gcc/config/i386/freebsd.h

   1 /* Definitions of target machine for GNU compiler for Intel 80386
   2    running FreeBSD.
   3    Copyright (C) 1988, 1992, 1994, 1996, 1997, 1999 Free Software
   4    Foundation, Inc.
   5    Contributed by Poul-Henning Kamp <phk@login.dkuug.dk>
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24 /* This is tested by i386gas.h.  */
  25 #define YES_UNDERSCORES
  26
  27 /* Don't assume anything about the header files. */
  28 #define NO_IMPLICIT_EXTERN_C
  29
  30 #include "i386/gstabs.h"
  31
  32 /* This goes away when the math-emulator is fixed */
  33 #undef TARGET_DEFAULT
  34 #define TARGET_DEFAULT \
  35   (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387)
  36
  37 #undef CPP_PREDEFINES
  38 #define CPP_PREDEFINES "-Dunix -D__FreeBSD__\
  39  -Asystem(unix) -Asystem(bsd) -Asystem(FreeBSD)"
  40
  41 /* Like the default, except no -lg.  */
  42 #define LIB_SPEC "%{!shared:%{!pg:-lc}%{pg:-lc_p}}"
  43
  44 #undef SIZE_TYPE
  45 #define SIZE_TYPE "unsigned int"
  46
  47 #undef PTRDIFF_TYPE
  48 #define PTRDIFF_TYPE "int"
  49
  50 #undef WCHAR_TYPE
  51 #define WCHAR_TYPE "int"
  52
  53 #define WCHAR_UNSIGNED 0
  54
  55 #undef WCHAR_TYPE_SIZE
  56 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  57
  58 /* Override the default comment-starter of "/".  */
  59
  60 #undef ASM_COMMENT_START
  61 #define ASM_COMMENT_START "#"
  62
  63 #undef ASM_APP_ON
  64 #define ASM_APP_ON "#APP\n"
  65
  66 #undef ASM_APP_OFF
  67 #define ASM_APP_OFF "#NO_APP\n"
  68
  69 /* FreeBSD using a.out does not support DWARF2 unwinding mechanisms.  */
  70 #define DWARF2_UNWIND_INFO 0
  71 \f
  72 /* The following macros are stolen from i386v4.h */
  73 /* These have to be defined to get PIC code correct */
  74
  75 /* This is how to output an element of a case-vector that is relative.
  76    This is only used for PIC code.  See comments by the `casesi' insn in
  77    i386.md for an explanation of the expression this outputs. */
  78
  79 #undef ASM_OUTPUT_ADDR_DIFF_ELT
  80 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
  81   fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
  82
  83 /* Indicate that jump tables go in the text section.  This is
  84    necessary when compiling PIC code.  */
  85
  86 #define JUMP_TABLES_IN_TEXT_SECTION 1
  87
  88 /* Don't default to pcc-struct-return, because in FreeBSD we prefer the
  89    superior nature of the older gcc way.  */
  90 #define DEFAULT_PCC_STRUCT_RETURN 0
  91
  92 /* Ensure we the configuration knows our system correctly so we can link with
  93    libraries compiled with the native cc. */
  94 #undef NO_DOLLAR_IN_LABEL
  95 \f
  96 /* i386 freebsd still uses old binutils that don't insert nops by default
  97    when the .align directive demands to insert extra space in the text
  98    segment.  */
  99 #undef ASM_OUTPUT_ALIGN
 100 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 101   if ((LOG)!=0) fprintf ((FILE), "\t.align %d,0x90\n", (LOG))
 102 \f
 103 /* Profiling routines, partially copied from i386/osfrose.h.  */
 104
 105 /* Redefine this to use %eax instead of %edx.  */
 106 #undef FUNCTION_PROFILER
 107 #define FUNCTION_PROFILER(FILE, LABELNO)  \
 108 {                                                                       \
 109   if (flag_pic)                                                         \
 110     {                                                                   \
 111       fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%eax\n",              \
 112                LPREFIX, (LABELNO));                                     \
 113       fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n");                    \
 114     }                                                                   \
 115   else                                                                  \
 116     {                                                                   \
 117       fprintf (FILE, "\tmovl $%sP%d,%%eax\n", LPREFIX, (LABELNO));      \
 118       fprintf (FILE, "\tcall mcount\n");                                \
 119     }                                                                   \
 120 }
 121
 122 /*
 123  * Some imports from svr4.h in support of shared libraries.
 124  * Currently, we need the DECLARE_OBJECT_SIZE stuff.
 125  */
 126
 127 /* Define the strings used for the special svr4 .type and .size directives.
 128    These strings generally do not vary from one system running svr4 to
 129    another, but if a given system (e.g. m88k running svr) needs to use
 130    different pseudo-op names for these, they may be overridden in the
 131    file which includes this one.  */
 132
 133 #define TYPE_ASM_OP     ".type"
 134 #define SIZE_ASM_OP     ".size"
 135
 136 /* The following macro defines the format used to output the second
 137    operand of the .type assembler directive.  Different svr4 assemblers
 138    expect various different forms for this operand.  The one given here
 139    is just a default.  You may need to override it in your machine-
 140    specific tm.h file (depending upon the particulars of your assembler).  */
 141
 142 #define TYPE_OPERAND_FMT        "@%s"
 143
 144 /* Write the extra assembler code needed to declare a function's result.
 145    Most svr4 assemblers don't require any special declaration of the
 146    result value, but there are exceptions.  */
 147
 148 #ifndef ASM_DECLARE_RESULT
 149 #define ASM_DECLARE_RESULT(FILE, RESULT)
 150 #endif
 151
 152 /* These macros generate the special .type and .size directives which
 153    are used to set the corresponding fields of the linker symbol table
 154    entries in an ELF object file under SVR4.  These macros also output
 155    the starting labels for the relevant functions/objects.  */
 156
 157 /* Write the extra assembler code needed to declare a function properly.
 158    Some svr4 assemblers need to also have something extra said about the
 159    function's return value.  We allow for that here.  */
 160
 161 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 162   do {                                                                  \
 163     fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);                             \
 164     assemble_name (FILE, NAME);                                         \
 165     putc (',', FILE);                                                   \
 166     fprintf (FILE, TYPE_OPERAND_FMT, "function");                       \
 167     putc ('\n', FILE);                                                  \
 168     ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                      \
 169     ASM_OUTPUT_LABEL(FILE, NAME);                                       \
 170   } while (0)
 171
 172 /* Write the extra assembler code needed to declare an object properly.  */
 173
 174 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 175   do {                                                                  \
 176     fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);                             \
 177     assemble_name (FILE, NAME);                                         \
 178     putc (',', FILE);                                                   \
 179     fprintf (FILE, TYPE_OPERAND_FMT, "object");                         \
 180     putc ('\n', FILE);                                                  \
 181     size_directive_output = 0;                                          \
 182     if (!flag_inhibit_size_directive && DECL_SIZE (DECL))               \
 183       {                                                                 \
 184         size_directive_output = 1;                                      \
 185         fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);                         \
 186         assemble_name (FILE, NAME);                                     \
 187         fprintf (FILE, ",%d\n",  int_size_in_bytes (TREE_TYPE (DECL))); \
 188       }                                                                 \
 189     ASM_OUTPUT_LABEL(FILE, NAME);                                       \
 190   } while (0)
 191
 192 /* Output the size directive for a decl in rest_of_decl_compilation
 193    in the case where we did not do so before the initializer.
 194    Once we find the error_mark_node, we know that the value of
 195    size_directive_output was set
 196    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 197
 198 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 199 do {                                                                    \
 200      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);            \
 201      if (!flag_inhibit_size_directive && DECL_SIZE (DECL)               \
 202          && ! AT_END && TOP_LEVEL                                       \
 203          && DECL_INITIAL (DECL) == error_mark_node                      \
 204          && !size_directive_output)                                     \
 205        {                                                                \
 206          fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);                        \
 207          assemble_name (FILE, name);                                    \
 208          fprintf (FILE, ",%d\n",  int_size_in_bytes (TREE_TYPE (DECL)));\
 209         }                                                               \
 210    } while (0)
 211
 212
 213 /* This is how to declare the size of a function.  */
 214
 215 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 216   do {                                                                  \
 217     if (!flag_inhibit_size_directive)                                   \
 218       {                                                                 \
 219         char label[256];                                                \
 220         static int labelno;                                             \
 221         labelno++;                                                      \
 222         ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);            \
 223         ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);               \
 224         fprintf (FILE, "\t%s\t ", SIZE_ASM_OP);                         \
 225         assemble_name (FILE, (FNAME));                                  \
 226         fprintf (FILE, ",");                                            \
 227         assemble_name (FILE, label);                                    \
 228         fprintf (FILE, "-");                                            \
 229         assemble_name (FILE, (FNAME));                                  \
 230         putc ('\n', FILE);                                              \
 231       }                                                                 \
 232   } while (0)
 233
 234 #define ASM_SPEC   " %| %{fpic:-k} %{fPIC:-k}"
 235 #define LINK_SPEC \
 236   "%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
 237    %{shared:-Bshareable} \
 238    %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \
 239    %{pg:-Bstatic} %{Z}} \
 240    %{assert*} %{R*}"
 241
 242 #define STARTFILE_SPEC  \
 243   "%{shared:c++rt0.o%s} \
 244    %{!shared:%{pg:gcrt0.o%s}%{!pg:%{static:scrt0.o%s}%{!static:crt0.o%s}}}"
 245
 246 /* Define this so we can compile MS code for use with WINE.  */
 247 #define HANDLE_PRAGMA_PACK_PUSH_POP