gcc/config/i386/i386elf.h

   1 /* Target definitions for GCC for Intel 80386 using ELF
   2    Copyright (C) 1988, 1991, 1995, 2000, 2001, 2002, 2007, 2008, 2010, 2011
   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 3, 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 COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 /* Use stabs instead of DWARF debug format.  */
  24 #undef  PREFERRED_DEBUGGING_TYPE
  25 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  26
  27 /* The ELF ABI for the i386 says that records and unions are returned
  28    in memory.  */
  29
  30 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
  31         (TYPE_MODE (TYPE) == BLKmode \
  32          || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  33
  34 #undef CPP_SPEC
  35 #define CPP_SPEC ""
  36
  37 #define ENDFILE_SPEC "crtend.o%s"
  38
  39 #define STARTFILE_SPEC "%{!shared: \
  40                          %{!symbolic: \
  41                           %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
  42                         crtbegin.o%s"
  43
  44 #undef DBX_REGISTER_NUMBER
  45 #define DBX_REGISTER_NUMBER(n) \
  46   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  47
  48 /* The routine used to output sequences of byte values.  We use a special
  49    version of this for most svr4 targets because doing so makes the
  50    generated assembly code more compact (and thus faster to assemble)
  51    as well as more readable.  Note that if we find subparts of the
  52    character sequence which end with NUL (and which are shorter than
  53    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  54
  55 #undef ASM_OUTPUT_ASCII
  56 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  57   do                                                                    \
  58     {                                                                   \
  59       const unsigned char *_ascii_bytes =                               \
  60         (const unsigned char *) (STR);                                  \
  61       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
  62       unsigned bytes_in_chunk = 0;                                      \
  63       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  64         {                                                               \
  65           const unsigned char *p;                                       \
  66           if (bytes_in_chunk >= 64)                                     \
  67             {                                                           \
  68               fputc ('\n', (FILE));                                     \
  69               bytes_in_chunk = 0;                                       \
  70             }                                                           \
  71           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  72             continue;                                                   \
  73           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  74             {                                                           \
  75               if (bytes_in_chunk > 0)                                   \
  76                 {                                                       \
  77                   fputc ('\n', (FILE));                                 \
  78                   bytes_in_chunk = 0;                                   \
  79                 }                                                       \
  80               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  81               _ascii_bytes = p;                                         \
  82             }                                                           \
  83           else                                                          \
  84             {                                                           \
  85               if (bytes_in_chunk == 0)                                  \
  86                 fputs (ASM_BYTE, (FILE));                               \
  87               else                                                      \
  88                 fputc (',', (FILE));                                    \
  89               fprintf ((FILE), "0x%02x", *_ascii_bytes);                        \
  90               bytes_in_chunk += 5;                                      \
  91             }                                                           \
  92         }                                                               \
  93       if (bytes_in_chunk > 0)                                           \
  94         fputc ('\n', (FILE));                                           \
  95     }                                                                   \
  96   while (0)
  97
  98 #define LOCAL_LABEL_PREFIX      "."
  99
 100 /* Switch into a generic section.  */
 101 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 102
 103 #undef BSS_SECTION_ASM_OP
 104 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 105
 106 #undef ASM_OUTPUT_ALIGNED_BSS
 107 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 108   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)