gcc/config/i386/i386-interix.h

   1 /* Target definitions for GNU compiler for Intel 80386 running Interix
   2    Parts Copyright (C) 1991, 1999, 2000, 2002 Free Software Foundation, Inc.
   3
   4    Parts:
   5      by Douglas B. Rupp (drupp@cs.washington.edu).
   6      by Ron Guilmette (rfg@netcom.com).
   7      by Donn Terry (donn@softway.com).
   8      by Mumit Khan (khan@xraylith.wisc.edu).
   9
  10 This file is part of GNU CC.
  11
  12 GNU CC is free software; you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation; either version 2, or (at your option)
  15 any later version.
  16
  17 GNU CC is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with GNU CC; see the file COPYING.  If not, write to
  24 the Free Software Foundation, 59 Temple Place - Suite 330,
  25 Boston, MA 02111-1307, USA.  */
  26
  27 /* The rest must follow.  */
  28
  29 #define DBX_DEBUGGING_INFO
  30 #define SDB_DEBUGGING_INFO
  31 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  32
  33 #define HANDLE_SYSV_PRAGMA
  34 #undef HANDLE_PRAGMA_WEAK  /* until the link format can handle it */
  35
  36 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  37    and returns float values in the 387 and needs stack probes
  38    We also align doubles to 64-bits for MSVC default compatibility */
  39 #undef TARGET_SUBTARGET_DEFAULT
  40 #define TARGET_SUBTARGET_DEFAULT \
  41    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE | \
  42     MASK_ALIGN_DOUBLE)
  43
  44 #undef TARGET_CPU_DEFAULT
  45 #define TARGET_CPU_DEFAULT 2 /* 486 */
  46
  47 #define WCHAR_TYPE_SIZE 16
  48 #define WCHAR_TYPE "short unsigned int"
  49
  50 /* WinNT (and thus Interix) use unsigned int */
  51 #define SIZE_TYPE "unsigned int"
  52
  53 #define ASM_LOAD_ADDR(loc, reg)   "     leal " #loc "," #reg "\n"
  54
  55 /* cpp handles __STDC__ */
  56 #define TARGET_OS_CPP_BUILTINS()                                        \
  57   do                                                                    \
  58     {                                                                   \
  59         builtin_define ("__INTERIX");                                   \
  60         builtin_define ("__OPENNT");                                    \
  61         builtin_define ("_M_IX86=300");                                 \
  62         builtin_define ("_X86_=1");                                     \
  63         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  64         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  65         builtin_define ("__declspec(x)=__attribute__((x))");            \
  66         builtin_assert ("system=unix");                                 \
  67         builtin_assert ("system=interix");                              \
  68         if (preprocessing_asm_p ())                                     \
  69           builtin_define_std ("LANGUAGE_ASSEMBLY");                     \
  70         else                                                            \
  71           {                                                             \
  72              builtin_define_std ("LANGUAGE_C");                         \
  73              if (c_language == clk_cplusplus)                           \
  74                builtin_define_std ("LANGUAGE_C_PLUS_PLUS");             \
  75              else if (c_language == clk_objective_c)                    \
  76                builtin_define_std ("LANGUAGE_OBJECTIVE_C");             \
  77           }                                                             \
  78     }                                                                   \
  79   while (0)
  80
  81 #undef CPP_SPEC
  82 /* Write out the correct language type definition for the header files.
  83    Unless we have assembler language, write out the symbols for C.
  84    mieee is an Alpha specific variant.  Cross polination a bad idea.
  85    */
  86 #define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \
  87 -isystem %$INTERIX_ROOT/usr/include"
  88
  89 #define TARGET_VERSION fprintf (stderr, " (i386 Interix)");
  90
  91 /* The global __fltused is necessary to cause the printf/scanf routines
  92    for outputting/inputting floating point numbers to be loaded.  Since this
  93    is kind of hard to detect, we just do it all the time.  */
  94
  95 #ifdef ASM_FILE_START
  96 #undef ASM_FILE_START
  97 #endif
  98 #define ASM_FILE_START(FILE) \
  99   do {  fprintf (FILE, "\t.file\t");                            \
 100         output_quoted_string (FILE, dump_base_name);            \
 101         fprintf (FILE, "\n");                                   \
 102         fprintf (FILE, ".global\t__fltused\n");                 \
 103   } while (0)
 104
 105 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
 106    ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
 107    corresponds to a particular byte value [0..255].  For any
 108    given byte value, if the value in the corresponding table
 109    position is zero, the given character can be output directly.
 110    If the table value is 1, the byte must be output as a \ooo
 111    octal escape.  If the tables value is anything else, then the
 112    byte value should be output as a \ followed by the value
 113    in the table.  Note that we can use standard UN*X escape
 114    sequences for many control characters, but we don't use
 115    \a to represent BEL because some svr4 assemblers (e.g. on
 116    the i386) don't know about that.  Also, we don't use \v
 117    since some versions of gas, such as 2.2 did not accept it.  */
 118
 119 #define ESCAPES \
 120 "\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\
 121 \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\
 122 \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\
 123 \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\
 124 \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\
 125 \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\
 126 \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\
 127 \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"
 128
 129 /* Some svr4 assemblers have a limit on the number of characters which
 130    can appear in the operand of a .string directive.  If your assembler
 131    has such a limitation, you should define STRING_LIMIT to reflect that
 132    limit.  Note that at least some svr4 assemblers have a limit on the
 133    actual number of bytes in the double-quoted string, and that they
 134    count each character in an escape sequence as one byte.  Thus, an
 135    escape sequence like \377 would count as four bytes.
 136
 137    If your target assembler doesn't support the .string directive, you
 138    should define this to zero.
 139 */
 140
 141 #define STRING_LIMIT    ((unsigned) 256)
 142
 143 #define STRING_ASM_OP   "\t.string\t"
 144
 145 /* The routine used to output NUL terminated strings.  We use a special
 146    version of this for most svr4 targets because doing so makes the
 147    generated assembly code more compact (and thus faster to assemble)
 148    as well as more readable, especially for targets like the i386
 149    (where the only alternative is to output character sequences as
 150    comma separated lists of numbers).   */
 151
 152 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR)                            \
 153   do                                                                    \
 154     {                                                                   \
 155       register const unsigned char *_limited_str =                      \
 156         (const unsigned char *) (STR);                                  \
 157       register unsigned ch;                                             \
 158       fprintf ((FILE), "%s\"", STRING_ASM_OP);                          \
 159       for (; (ch = *_limited_str); _limited_str++)                      \
 160         {                                                               \
 161           register int escape = ESCAPES[ch];                            \
 162           switch (escape)                                               \
 163             {                                                           \
 164             case 0:                                                     \
 165               putc (ch, (FILE));                                        \
 166               break;                                                    \
 167             case 1:                                                     \
 168               fprintf ((FILE), "\\%03o", ch);                           \
 169               break;                                                    \
 170             default:                                                    \
 171               putc ('\\', (FILE));                                      \
 172               putc (escape, (FILE));                                    \
 173               break;                                                    \
 174             }                                                           \
 175         }                                                               \
 176       fprintf ((FILE), "\"\n");                                         \
 177     }                                                                   \
 178   while (0)
 179
 180 /* The routine used to output sequences of byte values.  We use a special
 181    version of this for most svr4 targets because doing so makes the
 182    generated assembly code more compact (and thus faster to assemble)
 183    as well as more readable.  Note that if we find subparts of the
 184    character sequence which end with NUL (and which are shorter than
 185    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 186
 187 #undef ASM_OUTPUT_ASCII
 188 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 189   do                                                                    \
 190     {                                                                   \
 191       register const unsigned char *_ascii_bytes =                      \
 192         (const unsigned char *) (STR);                                  \
 193       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
 194       register unsigned bytes_in_chunk = 0;                             \
 195       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 196         {                                                               \
 197           register const unsigned char *p;                              \
 198           if (bytes_in_chunk >= 64)                                     \
 199             {                                                           \
 200               fputc ('\n', (FILE));                                     \
 201               bytes_in_chunk = 0;                                       \
 202             }                                                           \
 203           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
 204             continue;                                                   \
 205           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
 206             {                                                           \
 207               if (bytes_in_chunk > 0)                                   \
 208                 {                                                       \
 209                   fputc ('\n', (FILE));                                 \
 210                   bytes_in_chunk = 0;                                   \
 211                 }                                                       \
 212               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 213               _ascii_bytes = p;                                         \
 214             }                                                           \
 215           else                                                          \
 216             {                                                           \
 217               if (bytes_in_chunk == 0)                                  \
 218                 fprintf ((FILE), "\t.byte\t");                          \
 219               else                                                      \
 220                 fputc (',', (FILE));                                    \
 221               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
 222               bytes_in_chunk += 5;                                      \
 223             }                                                           \
 224         }                                                               \
 225       if (bytes_in_chunk > 0)                                           \
 226         fprintf ((FILE), "\n");                                         \
 227     }                                                                   \
 228   while (0)
 229
 230 /* Emit code to check the stack when allocating more that 4000
 231    bytes in one go.  */
 232
 233 #define CHECK_STACK_LIMIT 0x1000
 234
 235 /* the following are OSF linker (not gld) specific... we don't want them */
 236 #undef HAS_INIT_SECTION
 237 #undef LD_INIT_SWITCH
 238 #undef LD_FINI_SWITCH
 239
 240 #define EH_FRAME_IN_DATA_SECTION
 241
 242 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rdata,\"r\""
 243
 244 /* The MS compilers take alignment as a number of bytes, so we do as well */
 245 #undef ASM_OUTPUT_ALIGN
 246 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 247   if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
 248
 249 /* The linker will take care of this, and having them causes problems with
 250    ld -r (specifically -rU).  */
 251 #define CTOR_LISTS_DEFINED_EXTERNALLY 1
 252
 253 #define SET_ASM_OP      "\t.set\t"
 254 /* Output a definition (implements alias) */
 255 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 256 do                                                                      \
 257 {                                                                       \
 258     fprintf ((FILE), "%s", SET_ASM_OP);                                 \
 259     assemble_name (FILE, LABEL1);                                       \
 260     fprintf (FILE, ",");                                                \
 261     assemble_name (FILE, LABEL2);                                       \
 262     fprintf (FILE, "\n");                                               \
 263     }                                                                   \
 264 while (0)
 265
 266 #define HOST_PTR_PRINTF "%p"
 267 #define HOST_PTR_AS_INT unsigned long
 268
 269 #define PCC_BITFIELD_TYPE_MATTERS 1
 270 #define PCC_BITFIELD_TYPE_TEST TYPE_NATIVE(rec)
 271 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 272
 273 /* The following two flags are usually "off" for i386, because some non-gnu
 274    tools (for the i386) don't handle them.  However, we don't have that
 275    problem, so....  */
 276
 277 /* Forward references to tags are allowed.  */
 278 #define SDB_ALLOW_FORWARD_REFERENCES
 279
 280 /* Unknown tags are also allowed.  */
 281 #define SDB_ALLOW_UNKNOWN_REFERENCES
 282
 283 /* The integer half of this list needs to be constant.  However, there's
 284    a lot of disagreement about what the floating point adjustments should
 285    be.  We pick one that works with gdb.  (The underlying problem is
 286    what to do about the segment registers.  Since we have access to them
 287    from /proc, we'll allow them to be accessed in gdb, even tho the
 288    gcc compiler can't generate them.  (There's some evidence that
 289    MSVC does, but possibly only for certain special "canned" sequences.) */
 290
 291 #undef DBX_REGISTER_NUMBER
 292 #define DBX_REGISTER_NUMBER(n) \
 293 (TARGET_64BIT ? dbx64_register_map[n] \
 294  : (n) == 0 ? 0 \
 295  : (n) == 1 ? 2 \
 296  : (n) == 2 ? 1 \
 297  : (n) == 3 ? 3 \
 298  : (n) == 4 ? 6 \
 299  : (n) == 5 ? 7 \
 300  : (n) == 6 ? 5 \
 301  : (n) == 7 ? 4 \
 302  : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+8 \
 303  : (-1))
 304
 305 /* Define this macro if references to a symbol must be treated
 306    differently depending on something about the variable or
 307    function named by the symbol (such as what section it is in).  */
 308
 309 #undef TARGET_ENCODE_SECTION_INFO
 310 #define TARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info
 311 #undef  TARGET_STRIP_NAME_ENCODING
 312 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 313
 314 #if 0
 315 /* Turn this back on when the linker is updated to handle grouped
 316    .data$ sections correctly. See corresponding note in i386/interix.c.
 317    MK.  */
 318
 319 /* Define this macro if in some cases global symbols from one translation
 320    unit may not be bound to undefined symbols in another translation unit
 321    without user intervention.  For instance, under Microsoft Windows
 322    symbols must be explicitly imported from shared libraries (DLLs).  */
 323 #define MULTIPLE_SYMBOL_SPACES
 324
 325 extern void i386_pe_unique_section PARAMS ((tree, int));
 326 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 327
 328 #define SUPPORTS_ONE_ONLY 1
 329 #endif /* 0 */
 330
 331 /* Switch into a generic section.  */
 332 #define TARGET_ASM_NAMED_SECTION  default_pe_asm_named_section
 333
 334 /* DWARF2 Unwinding doesn't work with exception handling yet.  */
 335 #define DWARF2_UNWIND_INFO 0
 336
 337 /* Don't assume anything about the header files.  */
 338 #define NO_IMPLICIT_EXTERN_C
 339
 340 /* MSVC returns structs of up to 8 bytes via registers. */
 341
 342 #define DEFAULT_PCC_STRUCT_RETURN 0
 343
 344 #undef RETURN_IN_MEMORY
 345 #define RETURN_IN_MEMORY(TYPE) \
 346   (TYPE_MODE (TYPE) == BLKmode || \
 347      (AGGREGATE_TYPE_P (TYPE) && int_size_in_bytes(TYPE) > 8 ))