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85e747d2 | 1 | /* Cell SPU GNU/Linux support -- shared library handling. |
4c38e0a4 | 2 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
85e747d2 UW |
3 | |
4 | Contributed by Ulrich Weigand <uweigand@de.ibm.com>. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
dcf7800b | 10 | the Free Software Foundation; either version 3 of the License, or |
85e747d2 UW |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
dcf7800b | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
85e747d2 UW |
20 | |
21 | #include "defs.h" | |
22 | #include "gdbcore.h" | |
23 | #include "gdb_string.h" | |
24 | #include "gdb_assert.h" | |
25 | #include "gdb_stat.h" | |
26 | #include "arch-utils.h" | |
27 | #include "bfd.h" | |
28 | #include "symtab.h" | |
29 | #include "solib.h" | |
30 | #include "solib-svr4.h" | |
31 | #include "solist.h" | |
32 | #include "inferior.h" | |
33 | #include "objfiles.h" | |
34 | #include "observer.h" | |
35 | #include "breakpoint.h" | |
36 | #include "gdbthread.h" | |
37 | ||
38 | #include "spu-tdep.h" | |
39 | ||
40 | /* Highest SPE id (file handle) the inferior may have. */ | |
41 | #define MAX_SPE_FD 1024 | |
42 | ||
43 | /* Stand-alone SPE executable? */ | |
44 | #define spu_standalone_p() \ | |
45 | (symfile_objfile && symfile_objfile->obfd \ | |
46 | && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu) | |
47 | ||
48 | ||
49 | /* Relocate main SPE executable. */ | |
50 | static void | |
51 | spu_relocate_main_executable (int spufs_fd) | |
52 | { | |
85e747d2 UW |
53 | struct section_offsets *new_offsets; |
54 | int i; | |
55 | ||
567995e1 JK |
56 | if (symfile_objfile == NULL) |
57 | return; | |
85e747d2 | 58 | |
567995e1 JK |
59 | new_offsets = alloca (symfile_objfile->num_sections |
60 | * sizeof (struct section_offsets)); | |
85e747d2 | 61 | |
567995e1 JK |
62 | for (i = 0; i < symfile_objfile->num_sections; i++) |
63 | new_offsets->offsets[i] = SPUADDR (spufs_fd, 0); | |
64 | ||
65 | objfile_relocate (symfile_objfile, new_offsets); | |
85e747d2 UW |
66 | } |
67 | ||
68 | /* When running a stand-alone SPE executable, we may need to skip one more | |
69 | exec event on startup, to get past the binfmt_misc loader. */ | |
70 | static void | |
71 | spu_skip_standalone_loader (void) | |
72 | { | |
73 | if (target_has_execution && !current_inferior ()->attach_flag) | |
74 | { | |
75 | struct target_waitstatus ws; | |
76 | ||
77 | /* Only some kernels report an extra SIGTRAP with the binfmt_misc | |
78 | loader; others do not. In addition, if we have attached to an | |
79 | already running inferior instead of starting a new one, we will | |
80 | not see the extra SIGTRAP -- and we cannot readily distinguish | |
81 | the two cases, in particular with the extended-remote target. | |
82 | ||
83 | Thus we issue a single-step here. If no extra SIGTRAP was pending, | |
84 | this will step past the first instruction of the stand-alone SPE | |
85 | executable loader, but we don't care about that. */ | |
86 | ||
87 | inferior_thread ()->in_infcall = 1; /* Suppress MI messages. */ | |
88 | ||
89 | target_resume (inferior_ptid, 1, TARGET_SIGNAL_0); | |
90 | target_wait (minus_one_ptid, &ws, 0); | |
91 | set_executing (minus_one_ptid, 0); | |
92 | ||
93 | inferior_thread ()->in_infcall = 0; | |
94 | } | |
95 | } | |
96 | ||
97 | /* Build a list of `struct so_list' objects describing the shared | |
98 | objects currently loaded in the inferior. */ | |
99 | static struct so_list * | |
100 | spu_current_sos (void) | |
101 | { | |
102 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
103 | struct so_list *head; | |
104 | struct so_list **link_ptr; | |
105 | ||
106 | char buf[MAX_SPE_FD * 4]; | |
107 | int i, size; | |
108 | ||
109 | /* First, retrieve the SVR4 shared library list. */ | |
110 | head = svr4_so_ops.current_sos (); | |
111 | ||
112 | /* Append our libraries to the end of the list. */ | |
113 | for (link_ptr = &head; *link_ptr; link_ptr = &(*link_ptr)->next) | |
114 | ; | |
115 | ||
116 | /* Determine list of SPU ids. */ | |
117 | size = target_read (¤t_target, TARGET_OBJECT_SPU, NULL, | |
118 | buf, 0, sizeof buf); | |
119 | ||
120 | /* Do not add stand-alone SPE executable context as shared library, | |
121 | but relocate main SPE executable objfile. */ | |
122 | if (spu_standalone_p ()) | |
123 | { | |
124 | if (size == 4) | |
125 | { | |
126 | int fd = extract_unsigned_integer (buf, 4, byte_order); | |
127 | spu_relocate_main_executable (fd); | |
128 | ||
129 | /* Re-enable breakpoints after main SPU context was established; | |
130 | see also comments in spu_solib_create_inferior_hook. */ | |
131 | enable_breakpoints_after_startup (); | |
132 | } | |
133 | ||
134 | return head; | |
135 | } | |
136 | ||
137 | /* Create an so_list entry for each SPU id. */ | |
138 | for (i = 0; i < size; i += 4) | |
139 | { | |
140 | int fd = extract_unsigned_integer (buf + i, 4, byte_order); | |
141 | struct so_list *new; | |
142 | ||
143 | unsigned long long addr; | |
144 | char annex[32], id[100]; | |
145 | int len; | |
146 | ||
147 | /* Read object ID. There's a race window where the inferior may have | |
148 | already created the SPE context, but not installed the object-id | |
149 | yet. Skip such entries; we'll be back for them later. */ | |
150 | xsnprintf (annex, sizeof annex, "%d/object-id", fd); | |
151 | len = target_read (¤t_target, TARGET_OBJECT_SPU, annex, | |
152 | id, 0, sizeof id); | |
153 | if (len <= 0 || len >= sizeof id) | |
154 | continue; | |
155 | id[len] = 0; | |
156 | if (sscanf (id, "0x%llx", &addr) != 1 || !addr) | |
157 | continue; | |
158 | ||
159 | /* Allocate so_list structure. */ | |
160 | new = XZALLOC (struct so_list); | |
161 | ||
162 | /* Encode FD and object ID in path name. Choose the name so as not | |
163 | to conflict with any (normal) SVR4 library path name. */ | |
164 | xsnprintf (new->so_name, sizeof new->so_name, "@0x%llx <%d>", addr, fd); | |
165 | strcpy (new->so_original_name, new->so_name); | |
166 | ||
167 | *link_ptr = new; | |
168 | link_ptr = &new->next; | |
169 | } | |
170 | ||
171 | return head; | |
172 | } | |
173 | ||
174 | /* Free so_list information. */ | |
175 | static void | |
176 | spu_free_so (struct so_list *so) | |
177 | { | |
178 | if (so->so_original_name[0] != '@') | |
179 | svr4_so_ops.free_so (so); | |
180 | } | |
181 | ||
182 | /* Relocate section addresses. */ | |
183 | static void | |
184 | spu_relocate_section_addresses (struct so_list *so, | |
185 | struct target_section *sec) | |
186 | { | |
187 | if (so->so_original_name[0] != '@') | |
188 | svr4_so_ops.relocate_section_addresses (so, sec); | |
189 | else | |
190 | { | |
191 | unsigned long long addr; | |
192 | int fd; | |
193 | ||
194 | /* Set addr_low/high to just LS offset for display. */ | |
195 | if (so->addr_low == 0 && so->addr_high == 0 | |
196 | && strcmp (sec->the_bfd_section->name, ".text") == 0) | |
197 | { | |
198 | so->addr_low = sec->addr; | |
199 | so->addr_high = sec->endaddr; | |
200 | } | |
201 | ||
202 | /* Decode object ID. */ | |
203 | if (sscanf (so->so_original_name, "@0x%llx <%d>", &addr, &fd) != 2) | |
204 | internal_error (__FILE__, __LINE__, "bad object ID"); | |
205 | ||
206 | sec->addr = SPUADDR (fd, sec->addr); | |
207 | sec->endaddr = SPUADDR (fd, sec->endaddr); | |
208 | } | |
209 | } | |
210 | ||
211 | ||
212 | /* Inferior memory should contain an SPE executable image at location ADDR. | |
213 | Allocate a BFD representing that executable. Return NULL on error. */ | |
214 | ||
215 | static void * | |
216 | spu_bfd_iovec_open (bfd *nbfd, void *open_closure) | |
217 | { | |
218 | return open_closure; | |
219 | } | |
220 | ||
221 | static int | |
222 | spu_bfd_iovec_close (bfd *nbfd, void *stream) | |
223 | { | |
224 | xfree (stream); | |
225 | return 1; | |
226 | } | |
227 | ||
228 | static file_ptr | |
229 | spu_bfd_iovec_pread (bfd *abfd, void *stream, void *buf, | |
230 | file_ptr nbytes, file_ptr offset) | |
231 | { | |
232 | CORE_ADDR addr = *(CORE_ADDR *)stream; | |
233 | int ret; | |
234 | ||
235 | ret = target_read_memory (addr + offset, buf, nbytes); | |
236 | if (ret != 0) | |
237 | { | |
238 | bfd_set_error (bfd_error_invalid_operation); | |
239 | return -1; | |
240 | } | |
241 | ||
242 | return nbytes; | |
243 | } | |
244 | ||
245 | static int | |
246 | spu_bfd_iovec_stat (bfd *abfd, void *stream, struct stat *sb) | |
247 | { | |
248 | /* We don't have an easy way of finding the size of embedded spu | |
249 | images. We could parse the in-memory ELF header and section | |
250 | table to find the extent of the last section but that seems | |
251 | pointless when the size is needed only for checks of other | |
252 | parsed values in dbxread.c. */ | |
253 | sb->st_size = INT_MAX; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static bfd * | |
258 | spu_bfd_fopen (char *name, CORE_ADDR addr) | |
259 | { | |
260 | bfd *nbfd; | |
261 | ||
262 | CORE_ADDR *open_closure = xmalloc (sizeof (CORE_ADDR)); | |
263 | *open_closure = addr; | |
264 | ||
265 | nbfd = bfd_openr_iovec (xstrdup (name), "elf32-spu", | |
266 | spu_bfd_iovec_open, open_closure, | |
267 | spu_bfd_iovec_pread, spu_bfd_iovec_close, | |
268 | spu_bfd_iovec_stat); | |
269 | if (!nbfd) | |
270 | return NULL; | |
271 | ||
272 | if (!bfd_check_format (nbfd, bfd_object)) | |
273 | { | |
274 | bfd_close (nbfd); | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | return nbfd; | |
279 | } | |
280 | ||
281 | /* Open shared library BFD. */ | |
282 | static bfd * | |
283 | spu_bfd_open (char *pathname) | |
284 | { | |
285 | char *original_name = strrchr (pathname, '@'); | |
286 | bfd *abfd; | |
287 | asection *spu_name; | |
288 | unsigned long long addr; | |
289 | int fd; | |
290 | ||
291 | /* Handle regular SVR4 libraries. */ | |
292 | if (!original_name) | |
293 | return svr4_so_ops.bfd_open (pathname); | |
294 | ||
295 | /* Decode object ID. */ | |
296 | if (sscanf (original_name, "@0x%llx <%d>", &addr, &fd) != 2) | |
297 | internal_error (__FILE__, __LINE__, "bad object ID"); | |
298 | ||
299 | /* Open BFD representing SPE executable. */ | |
300 | abfd = spu_bfd_fopen (original_name, (CORE_ADDR) addr); | |
301 | if (!abfd) | |
302 | error (_("Cannot read SPE executable at %s"), original_name); | |
303 | ||
304 | /* Retrieve SPU name note. */ | |
305 | spu_name = bfd_get_section_by_name (abfd, ".note.spu_name"); | |
306 | if (spu_name) | |
307 | { | |
308 | int sect_size = bfd_section_size (abfd, spu_name); | |
309 | if (sect_size > 20) | |
310 | { | |
311 | char *buf = alloca (sect_size - 20 + strlen (original_name) + 1); | |
312 | bfd_get_section_contents (abfd, spu_name, buf, 20, sect_size - 20); | |
313 | buf[sect_size - 20] = '\0'; | |
314 | ||
315 | strcat (buf, original_name); | |
316 | ||
317 | xfree ((char *)abfd->filename); | |
318 | abfd->filename = xstrdup (buf); | |
319 | } | |
320 | } | |
321 | ||
322 | return abfd; | |
323 | } | |
324 | ||
325 | /* Lookup global symbol in a SPE executable. */ | |
326 | static struct symbol * | |
327 | spu_lookup_lib_symbol (const struct objfile *objfile, | |
328 | const char *name, | |
329 | const char *linkage_name, | |
330 | const domain_enum domain) | |
331 | { | |
332 | if (bfd_get_arch (objfile->obfd) == bfd_arch_spu) | |
333 | return lookup_global_symbol_from_objfile (objfile, name, linkage_name, | |
334 | domain); | |
335 | ||
336 | if (svr4_so_ops.lookup_lib_global_symbol != NULL) | |
337 | return svr4_so_ops.lookup_lib_global_symbol (objfile, name, linkage_name, | |
338 | domain); | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* Enable shared library breakpoint. */ | |
343 | static int | |
344 | spu_enable_break (struct objfile *objfile) | |
345 | { | |
346 | struct minimal_symbol *spe_event_sym = NULL; | |
347 | ||
348 | /* The libspe library will call __spe_context_update_event whenever any | |
349 | SPE context is allocated or destroyed. */ | |
350 | spe_event_sym = lookup_minimal_symbol ("__spe_context_update_event", | |
351 | NULL, objfile); | |
352 | ||
353 | /* Place a solib_event breakpoint on the symbol. */ | |
354 | if (spe_event_sym) | |
355 | { | |
356 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (spe_event_sym); | |
357 | addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, addr, | |
358 | ¤t_target); | |
359 | create_solib_event_breakpoint (target_gdbarch, addr); | |
360 | return 1; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | /* Create inferior hook. */ | |
367 | static void | |
268a4a75 | 368 | spu_solib_create_inferior_hook (int from_tty) |
85e747d2 | 369 | { |
85e747d2 UW |
370 | /* Handle SPE stand-alone executables. */ |
371 | if (spu_standalone_p ()) | |
372 | { | |
373 | /* After an SPE stand-alone executable was loaded, we'll receive | |
374 | an additional trap due to the binfmt_misc handler. Make sure | |
375 | to skip that trap. */ | |
376 | spu_skip_standalone_loader (); | |
377 | ||
378 | /* If the user established breakpoints before starting the inferior, GDB | |
379 | would attempt to insert those now. This would fail because the SPU | |
380 | context has not yet been created and the SPU executable has not yet | |
381 | been loaded. To prevent such failures, we disable all user-created | |
382 | breakpoints now; they will be re-enabled in spu_current_sos once the | |
383 | main SPU context has been detected. */ | |
384 | disable_breakpoints_before_startup (); | |
385 | ||
386 | /* A special case arises when re-starting an executable, because at | |
387 | this point it still resides at the relocated address range that was | |
388 | determined during its last execution. We need to undo the relocation | |
389 | so that that multi-architecture target recognizes the stand-alone | |
390 | initialization special case. */ | |
391 | spu_relocate_main_executable (-1); | |
392 | } | |
393 | ||
394 | /* Call SVR4 hook -- this will re-insert the SVR4 solib breakpoints. */ | |
268a4a75 | 395 | svr4_so_ops.solib_create_inferior_hook (from_tty); |
85e747d2 UW |
396 | |
397 | /* If the inferior is statically linked against libspe, we need to install | |
398 | our own solib breakpoint right now. Otherwise, it will be installed by | |
399 | the solib_loaded observer below as soon as libspe is loaded. */ | |
400 | spu_enable_break (NULL); | |
401 | } | |
402 | ||
403 | /* Install SPE "shared library" handling. This is called by -tdep code | |
404 | that wants to support SPU as a secondary architecture. */ | |
405 | void | |
406 | set_spu_solib_ops (struct gdbarch *gdbarch) | |
407 | { | |
408 | static struct target_so_ops spu_so_ops; | |
409 | ||
410 | /* Initialize this lazily, to avoid an initialization order | |
411 | dependency on solib-svr4.c's _initialize routine. */ | |
412 | if (spu_so_ops.current_sos == NULL) | |
413 | { | |
414 | spu_so_ops = svr4_so_ops; | |
415 | spu_so_ops.solib_create_inferior_hook = spu_solib_create_inferior_hook; | |
416 | spu_so_ops.relocate_section_addresses = spu_relocate_section_addresses; | |
417 | spu_so_ops.free_so = spu_free_so; | |
418 | spu_so_ops.current_sos = spu_current_sos; | |
419 | spu_so_ops.bfd_open = spu_bfd_open; | |
420 | spu_so_ops.lookup_lib_global_symbol = spu_lookup_lib_symbol; | |
421 | } | |
422 | ||
423 | set_solib_ops (gdbarch, &spu_so_ops); | |
424 | } | |
425 | ||
426 | /* Observer for the solib_loaded event. Used to install our breakpoint | |
427 | if libspe is a shared library. */ | |
428 | static void | |
429 | spu_solib_loaded (struct so_list *so) | |
430 | { | |
431 | if (strstr (so->so_original_name, "/libspe") != NULL) | |
432 | { | |
433 | solib_read_symbols (so, so->from_tty ? SYMFILE_VERBOSE : 0); | |
434 | spu_enable_break (so->objfile); | |
435 | } | |
436 | } | |
437 | ||
438 | void | |
439 | _initialize_spu_solib (void) | |
440 | { | |
441 | observer_attach_solib_loaded (spu_solib_loaded); | |
442 | } | |
443 |