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
   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 #define TARGET_VERSION fprintf (stderr, " (i386 bare ELF target)");
  28
  29 /* The ELF ABI for the i386 says that records and unions are returned
  30    in memory.  */
  31
  32 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
  33         (TYPE_MODE (TYPE) == BLKmode \
  34          || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  35
  36 #undef CPP_SPEC
  37 #define CPP_SPEC ""
  38
  39 #define ENDFILE_SPEC "crtend.o%s"
  40
  41 #define STARTFILE_SPEC "%{!shared: \
  42                          %{!symbolic: \
  43                           %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
  44                         crtbegin.o%s"
  45
  46 #undef DBX_REGISTER_NUMBER
  47 #define DBX_REGISTER_NUMBER(n) \
  48   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  49
  50 /* The routine used to output sequences of byte values.  We use a special
  51    version of this for most svr4 targets because doing so makes the
  52    generated assembly code more compact (and thus faster to assemble)
  53    as well as more readable.  Note that if we find subparts of the
  54    character sequence which end with NUL (and which are shorter than
  55    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  56
  57 #undef ASM_OUTPUT_ASCII
  58 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  59   do                                                                    \
  60     {                                                                   \
  61       const unsigned char *_ascii_bytes =                               \
  62         (const unsigned char *) (STR);                                  \
  63       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
  64       unsigned bytes_in_chunk = 0;                                      \
  65       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  66         {                                                               \
  67           const unsigned char *p;                                       \
  68           if (bytes_in_chunk >= 64)                                     \
  69             {                                                           \
  70               fputc ('\n', (FILE));                                     \
  71               bytes_in_chunk = 0;                                       \
  72             }                                                           \
  73           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  74             continue;                                                   \
  75           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  76             {                                                           \
  77               if (bytes_in_chunk > 0)                                   \
  78                 {                                                       \
  79                   fputc ('\n', (FILE));                                 \
  80                   bytes_in_chunk = 0;                                   \
  81                 }                                                       \
  82               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  83               _ascii_bytes = p;                                         \
  84             }                                                           \
  85           else                                                          \
  86             {                                                           \
  87               if (bytes_in_chunk == 0)                                  \
  88                 fprintf ((FILE), "\t.byte\t");                          \
  89               else                                                      \
  90                 fputc (',', (FILE));                                    \
  91               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
  92               bytes_in_chunk += 5;                                      \
  93             }                                                           \
  94         }                                                               \
  95       if (bytes_in_chunk > 0)                                           \
  96         fprintf ((FILE), "\n");                                         \
  97     }                                                                   \
  98   while (0)
  99
 100 #define LOCAL_LABEL_PREFIX      "."
 101
 102 /* Switch into a generic section.  */
 103 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 104
 105 /* If defined, a C expression whose value is a string containing the
 106    assembler operation to identify the following data as
 107    uninitialized global data.  If not defined, and neither
 108    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 109    uninitialized global data will be output in the data section if
 110    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 111    used.  */
 112 #undef BSS_SECTION_ASM_OP
 113 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 114
 115 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 116    separate, explicit argument.  If you define this macro, it is used
 117    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 118    handling the required alignment of the variable.  The alignment is
 119    specified as the number of bits.
 120
 121    Try to use function `asm_output_aligned_bss' defined in file
 122    `varasm.c' when defining this macro.  */
 123 #undef ASM_OUTPUT_ALIGNED_BSS
 124 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 125   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)