| 1 | /* Shared library support for IRIX. |
| 2 | Copyright (C) 1993-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file was created using portions of irix5-nat.c originally |
| 5 | contributed to GDB by Ian Lance Taylor. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | |
| 24 | #include "symtab.h" |
| 25 | #include "bfd.h" |
| 26 | /* FIXME: ezannoni/2004-02-13 Verify that the include below is |
| 27 | really needed. */ |
| 28 | #include "symfile.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "target.h" |
| 32 | #include "inferior.h" |
| 33 | #include "infrun.h" |
| 34 | #include "gdbthread.h" |
| 35 | |
| 36 | #include "solist.h" |
| 37 | #include "solib.h" |
| 38 | #include "solib-irix.h" |
| 39 | |
| 40 | |
| 41 | /* Link map info to include in an allocate so_list entry. Unlike some |
| 42 | of the other solib backends, this (Irix) backend chooses to decode |
| 43 | the link map info obtained from the target and store it as (mostly) |
| 44 | CORE_ADDRs which need no further decoding. This is more convenient |
| 45 | because there are three different link map formats to worry about. |
| 46 | We use a single routine (fetch_lm_info) to read (and decode) the target |
| 47 | specific link map data. */ |
| 48 | |
| 49 | struct lm_info |
| 50 | { |
| 51 | CORE_ADDR addr; /* address of obj_info or obj_list |
| 52 | struct on target (from which the |
| 53 | following information is obtained). */ |
| 54 | CORE_ADDR next; /* address of next item in list. */ |
| 55 | CORE_ADDR reloc_offset; /* amount to relocate by */ |
| 56 | CORE_ADDR pathname_addr; /* address of pathname */ |
| 57 | int pathname_len; /* length of pathname */ |
| 58 | }; |
| 59 | |
| 60 | /* It's not desirable to use the system header files to obtain the |
| 61 | structure of the obj_list or obj_info structs. Therefore, we use a |
| 62 | platform neutral representation which has been derived from the IRIX |
| 63 | header files. */ |
| 64 | |
| 65 | typedef struct |
| 66 | { |
| 67 | gdb_byte b[4]; |
| 68 | } |
| 69 | gdb_int32_bytes; |
| 70 | typedef struct |
| 71 | { |
| 72 | gdb_byte b[8]; |
| 73 | } |
| 74 | gdb_int64_bytes; |
| 75 | |
| 76 | /* The "old" obj_list struct. This is used with old (o32) binaries. |
| 77 | The ``data'' member points at a much larger and more complicated |
| 78 | struct which we will only refer to by offsets. See |
| 79 | fetch_lm_info(). */ |
| 80 | |
| 81 | struct irix_obj_list |
| 82 | { |
| 83 | gdb_int32_bytes data; |
| 84 | gdb_int32_bytes next; |
| 85 | gdb_int32_bytes prev; |
| 86 | }; |
| 87 | |
| 88 | /* The ELF32 and ELF64 versions of the above struct. The oi_magic value |
| 89 | corresponds to the ``data'' value in the "old" struct. When this value |
| 90 | is 0xffffffff, the data will be in one of the following formats. The |
| 91 | ``oi_size'' field is used to decide which one we actually have. */ |
| 92 | |
| 93 | struct irix_elf32_obj_info |
| 94 | { |
| 95 | gdb_int32_bytes oi_magic; |
| 96 | gdb_int32_bytes oi_size; |
| 97 | gdb_int32_bytes oi_next; |
| 98 | gdb_int32_bytes oi_prev; |
| 99 | gdb_int32_bytes oi_ehdr; |
| 100 | gdb_int32_bytes oi_orig_ehdr; |
| 101 | gdb_int32_bytes oi_pathname; |
| 102 | gdb_int32_bytes oi_pathname_len; |
| 103 | }; |
| 104 | |
| 105 | struct irix_elf64_obj_info |
| 106 | { |
| 107 | gdb_int32_bytes oi_magic; |
| 108 | gdb_int32_bytes oi_size; |
| 109 | gdb_int64_bytes oi_next; |
| 110 | gdb_int64_bytes oi_prev; |
| 111 | gdb_int64_bytes oi_ehdr; |
| 112 | gdb_int64_bytes oi_orig_ehdr; |
| 113 | gdb_int64_bytes oi_pathname; |
| 114 | gdb_int32_bytes oi_pathname_len; |
| 115 | gdb_int32_bytes padding; |
| 116 | }; |
| 117 | |
| 118 | /* Union of all of the above (plus a split out magic field). */ |
| 119 | |
| 120 | union irix_obj_info |
| 121 | { |
| 122 | gdb_int32_bytes magic; |
| 123 | struct irix_obj_list ol32; |
| 124 | struct irix_elf32_obj_info oi32; |
| 125 | struct irix_elf64_obj_info oi64; |
| 126 | }; |
| 127 | |
| 128 | /* MIPS sign extends its 32 bit addresses. We could conceivably use |
| 129 | extract_typed_address here, but to do so, we'd have to construct an |
| 130 | appropriate type. Calling extract_signed_integer seems simpler. */ |
| 131 | |
| 132 | static CORE_ADDR |
| 133 | extract_mips_address (void *addr, int len, enum bfd_endian byte_order) |
| 134 | { |
| 135 | return extract_signed_integer (addr, len, byte_order); |
| 136 | } |
| 137 | |
| 138 | /* Fetch and return the link map data associated with ADDR. Note that |
| 139 | this routine automatically determines which (of three) link map |
| 140 | formats is in use by the target. */ |
| 141 | |
| 142 | static struct lm_info |
| 143 | fetch_lm_info (CORE_ADDR addr) |
| 144 | { |
| 145 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 146 | struct lm_info li; |
| 147 | union irix_obj_info buf; |
| 148 | |
| 149 | li.addr = addr; |
| 150 | |
| 151 | /* The smallest region that we'll need is for buf.ol32. We'll read |
| 152 | that first. We'll read more of the buffer later if we have to deal |
| 153 | with one of the other cases. (We don't want to incur a memory error |
| 154 | if we were to read a larger region that generates an error due to |
| 155 | being at the end of a page or the like.) */ |
| 156 | read_memory (addr, (gdb_byte *) &buf, sizeof (buf.ol32)); |
| 157 | |
| 158 | if (extract_unsigned_integer (buf.magic.b, sizeof (buf.magic), byte_order) |
| 159 | != 0xffffffff) |
| 160 | { |
| 161 | /* Use buf.ol32... */ |
| 162 | gdb_byte obj_buf[432]; |
| 163 | CORE_ADDR obj_addr = extract_mips_address (&buf.ol32.data, |
| 164 | sizeof (buf.ol32.data), |
| 165 | byte_order); |
| 166 | |
| 167 | li.next = extract_mips_address (&buf.ol32.next, |
| 168 | sizeof (buf.ol32.next), byte_order); |
| 169 | |
| 170 | read_memory (obj_addr, obj_buf, sizeof (obj_buf)); |
| 171 | |
| 172 | li.pathname_addr = extract_mips_address (&obj_buf[236], 4, byte_order); |
| 173 | li.pathname_len = 0; /* unknown */ |
| 174 | li.reloc_offset = extract_mips_address (&obj_buf[196], 4, byte_order) |
| 175 | - extract_mips_address (&obj_buf[248], 4, byte_order); |
| 176 | |
| 177 | } |
| 178 | else if (extract_unsigned_integer (buf.oi32.oi_size.b, |
| 179 | sizeof (buf.oi32.oi_size), byte_order) |
| 180 | == sizeof (buf.oi32)) |
| 181 | { |
| 182 | /* Use buf.oi32... */ |
| 183 | |
| 184 | /* Read rest of buffer. */ |
| 185 | read_memory (addr + sizeof (buf.ol32), |
| 186 | ((gdb_byte *) &buf) + sizeof (buf.ol32), |
| 187 | sizeof (buf.oi32) - sizeof (buf.ol32)); |
| 188 | |
| 189 | /* Fill in fields using buffer contents. */ |
| 190 | li.next = extract_mips_address (&buf.oi32.oi_next, |
| 191 | sizeof (buf.oi32.oi_next), byte_order); |
| 192 | li.reloc_offset = extract_mips_address (&buf.oi32.oi_ehdr, |
| 193 | sizeof (buf.oi32.oi_ehdr), |
| 194 | byte_order) |
| 195 | - extract_mips_address (&buf.oi32.oi_orig_ehdr, |
| 196 | sizeof (buf.oi32.oi_orig_ehdr), byte_order); |
| 197 | li.pathname_addr = extract_mips_address (&buf.oi32.oi_pathname, |
| 198 | sizeof (buf.oi32.oi_pathname), |
| 199 | byte_order); |
| 200 | li.pathname_len = extract_unsigned_integer (buf.oi32.oi_pathname_len.b, |
| 201 | sizeof (buf.oi32. |
| 202 | oi_pathname_len), |
| 203 | byte_order); |
| 204 | } |
| 205 | else if (extract_unsigned_integer (buf.oi64.oi_size.b, |
| 206 | sizeof (buf.oi64.oi_size), byte_order) |
| 207 | == sizeof (buf.oi64)) |
| 208 | { |
| 209 | /* Use buf.oi64... */ |
| 210 | |
| 211 | /* Read rest of buffer. */ |
| 212 | read_memory (addr + sizeof (buf.ol32), |
| 213 | ((gdb_byte *) &buf) + sizeof (buf.ol32), |
| 214 | sizeof (buf.oi64) - sizeof (buf.ol32)); |
| 215 | |
| 216 | /* Fill in fields using buffer contents. */ |
| 217 | li.next = extract_mips_address (&buf.oi64.oi_next, |
| 218 | sizeof (buf.oi64.oi_next), byte_order); |
| 219 | li.reloc_offset = extract_mips_address (&buf.oi64.oi_ehdr, |
| 220 | sizeof (buf.oi64.oi_ehdr), |
| 221 | byte_order) |
| 222 | - extract_mips_address (&buf.oi64.oi_orig_ehdr, |
| 223 | sizeof (buf.oi64.oi_orig_ehdr), byte_order); |
| 224 | li.pathname_addr = extract_mips_address (&buf.oi64.oi_pathname, |
| 225 | sizeof (buf.oi64.oi_pathname), |
| 226 | byte_order); |
| 227 | li.pathname_len = extract_unsigned_integer (buf.oi64.oi_pathname_len.b, |
| 228 | sizeof (buf.oi64. |
| 229 | oi_pathname_len), |
| 230 | byte_order); |
| 231 | } |
| 232 | else |
| 233 | { |
| 234 | error (_("Unable to fetch shared library obj_info or obj_list info.")); |
| 235 | } |
| 236 | |
| 237 | return li; |
| 238 | } |
| 239 | |
| 240 | /* The symbol which starts off the list of shared libraries. */ |
| 241 | #define DEBUG_BASE "__rld_obj_head" |
| 242 | |
| 243 | static void *base_breakpoint; |
| 244 | |
| 245 | static CORE_ADDR debug_base; /* Base of dynamic linker structures. */ |
| 246 | |
| 247 | /* Locate the base address of dynamic linker structs. |
| 248 | |
| 249 | For both the SunOS and SVR4 shared library implementations, if the |
| 250 | inferior executable has been linked dynamically, there is a single |
| 251 | address somewhere in the inferior's data space which is the key to |
| 252 | locating all of the dynamic linker's runtime structures. This |
| 253 | address is the value of the symbol defined by the macro DEBUG_BASE. |
| 254 | The job of this function is to find and return that address, or to |
| 255 | return 0 if there is no such address (the executable is statically |
| 256 | linked for example). |
| 257 | |
| 258 | For SunOS, the job is almost trivial, since the dynamic linker and |
| 259 | all of it's structures are statically linked to the executable at |
| 260 | link time. Thus the symbol for the address we are looking for has |
| 261 | already been added to the minimal symbol table for the executable's |
| 262 | objfile at the time the symbol file's symbols were read, and all we |
| 263 | have to do is look it up there. Note that we explicitly do NOT want |
| 264 | to find the copies in the shared library. |
| 265 | |
| 266 | The SVR4 version is much more complicated because the dynamic linker |
| 267 | and it's structures are located in the shared C library, which gets |
| 268 | run as the executable's "interpreter" by the kernel. We have to go |
| 269 | to a lot more work to discover the address of DEBUG_BASE. Because |
| 270 | of this complexity, we cache the value we find and return that value |
| 271 | on subsequent invocations. Note there is no copy in the executable |
| 272 | symbol tables. |
| 273 | |
| 274 | Irix 5 is basically like SunOS. |
| 275 | |
| 276 | Note that we can assume nothing about the process state at the time |
| 277 | we need to find this address. We may be stopped on the first instruc- |
| 278 | tion of the interpreter (C shared library), the first instruction of |
| 279 | the executable itself, or somewhere else entirely (if we attached |
| 280 | to the process for example). */ |
| 281 | |
| 282 | static CORE_ADDR |
| 283 | locate_base (void) |
| 284 | { |
| 285 | struct bound_minimal_symbol msymbol; |
| 286 | CORE_ADDR address = 0; |
| 287 | |
| 288 | msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile); |
| 289 | if ((msymbol.minsym != NULL) && (BMSYMBOL_VALUE_ADDRESS (msymbol) != 0)) |
| 290 | { |
| 291 | address = BMSYMBOL_VALUE_ADDRESS (msymbol); |
| 292 | } |
| 293 | return (address); |
| 294 | } |
| 295 | |
| 296 | /* Remove the "mapping changed" breakpoint. |
| 297 | |
| 298 | Removes the breakpoint that gets hit when the dynamic linker |
| 299 | completes a mapping change. */ |
| 300 | |
| 301 | static int |
| 302 | disable_break (void) |
| 303 | { |
| 304 | int status = 1; |
| 305 | |
| 306 | /* Note that breakpoint address and original contents are in our address |
| 307 | space, so we just need to write the original contents back. */ |
| 308 | |
| 309 | if (deprecated_remove_raw_breakpoint (target_gdbarch (), base_breakpoint) != 0) |
| 310 | { |
| 311 | status = 0; |
| 312 | } |
| 313 | |
| 314 | base_breakpoint = NULL; |
| 315 | |
| 316 | /* Note that it is possible that we have stopped at a location that |
| 317 | is different from the location where we inserted our breakpoint. |
| 318 | On mips-irix, we can actually land in __dbx_init(), so we should |
| 319 | not check the PC against our breakpoint address here. See procfs.c |
| 320 | for more details. */ |
| 321 | |
| 322 | return (status); |
| 323 | } |
| 324 | |
| 325 | /* Arrange for dynamic linker to hit breakpoint. |
| 326 | |
| 327 | This functions inserts a breakpoint at the entry point of the |
| 328 | main executable, where all shared libraries are mapped in. */ |
| 329 | |
| 330 | static int |
| 331 | enable_break (void) |
| 332 | { |
| 333 | if (symfile_objfile != NULL && has_stack_frames ()) |
| 334 | { |
| 335 | struct frame_info *frame = get_current_frame (); |
| 336 | struct address_space *aspace = get_frame_address_space (frame); |
| 337 | CORE_ADDR entry_point; |
| 338 | |
| 339 | if (!entry_point_address_query (&entry_point)) |
| 340 | return 0; |
| 341 | |
| 342 | base_breakpoint = deprecated_insert_raw_breakpoint (target_gdbarch (), |
| 343 | aspace, entry_point); |
| 344 | |
| 345 | if (base_breakpoint != NULL) |
| 346 | return 1; |
| 347 | } |
| 348 | |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | /* Implement the "create_inferior_hook" target_solib_ops method. |
| 353 | |
| 354 | For SunOS executables, this first instruction is typically the |
| 355 | one at "_start", or a similar text label, regardless of whether |
| 356 | the executable is statically or dynamically linked. The runtime |
| 357 | startup code takes care of dynamically linking in any shared |
| 358 | libraries, once gdb allows the inferior to continue. |
| 359 | |
| 360 | For SVR4 executables, this first instruction is either the first |
| 361 | instruction in the dynamic linker (for dynamically linked |
| 362 | executables) or the instruction at "start" for statically linked |
| 363 | executables. For dynamically linked executables, the system |
| 364 | first exec's /lib/libc.so.N, which contains the dynamic linker, |
| 365 | and starts it running. The dynamic linker maps in any needed |
| 366 | shared libraries, maps in the actual user executable, and then |
| 367 | jumps to "start" in the user executable. |
| 368 | |
| 369 | For both SunOS shared libraries, and SVR4 shared libraries, we |
| 370 | can arrange to cooperate with the dynamic linker to discover the |
| 371 | names of shared libraries that are dynamically linked, and the |
| 372 | base addresses to which they are linked. |
| 373 | |
| 374 | This function is responsible for discovering those names and |
| 375 | addresses, and saving sufficient information about them to allow |
| 376 | their symbols to be read at a later time. |
| 377 | |
| 378 | FIXME |
| 379 | |
| 380 | Between enable_break() and disable_break(), this code does not |
| 381 | properly handle hitting breakpoints which the user might have |
| 382 | set in the startup code or in the dynamic linker itself. Proper |
| 383 | handling will probably have to wait until the implementation is |
| 384 | changed to use the "breakpoint handler function" method. |
| 385 | |
| 386 | Also, what if child has exit()ed? Must exit loop somehow. */ |
| 387 | |
| 388 | static void |
| 389 | irix_solib_create_inferior_hook (int from_tty) |
| 390 | { |
| 391 | struct inferior *inf; |
| 392 | struct thread_info *tp; |
| 393 | |
| 394 | inf = current_inferior (); |
| 395 | |
| 396 | /* If we are attaching to the inferior, the shared libraries |
| 397 | have already been mapped, so nothing more to do. */ |
| 398 | if (inf->attach_flag) |
| 399 | return; |
| 400 | |
| 401 | /* Likewise when debugging from a core file, the shared libraries |
| 402 | have already been mapped, so nothing more to do. */ |
| 403 | if (!target_can_run (¤t_target)) |
| 404 | return; |
| 405 | |
| 406 | if (!enable_break ()) |
| 407 | { |
| 408 | warning (_("shared library handler failed to enable breakpoint")); |
| 409 | return; |
| 410 | } |
| 411 | |
| 412 | /* Now run the target. It will eventually hit the breakpoint, at |
| 413 | which point all of the libraries will have been mapped in and we |
| 414 | can go groveling around in the dynamic linker structures to find |
| 415 | out what we need to know about them. */ |
| 416 | |
| 417 | tp = inferior_thread (); |
| 418 | |
| 419 | clear_proceed_status (); |
| 420 | |
| 421 | inf->control.stop_soon = STOP_QUIETLY; |
| 422 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
| 423 | |
| 424 | do |
| 425 | { |
| 426 | target_resume (pid_to_ptid (-1), 0, tp->suspend.stop_signal); |
| 427 | wait_for_inferior (); |
| 428 | } |
| 429 | while (tp->suspend.stop_signal != GDB_SIGNAL_TRAP); |
| 430 | |
| 431 | /* We are now either at the "mapping complete" breakpoint (or somewhere |
| 432 | else, a condition we aren't prepared to deal with anyway), so adjust |
| 433 | the PC as necessary after a breakpoint, disable the breakpoint, and |
| 434 | add any shared libraries that were mapped in. */ |
| 435 | |
| 436 | if (!disable_break ()) |
| 437 | { |
| 438 | warning (_("shared library handler failed to disable breakpoint")); |
| 439 | } |
| 440 | |
| 441 | /* solib_add will call reinit_frame_cache. |
| 442 | But we are stopped in the startup code and we might not have symbols |
| 443 | for the startup code, so heuristic_proc_start could be called |
| 444 | and will put out an annoying warning. |
| 445 | Delaying the resetting of stop_soon until after symbol loading |
| 446 | suppresses the warning. */ |
| 447 | solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add); |
| 448 | inf->control.stop_soon = NO_STOP_QUIETLY; |
| 449 | } |
| 450 | |
| 451 | /* Implement the "current_sos" target_so_ops method. */ |
| 452 | |
| 453 | static struct so_list * |
| 454 | irix_current_sos (void) |
| 455 | { |
| 456 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 457 | int addr_size = gdbarch_addr_bit (target_gdbarch ()) / TARGET_CHAR_BIT; |
| 458 | CORE_ADDR lma; |
| 459 | gdb_byte addr_buf[8]; |
| 460 | struct so_list *head = 0; |
| 461 | struct so_list **link_ptr = &head; |
| 462 | int is_first = 1; |
| 463 | struct lm_info lm; |
| 464 | |
| 465 | /* Make sure we've looked up the inferior's dynamic linker's base |
| 466 | structure. */ |
| 467 | if (!debug_base) |
| 468 | { |
| 469 | debug_base = locate_base (); |
| 470 | |
| 471 | /* If we can't find the dynamic linker's base structure, this |
| 472 | must not be a dynamically linked executable. Hmm. */ |
| 473 | if (!debug_base) |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | read_memory (debug_base, addr_buf, addr_size); |
| 478 | lma = extract_mips_address (addr_buf, addr_size, byte_order); |
| 479 | |
| 480 | while (lma) |
| 481 | { |
| 482 | lm = fetch_lm_info (lma); |
| 483 | if (!is_first) |
| 484 | { |
| 485 | int errcode; |
| 486 | char *name_buf; |
| 487 | int name_size; |
| 488 | struct so_list *new |
| 489 | = (struct so_list *) xmalloc (sizeof (struct so_list)); |
| 490 | struct cleanup *old_chain = make_cleanup (xfree, new); |
| 491 | |
| 492 | memset (new, 0, sizeof (*new)); |
| 493 | |
| 494 | new->lm_info = xmalloc (sizeof (struct lm_info)); |
| 495 | make_cleanup (xfree, new->lm_info); |
| 496 | |
| 497 | *new->lm_info = lm; |
| 498 | |
| 499 | /* Extract this shared object's name. */ |
| 500 | name_size = lm.pathname_len; |
| 501 | if (name_size == 0) |
| 502 | name_size = SO_NAME_MAX_PATH_SIZE - 1; |
| 503 | |
| 504 | if (name_size >= SO_NAME_MAX_PATH_SIZE) |
| 505 | { |
| 506 | name_size = SO_NAME_MAX_PATH_SIZE - 1; |
| 507 | warning (_("current_sos: truncating name of " |
| 508 | "%d characters to only %d characters"), |
| 509 | lm.pathname_len, name_size); |
| 510 | } |
| 511 | |
| 512 | target_read_string (lm.pathname_addr, &name_buf, |
| 513 | name_size, &errcode); |
| 514 | if (errcode != 0) |
| 515 | warning (_("Can't read pathname for load map: %s."), |
| 516 | safe_strerror (errcode)); |
| 517 | else |
| 518 | { |
| 519 | strncpy (new->so_name, name_buf, name_size); |
| 520 | new->so_name[name_size] = '\0'; |
| 521 | xfree (name_buf); |
| 522 | strcpy (new->so_original_name, new->so_name); |
| 523 | } |
| 524 | |
| 525 | new->next = 0; |
| 526 | *link_ptr = new; |
| 527 | link_ptr = &new->next; |
| 528 | |
| 529 | discard_cleanups (old_chain); |
| 530 | } |
| 531 | is_first = 0; |
| 532 | lma = lm.next; |
| 533 | } |
| 534 | |
| 535 | return head; |
| 536 | } |
| 537 | |
| 538 | /* Implement the "open_symbol_file_object" target_so_ops method. |
| 539 | |
| 540 | If no open symbol file, attempt to locate and open the main symbol |
| 541 | file. On IRIX, this is the first link map entry. If its name is |
| 542 | here, we can open it. Useful when attaching to a process without |
| 543 | first loading its symbol file. */ |
| 544 | |
| 545 | static int |
| 546 | irix_open_symbol_file_object (void *from_ttyp) |
| 547 | { |
| 548 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 549 | int addr_size = gdbarch_addr_bit (target_gdbarch ()) / TARGET_CHAR_BIT; |
| 550 | CORE_ADDR lma; |
| 551 | gdb_byte addr_buf[8]; |
| 552 | struct lm_info lm; |
| 553 | struct cleanup *cleanups; |
| 554 | int errcode; |
| 555 | int from_tty = *(int *) from_ttyp; |
| 556 | char *filename; |
| 557 | |
| 558 | if (symfile_objfile) |
| 559 | if (!query (_("Attempt to reload symbols from process? "))) |
| 560 | return 0; |
| 561 | |
| 562 | if ((debug_base = locate_base ()) == 0) |
| 563 | return 0; /* failed somehow... */ |
| 564 | |
| 565 | /* First link map member should be the executable. */ |
| 566 | read_memory (debug_base, addr_buf, addr_size); |
| 567 | lma = extract_mips_address (addr_buf, addr_size, byte_order); |
| 568 | if (lma == 0) |
| 569 | return 0; /* failed somehow... */ |
| 570 | |
| 571 | lm = fetch_lm_info (lma); |
| 572 | |
| 573 | if (lm.pathname_addr == 0) |
| 574 | return 0; /* No filename. */ |
| 575 | |
| 576 | /* Now fetch the filename from target memory. */ |
| 577 | target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1, |
| 578 | &errcode); |
| 579 | |
| 580 | if (errcode) |
| 581 | { |
| 582 | warning (_("failed to read exec filename from attached file: %s"), |
| 583 | safe_strerror (errcode)); |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | cleanups = make_cleanup (xfree, filename); |
| 588 | /* Have a pathname: read the symbol file. */ |
| 589 | symbol_file_add_main (filename, from_tty); |
| 590 | |
| 591 | do_cleanups (cleanups); |
| 592 | |
| 593 | return 1; |
| 594 | } |
| 595 | |
| 596 | /* Implement the "special_symbol_handling" target_so_ops method. |
| 597 | |
| 598 | For IRIX, there's nothing to do. */ |
| 599 | |
| 600 | static void |
| 601 | irix_special_symbol_handling (void) |
| 602 | { |
| 603 | } |
| 604 | |
| 605 | /* Using the solist entry SO, relocate the addresses in SEC. */ |
| 606 | |
| 607 | static void |
| 608 | irix_relocate_section_addresses (struct so_list *so, |
| 609 | struct target_section *sec) |
| 610 | { |
| 611 | sec->addr += so->lm_info->reloc_offset; |
| 612 | sec->endaddr += so->lm_info->reloc_offset; |
| 613 | } |
| 614 | |
| 615 | /* Free the lm_info struct. */ |
| 616 | |
| 617 | static void |
| 618 | irix_free_so (struct so_list *so) |
| 619 | { |
| 620 | xfree (so->lm_info); |
| 621 | } |
| 622 | |
| 623 | /* Clear backend specific state. */ |
| 624 | |
| 625 | static void |
| 626 | irix_clear_solib (void) |
| 627 | { |
| 628 | debug_base = 0; |
| 629 | } |
| 630 | |
| 631 | /* Return 1 if PC lies in the dynamic symbol resolution code of the |
| 632 | run time loader. */ |
| 633 | static int |
| 634 | irix_in_dynsym_resolve_code (CORE_ADDR pc) |
| 635 | { |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | struct target_so_ops irix_so_ops; |
| 640 | |
| 641 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 642 | extern initialize_file_ftype _initialize_irix_solib; |
| 643 | |
| 644 | void |
| 645 | _initialize_irix_solib (void) |
| 646 | { |
| 647 | irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses; |
| 648 | irix_so_ops.free_so = irix_free_so; |
| 649 | irix_so_ops.clear_solib = irix_clear_solib; |
| 650 | irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook; |
| 651 | irix_so_ops.special_symbol_handling = irix_special_symbol_handling; |
| 652 | irix_so_ops.current_sos = irix_current_sos; |
| 653 | irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object; |
| 654 | irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code; |
| 655 | irix_so_ops.bfd_open = solib_bfd_open; |
| 656 | } |