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