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, 1999 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 #undef  LOCAL_LABEL_PREFIX
  48 #define LOCAL_LABEL_PREFIX "."
  49
  50 /* Note - it is important that this definition matches the one in coff.h */
  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   fprintf ((STREAM), "%s Generated by gcc %s for Thumb/coff\n", \
  64            ASM_COMMENT_START, version_string);                  \
  65   fprintf ((STREAM), ASM_APP_OFF);                              \
  66 } while (0)
  67
  68 /* A C statement to output something to the assembler file to switch to section
  69    NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or
  70    NULL_TREE.  Some target formats do not support arbitrary sections.  Do not
  71    define this macro in such cases.  */
  72 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
  73 do {                                                            \
  74   if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL)              \
  75     fprintf (STREAM, "\t.section %s,\"x\"\n", (NAME));          \
  76   else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC))       \
  77     fprintf (STREAM, "\t.section %s,\"\"\n", (NAME));           \
  78   else                                                          \
  79     fprintf (STREAM, "\t.section %s,\"w\"\n", (NAME));          \
  80 } while (0)
  81 \f
  82 /* Support the ctors/dtors and other sections.  */
  83
  84 #undef INIT_SECTION_ASM_OP
  85
  86 /* Define this macro if jump tables (for `tablejump' insns) should be
  87    output in the text section, along with the assembler instructions.
  88    Otherwise, the readonly data section is used.  */
  89 #define JUMP_TABLES_IN_TEXT_SECTION 1
  90
  91 #undef READONLY_DATA_SECTION
  92 #define READONLY_DATA_SECTION   rdata_section
  93 #undef RDATA_SECTION_ASM_OP
  94 #define RDATA_SECTION_ASM_OP    "\t.section .rdata"
  95
  96 #undef CTORS_SECTION_ASM_OP
  97 #define CTORS_SECTION_ASM_OP    "\t.section .ctors,\"x\""
  98 #undef DTORS_SECTION_ASM_OP
  99 #define DTORS_SECTION_ASM_OP    "\t.section .dtors,\"x\""
 100
 101 /* A list of other sections which the compiler might be "in" at any
 102    given time.  */
 103
 104 #undef EXTRA_SECTIONS
 105 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_rdata, in_ctors, in_dtors
 106
 107 #define SUBTARGET_EXTRA_SECTIONS
 108
 109 /* A list of extra section function definitions.  */
 110
 111 #undef EXTRA_SECTION_FUNCTIONS
 112 #define EXTRA_SECTION_FUNCTIONS \
 113   RDATA_SECTION_FUNCTION        \
 114   CTORS_SECTION_FUNCTION        \
 115   DTORS_SECTION_FUNCTION        \
 116   SUBTARGET_EXTRA_SECTION_FUNCTIONS
 117
 118 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
 119
 120 #define RDATA_SECTION_FUNCTION \
 121 void                                                                    \
 122 rdata_section ()                                                        \
 123 {                                                                       \
 124   if (in_section != in_rdata)                                           \
 125     {                                                                   \
 126       fprintf (asm_out_file, "%s\n", RDATA_SECTION_ASM_OP);             \
 127       in_section = in_rdata;                                            \
 128     }                                                                   \
 129 }
 130
 131 #define CTORS_SECTION_FUNCTION \
 132 void                                                                    \
 133 ctors_section ()                                                        \
 134 {                                                                       \
 135   if (in_section != in_ctors)                                           \
 136     {                                                                   \
 137       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);             \
 138       in_section = in_ctors;                                            \
 139     }                                                                   \
 140 }
 141
 142 #define DTORS_SECTION_FUNCTION \
 143 void                                                                    \
 144 dtors_section ()                                                        \
 145 {                                                                       \
 146   if (in_section != in_dtors)                                           \
 147     {                                                                   \
 148       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);             \
 149       in_section = in_dtors;                                            \
 150     }                                                                   \
 151 }
 152 \f
 153 /* Support the ctors/dtors sections for g++.  */
 154
 155 #define INT_ASM_OP ".word"
 156
 157 /* A C statement (sans semicolon) to output an element in the table of
 158    global constructors.  */
 159 #undef ASM_OUTPUT_CONSTRUCTOR
 160 #define ASM_OUTPUT_CONSTRUCTOR(STREAM,NAME) \
 161 do {                                            \
 162   ctors_section ();                             \
 163   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 164   assemble_name (STREAM, NAME);                 \
 165   fprintf (STREAM, "\n");                       \
 166 } while (0)
 167
 168 /* A C statement (sans semicolon) to output an element in the table of
 169    global destructors.  */
 170 #undef ASM_OUTPUT_DESTRUCTOR
 171 #define ASM_OUTPUT_DESTRUCTOR(STREAM,NAME) \
 172 do {                                            \
 173   dtors_section ();                             \
 174   fprintf (STREAM, "\t%s\t ", INT_ASM_OP);      \
 175   assemble_name (STREAM, NAME);                 \
 176   fprintf (STREAM, "\n");                       \
 177 } while (0)
 178
 179 /* __CTOR_LIST__ and __DTOR_LIST__ must be defined by the linker script.  */
 180 #define CTOR_LISTS_DEFINED_EXTERNALLY
 181
 182 #undef DO_GLOBAL_CTORS_BODY
 183 #undef DO_GLOBAL_DTORS_BODY
 184
 185 /* The ARM development system defines __main.  */
 186 #define NAME__MAIN "__gccmain"
 187 #define SYMBOL__MAIN __gccmain