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       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");               \
 139       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                    \
 140       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 141     }                                                                   \
 142   while (0)
 143
 144
 145 /* Write the extra assembler code needed to declare an object properly.  */
 146
 147 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 148   do                                                            \
 149     {                                                           \
 150       HOST_WIDE_INT size;                                       \
 151                                                                 \
 152       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");         \
 153                                                                 \
 154       size_directive_output = 0;                                \
 155       if (!flag_inhibit_size_directive                          \
 156           && (DECL) && DECL_SIZE (DECL))                        \
 157         {                                                       \
 158           size_directive_output = 1;                            \
 159           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 160           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
 161         }                                                       \
 162                                                                 \
 163       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 164     }                                                           \
 165   while (0)
 166
 167 /* Output the size directive for a decl in rest_of_decl_compilation
 168    in the case where we did not do so before the initializer.
 169    Once we find the error_mark_node, we know that the value of
 170    size_directive_output was set
 171    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 172
 173 #undef ASM_FINISH_DECLARE_OBJECT
 174 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 175   do                                                                    \
 176     {                                                                   \
 177       const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);           \
 178       HOST_WIDE_INT size;                                               \
 179       if (!flag_inhibit_size_directive && DECL_SIZE (DECL)              \
 180           && ! AT_END && TOP_LEVEL                                      \
 181           && DECL_INITIAL (DECL) == error_mark_node                     \
 182           && !size_directive_output)                                    \
 183         {                                                               \
 184           size_directive_output = 1;                                    \
 185           size = int_size_in_bytes (TREE_TYPE (DECL));                  \
 186           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                 \
 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         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                         \
 200     }                                                                   \
 201   while (0)