1/* SOM object file format. 2 Copyright (C) 1993-2020 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 28static int version_seen = 0; 29static int copyright_seen = 0; 30static int compiler_seen = 0; 31 32/* Unused by SOM. */ 33 34void 35obj_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 44void 45obj_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 120void 121obj_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 162void 163obj_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 207void 208obj_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 /* Nothing to do if the section has already been created. */ 218 if (bfd_get_section_by_name (stdoutput, "$GDB_DEBUG$")) 219 return; 220 221 /* Make the space which will contain the debug subspaces. */ 222 space = bfd_make_section_old_way (stdoutput, "$GDB_DEBUG$"); 223 224 /* Set SOM specific attributes for the space. In particular we set 225 the space "defined", "private", "sort_key", and "spnum" values. 226 227 Due to a bug in pxdb (called by hpux linker), the sort keys 228 of the various stabs spaces/subspaces need to be "small". We 229 reserve range 72/73 which appear to work well. */ 230 obj_set_section_attributes (space, 1, 1, 72, 2); 231 bfd_set_section_alignment (space, 2); 232 233 /* Set the containing space for both stab sections to be $GDB_DEBUG$ 234 (just created above). Also set some attributes which BFD does 235 not understand. In particular, access bits, sort keys, and load 236 quadrant. */ 237 obj_set_subsection_attributes (seg, space, 0x1f, 73, 0, 0, 0, 0); 238 bfd_set_section_alignment (seg, 2); 239 240 /* Make some space for the first special stab entry and zero the memory. 241 It contains information about the length of this file's 242 stab string and the like. Using it avoids the need to 243 relocate the stab strings. 244 245 The $GDB_STRINGS$ space will be created as a side effect of 246 the call to get_stab_string_offset. */ 247 p = frag_more (12); 248 memset (p, 0, 12); 249 file = as_where ((unsigned int *) NULL); 250 stroff = get_stab_string_offset (file, "$GDB_STRINGS$", FALSE); 251 know (stroff == 1); 252 md_number_to_chars (p, stroff, 4); 253 seg_info (seg)->stabu.p = p; 254 255 /* Set the containing space for both stab sections to be $GDB_DEBUG$ 256 (just created above). Also set some attributes which BFD does 257 not understand. In particular, access bits, sort keys, and load 258 quadrant. */ 259 seg = bfd_get_section_by_name (stdoutput, "$GDB_STRINGS$"); 260 obj_set_subsection_attributes (seg, space, 0x1f, 72, 0, 0, 0, 0); 261 bfd_set_section_alignment (seg, 2); 262 263 subseg_set (saved_seg, saved_subseg); 264} 265 266/* Fill in the counts in the first entry in a .stabs section. */ 267 268static void 269adjust_stab_sections (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) 270{ 271 asection *strsec; 272 char *p; 273 int strsz, nsyms; 274 275 if (strcmp ("$GDB_SYMBOLS$", sec->name)) 276 return; 277 278 strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$"); 279 if (strsec) 280 strsz = bfd_section_size (strsec); 281 else 282 strsz = 0; 283 nsyms = bfd_section_size (sec) / 12 - 1; 284 285 p = seg_info (sec)->stabu.p; 286 gas_assert (p != 0); 287 288 bfd_h_put_16 (abfd, (bfd_vma) nsyms, (bfd_byte *) p + 6); 289 bfd_h_put_32 (abfd, (bfd_vma) strsz, (bfd_byte *) p + 8); 290} 291 292/* Called late in the assembly phase to adjust the special 293 stab entry and to set the starting address for each code subspace. */ 294 295void 296som_frob_file (void) 297{ 298 bfd_map_over_sections (stdoutput, adjust_stab_sections, (void *) 0); 299} 300 301static void 302obj_som_weak (int ignore ATTRIBUTE_UNUSED) 303{ 304 char *name; 305 int c; 306 symbolS *symbolP; 307 308 do 309 { 310 c = get_symbol_name (&name); 311 symbolP = symbol_find_or_make (name); 312 *input_line_pointer = c; 313 SKIP_WHITESPACE_AFTER_NAME (); 314 S_SET_WEAK (symbolP); 315 if (c == ',') 316 { 317 input_line_pointer++; 318 SKIP_WHITESPACE (); 319 if (*input_line_pointer == '\n') 320 c = '\n'; 321 } 322 } 323 while (c == ','); 324 demand_empty_rest_of_line (); 325} 326 327const pseudo_typeS obj_pseudo_table[] = 328{ 329 {"weak", obj_som_weak, 0}, 330 {NULL, NULL, 0} 331}; 332