Commit | Line | Data |
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684a832f SG |
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 | ||
684a832f SG |
21 | #include "defs.h" |
22 | #include "bfd.h" | |
1225fcbd | 23 | #include <time.h> /* For time_t in libbfd.h. */ |
ddf5d7e8 | 24 | #include <sys/types.h> /* For time_t, if not in time.h. */ |
684a832f | 25 | #include "libbfd.h" |
61a29659 | 26 | #include "som.h" |
003ccb90 | 27 | #include "libhppa.h" |
684a832f SG |
28 | #include <syms.h> |
29 | #include "symtab.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "buildsym.h" | |
2731625a | 33 | #include "stabsread.h" |
684a832f SG |
34 | #include "gdb-stabs.h" |
35 | #include "complaints.h" | |
36 | #include <string.h> | |
37 | #include "demangle.h" | |
38 | #include <sys/file.h> | |
1225fcbd JK |
39 | |
40 | /* Size of n_value and n_strx fields in a stab symbol. */ | |
41 | #define BYTES_IN_WORD 4 | |
42 | ||
0213d96f | 43 | #include "aout/aout64.h" |
684a832f SG |
44 | |
45 | /* Various things we might complain about... */ | |
46 | ||
47 | static void | |
48 | pa_symfile_init PARAMS ((struct objfile *)); | |
49 | ||
50 | static void | |
51 | pa_new_init PARAMS ((struct objfile *)); | |
52 | ||
fa9265e5 SG |
53 | static void |
54 | read_unwind_info PARAMS ((struct objfile *)); | |
55 | ||
684a832f SG |
56 | static void |
57 | pa_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); | |
58 | ||
59 | static void | |
60 | pa_symfile_finish PARAMS ((struct objfile *)); | |
61 | ||
62 | static void | |
63 | pa_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); | |
64 | ||
65 | static void | |
66 | free_painfo PARAMS ((PTR)); | |
67 | ||
68 | static struct section_offsets * | |
69 | pa_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
70 | ||
71 | static void | |
72 | record_minimal_symbol PARAMS ((char *, CORE_ADDR, | |
73 | enum minimal_symbol_type, | |
74 | struct objfile *)); | |
75 | ||
76 | static void | |
77 | record_minimal_symbol (name, address, ms_type, objfile) | |
78 | char *name; | |
79 | CORE_ADDR address; | |
80 | enum minimal_symbol_type ms_type; | |
81 | struct objfile *objfile; | |
82 | { | |
83 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
84 | prim_record_minimal_symbol (name, address, ms_type); | |
85 | } | |
86 | ||
87 | /* | |
88 | ||
89 | LOCAL FUNCTION | |
90 | ||
91 | pa_symtab_read -- read the symbol table of a PA file | |
92 | ||
93 | SYNOPSIS | |
94 | ||
95 | void pa_symtab_read (bfd *abfd, CORE_ADDR addr, | |
96 | struct objfile *objfile) | |
97 | ||
98 | DESCRIPTION | |
99 | ||
100 | Given an open bfd, a base address to relocate symbols to, and a | |
101 | flag that specifies whether or not this bfd is for an executable | |
102 | or not (may be shared library for example), add all the global | |
103 | function and data symbols to the minimal symbol table. | |
104 | */ | |
105 | ||
106 | static void | |
107 | pa_symtab_read (abfd, addr, objfile) | |
108 | bfd *abfd; | |
109 | CORE_ADDR addr; | |
110 | struct objfile *objfile; | |
111 | { | |
112 | unsigned int number_of_symbols; | |
113 | unsigned int i; | |
114 | int val; | |
115 | char *stringtab; | |
3cde1ffa JK |
116 | struct symbol_dictionary_record *buf, *bufp, *endbufp; |
117 | char *symname; | |
0213d96f | 118 | CONST int symsize = sizeof (struct symbol_dictionary_record); |
684a832f | 119 | |
0213d96f | 120 | number_of_symbols = bfd_get_symcount (abfd); |
684a832f | 121 | |
0213d96f | 122 | buf = alloca (symsize * number_of_symbols); |
003ccb90 | 123 | bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET); |
0213d96f SG |
124 | val = bfd_read (buf, symsize * number_of_symbols, 1, abfd); |
125 | if (val != symsize * number_of_symbols) | |
684a832f SG |
126 | error ("Couldn't read symbol dictionary!"); |
127 | ||
003ccb90 KR |
128 | stringtab = alloca (obj_som_stringtab_size (abfd)); |
129 | bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET); | |
130 | val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd); | |
131 | if (val != obj_som_stringtab_size (abfd)) | |
684a832f | 132 | error ("Can't read in HP string table."); |
3cde1ffa JK |
133 | |
134 | endbufp = buf + number_of_symbols; | |
135 | for (bufp = buf; bufp < endbufp; ++bufp) | |
684a832f SG |
136 | { |
137 | enum minimal_symbol_type ms_type; | |
138 | ||
139 | QUIT; | |
140 | ||
3cde1ffa JK |
141 | switch (bufp->symbol_scope) |
142 | { | |
143 | case SS_UNIVERSAL: | |
144 | switch (bufp->symbol_type) | |
145 | { | |
146 | case ST_SYM_EXT: | |
147 | case ST_ARG_EXT: | |
148 | continue; | |
149 | ||
150 | case ST_CODE: | |
151 | case ST_PRI_PROG: | |
152 | case ST_SEC_PROG: | |
153 | case ST_ENTRY: | |
154 | case ST_MILLICODE: | |
155 | symname = bufp->name.n_strx + stringtab; | |
156 | ms_type = mst_text; | |
157 | bufp->symbol_value &= ~0x3; /* clear out permission bits */ | |
158 | break; | |
159 | case ST_DATA: | |
160 | symname = bufp->name.n_strx + stringtab; | |
161 | ms_type = mst_data; | |
162 | break; | |
163 | default: | |
164 | continue; | |
165 | } | |
166 | break; | |
167 | ||
247145e6 JK |
168 | #if 0 |
169 | /* SS_GLOBAL and SS_LOCAL are two names for the same thing (!). */ | |
3cde1ffa | 170 | case SS_GLOBAL: |
247145e6 | 171 | #endif |
3cde1ffa JK |
172 | case SS_LOCAL: |
173 | switch (bufp->symbol_type) | |
174 | { | |
175 | case ST_SYM_EXT: | |
176 | case ST_ARG_EXT: | |
177 | continue; | |
178 | ||
179 | case ST_CODE: | |
180 | symname = bufp->name.n_strx + stringtab; | |
247145e6 JK |
181 | ms_type = mst_file_text; |
182 | bufp->symbol_value &= ~0x3; /* clear out permission bits */ | |
183 | ||
184 | check_strange_names: | |
3cde1ffa JK |
185 | /* GAS leaves symbols with the prefixes "LS$", "LBB$", |
186 | and "LBE$" in .o files after assembling. And thus | |
187 | they appear in the final executable. This can | |
188 | cause problems if these special symbols have the | |
247145e6 | 189 | same value as real symbols. So ignore them. Also "LC$". */ |
3cde1ffa | 190 | if (*symname == 'L' |
247145e6 | 191 | && (symname[2] == '$' || symname[3] == '$')) |
3cde1ffa | 192 | continue; |
3cde1ffa JK |
193 | break; |
194 | ||
195 | case ST_PRI_PROG: | |
196 | case ST_SEC_PROG: | |
197 | case ST_ENTRY: | |
198 | case ST_MILLICODE: | |
199 | symname = bufp->name.n_strx + stringtab; | |
200 | ms_type = mst_file_text; | |
201 | bufp->symbol_value &= ~0x3; /* clear out permission bits */ | |
202 | break; | |
247145e6 | 203 | |
3cde1ffa JK |
204 | case ST_DATA: |
205 | symname = bufp->name.n_strx + stringtab; | |
206 | ms_type = mst_file_data; | |
247145e6 JK |
207 | goto check_strange_names; |
208 | ||
3cde1ffa JK |
209 | default: |
210 | continue; | |
211 | } | |
247145e6 JK |
212 | break; |
213 | ||
3cde1ffa JK |
214 | default: |
215 | continue; | |
216 | } | |
684a832f | 217 | |
003ccb90 | 218 | if (bufp->name.n_strx > obj_som_stringtab_size (abfd)) |
684a832f SG |
219 | error ("Invalid symbol data; bad HP string table offset: %d", |
220 | bufp->name.n_strx); | |
221 | ||
3cde1ffa | 222 | record_minimal_symbol (symname, |
684a832f SG |
223 | bufp->symbol_value, ms_type, |
224 | objfile); | |
225 | } | |
226 | ||
227 | install_minimal_symbols (objfile); | |
228 | } | |
229 | ||
fa9265e5 SG |
230 | /* Read in the backtrace information stored in the `$UNWIND_START$' section of |
231 | the object file. This info is used mainly by find_unwind_entry() to find | |
232 | out the stack frame size and frame pointer used by procedures. We put | |
233 | everything on the psymbol obstack in the objfile so that it automatically | |
234 | gets freed when the objfile is destroyed. */ | |
235 | ||
236 | static void | |
237 | read_unwind_info (objfile) | |
238 | struct objfile *objfile; | |
239 | { | |
240 | asection *unwind_sec; | |
241 | struct obj_unwind_info *ui; | |
242 | ||
243 | ui = obstack_alloc (&objfile->psymbol_obstack, | |
244 | sizeof (struct obj_unwind_info)); | |
245 | ||
246 | ui->table = NULL; | |
247 | ui->cache = NULL; | |
248 | ui->last = -1; | |
249 | ||
250 | unwind_sec = bfd_get_section_by_name (objfile->obfd, | |
251 | "$UNWIND_START$"); | |
252 | if (unwind_sec) | |
253 | { | |
254 | int size; | |
255 | int i, *ip; | |
256 | ||
257 | size = bfd_section_size (objfile->obfd, unwind_sec); | |
258 | ui->table = obstack_alloc (&objfile->psymbol_obstack, size); | |
259 | ui->last = size / sizeof (struct unwind_table_entry) - 1; | |
260 | ||
261 | bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table, | |
262 | 0, size); | |
263 | ||
264 | OBJ_UNWIND_INFO (objfile) = ui; | |
265 | } | |
266 | } | |
267 | ||
684a832f SG |
268 | /* Scan and build partial symbols for a symbol file. |
269 | We have been initialized by a call to pa_symfile_init, which | |
270 | currently does nothing. | |
271 | ||
272 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
273 | in each section. This is ignored, as it isn't needed for the PA. | |
274 | ||
275 | MAINLINE is true if we are reading the main symbol | |
276 | table (as opposed to a shared lib or dynamically loaded file). | |
277 | ||
278 | This function only does the minimum work necessary for letting the | |
279 | user "name" things symbolically; it does not read the entire symtab. | |
280 | Instead, it reads the external and static symbols and puts them in partial | |
281 | symbol tables. When more extensive information is requested of a | |
282 | file, the corresponding partial symbol table is mutated into a full | |
283 | fledged symbol table by going back and reading the symbols | |
284 | for real. | |
285 | ||
286 | We look for sections with specific names, to tell us what debug | |
287 | format to look for: FIXME!!! | |
288 | ||
289 | pastab_build_psymtabs() handles STABS symbols. | |
290 | ||
291 | Note that PA files have a "minimal" symbol table, which is vaguely | |
292 | reminiscent of a COFF symbol table, but has only the minimal information | |
293 | necessary for linking. We process this also, and use the information to | |
294 | build gdb's minimal symbol table. This gives us some minimal debugging | |
295 | capability even for files compiled without -g. */ | |
296 | ||
297 | static void | |
298 | pa_symfile_read (objfile, section_offsets, mainline) | |
299 | struct objfile *objfile; | |
300 | struct section_offsets *section_offsets; | |
301 | int mainline; | |
302 | { | |
303 | bfd *abfd = objfile->obfd; | |
304 | struct cleanup *back_to; | |
305 | CORE_ADDR offset; | |
306 | ||
307 | init_minimal_symbol_collection (); | |
308 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
309 | ||
310 | make_cleanup (free_painfo, (PTR) objfile); | |
311 | ||
312 | /* Process the normal PA symbol table first. */ | |
313 | ||
314 | /* FIXME, should take a section_offsets param, not just an offset. */ | |
315 | ||
316 | offset = ANOFFSET (section_offsets, 0); | |
317 | pa_symtab_read (abfd, offset, objfile); | |
318 | ||
319 | /* Now process debugging information, which is contained in | |
320 | special PA sections. */ | |
321 | ||
322 | pastab_build_psymtabs (objfile, section_offsets, mainline); | |
323 | ||
fa9265e5 SG |
324 | read_unwind_info(objfile); |
325 | ||
684a832f SG |
326 | do_cleanups (back_to); |
327 | } | |
328 | ||
965a5c32 | 329 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of |
684a832f SG |
330 | stab_section_info's, that might be dangling from it. */ |
331 | ||
332 | static void | |
333 | free_painfo (objp) | |
334 | PTR objp; | |
335 | { | |
336 | struct objfile *objfile = (struct objfile *)objp; | |
337 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
965a5c32 | 338 | objfile->sym_stab_info; |
684a832f SG |
339 | struct stab_section_info *ssi, *nssi; |
340 | ||
341 | ssi = dbxinfo->stab_section_info; | |
342 | while (ssi) | |
343 | { | |
344 | nssi = ssi->next; | |
345 | mfree (objfile->md, ssi); | |
346 | ssi = nssi; | |
347 | } | |
348 | ||
349 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
350 | } | |
351 | ||
352 | /* Initialize anything that needs initializing when a completely new symbol | |
353 | file is specified (not just adding some symbols from another file, e.g. a | |
354 | shared library). | |
355 | ||
356 | We reinitialize buildsym, since we may be reading stabs from a PA file. */ | |
357 | ||
358 | static void | |
359 | pa_new_init (ignore) | |
360 | struct objfile *ignore; | |
361 | { | |
362 | stabsread_new_init (); | |
363 | buildsym_new_init (); | |
364 | } | |
365 | ||
366 | /* Perform any local cleanups required when we are done with a particular | |
367 | objfile. I.E, we are in the process of discarding all symbol information | |
368 | for an objfile, freeing up all memory held for it, and unlinking the | |
369 | objfile struct from the global list of known objfiles. */ | |
370 | ||
371 | static void | |
372 | pa_symfile_finish (objfile) | |
373 | struct objfile *objfile; | |
374 | { | |
965a5c32 | 375 | if (objfile -> sym_stab_info != NULL) |
684a832f | 376 | { |
965a5c32 | 377 | mfree (objfile -> md, objfile -> sym_stab_info); |
684a832f SG |
378 | } |
379 | } | |
380 | ||
684a832f SG |
381 | /* PA specific initialization routine for reading symbols. |
382 | ||
383 | It is passed a pointer to a struct sym_fns which contains, among other | |
384 | things, the BFD for the file whose symbols are being read, and a slot for | |
385 | a pointer to "private data" which we can fill with goodies. | |
386 | ||
387 | This routine is almost a complete ripoff of dbx_symfile_init. The | |
388 | common parts of these routines should be extracted and used instead of | |
389 | duplicating this code. FIXME. */ | |
390 | ||
391 | static void | |
392 | pa_symfile_init (objfile) | |
393 | struct objfile *objfile; | |
394 | { | |
395 | int val; | |
396 | bfd *sym_bfd = objfile->obfd; | |
397 | char *name = bfd_get_filename (sym_bfd); | |
0213d96f SG |
398 | asection *stabsect; /* Section containing symbol table entries */ |
399 | asection *stringsect; /* Section containing symbol name strings */ | |
400 | ||
401 | stabsect = bfd_get_section_by_name (sym_bfd, "$GDB_SYMBOLS$"); | |
402 | stringsect = bfd_get_section_by_name (sym_bfd, "$GDB_STRINGS$"); | |
684a832f SG |
403 | |
404 | /* Allocate struct to keep track of the symfile */ | |
965a5c32 | 405 | objfile->sym_stab_info = (PTR) |
684a832f SG |
406 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); |
407 | ||
965a5c32 | 408 | memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
0213d96f SG |
409 | |
410 | if (!stabsect) | |
411 | return; | |
412 | ||
413 | if (!stringsect) | |
414 | error ("Found stabs, but not string section"); | |
415 | ||
684a832f | 416 | /* FIXME POKING INSIDE BFD DATA STRUCTURES */ |
0213d96f SG |
417 | #define STRING_TABLE_OFFSET (stringsect->filepos) |
418 | #define SYMBOL_TABLE_OFFSET (stabsect->filepos) | |
684a832f SG |
419 | |
420 | /* FIXME POKING INSIDE BFD DATA STRUCTURES */ | |
421 | ||
422 | DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL; | |
423 | DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); | |
424 | if (!DBX_TEXT_SECT (objfile)) | |
425 | error ("Can't find .text section in symbol file"); | |
426 | ||
1225fcbd JK |
427 | /* FIXME: I suspect this should be external_nlist. The size of host |
428 | types like long and bfd_vma should not affect how we read the | |
429 | file. */ | |
0213d96f SG |
430 | DBX_SYMBOL_SIZE (objfile) = sizeof (struct internal_nlist); |
431 | DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect) | |
432 | / DBX_SYMBOL_SIZE (objfile); | |
684a832f SG |
433 | DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; |
434 | ||
435 | /* Read the string table and stash it away in the psymbol_obstack. It is | |
436 | only needed as long as we need to expand psymbols into full symbols, | |
437 | so when we blow away the psymbol the string table goes away as well. | |
438 | Note that gdb used to use the results of attempting to malloc the | |
439 | string table, based on the size it read, as a form of sanity check | |
440 | for botched byte swapping, on the theory that a byte swapped string | |
441 | table size would be so totally bogus that the malloc would fail. Now | |
442 | that we put in on the psymbol_obstack, we can't do this since gdb gets | |
443 | a fatal error (out of virtual memory) if the size is bogus. We can | |
444 | however at least check to see if the size is zero or some negative | |
445 | value. */ | |
446 | ||
0213d96f | 447 | DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stringsect); |
684a832f SG |
448 | |
449 | if (DBX_SYMCOUNT (objfile) == 0 | |
450 | || DBX_STRINGTAB_SIZE (objfile) == 0) | |
451 | return; | |
452 | ||
453 | if (DBX_STRINGTAB_SIZE (objfile) <= 0 | |
454 | || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) | |
455 | error ("ridiculous string table size (%d bytes).", | |
456 | DBX_STRINGTAB_SIZE (objfile)); | |
457 | ||
458 | DBX_STRINGTAB (objfile) = | |
459 | (char *) obstack_alloc (&objfile -> psymbol_obstack, | |
460 | DBX_STRINGTAB_SIZE (objfile)); | |
461 | ||
462 | /* Now read in the string table in one big gulp. */ | |
463 | ||
464 | val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET); | |
465 | if (val < 0) | |
466 | perror_with_name (name); | |
467 | val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1, | |
468 | sym_bfd); | |
93af329a JK |
469 | if (val == 0) |
470 | error ("End of file reading string table"); | |
471 | else if (val < 0) | |
472 | /* It's possible bfd_read should be setting bfd_error, and we should be | |
473 | checking that. But currently it doesn't set bfd_error. */ | |
684a832f | 474 | perror_with_name (name); |
93af329a JK |
475 | else if (val != DBX_STRINGTAB_SIZE (objfile)) |
476 | error ("Short read reading string table"); | |
684a832f SG |
477 | } |
478 | ||
479 | /* PA specific parsing routine for section offsets. | |
480 | ||
481 | Plain and simple for now. */ | |
482 | ||
483 | static struct section_offsets * | |
484 | pa_symfile_offsets (objfile, addr) | |
485 | struct objfile *objfile; | |
486 | CORE_ADDR addr; | |
487 | { | |
488 | struct section_offsets *section_offsets; | |
489 | int i; | |
490 | ||
491 | section_offsets = (struct section_offsets *) | |
492 | obstack_alloc (&objfile -> psymbol_obstack, | |
493 | sizeof (struct section_offsets) + | |
494 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
495 | ||
496 | for (i = 0; i < SECT_OFF_MAX; i++) | |
497 | ANOFFSET (section_offsets, i) = addr; | |
498 | ||
499 | return section_offsets; | |
500 | } | |
501 | \f | |
502 | /* Register that we are able to handle PA object file formats. */ | |
503 | ||
504 | /* This is probably a mistake. FIXME. Why can't the HP's use an ordinary | |
505 | file format name with an -hppa suffix? */ | |
506 | static struct sym_fns pa_sym_fns = | |
507 | { | |
003ccb90 KR |
508 | "som", /* sym_name: name or name prefix of BFD target type */ |
509 | 3, /* sym_namelen: number of significant sym_name chars */ | |
684a832f SG |
510 | pa_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
511 | pa_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
512 | pa_symfile_read, /* sym_read: read a symbol file into symtab */ | |
513 | pa_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
514 | pa_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ | |
515 | NULL /* next: pointer to next struct sym_fns */ | |
516 | }; | |
517 | ||
518 | void | |
519 | _initialize_paread () | |
520 | { | |
521 | add_symtab_fns (&pa_sym_fns); | |
522 | } |