gcc/config/i386/i386elf.h

   1 /* Target definitions for GCC for Intel 80386 using ELF
   2    Copyright (C) 1988, 1991, 1995, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    Derived from sysv4.h written by Ron Guilmette (rfg@netcom.com).
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24 /* Use stabs instead of DWARF debug format.  */
  25 #undef  PREFERRED_DEBUGGING_TYPE
  26 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  27
  28 #define TARGET_VERSION fprintf (stderr, " (i386 bare ELF target)");
  29
  30 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  31    and returns float values in the 387.  */
  32
  33 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
  34
  35 /* The ELF ABI for the i386 says that records and unions are returned
  36    in memory.  */
  37
  38 #undef RETURN_IN_MEMORY
  39 #define RETURN_IN_MEMORY(TYPE) \
  40   (TYPE_MODE (TYPE) == BLKmode \
  41    || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  42
  43 #undef CPP_SPEC
  44 #define CPP_SPEC ""
  45
  46 #define ENDFILE_SPEC "crtend.o%s"
  47
  48 #define STARTFILE_SPEC "%{!shared: \
  49                          %{!symbolic: \
  50                           %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
  51                         crtbegin.o%s"
  52
  53 #undef DBX_REGISTER_NUMBER
  54 #define DBX_REGISTER_NUMBER(n) \
  55   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  56
  57 /* The routine used to output sequences of byte values.  We use a special
  58    version of this for most svr4 targets because doing so makes the
  59    generated assembly code more compact (and thus faster to assemble)
  60    as well as more readable.  Note that if we find subparts of the
  61    character sequence which end with NUL (and which are shorter than
  62    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  63
  64 #undef ASM_OUTPUT_ASCII
  65 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  66   do                                                                    \
  67     {                                                                   \
  68       const unsigned char *_ascii_bytes =                               \
  69         (const unsigned char *) (STR);                                  \
  70       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
  71       unsigned bytes_in_chunk = 0;                                      \
  72       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  73         {                                                               \
  74           const unsigned char *p;                                       \
  75           if (bytes_in_chunk >= 64)                                     \
  76             {                                                           \
  77               fputc ('\n', (FILE));                                     \
  78               bytes_in_chunk = 0;                                       \
  79             }                                                           \
  80           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  81             continue;                                                   \
  82           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  83             {                                                           \
  84               if (bytes_in_chunk > 0)                                   \
  85                 {                                                       \
  86                   fputc ('\n', (FILE));                                 \
  87                   bytes_in_chunk = 0;                                   \
  88                 }                                                       \
  89               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  90               _ascii_bytes = p;                                         \
  91             }                                                           \
  92           else                                                          \
  93             {                                                           \
  94               if (bytes_in_chunk == 0)                                  \
  95                 fprintf ((FILE), "\t.byte\t");                          \
  96               else                                                      \
  97                 fputc (',', (FILE));                                    \
  98               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
  99               bytes_in_chunk += 5;                                      \
 100             }                                                           \
 101         }                                                               \
 102       if (bytes_in_chunk > 0)                                           \
 103         fprintf ((FILE), "\n");                                         \
 104     }                                                                   \
 105   while (0)
 106
 107 #define LOCAL_LABEL_PREFIX      "."
 108
 109 /* Switch into a generic section.  */
 110 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 111
 112 /* If defined, a C expression whose value is a string containing the
 113    assembler operation to identify the following data as
 114    uninitialized global data.  If not defined, and neither
 115    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 116    uninitialized global data will be output in the data section if
 117    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 118    used.  */
 119 #undef BSS_SECTION_ASM_OP
 120 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 121
 122 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 123    separate, explicit argument.  If you define this macro, it is used
 124    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 125    handling the required alignment of the variable.  The alignment is
 126    specified as the number of bits.
 127
 128    Try to use function `asm_output_aligned_bss' defined in file
 129    `varasm.c' when defining this macro.  */
 130 #undef ASM_OUTPUT_ALIGNED_BSS
 131 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 132   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)