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c4d10515 | 1 | /* Handle FR-V (FDPIC) shared libraries for GDB, the GNU Debugger. |
b811d2c2 | 2 | Copyright (C) 2004-2020 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 ()); |
c4d10515 KB |
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]; |
c4d10515 KB |
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. */ |
c4d10515 | 204 | |
d0e449a1 | 205 | struct lm_info_frv : public lm_info_base |
af43057b | 206 | { |
4023ae76 SM |
207 | ~lm_info_frv () |
208 | { | |
209 | xfree (this->map); | |
210 | xfree (this->dyn_syms); | |
211 | xfree (this->dyn_relocs); | |
212 | } | |
af43057b SM |
213 | |
214 | /* The loadmap, digested into an easier to use form. */ | |
4023ae76 | 215 | int_elf32_fdpic_loadmap *map = NULL; |
af43057b | 216 | /* The GOT address for this link map entry. */ |
4023ae76 | 217 | CORE_ADDR got_value = 0; |
af43057b | 218 | /* The link map address, needed for frv_fetch_objfile_link_map(). */ |
4023ae76 | 219 | CORE_ADDR lm_addr = 0; |
af43057b SM |
220 | |
221 | /* Cached dynamic symbol table and dynamic relocs initialized and | |
222 | used only by find_canonical_descriptor_in_load_object(). | |
223 | ||
224 | Note: kevinb/2004-02-26: It appears that calls to | |
225 | bfd_canonicalize_dynamic_reloc() will use the same symbols as | |
226 | those supplied to the first call to this function. Therefore, | |
227 | it's important to NOT free the asymbol ** data structure | |
228 | supplied to the first call. Thus the caching of the dynamic | |
229 | symbols (dyn_syms) is critical for correct operation. The | |
230 | caching of the dynamic relocations could be dispensed with. */ | |
4023ae76 SM |
231 | asymbol **dyn_syms = NULL; |
232 | arelent **dyn_relocs = NULL; | |
233 | int dyn_reloc_count = 0; /* Number of dynamic relocs. */ | |
af43057b | 234 | }; |
c4d10515 KB |
235 | |
236 | /* The load map, got value, etc. are not available from the chain | |
237 | of loaded shared objects. ``main_executable_lm_info'' provides | |
238 | a way to get at this information so that it doesn't need to be | |
239 | frequently recomputed. Initialized by frv_relocate_main_executable(). */ | |
d0e449a1 | 240 | static lm_info_frv *main_executable_lm_info; |
c4d10515 KB |
241 | |
242 | static void frv_relocate_main_executable (void); | |
243 | static CORE_ADDR main_got (void); | |
244 | static int enable_break2 (void); | |
245 | ||
7f86f058 | 246 | /* Implement the "open_symbol_file_object" target_so_ops method. */ |
c4d10515 KB |
247 | |
248 | static int | |
bf469271 | 249 | open_symbol_file_object (int from_tty) |
c4d10515 KB |
250 | { |
251 | /* Unimplemented. */ | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* Cached value for lm_base(), below. */ | |
256 | static CORE_ADDR lm_base_cache = 0; | |
257 | ||
186993b4 KB |
258 | /* Link map address for main module. */ |
259 | static CORE_ADDR main_lm_addr = 0; | |
260 | ||
c4d10515 KB |
261 | /* Return the address from which the link map chain may be found. On |
262 | the FR-V, this may be found in a number of ways. Assuming that the | |
263 | main executable has already been relocated, the easiest way to find | |
264 | this value is to look up the address of _GLOBAL_OFFSET_TABLE_. A | |
265 | pointer to the start of the link map will be located at the word found | |
266 | at _GLOBAL_OFFSET_TABLE_ + 8. (This is part of the dynamic linker | |
267 | reserve area mandated by the ABI.) */ | |
268 | ||
269 | static CORE_ADDR | |
270 | lm_base (void) | |
271 | { | |
f5656ead | 272 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
3b7344d5 | 273 | struct bound_minimal_symbol got_sym; |
c4d10515 | 274 | CORE_ADDR addr; |
e2b7c966 | 275 | gdb_byte buf[FRV_PTR_SIZE]; |
c4d10515 | 276 | |
89a7ee67 KB |
277 | /* One of our assumptions is that the main executable has been relocated. |
278 | Bail out if this has not happened. (Note that post_create_inferior() | |
279 | in infcmd.c will call solib_add prior to solib_create_inferior_hook(). | |
280 | If we allow this to happen, lm_base_cache will be initialized with | |
281 | a bogus value. */ | |
282 | if (main_executable_lm_info == 0) | |
283 | return 0; | |
284 | ||
c4d10515 KB |
285 | /* If we already have a cached value, return it. */ |
286 | if (lm_base_cache) | |
287 | return lm_base_cache; | |
288 | ||
289 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", NULL, | |
290 | symfile_objfile); | |
3b7344d5 | 291 | if (got_sym.minsym == 0) |
c4d10515 KB |
292 | { |
293 | if (solib_frv_debug) | |
294 | fprintf_unfiltered (gdb_stdlog, | |
295 | "lm_base: _GLOBAL_OFFSET_TABLE_ not found.\n"); | |
296 | return 0; | |
297 | } | |
298 | ||
77e371c0 | 299 | addr = BMSYMBOL_VALUE_ADDRESS (got_sym) + 8; |
c4d10515 KB |
300 | |
301 | if (solib_frv_debug) | |
302 | fprintf_unfiltered (gdb_stdlog, | |
303 | "lm_base: _GLOBAL_OFFSET_TABLE_ + 8 = %s\n", | |
bb599908 | 304 | hex_string_custom (addr, 8)); |
c4d10515 KB |
305 | |
306 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
307 | return 0; | |
e17a4113 | 308 | lm_base_cache = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 KB |
309 | |
310 | if (solib_frv_debug) | |
311 | fprintf_unfiltered (gdb_stdlog, | |
312 | "lm_base: lm_base_cache = %s\n", | |
bb599908 | 313 | hex_string_custom (lm_base_cache, 8)); |
c4d10515 KB |
314 | |
315 | return lm_base_cache; | |
316 | } | |
317 | ||
318 | ||
7f86f058 | 319 | /* Implement the "current_sos" target_so_ops method. */ |
c4d10515 KB |
320 | |
321 | static struct so_list * | |
322 | frv_current_sos (void) | |
323 | { | |
f5656ead | 324 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
325 | CORE_ADDR lm_addr, mgot; |
326 | struct so_list *sos_head = NULL; | |
327 | struct so_list **sos_next_ptr = &sos_head; | |
328 | ||
7c699b81 KB |
329 | /* Make sure that the main executable has been relocated. This is |
330 | required in order to find the address of the global offset table, | |
331 | which in turn is used to find the link map info. (See lm_base() | |
332 | for details.) | |
333 | ||
334 | Note that the relocation of the main executable is also performed | |
4d1eb6b4 | 335 | by solib_create_inferior_hook(), however, in the case of core |
7c699b81 | 336 | files, this hook is called too late in order to be of benefit to |
4d1eb6b4 | 337 | solib_add. solib_add eventually calls this this function, |
7c699b81 | 338 | frv_current_sos, and also precedes the call to |
4d1eb6b4 | 339 | solib_create_inferior_hook(). (See post_create_inferior() in |
7c699b81 KB |
340 | infcmd.c.) */ |
341 | if (main_executable_lm_info == 0 && core_bfd != NULL) | |
342 | frv_relocate_main_executable (); | |
343 | ||
344 | /* Fetch the GOT corresponding to the main executable. */ | |
c4d10515 KB |
345 | mgot = main_got (); |
346 | ||
347 | /* Locate the address of the first link map struct. */ | |
348 | lm_addr = lm_base (); | |
349 | ||
b021a221 | 350 | /* We have at least one link map entry. Fetch the lot of them, |
c4d10515 KB |
351 | building the solist chain. */ |
352 | while (lm_addr) | |
353 | { | |
354 | struct ext_link_map lm_buf; | |
355 | CORE_ADDR got_addr; | |
356 | ||
357 | if (solib_frv_debug) | |
358 | fprintf_unfiltered (gdb_stdlog, | |
359 | "current_sos: reading link_map entry at %s\n", | |
bb599908 | 360 | hex_string_custom (lm_addr, 8)); |
c4d10515 | 361 | |
3e43a32a MS |
362 | if (target_read_memory (lm_addr, (gdb_byte *) &lm_buf, |
363 | sizeof (lm_buf)) != 0) | |
c4d10515 | 364 | { |
3e43a32a MS |
365 | warning (_("frv_current_sos: Unable to read link map entry. " |
366 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
367 | break; |
368 | } | |
369 | ||
370 | got_addr | |
e2b7c966 | 371 | = extract_unsigned_integer (lm_buf.l_addr.got_value, |
e17a4113 UW |
372 | sizeof (lm_buf.l_addr.got_value), |
373 | byte_order); | |
c4d10515 KB |
374 | /* If the got_addr is the same as mgotr, then we're looking at the |
375 | entry for the main executable. By convention, we don't include | |
376 | this in the list of shared objects. */ | |
377 | if (got_addr != mgot) | |
378 | { | |
c4d10515 KB |
379 | struct int_elf32_fdpic_loadmap *loadmap; |
380 | struct so_list *sop; | |
381 | CORE_ADDR addr; | |
382 | ||
383 | /* Fetch the load map address. */ | |
e2b7c966 | 384 | addr = extract_unsigned_integer (lm_buf.l_addr.map, |
e17a4113 UW |
385 | sizeof lm_buf.l_addr.map, |
386 | byte_order); | |
c4d10515 KB |
387 | loadmap = fetch_loadmap (addr); |
388 | if (loadmap == NULL) | |
389 | { | |
3e43a32a MS |
390 | warning (_("frv_current_sos: Unable to fetch load map. " |
391 | "Shared object chain may be incomplete.")); | |
c4d10515 KB |
392 | break; |
393 | } | |
394 | ||
8d749320 | 395 | sop = XCNEW (struct so_list); |
4023ae76 | 396 | lm_info_frv *li = new lm_info_frv; |
d0e449a1 SM |
397 | sop->lm_info = li; |
398 | li->map = loadmap; | |
399 | li->got_value = got_addr; | |
400 | li->lm_addr = lm_addr; | |
c4d10515 | 401 | /* Fetch the name. */ |
e2b7c966 | 402 | addr = extract_unsigned_integer (lm_buf.l_name, |
e17a4113 UW |
403 | sizeof (lm_buf.l_name), |
404 | byte_order); | |
66920317 TT |
405 | gdb::unique_xmalloc_ptr<char> name_buf |
406 | = target_read_string (addr, SO_NAME_MAX_PATH_SIZE - 1); | |
c4d10515 KB |
407 | |
408 | if (solib_frv_debug) | |
409 | fprintf_unfiltered (gdb_stdlog, "current_sos: name = %s\n", | |
e83e4e24 | 410 | name_buf.get ()); |
c4d10515 | 411 | |
66920317 TT |
412 | if (name_buf == nullptr) |
413 | warning (_("Can't read pathname for link map entry.")); | |
c4d10515 KB |
414 | else |
415 | { | |
e83e4e24 TT |
416 | strncpy (sop->so_name, name_buf.get (), |
417 | SO_NAME_MAX_PATH_SIZE - 1); | |
c4d10515 | 418 | sop->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
c4d10515 KB |
419 | strcpy (sop->so_original_name, sop->so_name); |
420 | } | |
421 | ||
422 | *sos_next_ptr = sop; | |
423 | sos_next_ptr = &sop->next; | |
424 | } | |
186993b4 KB |
425 | else |
426 | { | |
427 | main_lm_addr = lm_addr; | |
428 | } | |
c4d10515 | 429 | |
e17a4113 UW |
430 | lm_addr = extract_unsigned_integer (lm_buf.l_next, |
431 | sizeof (lm_buf.l_next), byte_order); | |
c4d10515 KB |
432 | } |
433 | ||
434 | enable_break2 (); | |
435 | ||
436 | return sos_head; | |
437 | } | |
438 | ||
439 | ||
440 | /* Return 1 if PC lies in the dynamic symbol resolution code of the | |
441 | run time loader. */ | |
442 | ||
443 | static CORE_ADDR interp_text_sect_low; | |
444 | static CORE_ADDR interp_text_sect_high; | |
445 | static CORE_ADDR interp_plt_sect_low; | |
446 | static CORE_ADDR interp_plt_sect_high; | |
447 | ||
448 | static int | |
449 | frv_in_dynsym_resolve_code (CORE_ADDR pc) | |
450 | { | |
451 | return ((pc >= interp_text_sect_low && pc < interp_text_sect_high) | |
452 | || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high) | |
3e5d3a5a | 453 | || in_plt_section (pc)); |
c4d10515 KB |
454 | } |
455 | ||
456 | /* Given a loadmap and an address, return the displacement needed | |
457 | to relocate the address. */ | |
458 | ||
63807e1d | 459 | static CORE_ADDR |
c4d10515 KB |
460 | displacement_from_map (struct int_elf32_fdpic_loadmap *map, |
461 | CORE_ADDR addr) | |
462 | { | |
463 | int seg; | |
464 | ||
465 | for (seg = 0; seg < map->nsegs; seg++) | |
466 | { | |
467 | if (map->segs[seg].p_vaddr <= addr | |
468 | && addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
469 | { | |
470 | return map->segs[seg].addr - map->segs[seg].p_vaddr; | |
471 | } | |
472 | } | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /* Print a warning about being unable to set the dynamic linker | |
478 | breakpoint. */ | |
479 | ||
480 | static void | |
481 | enable_break_failure_warning (void) | |
482 | { | |
8a3fe4f8 | 483 | warning (_("Unable to find dynamic linker breakpoint function.\n" |
c4d10515 | 484 | "GDB will be unable to debug shared library initializers\n" |
8a3fe4f8 | 485 | "and track explicitly loaded dynamic code.")); |
c4d10515 KB |
486 | } |
487 | ||
cb457ae2 YQ |
488 | /* Helper function for gdb_bfd_lookup_symbol. */ |
489 | ||
490 | static int | |
3953f15c | 491 | cmp_name (const asymbol *sym, const void *data) |
cb457ae2 YQ |
492 | { |
493 | return (strcmp (sym->name, (const char *) data) == 0); | |
494 | } | |
495 | ||
7f86f058 | 496 | /* Arrange for dynamic linker to hit breakpoint. |
c4d10515 KB |
497 | |
498 | The dynamic linkers has, as part of its debugger interface, support | |
499 | for arranging for the inferior to hit a breakpoint after mapping in | |
500 | the shared libraries. This function enables that breakpoint. | |
501 | ||
502 | On the FR-V, using the shared library (FDPIC) ABI, the symbol | |
503 | _dl_debug_addr points to the r_debug struct which contains | |
504 | a field called r_brk. r_brk is the address of the function | |
505 | descriptor upon which a breakpoint must be placed. Being a | |
506 | function descriptor, we must extract the entry point in order | |
507 | to set the breakpoint. | |
508 | ||
509 | Our strategy will be to get the .interp section from the | |
510 | executable. This section will provide us with the name of the | |
511 | interpreter. We'll open the interpreter and then look up | |
512 | the address of _dl_debug_addr. We then relocate this address | |
513 | using the interpreter's loadmap. Once the relocated address | |
514 | is known, we fetch the value (address) corresponding to r_brk | |
515 | and then use that value to fetch the entry point of the function | |
7f86f058 | 516 | we're interested in. */ |
c4d10515 | 517 | |
c4d10515 KB |
518 | static int enable_break2_done = 0; |
519 | ||
520 | static int | |
521 | enable_break2 (void) | |
522 | { | |
f5656ead | 523 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
524 | asection *interp_sect; |
525 | ||
cb7db0f2 | 526 | if (enable_break2_done) |
c4d10515 KB |
527 | return 1; |
528 | ||
c4d10515 KB |
529 | interp_text_sect_low = interp_text_sect_high = 0; |
530 | interp_plt_sect_low = interp_plt_sect_high = 0; | |
531 | ||
532 | /* Find the .interp section; if not found, warn the user and drop | |
533 | into the old breakpoint at symbol code. */ | |
534 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
535 | if (interp_sect) | |
536 | { | |
537 | unsigned int interp_sect_size; | |
001f13d8 | 538 | char *buf; |
c4d10515 KB |
539 | int status; |
540 | CORE_ADDR addr, interp_loadmap_addr; | |
e2b7c966 | 541 | gdb_byte addr_buf[FRV_PTR_SIZE]; |
c4d10515 KB |
542 | struct int_elf32_fdpic_loadmap *ldm; |
543 | ||
544 | /* Read the contents of the .interp section into a local buffer; | |
545 | the contents specify the dynamic linker this program uses. */ | |
fd361982 | 546 | interp_sect_size = bfd_section_size (interp_sect); |
224c3ddb | 547 | buf = (char *) alloca (interp_sect_size); |
c4d10515 KB |
548 | bfd_get_section_contents (exec_bfd, interp_sect, |
549 | buf, 0, interp_sect_size); | |
550 | ||
551 | /* Now we need to figure out where the dynamic linker was | |
552 | loaded so that we can load its symbols and place a breakpoint | |
553 | in the dynamic linker itself. | |
554 | ||
555 | This address is stored on the stack. However, I've been unable | |
556 | to find any magic formula to find it for Solaris (appears to | |
557 | be trivial on GNU/Linux). Therefore, we have to try an alternate | |
558 | mechanism to find the dynamic linker's base address. */ | |
559 | ||
192b62ce | 560 | gdb_bfd_ref_ptr tmp_bfd; |
a70b8144 | 561 | try |
f1838a98 UW |
562 | { |
563 | tmp_bfd = solib_bfd_open (buf); | |
564 | } | |
230d2906 | 565 | catch (const gdb_exception &ex) |
492d29ea PA |
566 | { |
567 | } | |
492d29ea | 568 | |
c4d10515 KB |
569 | if (tmp_bfd == NULL) |
570 | { | |
571 | enable_break_failure_warning (); | |
572 | return 0; | |
573 | } | |
574 | ||
f5656ead | 575 | status = frv_fdpic_loadmap_addresses (target_gdbarch (), |
c4d10515 KB |
576 | &interp_loadmap_addr, 0); |
577 | if (status < 0) | |
578 | { | |
8a3fe4f8 | 579 | warning (_("Unable to determine dynamic linker loadmap address.")); |
c4d10515 | 580 | enable_break_failure_warning (); |
c4d10515 KB |
581 | return 0; |
582 | } | |
583 | ||
584 | if (solib_frv_debug) | |
585 | fprintf_unfiltered (gdb_stdlog, | |
586 | "enable_break: interp_loadmap_addr = %s\n", | |
bb599908 | 587 | hex_string_custom (interp_loadmap_addr, 8)); |
c4d10515 KB |
588 | |
589 | ldm = fetch_loadmap (interp_loadmap_addr); | |
590 | if (ldm == NULL) | |
591 | { | |
8a3fe4f8 | 592 | warning (_("Unable to load dynamic linker loadmap at address %s."), |
bb599908 | 593 | hex_string_custom (interp_loadmap_addr, 8)); |
c4d10515 | 594 | enable_break_failure_warning (); |
c4d10515 KB |
595 | return 0; |
596 | } | |
597 | ||
598 | /* Record the relocated start and end address of the dynamic linker | |
599 | text and plt section for svr4_in_dynsym_resolve_code. */ | |
192b62ce | 600 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".text"); |
c4d10515 KB |
601 | if (interp_sect) |
602 | { | |
fd361982 | 603 | interp_text_sect_low = bfd_section_vma (interp_sect); |
c4d10515 KB |
604 | interp_text_sect_low |
605 | += displacement_from_map (ldm, interp_text_sect_low); | |
606 | interp_text_sect_high | |
fd361982 | 607 | = interp_text_sect_low + bfd_section_size (interp_sect); |
c4d10515 | 608 | } |
192b62ce | 609 | interp_sect = bfd_get_section_by_name (tmp_bfd.get (), ".plt"); |
c4d10515 KB |
610 | if (interp_sect) |
611 | { | |
fd361982 | 612 | interp_plt_sect_low = bfd_section_vma (interp_sect); |
c4d10515 KB |
613 | interp_plt_sect_low |
614 | += displacement_from_map (ldm, interp_plt_sect_low); | |
615 | interp_plt_sect_high = | |
fd361982 | 616 | interp_plt_sect_low + bfd_section_size (interp_sect); |
c4d10515 KB |
617 | } |
618 | ||
192b62ce | 619 | addr = gdb_bfd_lookup_symbol (tmp_bfd.get (), cmp_name, "_dl_debug_addr"); |
cb457ae2 | 620 | |
c4d10515 KB |
621 | if (addr == 0) |
622 | { | |
3e43a32a MS |
623 | warning (_("Could not find symbol _dl_debug_addr " |
624 | "in dynamic linker")); | |
c4d10515 | 625 | enable_break_failure_warning (); |
c4d10515 KB |
626 | return 0; |
627 | } | |
628 | ||
629 | if (solib_frv_debug) | |
630 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
631 | "enable_break: _dl_debug_addr " |
632 | "(prior to relocation) = %s\n", | |
bb599908 | 633 | hex_string_custom (addr, 8)); |
c4d10515 KB |
634 | |
635 | addr += displacement_from_map (ldm, addr); | |
636 | ||
637 | if (solib_frv_debug) | |
638 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
639 | "enable_break: _dl_debug_addr " |
640 | "(after relocation) = %s\n", | |
bb599908 | 641 | hex_string_custom (addr, 8)); |
c4d10515 KB |
642 | |
643 | /* Fetch the address of the r_debug struct. */ | |
644 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
645 | { | |
3e43a32a MS |
646 | warning (_("Unable to fetch contents of _dl_debug_addr " |
647 | "(at address %s) from dynamic linker"), | |
bb599908 | 648 | hex_string_custom (addr, 8)); |
c4d10515 | 649 | } |
e17a4113 | 650 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 | 651 | |
cb7db0f2 MF |
652 | if (solib_frv_debug) |
653 | fprintf_unfiltered (gdb_stdlog, | |
654 | "enable_break: _dl_debug_addr[0..3] = %s\n", | |
655 | hex_string_custom (addr, 8)); | |
656 | ||
657 | /* If it's zero, then the ldso hasn't initialized yet, and so | |
658 | there are no shared libs yet loaded. */ | |
659 | if (addr == 0) | |
660 | { | |
661 | if (solib_frv_debug) | |
662 | fprintf_unfiltered (gdb_stdlog, | |
663 | "enable_break: ldso not yet initialized\n"); | |
664 | /* Do not warn, but mark to run again. */ | |
665 | return 0; | |
666 | } | |
667 | ||
c4d10515 KB |
668 | /* Fetch the r_brk field. It's 8 bytes from the start of |
669 | _dl_debug_addr. */ | |
670 | if (target_read_memory (addr + 8, addr_buf, sizeof addr_buf) != 0) | |
671 | { | |
3e43a32a MS |
672 | warning (_("Unable to fetch _dl_debug_addr->r_brk " |
673 | "(at address %s) from dynamic linker"), | |
bb599908 | 674 | hex_string_custom (addr + 8, 8)); |
c4d10515 | 675 | enable_break_failure_warning (); |
c4d10515 KB |
676 | return 0; |
677 | } | |
e17a4113 | 678 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 KB |
679 | |
680 | /* Now fetch the function entry point. */ | |
681 | if (target_read_memory (addr, addr_buf, sizeof addr_buf) != 0) | |
682 | { | |
3e43a32a MS |
683 | warning (_("Unable to fetch _dl_debug_addr->.r_brk entry point " |
684 | "(at address %s) from dynamic linker"), | |
bb599908 | 685 | hex_string_custom (addr, 8)); |
c4d10515 | 686 | enable_break_failure_warning (); |
c4d10515 KB |
687 | return 0; |
688 | } | |
e17a4113 | 689 | addr = extract_unsigned_integer (addr_buf, sizeof addr_buf, byte_order); |
c4d10515 | 690 | |
192b62ce | 691 | /* We're done with the loadmap. */ |
c4d10515 KB |
692 | xfree (ldm); |
693 | ||
cb7db0f2 MF |
694 | /* Remove all the solib event breakpoints. Their addresses |
695 | may have changed since the last time we ran the program. */ | |
696 | remove_solib_event_breakpoints (); | |
697 | ||
c4d10515 | 698 | /* Now (finally!) create the solib breakpoint. */ |
f5656ead | 699 | create_solib_event_breakpoint (target_gdbarch (), addr); |
c4d10515 | 700 | |
cb7db0f2 MF |
701 | enable_break2_done = 1; |
702 | ||
c4d10515 KB |
703 | return 1; |
704 | } | |
705 | ||
706 | /* Tell the user we couldn't set a dynamic linker breakpoint. */ | |
707 | enable_break_failure_warning (); | |
708 | ||
709 | /* Failure return. */ | |
710 | return 0; | |
711 | } | |
712 | ||
713 | static int | |
714 | enable_break (void) | |
715 | { | |
716 | asection *interp_sect; | |
d56e56aa | 717 | CORE_ADDR entry_point; |
c4d10515 | 718 | |
abd0a5fa | 719 | if (symfile_objfile == NULL) |
c4d10515 | 720 | { |
abd0a5fa JK |
721 | if (solib_frv_debug) |
722 | fprintf_unfiltered (gdb_stdlog, | |
723 | "enable_break: No symbol file found.\n"); | |
724 | return 0; | |
725 | } | |
c4d10515 | 726 | |
d56e56aa | 727 | if (!entry_point_address_query (&entry_point)) |
abd0a5fa | 728 | { |
c4d10515 KB |
729 | if (solib_frv_debug) |
730 | fprintf_unfiltered (gdb_stdlog, | |
abd0a5fa JK |
731 | "enable_break: Symbol file has no entry point.\n"); |
732 | return 0; | |
c4d10515 | 733 | } |
abd0a5fa JK |
734 | |
735 | /* Check for the presence of a .interp section. If there is no | |
736 | such section, the executable is statically linked. */ | |
737 | ||
738 | interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); | |
739 | ||
740 | if (interp_sect == NULL) | |
c4d10515 KB |
741 | { |
742 | if (solib_frv_debug) | |
743 | fprintf_unfiltered (gdb_stdlog, | |
abd0a5fa JK |
744 | "enable_break: No .interp section found.\n"); |
745 | return 0; | |
c4d10515 KB |
746 | } |
747 | ||
d56e56aa | 748 | create_solib_event_breakpoint (target_gdbarch (), entry_point); |
abd0a5fa JK |
749 | |
750 | if (solib_frv_debug) | |
751 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
752 | "enable_break: solib event breakpoint " |
753 | "placed at entry point: %s\n", | |
d56e56aa | 754 | hex_string_custom (entry_point, 8)); |
c4d10515 KB |
755 | return 1; |
756 | } | |
757 | ||
c4d10515 KB |
758 | static void |
759 | frv_relocate_main_executable (void) | |
760 | { | |
761 | int status; | |
9bc7b6c6 | 762 | CORE_ADDR exec_addr, interp_addr; |
c4d10515 | 763 | struct int_elf32_fdpic_loadmap *ldm; |
c4d10515 KB |
764 | int changed; |
765 | struct obj_section *osect; | |
766 | ||
f5656ead | 767 | status = frv_fdpic_loadmap_addresses (target_gdbarch (), |
9bc7b6c6 | 768 | &interp_addr, &exec_addr); |
c4d10515 | 769 | |
9bc7b6c6 | 770 | if (status < 0 || (exec_addr == 0 && interp_addr == 0)) |
c4d10515 KB |
771 | { |
772 | /* Not using FDPIC ABI, so do nothing. */ | |
773 | return; | |
774 | } | |
775 | ||
776 | /* Fetch the loadmap located at ``exec_addr''. */ | |
777 | ldm = fetch_loadmap (exec_addr); | |
778 | if (ldm == NULL) | |
8a3fe4f8 | 779 | error (_("Unable to load the executable's loadmap.")); |
c4d10515 | 780 | |
4023ae76 SM |
781 | delete main_executable_lm_info; |
782 | main_executable_lm_info = new lm_info_frv; | |
c4d10515 KB |
783 | main_executable_lm_info->map = ldm; |
784 | ||
6a053cb1 | 785 | section_offsets new_offsets (symfile_objfile->section_offsets.size ()); |
c4d10515 KB |
786 | changed = 0; |
787 | ||
788 | ALL_OBJFILE_OSECTIONS (symfile_objfile, osect) | |
789 | { | |
790 | CORE_ADDR orig_addr, addr, offset; | |
791 | int osect_idx; | |
792 | int seg; | |
793 | ||
65cf3563 | 794 | osect_idx = osect - symfile_objfile->sections; |
c4d10515 KB |
795 | |
796 | /* Current address of section. */ | |
aded6f54 | 797 | addr = obj_section_addr (osect); |
c4d10515 | 798 | /* Offset from where this section started. */ |
6a053cb1 | 799 | offset = symfile_objfile->section_offsets[osect_idx]; |
c4d10515 KB |
800 | /* Original address prior to any past relocations. */ |
801 | orig_addr = addr - offset; | |
802 | ||
803 | for (seg = 0; seg < ldm->nsegs; seg++) | |
804 | { | |
805 | if (ldm->segs[seg].p_vaddr <= orig_addr | |
806 | && orig_addr < ldm->segs[seg].p_vaddr + ldm->segs[seg].p_memsz) | |
807 | { | |
6a053cb1 | 808 | new_offsets[osect_idx] |
c4d10515 KB |
809 | = ldm->segs[seg].addr - ldm->segs[seg].p_vaddr; |
810 | ||
6a053cb1 | 811 | if (new_offsets[osect_idx] != offset) |
c4d10515 KB |
812 | changed = 1; |
813 | break; | |
814 | } | |
815 | } | |
816 | } | |
817 | ||
818 | if (changed) | |
6a053cb1 | 819 | objfile_relocate (symfile_objfile, new_offsets); |
c4d10515 KB |
820 | |
821 | /* Now that symfile_objfile has been relocated, we can compute the | |
822 | GOT value and stash it away. */ | |
823 | main_executable_lm_info->got_value = main_got (); | |
824 | } | |
825 | ||
7f86f058 | 826 | /* Implement the "create_inferior_hook" target_solib_ops method. |
c4d10515 | 827 | |
7f86f058 PA |
828 | For the FR-V shared library ABI (FDPIC), the main executable needs |
829 | to be relocated. The shared library breakpoints also need to be | |
830 | enabled. */ | |
c4d10515 KB |
831 | |
832 | static void | |
268a4a75 | 833 | frv_solib_create_inferior_hook (int from_tty) |
c4d10515 KB |
834 | { |
835 | /* Relocate main executable. */ | |
836 | frv_relocate_main_executable (); | |
837 | ||
838 | /* Enable shared library breakpoints. */ | |
839 | if (!enable_break ()) | |
840 | { | |
8a3fe4f8 | 841 | warning (_("shared library handler failed to enable breakpoint")); |
c4d10515 KB |
842 | return; |
843 | } | |
844 | } | |
845 | ||
846 | static void | |
847 | frv_clear_solib (void) | |
848 | { | |
849 | lm_base_cache = 0; | |
c4d10515 | 850 | enable_break2_done = 0; |
186993b4 | 851 | main_lm_addr = 0; |
4023ae76 SM |
852 | |
853 | delete main_executable_lm_info; | |
854 | main_executable_lm_info = NULL; | |
c4d10515 KB |
855 | } |
856 | ||
857 | static void | |
858 | frv_free_so (struct so_list *so) | |
859 | { | |
d0e449a1 SM |
860 | lm_info_frv *li = (lm_info_frv *) so->lm_info; |
861 | ||
4023ae76 | 862 | delete li; |
c4d10515 KB |
863 | } |
864 | ||
865 | static void | |
866 | frv_relocate_section_addresses (struct so_list *so, | |
0542c86d | 867 | struct target_section *sec) |
c4d10515 KB |
868 | { |
869 | int seg; | |
d0e449a1 SM |
870 | lm_info_frv *li = (lm_info_frv *) so->lm_info; |
871 | int_elf32_fdpic_loadmap *map = li->map; | |
c4d10515 KB |
872 | |
873 | for (seg = 0; seg < map->nsegs; seg++) | |
874 | { | |
875 | if (map->segs[seg].p_vaddr <= sec->addr | |
876 | && sec->addr < map->segs[seg].p_vaddr + map->segs[seg].p_memsz) | |
877 | { | |
878 | CORE_ADDR displ = map->segs[seg].addr - map->segs[seg].p_vaddr; | |
433759f7 | 879 | |
c4d10515 KB |
880 | sec->addr += displ; |
881 | sec->endaddr += displ; | |
882 | break; | |
883 | } | |
884 | } | |
885 | } | |
886 | ||
887 | /* Return the GOT address associated with the main executable. Return | |
888 | 0 if it can't be found. */ | |
889 | ||
890 | static CORE_ADDR | |
891 | main_got (void) | |
892 | { | |
3b7344d5 | 893 | struct bound_minimal_symbol got_sym; |
c4d10515 | 894 | |
3e43a32a MS |
895 | got_sym = lookup_minimal_symbol ("_GLOBAL_OFFSET_TABLE_", |
896 | NULL, symfile_objfile); | |
3b7344d5 | 897 | if (got_sym.minsym == 0) |
c4d10515 KB |
898 | return 0; |
899 | ||
77e371c0 | 900 | return BMSYMBOL_VALUE_ADDRESS (got_sym); |
c4d10515 KB |
901 | } |
902 | ||
903 | /* Find the global pointer for the given function address ADDR. */ | |
904 | ||
905 | CORE_ADDR | |
906 | frv_fdpic_find_global_pointer (CORE_ADDR addr) | |
907 | { | |
a1fd1ac9 | 908 | for (struct so_list *so : current_program_space->solibs ()) |
c4d10515 KB |
909 | { |
910 | int seg; | |
d0e449a1 SM |
911 | lm_info_frv *li = (lm_info_frv *) so->lm_info; |
912 | int_elf32_fdpic_loadmap *map = li->map; | |
c4d10515 KB |
913 | |
914 | for (seg = 0; seg < map->nsegs; seg++) | |
915 | { | |
916 | if (map->segs[seg].addr <= addr | |
917 | && addr < map->segs[seg].addr + map->segs[seg].p_memsz) | |
d0e449a1 | 918 | return li->got_value; |
c4d10515 | 919 | } |
c4d10515 KB |
920 | } |
921 | ||
7a9dd1b2 | 922 | /* Didn't find it in any of the shared objects. So assume it's in the |
c4d10515 KB |
923 | main executable. */ |
924 | return main_got (); | |
925 | } | |
926 | ||
927 | /* Forward declarations for frv_fdpic_find_canonical_descriptor(). */ | |
928 | static CORE_ADDR find_canonical_descriptor_in_load_object | |
d0e449a1 | 929 | (CORE_ADDR, CORE_ADDR, const char *, bfd *, lm_info_frv *); |
c4d10515 KB |
930 | |
931 | /* Given a function entry point, attempt to find the canonical descriptor | |
932 | associated with that entry point. Return 0 if no canonical descriptor | |
933 | could be found. */ | |
934 | ||
935 | CORE_ADDR | |
936 | frv_fdpic_find_canonical_descriptor (CORE_ADDR entry_point) | |
937 | { | |
0d5cff50 | 938 | const char *name; |
c4d10515 KB |
939 | CORE_ADDR addr; |
940 | CORE_ADDR got_value; | |
c4d10515 | 941 | struct symbol *sym; |
c4d10515 KB |
942 | |
943 | /* Fetch the corresponding global pointer for the entry point. */ | |
944 | got_value = frv_fdpic_find_global_pointer (entry_point); | |
945 | ||
946 | /* Attempt to find the name of the function. If the name is available, | |
947 | it'll be used as an aid in finding matching functions in the dynamic | |
948 | symbol table. */ | |
949 | sym = find_pc_function (entry_point); | |
950 | if (sym == 0) | |
951 | name = 0; | |
952 | else | |
987012b8 | 953 | name = sym->linkage_name (); |
c4d10515 KB |
954 | |
955 | /* Check the main executable. */ | |
956 | addr = find_canonical_descriptor_in_load_object | |
957 | (entry_point, got_value, name, symfile_objfile->obfd, | |
958 | main_executable_lm_info); | |
959 | ||
960 | /* If descriptor not found via main executable, check each load object | |
961 | in list of shared objects. */ | |
962 | if (addr == 0) | |
963 | { | |
a1fd1ac9 | 964 | for (struct so_list *so : current_program_space->solibs ()) |
c4d10515 | 965 | { |
d0e449a1 SM |
966 | lm_info_frv *li = (lm_info_frv *) so->lm_info; |
967 | ||
c4d10515 | 968 | addr = find_canonical_descriptor_in_load_object |
d0e449a1 | 969 | (entry_point, got_value, name, so->abfd, li); |
c4d10515 KB |
970 | |
971 | if (addr != 0) | |
972 | break; | |
c4d10515 KB |
973 | } |
974 | } | |
975 | ||
976 | return addr; | |
977 | } | |
978 | ||
979 | static CORE_ADDR | |
980 | find_canonical_descriptor_in_load_object | |
0d5cff50 | 981 | (CORE_ADDR entry_point, CORE_ADDR got_value, const char *name, bfd *abfd, |
d0e449a1 | 982 | lm_info_frv *lm) |
c4d10515 | 983 | { |
f5656ead | 984 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
c4d10515 KB |
985 | arelent *rel; |
986 | unsigned int i; | |
987 | CORE_ADDR addr = 0; | |
988 | ||
989 | /* Nothing to do if no bfd. */ | |
990 | if (abfd == 0) | |
991 | return 0; | |
992 | ||
35e08e03 KB |
993 | /* Nothing to do if no link map. */ |
994 | if (lm == 0) | |
995 | return 0; | |
996 | ||
c4d10515 KB |
997 | /* We want to scan the dynamic relocs for R_FRV_FUNCDESC relocations. |
998 | (More about this later.) But in order to fetch the relocs, we | |
999 | need to first fetch the dynamic symbols. These symbols need to | |
1000 | be cached due to the way that bfd_canonicalize_dynamic_reloc() | |
1001 | works. (See the comments in the declaration of struct lm_info | |
1002 | for more information.) */ | |
1003 | if (lm->dyn_syms == NULL) | |
1004 | { | |
1005 | long storage_needed; | |
1006 | unsigned int number_of_symbols; | |
1007 | ||
1008 | /* Determine amount of space needed to hold the dynamic symbol table. */ | |
1009 | storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd); | |
1010 | ||
1011 | /* If there are no dynamic symbols, there's nothing to do. */ | |
1012 | if (storage_needed <= 0) | |
1013 | return 0; | |
1014 | ||
1015 | /* Allocate space for the dynamic symbol table. */ | |
1016 | lm->dyn_syms = (asymbol **) xmalloc (storage_needed); | |
1017 | ||
1018 | /* Fetch the dynamic symbol table. */ | |
1019 | number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd, lm->dyn_syms); | |
1020 | ||
1021 | if (number_of_symbols == 0) | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | /* Fetch the dynamic relocations if not already cached. */ | |
1026 | if (lm->dyn_relocs == NULL) | |
1027 | { | |
1028 | long storage_needed; | |
1029 | ||
1030 | /* Determine amount of space needed to hold the dynamic relocs. */ | |
1031 | storage_needed = bfd_get_dynamic_reloc_upper_bound (abfd); | |
1032 | ||
1033 | /* Bail out if there are no dynamic relocs. */ | |
1034 | if (storage_needed <= 0) | |
1035 | return 0; | |
1036 | ||
1037 | /* Allocate space for the relocs. */ | |
1038 | lm->dyn_relocs = (arelent **) xmalloc (storage_needed); | |
1039 | ||
1040 | /* Fetch the dynamic relocs. */ | |
1041 | lm->dyn_reloc_count | |
1042 | = bfd_canonicalize_dynamic_reloc (abfd, lm->dyn_relocs, lm->dyn_syms); | |
1043 | } | |
1044 | ||
1045 | /* Search the dynamic relocs. */ | |
1046 | for (i = 0; i < lm->dyn_reloc_count; i++) | |
1047 | { | |
1048 | rel = lm->dyn_relocs[i]; | |
1049 | ||
1050 | /* Relocs of interest are those which meet the following | |
1051 | criteria: | |
1052 | ||
1053 | - the names match (assuming the caller could provide | |
1054 | a name which matches ``entry_point''). | |
1055 | - the relocation type must be R_FRV_FUNCDESC. Relocs | |
1056 | of this type are used (by the dynamic linker) to | |
1057 | look up the address of a canonical descriptor (allocating | |
1058 | it if need be) and initializing the GOT entry referred | |
1059 | to by the offset to the address of the descriptor. | |
1060 | ||
1061 | These relocs of interest may be used to obtain a | |
1062 | candidate descriptor by first adjusting the reloc's | |
1063 | address according to the link map and then dereferencing | |
1064 | this address (which is a GOT entry) to obtain a descriptor | |
1065 | address. */ | |
1066 | if ((name == 0 || strcmp (name, (*rel->sym_ptr_ptr)->name) == 0) | |
1067 | && rel->howto->type == R_FRV_FUNCDESC) | |
1068 | { | |
e2b7c966 | 1069 | gdb_byte buf [FRV_PTR_SIZE]; |
c4d10515 KB |
1070 | |
1071 | /* Compute address of address of candidate descriptor. */ | |
1072 | addr = rel->address + displacement_from_map (lm->map, rel->address); | |
1073 | ||
1074 | /* Fetch address of candidate descriptor. */ | |
1075 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1076 | continue; | |
e17a4113 | 1077 | addr = extract_unsigned_integer (buf, sizeof buf, byte_order); |
c4d10515 KB |
1078 | |
1079 | /* Check for matching entry point. */ | |
1080 | if (target_read_memory (addr, buf, sizeof buf) != 0) | |
1081 | continue; | |
e17a4113 UW |
1082 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1083 | != entry_point) | |
c4d10515 KB |
1084 | continue; |
1085 | ||
1086 | /* Check for matching got value. */ | |
1087 | if (target_read_memory (addr + 4, buf, sizeof buf) != 0) | |
1088 | continue; | |
e17a4113 UW |
1089 | if (extract_unsigned_integer (buf, sizeof buf, byte_order) |
1090 | != got_value) | |
c4d10515 KB |
1091 | continue; |
1092 | ||
1093 | /* Match was successful! Exit loop. */ | |
1094 | break; | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | return addr; | |
1099 | } | |
1100 | ||
186993b4 KB |
1101 | /* Given an objfile, return the address of its link map. This value is |
1102 | needed for TLS support. */ | |
1103 | CORE_ADDR | |
1104 | frv_fetch_objfile_link_map (struct objfile *objfile) | |
1105 | { | |
186993b4 KB |
1106 | /* Cause frv_current_sos() to be run if it hasn't been already. */ |
1107 | if (main_lm_addr == 0) | |
e696b3ad | 1108 | solib_add (0, 0, 1); |
186993b4 KB |
1109 | |
1110 | /* frv_current_sos() will set main_lm_addr for the main executable. */ | |
1111 | if (objfile == symfile_objfile) | |
1112 | return main_lm_addr; | |
1113 | ||
1114 | /* The other link map addresses may be found by examining the list | |
1115 | of shared libraries. */ | |
a1fd1ac9 | 1116 | for (struct so_list *so : current_program_space->solibs ()) |
186993b4 | 1117 | { |
d0e449a1 SM |
1118 | lm_info_frv *li = (lm_info_frv *) so->lm_info; |
1119 | ||
186993b4 | 1120 | if (so->objfile == objfile) |
d0e449a1 | 1121 | return li->lm_addr; |
186993b4 KB |
1122 | } |
1123 | ||
1124 | /* Not found! */ | |
1125 | return 0; | |
1126 | } | |
1127 | ||
917630e4 | 1128 | struct target_so_ops frv_so_ops; |
c4d10515 | 1129 | |
6c265988 | 1130 | void _initialize_frv_solib (); |
c4d10515 | 1131 | void |
6c265988 | 1132 | _initialize_frv_solib () |
c4d10515 KB |
1133 | { |
1134 | frv_so_ops.relocate_section_addresses = frv_relocate_section_addresses; | |
1135 | frv_so_ops.free_so = frv_free_so; | |
1136 | frv_so_ops.clear_solib = frv_clear_solib; | |
1137 | frv_so_ops.solib_create_inferior_hook = frv_solib_create_inferior_hook; | |
c4d10515 KB |
1138 | frv_so_ops.current_sos = frv_current_sos; |
1139 | frv_so_ops.open_symbol_file_object = open_symbol_file_object; | |
1140 | frv_so_ops.in_dynsym_resolve_code = frv_in_dynsym_resolve_code; | |
831a0c44 | 1141 | frv_so_ops.bfd_open = solib_bfd_open; |
c4d10515 | 1142 | |
c4d10515 | 1143 | /* Debug this file's internals. */ |
ccce17b0 YQ |
1144 | add_setshow_zuinteger_cmd ("solib-frv", class_maintenance, |
1145 | &solib_frv_debug, _("\ | |
85c07804 AC |
1146 | Set internal debugging of shared library code for FR-V."), _("\ |
1147 | Show internal debugging of shared library code for FR-V."), _("\ | |
1148 | When non-zero, FR-V solib specific internal debugging is enabled."), | |
ccce17b0 YQ |
1149 | NULL, |
1150 | NULL, /* FIXME: i18n: */ | |
1151 | &setdebuglist, &showdebuglist); | |
c4d10515 | 1152 | } |