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