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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 | ||
21 | /************************************************************************ | |
22 | * * | |
23 | * NOTICE * | |
24 | * * | |
25 | * This file is still under construction. When it is complete, this * | |
26 | * notice will be removed. Until then, direct any questions or changes * | |
27 | * to Fred Fish at Cygnus Support (fnf@cygnus.com) * | |
28 | * * | |
29 | * FIXME Still needs support for shared libraries. * | |
30 | * FIXME Still needs support for core files. * | |
31 | * FIXME The ".debug" and ".line" section names are hardwired. * | |
32 | * * | |
33 | ************************************************************************/ | |
34 | ||
35 | #include "defs.h" | |
36 | #include "bfd.h" | |
37 | #include "libbfd.h" | |
38 | #include "libhppa.h" | |
39 | #include <syms.h> | |
40 | #include "symtab.h" | |
41 | #include "symfile.h" | |
42 | #include "objfiles.h" | |
43 | #include "buildsym.h" | |
44 | #include "gdb-stabs.h" | |
45 | #include "complaints.h" | |
46 | #include <string.h> | |
47 | #include "demangle.h" | |
48 | #include <sys/file.h> | |
49 | ||
50 | /* Various things we might complain about... */ | |
51 | ||
52 | static void | |
53 | pa_symfile_init PARAMS ((struct objfile *)); | |
54 | ||
55 | static void | |
56 | pa_new_init PARAMS ((struct objfile *)); | |
57 | ||
58 | static void | |
59 | pa_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); | |
60 | ||
61 | static void | |
62 | pa_symfile_finish PARAMS ((struct objfile *)); | |
63 | ||
64 | static void | |
65 | pa_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); | |
66 | ||
67 | static void | |
68 | free_painfo PARAMS ((PTR)); | |
69 | ||
70 | static struct section_offsets * | |
71 | pa_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
72 | ||
73 | static void | |
74 | record_minimal_symbol PARAMS ((char *, CORE_ADDR, | |
75 | enum minimal_symbol_type, | |
76 | struct objfile *)); | |
77 | ||
78 | static void | |
79 | record_minimal_symbol (name, address, ms_type, objfile) | |
80 | char *name; | |
81 | CORE_ADDR address; | |
82 | enum minimal_symbol_type ms_type; | |
83 | struct objfile *objfile; | |
84 | { | |
85 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
86 | prim_record_minimal_symbol (name, address, ms_type); | |
87 | } | |
88 | ||
89 | /* | |
90 | ||
91 | LOCAL FUNCTION | |
92 | ||
93 | pa_symtab_read -- read the symbol table of a PA file | |
94 | ||
95 | SYNOPSIS | |
96 | ||
97 | void pa_symtab_read (bfd *abfd, CORE_ADDR addr, | |
98 | struct objfile *objfile) | |
99 | ||
100 | DESCRIPTION | |
101 | ||
102 | Given an open bfd, a base address to relocate symbols to, and a | |
103 | flag that specifies whether or not this bfd is for an executable | |
104 | or not (may be shared library for example), add all the global | |
105 | function and data symbols to the minimal symbol table. | |
106 | */ | |
107 | ||
108 | static void | |
109 | pa_symtab_read (abfd, addr, objfile) | |
110 | bfd *abfd; | |
111 | CORE_ADDR addr; | |
112 | struct objfile *objfile; | |
113 | { | |
114 | unsigned int number_of_symbols; | |
115 | unsigned int i; | |
116 | int val; | |
117 | char *stringtab; | |
118 | struct symbol_dictionary_record *buf, *bufp; | |
119 | ||
120 | number_of_symbols = obj_hp_sym_count (abfd); | |
121 | ||
122 | buf = alloca (obj_hp_symbol_entry_size (abfd) * number_of_symbols); | |
123 | bfd_seek (abfd, obj_hp_sym_filepos (abfd), L_SET); | |
124 | val = bfd_read (buf, obj_hp_symbol_entry_size (abfd) * number_of_symbols, | |
125 | 1, abfd); | |
126 | if (val != obj_hp_symbol_entry_size (abfd) * number_of_symbols) | |
127 | error ("Couldn't read symbol dictionary!"); | |
128 | ||
129 | stringtab = alloca (obj_hp_stringtab_size (abfd)); | |
130 | bfd_seek (abfd, obj_hp_str_filepos (abfd), L_SET); | |
131 | val = bfd_read (stringtab, obj_hp_stringtab_size (abfd), 1, abfd); | |
132 | if (val != obj_hp_stringtab_size (abfd)) | |
133 | error ("Can't read in HP string table."); | |
134 | ||
135 | for (i = 0, bufp = buf; i < number_of_symbols; i++, bufp++) | |
136 | { | |
137 | enum minimal_symbol_type ms_type; | |
138 | ||
139 | QUIT; | |
140 | ||
141 | if (bufp->symbol_scope != SS_UNIVERSAL) | |
142 | continue; | |
143 | ||
144 | switch (bufp->symbol_type) | |
145 | { | |
146 | case ST_SYM_EXT: | |
147 | case ST_ARG_EXT: | |
148 | continue; | |
149 | case ST_CODE: | |
150 | case ST_PRI_PROG: | |
151 | case ST_SEC_PROG: | |
152 | case ST_ENTRY: | |
153 | case ST_MILLICODE: | |
154 | ms_type = mst_text; | |
155 | bufp->symbol_value &= ~0x3; /* clear out permission bits */ | |
156 | break; | |
157 | case ST_DATA: | |
158 | ms_type = mst_data; | |
159 | break; | |
160 | default: | |
161 | continue; | |
162 | } | |
163 | ||
164 | if (bufp->name.n_strx > obj_hp_stringtab_size (abfd)) | |
165 | error ("Invalid symbol data; bad HP string table offset: %d", | |
166 | bufp->name.n_strx); | |
167 | ||
168 | record_minimal_symbol (bufp->name.n_strx + stringtab, | |
169 | bufp->symbol_value, ms_type, | |
170 | objfile); | |
171 | } | |
172 | ||
173 | install_minimal_symbols (objfile); | |
174 | } | |
175 | ||
176 | /* Scan and build partial symbols for a symbol file. | |
177 | We have been initialized by a call to pa_symfile_init, which | |
178 | currently does nothing. | |
179 | ||
180 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
181 | in each section. This is ignored, as it isn't needed for the PA. | |
182 | ||
183 | MAINLINE is true if we are reading the main symbol | |
184 | table (as opposed to a shared lib or dynamically loaded file). | |
185 | ||
186 | This function only does the minimum work necessary for letting the | |
187 | user "name" things symbolically; it does not read the entire symtab. | |
188 | Instead, it reads the external and static symbols and puts them in partial | |
189 | symbol tables. When more extensive information is requested of a | |
190 | file, the corresponding partial symbol table is mutated into a full | |
191 | fledged symbol table by going back and reading the symbols | |
192 | for real. | |
193 | ||
194 | We look for sections with specific names, to tell us what debug | |
195 | format to look for: FIXME!!! | |
196 | ||
197 | pastab_build_psymtabs() handles STABS symbols. | |
198 | ||
199 | Note that PA files have a "minimal" symbol table, which is vaguely | |
200 | reminiscent of a COFF symbol table, but has only the minimal information | |
201 | necessary for linking. We process this also, and use the information to | |
202 | build gdb's minimal symbol table. This gives us some minimal debugging | |
203 | capability even for files compiled without -g. */ | |
204 | ||
205 | static void | |
206 | pa_symfile_read (objfile, section_offsets, mainline) | |
207 | struct objfile *objfile; | |
208 | struct section_offsets *section_offsets; | |
209 | int mainline; | |
210 | { | |
211 | bfd *abfd = objfile->obfd; | |
212 | struct cleanup *back_to; | |
213 | CORE_ADDR offset; | |
214 | ||
215 | init_minimal_symbol_collection (); | |
216 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
217 | ||
218 | make_cleanup (free_painfo, (PTR) objfile); | |
219 | ||
220 | /* Process the normal PA symbol table first. */ | |
221 | ||
222 | /* FIXME, should take a section_offsets param, not just an offset. */ | |
223 | ||
224 | offset = ANOFFSET (section_offsets, 0); | |
225 | pa_symtab_read (abfd, offset, objfile); | |
226 | ||
227 | /* Now process debugging information, which is contained in | |
228 | special PA sections. */ | |
229 | ||
230 | pastab_build_psymtabs (objfile, section_offsets, mainline); | |
231 | ||
232 | do_cleanups (back_to); | |
233 | } | |
234 | ||
235 | /* This cleans up the objfile's sym_private pointer, and the chain of | |
236 | stab_section_info's, that might be dangling from it. */ | |
237 | ||
238 | static void | |
239 | free_painfo (objp) | |
240 | PTR objp; | |
241 | { | |
242 | struct objfile *objfile = (struct objfile *)objp; | |
243 | struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *) | |
244 | objfile->sym_private; | |
245 | struct stab_section_info *ssi, *nssi; | |
246 | ||
247 | ssi = dbxinfo->stab_section_info; | |
248 | while (ssi) | |
249 | { | |
250 | nssi = ssi->next; | |
251 | mfree (objfile->md, ssi); | |
252 | ssi = nssi; | |
253 | } | |
254 | ||
255 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ | |
256 | } | |
257 | ||
258 | /* Initialize anything that needs initializing when a completely new symbol | |
259 | file is specified (not just adding some symbols from another file, e.g. a | |
260 | shared library). | |
261 | ||
262 | We reinitialize buildsym, since we may be reading stabs from a PA file. */ | |
263 | ||
264 | static void | |
265 | pa_new_init (ignore) | |
266 | struct objfile *ignore; | |
267 | { | |
268 | stabsread_new_init (); | |
269 | buildsym_new_init (); | |
270 | } | |
271 | ||
272 | /* Perform any local cleanups required when we are done with a particular | |
273 | objfile. I.E, we are in the process of discarding all symbol information | |
274 | for an objfile, freeing up all memory held for it, and unlinking the | |
275 | objfile struct from the global list of known objfiles. */ | |
276 | ||
277 | static void | |
278 | pa_symfile_finish (objfile) | |
279 | struct objfile *objfile; | |
280 | { | |
281 | if (objfile -> sym_private != NULL) | |
282 | { | |
283 | mfree (objfile -> md, objfile -> sym_private); | |
284 | } | |
285 | } | |
286 | ||
287 | #if 0 | |
288 | ||
289 | ||
290 | ||
291 | ||
292 | ||
293 | mainline, | |
294 | stabsect->filepos, /* .stab offset */ | |
295 | bfd_get_section_size_before_reloc (stabsect), /* .stab size */ | |
296 | stabstringsect->filepos, /* .stabstr offset */ | |
297 | bfd_get_section_size_before_reloc (stabstringsect), /* .stabstr size */ | |
298 | obj_dbx_symbol_entry_size (abfd)); | |
299 | ||
300 | ||
301 | #endif | |
302 | ||
303 | /* PA specific initialization routine for reading symbols. | |
304 | ||
305 | It is passed a pointer to a struct sym_fns which contains, among other | |
306 | things, the BFD for the file whose symbols are being read, and a slot for | |
307 | a pointer to "private data" which we can fill with goodies. | |
308 | ||
309 | This routine is almost a complete ripoff of dbx_symfile_init. The | |
310 | common parts of these routines should be extracted and used instead of | |
311 | duplicating this code. FIXME. */ | |
312 | ||
313 | static void | |
314 | pa_symfile_init (objfile) | |
315 | struct objfile *objfile; | |
316 | { | |
317 | int val; | |
318 | bfd *sym_bfd = objfile->obfd; | |
319 | char *name = bfd_get_filename (sym_bfd); | |
320 | ||
321 | /* Allocate struct to keep track of the symfile */ | |
322 | objfile->sym_private = (PTR) | |
323 | xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); | |
324 | ||
325 | /* FIXME POKING INSIDE BFD DATA STRUCTURES */ | |
326 | #define STRING_TABLE_OFFSET (obj_dbx_str_filepos (sym_bfd)) | |
327 | #define SYMBOL_TABLE_OFFSET (obj_dbx_sym_filepos (sym_bfd)) | |
328 | ||
329 | /* FIXME POKING INSIDE BFD DATA STRUCTURES */ | |
330 | ||
331 | DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL; | |
332 | DBX_TEXT_SECT (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); | |
333 | if (!DBX_TEXT_SECT (objfile)) | |
334 | error ("Can't find .text section in symbol file"); | |
335 | ||
336 | DBX_SYMBOL_SIZE (objfile) = obj_dbx_symbol_entry_size (sym_bfd); | |
337 | DBX_SYMCOUNT (objfile) = obj_dbx_sym_count (sym_bfd); | |
338 | DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; | |
339 | ||
340 | /* Read the string table and stash it away in the psymbol_obstack. It is | |
341 | only needed as long as we need to expand psymbols into full symbols, | |
342 | so when we blow away the psymbol the string table goes away as well. | |
343 | Note that gdb used to use the results of attempting to malloc the | |
344 | string table, based on the size it read, as a form of sanity check | |
345 | for botched byte swapping, on the theory that a byte swapped string | |
346 | table size would be so totally bogus that the malloc would fail. Now | |
347 | that we put in on the psymbol_obstack, we can't do this since gdb gets | |
348 | a fatal error (out of virtual memory) if the size is bogus. We can | |
349 | however at least check to see if the size is zero or some negative | |
350 | value. */ | |
351 | ||
352 | DBX_STRINGTAB_SIZE (objfile) = obj_dbx_stringtab_size (sym_bfd); | |
353 | ||
354 | if (DBX_SYMCOUNT (objfile) == 0 | |
355 | || DBX_STRINGTAB_SIZE (objfile) == 0) | |
356 | return; | |
357 | ||
358 | if (DBX_STRINGTAB_SIZE (objfile) <= 0 | |
359 | || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) | |
360 | error ("ridiculous string table size (%d bytes).", | |
361 | DBX_STRINGTAB_SIZE (objfile)); | |
362 | ||
363 | DBX_STRINGTAB (objfile) = | |
364 | (char *) obstack_alloc (&objfile -> psymbol_obstack, | |
365 | DBX_STRINGTAB_SIZE (objfile)); | |
366 | ||
367 | /* Now read in the string table in one big gulp. */ | |
368 | ||
369 | val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, L_SET); | |
370 | if (val < 0) | |
371 | perror_with_name (name); | |
372 | val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1, | |
373 | sym_bfd); | |
374 | if (val != DBX_STRINGTAB_SIZE (objfile)) | |
375 | perror_with_name (name); | |
376 | } | |
377 | ||
378 | /* PA specific parsing routine for section offsets. | |
379 | ||
380 | Plain and simple for now. */ | |
381 | ||
382 | static struct section_offsets * | |
383 | pa_symfile_offsets (objfile, addr) | |
384 | struct objfile *objfile; | |
385 | CORE_ADDR addr; | |
386 | { | |
387 | struct section_offsets *section_offsets; | |
388 | int i; | |
389 | ||
390 | section_offsets = (struct section_offsets *) | |
391 | obstack_alloc (&objfile -> psymbol_obstack, | |
392 | sizeof (struct section_offsets) + | |
393 | sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
394 | ||
395 | for (i = 0; i < SECT_OFF_MAX; i++) | |
396 | ANOFFSET (section_offsets, i) = addr; | |
397 | ||
398 | return section_offsets; | |
399 | } | |
400 | \f | |
401 | /* Register that we are able to handle PA object file formats. */ | |
402 | ||
403 | /* This is probably a mistake. FIXME. Why can't the HP's use an ordinary | |
404 | file format name with an -hppa suffix? */ | |
405 | static struct sym_fns pa_sym_fns = | |
406 | { | |
407 | "hppa", /* sym_name: name or name prefix of BFD target type */ | |
408 | 4, /* sym_namelen: number of significant sym_name chars */ | |
409 | pa_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
410 | pa_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
411 | pa_symfile_read, /* sym_read: read a symbol file into symtab */ | |
412 | pa_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
413 | pa_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ | |
414 | NULL /* next: pointer to next struct sym_fns */ | |
415 | }; | |
416 | ||
417 | void | |
418 | _initialize_paread () | |
419 | { | |
420 | add_symtab_fns (&pa_sym_fns); | |
421 | } |