ld/emultempl/pdp11.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2006-2023 Free Software Foundation, Inc.
   3 #
   4 # This file is part of the GNU Binutils.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19 # MA 02110-1301, USA.
  20
  21 fragment <<EOF
  22
  23 /* --- \begin{pdp11.em} */
  24 #include "libiberty.h"
  25 #include "getopt.h"
  26
  27 static void
  28 gld${EMULATION_NAME}_before_parse (void)
  29 {
  30   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  31   /* for PDP11 Unix compatibility, default to --omagic */
  32   config.magic_demand_paged = false;
  33   config.text_read_only = false;
  34 }
  35
  36 /* PDP11 specific options.  */
  37 #define OPTION_IMAGIC 301
  38
  39 static void
  40 gld${EMULATION_NAME}_add_options
  41   (int ns ATTRIBUTE_UNUSED,
  42    char **shortopts,
  43    int nl,
  44    struct option **longopts,
  45    int nrl ATTRIBUTE_UNUSED,
  46    struct option **really_longopts ATTRIBUTE_UNUSED)
  47 {
  48   static const char xtra_short[] = "z";
  49   static const struct option xtra_long[] =
  50   {
  51     {"imagic", no_argument, NULL, OPTION_IMAGIC},
  52     {NULL, no_argument, NULL, 0}
  53   };
  54
  55   *shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
  56   memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
  57   *longopts
  58     = xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
  59   memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
  60 }
  61
  62 static void
  63 gld${EMULATION_NAME}_list_options (FILE *file)
  64 {
  65   fprintf (file, _("  -N, --omagic   Do not make text readonly, do not page align data (default)\n"));
  66   fprintf (file, _("  -n, --nmagic   Make text readonly, align data to next page\n"));
  67   fprintf (file, _("  -z, --imagic   Make text readonly, separate instruction and data spaces\n"));
  68   fprintf (file, _("  --no-omagic    Equivalent to --nmagic\n"));
  69 }
  70
  71 static bool
  72 gld${EMULATION_NAME}_handle_option (int optc)
  73 {
  74   switch (optc)
  75     {
  76     default:
  77       return false;
  78
  79     case 'z':
  80     case OPTION_IMAGIC:
  81       link_info.separate_code = 1;
  82       /* The --imagic format causes the .text and .data sections to occupy the
  83          same memory addresses in separate spaces, so don't check overlap. */
  84       command_line.check_section_addresses = 0;
  85       break;
  86     }
  87
  88   return true;
  89 }
  90
  91 /* We need a special case to prepare an additional linker script for option
  92  * --imagic where the .data section starts at address 0 rather than directly
  93  * following the .text section or being aligned to the next page after the
  94  * .text section. */
  95 static char *
  96 gld${EMULATION_NAME}_get_script (int *isfile)
  97 EOF
  98
  99 if test x"$COMPILE_IN" = xyes
 100 then
 101 # Scripts compiled in.
 102
 103 # sed commands to quote an ld script as a C string.
 104 sc="-f stringify.sed"
 105
 106 fragment <<EOF
 107 {
 108   *isfile = 0;
 109
 110   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 111     return
 112 EOF
 113 sed $sc ldscripts/${EMULATION_NAME}.xu                  >> e${EMULATION_NAME}.c
 114 echo '  ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
 115 sed $sc ldscripts/${EMULATION_NAME}.xr                  >> e${EMULATION_NAME}.c
 116 echo '  ; else if (link_info.separate_code) return'     >> e${EMULATION_NAME}.c
 117 sed $sc ldscripts/${EMULATION_NAME}.xe                  >> e${EMULATION_NAME}.c
 118 echo '  ; else if (!config.text_read_only) return'      >> e${EMULATION_NAME}.c
 119 sed $sc ldscripts/${EMULATION_NAME}.xbn                 >> e${EMULATION_NAME}.c
 120 echo '  ; else if (!config.magic_demand_paged) return'  >> e${EMULATION_NAME}.c
 121 sed $sc ldscripts/${EMULATION_NAME}.xn                  >> e${EMULATION_NAME}.c
 122 echo '  ; else return'                                  >> e${EMULATION_NAME}.c
 123 sed $sc ldscripts/${EMULATION_NAME}.x                   >> e${EMULATION_NAME}.c
 124 echo '; }'                                              >> e${EMULATION_NAME}.c
 125
 126 else
 127 # Scripts read from the filesystem.
 128
 129 fragment <<EOF
 130 {
 131   *isfile = 1;
 132
 133   if (bfd_link_relocatable (&link_info) && config.build_constructors)
 134     return "ldscripts/${EMULATION_NAME}.xu";
 135   else if (bfd_link_relocatable (&link_info))
 136     return "ldscripts/${EMULATION_NAME}.xr";
 137   else if (link_info.separate_code)
 138     return "ldscripts/${EMULATION_NAME}.xe";
 139   else if (!config.text_read_only)
 140     return "ldscripts/${EMULATION_NAME}.xbn";
 141   else if (!config.magic_demand_paged)
 142     return "ldscripts/${EMULATION_NAME}.xn";
 143   else
 144     return "ldscripts/${EMULATION_NAME}.x";
 145 }
 146 EOF
 147 fi
 148
 149 fragment <<EOF
 150
 151 /* --- \end{pdp11.em} */
 152
 153 EOF
 154
 155 LDEMUL_BEFORE_PARSE=gld"$EMULATION_NAME"_before_parse
 156 LDEMUL_ADD_OPTIONS=gld"$EMULATION_NAME"_add_options
 157 LDEMUL_HANDLE_OPTION=gld"$EMULATION_NAME"_handle_option
 158 LDEMUL_LIST_OPTIONS=gld"$EMULATION_NAME"_list_options
 159 LDEMUL_GET_SCRIPT=gld"$EMULATION_NAME"_get_script