gnu/usr.bin/cc34/cc_prep/config/i386/dragonfly.h

   1 /* $DragonFly: src/gnu/usr.bin/cc34/cc_prep/config/i386/dragonfly.h,v 1.2 2005/05/11 19:46:50 dillon Exp $ */
   2
   3 /* Definitions for Intel 386 running DragonFly with ELF format
   4
   5    Copyright (C) 1996, 2000, 2002 Free Software Foundation, Inc.
   6    Contributed by Eric Youngdale.
   7    Modified for stabs-in-ELF by H.J. Lu.
   8    Adapted from GNU/Linux version by John Polstra.
   9    Continued development by David O'Brien <obrien@freebsd.org>
  10    Adapted from the FreeBSD version.
  11
  12    Changes:
  13    - remove support for changing the dynamic linker
  14
  15 This file is part of GCC.
  16
  17 GCC is free software; you can redistribute it and/or modify
  18 it under the terms of the GNU General Public License as published by
  19 the Free Software Foundation; either version 2, or (at your option)
  20 any later version.
  21
  22 GCC is distributed in the hope that it will be useful,
  23 but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 GNU General Public License for more details.
  26
  27 You should have received a copy of the GNU General Public License
  28 along with GCC; see the file COPYING.  If not, write to
  29 the Free Software Foundation, 59 Temple Place - Suite 330,
  30 Boston, MA 02111-1307, USA.  */
  31
  32
  33 #define TARGET_VERSION fprintf (stderr, " (i386 DragonFly/ELF)");
  34
  35 /* Override the default comment-starter of "/".  */
  36 #undef  ASM_COMMENT_START
  37 #define ASM_COMMENT_START "#"
  38
  39 #undef  ASM_APP_ON
  40 #define ASM_APP_ON "#APP\n"
  41
  42 #undef  ASM_APP_OFF
  43 #define ASM_APP_OFF "#NO_APP\n"
  44
  45 #undef  DBX_REGISTER_NUMBER
  46 #define DBX_REGISTER_NUMBER(n) \
  47   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  48
  49 #undef  NO_PROFILE_COUNTERS
  50 #define NO_PROFILE_COUNTERS     1
  51
  52 /* Tell final.c that we don't need a label passed to mcount.  */
  53
  54 #undef  MCOUNT_NAME
  55 #define MCOUNT_NAME ".mcount"
  56
  57 /* Make gcc agree with <machine/ansi.h>.  */
  58
  59 #undef  SIZE_TYPE
  60 #define SIZE_TYPE       (TARGET_64BIT ? "long unsigned int" : "unsigned int")
  61
  62 #undef  PTRDIFF_TYPE
  63 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
  64
  65 #undef  WCHAR_TYPE_SIZE
  66 #define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD)
  67
  68 /* Provide a STARTFILE_SPEC appropriate for DragonFly.  Here we add
  69    the magical crtbegin.o file (see crtstuff.c) which provides part
  70         of the support for getting C++ file-scope static object constructed
  71         before entering `main'.  */
  72
  73 #undef  STARTFILE_SPEC
  74 #define STARTFILE_SPEC \
  75   "%{!shared: \
  76      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  77                        %{!p:%{profile:gcrt1.o%s} \
  78                          %{!profile:crt1.o%s}}}} \
  79    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  80
  81 /* Provide a ENDFILE_SPEC appropriate for DragonFly.  Here we tack on
  82    the magical crtend.o file (see crtstuff.c) which provides part of
  83         the support for getting C++ file-scope static object constructed
  84         before entering `main', followed by a normal "finalizer" file,
  85         `crtn.o'.  */
  86
  87 #undef  ENDFILE_SPEC
  88 #define ENDFILE_SPEC \
  89   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  90
  91 /* Provide a LINK_SPEC appropriate for DragonFly.  Here we provide support
  92    for the special GCC options -static and -shared, which allow us to
  93    link things in one of these three modes by applying the appropriate
  94    combinations of options at link-time. We like to support here for
  95    as many of the other GNU linker options as possible. But I don't
  96    have the time to search for those flags. I am sure how to add
  97    support for -soname shared_object_name. H.J.
  98
  99    I took out %{v:%{!V:-V}}. It is too much :-(. They can use
 100    -Wl,-V.
 101
 102    When the -shared link option is used a final link is not being
 103    done.  */
 104
 105 #undef  LINK_SPEC
 106 #define LINK_SPEC "\
 107   %{p:%nconsider using `-pg' instead of `-p' with gprof(1)} \
 108   %{Wl,*:%*} \
 109   %{v:-V} \
 110   %{assert*} %{R*} %{rpath*} %{defsym*} \
 111   %{shared:-Bshareable %{h*} %{soname*}} \
 112     %{!shared: \
 113       %{!static: \
 114         %{rdynamic:-export-dynamic} \
 115         %{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.2}} \
 116     %{static:-Bstatic}} \
 117   %{symbolic:-Bsymbolic}"
 118
 119 /* A C statement to output to the stdio stream FILE an assembler
 120    command to advance the location counter to a multiple of 1<<LOG
 121    bytes if it is within MAX_SKIP bytes.
 122
 123    This is used to align code labels according to Intel recommendations.  */
 124
 125 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 126 #undef  ASM_OUTPUT_MAX_SKIP_ALIGN
 127 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP)                                  \
 128   if ((LOG) != 0) {                                                                                                             \
 129     if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));    \
 130     else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));    \
 131   }
 132 #endif
 133
 134 /* Don't default to pcc-struct-return, we want to retain compatibility with
 135    older gcc versions AND pcc-struct-return is nonreentrant.
 136    (even though the SVR4 ABI for the i386 says that records and unions are
 137    returned in memory).  */
 138
 139 #undef  DEFAULT_PCC_STRUCT_RETURN
 140 #define DEFAULT_PCC_STRUCT_RETURN 0
 141
 142 /* DragonFly sets the rounding precision of the FPU to 53 bits.  Let the
 143    compiler get the contents of <float.h> and std::numeric_limits correct.  */
 144 #define SUBTARGET_OVERRIDE_OPTIONS                      \
 145   do {                                                  \
 146     if (!TARGET_64BIT) {                                \
 147       REAL_MODE_FORMAT (XFmode)                         \
 148         = &ieee_extended_intel_96_round_53_format;      \
 149       REAL_MODE_FORMAT (TFmode)                         \
 150         = &ieee_extended_intel_96_round_53_format;      \
 151     }                                                   \
 152   } while (0)