gcc/config/i386/freebsd.h

   1 /* Definitions for Intel 386 running FreeBSD with ELF format
   2    Copyright (C) 1996, 2000, 2002 Free Software Foundation, Inc.
   3    Contributed by Eric Youngdale.
   4    Modified for stabs-in-ELF by H.J. Lu.
   5    Adapted from GNU/Linux version by John Polstra.
   6    Continued development by David O'Brien <obrien@freebsd.org>
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING.  If not, write to
  22 the Free Software Foundation, 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25
  26 #define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)");
  27
  28 /* Override the default comment-starter of "/".  */
  29 #undef  ASM_COMMENT_START
  30 #define ASM_COMMENT_START "#"
  31
  32 #undef  ASM_APP_ON
  33 #define ASM_APP_ON "#APP\n"
  34
  35 #undef  ASM_APP_OFF
  36 #define ASM_APP_OFF "#NO_APP\n"
  37
  38 #undef  DBX_REGISTER_NUMBER
  39 #define DBX_REGISTER_NUMBER(n) \
  40   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  41
  42 #undef  NO_PROFILE_COUNTERS
  43 #define NO_PROFILE_COUNTERS     1
  44
  45 /* Tell final.c that we don't need a label passed to mcount.  */
  46
  47 #undef  MCOUNT_NAME
  48 #define MCOUNT_NAME ".mcount"
  49
  50 /* Make gcc agree with <machine/ansi.h>.  */
  51
  52 #undef  SIZE_TYPE
  53 #define SIZE_TYPE       (TARGET_64BIT ? "long unsigned int" : "unsigned int")
  54
  55 #undef  PTRDIFF_TYPE
  56 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
  57
  58 #undef  WCHAR_TYPE_SIZE
  59 #define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD)
  60
  61 #undef  SUBTARGET_EXTRA_SPECS   /* i386.h bogusly defines it.  */
  62 #define SUBTARGET_EXTRA_SPECS \
  63   { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
  64
  65 /* Provide a STARTFILE_SPEC appropriate for FreeBSD.  Here we add
  66    the magical crtbegin.o file (see crtstuff.c) which provides part
  67         of the support for getting C++ file-scope static object constructed
  68         before entering `main'.  */
  69
  70 #undef  STARTFILE_SPEC
  71 #define STARTFILE_SPEC \
  72   "%{!shared: \
  73      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  74                        %{!p:%{profile:gcrt1.o%s} \
  75                          %{!profile:crt1.o%s}}}} \
  76    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  77
  78 /* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
  79    the magical crtend.o file (see crtstuff.c) which provides part of
  80         the support for getting C++ file-scope static object constructed
  81         before entering `main', followed by a normal "finalizer" file,
  82         `crtn.o'.  */
  83
  84 #undef  ENDFILE_SPEC
  85 #define ENDFILE_SPEC \
  86   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  87
  88 /* Provide a LINK_SPEC appropriate for FreeBSD.  Here we provide support
  89    for the special GCC options -static and -shared, which allow us to
  90    link things in one of these three modes by applying the appropriate
  91    combinations of options at link-time. We like to support here for
  92    as many of the other GNU linker options as possible. But I don't
  93    have the time to search for those flags. I am sure how to add
  94    support for -soname shared_object_name. H.J.
  95
  96    I took out %{v:%{!V:-V}}. It is too much :-(. They can use
  97    -Wl,-V.
  98
  99    When the -shared link option is used a final link is not being
 100    done.  */
 101
 102 #undef  LINK_SPEC
 103 #define LINK_SPEC "\
 104   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 105   %{Wl,*:%*} \
 106   %{v:-V} \
 107   %{assert*} %{R*} %{rpath*} %{defsym*} \
 108   %{shared:-Bshareable %{h*} %{soname*}} \
 109     %{!shared: \
 110       %{!static: \
 111         %{rdynamic:-export-dynamic} \
 112         %{!dynamic-linker:-dynamic-linker %(fbsd_dynamic_linker) }} \
 113     %{static:-Bstatic}} \
 114   %{symbolic:-Bsymbolic}"
 115
 116 /* A C statement to output to the stdio stream FILE an assembler
 117    command to advance the location counter to a multiple of 1<<LOG
 118    bytes if it is within MAX_SKIP bytes.
 119
 120    This is used to align code labels according to Intel recommendations.  */
 121
 122 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 123 #undef  ASM_OUTPUT_MAX_SKIP_ALIGN
 124 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP)                                  \
 125   if ((LOG) != 0) {                                                                                                             \
 126     if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));    \
 127     else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));    \
 128   }
 129 #endif
 130
 131 /* Don't default to pcc-struct-return, we want to retain compatibility with
 132    older gcc versions AND pcc-struct-return is nonreentrant.
 133    (even though the SVR4 ABI for the i386 says that records and unions are
 134    returned in memory).  */
 135
 136 #undef  DEFAULT_PCC_STRUCT_RETURN
 137 #define DEFAULT_PCC_STRUCT_RETURN 0
 138
 139 /* FreeBSD sets the rounding precision of the FPU to 53 bits.  Let the
 140    compiler get the contents of <float.h> and std::numeric_limits correct.  */
 141 #define SUBTARGET_OVERRIDE_OPTIONS                      \
 142   do {                                                  \
 143     if (!TARGET_64BIT) {                                \
 144       REAL_MODE_FORMAT (XFmode)                         \
 145         = &ieee_extended_intel_96_round_53_format;      \
 146       REAL_MODE_FORMAT (TFmode)                         \
 147         = &ieee_extended_intel_96_round_53_format;      \
 148     }                                                   \
 149   } while (0)