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1 | /* Handle TIC6X (DSBT) shared libraries for GDB, the GNU Debugger. |
2 | Copyright (C) 2010, 2011 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | ||
20 | #include "defs.h" | |
21 | #include "gdb_string.h" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
24 | #include "solib.h" | |
25 | #include "solist.h" | |
26 | #include "objfiles.h" | |
27 | #include "symtab.h" | |
28 | #include "language.h" | |
29 | #include "command.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "elf-bfd.h" | |
32 | #include "exceptions.h" | |
33 | ||
34 | #define GOT_MODULE_OFFSET 4 | |
35 | ||
36 | /* Flag which indicates whether internal debug messages should be printed. */ | |
37 | static int solib_dsbt_debug = 0; | |
38 | ||
39 | /* TIC6X pointers are four bytes wide. */ | |
40 | enum { TIC6X_PTR_SIZE = 4 }; | |
41 | ||
42 | /* Representation of loadmap and related structs for the TIC6X DSBT. */ | |
43 | ||
44 | /* External versions; the size and alignment of the fields should be | |
45 | the same as those on the target. When loaded, the placement of | |
46 | the bits in each field will be the same as on the target. */ | |
47 | typedef gdb_byte ext_Elf32_Half[2]; | |
48 | typedef gdb_byte ext_Elf32_Addr[4]; | |
49 | typedef gdb_byte ext_Elf32_Word[4]; | |
50 | ||
51 | struct ext_elf32_dsbt_loadseg | |
52 | { | |
53 | /* Core address to which the segment is mapped. */ | |
54 | ext_Elf32_Addr addr; | |
55 | /* VMA recorded in the program header. */ | |
56 | ext_Elf32_Addr p_vaddr; | |
57 | /* Size of this segment in memory. */ | |
58 | ext_Elf32_Word p_memsz; | |
59 | }; | |
60 | ||
61 | struct ext_elf32_dsbt_loadmap { | |
62 | /* Protocol version number, must be zero. */ | |
63 | ext_Elf32_Word version; | |
64 | /* A pointer to the DSBT table; the DSBT size and the index of this | |
65 | module. */ | |
66 | ext_Elf32_Word dsbt_table_ptr; | |
67 | ext_Elf32_Word dsbt_size; | |
68 | ext_Elf32_Word dsbt_index; | |
69 | /* Number of segments in this map. */ | |
70 | ext_Elf32_Word nsegs; | |
71 | /* The actual memory map. */ | |
72 | struct ext_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; | |
73 | }; | |
74 | ||
75 | /* Internal versions; the types are GDB types and the data in each | |
76 | of the fields is (or will be) decoded from the external struct | |
77 | for ease of consumption. */ | |
78 | struct int_elf32_dsbt_loadseg | |
79 | { | |
80 | /* Core address to which the segment is mapped. */ | |
81 | CORE_ADDR addr; | |
82 | /* VMA recorded in the program header. */ | |
83 | CORE_ADDR p_vaddr; | |
84 | /* Size of this segment in memory. */ | |
85 | long p_memsz; | |
86 | }; | |
87 | ||
88 | struct int_elf32_dsbt_loadmap | |
89 | { | |
90 | /* Protocol version number, must be zero. */ | |
91 | int version; | |
92 | CORE_ADDR dsbt_table_ptr; | |
93 | /* A pointer to the DSBT table; the DSBT size and the index of this | |
94 | module. */ | |
95 | int dsbt_size, dsbt_index; | |
96 | /* Number of segments in this map. */ | |
97 | int nsegs; | |
98 | /* The actual memory map. */ | |
99 | struct int_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; | |
100 | }; | |
101 | ||
102 | /* External link_map and elf32_dsbt_loadaddr struct definitions. */ | |
103 | ||
104 | typedef gdb_byte ext_ptr[4]; | |
105 | ||
106 | struct ext_elf32_dsbt_loadaddr | |
107 | { | |
108 | ext_ptr map; /* struct elf32_dsbt_loadmap *map; */ | |
109 | }; | |
110 | ||
111 | struct ext_link_map | |
112 | { | |
113 | struct ext_elf32_dsbt_loadaddr l_addr; | |
114 | ||
115 | /* Absolute file name object was found in. */ | |
116 | ext_ptr l_name; /* char *l_name; */ | |
117 | ||
118 | /* Dynamic section of the shared object. */ | |
119 | ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */ | |
120 | ||
121 | /* Chain of loaded objects. */ | |
122 | ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */ | |
123 | }; | |
124 | ||
125 | /* Link map info to include in an allocated so_list entry */ | |
126 | ||
127 | struct lm_info | |
128 | { | |
129 | /* The loadmap, digested into an easier to use form. */ | |
130 | struct int_elf32_dsbt_loadmap *map; | |
131 | }; | |
132 | ||
133 | /* Per pspace dsbt specific data. */ | |
134 | ||
135 | struct dsbt_info | |
136 | { | |
137 | /* The load map, got value, etc. are not available from the chain | |
138 | of loaded shared objects. ``main_executable_lm_info'' provides | |
139 | a way to get at this information so that it doesn't need to be | |
140 | frequently recomputed. Initialized by dsbt_relocate_main_executable. */ | |
141 | struct lm_info *main_executable_lm_info; | |
142 | ||
143 | /* Load maps for the main executable and the interpreter. These are obtained | |
144 | from ptrace. They are the starting point for getting into the program, | |
145 | and are required to find the solib list with the individual load maps for | |
146 | each module. */ | |
147 | struct int_elf32_dsbt_loadmap *exec_loadmap; | |
148 | struct int_elf32_dsbt_loadmap *interp_loadmap; | |
149 | ||
150 | /* Cached value for lm_base, below. */ | |
151 | CORE_ADDR lm_base_cache; | |
152 | ||
153 | /* Link map address for main module. */ | |
154 | CORE_ADDR main_lm_addr; | |
155 | ||
156 | int enable_break2_done; | |
157 | ||
158 | CORE_ADDR interp_text_sect_low; | |
159 | CORE_ADDR interp_text_sect_high; | |
160 | CORE_ADDR interp_plt_sect_low; | |
161 | CORE_ADDR interp_plt_sect_high; | |
162 | }; | |
163 | ||
164 | /* Per-program-space data key. */ | |
165 | static const struct program_space_data *solib_dsbt_pspace_data; | |
166 | ||
167 | static void | |
168 | dsbt_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
169 | { | |
170 | struct dsbt_info *info; | |
171 | ||
172 | info = program_space_data (pspace, solib_dsbt_pspace_data); | |
173 | xfree (info); | |
174 | } | |
175 | ||
176 | /* Get the current dsbt data. If none is found yet, add it now. This | |
177 | function always returns a valid object. */ | |
178 | ||
179 | static struct dsbt_info * | |
180 | get_dsbt_info (void) | |
181 | { | |
182 | struct dsbt_info *info; | |
183 | ||
184 | info = program_space_data (current_program_space, solib_dsbt_pspace_data); | |
185 | if (info != NULL) | |
186 | return info; | |
187 | ||
188 | info = XZALLOC (struct dsbt_info); | |
189 | set_program_space_data (current_program_space, solib_dsbt_pspace_data, info); | |
190 | ||
191 | info->enable_break2_done = 0; | |
192 | info->lm_base_cache = 0; | |
193 | info->main_lm_addr = 0; | |
194 | ||
195 | return info; | |
196 | } | |
197 | ||
198 | ||
199 | static void | |
200 | dsbt_print_loadmap (struct int_elf32_dsbt_loadmap *map) | |
201 | { | |
202 | int i; | |
203 | ||
204 | if (map == NULL) | |
205 | printf_filtered ("(null)\n"); | |
206 | else if (map->version != 0) | |
207 | printf_filtered (_("Unsupported map version: %d\n"), map->version); | |
208 | else | |
209 | { | |
210 | printf_filtered ("version %d\n", map->version); | |
211 | ||
212 | for (i = 0; i < map->nsegs; i++) | |
213 | printf_filtered ("%s:%s -> %s:%s\n", | |
214 | print_core_address (target_gdbarch, | |
215 | map->segs[i].p_vaddr), | |
216 | print_core_address (target_gdbarch, | |
217 | map->segs[i].p_vaddr | |
218 | + map->segs[i].p_memsz), | |
219 | print_core_address (target_gdbarch, map->segs[i].addr), | |
220 | print_core_address (target_gdbarch, map->segs[i].addr | |
221 | + map->segs[i].p_memsz)); | |
222 | } | |
223 | } | |
224 | ||
225 | /* Decode int_elf32_dsbt_loadmap from BUF. */ | |
226 | ||
227 | static struct int_elf32_dsbt_loadmap * | |
228 | decode_loadmap (gdb_byte *buf) | |
229 | { | |
230 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
231 | struct ext_elf32_dsbt_loadmap *ext_ldmbuf; | |
232 | struct int_elf32_dsbt_loadmap *int_ldmbuf; | |
233 | ||
234 | int version, seg, nsegs; | |
235 | int ext_ldmbuf_size, int_ldmbuf_size; | |
236 | ||
237 | ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) buf; | |
238 | ||
239 | /* Extract the version. */ | |
240 | version = extract_unsigned_integer (ext_ldmbuf->version, | |
241 | sizeof ext_ldmbuf->version, | |
242 | byte_order); | |
243 | if (version != 0) | |
244 | { | |
245 | /* We only handle version 0. */ | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | /* Extract the number of segments. */ | |
250 | nsegs = extract_unsigned_integer (ext_ldmbuf->nsegs, | |
251 | sizeof ext_ldmbuf->nsegs, | |
252 | byte_order); | |
253 | ||
254 | if (nsegs <= 0) | |
255 | return NULL; | |
256 | ||
257 | /* Allocate space into which to put information extract from the | |
258 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
259 | int_ldmbuf_size = (sizeof (struct int_elf32_dsbt_loadmap) | |
260 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg)); | |
261 | int_ldmbuf = xmalloc (int_ldmbuf_size); | |
262 | ||
263 | /* Place extracted information in internal structs. */ | |
264 | int_ldmbuf->version = version; | |
265 | int_ldmbuf->nsegs = nsegs; | |
266 | for (seg = 0; seg < nsegs; seg++) | |
267 | { | |
268 | int_ldmbuf->segs[seg].addr | |
269 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, | |
270 | sizeof (ext_ldmbuf->segs[seg].addr), | |
271 | byte_order); | |
272 | int_ldmbuf->segs[seg].p_vaddr | |
273 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, | |
274 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), | |
275 | byte_order); | |
276 | int_ldmbuf->segs[seg].p_memsz | |
277 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, | |
278 | sizeof (ext_ldmbuf->segs[seg].p_memsz), | |
279 | byte_order); | |
280 | } | |
281 | ||
282 | xfree (ext_ldmbuf); | |
283 | return int_ldmbuf; | |
284 | } | |
285 | ||
286 | ||
287 | static struct dsbt_info *get_dsbt_info (void); | |
288 | ||
289 | /* Interrogate the Linux kernel to find out where the program was loaded. | |
290 | There are two load maps; one for the executable and one for the | |
291 | interpreter (only in the case of a dynamically linked executable). */ | |
292 | ||
293 | static void | |
294 | dsbt_get_initial_loadmaps (void) | |
295 | { | |
296 | gdb_byte *buf; | |
297 | struct dsbt_info *info = get_dsbt_info (); | |
298 | ||
299 | if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC, | |
300 | "exec", (gdb_byte**) &buf)) | |
301 | { | |
302 | info->exec_loadmap = NULL; | |
303 | error (_("Error reading DSBT exec loadmap")); | |
304 | } | |
305 | info->exec_loadmap = decode_loadmap (buf); | |
306 | if (solib_dsbt_debug) | |
307 | dsbt_print_loadmap (info->exec_loadmap); | |
308 | ||
309 | if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC, | |
310 | "interp", (gdb_byte**)&buf)) | |
311 | { | |
312 | info->interp_loadmap = NULL; | |
313 | error (_("Error reading DSBT interp loadmap")); | |
314 | } | |
315 | info->interp_loadmap = decode_loadmap (buf); | |
316 | if (solib_dsbt_debug) | |
317 | dsbt_print_loadmap (info->interp_loadmap); | |
318 | } | |
319 | ||
320 | /* Given address LDMADDR, fetch and decode the loadmap at that address. | |
321 | Return NULL if there is a problem reading the target memory or if | |
322 | there doesn't appear to be a loadmap at the given address. The | |
323 | allocated space (representing the loadmap) returned by this | |
324 | function may be freed via a single call to xfree. */ | |
325 | ||
326 | static struct int_elf32_dsbt_loadmap * | |
327 | fetch_loadmap (CORE_ADDR ldmaddr) | |
328 | { | |
329 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
330 | struct ext_elf32_dsbt_loadmap ext_ldmbuf_partial; | |
331 | struct ext_elf32_dsbt_loadmap *ext_ldmbuf; | |
332 | struct int_elf32_dsbt_loadmap *int_ldmbuf; | |
333 | int ext_ldmbuf_size, int_ldmbuf_size; | |
334 | int version, seg, nsegs; | |
335 | ||
336 | /* Fetch initial portion of the loadmap. */ | |
337 | if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial, | |
338 | sizeof ext_ldmbuf_partial)) | |
339 | { | |
340 | /* Problem reading the target's memory. */ | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | /* Extract the version. */ | |
345 | version = extract_unsigned_integer (ext_ldmbuf_partial.version, | |
346 | sizeof ext_ldmbuf_partial.version, | |
347 | byte_order); | |
348 | if (version != 0) | |
349 | { | |
350 | /* We only handle version 0. */ | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | /* Extract the number of segments. */ | |
355 | nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs, | |
356 | sizeof ext_ldmbuf_partial.nsegs, | |
357 | byte_order); | |
358 | ||
359 | if (nsegs <= 0) | |
360 | return NULL; | |
361 | ||
362 | /* Allocate space for the complete (external) loadmap. */ | |
363 | ext_ldmbuf_size = sizeof (struct ext_elf32_dsbt_loadmap) | |
364 | + (nsegs - 1) * sizeof (struct ext_elf32_dsbt_loadseg); | |
365 | ext_ldmbuf = xmalloc (ext_ldmbuf_size); | |
366 | ||
367 | /* Copy over the portion of the loadmap that's already been read. */ | |
368 | memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial); | |
369 | ||
370 | /* Read the rest of the loadmap from the target. */ | |
371 | if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial, | |
372 | (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial, | |
373 | ext_ldmbuf_size - sizeof ext_ldmbuf_partial)) | |
374 | { | |
375 | /* Couldn't read rest of the loadmap. */ | |
376 | xfree (ext_ldmbuf); | |
377 | return NULL; | |
378 | } | |
379 | ||
380 | /* Allocate space into which to put information extract from the | |
381 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
382 | int_ldmbuf_size = sizeof (struct int_elf32_dsbt_loadmap) | |
383 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg); | |
384 | int_ldmbuf = xmalloc (int_ldmbuf_size); | |
385 | ||
386 | /* Place extracted information in internal structs. */ | |
387 | int_ldmbuf->version = version; | |
388 | int_ldmbuf->nsegs = nsegs; | |
389 | for (seg = 0; seg < nsegs; seg++) | |
390 | { | |
391 | int_ldmbuf->segs[seg].addr | |
392 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, | |
393 | sizeof (ext_ldmbuf->segs[seg].addr), | |
394 | byte_order); | |
395 | int_ldmbuf->segs[seg].p_vaddr | |
396 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, | |
397 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), | |
398 | byte_order); | |
399 | int_ldmbuf->segs[seg].p_memsz | |
400 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, | |
401 | sizeof (ext_ldmbuf->segs[seg].p_memsz), | |
402 | byte_order); | |
403 | } | |
404 | ||
405 | xfree (ext_ldmbuf); | |
406 | return int_ldmbuf; | |
407 | } | |
408 | ||
409 | static void dsbt_relocate_main_executable (void); | |
410 | static int enable_break2 (void); | |
411 | ||
412 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is | |
413 | returned and the corresponding PTR is set. */ | |
414 | ||
415 | static int | |
416 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
417 | { | |
418 | int arch_size, step, sect_size; | |
419 | long dyn_tag; | |
420 | CORE_ADDR dyn_ptr, dyn_addr; | |
421 | gdb_byte *bufend, *bufstart, *buf; | |
422 | Elf32_External_Dyn *x_dynp_32; | |
423 | Elf64_External_Dyn *x_dynp_64; | |
424 | struct bfd_section *sect; | |
425 | struct target_section *target_section; | |
426 | ||
427 | if (abfd == NULL) | |
428 | return 0; | |
429 | ||
430 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
431 | return 0; | |
432 | ||
433 | arch_size = bfd_get_arch_size (abfd); | |
434 | if (arch_size == -1) | |
435 | return 0; | |
436 | ||
437 | /* Find the start address of the .dynamic section. */ | |
438 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
439 | if (sect == NULL) | |
440 | return 0; | |
441 | ||
442 | for (target_section = current_target_sections->sections; | |
443 | target_section < current_target_sections->sections_end; | |
444 | target_section++) | |
445 | if (sect == target_section->the_bfd_section) | |
446 | break; | |
447 | if (target_section < current_target_sections->sections_end) | |
448 | dyn_addr = target_section->addr; | |
449 | else | |
450 | { | |
451 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
452 | loaded into the target (see add_symbol_file_command). This case is | |
453 | such fallback to the file VMA address without the possibility of | |
454 | having the section relocated to its actual in-memory address. */ | |
455 | ||
456 | dyn_addr = bfd_section_vma (abfd, sect); | |
457 | } | |
458 | ||
459 | /* Read in .dynamic from the BFD. We will get the actual value | |
460 | from memory later. */ | |
461 | sect_size = bfd_section_size (abfd, sect); | |
462 | buf = bufstart = alloca (sect_size); | |
463 | if (!bfd_get_section_contents (abfd, sect, | |
464 | buf, 0, sect_size)) | |
465 | return 0; | |
466 | ||
467 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
468 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
469 | : sizeof (Elf64_External_Dyn); | |
470 | for (bufend = buf + sect_size; | |
471 | buf < bufend; | |
472 | buf += step) | |
473 | { | |
474 | if (arch_size == 32) | |
475 | { | |
476 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
477 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
478 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
479 | } | |
480 | else | |
481 | { | |
482 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
483 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
484 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
485 | } | |
486 | if (dyn_tag == DT_NULL) | |
487 | return 0; | |
488 | if (dyn_tag == dyntag) | |
489 | { | |
490 | /* If requested, try to read the runtime value of this .dynamic | |
491 | entry. */ | |
492 | if (ptr) | |
493 | { | |
494 | struct type *ptr_type; | |
495 | gdb_byte ptr_buf[8]; | |
496 | CORE_ADDR ptr_addr; | |
497 | ||
498 | ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
499 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; | |
500 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) | |
501 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); | |
502 | *ptr = dyn_ptr; | |
503 | } | |
504 | return 1; | |
505 | } | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | /* An expensive way to lookup the value of a single symbol for | |
512 | bfd's that are only temporary anyway. This is used by the | |
513 | shared library support to find the address of the debugger | |
514 | interface structures in the shared library. | |
515 | ||
516 | Note that 0 is specifically allowed as an error return (no | |
517 | such symbol). */ | |
518 | ||
519 | static CORE_ADDR | |
520 | bfd_lookup_symbol (bfd *abfd, char *symname) | |
521 | { | |
522 | long storage_needed; | |
523 | asymbol *sym; | |
524 | asymbol **symbol_table; | |
525 | unsigned int number_of_symbols; | |
526 | unsigned int i; | |
527 | struct cleanup *back_to; | |
528 | CORE_ADDR symaddr = 0; | |
529 | ||
530 | storage_needed = bfd_get_symtab_upper_bound (abfd); | |
531 | ||
532 | if (storage_needed > 0) | |
533 | { | |
534 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
535 | back_to = make_cleanup (xfree, symbol_table); | |
536 | number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); | |
537 | ||
538 | for (i = 0; i < number_of_symbols; i++) | |
539 | { | |
540 | sym = *symbol_table++; | |
541 | if (strcmp (sym->name, symname) == 0) | |
542 | { | |
543 | /* Bfd symbols are section relative. */ | |
544 | symaddr = sym->value + sym->section->vma; | |
545 | break; | |
546 | } | |
547 | } | |
548 | do_cleanups (back_to); | |
549 | } | |
550 | ||
551 | if (symaddr) | |
552 | return symaddr; | |
553 | ||
554 | /* Look for the symbol in the dynamic string table too. */ | |
555 | ||
556 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
557 | ||
558 | if (storage_needed > 0) | |
559 | { | |
560 | symbol_table = (asymbol **) xmalloc (storage_needed); | |
561 | back_to = make_cleanup (xfree, symbol_table); | |
562 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, symbol_table); | |
563 | ||
564 | for (i = 0; i < number_of_symbols; i++) | |
565 | { | |
566 | sym = *symbol_table++; | |
567 | if (strcmp (sym->name, symname) == 0) | |
568 | { | |
569 | /* Bfd symbols are section relative. */ | |
570 | symaddr = sym->value + sym->section->vma; | |
571 | break; | |
572 | } | |
573 | } | |
574 | do_cleanups (back_to); | |
575 | } | |
576 | ||
577 | return symaddr; | |
578 | } | |
579 | ||
580 | ||
581 | /* If no open symbol file, attempt to locate and open the main symbol | |
582 | file. | |
583 | ||
584 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
585 | be printed. This parameter is a pointer rather than an int because | |
586 | open_symbol_file_object is called via catch_errors and | |
587 | catch_errors requires a pointer argument. */ | |
588 | ||
589 | static int | |
590 | open_symbol_file_object (void *from_ttyp) | |
591 | { | |
592 | /* Unimplemented. */ | |
593 | return 0; | |
594 | } | |
595 | ||
596 | /* Given a loadmap and an address, return the displacement needed | |
597 | to relocate the address. */ | |
598 | ||
599 | static CORE_ADDR | |
600 | displacement_from_map (struct int_elf32_dsbt_loadmap *map, | |
601 | CORE_ADDR addr) | |
602 | { | |
603 | int seg; | |
604 | ||
605 | for (seg = 0; seg < map->nsegs; seg++) | |
606 | if (map->segs[seg].p_vaddr <= addr | |
607 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
608 | return map->segs[seg].addr - map->segs[seg].p_vaddr; | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | /* Return the address from which the link map chain may be found. On | |
614 | DSBT, a pointer to the start of the link map will be located at the | |
615 | word found at base of GOT + GOT_MODULE_OFFSET. | |
616 | ||
617 | The base of GOT may be found in a number of ways. Assuming that the | |
618 | main executable has already been relocated, | |
619 | 1 The easiest way to find this value is to look up the address of | |
620 | _GLOBAL_OFFSET_TABLE_. | |
621 | 2 The other way is to look for tag DT_PLTGOT, which contains the virtual | |
622 | address of Global Offset Table. .*/ | |
623 | ||
624 | static CORE_ADDR | |
625 | lm_base (void) | |
626 | { | |
627 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
628 | struct minimal_symbol *got_sym; | |
629 | CORE_ADDR addr; | |
630 | gdb_byte buf[TIC6X_PTR_SIZE]; | |
631 | struct dsbt_info *info = get_dsbt_info (); | |
632 | ||
633 | /* One of our assumptions is that the main executable has been relocated. | |
634 | Bail out if this has not happened. (Note that post_create_inferior | |
635 | in infcmd.c will call solib_add prior to solib_create_inferior_hook. | |
636 | If we allow this to happen, lm_base_cache will be initialized with | |
637 | a bogus value. */ | |
638 | if (info->main_executable_lm_info == 0) | |
639 | return 0; | |
640 | ||
641 | /* If we already have a cached value, return it. */ | |
642 | if (info->lm_base_cache) | |
643 | return info->lm_base_cache; | |
644 | ||
645 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, | |
646 | symfile_objfile); | |
647 | ||
648 | if (got_sym != 0) | |
649 | { | |
650 | addr = SYMBOL_VALUE_ADDRESS (got_sym); | |
651 | if (solib_dsbt_debug) | |
652 | fprintf_unfiltered (gdb_stdlog, | |
653 | "lm_base: get addr %x by _GLOBAL_OFFSET_TABLE_.\n", | |
654 | (unsigned int) addr); | |
655 | } | |
656 | else if (scan_dyntag (DT_PLTGOT, exec_bfd, &addr)) | |
657 | { | |
658 | struct int_elf32_dsbt_loadmap *ldm; | |
659 | ||
660 | dsbt_get_initial_loadmaps (); | |
661 | ldm = info->exec_loadmap; | |
662 | addr += displacement_from_map (ldm, addr); | |
663 | if (solib_dsbt_debug) | |
664 | fprintf_unfiltered (gdb_stdlog, | |
665 | "lm_base: get addr %x by DT_PLTGOT.\n", | |
666 | (unsigned int) addr); | |
667 | } | |
668 | else | |
669 | { | |
670 | if (solib_dsbt_debug) | |
671 | fprintf_unfiltered (gdb_stdlog, | |
672 | "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n"); | |
673 | return 0; | |
674 | } | |
675 | addr += GOT_MODULE_OFFSET; | |
676 | ||
677 | if (solib_dsbt_debug) | |
678 | fprintf_unfiltered (gdb_stdlog, | |
679 | "lm_base: _GLOBAL_OFFSET_TABLE_ + %d = %s\n", | |
680 | GOT_MODULE_OFFSET, hex_string_custom (addr, 8)); | |
681 | ||
682 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
683 | return 0; | |
684 | info->lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); | |
685 | ||
686 | if (solib_dsbt_debug) | |
687 | fprintf_unfiltered (gdb_stdlog, | |
688 | "lm_base: lm_base_cache = %s\n", | |
689 | hex_string_custom (info->lm_base_cache, 8)); | |
690 | ||
691 | return info->lm_base_cache; | |
692 | } | |
693 | ||
694 | ||
695 | /* Build a list of `struct so_list' objects describing the shared | |
696 | objects currently loaded in the inferior. This list does not | |
697 | include an entry for the main executable file. | |
698 | ||
699 | Note that we only gather information directly available from the | |
700 | inferior --- we don't examine any of the shared library files | |
701 | themselves. The declaration of `struct so_list' says which fields | |
702 | we provide values for. */ | |
703 | ||
704 | static struct so_list * | |
705 | dsbt_current_sos (void) | |
706 | { | |
707 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
708 | CORE_ADDR lm_addr; | |
709 | struct so_list *sos_head = NULL; | |
710 | struct so_list **sos_next_ptr = &sos_head; | |
711 | struct dsbt_info *info = get_dsbt_info (); | |
712 | ||
713 | /* Make sure that the main executable has been relocated. This is | |
714 | required in order to find the address of the global offset table, | |
715 | which in turn is used to find the link map info. (See lm_base | |
716 | for details.) | |
717 | ||
718 | Note that the relocation of the main executable is also performed | |
719 | by SOLIB_CREATE_INFERIOR_HOOK, however, in the case of core | |
720 | files, this hook is called too late in order to be of benefit to | |
721 | SOLIB_ADD. SOLIB_ADD eventually calls this function, | |
722 | dsbt_current_sos, and also precedes the call to | |
723 | SOLIB_CREATE_INFERIOR_HOOK. (See post_create_inferior in | |
724 | infcmd.c.) */ | |
725 | if (info->main_executable_lm_info == 0 && core_bfd != NULL) | |
726 | dsbt_relocate_main_executable (); | |
727 | ||
728 | /* Locate the address of the first link map struct. */ | |
729 | lm_addr = lm_base (); | |
730 | ||
731 | /* We have at least one link map entry. Fetch the the lot of them, | |
732 | building the solist chain. */ | |
733 | while (lm_addr) | |
734 | { | |
735 | struct ext_link_map lm_buf; | |
736 | ext_Elf32_Word indexword; | |
737 | CORE_ADDR map_addr; | |
738 | int dsbt_index; | |
739 | int ret; | |
740 | ||
741 | if (solib_dsbt_debug) | |
742 | fprintf_unfiltered (gdb_stdlog, | |
743 | "current_sos: reading link_map entry at %s\n", | |
744 | hex_string_custom (lm_addr, 8)); | |
745 | ||
746 | ret = target_read_memory (lm_addr, (gdb_byte *) &lm_buf, sizeof (lm_buf)); | |
747 | if (ret) | |
748 | { | |
749 | warning (_("dsbt_current_sos: Unable to read link map entry." | |
750 | " Shared object chain may be incomplete.")); | |
751 | break; | |
752 | } | |
753 | ||
754 | /* Fetch the load map address. */ | |
755 | map_addr = extract_unsigned_integer (lm_buf.l_addr.map, | |
756 | sizeof lm_buf.l_addr.map, | |
757 | byte_order); | |
758 | ||
759 | ret = target_read_memory (map_addr + 12, (gdb_byte *) &indexword, | |
760 | sizeof indexword); | |
761 | if (ret) | |
762 | { | |
763 | warning (_("dsbt_current_sos: Unable to read dsbt index." | |
764 | " Shared object chain may be incomplete.")); | |
765 | break; | |
766 | } | |
767 | dsbt_index = extract_unsigned_integer (indexword, sizeof indexword, | |
768 | byte_order); | |
769 | ||
770 | /* If the DSBT index is zero, then we're looking at the entry | |
771 | for the main executable. By convention, we don't include | |
772 | this in the list of shared objects. */ | |
773 | if (dsbt_index != 0) | |
774 | { | |
775 | int errcode; | |
776 | char *name_buf; | |
777 | struct int_elf32_dsbt_loadmap *loadmap; | |
778 | struct so_list *sop; | |
779 | CORE_ADDR addr; | |
780 | ||
781 | loadmap = fetch_loadmap (map_addr); | |
782 | if (loadmap == NULL) | |
783 | { | |
784 | warning (_("dsbt_current_sos: Unable to fetch load map." | |
785 | " Shared object chain may be incomplete.")); | |
786 | break; | |
787 | } | |
788 | ||
789 | sop = xcalloc (1, sizeof (struct so_list)); | |
790 | sop->lm_info = xcalloc (1, sizeof (struct lm_info)); | |
791 | sop->lm_info->map = loadmap; | |
792 | /* Fetch the name. */ | |
793 | addr = extract_unsigned_integer (lm_buf.l_name, | |
794 | sizeof (lm_buf.l_name), | |
795 | byte_order); | |
796 | target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1, | |
797 | &errcode); | |
798 | ||
799 | if (errcode != 0) | |
800 | warning (_("Can't read pathname for link map entry: %s."), | |
801 | safe_strerror (errcode)); | |
802 | else | |
803 | { | |
804 | if (solib_dsbt_debug) | |
805 | fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n", | |
806 | name_buf); | |
807 | ||
808 | strncpy (sop->so_name, name_buf, SO_NAME_MAX_PATH_SIZE - 1); | |
809 | sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
810 | xfree (name_buf); | |
811 | strcpy (sop->so_original_name, sop->so_name); | |
812 | } | |
813 | ||
814 | *sos_next_ptr = sop; | |
815 | sos_next_ptr = &sop->next; | |
816 | } | |
817 | else | |
818 | { | |
819 | info->main_lm_addr = lm_addr; | |
820 | } | |
821 | ||
822 | lm_addr = extract_unsigned_integer (lm_buf.l_next, | |
823 | sizeof (lm_buf.l_next), byte_order); | |
824 | } | |
825 | ||
826 | enable_break2 (); | |
827 | ||
828 | return sos_head; | |
829 | } | |
830 | ||
831 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
832 | run time loader. */ | |
833 | ||
834 | static int | |
835 | dsbt_in_dynsym_resolve_code (CORE_ADDR pc) | |
836 | { | |
837 | struct dsbt_info *info = get_dsbt_info (); | |
838 | ||
839 | return ((pc >= info->interp_text_sect_low && pc < info->interp_text_sect_high) | |
840 | || (pc >= info->interp_plt_sect_low && pc < info->interp_plt_sect_high) | |
841 | || in_plt_section (pc, NULL)); | |
842 | } | |
843 | ||
844 | /* Print a warning about being unable to set the dynamic linker | |
845 | breakpoint. */ | |
846 | ||
847 | static void | |
848 | enable_break_failure_warning (void) | |
849 | { | |
850 | warning (_("Unable to find dynamic linker breakpoint function.\n" | |
851 | "GDB will be unable to debug shared library initializers\n" | |
852 | "and track explicitly loaded dynamic code.")); | |
853 | } | |
854 | ||
855 | /* The dynamic linkers has, as part of its debugger interface, support | |
856 | for arranging for the inferior to hit a breakpoint after mapping in | |
857 | the shared libraries. This function enables that breakpoint. | |
858 | ||
859 | On the TIC6X, using the shared library (DSBT), the symbol | |
860 | _dl_debug_addr points to the r_debug struct which contains | |
861 | a field called r_brk. r_brk is the address of the function | |
862 | descriptor upon which a breakpoint must be placed. Being a | |
863 | function descriptor, we must extract the entry point in order | |
864 | to set the breakpoint. | |
865 | ||
866 | Our strategy will be to get the .interp section from the | |
867 | executable. This section will provide us with the name of the | |
868 | interpreter. We'll open the interpreter and then look up | |
869 | the address of _dl_debug_addr. We then relocate this address | |
870 | using the interpreter's loadmap. Once the relocated address | |
871 | is known, we fetch the value (address) corresponding to r_brk | |
872 | and then use that value to fetch the entry point of the function | |
873 | we're interested in. */ | |
874 | ||
875 | static int | |
876 | enable_break2 (void) | |
877 | { | |
878 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
879 | int success = 0; | |
880 | char **bkpt_namep; | |
881 | asection *interp_sect; | |
882 | struct dsbt_info *info = get_dsbt_info (); | |
883 | ||
884 | if (exec_bfd == NULL) | |
885 | return 0; | |
886 | ||
887 | if (!target_has_execution) | |
888 | return 0; | |
889 | ||
890 | if (info->enable_break2_done) | |
891 | return 1; | |
892 | ||
893 | info->interp_text_sect_low = 0; | |
894 | info->interp_text_sect_high = 0; | |
895 | info->interp_plt_sect_low = 0; | |
896 | info->interp_plt_sect_high = 0; | |
897 | ||
898 | /* Find the .interp section; if not found, warn the user and drop | |
899 | into the old breakpoint at symbol code. */ | |
900 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
901 | if (interp_sect) | |
902 | { | |
903 | unsigned int interp_sect_size; | |
904 | gdb_byte *buf; | |
905 | bfd *tmp_bfd = NULL; | |
906 | int status; | |
907 | CORE_ADDR addr, interp_loadmap_addr; | |
908 | gdb_byte addr_buf[TIC6X_PTR_SIZE]; | |
909 | struct int_elf32_dsbt_loadmap *ldm; | |
910 | volatile struct gdb_exception ex; | |
911 | ||
912 | /* Read the contents of the .interp section into a local buffer; | |
913 | the contents specify the dynamic linker this program uses. */ | |
914 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
915 | buf = alloca (interp_sect_size); | |
916 | bfd_get_section_contents (exec_bfd, interp_sect, | |
917 | buf, 0, interp_sect_size); | |
918 | ||
919 | /* Now we need to figure out where the dynamic linker was | |
920 | loaded so that we can load its symbols and place a breakpoint | |
921 | in the dynamic linker itself. */ | |
922 | ||
923 | TRY_CATCH (ex, RETURN_MASK_ALL) | |
924 | { | |
925 | tmp_bfd = solib_bfd_open (buf); | |
926 | } | |
927 | if (tmp_bfd == NULL) | |
928 | { | |
929 | enable_break_failure_warning (); | |
930 | return 0; | |
931 | } | |
932 | ||
933 | dsbt_get_initial_loadmaps (); | |
934 | ldm = info->interp_loadmap; | |
935 | ||
936 | /* Record the relocated start and end address of the dynamic linker | |
937 | text and plt section for dsbt_in_dynsym_resolve_code. */ | |
938 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
939 | if (interp_sect) | |
940 | { | |
941 | info->interp_text_sect_low | |
942 | = bfd_section_vma (tmp_bfd, interp_sect); | |
943 | info->interp_text_sect_low | |
944 | += displacement_from_map (ldm, info->interp_text_sect_low); | |
945 | info->interp_text_sect_high | |
946 | = info->interp_text_sect_low | |
947 | + bfd_section_size (tmp_bfd, interp_sect); | |
948 | } | |
949 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
950 | if (interp_sect) | |
951 | { | |
952 | info->interp_plt_sect_low = | |
953 | bfd_section_vma (tmp_bfd, interp_sect); | |
954 | info->interp_plt_sect_low | |
955 | += displacement_from_map (ldm, info->interp_plt_sect_low); | |
956 | info->interp_plt_sect_high = | |
957 | info->interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
958 | } | |
959 | ||
960 | addr = bfd_lookup_symbol (tmp_bfd, "_dl_debug_addr"); | |
961 | if (addr == 0) | |
962 | { | |
963 | warning (_("Could not find symbol _dl_debug_addr in dynamic linker")); | |
964 | enable_break_failure_warning (); | |
965 | bfd_close (tmp_bfd); | |
966 | return 0; | |
967 | } | |
968 | ||
969 | if (solib_dsbt_debug) | |
970 | fprintf_unfiltered (gdb_stdlog, | |
971 | "enable_break: _dl_debug_addr (prior to relocation) = %s\n", | |
972 | hex_string_custom (addr, 8)); | |
973 | ||
974 | addr += displacement_from_map (ldm, addr); | |
975 | ||
976 | if (solib_dsbt_debug) | |
977 | fprintf_unfiltered (gdb_stdlog, | |
978 | "enable_break: _dl_debug_addr (after relocation) = %s\n", | |
979 | hex_string_custom (addr, 8)); | |
980 | ||
981 | /* Fetch the address of the r_debug struct. */ | |
982 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
983 | { | |
984 | warning (_("Unable to fetch contents of _dl_debug_addr " | |
985 | "(at address %s) from dynamic linker"), | |
986 | hex_string_custom (addr, 8)); | |
987 | } | |
988 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); | |
989 | ||
990 | if (solib_dsbt_debug) | |
991 | fprintf_unfiltered (gdb_stdlog, | |
992 | "enable_break: _dl_debug_addr[0..3] = %s\n", | |
993 | hex_string_custom (addr, 8)); | |
994 | ||
995 | /* If it's zero, then the ldso hasn't initialized yet, and so | |
996 | there are no shared libs yet loaded. */ | |
997 | if (addr == 0) | |
998 | { | |
999 | if (solib_dsbt_debug) | |
1000 | fprintf_unfiltered (gdb_stdlog, | |
1001 | "enable_break: ldso not yet initialized\n"); | |
1002 | /* Do not warn, but mark to run again. */ | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | /* Fetch the r_brk field. It's 8 bytes from the start of | |
1007 | _dl_debug_addr. */ | |
1008 | if (target_read_memory (addr + 8, addr_buf, sizeof addr_buf) != 0) | |
1009 | { | |
1010 | warning (_("Unable to fetch _dl_debug_addr->r_brk " | |
1011 | "(at address %s) from dynamic linker"), | |
1012 | hex_string_custom (addr + 8, 8)); | |
1013 | enable_break_failure_warning (); | |
1014 | bfd_close (tmp_bfd); | |
1015 | return 0; | |
1016 | } | |
1017 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); | |
1018 | ||
1019 | /* We're done with the temporary bfd. */ | |
1020 | bfd_close (tmp_bfd); | |
1021 | ||
1022 | /* We're also done with the loadmap. */ | |
1023 | xfree (ldm); | |
1024 | ||
1025 | /* Remove all the solib event breakpoints. Their addresses | |
1026 | may have changed since the last time we ran the program. */ | |
1027 | remove_solib_event_breakpoints (); | |
1028 | ||
1029 | /* Now (finally!) create the solib breakpoint. */ | |
1030 | create_solib_event_breakpoint (target_gdbarch, addr); | |
1031 | ||
1032 | info->enable_break2_done = 1; | |
1033 | ||
1034 | return 1; | |
1035 | } | |
1036 | ||
1037 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ | |
1038 | enable_break_failure_warning (); | |
1039 | ||
1040 | /* Failure return. */ | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static int | |
1045 | enable_break (void) | |
1046 | { | |
1047 | asection *interp_sect; | |
1048 | struct minimal_symbol *start; | |
1049 | ||
1050 | /* Check for the presence of a .interp section. If there is no | |
1051 | such section, the executable is statically linked. */ | |
1052 | ||
1053 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
1054 | ||
1055 | if (interp_sect == NULL) | |
1056 | { | |
1057 | if (solib_dsbt_debug) | |
1058 | fprintf_unfiltered (gdb_stdlog, | |
1059 | "enable_break: No .interp section found.\n"); | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | start = lookup_minimal_symbol ("_start", NULL, symfile_objfile); | |
1064 | if (start == NULL) | |
1065 | { | |
1066 | if (solib_dsbt_debug) | |
1067 | fprintf_unfiltered (gdb_stdlog, | |
1068 | "enable_break: symbol _start is not found.\n"); | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | create_solib_event_breakpoint (target_gdbarch, | |
1073 | SYMBOL_VALUE_ADDRESS (start)); | |
1074 | ||
1075 | if (solib_dsbt_debug) | |
1076 | fprintf_unfiltered (gdb_stdlog, | |
1077 | "enable_break: solib event breakpoint placed at : %s\n", | |
1078 | hex_string_custom (SYMBOL_VALUE_ADDRESS (start), 8)); | |
1079 | return 1; | |
1080 | } | |
1081 | ||
1082 | /* Once the symbols from a shared object have been loaded in the usual | |
1083 | way, we are called to do any system specific symbol handling that | |
1084 | is needed. */ | |
1085 | ||
1086 | static void | |
1087 | dsbt_special_symbol_handling (void) | |
1088 | { | |
1089 | } | |
1090 | ||
1091 | static void | |
1092 | dsbt_relocate_main_executable (void) | |
1093 | { | |
1094 | int status; | |
1095 | CORE_ADDR exec_addr, interp_addr; | |
1096 | struct int_elf32_dsbt_loadmap *ldm; | |
1097 | struct cleanup *old_chain; | |
1098 | struct section_offsets *new_offsets; | |
1099 | int changed; | |
1100 | struct obj_section *osect; | |
1101 | struct dsbt_info *info = get_dsbt_info (); | |
1102 | ||
1103 | dsbt_get_initial_loadmaps (); | |
1104 | ldm = info->exec_loadmap; | |
1105 | ||
1106 | xfree (info->main_executable_lm_info); | |
1107 | info->main_executable_lm_info = xcalloc (1, sizeof (struct lm_info)); | |
1108 | info->main_executable_lm_info->map = ldm; | |
1109 | ||
1110 | new_offsets = xcalloc (symfile_objfile->num_sections, | |
1111 | sizeof (struct section_offsets)); | |
1112 | old_chain = make_cleanup (xfree, new_offsets); | |
1113 | changed = 0; | |
1114 | ||
1115 | ALL_OBJFILE_OSECTIONS (symfile_objfile, osect) | |
1116 | { | |
1117 | CORE_ADDR orig_addr, addr, offset; | |
1118 | int osect_idx; | |
1119 | int seg; | |
1120 | ||
1121 | osect_idx = osect->the_bfd_section->index; | |
1122 | ||
1123 | /* Current address of section. */ | |
1124 | addr = obj_section_addr (osect); | |
1125 | /* Offset from where this section started. */ | |
1126 | offset = ANOFFSET (symfile_objfile->section_offsets, osect_idx); | |
1127 | /* Original address prior to any past relocations. */ | |
1128 | orig_addr = addr - offset; | |
1129 | ||
1130 | for (seg = 0; seg < ldm->nsegs; seg++) | |
1131 | { | |
1132 | if (ldm->segs[seg].p_vaddr <= orig_addr | |
1133 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) | |
1134 | { | |
1135 | new_offsets->offsets[osect_idx] | |
1136 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; | |
1137 | ||
1138 | if (new_offsets->offsets[osect_idx] != offset) | |
1139 | changed = 1; | |
1140 | break; | |
1141 | } | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | if (changed) | |
1146 | objfile_relocate (symfile_objfile, new_offsets); | |
1147 | ||
1148 | do_cleanups (old_chain); | |
1149 | ||
1150 | /* Now that symfile_objfile has been relocated, we can compute the | |
1151 | GOT value and stash it away. */ | |
1152 | } | |
1153 | ||
1154 | /* When gdb starts up the inferior, it nurses it along (through the | |
1155 | shell) until it is ready to execute it's first instruction. At this | |
1156 | point, this function gets called via expansion of the macro | |
1157 | SOLIB_CREATE_INFERIOR_HOOK. | |
1158 | ||
1159 | For the DSBT shared library, the main executable needs to be relocated. | |
1160 | The shared library breakpoints also need to be enabled. | |
1161 | */ | |
1162 | ||
1163 | static void | |
1164 | dsbt_solib_create_inferior_hook (int from_tty) | |
1165 | { | |
1166 | /* Relocate main executable. */ | |
1167 | dsbt_relocate_main_executable (); | |
1168 | ||
1169 | /* Enable shared library breakpoints. */ | |
1170 | if (!enable_break ()) | |
1171 | { | |
1172 | warning (_("shared library handler failed to enable breakpoint")); | |
1173 | return; | |
1174 | } | |
1175 | } | |
1176 | ||
1177 | static void | |
1178 | dsbt_clear_solib (void) | |
1179 | { | |
1180 | struct dsbt_info *info = get_dsbt_info (); | |
1181 | ||
1182 | info->lm_base_cache = 0; | |
1183 | info->enable_break2_done = 0; | |
1184 | info->main_lm_addr = 0; | |
1185 | if (info->main_executable_lm_info != 0) | |
1186 | { | |
1187 | xfree (info->main_executable_lm_info->map); | |
1188 | xfree (info->main_executable_lm_info); | |
1189 | info->main_executable_lm_info = 0; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | static void | |
1194 | dsbt_free_so (struct so_list *so) | |
1195 | { | |
1196 | xfree (so->lm_info->map); | |
1197 | xfree (so->lm_info); | |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | dsbt_relocate_section_addresses (struct so_list *so, | |
1202 | struct target_section *sec) | |
1203 | { | |
1204 | int seg; | |
1205 | struct int_elf32_dsbt_loadmap *map; | |
1206 | ||
1207 | map = so->lm_info->map; | |
1208 | ||
1209 | for (seg = 0; seg < map->nsegs; seg++) | |
1210 | { | |
1211 | if (map->segs[seg].p_vaddr <= sec->addr | |
1212 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
1213 | { | |
1214 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; | |
1215 | ||
1216 | sec->addr += displ; | |
1217 | sec->endaddr += displ; | |
1218 | break; | |
1219 | } | |
1220 | } | |
1221 | } | |
1222 | static void | |
1223 | show_dsbt_debug (struct ui_file *file, int from_tty, | |
1224 | struct cmd_list_element *c, const char *value) | |
1225 | { | |
1226 | fprintf_filtered (file, _("solib-dsbt debugging is %s.\n"), value); | |
1227 | } | |
1228 | ||
1229 | struct target_so_ops dsbt_so_ops; | |
1230 | ||
1231 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1232 | extern initialize_file_ftype _initialize_dsbt_solib; | |
1233 | ||
1234 | void | |
1235 | _initialize_dsbt_solib (void) | |
1236 | { | |
1237 | solib_dsbt_pspace_data | |
1238 | = register_program_space_data_with_cleanup (dsbt_pspace_data_cleanup); | |
1239 | ||
1240 | dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses; | |
1241 | dsbt_so_ops.free_so = dsbt_free_so; | |
1242 | dsbt_so_ops.clear_solib = dsbt_clear_solib; | |
1243 | dsbt_so_ops.solib_create_inferior_hook = dsbt_solib_create_inferior_hook; | |
1244 | dsbt_so_ops.special_symbol_handling = dsbt_special_symbol_handling; | |
1245 | dsbt_so_ops.current_sos = dsbt_current_sos; | |
1246 | dsbt_so_ops.open_symbol_file_object = open_symbol_file_object; | |
1247 | dsbt_so_ops.in_dynsym_resolve_code = dsbt_in_dynsym_resolve_code; | |
1248 | dsbt_so_ops.bfd_open = solib_bfd_open; | |
1249 | ||
1250 | /* Debug this file's internals. */ | |
1251 | add_setshow_zinteger_cmd ("solib-dsbt", class_maintenance, | |
1252 | &solib_dsbt_debug, _("\ | |
1253 | Set internal debugging of shared library code for DSBT ELF."), _("\ | |
1254 | Show internal debugging of shared library code for DSBT ELF."), _("\ | |
1255 | When non-zero, DSBT solib specific internal debugging is enabled."), | |
1256 | NULL, | |
1257 | show_dsbt_debug, | |
1258 | &setdebuglist, &showdebuglist); | |
1259 | } |