gdb/osfsolib.c

   1 /* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
   2    Copyright 1993, 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* FIXME: Most of this code could be merged with solib.c by using
  21    next_link_map_member and xfer_link_map_member in solib.c.  */
  22
  23 #include "defs.h"
  24
  25 #include <sys/types.h>
  26 #include <signal.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29
  30 #include "symtab.h"
  31 #include "bfd.h"
  32 #include "symfile.h"
  33 #include "objfiles.h"
  34 #include "gdbcore.h"
  35 #include "command.h"
  36 #include "target.h"
  37 #include "frame.h"
  38 #include "regex.h"
  39 #include "inferior.h"
  40 #include "language.h"
  41
  42 #define MAX_PATH_SIZE 256               /* FIXME: Should be dynamic */
  43
  44 /* FIXME: This is a terrible hack for shared library support under OSF/1.
  45    The main problem is that the needed definitions are not contained in
  46    the system header files.
  47    The ldr_* routines described in loader(3) would be the way to go here.
  48    But they do not work for arbitrary target processes (as documented).  */
  49
  50 #ifndef USE_LDR_ROUTINES
  51 #define RLD_CONTEXT_ADDRESS     0x3ffc0000000
  52
  53 typedef struct
  54 {
  55         CORE_ADDR next;
  56         CORE_ADDR previous;
  57         CORE_ADDR unknown;
  58         char *module_name;
  59         CORE_ADDR modinfo_addr;
  60 } ldr_module_info_t;
  61
  62 typedef struct
  63 {
  64         CORE_ADDR unknown1;
  65         CORE_ADDR unknown2;
  66         CORE_ADDR head;
  67         CORE_ADDR tail;
  68 } ldr_context_t;
  69
  70 static ldr_context_t ldr_context;
  71 #else
  72 #include <loader.h>
  73 #endif
  74
  75 /* Define our own link_map structure.
  76    This will help to share code with solib.c.  */
  77
  78 struct link_map {
  79   CORE_ADDR l_addr;                     /* address at which object mapped */
  80   char *l_name;                         /* full name of loaded object */
  81   ldr_module_info_t module_info;        /* corresponding module info */
  82 };
  83
  84 #define LM_ADDR(so) ((so) -> lm.l_addr)
  85 #define LM_NAME(so) ((so) -> lm.l_name)
  86
  87 struct so_list {
  88   struct so_list *next;                 /* next structure in linked list */
  89   struct link_map lm;                   /* copy of link map from inferior */
  90   struct link_map *lmaddr;              /* addr in inferior lm was read from */
  91   CORE_ADDR lmend;                      /* upper addr bound of mapped object */
  92   char so_name[MAX_PATH_SIZE];          /* shared object lib name (FIXME) */
  93   char symbols_loaded;                  /* flag: symbols read in yet? */
  94   char from_tty;                        /* flag: print msgs? */
  95   struct objfile *objfile;              /* objfile for loaded lib */
  96   struct section_table *sections;
  97   struct section_table *sections_end;
  98   struct section_table *textsection;
  99   bfd *abfd;
 100 };
 101
 102 static struct so_list *so_list_head;    /* List of known shared objects */
 103
 104 extern int
 105 fdmatch PARAMS ((int, int));            /* In libiberty */
 106
 107 /* Local function prototypes */
 108
 109 static void
 110 sharedlibrary_command PARAMS ((char *, int));
 111
 112 static void
 113 info_sharedlibrary_command PARAMS ((char *, int));
 114
 115 static int
 116 symbol_add_stub PARAMS ((char *));
 117
 118 static struct so_list *
 119 find_solib PARAMS ((struct so_list *));
 120
 121 static struct link_map *
 122 first_link_map_member PARAMS ((void));
 123
 124 static struct link_map *
 125 next_link_map_member PARAMS ((struct so_list *));
 126
 127 static void
 128 xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
 129
 130 static void
 131 solib_map_sections PARAMS ((struct so_list *));
 132
 133 /*
 134
 135 LOCAL FUNCTION
 136
 137         solib_map_sections -- open bfd and build sections for shared lib
 138
 139 SYNOPSIS
 140
 141         static void solib_map_sections (struct so_list *so)
 142
 143 DESCRIPTION
 144
 145         Given a pointer to one of the shared objects in our list
 146         of mapped objects, use the recorded name to open a bfd
 147         descriptor for the object, build a section table, and then
 148         relocate all the section addresses by the base address at
 149         which the shared object was mapped.
 150
 151 FIXMES
 152
 153         In most (all?) cases the shared object file name recorded in the
 154         dynamic linkage tables will be a fully qualified pathname.  For
 155         cases where it isn't, do we really mimic the systems search
 156         mechanism correctly in the below code (particularly the tilde
 157         expansion stuff?).
 158  */
 159
 160 static void
 161 solib_map_sections (so)
 162      struct so_list *so;
 163 {
 164   char *filename;
 165   char *scratch_pathname;
 166   int scratch_chan;
 167   struct section_table *p;
 168   struct cleanup *old_chain;
 169   bfd *abfd;
 170
 171   filename = tilde_expand (so -> so_name);
 172   old_chain = make_cleanup (free, filename);
 173
 174   scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
 175                         &scratch_pathname);
 176   if (scratch_chan < 0)
 177     {
 178       scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
 179                             O_RDONLY, 0, &scratch_pathname);
 180     }
 181   if (scratch_chan < 0)
 182     {
 183       perror_with_name (filename);
 184     }
 185   /* Leave scratch_pathname allocated.  bfd->name will point to it.  */
 186
 187   abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
 188   if (!abfd)
 189     {
 190       close (scratch_chan);
 191       error ("Could not open `%s' as an executable file: %s",
 192              scratch_pathname, bfd_errmsg (bfd_get_error ()));
 193     }
 194   /* Leave bfd open, core_xfer_memory and "info files" need it.  */
 195   so -> abfd = abfd;
 196   abfd -> cacheable = true;
 197
 198   if (!bfd_check_format (abfd, bfd_object))
 199     {
 200       error ("\"%s\": not in executable format: %s.",
 201              scratch_pathname, bfd_errmsg (bfd_get_error ()));
 202     }
 203   if (build_section_table (abfd, &so -> sections, &so -> sections_end))
 204     {
 205       error ("Can't find the file sections in `%s': %s",
 206              bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
 207     }
 208
 209   for (p = so -> sections; p < so -> sections_end; p++)
 210     {
 211       /* Relocate the section binding addresses as recorded in the shared
 212          object's file by the base address to which the object was actually
 213          mapped. */
 214       p -> addr += (CORE_ADDR) LM_ADDR (so);
 215       p -> endaddr += (CORE_ADDR) LM_ADDR (so);
 216       so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
 217       if (STREQ (p -> the_bfd_section -> name, ".text"))
 218         {
 219           so -> textsection = p;
 220         }
 221     }
 222
 223   /* Free the file names, close the file now.  */
 224   do_cleanups (old_chain);
 225 }
 226
 227 /*
 228
 229 LOCAL FUNCTION
 230
 231         first_link_map_member -- locate first member in dynamic linker's map
 232
 233 SYNOPSIS
 234
 235         static struct link_map *first_link_map_member (void)
 236
 237 DESCRIPTION
 238
 239         Read in a copy of the first member in the inferior's dynamic
 240         link map from the inferior's dynamic linker structures, and return
 241         a pointer to the copy in our address space.
 242 */
 243
 244 static struct link_map *
 245 first_link_map_member ()
 246 {
 247   struct link_map *lm = NULL;
 248   static struct link_map first_lm;
 249
 250 #ifdef USE_LDR_ROUTINES
 251   ldr_module_t mod_id = LDR_NULL_MODULE;
 252   size_t retsize;
 253
 254   if (ldr_next_module(inferior_pid, &mod_id) != 0
 255       || mod_id == LDR_NULL_MODULE
 256       || ldr_inq_module(inferior_pid, mod_id,
 257                         &first_lm.module_info, sizeof(ldr_module_info_t),
 258                         &retsize) != 0)
 259     return lm;
 260 #else
 261   CORE_ADDR ldr_context_addr;
 262
 263   if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
 264                           (char *) &ldr_context_addr,
 265                           sizeof (CORE_ADDR)) != 0
 266       || target_read_memory (ldr_context_addr,
 267                              (char *) &ldr_context,
 268                              sizeof (ldr_context_t)) != 0
 269       || target_read_memory ((CORE_ADDR) ldr_context.head,
 270                              (char *) &first_lm.module_info,
 271                              sizeof (ldr_module_info_t)) != 0)
 272     return lm;
 273 #endif
 274
 275   lm = &first_lm;
 276
 277   /* The first entry is for the main program and should be skipped.  */
 278   lm->l_name = NULL;
 279
 280   return lm;
 281 }
 282
 283 static struct link_map *
 284 next_link_map_member (so_list_ptr)
 285      struct so_list *so_list_ptr;
 286 {
 287   struct link_map *lm = NULL;
 288   static struct link_map next_lm;
 289 #ifdef USE_LDR_ROUTINES
 290   ldr_module_t mod_id = lm->module_info.lmi_modid;
 291   size_t retsize;
 292
 293   if (ldr_next_module(inferior_pid, &mod_id) != 0
 294       || mod_id == LDR_NULL_MODULE
 295       || ldr_inq_module(inferior_pid, mod_id,
 296                         &next_lm.module_info, sizeof(ldr_module_info_t),
 297                         &retsize) != 0)
 298     return lm;
 299
 300   lm = &next_lm;
 301   lm->l_name = lm->module_info.lmi_name;
 302 #else
 303   CORE_ADDR ldr_context_addr;
 304
 305   /* Reread context in case ldr_context.tail was updated.  */
 306
 307   if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
 308                           (char *) &ldr_context_addr,
 309                           sizeof (CORE_ADDR)) != 0
 310       || target_read_memory (ldr_context_addr,
 311                              (char *) &ldr_context,
 312                              sizeof (ldr_context_t)) != 0
 313       || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
 314       || target_read_memory (so_list_ptr->lm.module_info.next,
 315                              (char *) &next_lm.module_info,
 316                              sizeof (ldr_module_info_t)) != 0)
 317     return lm;
 318
 319   lm = &next_lm;
 320   lm->l_name = lm->module_info.module_name;
 321 #endif
 322   return lm;
 323 }
 324
 325 static void
 326 xfer_link_map_member (so_list_ptr, lm)
 327      struct so_list *so_list_ptr;
 328      struct link_map *lm;
 329 {
 330   so_list_ptr->lm = *lm;
 331
 332   /* OSF/1 has absolute addresses in shared libraries.  */
 333   LM_ADDR (so_list_ptr) = 0;
 334
 335   /* There is one entry that has no name (for the inferior executable)
 336      since it is not a shared object. */
 337   if (LM_NAME (so_list_ptr) != 0)
 338     {
 339
 340 #ifdef USE_LDR_ROUTINES
 341       int len = strlen (LM_NAME (so_list_ptr) + 1);
 342
 343       if (len > MAX_PATH_SIZE)
 344         len = MAX_PATH_SIZE;
 345       strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
 346 #else
 347       int errcode;
 348       char *buffer;
 349       target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
 350                           MAX_PATH_SIZE - 1, &errcode);
 351       if (errcode != 0)
 352         error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
 353                safe_strerror (errcode));
 354       strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
 355       free (buffer);
 356 #endif
 357       so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
 358
 359       solib_map_sections (so_list_ptr);
 360     }
 361 }
 362
 363 /*
 364
 365 LOCAL FUNCTION
 366
 367         find_solib -- step through list of shared objects
 368
 369 SYNOPSIS
 370
 371         struct so_list *find_solib (struct so_list *so_list_ptr)
 372
 373 DESCRIPTION
 374
 375         This module contains the routine which finds the names of any
 376         loaded "images" in the current process. The argument in must be
 377         NULL on the first call, and then the returned value must be passed
 378         in on subsequent calls. This provides the capability to "step" down
 379         the list of loaded objects. On the last object, a NULL value is
 380         returned.
 381
 382         The arg and return value are "struct link_map" pointers, as defined
 383         in <link.h>.
 384  */
 385
 386 static struct so_list *
 387 find_solib (so_list_ptr)
 388      struct so_list *so_list_ptr;       /* Last lm or NULL for first one */
 389 {
 390   struct so_list *so_list_next = NULL;
 391   struct link_map *lm = NULL;
 392   struct so_list *new;
 393
 394   if (so_list_ptr == NULL)
 395     {
 396       /* We are setting up for a new scan through the loaded images. */
 397       if ((so_list_next = so_list_head) == NULL)
 398         {
 399           /* Find the first link map list member. */
 400           lm = first_link_map_member ();
 401         }
 402     }
 403   else
 404     {
 405       /* We have been called before, and are in the process of walking
 406          the shared library list.  Advance to the next shared object. */
 407       lm = next_link_map_member (so_list_ptr);
 408       so_list_next = so_list_ptr -> next;
 409     }
 410   if ((so_list_next == NULL) && (lm != NULL))
 411     {
 412       /* Get next link map structure from inferior image and build a local
 413          abbreviated load_map structure */
 414       new = (struct so_list *) xmalloc (sizeof (struct so_list));
 415       memset ((char *) new, 0, sizeof (struct so_list));
 416       new -> lmaddr = lm;
 417       /* Add the new node as the next node in the list, or as the root
 418          node if this is the first one. */
 419       if (so_list_ptr != NULL)
 420         {
 421           so_list_ptr -> next = new;
 422         }
 423       else
 424         {
 425           so_list_head = new;
 426         }
 427       so_list_next = new;
 428       xfer_link_map_member (new, lm);
 429     }
 430   return (so_list_next);
 431 }
 432
 433 /* A small stub to get us past the arg-passing pinhole of catch_errors.  */
 434
 435 static int
 436 symbol_add_stub (arg)
 437      char *arg;
 438 {
 439   register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
 440
 441   so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
 442                                    so -> textsection -> addr,
 443                                    0, 0, 0);
 444   return (1);
 445 }
 446
 447 /*
 448
 449 GLOBAL FUNCTION
 450
 451         solib_add -- add a shared library file to the symtab and section list
 452
 453 SYNOPSIS
 454
 455         void solib_add (char *arg_string, int from_tty,
 456                         struct target_ops *target)
 457
 458 DESCRIPTION
 459
 460 */
 461
 462 void
 463 solib_add (arg_string, from_tty, target)
 464      char *arg_string;
 465      int from_tty;
 466      struct target_ops *target;
 467 {
 468   register struct so_list *so = NULL;           /* link map state variable */
 469
 470   /* Last shared library that we read.  */
 471   struct so_list *so_last = NULL;
 472
 473   char *re_err;
 474   int count;
 475   int old;
 476   int symbols_added = 0;
 477
 478   if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
 479     {
 480       error ("Invalid regexp: %s", re_err);
 481     }
 482
 483
 484   /* Add the shared library sections to the section table of the
 485      specified target, if any.  */
 486   if (target)
 487     {
 488       /* Count how many new section_table entries there are.  */
 489       so = NULL;
 490       count = 0;
 491       while ((so = find_solib (so)) != NULL)
 492         {
 493           if (so -> so_name[0])
 494             {
 495               count += so -> sections_end - so -> sections;
 496             }
 497         }
 498
 499       if (count)
 500         {
 501           /* Reallocate the target's section table including the new size.  */
 502           if (target -> to_sections)
 503             {
 504               old = target -> to_sections_end - target -> to_sections;
 505               target -> to_sections = (struct section_table *)
 506                 xrealloc ((char *)target -> to_sections,
 507                          (sizeof (struct section_table)) * (count + old));
 508             }
 509           else
 510             {
 511               old = 0;
 512               target -> to_sections = (struct section_table *)
 513                 xmalloc ((sizeof (struct section_table)) * count);
 514             }
 515           target -> to_sections_end = target -> to_sections + (count + old);
 516
 517           /* Add these section table entries to the target's table.  */
 518           while ((so = find_solib (so)) != NULL)
 519             {
 520               if (so -> so_name[0])
 521                 {
 522                   count = so -> sections_end - so -> sections;
 523                   memcpy ((char *) (target -> to_sections + old),
 524                           so -> sections,
 525                           (sizeof (struct section_table)) * count);
 526                   old += count;
 527                 }
 528             }
 529         }
 530     }
 531
 532   /* Now add the symbol files.  */
 533   so = NULL;
 534   while ((so = find_solib (so)) != NULL)
 535     {
 536       if (so -> so_name[0] && re_exec (so -> so_name))
 537         {
 538           so -> from_tty = from_tty;
 539           if (so -> symbols_loaded)
 540             {
 541               if (from_tty)
 542                 {
 543                   printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
 544                 }
 545             }
 546           else if (catch_errors
 547                    (symbol_add_stub, (char *) so,
 548                     "Error while reading shared library symbols:\n",
 549                     RETURN_MASK_ALL))
 550             {
 551               so_last = so;
 552               so -> symbols_loaded = 1;
 553               symbols_added = 1;
 554             }
 555         }
 556     }
 557
 558   /* Getting new symbols may change our opinion about what is
 559      frameless.  */
 560   if (symbols_added)
 561     reinit_frame_cache ();
 562 }
 563
 564 /*
 565
 566 LOCAL FUNCTION
 567
 568         info_sharedlibrary_command -- code for "info sharedlibrary"
 569
 570 SYNOPSIS
 571
 572         static void info_sharedlibrary_command ()
 573
 574 DESCRIPTION
 575
 576         Walk through the shared library list and print information
 577         about each attached library.
 578 */
 579
 580 static void
 581 info_sharedlibrary_command (ignore, from_tty)
 582      char *ignore;
 583      int from_tty;
 584 {
 585   register struct so_list *so = NULL;   /* link map state variable */
 586   int header_done = 0;
 587
 588   if (exec_bfd == NULL)
 589     {
 590       printf_unfiltered ("No exec file.\n");
 591       return;
 592     }
 593   while ((so = find_solib (so)) != NULL)
 594     {
 595       if (so -> so_name[0])
 596         {
 597           unsigned long txt_start = 0;
 598           unsigned long txt_end = 0;
 599
 600           if (!header_done)
 601             {
 602               printf_unfiltered("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
 603                      "Shared Object Library");
 604               header_done++;
 605             }
 606           if (so -> textsection)
 607             {
 608               txt_start = (unsigned long) so -> textsection -> addr;
 609               txt_end = (unsigned long) so -> textsection -> endaddr;
 610             }
 611           printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
 612           printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
 613           printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
 614           printf_unfiltered ("%s\n",  so -> so_name);
 615         }
 616     }
 617   if (so_list_head == NULL)
 618     {
 619       printf_unfiltered ("No shared libraries loaded at this time.\n");
 620     }
 621 }
 622
 623 /*
 624
 625 GLOBAL FUNCTION
 626
 627         solib_address -- check to see if an address is in a shared lib
 628
 629 SYNOPSIS
 630
 631         int solib_address (CORE_ADDR address)
 632
 633 DESCRIPTION
 634
 635         Provides a hook for other gdb routines to discover whether or
 636         not a particular address is within the mapped address space of
 637         a shared library.  Any address between the base mapping address
 638         and the first address beyond the end of the last mapping, is
 639         considered to be within the shared library address space, for
 640         our purposes.
 641
 642         For example, this routine is called at one point to disable
 643         breakpoints which are in shared libraries that are not currently
 644         mapped in.
 645  */
 646
 647 int
 648 solib_address (address)
 649      CORE_ADDR address;
 650 {
 651   register struct so_list *so = 0;      /* link map state variable */
 652
 653   while ((so = find_solib (so)) != NULL)
 654     {
 655       if (so -> so_name[0] && so -> textsection)
 656         {
 657           if ((address >= (CORE_ADDR) so -> textsection -> addr) &&
 658               (address < (CORE_ADDR) so -> textsection -> endaddr))
 659             {
 660               return (1);
 661             }
 662         }
 663     }
 664   return (0);
 665 }
 666
 667 /* Called by free_all_symtabs */
 668
 669 void
 670 clear_solib()
 671 {
 672   struct so_list *next;
 673   char *bfd_filename;
 674
 675   while (so_list_head)
 676     {
 677       if (so_list_head -> sections)
 678         {
 679           free ((PTR)so_list_head -> sections);
 680         }
 681       if (so_list_head -> abfd)
 682         {
 683           bfd_filename = bfd_get_filename (so_list_head -> abfd);
 684           bfd_close (so_list_head -> abfd);
 685         }
 686       else
 687         /* This happens for the executable on SVR4.  */
 688         bfd_filename = NULL;
 689
 690       next = so_list_head -> next;
 691       if (bfd_filename)
 692         free ((PTR)bfd_filename);
 693       free ((PTR)so_list_head);
 694       so_list_head = next;
 695     }
 696 }
 697
 698 /*
 699
 700 GLOBAL FUNCTION
 701
 702         solib_create_inferior_hook -- shared library startup support
 703
 704 SYNOPSIS
 705
 706         void solib_create_inferior_hook()
 707
 708 DESCRIPTION
 709
 710         When gdb starts up the inferior, it nurses it along (through the
 711         shell) until it is ready to execute it's first instruction.  At this
 712         point, this function gets called via expansion of the macro
 713         SOLIB_CREATE_INFERIOR_HOOK.
 714         For a statically bound executable, this first instruction is the
 715         one at "_start", or a similar text label. No further processing is
 716         needed in that case.
 717         For a dynamically bound executable, this first instruction is somewhere
 718         in the rld, and the actual user executable is not yet mapped in.
 719         We continue the inferior again, rld then maps in the actual user
 720         executable and any needed shared libraries and then sends
 721         itself a SIGTRAP.
 722         At that point we discover the names of all shared libraries and
 723         read their symbols in.
 724
 725 FIXME
 726
 727         This code does not properly handle hitting breakpoints which the
 728         user might have set in the rld itself.  Proper handling would have
 729         to check if the SIGTRAP happened due to a kill call.
 730
 731         Also, what if child has exit()ed?  Must exit loop somehow.
 732   */
 733
 734 void
 735 solib_create_inferior_hook()
 736 {
 737
 738   /* Nothing to do for statically bound executables.  */
 739
 740   if (symfile_objfile == NULL
 741       || symfile_objfile->obfd == NULL
 742       || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
 743     return;
 744
 745   /* Now run the target.  It will eventually get a SIGTRAP, at
 746      which point all of the libraries will have been mapped in and we
 747      can go groveling around in the rld structures to find
 748      out what we need to know about them. */
 749
 750   clear_proceed_status ();
 751   stop_soon_quietly = 1;
 752   stop_signal = TARGET_SIGNAL_0;
 753   do
 754     {
 755       target_resume (-1, 0, stop_signal);
 756       wait_for_inferior ();
 757     }
 758   while (stop_signal != TARGET_SIGNAL_TRAP);
 759
 760   /*  solib_add will call reinit_frame_cache.
 761       But we are stopped in the runtime loader and we do not have symbols
 762       for the runtime loader. So heuristic_proc_start will be called
 763       and will put out an annoying warning.
 764       Delaying the resetting of stop_soon_quietly until after symbol loading
 765       suppresses the warning.  */
 766   solib_add ((char *) 0, 0, (struct target_ops *) 0);
 767   stop_soon_quietly = 0;
 768 }
 769
 770
 771 /*
 772
 773 LOCAL FUNCTION
 774
 775         sharedlibrary_command -- handle command to explicitly add library
 776
 777 SYNOPSIS
 778
 779         static void sharedlibrary_command (char *args, int from_tty)
 780
 781 DESCRIPTION
 782
 783 */
 784
 785 static void
 786 sharedlibrary_command (args, from_tty)
 787 char *args;
 788 int from_tty;
 789 {
 790   dont_repeat ();
 791   solib_add (args, from_tty, (struct target_ops *) 0);
 792 }
 793
 794 void
 795 _initialize_solib()
 796 {
 797
 798   add_com ("sharedlibrary", class_files, sharedlibrary_command,
 799            "Load shared object library symbols for files matching REGEXP.");
 800   add_info ("sharedlibrary", info_sharedlibrary_command,
 801             "Status of loaded shared object libraries.");
 802 }