gcc/config/i386/i386elf.h

   1 /* Target definitions for GNU compiler 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 GNU CC.
   8
   9 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, 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 /* This used to define X86, but james@bigtex.cactus.org says that
  44    is supposed to be defined optionally by user programs--not by default.  */
  45 #define CPP_PREDEFINES ""
  46
  47 #undef CPP_SPEC
  48 #define CPP_SPEC ""
  49
  50 #define ENDFILE_SPEC "crtend.o%s"
  51
  52 #define STARTFILE_SPEC "%{!shared: \
  53                          %{!symbolic: \
  54                           %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
  55                         crtbegin.o%s"
  56
  57 #undef DBX_REGISTER_NUMBER
  58 #define DBX_REGISTER_NUMBER(n) \
  59   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  60
  61 /* The routine used to output sequences of byte values.  We use a special
  62    version of this for most svr4 targets because doing so makes the
  63    generated assembly code more compact (and thus faster to assemble)
  64    as well as more readable.  Note that if we find subparts of the
  65    character sequence which end with NUL (and which are shorter than
  66    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  67
  68 #undef ASM_OUTPUT_ASCII
  69 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  70   do                                                                    \
  71     {                                                                   \
  72       register const unsigned char *_ascii_bytes =                      \
  73         (const unsigned char *) (STR);                                  \
  74       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
  75       register unsigned bytes_in_chunk = 0;                             \
  76       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  77         {                                                               \
  78           register const unsigned char *p;                              \
  79           if (bytes_in_chunk >= 64)                                     \
  80             {                                                           \
  81               fputc ('\n', (FILE));                                     \
  82               bytes_in_chunk = 0;                                       \
  83             }                                                           \
  84           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  85             continue;                                                   \
  86           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  87             {                                                           \
  88               if (bytes_in_chunk > 0)                                   \
  89                 {                                                       \
  90                   fputc ('\n', (FILE));                                 \
  91                   bytes_in_chunk = 0;                                   \
  92                 }                                                       \
  93               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  94               _ascii_bytes = p;                                         \
  95             }                                                           \
  96           else                                                          \
  97             {                                                           \
  98               if (bytes_in_chunk == 0)                                  \
  99                 fprintf ((FILE), "\t.byte\t");                          \
 100               else                                                      \
 101                 fputc (',', (FILE));                                    \
 102               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
 103               bytes_in_chunk += 5;                                      \
 104             }                                                           \
 105         }                                                               \
 106       if (bytes_in_chunk > 0)                                           \
 107         fprintf ((FILE), "\n");                                         \
 108     }                                                                   \
 109   while (0)
 110
 111 #define LOCAL_LABEL_PREFIX      "."
 112
 113 /* Switch into a generic section.  */
 114 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 115
 116 /* If defined, a C expression whose value is a string containing the
 117    assembler operation to identify the following data as
 118    uninitialized global data.  If not defined, and neither
 119    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
 120    uninitialized global data will be output in the data section if
 121    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
 122    used.  */
 123 #undef BSS_SECTION_ASM_OP
 124 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 125
 126 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
 127    separate, explicit argument.  If you define this macro, it is used
 128    in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
 129    handling the required alignment of the variable.  The alignment is
 130    specified as the number of bits.
 131
 132    Try to use function `asm_output_aligned_bss' defined in file
 133    `varasm.c' when defining this macro.  */
 134 #undef ASM_OUTPUT_ALIGNED_BSS
 135 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 136   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)