define INT_ASM_OP ".word"
 157
 158 /* A C statement (sans semicolon) to output an element in the table of
 159    global constructors.  */
 160 #undef ASM_OUTPUT_CONSTRUCTOR
 161 #define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
 162 do {                                            \
 163   ctors_section ();                             \
 164   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 165   assemble_name (STREAM, NAME);                 \
 166   fprintf (STREAM, "\n");                       \
 167 } while (0)
 168
 169 /* A C statement (sans semicolon) to output an element in the table of
 170    global destructors.  */
 171 #undef ASM_OUTPUT_DESTRUCTOR
 172 #define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
 173 do {                                            \
 174   dtors_section ();                             \
 175   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 176   assemble_name (STREAM, NAME);                 \
 177   fprintf (STREAM, "\n");                       \
 178 } while (0)
 179
 180 /* __CTOR_LIST__ and __DTOR_LIST__ must be defined by the linker script.  */
 181 #define CTOR_LISTS_DEFINED_EXTERNALLY
 182
 183 #undef DO_GLOBAL_CTORS_BODY
 184 #undef DO_GLOBAL_DTORS_BODY
 185
 186 /* The ARM development system has atexit and doesn't have _exit,
 187    so define this for now.  */
 188 #define HAVE_ATEXIT
 189
 190 /* The ARM development system defines __main.  */
 191 #define NAME__MAIN "__gccmain"
 192 #define SYMBOL__MAIN __gccmain