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bfe2f12b JL |
1 | /* Read HP PA/Risc object files for GDB. |
2 | Copyright 1991, 1992 Free Software Foundation, Inc. | |
3 | Written by Fred Fish at Cygnus Support. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program 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 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program 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 this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "bfd.h" | |
bfe2f12b JL |
23 | #include "som.h" |
24 | #include "libhppa.h" | |
25 | #include <syms.h> | |
26 | #include "symtab.h" | |
27 | #include "symfile.h" | |
28 | #include "objfiles.h" | |
29 | #include "buildsym.h" | |
30 | #include "stabsread.h" | |
31 | #include "gdb-stabs.h" | |
32 | #include "complaints.h" | |
33 | #include <string.h> | |
34 | #include "demangle.h" | |
35 | #include <sys/file.h> | |
36 | ||
bfe2f12b JL |
37 | /* Various things we might complain about... */ |
38 | ||
39 | static void | |
6a86fa48 | 40 | som_symfile_init PARAMS ((struct objfile *)); |
bfe2f12b JL |
41 | |
42 | static void | |
43 | som_new_init PARAMS ((struct objfile *)); | |
44 | ||
45 | static void | |
46 | som_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); | |
47 | ||
48 | static void | |
49 | som_symfile_finish PARAMS ((struct objfile *)); | |
50 | ||
51 | static void | |
bb140953 JL |
52 | som_symtab_read PARAMS ((bfd *, struct objfile *, |
53 | struct section_offsets *)); | |
bfe2f12b | 54 | |
bfe2f12b JL |
55 | static struct section_offsets * |
56 | som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
57 | ||
58 | static void | |
59 | record_minimal_symbol PARAMS ((char *, CORE_ADDR, | |
60 | enum minimal_symbol_type, | |
61 | struct objfile *)); | |
62 | ||
63 | static void | |
64 | record_minimal_symbol (name, address, ms_type, objfile) | |
65 | char *name; | |
66 | CORE_ADDR address; | |
67 | enum minimal_symbol_type ms_type; | |
68 | struct objfile *objfile; | |
69 | { | |
70 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
71 | prim_record_minimal_symbol (name, address, ms_type, objfile); | |
72 | } | |
73 | ||
74 | /* | |
75 | ||
76 | LOCAL FUNCTION | |
77 | ||
78 | som_symtab_read -- read the symbol table of a SOM file | |
79 | ||
80 | SYNOPSIS | |
81 | ||
bb140953 JL |
82 | void som_symtab_read (bfd *abfd, struct objfile *objfile, |
83 | struct section_offsets *section_offsets) | |
bfe2f12b JL |
84 | |
85 | DESCRIPTION | |
86 | ||
87 | Given an open bfd, a base address to relocate symbols to, and a | |
88 | flag that specifies whether or not this bfd is for an executable | |
89 | or not (may be shared library for example), add all the global | |
90 | function and data symbols to the minimal symbol table. | |
91 | */ | |
92 | ||
93 | static void | |
bb140953 | 94 | som_symtab_read (abfd, objfile, section_offsets) |
bfe2f12b | 95 | bfd *abfd; |
bfe2f12b | 96 | struct objfile *objfile; |
bb140953 | 97 | struct section_offsets *section_offsets; |
bfe2f12b JL |
98 | { |
99 | unsigned int number_of_symbols; | |
bfe2f12b JL |
100 | int val, dynamic; |
101 | char *stringtab; | |
102 | asection *shlib_info; | |
103 | struct symbol_dictionary_record *buf, *bufp, *endbufp; | |
104 | char *symname; | |
105 | CONST int symsize = sizeof (struct symbol_dictionary_record); | |
506af7a7 | 106 | CORE_ADDR text_offset, data_offset; |
bb140953 JL |
107 | |
108 | ||
bb140953 | 109 | text_offset = ANOFFSET (section_offsets, 0); |
506af7a7 | 110 | data_offset = ANOFFSET (section_offsets, 1); |
bfe2f12b JL |
111 | |
112 | number_of_symbols = bfd_get_symcount (abfd); | |
113 | ||
114 | buf = alloca (symsize * number_of_symbols); | |
115 | bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET); | |
116 | val = bfd_read (buf, symsize * number_of_symbols, 1, abfd); | |
117 | if (val != symsize * number_of_symbols) | |
118 | error ("Couldn't read symbol dictionary!"); | |
119 | ||
120 | stringtab = alloca (obj_som_stringtab_size (abfd)); | |
121 | bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET); | |
122 | val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd); | |
123 | if (val != obj_som_stringtab_size (abfd)) | |
124 | error ("Can't read in HP string table."); | |
125 | ||
126 | /* We need to determine if objfile is a dynamic executable (so we | |
127 | can do the right thing for ST_ENTRY vs ST_CODE symbols). | |
128 | ||
129 | There's nothing in the header which easily allows us to do | |
130 | this. The only reliable way I know of is to check for the | |
131 | existance of a $SHLIB_INFO$ section with a non-zero size. */ | |
132 | shlib_info = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$"); | |
133 | if (shlib_info) | |
134 | dynamic = (bfd_section_size (objfile->obfd, shlib_info) != 0); | |
135 | else | |
136 | dynamic = 0; | |
137 | ||
138 | endbufp = buf + number_of_symbols; | |
139 | for (bufp = buf; bufp < endbufp; ++bufp) | |
140 | { | |
141 | enum minimal_symbol_type ms_type; | |
142 | ||
143 | QUIT; | |
144 | ||
145 | switch (bufp->symbol_scope) | |
146 | { | |
147 | case SS_UNIVERSAL: | |
148 | case SS_EXTERNAL: | |
149 | switch (bufp->symbol_type) | |
150 | { | |
151 | case ST_SYM_EXT: | |
152 | case ST_ARG_EXT: | |
153 | continue; | |
154 | ||
155 | case ST_CODE: | |
156 | case ST_PRI_PROG: | |
157 | case ST_SEC_PROG: | |
158 | case ST_MILLICODE: | |
159 | symname = bufp->name.n_strx + stringtab; | |
160 | ms_type = mst_text; | |
bb140953 | 161 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
162 | #ifdef SMASH_TEXT_ADDRESS |
163 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
164 | #endif | |
165 | break; | |
166 | ||
167 | case ST_ENTRY: | |
168 | symname = bufp->name.n_strx + stringtab; | |
169 | /* For a dynamic executable, ST_ENTRY symbols are | |
170 | the stubs, while the ST_CODE symbol is the real | |
171 | function. */ | |
172 | if (dynamic) | |
173 | ms_type = mst_solib_trampoline; | |
174 | else | |
175 | ms_type = mst_text; | |
bb140953 | 176 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
177 | #ifdef SMASH_TEXT_ADDRESS |
178 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
179 | #endif | |
180 | break; | |
181 | ||
182 | case ST_STUB: | |
183 | symname = bufp->name.n_strx + stringtab; | |
184 | ms_type = mst_solib_trampoline; | |
bb140953 | 185 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
186 | #ifdef SMASH_TEXT_ADDRESS |
187 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
188 | #endif | |
189 | break; | |
190 | ||
191 | case ST_DATA: | |
192 | symname = bufp->name.n_strx + stringtab; | |
506af7a7 | 193 | bufp->symbol_value += data_offset; |
bfe2f12b JL |
194 | ms_type = mst_data; |
195 | break; | |
196 | default: | |
197 | continue; | |
198 | } | |
199 | break; | |
200 | ||
201 | #if 0 | |
202 | /* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */ | |
203 | case SS_GLOBAL: | |
204 | #endif | |
205 | case SS_LOCAL: | |
206 | switch (bufp->symbol_type) | |
207 | { | |
208 | case ST_SYM_EXT: | |
209 | case ST_ARG_EXT: | |
210 | continue; | |
211 | ||
212 | case ST_CODE: | |
213 | symname = bufp->name.n_strx + stringtab; | |
214 | ms_type = mst_file_text; | |
bb140953 | 215 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
216 | #ifdef SMASH_TEXT_ADDRESS |
217 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
218 | #endif | |
219 | ||
220 | check_strange_names: | |
221 | /* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local | |
222 | label prefixes for stabs, constant data, etc. So we need | |
223 | only filter out L$ symbols which are left in due to | |
224 | limitations in how GAS generates SOM relocations. | |
225 | ||
226 | When linking in the HPUX C-library the HP linker has | |
227 | the nasty habit of placing section symbols from the literal | |
228 | subspaces in the middle of the program's text. Filter | |
229 | those out as best we can. Check for first and last character | |
230 | being '$'. */ | |
231 | if ((symname[0] == 'L' && symname[1] == '$') | |
232 | || (symname[0] == '$' && symname[strlen(symname) - 1] == '$')) | |
233 | continue; | |
234 | break; | |
235 | ||
236 | case ST_PRI_PROG: | |
237 | case ST_SEC_PROG: | |
238 | case ST_MILLICODE: | |
239 | symname = bufp->name.n_strx + stringtab; | |
240 | ms_type = mst_file_text; | |
bb140953 | 241 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
242 | #ifdef SMASH_TEXT_ADDRESS |
243 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
244 | #endif | |
245 | break; | |
246 | ||
247 | case ST_ENTRY: | |
248 | symname = bufp->name.n_strx + stringtab; | |
249 | /* For a dynamic executable, ST_ENTRY symbols are | |
250 | the stubs, while the ST_CODE symbol is the real | |
251 | function. */ | |
252 | if (dynamic) | |
253 | ms_type = mst_solib_trampoline; | |
254 | else | |
255 | ms_type = mst_file_text; | |
bb140953 | 256 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
257 | #ifdef SMASH_TEXT_ADDRESS |
258 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
259 | #endif | |
260 | break; | |
261 | ||
262 | case ST_STUB: | |
263 | symname = bufp->name.n_strx + stringtab; | |
264 | ms_type = mst_solib_trampoline; | |
bb140953 | 265 | bufp->symbol_value += text_offset; |
bfe2f12b JL |
266 | #ifdef SMASH_TEXT_ADDRESS |
267 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
268 | #endif | |
269 | break; | |
270 | ||
271 | ||
272 | case ST_DATA: | |
273 | symname = bufp->name.n_strx + stringtab; | |
506af7a7 | 274 | bufp->symbol_value += data_offset; |
bfe2f12b JL |
275 | ms_type = mst_file_data; |
276 | goto check_strange_names; | |
277 | ||
278 | default: | |
279 | continue; | |
280 | } | |
281 | break; | |
282 | ||
283 | default: | |
284 | continue; | |
285 | } | |
286 | ||
287 | if (bufp->name.n_strx > obj_som_stringtab_size (abfd)) | |
288 | error ("Invalid symbol data; bad HP string table offset: %d", | |
289 | bufp->name.n_strx); | |
290 | ||
291 | record_minimal_symbol (symname, | |
292 | bufp->symbol_value, ms_type, | |
293 | objfile); | |
294 | } | |
bfe2f12b JL |
295 | } |
296 | ||
297 | /* Scan and build partial symbols for a symbol file. | |
298 | We have been initialized by a call to som_symfile_init, which | |
299 | currently does nothing. | |
300 | ||
301 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
302 | in each section. This is ignored, as it isn't needed for SOM. | |
303 | ||
304 | MAINLINE is true if we are reading the main symbol | |
305 | table (as opposed to a shared lib or dynamically loaded file). | |
306 | ||
307 | This function only does the minimum work necessary for letting the | |
308 | user "name" things symbolically; it does not read the entire symtab. | |
309 | Instead, it reads the external and static symbols and puts them in partial | |
310 | symbol tables. When more extensive information is requested of a | |
311 | file, the corresponding partial symbol table is mutated into a full | |
312 | fledged symbol table by going back and reading the symbols | |
313 | for real. | |
314 | ||
315 | We look for sections with specific names, to tell us what debug | |
316 | format to look for: FIXME!!! | |
317 | ||
318 | somstab_build_psymtabs() handles STABS symbols. | |
319 | ||
320 | Note that SOM files have a "minimal" symbol table, which is vaguely | |
321 | reminiscent of a COFF symbol table, but has only the minimal information | |
322 | necessary for linking. We process this also, and use the information to | |
323 | build gdb's minimal symbol table. This gives us some minimal debugging | |
324 | capability even for files compiled without -g. */ | |
325 | ||
326 | static void | |
327 | som_symfile_read (objfile, section_offsets, mainline) | |
328 | struct objfile *objfile; | |
329 | struct section_offsets *section_offsets; | |
330 | int mainline; | |
331 | { | |
332 | bfd *abfd = objfile->obfd; | |
333 | struct cleanup *back_to; | |
bfe2f12b JL |
334 | |
335 | init_minimal_symbol_collection (); | |
336 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
337 | ||
6a86fa48 | 338 | /* Process the normal SOM symbol table first. */ |
bfe2f12b | 339 | |
bb140953 | 340 | som_symtab_read (abfd, objfile, section_offsets); |
bfe2f12b | 341 | |
98c0e047 | 342 | /* Now read information from the stabs debug sections. */ |
6a86fa48 JL |
343 | stabsect_build_psymtabs (objfile, section_offsets, mainline, |
344 | "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$"); | |
bfe2f12b | 345 | |
98c0e047 JL |
346 | /* Now read the native debug information. */ |
347 | hpread_build_psymtabs (objfile, section_offsets, mainline); | |
98c0e047 | 348 | |
6a86fa48 JL |
349 | /* Install any minimal symbols that have been collected as the current |
350 | minimal symbols for this objfile. */ | |
351 | install_minimal_symbols (objfile); | |
bfe2f12b | 352 | |
31b2518a | 353 | /* Force hppa-tdep.c to re-read the unwind descriptors. */ |
c676d827 | 354 | objfile->obj_private = NULL; |
6a86fa48 | 355 | do_cleanups (back_to); |
bfe2f12b JL |
356 | } |
357 | ||
358 | /* Initialize anything that needs initializing when a completely new symbol | |
359 | file is specified (not just adding some symbols from another file, e.g. a | |
360 | shared library). | |
361 | ||
362 | We reinitialize buildsym, since we may be reading stabs from a SOM file. */ | |
363 | ||
364 | static void | |
365 | som_new_init (ignore) | |
366 | struct objfile *ignore; | |
367 | { | |
368 | stabsread_new_init (); | |
369 | buildsym_new_init (); | |
370 | } | |
371 | ||
372 | /* Perform any local cleanups required when we are done with a particular | |
373 | objfile. I.E, we are in the process of discarding all symbol information | |
374 | for an objfile, freeing up all memory held for it, and unlinking the | |
375 | objfile struct from the global list of known objfiles. */ | |
376 | ||
377 | static void | |
378 | som_symfile_finish (objfile) | |
379 | struct objfile *objfile; | |
380 | { | |
381 | if (objfile -> sym_stab_info != NULL) | |
382 | { | |
383 | mfree (objfile -> md, objfile -> sym_stab_info); | |
384 | } | |
98c0e047 | 385 | hpread_symfile_finish (objfile); |
bfe2f12b JL |
386 | } |
387 | ||
388 | /* SOM specific initialization routine for reading symbols. | |
389 | ||
6a86fa48 | 390 | Nothing SOM specific left to do anymore. */ |
bfe2f12b | 391 | static void |
98c0e047 JL |
392 | som_symfile_init (objfile) |
393 | struct objfile *objfile; | |
bfe2f12b | 394 | { |
98c0e047 | 395 | hpread_symfile_init (objfile); |
bfe2f12b JL |
396 | } |
397 | ||
398 | /* SOM specific parsing routine for section offsets. | |
399 | ||
400 | Plain and simple for now. */ | |
401 | ||
402 | static struct section_offsets * | |
403 | som_symfile_offsets (objfile, addr) | |
404 | struct objfile *objfile; | |
405 | CORE_ADDR addr; | |
406 | { | |
407 | struct section_offsets *section_offsets; | |
408 | int i; | |
409 | ||
410 | objfile->num_sections = SECT_OFF_MAX; | |
411 | section_offsets = (struct section_offsets *) | |
412 | obstack_alloc (&objfile -> psymbol_obstack, | |
413 | sizeof (struct section_offsets) | |
414 | + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
415 | ||
506af7a7 JL |
416 | /* First see if we're a shared library. If so, get the section |
417 | offsets from the library, else get them from addr. */ | |
418 | if (!som_solib_section_offsets (objfile, section_offsets)) | |
419 | { | |
420 | for (i = 0; i < SECT_OFF_MAX; i++) | |
421 | ANOFFSET (section_offsets, i) = addr; | |
422 | } | |
bfe2f12b JL |
423 | |
424 | return section_offsets; | |
425 | } | |
426 | \f | |
427 | /* Register that we are able to handle SOM object file formats. */ | |
428 | ||
429 | static struct sym_fns som_sym_fns = | |
430 | { | |
431 | bfd_target_som_flavour, | |
432 | som_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
433 | som_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
434 | som_symfile_read, /* sym_read: read a symbol file into symtab */ | |
435 | som_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
436 | som_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ | |
437 | NULL /* next: pointer to next struct sym_fns */ | |
438 | }; | |
439 | ||
440 | void | |
441 | _initialize_somread () | |
442 | { | |
443 | add_symtab_fns (&som_sym_fns); | |
444 | } |