Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Read a symbol table in MIPS' format (Third-Eye). |
b6ba6518 | 2 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
9ab9195f | 3 | 1998, 1999, 2000, 2001, 2003, 2004 |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | Contributed by Alessandro Forin (af@cs.cmu.edu) at CMU. Major work | |
6 | by Per Bothner, John Gilmore and Ian Lance Taylor at Cygnus Support. | |
7 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | /* Read symbols from an ECOFF file. Most of the work is done in | |
26 | mdebugread.c. */ | |
27 | ||
28 | #include "defs.h" | |
29 | #include "gdb_string.h" | |
30 | #include "bfd.h" | |
31 | #include "symtab.h" | |
c906108c SS |
32 | #include "objfiles.h" |
33 | #include "buildsym.h" | |
34 | #include "stabsread.h" | |
c906108c SS |
35 | |
36 | #include "coff/sym.h" | |
37 | #include "coff/internal.h" | |
38 | #include "coff/ecoff.h" | |
39 | #include "libcoff.h" /* Private BFD COFF information. */ | |
40 | #include "libecoff.h" /* Private BFD ECOFF information. */ | |
41 | #include "elf/common.h" | |
42 | #include "elf/mips.h" | |
43 | ||
a14ed312 | 44 | extern void _initialize_mipsread (void); |
392a587b | 45 | |
a14ed312 | 46 | static void mipscoff_new_init (struct objfile *); |
c906108c | 47 | |
a14ed312 | 48 | static void mipscoff_symfile_init (struct objfile *); |
c906108c | 49 | |
a14ed312 | 50 | static void mipscoff_symfile_read (struct objfile *, int); |
c906108c | 51 | |
a14ed312 | 52 | static void mipscoff_symfile_finish (struct objfile *); |
c906108c SS |
53 | |
54 | static void | |
a14ed312 KB |
55 | read_alphacoff_dynamic_symtab (struct section_offsets *, |
56 | struct objfile *objfile); | |
c906108c SS |
57 | |
58 | /* Initialize anything that needs initializing when a completely new | |
59 | symbol file is specified (not just adding some symbols from another | |
60 | file, e.g. a shared library). */ | |
61 | ||
62 | extern CORE_ADDR sigtramp_address; | |
63 | ||
64 | static void | |
fba45db2 | 65 | mipscoff_new_init (struct objfile *ignore) |
c906108c SS |
66 | { |
67 | sigtramp_address = 0; | |
68 | stabsread_new_init (); | |
69 | buildsym_new_init (); | |
70 | } | |
71 | ||
72 | /* Initialize to read a symbol file (nothing to do). */ | |
73 | ||
74 | static void | |
fba45db2 | 75 | mipscoff_symfile_init (struct objfile *objfile) |
c906108c SS |
76 | { |
77 | } | |
78 | ||
79 | /* Read a symbol file from a file. */ | |
80 | ||
81 | static void | |
fba45db2 | 82 | mipscoff_symfile_read (struct objfile *objfile, int mainline) |
c906108c SS |
83 | { |
84 | bfd *abfd = objfile->obfd; | |
c5aa993b | 85 | struct cleanup *back_to; |
c906108c SS |
86 | |
87 | init_minimal_symbol_collection (); | |
56e290f4 | 88 | back_to = make_cleanup_discard_minimal_symbols (); |
c906108c SS |
89 | |
90 | /* Now that the executable file is positioned at symbol table, | |
91 | process it and define symbols accordingly. */ | |
92 | ||
93 | if (!((*ecoff_backend (abfd)->debug_swap.read_debug_info) | |
94 | (abfd, (asection *) NULL, &ecoff_data (abfd)->debug_info))) | |
95 | error ("Error reading symbol table: %s", bfd_errmsg (bfd_get_error ())); | |
96 | ||
97 | mdebug_build_psymtabs (objfile, &ecoff_backend (abfd)->debug_swap, | |
d4f3574e | 98 | &ecoff_data (abfd)->debug_info); |
c906108c SS |
99 | |
100 | /* Add alpha coff dynamic symbols. */ | |
101 | ||
96baa820 | 102 | read_alphacoff_dynamic_symtab (objfile->section_offsets, objfile); |
c906108c SS |
103 | |
104 | /* Install any minimal symbols that have been collected as the current | |
105 | minimal symbols for this objfile. */ | |
106 | ||
107 | install_minimal_symbols (objfile); | |
108 | ||
109 | /* If the entry_file bounds are still unknown after processing the | |
110 | partial symbols, then try to set them from the minimal symbols | |
111 | surrounding the entry_point. */ | |
112 | ||
113 | if (mainline | |
114 | && objfile->ei.entry_point != INVALID_ENTRY_POINT | |
627b3ba2 | 115 | && objfile->ei.deprecated_entry_file_lowpc == INVALID_ENTRY_LOWPC) |
c906108c SS |
116 | { |
117 | struct minimal_symbol *m; | |
118 | ||
119 | m = lookup_minimal_symbol_by_pc (objfile->ei.entry_point); | |
22abf04a | 120 | if (m && DEPRECATED_SYMBOL_NAME (m + 1)) |
c906108c | 121 | { |
627b3ba2 AC |
122 | objfile->ei.deprecated_entry_file_lowpc = SYMBOL_VALUE_ADDRESS (m); |
123 | objfile->ei.deprecated_entry_file_highpc = SYMBOL_VALUE_ADDRESS (m + 1); | |
c906108c SS |
124 | } |
125 | } | |
126 | ||
127 | do_cleanups (back_to); | |
128 | } | |
129 | ||
130 | /* Perform any local cleanups required when we are done with a | |
131 | particular objfile. */ | |
132 | ||
133 | static void | |
fba45db2 | 134 | mipscoff_symfile_finish (struct objfile *objfile) |
c906108c SS |
135 | { |
136 | } | |
137 | ||
138 | /* Alpha OSF/1 encapsulates the dynamic symbols in ELF format in a | |
139 | standard coff section. The ELF format for the symbols differs from | |
140 | the format defined in elf/external.h. It seems that a normal ELF 32 bit | |
141 | format is used, and the representation only changes because longs are | |
142 | 64 bit on the alpha. In addition, the handling of text/data section | |
143 | indices for symbols is different from the ELF ABI. | |
144 | As the BFD linker currently does not support dynamic linking on the alpha, | |
145 | there seems to be no reason to pollute BFD with another mixture of object | |
146 | file formats for now. */ | |
147 | ||
148 | /* Format of an alpha external ELF symbol. */ | |
149 | ||
c5aa993b JM |
150 | typedef struct |
151 | { | |
152 | unsigned char st_name[4]; /* Symbol name, index in string tbl */ | |
153 | unsigned char st_pad[4]; /* Pad to long word boundary */ | |
154 | unsigned char st_value[8]; /* Value of the symbol */ | |
155 | unsigned char st_size[4]; /* Associated symbol size */ | |
156 | unsigned char st_info[1]; /* Type and binding attributes */ | |
157 | unsigned char st_other[1]; /* No defined meaning, 0 */ | |
158 | unsigned char st_shndx[2]; /* Associated section index */ | |
159 | } | |
160 | Elfalpha_External_Sym; | |
c906108c SS |
161 | |
162 | /* Format of an alpha external ELF dynamic info structure. */ | |
163 | ||
c5aa993b JM |
164 | typedef struct |
165 | { | |
166 | unsigned char d_tag[4]; /* Tag */ | |
167 | unsigned char d_pad[4]; /* Pad to long word boundary */ | |
168 | union | |
169 | { | |
170 | unsigned char d_ptr[8]; /* Pointer value */ | |
171 | unsigned char d_val[4]; /* Integer value */ | |
172 | } | |
173 | d_un; | |
174 | } | |
175 | Elfalpha_External_Dyn; | |
c906108c SS |
176 | |
177 | /* Struct to obtain the section pointers for alpha dynamic symbol info. */ | |
178 | ||
c5aa993b JM |
179 | struct alphacoff_dynsecinfo |
180 | { | |
181 | asection *sym_sect; /* Section pointer for .dynsym section */ | |
182 | asection *str_sect; /* Section pointer for .dynstr section */ | |
183 | asection *dyninfo_sect; /* Section pointer for .dynamic section */ | |
184 | asection *got_sect; /* Section pointer for .got section */ | |
185 | }; | |
c906108c | 186 | |
c906108c SS |
187 | /* We are called once per section from read_alphacoff_dynamic_symtab. |
188 | We need to examine each section we are passed, check to see | |
189 | if it is something we are interested in processing, and | |
190 | if so, stash away some access information for the section. */ | |
191 | ||
192 | static void | |
12b9c64f | 193 | alphacoff_locate_sections (bfd *ignore_abfd, asection *sectp, void *sip) |
c906108c | 194 | { |
52f0bd74 | 195 | struct alphacoff_dynsecinfo *si; |
c906108c SS |
196 | |
197 | si = (struct alphacoff_dynsecinfo *) sip; | |
198 | ||
cb137aa5 | 199 | if (DEPRECATED_STREQ (sectp->name, ".dynsym")) |
c906108c SS |
200 | { |
201 | si->sym_sect = sectp; | |
202 | } | |
cb137aa5 | 203 | else if (DEPRECATED_STREQ (sectp->name, ".dynstr")) |
c906108c SS |
204 | { |
205 | si->str_sect = sectp; | |
206 | } | |
cb137aa5 | 207 | else if (DEPRECATED_STREQ (sectp->name, ".dynamic")) |
c906108c SS |
208 | { |
209 | si->dyninfo_sect = sectp; | |
210 | } | |
cb137aa5 | 211 | else if (DEPRECATED_STREQ (sectp->name, ".got")) |
c906108c SS |
212 | { |
213 | si->got_sect = sectp; | |
214 | } | |
215 | } | |
216 | ||
217 | /* Scan an alpha dynamic symbol table for symbols of interest and | |
218 | add them to the minimal symbol table. */ | |
219 | ||
220 | static void | |
fba45db2 KB |
221 | read_alphacoff_dynamic_symtab (struct section_offsets *section_offsets, |
222 | struct objfile *objfile) | |
c906108c SS |
223 | { |
224 | bfd *abfd = objfile->obfd; | |
225 | struct alphacoff_dynsecinfo si; | |
226 | char *sym_secptr; | |
227 | char *str_secptr; | |
228 | char *dyninfo_secptr; | |
229 | char *got_secptr; | |
230 | bfd_size_type sym_secsize; | |
231 | bfd_size_type str_secsize; | |
232 | bfd_size_type dyninfo_secsize; | |
233 | bfd_size_type got_secsize; | |
234 | int sym_count; | |
235 | int i; | |
236 | int stripped; | |
237 | Elfalpha_External_Sym *x_symp; | |
238 | char *dyninfo_p; | |
239 | char *dyninfo_end; | |
240 | int got_entry_size = 8; | |
241 | int dt_mips_local_gotno = -1; | |
242 | int dt_mips_gotsym = -1; | |
4b2e4867 | 243 | struct cleanup *cleanups; |
c906108c SS |
244 | |
245 | ||
246 | /* We currently only know how to handle alpha dynamic symbols. */ | |
247 | if (bfd_get_arch (abfd) != bfd_arch_alpha) | |
248 | return; | |
249 | ||
250 | /* Locate the dynamic symbols sections and read them in. */ | |
251 | memset ((char *) &si, 0, sizeof (si)); | |
12b9c64f | 252 | bfd_map_over_sections (abfd, alphacoff_locate_sections, (void *) & si); |
c906108c SS |
253 | if (si.sym_sect == NULL |
254 | || si.str_sect == NULL | |
255 | || si.dyninfo_sect == NULL | |
256 | || si.got_sect == NULL) | |
257 | return; | |
258 | ||
259 | sym_secsize = bfd_get_section_size_before_reloc (si.sym_sect); | |
260 | str_secsize = bfd_get_section_size_before_reloc (si.str_sect); | |
261 | dyninfo_secsize = bfd_get_section_size_before_reloc (si.dyninfo_sect); | |
262 | got_secsize = bfd_get_section_size_before_reloc (si.got_sect); | |
4b2e4867 PS |
263 | sym_secptr = xmalloc (sym_secsize); |
264 | cleanups = make_cleanup (free, sym_secptr); | |
265 | str_secptr = xmalloc (str_secsize); | |
266 | make_cleanup (free, str_secptr); | |
267 | dyninfo_secptr = xmalloc (dyninfo_secsize); | |
268 | make_cleanup (free, dyninfo_secptr); | |
269 | got_secptr = xmalloc (got_secsize); | |
270 | make_cleanup (free, got_secptr); | |
c906108c SS |
271 | |
272 | if (!bfd_get_section_contents (abfd, si.sym_sect, sym_secptr, | |
c5aa993b | 273 | (file_ptr) 0, sym_secsize)) |
c906108c SS |
274 | return; |
275 | if (!bfd_get_section_contents (abfd, si.str_sect, str_secptr, | |
c5aa993b | 276 | (file_ptr) 0, str_secsize)) |
c906108c SS |
277 | return; |
278 | if (!bfd_get_section_contents (abfd, si.dyninfo_sect, dyninfo_secptr, | |
c5aa993b | 279 | (file_ptr) 0, dyninfo_secsize)) |
c906108c SS |
280 | return; |
281 | if (!bfd_get_section_contents (abfd, si.got_sect, got_secptr, | |
c5aa993b | 282 | (file_ptr) 0, got_secsize)) |
c906108c SS |
283 | return; |
284 | ||
285 | /* Find the number of local GOT entries and the index for the | |
286 | the first dynamic symbol in the GOT. */ | |
287 | for (dyninfo_p = dyninfo_secptr, dyninfo_end = dyninfo_p + dyninfo_secsize; | |
288 | dyninfo_p < dyninfo_end; | |
289 | dyninfo_p += sizeof (Elfalpha_External_Dyn)) | |
290 | { | |
c5aa993b | 291 | Elfalpha_External_Dyn *x_dynp = (Elfalpha_External_Dyn *) dyninfo_p; |
c906108c SS |
292 | long dyn_tag; |
293 | ||
294 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_tag); | |
295 | if (dyn_tag == DT_NULL) | |
296 | break; | |
297 | else if (dyn_tag == DT_MIPS_LOCAL_GOTNO) | |
298 | { | |
299 | if (dt_mips_local_gotno < 0) | |
300 | dt_mips_local_gotno | |
301 | = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val); | |
302 | } | |
303 | else if (dyn_tag == DT_MIPS_GOTSYM) | |
304 | { | |
305 | if (dt_mips_gotsym < 0) | |
306 | dt_mips_gotsym | |
307 | = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp->d_un.d_val); | |
308 | } | |
309 | } | |
310 | if (dt_mips_local_gotno < 0 || dt_mips_gotsym < 0) | |
311 | return; | |
312 | ||
313 | /* Scan all dynamic symbols and enter them into the minimal symbol table | |
314 | if appropriate. */ | |
315 | sym_count = sym_secsize / sizeof (Elfalpha_External_Sym); | |
316 | stripped = (bfd_get_symcount (abfd) == 0); | |
317 | ||
318 | /* Skip first symbol, which is a null dummy. */ | |
319 | for (i = 1, x_symp = (Elfalpha_External_Sym *) sym_secptr + 1; | |
320 | i < sym_count; | |
321 | i++, x_symp++) | |
322 | { | |
323 | unsigned long strx; | |
324 | char *name; | |
325 | bfd_vma sym_value; | |
326 | unsigned char sym_info; | |
327 | unsigned int sym_shndx; | |
328 | int isglobal; | |
329 | enum minimal_symbol_type ms_type; | |
330 | ||
331 | strx = bfd_h_get_32 (abfd, (bfd_byte *) x_symp->st_name); | |
332 | if (strx >= str_secsize) | |
333 | continue; | |
334 | name = str_secptr + strx; | |
335 | if (*name == '\0' || *name == '.') | |
336 | continue; | |
337 | ||
338 | sym_value = bfd_h_get_64 (abfd, (bfd_byte *) x_symp->st_value); | |
339 | sym_info = bfd_h_get_8 (abfd, (bfd_byte *) x_symp->st_info); | |
340 | sym_shndx = bfd_h_get_16 (abfd, (bfd_byte *) x_symp->st_shndx); | |
341 | isglobal = (ELF_ST_BIND (sym_info) == STB_GLOBAL); | |
342 | ||
343 | if (sym_shndx == SHN_UNDEF) | |
344 | { | |
345 | /* Handle undefined functions which are defined in a shared | |
346 | library. */ | |
347 | if (ELF_ST_TYPE (sym_info) != STT_FUNC | |
348 | || ELF_ST_BIND (sym_info) != STB_GLOBAL) | |
349 | continue; | |
350 | ||
351 | ms_type = mst_solib_trampoline; | |
352 | ||
353 | /* If sym_value is nonzero, it points to the shared library | |
354 | trampoline entry, which is what we are looking for. | |
355 | ||
356 | If sym_value is zero, then we have to get the GOT entry | |
357 | for the symbol. | |
358 | If the GOT entry is nonzero, it represents the quickstart | |
359 | address of the function and we use that as the symbol value. | |
360 | ||
361 | If the GOT entry is zero, the function address has to be resolved | |
362 | by the runtime loader before the executable is started. | |
363 | We are unable to find any meaningful address for these | |
364 | functions in the executable file, so we skip them. */ | |
365 | if (sym_value == 0) | |
366 | { | |
367 | int got_entry_offset = | |
c5aa993b | 368 | (i - dt_mips_gotsym + dt_mips_local_gotno) * got_entry_size; |
c906108c SS |
369 | |
370 | if (got_entry_offset < 0 || got_entry_offset >= got_secsize) | |
371 | continue; | |
372 | sym_value = | |
373 | bfd_h_get_64 (abfd, | |
374 | (bfd_byte *) (got_secptr + got_entry_offset)); | |
375 | if (sym_value == 0) | |
376 | continue; | |
377 | } | |
378 | } | |
379 | else | |
380 | { | |
381 | /* Symbols defined in the executable itself. We only care about | |
382 | them if this is a stripped executable, otherwise they have | |
383 | been retrieved from the normal symbol table already. */ | |
384 | if (!stripped) | |
385 | continue; | |
386 | ||
387 | if (sym_shndx == SHN_MIPS_TEXT) | |
388 | { | |
389 | if (isglobal) | |
390 | ms_type = mst_text; | |
391 | else | |
392 | ms_type = mst_file_text; | |
b8fbeb18 | 393 | sym_value += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile)); |
c906108c SS |
394 | } |
395 | else if (sym_shndx == SHN_MIPS_DATA) | |
396 | { | |
397 | if (isglobal) | |
398 | ms_type = mst_data; | |
399 | else | |
400 | ms_type = mst_file_data; | |
b8fbeb18 | 401 | sym_value += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile)); |
c906108c SS |
402 | } |
403 | else if (sym_shndx == SHN_MIPS_ACOMMON) | |
404 | { | |
405 | if (isglobal) | |
406 | ms_type = mst_bss; | |
407 | else | |
408 | ms_type = mst_file_bss; | |
b8fbeb18 | 409 | sym_value += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile)); |
c906108c SS |
410 | } |
411 | else if (sym_shndx == SHN_ABS) | |
412 | { | |
413 | ms_type = mst_abs; | |
414 | } | |
415 | else | |
416 | { | |
417 | continue; | |
418 | } | |
419 | } | |
420 | ||
421 | prim_record_minimal_symbol (name, sym_value, ms_type, objfile); | |
422 | } | |
4b2e4867 PS |
423 | |
424 | do_cleanups (cleanups); | |
c906108c SS |
425 | } |
426 | ||
427 | /* Initialization */ | |
428 | ||
429 | static struct sym_fns ecoff_sym_fns = | |
430 | { | |
431 | bfd_target_ecoff_flavour, | |
432 | mipscoff_new_init, /* sym_new_init: init anything gbl to entire symtab */ | |
433 | mipscoff_symfile_init, /* sym_init: read initial info, setup for sym_read() */ | |
434 | mipscoff_symfile_read, /* sym_read: read a symbol file into symtab */ | |
435 | mipscoff_symfile_finish, /* sym_finish: finished with file, cleanup */ | |
436 | default_symfile_offsets, /* sym_offsets: dummy FIXME til implem sym reloc */ | |
437 | NULL /* next: pointer to next struct sym_fns */ | |
438 | }; | |
439 | ||
440 | void | |
fba45db2 | 441 | _initialize_mipsread (void) |
c906108c SS |
442 | { |
443 | add_symtab_fns (&ecoff_sym_fns); | |
444 | } |