gcc/config/i386/freebsd.h

   1 /* Definitions for Intel 386 running FreeBSD with ELF format
   2    Copyright (C) 1996-2014 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 3, 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 COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24
  25 /* Override the default comment-starter of "/".  */
  26 #undef  ASM_COMMENT_START
  27 #define ASM_COMMENT_START "#"
  28
  29 #undef  ASM_APP_ON
  30 #define ASM_APP_ON "#APP\n"
  31
  32 #undef  ASM_APP_OFF
  33 #define ASM_APP_OFF "#NO_APP\n"
  34
  35 #undef  DBX_REGISTER_NUMBER
  36 #define DBX_REGISTER_NUMBER(n) \
  37   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  38
  39 #undef  NO_PROFILE_COUNTERS
  40 #define NO_PROFILE_COUNTERS     1
  41
  42 /* Tell final.c that we don't need a label passed to mcount.  */
  43
  44 #undef  MCOUNT_NAME
  45 #define MCOUNT_NAME ".mcount"
  46
  47 /* Make gcc agree with <machine/ansi.h>.  */
  48
  49 #undef  SIZE_TYPE
  50 #define SIZE_TYPE       (TARGET_64BIT ? "long unsigned int" : "unsigned int")
  51
  52 #undef  PTRDIFF_TYPE
  53 #define PTRDIFF_TYPE    (TARGET_64BIT ? "long int" : "int")
  54
  55 #undef  WCHAR_TYPE_SIZE
  56 #define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD)
  57
  58 #undef  SUBTARGET_EXTRA_SPECS   /* i386.h bogusly defines it.  */
  59 #define SUBTARGET_EXTRA_SPECS \
  60   { "fbsd_dynamic_linker", FBSD_DYNAMIC_LINKER }
  61
  62 /* Provide a STARTFILE_SPEC appropriate for FreeBSD.  Here we add
  63    the magical crtbegin.o file (see crtstuff.c) which provides part
  64         of the support for getting C++ file-scope static object constructed
  65         before entering `main'.  */
  66
  67 #undef  STARTFILE_SPEC
  68 #define STARTFILE_SPEC \
  69   "%{!shared: \
  70      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
  71                        %{!p:%{profile:gcrt1.o%s} \
  72                          %{!profile:crt1.o%s}}}} \
  73    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
  74
  75 /* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
  76    the magical crtend.o file (see crtstuff.c) which provides part of
  77         the support for getting C++ file-scope static object constructed
  78         before entering `main', followed by a normal "finalizer" file,
  79         `crtn.o'.  */
  80
  81 #undef  ENDFILE_SPEC
  82 #define ENDFILE_SPEC \
  83   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
  84
  85 /* Provide a LINK_SPEC appropriate for FreeBSD.  Here we provide support
  86    for the special GCC options -static and -shared, which allow us to
  87    link things in one of these three modes by applying the appropriate
  88    combinations of options at link-time.
  89
  90    When the -shared link option is used a final link is not being
  91    done.  */
  92
  93 #undef  LINK_SPEC
  94 #define LINK_SPEC "\
  95   %{p:%nconsider using '-pg' instead of '-p' with gprof(1)} \
  96   %{v:-V} \
  97   %{assert*} %{R*} %{rpath*} %{defsym*} \
  98   %{shared:-Bshareable %{h*} %{soname*}} \
  99     %{!shared: \
 100       %{!static: \
 101         %{rdynamic:-export-dynamic} \
 102         -dynamic-linker %(fbsd_dynamic_linker) } \
 103     %{static:-Bstatic}} \
 104   %{symbolic:-Bsymbolic}"
 105
 106 /* A C statement to output to the stdio stream FILE an assembler
 107    command to advance the location counter to a multiple of 1<<LOG
 108    bytes if it is within MAX_SKIP bytes.
 109
 110    This is used to align code labels according to Intel recommendations.  */
 111
 112 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
 113 #undef  ASM_OUTPUT_MAX_SKIP_ALIGN
 114 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP)                                  \
 115   if ((LOG) != 0) {                                                                                                             \
 116     if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));    \
 117     else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));    \
 118   }
 119 #endif
 120
 121 /* Don't default to pcc-struct-return, we want to retain compatibility with
 122    older gcc versions AND pcc-struct-return is nonreentrant.
 123    (even though the SVR4 ABI for the i386 says that records and unions are
 124    returned in memory).  */
 125
 126 #undef  DEFAULT_PCC_STRUCT_RETURN
 127 #define DEFAULT_PCC_STRUCT_RETURN 0
 128
 129 /* FreeBSD sets the rounding precision of the FPU to 53 bits.  Let the
 130    compiler get the contents of <float.h> and std::numeric_limits correct.  */
 131 #undef TARGET_96_ROUND_53_LONG_DOUBLE
 132 #define TARGET_96_ROUND_53_LONG_DOUBLE (!TARGET_64BIT)
 133
 134 /* Put all *tf routines in libgcc.  */
 135 #define LIBGCC2_TF_CEXT q
 136
 137 /* Static stack checking is supported by means of probes.  */
 138 #define STACK_CHECK_STATIC_BUILTIN 1
 139
 140 /* Support for i386 has been removed from FreeBSD 6.0 onward.  */
 141 #if FBSD_MAJOR >= 6
 142 #define SUBTARGET32_DEFAULT_CPU "i486"
 143 #endif
 144
 145 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
 146