gcc/config/i386/i386-interix.h

   1 /* Target definitions for GCC for Intel 80386 running Interix
   2    Parts Copyright (C) 1991, 1999, 2000, 2002, 2003, 2004
   3    Free Software Foundation, Inc.
   4
   5    Parts:
   6      by Douglas B. Rupp (drupp@cs.washington.edu).
   7      by Ron Guilmette (rfg@netcom.com).
   8      by Donn Terry (donn@softway.com).
   9      by Mumit Khan (khan@xraylith.wisc.edu).
  10
  11 This file is part of GCC.
  12
  13 GCC is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 2, or (at your option)
  16 any later version.
  17
  18 GCC is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with GCC; see the file COPYING.  If not, write to
  25 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  26 Boston, MA 02110-1301, USA.  */
  27
  28 /* The rest must follow.  */
  29
  30 #define DBX_DEBUGGING_INFO 1
  31 #define SDB_DEBUGGING_INFO 1
  32 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  33
  34 #define HANDLE_SYSV_PRAGMA 1
  35 #undef HANDLE_PRAGMA_WEAK  /* until the link format can handle it */
  36
  37 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  38    and returns float values in the 387 and needs stack probes
  39    We also align doubles to 64-bits for MSVC default compatibility
  40    We do bitfields MSVC-compatibly by default, too.  */
  41 #undef TARGET_SUBTARGET_DEFAULT
  42 #define TARGET_SUBTARGET_DEFAULT \
  43    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE | \
  44     MASK_ALIGN_DOUBLE | MASK_MS_BITFIELD_LAYOUT)
  45
  46 #undef TARGET_CPU_DEFAULT
  47 #define TARGET_CPU_DEFAULT 2 /* 486 */
  48
  49 #define WCHAR_TYPE_SIZE 16
  50 #define WCHAR_TYPE "short unsigned int"
  51
  52 /* WinNT (and thus Interix) use unsigned int */
  53 #define SIZE_TYPE "unsigned int"
  54
  55 #define ASM_LOAD_ADDR(loc, reg)   "     leal " #loc "," #reg "\n"
  56
  57 #define TARGET_DECLSPEC 1
  58
  59 /* cpp handles __STDC__ */
  60 #define TARGET_OS_CPP_BUILTINS()                                        \
  61   do                                                                    \
  62     {                                                                   \
  63         builtin_define ("__INTERIX");                                   \
  64         builtin_define ("__OPENNT");                                    \
  65         builtin_define ("_M_IX86=300");                                 \
  66         builtin_define ("_X86_=1");                                     \
  67         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  68         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  69         builtin_assert ("system=unix");                                 \
  70         builtin_assert ("system=interix");                              \
  71         if (preprocessing_asm_p ())                                     \
  72           builtin_define_std ("LANGUAGE_ASSEMBLY");                     \
  73         else                                                            \
  74           {                                                             \
  75              builtin_define_std ("LANGUAGE_C");                         \
  76              if (c_dialect_cxx ())                                      \
  77                builtin_define_std ("LANGUAGE_C_PLUS_PLUS");             \
  78              if (c_dialect_objc ())                                     \
  79                builtin_define_std ("LANGUAGE_OBJECTIVE_C");             \
  80           }                                                             \
  81     }                                                                   \
  82   while (0)
  83
  84 #undef CPP_SPEC
  85 /* Write out the correct language type definition for the header files.
  86    Unless we have assembler language, write out the symbols for C.
  87    mieee is an Alpha specific variant.  Cross polination a bad idea.
  88    */
  89 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  90 -isystem %$INTERIX_ROOT/usr/include"
  91
  92 #define TARGET_VERSION fprintf (stderr, " (i386 Interix)");
  93
  94 /* The global __fltused is necessary to cause the printf/scanf routines
  95    for outputting/inputting floating point numbers to be loaded.  Since this
  96    is kind of hard to detect, we just do it all the time.  */
  97 #undef X86_FILE_START_FLTUSED
  98 #define X86_FILE_START_FLTUSED 1
  99
 100 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
 101    ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
 102    corresponds to a particular byte value [0..255].  For any
 103    given byte value, if the value in the corresponding table
 104    position is zero, the given character can be output directly.
 105    If the table value is 1, the byte must be output as a \ooo
 106    octal escape.  If the tables value is anything else, then the
 107    byte value should be output as a \ followed by the value
 108    in the table.  Note that we can use standard UN*X escape
 109    sequences for many control characters, but we don't use
 110    \a to represent BEL because some svr4 assemblers (e.g. on
 111    the i386) don't know about that.  Also, we don't use \v
 112    since some versions of gas, such as 2.2 did not accept it.  */
 113
 114 #define ESCAPES \
 115 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 116 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 117 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
 118 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
 119 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 120 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 121 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 122 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
 123
 124 /* Some svr4 assemblers have a limit on the number of characters which
 125    can appear in the operand of a .string directive.  If your assembler
 126    has such a limitation, you should define STRING_LIMIT to reflect that
 127    limit.  Note that at least some svr4 assemblers have a limit on the
 128    actual number of bytes in the double-quoted string, and that they
 129    count each character in an escape sequence as one byte.  Thus, an
 130    escape sequence like \377 would count as four bytes.
 131
 132    If your target assembler doesn't support the .string directive, you
 133    should define this to zero.
 134 */
 135
 136 #define STRING_LIMIT    ((unsigned) 256)
 137
 138 #define STRING_ASM_OP   "\t.string\t"
 139
 140 /* The routine used to output NUL terminated strings.  We use a special
 141    version of this for most svr4 targets because doing so makes the
 142    generated assembly code more compact (and thus faster to assemble)
 143    as well as more readable, especially for targets like the i386
 144    (where the only alternative is to output character sequences as
 145    comma separated lists of numbers).  */
 146
 147 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR)                            \
 148   do                                                                    \
 149     {                                                                   \
 150       const unsigned char *_limited_str =                               \
 151         (const unsigned char *) (STR);                                  \
 152       unsigned ch;                                                      \
 153       fprintf ((FILE), "%s\"", STRING_ASM_OP);                          \
 154       for (; (ch = *_limited_str); _limited_str++)                      \
 155         {                                                               \
 156           int escape = ESCAPES[ch];                                     \
 157           switch (escape)                                               \
 158             {                                                           \
 159             case 0:                                                     \
 160               putc (ch, (FILE));                                        \
 161               break;                                                    \
 162             case 1:                                                     \
 163               fprintf ((FILE), "\\%03o", ch);                           \
 164               break;                                                    \
 165             default:                                                    \
 166               putc ('\\', (FILE));                                      \
 167               putc (escape, (FILE));                                    \
 168               break;                                                    \
 169             }                                                           \
 170         }                                                               \
 171       fprintf ((FILE), "\"\n");                                         \
 172     }                                                                   \
 173   while (0)
 174
 175 /* The routine used to output sequences of byte values.  We use a special
 176    version of this for most svr4 targets because doing so makes the
 177    generated assembly code more compact (and thus faster to assemble)
 178    as well as more readable.  Note that if we find subparts of the
 179    character sequence which end with NUL (and which are shorter than
 180    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 181
 182 #undef ASM_OUTPUT_ASCII
 183 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 184   do                                                                    \
 185     {                                                                   \
 186       const unsigned char *_ascii_bytes =                               \
 187         (const unsigned char *) (STR);                                  \
 188       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
 189       unsigned bytes_in_chunk = 0;                                      \
 190       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 191         {                                                               \
 192           const unsigned char *p;                                       \
 193           if (bytes_in_chunk >= 64)                                     \
 194             {                                                           \
 195               fputc ('\n', (FILE));                                     \
 196               bytes_in_chunk = 0;                                       \
 197             }                                                           \
 198           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
 199             continue;                                                   \
 200           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
 201             {                                                           \
 202               if (bytes_in_chunk > 0)                                   \
 203                 {                                                       \
 204                   fputc ('\n', (FILE));                                 \
 205                   bytes_in_chunk = 0;                                   \
 206                 }                                                       \
 207               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 208               _ascii_bytes = p;                                         \
 209             }                                                           \
 210           else                                                          \
 211             {                                                           \
 212               if (bytes_in_chunk == 0)                                  \
 213                 fprintf ((FILE), "\t.byte\t");                          \
 214               else                                                      \
 215                 fputc (',', (FILE));                                    \
 216               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
 217               bytes_in_chunk += 5;                                      \
 218             }                                                           \
 219         }                                                               \
 220       if (bytes_in_chunk > 0)                                           \
 221         fprintf ((FILE), "\n");                                         \
 222     }                                                                   \
 223   while (0)
 224
 225 /* Emit code to check the stack when allocating more that 4000
 226    bytes in one go.  */
 227
 228 #define CHECK_STACK_LIMIT 0x1000
 229
 230 /* the following are OSF linker (not gld) specific... we don't want them */
 231 #undef HAS_INIT_SECTION
 232 #undef LD_INIT_SWITCH
 233 #undef LD_FINI_SWITCH
 234
 235 /* The following are needed for us to be able to use winnt.c, but are not
 236    otherwise meaningful to Interix.  (The functions that use these are
 237    never called because we don't do DLLs.) */
 238 #define TARGET_NOP_FUN_DLLIMPORT 1
 239 #define drectve_section()  /* nothing */
 240
 241 /* Objective-C has its own packing rules...
 242    Objc tries to parallel the code in stor-layout.c at runtime
 243    (see libobjc/encoding.c).  This (compile-time) packing info isn't
 244    available at runtime, so it's hopeless to try.
 245
 246    And if the user tries to set the flag for objc, give an error
 247    so he has some clue.  */
 248
 249 #undef  SUBTARGET_OVERRIDE_OPTIONS
 250 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 251 do {                                                                    \
 252   if (strcmp (lang_hooks.name, "GNU Objective-C") == 0)                 \
 253     {                                                                   \
 254       if ((target_flags & MASK_MS_BITFIELD_LAYOUT) != 0                 \
 255           && (target_flags_explicit & MASK_MS_BITFIELD_LAYOUT) != 0)    \
 256         {                                                               \
 257            error ("ms-bitfields not supported for objc");               \
 258         }                                                               \
 259       target_flags &= ~MASK_MS_BITFIELD_LAYOUT;                         \
 260     }                                                                   \
 261 } while (0)
 262
 263 #define EH_FRAME_IN_DATA_SECTION
 264
 265 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rdata,\"r\""
 266
 267 /* The MS compilers take alignment as a number of bytes, so we do as well */
 268 #undef ASM_OUTPUT_ALIGN
 269 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 270   if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
 271
 272 /* The linker will take care of this, and having them causes problems with
 273    ld -r (specifically -rU).  */
 274 #define CTOR_LISTS_DEFINED_EXTERNALLY 1
 275
 276 #define SET_ASM_OP      "\t.set\t"
 277 /* Output a definition (implements alias) */
 278 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 279 do                                                                      \
 280 {                                                                       \
 281     fprintf ((FILE), "%s", SET_ASM_OP);                                 \
 282     assemble_name (FILE, LABEL1);                                       \
 283     fprintf (FILE, ",");                                                \
 284     assemble_name (FILE, LABEL2);                                       \
 285     fprintf (FILE, "\n");                                               \
 286     }                                                                   \
 287 while (0)
 288
 289 #define HOST_PTR_PRINTF "%p"
 290 #define HOST_PTR_AS_INT unsigned long
 291
 292 #define PCC_BITFIELD_TYPE_MATTERS 1
 293
 294 /* The following two flags are usually "off" for i386, because some non-gnu
 295    tools (for the i386) don't handle them.  However, we don't have that
 296    problem, so....  */
 297
 298 /* Forward references to tags are allowed.  */
 299 #define SDB_ALLOW_FORWARD_REFERENCES
 300
 301 /* Unknown tags are also allowed.  */
 302 #define SDB_ALLOW_UNKNOWN_REFERENCES
 303
 304 /* The integer half of this list needs to be constant.  However, there's
 305    a lot of disagreement about what the floating point adjustments should
 306    be.  We pick one that works with gdb.  (The underlying problem is
 307    what to do about the segment registers.  Since we have access to them
 308    from /proc, we'll allow them to be accessed in gdb, even tho the
 309    gcc compiler can't generate them.  (There's some evidence that
 310    MSVC does, but possibly only for certain special "canned" sequences.) */
 311
 312 #undef DBX_REGISTER_NUMBER
 313 #define DBX_REGISTER_NUMBER(n) \
 314 (TARGET_64BIT ? dbx64_register_map[n] \
 315  : (n) == 0 ? 0 \
 316  : (n) == 1 ? 2 \
 317  : (n) == 2 ? 1 \
 318  : (n) == 3 ? 3 \
 319  : (n) == 4 ? 6 \
 320  : (n) == 5 ? 7 \
 321  : (n) == 6 ? 5 \
 322  : (n) == 7 ? 4 \
 323  : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+8 \
 324  : (-1))
 325
 326 /* Define this macro if references to a symbol must be treated
 327    differently depending on something about the variable or
 328    function named by the symbol (such as what section it is in).  */
 329
 330 #undef TARGET_ENCODE_SECTION_INFO
 331 #define TARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info
 332 #undef  TARGET_STRIP_NAME_ENCODING
 333 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 334
 335 #if 0
 336 /* Turn this back on when the linker is updated to handle grouped
 337    .data$ sections correctly. See corresponding note in i386/interix.c.
 338    MK.  */
 339
 340 /* Interix uses explicit import from shared libraries.  */
 341 #define MULTIPLE_SYMBOL_SPACES 1
 342
 343 extern void i386_pe_unique_section (tree, int);
 344 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 345 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 346
 347 #define SUPPORTS_ONE_ONLY 1
 348 #endif /* 0 */
 349
 350 /* Switch into a generic section.  */
 351 #define TARGET_ASM_NAMED_SECTION  default_pe_asm_named_section
 352
 353 /* DWARF2 Unwinding doesn't work with exception handling yet.  */
 354 #define DWARF2_UNWIND_INFO 0
 355
 356 /* Don't assume anything about the header files.  */
 357 #define NO_IMPLICIT_EXTERN_C
 358
 359 /* MSVC returns structs of up to 8 bytes via registers.  */
 360
 361 #define DEFAULT_PCC_STRUCT_RETURN 0
 362
 363 #undef RETURN_IN_MEMORY
 364 #define RETURN_IN_MEMORY(TYPE) \
 365   (TYPE_MODE (TYPE) == BLKmode || \
 366      (AGGREGATE_TYPE_P (TYPE) && int_size_in_bytes(TYPE) > 8 ))