i386-interix.h revision 132718
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 11This file is part of GCC. 12 13GCC is free software; you can redistribute it and/or modify 14it under the terms of the GNU General Public License as published by 15the Free Software Foundation; either version 2, or (at your option) 16any later version. 17 18GCC is distributed in the hope that it will be useful, 19but WITHOUT ANY WARRANTY; without even the implied warranty of 20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21GNU General Public License for more details. 22 23You should have received a copy of the GNU General Public License 24along with GCC; see the file COPYING. If not, write to 25the Free Software Foundation, 59 Temple Place - Suite 330, 26Boston, MA 02111-1307, 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/* cpp handles __STDC__ */ 58#define TARGET_OS_CPP_BUILTINS() \ 59 do \ 60 { \ 61 builtin_define ("__INTERIX"); \ 62 builtin_define ("__OPENNT"); \ 63 builtin_define ("_M_IX86=300"); \ 64 builtin_define ("_X86_=1"); \ 65 builtin_define ("__stdcall=__attribute__((__stdcall__))"); \ 66 builtin_define ("__cdecl=__attribute__((__cdecl__))"); \ 67 builtin_define ("__declspec(x)=__attribute__((x))"); \ 68 builtin_assert ("system=unix"); \ 69 builtin_assert ("system=interix"); \ 70 if (preprocessing_asm_p ()) \ 71 builtin_define_std ("LANGUAGE_ASSEMBLY"); \ 72 else \ 73 { \ 74 builtin_define_std ("LANGUAGE_C"); \ 75 if (c_dialect_cxx ()) \ 76 builtin_define_std ("LANGUAGE_C_PLUS_PLUS"); \ 77 if (c_dialect_objc ()) \ 78 builtin_define_std ("LANGUAGE_OBJECTIVE_C"); \ 79 } \ 80 } \ 81 while (0) 82 83#undef CPP_SPEC 84/* Write out the correct language type definition for the header files. 85 Unless we have assembler language, write out the symbols for C. 86 mieee is an Alpha specific variant. Cross polination a bad idea. 87 */ 88#define CPP_SPEC "-remap %{posix:-D_POSIX_SOURCE} \ 89-isystem %$INTERIX_ROOT/usr/include" 90 91#define TARGET_VERSION fprintf (stderr, " (i386 Interix)"); 92 93/* The global __fltused is necessary to cause the printf/scanf routines 94 for outputting/inputting floating point numbers to be loaded. Since this 95 is kind of hard to detect, we just do it all the time. */ 96#undef X86_FILE_START_FLTUSED 97#define X86_FILE_START_FLTUSED 1 98 99/* A table of bytes codes used by the ASM_OUTPUT_ASCII and 100 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table 101 corresponds to a particular byte value [0..255]. For any 102 given byte value, if the value in the corresponding table 103 position is zero, the given character can be output directly. 104 If the table value is 1, the byte must be output as a \ooo 105 octal escape. If the tables value is anything else, then the 106 byte value should be output as a \ followed by the value 107 in the table. Note that we can use standard UN*X escape 108 sequences for many control characters, but we don't use 109 \a to represent BEL because some svr4 assemblers (e.g. on 110 the i386) don't know about that. Also, we don't use \v 111 since some versions of gas, such as 2.2 did not accept it. */ 112 113#define ESCAPES \ 114"\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\ 115\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\ 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\1\ 118\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\ 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" 122 123/* Some svr4 assemblers have a limit on the number of characters which 124 can appear in the operand of a .string directive. If your assembler 125 has such a limitation, you should define STRING_LIMIT to reflect that 126 limit. Note that at least some svr4 assemblers have a limit on the 127 actual number of bytes in the double-quoted string, and that they 128 count each character in an escape sequence as one byte. Thus, an 129 escape sequence like \377 would count as four bytes. 130 131 If your target assembler doesn't support the .string directive, you 132 should define this to zero. 133*/ 134 135#define STRING_LIMIT ((unsigned) 256) 136 137#define STRING_ASM_OP "\t.string\t" 138 139/* The routine used to output NUL terminated strings. We use a special 140 version of this for most svr4 targets because doing so makes the 141 generated assembly code more compact (and thus faster to assemble) 142 as well as more readable, especially for targets like the i386 143 (where the only alternative is to output character sequences as 144 comma separated lists of numbers). */ 145 146#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \ 147 do \ 148 { \ 149 const unsigned char *_limited_str = \ 150 (const unsigned char *) (STR); \ 151 unsigned ch; \ 152 fprintf ((FILE), "%s\"", STRING_ASM_OP); \ 153 for (; (ch = *_limited_str); _limited_str++) \ 154 { \ 155 int escape = ESCAPES[ch]; \ 156 switch (escape) \ 157 { \ 158 case 0: \ 159 putc (ch, (FILE)); \ 160 break; \ 161 case 1: \ 162 fprintf ((FILE), "\\%03o", ch); \ 163 break; \ 164 default: \ 165 putc ('\\', (FILE)); \ 166 putc (escape, (FILE)); \ 167 break; \ 168 } \ 169 } \ 170 fprintf ((FILE), "\"\n"); \ 171 } \ 172 while (0) 173 174/* The routine used to output sequences of byte values. We use a special 175 version of this for most svr4 targets because doing so makes the 176 generated assembly code more compact (and thus faster to assemble) 177 as well as more readable. Note that if we find subparts of the 178 character sequence which end with NUL (and which are shorter than 179 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */ 180 181#undef ASM_OUTPUT_ASCII 182#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \ 183 do \ 184 { \ 185 const unsigned char *_ascii_bytes = \ 186 (const unsigned char *) (STR); \ 187 const unsigned char *limit = _ascii_bytes + (LENGTH); \ 188 unsigned bytes_in_chunk = 0; \ 189 for (; _ascii_bytes < limit; _ascii_bytes++) \ 190 { \ 191 const unsigned char *p; \ 192 if (bytes_in_chunk >= 64) \ 193 { \ 194 fputc ('\n', (FILE)); \ 195 bytes_in_chunk = 0; \ 196 } \ 197 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \ 198 continue; \ 199 if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT) \ 200 { \ 201 if (bytes_in_chunk > 0) \ 202 { \ 203 fputc ('\n', (FILE)); \ 204 bytes_in_chunk = 0; \ 205 } \ 206 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \ 207 _ascii_bytes = p; \ 208 } \ 209 else \ 210 { \ 211 if (bytes_in_chunk == 0) \ 212 fprintf ((FILE), "\t.byte\t"); \ 213 else \ 214 fputc (',', (FILE)); \ 215 fprintf ((FILE), "0x%02x", *_ascii_bytes); \ 216 bytes_in_chunk += 5; \ 217 } \ 218 } \ 219 if (bytes_in_chunk > 0) \ 220 fprintf ((FILE), "\n"); \ 221 } \ 222 while (0) 223 224/* Emit code to check the stack when allocating more that 4000 225 bytes in one go. */ 226 227#define CHECK_STACK_LIMIT 0x1000 228 229/* the following are OSF linker (not gld) specific... we don't want them */ 230#undef HAS_INIT_SECTION 231#undef LD_INIT_SWITCH 232#undef LD_FINI_SWITCH 233 234/* The following are needed for us to be able to use winnt.c, but are not 235 otherwise meaningful to Interix. (The functions that use these are 236 never called because we don't do DLLs.) */ 237#define TARGET_NOP_FUN_DLLIMPORT 1 238#define drectve_section() /* nothing */ 239 240/* Objective-C has its own packing rules... 241 Objc tries to parallel the code in stor-layout.c at runtime 242 (see libobjc/encoding.c). This (compile-time) packing info isn't 243 available at runtime, so it's hopeless to try. 244 245 And if the user tries to set the flag for objc, give an error 246 so he has some clue. */ 247 248#undef SUBTARGET_OVERRIDE_OPTIONS 249#define SUBTARGET_OVERRIDE_OPTIONS \ 250do { \ 251 if (strcmp (lang_hooks.name, "GNU Objective-C") == 0) \ 252 { \ 253 if ((target_flags & MASK_MS_BITFIELD_LAYOUT) != 0 \ 254 && (target_flags_explicit & MASK_MS_BITFIELD_LAYOUT) != 0) \ 255 { \ 256 error ("ms-bitfields not supported for objc"); \ 257 } \ 258 target_flags &= ~MASK_MS_BITFIELD_LAYOUT; \ 259 } \ 260} while (0) 261 262#define EH_FRAME_IN_DATA_SECTION 263 264#define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rdata,\"r\"" 265 266/* The MS compilers take alignment as a number of bytes, so we do as well */ 267#undef ASM_OUTPUT_ALIGN 268#define ASM_OUTPUT_ALIGN(FILE,LOG) \ 269 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG)) 270 271/* The linker will take care of this, and having them causes problems with 272 ld -r (specifically -rU). */ 273#define CTOR_LISTS_DEFINED_EXTERNALLY 1 274 275#define SET_ASM_OP "\t.set\t" 276/* Output a definition (implements alias) */ 277#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ 278do \ 279{ \ 280 fprintf ((FILE), "%s", SET_ASM_OP); \ 281 assemble_name (FILE, LABEL1); \ 282 fprintf (FILE, ","); \ 283 assemble_name (FILE, LABEL2); \ 284 fprintf (FILE, "\n"); \ 285 } \ 286while (0) 287 288#define HOST_PTR_PRINTF "%p" 289#define HOST_PTR_AS_INT unsigned long 290 291#define PCC_BITFIELD_TYPE_MATTERS 1 292 293/* The following two flags are usually "off" for i386, because some non-gnu 294 tools (for the i386) don't handle them. However, we don't have that 295 problem, so.... */ 296 297/* Forward references to tags are allowed. */ 298#define SDB_ALLOW_FORWARD_REFERENCES 299 300/* Unknown tags are also allowed. */ 301#define SDB_ALLOW_UNKNOWN_REFERENCES 302 303/* The integer half of this list needs to be constant. However, there's 304 a lot of disagreement about what the floating point adjustments should 305 be. We pick one that works with gdb. (The underlying problem is 306 what to do about the segment registers. Since we have access to them 307 from /proc, we'll allow them to be accessed in gdb, even tho the 308 gcc compiler can't generate them. (There's some evidence that 309 MSVC does, but possibly only for certain special "canned" sequences.) */ 310 311#undef DBX_REGISTER_NUMBER 312#define DBX_REGISTER_NUMBER(n) \ 313(TARGET_64BIT ? dbx64_register_map[n] \ 314 : (n) == 0 ? 0 \ 315 : (n) == 1 ? 2 \ 316 : (n) == 2 ? 1 \ 317 : (n) == 3 ? 3 \ 318 : (n) == 4 ? 6 \ 319 : (n) == 5 ? 7 \ 320 : (n) == 6 ? 5 \ 321 : (n) == 7 ? 4 \ 322 : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+8 \ 323 : (-1)) 324 325/* Define this macro if references to a symbol must be treated 326 differently depending on something about the variable or 327 function named by the symbol (such as what section it is in). */ 328 329#undef TARGET_ENCODE_SECTION_INFO 330#define TARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info 331#undef TARGET_STRIP_NAME_ENCODING 332#define TARGET_STRIP_NAME_ENCODING i386_pe_strip_name_encoding_full 333 334#if 0 335/* Turn this back on when the linker is updated to handle grouped 336 .data$ sections correctly. See corresponding note in i386/interix.c. 337 MK. */ 338 339/* Define this macro if in some cases global symbols from one translation 340 unit may not be bound to undefined symbols in another translation unit 341 without user intervention. For instance, under Microsoft Windows 342 symbols must be explicitly imported from shared libraries (DLLs). */ 343#define MULTIPLE_SYMBOL_SPACES 344 345extern void i386_pe_unique_section (tree, int); 346#define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section 347 348#define SUPPORTS_ONE_ONLY 1 349#endif /* 0 */ 350 351/* Switch into a generic section. */ 352#define TARGET_ASM_NAMED_SECTION default_pe_asm_named_section 353 354/* DWARF2 Unwinding doesn't work with exception handling yet. */ 355#define DWARF2_UNWIND_INFO 0 356 357/* Don't assume anything about the header files. */ 358#define NO_IMPLICIT_EXTERN_C 359 360/* MSVC returns structs of up to 8 bytes via registers. */ 361 362#define DEFAULT_PCC_STRUCT_RETURN 0 363 364#undef RETURN_IN_MEMORY 365#define RETURN_IN_MEMORY(TYPE) \ 366 (TYPE_MODE (TYPE) == BLKmode || \ 367 (AGGREGATE_TYPE_P (TYPE) && int_size_in_bytes(TYPE) > 8 )) 368