Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 980 insertions, 0 deletions

diff --git a/gdb/osfsolib.c b/gdb/osfsolib.c
new file mode 100644
index 0000000..31c9bf9
--- /dev/null
+++ b/gdb/osfsolib.c
@@ -0,0 +1,980 @@
+/* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
+   Copyright 1993, 94, 95, 96, 98, 1999 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.  */
+
+/* FIXME: Most of this code could be merged with solib.c by using
+   next_link_map_member and xfer_link_map_member in solib.c.  */
+
+#include "defs.h"
+
+#include <sys/types.h>
+#include <signal.h>
+#include "gdb_string.h"
+#include <fcntl.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 "language.h"
+#include "gdbcmd.h"
+
+#define MAX_PATH_SIZE 1024		/* FIXME: Should be dynamic */
+
+/* When handling shared libraries, GDB has to find out the pathnames
+   of all shared libraries that are currently loaded (to read in their
+   symbols) and where the shared libraries are loaded in memory
+   (to relocate them properly from their prelinked addresses to the
+   current load address).
+
+   Under OSF/1 there are two possibilities to get at this information:
+   1) Peek around in the runtime loader structures.
+      These are not documented, and they are not defined in the system
+      header files. The definitions below were obtained by experimentation,
+      but they seem stable enough.
+   2) Use the undocumented libxproc.a library, which contains the
+      equivalent ldr_* routines.
+      This approach is somewhat cleaner, but it requires that the GDB
+      executable is dynamically linked. In addition it requires a
+      NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context
+      linker specification for GDB and all applications that are using
+      libgdb.
+   We will use the peeking approach until it becomes unwieldy.  */
+
+#ifndef USE_LDR_ROUTINES
+
+/* Definition of runtime loader structures, found by experimentation.  */
+#define RLD_CONTEXT_ADDRESS	0x3ffc0000000
+
+typedef struct
+{
+	CORE_ADDR next;
+	CORE_ADDR previous;
+	CORE_ADDR unknown1;
+	char *module_name;
+	CORE_ADDR modinfo_addr;
+	long module_id;
+	CORE_ADDR unknown2;
+	CORE_ADDR unknown3;
+	long region_count;
+	CORE_ADDR regioninfo_addr;
+} ldr_module_info_t;
+
+typedef struct
+{
+	long unknown1;
+	CORE_ADDR regionname_addr;
+	long protection;
+	CORE_ADDR vaddr;
+	CORE_ADDR mapaddr;
+	long size;
+	long unknown2[5];
+} ldr_region_info_t;
+
+typedef struct
+{
+	CORE_ADDR unknown1;
+	CORE_ADDR unknown2;
+	CORE_ADDR head;
+	CORE_ADDR tail;
+} ldr_context_t;
+
+static ldr_context_t ldr_context;
+
+#else
+
+#include <loader.h>
+static ldr_process_t fake_ldr_process;
+
+/* Called by ldr_* routines to read memory from the current target.  */
+
+static int ldr_read_memory PARAMS ((CORE_ADDR, char *, int, int));
+
+static int
+ldr_read_memory (memaddr, myaddr, len, readstring)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int readstring;
+{
+  int result;
+  char *buffer;
+
+  if (readstring)
+    {
+      target_read_string (memaddr, &buffer, len, &result);
+      if (result == 0)
+        strcpy (myaddr, buffer);
+      free (buffer);
+    }
+  else
+    result = target_read_memory (memaddr, myaddr, len);
+
+  if (result != 0)
+    result = -result;
+  return result;
+}
+
+#endif
+
+/* Define our own link_map structure.
+   This will help to share code with solib.c.  */
+
+struct link_map {
+  CORE_ADDR l_offset;			/* prelink to load address offset */
+  char *l_name;				/* full name of loaded object */
+  ldr_module_info_t module_info;	/* corresponding module info */
+};
+
+#define LM_OFFSET(so) ((so) -> lm.l_offset)
+#define LM_NAME(so) ((so) -> lm.l_name)
+
+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 */
+
+extern int
+fdmatch PARAMS ((int, int));		/* In libiberty */
+
+/* Local function prototypes */
+
+static void
+sharedlibrary_command PARAMS ((char *, int));
+
+static void
+info_sharedlibrary_command PARAMS ((char *, int));
+
+static int
+symbol_add_stub PARAMS ((char *));
+
+static struct so_list *
+find_solib PARAMS ((struct so_list *));
+
+static struct link_map *
+first_link_map_member PARAMS ((void));
+
+static struct link_map *
+next_link_map_member PARAMS ((struct so_list *));
+
+static void
+xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
+
+static int
+solib_map_sections PARAMS ((char *));
+
+/*
+
+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)
+     char *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);
+  old_chain = make_cleanup (free, filename);
+  
+  scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
+			&scratch_pathname);
+  if (scratch_chan < 0)
+    {
+      scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
+			    O_RDONLY, 0, &scratch_pathname);
+    }
+  if (scratch_chan < 0)
+    {
+      perror_with_name (filename);
+    }
+  /* Leave scratch_pathname allocated.  bfd->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;
+
+  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 (exec_bfd), 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 offset to get the address to which the
+	 object was actually mapped.  */
+      p -> addr += LM_OFFSET (so);
+      p -> endaddr += LM_OFFSET (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);
+}
+
+/*
+
+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;
+  static struct link_map first_lm;
+
+#ifdef USE_LDR_ROUTINES
+  ldr_module_t mod_id = LDR_NULL_MODULE;
+  size_t retsize;
+
+  fake_ldr_process = ldr_core_process ();
+  ldr_set_core_reader (ldr_read_memory);
+  ldr_xdetach (fake_ldr_process);
+  if (ldr_xattach (fake_ldr_process) != 0
+      || ldr_next_module(fake_ldr_process, &mod_id) != 0
+      || mod_id == LDR_NULL_MODULE
+      || ldr_inq_module(fake_ldr_process, mod_id,
+			&first_lm.module_info, sizeof(ldr_module_info_t),
+			&retsize) != 0)
+    return lm;
+#else
+  CORE_ADDR ldr_context_addr;
+
+  if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
+			  (char *) &ldr_context_addr,
+			  sizeof (CORE_ADDR)) != 0
+      || target_read_memory (ldr_context_addr,
+			     (char *) &ldr_context,
+			     sizeof (ldr_context_t)) != 0
+      || target_read_memory ((CORE_ADDR) ldr_context.head,
+			     (char *) &first_lm.module_info,
+			     sizeof (ldr_module_info_t)) != 0)
+    return lm;
+#endif
+
+  lm = &first_lm;
+
+  /* The first entry is for the main program and should be skipped.  */
+  lm->l_name = NULL;
+
+  return lm;
+}
+
+static struct link_map *
+next_link_map_member (so_list_ptr)
+     struct so_list *so_list_ptr;
+{
+  struct link_map *lm = NULL;
+  static struct link_map next_lm;
+#ifdef USE_LDR_ROUTINES
+  ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid;
+  size_t retsize;
+
+  if (ldr_next_module(fake_ldr_process, &mod_id) != 0
+      || mod_id == LDR_NULL_MODULE
+      || ldr_inq_module(fake_ldr_process, mod_id,
+			&next_lm.module_info, sizeof(ldr_module_info_t),
+			&retsize) != 0)
+    return lm;
+
+  lm = &next_lm;
+  lm->l_name = lm->module_info.lmi_name;
+#else
+  CORE_ADDR ldr_context_addr;
+
+  /* Reread context in case ldr_context.tail was updated.  */
+
+  if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
+			  (char *) &ldr_context_addr,
+			  sizeof (CORE_ADDR)) != 0
+      || target_read_memory (ldr_context_addr,
+			     (char *) &ldr_context,
+			     sizeof (ldr_context_t)) != 0
+      || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
+      || target_read_memory (so_list_ptr->lm.module_info.next,
+			     (char *) &next_lm.module_info,
+			     sizeof (ldr_module_info_t)) != 0)
+    return lm;
+
+  lm = &next_lm;
+  lm->l_name = lm->module_info.module_name;
+#endif
+  return lm;
+}
+
+static void
+xfer_link_map_member (so_list_ptr, lm)
+     struct so_list *so_list_ptr;
+     struct link_map *lm;
+{
+  int i;
+  so_list_ptr->lm = *lm;
+
+  /* OSF/1 shared libraries are pre-linked to particular addresses,
+     but the runtime loader may have to relocate them if the
+     address ranges of the libraries used by the target executable clash,
+     or if the target executable is linked with the -taso option.
+     The offset is the difference between the address where the shared
+     library is mapped and the pre-linked address of the shared library.
+
+     FIXME:  GDB is currently unable to relocate the shared library
+     sections by different offsets. If sections are relocated by
+     different offsets, put out a warning and use the offset of the
+     first section for all remaining sections.  */
+  LM_OFFSET (so_list_ptr) = 0;
+
+  /* There is one entry that has no name (for the inferior executable)
+     since it is not a shared object. */
+  if (LM_NAME (so_list_ptr) != 0)
+    {
+
+#ifdef USE_LDR_ROUTINES
+      int len = strlen (LM_NAME (so_list_ptr) + 1);
+
+      if (len > MAX_PATH_SIZE)
+	len = MAX_PATH_SIZE;
+      strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
+      so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
+
+      for (i = 0; i < lm->module_info.lmi_nregion; i++)
+	{
+	  ldr_region_info_t region_info;
+	  size_t retsize;
+	  CORE_ADDR region_offset;
+
+	  if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid,
+			      i, &region_info, sizeof (region_info),
+			      &retsize) != 0)
+	    break;
+	  region_offset = (CORE_ADDR) region_info.lri_mapaddr
+			  - (CORE_ADDR) region_info.lri_vaddr;
+	  if (i == 0)
+	    LM_OFFSET (so_list_ptr) = region_offset;
+	  else if (LM_OFFSET (so_list_ptr) != region_offset)
+	    warning ("cannot handle shared library relocation for %s (%s)",
+		     so_list_ptr->so_name, region_info.lri_name);
+	}
+#else
+      int errcode;
+      char *buffer;
+      target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
+			  MAX_PATH_SIZE - 1, &errcode);
+      if (errcode != 0)
+	error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
+	       safe_strerror (errcode));
+      strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
+      free (buffer);
+      so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
+
+      for (i = 0; i < lm->module_info.region_count; i++)
+	{
+	  ldr_region_info_t region_info;
+	  CORE_ADDR region_offset;
+
+	  if (target_read_memory (lm->module_info.regioninfo_addr
+				   + i * sizeof (region_info),
+				  (char *) &region_info,
+				  sizeof (region_info)) != 0)
+	    break;
+	  region_offset = region_info.mapaddr - region_info.vaddr;
+	  if (i == 0)
+	    LM_OFFSET (so_list_ptr) = region_offset;
+	  else if (LM_OFFSET (so_list_ptr) != region_offset)
+	    {
+	      char *region_name;
+	      target_read_string (region_info.regionname_addr, &buffer,
+				  MAX_PATH_SIZE - 1, &errcode);
+	      if (errcode == 0)
+		region_name = buffer;
+	      else
+		region_name = "??";
+	      warning ("cannot handle shared library relocation for %s (%s)",
+		        so_list_ptr->so_name, region_name);
+	      free (buffer);
+	    }
+	}
+#endif
+
+      catch_errors (solib_map_sections, (char *) so_list_ptr,
+		    "Error while mapping shared library sections:\n",
+		    RETURN_MASK_ALL);
+    }
+}
+
+/*
+
+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)
+	{
+	  /* Find 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. */
+      lm = next_link_map_member (so_list_ptr);
+      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;
+	}      
+      so_list_next = new;
+      xfer_link_map_member (new, lm);
+    }
+  return (so_list_next);
+}
+
+/* A small stub to get us past the arg-passing pinhole of catch_errors.  */
+
+static int
+symbol_add_stub (arg)
+     char *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) + LM_OFFSET (so);
+    }
+  
+  so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
+				   text_addr,
+				   0, 0, 0, 0, 1);
+  return (1);
+}
+
+/*
+
+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])
+	    {
+	      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.  */
+  so = NULL;
+  while ((so = find_solib (so)) != NULL)
+    {
+      if (so -> so_name[0] && re_exec (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, (char *) 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 ();
+}
+
+/*
+
+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;
+  
+  if (exec_bfd == NULL)
+    {
+      printf_unfiltered ("No exec file.\n");
+      return;
+    }
+  while ((so = find_solib (so)) != NULL)
+    {
+      if (so -> so_name[0])
+	{
+	  unsigned long txt_start = 0;
+	  unsigned long txt_end = 0;
+
+	  if (!header_done)
+	    {
+	      printf_unfiltered("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
+		     "Shared Object Library");
+	      header_done++;
+	    }
+	  if (so -> textsection)
+	    {
+	      txt_start = (unsigned long) so -> textsection -> addr;
+	      txt_end = (unsigned long) so -> textsection -> endaddr;
+	    }
+	  printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
+	  printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
+	  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] && so -> textsection)
+	{
+	  if ((address >= (CORE_ADDR) so -> textsection -> addr) &&
+	      (address < (CORE_ADDR) so -> textsection -> endaddr))
+	    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;
+    }
+}
+  
+/*
+  
+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 a statically bound executable, this first instruction is the
+	one at "_start", or a similar text label. No further processing is
+	needed in that case.
+	For a dynamically bound executable, this first instruction is somewhere
+	in the rld, and the actual user executable is not yet mapped in.
+	We continue the inferior again, rld then maps in the actual user
+	executable and any needed shared libraries and then sends
+	itself a SIGTRAP.
+	At that point we discover the names of all shared libraries and
+	read their symbols in.
+
+FIXME
+
+	This code does not properly handle hitting breakpoints which the
+	user might have set in the rld itself.  Proper handling would have
+	to check if the SIGTRAP happened due to a kill call.
+
+	Also, what if child has exit()ed?  Must exit loop somehow.
+  */
+
+void
+solib_create_inferior_hook()
+{
+
+  /* Nothing to do for statically bound executables.  */
+
+  if (symfile_objfile == NULL
+      || symfile_objfile->obfd == NULL
+      || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
+    return;
+
+  /* Now run the target.  It will eventually get a SIGTRAP, at
+     which point all of the libraries will have been mapped in and we
+     can go groveling around in the rld 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);
+
+  /*  solib_add will call reinit_frame_cache.
+      But we are stopped in the runtime loader and we do not have symbols
+      for the runtime loader. So heuristic_proc_start will be called
+      and will put out an annoying warning.
+      Delaying the resetting of stop_soon_quietly until after symbol loading
+      suppresses the warning.  */
+  if (auto_solib_add)
+    solib_add ((char *) 0, 0, (struct target_ops *) 0);
+  stop_soon_quietly = 0;
+}
+
+
+/*
+
+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);
+}
+
+void
+_initialize_solib()
+{
+  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);
+}