gcc/config/i386/freebsd-aout.h

   1 /* Definitions of target machine for GNU compiler for Intel 80386
   2    running FreeBSD.
   3    Copyright (C) 1988, 1992, 1994, 1996, 1997, 1999, 2000, 2002
   4    Free Software Foundation, Inc.
   5    Contributed by Poul-Henning Kamp <phk@login.dkuug.dk>
   6    Continued development by David O'Brien <obrien@NUXI.org>
   7
   8 This file is part of GNU CC.
   9
  10 GNU CC 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 GNU CC 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 GNU CC; 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 /* Don't assume anything about the header files.  */
  26 #define NO_IMPLICIT_EXTERN_C
  27
  28 /* This goes away when the math-emulator is fixed */
  29 #undef TARGET_SUBTARGET_DEFAULT
  30 #define TARGET_SUBTARGET_DEFAULT \
  31   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  32
  33 /* The macro defined in i386.h doesn't work with the old gas of
  34    FreeBSD 2.x.  The definition in sco.h and sol2.h appears to work,
  35    but it turns out that, even though the assembler doesn't complain,
  36    we get incorrect results.  Fortunately, the definition in
  37    defaults.h works.  */
  38 #undef ASM_PREFERRED_EH_DATA_FORMAT
  39
  40 #define TARGET_OS_CPP_BUILTINS()                \
  41   do                                            \
  42     {                                           \
  43         builtin_define_std ("unix");            \
  44         builtin_define ("__FreeBSD__");         \
  45         builtin_assert ("system=unix");         \
  46         builtin_assert ("system=bsd");          \
  47         builtin_assert ("system=FreeBSD");      \
  48     }                                           \
  49   while (0)
  50
  51 /* Like the default, except no -lg.  */
  52 #define LIB_SPEC "%{!shared:%{!pg:-lc}%{pg:-lc_p}}"
  53
  54 #undef SIZE_TYPE
  55 #define SIZE_TYPE "unsigned int"
  56
  57 #undef PTRDIFF_TYPE
  58 #define PTRDIFF_TYPE "int"
  59
  60 #undef WCHAR_TYPE
  61 #define WCHAR_TYPE "int"
  62
  63 #undef WCHAR_TYPE_SIZE
  64 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  65
  66 /* Override the default comment-starter of "/".  */
  67
  68 #undef ASM_COMMENT_START
  69 #define ASM_COMMENT_START "#"
  70
  71 #undef ASM_APP_ON
  72 #define ASM_APP_ON "#APP\n"
  73
  74 #undef ASM_APP_OFF
  75 #define ASM_APP_OFF "#NO_APP\n"
  76
  77 /* FreeBSD using a.out does not support DWARF2 unwinding mechanisms.  */
  78 #define DWARF2_UNWIND_INFO 0
  79 \f
  80 /* Don't default to pcc-struct-return, because in FreeBSD we prefer the
  81    superior nature of the older gcc way.  */
  82 #define DEFAULT_PCC_STRUCT_RETURN 0
  83
  84 /* Ensure we the configuration knows our system correctly so we can link with
  85    libraries compiled with the native cc.  */
  86 #undef NO_DOLLAR_IN_LABEL
  87 \f
  88 /* i386 freebsd still uses old binutils that don't insert nops by default
  89    when the .align directive demands to insert extra space in the text
  90    segment.  */
  91 #undef ASM_OUTPUT_ALIGN
  92 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  93   if ((LOG)!=0) fprintf ((FILE), "\t.align %d,0x90\n", (LOG))
  94 \f
  95 /* Profiling routines, partially copied from i386/osfrose.h.  */
  96
  97 #undef MCOUNT_NAME
  98 #define MCOUNT_NAME "mcount"
  99 #undef PROFILE_COUNT_REGISTER
 100 #define PROFILE_COUNT_REGISTER "eax"
 101
 102 /*
 103  * Some imports from svr4.h in support of shared libraries.
 104  * Currently, we need the DECLARE_OBJECT_SIZE stuff.
 105  */
 106
 107 /* Define the strings used for the special svr4 .type and .size directives.
 108    These strings generally do not vary from one system running svr4 to
 109    another, but if a given system (e.g. m88k running svr) needs to use
 110    different pseudo-op names for these, they may be overridden in the
 111    file which includes this one.  */
 112
 113 #define TYPE_ASM_OP     "\t.type\t"
 114 #define SIZE_ASM_OP     "\t.size\t"
 115
 116 /* The following macro defines the format used to output the second
 117    operand of the .type assembler directive.  Different svr4 assemblers
 118    expect various different forms for this operand.  The one given here
 119    is just a default.  You may need to override it in your machine-
 120    specific tm.h file (depending upon the particulars of your assembler).  */
 121
 122 #define TYPE_OPERAND_FMT        "@%s"
 123
 124 /* Write the extra assembler code needed to declare a function's result.
 125    Most svr4 assemblers don't require any special declaration of the
 126    result value, but there are exceptions.  */
 127
 128 #ifndef ASM_DECLARE_RESULT
 129 #define ASM_DECLARE_RESULT(FILE, RESULT)
 130 #endif
 131
 132 /* These macros generate the special .type and .size directives which
 133    are used to set the corresponding fields of the linker symbol table
 134    entries in an ELF object file under SVR4.  These macros also output
 135    the starting labels for the relevant functions/objects.  */
 136
 137 /* Write the extra assembler code needed to declare a function properly.
 138    Some svr4 assemblers need to also have something extra said about the
 139    function's return value.  We allow for that here.  */
 140
 141 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 142   do                                                            \
 143     {                                                           \
 144       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
 145       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 146       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 147     }                                                           \
 148   while (0)
 149
 150 /* Write the extra assembler code needed to declare an object properly.  */
 151
 152 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 153   do                                                            \
 154     {                                                           \
 155       HOST_WIDE_INT size;                                       \
 156                                                                 \
 157       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");         \
 158                                                                 \
 159       size_directive_output = 0;                                \
 160       if (!flag_inhibit_size_directive                          \
 161           && (DECL) && DECL_SIZE (DECL))                        \
 162         {                                                       \
 163           size_directive_output = 1;                            \
 164           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 165           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
 166         }                                                       \
 167                                                                 \
 168       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 169     }                                                           \
 170   while (0)
 171
 172 /* Output the size directive for a decl in rest_of_decl_compilation
 173    in the case where we did not do so before the initializer.
 174    Once we find the error_mark_node, we know that the value of
 175    size_directive_output was set
 176    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 177
 178 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 179 do {                                                                    \
 180      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);            \
 181      HOST_WIDE_INT size;                                                \
 182      if (!flag_inhibit_size_directive && DECL_SIZE (DECL)               \
 183          && ! AT_END && TOP_LEVEL                                       \
 184          && DECL_INITIAL (DECL) == error_mark_node                      \
 185          && !size_directive_output)                                     \
 186        {                                                                \
 187          size_directive_output = 1;                                     \
 188          size = int_size_in_bytes (TREE_TYPE (DECL));                   \
 189          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                  \
 190        }                                                                \
 191    } while (0)
 192
 193 /* This is how to declare the size of a function.  */
 194
 195 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 196   do {                                                                  \
 197     if (!flag_inhibit_size_directive)                                   \
 198       ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                           \
 199   } while (0)
 200
 201 #define ASM_SPEC   " %| %{fpic:-k} %{fPIC:-k}"
 202 #define LINK_SPEC \
 203   "%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
 204    %{shared:-Bshareable} \
 205    %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \
 206    %{pg:-Bstatic} %{Z}} \
 207    %{assert*} %{R*}"
 208
 209 #define STARTFILE_SPEC  \
 210   "%{shared:c++rt0.o%s} \
 211    %{!shared:%{pg:gcrt0.o%s}%{!pg:%{static:scrt0.o%s}%{!static:crt0.o%s}}}"
 212
 213 /* Define this so we can compile MS code for use with WINE.  */
 214 #define HANDLE_PRAGMA_PACK_PUSH_POP
 215
 216 /* FreeBSD 2.2.7's assembler does not support .quad properly.  Do not
 217    use it.  */
 218 #undef ASM_QUAD