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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" | |
23 | #include <time.h> /* For time_t in libbfd.h. */ | |
24 | #include <sys/types.h> /* For time_t, if not in time.h. */ | |
25 | #include "libbfd.h" | |
26 | #include "som.h" | |
27 | #include "libhppa.h" | |
28 | #include <syms.h> | |
29 | #include "symtab.h" | |
30 | #include "symfile.h" | |
31 | #include "objfiles.h" | |
32 | #include "buildsym.h" | |
33 | #include "stabsread.h" | |
34 | #include "gdb-stabs.h" | |
35 | #include "complaints.h" | |
36 | #include <string.h> | |
37 | #include "demangle.h" | |
38 | #include <sys/file.h> | |
39 | ||
40 | /* Size of n_value and n_strx fields in a stab symbol. */ | |
41 | #define BYTES_IN_WORD 4 | |
42 | ||
6a86fa48 | 43 | #if 0 |
bfe2f12b | 44 | #include "aout/aout64.h" |
6a86fa48 | 45 | #endif |
bfe2f12b JL |
46 | |
47 | /* Various things we might complain about... */ | |
48 | ||
49 | static void | |
6a86fa48 | 50 | som_symfile_init PARAMS ((struct objfile *)); |
bfe2f12b JL |
51 | |
52 | static void | |
53 | som_new_init PARAMS ((struct objfile *)); | |
54 | ||
55 | static void | |
56 | som_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); | |
57 | ||
58 | static void | |
59 | som_symfile_finish PARAMS ((struct objfile *)); | |
60 | ||
61 | static void | |
62 | som_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *)); | |
63 | ||
bfe2f12b JL |
64 | static struct section_offsets * |
65 | som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR)); | |
66 | ||
67 | static void | |
68 | record_minimal_symbol PARAMS ((char *, CORE_ADDR, | |
69 | enum minimal_symbol_type, | |
70 | struct objfile *)); | |
71 | ||
72 | static void | |
73 | record_minimal_symbol (name, address, ms_type, objfile) | |
74 | char *name; | |
75 | CORE_ADDR address; | |
76 | enum minimal_symbol_type ms_type; | |
77 | struct objfile *objfile; | |
78 | { | |
79 | name = obsavestring (name, strlen (name), &objfile -> symbol_obstack); | |
80 | prim_record_minimal_symbol (name, address, ms_type, objfile); | |
81 | } | |
82 | ||
83 | /* | |
84 | ||
85 | LOCAL FUNCTION | |
86 | ||
87 | som_symtab_read -- read the symbol table of a SOM file | |
88 | ||
89 | SYNOPSIS | |
90 | ||
91 | void som_symtab_read (bfd *abfd, CORE_ADDR addr, | |
92 | struct objfile *objfile) | |
93 | ||
94 | DESCRIPTION | |
95 | ||
96 | Given an open bfd, a base address to relocate symbols to, and a | |
97 | flag that specifies whether or not this bfd is for an executable | |
98 | or not (may be shared library for example), add all the global | |
99 | function and data symbols to the minimal symbol table. | |
100 | */ | |
101 | ||
102 | static void | |
103 | som_symtab_read (abfd, addr, objfile) | |
104 | bfd *abfd; | |
105 | CORE_ADDR addr; | |
106 | struct objfile *objfile; | |
107 | { | |
108 | unsigned int number_of_symbols; | |
bfe2f12b JL |
109 | int val, dynamic; |
110 | char *stringtab; | |
111 | asection *shlib_info; | |
112 | struct symbol_dictionary_record *buf, *bufp, *endbufp; | |
113 | char *symname; | |
114 | CONST int symsize = sizeof (struct symbol_dictionary_record); | |
115 | ||
116 | number_of_symbols = bfd_get_symcount (abfd); | |
117 | ||
118 | buf = alloca (symsize * number_of_symbols); | |
119 | bfd_seek (abfd, obj_som_sym_filepos (abfd), L_SET); | |
120 | val = bfd_read (buf, symsize * number_of_symbols, 1, abfd); | |
121 | if (val != symsize * number_of_symbols) | |
122 | error ("Couldn't read symbol dictionary!"); | |
123 | ||
124 | stringtab = alloca (obj_som_stringtab_size (abfd)); | |
125 | bfd_seek (abfd, obj_som_str_filepos (abfd), L_SET); | |
126 | val = bfd_read (stringtab, obj_som_stringtab_size (abfd), 1, abfd); | |
127 | if (val != obj_som_stringtab_size (abfd)) | |
128 | error ("Can't read in HP string table."); | |
129 | ||
130 | /* We need to determine if objfile is a dynamic executable (so we | |
131 | can do the right thing for ST_ENTRY vs ST_CODE symbols). | |
132 | ||
133 | There's nothing in the header which easily allows us to do | |
134 | this. The only reliable way I know of is to check for the | |
135 | existance of a $SHLIB_INFO$ section with a non-zero size. */ | |
136 | shlib_info = bfd_get_section_by_name (objfile->obfd, "$SHLIB_INFO$"); | |
137 | if (shlib_info) | |
138 | dynamic = (bfd_section_size (objfile->obfd, shlib_info) != 0); | |
139 | else | |
140 | dynamic = 0; | |
141 | ||
142 | endbufp = buf + number_of_symbols; | |
143 | for (bufp = buf; bufp < endbufp; ++bufp) | |
144 | { | |
145 | enum minimal_symbol_type ms_type; | |
146 | ||
147 | QUIT; | |
148 | ||
149 | switch (bufp->symbol_scope) | |
150 | { | |
151 | case SS_UNIVERSAL: | |
152 | case SS_EXTERNAL: | |
153 | switch (bufp->symbol_type) | |
154 | { | |
155 | case ST_SYM_EXT: | |
156 | case ST_ARG_EXT: | |
157 | continue; | |
158 | ||
159 | case ST_CODE: | |
160 | case ST_PRI_PROG: | |
161 | case ST_SEC_PROG: | |
162 | case ST_MILLICODE: | |
163 | symname = bufp->name.n_strx + stringtab; | |
164 | ms_type = mst_text; | |
165 | #ifdef SMASH_TEXT_ADDRESS | |
166 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
167 | #endif | |
168 | break; | |
169 | ||
170 | case ST_ENTRY: | |
171 | symname = bufp->name.n_strx + stringtab; | |
172 | /* For a dynamic executable, ST_ENTRY symbols are | |
173 | the stubs, while the ST_CODE symbol is the real | |
174 | function. */ | |
175 | if (dynamic) | |
176 | ms_type = mst_solib_trampoline; | |
177 | else | |
178 | ms_type = mst_text; | |
179 | #ifdef SMASH_TEXT_ADDRESS | |
180 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
181 | #endif | |
182 | break; | |
183 | ||
184 | case ST_STUB: | |
185 | symname = bufp->name.n_strx + stringtab; | |
186 | ms_type = mst_solib_trampoline; | |
187 | #ifdef SMASH_TEXT_ADDRESS | |
188 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
189 | #endif | |
190 | break; | |
191 | ||
192 | case ST_DATA: | |
193 | symname = bufp->name.n_strx + stringtab; | |
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; | |
215 | #ifdef SMASH_TEXT_ADDRESS | |
216 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
217 | #endif | |
218 | ||
219 | check_strange_names: | |
220 | /* Utah GCC 2.5, FSF GCC 2.6 and later generate correct local | |
221 | label prefixes for stabs, constant data, etc. So we need | |
222 | only filter out L$ symbols which are left in due to | |
223 | limitations in how GAS generates SOM relocations. | |
224 | ||
225 | When linking in the HPUX C-library the HP linker has | |
226 | the nasty habit of placing section symbols from the literal | |
227 | subspaces in the middle of the program's text. Filter | |
228 | those out as best we can. Check for first and last character | |
229 | being '$'. */ | |
230 | if ((symname[0] == 'L' && symname[1] == '$') | |
231 | || (symname[0] == '$' && symname[strlen(symname) - 1] == '$')) | |
232 | continue; | |
233 | break; | |
234 | ||
235 | case ST_PRI_PROG: | |
236 | case ST_SEC_PROG: | |
237 | case ST_MILLICODE: | |
238 | symname = bufp->name.n_strx + stringtab; | |
239 | ms_type = mst_file_text; | |
240 | #ifdef SMASH_TEXT_ADDRESS | |
241 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
242 | #endif | |
243 | break; | |
244 | ||
245 | case ST_ENTRY: | |
246 | symname = bufp->name.n_strx + stringtab; | |
247 | /* For a dynamic executable, ST_ENTRY symbols are | |
248 | the stubs, while the ST_CODE symbol is the real | |
249 | function. */ | |
250 | if (dynamic) | |
251 | ms_type = mst_solib_trampoline; | |
252 | else | |
253 | ms_type = mst_file_text; | |
254 | #ifdef SMASH_TEXT_ADDRESS | |
255 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
256 | #endif | |
257 | break; | |
258 | ||
259 | case ST_STUB: | |
260 | symname = bufp->name.n_strx + stringtab; | |
261 | ms_type = mst_solib_trampoline; | |
262 | #ifdef SMASH_TEXT_ADDRESS | |
263 | SMASH_TEXT_ADDRESS (bufp->symbol_value); | |
264 | #endif | |
265 | break; | |
266 | ||
267 | ||
268 | case ST_DATA: | |
269 | symname = bufp->name.n_strx + stringtab; | |
270 | ms_type = mst_file_data; | |
271 | goto check_strange_names; | |
272 | ||
273 | default: | |
274 | continue; | |
275 | } | |
276 | break; | |
277 | ||
278 | default: | |
279 | continue; | |
280 | } | |
281 | ||
282 | if (bufp->name.n_strx > obj_som_stringtab_size (abfd)) | |
283 | error ("Invalid symbol data; bad HP string table offset: %d", | |
284 | bufp->name.n_strx); | |
285 | ||
286 | record_minimal_symbol (symname, | |
287 | bufp->symbol_value, ms_type, | |
288 | objfile); | |
289 | } | |
bfe2f12b JL |
290 | } |
291 | ||
292 | /* Scan and build partial symbols for a symbol file. | |
293 | We have been initialized by a call to som_symfile_init, which | |
294 | currently does nothing. | |
295 | ||
296 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols | |
297 | in each section. This is ignored, as it isn't needed for SOM. | |
298 | ||
299 | MAINLINE is true if we are reading the main symbol | |
300 | table (as opposed to a shared lib or dynamically loaded file). | |
301 | ||
302 | This function only does the minimum work necessary for letting the | |
303 | user "name" things symbolically; it does not read the entire symtab. | |
304 | Instead, it reads the external and static symbols and puts them in partial | |
305 | symbol tables. When more extensive information is requested of a | |
306 | file, the corresponding partial symbol table is mutated into a full | |
307 | fledged symbol table by going back and reading the symbols | |
308 | for real. | |
309 | ||
310 | We look for sections with specific names, to tell us what debug | |
311 | format to look for: FIXME!!! | |
312 | ||
313 | somstab_build_psymtabs() handles STABS symbols. | |
314 | ||
315 | Note that SOM files have a "minimal" symbol table, which is vaguely | |
316 | reminiscent of a COFF symbol table, but has only the minimal information | |
317 | necessary for linking. We process this also, and use the information to | |
318 | build gdb's minimal symbol table. This gives us some minimal debugging | |
319 | capability even for files compiled without -g. */ | |
320 | ||
321 | static void | |
322 | som_symfile_read (objfile, section_offsets, mainline) | |
323 | struct objfile *objfile; | |
324 | struct section_offsets *section_offsets; | |
325 | int mainline; | |
326 | { | |
327 | bfd *abfd = objfile->obfd; | |
328 | struct cleanup *back_to; | |
329 | CORE_ADDR offset; | |
330 | ||
331 | init_minimal_symbol_collection (); | |
332 | back_to = make_cleanup (discard_minimal_symbols, 0); | |
333 | ||
bfe2f12b JL |
334 | /* FIXME, should take a section_offsets param, not just an offset. */ |
335 | ||
336 | offset = ANOFFSET (section_offsets, 0); | |
bfe2f12b | 337 | |
6a86fa48 | 338 | /* Process the normal SOM symbol table first. */ |
bfe2f12b | 339 | |
6a86fa48 | 340 | som_symtab_read (abfd, offset, objfile); |
bfe2f12b | 341 | |
6a86fa48 JL |
342 | /* Now read information from the debugging sections. */ |
343 | stabsect_build_psymtabs (objfile, section_offsets, mainline, | |
344 | "$GDB_SYMBOLS$", "$GDB_STRINGS$", "$TEXT$"); | |
bfe2f12b | 345 | |
6a86fa48 JL |
346 | /* Install any minimal symbols that have been collected as the current |
347 | minimal symbols for this objfile. */ | |
348 | install_minimal_symbols (objfile); | |
bfe2f12b | 349 | |
6a86fa48 | 350 | do_cleanups (back_to); |
bfe2f12b JL |
351 | } |
352 | ||
353 | /* Initialize anything that needs initializing when a completely new symbol | |
354 | file is specified (not just adding some symbols from another file, e.g. a | |
355 | shared library). | |
356 | ||
357 | We reinitialize buildsym, since we may be reading stabs from a SOM file. */ | |
358 | ||
359 | static void | |
360 | som_new_init (ignore) | |
361 | struct objfile *ignore; | |
362 | { | |
363 | stabsread_new_init (); | |
364 | buildsym_new_init (); | |
365 | } | |
366 | ||
367 | /* Perform any local cleanups required when we are done with a particular | |
368 | objfile. I.E, we are in the process of discarding all symbol information | |
369 | for an objfile, freeing up all memory held for it, and unlinking the | |
370 | objfile struct from the global list of known objfiles. */ | |
371 | ||
372 | static void | |
373 | som_symfile_finish (objfile) | |
374 | struct objfile *objfile; | |
375 | { | |
376 | if (objfile -> sym_stab_info != NULL) | |
377 | { | |
378 | mfree (objfile -> md, objfile -> sym_stab_info); | |
379 | } | |
380 | } | |
381 | ||
382 | /* SOM specific initialization routine for reading symbols. | |
383 | ||
6a86fa48 | 384 | Nothing SOM specific left to do anymore. */ |
bfe2f12b | 385 | static void |
6a86fa48 JL |
386 | som_symfile_init (ignore) |
387 | struct objfile *ignore; | |
bfe2f12b | 388 | { |
bfe2f12b JL |
389 | } |
390 | ||
391 | /* SOM specific parsing routine for section offsets. | |
392 | ||
393 | Plain and simple for now. */ | |
394 | ||
395 | static struct section_offsets * | |
396 | som_symfile_offsets (objfile, addr) | |
397 | struct objfile *objfile; | |
398 | CORE_ADDR addr; | |
399 | { | |
400 | struct section_offsets *section_offsets; | |
401 | int i; | |
402 | ||
403 | objfile->num_sections = SECT_OFF_MAX; | |
404 | section_offsets = (struct section_offsets *) | |
405 | obstack_alloc (&objfile -> psymbol_obstack, | |
406 | sizeof (struct section_offsets) | |
407 | + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1)); | |
408 | ||
409 | for (i = 0; i < SECT_OFF_MAX; i++) | |
410 | ANOFFSET (section_offsets, i) = addr; | |
411 | ||
412 | return section_offsets; | |
413 | } | |
414 | \f | |
415 | /* Register that we are able to handle SOM object file formats. */ | |
416 | ||
417 | static struct sym_fns som_sym_fns = | |
418 | { | |
419 | bfd_target_som_flavour, | |
420 | som_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
421 | som_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
422 | som_symfile_read, /* sym_read: read a symbol file into symtab */ | |
423 | som_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
424 | som_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ | |
425 | NULL /* next: pointer to next struct sym_fns */ | |
426 | }; | |
427 | ||
428 | void | |
429 | _initialize_somread () | |
430 | { | |
431 | add_symtab_fns (&som_sym_fns); | |
432 | } |