* somsolib.c: Add TODO list.

	(som_solib_add): Immediately return if $SHLIB_INFO$ sections does
	not exist or has size zero.  Slightly simplify error handling.
	Keep an internal list of all the loaded shared libraries and
	various tidbits of information about the loaded shared libraries.
	Build section tables for each loaded shared library and add those
	tables to the core target if necessary.
	(som_solib_create_inferior_hook): Force re-reading of shared
	libraries at exec time.
	(som_sharedlibrary_info_command): New function for dumping
	information about the currently loaded shared libraries.
	(_initialize_som_solib): New function.

1 files changed, 280 insertions, 36 deletions

diff --git a/gdb/somsolib.c b/gdb/somsolib.c
index 0418bd9..f75ad9c 100644
--- a/gdb/somsolib.c
+++ b/gdb/somsolib.c
@@ -1,6 +1,6 @@
 /* Handle HP SOM shared libraries for GDB, the GNU Debugger.
    Copyright 1993 Free Software Foundation, Inc.
-   
+
 This file is part of GDB.
 
 This program is free software; you can redistribute it and/or modify
@@ -34,16 +34,31 @@ and by Cygnus Support.  */
 #include "objfiles.h"
 #include "inferior.h"
 
-/* We don't currently use this structure, but it isn't documented anywhere,
-   and we'll likely need it in som_solib_add as more shared library support
-   is added.  */
+/* TODO:
+
+   * Relocate data addresses in the shared library.
+
+   * Most of this code should work for hp300 shared libraries.  Does
+   anyone care enough to weed out any SOM-isms.
+
+   * Do we need/want a command to load a shared library?
+
+   * Test attaching to running dynamically linked code.
+
+   * Support for hpux8 dynamic linker.
+
+   * Support for tracking user calls to dld_load, dld_unload.  */
+
+/* The basic structure which describes a dynamically loaded object.  This
+   data structure is private to the dynamic linker and isn't found in
+   any HPUX include file.  */
 
 struct som_solib_mapped_entry
 {
   /* The name of the library.  */
   char *name;
 
-  /* Version of this structure (it is expected to change again in hpux10.  */
+  /* Version of this structure (it is expected to change again in hpux10).  */
   unsigned char struct_version;
 
   /* Binding mode for this library.  */
@@ -72,6 +87,21 @@ struct som_solib_mapped_entry
      contained in them.  */
 };
 
+/* A structure to keep track of all the known shared objects.  */
+struct so_list
+{
+  struct som_solib_mapped_entry som_solib;
+  struct objfile *objfile;
+  bfd *abfd;
+  struct section_table *sections;
+  struct section_table *sections_end;
+  struct so_list *next;
+};
+
+static struct so_list *so_list_head;
+
+static void som_sharedlibrary_info_command PARAMS ((char *, int));
+
 /* Add symbols from shared libraries into the symtab list.  */
 
 void
@@ -79,9 +109,11 @@ som_solib_add (arg_string, from_tty, target)
      char *arg_string;
      int from_tty;
      struct target_ops *target;
-{	
+{
   struct minimal_symbol *msymbol;
+  struct so_list *so_list_tail;
   CORE_ADDR addr;
+  asection *shlib_info;
   int status;
   unsigned int dld_flags;
   char buf[4];
@@ -90,9 +122,21 @@ som_solib_add (arg_string, from_tty, target)
      process, then som_solib_create_inferior_hook will not have been
      called.
 
-     We need to examine __dld_flags to determine if the shared library
-     list is valid, and to determine if the libraries have been privately
+     We need to first determine if we're dealing with a dynamically
+     linked executable.  If not, then return without an error or warning.
+
+     We also need to examine __dld_flags to determine if the shared library
+     list is valid and to determine if the libraries have been privately
      mapped.  */
+  /* First see if the objfile was dynamically linked.  */
+  shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
+  if (!shlib_info)
+    return;
+
+  /* It's got a $SHLIB_INFO$ section, make sure it's not empty.  */
+  if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0)
+    return;
+
   msymbol = lookup_minimal_symbol ("__dld_flags", (struct objfile *) NULL);
   if (msymbol == NULL)
     {
@@ -119,7 +163,7 @@ som_solib_add (arg_string, from_tty, target)
 
   /* If the libraries were not mapped private, warn the user.  */
   if ((dld_flags & 1) == 0)
-    warning ("The shared libraries were not privately mapped;\nsetting a breakpoint in a shared library will not work.\n");
+    warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n");
 
   msymbol = lookup_minimal_symbol ("__dld_list", (struct objfile *) NULL);
   if (!msymbol)
@@ -173,37 +217,39 @@ som_solib_add (arg_string, from_tty, target)
      Skip the first entry since it's our executable.  */
   status = target_read_memory (addr + 36, buf, 4);
   if (status != 0)
-    {
-      error ("Error while reading dynamic library list.\n");
-      return;
-    }
+    goto err;
+
   addr = extract_unsigned_integer (buf, 4);
 
+  so_list_tail = so_list_head;
+  /* Find the end of the list of shared objects.  */
+  while (so_list_tail && so_list_tail->next)
+    so_list_tail = so_list_tail->next;
+
   while (1)
     {
       CORE_ADDR name_addr, text_addr;
       unsigned int name_len;
       char *name;
+      struct so_list *new_so;
+      struct section_table *p;
+
       if (addr == 0)
 	break;
 
       /* Get a pointer to the name of this library.  */
       status = target_read_memory (addr, buf, 4);
       if (status != 0)
-	{
-	  error ("Error while reading dynamic library list.\n");
-	  return;
-	}
+	goto err;
+
       name_addr = extract_unsigned_integer (buf, 4);
       name_len = 0;
       while (1)
 	{
 	  target_read_memory (name_addr + name_len, buf, 1);
 	  if (status != 0)
-	    {
-	      error ("Error while reading dynamic library list.\n");
-	      return;
-	    }
+	    goto err;
+
 	  name_len++;
 	  if (*buf == '\0')
 	    break;
@@ -211,32 +257,159 @@ som_solib_add (arg_string, from_tty, target)
       name = alloca (name_len);
       status = target_read_memory (name_addr, name, name_len);
       if (status != 0)
-	{
-	  error ("Error while reading dynamic library list.\n");
-	  return;
-	}
+	goto err;
+
       name = obsavestring (name, name_len - 1,
 			   &symfile_objfile->symbol_obstack);
 
       status = target_read_memory (addr + 8, buf, 4);
       if (status != 0)
+	goto err;
+
+      text_addr = extract_unsigned_integer (buf, 4);
+
+
+      new_so = (struct so_list *) malloc (sizeof (struct so_list));
+      memset ((char *)new_so, 0, sizeof (struct so_list));
+      if (so_list_head == NULL)
 	{
-	  error ("Error while reading dynamic library list.\n");
-	  return;
+	  so_list_head = new_so;
+	  so_list_tail = new_so;
 	}
-      text_addr = extract_unsigned_integer (buf, 4);
+      else
+	{
+	  so_list_tail->next = new_so;
+	  so_list_tail = new_so;
+	}
+
+      /* Fill in all the entries in GDB's shared library list.  */
+      new_so->som_solib.name = name;
+      status = target_read_memory (addr + 4, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.struct_version = extract_unsigned_integer (buf + 3, 1);
+      new_so->som_solib.bind_mode = extract_unsigned_integer (buf + 2, 1);
+      new_so->som_solib.library_version = extract_unsigned_integer (buf, 2);
+      new_so->som_solib.text_addr = text_addr;
+
+      status = target_read_memory (addr + 12, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.text_link_addr = extract_unsigned_integer (buf, 4);
 
-      /* OK, we've got everything we need.  Tell GDB about it.  */
-      symbol_file_add (name, from_tty, text_addr, 0, 0, 0);
+      status = target_read_memory (addr + 16, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.text_end = extract_unsigned_integer (buf, 4);
+
+      status = target_read_memory (addr + 20, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.data_start = extract_unsigned_integer (buf, 4);
+
+      status = target_read_memory (addr + 24, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.bss_start = extract_unsigned_integer (buf, 4);
+
+      status = target_read_memory (addr + 28, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.data_end = extract_unsigned_integer (buf, 4);
+
+      status = target_read_memory (addr + 32, buf, 4);
+      if (status != 0)
+	goto err;
+
+      new_so->som_solib.got_value = extract_unsigned_integer (buf, 4);
 
-      /* Get address of the next record.  */
       status = target_read_memory (addr + 36, buf, 4);
       if (status != 0)
+	goto err;
+
+      new_so->som_solib.next = (void *)extract_unsigned_integer (buf, 4);
+      addr = (CORE_ADDR)new_so->som_solib.next;
+
+      new_so->objfile = symbol_file_add (name, from_tty, text_addr, 0, 0, 0);
+      new_so->abfd = bfd_openr (name, gnutarget);
+      new_so->abfd->cacheable = true;
+
+      if (!bfd_check_format (new_so->abfd, bfd_object))
+	{
+	  error ("\"%s\": not in executable format: %s.",
+		 name, bfd_errmsg (bfd_get_error ()));
+	}
+
+      /* Now we need to build a section table for this library since
+	 we might be debugging a core file from a dynamically linked
+	 executable in which the libraries were not privately mapped.  */
+      if (build_section_table (new_so->abfd,
+			       &new_so->sections,
+			       &new_so->sections_end))
 	{
-	  error ("Error while reading dynamic library list.\n");
+	  error ("Unable to build section table for shared library\n.");
 	  return;
 	}
-      addr = extract_unsigned_integer (buf, 4);
+
+      /* Relocate all the sections based on where they got loaded.  */
+      for (p = new_so->sections; p < new_so->sections_end; p++)
+	{
+	  if (p->the_bfd_section->flags & SEC_CODE)
+	    {
+	      p->addr += text_addr - new_so->som_solib.text_link_addr;
+	      p->endaddr += text_addr - new_so->som_solib.text_link_addr;
+	    }
+	  else if (p->the_bfd_section->flags & SEC_DATA)
+	    {
+	      p->addr += new_so->som_solib.data_start;
+	      p->endaddr += new_so->som_solib.data_start;
+	    }
+	}
+
+      /* Now see if we need to map in the text and data for this shared
+	 library (for example debugging a core file which does not use
+	 private shared libraries.). 
+
+	 Carefully peek at the first text address in the library.  If the
+	 read succeeds, then the libraries were privately mapped and were
+	 included in the core dump file.
+
+	 If the peek failed, then the libraries were not privately mapped
+	 and are not in the core file, we'll have to read them in ourselves.  */
+      status = target_read_memory (text_addr, buf, 4);
+      if (status != 0)
+	{
+	  int old;
+
+	  /* Add sections from the shared library to the core target.  */
+	  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))
+			    * (old + bfd_count_sections (new_so->abfd))));
+	    }
+	  else
+	    {
+	      old = 0;
+	      target->to_sections = (struct section_table *)
+		xmalloc ((sizeof (struct section_table))
+			 * bfd_count_sections (new_so->abfd));
+	    }
+	  target->to_sections_end = (target->to_sections
+				+ old + bfd_count_sections (new_so->abfd));
+	  memcpy ((char *)(target->to_sections + old),
+		  new_so->sections,
+		  ((sizeof (struct section_table))
+		   * bfd_count_sections (new_so->abfd)));
+	}
     }
 
   /* Getting new symbols may change our opinion about what is
@@ -247,8 +420,13 @@ som_solib_add (arg_string, from_tty, target)
 old_dld:
   error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n");
   return;
+
+err:
+  error ("Error while reading dynamic library list.\n");
+  return;
 }
 
+
 /* This hook gets called just before the first instruction in the
    inferior process is executed.
 
@@ -268,13 +446,13 @@ old_dld:
    Note that shared libraries are not mapped in at this time, so we have
    run the inferior until the libraries are mapped in.  Typically this
    means running until the "_start" is called.  */
-   
-void 
+
+void
 som_solib_create_inferior_hook()
 {
   struct minimal_symbol *msymbol;
-  asection *shlib_info;
   unsigned int dld_flags, status;
+  asection *shlib_info;
   char shadow_contents[BREAKPOINT_MAX], buf[4];
   CORE_ADDR anaddr;
 
@@ -331,6 +509,18 @@ som_solib_create_inferior_hook()
       return;
     }
 
+  /* Wipe out all knowledge of old shared libraries since their
+     mapping can change from one exec to another!  */
+  while (so_list_head)
+    {
+      struct so_list *temp;
+
+      free_objfile (so_list_head->objfile);
+      temp = so_list_head;
+      free (so_list_head);
+      so_list_head = temp->next;
+    }
+
   /* Start the process again and wait for it to hit our breakpoint.  */
   clear_proceed_status ();
   stop_soon_quietly = 1;
@@ -353,3 +543,57 @@ som_solib_create_inferior_hook()
 
   som_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 }
+
+/* Dump information about all the currently loaded shared libraries.  */
+
+static void
+som_sharedlibrary_info_command (ignore, from_tty)
+     char *ignore;
+     int from_tty;
+{
+  struct so_list *so_list = so_list_head;
+
+  if (exec_bfd == NULL)
+    {
+      printf_unfiltered ("no exec file.\n");
+      return;
+    }
+
+  if (so_list == NULL)
+    {
+      printf_unfiltered ("No shared libraries loaded at this time.\n");
+      return;
+    }
+
+  printf_unfiltered ("Shared Object Libraries\n");
+  printf_unfiltered ("    %-12s%-12s%-12s%-12s%-12s%-12s\n",
+		     "  flags", "  tstart", "   tend", "  dstart", "   dend", "   dlt");
+  while (so_list)
+    {
+      unsigned int flags;
+
+      flags = so_list->som_solib.struct_version << 24;
+      flags |= so_list->som_solib.bind_mode << 16;
+      flags |= so_list->som_solib.library_version;
+      printf_unfiltered ("%s\n", so_list->som_solib.name);
+      printf_unfiltered ("    %-12s", local_hex_string_custom (flags, "08l"));
+      printf_unfiltered ("%-12s",
+	      local_hex_string_custom (so_list->som_solib.text_addr, "08l"));
+      printf_unfiltered ("%-12s",
+	      local_hex_string_custom (so_list->som_solib.text_end, "08l"));
+      printf_unfiltered ("%-12s",
+	      local_hex_string_custom (so_list->som_solib.data_start, "08l"));
+      printf_unfiltered ("%-12s",
+	      local_hex_string_custom (so_list->som_solib.data_end, "08l"));
+      printf_unfiltered ("%-12s\n",
+	      local_hex_string_custom (so_list->som_solib.got_value, "08l"));
+      so_list = so_list->next;
+    }
+}
+
+void
+_initialize_som_solib ()
+{
+  add_info ("sharedlibrary", som_sharedlibrary_info_command,
+	    "Status of loaded shared object libraries.");
+}