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 GCC.
   6
   7 GCC 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 GCC 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 GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, 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|fpie:-k} %{fPIC|fPIE:-k -K}"
  43
  44 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  45
  46
  47 /* Provide a STARTFILE_SPEC appropriate for NetBSD a.out.  Here we
  48    provide support for the special GCC option -static.  */
  49
  50 #undef STARTFILE_SPEC
  51 #define STARTFILE_SPEC                  \
  52   "%{!shared:                           \
  53      %{pg:gcrt0%O%s}                    \
  54      %{!pg:                             \
  55        %{p:mcrt0%O%s}                   \
  56        %{!p:                            \
  57          %{!static:crt0%O%s}            \
  58          %{static:scrt0%O%s}}}}"
  59
  60 /* Provide a LINK_SPEC appropriate for NetBSD a.out.  Here we provide
  61    support for the special GCC options -static, -assert, and -nostdlib.  */
  62
  63 #undef NETBSD_LINK_SPEC_AOUT
  64 #define NETBSD_LINK_SPEC_AOUT           \
  65   "%{nostdlib:-nostdlib}                \
  66    %{!shared:                           \
  67      %{!nostdlib:                       \
  68        %{!r*:                           \
  69          %{!e*:-e start}}}              \
  70      -dc -dp                            \
  71      %{static:-Bstatic}}                \
  72    %{shared:-Bshareable}                \
  73    %{R*}                                \
  74    %{assert*}"
  75
  76 /* Default LINK_SPEC.  */
  77 #undef LINK_SPEC
  78 #define LINK_SPEC NETBSD_LINK_SPEC_AOUT
  79
  80 /* Some imports from svr4.h in support of shared libraries.  */
  81
  82 /* Define the strings used for the .type, .size, and .set directives.
  83    These strings generally do not vary from one system running NetBSD
  84    to another, but if a given system needs to use different pseudo-op
  85    names for these, they may be overridden in the file included after
  86    this one.  */
  87
  88 #undef TYPE_ASM_OP
  89 #undef SIZE_ASM_OP
  90 #undef SET_ASM_OP
  91 #define TYPE_ASM_OP     "\t.type\t"
  92 #define SIZE_ASM_OP     "\t.size\t"
  93 #define SET_ASM_OP      "\t.set\t"
  94
  95
  96 /* This is how we tell the assembler that a symbol is weak.  */
  97
  98 #undef ASM_WEAKEN_LABEL
  99 #define ASM_WEAKEN_LABEL(FILE,NAME)                                     \
 100   do                                                                    \
 101     {                                                                   \
 102       fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME);           \
 103       fputc ('\n', FILE);                                               \
 104       fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);            \
 105       fputc ('\n', FILE);                                               \
 106     }                                                                   \
 107   while (0)
 108
 109
 110 /* The following macro defines the format used to output the second
 111    operand of the .type assembler directive.  Different svr4 assemblers
 112    expect various different forms of this operand.  The one given here
 113    is just a default.  You may need to override it in your machine-
 114    specific tm.h file (depending on the particulars of your assembler).  */
 115
 116 #undef TYPE_OPERAND_FMT
 117 #define TYPE_OPERAND_FMT        "@%s"
 118
 119
 120 /* Write the extra assembler code needed to declare a function's result.
 121    Most svr4 assemblers don't require any special declaration of the
 122    result value, but there are exceptions.  */
 123
 124 #ifndef ASM_DECLARE_RESULT
 125 #define ASM_DECLARE_RESULT(FILE, RESULT)
 126 #endif
 127
 128
 129 /* These macros generate the special .type and .size directives which
 130    are used to set the corresponding fields of the linker symbol table
 131    entries in an ELF object file under SVR4 (and a.out on NetBSD).
 132    These macros also output the starting labels for the relevant
 133    functions/objects.  */
 134
 135 /* Write the extra assembler code needed to declare a function properly.
 136    Some svr4 assemblers need to also have something extra said about the
 137    function's return value.  We allow for that here.  */
 138
 139 #undef ASM_DECLARE_FUNCTION_NAME
 140 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 141   do                                                                    \
 142     {                                                                   \
 143       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");               \
 144       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                    \
 145       ASM_OUTPUT_LABEL(FILE, NAME);                                     \
 146     }                                                                   \
 147   while (0)
 148
 149
 150 /* Write the extra assembler code needed to declare an object properly.  */
 151
 152 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 153   do                                                            \
 154     {                                                           \
 155       HOST_WIDE_INT size;                                       \
 156                                                                 \
 157       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");         \
 158                                                                 \
 159       size_directive_output = 0;                                \
 160       if (!flag_inhibit_size_directive                          \
 161           && (DECL) && DECL_SIZE (DECL))                        \
 162         {                                                       \
 163           size_directive_output = 1;                            \
 164           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 165           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
 166         }                                                       \
 167                                                                 \
 168       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 169     }                                                           \
 170   while (0)
 171
 172 /* Output the size directive for a decl in rest_of_decl_compilation
 173    in the case where we did not do so before the initializer.
 174    Once we find the error_mark_node, we know that the value of
 175    size_directive_output was set
 176    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 177
 178 #undef ASM_FINISH_DECLARE_OBJECT
 179 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)        \
 180   do                                                                    \
 181     {                                                                   \
 182       const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);           \
 183       HOST_WIDE_INT size;                                               \
 184       if (!flag_inhibit_size_directive && DECL_SIZE (DECL)              \
 185           && ! AT_END && TOP_LEVEL                                      \
 186           && DECL_INITIAL (DECL) == error_mark_node                     \
 187           && !size_directive_output)                                    \
 188         {                                                               \
 189           size_directive_output = 1;                                    \
 190           size = int_size_in_bytes (TREE_TYPE (DECL));                  \
 191           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);                 \
 192         }                                                               \
 193     }                                                                   \
 194   while (0)
 195
 196
 197 /* This is how to declare the size of a function.  */
 198
 199 #undef ASM_DECLARE_FUNCTION_SIZE
 200 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 201   do                                                                    \
 202     {                                                                   \
 203       if (!flag_inhibit_size_directive)                                 \
 204         ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                         \
 205     }                                                                   \
 206   while (0)