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