gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "dbxcoff.h"
  23
  24 /* Don't assume anything about the header files. */
  25 #define NO_IMPLICIT_EXTERN_C
  26
  27 #define HANDLE_SYSV_PRAGMA
  28
  29 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  30 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  31
  32 #define YES_UNDERSCORES
  33
  34 #include "i386/gas.h"
  35
  36 /* If defined, a C expression whose value is a string containing the
  37    assembler operation to identify the following data as
  38    uninitialized global data.  If not defined, and neither
  39    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  40    uninitialized global data will be output in the data section if
  41    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  42    used.  */
  43 #undef BSS_SECTION_ASM_OP
  44 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  45
  46 /* Define the name of the .ctor section.  */
  47 #undef CTORS_SECTION_ASM_OP
  48 #define CTORS_SECTION_ASM_OP "\t.section .ctor"
  49
  50 /* Define the name of the .data section.  */
  51 #undef DATA_SECTION_ASM_OP
  52 #define DATA_SECTION_ASM_OP "\t.section .data"
  53
  54 /* Define the name of the .dtor section.  */
  55 #undef DTORS_SECTION_ASM_OP
  56 #define DTORS_SECTION_ASM_OP "\t.section .dtor"
  57
  58 /* Define the name of the .eh_frame section.  */
  59 #undef EH_FRAME_SECTION_ASM_OP
  60 #define EH_FRAME_SECTION_ASM_OP "\t.section .eh_frame"
  61
  62 /* Define the name of the .ident op.  */
  63 #undef IDENT_ASM_OP
  64 #define IDENT_ASM_OP "\t.ident"
  65
  66 /* Define the name of the .int op.  */
  67 #undef INT_ASM_OP
  68 #define INT_ASM_OP "\t.long"
  69
  70 /* Enable alias attribute support.  */
  71 #ifndef SET_ASM_OP
  72 #define SET_ASM_OP "\t.set"
  73 #endif
  74
  75 /* Define the name of the .text section.  */
  76 #undef TEXT_SECTION_ASM_OP
  77 #define TEXT_SECTION_ASM_OP "\t.section .text"
  78
  79 /* Search for as.exe and ld.exe in DJGPP's binary directory. */
  80 #define MD_EXEC_PREFIX "$DJDIR/bin/"
  81
  82 /* Correctly handle absolute filename detection in cp/xref.c */
  83 #define FILE_NAME_ABSOLUTE_P(NAME) \
  84         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  85         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  86
  87 #undef CPP_PREDEFINES
  88 #define CPP_PREDEFINES "-DGO32 -DDJGPP=2 -D__MSDOS__ -Asystem(msdos)"
  89
  90 /* Include <sys/version.h> so __DJGPP__ and __DJGPP_MINOR__ are defined.  */
  91 #undef CPP_SPEC
  92 #define CPP_SPEC "-remap %(cpp_cpu) %{posix:-D_POSIX_SOURCE} \
  93   -imacros %s../include/sys/version.h"
  94
  95 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  96    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  97    before library search directories are known by the linker.
  98    This avoids problems when specs file is not available. An alternate way,
  99    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
 100 */
 101
 102 #undef LINK_COMMAND_SPEC
 103 #define LINK_COMMAND_SPEC \
 104 "%{!fsyntax-only: \
 105 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 106 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
 107 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
 108 \t%{static:} %{L*} %D %o\
 109 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
 110 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
 111 \t-Tdjgpp.djl %{T*}}}}}}}\n\
 112 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
 113
 114 /* Always just link in 'libc.a'.  */
 115 #undef LIB_SPEC
 116 #define LIB_SPEC "-lc"
 117
 118 /* Pick the right startup code depending on the -pg flag.  */
 119 #undef STARTFILE_SPEC
 120 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
 121
 122 /* Make sure that gcc will not look for .h files in /usr/local/include
 123    unless user explicitly requests it.  */
 124 #undef LOCAL_INCLUDE_DIR
 125
 126 #undef EXTRA_SECTIONS
 127 #define EXTRA_SECTIONS in_ctor, in_dtor
 128
 129 #undef EXTRA_SECTION_FUNCTIONS
 130 #define EXTRA_SECTION_FUNCTIONS                                 \
 131   CTOR_SECTION_FUNCTION                                         \
 132   DTOR_SECTION_FUNCTION
 133
 134 #define CTOR_SECTION_FUNCTION                                   \
 135 void                                                            \
 136 ctor_section ()                                                 \
 137 {                                                               \
 138   if (in_section != in_ctor)                                    \
 139     {                                                           \
 140       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);             \
 141       in_section = in_ctor;                                     \
 142     }                                                           \
 143 }
 144
 145 #define DTOR_SECTION_FUNCTION                                   \
 146 void                                                            \
 147 dtor_section ()                                                 \
 148 {                                                               \
 149   if (in_section != in_dtor)                                    \
 150     {                                                           \
 151       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);             \
 152       in_section = in_dtor;                                     \
 153     }                                                           \
 154 }
 155
 156 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)       \
 157   do {                                          \
 158     ctor_section ();                            \
 159     fprintf (FILE, "%s\t", ASM_LONG);           \
 160     assemble_name (FILE, NAME);                 \
 161     fprintf (FILE, "\n");                       \
 162   } while (0)
 163
 164 /* Allow (eg) __attribute__((section "locked")) to work */
 165 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC)\
 166   do {                                          \
 167     fprintf (FILE, "\t.section %s\n", NAME);    \
 168   } while (0)
 169
 170 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)        \
 171   do {                                          \
 172     dtor_section ();                            \
 173     fprintf (FILE, "%s\t", ASM_LONG);           \
 174     assemble_name (FILE, NAME);                 \
 175     fprintf (FILE, "\n");                       \
 176   } while (0)
 177
 178 /* Output at beginning of assembler file.  */
 179 /* The .file command should always begin the output.  */
 180
 181 #undef ASM_FILE_START
 182 #define ASM_FILE_START(FILE)                                            \
 183   do {                                                                  \
 184         output_file_directive (FILE, main_input_filename);              \
 185   } while (0)
 186
 187 /* This is how to output an assembler line
 188    that says to advance the location counter
 189    to a multiple of 2**LOG bytes.  */
 190
 191 #undef ASM_OUTPUT_ALIGN
 192 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 193   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 194
 195 /* This is how to output a global symbol in the BSS section.  */
 196 #undef ASM_OUTPUT_ALIGNED_BSS
 197 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 198   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 199
 200 /* This is how to tell assembler that a symbol is weak  */
 201 #undef ASM_WEAKEN_LABEL
 202 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 203   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 204        fputc ('\n', FILE); } while (0)
 205
 206 /* djgpp automatically calls its own version of __main, so don't define one
 207    in libgcc, nor call one in main().  */
 208 #define HAS_INIT_SECTION
 209
 210 /* Definitions to set wchar_t type to 'unsigned short int' to help out
 211    add-on Windows compilers for DJGPP. */
 212 #define WCHAR_UNSIGNED 1
 213 #define WCHAR_TYPE_SIZE 16
 214 #define WCHAR_TYPE "short unsigned int"
 215
 216 /* Used to be defined in xm-djgpp.h, but moved here for cross-compilers.  */
 217 #define LIBSTDCXX "-lstdcxx"
 218
 219 /* Add command line option -mbnu210 to indicate we can use binutil 2.10's features.  */
 220 #undef MASK_BNU210
 221 #define MASK_BNU210 (0x40000000)
 222
 223 #undef SUBTARGET_SWITCHES
 224 #define SUBTARGET_SWITCHES              \
 225   { "bnu210", MASK_BNU210, "Enable weak symbol and enhanced C++ template support. Binutils 2.9.5.1 or higher required." }, \
 226   { "no-bnu210", -MASK_BNU210, "Disable weak symbol and enhanced C++ template support." },
 227
 228 /* Weak symbols and .gnu.linkonce are only in the binutils snapshots
 229    and binutils-2.10.  So do it only when -mbnu210 is specified.  */
 230 #undef SUPPORTS_WEAK
 231 #define SUPPORTS_WEAK (target_flags & MASK_BNU210)
 232
 233 #undef SUPPORTS_ONE_ONLY
 234 #define SUPPORTS_ONE_ONLY (target_flags & MASK_BNU210)
 235
 236 /* Support for C++ templates.  */
 237 #undef MAKE_DECL_ONE_ONLY
 238 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 239
 240 /* Additional support for C++ templates and support for
 241    garbage collection.  */
 242 #undef UNIQUE_SECTION_P
 243 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
 244
 245 #undef UNIQUE_SECTION
 246 #define UNIQUE_SECTION(DECL,RELOC)                              \
 247 do {                                                            \
 248   int len;                                                      \
 249   char *name, *string, *prefix;                                 \
 250                                                                 \
 251   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 252                                                                 \
 253   if (! DECL_ONE_ONLY (DECL))                                   \
 254     {                                                           \
 255       if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
 256         prefix = ".text.";                                      \
 257       else if (DECL_READONLY_SECTION (DECL, RELOC))             \
 258         prefix = ".rodata.";                                    \
 259       else                                                      \
 260         prefix = ".data.";                                      \
 261     }                                                           \
 262   else if (TREE_CODE (DECL) == FUNCTION_DECL)                   \
 263     prefix = ".gnu.linkonce.t.";                                \
 264   else if (DECL_READONLY_SECTION (DECL, RELOC))                 \
 265     prefix = ".gnu.linkonce.r.";                                \
 266   else                                                          \
 267     prefix = ".gnu.linkonce.d.";                                \
 268                                                                 \
 269   len = strlen (name) + strlen (prefix);                        \
 270   string = alloca (len + 1);                                    \
 271   sprintf (string, "%s%s", prefix, name);                       \
 272                                                                 \
 273   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 274 } while (0)