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c4d10515 | 1 | /* Handle FR-V (FDPIC) shared libraries for GDB, the GNU Debugger. |
618f726f | 2 | Copyright (C) 2004-2016 Free Software Foundation, Inc. |
c4d10515 KB |
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 | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
c4d10515 KB |
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 | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c4d10515 KB |
18 | |
19 | ||
20 | #include "defs.h" | |
c4d10515 KB |
21 | #include "inferior.h" |
22 | #include "gdbcore.h" | |
cb5c8c39 | 23 | #include "solib.h" |
c4d10515 KB |
24 | #include "solist.h" |
25 | #include "frv-tdep.h" | |
26 | #include "objfiles.h" | |
27 | #include "symtab.h" | |
28 | #include "language.h" | |
29 | #include "command.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "elf/frv.h" | |
cbb099e8 | 32 | #include "gdb_bfd.h" |
c4d10515 KB |
33 | |
34 | /* Flag which indicates whether internal debug messages should be printed. */ | |
ccce17b0 | 35 | static unsigned int solib_frv_debug; |
c4d10515 KB |
36 | |
37 | /* FR-V pointers are four bytes wide. */ | |
38 | enum { FRV_PTR_SIZE = 4 }; | |
39 | ||
40 | /* Representation of loadmap and related structs for the FR-V FDPIC ABI. */ | |
41 | ||
42 | /* External versions; the size and alignment of the fields should be | |
43 | the same as those on the target. When loaded, the placement of | |
44 | the bits in each field will be the same as on the target. */ | |
e2b7c966 KB |
45 | typedef gdb_byte ext_Elf32_Half[2]; |
46 | typedef gdb_byte ext_Elf32_Addr[4]; | |
47 | typedef gdb_byte ext_Elf32_Word[4]; | |
c4d10515 KB |
48 | |
49 | struct ext_elf32_fdpic_loadseg | |
50 | { | |
51 | /* Core address to which the segment is mapped. */ | |
52 | ext_Elf32_Addr addr; | |
53 | /* VMA recorded in the program header. */ | |
54 | ext_Elf32_Addr p_vaddr; | |
55 | /* Size of this segment in memory. */ | |
56 | ext_Elf32_Word p_memsz; | |
57 | }; | |
58 | ||
59 | struct ext_elf32_fdpic_loadmap { | |
60 | /* Protocol version number, must be zero. */ | |
61 | ext_Elf32_Half version; | |
62 | /* Number of segments in this map. */ | |
63 | ext_Elf32_Half nsegs; | |
64 | /* The actual memory map. */ | |
65 | struct ext_elf32_fdpic_loadseg segs[1 /* nsegs, actually */]; | |
66 | }; | |
67 | ||
68 | /* Internal versions; the types are GDB types and the data in each | |
69 | of the fields is (or will be) decoded from the external struct | |
70 | for ease of consumption. */ | |
71 | struct int_elf32_fdpic_loadseg | |
72 | { | |
73 | /* Core address to which the segment is mapped. */ | |
74 | CORE_ADDR addr; | |
75 | /* VMA recorded in the program header. */ | |
76 | CORE_ADDR p_vaddr; | |
77 | /* Size of this segment in memory. */ | |
78 | long p_memsz; | |
79 | }; | |
80 | ||
81 | struct int_elf32_fdpic_loadmap { | |
82 | /* Protocol version number, must be zero. */ | |
83 | int version; | |
84 | /* Number of segments in this map. */ | |
85 | int nsegs; | |
86 | /* The actual memory map. */ | |
87 | struct int_elf32_fdpic_loadseg segs[1 /* nsegs, actually */]; | |
88 | }; | |
89 | ||
90 | /* Given address LDMADDR, fetch and decode the loadmap at that address. | |
91 | Return NULL if there is a problem reading the target memory or if | |
92 | there doesn't appear to be a loadmap at the given address. The | |
93 | allocated space (representing the loadmap) returned by this | |
94 | function may be freed via a single call to xfree(). */ | |
95 | ||
96 | static struct int_elf32_fdpic_loadmap * | |
97 | fetch_loadmap (CORE_ADDR ldmaddr) | |
98 | { | |
f5656ead | 99 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
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100 | struct ext_elf32_fdpic_loadmap ext_ldmbuf_partial; |
101 | struct ext_elf32_fdpic_loadmap *ext_ldmbuf; | |
102 | struct int_elf32_fdpic_loadmap *int_ldmbuf; | |
103 | int ext_ldmbuf_size, int_ldmbuf_size; | |
104 | int version, seg, nsegs; | |
105 | ||
106 | /* Fetch initial portion of the loadmap. */ | |
e2b7c966 | 107 | if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial, |
c4d10515 KB |
108 | sizeof ext_ldmbuf_partial)) |
109 | { | |
110 | /* Problem reading the target's memory. */ | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | /* Extract the version. */ | |
e2b7c966 | 115 | version = extract_unsigned_integer (ext_ldmbuf_partial.version, |
e17a4113 UW |
116 | sizeof ext_ldmbuf_partial.version, |
117 | byte_order); | |
c4d10515 KB |
118 | if (version != 0) |
119 | { | |
120 | /* We only handle version 0. */ | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | /* Extract the number of segments. */ | |
e2b7c966 | 125 | nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs, |
e17a4113 UW |
126 | sizeof ext_ldmbuf_partial.nsegs, |
127 | byte_order); | |
c4d10515 | 128 | |
9bc7b6c6 KB |
129 | if (nsegs <= 0) |
130 | return NULL; | |
131 | ||
c4d10515 KB |
132 | /* Allocate space for the complete (external) loadmap. */ |
133 | ext_ldmbuf_size = sizeof (struct ext_elf32_fdpic_loadmap) | |
134 | + (nsegs - 1) * sizeof (struct ext_elf32_fdpic_loadseg); | |
224c3ddb | 135 | ext_ldmbuf = (struct ext_elf32_fdpic_loadmap *) xmalloc (ext_ldmbuf_size); |
c4d10515 KB |
136 | |
137 | /* Copy over the portion of the loadmap that's already been read. */ | |
138 | memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial); | |
139 | ||
140 | /* Read the rest of the loadmap from the target. */ | |
141 | if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial, | |
e2b7c966 | 142 | (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial, |
c4d10515 KB |
143 | ext_ldmbuf_size - sizeof ext_ldmbuf_partial)) |
144 | { | |
145 | /* Couldn't read rest of the loadmap. */ | |
146 | xfree (ext_ldmbuf); | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | /* Allocate space into which to put information extract from the | |
151 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
152 | int_ldmbuf_size = sizeof (struct int_elf32_fdpic_loadmap) | |
153 | + (nsegs - 1) * sizeof (struct int_elf32_fdpic_loadseg); | |
224c3ddb | 154 | int_ldmbuf = (struct int_elf32_fdpic_loadmap *) xmalloc (int_ldmbuf_size); |
c4d10515 KB |
155 | |
156 | /* Place extracted information in internal structs. */ | |
157 | int_ldmbuf->version = version; | |
158 | int_ldmbuf->nsegs = nsegs; | |
159 | for (seg = 0; seg < nsegs; seg++) | |
160 | { | |
161 | int_ldmbuf->segs[seg].addr | |
e2b7c966 | 162 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, |
e17a4113 UW |
163 | sizeof (ext_ldmbuf->segs[seg].addr), |
164 | byte_order); | |
c4d10515 | 165 | int_ldmbuf->segs[seg].p_vaddr |
e2b7c966 | 166 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, |
e17a4113 UW |
167 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), |
168 | byte_order); | |
c4d10515 | 169 | int_ldmbuf->segs[seg].p_memsz |
e2b7c966 | 170 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, |
e17a4113 UW |
171 | sizeof (ext_ldmbuf->segs[seg].p_memsz), |
172 | byte_order); | |
c4d10515 KB |
173 | } |
174 | ||
d5c560f7 | 175 | xfree (ext_ldmbuf); |
c4d10515 KB |
176 | return int_ldmbuf; |
177 | } | |
178 | ||
179 | /* External link_map and elf32_fdpic_loadaddr struct definitions. */ | |
180 | ||
e2b7c966 | 181 | typedef gdb_byte ext_ptr[4]; |
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182 | |
183 | struct ext_elf32_fdpic_loadaddr | |
184 | { | |
185 | ext_ptr map; /* struct elf32_fdpic_loadmap *map; */ | |
186 | ext_ptr got_value; /* void *got_value; */ | |
187 | }; | |
188 | ||
189 | struct ext_link_map | |
190 | { | |
191 | struct ext_elf32_fdpic_loadaddr l_addr; | |
192 | ||
193 | /* Absolute file name object was found in. */ | |
194 | ext_ptr l_name; /* char *l_name; */ | |
195 | ||
196 | /* Dynamic section of the shared object. */ | |
197 | ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */ | |
198 | ||
199 | /* Chain of loaded objects. */ | |
200 | ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */ | |
201 | }; | |
202 | ||
c378eb4e | 203 | /* Link map info to include in an allocated so_list entry. */ |
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204 | |
205 | struct lm_info | |
206 | { | |
207 | /* The loadmap, digested into an easier to use form. */ | |
208 | struct int_elf32_fdpic_loadmap *map; | |
209 | /* The GOT address for this link map entry. */ | |
210 | CORE_ADDR got_value; | |
186993b4 KB |
211 | /* The link map address, needed for frv_fetch_objfile_link_map(). */ |
212 | CORE_ADDR lm_addr; | |
c4d10515 KB |
213 | |
214 | /* Cached dynamic symbol table and dynamic relocs initialized and | |
215 | used only by find_canonical_descriptor_in_load_object(). | |
216 | ||
217 | Note: kevinb/2004-02-26: It appears that calls to | |
218 | bfd_canonicalize_dynamic_reloc() will use the same symbols as | |
219 | those supplied to the first call to this function. Therefore, | |
220 | it's important to NOT free the asymbol ** data structure | |
221 | supplied to the first call. Thus the caching of the dynamic | |
222 | symbols (dyn_syms) is critical for correct operation. The | |
223 | caching of the dynamic relocations could be dispensed with. */ | |
224 | asymbol **dyn_syms; | |
225 | arelent **dyn_relocs; | |
c378eb4e | 226 | int dyn_reloc_count; /* Number of dynamic relocs. */ |
c4d10515 KB |
227 | |
228 | }; | |
229 | ||
230 | /* The load map, got value, etc. are not available from the chain | |
231 | of loaded shared objects. ``main_executable_lm_info'' provides | |
232 | a way to get at this information so that it doesn't need to be | |
233 | frequently recomputed. Initialized by frv_relocate_main_executable(). */ | |
234 | static struct lm_info *main_executable_lm_info; | |
235 | ||
236 | static void frv_relocate_main_executable (void); | |
237 | static CORE_ADDR main_got (void); | |
238 | static int enable_break2 (void); | |
239 | ||
7f86f058 | 240 | /* Implement the "open_symbol_file_object" target_so_ops method. */ |
c4d10515 KB |
241 | |
242 | static int | |
243 | open_symbol_file_object (void *from_ttyp) | |
244 | { | |
245 | /* Unimplemented. */ | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* Cached value for lm_base(), below. */ | |
250 | static CORE_ADDR lm_base_cache = 0; | |
251 | ||
186993b4 KB |
252 | /* Link map address for main module. */ |
253 | static CORE_ADDR main_lm_addr = 0; | |
254 | ||
c4d10515 KB |
255 | /* Return the address from which the link map chain may be found. On |
256 | the FR-V, this may be found in a number of ways. Assuming that the | |
257 | main executable has already been relocated, the easiest way to find | |
258 | this value is to look up the address of _GLOBAL_OFFSET_TABLE_. A | |
259 | pointer to the start of the link map will be located at the word found | |
260 | at _GLOBAL_OFFSET_TABLE_ + 8. (This is part of the dynamic linker | |
261 | reserve area mandated by the ABI.) */ | |
262 | ||
263 | static CORE_ADDR | |
264 | lm_base (void) | |
265 | { | |
f5656ead | 266 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
3b7344d5 | 267 | struct bound_minimal_symbol got_sym; |
c4d10515 | 268 | CORE_ADDR addr; |
e2b7c966 | 269 | gdb_byte buf[FRV_PTR_SIZE]; |
c4d10515 | 270 | |
89a7ee67 KB |
271 | /* One of our assumptions is that the main executable has been relocated. |
272 | Bail out if this has not happened. (Note that post_create_inferior() | |
273 | in infcmd.c will call solib_add prior to solib_create_inferior_hook(). | |
274 | If we allow this to happen, lm_base_cache will be initialized with | |
275 | a bogus value. */ | |
276 | if (main_executable_lm_info == 0) | |
277 | return 0; | |
278 | ||
c4d10515 KB |
279 | /* If we already have a cached value, return it. */ |
280 | if (lm_base_cache) | |
281 | return lm_base_cache; | |
282 | ||
283 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, | |
284 | symfile_objfile); | |
3b7344d5 | 285 | if (got_sym.minsym == 0) |
c4d10515 KB |
286 | { |
287 | if (solib_frv_debug) | |
288 | fprintf_unfiltered (gdb_stdlog, | |
289 | "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n"); | |
290 | return 0; | |
291 | } | |
292 | ||
77e371c0 | 293 | addr = BMSYMBOL_VALUE_ADDRESS (got_sym) + 8; |
c4d10515 KB |
294 | |
295 | if (solib_frv_debug) | |
296 | fprintf_unfiltered (gdb_stdlog, | |
297 | "lm_base: _GLOBAL_OFFSET_TABLE_ + 8 = %s\n", | |
bb599908 | 298 | hex_string_custom (addr, 8)); |
c4d10515 KB |
299 | |
300 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
301 | return 0; | |
e17a4113 | 302 | lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 KB |
303 | |
304 | if (solib_frv_debug) | |
305 | fprintf_unfiltered (gdb_stdlog, | |
306 | "lm_base: lm_base_cache = %s\n", | |
bb599908 | 307 | hex_string_custom (lm_base_cache, 8)); |
c4d10515 KB |
308 | |
309 | return lm_base_cache; | |
310 | } | |
311 | ||
312 | ||
7f86f058 | 313 | /* Implement the "current_sos" target_so_ops method. */ |
c4d10515 KB |
314 | |
315 | static struct so_list * | |
316 | frv_current_sos (void) | |
317 | { | |
f5656ead | 318 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
319 | CORE_ADDR lm_addr, mgot; |
320 | struct so_list *sos_head = NULL; | |
321 | struct so_list **sos_next_ptr = &sos_head; | |
322 | ||
7c699b81 KB |
323 | /* Make sure that the main executable has been relocated. This is |
324 | required in order to find the address of the global offset table, | |
325 | which in turn is used to find the link map info. (See lm_base() | |
326 | for details.) | |
327 | ||
328 | Note that the relocation of the main executable is also performed | |
4d1eb6b4 | 329 | by solib_create_inferior_hook(), however, in the case of core |
7c699b81 | 330 | files, this hook is called too late in order to be of benefit to |
4d1eb6b4 | 331 | solib_add. solib_add eventually calls this this function, |
7c699b81 | 332 | frv_current_sos, and also precedes the call to |
4d1eb6b4 | 333 | solib_create_inferior_hook(). (See post_create_inferior() in |
7c699b81 KB |
334 | infcmd.c.) */ |
335 | if (main_executable_lm_info == 0 && core_bfd != NULL) | |
336 | frv_relocate_main_executable (); | |
337 | ||
338 | /* Fetch the GOT corresponding to the main executable. */ | |
c4d10515 KB |
339 | mgot = main_got (); |
340 | ||
341 | /* Locate the address of the first link map struct. */ | |
342 | lm_addr = lm_base (); | |
343 | ||
b021a221 | 344 | /* We have at least one link map entry. Fetch the lot of them, |
c4d10515 KB |
345 | building the solist chain. */ |
346 | while (lm_addr) | |
347 | { | |
348 | struct ext_link_map lm_buf; | |
349 | CORE_ADDR got_addr; | |
350 | ||
351 | if (solib_frv_debug) | |
352 | fprintf_unfiltered (gdb_stdlog, | |
353 | "current_sos: reading link_map entry at %s\n", | |
bb599908 | 354 | hex_string_custom (lm_addr, 8)); |
c4d10515 | 355 | |
3e43a32a MS |
356 | if (target_read_memory (lm_addr, (gdb_byte *) &lm_buf, |
357 | sizeof (lm_buf)) != 0) | |
c4d10515 | 358 | { |
3e43a32a MS |
359 | warning (_("frv_current_sos: Unable to read link map entry. " |
360 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
361 | break; |
362 | } | |
363 | ||
364 | got_addr | |
e2b7c966 | 365 | = extract_unsigned_integer (lm_buf.l_addr.got_value, |
e17a4113 UW |
366 | sizeof (lm_buf.l_addr.got_value), |
367 | byte_order); | |
c4d10515 KB |
368 | /* If the got_addr is the same as mgotr, then we're looking at the |
369 | entry for the main executable. By convention, we don't include | |
370 | this in the list of shared objects. */ | |
371 | if (got_addr != mgot) | |
372 | { | |
373 | int errcode; | |
374 | char *name_buf; | |
375 | struct int_elf32_fdpic_loadmap *loadmap; | |
376 | struct so_list *sop; | |
377 | CORE_ADDR addr; | |
378 | ||
379 | /* Fetch the load map address. */ | |
e2b7c966 | 380 | addr = extract_unsigned_integer (lm_buf.l_addr.map, |
e17a4113 UW |
381 | sizeof lm_buf.l_addr.map, |
382 | byte_order); | |
c4d10515 KB |
383 | loadmap = fetch_loadmap (addr); |
384 | if (loadmap == NULL) | |
385 | { | |
3e43a32a MS |
386 | warning (_("frv_current_sos: Unable to fetch load map. " |
387 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
388 | break; |
389 | } | |
390 | ||
8d749320 SM |
391 | sop = XCNEW (struct so_list); |
392 | sop->lm_info = XCNEW (struct lm_info); | |
c4d10515 KB |
393 | sop->lm_info->map = loadmap; |
394 | sop->lm_info->got_value = got_addr; | |
186993b4 | 395 | sop->lm_info->lm_addr = lm_addr; |
c4d10515 | 396 | /* Fetch the name. */ |
e2b7c966 | 397 | addr = extract_unsigned_integer (lm_buf.l_name, |
e17a4113 UW |
398 | sizeof (lm_buf.l_name), |
399 | byte_order); | |
c4d10515 KB |
400 | target_read_string (addr, &name_buf, SO_NAME_MAX_PATH_SIZE - 1, |
401 | &errcode); | |
402 | ||
403 | if (solib_frv_debug) | |
404 | fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n", | |
405 | name_buf); | |
406 | ||
407 | if (errcode != 0) | |
8a3fe4f8 AC |
408 | warning (_("Can't read pathname for link map entry: %s."), |
409 | safe_strerror (errcode)); | |
c4d10515 KB |
410 | else |
411 | { | |
412 | strncpy (sop->so_name, name_buf, SO_NAME_MAX_PATH_SIZE - 1); | |
413 | sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; | |
414 | xfree (name_buf); | |
415 | strcpy (sop->so_original_name, sop->so_name); | |
416 | } | |
417 | ||
418 | *sos_next_ptr = sop; | |
419 | sos_next_ptr = &sop->next; | |
420 | } | |
186993b4 KB |
421 | else |
422 | { | |
423 | main_lm_addr = lm_addr; | |
424 | } | |
c4d10515 | 425 | |
e17a4113 UW |
426 | lm_addr = extract_unsigned_integer (lm_buf.l_next, |
427 | sizeof (lm_buf.l_next), byte_order); | |
c4d10515 KB |
428 | } |
429 | ||
430 | enable_break2 (); | |
431 | ||
432 | return sos_head; | |
433 | } | |
434 | ||
435 | ||
436 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
437 | run time loader. */ | |
438 | ||
439 | static CORE_ADDR interp_text_sect_low; | |
440 | static CORE_ADDR interp_text_sect_high; | |
441 | static CORE_ADDR interp_plt_sect_low; | |
442 | static CORE_ADDR interp_plt_sect_high; | |
443 | ||
444 | static int | |
445 | frv_in_dynsym_resolve_code (CORE_ADDR pc) | |
446 | { | |
447 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
448 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
3e5d3a5a | 449 | || in_plt_section (pc)); |
c4d10515 KB |
450 | } |
451 | ||
452 | /* Given a loadmap and an address, return the displacement needed | |
453 | to relocate the address. */ | |
454 | ||
63807e1d | 455 | static CORE_ADDR |
c4d10515 KB |
456 | displacement_from_map (struct int_elf32_fdpic_loadmap *map, |
457 | CORE_ADDR addr) | |
458 | { | |
459 | int seg; | |
460 | ||
461 | for (seg = 0; seg < map->nsegs; seg++) | |
462 | { | |
463 | if (map->segs[seg].p_vaddr <= addr | |
464 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
465 | { | |
466 | return map->segs[seg].addr - map->segs[seg].p_vaddr; | |
467 | } | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | /* Print a warning about being unable to set the dynamic linker | |
474 | breakpoint. */ | |
475 | ||
476 | static void | |
477 | enable_break_failure_warning (void) | |
478 | { | |
8a3fe4f8 | 479 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
c4d10515 | 480 | "GDB will be unable to debug shared library initializers\n" |
8a3fe4f8 | 481 | "and track explicitly loaded dynamic code.")); |
c4d10515 KB |
482 | } |
483 | ||
cb457ae2 YQ |
484 | /* Helper function for gdb_bfd_lookup_symbol. */ |
485 | ||
486 | static int | |
3953f15c | 487 | cmp_name (const asymbol *sym, const void *data) |
cb457ae2 YQ |
488 | { |
489 | return (strcmp (sym->name, (const char *) data) == 0); | |
490 | } | |
491 | ||
7f86f058 | 492 | /* Arrange for dynamic linker to hit breakpoint. |
c4d10515 KB |
493 | |
494 | The dynamic linkers has, as part of its debugger interface, support | |
495 | for arranging for the inferior to hit a breakpoint after mapping in | |
496 | the shared libraries. This function enables that breakpoint. | |
497 | ||
498 | On the FR-V, using the shared library (FDPIC) ABI, the symbol | |
499 | _dl_debug_addr points to the r_debug struct which contains | |
500 | a field called r_brk. r_brk is the address of the function | |
501 | descriptor upon which a breakpoint must be placed. Being a | |
502 | function descriptor, we must extract the entry point in order | |
503 | to set the breakpoint. | |
504 | ||
505 | Our strategy will be to get the .interp section from the | |
506 | executable. This section will provide us with the name of the | |
507 | interpreter. We'll open the interpreter and then look up | |
508 | the address of _dl_debug_addr. We then relocate this address | |
509 | using the interpreter's loadmap. Once the relocated address | |
510 | is known, we fetch the value (address) corresponding to r_brk | |
511 | and then use that value to fetch the entry point of the function | |
7f86f058 | 512 | we're interested in. */ |
c4d10515 | 513 | |
c4d10515 KB |
514 | static int enable_break2_done = 0; |
515 | ||
516 | static int | |
517 | enable_break2 (void) | |
518 | { | |
f5656ead | 519 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
520 | asection *interp_sect; |
521 | ||
cb7db0f2 | 522 | if (enable_break2_done) |
c4d10515 KB |
523 | return 1; |
524 | ||
c4d10515 KB |
525 | interp_text_sect_low = interp_text_sect_high = 0; |
526 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
527 | ||
528 | /* Find the .interp section; if not found, warn the user and drop | |
529 | into the old breakpoint at symbol code. */ | |
530 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
531 | if (interp_sect) | |
532 | { | |
533 | unsigned int interp_sect_size; | |
001f13d8 | 534 | char *buf; |
c4d10515 | 535 | bfd *tmp_bfd = NULL; |
c4d10515 KB |
536 | int status; |
537 | CORE_ADDR addr, interp_loadmap_addr; | |
e2b7c966 | 538 | gdb_byte addr_buf[FRV_PTR_SIZE]; |
c4d10515 KB |
539 | struct int_elf32_fdpic_loadmap *ldm; |
540 | ||
541 | /* Read the contents of the .interp section into a local buffer; | |
542 | the contents specify the dynamic linker this program uses. */ | |
543 | interp_sect_size = bfd_section_size (exec_bfd, interp_sect); | |
224c3ddb | 544 | buf = (char *) alloca (interp_sect_size); |
c4d10515 KB |
545 | bfd_get_section_contents (exec_bfd, interp_sect, |
546 | buf, 0, interp_sect_size); | |
547 | ||
548 | /* Now we need to figure out where the dynamic linker was | |
549 | loaded so that we can load its symbols and place a breakpoint | |
550 | in the dynamic linker itself. | |
551 | ||
552 | This address is stored on the stack. However, I've been unable | |
553 | to find any magic formula to find it for Solaris (appears to | |
554 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
555 | mechanism to find the dynamic linker's base address. */ | |
556 | ||
492d29ea | 557 | TRY |
f1838a98 UW |
558 | { |
559 | tmp_bfd = solib_bfd_open (buf); | |
560 | } | |
492d29ea PA |
561 | CATCH (ex, RETURN_MASK_ALL) |
562 | { | |
563 | } | |
564 | END_CATCH | |
565 | ||
c4d10515 KB |
566 | if (tmp_bfd == NULL) |
567 | { | |
568 | enable_break_failure_warning (); | |
569 | return 0; | |
570 | } | |
571 | ||
f5656ead | 572 | status = frv_fdpic_loadmap_addresses (target_gdbarch (), |
c4d10515 KB |
573 | &interp_loadmap_addr, 0); |
574 | if (status < 0) | |
575 | { | |
8a3fe4f8 | 576 | warning (_("Unable to determine dynamic linker loadmap address.")); |
c4d10515 | 577 | enable_break_failure_warning (); |
cbb099e8 | 578 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
579 | return 0; |
580 | } | |
581 | ||
582 | if (solib_frv_debug) | |
583 | fprintf_unfiltered (gdb_stdlog, | |
584 | "enable_break: interp_loadmap_addr = %s\n", | |
bb599908 | 585 | hex_string_custom (interp_loadmap_addr, 8)); |
c4d10515 KB |
586 | |
587 | ldm = fetch_loadmap (interp_loadmap_addr); | |
588 | if (ldm == NULL) | |
589 | { | |
8a3fe4f8 | 590 | warning (_("Unable to load dynamic linker loadmap at address %s."), |
bb599908 | 591 | hex_string_custom (interp_loadmap_addr, 8)); |
c4d10515 | 592 | enable_break_failure_warning (); |
cbb099e8 | 593 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
594 | return 0; |
595 | } | |
596 | ||
597 | /* Record the relocated start and end address of the dynamic linker | |
598 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
599 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".text"); | |
600 | if (interp_sect) | |
601 | { | |
602 | interp_text_sect_low | |
603 | = bfd_section_vma (tmp_bfd, interp_sect); | |
604 | interp_text_sect_low | |
605 | += displacement_from_map (ldm, interp_text_sect_low); | |
606 | interp_text_sect_high | |
607 | = interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
608 | } | |
609 | interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt"); | |
610 | if (interp_sect) | |
611 | { | |
612 | interp_plt_sect_low = | |
613 | bfd_section_vma (tmp_bfd, interp_sect); | |
614 | interp_plt_sect_low | |
615 | += displacement_from_map (ldm, interp_plt_sect_low); | |
616 | interp_plt_sect_high = | |
617 | interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect); | |
618 | } | |
619 | ||
cb457ae2 YQ |
620 | addr = gdb_bfd_lookup_symbol (tmp_bfd, cmp_name, "_dl_debug_addr"); |
621 | ||
c4d10515 KB |
622 | if (addr == 0) |
623 | { | |
3e43a32a MS |
624 | warning (_("Could not find symbol _dl_debug_addr " |
625 | "in dynamic linker")); | |
c4d10515 | 626 | enable_break_failure_warning (); |
cbb099e8 | 627 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
628 | return 0; |
629 | } | |
630 | ||
631 | if (solib_frv_debug) | |
632 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
633 | "enable_break: _dl_debug_addr " |
634 | "(prior to relocation) = %s\n", | |
bb599908 | 635 | hex_string_custom (addr, 8)); |
c4d10515 KB |
636 | |
637 | addr += displacement_from_map (ldm, addr); | |
638 | ||
639 | if (solib_frv_debug) | |
640 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
641 | "enable_break: _dl_debug_addr " |
642 | "(after relocation) = %s\n", | |
bb599908 | 643 | hex_string_custom (addr, 8)); |
c4d10515 KB |
644 | |
645 | /* Fetch the address of the r_debug struct. */ | |
646 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
647 | { | |
3e43a32a MS |
648 | warning (_("Unable to fetch contents of _dl_debug_addr " |
649 | "(at address %s) from dynamic linker"), | |
bb599908 | 650 | hex_string_custom (addr, 8)); |
c4d10515 | 651 | } |
e17a4113 | 652 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 | 653 | |
cb7db0f2 MF |
654 | if (solib_frv_debug) |
655 | fprintf_unfiltered (gdb_stdlog, | |
656 | "enable_break: _dl_debug_addr[0..3] = %s\n", | |
657 | hex_string_custom (addr, 8)); | |
658 | ||
659 | /* If it's zero, then the ldso hasn't initialized yet, and so | |
660 | there are no shared libs yet loaded. */ | |
661 | if (addr == 0) | |
662 | { | |
663 | if (solib_frv_debug) | |
664 | fprintf_unfiltered (gdb_stdlog, | |
665 | "enable_break: ldso not yet initialized\n"); | |
666 | /* Do not warn, but mark to run again. */ | |
667 | return 0; | |
668 | } | |
669 | ||
c4d10515 KB |
670 | /* Fetch the r_brk field. It's 8 bytes from the start of |
671 | _dl_debug_addr. */ | |
672 | if (target_read_memory (addr + 8, addr_buf, sizeof addr_buf) != 0) | |
673 | { | |
3e43a32a MS |
674 | warning (_("Unable to fetch _dl_debug_addr->r_brk " |
675 | "(at address %s) from dynamic linker"), | |
bb599908 | 676 | hex_string_custom (addr + 8, 8)); |
c4d10515 | 677 | enable_break_failure_warning (); |
cbb099e8 | 678 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
679 | return 0; |
680 | } | |
e17a4113 | 681 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 KB |
682 | |
683 | /* Now fetch the function entry point. */ | |
684 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
685 | { | |
3e43a32a MS |
686 | warning (_("Unable to fetch _dl_debug_addr->.r_brk entry point " |
687 | "(at address %s) from dynamic linker"), | |
bb599908 | 688 | hex_string_custom (addr, 8)); |
c4d10515 | 689 | enable_break_failure_warning (); |
cbb099e8 | 690 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
691 | return 0; |
692 | } | |
e17a4113 | 693 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 KB |
694 | |
695 | /* We're done with the temporary bfd. */ | |
cbb099e8 | 696 | gdb_bfd_unref (tmp_bfd); |
c4d10515 KB |
697 | |
698 | /* We're also done with the loadmap. */ | |
699 | xfree (ldm); | |
700 | ||
cb7db0f2 MF |
701 | /* Remove all the solib event breakpoints. Their addresses |
702 | may have changed since the last time we ran the program. */ | |
703 | remove_solib_event_breakpoints (); | |
704 | ||
c4d10515 | 705 | /* Now (finally!) create the solib breakpoint. */ |
f5656ead | 706 | create_solib_event_breakpoint (target_gdbarch (), addr); |
c4d10515 | 707 | |
cb7db0f2 MF |
708 | enable_break2_done = 1; |
709 | ||
c4d10515 KB |
710 | return 1; |
711 | } | |
712 | ||
713 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ | |
714 | enable_break_failure_warning (); | |
715 | ||
716 | /* Failure return. */ | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static int | |
721 | enable_break (void) | |
722 | { | |
723 | asection *interp_sect; | |
d56e56aa | 724 | CORE_ADDR entry_point; |
c4d10515 | 725 | |
abd0a5fa | 726 | if (symfile_objfile == NULL) |
c4d10515 | 727 | { |
abd0a5fa JK |
728 | if (solib_frv_debug) |
729 | fprintf_unfiltered (gdb_stdlog, | |
730 | "enable_break: No symbol file found.\n"); | |
731 | return 0; | |
732 | } | |
c4d10515 | 733 | |
d56e56aa | 734 | if (!entry_point_address_query (&entry_point)) |
abd0a5fa | 735 | { |
c4d10515 KB |
736 | if (solib_frv_debug) |
737 | fprintf_unfiltered (gdb_stdlog, | |
abd0a5fa JK |
738 | "enable_break: Symbol file has no entry point.\n"); |
739 | return 0; | |
c4d10515 | 740 | } |
abd0a5fa JK |
741 | |
742 | /* Check for the presence of a .interp section. If there is no | |
743 | such section, the executable is statically linked. */ | |
744 | ||
745 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
746 | ||
747 | if (interp_sect == NULL) | |
c4d10515 KB |
748 | { |
749 | if (solib_frv_debug) | |
750 | fprintf_unfiltered (gdb_stdlog, | |
abd0a5fa JK |
751 | "enable_break: No .interp section found.\n"); |
752 | return 0; | |
c4d10515 KB |
753 | } |
754 | ||
d56e56aa | 755 | create_solib_event_breakpoint (target_gdbarch (), entry_point); |
abd0a5fa JK |
756 | |
757 | if (solib_frv_debug) | |
758 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
759 | "enable_break: solib event breakpoint " |
760 | "placed at entry point: %s\n", | |
d56e56aa | 761 | hex_string_custom (entry_point, 8)); |
c4d10515 KB |
762 | return 1; |
763 | } | |
764 | ||
c4d10515 KB |
765 | static void |
766 | frv_relocate_main_executable (void) | |
767 | { | |
768 | int status; | |
9bc7b6c6 | 769 | CORE_ADDR exec_addr, interp_addr; |
c4d10515 KB |
770 | struct int_elf32_fdpic_loadmap *ldm; |
771 | struct cleanup *old_chain; | |
772 | struct section_offsets *new_offsets; | |
773 | int changed; | |
774 | struct obj_section *osect; | |
775 | ||
f5656ead | 776 | status = frv_fdpic_loadmap_addresses (target_gdbarch (), |
9bc7b6c6 | 777 | &interp_addr, &exec_addr); |
c4d10515 | 778 | |
9bc7b6c6 | 779 | if (status < 0 || (exec_addr == 0 && interp_addr == 0)) |
c4d10515 KB |
780 | { |
781 | /* Not using FDPIC ABI, so do nothing. */ | |
782 | return; | |
783 | } | |
784 | ||
785 | /* Fetch the loadmap located at ``exec_addr''. */ | |
786 | ldm = fetch_loadmap (exec_addr); | |
787 | if (ldm == NULL) | |
8a3fe4f8 | 788 | error (_("Unable to load the executable's loadmap.")); |
c4d10515 KB |
789 | |
790 | if (main_executable_lm_info) | |
791 | xfree (main_executable_lm_info); | |
8d749320 | 792 | main_executable_lm_info = XCNEW (struct lm_info); |
c4d10515 KB |
793 | main_executable_lm_info->map = ldm; |
794 | ||
224c3ddb SM |
795 | new_offsets = XCNEWVEC (struct section_offsets, |
796 | symfile_objfile->num_sections); | |
c4d10515 KB |
797 | old_chain = make_cleanup (xfree, new_offsets); |
798 | changed = 0; | |
799 | ||
800 | ALL_OBJFILE_OSECTIONS (symfile_objfile, osect) | |
801 | { | |
802 | CORE_ADDR orig_addr, addr, offset; | |
803 | int osect_idx; | |
804 | int seg; | |
805 | ||
65cf3563 | 806 | osect_idx = osect - symfile_objfile->sections; |
c4d10515 KB |
807 | |
808 | /* Current address of section. */ | |
aded6f54 | 809 | addr = obj_section_addr (osect); |
c4d10515 KB |
810 | /* Offset from where this section started. */ |
811 | offset = ANOFFSET (symfile_objfile->section_offsets, osect_idx); | |
812 | /* Original address prior to any past relocations. */ | |
813 | orig_addr = addr - offset; | |
814 | ||
815 | for (seg = 0; seg < ldm->nsegs; seg++) | |
816 | { | |
817 | if (ldm->segs[seg].p_vaddr <= orig_addr | |
818 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) | |
819 | { | |
820 | new_offsets->offsets[osect_idx] | |
821 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; | |
822 | ||
823 | if (new_offsets->offsets[osect_idx] != offset) | |
824 | changed = 1; | |
825 | break; | |
826 | } | |
827 | } | |
828 | } | |
829 | ||
830 | if (changed) | |
831 | objfile_relocate (symfile_objfile, new_offsets); | |
832 | ||
833 | do_cleanups (old_chain); | |
834 | ||
835 | /* Now that symfile_objfile has been relocated, we can compute the | |
836 | GOT value and stash it away. */ | |
837 | main_executable_lm_info->got_value = main_got (); | |
838 | } | |
839 | ||
7f86f058 | 840 | /* Implement the "create_inferior_hook" target_solib_ops method. |
c4d10515 | 841 | |
7f86f058 PA |
842 | For the FR-V shared library ABI (FDPIC), the main executable needs |
843 | to be relocated. The shared library breakpoints also need to be | |
844 | enabled. */ | |
c4d10515 KB |
845 | |
846 | static void | |
268a4a75 | 847 | frv_solib_create_inferior_hook (int from_tty) |
c4d10515 KB |
848 | { |
849 | /* Relocate main executable. */ | |
850 | frv_relocate_main_executable (); | |
851 | ||
852 | /* Enable shared library breakpoints. */ | |
853 | if (!enable_break ()) | |
854 | { | |
8a3fe4f8 | 855 | warning (_("shared library handler failed to enable breakpoint")); |
c4d10515 KB |
856 | return; |
857 | } | |
858 | } | |
859 | ||
860 | static void | |
861 | frv_clear_solib (void) | |
862 | { | |
863 | lm_base_cache = 0; | |
c4d10515 | 864 | enable_break2_done = 0; |
186993b4 | 865 | main_lm_addr = 0; |
7c699b81 KB |
866 | if (main_executable_lm_info != 0) |
867 | { | |
868 | xfree (main_executable_lm_info->map); | |
869 | xfree (main_executable_lm_info->dyn_syms); | |
870 | xfree (main_executable_lm_info->dyn_relocs); | |
871 | xfree (main_executable_lm_info); | |
872 | main_executable_lm_info = 0; | |
873 | } | |
c4d10515 KB |
874 | } |
875 | ||
876 | static void | |
877 | frv_free_so (struct so_list *so) | |
878 | { | |
879 | xfree (so->lm_info->map); | |
880 | xfree (so->lm_info->dyn_syms); | |
881 | xfree (so->lm_info->dyn_relocs); | |
882 | xfree (so->lm_info); | |
883 | } | |
884 | ||
885 | static void | |
886 | frv_relocate_section_addresses (struct so_list *so, | |
0542c86d | 887 | struct target_section *sec) |
c4d10515 KB |
888 | { |
889 | int seg; | |
890 | struct int_elf32_fdpic_loadmap *map; | |
891 | ||
892 | map = so->lm_info->map; | |
893 | ||
894 | for (seg = 0; seg < map->nsegs; seg++) | |
895 | { | |
896 | if (map->segs[seg].p_vaddr <= sec->addr | |
897 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
898 | { | |
899 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; | |
433759f7 | 900 | |
c4d10515 KB |
901 | sec->addr += displ; |
902 | sec->endaddr += displ; | |
903 | break; | |
904 | } | |
905 | } | |
906 | } | |
907 | ||
908 | /* Return the GOT address associated with the main executable. Return | |
909 | 0 if it can't be found. */ | |
910 | ||
911 | static CORE_ADDR | |
912 | main_got (void) | |
913 | { | |
3b7344d5 | 914 | struct bound_minimal_symbol got_sym; |
c4d10515 | 915 | |
3e43a32a MS |
916 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", |
917 | NULL, symfile_objfile); | |
3b7344d5 | 918 | if (got_sym.minsym == 0) |
c4d10515 KB |
919 | return 0; |
920 | ||
77e371c0 | 921 | return BMSYMBOL_VALUE_ADDRESS (got_sym); |
c4d10515 KB |
922 | } |
923 | ||
924 | /* Find the global pointer for the given function address ADDR. */ | |
925 | ||
926 | CORE_ADDR | |
927 | frv_fdpic_find_global_pointer (CORE_ADDR addr) | |
928 | { | |
929 | struct so_list *so; | |
930 | ||
931 | so = master_so_list (); | |
932 | while (so) | |
933 | { | |
934 | int seg; | |
935 | struct int_elf32_fdpic_loadmap *map; | |
936 | ||
937 | map = so->lm_info->map; | |
938 | ||
939 | for (seg = 0; seg < map->nsegs; seg++) | |
940 | { | |
941 | if (map->segs[seg].addr <= addr | |
942 | && addr < map->segs[seg].addr + map->segs[seg].p_memsz) | |
943 | return so->lm_info->got_value; | |
944 | } | |
945 | ||
946 | so = so->next; | |
947 | } | |
948 | ||
7a9dd1b2 | 949 | /* Didn't find it in any of the shared objects. So assume it's in the |
c4d10515 KB |
950 | main executable. */ |
951 | return main_got (); | |
952 | } | |
953 | ||
954 | /* Forward declarations for frv_fdpic_find_canonical_descriptor(). */ | |
955 | static CORE_ADDR find_canonical_descriptor_in_load_object | |
0d5cff50 | 956 | (CORE_ADDR, CORE_ADDR, const char *, bfd *, struct lm_info *); |
c4d10515 KB |
957 | |
958 | /* Given a function entry point, attempt to find the canonical descriptor | |
959 | associated with that entry point. Return 0 if no canonical descriptor | |
960 | could be found. */ | |
961 | ||
962 | CORE_ADDR | |
963 | frv_fdpic_find_canonical_descriptor (CORE_ADDR entry_point) | |
964 | { | |
0d5cff50 | 965 | const char *name; |
c4d10515 KB |
966 | CORE_ADDR addr; |
967 | CORE_ADDR got_value; | |
c4d10515 | 968 | struct symbol *sym; |
c4d10515 KB |
969 | |
970 | /* Fetch the corresponding global pointer for the entry point. */ | |
971 | got_value = frv_fdpic_find_global_pointer (entry_point); | |
972 | ||
973 | /* Attempt to find the name of the function. If the name is available, | |
974 | it'll be used as an aid in finding matching functions in the dynamic | |
975 | symbol table. */ | |
976 | sym = find_pc_function (entry_point); | |
977 | if (sym == 0) | |
978 | name = 0; | |
979 | else | |
980 | name = SYMBOL_LINKAGE_NAME (sym); | |
981 | ||
982 | /* Check the main executable. */ | |
983 | addr = find_canonical_descriptor_in_load_object | |
984 | (entry_point, got_value, name, symfile_objfile->obfd, | |
985 | main_executable_lm_info); | |
986 | ||
987 | /* If descriptor not found via main executable, check each load object | |
988 | in list of shared objects. */ | |
989 | if (addr == 0) | |
990 | { | |
991 | struct so_list *so; | |
992 | ||
993 | so = master_so_list (); | |
994 | while (so) | |
995 | { | |
996 | addr = find_canonical_descriptor_in_load_object | |
997 | (entry_point, got_value, name, so->abfd, so->lm_info); | |
998 | ||
999 | if (addr != 0) | |
1000 | break; | |
1001 | ||
1002 | so = so->next; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | return addr; | |
1007 | } | |
1008 | ||
1009 | static CORE_ADDR | |
1010 | find_canonical_descriptor_in_load_object | |
0d5cff50 | 1011 | (CORE_ADDR entry_point, CORE_ADDR got_value, const char *name, bfd *abfd, |
c4d10515 KB |
1012 | struct lm_info *lm) |
1013 | { | |
f5656ead | 1014 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
1015 | arelent *rel; |
1016 | unsigned int i; | |
1017 | CORE_ADDR addr = 0; | |
1018 | ||
1019 | /* Nothing to do if no bfd. */ | |
1020 | if (abfd == 0) | |
1021 | return 0; | |
1022 | ||
35e08e03 KB |
1023 | /* Nothing to do if no link map. */ |
1024 | if (lm == 0) | |
1025 | return 0; | |
1026 | ||
c4d10515 KB |
1027 | /* We want to scan the dynamic relocs for R_FRV_FUNCDESC relocations. |
1028 | (More about this later.) But in order to fetch the relocs, we | |
1029 | need to first fetch the dynamic symbols. These symbols need to | |
1030 | be cached due to the way that bfd_canonicalize_dynamic_reloc() | |
1031 | works. (See the comments in the declaration of struct lm_info | |
1032 | for more information.) */ | |
1033 | if (lm->dyn_syms == NULL) | |
1034 | { | |
1035 | long storage_needed; | |
1036 | unsigned int number_of_symbols; | |
1037 | ||
1038 | /* Determine amount of space needed to hold the dynamic symbol table. */ | |
1039 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
1040 | ||
1041 | /* If there are no dynamic symbols, there's nothing to do. */ | |
1042 | if (storage_needed <= 0) | |
1043 | return 0; | |
1044 | ||
1045 | /* Allocate space for the dynamic symbol table. */ | |
1046 | lm->dyn_syms = (asymbol **) xmalloc (storage_needed); | |
1047 | ||
1048 | /* Fetch the dynamic symbol table. */ | |
1049 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, lm->dyn_syms); | |
1050 | ||
1051 | if (number_of_symbols == 0) | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* Fetch the dynamic relocations if not already cached. */ | |
1056 | if (lm->dyn_relocs == NULL) | |
1057 | { | |
1058 | long storage_needed; | |
1059 | ||
1060 | /* Determine amount of space needed to hold the dynamic relocs. */ | |
1061 | storage_needed = bfd_get_dynamic_reloc_upper_bound (abfd); | |
1062 | ||
1063 | /* Bail out if there are no dynamic relocs. */ | |
1064 | if (storage_needed <= 0) | |
1065 | return 0; | |
1066 | ||
1067 | /* Allocate space for the relocs. */ | |
1068 | lm->dyn_relocs = (arelent **) xmalloc (storage_needed); | |
1069 | ||
1070 | /* Fetch the dynamic relocs. */ | |
1071 | lm->dyn_reloc_count | |
1072 | = bfd_canonicalize_dynamic_reloc (abfd, lm->dyn_relocs, lm->dyn_syms); | |
1073 | } | |
1074 | ||
1075 | /* Search the dynamic relocs. */ | |
1076 | for (i = 0; i < lm->dyn_reloc_count; i++) | |
1077 | { | |
1078 | rel = lm->dyn_relocs[i]; | |
1079 | ||
1080 | /* Relocs of interest are those which meet the following | |
1081 | criteria: | |
1082 | ||
1083 | - the names match (assuming the caller could provide | |
1084 | a name which matches ``entry_point''). | |
1085 | - the relocation type must be R_FRV_FUNCDESC. Relocs | |
1086 | of this type are used (by the dynamic linker) to | |
1087 | look up the address of a canonical descriptor (allocating | |
1088 | it if need be) and initializing the GOT entry referred | |
1089 | to by the offset to the address of the descriptor. | |
1090 | ||
1091 | These relocs of interest may be used to obtain a | |
1092 | candidate descriptor by first adjusting the reloc's | |
1093 | address according to the link map and then dereferencing | |
1094 | this address (which is a GOT entry) to obtain a descriptor | |
1095 | address. */ | |
1096 | if ((name == 0 || strcmp (name, (*rel->sym_ptr_ptr)->name) == 0) | |
1097 | && rel->howto->type == R_FRV_FUNCDESC) | |
1098 | { | |
e2b7c966 | 1099 | gdb_byte buf [FRV_PTR_SIZE]; |
c4d10515 KB |
1100 | |
1101 | /* Compute address of address of candidate descriptor. */ | |
1102 | addr = rel->address + displacement_from_map (lm->map, rel->address); | |
1103 | ||
1104 | /* Fetch address of candidate descriptor. */ | |
1105 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1106 | continue; | |
e17a4113 | 1107 | addr = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 KB |
1108 | |
1109 | /* Check for matching entry point. */ | |
1110 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1111 | continue; | |
e17a4113 UW |
1112 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1113 | != entry_point) | |
c4d10515 KB |
1114 | continue; |
1115 | ||
1116 | /* Check for matching got value. */ | |
1117 | if (target_read_memory (addr + 4, buf, sizeof buf) != 0) | |
1118 | continue; | |
e17a4113 UW |
1119 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1120 | != got_value) | |
c4d10515 KB |
1121 | continue; |
1122 | ||
1123 | /* Match was successful! Exit loop. */ | |
1124 | break; | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | return addr; | |
1129 | } | |
1130 | ||
186993b4 KB |
1131 | /* Given an objfile, return the address of its link map. This value is |
1132 | needed for TLS support. */ | |
1133 | CORE_ADDR | |
1134 | frv_fetch_objfile_link_map (struct objfile *objfile) | |
1135 | { | |
1136 | struct so_list *so; | |
1137 | ||
1138 | /* Cause frv_current_sos() to be run if it hasn't been already. */ | |
1139 | if (main_lm_addr == 0) | |
1140 | solib_add (0, 0, 0, 1); | |
1141 | ||
1142 | /* frv_current_sos() will set main_lm_addr for the main executable. */ | |
1143 | if (objfile == symfile_objfile) | |
1144 | return main_lm_addr; | |
1145 | ||
1146 | /* The other link map addresses may be found by examining the list | |
1147 | of shared libraries. */ | |
1148 | for (so = master_so_list (); so; so = so->next) | |
1149 | { | |
1150 | if (so->objfile == objfile) | |
1151 | return so->lm_info->lm_addr; | |
1152 | } | |
1153 | ||
1154 | /* Not found! */ | |
1155 | return 0; | |
1156 | } | |
1157 | ||
917630e4 | 1158 | struct target_so_ops frv_so_ops; |
c4d10515 | 1159 | |
63807e1d PA |
1160 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1161 | extern initialize_file_ftype _initialize_frv_solib; | |
1162 | ||
c4d10515 KB |
1163 | void |
1164 | _initialize_frv_solib (void) | |
1165 | { | |
1166 | frv_so_ops.relocate_section_addresses = frv_relocate_section_addresses; | |
1167 | frv_so_ops.free_so = frv_free_so; | |
1168 | frv_so_ops.clear_solib = frv_clear_solib; | |
1169 | frv_so_ops.solib_create_inferior_hook = frv_solib_create_inferior_hook; | |
c4d10515 KB |
1170 | frv_so_ops.current_sos = frv_current_sos; |
1171 | frv_so_ops.open_symbol_file_object = open_symbol_file_object; | |
1172 | frv_so_ops.in_dynsym_resolve_code = frv_in_dynsym_resolve_code; | |
831a0c44 | 1173 | frv_so_ops.bfd_open = solib_bfd_open; |
c4d10515 | 1174 | |
c4d10515 | 1175 | /* Debug this file's internals. */ |
ccce17b0 YQ |
1176 | add_setshow_zuinteger_cmd ("solib-frv", class_maintenance, |
1177 | &solib_frv_debug, _("\ | |
85c07804 AC |
1178 | Set internal debugging of shared library code for FR-V."), _("\ |
1179 | Show internal debugging of shared library code for FR-V."), _("\ | |
1180 | When non-zero, FR-V solib specific internal debugging is enabled."), | |
ccce17b0 YQ |
1181 | NULL, |
1182 | NULL, /* FIXME: i18n: */ | |
1183 | &setdebuglist, &showdebuglist); | |
c4d10515 | 1184 | } |