gcc/config/i386/i386-interix.h

   1 /* Target definitions for GCC for Intel 80386 running Interix
   2    Parts Copyright (C) 1991-2015 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 GCC.
  11
  12 GCC 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 3, or (at your option)
  15 any later version.
  16
  17 GCC 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 GCC; see the file COPYING3.  If not see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 /* Note: Interix doesn't support user-written DLLs (use conventional
  27    shared libs (.so) instead).  Thus a lot of the stuff that might apply
  28    about dllimport/dllexport and the like does not apply here. */
  29
  30 #include <stdio.h>
  31
  32 /* Names to predefine in the preprocessor for this target machine.  */
  33
  34 #define DBX_DEBUGGING_INFO 1
  35 #define SDB_DEBUGGING_INFO 1
  36 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  37
  38 /* Our strategy for finding global constructors is a bit different, although
  39    not a lot.  */
  40 #define DO_GLOBAL_CTORS_BODY                                            \
  41 do {                                                                    \
  42   int i;                                                                \
  43   unsigned long nptrs;                                                  \
  44   func_ptr *p;                                                          \
  45   asm(                                                                  \
  46        "     .section .ctor_head, \"rw\"\n"                             \
  47        "1:\n"                                                           \
  48        "     .text \n"                                                  \
  49        ASM_LOAD_ADDR(1b,%0)                                             \
  50        : "=r" (p) : : "cc");                                            \
  51   for (nptrs = 0; p[nptrs] != 0; nptrs++);                              \
  52   for (i = nptrs-1; i >= 0; i--)                                        \
  53     p[i] ();                                                            \
  54 } while (0)
  55
  56 #define DO_GLOBAL_DTORS_BODY                                            \
  57 do {                                                                    \
  58   func_ptr *p;                                                          \
  59   asm(                                                                  \
  60        "     .section .dtor_head, \"rw\"\n"                             \
  61        "1:\n"                                                           \
  62        "     .text \n"                                                  \
  63        ASM_LOAD_ADDR(1b,%0)                                             \
  64        : "=r" (p) : : "cc");                                            \
  65   while (*p)                                                            \
  66     {                                                                   \
  67       p++;                                                              \
  68       (*(p-1)) ();                                                      \
  69     }                                                                   \
  70 } while (0)
  71
  72 /* We don't use the "usual" push-an-address solution. */
  73 #undef TARGET_ASM_CONSTRUCTOR
  74
  75 #undef  SUBTARGET_SWITCHES
  76 #define SUBTARGET_SWITCHES \
  77 { "ms-bitfields", MASK_MS_BITFIELD_LAYOUT, N_("Use native (MS) bitfield layout") }, \
  78 { "no-ms-bitfields", -MASK_MS_BITFIELD_LAYOUT, N_("Use gcc default bitfield layout") },
  79
  80 #undef LIB_SPEC
  81 #define LIB_SPEC "\
  82  %{!shared:%{!dynamic:-lc -lpsxdll \
  83  }} \
  84  %{!G:%{!dynamic:-lc -lpsxdll \
  85  }} \
  86  %{dynamic:-lc -lpsxdll \
  87  } \
  88  %{v}"
  89
  90 #undef LINK_SPEC
  91 #define LINK_SPEC "%{!shared:-stack 0x4000000,0x10000} \
  92                    %{g} \
  93                    %{dynamic:-Bdynamic} \
  94                    %{static:-Bstatic} \
  95                    %{shared:--shared -Bdynamic} \
  96                    %{G:--shared -Bdynamic} \
  97                    %{symbolic:--shared -Bsymbolic -Bdynamic} \
  98                    %{rpath*:--rpath %*} \
  99                    "
 100
 101 #undef STARTFILE_SPEC
 102 #define STARTFILE_SPEC  \
 103   "%{!shared:%{pg:gcrt0%O%s}%{!pg:%{p:mcrt0%O%s}%{!p:crt0%O%s}}} %{shared:crti%O%s}"
 104
 105 #define TARGET_DECLSPEC 1
 106
 107 /* cpp handles __STDC__ */
 108 #define TARGET_OS_CPP_BUILTINS()                                        \
 109   do                                                                    \
 110     {                                                                   \
 111         builtin_define ("__INTERIX");                                   \
 112         builtin_define ("_M_IX86=300");                                 \
 113         builtin_define ("_X86_=1");                                     \
 114         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
 115         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
 116         builtin_define ("__declspec(x)=__attribute__((x))");            \
 117         builtin_assert ("system=unix");                                 \
 118         builtin_assert ("system=interix");                              \
 119         if (preprocessing_asm_p ())                                     \
 120           builtin_define_std ("LANGUAGE_ASSEMBLY");                     \
 121         else                                                            \
 122           {                                                             \
 123              builtin_define_std ("LANGUAGE_C");                         \
 124              if (c_dialect_cxx ())                                      \
 125                builtin_define_std ("LANGUAGE_C_PLUS_PLUS");             \
 126              if (c_dialect_objc ())                                     \
 127                builtin_define_std ("LANGUAGE_OBJECTIVE_C");             \
 128           }                                                             \
 129     }                                                                   \
 130   while (0)
 131
 132 #undef CPP_SPEC
 133 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
 134
 135 #define SIZE_TYPE "unsigned int"
 136 #define PTRDIFF_TYPE "int"
 137 #define WCHAR_TYPE "short unsigned int"
 138 #define WCHAR_TYPE_SIZE 16
 139
 140 /* Turn off long double being 96 bits.  */
 141 #undef LONG_DOUBLE_TYPE_SIZE
 142 #define LONG_DOUBLE_TYPE_SIZE 64
 143
 144 #define IX86_NO_LIBGCC_TFMODE
 145
 146 #undef TARGET_LIBC_HAS_FUNCTION
 147 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 148
 149 /* The following are needed for us to be able to use winnt.c, but are not
 150    otherwise meaningful to Interix.  (The functions that use these are
 151    never called because we don't do DLLs.) */
 152 #define TARGET_NOP_FUN_DLLIMPORT 1
 153 #define drectve_section()  /* nothing */
 154
 155
 156 #define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rdata,\"r\""
 157
 158 /* Define this macro if references to a symbol must be treated
 159    differently depending on something about the variale or
 160    function named by the symbol (such as what section it is in).  */
 161
 162 #undef TARGET_ENCODE_SECTION_INFO
 163 #define TARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info
 164 #undef  TARGET_STRIP_NAME_ENCODING
 165 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 166
 167 /* Emit code to check the stack when allocating more that 4000
 168    bytes in one go.  */
 169
 170 #define CHECK_STACK_LIMIT 4000
 171
 172 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 173    and returns float values in the 387 and needs stack probes
 174    We also align doubles to 64-bits forMSVC default compatibility
 175    Ditto for bitfields. */
 176 #undef TARGET_SUBTARGET_DEFAULT
 177 #define TARGET_SUBTARGET_DEFAULT \
 178    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE | \
 179     MASK_ALIGN_DOUBLE | MASK_MS_BITFIELD_LAYOUT)
 180
 181 /* The MS compilers take alignment as a number of bytes, so we do as well */
 182 #undef ASM_OUTPUT_ALIGN
 183 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 184   if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
 185
 186
 187 /* Define this macro if in some cases global symbols from one translation
 188    unit may not be bound to undefined symbols in another translation unit
 189    without user intervention.  For instance, under Microsoft Windows
 190    symbols must be explicitly imported from shared libraries (DLLs).  */
 191 /*
 192  * Old gcc(3.3) did not have 1 here
 193  */
 194 #define MULTIPLE_SYMBOL_SPACES  1
 195
 196 extern void i386_pe_unique_section (tree, int);
 197 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 198
 199 /* Switch into a generic section.  */
 200 #define TARGET_ASM_NAMED_SECTION  default_pe_asm_named_section
 201
 202 /* Select attributes for named sections.  */
 203 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 204
 205 /* Write the extra assembler code needed to declare a function
 206    properly.  If we are generating SDB debugging information, this
 207    will happen automatically, so we only need to handle other cases.  */
 208 #undef ASM_DECLARE_FUNCTION_NAME
 209 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 210   do                                                                    \
 211     {                                                                   \
 212       if (write_symbols != SDB_DEBUG)                                   \
 213        i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL));  \
 214       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 215     }                                                                   \
 216   while (0)
 217
 218 /* Add an external function to the list of functions to be declared at
 219    the end of the file.  */
 220 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 221   do                                                                    \
 222     {                                                                   \
 223       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 224         i386_pe_record_external_function (DECL, NAME);                  \
 225     }                                                                   \
 226   while (0)
 227
 228 /* Declare the type properly for any external libcall.  */
 229 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 230   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 231
 232 /* This says out to put a global symbol in the BSS section.  */
 233 #undef ASM_OUTPUT_ALIGNED_BSS
 234 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 235   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 236
 237 /* Don't assume anything about the header files.  */
 238 #define NO_IMPLICIT_EXTERN_C
 239
 240 /* External function declarations.  */
 241 extern void i386_pe_record_external_function (tree, const char *);
 242 extern void i386_pe_declare_function_type (FILE *, const char *, int);
 243 extern void i386_pe_record_exported_symbol (const char *, int);
 244 extern void i386_pe_asm_file_end (FILE *);
 245
 246 /* For Win32 ABI compatibility */
 247 #undef DEFAULT_PCC_STRUCT_RETURN
 248 #define DEFAULT_PCC_STRUCT_RETURN 0
 249
 250 /* A bitfield declared as `int' forces `int' alignment for the struct.  */
 251 #undef PCC_BITFIELD_TYPE_MATTERS
 252 #define PCC_BITFIELD_TYPE_MATTERS 1
 253
 254 /* Enable alias attribute support.  */
 255 #ifndef SET_ASM_OP
 256 #define SET_ASM_OP "\t.set\t"
 257 #endif
 258
 259 /* Note that there appears to be two different ways to support const
 260    sections at the moment.  You can either #define the symbol
 261    READONLY_DATA_SECTION (giving it some code which switches to the
 262    readonly data section) or else you can #define the symbols
 263    EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
 264    SELECT_RTX_SECTION.  We do both here just to be on the safe side.  */
 265
 266 #define USE_CONST_SECTION 1
 267
 268 /* The linker will take care of this, and having them causes problems with
 269    ld -r (specifically -rU).  */
 270 #define CTOR_LISTS_DEFINED_EXTERNALLY 1
 271
 272 /* Output a definition (implements alias) */
 273 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 274 do                                                                      \
 275 {                                                                       \
 276     fputs (SET_ASM_OP, (FILE));                                         \
 277     assemble_name (FILE, LABEL1);                                       \
 278     fputc (',', (FILE));                                                \
 279     assemble_name (FILE, LABEL2);                                       \
 280     fputc ('\n', (FILE));                                               \
 281     }                                                                   \
 282 while (0)
 283
 284 #define HOST_PTR_AS_INT unsigned long
 285
 286 /* The following two flags are usually "off" for i386, because some non-gnu
 287    tools (for the i386) don't handle them.  However, we don't have that
 288    problem, so....  */
 289
 290 /* Forward references to tags are allowed.  */
 291 #define SDB_ALLOW_FORWARD_REFERENCES
 292 /* Unknown tags are also allowed.  */
 293 #define SDB_ALLOW_UNKNOWN_REFERENCES
 294 /* DWARF2 Unwinding doesn't work with exception handling yet.  */
 295 #define DWARF2_UNWIND_INFO 0
 296 /* MSVC returns structs of up to 8 bytes via registers. */
 297
 298 #undef SUBTARGET_RETURN_IN_MEMORY
 299 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
 300   (TYPE_MODE (TYPE) == BLKmode || \
 301      (AGGREGATE_TYPE_P (TYPE) && int_size_in_bytes(TYPE) > 8 ))
 302
 303 #define ASM_LOAD_ADDR(loc, reg)   "     leal " #loc "," #reg "\n"
 304
 305 /* The integer half of this list needs to be constant.  However, there's
 306    a lot of disagreement about what the floating point adjustments should
 307    be.  We pick one that works with gdb.  (The underlying problem is
 308    what to do about the segment registers.  Since we have access to them
 309    from /proc, we'll allow them to be accessed in gdb, even tho the
 310    gcc compiler can't generate them.  (There's some evidence that
 311    MSVC does, but possibly only for certain special "canned" sequences.)  */
 312
 313 #undef DBX_REGISTER_NUMBER
 314 #define DBX_REGISTER_NUMBER(n) \
 315 (TARGET_64BIT ? dbx64_register_map[n] \
 316  : (n) == 0 ? (int) 0 \
 317  : (n) == 1 ? (int) 2 \
 318  : (n) == 2 ? (int) 1 \
 319  : (n) == 3 ? (int) 3 \
 320  : (n) == 4 ? (int) 6 \
 321  : (n) == 5 ? (int) 7 \
 322  : (n) == 6 ? (int) 5 \
 323  : (n) == 7 ? (int) 4 \
 324  : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (int) (n)+8 \
 325  : (int) (-1))
 326
 327 #define EH_FRAME_THROUGH_COLLECT2
 328 #define EH_TABLES_CAN_BE_READ_ONLY 0
 329
 330 /* the following are OSF linker (not gld) specific... we don't want them */
 331 #undef HAS_INIT_SECTION
 332 #undef LD_INIT_SWITCH
 333 #undef LD_FINI_SWITCH
 334
 335 /* The following are needed for us to be able to use winnt.c, but are not
 336    otherwise meaningful to Interix.  (The functions that use these are
 337    never called because we don't do DLLs.) */
 338 #define TARGET_NOP_FUN_DLLIMPORT 1
 339 #define I386_PE_STRIP_ENCODING(SYM_NAME) \
 340   ((SYM_NAME) + ((SYM_NAME)[0] == '@' \
 341                  ? ((SYM_NAME)[3] == '*' ? 4 : 3) : 0) \
 342              + ((SYM_NAME)[0] == '*' ? 1 : 0))
 343
 344 #define drectve_section()  /* nothing */
 345