gcc/config/netbsd-aout.h

   1 /* Common configuration file for NetBSD a.out targets.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    Contributed by Wasabi Systems, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* TARGET_OS_CPP_BUILTINS() common to all NetBSD a.out targets.  */
  23 #define NETBSD_OS_CPP_BUILTINS_AOUT()           \
  24   do                                            \
  25     {                                           \
  26       NETBSD_OS_CPP_BUILTINS_COMMON();          \
  27     }                                           \
  28   while (0)
  29
  30 /* This defines which switch letters take arguments. */
  31
  32 #undef SWITCH_TAKES_ARG
  33 #define SWITCH_TAKES_ARG(CHAR)          \
  34   (DEFAULT_SWITCH_TAKES_ARG(CHAR)       \
  35    || (CHAR) == 'R')
  36
  37
  38 /* Provide an ASM_SPEC appropriate for NetBSD.  Currently we only deal
  39    with the options for generating PIC code.  */
  40
  41 #undef ASM_SPEC
  42 #define ASM_SPEC " %| %{fpic:-k} %{fPIC:-k -K}"
  43
  44
  45 /* Provide a STARTFILE_SPEC appropriate for NetBSD a.out.  Here we
  46    provide support for the special GCC option -static.  */
  47
  48 #undef STARTFILE_SPEC
  49 #define STARTFILE_SPEC                  \
  50   "%{!shared:                           \
  51      %{pg:gcrt0%O%s}                    \
  52      %{!pg:                             \
  53        %{p:mcrt0%O%s}                   \
  54        %{!p:                            \
  55          %{!static:crt0%O%s}            \
  56          %{static:scrt0%O%s}}}}"
  57
  58 /* Provide a LINK_SPEC appropriate for NetBSD a.out.  Here we provide
  59    support for the special GCC options -static, -assert, and -nostdlib.  */
  60
  61 #undef LINK_SPEC
  62 #define LINK_SPEC                       \
  63   "%{nostdlib:-nostdlib}                \
  64    %{!shared:                           \
  65      %{!nostdlib:                       \
  66        %{!r*:                           \
  67          %{!e*:-e start}}}              \
  68      -dc -dp                            \
  69      %{static:-Bstatic}}                \
  70    %{shared:-Bshareable}                \
  71    %{R*}                                \
  72    %{assert*}"
  73
  74
  75 /* Some imports from svr4.h in support of shared libraries.  */
  76
  77 /* Define the strings used for the .type, .size, and .set directives.
  78    These strings generally do not vary from one system running NetBSD
  79    to another, but if a given system needs to use different pseudo-op
  80    names for these, they may be overridden in the file included after
  81    this one.  */
  82
  83 #undef TYPE_ASM_OP
  84 #undef SIZE_ASM_OP
  85 #undef SET_ASM_OP
  86 #define TYPE_ASM_OP     "\t.type\t"
  87 #define SIZE_ASM_OP     "\t.size\t"
  88 #define SET_ASM_OP      "\t.set\t"
  89
  90
  91 /* This is how we tell the assembler that a symbol is weak.  */
  92
  93 #undef ASM_WEAKEN_LABEL
  94 #define ASM_WEAKEN_LABEL(FILE,NAME)                                     \
  95   do                                                                    \
  96     {                                                                   \
  97       fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME);           \
  98       fputc ('\n', FILE);                                               \
  99       fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);            \
 100       fputc ('\n', FILE);                                               \
 101     }                                                                   \
 102   while (0)
 103
 104
 105 /* The following macro defines the format used to output the second
 106    operand of the .type assembler directive.  Different svr4 assemblers
 107    expect various different forms of this operand.  The one given here
 108    is just a default.  You may need to override it in your machine-
 109    specific tm.h file (depending on the particulars of your assembler).  */
 110
 111 #undef TYPE_OPERAND_FMT
 112 #define TYPE_OPERAND_FMT        "@%s"
 113
 114
 115 /* Write the extra assembler code needed to declare a function's result.
 116    Most svr4 assemblers don't require any special declaration of the
 117    result value, but there are exceptions.  */
 118
 119 #ifndef ASM_DECLARE_RESULT
 120 #define ASM_DECLARE_RESULT(FILE, RESULT)
 121 #endif
 122
 123
 124 /* These macros generate the special .type and .size directives which
 125    are used to set the corresponding fields of the linker symbol table
 126    entries in an ELF object file under SVR4 (and a.out on NetBSD).
 127    These macros also output the starting labels for the relevant
 128    functions/objects.  */
 129
 130 /* Write the extra assembler code needed to declare a function properly.
 131    Some svr4 assemblers need to also have something extra said about the
 132    function's return value.  We allow for that here.  */
 133
 134 #undef ASM_DECLARE_FUNCTION_NAME
 135 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 136   do                                                                    \
 137     {                                                                   \
 138       fprintf (FILE, "%s", TYPE_ASM_OP);                                \
 139       assemble_name (FILE, NAME);                                       \
 140       putc (',', FILE);                                                 \
 141       fprintf (FILE, TYPE_OPERAND_FMT, "function");                     \
 142       putc ('\n', FILE);                                                \
 143       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                    \
 144       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 145     }                                                                   \
 146   while (0)
 147
 148
 149 /* Write the extra assembler code needed to declare an object properly.  */
 150
 151 #undef ASM_DECLARE_OBJECT_NAME
 152 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 153   do                                                                    \
 154     {                                                                   \
 155       fprintf (FILE, "%s", TYPE_ASM_OP);                                \
 156       assemble_name (FILE, NAME);                                       \
 157       putc (',', FILE);                                                 \
 158       fprintf (FILE, TYPE_OPERAND_FMT, "object");                       \
 159       putc ('\n', FILE);                                                \
 160       size_directive_output = 0;                                        \
 161       if (!flag_inhibit_size_directive && DECL_SIZE (DECL))             \
 162         {                                                               \
 163           size_directive_output = 1;                                    \
 164           fprintf (FILE, "%s", SIZE_ASM_OP);                            \
 165           assemble_name (FILE, NAME);                                   \
 166           fprintf (FILE, ",%d\n",                                       \
 167                    int_size_in_bytes (TREE_TYPE (DECL)));               \
 168         }                                                               \
 169       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 170     }                                                                   \
 171   while (0)
 172
 173
 174 /* Output the size directive for a decl in rest_of_decl_compilation
 175    in the case where we did not do so before the initializer.
 176    Once we find the error_mark_node, we know that the value of
 177    size_directive_output was set
 178    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 179
 180 #undef ASM_FINISH_DECLARE_OBJECT
 181 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 182   do                                                                    \
 183     {                                                                   \
 184       const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);           \
 185       if (!flag_inhibit_size_directive && DECL_SIZE (DECL)              \
 186           && ! AT_END && TOP_LEVEL                                      \
 187           && DECL_INITIAL (DECL) == error_mark_node                     \
 188           && !size_directive_output)                                    \
 189         {                                                               \
 190           size_directive_output = 1;                                    \
 191           fprintf (FILE, "%s", SIZE_ASM_OP);                            \
 192           assemble_name (FILE, name);                                   \
 193           fprintf (FILE, ",%d\n",                                       \
 194                    int_size_in_bytes (TREE_TYPE (DECL)));               \
 195         }                                                               \
 196     }                                                                   \
 197   while (0)
 198
 199
 200 /* This is how to declare the size of a function.  */
 201
 202 #undef ASM_DECLARE_FUNCTION_SIZE
 203 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 204   do                                                                    \
 205     {                                                                   \
 206       if (!flag_inhibit_size_directive)                                 \
 207         {                                                               \
 208           char label[256];                                              \
 209           static int labelno;                                           \
 210           labelno++;                                                    \
 211           ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);          \
 212           ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);             \
 213           fprintf (FILE, "%s", SIZE_ASM_OP);                            \
 214           assemble_name (FILE, (FNAME));                                \
 215           fprintf (FILE, ",");                                          \
 216           assemble_name (FILE, label);                                  \
 217           fprintf (FILE, "-");                                          \
 218           assemble_name (FILE, (FNAME));                                \
 219           putc ('\n', FILE);                                            \
 220         }                                                               \
 221     }                                                                   \
 222   while (0)