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, 2003
   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 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 /* 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 /* Tell final.c that we don't need a label passed to mcount.  */
  98 #define NO_PROFILE_COUNTERS 1
  99
 100 #undef MCOUNT_NAME
 101 #define MCOUNT_NAME "mcount"
 102 #undef PROFILE_COUNT_REGISTER
 103 #define PROFILE_COUNT_REGISTER "eax"
 104
 105 /*
 106  * Some imports from svr4.h in support of shared libraries.
 107  * Currently, we need the DECLARE_OBJECT_SIZE stuff.
 108  */
 109
 110 /* Define the strings used for the special svr4 .type and .size directives.
 111    These strings generally do not vary from one system running svr4 to
 112    another, but if a given system (e.g. m88k running svr) needs to use
 113    different pseudo-op names for these, they may be overridden in the
 114    file which includes this one.  */
 115
 116 #define TYPE_ASM_OP     "\t.type\t"
 117 #define SIZE_ASM_OP     "\t.size\t"
 118 #define SET_ASM_OP      "\t.set\t"
 119
 120 /* The following macro defines the format used to output the second
 121    operand of the .type assembler directive.  Different svr4 assemblers
 122    expect various different forms for this operand.  The one given here
 123    is just a default.  You may need to override it in your machine-
 124    specific tm.h file (depending upon the particulars of your assembler).  */
 125
 126 #define TYPE_OPERAND_FMT        "@%s"
 127
 128 #define HANDLE_SYSV_PRAGMA      1
 129
 130 #define ASM_WEAKEN_LABEL(FILE,NAME) \
 131         do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
 132         fputc ('\n', FILE); } while (0)
 133
 134 /* Write the extra assembler code needed to declare a function's result.
 135    Most svr4 assemblers don't require any special declaration of the
 136    result value, but there are exceptions.  */
 137
 138 #ifndef ASM_DECLARE_RESULT
 139 #define ASM_DECLARE_RESULT(FILE, RESULT)
 140 #endif
 141
 142 /* These macros generate the special .type and .size directives which
 143    are used to set the corresponding fields of the linker symbol table
 144    entries in an ELF object file under SVR4.  These macros also output
 145    the starting labels for the relevant functions/objects.  */
 146
 147 /* Write the extra assembler code needed to declare a function properly.
 148    Some svr4 assemblers need to also have something extra said about the
 149    function's return value.  We allow for that here.  */
 150
 151 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 152   do                                                            \
 153     {                                                           \
 154       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
 155       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 156       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 157     }                                                           \
 158   while (0)
 159
 160 /* Write the extra assembler code needed to declare an object properly.  */
 161
 162 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 163   do                                                            \
 164     {                                                           \
 165       HOST_WIDE_INT size;                                       \
 166                                                                 \
 167       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");         \
 168                                                                 \
 169       size_directive_output = 0;                                \
 170       if (!flag_inhibit_size_directive                          \
 171           && (DECL) && DECL_SIZE (DECL))                        \
 172         {                                                       \
 173           size_directive_output = 1;                            \
 174           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 175           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
 176         }                                                       \
 177                                                                 \
 178       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 179     }                                                           \
 180   while (0)
 181
 182 /* Output the size directive for a decl in rest_of_decl_compilation
 183    in the case where we did not do so before the initializer.
 184    Once we find the error_mark_node, we know that the value of
 185    size_directive_output was set
 186    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 187
 188 #undef ASM_FINISH_DECLARE_OBJECT
 189 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 190 do {                                                                    \
 191      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);            \
 192      HOST_WIDE_INT size;                                                \
 193      if (!flag_inhibit_size_directive && DECL_SIZE (DECL)               \
 194          && ! AT_END && TOP_LEVEL                                       \
 195          && DECL_INITIAL (DECL) == error_mark_node                      \
 196          && !size_directive_output)                                     \
 197        {                                                                \
 198          size_directive_output = 1;                                     \
 199          size = int_size_in_bytes (TREE_TYPE (DECL));                   \
 200          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                  \
 201        }                                                                \
 202    } while (0)
 203
 204 /* This is how to declare the size of a function.  */
 205
 206 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 207   do {                                                                  \
 208     if (!flag_inhibit_size_directive)                                   \
 209       ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                           \
 210   } while (0)
 211
 212 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
 213 #define ASM_SPEC   "%{fpic|fpie|fPIC|fPIE:-k}"
 214 #define LINK_SPEC \
 215   "%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
 216    %{shared:-Bshareable} \
 217    %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \
 218    %{pg:-Bstatic} %{Z}} \
 219    %{assert*} %{R*}"
 220
 221 #define STARTFILE_SPEC  \
 222   "%{shared:c++rt0.o%s} \
 223    %{!shared:%{pg:gcrt0.o%s}%{!pg:%{static:scrt0.o%s}%{!static:crt0.o%s}}}"
 224
 225 /* Define this so we can compile MS code for use with WINE.  */
 226 #define HANDLE_PRAGMA_PACK_PUSH_POP
 227
 228 /* FreeBSD 2.2.7's assembler does not support .quad properly.  Do not
 229    use it.  */
 230 #undef ASM_QUAD