| 1 | /* IBM RS/6000 native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1994, 1995, 1996, 1997, 1998 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "target.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "xcoffsolib.h" |
| 27 | #include "symfile.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "libbfd.h" /* For bfd_cache_lookup (FIXME) */ |
| 30 | #include "bfd.h" |
| 31 | #include "gdb-stabs.h" |
| 32 | |
| 33 | #include <sys/ptrace.h> |
| 34 | #include <sys/reg.h> |
| 35 | |
| 36 | #include <sys/param.h> |
| 37 | #include <sys/dir.h> |
| 38 | #include <sys/user.h> |
| 39 | #include <signal.h> |
| 40 | #include <sys/ioctl.h> |
| 41 | #include <fcntl.h> |
| 42 | |
| 43 | #include <a.out.h> |
| 44 | #include <sys/file.h> |
| 45 | #include "gdb_stat.h" |
| 46 | #include <sys/core.h> |
| 47 | #include <sys/ldr.h> |
| 48 | |
| 49 | extern int errno; |
| 50 | |
| 51 | extern struct vmap *map_vmap PARAMS ((bfd * bf, bfd * arch)); |
| 52 | |
| 53 | extern struct target_ops exec_ops; |
| 54 | |
| 55 | static void |
| 56 | vmap_exec PARAMS ((void)); |
| 57 | |
| 58 | static void |
| 59 | vmap_ldinfo PARAMS ((struct ld_info *)); |
| 60 | |
| 61 | static struct vmap * |
| 62 | add_vmap PARAMS ((struct ld_info *)); |
| 63 | |
| 64 | static int |
| 65 | objfile_symbol_add PARAMS ((char *)); |
| 66 | |
| 67 | static void |
| 68 | vmap_symtab PARAMS ((struct vmap *)); |
| 69 | |
| 70 | static void |
| 71 | fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR)); |
| 72 | |
| 73 | static void |
| 74 | exec_one_dummy_insn PARAMS ((void)); |
| 75 | |
| 76 | extern void |
| 77 | fixup_breakpoints PARAMS ((CORE_ADDR low, CORE_ADDR high, CORE_ADDR delta)); |
| 78 | |
| 79 | /* Conversion from gdb-to-system special purpose register numbers.. */ |
| 80 | |
| 81 | static int special_regs[] = |
| 82 | { |
| 83 | IAR, /* PC_REGNUM */ |
| 84 | MSR, /* PS_REGNUM */ |
| 85 | CR, /* CR_REGNUM */ |
| 86 | LR, /* LR_REGNUM */ |
| 87 | CTR, /* CTR_REGNUM */ |
| 88 | XER, /* XER_REGNUM */ |
| 89 | MQ /* MQ_REGNUM */ |
| 90 | }; |
| 91 | |
| 92 | void |
| 93 | fetch_inferior_registers (regno) |
| 94 | int regno; |
| 95 | { |
| 96 | int ii; |
| 97 | |
| 98 | if (regno < 0) |
| 99 | { /* for all registers */ |
| 100 | |
| 101 | /* read 32 general purpose registers. */ |
| 102 | |
| 103 | for (ii = 0; ii < 32; ++ii) |
| 104 | *(int *) ®isters[REGISTER_BYTE (ii)] = |
| 105 | ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0); |
| 106 | |
| 107 | /* read general purpose floating point registers. */ |
| 108 | |
| 109 | for (ii = 0; ii < 32; ++ii) |
| 110 | ptrace (PT_READ_FPR, inferior_pid, |
| 111 | (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (FP0_REGNUM + ii)], |
| 112 | FPR0 + ii, 0); |
| 113 | |
| 114 | /* read special registers. */ |
| 115 | for (ii = 0; ii <= LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM; ++ii) |
| 116 | *(int *) ®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM + ii)] = |
| 117 | ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii], |
| 118 | 0, 0); |
| 119 | |
| 120 | registers_fetched (); |
| 121 | return; |
| 122 | } |
| 123 | |
| 124 | /* else an individual register is addressed. */ |
| 125 | |
| 126 | else if (regno < FP0_REGNUM) |
| 127 | { /* a GPR */ |
| 128 | *(int *) ®isters[REGISTER_BYTE (regno)] = |
| 129 | ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0); |
| 130 | } |
| 131 | else if (regno <= FPLAST_REGNUM) |
| 132 | { /* a FPR */ |
| 133 | ptrace (PT_READ_FPR, inferior_pid, |
| 134 | (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (regno)], |
| 135 | (regno - FP0_REGNUM + FPR0), 0); |
| 136 | } |
| 137 | else if (regno <= LAST_UISA_SP_REGNUM) |
| 138 | { /* a special register */ |
| 139 | *(int *) ®isters[REGISTER_BYTE (regno)] = |
| 140 | ptrace (PT_READ_GPR, inferior_pid, |
| 141 | (PTRACE_ARG3_TYPE) special_regs[regno - FIRST_UISA_SP_REGNUM], |
| 142 | 0, 0); |
| 143 | } |
| 144 | else |
| 145 | fprintf_unfiltered (gdb_stderr, |
| 146 | "gdb error: register no %d not implemented.\n", |
| 147 | regno); |
| 148 | |
| 149 | register_valid[regno] = 1; |
| 150 | } |
| 151 | |
| 152 | /* Store our register values back into the inferior. |
| 153 | If REGNO is -1, do this for all registers. |
| 154 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 155 | |
| 156 | void |
| 157 | store_inferior_registers (regno) |
| 158 | int regno; |
| 159 | { |
| 160 | |
| 161 | errno = 0; |
| 162 | |
| 163 | if (regno == -1) |
| 164 | { /* for all registers.. */ |
| 165 | int ii; |
| 166 | |
| 167 | /* execute one dummy instruction (which is a breakpoint) in inferior |
| 168 | process. So give kernel a chance to do internal house keeping. |
| 169 | Otherwise the following ptrace(2) calls will mess up user stack |
| 170 | since kernel will get confused about the bottom of the stack (%sp) */ |
| 171 | |
| 172 | exec_one_dummy_insn (); |
| 173 | |
| 174 | /* write general purpose registers first! */ |
| 175 | for (ii = GPR0; ii <= GPR31; ++ii) |
| 176 | { |
| 177 | ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, |
| 178 | *(int *) ®isters[REGISTER_BYTE (ii)], 0); |
| 179 | if (errno) |
| 180 | { |
| 181 | perror ("ptrace write_gpr"); |
| 182 | errno = 0; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /* write floating point registers now. */ |
| 187 | for (ii = 0; ii < 32; ++ii) |
| 188 | { |
| 189 | ptrace (PT_WRITE_FPR, inferior_pid, |
| 190 | (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (FP0_REGNUM + ii)], |
| 191 | FPR0 + ii, 0); |
| 192 | if (errno) |
| 193 | { |
| 194 | perror ("ptrace write_fpr"); |
| 195 | errno = 0; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | /* write special registers. */ |
| 200 | for (ii = 0; ii <= LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM; ++ii) |
| 201 | { |
| 202 | ptrace (PT_WRITE_GPR, inferior_pid, |
| 203 | (PTRACE_ARG3_TYPE) special_regs[ii], |
| 204 | *(int *) ®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM + ii)], |
| 205 | 0); |
| 206 | if (errno) |
| 207 | { |
| 208 | perror ("ptrace write_gpr"); |
| 209 | errno = 0; |
| 210 | } |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | /* else, a specific register number is given... */ |
| 215 | |
| 216 | else if (regno < FP0_REGNUM) /* a GPR */ |
| 217 | { |
| 218 | if (regno == SP_REGNUM) |
| 219 | exec_one_dummy_insn (); |
| 220 | ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, |
| 221 | *(int *) ®isters[REGISTER_BYTE (regno)], 0); |
| 222 | } |
| 223 | |
| 224 | else if (regno <= FPLAST_REGNUM) /* a FPR */ |
| 225 | { |
| 226 | ptrace (PT_WRITE_FPR, inferior_pid, |
| 227 | (PTRACE_ARG3_TYPE) & registers[REGISTER_BYTE (regno)], |
| 228 | regno - FP0_REGNUM + FPR0, 0); |
| 229 | } |
| 230 | |
| 231 | else if (regno <= LAST_UISA_SP_REGNUM) /* a special register */ |
| 232 | { |
| 233 | ptrace (PT_WRITE_GPR, inferior_pid, |
| 234 | (PTRACE_ARG3_TYPE) special_regs[regno - FIRST_UISA_SP_REGNUM], |
| 235 | *(int *) ®isters[REGISTER_BYTE (regno)], 0); |
| 236 | } |
| 237 | |
| 238 | else if (regno < NUM_REGS) |
| 239 | { |
| 240 | /* Ignore it. */ |
| 241 | } |
| 242 | |
| 243 | else |
| 244 | fprintf_unfiltered (gdb_stderr, |
| 245 | "Gdb error: register no %d not implemented.\n", |
| 246 | regno); |
| 247 | |
| 248 | if (errno) |
| 249 | { |
| 250 | perror ("ptrace write"); |
| 251 | errno = 0; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | /* Execute one dummy breakpoint instruction. This way we give the kernel |
| 256 | a chance to do some housekeeping and update inferior's internal data, |
| 257 | including u_area. */ |
| 258 | |
| 259 | static void |
| 260 | exec_one_dummy_insn () |
| 261 | { |
| 262 | #define DUMMY_INSN_ADDR (TEXT_SEGMENT_BASE)+0x200 |
| 263 | |
| 264 | char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */ |
| 265 | int status, pid; |
| 266 | CORE_ADDR prev_pc; |
| 267 | |
| 268 | /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We |
| 269 | assume that this address will never be executed again by the real |
| 270 | code. */ |
| 271 | |
| 272 | target_insert_breakpoint (DUMMY_INSN_ADDR, shadow_contents); |
| 273 | |
| 274 | errno = 0; |
| 275 | |
| 276 | /* You might think this could be done with a single ptrace call, and |
| 277 | you'd be correct for just about every platform I've ever worked |
| 278 | on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up -- |
| 279 | the inferior never hits the breakpoint (it's also worth noting |
| 280 | powerpc-ibm-aix4.1.3 works correctly). */ |
| 281 | prev_pc = read_pc (); |
| 282 | write_pc (DUMMY_INSN_ADDR); |
| 283 | ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, 0, 0); |
| 284 | |
| 285 | if (errno) |
| 286 | perror ("pt_continue"); |
| 287 | |
| 288 | do |
| 289 | { |
| 290 | pid = wait (&status); |
| 291 | } |
| 292 | while (pid != inferior_pid); |
| 293 | |
| 294 | write_pc (prev_pc); |
| 295 | target_remove_breakpoint (DUMMY_INSN_ADDR, shadow_contents); |
| 296 | } |
| 297 | |
| 298 | static void |
| 299 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 300 | char *core_reg_sect; |
| 301 | unsigned core_reg_size; |
| 302 | int which; |
| 303 | CORE_ADDR reg_addr; /* Unused in this version */ |
| 304 | { |
| 305 | /* fetch GPRs and special registers from the first register section |
| 306 | in core bfd. */ |
| 307 | if (which == 0) |
| 308 | { |
| 309 | /* copy GPRs first. */ |
| 310 | memcpy (registers, core_reg_sect, 32 * 4); |
| 311 | |
| 312 | /* gdb's internal register template and bfd's register section layout |
| 313 | should share a common include file. FIXMEmgo */ |
| 314 | /* then comes special registes. They are supposed to be in the same |
| 315 | order in gdb template and bfd `.reg' section. */ |
| 316 | core_reg_sect += (32 * 4); |
| 317 | memcpy (®isters[REGISTER_BYTE (FIRST_UISA_SP_REGNUM)], |
| 318 | core_reg_sect, |
| 319 | (LAST_UISA_SP_REGNUM - FIRST_UISA_SP_REGNUM + 1) * 4); |
| 320 | } |
| 321 | |
| 322 | /* fetch floating point registers from register section 2 in core bfd. */ |
| 323 | else if (which == 2) |
| 324 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 32 * 8); |
| 325 | |
| 326 | else |
| 327 | fprintf_unfiltered |
| 328 | (gdb_stderr, |
| 329 | "Gdb error: unknown parameter to fetch_core_registers().\n"); |
| 330 | } |
| 331 | \f |
| 332 | /* handle symbol translation on vmapping */ |
| 333 | |
| 334 | static void |
| 335 | vmap_symtab (vp) |
| 336 | register struct vmap *vp; |
| 337 | { |
| 338 | register struct objfile *objfile; |
| 339 | struct section_offsets *new_offsets; |
| 340 | int i; |
| 341 | |
| 342 | objfile = vp->objfile; |
| 343 | if (objfile == NULL) |
| 344 | { |
| 345 | /* OK, it's not an objfile we opened ourselves. |
| 346 | Currently, that can only happen with the exec file, so |
| 347 | relocate the symbols for the symfile. */ |
| 348 | if (symfile_objfile == NULL) |
| 349 | return; |
| 350 | objfile = symfile_objfile; |
| 351 | } |
| 352 | |
| 353 | new_offsets = (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS); |
| 354 | |
| 355 | for (i = 0; i < objfile->num_sections; ++i) |
| 356 | ANOFFSET (new_offsets, i) = ANOFFSET (objfile->section_offsets, i); |
| 357 | |
| 358 | /* The symbols in the object file are linked to the VMA of the section, |
| 359 | relocate them VMA relative. */ |
| 360 | ANOFFSET (new_offsets, SECT_OFF_TEXT) = vp->tstart - vp->tvma; |
| 361 | ANOFFSET (new_offsets, SECT_OFF_DATA) = vp->dstart - vp->dvma; |
| 362 | ANOFFSET (new_offsets, SECT_OFF_BSS) = vp->dstart - vp->dvma; |
| 363 | |
| 364 | objfile_relocate (objfile, new_offsets); |
| 365 | } |
| 366 | \f |
| 367 | /* Add symbols for an objfile. */ |
| 368 | |
| 369 | static int |
| 370 | objfile_symbol_add (arg) |
| 371 | char *arg; |
| 372 | { |
| 373 | struct objfile *obj = (struct objfile *) arg; |
| 374 | |
| 375 | syms_from_objfile (obj, NULL, 0, 0); |
| 376 | new_symfile_objfile (obj, 0, 0); |
| 377 | return 1; |
| 378 | } |
| 379 | |
| 380 | /* Add a new vmap entry based on ldinfo() information. |
| 381 | |
| 382 | If ldi->ldinfo_fd is not valid (e.g. this struct ld_info is from a |
| 383 | core file), the caller should set it to -1, and we will open the file. |
| 384 | |
| 385 | Return the vmap new entry. */ |
| 386 | |
| 387 | static struct vmap * |
| 388 | add_vmap (ldi) |
| 389 | register struct ld_info *ldi; |
| 390 | { |
| 391 | bfd *abfd, *last; |
| 392 | register char *mem, *objname; |
| 393 | struct objfile *obj; |
| 394 | struct vmap *vp; |
| 395 | |
| 396 | /* This ldi structure was allocated using alloca() in |
| 397 | xcoff_relocate_symtab(). Now we need to have persistent object |
| 398 | and member names, so we should save them. */ |
| 399 | |
| 400 | mem = ldi->ldinfo_filename + strlen (ldi->ldinfo_filename) + 1; |
| 401 | mem = savestring (mem, strlen (mem)); |
| 402 | objname = savestring (ldi->ldinfo_filename, strlen (ldi->ldinfo_filename)); |
| 403 | |
| 404 | if (ldi->ldinfo_fd < 0) |
| 405 | /* Note that this opens it once for every member; a possible |
| 406 | enhancement would be to only open it once for every object. */ |
| 407 | abfd = bfd_openr (objname, gnutarget); |
| 408 | else |
| 409 | abfd = bfd_fdopenr (objname, gnutarget, ldi->ldinfo_fd); |
| 410 | if (!abfd) |
| 411 | error ("Could not open `%s' as an executable file: %s", |
| 412 | objname, bfd_errmsg (bfd_get_error ())); |
| 413 | |
| 414 | /* make sure we have an object file */ |
| 415 | |
| 416 | if (bfd_check_format (abfd, bfd_object)) |
| 417 | vp = map_vmap (abfd, 0); |
| 418 | |
| 419 | else if (bfd_check_format (abfd, bfd_archive)) |
| 420 | { |
| 421 | last = 0; |
| 422 | /* FIXME??? am I tossing BFDs? bfd? */ |
| 423 | while ((last = bfd_openr_next_archived_file (abfd, last))) |
| 424 | if (STREQ (mem, last->filename)) |
| 425 | break; |
| 426 | |
| 427 | if (!last) |
| 428 | { |
| 429 | bfd_close (abfd); |
| 430 | /* FIXME -- should be error */ |
| 431 | warning ("\"%s\": member \"%s\" missing.", abfd->filename, mem); |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | if (!bfd_check_format (last, bfd_object)) |
| 436 | { |
| 437 | bfd_close (last); /* XXX??? */ |
| 438 | goto obj_err; |
| 439 | } |
| 440 | |
| 441 | vp = map_vmap (last, abfd); |
| 442 | } |
| 443 | else |
| 444 | { |
| 445 | obj_err: |
| 446 | bfd_close (abfd); |
| 447 | error ("\"%s\": not in executable format: %s.", |
| 448 | objname, bfd_errmsg (bfd_get_error ())); |
| 449 | /*NOTREACHED */ |
| 450 | } |
| 451 | obj = allocate_objfile (vp->bfd, 0); |
| 452 | vp->objfile = obj; |
| 453 | |
| 454 | #ifndef SOLIB_SYMBOLS_MANUAL |
| 455 | if (catch_errors (objfile_symbol_add, (char *) obj, |
| 456 | "Error while reading shared library symbols:\n", |
| 457 | RETURN_MASK_ALL)) |
| 458 | { |
| 459 | /* Note this is only done if symbol reading was successful. */ |
| 460 | vmap_symtab (vp); |
| 461 | vp->loaded = 1; |
| 462 | } |
| 463 | #endif |
| 464 | return vp; |
| 465 | } |
| 466 | \f |
| 467 | /* update VMAP info with ldinfo() information |
| 468 | Input is ptr to ldinfo() results. */ |
| 469 | |
| 470 | static void |
| 471 | vmap_ldinfo (ldi) |
| 472 | register struct ld_info *ldi; |
| 473 | { |
| 474 | struct stat ii, vi; |
| 475 | register struct vmap *vp; |
| 476 | int got_one, retried; |
| 477 | int got_exec_file = 0; |
| 478 | |
| 479 | /* For each *ldi, see if we have a corresponding *vp. |
| 480 | If so, update the mapping, and symbol table. |
| 481 | If not, add an entry and symbol table. */ |
| 482 | |
| 483 | do |
| 484 | { |
| 485 | char *name = ldi->ldinfo_filename; |
| 486 | char *memb = name + strlen (name) + 1; |
| 487 | |
| 488 | retried = 0; |
| 489 | |
| 490 | if (fstat (ldi->ldinfo_fd, &ii) < 0) |
| 491 | { |
| 492 | /* The kernel sets ld_info to -1, if the process is still using the |
| 493 | object, and the object is removed. Keep the symbol info for the |
| 494 | removed object and issue a warning. */ |
| 495 | warning ("%s (fd=%d) has disappeared, keeping its symbols", |
| 496 | name, ldi->ldinfo_fd); |
| 497 | continue; |
| 498 | } |
| 499 | retry: |
| 500 | for (got_one = 0, vp = vmap; vp; vp = vp->nxt) |
| 501 | { |
| 502 | struct objfile *objfile; |
| 503 | |
| 504 | /* First try to find a `vp', which is the same as in ldinfo. |
| 505 | If not the same, just continue and grep the next `vp'. If same, |
| 506 | relocate its tstart, tend, dstart, dend values. If no such `vp' |
| 507 | found, get out of this for loop, add this ldi entry as a new vmap |
| 508 | (add_vmap) and come back, find its `vp' and so on... */ |
| 509 | |
| 510 | /* The filenames are not always sufficient to match on. */ |
| 511 | |
| 512 | if ((name[0] == '/' && !STREQ (name, vp->name)) |
| 513 | || (memb[0] && !STREQ (memb, vp->member))) |
| 514 | continue; |
| 515 | |
| 516 | /* See if we are referring to the same file. |
| 517 | We have to check objfile->obfd, symfile.c:reread_symbols might |
| 518 | have updated the obfd after a change. */ |
| 519 | objfile = vp->objfile == NULL ? symfile_objfile : vp->objfile; |
| 520 | if (objfile == NULL |
| 521 | || objfile->obfd == NULL |
| 522 | || bfd_stat (objfile->obfd, &vi) < 0) |
| 523 | { |
| 524 | warning ("Unable to stat %s, keeping its symbols", name); |
| 525 | continue; |
| 526 | } |
| 527 | |
| 528 | if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino) |
| 529 | continue; |
| 530 | |
| 531 | if (!retried) |
| 532 | close (ldi->ldinfo_fd); |
| 533 | |
| 534 | ++got_one; |
| 535 | |
| 536 | /* Found a corresponding VMAP. Remap! */ |
| 537 | |
| 538 | /* We can assume pointer == CORE_ADDR, this code is native only. */ |
| 539 | vp->tstart = (CORE_ADDR) ldi->ldinfo_textorg; |
| 540 | vp->tend = vp->tstart + ldi->ldinfo_textsize; |
| 541 | vp->dstart = (CORE_ADDR) ldi->ldinfo_dataorg; |
| 542 | vp->dend = vp->dstart + ldi->ldinfo_datasize; |
| 543 | |
| 544 | /* The run time loader maps the file header in addition to the text |
| 545 | section and returns a pointer to the header in ldinfo_textorg. |
| 546 | Adjust the text start address to point to the real start address |
| 547 | of the text section. */ |
| 548 | vp->tstart += vp->toffs; |
| 549 | |
| 550 | /* The objfile is only NULL for the exec file. */ |
| 551 | if (vp->objfile == NULL) |
| 552 | got_exec_file = 1; |
| 553 | |
| 554 | /* relocate symbol table(s). */ |
| 555 | vmap_symtab (vp); |
| 556 | |
| 557 | /* There may be more, so we don't break out of the loop. */ |
| 558 | } |
| 559 | |
| 560 | /* if there was no matching *vp, we must perforce create the sucker(s) */ |
| 561 | if (!got_one && !retried) |
| 562 | { |
| 563 | add_vmap (ldi); |
| 564 | ++retried; |
| 565 | goto retry; |
| 566 | } |
| 567 | } |
| 568 | while (ldi->ldinfo_next |
| 569 | && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi))); |
| 570 | |
| 571 | /* If we don't find the symfile_objfile anywhere in the ldinfo, it |
| 572 | is unlikely that the symbol file is relocated to the proper |
| 573 | address. And we might have attached to a process which is |
| 574 | running a different copy of the same executable. */ |
| 575 | if (symfile_objfile != NULL && !got_exec_file) |
| 576 | { |
| 577 | warning_begin (); |
| 578 | fputs_unfiltered ("Symbol file ", gdb_stderr); |
| 579 | fputs_unfiltered (symfile_objfile->name, gdb_stderr); |
| 580 | fputs_unfiltered ("\nis not mapped; discarding it.\n\ |
| 581 | If in fact that file has symbols which the mapped files listed by\n\ |
| 582 | \"info files\" lack, you can load symbols with the \"symbol-file\" or\n\ |
| 583 | \"add-symbol-file\" commands (note that you must take care of relocating\n\ |
| 584 | symbols to the proper address).\n", gdb_stderr); |
| 585 | free_objfile (symfile_objfile); |
| 586 | symfile_objfile = NULL; |
| 587 | } |
| 588 | breakpoint_re_set (); |
| 589 | } |
| 590 | \f |
| 591 | /* As well as symbol tables, exec_sections need relocation. After |
| 592 | the inferior process' termination, there will be a relocated symbol |
| 593 | table exist with no corresponding inferior process. At that time, we |
| 594 | need to use `exec' bfd, rather than the inferior process's memory space |
| 595 | to look up symbols. |
| 596 | |
| 597 | `exec_sections' need to be relocated only once, as long as the exec |
| 598 | file remains unchanged. |
| 599 | */ |
| 600 | |
| 601 | static void |
| 602 | vmap_exec () |
| 603 | { |
| 604 | static bfd *execbfd; |
| 605 | int i; |
| 606 | |
| 607 | if (execbfd == exec_bfd) |
| 608 | return; |
| 609 | |
| 610 | execbfd = exec_bfd; |
| 611 | |
| 612 | if (!vmap || !exec_ops.to_sections) |
| 613 | error ("vmap_exec: vmap or exec_ops.to_sections == 0\n"); |
| 614 | |
| 615 | for (i = 0; &exec_ops.to_sections[i] < exec_ops.to_sections_end; i++) |
| 616 | { |
| 617 | if (STREQ (".text", exec_ops.to_sections[i].the_bfd_section->name)) |
| 618 | { |
| 619 | exec_ops.to_sections[i].addr += vmap->tstart - vmap->tvma; |
| 620 | exec_ops.to_sections[i].endaddr += vmap->tstart - vmap->tvma; |
| 621 | } |
| 622 | else if (STREQ (".data", exec_ops.to_sections[i].the_bfd_section->name)) |
| 623 | { |
| 624 | exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma; |
| 625 | exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma; |
| 626 | } |
| 627 | else if (STREQ (".bss", exec_ops.to_sections[i].the_bfd_section->name)) |
| 628 | { |
| 629 | exec_ops.to_sections[i].addr += vmap->dstart - vmap->dvma; |
| 630 | exec_ops.to_sections[i].endaddr += vmap->dstart - vmap->dvma; |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | \f |
| 635 | /* xcoff_relocate_symtab - hook for symbol table relocation. |
| 636 | also reads shared libraries.. */ |
| 637 | |
| 638 | void |
| 639 | xcoff_relocate_symtab (pid) |
| 640 | unsigned int pid; |
| 641 | { |
| 642 | #define MAX_LOAD_SEGS 64 /* maximum number of load segments */ |
| 643 | |
| 644 | struct ld_info *ldi; |
| 645 | |
| 646 | ldi = (void *) alloca (MAX_LOAD_SEGS * sizeof (*ldi)); |
| 647 | |
| 648 | /* According to my humble theory, AIX has some timing problems and |
| 649 | when the user stack grows, kernel doesn't update stack info in time |
| 650 | and ptrace calls step on user stack. That is why we sleep here a little, |
| 651 | and give kernel to update its internals. */ |
| 652 | |
| 653 | usleep (36000); |
| 654 | |
| 655 | errno = 0; |
| 656 | ptrace (PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi, |
| 657 | MAX_LOAD_SEGS * sizeof (*ldi), (int *) ldi); |
| 658 | if (errno) |
| 659 | perror_with_name ("ptrace ldinfo"); |
| 660 | |
| 661 | vmap_ldinfo (ldi); |
| 662 | |
| 663 | /* relocate the exec and core sections as well. */ |
| 664 | vmap_exec (); |
| 665 | } |
| 666 | \f |
| 667 | /* Core file stuff. */ |
| 668 | |
| 669 | /* Relocate symtabs and read in shared library info, based on symbols |
| 670 | from the core file. */ |
| 671 | |
| 672 | void |
| 673 | xcoff_relocate_core (target) |
| 674 | struct target_ops *target; |
| 675 | { |
| 676 | /* Offset of member MEMBER in a struct of type TYPE. */ |
| 677 | #ifndef offsetof |
| 678 | #define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER) |
| 679 | #endif |
| 680 | |
| 681 | /* Size of a struct ld_info except for the variable-length filename. */ |
| 682 | #define LDINFO_SIZE (offsetof (struct ld_info, ldinfo_filename)) |
| 683 | |
| 684 | sec_ptr ldinfo_sec; |
| 685 | int offset = 0; |
| 686 | struct ld_info *ldip; |
| 687 | struct vmap *vp; |
| 688 | |
| 689 | /* Allocated size of buffer. */ |
| 690 | int buffer_size = LDINFO_SIZE; |
| 691 | char *buffer = xmalloc (buffer_size); |
| 692 | struct cleanup *old = make_cleanup (free_current_contents, &buffer); |
| 693 | |
| 694 | /* FIXME, this restriction should not exist. For now, though I'll |
| 695 | avoid coredumps with error() pending a real fix. */ |
| 696 | if (vmap == NULL) |
| 697 | error |
| 698 | ("Can't debug a core file without an executable file (on the RS/6000)"); |
| 699 | |
| 700 | ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo"); |
| 701 | if (ldinfo_sec == NULL) |
| 702 | { |
| 703 | bfd_err: |
| 704 | fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n", |
| 705 | bfd_errmsg (bfd_get_error ())); |
| 706 | do_cleanups (old); |
| 707 | return; |
| 708 | } |
| 709 | do |
| 710 | { |
| 711 | int i; |
| 712 | int names_found = 0; |
| 713 | |
| 714 | /* Read in everything but the name. */ |
| 715 | if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer, |
| 716 | offset, LDINFO_SIZE) == 0) |
| 717 | goto bfd_err; |
| 718 | |
| 719 | /* Now the name. */ |
| 720 | i = LDINFO_SIZE; |
| 721 | do |
| 722 | { |
| 723 | if (i == buffer_size) |
| 724 | { |
| 725 | buffer_size *= 2; |
| 726 | buffer = xrealloc (buffer, buffer_size); |
| 727 | } |
| 728 | if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i], |
| 729 | offset + i, 1) == 0) |
| 730 | goto bfd_err; |
| 731 | if (buffer[i++] == '\0') |
| 732 | ++names_found; |
| 733 | } |
| 734 | while (names_found < 2); |
| 735 | |
| 736 | ldip = (struct ld_info *) buffer; |
| 737 | |
| 738 | /* Can't use a file descriptor from the core file; need to open it. */ |
| 739 | ldip->ldinfo_fd = -1; |
| 740 | |
| 741 | /* The first ldinfo is for the exec file, allocated elsewhere. */ |
| 742 | if (offset == 0) |
| 743 | vp = vmap; |
| 744 | else |
| 745 | vp = add_vmap (ldip); |
| 746 | |
| 747 | offset += ldip->ldinfo_next; |
| 748 | |
| 749 | /* We can assume pointer == CORE_ADDR, this code is native only. */ |
| 750 | vp->tstart = (CORE_ADDR) ldip->ldinfo_textorg; |
| 751 | vp->tend = vp->tstart + ldip->ldinfo_textsize; |
| 752 | vp->dstart = (CORE_ADDR) ldip->ldinfo_dataorg; |
| 753 | vp->dend = vp->dstart + ldip->ldinfo_datasize; |
| 754 | |
| 755 | /* The run time loader maps the file header in addition to the text |
| 756 | section and returns a pointer to the header in ldinfo_textorg. |
| 757 | Adjust the text start address to point to the real start address |
| 758 | of the text section. */ |
| 759 | vp->tstart += vp->toffs; |
| 760 | |
| 761 | /* Unless this is the exec file, |
| 762 | add our sections to the section table for the core target. */ |
| 763 | if (vp != vmap) |
| 764 | { |
| 765 | struct section_table *stp; |
| 766 | |
| 767 | target_resize_to_sections (target, 2); |
| 768 | stp = target->to_sections_end - 2; |
| 769 | |
| 770 | stp->bfd = vp->bfd; |
| 771 | stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text"); |
| 772 | stp->addr = vp->tstart; |
| 773 | stp->endaddr = vp->tend; |
| 774 | stp++; |
| 775 | |
| 776 | stp->bfd = vp->bfd; |
| 777 | stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data"); |
| 778 | stp->addr = vp->dstart; |
| 779 | stp->endaddr = vp->dend; |
| 780 | } |
| 781 | |
| 782 | vmap_symtab (vp); |
| 783 | } |
| 784 | while (ldip->ldinfo_next != 0); |
| 785 | vmap_exec (); |
| 786 | breakpoint_re_set (); |
| 787 | do_cleanups (old); |
| 788 | } |
| 789 | |
| 790 | int |
| 791 | kernel_u_size () |
| 792 | { |
| 793 | return (sizeof (struct user)); |
| 794 | } |
| 795 | \f |
| 796 | /* Under AIX, we have to pass the correct TOC pointer to a function |
| 797 | when calling functions in the inferior. |
| 798 | We try to find the relative toc offset of the objfile containing PC |
| 799 | and add the current load address of the data segment from the vmap. */ |
| 800 | |
| 801 | static CORE_ADDR |
| 802 | find_toc_address (pc) |
| 803 | CORE_ADDR pc; |
| 804 | { |
| 805 | struct vmap *vp; |
| 806 | |
| 807 | for (vp = vmap; vp; vp = vp->nxt) |
| 808 | { |
| 809 | if (pc >= vp->tstart && pc < vp->tend) |
| 810 | { |
| 811 | /* vp->objfile is only NULL for the exec file. */ |
| 812 | return vp->dstart + get_toc_offset (vp->objfile == NULL |
| 813 | ? symfile_objfile |
| 814 | : vp->objfile); |
| 815 | } |
| 816 | } |
| 817 | error ("Unable to find TOC entry for pc 0x%x\n", pc); |
| 818 | } |
| 819 | \f |
| 820 | /* Register that we are able to handle rs6000 core file formats. */ |
| 821 | |
| 822 | static struct core_fns rs6000_core_fns = |
| 823 | { |
| 824 | bfd_target_coff_flavour, /* core_flavour */ |
| 825 | default_check_format, /* check_format */ |
| 826 | default_core_sniffer, /* core_sniffer */ |
| 827 | fetch_core_registers, /* core_read_registers */ |
| 828 | NULL /* next */ |
| 829 | }; |
| 830 | |
| 831 | void |
| 832 | _initialize_core_rs6000 () |
| 833 | { |
| 834 | /* Initialize hook in rs6000-tdep.c for determining the TOC address when |
| 835 | calling functions in the inferior. */ |
| 836 | find_toc_address_hook = &find_toc_address; |
| 837 | |
| 838 | /* For native configurations, where this module is included, inform |
| 839 | the xcoffsolib module where it can find the function for symbol table |
| 840 | relocation at runtime. */ |
| 841 | xcoff_relocate_symtab_hook = &xcoff_relocate_symtab; |
| 842 | add_core_fns (&rs6000_core_fns); |
| 843 | } |