| 1 | /* SOM object file format. |
| 2 | Copyright (C) 1993-2015 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as |
| 8 | published by the Free Software Foundation; either version 3, |
| 9 | or (at your option) any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 14 | the GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 19 | 02110-1301, USA. |
| 20 | |
| 21 | Written by the Center for Software Science at the University of Utah |
| 22 | and by Cygnus Support. */ |
| 23 | |
| 24 | #include "as.h" |
| 25 | #include "subsegs.h" |
| 26 | #include "aout/stab_gnu.h" |
| 27 | |
| 28 | static int version_seen = 0; |
| 29 | static int copyright_seen = 0; |
| 30 | static int compiler_seen = 0; |
| 31 | |
| 32 | /* Unused by SOM. */ |
| 33 | |
| 34 | void |
| 35 | obj_read_begin_hook (void) |
| 36 | { |
| 37 | } |
| 38 | |
| 39 | /* Handle a .compiler directive. This is intended to create the |
| 40 | compilation unit auxiliary header for MPE such that the linkeditor |
| 41 | can handle SOM extraction from archives. The format of the quoted |
| 42 | string is "sourcefile language version" and is delimited by blanks. */ |
| 43 | |
| 44 | void |
| 45 | obj_som_compiler (int unused ATTRIBUTE_UNUSED) |
| 46 | { |
| 47 | char *buf; |
| 48 | char c; |
| 49 | char *filename; |
| 50 | char *language_name; |
| 51 | char *p; |
| 52 | char *version_id; |
| 53 | |
| 54 | if (compiler_seen) |
| 55 | { |
| 56 | as_bad (_("Only one .compiler pseudo-op per file!")); |
| 57 | ignore_rest_of_line (); |
| 58 | return; |
| 59 | } |
| 60 | |
| 61 | SKIP_WHITESPACE (); |
| 62 | if (*input_line_pointer == '\"') |
| 63 | { |
| 64 | buf = input_line_pointer; |
| 65 | ++input_line_pointer; |
| 66 | while (is_a_char (next_char_of_string ())) |
| 67 | ; |
| 68 | c = *input_line_pointer; |
| 69 | *input_line_pointer = '\000'; |
| 70 | } |
| 71 | else |
| 72 | { |
| 73 | as_bad (_("Expected quoted string")); |
| 74 | ignore_rest_of_line (); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | /* Parse the quoted string into its component parts. Skip the |
| 79 | quote. */ |
| 80 | filename = buf + 1; |
| 81 | p = filename; |
| 82 | while (*p != ' ' && *p != '\000') |
| 83 | p++; |
| 84 | if (*p == '\000') |
| 85 | { |
| 86 | as_bad (_(".compiler directive missing language and version")); |
| 87 | return; |
| 88 | } |
| 89 | *p = '\000'; |
| 90 | |
| 91 | language_name = ++p; |
| 92 | while (*p != ' ' && *p != '\000') |
| 93 | p++; |
| 94 | if (*p == '\000') |
| 95 | { |
| 96 | as_bad (_(".compiler directive missing version")); |
| 97 | return; |
| 98 | } |
| 99 | *p = '\000'; |
| 100 | |
| 101 | version_id = ++p; |
| 102 | while (*p != '\000') |
| 103 | p++; |
| 104 | /* Remove the trailing quote. */ |
| 105 | *(--p) = '\000'; |
| 106 | |
| 107 | compiler_seen = 1; |
| 108 | if (! bfd_som_attach_compilation_unit (stdoutput, filename, language_name, |
| 109 | "GNU Tools", version_id)) |
| 110 | { |
| 111 | bfd_perror (stdoutput->filename); |
| 112 | as_fatal (_("FATAL: Attaching compiler header %s"), stdoutput->filename); |
| 113 | } |
| 114 | *input_line_pointer = c; |
| 115 | demand_empty_rest_of_line (); |
| 116 | } |
| 117 | |
| 118 | /* Handle a .version directive. */ |
| 119 | |
| 120 | void |
| 121 | obj_som_version (int unused ATTRIBUTE_UNUSED) |
| 122 | { |
| 123 | char *version, c; |
| 124 | |
| 125 | if (version_seen) |
| 126 | { |
| 127 | as_bad (_("Only one .version pseudo-op per file!")); |
| 128 | ignore_rest_of_line (); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | SKIP_WHITESPACE (); |
| 133 | if (*input_line_pointer == '\"') |
| 134 | { |
| 135 | version = input_line_pointer; |
| 136 | ++input_line_pointer; |
| 137 | while (is_a_char (next_char_of_string ())) |
| 138 | ; |
| 139 | c = *input_line_pointer; |
| 140 | *input_line_pointer = '\000'; |
| 141 | } |
| 142 | else |
| 143 | { |
| 144 | as_bad (_("Expected quoted string")); |
| 145 | ignore_rest_of_line (); |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | version_seen = 1; |
| 150 | if (!bfd_som_attach_aux_hdr (stdoutput, VERSION_AUX_ID, version)) |
| 151 | as_fatal (_("attaching version header %s: %s"), |
| 152 | stdoutput->filename, bfd_errmsg (bfd_get_error ())); |
| 153 | |
| 154 | *input_line_pointer = c; |
| 155 | demand_empty_rest_of_line (); |
| 156 | } |
| 157 | |
| 158 | /* Handle a .copyright directive. This probably isn't complete, but |
| 159 | it's of dubious value anyway and (IMHO) not worth the time to finish. |
| 160 | If you care about copyright strings that much, you fix it. */ |
| 161 | |
| 162 | void |
| 163 | obj_som_copyright (int unused ATTRIBUTE_UNUSED) |
| 164 | { |
| 165 | char *copyright, c; |
| 166 | |
| 167 | if (copyright_seen) |
| 168 | { |
| 169 | as_bad (_("Only one .copyright pseudo-op per file!")); |
| 170 | ignore_rest_of_line (); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | SKIP_WHITESPACE (); |
| 175 | if (*input_line_pointer == '\"') |
| 176 | { |
| 177 | copyright = input_line_pointer; |
| 178 | ++input_line_pointer; |
| 179 | while (is_a_char (next_char_of_string ())) |
| 180 | ; |
| 181 | c = *input_line_pointer; |
| 182 | *input_line_pointer = '\000'; |
| 183 | } |
| 184 | else |
| 185 | { |
| 186 | as_bad (_("Expected quoted string")); |
| 187 | ignore_rest_of_line (); |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | copyright_seen = 1; |
| 192 | if (!bfd_som_attach_aux_hdr (stdoutput, COPYRIGHT_AUX_ID, copyright)) |
| 193 | as_fatal (_("attaching copyright header %s: %s"), |
| 194 | stdoutput->filename, bfd_errmsg (bfd_get_error ())); |
| 195 | |
| 196 | *input_line_pointer = c; |
| 197 | demand_empty_rest_of_line (); |
| 198 | } |
| 199 | |
| 200 | /* Perform any initialization necessary for stabs support. |
| 201 | |
| 202 | For SOM we need to create the space which will contain the |
| 203 | two stabs subspaces. Additionally we need to set up the |
| 204 | space/subspace relationships and set space/subspace attributes |
| 205 | which BFD does not understand. */ |
| 206 | |
| 207 | void |
| 208 | obj_som_init_stab_section (segT seg) |
| 209 | { |
| 210 | segT saved_seg = now_seg; |
| 211 | segT space; |
| 212 | subsegT saved_subseg = now_subseg; |
| 213 | char *p, *file; |
| 214 | unsigned int stroff; |
| 215 | |
| 216 | /* Make the space which will contain the debug subspaces. */ |
| 217 | space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$"); |
| 218 | |
| 219 | /* Set SOM specific attributes for the space. In particular we set |
| 220 | the space "defined", "private", "sort_key", and "spnum" values. |
| 221 | |
| 222 | Due to a bug in pxdb (called by hpux linker), the sort keys |
| 223 | of the various stabs spaces/subspaces need to be "small". We |
| 224 | reserve range 72/73 which appear to work well. */ |
| 225 | obj_set_section_attributes (space, 1, 1, 72, 2); |
| 226 | bfd_set_section_alignment (stdoutput, space, 2); |
| 227 | |
| 228 | /* Set the containing space for both stab sections to be $GDB_DEBUG$ |
| 229 | (just created above). Also set some attributes which BFD does |
| 230 | not understand. In particular, access bits, sort keys, and load |
| 231 | quadrant. */ |
| 232 | obj_set_subsection_attributes (seg, space, 0x1f, 73, 0, 0, 0, 0); |
| 233 | bfd_set_section_alignment (stdoutput, seg, 2); |
| 234 | |
| 235 | /* Make some space for the first special stab entry and zero the memory. |
| 236 | It contains information about the length of this file's |
| 237 | stab string and the like. Using it avoids the need to |
| 238 | relocate the stab strings. |
| 239 | |
| 240 | The $GDB_STRINGS$ space will be created as a side effect of |
| 241 | the call to get_stab_string_offset. */ |
| 242 | p = frag_more (12); |
| 243 | memset (p, 0, 12); |
| 244 | as_where (&file, (unsigned int *) NULL); |
| 245 | stroff = get_stab_string_offset (file, "$GDB_STRINGS$"); |
| 246 | know (stroff == 1); |
| 247 | md_number_to_chars (p, stroff, 4); |
| 248 | seg_info (seg)->stabu.p = p; |
| 249 | |
| 250 | /* Set the containing space for both stab sections to be $GDB_DEBUG$ |
| 251 | (just created above). Also set some attributes which BFD does |
| 252 | not understand. In particular, access bits, sort keys, and load |
| 253 | quadrant. */ |
| 254 | seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$"); |
| 255 | obj_set_subsection_attributes (seg, space, 0x1f, 72, 0, 0, 0, 0); |
| 256 | bfd_set_section_alignment (stdoutput, seg, 2); |
| 257 | |
| 258 | subseg_set (saved_seg, saved_subseg); |
| 259 | } |
| 260 | |
| 261 | /* Fill in the counts in the first entry in a .stabs section. */ |
| 262 | |
| 263 | static void |
| 264 | adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
| 265 | { |
| 266 | asection *strsec; |
| 267 | char *p; |
| 268 | int strsz, nsyms; |
| 269 | |
| 270 | if (strcmp ("$GDB_SYMBOLS$", sec->name)) |
| 271 | return; |
| 272 | |
| 273 | strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$"); |
| 274 | if (strsec) |
| 275 | strsz = bfd_section_size (abfd, strsec); |
| 276 | else |
| 277 | strsz = 0; |
| 278 | nsyms = bfd_section_size (abfd, sec) / 12 - 1; |
| 279 | |
| 280 | p = seg_info (sec)->stabu.p; |
| 281 | gas_assert (p != 0); |
| 282 | |
| 283 | bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6); |
| 284 | bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8); |
| 285 | } |
| 286 | |
| 287 | /* Called late in the assembly phase to adjust the special |
| 288 | stab entry and to set the starting address for each code subspace. */ |
| 289 | |
| 290 | void |
| 291 | som_frob_file (void) |
| 292 | { |
| 293 | bfd_map_over_sections (stdoutput, adjust_stab_sections, (void *) 0); |
| 294 | } |
| 295 | |
| 296 | static void |
| 297 | obj_som_weak (int ignore ATTRIBUTE_UNUSED) |
| 298 | { |
| 299 | char *name; |
| 300 | int c; |
| 301 | symbolS *symbolP; |
| 302 | |
| 303 | do |
| 304 | { |
| 305 | name = input_line_pointer; |
| 306 | c = get_symbol_end (); |
| 307 | symbolP = symbol_find_or_make (name); |
| 308 | *input_line_pointer = c; |
| 309 | SKIP_WHITESPACE (); |
| 310 | S_SET_WEAK (symbolP); |
| 311 | if (c == ',') |
| 312 | { |
| 313 | input_line_pointer++; |
| 314 | SKIP_WHITESPACE (); |
| 315 | if (*input_line_pointer == '\n') |
| 316 | c = '\n'; |
| 317 | } |
| 318 | } |
| 319 | while (c == ','); |
| 320 | demand_empty_rest_of_line (); |
| 321 | } |
| 322 | |
| 323 | const pseudo_typeS obj_pseudo_table[] = |
| 324 | { |
| 325 | {"weak", obj_som_weak, 0}, |
| 326 | {NULL, NULL, 0} |
| 327 | }; |