Initial creation of sourceware repository

1 files changed, 0 insertions, 1890 deletions

diff --git a/gdb/solib.c b/gdb/solib.c
deleted file mode 100644
index c8a8ce7..0000000
--- a/gdb/solib.c
+++ /dev/null
@@ -1,1890 +0,0 @@
-/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
-   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998
-   Free Software Foundation, Inc.
-   
-This file is part of GDB.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
-
-#include "defs.h"
-
-/* This file is only compilable if link.h is available. */
-
-#ifdef HAVE_LINK_H
-
-#include <sys/types.h>
-#include <signal.h>
-#include "gdb_string.h"
-#include <sys/param.h>
-#include <fcntl.h>
-#include <unistd.h>
-
-#ifndef SVR4_SHARED_LIBS
- /* SunOS shared libs need the nlist structure.  */
-#include <a.out.h> 
-#else
-#include "elf/external.h"
-#endif
-
-#include <link.h>
-
-#include "symtab.h"
-#include "bfd.h"
-#include "symfile.h"
-#include "objfiles.h"
-#include "gdbcore.h"
-#include "command.h"
-#include "target.h"
-#include "frame.h"
-#include "gnu-regex.h"
-#include "inferior.h"
-#include "environ.h"
-#include "language.h"
-#include "gdbcmd.h"
-
-#define MAX_PATH_SIZE 512		/* FIXME: Should be dynamic */
-
-/* On SVR4 systems, a list of symbols in the dynamic linker where
-   GDB can try to place a breakpoint to monitor shared library
-   events.
-
-   If none of these symbols are found, or other errors occur, then
-   SVR4 systems will fall back to using a symbol as the "startup
-   mapping complete" breakpoint address.  */
-
-#ifdef SVR4_SHARED_LIBS
-static char *solib_break_names[] = {
-  "r_debug_state",
-  "_r_debug_state",
-  "_dl_debug_state",
-  "rtld_db_dlactivity",
-  NULL
-};
-#endif
-
-#define BKPT_AT_SYMBOL 1
-
-#if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS)
-static char *bkpt_names[] = {
-#ifdef SOLIB_BKPT_NAME
-  SOLIB_BKPT_NAME,		/* Prefer configured name if it exists. */
-#endif
-  "_start",
-  "main",
-  NULL
-};
-#endif
-
-/* Symbols which are used to locate the base of the link map structures. */
-
-#ifndef SVR4_SHARED_LIBS
-static char *debug_base_symbols[] = {
-  "_DYNAMIC",
-  "_DYNAMIC__MGC",
-  NULL
-};
-#endif
-
-static char *main_name_list[] = {
-  "main_$main",
-  NULL
-};
-
-/* local data declarations */
-
-#ifndef SVR4_SHARED_LIBS
-
-#define LM_ADDR(so) ((so) -> lm.lm_addr)
-#define LM_NEXT(so) ((so) -> lm.lm_next)
-#define LM_NAME(so) ((so) -> lm.lm_name)
-/* Test for first link map entry; first entry is a shared library. */
-#define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0)
-static struct link_dynamic dynamic_copy;
-static struct link_dynamic_2 ld_2_copy;
-static struct ld_debug debug_copy;
-static CORE_ADDR debug_addr;
-static CORE_ADDR flag_addr;
-
-#else	/* SVR4_SHARED_LIBS */
-
-#define LM_ADDR(so) ((so) -> lm.l_addr)
-#define LM_NEXT(so) ((so) -> lm.l_next)
-#define LM_NAME(so) ((so) -> lm.l_name)
-/* Test for first link map entry; first entry is the exec-file. */
-#define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL)
-static struct r_debug debug_copy;
-char shadow_contents[BREAKPOINT_MAX];	/* Stash old bkpt addr contents */
-
-#endif	/* !SVR4_SHARED_LIBS */
-
-struct so_list {
-  struct so_list *next;			/* next structure in linked list */
-  struct link_map lm;			/* copy of link map from inferior */
-  struct link_map *lmaddr;		/* addr in inferior lm was read from */
-  CORE_ADDR lmend;			/* upper addr bound of mapped object */
-  char so_name[MAX_PATH_SIZE];		/* shared object lib name (FIXME) */
-  char symbols_loaded;			/* flag: symbols read in yet? */
-  char from_tty;			/* flag: print msgs? */
-  struct objfile *objfile;		/* objfile for loaded lib */
-  struct section_table *sections;
-  struct section_table *sections_end;
-  struct section_table *textsection;
-  bfd *abfd;
-};
-
-static struct so_list *so_list_head;	/* List of known shared objects */
-static CORE_ADDR debug_base;		/* Base of dynamic linker structures */
-static CORE_ADDR breakpoint_addr;	/* Address where end bkpt is set */
-
-static int solib_cleanup_queued = 0;    /* make_run_cleanup called */
-
-extern int
-fdmatch PARAMS ((int, int));		/* In libiberty */
-
-/* Local function prototypes */
-
-static void
-do_clear_solib PARAMS ((PTR));
-
-static int
-match_main PARAMS ((char *));
-
-static void
-special_symbol_handling PARAMS ((struct so_list *));
-
-static void
-sharedlibrary_command PARAMS ((char *, int));
-
-static int
-enable_break PARAMS ((void));
-
-static void
-info_sharedlibrary_command PARAMS ((char *, int));
-
-static int symbol_add_stub PARAMS ((PTR));
-
-static struct so_list *
-find_solib PARAMS ((struct so_list *));
-
-static struct link_map *
-first_link_map_member PARAMS ((void));
-
-static CORE_ADDR
-locate_base PARAMS ((void));
-
-static int solib_map_sections PARAMS ((PTR));
-
-#ifdef SVR4_SHARED_LIBS
-
-static CORE_ADDR
-elf_locate_base PARAMS ((void));
-
-#else
-
-static int
-disable_break PARAMS ((void));
-
-static void
-allocate_rt_common_objfile PARAMS ((void));
-
-static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *));
-
-#endif
-
-void _initialize_solib PARAMS ((void));
-
-/* If non-zero, this is a prefix that will be added to the front of the name
-   shared libraries with an absolute filename for loading.  */
-static char *solib_absolute_prefix = NULL;
-
-/* If non-empty, this is a search path for loading non-absolute shared library
-   symbol files.  This takes precedence over the environment variables PATH
-   and LD_LIBRARY_PATH.  */
-static char *solib_search_path = NULL;
-
-/*
-
-LOCAL FUNCTION
-
-	solib_map_sections -- open bfd and build sections for shared lib
-
-SYNOPSIS
-
-	static int solib_map_sections (struct so_list *so)
-
-DESCRIPTION
-
-	Given a pointer to one of the shared objects in our list
-	of mapped objects, use the recorded name to open a bfd
-	descriptor for the object, build a section table, and then
-	relocate all the section addresses by the base address at
-	which the shared object was mapped.
-
-FIXMES
-
-	In most (all?) cases the shared object file name recorded in the
-	dynamic linkage tables will be a fully qualified pathname.  For
-	cases where it isn't, do we really mimic the systems search
-	mechanism correctly in the below code (particularly the tilde
-	expansion stuff?).
- */
-
-static int
-solib_map_sections (arg)
-     PTR arg;
-{
-  struct so_list *so = (struct so_list *) arg;	/* catch_errors bogon */
-  char *filename;
-  char *scratch_pathname;
-  int scratch_chan;
-  struct section_table *p;
-  struct cleanup *old_chain;
-  bfd *abfd;
-  
-  filename = tilde_expand (so -> so_name);
-  
-  if (solib_absolute_prefix && ROOTED_P (filename))
-    /* Prefix shared libraries with absolute filenames with
-       SOLIB_ABSOLUTE_PREFIX.  */
-    {
-      char *pfxed_fn;
-      int pfx_len;
-
-      pfx_len = strlen (solib_absolute_prefix);
-
-      /* Remove trailing slashes.  */
-      while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1]))
-	pfx_len--;
-
-      pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1);
-      strcpy (pfxed_fn, solib_absolute_prefix);
-      strcat (pfxed_fn, filename);
-      free (filename);
-
-      filename = pfxed_fn;
-    }
-
-  old_chain = make_cleanup (free, filename);
-
-  scratch_chan = -1;
-
-  if (solib_search_path)
-    scratch_chan = openp (solib_search_path,
-			  1, filename, O_RDONLY, 0, &scratch_pathname);
-  if (scratch_chan < 0)
-    scratch_chan = openp (get_in_environ (inferior_environ, "PATH"), 
-			  1, filename, O_RDONLY, 0, &scratch_pathname);
-  if (scratch_chan < 0)
-    {
-      scratch_chan = openp (get_in_environ 
-			    (inferior_environ, "LD_LIBRARY_PATH"), 
-			    1, filename, O_RDONLY, 0, &scratch_pathname);
-    }
-  if (scratch_chan < 0)
-    {
-      perror_with_name (filename);
-    }
-  /* Leave scratch_pathname allocated.  abfd->name will point to it.  */
-
-  abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
-  if (!abfd)
-    {
-      close (scratch_chan);
-      error ("Could not open `%s' as an executable file: %s",
-	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
-    }
-  /* Leave bfd open, core_xfer_memory and "info files" need it.  */
-  so -> abfd = abfd;
-  abfd -> cacheable = true;
-
-  /* copy full path name into so_name, so that later symbol_file_add can find
-     it */
-  if (strlen (scratch_pathname) >= MAX_PATH_SIZE)
-    error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure.");
-  strcpy (so->so_name, scratch_pathname);
-
-  if (!bfd_check_format (abfd, bfd_object))
-    {
-      error ("\"%s\": not in executable format: %s.",
-	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
-    }
-  if (build_section_table (abfd, &so -> sections, &so -> sections_end))
-    {
-      error ("Can't find the file sections in `%s': %s", 
-	     bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
-    }
-
-  for (p = so -> sections; p < so -> sections_end; p++)
-    {
-      /* Relocate the section binding addresses as recorded in the shared
-	 object's file by the base address to which the object was actually
-	 mapped. */
-      p -> addr += (CORE_ADDR) LM_ADDR (so);
-      p -> endaddr += (CORE_ADDR) LM_ADDR (so);
-      so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
-      if (STREQ (p -> the_bfd_section -> name, ".text"))
-	{
-	  so -> textsection = p;
-	}
-    }
-
-  /* Free the file names, close the file now.  */
-  do_cleanups (old_chain);
-
-  return (1);
-}
-
-#ifndef SVR4_SHARED_LIBS
-
-/* Allocate the runtime common object file.  */
-
-static void
-allocate_rt_common_objfile ()
-{
-  struct objfile *objfile;
-  struct objfile *last_one;
-
-  objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
-  memset (objfile, 0, sizeof (struct objfile));
-  objfile -> md = NULL;
-  obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0,
-			      xmalloc, free);
-  obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc,
-			      free);
-  obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc,
-			      free);
-  obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc,
-			      free);
-  objfile -> name = mstrsave (objfile -> md, "rt_common");
-
-  /* Add this file onto the tail of the linked list of other such files. */
-
-  objfile -> next = NULL;
-  if (object_files == NULL)
-    object_files = objfile;
-  else
-    {
-      for (last_one = object_files;
-	   last_one -> next;
-	   last_one = last_one -> next);
-      last_one -> next = objfile;
-    }
-
-  rt_common_objfile = objfile;
-}
-
-/* Read all dynamically loaded common symbol definitions from the inferior
-   and put them into the minimal symbol table for the runtime common
-   objfile.  */
-
-static void
-solib_add_common_symbols (rtc_symp)
-    struct rtc_symb *rtc_symp;
-{
-  struct rtc_symb inferior_rtc_symb;
-  struct nlist inferior_rtc_nlist;
-  int len;
-  char *name;
-
-  /* Remove any runtime common symbols from previous runs.  */
-
-  if (rt_common_objfile != NULL && rt_common_objfile -> minimal_symbol_count)
-    {
-      obstack_free (&rt_common_objfile -> symbol_obstack, 0);
-      obstack_specify_allocation (&rt_common_objfile -> symbol_obstack, 0, 0,
-				  xmalloc, free);
-      rt_common_objfile -> minimal_symbol_count = 0;
-      rt_common_objfile -> msymbols = NULL;
-    }
-
-  init_minimal_symbol_collection ();
-  make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
-
-  while (rtc_symp)
-    {
-      read_memory ((CORE_ADDR) rtc_symp,
-		   (char *) &inferior_rtc_symb,
-		   sizeof (inferior_rtc_symb));
-      read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp,
-		   (char *) &inferior_rtc_nlist,
-		   sizeof(inferior_rtc_nlist));
-      if (inferior_rtc_nlist.n_type == N_COMM)
-	{
-	  /* FIXME: The length of the symbol name is not available, but in the
-	     current implementation the common symbol is allocated immediately
-	     behind the name of the symbol. */
-	  len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
-
-	  name = xmalloc (len);
-	  read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len);
-
-	  /* Allocate the runtime common objfile if necessary. */
-	  if (rt_common_objfile == NULL)
-	    allocate_rt_common_objfile ();
-
-	  prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
-				      mst_bss, rt_common_objfile);
-	  free (name);
-	}
-      rtc_symp = inferior_rtc_symb.rtc_next;
-    }
-
-  /* Install any minimal symbols that have been collected as the current
-     minimal symbols for the runtime common objfile.  */
-
-  install_minimal_symbols (rt_common_objfile);
-}
-
-#endif	/* SVR4_SHARED_LIBS */
-
-
-#ifdef SVR4_SHARED_LIBS
-
-static CORE_ADDR
-bfd_lookup_symbol PARAMS ((bfd *, char *));
-
-/*
-
-LOCAL FUNCTION
-
-	bfd_lookup_symbol -- lookup the value for a specific symbol
-
-SYNOPSIS
-
-	CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
-
-DESCRIPTION
-
-	An expensive way to lookup the value of a single symbol for
-	bfd's that are only temporary anyway.  This is used by the
-	shared library support to find the address of the debugger
-	interface structures in the shared library.
-
-	Note that 0 is specifically allowed as an error return (no
-	such symbol).
-*/
-
-static CORE_ADDR
-bfd_lookup_symbol (abfd, symname)
-     bfd *abfd;
-     char *symname;
-{
-  unsigned int storage_needed;
-  asymbol *sym;
-  asymbol **symbol_table;
-  unsigned int number_of_symbols;
-  unsigned int i;
-  struct cleanup *back_to;
-  CORE_ADDR symaddr = 0;
-  
-  storage_needed = bfd_get_symtab_upper_bound (abfd);
-
-  if (storage_needed > 0)
-    {
-      symbol_table = (asymbol **) xmalloc (storage_needed);
-      back_to = make_cleanup (free, (PTR)symbol_table);
-      number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); 
-  
-      for (i = 0; i < number_of_symbols; i++)
-	{
-	  sym = *symbol_table++;
-	  if (STREQ (sym -> name, symname))
-	    {
-	      /* Bfd symbols are section relative. */
-	      symaddr = sym -> value + sym -> section -> vma;
-	      break;
-	    }
-	}
-      do_cleanups (back_to);
-    }
-  return (symaddr);
-}
-
-#ifdef HANDLE_SVR4_EXEC_EMULATORS
-
-/*
-	Solaris BCP (the part of Solaris which allows it to run SunOS4
-	a.out files) throws in another wrinkle. Solaris does not fill
-	in the usual a.out link map structures when running BCP programs,
-	the only way to get at them is via groping around in the dynamic
-	linker.
-	The dynamic linker and it's structures are located in the shared
-	C library, which gets run as the executable's "interpreter" by
-	the kernel.
-
-	Note that we can assume nothing about the process state at the time
-	we need to find these structures.  We may be stopped on the first
-	instruction of the interpreter (C shared library), the first
-	instruction of the executable itself, or somewhere else entirely
-	(if we attached to the process for example).
-*/
-
-static char *debug_base_symbols[] = {
-  "r_debug",	/* Solaris 2.3 */
-  "_r_debug",	/* Solaris 2.1, 2.2 */
-  NULL
-};
-
-static int
-look_for_base PARAMS ((int, CORE_ADDR));
-
-/*
-
-LOCAL FUNCTION
-
-	look_for_base -- examine file for each mapped address segment
-
-SYNOPSYS
-
-	static int look_for_base (int fd, CORE_ADDR baseaddr)
-
-DESCRIPTION
-
-	This function is passed to proc_iterate_over_mappings, which
-	causes it to get called once for each mapped address space, with
-	an open file descriptor for the file mapped to that space, and the
-	base address of that mapped space.
-
-	Our job is to find the debug base symbol in the file that this
-	fd is open on, if it exists, and if so, initialize the dynamic
-	linker structure base address debug_base.
-
-	Note that this is a computationally expensive proposition, since
-	we basically have to open a bfd on every call, so we specifically
-	avoid opening the exec file.
- */
-
-static int
-look_for_base (fd, baseaddr)
-     int fd;
-     CORE_ADDR baseaddr;
-{
-  bfd *interp_bfd;
-  CORE_ADDR address = 0;
-  char **symbolp;
-
-  /* If the fd is -1, then there is no file that corresponds to this
-     mapped memory segment, so skip it.  Also, if the fd corresponds
-     to the exec file, skip it as well. */
-
-  if (fd == -1
-      || (exec_bfd != NULL
-	  && fdmatch (fileno ((FILE *)(exec_bfd -> iostream)), fd)))
-    {
-      return (0);
-    }
-
-  /* Try to open whatever random file this fd corresponds to.  Note that
-     we have no way currently to find the filename.  Don't gripe about
-     any problems we might have, just fail. */
-
-  if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
-    {
-      return (0);
-    }
-  if (!bfd_check_format (interp_bfd, bfd_object))
-    {
-      /* FIXME-leak: on failure, might not free all memory associated with
-	 interp_bfd.  */
-      bfd_close (interp_bfd);
-      return (0);
-    }
-
-  /* Now try to find our debug base symbol in this file, which we at
-     least know to be a valid ELF executable or shared library. */
-
-  for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
-    {
-      address = bfd_lookup_symbol (interp_bfd, *symbolp);
-      if (address != 0)
-	{
-	  break;
-	}
-    }
-  if (address == 0)
-    {
-      /* FIXME-leak: on failure, might not free all memory associated with
-	 interp_bfd.  */
-      bfd_close (interp_bfd);
-      return (0);
-    }
-
-  /* Eureka!  We found the symbol.  But now we may need to relocate it
-     by the base address.  If the symbol's value is less than the base
-     address of the shared library, then it hasn't yet been relocated
-     by the dynamic linker, and we have to do it ourself.  FIXME: Note
-     that we make the assumption that the first segment that corresponds
-     to the shared library has the base address to which the library
-     was relocated. */
-
-  if (address < baseaddr)
-    {
-      address += baseaddr;
-    }
-  debug_base = address;
-  /* FIXME-leak: on failure, might not free all memory associated with
-     interp_bfd.  */
-  bfd_close (interp_bfd);
-  return (1);
-}
-#endif /* HANDLE_SVR4_EXEC_EMULATORS */
-
-/*
-
-LOCAL FUNCTION
-
-	elf_locate_base -- locate the base address of dynamic linker structs
-	for SVR4 elf targets.
-
-SYNOPSIS
-
-	CORE_ADDR elf_locate_base (void)
-
-DESCRIPTION
-
-	For SVR4 elf targets the address of the dynamic linker's runtime
-	structure is contained within the dynamic info section in the
-	executable file.  The dynamic section is also mapped into the
-	inferior address space.  Because the runtime loader fills in the
-	real address before starting the inferior, we have to read in the
-	dynamic info section from the inferior address space.
-	If there are any errors while trying to find the address, we
-	silently return 0, otherwise the found address is returned.
-
- */
-
-static CORE_ADDR
-elf_locate_base ()
-{
-  sec_ptr dyninfo_sect;
-  int dyninfo_sect_size;
-  CORE_ADDR dyninfo_addr;
-  char *buf;
-  char *bufend;
-
-  /* Find the start address of the .dynamic section.  */
-  dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic");
-  if (dyninfo_sect == NULL)
-    return 0;
-  dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect);
-
-  /* Read in .dynamic section, silently ignore errors.  */
-  dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect);
-  buf = alloca (dyninfo_sect_size);
-  if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size))
-    return 0;
-
-  /* Find the DT_DEBUG entry in the the .dynamic section.
-     For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has
-     no DT_DEBUG entries.  */
-#ifndef TARGET_ELF64
-  for (bufend = buf + dyninfo_sect_size;
-       buf < bufend;
-       buf += sizeof (Elf32_External_Dyn))
-    {
-      Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *)buf;
-      long dyn_tag;
-      CORE_ADDR dyn_ptr;
-
-      dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
-      if (dyn_tag == DT_NULL)
-	break;
-      else if (dyn_tag == DT_DEBUG)
-	{
-	  dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
-	  return dyn_ptr;
-	}
-#ifdef DT_MIPS_RLD_MAP
-      else if (dyn_tag == DT_MIPS_RLD_MAP)
-	{
-	  char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT];
-
-	  /* DT_MIPS_RLD_MAP contains a pointer to the address
-	     of the dynamic link structure.  */
-	  dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
-	  if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf)))
-	    return 0;
-	  return extract_unsigned_integer (pbuf, sizeof (pbuf));
-	}
-#endif
-    }
-#else /* ELF64 */
-  for (bufend = buf + dyninfo_sect_size;
-       buf < bufend;
-       buf += sizeof (Elf64_External_Dyn))
-    {
-      Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *)buf;
-      long dyn_tag;
-      CORE_ADDR dyn_ptr;
-
-      dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
-      if (dyn_tag == DT_NULL)
-	break;
-      else if (dyn_tag == DT_DEBUG)
-	{
-	  dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
-	  return dyn_ptr;
-	}
-    }
-#endif
-
-  /* DT_DEBUG entry not found.  */
-  return 0;
-}
-
-#endif	/* SVR4_SHARED_LIBS */
-
-/*
-
-LOCAL FUNCTION
-
-	locate_base -- locate the base address of dynamic linker structs
-
-SYNOPSIS
-
-	CORE_ADDR locate_base (void)
-
-DESCRIPTION
-
-	For both the SunOS and SVR4 shared library implementations, if the
-	inferior executable has been linked dynamically, there is a single
-	address somewhere in the inferior's data space which is the key to
-	locating all of the dynamic linker's runtime structures.  This
-	address is the value of the debug base symbol.  The job of this
-	function is to find and return that address, or to return 0 if there
-	is no such address (the executable is statically linked for example).
-
-	For SunOS, the job is almost trivial, since the dynamic linker and
-	all of it's structures are statically linked to the executable at
-	link time.  Thus the symbol for the address we are looking for has
-	already been added to the minimal symbol table for the executable's
-	objfile at the time the symbol file's symbols were read, and all we
-	have to do is look it up there.  Note that we explicitly do NOT want
-	to find the copies in the shared library.
-
-	The SVR4 version is a bit more complicated because the address
-	is contained somewhere in the dynamic info section.  We have to go
-	to a lot more work to discover the address of the debug base symbol.
-	Because of this complexity, we cache the value we find and return that
-	value on subsequent invocations.  Note there is no copy in the
-	executable symbol tables.
-
- */
-
-static CORE_ADDR
-locate_base ()
-{
-
-#ifndef SVR4_SHARED_LIBS
-
-  struct minimal_symbol *msymbol;
-  CORE_ADDR address = 0;
-  char **symbolp;
-
-  /* For SunOS, we want to limit the search for the debug base symbol to the
-     executable being debugged, since there is a duplicate named symbol in the
-     shared library.  We don't want the shared library versions. */
-
-  for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
-    {
-      msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
-      if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
-	{
-	  address = SYMBOL_VALUE_ADDRESS (msymbol);
-	  return (address);
-	}
-    }
-  return (0);
-
-#else	/* SVR4_SHARED_LIBS */
-
-  /* Check to see if we have a currently valid address, and if so, avoid
-     doing all this work again and just return the cached address.  If
-     we have no cached address, try to locate it in the dynamic info
-     section for ELF executables.  */
-
-  if (debug_base == 0)
-    {
-      if (exec_bfd != NULL
-	  && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
-	debug_base = elf_locate_base ();
-#ifdef HANDLE_SVR4_EXEC_EMULATORS
-      /* Try it the hard way for emulated executables.  */
-      else if (inferior_pid != 0 && target_has_execution)
-	proc_iterate_over_mappings (look_for_base);
-#endif
-    }
-  return (debug_base);
-
-#endif	/* !SVR4_SHARED_LIBS */
-
-}
-
-/*
-
-LOCAL FUNCTION
-
-	first_link_map_member -- locate first member in dynamic linker's map
-
-SYNOPSIS
-
-	static struct link_map *first_link_map_member (void)
-
-DESCRIPTION
-
-	Read in a copy of the first member in the inferior's dynamic
-	link map from the inferior's dynamic linker structures, and return
-	a pointer to the copy in our address space.
-*/
-
-static struct link_map *
-first_link_map_member ()
-{
-  struct link_map *lm = NULL;
-
-#ifndef SVR4_SHARED_LIBS
-
-  read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
-  if (dynamic_copy.ld_version >= 2)
-    {
-      /* It is a version that we can deal with, so read in the secondary
-	 structure and find the address of the link map list from it. */
-      read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy,
-		   sizeof (struct link_dynamic_2));
-      lm = ld_2_copy.ld_loaded;
-    }
-
-#else	/* SVR4_SHARED_LIBS */
-
-  read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug));
-  /* FIXME:  Perhaps we should validate the info somehow, perhaps by
-     checking r_version for a known version number, or r_state for
-     RT_CONSISTENT. */
-  lm = debug_copy.r_map;
-
-#endif	/* !SVR4_SHARED_LIBS */
-
-  return (lm);
-}
-
-/*
-
-LOCAL FUNCTION
-
-	find_solib -- step through list of shared objects
-
-SYNOPSIS
-
-	struct so_list *find_solib (struct so_list *so_list_ptr)
-
-DESCRIPTION
-
-	This module contains the routine which finds the names of any
-	loaded "images" in the current process. The argument in must be
-	NULL on the first call, and then the returned value must be passed
-	in on subsequent calls. This provides the capability to "step" down
-	the list of loaded objects. On the last object, a NULL value is
-	returned.
-
-	The arg and return value are "struct link_map" pointers, as defined
-	in <link.h>.
- */
-
-static struct so_list *
-find_solib (so_list_ptr)
-     struct so_list *so_list_ptr;	/* Last lm or NULL for first one */
-{
-  struct so_list *so_list_next = NULL;
-  struct link_map *lm = NULL;
-  struct so_list *new;
-  
-  if (so_list_ptr == NULL)
-    {
-      /* We are setting up for a new scan through the loaded images. */
-      if ((so_list_next = so_list_head) == NULL)
-	{
-	  /* We have not already read in the dynamic linking structures
-	     from the inferior, lookup the address of the base structure. */
-	  debug_base = locate_base ();
-	  if (debug_base != 0)
-	    {
-	      /* Read the base structure in and find the address of the first
-		 link map list member. */
-	      lm = first_link_map_member ();
-	    }
-	}
-    }
-  else
-    {
-      /* We have been called before, and are in the process of walking
-	 the shared library list.  Advance to the next shared object. */
-      if ((lm = LM_NEXT (so_list_ptr)) == NULL)
-	{
-	  /* We have hit the end of the list, so check to see if any were
-	     added, but be quiet if we can't read from the target any more. */
-	  int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr,
-					   (char *) &(so_list_ptr -> lm),
-					   sizeof (struct link_map));
-	  if (status == 0)
-	    {
-	      lm = LM_NEXT (so_list_ptr);
-	    }
-	  else
-	    {
-	      lm = NULL;
-	    }
-	}
-      so_list_next = so_list_ptr -> next;
-    }
-  if ((so_list_next == NULL) && (lm != NULL))
-    {
-      /* Get next link map structure from inferior image and build a local
-	 abbreviated load_map structure */
-      new = (struct so_list *) xmalloc (sizeof (struct so_list));
-      memset ((char *) new, 0, sizeof (struct so_list));
-      new -> lmaddr = lm;
-      /* Add the new node as the next node in the list, or as the root
-	 node if this is the first one. */
-      if (so_list_ptr != NULL)
-	{
-	  so_list_ptr -> next = new;
-	}
-      else
-	{
-	  so_list_head = new;
-
-	  if (! solib_cleanup_queued)
-	    {
-	      make_run_cleanup (do_clear_solib, NULL);
-	      solib_cleanup_queued = 1;
-	    }
-	  
-	}      
-      so_list_next = new;
-      read_memory ((CORE_ADDR) lm, (char *) &(new -> lm),
-		   sizeof (struct link_map));
-      /* For SVR4 versions, the first entry in the link map is for the
-	 inferior executable, so we must ignore it.  For some versions of
-	 SVR4, it has no name.  For others (Solaris 2.3 for example), it
-	 does have a name, so we can no longer use a missing name to
-	 decide when to ignore it. */
-      if (!IGNORE_FIRST_LINK_MAP_ENTRY (new -> lm))
-	{
-	  int errcode;
-	  char *buffer;
-	  target_read_string ((CORE_ADDR) LM_NAME (new), &buffer,
-			      MAX_PATH_SIZE - 1, &errcode);
-	  if (errcode != 0)
-	    {
-	      warning ("find_solib: Can't read pathname for load map: %s\n",
-		       safe_strerror (errcode));
-	      return (so_list_next);
-	    }
-	  strncpy (new -> so_name, buffer, MAX_PATH_SIZE - 1);
-	  new -> so_name[MAX_PATH_SIZE - 1] = '\0';
-	  free (buffer);
-	  catch_errors (solib_map_sections, new,
-			"Error while mapping shared library sections:\n",
-			RETURN_MASK_ALL);
-	}      
-    }
-  return (so_list_next);
-}
-
-/* A small stub to get us past the arg-passing pinhole of catch_errors.  */
-
-static int
-symbol_add_stub (arg)
-     PTR arg;
-{
-  register struct so_list *so = (struct so_list *) arg;	/* catch_errs bogon */
-  CORE_ADDR text_addr = 0;
-
-  if (so -> textsection)
-    text_addr = so -> textsection -> addr;
-  else if (so -> abfd != NULL)
-    {
-      asection *lowest_sect;
-
-      /* If we didn't find a mapped non zero sized .text section, set up
-	 text_addr so that the relocation in symbol_file_add does no harm.  */
-
-      lowest_sect = bfd_get_section_by_name (so -> abfd, ".text");
-      if (lowest_sect == NULL)
-	bfd_map_over_sections (so -> abfd, find_lowest_section,
-			       (PTR) &lowest_sect);
-      if (lowest_sect)
-	text_addr = bfd_section_vma (so -> abfd, lowest_sect)
-		    + (CORE_ADDR) LM_ADDR (so);
-    }
-  
-  ALL_OBJFILES (so -> objfile)
-    {
-      if (strcmp (so -> objfile -> name, so -> so_name) == 0)
-	return 1;
-    }
-  so -> objfile =
-    symbol_file_add (so -> so_name, so -> from_tty,
-		     text_addr,
-		     0, 0, 0, 0, 1);
-  return (1);
-}
-
-/* This function will check the so name to see if matches the main list.
-   In some system the main object is in the list, which we want to exclude */
-
-static int match_main (soname)
-    char *soname;
-{
-  char **mainp;
-
-  for (mainp = main_name_list; *mainp != NULL; mainp++)
-    {
-      if (strcmp (soname, *mainp) == 0)
-	return (1);
-    }
-
-  return (0);
-}
-
-/*
-
-GLOBAL FUNCTION
-
-	solib_add -- add a shared library file to the symtab and section list
-
-SYNOPSIS
-
-	void solib_add (char *arg_string, int from_tty,
-			struct target_ops *target)
-
-DESCRIPTION
-
-*/
-
-void
-solib_add (arg_string, from_tty, target)
-     char *arg_string;
-     int from_tty;
-     struct target_ops *target;
-{	
-  register struct so_list *so = NULL;   	/* link map state variable */
-
-  /* Last shared library that we read.  */
-  struct so_list *so_last = NULL;
-
-  char *re_err;
-  int count;
-  int old;
-  
-  if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
-    {
-      error ("Invalid regexp: %s", re_err);
-    }
-  
-  /* Add the shared library sections to the section table of the
-     specified target, if any.  */
-  if (target)
-    {
-      /* Count how many new section_table entries there are.  */
-      so = NULL;
-      count = 0;
-      while ((so = find_solib (so)) != NULL)
-	{
-	  if (so -> so_name[0] && !match_main (so -> so_name))
-	    {
-	      count += so -> sections_end - so -> sections;
-	    }
-	}
-      
-      if (count)
-	{
-	  int update_coreops;
-
-	  /* We must update the to_sections field in the core_ops structure
-	     here, otherwise we dereference a potential dangling pointer
-	     for each call to target_read/write_memory within this routine.  */
-	  update_coreops = core_ops.to_sections == target->to_sections;
-          	     
-	  /* Reallocate the target's section table including the new size.  */
-	  if (target -> to_sections)
-	    {
-	      old = target -> to_sections_end - target -> to_sections;
-	      target -> to_sections = (struct section_table *)
-		xrealloc ((char *)target -> to_sections,
-			 (sizeof (struct section_table)) * (count + old));
-	    }
-	  else
-	    {
-	      old = 0;
-	      target -> to_sections = (struct section_table *)
-		xmalloc ((sizeof (struct section_table)) * count);
-	    }
-	  target -> to_sections_end = target -> to_sections + (count + old);
-	  
-	  /* Update the to_sections field in the core_ops structure
-	     if needed.  */
-	  if (update_coreops)
-	    {
-	      core_ops.to_sections = target->to_sections;
-	      core_ops.to_sections_end = target->to_sections_end;
-	    }
-
-	  /* Add these section table entries to the target's table.  */
-	  while ((so = find_solib (so)) != NULL)
-	    {
-	      if (so -> so_name[0])
-		{
-		  count = so -> sections_end - so -> sections;
-		  memcpy ((char *) (target -> to_sections + old),
-			  so -> sections, 
-			  (sizeof (struct section_table)) * count);
-		  old += count;
-		}
-	    }
-	}
-    }
-  
-  /* Now add the symbol files.  */
-  while ((so = find_solib (so)) != NULL)
-    {
-      if (so -> so_name[0] && re_exec (so -> so_name) && 
-      !match_main (so -> so_name))
-	{
-	  so -> from_tty = from_tty;
-	  if (so -> symbols_loaded)
-	    {
-	      if (from_tty)
-		{
-		  printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
-		}
-	    }
-	  else if (catch_errors
-		   (symbol_add_stub, so,
-		    "Error while reading shared library symbols:\n",
-		    RETURN_MASK_ALL))
-	    {
-	      so_last = so;
-	      so -> symbols_loaded = 1;
-	    }
-	}
-    }
-
-  /* Getting new symbols may change our opinion about what is
-     frameless.  */
-  if (so_last)
-    reinit_frame_cache ();
-
-  if (so_last)
-    special_symbol_handling (so_last);
-}
-
-/*
-
-LOCAL FUNCTION
-
-	info_sharedlibrary_command -- code for "info sharedlibrary"
-
-SYNOPSIS
-
-	static void info_sharedlibrary_command ()
-
-DESCRIPTION
-
-	Walk through the shared library list and print information
-	about each attached library.
-*/
-
-static void
-info_sharedlibrary_command (ignore, from_tty)
-     char *ignore;
-     int from_tty;
-{
-  register struct so_list *so = NULL;  	/* link map state variable */
-  int header_done = 0;
-  int addr_width;
-  char *addr_fmt;
-
-  if (exec_bfd == NULL)
-    {
-      printf_unfiltered ("No exec file.\n");
-      return;
-    }
-
-#ifndef TARGET_ELF64
-  addr_width = 8+4;
-  addr_fmt = "08l";
-#else
-  addr_width = 16+4;
-  addr_fmt = "016l";
-#endif
-
-  while ((so = find_solib (so)) != NULL)
-    {
-      if (so -> so_name[0])
-	{
-	  if (!header_done)
-	    {
-	      printf_unfiltered("%-*s%-*s%-12s%s\n", addr_width, "From",
-				addr_width, "To", "Syms Read",
-				"Shared Object Library");
-	      header_done++;
-	    }
-
-	  printf_unfiltered ("%-*s", addr_width,
-		  local_hex_string_custom ((unsigned long) LM_ADDR (so),
-					   addr_fmt));
-	  printf_unfiltered ("%-*s", addr_width,
-		  local_hex_string_custom ((unsigned long) so -> lmend,
-					   addr_fmt));
-	  printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
-	  printf_unfiltered ("%s\n",  so -> so_name);
-	}
-    }
-  if (so_list_head == NULL)
-    {
-      printf_unfiltered ("No shared libraries loaded at this time.\n");	
-    }
-}
-
-/*
-
-GLOBAL FUNCTION
-
-	solib_address -- check to see if an address is in a shared lib
-
-SYNOPSIS
-
-	char * solib_address (CORE_ADDR address)
-
-DESCRIPTION
-
-	Provides a hook for other gdb routines to discover whether or
-	not a particular address is within the mapped address space of
-	a shared library.  Any address between the base mapping address
-	and the first address beyond the end of the last mapping, is
-	considered to be within the shared library address space, for
-	our purposes.
-
-	For example, this routine is called at one point to disable
-	breakpoints which are in shared libraries that are not currently
-	mapped in.
- */
-
-char *
-solib_address (address)
-     CORE_ADDR address;
-{
-  register struct so_list *so = 0;   	/* link map state variable */
-  
-  while ((so = find_solib (so)) != NULL)
-    {
-      if (so -> so_name[0])
-	{
-	  if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
-	      (address < (CORE_ADDR) so -> lmend))
-	    return (so->so_name);
-	}
-    }
-  return (0);
-}
-
-/* Called by free_all_symtabs */
-
-void 
-clear_solib()
-{
-  struct so_list *next;
-  char *bfd_filename;
-  
-  disable_breakpoints_in_shlibs (1);
-
-  while (so_list_head)
-    {
-      if (so_list_head -> sections)
-	{
-	  free ((PTR)so_list_head -> sections);
-	}
-      if (so_list_head -> abfd)
-	{
-	  bfd_filename = bfd_get_filename (so_list_head -> abfd);
-	  if (!bfd_close (so_list_head -> abfd))
-	    warning ("cannot close \"%s\": %s",
-		     bfd_filename, bfd_errmsg (bfd_get_error ()));
-	}
-      else
-	/* This happens for the executable on SVR4.  */
-	bfd_filename = NULL;
-
-      next = so_list_head -> next;
-      if (bfd_filename)
-	free ((PTR)bfd_filename);
-      free ((PTR)so_list_head);
-      so_list_head = next;
-    }
-  debug_base = 0;
-}
-
-static void
-do_clear_solib (dummy)
-     PTR dummy;
-{
-  solib_cleanup_queued = 0;
-  clear_solib ();
-}
-
-#ifdef SVR4_SHARED_LIBS
-
-/* Return 1 if PC lies in the dynamic symbol resolution code of the
-   SVR4 run time loader.  */
-
-static CORE_ADDR interp_text_sect_low;
-static CORE_ADDR interp_text_sect_high;
-static CORE_ADDR interp_plt_sect_low;
-static CORE_ADDR interp_plt_sect_high;
-
-int
-in_svr4_dynsym_resolve_code (pc)
-     CORE_ADDR pc;
-{
-  return ((pc >= interp_text_sect_low && pc < interp_text_sect_high)
-	  || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high)
-	  || in_plt_section (pc, NULL));
-}
-#endif
-
-/*
-
-LOCAL FUNCTION
-
-	disable_break -- remove the "mapping changed" breakpoint
-
-SYNOPSIS
-
-	static int disable_break ()
-
-DESCRIPTION
-
-	Removes the breakpoint that gets hit when the dynamic linker
-	completes a mapping change.
-
-*/
-
-#ifndef SVR4_SHARED_LIBS
-
-static int
-disable_break ()
-{
-  int status = 1;
-
-#ifndef SVR4_SHARED_LIBS
-
-  int in_debugger = 0;
-  
-  /* Read the debugger structure from the inferior to retrieve the
-     address of the breakpoint and the original contents of the
-     breakpoint address.  Remove the breakpoint by writing the original
-     contents back. */
-
-  read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
-
-  /* Set `in_debugger' to zero now. */
-
-  write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
-
-  breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
-  write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
-		sizeof (debug_copy.ldd_bp_inst));
-
-#else	/* SVR4_SHARED_LIBS */
-
-  /* Note that breakpoint address and original contents are in our address
-     space, so we just need to write the original contents back. */
-
-  if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
-    {
-      status = 0;
-    }
-
-#endif	/* !SVR4_SHARED_LIBS */
-
-  /* For the SVR4 version, we always know the breakpoint address.  For the
-     SunOS version we don't know it until the above code is executed.
-     Grumble if we are stopped anywhere besides the breakpoint address. */
-
-  if (stop_pc != breakpoint_addr)
-    {
-      warning ("stopped at unknown breakpoint while handling shared libraries");
-    }
-
-  return (status);
-}
-
-#endif	/* #ifdef SVR4_SHARED_LIBS */
-
-/*
-
-LOCAL FUNCTION
-
-	enable_break -- arrange for dynamic linker to hit breakpoint
-
-SYNOPSIS
-
-	int enable_break (void)
-
-DESCRIPTION
-
-	Both the SunOS and the SVR4 dynamic linkers have, as part of their
-	debugger interface, support for arranging for the inferior to hit
-	a breakpoint after mapping in the shared libraries.  This function
-	enables that breakpoint.
-
-	For SunOS, there is a special flag location (in_debugger) which we
-	set to 1.  When the dynamic linker sees this flag set, it will set
-	a breakpoint at a location known only to itself, after saving the
-	original contents of that place and the breakpoint address itself,
-	in it's own internal structures.  When we resume the inferior, it
-	will eventually take a SIGTRAP when it runs into the breakpoint.
-	We handle this (in a different place) by restoring the contents of
-	the breakpointed location (which is only known after it stops),
-	chasing around to locate the shared libraries that have been
-	loaded, then resuming.
-
-	For SVR4, the debugger interface structure contains a member (r_brk)
-	which is statically initialized at the time the shared library is
-	built, to the offset of a function (_r_debug_state) which is guaran-
-	teed to be called once before mapping in a library, and again when
-	the mapping is complete.  At the time we are examining this member,
-	it contains only the unrelocated offset of the function, so we have
-	to do our own relocation.  Later, when the dynamic linker actually
-	runs, it relocates r_brk to be the actual address of _r_debug_state().
-
-	The debugger interface structure also contains an enumeration which
-	is set to either RT_ADD or RT_DELETE prior to changing the mapping,
-	depending upon whether or not the library is being mapped or unmapped,
-	and then set to RT_CONSISTENT after the library is mapped/unmapped.
-*/
-
-static int
-enable_break ()
-{
-  int success = 0;
-
-#ifndef SVR4_SHARED_LIBS
-
-  int j;
-  int in_debugger;
-
-  /* Get link_dynamic structure */
-
-  j = target_read_memory (debug_base, (char *) &dynamic_copy,
-			  sizeof (dynamic_copy));
-  if (j)
-    {
-      /* unreadable */
-      return (0);
-    }
-
-  /* Calc address of debugger interface structure */
-
-  debug_addr = (CORE_ADDR) dynamic_copy.ldd;
-
-  /* Calc address of `in_debugger' member of debugger interface structure */
-
-  flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
-					(char *) &debug_copy);
-
-  /* Write a value of 1 to this member.  */
-
-  in_debugger = 1;
-  write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
-  success = 1;
-
-#else	/* SVR4_SHARED_LIBS */
-
-#ifdef BKPT_AT_SYMBOL
-
-  struct minimal_symbol *msymbol;
-  char **bkpt_namep;
-  asection *interp_sect;
-
-  /* First, remove all the solib event breakpoints.  Their addresses
-     may have changed since the last time we ran the program.  */
-  remove_solib_event_breakpoints ();
-
-#ifdef SVR4_SHARED_LIBS
-  interp_text_sect_low = interp_text_sect_high = 0;
-  interp_plt_sect_low = interp_plt_sect_high = 0;
-
-  /* Find the .interp section; if not found, warn the user and drop
-     into the old breakpoint at symbol code.  */
-  interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
-  if (interp_sect)
-    {
-      unsigned int interp_sect_size;
-      char *buf;
-      CORE_ADDR load_addr;
-      bfd *tmp_bfd;
-      CORE_ADDR sym_addr = 0;
-
-      /* Read the contents of the .interp section into a local buffer;
-	 the contents specify the dynamic linker this program uses.  */
-      interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
-      buf = alloca (interp_sect_size);
-      bfd_get_section_contents (exec_bfd, interp_sect,
-				buf, 0, interp_sect_size);
-
-      /* Now we need to figure out where the dynamic linker was
-	 loaded so that we can load its symbols and place a breakpoint
-	 in the dynamic linker itself.
-
-	 This address is stored on the stack.  However, I've been unable
-	 to find any magic formula to find it for Solaris (appears to
-	 be trivial on GNU/Linux).  Therefore, we have to try an alternate
-	 mechanism to find the dynamic linker's base address.  */
-      tmp_bfd = bfd_openr (buf, gnutarget);
-      if (tmp_bfd == NULL)
-	goto bkpt_at_symbol;
-
-      /* Make sure the dynamic linker's really a useful object.  */
-      if (!bfd_check_format (tmp_bfd, bfd_object))
-	{
-	  warning ("Unable to grok dynamic linker %s as an object file", buf);
-	  bfd_close (tmp_bfd);
-	  goto bkpt_at_symbol;
-	}
-
-      /* We find the dynamic linker's base address by examining the
-	 current pc (which point at the entry point for the dynamic
-	 linker) and subtracting the offset of the entry point.  */
-      load_addr = read_pc () - tmp_bfd->start_address;
-
-      /* Record the relocated start and end address of the dynamic linker
-	 text and plt section for in_svr4_dynsym_resolve_code.  */
-      interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
-      if (interp_sect)
-	{
-	  interp_text_sect_low =
-	    bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
-	  interp_text_sect_high =
-	    interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect);
-	}
-      interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
-      if (interp_sect)
-	{
-	  interp_plt_sect_low =
-	    bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
-	  interp_plt_sect_high =
-	    interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
-	}
-
-      /* Now try to set a breakpoint in the dynamic linker.  */
-      for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
-	{
-	  sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep);
-	  if (sym_addr != 0)
-	    break;
-	}
-
-      /* We're done with the temporary bfd.  */
-      bfd_close (tmp_bfd);
-
-      if (sym_addr != 0)
-	{
-	  create_solib_event_breakpoint (load_addr + sym_addr);
-	  return 1;
-	}
-
-      /* For whatever reason we couldn't set a breakpoint in the dynamic
-	 linker.  Warn and drop into the old code.  */
-bkpt_at_symbol:
-      warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code.");
-    }
-#endif
-
-  /* Scan through the list of symbols, trying to look up the symbol and
-     set a breakpoint there.  Terminate loop when we/if we succeed. */
-
-  breakpoint_addr = 0;
-  for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
-    {
-      msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
-      if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
-	{
-	  create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
-	  return 1;
-	}
-    }
-
-  /* Nothing good happened.  */
-  success = 0;
-
-#endif	/* BKPT_AT_SYMBOL */
-
-#endif	/* !SVR4_SHARED_LIBS */
-
-  return (success);
-}
-  
-/*
-  
-GLOBAL FUNCTION
-  
-	solib_create_inferior_hook -- shared library startup support
-  
-SYNOPSIS
-  
-	void solib_create_inferior_hook()
-  
-DESCRIPTION
-  
-	When gdb starts up the inferior, it nurses it along (through the
-	shell) until it is ready to execute it's first instruction.  At this
-	point, this function gets called via expansion of the macro
-	SOLIB_CREATE_INFERIOR_HOOK.
-
-	For SunOS executables, this first instruction is typically the
-	one at "_start", or a similar text label, regardless of whether
-	the executable is statically or dynamically linked.  The runtime
-	startup code takes care of dynamically linking in any shared
-	libraries, once gdb allows the inferior to continue.
-
-	For SVR4 executables, this first instruction is either the first
-	instruction in the dynamic linker (for dynamically linked
-	executables) or the instruction at "start" for statically linked
-	executables.  For dynamically linked executables, the system
-	first exec's /lib/libc.so.N, which contains the dynamic linker,
-	and starts it running.  The dynamic linker maps in any needed
-	shared libraries, maps in the actual user executable, and then
-	jumps to "start" in the user executable.
-
-	For both SunOS shared libraries, and SVR4 shared libraries, we
-	can arrange to cooperate with the dynamic linker to discover the
-	names of shared libraries that are dynamically linked, and the
-	base addresses to which they are linked.
-
-	This function is responsible for discovering those names and
-	addresses, and saving sufficient information about them to allow
-	their symbols to be read at a later time.
-
-FIXME
-
-	Between enable_break() and disable_break(), this code does not
-	properly handle hitting breakpoints which the user might have
-	set in the startup code or in the dynamic linker itself.  Proper
-	handling will probably have to wait until the implementation is
-	changed to use the "breakpoint handler function" method.
-
-	Also, what if child has exit()ed?  Must exit loop somehow.
-  */
-
-void 
-solib_create_inferior_hook()
-{
-  /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base
-     yet.  In fact, in the case of a SunOS4 executable being run on
-     Solaris, we can't get it yet.  find_solib will get it when it needs
-     it.  */
-#if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL))
-  if ((debug_base = locate_base ()) == 0)
-    {
-      /* Can't find the symbol or the executable is statically linked. */
-      return;
-    }
-#endif
-
-  if (!enable_break ())
-    {
-      warning ("shared library handler failed to enable breakpoint");
-      return;
-    }
-
-#if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS)
-  /* SCO and SunOS need the loop below, other systems should be using the
-     special shared library breakpoints and the shared library breakpoint
-     service routine.
-
-     Now run the target.  It will eventually hit the breakpoint, at
-     which point all of the libraries will have been mapped in and we
-     can go groveling around in the dynamic linker structures to find
-     out what we need to know about them. */
-
-  clear_proceed_status ();
-  stop_soon_quietly = 1;
-  stop_signal = TARGET_SIGNAL_0;
-  do
-    {
-      target_resume (-1, 0, stop_signal);
-      wait_for_inferior ();
-    }
-  while (stop_signal != TARGET_SIGNAL_TRAP);
-  stop_soon_quietly = 0;
-
-#if !defined(_SCO_DS)
-  /* We are now either at the "mapping complete" breakpoint (or somewhere
-     else, a condition we aren't prepared to deal with anyway), so adjust
-     the PC as necessary after a breakpoint, disable the breakpoint, and
-     add any shared libraries that were mapped in. */
-
-  if (DECR_PC_AFTER_BREAK)
-    {
-      stop_pc -= DECR_PC_AFTER_BREAK;
-      write_register (PC_REGNUM, stop_pc);
-    }
-
-  if (!disable_break ())
-    {
-      warning ("shared library handler failed to disable breakpoint");
-    }
-
-  if (auto_solib_add)
-    solib_add ((char *) 0, 0, (struct target_ops *) 0);
-#endif /* ! _SCO_DS */
-#endif
-}
-
-/*
-
-LOCAL FUNCTION
-
-	special_symbol_handling -- additional shared library symbol handling
-
-SYNOPSIS
-
-	void special_symbol_handling (struct so_list *so)
-
-DESCRIPTION
-
-	Once the symbols from a shared object have been loaded in the usual
-	way, we are called to do any system specific symbol handling that 
-	is needed.
-
-	For SunOS4, this consists of grunging around in the dynamic
-	linkers structures to find symbol definitions for "common" symbols
-	and adding them to the minimal symbol table for the runtime common
-	objfile.
-
-*/
-
-static void
-special_symbol_handling (so)
-struct so_list *so;
-{
-#ifndef SVR4_SHARED_LIBS
-  int j;
-
-  if (debug_addr == 0)
-    {
-      /* Get link_dynamic structure */
-
-      j = target_read_memory (debug_base, (char *) &dynamic_copy,
-			      sizeof (dynamic_copy));
-      if (j)
-	{
-	  /* unreadable */
-	  return;
-	}
-
-      /* Calc address of debugger interface structure */
-      /* FIXME, this needs work for cross-debugging of core files
-	 (byteorder, size, alignment, etc).  */
-
-      debug_addr = (CORE_ADDR) dynamic_copy.ldd;
-    }
-
-  /* Read the debugger structure from the inferior, just to make sure
-     we have a current copy. */
-
-  j = target_read_memory (debug_addr, (char *) &debug_copy,
-			  sizeof (debug_copy));
-  if (j)
-    return;		/* unreadable */
-
-  /* Get common symbol definitions for the loaded object. */
-
-  if (debug_copy.ldd_cp)
-    {
-      solib_add_common_symbols (debug_copy.ldd_cp);
-    }
-
-#endif	/* !SVR4_SHARED_LIBS */
-}
-
-
-/*
-
-LOCAL FUNCTION
-
-	sharedlibrary_command -- handle command to explicitly add library
-
-SYNOPSIS
-
-	static void sharedlibrary_command (char *args, int from_tty)
-
-DESCRIPTION
-
-*/
-
-static void
-sharedlibrary_command (args, from_tty)
-char *args;
-int from_tty;
-{
-  dont_repeat ();
-  solib_add (args, from_tty, (struct target_ops *) 0);
-}
-
-#endif /* HAVE_LINK_H */
-
-void
-_initialize_solib()
-{
-#ifdef HAVE_LINK_H
-
-  add_com ("sharedlibrary", class_files, sharedlibrary_command,
-	   "Load shared object library symbols for files matching REGEXP.");
-  add_info ("sharedlibrary", info_sharedlibrary_command, 
-	    "Status of loaded shared object libraries.");
-
-  add_show_from_set
-    (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
-		  (char *) &auto_solib_add,
-		  "Set autoloading of shared library symbols.\n\
-If nonzero, symbols from all shared object libraries will be loaded\n\
-automatically when the inferior begins execution or when the dynamic linker\n\
-informs gdb that a new library has been loaded.  Otherwise, symbols\n\
-must be loaded manually, using `sharedlibrary'.",
-		  &setlist),
-     &showlist);
-
-  add_show_from_set
-    (add_set_cmd ("solib-absolute-prefix", class_support, var_filename,
-		  (char *) &solib_absolute_prefix,
-		  "Set prefix for loading absolute shared library symbol files.\n\
-For other (relative) files, you can add values using `set solib-search-path'.",
-		  &setlist),
-     &showlist);
-  add_show_from_set
-    (add_set_cmd ("solib-search-path", class_support, var_string,
-		  (char *) &solib_search_path,
-		  "Set the search path for loading non-absolute shared library symbol files.\n\
-This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
-		  &setlist),
-     &showlist);
-
-#endif /* HAVE_LINK_H */
-}