1 /* SOM object file format. 2 Copyright (C) 1993-2016 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; 214 const char * file; 215 unsigned int stroff; 216 217 /* Make the space which will contain the debug subspaces. */ 218 space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$"); 219 220 /* Set SOM specific attributes for the space. In particular we set 221 the space "defined", "private", "sort_key", and "spnum" values. 222 223 Due to a bug in pxdb (called by hpux linker), the sort keys 224 of the various stabs spaces/subspaces need to be "small". We 225 reserve range 72/73 which appear to work well. */ 226 obj_set_section_attributes (space, 1, 1, 72, 2); 227 bfd_set_section_alignment (stdoutput, space, 2); 228 229 /* Set the containing space for both stab sections to be $GDB_DEBUG$ 230 (just created above). Also set some attributes which BFD does 231 not understand. In particular, access bits, sort keys, and load 232 quadrant. */ 233 obj_set_subsection_attributes (seg, space, 0x1f, 73, 0, 0, 0, 0); 234 bfd_set_section_alignment (stdoutput, seg, 2); 235 236 /* Make some space for the first special stab entry and zero the memory. 237 It contains information about the length of this file's 238 stab string and the like. Using it avoids the need to 239 relocate the stab strings. 240 241 The $GDB_STRINGS$ space will be created as a side effect of 242 the call to get_stab_string_offset. */ 243 p = frag_more (12); 244 memset (p, 0, 12); 245 file = as_where ((unsigned int *) NULL); 246 stroff = get_stab_string_offset (file, "$GDB_STRINGS$"); 247 know (stroff == 1); 248 md_number_to_chars (p, stroff, 4); 249 seg_info (seg)->stabu.p = p; 250 251 /* Set the containing space for both stab sections to be $GDB_DEBUG$ 252 (just created above). Also set some attributes which BFD does 253 not understand. In particular, access bits, sort keys, and load 254 quadrant. */ 255 seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$"); 256 obj_set_subsection_attributes (seg, space, 0x1f, 72, 0, 0, 0, 0); 257 bfd_set_section_alignment (stdoutput, seg, 2); 258 259 subseg_set (saved_seg, saved_subseg); 260 } 261 262 /* Fill in the counts in the first entry in a .stabs section. */ 263 264 static void 265 adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) 266 { 267 asection *strsec; 268 char *p; 269 int strsz, nsyms; 270 271 if (strcmp ("$GDB_SYMBOLS$", sec->name)) 272 return; 273 274 strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$"); 275 if (strsec) 276 strsz = bfd_section_size (abfd, strsec); 277 else 278 strsz = 0; 279 nsyms = bfd_section_size (abfd, sec) / 12 - 1; 280 281 p = seg_info (sec)->stabu.p; 282 gas_assert (p != 0); 283 284 bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6); 285 bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8); 286 } 287 288 /* Called late in the assembly phase to adjust the special 289 stab entry and to set the starting address for each code subspace. */ 290 291 void 292 som_frob_file (void) 293 { 294 bfd_map_over_sections (stdoutput, adjust_stab_sections, (void *) 0); 295 } 296 297 static void 298 obj_som_weak (int ignore ATTRIBUTE_UNUSED) 299 { 300 char *name; 301 int c; 302 symbolS *symbolP; 303 304 do 305 { 306 c = get_symbol_name (&name); 307 symbolP = symbol_find_or_make (name); 308 *input_line_pointer = c; 309 SKIP_WHITESPACE_AFTER_NAME (); 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 }; 328
