| 1 | /* Handle SOM shared libraries. |
| 2 | |
| 3 | Copyright (C) 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | #include "bfd.h" |
| 23 | #include "symfile.h" |
| 24 | #include "objfiles.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "target.h" |
| 27 | #include "inferior.h" |
| 28 | |
| 29 | #include "hppa-tdep.h" |
| 30 | #include "solist.h" |
| 31 | #include "solib.h" |
| 32 | #include "solib-som.h" |
| 33 | |
| 34 | #include <sys/utsname.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #undef SOLIB_SOM_DBG |
| 38 | |
| 39 | /* These ought to be defined in some public interface, but aren't. They |
| 40 | define the meaning of the various bits in the distinguished __dld_flags |
| 41 | variable that is declared in every debuggable a.out on HP-UX, and that |
| 42 | is shared between the debugger and the dynamic linker. |
| 43 | */ |
| 44 | #define DLD_FLAGS_MAPPRIVATE 0x1 |
| 45 | #define DLD_FLAGS_HOOKVALID 0x2 |
| 46 | #define DLD_FLAGS_LISTVALID 0x4 |
| 47 | #define DLD_FLAGS_BOR_ENABLE 0x8 |
| 48 | |
| 49 | struct lm_info |
| 50 | { |
| 51 | /* Version of this structure (it is expected to change again in hpux10). */ |
| 52 | unsigned char struct_version; |
| 53 | |
| 54 | /* Binding mode for this library. */ |
| 55 | unsigned char bind_mode; |
| 56 | |
| 57 | /* Version of this library. */ |
| 58 | short library_version; |
| 59 | |
| 60 | /* Start of text address, |
| 61 | link-time text location (length of text area), |
| 62 | end of text address. */ |
| 63 | CORE_ADDR text_addr; |
| 64 | CORE_ADDR text_link_addr; |
| 65 | CORE_ADDR text_end; |
| 66 | |
| 67 | /* Start of data, start of bss and end of data. */ |
| 68 | CORE_ADDR data_start; |
| 69 | CORE_ADDR bss_start; |
| 70 | CORE_ADDR data_end; |
| 71 | |
| 72 | /* Value of linkage pointer (%r19). */ |
| 73 | CORE_ADDR got_value; |
| 74 | |
| 75 | /* Address in target of offset from thread-local register of |
| 76 | start of this thread's data. I.e., the first thread-local |
| 77 | variable in this shared library starts at *(tsd_start_addr) |
| 78 | from that area pointed to by cr27 (mpsfu_hi). |
| 79 | |
| 80 | We do the indirection as soon as we read it, so from then |
| 81 | on it's the offset itself. */ |
| 82 | CORE_ADDR tsd_start_addr; |
| 83 | |
| 84 | /* Address of the link map entry in the loader. */ |
| 85 | CORE_ADDR lm_addr; |
| 86 | }; |
| 87 | |
| 88 | /* These addresses should be filled in by som_solib_create_inferior_hook. |
| 89 | They are also used elsewhere in this module. |
| 90 | */ |
| 91 | typedef struct |
| 92 | { |
| 93 | CORE_ADDR address; |
| 94 | struct unwind_table_entry *unwind; |
| 95 | } |
| 96 | addr_and_unwind_t; |
| 97 | |
| 98 | /* When adding fields, be sure to clear them in _initialize_som_solib. */ |
| 99 | static struct |
| 100 | { |
| 101 | int is_valid; |
| 102 | addr_and_unwind_t hook; |
| 103 | addr_and_unwind_t hook_stub; |
| 104 | addr_and_unwind_t load; |
| 105 | addr_and_unwind_t load_stub; |
| 106 | addr_and_unwind_t unload; |
| 107 | addr_and_unwind_t unload2; |
| 108 | addr_and_unwind_t unload_stub; |
| 109 | } |
| 110 | dld_cache; |
| 111 | |
| 112 | static void |
| 113 | som_relocate_section_addresses (struct so_list *so, |
| 114 | struct target_section *sec) |
| 115 | { |
| 116 | flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section); |
| 117 | |
| 118 | if (aflag & SEC_CODE) |
| 119 | { |
| 120 | sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr; |
| 121 | sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr; |
| 122 | } |
| 123 | else if (aflag & SEC_DATA) |
| 124 | { |
| 125 | sec->addr += so->lm_info->data_start; |
| 126 | sec->endaddr += so->lm_info->data_start; |
| 127 | } |
| 128 | else |
| 129 | ; |
| 130 | } |
| 131 | |
| 132 | /* Get HP-UX major release number. Returns zero if the |
| 133 | release is not known. */ |
| 134 | |
| 135 | static int |
| 136 | get_hpux_major_release (void) |
| 137 | { |
| 138 | static int hpux_major_release = -1; |
| 139 | |
| 140 | if (hpux_major_release == -1) |
| 141 | { |
| 142 | struct utsname x; |
| 143 | char *p; |
| 144 | |
| 145 | uname (&x); |
| 146 | p = strchr (x.release, '.'); |
| 147 | hpux_major_release = p ? atoi (p + 1) : 0; |
| 148 | } |
| 149 | |
| 150 | return hpux_major_release; |
| 151 | } |
| 152 | |
| 153 | /* DL header flag defines. */ |
| 154 | #define SHLIB_TEXT_PRIVATE_ENABLE 0x4000 |
| 155 | |
| 156 | /* The DL header is documented in <shl.h>. We are only interested |
| 157 | in the flags field to determine whether the executable wants shared |
| 158 | libraries mapped private. */ |
| 159 | struct { |
| 160 | short junk[37]; |
| 161 | short flags; |
| 162 | } dl_header; |
| 163 | |
| 164 | /* This hook gets called just before the first instruction in the |
| 165 | inferior process is executed. |
| 166 | |
| 167 | This is our opportunity to set magic flags in the inferior so |
| 168 | that GDB can be notified when a shared library is mapped in and |
| 169 | to tell the dynamic linker that a private copy of the library is |
| 170 | needed (so GDB can set breakpoints in the library). |
| 171 | |
| 172 | __dld_flags is the location of the magic flags; as of this implementation |
| 173 | there are 3 flags of interest: |
| 174 | |
| 175 | bit 0 when set indicates that private copies of the libraries are needed |
| 176 | bit 1 when set indicates that the callback hook routine is valid |
| 177 | bit 2 when set indicates that the dynamic linker should maintain the |
| 178 | __dld_list structure when loading/unloading libraries. |
| 179 | |
| 180 | Note that shared libraries are not mapped in at this time, so we have |
| 181 | run the inferior until the libraries are mapped in. Typically this |
| 182 | means running until the "_start" is called. */ |
| 183 | |
| 184 | static void |
| 185 | som_solib_create_inferior_hook (void) |
| 186 | { |
| 187 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 188 | struct minimal_symbol *msymbol; |
| 189 | unsigned int dld_flags, status, have_endo; |
| 190 | asection *shlib_info; |
| 191 | char buf[4]; |
| 192 | CORE_ADDR anaddr; |
| 193 | |
| 194 | /* First, remove all the solib event breakpoints. Their addresses |
| 195 | may have changed since the last time we ran the program. */ |
| 196 | remove_solib_event_breakpoints (); |
| 197 | |
| 198 | if (symfile_objfile == NULL) |
| 199 | return; |
| 200 | |
| 201 | /* First see if the objfile was dynamically linked. */ |
| 202 | shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); |
| 203 | if (!shlib_info) |
| 204 | return; |
| 205 | |
| 206 | /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ |
| 207 | if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) |
| 208 | return; |
| 209 | |
| 210 | /* Read the DL header. */ |
| 211 | bfd_get_section_contents (symfile_objfile->obfd, shlib_info, |
| 212 | (char *) &dl_header, 0, sizeof (dl_header)); |
| 213 | |
| 214 | have_endo = 0; |
| 215 | /* Slam the pid of the process into __d_pid. |
| 216 | |
| 217 | We used to warn when this failed, but that warning is only useful |
| 218 | on very old HP systems (hpux9 and older). The warnings are an |
| 219 | annoyance to users of modern systems and foul up the testsuite as |
| 220 | well. As a result, the warnings have been disabled. */ |
| 221 | msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); |
| 222 | if (msymbol == NULL) |
| 223 | goto keep_going; |
| 224 | |
| 225 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 226 | store_unsigned_integer (buf, 4, byte_order, PIDGET (inferior_ptid)); |
| 227 | status = target_write_memory (anaddr, buf, 4); |
| 228 | if (status != 0) |
| 229 | { |
| 230 | warning (_("\ |
| 231 | Unable to write __d_pid.\n\ |
| 232 | Suggest linking with /opt/langtools/lib/end.o.\n\ |
| 233 | GDB will be unable to track shl_load/shl_unload calls")); |
| 234 | goto keep_going; |
| 235 | } |
| 236 | |
| 237 | /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; |
| 238 | This will force the dynamic linker to call __d_trap when significant |
| 239 | events occur. |
| 240 | |
| 241 | Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above, |
| 242 | the dld provides an export stub named "__d_trap" as well as the |
| 243 | function named "__d_trap" itself, but doesn't provide "_DLD_HOOK". |
| 244 | We'll look first for the old flavor and then the new. |
| 245 | */ |
| 246 | msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); |
| 247 | if (msymbol == NULL) |
| 248 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); |
| 249 | if (msymbol == NULL) |
| 250 | { |
| 251 | warning (_("\ |
| 252 | Unable to find _DLD_HOOK symbol in object file.\n\ |
| 253 | Suggest linking with /opt/langtools/lib/end.o.\n\ |
| 254 | GDB will be unable to track shl_load/shl_unload calls")); |
| 255 | goto keep_going; |
| 256 | } |
| 257 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 258 | dld_cache.hook.address = anaddr; |
| 259 | |
| 260 | /* Grrr, this might not be an export symbol! We have to find the |
| 261 | export stub. */ |
| 262 | msymbol = hppa_lookup_stub_minimal_symbol (SYMBOL_LINKAGE_NAME (msymbol), |
| 263 | EXPORT); |
| 264 | if (msymbol != NULL) |
| 265 | { |
| 266 | anaddr = SYMBOL_VALUE (msymbol); |
| 267 | dld_cache.hook_stub.address = anaddr; |
| 268 | } |
| 269 | store_unsigned_integer (buf, 4, byte_order, anaddr); |
| 270 | |
| 271 | msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); |
| 272 | if (msymbol == NULL) |
| 273 | { |
| 274 | warning (_("\ |
| 275 | Unable to find __dld_hook symbol in object file.\n\ |
| 276 | Suggest linking with /opt/langtools/lib/end.o.\n\ |
| 277 | GDB will be unable to track shl_load/shl_unload calls")); |
| 278 | goto keep_going; |
| 279 | } |
| 280 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 281 | status = target_write_memory (anaddr, buf, 4); |
| 282 | |
| 283 | /* Now set a shlib_event breakpoint at __d_trap so we can track |
| 284 | significant shared library events. */ |
| 285 | msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); |
| 286 | if (msymbol == NULL) |
| 287 | { |
| 288 | warning (_("\ |
| 289 | Unable to find __dld_d_trap symbol in object file.\n\ |
| 290 | Suggest linking with /opt/langtools/lib/end.o.\n\ |
| 291 | GDB will be unable to track shl_load/shl_unload calls")); |
| 292 | goto keep_going; |
| 293 | } |
| 294 | create_solib_event_breakpoint (target_gdbarch, |
| 295 | SYMBOL_VALUE_ADDRESS (msymbol)); |
| 296 | |
| 297 | /* We have all the support usually found in end.o, so we can track |
| 298 | shl_load and shl_unload calls. */ |
| 299 | have_endo = 1; |
| 300 | |
| 301 | keep_going: |
| 302 | |
| 303 | /* Get the address of __dld_flags, if no such symbol exists, then we can |
| 304 | not debug the shared code. */ |
| 305 | msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 306 | if (msymbol == NULL) |
| 307 | { |
| 308 | error (_("Unable to find __dld_flags symbol in object file.")); |
| 309 | } |
| 310 | |
| 311 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 312 | |
| 313 | /* Read the current contents. */ |
| 314 | status = target_read_memory (anaddr, buf, 4); |
| 315 | if (status != 0) |
| 316 | error (_("Unable to read __dld_flags.")); |
| 317 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
| 318 | |
| 319 | /* If the libraries were not mapped private on HP-UX 11 and later, warn |
| 320 | the user. On HP-UX 10 and earlier, there is no easy way to specify |
| 321 | that shared libraries should be privately mapped. So, we just force |
| 322 | private mapping. */ |
| 323 | if (get_hpux_major_release () >= 11 |
| 324 | && (dl_header.flags & SHLIB_TEXT_PRIVATE_ENABLE) == 0 |
| 325 | && (dld_flags & DLD_FLAGS_MAPPRIVATE) == 0) |
| 326 | warning |
| 327 | (_("Private mapping of shared library text was not specified\n" |
| 328 | "by the executable; setting a breakpoint in a shared library which\n" |
| 329 | "is not privately mapped will not work. See the HP-UX 11i v3 chatr\n" |
| 330 | "manpage for methods to privately map shared library text.")); |
| 331 | |
| 332 | /* Turn on the flags we care about. */ |
| 333 | if (get_hpux_major_release () < 11) |
| 334 | dld_flags |= DLD_FLAGS_MAPPRIVATE; |
| 335 | if (have_endo) |
| 336 | dld_flags |= DLD_FLAGS_HOOKVALID; |
| 337 | store_unsigned_integer (buf, 4, byte_order, dld_flags); |
| 338 | status = target_write_memory (anaddr, buf, 4); |
| 339 | if (status != 0) |
| 340 | error (_("Unable to write __dld_flags.")); |
| 341 | |
| 342 | /* Now find the address of _start and set a breakpoint there. |
| 343 | We still need this code for two reasons: |
| 344 | |
| 345 | * Not all sites have /opt/langtools/lib/end.o, so it's not always |
| 346 | possible to track the dynamic linker's events. |
| 347 | |
| 348 | * At this time no events are triggered for shared libraries |
| 349 | loaded at startup time (what a crock). */ |
| 350 | |
| 351 | msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); |
| 352 | if (msymbol == NULL) |
| 353 | error (_("Unable to find _start symbol in object file.")); |
| 354 | |
| 355 | anaddr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 356 | |
| 357 | /* Make the breakpoint at "_start" a shared library event breakpoint. */ |
| 358 | create_solib_event_breakpoint (target_gdbarch, anaddr); |
| 359 | |
| 360 | clear_symtab_users (); |
| 361 | } |
| 362 | |
| 363 | static void |
| 364 | som_special_symbol_handling (void) |
| 365 | { |
| 366 | } |
| 367 | |
| 368 | static void |
| 369 | som_solib_desire_dynamic_linker_symbols (void) |
| 370 | { |
| 371 | struct objfile *objfile; |
| 372 | struct unwind_table_entry *u; |
| 373 | struct minimal_symbol *dld_msymbol; |
| 374 | |
| 375 | /* Do we already know the value of these symbols? If so, then |
| 376 | we've no work to do. |
| 377 | |
| 378 | (If you add clauses to this test, be sure to likewise update the |
| 379 | test within the loop.) |
| 380 | */ |
| 381 | if (dld_cache.is_valid) |
| 382 | return; |
| 383 | |
| 384 | ALL_OBJFILES (objfile) |
| 385 | { |
| 386 | dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile); |
| 387 | if (dld_msymbol != NULL) |
| 388 | { |
| 389 | dld_cache.load.address = SYMBOL_VALUE (dld_msymbol); |
| 390 | dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address); |
| 391 | } |
| 392 | |
| 393 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load", |
| 394 | objfile); |
| 395 | if (dld_msymbol != NULL) |
| 396 | { |
| 397 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
| 398 | { |
| 399 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); |
| 400 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) |
| 401 | { |
| 402 | dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol); |
| 403 | dld_cache.load_stub.unwind = u; |
| 404 | } |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile); |
| 409 | if (dld_msymbol != NULL) |
| 410 | { |
| 411 | dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol); |
| 412 | dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address); |
| 413 | |
| 414 | /* ??rehrauer: I'm not sure exactly what this is, but it appears |
| 415 | that on some HPUX 10.x versions, there's two unwind regions to |
| 416 | cover the body of "shl_unload", the second being 4 bytes past |
| 417 | the end of the first. This is a large hack to handle that |
| 418 | case, but since I don't seem to have any legitimate way to |
| 419 | look for this thing via the symbol table... |
| 420 | */ |
| 421 | if (dld_cache.unload.unwind != NULL) |
| 422 | { |
| 423 | u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4); |
| 424 | if (u != NULL) |
| 425 | { |
| 426 | dld_cache.unload2.address = u->region_start; |
| 427 | dld_cache.unload2.unwind = u; |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload", |
| 433 | objfile); |
| 434 | if (dld_msymbol != NULL) |
| 435 | { |
| 436 | if (MSYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) |
| 437 | { |
| 438 | u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); |
| 439 | if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) |
| 440 | { |
| 441 | dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol); |
| 442 | dld_cache.unload_stub.unwind = u; |
| 443 | } |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | /* Did we find everything we were looking for? If so, stop. */ |
| 448 | if ((dld_cache.load.address != 0) |
| 449 | && (dld_cache.load_stub.address != 0) |
| 450 | && (dld_cache.unload.address != 0) |
| 451 | && (dld_cache.unload_stub.address != 0)) |
| 452 | { |
| 453 | dld_cache.is_valid = 1; |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address); |
| 459 | dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address); |
| 460 | |
| 461 | /* We're prepared not to find some of these symbols, which is why |
| 462 | this function is a "desire" operation, and not a "require". |
| 463 | */ |
| 464 | } |
| 465 | |
| 466 | static int |
| 467 | som_in_dynsym_resolve_code (CORE_ADDR pc) |
| 468 | { |
| 469 | struct unwind_table_entry *u_pc; |
| 470 | |
| 471 | /* Are we in the dld itself? |
| 472 | |
| 473 | ??rehrauer: Large hack -- We'll assume that any address in a |
| 474 | shared text region is the dld's text. This would obviously |
| 475 | fall down if the user attached to a process, whose shlibs |
| 476 | weren't mapped to a (writeable) private region. However, in |
| 477 | that case the debugger probably isn't able to set the fundamental |
| 478 | breakpoint in the dld callback anyways, so this hack should be |
| 479 | safe. |
| 480 | */ |
| 481 | if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000) |
| 482 | return 1; |
| 483 | |
| 484 | /* Cache the address of some symbols that are part of the dynamic |
| 485 | linker, if not already known. |
| 486 | */ |
| 487 | som_solib_desire_dynamic_linker_symbols (); |
| 488 | |
| 489 | /* Are we in the dld callback? Or its export stub? */ |
| 490 | u_pc = find_unwind_entry (pc); |
| 491 | if (u_pc == NULL) |
| 492 | return 0; |
| 493 | |
| 494 | if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind)) |
| 495 | return 1; |
| 496 | |
| 497 | /* Or the interface of the dld (i.e., "shl_load" or friends)? */ |
| 498 | if ((u_pc == dld_cache.load.unwind) |
| 499 | || (u_pc == dld_cache.unload.unwind) |
| 500 | || (u_pc == dld_cache.unload2.unwind) |
| 501 | || (u_pc == dld_cache.load_stub.unwind) |
| 502 | || (u_pc == dld_cache.unload_stub.unwind)) |
| 503 | return 1; |
| 504 | |
| 505 | /* Apparently this address isn't part of the dld's text. */ |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | static void |
| 510 | som_clear_solib (void) |
| 511 | { |
| 512 | } |
| 513 | |
| 514 | struct dld_list { |
| 515 | char name[4]; |
| 516 | char info[4]; |
| 517 | char text_addr[4]; |
| 518 | char text_link_addr[4]; |
| 519 | char text_end[4]; |
| 520 | char data_start[4]; |
| 521 | char bss_start[4]; |
| 522 | char data_end[4]; |
| 523 | char got_value[4]; |
| 524 | char next[4]; |
| 525 | char tsd_start_addr_ptr[4]; |
| 526 | }; |
| 527 | |
| 528 | static CORE_ADDR |
| 529 | link_map_start (void) |
| 530 | { |
| 531 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 532 | struct minimal_symbol *sym; |
| 533 | CORE_ADDR addr; |
| 534 | char buf[4]; |
| 535 | unsigned int dld_flags; |
| 536 | |
| 537 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 538 | if (!sym) |
| 539 | error (_("Unable to find __dld_flags symbol in object file.")); |
| 540 | addr = SYMBOL_VALUE_ADDRESS (sym); |
| 541 | read_memory (addr, buf, 4); |
| 542 | dld_flags = extract_unsigned_integer (buf, 4, byte_order); |
| 543 | if ((dld_flags & DLD_FLAGS_LISTVALID) == 0) |
| 544 | error (_("__dld_list is not valid according to __dld_flags.")); |
| 545 | |
| 546 | sym = lookup_minimal_symbol ("__dld_list", NULL, NULL); |
| 547 | if (!sym) |
| 548 | { |
| 549 | /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, |
| 550 | but the data is still available if you know where to look. */ |
| 551 | sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); |
| 552 | if (!sym) |
| 553 | { |
| 554 | error (_("Unable to find dynamic library list.")); |
| 555 | return 0; |
| 556 | } |
| 557 | addr = SYMBOL_VALUE_ADDRESS (sym) - 8; |
| 558 | } |
| 559 | else |
| 560 | addr = SYMBOL_VALUE_ADDRESS (sym); |
| 561 | |
| 562 | read_memory (addr, buf, 4); |
| 563 | addr = extract_unsigned_integer (buf, 4, byte_order); |
| 564 | if (addr == 0) |
| 565 | return 0; |
| 566 | |
| 567 | read_memory (addr, buf, 4); |
| 568 | return extract_unsigned_integer (buf, 4, byte_order); |
| 569 | } |
| 570 | |
| 571 | /* Does this so's name match the main binary? */ |
| 572 | static int |
| 573 | match_main (const char *name) |
| 574 | { |
| 575 | return strcmp (name, symfile_objfile->name) == 0; |
| 576 | } |
| 577 | |
| 578 | static struct so_list * |
| 579 | som_current_sos (void) |
| 580 | { |
| 581 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 582 | CORE_ADDR lm; |
| 583 | struct so_list *head = 0; |
| 584 | struct so_list **link_ptr = &head; |
| 585 | |
| 586 | for (lm = link_map_start (); lm; ) |
| 587 | { |
| 588 | char *namebuf; |
| 589 | CORE_ADDR addr; |
| 590 | struct so_list *new; |
| 591 | struct cleanup *old_chain; |
| 592 | int errcode; |
| 593 | struct dld_list dbuf; |
| 594 | char tsdbuf[4]; |
| 595 | |
| 596 | new = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 597 | old_chain = make_cleanup (xfree, new); |
| 598 | |
| 599 | memset (new, 0, sizeof (*new)); |
| 600 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
| 601 | make_cleanup (xfree, new->lm_info); |
| 602 | |
| 603 | read_memory (lm, (gdb_byte *)&dbuf, sizeof (struct dld_list)); |
| 604 | |
| 605 | addr = extract_unsigned_integer ((gdb_byte *)&dbuf.name, |
| 606 | sizeof (dbuf.name), byte_order); |
| 607 | target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
| 608 | if (errcode != 0) |
| 609 | warning (_("Can't read pathname for load map: %s."), |
| 610 | safe_strerror (errcode)); |
| 611 | else |
| 612 | { |
| 613 | strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1); |
| 614 | new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| 615 | xfree (namebuf); |
| 616 | strcpy (new->so_original_name, new->so_name); |
| 617 | } |
| 618 | |
| 619 | if (new->so_name[0] && !match_main (new->so_name)) |
| 620 | { |
| 621 | struct lm_info *lmi = new->lm_info; |
| 622 | unsigned int tmp; |
| 623 | |
| 624 | lmi->lm_addr = lm; |
| 625 | |
| 626 | #define EXTRACT(_fld) \ |
| 627 | extract_unsigned_integer ((gdb_byte *)&dbuf._fld, \ |
| 628 | sizeof (dbuf._fld), byte_order); |
| 629 | |
| 630 | lmi->text_addr = EXTRACT (text_addr); |
| 631 | tmp = EXTRACT (info); |
| 632 | lmi->library_version = (tmp >> 16) & 0xffff; |
| 633 | lmi->bind_mode = (tmp >> 8) & 0xff; |
| 634 | lmi->struct_version = tmp & 0xff; |
| 635 | lmi->text_link_addr = EXTRACT (text_link_addr); |
| 636 | lmi->text_end = EXTRACT (text_end); |
| 637 | lmi->data_start = EXTRACT (data_start); |
| 638 | lmi->bss_start = EXTRACT (bss_start); |
| 639 | lmi->data_end = EXTRACT (data_end); |
| 640 | lmi->got_value = EXTRACT (got_value); |
| 641 | tmp = EXTRACT (tsd_start_addr_ptr); |
| 642 | read_memory (tmp, tsdbuf, 4); |
| 643 | lmi->tsd_start_addr |
| 644 | = extract_unsigned_integer (tsdbuf, 4, byte_order); |
| 645 | |
| 646 | #ifdef SOLIB_SOM_DBG |
| 647 | printf ("\n+ library \"%s\" is described at %s\n", new->so_name, |
| 648 | paddress (target_gdbarch, lm)); |
| 649 | printf (" 'version' is %d\n", new->lm_info->struct_version); |
| 650 | printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode); |
| 651 | printf (" 'library_version' is %d\n", |
| 652 | new->lm_info->library_version); |
| 653 | printf (" 'text_addr' is %s\n", |
| 654 | paddress (target_gdbarch, new->lm_info->text_addr)); |
| 655 | printf (" 'text_link_addr' is %s\n", |
| 656 | paddress (target_gdbarch, new->lm_info->text_link_addr)); |
| 657 | printf (" 'text_end' is %s\n", |
| 658 | paddress (target_gdbarch, new->lm_info->text_end)); |
| 659 | printf (" 'data_start' is %s\n", |
| 660 | paddress (target_gdbarch, new->lm_info->data_start)); |
| 661 | printf (" 'bss_start' is %s\n", |
| 662 | paddress (target_gdbarch, new->lm_info->bss_start)); |
| 663 | printf (" 'data_end' is %s\n", |
| 664 | paddress (target_gdbarch, new->lm_info->data_end)); |
| 665 | printf (" 'got_value' is %s\n", |
| 666 | paddress (target_gdbarch, new->lm_info->got_value)); |
| 667 | printf (" 'tsd_start_addr' is %s\n", |
| 668 | paddress (target_gdbarch, new->lm_info->tsd_start_addr)); |
| 669 | #endif |
| 670 | |
| 671 | new->addr_low = lmi->text_addr; |
| 672 | new->addr_high = lmi->text_end; |
| 673 | |
| 674 | /* Link the new object onto the list. */ |
| 675 | new->next = NULL; |
| 676 | *link_ptr = new; |
| 677 | link_ptr = &new->next; |
| 678 | } |
| 679 | else |
| 680 | { |
| 681 | free_so (new); |
| 682 | } |
| 683 | |
| 684 | lm = EXTRACT (next); |
| 685 | discard_cleanups (old_chain); |
| 686 | #undef EXTRACT |
| 687 | } |
| 688 | |
| 689 | /* TODO: The original somsolib code has logic to detect and eliminate |
| 690 | duplicate entries. Do we need that? */ |
| 691 | |
| 692 | return head; |
| 693 | } |
| 694 | |
| 695 | static int |
| 696 | som_open_symbol_file_object (void *from_ttyp) |
| 697 | { |
| 698 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 699 | CORE_ADDR lm, l_name; |
| 700 | char *filename; |
| 701 | int errcode; |
| 702 | int from_tty = *(int *)from_ttyp; |
| 703 | char buf[4]; |
| 704 | |
| 705 | if (symfile_objfile) |
| 706 | if (!query (_("Attempt to reload symbols from process? "))) |
| 707 | return 0; |
| 708 | |
| 709 | /* First link map member should be the executable. */ |
| 710 | if ((lm = link_map_start ()) == 0) |
| 711 | return 0; /* failed somehow... */ |
| 712 | |
| 713 | /* Read address of name from target memory to GDB. */ |
| 714 | read_memory (lm + offsetof (struct dld_list, name), buf, 4); |
| 715 | |
| 716 | /* Convert the address to host format. Assume that the address is |
| 717 | unsigned. */ |
| 718 | l_name = extract_unsigned_integer (buf, 4, byte_order); |
| 719 | |
| 720 | if (l_name == 0) |
| 721 | return 0; /* No filename. */ |
| 722 | |
| 723 | /* Now fetch the filename from target memory. */ |
| 724 | target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); |
| 725 | |
| 726 | if (errcode) |
| 727 | { |
| 728 | warning (_("failed to read exec filename from attached file: %s"), |
| 729 | safe_strerror (errcode)); |
| 730 | return 0; |
| 731 | } |
| 732 | |
| 733 | make_cleanup (xfree, filename); |
| 734 | /* Have a pathname: read the symbol file. */ |
| 735 | symbol_file_add_main (filename, from_tty); |
| 736 | |
| 737 | return 1; |
| 738 | } |
| 739 | |
| 740 | static void |
| 741 | som_free_so (struct so_list *so) |
| 742 | { |
| 743 | xfree (so->lm_info); |
| 744 | } |
| 745 | |
| 746 | static CORE_ADDR |
| 747 | som_solib_thread_start_addr (struct so_list *so) |
| 748 | { |
| 749 | return so->lm_info->tsd_start_addr; |
| 750 | } |
| 751 | |
| 752 | /* Return the GOT value for the shared library in which ADDR belongs. If |
| 753 | ADDR isn't in any known shared library, return zero. */ |
| 754 | |
| 755 | static CORE_ADDR |
| 756 | som_solib_get_got_by_pc (CORE_ADDR addr) |
| 757 | { |
| 758 | struct so_list *so_list = master_so_list (); |
| 759 | CORE_ADDR got_value = 0; |
| 760 | |
| 761 | while (so_list) |
| 762 | { |
| 763 | if (so_list->lm_info->text_addr <= addr |
| 764 | && so_list->lm_info->text_end > addr) |
| 765 | { |
| 766 | got_value = so_list->lm_info->got_value; |
| 767 | break; |
| 768 | } |
| 769 | so_list = so_list->next; |
| 770 | } |
| 771 | return got_value; |
| 772 | } |
| 773 | |
| 774 | /* Return the address of the handle of the shared library in which ADDR belongs. |
| 775 | If ADDR isn't in any known shared library, return zero. */ |
| 776 | /* this function is used in initialize_hp_cxx_exception_support in |
| 777 | hppa-hpux-tdep.c */ |
| 778 | |
| 779 | static CORE_ADDR |
| 780 | som_solib_get_solib_by_pc (CORE_ADDR addr) |
| 781 | { |
| 782 | struct so_list *so_list = master_so_list (); |
| 783 | |
| 784 | while (so_list) |
| 785 | { |
| 786 | if (so_list->lm_info->text_addr <= addr |
| 787 | && so_list->lm_info->text_end > addr) |
| 788 | { |
| 789 | break; |
| 790 | } |
| 791 | so_list = so_list->next; |
| 792 | } |
| 793 | if (so_list) |
| 794 | return so_list->lm_info->lm_addr; |
| 795 | else |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | |
| 800 | static struct target_so_ops som_so_ops; |
| 801 | |
| 802 | extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */ |
| 803 | |
| 804 | void |
| 805 | _initialize_som_solib (void) |
| 806 | { |
| 807 | som_so_ops.relocate_section_addresses = som_relocate_section_addresses; |
| 808 | som_so_ops.free_so = som_free_so; |
| 809 | som_so_ops.clear_solib = som_clear_solib; |
| 810 | som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook; |
| 811 | som_so_ops.special_symbol_handling = som_special_symbol_handling; |
| 812 | som_so_ops.current_sos = som_current_sos; |
| 813 | som_so_ops.open_symbol_file_object = som_open_symbol_file_object; |
| 814 | som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code; |
| 815 | som_so_ops.bfd_open = solib_bfd_open; |
| 816 | } |
| 817 | |
| 818 | void |
| 819 | som_solib_select (struct gdbarch *gdbarch) |
| 820 | { |
| 821 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 822 | set_solib_ops (gdbarch, &som_so_ops); |
| 823 | |
| 824 | tdep->solib_thread_start_addr = som_solib_thread_start_addr; |
| 825 | tdep->solib_get_got_by_pc = som_solib_get_got_by_pc; |
| 826 | tdep->solib_get_solib_by_pc = som_solib_get_solib_by_pc; |
| 827 | } |
| 828 | |
| 829 | /* The rest of these functions are not part of the solib interface; they |
| 830 | are used by somread.c or hppa-hpux-tdep.c */ |
| 831 | |
| 832 | int |
| 833 | som_solib_section_offsets (struct objfile *objfile, |
| 834 | struct section_offsets *offsets) |
| 835 | { |
| 836 | struct so_list *so_list = master_so_list (); |
| 837 | |
| 838 | while (so_list) |
| 839 | { |
| 840 | /* Oh what a pain! We need the offsets before so_list->objfile |
| 841 | is valid. The BFDs will never match. Make a best guess. */ |
| 842 | if (strstr (objfile->name, so_list->so_name)) |
| 843 | { |
| 844 | asection *private_section; |
| 845 | |
| 846 | /* The text offset is easy. */ |
| 847 | offsets->offsets[SECT_OFF_TEXT (objfile)] |
| 848 | = (so_list->lm_info->text_addr |
| 849 | - so_list->lm_info->text_link_addr); |
| 850 | offsets->offsets[SECT_OFF_RODATA (objfile)] |
| 851 | = ANOFFSET (offsets, SECT_OFF_TEXT (objfile)); |
| 852 | |
| 853 | /* We should look at presumed_dp in the SOM header, but |
| 854 | that's not easily available. This should be OK though. */ |
| 855 | private_section = bfd_get_section_by_name (objfile->obfd, |
| 856 | "$PRIVATE$"); |
| 857 | if (!private_section) |
| 858 | { |
| 859 | warning (_("Unable to find $PRIVATE$ in shared library!")); |
| 860 | offsets->offsets[SECT_OFF_DATA (objfile)] = 0; |
| 861 | offsets->offsets[SECT_OFF_BSS (objfile)] = 0; |
| 862 | return 1; |
| 863 | } |
| 864 | offsets->offsets[SECT_OFF_DATA (objfile)] |
| 865 | = (so_list->lm_info->data_start - private_section->vma); |
| 866 | offsets->offsets[SECT_OFF_BSS (objfile)] |
| 867 | = ANOFFSET (offsets, SECT_OFF_DATA (objfile)); |
| 868 | return 1; |
| 869 | } |
| 870 | so_list = so_list->next; |
| 871 | } |
| 872 | return 0; |
| 873 | } |