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c4d10515 | 1 | /* Handle FR-V (FDPIC) shared libraries for GDB, the GNU Debugger. |
1d506c26 | 2 | Copyright (C) 2004-2024 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 | ||
ec452525 | 20 | #include "extract-store-integer.h" |
c4d10515 | 21 | #include "gdbcore.h" |
cb5c8c39 | 22 | #include "solib.h" |
c4d10515 KB |
23 | #include "solist.h" |
24 | #include "frv-tdep.h" | |
25 | #include "objfiles.h" | |
26 | #include "symtab.h" | |
c4d10515 | 27 | #include "elf/frv.h" |
cbb099e8 | 28 | #include "gdb_bfd.h" |
99d9c3b9 | 29 | #include "inferior.h" |
c4d10515 | 30 | |
c4d10515 KB |
31 | /* FR-V pointers are four bytes wide. */ |
32 | enum { FRV_PTR_SIZE = 4 }; | |
33 | ||
34 | /* Representation of loadmap and related structs for the FR-V FDPIC ABI. */ | |
35 | ||
36 | /* External versions; the size and alignment of the fields should be | |
37 | the same as those on the target. When loaded, the placement of | |
38 | the bits in each field will be the same as on the target. */ | |
e2b7c966 KB |
39 | typedef gdb_byte ext_Elf32_Half[2]; |
40 | typedef gdb_byte ext_Elf32_Addr[4]; | |
41 | typedef gdb_byte ext_Elf32_Word[4]; | |
c4d10515 KB |
42 | |
43 | struct ext_elf32_fdpic_loadseg | |
44 | { | |
45 | /* Core address to which the segment is mapped. */ | |
46 | ext_Elf32_Addr addr; | |
47 | /* VMA recorded in the program header. */ | |
48 | ext_Elf32_Addr p_vaddr; | |
49 | /* Size of this segment in memory. */ | |
50 | ext_Elf32_Word p_memsz; | |
51 | }; | |
52 | ||
53 | struct ext_elf32_fdpic_loadmap { | |
54 | /* Protocol version number, must be zero. */ | |
55 | ext_Elf32_Half version; | |
56 | /* Number of segments in this map. */ | |
57 | ext_Elf32_Half nsegs; | |
58 | /* The actual memory map. */ | |
59 | struct ext_elf32_fdpic_loadseg segs[1 /* nsegs, actually */]; | |
60 | }; | |
61 | ||
62 | /* Internal versions; the types are GDB types and the data in each | |
63 | of the fields is (or will be) decoded from the external struct | |
64 | for ease of consumption. */ | |
65 | struct int_elf32_fdpic_loadseg | |
66 | { | |
67 | /* Core address to which the segment is mapped. */ | |
68 | CORE_ADDR addr; | |
69 | /* VMA recorded in the program header. */ | |
70 | CORE_ADDR p_vaddr; | |
71 | /* Size of this segment in memory. */ | |
72 | long p_memsz; | |
73 | }; | |
74 | ||
75 | struct int_elf32_fdpic_loadmap { | |
76 | /* Protocol version number, must be zero. */ | |
77 | int version; | |
78 | /* Number of segments in this map. */ | |
79 | int nsegs; | |
80 | /* The actual memory map. */ | |
81 | struct int_elf32_fdpic_loadseg segs[1 /* nsegs, actually */]; | |
82 | }; | |
83 | ||
84 | /* Given address LDMADDR, fetch and decode the loadmap at that address. | |
85 | Return NULL if there is a problem reading the target memory or if | |
86 | there doesn't appear to be a loadmap at the given address. The | |
87 | allocated space (representing the loadmap) returned by this | |
88 | function may be freed via a single call to xfree(). */ | |
89 | ||
90 | static struct int_elf32_fdpic_loadmap * | |
91 | fetch_loadmap (CORE_ADDR ldmaddr) | |
92 | { | |
99d9c3b9 | 93 | bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ()); |
c4d10515 KB |
94 | struct ext_elf32_fdpic_loadmap ext_ldmbuf_partial; |
95 | struct ext_elf32_fdpic_loadmap *ext_ldmbuf; | |
96 | struct int_elf32_fdpic_loadmap *int_ldmbuf; | |
97 | int ext_ldmbuf_size, int_ldmbuf_size; | |
98 | int version, seg, nsegs; | |
99 | ||
100 | /* Fetch initial portion of the loadmap. */ | |
e2b7c966 | 101 | if (target_read_memory (ldmaddr, (gdb_byte *) &ext_ldmbuf_partial, |
dda83cd7 | 102 | sizeof ext_ldmbuf_partial)) |
c4d10515 KB |
103 | { |
104 | /* Problem reading the target's memory. */ | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | /* Extract the version. */ | |
e2b7c966 | 109 | version = extract_unsigned_integer (ext_ldmbuf_partial.version, |
dda83cd7 | 110 | sizeof ext_ldmbuf_partial.version, |
e17a4113 | 111 | byte_order); |
c4d10515 KB |
112 | if (version != 0) |
113 | { | |
114 | /* We only handle version 0. */ | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | /* Extract the number of segments. */ | |
e2b7c966 | 119 | nsegs = extract_unsigned_integer (ext_ldmbuf_partial.nsegs, |
dda83cd7 | 120 | sizeof ext_ldmbuf_partial.nsegs, |
e17a4113 | 121 | byte_order); |
c4d10515 | 122 | |
9bc7b6c6 KB |
123 | if (nsegs <= 0) |
124 | return NULL; | |
125 | ||
c4d10515 KB |
126 | /* Allocate space for the complete (external) loadmap. */ |
127 | ext_ldmbuf_size = sizeof (struct ext_elf32_fdpic_loadmap) | |
dda83cd7 | 128 | + (nsegs - 1) * sizeof (struct ext_elf32_fdpic_loadseg); |
224c3ddb | 129 | ext_ldmbuf = (struct ext_elf32_fdpic_loadmap *) xmalloc (ext_ldmbuf_size); |
c4d10515 KB |
130 | |
131 | /* Copy over the portion of the loadmap that's already been read. */ | |
132 | memcpy (ext_ldmbuf, &ext_ldmbuf_partial, sizeof ext_ldmbuf_partial); | |
133 | ||
134 | /* Read the rest of the loadmap from the target. */ | |
135 | if (target_read_memory (ldmaddr + sizeof ext_ldmbuf_partial, | |
dda83cd7 SM |
136 | (gdb_byte *) ext_ldmbuf + sizeof ext_ldmbuf_partial, |
137 | ext_ldmbuf_size - sizeof ext_ldmbuf_partial)) | |
c4d10515 KB |
138 | { |
139 | /* Couldn't read rest of the loadmap. */ | |
140 | xfree (ext_ldmbuf); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | /* Allocate space into which to put information extract from the | |
145 | external loadsegs. I.e, allocate the internal loadsegs. */ | |
146 | int_ldmbuf_size = sizeof (struct int_elf32_fdpic_loadmap) | |
dda83cd7 | 147 | + (nsegs - 1) * sizeof (struct int_elf32_fdpic_loadseg); |
224c3ddb | 148 | int_ldmbuf = (struct int_elf32_fdpic_loadmap *) xmalloc (int_ldmbuf_size); |
c4d10515 KB |
149 | |
150 | /* Place extracted information in internal structs. */ | |
151 | int_ldmbuf->version = version; | |
152 | int_ldmbuf->nsegs = nsegs; | |
153 | for (seg = 0; seg < nsegs; seg++) | |
154 | { | |
155 | int_ldmbuf->segs[seg].addr | |
e2b7c966 | 156 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].addr, |
dda83cd7 | 157 | sizeof (ext_ldmbuf->segs[seg].addr), |
e17a4113 | 158 | byte_order); |
c4d10515 | 159 | int_ldmbuf->segs[seg].p_vaddr |
e2b7c966 | 160 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_vaddr, |
dda83cd7 | 161 | sizeof (ext_ldmbuf->segs[seg].p_vaddr), |
e17a4113 | 162 | byte_order); |
c4d10515 | 163 | int_ldmbuf->segs[seg].p_memsz |
e2b7c966 | 164 | = extract_unsigned_integer (ext_ldmbuf->segs[seg].p_memsz, |
dda83cd7 | 165 | sizeof (ext_ldmbuf->segs[seg].p_memsz), |
e17a4113 | 166 | byte_order); |
c4d10515 KB |
167 | } |
168 | ||
d5c560f7 | 169 | xfree (ext_ldmbuf); |
c4d10515 KB |
170 | return int_ldmbuf; |
171 | } | |
172 | ||
173 | /* External link_map and elf32_fdpic_loadaddr struct definitions. */ | |
174 | ||
e2b7c966 | 175 | typedef gdb_byte ext_ptr[4]; |
c4d10515 KB |
176 | |
177 | struct ext_elf32_fdpic_loadaddr | |
178 | { | |
179 | ext_ptr map; /* struct elf32_fdpic_loadmap *map; */ | |
180 | ext_ptr got_value; /* void *got_value; */ | |
181 | }; | |
182 | ||
183 | struct ext_link_map | |
184 | { | |
185 | struct ext_elf32_fdpic_loadaddr l_addr; | |
186 | ||
187 | /* Absolute file name object was found in. */ | |
188 | ext_ptr l_name; /* char *l_name; */ | |
189 | ||
190 | /* Dynamic section of the shared object. */ | |
191 | ext_ptr l_ld; /* ElfW(Dyn) *l_ld; */ | |
192 | ||
193 | /* Chain of loaded objects. */ | |
194 | ext_ptr l_next, l_prev; /* struct link_map *l_next, *l_prev; */ | |
195 | }; | |
196 | ||
c378eb4e | 197 | /* Link map info to include in an allocated so_list entry. */ |
c4d10515 | 198 | |
e3b63a79 | 199 | struct lm_info_frv final : public lm_info |
af43057b | 200 | { |
4023ae76 SM |
201 | ~lm_info_frv () |
202 | { | |
203 | xfree (this->map); | |
204 | xfree (this->dyn_syms); | |
205 | xfree (this->dyn_relocs); | |
206 | } | |
af43057b SM |
207 | |
208 | /* The loadmap, digested into an easier to use form. */ | |
4023ae76 | 209 | int_elf32_fdpic_loadmap *map = NULL; |
af43057b | 210 | /* The GOT address for this link map entry. */ |
4023ae76 | 211 | CORE_ADDR got_value = 0; |
af43057b | 212 | /* The link map address, needed for frv_fetch_objfile_link_map(). */ |
4023ae76 | 213 | CORE_ADDR lm_addr = 0; |
af43057b SM |
214 | |
215 | /* Cached dynamic symbol table and dynamic relocs initialized and | |
216 | used only by find_canonical_descriptor_in_load_object(). | |
217 | ||
218 | Note: kevinb/2004-02-26: It appears that calls to | |
219 | bfd_canonicalize_dynamic_reloc() will use the same symbols as | |
220 | those supplied to the first call to this function. Therefore, | |
221 | it's important to NOT free the asymbol ** data structure | |
222 | supplied to the first call. Thus the caching of the dynamic | |
223 | symbols (dyn_syms) is critical for correct operation. The | |
224 | caching of the dynamic relocations could be dispensed with. */ | |
4023ae76 SM |
225 | asymbol **dyn_syms = NULL; |
226 | arelent **dyn_relocs = NULL; | |
227 | int dyn_reloc_count = 0; /* Number of dynamic relocs. */ | |
af43057b | 228 | }; |
c4d10515 KB |
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(). */ | |
d0e449a1 | 234 | static lm_info_frv *main_executable_lm_info; |
c4d10515 KB |
235 | |
236 | static void frv_relocate_main_executable (void); | |
237 | static CORE_ADDR main_got (void); | |
238 | static int enable_break2 (void); | |
239 | ||
6cedf3bc | 240 | /* Implement the "open_symbol_file_object" solib_ops method. */ |
c4d10515 KB |
241 | |
242 | static int | |
bf469271 | 243 | open_symbol_file_object (int from_tty) |
c4d10515 KB |
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 | { | |
99d9c3b9 | 266 | bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ()); |
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, | |
dda83cd7 | 284 | current_program_space->symfile_object_file); |
3b7344d5 | 285 | if (got_sym.minsym == 0) |
c4d10515 | 286 | { |
e26d0dab | 287 | solib_debug_printf ("_GLOBAL_OFFSET_TABLE_ not found."); |
c4d10515 KB |
288 | return 0; |
289 | } | |
290 | ||
4aeddc50 | 291 | addr = got_sym.value_address () + 8; |
c4d10515 | 292 | |
e26d0dab SM |
293 | solib_debug_printf ("_GLOBAL_OFFSET_TABLE_ + 8 = %s", |
294 | hex_string_custom (addr, 8)); | |
c4d10515 KB |
295 | |
296 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
297 | return 0; | |
e17a4113 | 298 | lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 | 299 | |
e26d0dab SM |
300 | solib_debug_printf ("lm_base_cache = %s", |
301 | hex_string_custom (lm_base_cache, 8)); | |
c4d10515 KB |
302 | |
303 | return lm_base_cache; | |
304 | } | |
305 | ||
306 | ||
6cedf3bc | 307 | /* Implement the "current_sos" solib_ops method. */ |
c4d10515 | 308 | |
7b323785 | 309 | static intrusive_list<solib> |
8971d278 | 310 | frv_current_sos () |
c4d10515 | 311 | { |
99d9c3b9 | 312 | bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ()); |
c4d10515 | 313 | CORE_ADDR lm_addr, mgot; |
7b323785 | 314 | intrusive_list<solib> sos; |
c4d10515 | 315 | |
7c699b81 KB |
316 | /* Make sure that the main executable has been relocated. This is |
317 | required in order to find the address of the global offset table, | |
318 | which in turn is used to find the link map info. (See lm_base() | |
319 | for details.) | |
320 | ||
321 | Note that the relocation of the main executable is also performed | |
4d1eb6b4 | 322 | by solib_create_inferior_hook(), however, in the case of core |
7c699b81 | 323 | files, this hook is called too late in order to be of benefit to |
4d1eb6b4 | 324 | solib_add. solib_add eventually calls this this function, |
7c699b81 | 325 | frv_current_sos, and also precedes the call to |
4d1eb6b4 | 326 | solib_create_inferior_hook(). (See post_create_inferior() in |
7c699b81 | 327 | infcmd.c.) */ |
6fdf95ae SM |
328 | if (main_executable_lm_info == 0 |
329 | && current_program_space->core_bfd () != nullptr) | |
7c699b81 KB |
330 | frv_relocate_main_executable (); |
331 | ||
332 | /* Fetch the GOT corresponding to the main executable. */ | |
c4d10515 KB |
333 | mgot = main_got (); |
334 | ||
335 | /* Locate the address of the first link map struct. */ | |
336 | lm_addr = lm_base (); | |
337 | ||
b021a221 | 338 | /* We have at least one link map entry. Fetch the lot of them, |
c4d10515 KB |
339 | building the solist chain. */ |
340 | while (lm_addr) | |
341 | { | |
342 | struct ext_link_map lm_buf; | |
343 | CORE_ADDR got_addr; | |
344 | ||
e26d0dab SM |
345 | solib_debug_printf ("reading link_map entry at %s", |
346 | hex_string_custom (lm_addr, 8)); | |
c4d10515 | 347 | |
3e43a32a MS |
348 | if (target_read_memory (lm_addr, (gdb_byte *) &lm_buf, |
349 | sizeof (lm_buf)) != 0) | |
c4d10515 | 350 | { |
3e43a32a MS |
351 | warning (_("frv_current_sos: Unable to read link map entry. " |
352 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
353 | break; |
354 | } | |
355 | ||
356 | got_addr | |
e2b7c966 | 357 | = extract_unsigned_integer (lm_buf.l_addr.got_value, |
e17a4113 UW |
358 | sizeof (lm_buf.l_addr.got_value), |
359 | byte_order); | |
c4d10515 KB |
360 | /* If the got_addr is the same as mgotr, then we're looking at the |
361 | entry for the main executable. By convention, we don't include | |
362 | this in the list of shared objects. */ | |
363 | if (got_addr != mgot) | |
364 | { | |
c4d10515 | 365 | struct int_elf32_fdpic_loadmap *loadmap; |
c4d10515 KB |
366 | CORE_ADDR addr; |
367 | ||
368 | /* Fetch the load map address. */ | |
e2b7c966 | 369 | addr = extract_unsigned_integer (lm_buf.l_addr.map, |
e17a4113 UW |
370 | sizeof lm_buf.l_addr.map, |
371 | byte_order); | |
c4d10515 KB |
372 | loadmap = fetch_loadmap (addr); |
373 | if (loadmap == NULL) | |
374 | { | |
3e43a32a MS |
375 | warning (_("frv_current_sos: Unable to fetch load map. " |
376 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
377 | break; |
378 | } | |
379 | ||
7b323785 | 380 | solib *sop = new solib; |
6b62451a | 381 | auto li = std::make_unique<lm_info_frv> (); |
d0e449a1 SM |
382 | li->map = loadmap; |
383 | li->got_value = got_addr; | |
384 | li->lm_addr = lm_addr; | |
c4d10515 | 385 | /* Fetch the name. */ |
e2b7c966 | 386 | addr = extract_unsigned_integer (lm_buf.l_name, |
e17a4113 UW |
387 | sizeof (lm_buf.l_name), |
388 | byte_order); | |
66920317 TT |
389 | gdb::unique_xmalloc_ptr<char> name_buf |
390 | = target_read_string (addr, SO_NAME_MAX_PATH_SIZE - 1); | |
c4d10515 | 391 | |
e26d0dab SM |
392 | solib_debug_printf ("name = %s", name_buf.get ()); |
393 | ||
66920317 TT |
394 | if (name_buf == nullptr) |
395 | warning (_("Can't read pathname for link map entry.")); | |
c4d10515 KB |
396 | else |
397 | { | |
98107b0b SM |
398 | sop->so_name = name_buf.get (); |
399 | sop->so_original_name = sop->so_name; | |
c4d10515 KB |
400 | } |
401 | ||
8971d278 | 402 | sos.push_back (*sop); |
c4d10515 | 403 | } |
186993b4 KB |
404 | else |
405 | { | |
406 | main_lm_addr = lm_addr; | |
407 | } | |
c4d10515 | 408 | |
e17a4113 UW |
409 | lm_addr = extract_unsigned_integer (lm_buf.l_next, |
410 | sizeof (lm_buf.l_next), byte_order); | |
c4d10515 KB |
411 | } |
412 | ||
413 | enable_break2 (); | |
414 | ||
8971d278 | 415 | return sos; |
c4d10515 KB |
416 | } |
417 | ||
418 | ||
419 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
420 | run time loader. */ | |
421 | ||
422 | static CORE_ADDR interp_text_sect_low; | |
423 | static CORE_ADDR interp_text_sect_high; | |
424 | static CORE_ADDR interp_plt_sect_low; | |
425 | static CORE_ADDR interp_plt_sect_high; | |
426 | ||
427 | static int | |
428 | frv_in_dynsym_resolve_code (CORE_ADDR pc) | |
429 | { | |
430 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
431 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
3e5d3a5a | 432 | || in_plt_section (pc)); |
c4d10515 KB |
433 | } |
434 | ||
435 | /* Given a loadmap and an address, return the displacement needed | |
436 | to relocate the address. */ | |
437 | ||
63807e1d | 438 | static CORE_ADDR |
c4d10515 | 439 | displacement_from_map (struct int_elf32_fdpic_loadmap *map, |
dda83cd7 | 440 | CORE_ADDR addr) |
c4d10515 KB |
441 | { |
442 | int seg; | |
443 | ||
444 | for (seg = 0; seg < map->nsegs; seg++) | |
445 | { | |
446 | if (map->segs[seg].p_vaddr <= addr | |
dda83cd7 | 447 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) |
c4d10515 KB |
448 | { |
449 | return map->segs[seg].addr - map->segs[seg].p_vaddr; | |
450 | } | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | /* Print a warning about being unable to set the dynamic linker | |
457 | breakpoint. */ | |
458 | ||
459 | static void | |
460 | enable_break_failure_warning (void) | |
461 | { | |
8a3fe4f8 | 462 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
dda83cd7 | 463 | "GDB will be unable to debug shared library initializers\n" |
8a3fe4f8 | 464 | "and track explicitly loaded dynamic code.")); |
c4d10515 KB |
465 | } |
466 | ||
7f86f058 | 467 | /* Arrange for dynamic linker to hit breakpoint. |
c4d10515 KB |
468 | |
469 | The dynamic linkers has, as part of its debugger interface, support | |
470 | for arranging for the inferior to hit a breakpoint after mapping in | |
471 | the shared libraries. This function enables that breakpoint. | |
472 | ||
473 | On the FR-V, using the shared library (FDPIC) ABI, the symbol | |
474 | _dl_debug_addr points to the r_debug struct which contains | |
475 | a field called r_brk. r_brk is the address of the function | |
476 | descriptor upon which a breakpoint must be placed. Being a | |
477 | function descriptor, we must extract the entry point in order | |
478 | to set the breakpoint. | |
479 | ||
480 | Our strategy will be to get the .interp section from the | |
481 | executable. This section will provide us with the name of the | |
482 | interpreter. We'll open the interpreter and then look up | |
483 | the address of _dl_debug_addr. We then relocate this address | |
484 | using the interpreter's loadmap. Once the relocated address | |
485 | is known, we fetch the value (address) corresponding to r_brk | |
486 | and then use that value to fetch the entry point of the function | |
7f86f058 | 487 | we're interested in. */ |
c4d10515 | 488 | |
c4d10515 KB |
489 | static int enable_break2_done = 0; |
490 | ||
491 | static int | |
492 | enable_break2 (void) | |
493 | { | |
99d9c3b9 | 494 | bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ()); |
c4d10515 KB |
495 | asection *interp_sect; |
496 | ||
cb7db0f2 | 497 | if (enable_break2_done) |
c4d10515 KB |
498 | return 1; |
499 | ||
c4d10515 KB |
500 | interp_text_sect_low = interp_text_sect_high = 0; |
501 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
502 | ||
503 | /* Find the .interp section; if not found, warn the user and drop | |
504 | into the old breakpoint at symbol code. */ | |
7e10abd1 TT |
505 | interp_sect = bfd_get_section_by_name (current_program_space->exec_bfd (), |
506 | ".interp"); | |
c4d10515 KB |
507 | if (interp_sect) |
508 | { | |
509 | unsigned int interp_sect_size; | |
001f13d8 | 510 | char *buf; |
c4d10515 KB |
511 | int status; |
512 | CORE_ADDR addr, interp_loadmap_addr; | |
e2b7c966 | 513 | gdb_byte addr_buf[FRV_PTR_SIZE]; |
c4d10515 KB |
514 | struct int_elf32_fdpic_loadmap *ldm; |
515 | ||
516 | /* Read the contents of the .interp section into a local buffer; | |
dda83cd7 | 517 | the contents specify the dynamic linker this program uses. */ |
fd361982 | 518 | interp_sect_size = bfd_section_size (interp_sect); |
224c3ddb | 519 | buf = (char *) alloca (interp_sect_size); |
7e10abd1 TT |
520 | bfd_get_section_contents (current_program_space->exec_bfd (), |
521 | interp_sect, buf, 0, interp_sect_size); | |
c4d10515 KB |
522 | |
523 | /* Now we need to figure out where the dynamic linker was | |
dda83cd7 SM |
524 | loaded so that we can load its symbols and place a breakpoint |
525 | in the dynamic linker itself. | |
c4d10515 | 526 | |
dda83cd7 SM |
527 | This address is stored on the stack. However, I've been unable |
528 | to find any magic formula to find it for Solaris (appears to | |
529 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
530 | mechanism to find the dynamic linker's base address. */ | |
c4d10515 | 531 | |
192b62ce | 532 | gdb_bfd_ref_ptr tmp_bfd; |
a70b8144 | 533 | try |
dda83cd7 SM |
534 | { |
535 | tmp_bfd = solib_bfd_open (buf); | |
536 | } | |
230d2906 | 537 | catch (const gdb_exception &ex) |
492d29ea PA |
538 | { |
539 | } | |
492d29ea | 540 | |
c4d10515 KB |
541 | if (tmp_bfd == NULL) |
542 | { | |
543 | enable_break_failure_warning (); | |
544 | return 0; | |
545 | } | |
546 | ||
99d9c3b9 | 547 | status = frv_fdpic_loadmap_addresses (current_inferior ()->arch (), |
dda83cd7 | 548 | &interp_loadmap_addr, 0); |
c4d10515 KB |
549 | if (status < 0) |
550 | { | |
8a3fe4f8 | 551 | warning (_("Unable to determine dynamic linker loadmap address.")); |
c4d10515 | 552 | enable_break_failure_warning (); |
c4d10515 KB |
553 | return 0; |
554 | } | |
555 | ||
e26d0dab SM |
556 | solib_debug_printf ("interp_loadmap_addr = %s", |
557 | hex_string_custom (interp_loadmap_addr, 8)); | |
c4d10515 KB |
558 | |
559 | ldm = fetch_loadmap (interp_loadmap_addr); | |
560 | if (ldm == NULL) | |
561 | { | |
8a3fe4f8 | 562 | warning (_("Unable to load dynamic linker loadmap at address %s."), |
dda83cd7 | 563 | hex_string_custom (interp_loadmap_addr, 8)); |
c4d10515 | 564 | enable_break_failure_warning (); |
c4d10515 KB |
565 | return 0; |
566 | } | |
567 | ||
568 | /* Record the relocated start and end address of the dynamic linker | |
dda83cd7 | 569 | text and plt section for svr4_in_dynsym_resolve_code. */ |
192b62ce | 570 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".text"); |
c4d10515 KB |
571 | if (interp_sect) |
572 | { | |
fd361982 | 573 | interp_text_sect_low = bfd_section_vma (interp_sect); |
c4d10515 KB |
574 | interp_text_sect_low |
575 | += displacement_from_map (ldm, interp_text_sect_low); | |
576 | interp_text_sect_high | |
fd361982 | 577 | = interp_text_sect_low + bfd_section_size (interp_sect); |
c4d10515 | 578 | } |
192b62ce | 579 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".plt"); |
c4d10515 KB |
580 | if (interp_sect) |
581 | { | |
fd361982 | 582 | interp_plt_sect_low = bfd_section_vma (interp_sect); |
c4d10515 KB |
583 | interp_plt_sect_low |
584 | += displacement_from_map (ldm, interp_plt_sect_low); | |
585 | interp_plt_sect_high = | |
fd361982 | 586 | interp_plt_sect_low + bfd_section_size (interp_sect); |
c4d10515 KB |
587 | } |
588 | ||
6b3a2759 TT |
589 | addr = (gdb_bfd_lookup_symbol |
590 | (tmp_bfd.get (), | |
591 | [] (const asymbol *sym) | |
592 | { | |
593 | return strcmp (sym->name, "_dl_debug_addr") == 0; | |
594 | })); | |
cb457ae2 | 595 | |
c4d10515 KB |
596 | if (addr == 0) |
597 | { | |
3e43a32a MS |
598 | warning (_("Could not find symbol _dl_debug_addr " |
599 | "in dynamic linker")); | |
c4d10515 | 600 | enable_break_failure_warning (); |
c4d10515 KB |
601 | return 0; |
602 | } | |
603 | ||
e26d0dab SM |
604 | solib_debug_printf ("_dl_debug_addr (prior to relocation) = %s", |
605 | hex_string_custom (addr, 8)); | |
c4d10515 KB |
606 | |
607 | addr += displacement_from_map (ldm, addr); | |
608 | ||
e26d0dab SM |
609 | solib_debug_printf ("_dl_debug_addr (after relocation) = %s", |
610 | hex_string_custom (addr, 8)); | |
c4d10515 KB |
611 | |
612 | /* Fetch the address of the r_debug struct. */ | |
613 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
614 | { | |
3e43a32a MS |
615 | warning (_("Unable to fetch contents of _dl_debug_addr " |
616 | "(at address %s) from dynamic linker"), | |
dda83cd7 | 617 | hex_string_custom (addr, 8)); |
c4d10515 | 618 | } |
e17a4113 | 619 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 | 620 | |
e26d0dab SM |
621 | solib_debug_printf ("_dl_debug_addr[0..3] = %s", |
622 | hex_string_custom (addr, 8)); | |
cb7db0f2 MF |
623 | |
624 | /* If it's zero, then the ldso hasn't initialized yet, and so | |
dda83cd7 | 625 | there are no shared libs yet loaded. */ |
cb7db0f2 MF |
626 | if (addr == 0) |
627 | { | |
e26d0dab | 628 | solib_debug_printf ("ldso not yet initialized"); |
cb7db0f2 MF |
629 | /* Do not warn, but mark to run again. */ |
630 | return 0; | |
631 | } | |
632 | ||
c4d10515 | 633 | /* Fetch the r_brk field. It's 8 bytes from the start of |
dda83cd7 | 634 | _dl_debug_addr. */ |
c4d10515 KB |
635 | if (target_read_memory (addr + 8, addr_buf, sizeof addr_buf) != 0) |
636 | { | |
3e43a32a MS |
637 | warning (_("Unable to fetch _dl_debug_addr->r_brk " |
638 | "(at address %s) from dynamic linker"), | |
dda83cd7 | 639 | hex_string_custom (addr + 8, 8)); |
c4d10515 | 640 | enable_break_failure_warning (); |
c4d10515 KB |
641 | return 0; |
642 | } | |
e17a4113 | 643 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 KB |
644 | |
645 | /* Now fetch the function entry point. */ | |
646 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
647 | { | |
3e43a32a MS |
648 | warning (_("Unable to fetch _dl_debug_addr->.r_brk entry point " |
649 | "(at address %s) from dynamic linker"), | |
dda83cd7 | 650 | hex_string_custom (addr, 8)); |
c4d10515 | 651 | enable_break_failure_warning (); |
c4d10515 KB |
652 | return 0; |
653 | } | |
e17a4113 | 654 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 | 655 | |
192b62ce | 656 | /* We're done with the loadmap. */ |
c4d10515 KB |
657 | xfree (ldm); |
658 | ||
cb7db0f2 | 659 | /* Remove all the solib event breakpoints. Their addresses |
dda83cd7 | 660 | may have changed since the last time we ran the program. */ |
cb7db0f2 MF |
661 | remove_solib_event_breakpoints (); |
662 | ||
c4d10515 | 663 | /* Now (finally!) create the solib breakpoint. */ |
99d9c3b9 | 664 | create_solib_event_breakpoint (current_inferior ()->arch (), addr); |
c4d10515 | 665 | |
cb7db0f2 MF |
666 | enable_break2_done = 1; |
667 | ||
c4d10515 KB |
668 | return 1; |
669 | } | |
670 | ||
671 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ | |
672 | enable_break_failure_warning (); | |
673 | ||
674 | /* Failure return. */ | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static int | |
679 | enable_break (void) | |
680 | { | |
681 | asection *interp_sect; | |
d56e56aa | 682 | CORE_ADDR entry_point; |
c4d10515 | 683 | |
a42d7dd8 | 684 | if (current_program_space->symfile_object_file == NULL) |
c4d10515 | 685 | { |
e26d0dab | 686 | solib_debug_printf ("No symbol file found."); |
abd0a5fa JK |
687 | return 0; |
688 | } | |
c4d10515 | 689 | |
d56e56aa | 690 | if (!entry_point_address_query (&entry_point)) |
abd0a5fa | 691 | { |
e26d0dab | 692 | solib_debug_printf ("Symbol file has no entry point."); |
abd0a5fa | 693 | return 0; |
c4d10515 | 694 | } |
abd0a5fa JK |
695 | |
696 | /* Check for the presence of a .interp section. If there is no | |
697 | such section, the executable is statically linked. */ | |
698 | ||
7e10abd1 TT |
699 | interp_sect = bfd_get_section_by_name (current_program_space->exec_bfd (), |
700 | ".interp"); | |
abd0a5fa JK |
701 | |
702 | if (interp_sect == NULL) | |
c4d10515 | 703 | { |
e26d0dab | 704 | solib_debug_printf ("No .interp section found."); |
abd0a5fa | 705 | return 0; |
c4d10515 KB |
706 | } |
707 | ||
99d9c3b9 | 708 | create_solib_event_breakpoint (current_inferior ()->arch (), entry_point); |
abd0a5fa | 709 | |
e26d0dab SM |
710 | solib_debug_printf ("solib event breakpoint placed at entry point: %s", |
711 | hex_string_custom (entry_point, 8)); | |
c4d10515 KB |
712 | return 1; |
713 | } | |
714 | ||
c4d10515 KB |
715 | static void |
716 | frv_relocate_main_executable (void) | |
717 | { | |
718 | int status; | |
9bc7b6c6 | 719 | CORE_ADDR exec_addr, interp_addr; |
c4d10515 | 720 | struct int_elf32_fdpic_loadmap *ldm; |
c4d10515 | 721 | int changed; |
c4d10515 | 722 | |
99d9c3b9 | 723 | status = frv_fdpic_loadmap_addresses (current_inferior ()->arch (), |
dda83cd7 | 724 | &interp_addr, &exec_addr); |
c4d10515 | 725 | |
9bc7b6c6 | 726 | if (status < 0 || (exec_addr == 0 && interp_addr == 0)) |
c4d10515 KB |
727 | { |
728 | /* Not using FDPIC ABI, so do nothing. */ | |
729 | return; | |
730 | } | |
731 | ||
732 | /* Fetch the loadmap located at ``exec_addr''. */ | |
733 | ldm = fetch_loadmap (exec_addr); | |
734 | if (ldm == NULL) | |
8a3fe4f8 | 735 | error (_("Unable to load the executable's loadmap.")); |
c4d10515 | 736 | |
4023ae76 SM |
737 | delete main_executable_lm_info; |
738 | main_executable_lm_info = new lm_info_frv; | |
c4d10515 KB |
739 | main_executable_lm_info->map = ldm; |
740 | ||
a42d7dd8 TT |
741 | objfile *objf = current_program_space->symfile_object_file; |
742 | section_offsets new_offsets (objf->section_offsets.size ()); | |
c4d10515 KB |
743 | changed = 0; |
744 | ||
5250cbc8 | 745 | for (obj_section *osect : objf->sections ()) |
c4d10515 KB |
746 | { |
747 | CORE_ADDR orig_addr, addr, offset; | |
748 | int osect_idx; | |
749 | int seg; | |
750 | ||
9ed8433a | 751 | osect_idx = osect - objf->sections_start; |
c4d10515 KB |
752 | |
753 | /* Current address of section. */ | |
0c1bcd23 | 754 | addr = osect->addr (); |
c4d10515 | 755 | /* Offset from where this section started. */ |
a42d7dd8 | 756 | offset = objf->section_offsets[osect_idx]; |
c4d10515 KB |
757 | /* Original address prior to any past relocations. */ |
758 | orig_addr = addr - offset; | |
759 | ||
760 | for (seg = 0; seg < ldm->nsegs; seg++) | |
761 | { | |
762 | if (ldm->segs[seg].p_vaddr <= orig_addr | |
763 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) | |
764 | { | |
6a053cb1 | 765 | new_offsets[osect_idx] |
c4d10515 KB |
766 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; |
767 | ||
6a053cb1 | 768 | if (new_offsets[osect_idx] != offset) |
c4d10515 KB |
769 | changed = 1; |
770 | break; | |
771 | } | |
772 | } | |
773 | } | |
774 | ||
775 | if (changed) | |
a42d7dd8 | 776 | objfile_relocate (objf, new_offsets); |
c4d10515 | 777 | |
a42d7dd8 TT |
778 | /* Now that OBJF has been relocated, we can compute the GOT value |
779 | and stash it away. */ | |
c4d10515 KB |
780 | main_executable_lm_info->got_value = main_got (); |
781 | } | |
782 | ||
7f86f058 | 783 | /* Implement the "create_inferior_hook" target_solib_ops method. |
c4d10515 | 784 | |
7f86f058 PA |
785 | For the FR-V shared library ABI (FDPIC), the main executable needs |
786 | to be relocated. The shared library breakpoints also need to be | |
787 | enabled. */ | |
c4d10515 KB |
788 | |
789 | static void | |
268a4a75 | 790 | frv_solib_create_inferior_hook (int from_tty) |
c4d10515 KB |
791 | { |
792 | /* Relocate main executable. */ | |
793 | frv_relocate_main_executable (); | |
794 | ||
795 | /* Enable shared library breakpoints. */ | |
796 | if (!enable_break ()) | |
797 | { | |
8a3fe4f8 | 798 | warning (_("shared library handler failed to enable breakpoint")); |
c4d10515 KB |
799 | return; |
800 | } | |
801 | } | |
802 | ||
803 | static void | |
581b34c2 | 804 | frv_clear_solib (program_space *pspace) |
c4d10515 KB |
805 | { |
806 | lm_base_cache = 0; | |
c4d10515 | 807 | enable_break2_done = 0; |
186993b4 | 808 | main_lm_addr = 0; |
4023ae76 SM |
809 | |
810 | delete main_executable_lm_info; | |
811 | main_executable_lm_info = NULL; | |
c4d10515 KB |
812 | } |
813 | ||
c4d10515 | 814 | static void |
7b323785 | 815 | frv_relocate_section_addresses (solib &so, target_section *sec) |
c4d10515 KB |
816 | { |
817 | int seg; | |
7ad0a42e | 818 | auto *li = gdb::checked_static_cast<lm_info_frv *> (so.lm_info.get ()); |
d0e449a1 | 819 | int_elf32_fdpic_loadmap *map = li->map; |
c4d10515 KB |
820 | |
821 | for (seg = 0; seg < map->nsegs; seg++) | |
822 | { | |
823 | if (map->segs[seg].p_vaddr <= sec->addr | |
dda83cd7 | 824 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) |
c4d10515 KB |
825 | { |
826 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; | |
433759f7 | 827 | |
c4d10515 KB |
828 | sec->addr += displ; |
829 | sec->endaddr += displ; | |
830 | break; | |
831 | } | |
832 | } | |
833 | } | |
834 | ||
835 | /* Return the GOT address associated with the main executable. Return | |
836 | 0 if it can't be found. */ | |
837 | ||
838 | static CORE_ADDR | |
839 | main_got (void) | |
840 | { | |
3b7344d5 | 841 | struct bound_minimal_symbol got_sym; |
c4d10515 | 842 | |
a42d7dd8 TT |
843 | objfile *objf = current_program_space->symfile_object_file; |
844 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, objf); | |
3b7344d5 | 845 | if (got_sym.minsym == 0) |
c4d10515 KB |
846 | return 0; |
847 | ||
4aeddc50 | 848 | return got_sym.value_address (); |
c4d10515 KB |
849 | } |
850 | ||
851 | /* Find the global pointer for the given function address ADDR. */ | |
852 | ||
853 | CORE_ADDR | |
854 | frv_fdpic_find_global_pointer (CORE_ADDR addr) | |
855 | { | |
7b323785 | 856 | for (const solib &so : current_program_space->solibs ()) |
c4d10515 KB |
857 | { |
858 | int seg; | |
8971d278 | 859 | auto *li = gdb::checked_static_cast<lm_info_frv *> (so.lm_info.get ()); |
d0e449a1 | 860 | int_elf32_fdpic_loadmap *map = li->map; |
c4d10515 KB |
861 | |
862 | for (seg = 0; seg < map->nsegs; seg++) | |
863 | { | |
864 | if (map->segs[seg].addr <= addr | |
865 | && addr < map->segs[seg].addr + map->segs[seg].p_memsz) | |
d0e449a1 | 866 | return li->got_value; |
c4d10515 | 867 | } |
c4d10515 KB |
868 | } |
869 | ||
7a9dd1b2 | 870 | /* Didn't find it in any of the shared objects. So assume it's in the |
c4d10515 KB |
871 | main executable. */ |
872 | return main_got (); | |
873 | } | |
874 | ||
875 | /* Forward declarations for frv_fdpic_find_canonical_descriptor(). */ | |
876 | static CORE_ADDR find_canonical_descriptor_in_load_object | |
d0e449a1 | 877 | (CORE_ADDR, CORE_ADDR, const char *, bfd *, lm_info_frv *); |
c4d10515 KB |
878 | |
879 | /* Given a function entry point, attempt to find the canonical descriptor | |
880 | associated with that entry point. Return 0 if no canonical descriptor | |
881 | could be found. */ | |
882 | ||
883 | CORE_ADDR | |
884 | frv_fdpic_find_canonical_descriptor (CORE_ADDR entry_point) | |
885 | { | |
0d5cff50 | 886 | const char *name; |
c4d10515 KB |
887 | CORE_ADDR addr; |
888 | CORE_ADDR got_value; | |
c4d10515 | 889 | struct symbol *sym; |
c4d10515 KB |
890 | |
891 | /* Fetch the corresponding global pointer for the entry point. */ | |
892 | got_value = frv_fdpic_find_global_pointer (entry_point); | |
893 | ||
894 | /* Attempt to find the name of the function. If the name is available, | |
895 | it'll be used as an aid in finding matching functions in the dynamic | |
896 | symbol table. */ | |
897 | sym = find_pc_function (entry_point); | |
898 | if (sym == 0) | |
899 | name = 0; | |
900 | else | |
987012b8 | 901 | name = sym->linkage_name (); |
c4d10515 KB |
902 | |
903 | /* Check the main executable. */ | |
a42d7dd8 | 904 | objfile *objf = current_program_space->symfile_object_file; |
c4d10515 | 905 | addr = find_canonical_descriptor_in_load_object |
98badbfd | 906 | (entry_point, got_value, name, objf->obfd.get (), |
c4d10515 KB |
907 | main_executable_lm_info); |
908 | ||
909 | /* If descriptor not found via main executable, check each load object | |
910 | in list of shared objects. */ | |
911 | if (addr == 0) | |
912 | { | |
7b323785 | 913 | for (const solib &so : current_program_space->solibs ()) |
c4d10515 | 914 | { |
8971d278 | 915 | auto *li = gdb::checked_static_cast<lm_info_frv *> (so.lm_info.get ()); |
d0e449a1 | 916 | |
c4d10515 | 917 | addr = find_canonical_descriptor_in_load_object |
8971d278 | 918 | (entry_point, got_value, name, so.abfd.get(), li); |
c4d10515 KB |
919 | |
920 | if (addr != 0) | |
921 | break; | |
c4d10515 KB |
922 | } |
923 | } | |
924 | ||
925 | return addr; | |
926 | } | |
927 | ||
928 | static CORE_ADDR | |
929 | find_canonical_descriptor_in_load_object | |
0d5cff50 | 930 | (CORE_ADDR entry_point, CORE_ADDR got_value, const char *name, bfd *abfd, |
d0e449a1 | 931 | lm_info_frv *lm) |
c4d10515 | 932 | { |
99d9c3b9 | 933 | bfd_endian byte_order = gdbarch_byte_order (current_inferior ()->arch ()); |
c4d10515 KB |
934 | arelent *rel; |
935 | unsigned int i; | |
936 | CORE_ADDR addr = 0; | |
937 | ||
938 | /* Nothing to do if no bfd. */ | |
939 | if (abfd == 0) | |
940 | return 0; | |
941 | ||
35e08e03 KB |
942 | /* Nothing to do if no link map. */ |
943 | if (lm == 0) | |
944 | return 0; | |
945 | ||
c4d10515 KB |
946 | /* We want to scan the dynamic relocs for R_FRV_FUNCDESC relocations. |
947 | (More about this later.) But in order to fetch the relocs, we | |
948 | need to first fetch the dynamic symbols. These symbols need to | |
949 | be cached due to the way that bfd_canonicalize_dynamic_reloc() | |
950 | works. (See the comments in the declaration of struct lm_info | |
951 | for more information.) */ | |
952 | if (lm->dyn_syms == NULL) | |
953 | { | |
954 | long storage_needed; | |
955 | unsigned int number_of_symbols; | |
956 | ||
957 | /* Determine amount of space needed to hold the dynamic symbol table. */ | |
958 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
959 | ||
960 | /* If there are no dynamic symbols, there's nothing to do. */ | |
961 | if (storage_needed <= 0) | |
962 | return 0; | |
963 | ||
964 | /* Allocate space for the dynamic symbol table. */ | |
965 | lm->dyn_syms = (asymbol **) xmalloc (storage_needed); | |
966 | ||
967 | /* Fetch the dynamic symbol table. */ | |
968 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, lm->dyn_syms); | |
969 | ||
970 | if (number_of_symbols == 0) | |
971 | return 0; | |
972 | } | |
973 | ||
974 | /* Fetch the dynamic relocations if not already cached. */ | |
975 | if (lm->dyn_relocs == NULL) | |
976 | { | |
977 | long storage_needed; | |
978 | ||
979 | /* Determine amount of space needed to hold the dynamic relocs. */ | |
980 | storage_needed = bfd_get_dynamic_reloc_upper_bound (abfd); | |
981 | ||
982 | /* Bail out if there are no dynamic relocs. */ | |
983 | if (storage_needed <= 0) | |
984 | return 0; | |
985 | ||
986 | /* Allocate space for the relocs. */ | |
987 | lm->dyn_relocs = (arelent **) xmalloc (storage_needed); | |
988 | ||
989 | /* Fetch the dynamic relocs. */ | |
990 | lm->dyn_reloc_count | |
991 | = bfd_canonicalize_dynamic_reloc (abfd, lm->dyn_relocs, lm->dyn_syms); | |
992 | } | |
993 | ||
994 | /* Search the dynamic relocs. */ | |
995 | for (i = 0; i < lm->dyn_reloc_count; i++) | |
996 | { | |
997 | rel = lm->dyn_relocs[i]; | |
998 | ||
999 | /* Relocs of interest are those which meet the following | |
dda83cd7 | 1000 | criteria: |
c4d10515 KB |
1001 | |
1002 | - the names match (assuming the caller could provide | |
1003 | a name which matches ``entry_point''). | |
1004 | - the relocation type must be R_FRV_FUNCDESC. Relocs | |
1005 | of this type are used (by the dynamic linker) to | |
1006 | look up the address of a canonical descriptor (allocating | |
1007 | it if need be) and initializing the GOT entry referred | |
1008 | to by the offset to the address of the descriptor. | |
1009 | ||
1010 | These relocs of interest may be used to obtain a | |
1011 | candidate descriptor by first adjusting the reloc's | |
1012 | address according to the link map and then dereferencing | |
1013 | this address (which is a GOT entry) to obtain a descriptor | |
1014 | address. */ | |
1015 | if ((name == 0 || strcmp (name, (*rel->sym_ptr_ptr)->name) == 0) | |
dda83cd7 | 1016 | && rel->howto->type == R_FRV_FUNCDESC) |
c4d10515 | 1017 | { |
e2b7c966 | 1018 | gdb_byte buf [FRV_PTR_SIZE]; |
c4d10515 KB |
1019 | |
1020 | /* Compute address of address of candidate descriptor. */ | |
1021 | addr = rel->address + displacement_from_map (lm->map, rel->address); | |
1022 | ||
1023 | /* Fetch address of candidate descriptor. */ | |
1024 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1025 | continue; | |
e17a4113 | 1026 | addr = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 KB |
1027 | |
1028 | /* Check for matching entry point. */ | |
1029 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1030 | continue; | |
e17a4113 UW |
1031 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1032 | != entry_point) | |
c4d10515 KB |
1033 | continue; |
1034 | ||
1035 | /* Check for matching got value. */ | |
1036 | if (target_read_memory (addr + 4, buf, sizeof buf) != 0) | |
1037 | continue; | |
e17a4113 UW |
1038 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1039 | != got_value) | |
c4d10515 KB |
1040 | continue; |
1041 | ||
1042 | /* Match was successful! Exit loop. */ | |
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | return addr; | |
1048 | } | |
1049 | ||
186993b4 KB |
1050 | /* Given an objfile, return the address of its link map. This value is |
1051 | needed for TLS support. */ | |
1052 | CORE_ADDR | |
1053 | frv_fetch_objfile_link_map (struct objfile *objfile) | |
1054 | { | |
186993b4 KB |
1055 | /* Cause frv_current_sos() to be run if it hasn't been already. */ |
1056 | if (main_lm_addr == 0) | |
e696b3ad | 1057 | solib_add (0, 0, 1); |
186993b4 KB |
1058 | |
1059 | /* frv_current_sos() will set main_lm_addr for the main executable. */ | |
a42d7dd8 | 1060 | if (objfile == current_program_space->symfile_object_file) |
186993b4 KB |
1061 | return main_lm_addr; |
1062 | ||
1063 | /* The other link map addresses may be found by examining the list | |
1064 | of shared libraries. */ | |
7b323785 | 1065 | for (const solib &so : current_program_space->solibs ()) |
186993b4 | 1066 | { |
8971d278 | 1067 | auto *li = gdb::checked_static_cast<lm_info_frv *> (so.lm_info.get ()); |
d0e449a1 | 1068 | |
8971d278 | 1069 | if (so.objfile == objfile) |
d0e449a1 | 1070 | return li->lm_addr; |
186993b4 KB |
1071 | } |
1072 | ||
1073 | /* Not found! */ | |
1074 | return 0; | |
1075 | } | |
1076 | ||
6cedf3bc | 1077 | const solib_ops frv_so_ops = |
549dfc51 TT |
1078 | { |
1079 | frv_relocate_section_addresses, | |
549dfc51 TT |
1080 | nullptr, |
1081 | frv_clear_solib, | |
1082 | frv_solib_create_inferior_hook, | |
1083 | frv_current_sos, | |
1084 | open_symbol_file_object, | |
1085 | frv_in_dynsym_resolve_code, | |
1086 | solib_bfd_open, | |
1087 | }; |