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8cd64e00 | 1 | /* Handle TIC6X (DSBT) shared libraries for GDB, the GNU Debugger. |
618f726f | 2 | Copyright (C) 2010-2016 Free Software Foundation, Inc. |
8cd64e00 YQ |
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" | |
8cd64e00 YQ |
21 | #include "inferior.h" |
22 | #include "gdbcore.h" | |
23 | #include "solib.h" | |
24 | #include "solist.h" | |
25 | #include "objfiles.h" | |
26 | #include "symtab.h" | |
27 | #include "language.h" | |
28 | #include "command.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "elf-bfd.h" | |
cbb099e8 | 31 | #include "gdb_bfd.h" |
8cd64e00 YQ |
32 | |
33 | #define GOT_MODULE_OFFSET 4 | |
34 | ||
35 | /* Flag which indicates whether internal debug messages should be printed. */ | |
ccce17b0 | 36 | static unsigned int solib_dsbt_debug = 0; |
8cd64e00 YQ |
37 | |
38 | /* TIC6X pointers are four bytes wide. */ | |
39 | enum { TIC6X_PTR_SIZE = 4 }; | |
40 | ||
41 | /* Representation of loadmap and related structs for the TIC6X DSBT. */ | |
42 | ||
43 | /* External versions; the size and alignment of the fields should be | |
44 | the same as those on the target. When loaded, the placement of | |
45 | the bits in each field will be the same as on the target. */ | |
46 | typedef gdb_byte ext_Elf32_Half[2]; | |
47 | typedef gdb_byte ext_Elf32_Addr[4]; | |
48 | typedef gdb_byte ext_Elf32_Word[4]; | |
49 | ||
50 | struct ext_elf32_dsbt_loadseg | |
51 | { | |
52 | /* Core address to which the segment is mapped. */ | |
53 | ext_Elf32_Addr addr; | |
54 | /* VMA recorded in the program header. */ | |
55 | ext_Elf32_Addr p_vaddr; | |
56 | /* Size of this segment in memory. */ | |
57 | ext_Elf32_Word p_memsz; | |
58 | }; | |
59 | ||
60 | struct ext_elf32_dsbt_loadmap { | |
61 | /* Protocol version number, must be zero. */ | |
62 | ext_Elf32_Word version; | |
63 | /* A pointer to the DSBT table; the DSBT size and the index of this | |
64 | module. */ | |
65 | ext_Elf32_Word dsbt_table_ptr; | |
66 | ext_Elf32_Word dsbt_size; | |
67 | ext_Elf32_Word dsbt_index; | |
68 | /* Number of segments in this map. */ | |
69 | ext_Elf32_Word nsegs; | |
70 | /* The actual memory map. */ | |
71 | struct ext_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; | |
72 | }; | |
73 | ||
74 | /* Internal versions; the types are GDB types and the data in each | |
75 | of the fields is (or will be) decoded from the external struct | |
76 | for ease of consumption. */ | |
77 | struct int_elf32_dsbt_loadseg | |
78 | { | |
79 | /* Core address to which the segment is mapped. */ | |
80 | CORE_ADDR addr; | |
81 | /* VMA recorded in the program header. */ | |
82 | CORE_ADDR p_vaddr; | |
83 | /* Size of this segment in memory. */ | |
84 | long p_memsz; | |
85 | }; | |
86 | ||
87 | struct int_elf32_dsbt_loadmap | |
88 | { | |
89 | /* Protocol version number, must be zero. */ | |
90 | int version; | |
91 | CORE_ADDR dsbt_table_ptr; | |
92 | /* A pointer to the DSBT table; the DSBT size and the index of this | |
93 | module. */ | |
94 | int dsbt_size, dsbt_index; | |
95 | /* Number of segments in this map. */ | |
96 | int nsegs; | |
97 | /* The actual memory map. */ | |
98 | struct int_elf32_dsbt_loadseg segs[1 /* nsegs, actually */]; | |
99 | }; | |
100 | ||
101 | /* External link_map and elf32_dsbt_loadaddr struct definitions. */ | |
102 | ||
103 | typedef gdb_byte ext_ptr[4]; | |
104 | ||
105 | struct ext_elf32_dsbt_loadaddr | |
106 | { | |
107 | ext_ptr map; /* struct elf32_dsbt_loadmap *map; */ | |
108 | }; | |
109 | ||
110 | struct ext_link_map | |
111 | { | |
112 | struct ext_elf32_dsbt_loadaddr l_addr; | |
113 | ||
114 | /* Absolute file name object was found in. */ | |
115 | ext_ptr l_name; /* char *l_name; */ | |
116 | ||
117 | /* Dynamic section of the shared object. */ | |
118 | ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */ | |
119 | ||
120 | /* Chain of loaded objects. */ | |
121 | ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */ | |
122 | }; | |
123 | ||
124 | /* Link map info to include in an allocated so_list entry */ | |
125 | ||
126 | struct lm_info | |
127 | { | |
128 | /* The loadmap, digested into an easier to use form. */ | |
129 | struct int_elf32_dsbt_loadmap *map; | |
130 | }; | |
131 | ||
132 | /* Per pspace dsbt specific data. */ | |
133 | ||
134 | struct dsbt_info | |
135 | { | |
136 | /* The load map, got value, etc. are not available from the chain | |
137 | of loaded shared objects. ``main_executable_lm_info'' provides | |
138 | a way to get at this information so that it doesn't need to be | |
139 | frequently recomputed. Initialized by dsbt_relocate_main_executable. */ | |
140 | struct lm_info *main_executable_lm_info; | |
141 | ||
142 | /* Load maps for the main executable and the interpreter. These are obtained | |
143 | from ptrace. They are the starting point for getting into the program, | |
144 | and are required to find the solib list with the individual load maps for | |
145 | each module. */ | |
146 | struct int_elf32_dsbt_loadmap *exec_loadmap; | |
147 | struct int_elf32_dsbt_loadmap *interp_loadmap; | |
148 | ||
149 | /* Cached value for lm_base, below. */ | |
150 | CORE_ADDR lm_base_cache; | |
151 | ||
152 | /* Link map address for main module. */ | |
153 | CORE_ADDR main_lm_addr; | |
154 | ||
8cd64e00 YQ |
155 | CORE_ADDR interp_text_sect_low; |
156 | CORE_ADDR interp_text_sect_high; | |
157 | CORE_ADDR interp_plt_sect_low; | |
158 | CORE_ADDR interp_plt_sect_high; | |
159 | }; | |
160 | ||
161 | /* Per-program-space data key. */ | |
162 | static const struct program_space_data *solib_dsbt_pspace_data; | |
163 | ||
164 | static void | |
165 | dsbt_pspace_data_cleanup (struct program_space *pspace, void *arg) | |
166 | { | |
487ad57c | 167 | xfree (arg); |
8cd64e00 YQ |
168 | } |
169 | ||
170 | /* Get the current dsbt data. If none is found yet, add it now. This | |
171 | function always returns a valid object. */ | |
172 | ||
173 | static struct dsbt_info * | |
174 | get_dsbt_info (void) | |
175 | { | |
176 | struct dsbt_info *info; | |
177 | ||
19ba03f4 SM |
178 | info = (struct dsbt_info *) program_space_data (current_program_space, |
179 | solib_dsbt_pspace_data); | |
8cd64e00 YQ |
180 | if (info != NULL) |
181 | return info; | |
182 | ||
41bf6aca | 183 | info = XCNEW (struct dsbt_info); |
8cd64e00 YQ |
184 | set_program_space_data (current_program_space, solib_dsbt_pspace_data, info); |
185 | ||
8cd64e00 YQ |
186 | info->lm_base_cache = 0; |
187 | info->main_lm_addr = 0; | |
188 | ||
189 | return info; | |
190 | } | |
191 | ||
192 | ||
193 | static void | |
194 | dsbt_print_loadmap (struct int_elf32_dsbt_loadmap *map) | |
195 | { | |
196 | int i; | |
197 | ||
198 | if (map == NULL) | |
199 | printf_filtered ("(null)\n"); | |
200 | else if (map->version != 0) | |
201 | printf_filtered (_("Unsupported map version: %d\n"), map->version); | |
202 | else | |
203 | { | |
204 | printf_filtered ("version %d\n", map->version); | |
205 | ||
206 | for (i = 0; i < map->nsegs; i++) | |
207 | printf_filtered ("%s:%s -> %s:%s\n", | |
f5656ead | 208 | print_core_address (target_gdbarch (), |
8cd64e00 | 209 | map->segs[i].p_vaddr), |
f5656ead | 210 | print_core_address (target_gdbarch (), |
8cd64e00 YQ |
211 | map->segs[i].p_vaddr |
212 | + map->segs[i].p_memsz), | |
f5656ead TT |
213 | print_core_address (target_gdbarch (), map->segs[i].addr), |
214 | print_core_address (target_gdbarch (), map->segs[i].addr | |
8cd64e00 YQ |
215 | + map->segs[i].p_memsz)); |
216 | } | |
217 | } | |
218 | ||
219 | /* Decode int_elf32_dsbt_loadmap from BUF. */ | |
220 | ||
221 | static struct int_elf32_dsbt_loadmap * | |
222 | decode_loadmap (gdb_byte *buf) | |
223 | { | |
f5656ead | 224 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8cd64e00 YQ |
225 | struct ext_elf32_dsbt_loadmap *ext_ldmbuf; |
226 | struct int_elf32_dsbt_loadmap *int_ldmbuf; | |
227 | ||
228 | int version, seg, nsegs; | |
22e048c9 | 229 | int int_ldmbuf_size; |
8cd64e00 YQ |
230 | |
231 | ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) buf; | |
232 | ||
233 | /* Extract the version. */ | |
234 | version = extract_unsigned_integer (ext_ldmbuf->version, | |
235 | sizeof ext_ldmbuf->version, | |
236 | byte_order); | |
237 | if (version != 0) | |
238 | { | |
239 | /* We only handle version 0. */ | |
240 | return NULL; | |
241 | } | |
242 | ||
243 | /* Extract the number of segments. */ | |
244 | nsegs = extract_unsigned_integer (ext_ldmbuf->nsegs, | |
245 | sizeof ext_ldmbuf->nsegs, | |
246 | byte_order); | |
247 | ||
248 | if (nsegs <= 0) | |
249 | return NULL; | |
250 | ||
251 | /* Allocate space into which to put information extract from the | |
252 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
253 | int_ldmbuf_size = (sizeof (struct int_elf32_dsbt_loadmap) | |
254 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg)); | |
224c3ddb | 255 | int_ldmbuf = (struct int_elf32_dsbt_loadmap *) xmalloc (int_ldmbuf_size); |
8cd64e00 YQ |
256 | |
257 | /* Place extracted information in internal structs. */ | |
258 | int_ldmbuf->version = version; | |
259 | int_ldmbuf->nsegs = nsegs; | |
260 | for (seg = 0; seg < nsegs; seg++) | |
261 | { | |
262 | int_ldmbuf->segs[seg].addr | |
263 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, | |
264 | sizeof (ext_ldmbuf->segs[seg].addr), | |
265 | byte_order); | |
266 | int_ldmbuf->segs[seg].p_vaddr | |
267 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, | |
268 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), | |
269 | byte_order); | |
270 | int_ldmbuf->segs[seg].p_memsz | |
271 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, | |
272 | sizeof (ext_ldmbuf->segs[seg].p_memsz), | |
273 | byte_order); | |
274 | } | |
275 | ||
276 | xfree (ext_ldmbuf); | |
277 | return int_ldmbuf; | |
278 | } | |
279 | ||
280 | ||
281 | static struct dsbt_info *get_dsbt_info (void); | |
282 | ||
283 | /* Interrogate the Linux kernel to find out where the program was loaded. | |
284 | There are two load maps; one for the executable and one for the | |
285 | interpreter (only in the case of a dynamically linked executable). */ | |
286 | ||
287 | static void | |
288 | dsbt_get_initial_loadmaps (void) | |
289 | { | |
290 | gdb_byte *buf; | |
291 | struct dsbt_info *info = get_dsbt_info (); | |
292 | ||
293 | if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC, | |
a0bcdaa7 | 294 | "exec", &buf)) |
8cd64e00 YQ |
295 | { |
296 | info->exec_loadmap = NULL; | |
297 | error (_("Error reading DSBT exec loadmap")); | |
298 | } | |
299 | info->exec_loadmap = decode_loadmap (buf); | |
300 | if (solib_dsbt_debug) | |
301 | dsbt_print_loadmap (info->exec_loadmap); | |
302 | ||
303 | if (0 >= target_read_alloc (¤t_target, TARGET_OBJECT_FDPIC, | |
a0bcdaa7 | 304 | "interp", &buf)) |
8cd64e00 YQ |
305 | { |
306 | info->interp_loadmap = NULL; | |
307 | error (_("Error reading DSBT interp loadmap")); | |
308 | } | |
309 | info->interp_loadmap = decode_loadmap (buf); | |
310 | if (solib_dsbt_debug) | |
311 | dsbt_print_loadmap (info->interp_loadmap); | |
312 | } | |
313 | ||
314 | /* Given address LDMADDR, fetch and decode the loadmap at that address. | |
315 | Return NULL if there is a problem reading the target memory or if | |
316 | there doesn't appear to be a loadmap at the given address. The | |
317 | allocated space (representing the loadmap) returned by this | |
318 | function may be freed via a single call to xfree. */ | |
319 | ||
320 | static struct int_elf32_dsbt_loadmap * | |
321 | fetch_loadmap (CORE_ADDR ldmaddr) | |
322 | { | |
f5656ead | 323 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8cd64e00 YQ |
324 | struct ext_elf32_dsbt_loadmap ext_ldmbuf_partial; |
325 | struct ext_elf32_dsbt_loadmap *ext_ldmbuf; | |
326 | struct int_elf32_dsbt_loadmap *int_ldmbuf; | |
327 | int ext_ldmbuf_size, int_ldmbuf_size; | |
328 | int version, seg, nsegs; | |
329 | ||
330 | /* Fetch initial portion of the loadmap. */ | |
331 | if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial, | |
7ee4732a | 332 | sizeof ext_ldmbuf_partial)) |
8cd64e00 YQ |
333 | { |
334 | /* Problem reading the target's memory. */ | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | /* Extract the version. */ | |
339 | version = extract_unsigned_integer (ext_ldmbuf_partial.version, | |
7ee4732a | 340 | sizeof ext_ldmbuf_partial.version, |
8cd64e00 YQ |
341 | byte_order); |
342 | if (version != 0) | |
343 | { | |
344 | /* We only handle version 0. */ | |
345 | return NULL; | |
346 | } | |
347 | ||
348 | /* Extract the number of segments. */ | |
349 | nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs, | |
350 | sizeof ext_ldmbuf_partial.nsegs, | |
351 | byte_order); | |
352 | ||
353 | if (nsegs <= 0) | |
354 | return NULL; | |
355 | ||
356 | /* Allocate space for the complete (external) loadmap. */ | |
357 | ext_ldmbuf_size = sizeof (struct ext_elf32_dsbt_loadmap) | |
358 | + (nsegs - 1) * sizeof (struct ext_elf32_dsbt_loadseg); | |
224c3ddb | 359 | ext_ldmbuf = (struct ext_elf32_dsbt_loadmap *) xmalloc (ext_ldmbuf_size); |
8cd64e00 YQ |
360 | |
361 | /* Copy over the portion of the loadmap that's already been read. */ | |
362 | memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial); | |
363 | ||
364 | /* Read the rest of the loadmap from the target. */ | |
365 | if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial, | |
366 | (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial, | |
367 | ext_ldmbuf_size - sizeof ext_ldmbuf_partial)) | |
368 | { | |
369 | /* Couldn't read rest of the loadmap. */ | |
370 | xfree (ext_ldmbuf); | |
371 | return NULL; | |
372 | } | |
373 | ||
374 | /* Allocate space into which to put information extract from the | |
375 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
376 | int_ldmbuf_size = sizeof (struct int_elf32_dsbt_loadmap) | |
377 | + (nsegs - 1) * sizeof (struct int_elf32_dsbt_loadseg); | |
224c3ddb | 378 | int_ldmbuf = (struct int_elf32_dsbt_loadmap *) xmalloc (int_ldmbuf_size); |
8cd64e00 YQ |
379 | |
380 | /* Place extracted information in internal structs. */ | |
381 | int_ldmbuf->version = version; | |
382 | int_ldmbuf->nsegs = nsegs; | |
383 | for (seg = 0; seg < nsegs; seg++) | |
384 | { | |
385 | int_ldmbuf->segs[seg].addr | |
386 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, | |
387 | sizeof (ext_ldmbuf->segs[seg].addr), | |
388 | byte_order); | |
389 | int_ldmbuf->segs[seg].p_vaddr | |
390 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, | |
391 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), | |
392 | byte_order); | |
393 | int_ldmbuf->segs[seg].p_memsz | |
394 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, | |
395 | sizeof (ext_ldmbuf->segs[seg].p_memsz), | |
396 | byte_order); | |
397 | } | |
398 | ||
399 | xfree (ext_ldmbuf); | |
400 | return int_ldmbuf; | |
401 | } | |
402 | ||
403 | static void dsbt_relocate_main_executable (void); | |
3582629f | 404 | static int enable_break (void); |
8cd64e00 YQ |
405 | |
406 | /* Scan for DYNTAG in .dynamic section of ABFD. If DYNTAG is found 1 is | |
407 | returned and the corresponding PTR is set. */ | |
408 | ||
409 | static int | |
410 | scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr) | |
411 | { | |
412 | int arch_size, step, sect_size; | |
413 | long dyn_tag; | |
414 | CORE_ADDR dyn_ptr, dyn_addr; | |
415 | gdb_byte *bufend, *bufstart, *buf; | |
416 | Elf32_External_Dyn *x_dynp_32; | |
417 | Elf64_External_Dyn *x_dynp_64; | |
418 | struct bfd_section *sect; | |
419 | struct target_section *target_section; | |
420 | ||
421 | if (abfd == NULL) | |
422 | return 0; | |
423 | ||
424 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) | |
425 | return 0; | |
426 | ||
427 | arch_size = bfd_get_arch_size (abfd); | |
428 | if (arch_size == -1) | |
429 | return 0; | |
430 | ||
431 | /* Find the start address of the .dynamic section. */ | |
432 | sect = bfd_get_section_by_name (abfd, ".dynamic"); | |
433 | if (sect == NULL) | |
434 | return 0; | |
435 | ||
436 | for (target_section = current_target_sections->sections; | |
437 | target_section < current_target_sections->sections_end; | |
438 | target_section++) | |
439 | if (sect == target_section->the_bfd_section) | |
440 | break; | |
441 | if (target_section < current_target_sections->sections_end) | |
442 | dyn_addr = target_section->addr; | |
443 | else | |
444 | { | |
445 | /* ABFD may come from OBJFILE acting only as a symbol file without being | |
446 | loaded into the target (see add_symbol_file_command). This case is | |
447 | such fallback to the file VMA address without the possibility of | |
448 | having the section relocated to its actual in-memory address. */ | |
449 | ||
450 | dyn_addr = bfd_section_vma (abfd, sect); | |
451 | } | |
452 | ||
453 | /* Read in .dynamic from the BFD. We will get the actual value | |
454 | from memory later. */ | |
455 | sect_size = bfd_section_size (abfd, sect); | |
224c3ddb | 456 | buf = bufstart = (gdb_byte *) alloca (sect_size); |
8cd64e00 YQ |
457 | if (!bfd_get_section_contents (abfd, sect, |
458 | buf, 0, sect_size)) | |
459 | return 0; | |
460 | ||
461 | /* Iterate over BUF and scan for DYNTAG. If found, set PTR and return. */ | |
462 | step = (arch_size == 32) ? sizeof (Elf32_External_Dyn) | |
463 | : sizeof (Elf64_External_Dyn); | |
464 | for (bufend = buf + sect_size; | |
465 | buf < bufend; | |
466 | buf += step) | |
467 | { | |
468 | if (arch_size == 32) | |
469 | { | |
470 | x_dynp_32 = (Elf32_External_Dyn *) buf; | |
471 | dyn_tag = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_tag); | |
472 | dyn_ptr = bfd_h_get_32 (abfd, (bfd_byte *) x_dynp_32->d_un.d_ptr); | |
473 | } | |
474 | else | |
475 | { | |
476 | x_dynp_64 = (Elf64_External_Dyn *) buf; | |
477 | dyn_tag = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_tag); | |
478 | dyn_ptr = bfd_h_get_64 (abfd, (bfd_byte *) x_dynp_64->d_un.d_ptr); | |
479 | } | |
480 | if (dyn_tag == DT_NULL) | |
481 | return 0; | |
482 | if (dyn_tag == dyntag) | |
483 | { | |
484 | /* If requested, try to read the runtime value of this .dynamic | |
485 | entry. */ | |
486 | if (ptr) | |
487 | { | |
488 | struct type *ptr_type; | |
489 | gdb_byte ptr_buf[8]; | |
490 | CORE_ADDR ptr_addr; | |
491 | ||
f5656ead | 492 | ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; |
8cd64e00 YQ |
493 | ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8; |
494 | if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0) | |
495 | dyn_ptr = extract_typed_address (ptr_buf, ptr_type); | |
496 | *ptr = dyn_ptr; | |
497 | } | |
498 | return 1; | |
499 | } | |
500 | } | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
8cd64e00 YQ |
505 | /* If no open symbol file, attempt to locate and open the main symbol |
506 | file. | |
507 | ||
508 | If FROM_TTYP dereferences to a non-zero integer, allow messages to | |
509 | be printed. This parameter is a pointer rather than an int because | |
510 | open_symbol_file_object is called via catch_errors and | |
511 | catch_errors requires a pointer argument. */ | |
512 | ||
513 | static int | |
514 | open_symbol_file_object (void *from_ttyp) | |
515 | { | |
516 | /* Unimplemented. */ | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* Given a loadmap and an address, return the displacement needed | |
521 | to relocate the address. */ | |
522 | ||
523 | static CORE_ADDR | |
524 | displacement_from_map (struct int_elf32_dsbt_loadmap *map, | |
7ee4732a | 525 | CORE_ADDR addr) |
8cd64e00 YQ |
526 | { |
527 | int seg; | |
528 | ||
529 | for (seg = 0; seg < map->nsegs; seg++) | |
530 | if (map->segs[seg].p_vaddr <= addr | |
531 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
532 | return map->segs[seg].addr - map->segs[seg].p_vaddr; | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | /* Return the address from which the link map chain may be found. On | |
538 | DSBT, a pointer to the start of the link map will be located at the | |
539 | word found at base of GOT + GOT_MODULE_OFFSET. | |
540 | ||
541 | The base of GOT may be found in a number of ways. Assuming that the | |
542 | main executable has already been relocated, | |
543 | 1 The easiest way to find this value is to look up the address of | |
544 | _GLOBAL_OFFSET_TABLE_. | |
545 | 2 The other way is to look for tag DT_PLTGOT, which contains the virtual | |
546 | address of Global Offset Table. .*/ | |
547 | ||
548 | static CORE_ADDR | |
549 | lm_base (void) | |
550 | { | |
f5656ead | 551 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
3b7344d5 | 552 | struct bound_minimal_symbol got_sym; |
8cd64e00 YQ |
553 | CORE_ADDR addr; |
554 | gdb_byte buf[TIC6X_PTR_SIZE]; | |
555 | struct dsbt_info *info = get_dsbt_info (); | |
556 | ||
557 | /* One of our assumptions is that the main executable has been relocated. | |
558 | Bail out if this has not happened. (Note that post_create_inferior | |
559 | in infcmd.c will call solib_add prior to solib_create_inferior_hook. | |
560 | If we allow this to happen, lm_base_cache will be initialized with | |
561 | a bogus value. */ | |
562 | if (info->main_executable_lm_info == 0) | |
563 | return 0; | |
564 | ||
565 | /* If we already have a cached value, return it. */ | |
566 | if (info->lm_base_cache) | |
567 | return info->lm_base_cache; | |
568 | ||
569 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, | |
570 | symfile_objfile); | |
571 | ||
3b7344d5 | 572 | if (got_sym.minsym != 0) |
8cd64e00 | 573 | { |
77e371c0 | 574 | addr = BMSYMBOL_VALUE_ADDRESS (got_sym); |
8cd64e00 YQ |
575 | if (solib_dsbt_debug) |
576 | fprintf_unfiltered (gdb_stdlog, | |
577 | "lm_base: get addr %x by _GLOBAL_OFFSET_TABLE_.\n", | |
578 | (unsigned int) addr); | |
579 | } | |
580 | else if (scan_dyntag (DT_PLTGOT, exec_bfd, &addr)) | |
581 | { | |
582 | struct int_elf32_dsbt_loadmap *ldm; | |
583 | ||
584 | dsbt_get_initial_loadmaps (); | |
585 | ldm = info->exec_loadmap; | |
586 | addr += displacement_from_map (ldm, addr); | |
587 | if (solib_dsbt_debug) | |
588 | fprintf_unfiltered (gdb_stdlog, | |
589 | "lm_base: get addr %x by DT_PLTGOT.\n", | |
590 | (unsigned int) addr); | |
591 | } | |
592 | else | |
593 | { | |
594 | if (solib_dsbt_debug) | |
595 | fprintf_unfiltered (gdb_stdlog, | |
596 | "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n"); | |
597 | return 0; | |
598 | } | |
599 | addr += GOT_MODULE_OFFSET; | |
600 | ||
601 | if (solib_dsbt_debug) | |
602 | fprintf_unfiltered (gdb_stdlog, | |
603 | "lm_base: _GLOBAL_OFFSET_TABLE_ + %d = %s\n", | |
604 | GOT_MODULE_OFFSET, hex_string_custom (addr, 8)); | |
605 | ||
606 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
607 | return 0; | |
608 | info->lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); | |
609 | ||
610 | if (solib_dsbt_debug) | |
611 | fprintf_unfiltered (gdb_stdlog, | |
612 | "lm_base: lm_base_cache = %s\n", | |
613 | hex_string_custom (info->lm_base_cache, 8)); | |
614 | ||
615 | return info->lm_base_cache; | |
616 | } | |
617 | ||
618 | ||
619 | /* Build a list of `struct so_list' objects describing the shared | |
620 | objects currently loaded in the inferior. This list does not | |
621 | include an entry for the main executable file. | |
622 | ||
623 | Note that we only gather information directly available from the | |
624 | inferior --- we don't examine any of the shared library files | |
625 | themselves. The declaration of `struct so_list' says which fields | |
626 | we provide values for. */ | |
627 | ||
628 | static struct so_list * | |
629 | dsbt_current_sos (void) | |
630 | { | |
f5656ead | 631 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8cd64e00 YQ |
632 | CORE_ADDR lm_addr; |
633 | struct so_list *sos_head = NULL; | |
634 | struct so_list **sos_next_ptr = &sos_head; | |
635 | struct dsbt_info *info = get_dsbt_info (); | |
636 | ||
637 | /* Make sure that the main executable has been relocated. This is | |
638 | required in order to find the address of the global offset table, | |
639 | which in turn is used to find the link map info. (See lm_base | |
640 | for details.) | |
641 | ||
642 | Note that the relocation of the main executable is also performed | |
4d1eb6b4 | 643 | by solib_create_inferior_hook, however, in the case of core |
8cd64e00 | 644 | files, this hook is called too late in order to be of benefit to |
4d1eb6b4 | 645 | solib_add. solib_add eventually calls this function, |
8cd64e00 | 646 | dsbt_current_sos, and also precedes the call to |
4d1eb6b4 | 647 | solib_create_inferior_hook. (See post_create_inferior in |
8cd64e00 YQ |
648 | infcmd.c.) */ |
649 | if (info->main_executable_lm_info == 0 && core_bfd != NULL) | |
650 | dsbt_relocate_main_executable (); | |
651 | ||
652 | /* Locate the address of the first link map struct. */ | |
653 | lm_addr = lm_base (); | |
654 | ||
655 | /* We have at least one link map entry. Fetch the the lot of them, | |
656 | building the solist chain. */ | |
657 | while (lm_addr) | |
658 | { | |
659 | struct ext_link_map lm_buf; | |
660 | ext_Elf32_Word indexword; | |
661 | CORE_ADDR map_addr; | |
662 | int dsbt_index; | |
663 | int ret; | |
664 | ||
665 | if (solib_dsbt_debug) | |
666 | fprintf_unfiltered (gdb_stdlog, | |
667 | "current_sos: reading link_map entry at %s\n", | |
668 | hex_string_custom (lm_addr, 8)); | |
669 | ||
670 | ret = target_read_memory (lm_addr, (gdb_byte *) &lm_buf, sizeof (lm_buf)); | |
671 | if (ret) | |
672 | { | |
673 | warning (_("dsbt_current_sos: Unable to read link map entry." | |
674 | " Shared object chain may be incomplete.")); | |
675 | break; | |
676 | } | |
677 | ||
678 | /* Fetch the load map address. */ | |
679 | map_addr = extract_unsigned_integer (lm_buf.l_addr.map, | |
680 | sizeof lm_buf.l_addr.map, | |
681 | byte_order); | |
682 | ||
683 | ret = target_read_memory (map_addr + 12, (gdb_byte *) &indexword, | |
684 | sizeof indexword); | |
685 | if (ret) | |
686 | { | |
687 | warning (_("dsbt_current_sos: Unable to read dsbt index." | |
688 | " Shared object chain may be incomplete.")); | |
689 | break; | |
690 | } | |
691 | dsbt_index = extract_unsigned_integer (indexword, sizeof indexword, | |
692 | byte_order); | |
693 | ||
694 | /* If the DSBT index is zero, then we're looking at the entry | |
695 | for the main executable. By convention, we don't include | |
696 | this in the list of shared objects. */ | |
697 | if (dsbt_index != 0) | |
698 | { | |
699 | int errcode; | |
700 | char *name_buf; | |
701 | struct int_elf32_dsbt_loadmap *loadmap; | |
702 | struct so_list *sop; | |
703 | CORE_ADDR addr; | |
704 | ||
705 | loadmap = fetch_loadmap (map_addr); | |
706 | if (loadmap == NULL) | |
707 | { | |
708 | warning (_("dsbt_current_sos: Unable to fetch load map." | |
709 | " Shared object chain may be incomplete.")); | |
710 | break; | |
711 | } | |
712 | ||
8d749320 SM |
713 | sop = XCNEW (struct so_list); |
714 | sop->lm_info = XCNEW (struct lm_info); | |
8cd64e00 YQ |
715 | sop->lm_info->map = loadmap; |
716 | /* Fetch the name. */ | |
717 | addr = extract_unsigned_integer (lm_buf.l_name, | |
718 | sizeof (lm_buf.l_name), | |
719 | byte_order); | |
720 | target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1, | |
721 | &errcode); | |
722 | ||
723 | if (errcode != 0) | |
724 | warning (_("Can't read pathname for link map entry: %s."), | |
725 | safe_strerror (errcode)); | |
726 | else | |
727 | { | |
728 | if (solib_dsbt_debug) | |
729 | fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n", | |
730 | name_buf); | |
731 | ||
732 | strncpy (sop->so_name, name_buf, SO_NAME_MAX_PATH_SIZE - 1); | |
733 | sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
734 | xfree (name_buf); | |
735 | strcpy (sop->so_original_name, sop->so_name); | |
736 | } | |
737 | ||
738 | *sos_next_ptr = sop; | |
739 | sos_next_ptr = &sop->next; | |
740 | } | |
741 | else | |
742 | { | |
743 | info->main_lm_addr = lm_addr; | |
744 | } | |
745 | ||
746 | lm_addr = extract_unsigned_integer (lm_buf.l_next, | |
747 | sizeof (lm_buf.l_next), byte_order); | |
748 | } | |
749 | ||
8cd64e00 YQ |
750 | return sos_head; |
751 | } | |
752 | ||
753 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
754 | run time loader. */ | |
755 | ||
756 | static int | |
757 | dsbt_in_dynsym_resolve_code (CORE_ADDR pc) | |
758 | { | |
759 | struct dsbt_info *info = get_dsbt_info (); | |
760 | ||
761 | return ((pc >= info->interp_text_sect_low && pc < info->interp_text_sect_high) | |
762 | || (pc >= info->interp_plt_sect_low && pc < info->interp_plt_sect_high) | |
3e5d3a5a | 763 | || in_plt_section (pc)); |
8cd64e00 YQ |
764 | } |
765 | ||
766 | /* Print a warning about being unable to set the dynamic linker | |
767 | breakpoint. */ | |
768 | ||
769 | static void | |
770 | enable_break_failure_warning (void) | |
771 | { | |
772 | warning (_("Unable to find dynamic linker breakpoint function.\n" | |
7ee4732a YQ |
773 | "GDB will be unable to debug shared library initializers\n" |
774 | "and track explicitly loaded dynamic code.")); | |
8cd64e00 YQ |
775 | } |
776 | ||
cb457ae2 YQ |
777 | /* Helper function for gdb_bfd_lookup_symbol. */ |
778 | ||
779 | static int | |
3953f15c | 780 | cmp_name (const asymbol *sym, const void *data) |
cb457ae2 YQ |
781 | { |
782 | return (strcmp (sym->name, (const char *) data) == 0); | |
783 | } | |
784 | ||
8cd64e00 YQ |
785 | /* The dynamic linkers has, as part of its debugger interface, support |
786 | for arranging for the inferior to hit a breakpoint after mapping in | |
787 | the shared libraries. This function enables that breakpoint. | |
788 | ||
3582629f YQ |
789 | On the TIC6X, using the shared library (DSBT), GDB can try to place |
790 | a breakpoint on '_dl_debug_state' to monitor the shared library | |
791 | event. */ | |
8cd64e00 YQ |
792 | |
793 | static int | |
3582629f | 794 | enable_break (void) |
8cd64e00 | 795 | { |
f5656ead | 796 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
8cd64e00 | 797 | asection *interp_sect; |
3582629f | 798 | struct dsbt_info *info; |
8cd64e00 YQ |
799 | |
800 | if (exec_bfd == NULL) | |
801 | return 0; | |
802 | ||
803 | if (!target_has_execution) | |
804 | return 0; | |
805 | ||
3582629f YQ |
806 | info = get_dsbt_info (); |
807 | ||
8cd64e00 YQ |
808 | info->interp_text_sect_low = 0; |
809 | info->interp_text_sect_high = 0; | |
810 | info->interp_plt_sect_low = 0; | |
811 | info->interp_plt_sect_high = 0; | |
812 | ||
813 | /* Find the .interp section; if not found, warn the user and drop | |
814 | into the old breakpoint at symbol code. */ | |
815 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
816 | if (interp_sect) | |
817 | { | |
818 | unsigned int interp_sect_size; | |
001f13d8 | 819 | char *buf; |
8cd64e00 | 820 | bfd *tmp_bfd = NULL; |
22e048c9 | 821 | CORE_ADDR addr; |
8cd64e00 YQ |
822 | gdb_byte addr_buf[TIC6X_PTR_SIZE]; |
823 | struct int_elf32_dsbt_loadmap *ldm; | |
3582629f | 824 | int ret; |
8cd64e00 YQ |
825 | |
826 | /* Read the contents of the .interp section into a local buffer; | |
7ee4732a | 827 | the contents specify the dynamic linker this program uses. */ |
8cd64e00 | 828 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); |
224c3ddb | 829 | buf = (char *) alloca (interp_sect_size); |
8cd64e00 YQ |
830 | bfd_get_section_contents (exec_bfd, interp_sect, |
831 | buf, 0, interp_sect_size); | |
832 | ||
833 | /* Now we need to figure out where the dynamic linker was | |
7ee4732a YQ |
834 | loaded so that we can load its symbols and place a breakpoint |
835 | in the dynamic linker itself. */ | |
8cd64e00 | 836 | |
492d29ea | 837 | TRY |
7ee4732a YQ |
838 | { |
839 | tmp_bfd = solib_bfd_open (buf); | |
840 | } | |
492d29ea PA |
841 | CATCH (ex, RETURN_MASK_ALL) |
842 | { | |
843 | } | |
844 | END_CATCH | |
845 | ||
8cd64e00 YQ |
846 | if (tmp_bfd == NULL) |
847 | { | |
848 | enable_break_failure_warning (); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | dsbt_get_initial_loadmaps (); | |
853 | ldm = info->interp_loadmap; | |
854 | ||
855 | /* Record the relocated start and end address of the dynamic linker | |
7ee4732a | 856 | text and plt section for dsbt_in_dynsym_resolve_code. */ |
8cd64e00 YQ |
857 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); |
858 | if (interp_sect) | |
859 | { | |
860 | info->interp_text_sect_low | |
861 | = bfd_section_vma (tmp_bfd, interp_sect); | |
862 | info->interp_text_sect_low | |
863 | += displacement_from_map (ldm, info->interp_text_sect_low); | |
864 | info->interp_text_sect_high | |
865 | = info->interp_text_sect_low | |
866 | + bfd_section_size (tmp_bfd, interp_sect); | |
867 | } | |
868 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
869 | if (interp_sect) | |
870 | { | |
871 | info->interp_plt_sect_low = | |
872 | bfd_section_vma (tmp_bfd, interp_sect); | |
873 | info->interp_plt_sect_low | |
874 | += displacement_from_map (ldm, info->interp_plt_sect_low); | |
875 | info->interp_plt_sect_high = | |
876 | info->interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
877 | } | |
878 | ||
3582629f YQ |
879 | addr = gdb_bfd_lookup_symbol (tmp_bfd, cmp_name, "_dl_debug_state"); |
880 | if (addr != 0) | |
8cd64e00 | 881 | { |
3582629f YQ |
882 | if (solib_dsbt_debug) |
883 | fprintf_unfiltered (gdb_stdlog, | |
884 | "enable_break: _dl_debug_state (prior to relocation) = %s\n", | |
885 | hex_string_custom (addr, 8)); | |
886 | addr += displacement_from_map (ldm, addr); | |
8cd64e00 | 887 | |
3582629f YQ |
888 | if (solib_dsbt_debug) |
889 | fprintf_unfiltered (gdb_stdlog, | |
890 | "enable_break: _dl_debug_state (after relocation) = %s\n", | |
891 | hex_string_custom (addr, 8)); | |
8cd64e00 | 892 | |
3582629f YQ |
893 | /* Now (finally!) create the solib breakpoint. */ |
894 | create_solib_event_breakpoint (target_gdbarch (), addr); | |
8cd64e00 | 895 | |
3582629f | 896 | ret = 1; |
8cd64e00 | 897 | } |
3582629f | 898 | else |
8cd64e00 YQ |
899 | { |
900 | if (solib_dsbt_debug) | |
901 | fprintf_unfiltered (gdb_stdlog, | |
3582629f YQ |
902 | "enable_break: _dl_debug_state is not found\n"); |
903 | ret = 0; | |
8cd64e00 YQ |
904 | } |
905 | ||
8cd64e00 | 906 | /* We're done with the temporary bfd. */ |
cbb099e8 | 907 | gdb_bfd_unref (tmp_bfd); |
8cd64e00 YQ |
908 | |
909 | /* We're also done with the loadmap. */ | |
910 | xfree (ldm); | |
911 | ||
3582629f | 912 | return ret; |
8cd64e00 YQ |
913 | } |
914 | ||
915 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ | |
916 | enable_break_failure_warning (); | |
917 | ||
918 | /* Failure return. */ | |
919 | return 0; | |
920 | } | |
921 | ||
8cd64e00 YQ |
922 | /* Once the symbols from a shared object have been loaded in the usual |
923 | way, we are called to do any system specific symbol handling that | |
924 | is needed. */ | |
925 | ||
926 | static void | |
927 | dsbt_special_symbol_handling (void) | |
928 | { | |
929 | } | |
930 | ||
931 | static void | |
932 | dsbt_relocate_main_executable (void) | |
933 | { | |
8cd64e00 YQ |
934 | struct int_elf32_dsbt_loadmap *ldm; |
935 | struct cleanup *old_chain; | |
936 | struct section_offsets *new_offsets; | |
937 | int changed; | |
938 | struct obj_section *osect; | |
939 | struct dsbt_info *info = get_dsbt_info (); | |
940 | ||
941 | dsbt_get_initial_loadmaps (); | |
942 | ldm = info->exec_loadmap; | |
943 | ||
944 | xfree (info->main_executable_lm_info); | |
8d749320 | 945 | info->main_executable_lm_info = XCNEW (struct lm_info); |
8cd64e00 YQ |
946 | info->main_executable_lm_info->map = ldm; |
947 | ||
224c3ddb SM |
948 | new_offsets = XCNEWVEC (struct section_offsets, |
949 | symfile_objfile->num_sections); | |
8cd64e00 YQ |
950 | old_chain = make_cleanup (xfree, new_offsets); |
951 | changed = 0; | |
952 | ||
953 | ALL_OBJFILE_OSECTIONS (symfile_objfile, osect) | |
954 | { | |
955 | CORE_ADDR orig_addr, addr, offset; | |
956 | int osect_idx; | |
957 | int seg; | |
958 | ||
65cf3563 | 959 | osect_idx = osect - symfile_objfile->sections; |
8cd64e00 YQ |
960 | |
961 | /* Current address of section. */ | |
962 | addr = obj_section_addr (osect); | |
963 | /* Offset from where this section started. */ | |
964 | offset = ANOFFSET (symfile_objfile->section_offsets, osect_idx); | |
965 | /* Original address prior to any past relocations. */ | |
966 | orig_addr = addr - offset; | |
967 | ||
968 | for (seg = 0; seg < ldm->nsegs; seg++) | |
969 | { | |
970 | if (ldm->segs[seg].p_vaddr <= orig_addr | |
971 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) | |
972 | { | |
973 | new_offsets->offsets[osect_idx] | |
974 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; | |
975 | ||
976 | if (new_offsets->offsets[osect_idx] != offset) | |
977 | changed = 1; | |
978 | break; | |
979 | } | |
980 | } | |
981 | } | |
982 | ||
983 | if (changed) | |
984 | objfile_relocate (symfile_objfile, new_offsets); | |
985 | ||
986 | do_cleanups (old_chain); | |
987 | ||
988 | /* Now that symfile_objfile has been relocated, we can compute the | |
989 | GOT value and stash it away. */ | |
990 | } | |
991 | ||
992 | /* When gdb starts up the inferior, it nurses it along (through the | |
993 | shell) until it is ready to execute it's first instruction. At this | |
4d1eb6b4 | 994 | point, this function gets called via solib_create_inferior_hook. |
8cd64e00 YQ |
995 | |
996 | For the DSBT shared library, the main executable needs to be relocated. | |
4d1eb6b4 | 997 | The shared library breakpoints also need to be enabled. */ |
8cd64e00 YQ |
998 | |
999 | static void | |
1000 | dsbt_solib_create_inferior_hook (int from_tty) | |
1001 | { | |
1002 | /* Relocate main executable. */ | |
1003 | dsbt_relocate_main_executable (); | |
1004 | ||
1005 | /* Enable shared library breakpoints. */ | |
1006 | if (!enable_break ()) | |
1007 | { | |
1008 | warning (_("shared library handler failed to enable breakpoint")); | |
1009 | return; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | static void | |
1014 | dsbt_clear_solib (void) | |
1015 | { | |
1016 | struct dsbt_info *info = get_dsbt_info (); | |
1017 | ||
1018 | info->lm_base_cache = 0; | |
8cd64e00 YQ |
1019 | info->main_lm_addr = 0; |
1020 | if (info->main_executable_lm_info != 0) | |
1021 | { | |
1022 | xfree (info->main_executable_lm_info->map); | |
1023 | xfree (info->main_executable_lm_info); | |
1024 | info->main_executable_lm_info = 0; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | static void | |
1029 | dsbt_free_so (struct so_list *so) | |
1030 | { | |
1031 | xfree (so->lm_info->map); | |
1032 | xfree (so->lm_info); | |
1033 | } | |
1034 | ||
1035 | static void | |
1036 | dsbt_relocate_section_addresses (struct so_list *so, | |
7ee4732a | 1037 | struct target_section *sec) |
8cd64e00 YQ |
1038 | { |
1039 | int seg; | |
1040 | struct int_elf32_dsbt_loadmap *map; | |
1041 | ||
1042 | map = so->lm_info->map; | |
1043 | ||
1044 | for (seg = 0; seg < map->nsegs; seg++) | |
1045 | { | |
1046 | if (map->segs[seg].p_vaddr <= sec->addr | |
7ee4732a | 1047 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) |
8cd64e00 YQ |
1048 | { |
1049 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; | |
1050 | ||
1051 | sec->addr += displ; | |
1052 | sec->endaddr += displ; | |
1053 | break; | |
1054 | } | |
1055 | } | |
1056 | } | |
1057 | static void | |
1058 | show_dsbt_debug (struct ui_file *file, int from_tty, | |
1059 | struct cmd_list_element *c, const char *value) | |
1060 | { | |
1061 | fprintf_filtered (file, _("solib-dsbt debugging is %s.\n"), value); | |
1062 | } | |
1063 | ||
1064 | struct target_so_ops dsbt_so_ops; | |
1065 | ||
1066 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
1067 | extern initialize_file_ftype _initialize_dsbt_solib; | |
1068 | ||
1069 | void | |
1070 | _initialize_dsbt_solib (void) | |
1071 | { | |
1072 | solib_dsbt_pspace_data | |
8e260fc0 | 1073 | = register_program_space_data_with_cleanup (NULL, dsbt_pspace_data_cleanup); |
8cd64e00 YQ |
1074 | |
1075 | dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses; | |
1076 | dsbt_so_ops.free_so = dsbt_free_so; | |
1077 | dsbt_so_ops.clear_solib = dsbt_clear_solib; | |
1078 | dsbt_so_ops.solib_create_inferior_hook = dsbt_solib_create_inferior_hook; | |
1079 | dsbt_so_ops.special_symbol_handling = dsbt_special_symbol_handling; | |
1080 | dsbt_so_ops.current_sos = dsbt_current_sos; | |
1081 | dsbt_so_ops.open_symbol_file_object = open_symbol_file_object; | |
1082 | dsbt_so_ops.in_dynsym_resolve_code = dsbt_in_dynsym_resolve_code; | |
1083 | dsbt_so_ops.bfd_open = solib_bfd_open; | |
1084 | ||
1085 | /* Debug this file's internals. */ | |
ccce17b0 YQ |
1086 | add_setshow_zuinteger_cmd ("solib-dsbt", class_maintenance, |
1087 | &solib_dsbt_debug, _("\ | |
8cd64e00 YQ |
1088 | Set internal debugging of shared library code for DSBT ELF."), _("\ |
1089 | Show internal debugging of shared library code for DSBT ELF."), _("\ | |
1090 | When non-zero, DSBT solib specific internal debugging is enabled."), | |
ccce17b0 YQ |
1091 | NULL, |
1092 | show_dsbt_debug, | |
1093 | &setdebuglist, &showdebuglist); | |
8cd64e00 | 1094 | } |