gdb/osfsolib.c

   1 /* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
   2    Copyright 1993, 1994, 1995, 1996, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "gdb_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 "gnu-regex.h"
  39 #include "inferior.h"
  40 #include "language.h"
  41 #include "gdbcmd.h"
  42
  43 #define MAX_PATH_SIZE 1024              /* FIXME: Should be dynamic */
  44
  45 /* When handling shared libraries, GDB has to find out the pathnames
  46    of all shared libraries that are currently loaded (to read in their
  47    symbols) and where the shared libraries are loaded in memory
  48    (to relocate them properly from their prelinked addresses to the
  49    current load address).
  50
  51    Under OSF/1 there are two possibilities to get at this information:
  52    1) Peek around in the runtime loader structures.
  53       These are not documented, and they are not defined in the system
  54       header files. The definitions below were obtained by experimentation,
  55       but they seem stable enough.
  56    2) Use the undocumented libxproc.a library, which contains the
  57       equivalent ldr_* routines.
  58       This approach is somewhat cleaner, but it requires that the GDB
  59       executable is dynamically linked. In addition it requires a
  60       NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context
  61       linker specification for GDB and all applications that are using
  62       libgdb.
  63    We will use the peeking approach until it becomes unwieldy.  */
  64
  65 #ifndef USE_LDR_ROUTINES
  66
  67 /* Definition of runtime loader structures, found by experimentation.  */
  68 #define RLD_CONTEXT_ADDRESS     0x3ffc0000000
  69
  70 typedef struct
  71 {
  72         CORE_ADDR next;
  73         CORE_ADDR previous;
  74         CORE_ADDR unknown1;
  75         char *module_name;
  76         CORE_ADDR modinfo_addr;
  77         long module_id;
  78         CORE_ADDR unknown2;
  79         CORE_ADDR unknown3;
  80         long region_count;
  81         CORE_ADDR regioninfo_addr;
  82 } ldr_module_info_t;
  83
  84 typedef struct
  85 {
  86         long unknown1;
  87         CORE_ADDR regionname_addr;
  88         long protection;
  89         CORE_ADDR vaddr;
  90         CORE_ADDR mapaddr;
  91         long size;
  92         long unknown2[5];
  93 } ldr_region_info_t;
  94
  95 typedef struct
  96 {
  97         CORE_ADDR unknown1;
  98         CORE_ADDR unknown2;
  99         CORE_ADDR head;
 100         CORE_ADDR tail;
 101 } ldr_context_t;
 102
 103 static ldr_context_t ldr_context;
 104
 105 #else
 106
 107 #include <loader.h>
 108 static ldr_process_t fake_ldr_process;
 109
 110 /* Called by ldr_* routines to read memory from the current target.  */
 111
 112 static int ldr_read_memory PARAMS ((CORE_ADDR, char *, int, int));
 113
 114 static int
 115 ldr_read_memory (memaddr, myaddr, len, readstring)
 116      CORE_ADDR memaddr;
 117      char *myaddr;
 118      int len;
 119      int readstring;
 120 {
 121   int result;
 122   char *buffer;
 123
 124   if (readstring)
 125     {
 126       target_read_string (memaddr, &buffer, len, &result);
 127       if (result == 0)
 128         strcpy (myaddr, buffer);
 129       free (buffer);
 130     }
 131   else
 132     result = target_read_memory (memaddr, myaddr, len);
 133
 134   if (result != 0)
 135     result = -result;
 136   return result;
 137 }
 138
 139 #endif
 140
 141 /* Define our own link_map structure.
 142    This will help to share code with solib.c.  */
 143
 144 struct link_map {
 145   CORE_ADDR l_offset;                   /* prelink to load address offset */
 146   char *l_name;                         /* full name of loaded object */
 147   ldr_module_info_t module_info;        /* corresponding module info */
 148 };
 149
 150 #define LM_OFFSET(so) ((so) -> lm.l_offset)
 151 #define LM_NAME(so) ((so) -> lm.l_name)
 152
 153 struct so_list {
 154   struct so_list *next;                 /* next structure in linked list */
 155   struct link_map lm;                   /* copy of link map from inferior */
 156   struct link_map *lmaddr;              /* addr in inferior lm was read from */
 157   CORE_ADDR lmend;                      /* upper addr bound of mapped object */
 158   char so_name[MAX_PATH_SIZE];          /* shared object lib name (FIXME) */
 159   char symbols_loaded;                  /* flag: symbols read in yet? */
 160   char from_tty;                        /* flag: print msgs? */
 161   struct objfile *objfile;              /* objfile for loaded lib */
 162   struct section_table *sections;
 163   struct section_table *sections_end;
 164   struct section_table *textsection;
 165   bfd *abfd;
 166 };
 167
 168 static struct so_list *so_list_head;    /* List of known shared objects */
 169
 170 extern int
 171 fdmatch PARAMS ((int, int));            /* In libiberty */
 172
 173 /* Local function prototypes */
 174
 175 static void
 176 sharedlibrary_command PARAMS ((char *, int));
 177
 178 static void
 179 info_sharedlibrary_command PARAMS ((char *, int));
 180
 181 static int
 182 symbol_add_stub PARAMS ((char *));
 183
 184 static struct so_list *
 185 find_solib PARAMS ((struct so_list *));
 186
 187 static struct link_map *
 188 first_link_map_member PARAMS ((void));
 189
 190 static struct link_map *
 191 next_link_map_member PARAMS ((struct so_list *));
 192
 193 static void
 194 xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
 195
 196 static int
 197 solib_map_sections PARAMS ((char *));
 198
 199 /*
 200
 201 LOCAL FUNCTION
 202
 203         solib_map_sections -- open bfd and build sections for shared lib
 204
 205 SYNOPSIS
 206
 207         static int solib_map_sections (struct so_list *so)
 208
 209 DESCRIPTION
 210
 211         Given a pointer to one of the shared objects in our list
 212         of mapped objects, use the recorded name to open a bfd
 213         descriptor for the object, build a section table, and then
 214         relocate all the section addresses by the base address at
 215         which the shared object was mapped.
 216
 217 FIXMES
 218
 219         In most (all?) cases the shared object file name recorded in the
 220         dynamic linkage tables will be a fully qualified pathname.  For
 221         cases where it isn't, do we really mimic the systems search
 222         mechanism correctly in the below code (particularly the tilde
 223         expansion stuff?).
 224  */
 225
 226 static int
 227 solib_map_sections (arg)
 228      char *arg;
 229 {
 230   struct so_list *so = (struct so_list *) arg;  /* catch_errors bogon */
 231   char *filename;
 232   char *scratch_pathname;
 233   int scratch_chan;
 234   struct section_table *p;
 235   struct cleanup *old_chain;
 236   bfd *abfd;
 237
 238   filename = tilde_expand (so -> so_name);
 239   old_chain = make_cleanup (free, filename);
 240
 241   scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
 242                         &scratch_pathname);
 243   if (scratch_chan < 0)
 244     {
 245       scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
 246                             O_RDONLY, 0, &scratch_pathname);
 247     }
 248   if (scratch_chan < 0)
 249     {
 250       perror_with_name (filename);
 251     }
 252   /* Leave scratch_pathname allocated.  bfd->name will point to it.  */
 253
 254   abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
 255   if (!abfd)
 256     {
 257       close (scratch_chan);
 258       error ("Could not open `%s' as an executable file: %s",
 259              scratch_pathname, bfd_errmsg (bfd_get_error ()));
 260     }
 261   /* Leave bfd open, core_xfer_memory and "info files" need it.  */
 262   so -> abfd = abfd;
 263   abfd -> cacheable = true;
 264
 265   if (!bfd_check_format (abfd, bfd_object))
 266     {
 267       error ("\"%s\": not in executable format: %s.",
 268              scratch_pathname, bfd_errmsg (bfd_get_error ()));
 269     }
 270   if (build_section_table (abfd, &so -> sections, &so -> sections_end))
 271     {
 272       error ("Can't find the file sections in `%s': %s",
 273              bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
 274     }
 275
 276   for (p = so -> sections; p < so -> sections_end; p++)
 277     {
 278       /* Relocate the section binding addresses as recorded in the shared
 279          object's file by the offset to get the address to which the
 280          object was actually mapped.  */
 281       p -> addr += LM_OFFSET (so);
 282       p -> endaddr += LM_OFFSET (so);
 283       so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
 284       if (STREQ (p -> the_bfd_section -> name, ".text"))
 285         {
 286           so -> textsection = p;
 287         }
 288     }
 289
 290   /* Free the file names, close the file now.  */
 291   do_cleanups (old_chain);
 292
 293   return (1);
 294 }
 295
 296 /*
 297
 298 LOCAL FUNCTION
 299
 300         first_link_map_member -- locate first member in dynamic linker's map
 301
 302 SYNOPSIS
 303
 304         static struct link_map *first_link_map_member (void)
 305
 306 DESCRIPTION
 307
 308         Read in a copy of the first member in the inferior's dynamic
 309         link map from the inferior's dynamic linker structures, and return
 310         a pointer to the copy in our address space.
 311 */
 312
 313 static struct link_map *
 314 first_link_map_member ()
 315 {
 316   struct link_map *lm = NULL;
 317   static struct link_map first_lm;
 318
 319 #ifdef USE_LDR_ROUTINES
 320   ldr_module_t mod_id = LDR_NULL_MODULE;
 321   size_t retsize;
 322
 323   fake_ldr_process = ldr_core_process ();
 324   ldr_set_core_reader (ldr_read_memory);
 325   ldr_xdetach (fake_ldr_process);
 326   if (ldr_xattach (fake_ldr_process) != 0
 327       || ldr_next_module(fake_ldr_process, &mod_id) != 0
 328       || mod_id == LDR_NULL_MODULE
 329       || ldr_inq_module(fake_ldr_process, mod_id,
 330                         &first_lm.module_info, sizeof(ldr_module_info_t),
 331                         &retsize) != 0)
 332     return lm;
 333 #else
 334   CORE_ADDR ldr_context_addr;
 335
 336   if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
 337                           (char *) &ldr_context_addr,
 338                           sizeof (CORE_ADDR)) != 0
 339       || target_read_memory (ldr_context_addr,
 340                              (char *) &ldr_context,
 341                              sizeof (ldr_context_t)) != 0
 342       || target_read_memory ((CORE_ADDR) ldr_context.head,
 343                              (char *) &first_lm.module_info,
 344                              sizeof (ldr_module_info_t)) != 0)
 345     return lm;
 346 #endif
 347
 348   lm = &first_lm;
 349
 350   /* The first entry is for the main program and should be skipped.  */
 351   lm->l_name = NULL;
 352
 353   return lm;
 354 }
 355
 356 static struct link_map *
 357 next_link_map_member (so_list_ptr)
 358      struct so_list *so_list_ptr;
 359 {
 360   struct link_map *lm = NULL;
 361   static struct link_map next_lm;
 362 #ifdef USE_LDR_ROUTINES
 363   ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid;
 364   size_t retsize;
 365
 366   if (ldr_next_module(fake_ldr_process, &mod_id) != 0
 367       || mod_id == LDR_NULL_MODULE
 368       || ldr_inq_module(fake_ldr_process, mod_id,
 369                         &next_lm.module_info, sizeof(ldr_module_info_t),
 370                         &retsize) != 0)
 371     return lm;
 372
 373   lm = &next_lm;
 374   lm->l_name = lm->module_info.lmi_name;
 375 #else
 376   CORE_ADDR ldr_context_addr;
 377
 378   /* Reread context in case ldr_context.tail was updated.  */
 379
 380   if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
 381                           (char *) &ldr_context_addr,
 382                           sizeof (CORE_ADDR)) != 0
 383       || target_read_memory (ldr_context_addr,
 384                              (char *) &ldr_context,
 385                              sizeof (ldr_context_t)) != 0
 386       || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
 387       || target_read_memory (so_list_ptr->lm.module_info.next,
 388                              (char *) &next_lm.module_info,
 389                              sizeof (ldr_module_info_t)) != 0)
 390     return lm;
 391
 392   lm = &next_lm;
 393   lm->l_name = lm->module_info.module_name;
 394 #endif
 395   return lm;
 396 }
 397
 398 static void
 399 xfer_link_map_member (so_list_ptr, lm)
 400      struct so_list *so_list_ptr;
 401      struct link_map *lm;
 402 {
 403   int i;
 404   so_list_ptr->lm = *lm;
 405
 406   /* OSF/1 shared libraries are pre-linked to particular addresses,
 407      but the runtime loader may have to relocate them if the
 408      address ranges of the libraries used by the target executable clash,
 409      or if the target executable is linked with the -taso option.
 410      The offset is the difference between the address where the shared
 411      library is mapped and the pre-linked address of the shared library.
 412
 413      FIXME:  GDB is currently unable to relocate the shared library
 414      sections by different offsets. If sections are relocated by
 415      different offsets, put out a warning and use the offset of the
 416      first section for all remaining sections.  */
 417   LM_OFFSET (so_list_ptr) = 0;
 418
 419   /* There is one entry that has no name (for the inferior executable)
 420      since it is not a shared object. */
 421   if (LM_NAME (so_list_ptr) != 0)
 422     {
 423
 424 #ifdef USE_LDR_ROUTINES
 425       int len = strlen (LM_NAME (so_list_ptr) + 1);
 426
 427       if (len > MAX_PATH_SIZE)
 428         len = MAX_PATH_SIZE;
 429       strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
 430       so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
 431
 432       for (i = 0; i < lm->module_info.lmi_nregion; i++)
 433         {
 434           ldr_region_info_t region_info;
 435           size_t retsize;
 436           CORE_ADDR region_offset;
 437
 438           if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid,
 439                               i, &region_info, sizeof (region_info),
 440                               &retsize) != 0)
 441             break;
 442           region_offset = (CORE_ADDR) region_info.lri_mapaddr
 443                           - (CORE_ADDR) region_info.lri_vaddr;
 444           if (i == 0)
 445             LM_OFFSET (so_list_ptr) = region_offset;
 446           else if (LM_OFFSET (so_list_ptr) != region_offset)
 447             warning ("cannot handle shared library relocation for %s (%s)",
 448                      so_list_ptr->so_name, region_info.lri_name);
 449         }
 450 #else
 451       int errcode;
 452       char *buffer;
 453       target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
 454                           MAX_PATH_SIZE - 1, &errcode);
 455       if (errcode != 0)
 456         error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
 457                safe_strerror (errcode));
 458       strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
 459       free (buffer);
 460       so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
 461
 462       for (i = 0; i < lm->module_info.region_count; i++)
 463         {
 464           ldr_region_info_t region_info;
 465           CORE_ADDR region_offset;
 466
 467           if (target_read_memory (lm->module_info.regioninfo_addr
 468                                    + i * sizeof (region_info),
 469                                   (char *) &region_info,
 470                                   sizeof (region_info)) != 0)
 471             break;
 472           region_offset = region_info.mapaddr - region_info.vaddr;
 473           if (i == 0)
 474             LM_OFFSET (so_list_ptr) = region_offset;
 475           else if (LM_OFFSET (so_list_ptr) != region_offset)
 476             {
 477               char *region_name;
 478               target_read_string (region_info.regionname_addr, &buffer,
 479                                   MAX_PATH_SIZE - 1, &errcode);
 480               if (errcode == 0)
 481                 region_name = buffer;
 482               else
 483                 region_name = "??";
 484               warning ("cannot handle shared library relocation for %s (%s)",
 485                         so_list_ptr->so_name, region_name);
 486               free (buffer);
 487             }
 488         }
 489 #endif
 490
 491       catch_errors (solib_map_sections, (char *) so_list_ptr,
 492                     "Error while mapping shared library sections:\n",
 493                     RETURN_MASK_ALL);
 494     }
 495 }
 496
 497 /*
 498
 499 LOCAL FUNCTION
 500
 501         find_solib -- step through list of shared objects
 502
 503 SYNOPSIS
 504
 505         struct so_list *find_solib (struct so_list *so_list_ptr)
 506
 507 DESCRIPTION
 508
 509         This module contains the routine which finds the names of any
 510         loaded "images" in the current process. The argument in must be
 511         NULL on the first call, and then the returned value must be passed
 512         in on subsequent calls. This provides the capability to "step" down
 513         the list of loaded objects. On the last object, a NULL value is
 514         returned.
 515
 516         The arg and return value are "struct link_map" pointers, as defined
 517         in <link.h>.
 518  */
 519
 520 static struct so_list *
 521 find_solib (so_list_ptr)
 522      struct so_list *so_list_ptr;       /* Last lm or NULL for first one */
 523 {
 524   struct so_list *so_list_next = NULL;
 525   struct link_map *lm = NULL;
 526   struct so_list *new;
 527
 528   if (so_list_ptr == NULL)
 529     {
 530       /* We are setting up for a new scan through the loaded images. */
 531       if ((so_list_next = so_list_head) == NULL)
 532         {
 533           /* Find the first link map list member. */
 534           lm = first_link_map_member ();
 535         }
 536     }
 537   else
 538     {
 539       /* We have been called before, and are in the process of walking
 540          the shared library list.  Advance to the next shared object. */
 541       lm = next_link_map_member (so_list_ptr);
 542       so_list_next = so_list_ptr -> next;
 543     }
 544   if ((so_list_next == NULL) && (lm != NULL))
 545     {
 546       /* Get next link map structure from inferior image and build a local
 547          abbreviated load_map structure */
 548       new = (struct so_list *) xmalloc (sizeof (struct so_list));
 549       memset ((char *) new, 0, sizeof (struct so_list));
 550       new -> lmaddr = lm;
 551       /* Add the new node as the next node in the list, or as the root
 552          node if this is the first one. */
 553       if (so_list_ptr != NULL)
 554         {
 555           so_list_ptr -> next = new;
 556         }
 557       else
 558         {
 559           so_list_head = new;
 560         }
 561       so_list_next = new;
 562       xfer_link_map_member (new, lm);
 563     }
 564   return (so_list_next);
 565 }
 566
 567 /* A small stub to get us past the arg-passing pinhole of catch_errors.  */
 568
 569 static int
 570 symbol_add_stub (arg)
 571      char *arg;
 572 {
 573   register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
 574   CORE_ADDR text_addr = 0;
 575
 576   if (so -> textsection)
 577     text_addr = so -> textsection -> addr;
 578   else if (so -> abfd != NULL)
 579     {
 580       asection *lowest_sect;
 581
 582       /* If we didn't find a mapped non zero sized .text section, set up
 583          text_addr so that the relocation in symbol_file_add does no harm.  */
 584
 585       lowest_sect = bfd_get_section_by_name (so -> abfd, ".text");
 586       if (lowest_sect == NULL)
 587         bfd_map_over_sections (so -> abfd, find_lowest_section,
 588                                (PTR) &lowest_sect);
 589       if (lowest_sect)
 590         text_addr = bfd_section_vma (so -> abfd, lowest_sect) + LM_OFFSET (so);
 591     }
 592
 593   so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
 594                                    text_addr,
 595                                    0, 0, 0);
 596   return (1);
 597 }
 598
 599 /*
 600
 601 GLOBAL FUNCTION
 602
 603         solib_add -- add a shared library file to the symtab and section list
 604
 605 SYNOPSIS
 606
 607         void solib_add (char *arg_string, int from_tty,
 608                         struct target_ops *target)
 609
 610 DESCRIPTION
 611
 612 */
 613
 614 void
 615 solib_add (arg_string, from_tty, target)
 616      char *arg_string;
 617      int from_tty;
 618      struct target_ops *target;
 619 {
 620   register struct so_list *so = NULL;           /* link map state variable */
 621
 622   /* Last shared library that we read.  */
 623   struct so_list *so_last = NULL;
 624
 625   char *re_err;
 626   int count;
 627   int old;
 628
 629   if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
 630     {
 631       error ("Invalid regexp: %s", re_err);
 632     }
 633
 634
 635   /* Add the shared library sections to the section table of the
 636      specified target, if any.  */
 637   if (target)
 638     {
 639       /* Count how many new section_table entries there are.  */
 640       so = NULL;
 641       count = 0;
 642       while ((so = find_solib (so)) != NULL)
 643         {
 644           if (so -> so_name[0])
 645             {
 646               count += so -> sections_end - so -> sections;
 647             }
 648         }
 649
 650       if (count)
 651         {
 652           int update_coreops;
 653
 654           /* We must update the to_sections field in the core_ops structure
 655              here, otherwise we dereference a potential dangling pointer
 656              for each call to target_read/write_memory within this routine.  */
 657           update_coreops = core_ops.to_sections == target->to_sections;
 658
 659           /* Reallocate the target's section table including the new size.  */
 660           if (target -> to_sections)
 661             {
 662               old = target -> to_sections_end - target -> to_sections;
 663               target -> to_sections = (struct section_table *)
 664                 xrealloc ((char *)target -> to_sections,
 665                          (sizeof (struct section_table)) * (count + old));
 666             }
 667           else
 668             {
 669               old = 0;
 670               target -> to_sections = (struct section_table *)
 671                 xmalloc ((sizeof (struct section_table)) * count);
 672             }
 673           target -> to_sections_end = target -> to_sections + (count + old);
 674
 675           /* Update the to_sections field in the core_ops structure
 676              if needed.  */
 677           if (update_coreops)
 678             {
 679               core_ops.to_sections = target->to_sections;
 680               core_ops.to_sections_end = target->to_sections_end;
 681             }
 682
 683           /* Add these section table entries to the target's table.  */
 684           while ((so = find_solib (so)) != NULL)
 685             {
 686               if (so -> so_name[0])
 687                 {
 688                   count = so -> sections_end - so -> sections;
 689                   memcpy ((char *) (target -> to_sections + old),
 690                           so -> sections,
 691                           (sizeof (struct section_table)) * count);
 692                   old += count;
 693                 }
 694             }
 695         }
 696     }
 697
 698   /* Now add the symbol files.  */
 699   so = NULL;
 700   while ((so = find_solib (so)) != NULL)
 701     {
 702       if (so -> so_name[0] && re_exec (so -> so_name))
 703         {
 704           so -> from_tty = from_tty;
 705           if (so -> symbols_loaded)
 706             {
 707               if (from_tty)
 708                 {
 709                   printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
 710                 }
 711             }
 712           else if (catch_errors
 713                    (symbol_add_stub, (char *) so,
 714                     "Error while reading shared library symbols:\n",
 715                     RETURN_MASK_ALL))
 716             {
 717               so_last = so;
 718               so -> symbols_loaded = 1;
 719             }
 720         }
 721     }
 722
 723   /* Getting new symbols may change our opinion about what is
 724      frameless.  */
 725   if (so_last)
 726     reinit_frame_cache ();
 727 }
 728
 729 /*
 730
 731 LOCAL FUNCTION
 732
 733         info_sharedlibrary_command -- code for "info sharedlibrary"
 734
 735 SYNOPSIS
 736
 737         static void info_sharedlibrary_command ()
 738
 739 DESCRIPTION
 740
 741         Walk through the shared library list and print information
 742         about each attached library.
 743 */
 744
 745 static void
 746 info_sharedlibrary_command (ignore, from_tty)
 747      char *ignore;
 748      int from_tty;
 749 {
 750   register struct so_list *so = NULL;   /* link map state variable */
 751   int header_done = 0;
 752
 753   if (exec_bfd == NULL)
 754     {
 755       printf_unfiltered ("No exec file.\n");
 756       return;
 757     }
 758   while ((so = find_solib (so)) != NULL)
 759     {
 760       if (so -> so_name[0])
 761         {
 762           unsigned long txt_start = 0;
 763           unsigned long txt_end = 0;
 764
 765           if (!header_done)
 766             {
 767               printf_unfiltered("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
 768                      "Shared Object Library");
 769               header_done++;
 770             }
 771           if (so -> textsection)
 772             {
 773               txt_start = (unsigned long) so -> textsection -> addr;
 774               txt_end = (unsigned long) so -> textsection -> endaddr;
 775             }
 776           printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
 777           printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
 778           printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
 779           printf_unfiltered ("%s\n",  so -> so_name);
 780         }
 781     }
 782   if (so_list_head == NULL)
 783     {
 784       printf_unfiltered ("No shared libraries loaded at this time.\n");
 785     }
 786 }
 787
 788 /*
 789
 790 GLOBAL FUNCTION
 791
 792         solib_address -- check to see if an address is in a shared lib
 793
 794 SYNOPSIS
 795
 796         char *solib_address (CORE_ADDR address)
 797
 798 DESCRIPTION
 799
 800         Provides a hook for other gdb routines to discover whether or
 801         not a particular address is within the mapped address space of
 802         a shared library.  Any address between the base mapping address
 803         and the first address beyond the end of the last mapping, is
 804         considered to be within the shared library address space, for
 805         our purposes.
 806
 807         For example, this routine is called at one point to disable
 808         breakpoints which are in shared libraries that are not currently
 809         mapped in.
 810  */
 811
 812 char *
 813 solib_address (address)
 814      CORE_ADDR address;
 815 {
 816   register struct so_list *so = 0;      /* link map state variable */
 817
 818   while ((so = find_solib (so)) != NULL)
 819     {
 820       if (so -> so_name[0] && so -> textsection)
 821         {
 822           if ((address >= (CORE_ADDR) so -> textsection -> addr) &&
 823               (address < (CORE_ADDR) so -> textsection -> endaddr))
 824             return (so->so_name);
 825         }
 826     }
 827   return (0);
 828 }
 829
 830 /* Called by free_all_symtabs */
 831
 832 void
 833 clear_solib()
 834 {
 835   struct so_list *next;
 836   char *bfd_filename;
 837
 838   while (so_list_head)
 839     {
 840       if (so_list_head -> sections)
 841         {
 842           free ((PTR)so_list_head -> sections);
 843         }
 844       if (so_list_head -> abfd)
 845         {
 846           bfd_filename = bfd_get_filename (so_list_head -> abfd);
 847           if (!bfd_close (so_list_head -> abfd))
 848             warning ("cannot close \"%s\": %s",
 849                      bfd_filename, bfd_errmsg (bfd_get_error ()));
 850         }
 851       else
 852         /* This happens for the executable on SVR4.  */
 853         bfd_filename = NULL;
 854
 855       next = so_list_head -> next;
 856       if (bfd_filename)
 857         free ((PTR)bfd_filename);
 858       free ((PTR)so_list_head);
 859       so_list_head = next;
 860     }
 861 }
 862
 863 /*
 864
 865 GLOBAL FUNCTION
 866
 867         solib_create_inferior_hook -- shared library startup support
 868
 869 SYNOPSIS
 870
 871         void solib_create_inferior_hook()
 872
 873 DESCRIPTION
 874
 875         When gdb starts up the inferior, it nurses it along (through the
 876         shell) until it is ready to execute it's first instruction.  At this
 877         point, this function gets called via expansion of the macro
 878         SOLIB_CREATE_INFERIOR_HOOK.
 879         For a statically bound executable, this first instruction is the
 880         one at "_start", or a similar text label. No further processing is
 881         needed in that case.
 882         For a dynamically bound executable, this first instruction is somewhere
 883         in the rld, and the actual user executable is not yet mapped in.
 884         We continue the inferior again, rld then maps in the actual user
 885         executable and any needed shared libraries and then sends
 886         itself a SIGTRAP.
 887         At that point we discover the names of all shared libraries and
 888         read their symbols in.
 889
 890 FIXME
 891
 892         This code does not properly handle hitting breakpoints which the
 893         user might have set in the rld itself.  Proper handling would have
 894         to check if the SIGTRAP happened due to a kill call.
 895
 896         Also, what if child has exit()ed?  Must exit loop somehow.
 897   */
 898
 899 void
 900 solib_create_inferior_hook()
 901 {
 902
 903   /* Nothing to do for statically bound executables.  */
 904
 905   if (symfile_objfile == NULL
 906       || symfile_objfile->obfd == NULL
 907       || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
 908     return;
 909
 910   /* Now run the target.  It will eventually get a SIGTRAP, at
 911      which point all of the libraries will have been mapped in and we
 912      can go groveling around in the rld structures to find
 913      out what we need to know about them. */
 914
 915   clear_proceed_status ();
 916   stop_soon_quietly = 1;
 917   stop_signal = TARGET_SIGNAL_0;
 918   do
 919     {
 920       target_resume (-1, 0, stop_signal);
 921       wait_for_inferior ();
 922     }
 923   while (stop_signal != TARGET_SIGNAL_TRAP);
 924
 925   /*  solib_add will call reinit_frame_cache.
 926       But we are stopped in the runtime loader and we do not have symbols
 927       for the runtime loader. So heuristic_proc_start will be called
 928       and will put out an annoying warning.
 929       Delaying the resetting of stop_soon_quietly until after symbol loading
 930       suppresses the warning.  */
 931   if (auto_solib_add)
 932     solib_add ((char *) 0, 0, (struct target_ops *) 0);
 933   stop_soon_quietly = 0;
 934 }
 935
 936
 937 /*
 938
 939 LOCAL FUNCTION
 940
 941         sharedlibrary_command -- handle command to explicitly add library
 942
 943 SYNOPSIS
 944
 945         static void sharedlibrary_command (char *args, int from_tty)
 946
 947 DESCRIPTION
 948
 949 */
 950
 951 static void
 952 sharedlibrary_command (args, from_tty)
 953 char *args;
 954 int from_tty;
 955 {
 956   dont_repeat ();
 957   solib_add (args, from_tty, (struct target_ops *) 0);
 958 }
 959
 960 void
 961 _initialize_solib()
 962 {
 963   add_com ("sharedlibrary", class_files, sharedlibrary_command,
 964            "Load shared object library symbols for files matching REGEXP.");
 965   add_info ("sharedlibrary", info_sharedlibrary_command,
 966             "Status of loaded shared object libraries.");
 967
 968   add_show_from_set
 969     (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
 970                   (char *) &auto_solib_add,
 971                   "Set autoloading of shared library symbols.\n\
 972 If nonzero, symbols from all shared object libraries will be loaded\n\
 973 automatically when the inferior begins execution or when the dynamic linker\n\
 974 informs gdb that a new library has been loaded.  Otherwise, symbols\n\
 975 must be loaded manually, using `sharedlibrary'.",
 976                   &setlist),
 977      &showlist);
 978 }