nextstep-nat-dyld.c   [plain text]

#include <unistd.h>
#include <ctype.h>
#include <mach/mach_types.h>
#include <mach/vm_types.h>
#include <mach/vm_region.h>
#include <mach/machine/vm_param.h>

#include "defs.h"
#include "inferior.h"
#include "target.h"
#include "gdbcmd.h"
#include "annotate.h"
#include "mach-o.h"
#include "gdbcore.h"                /* for core_ops */
#include "symfile.h"
#include "objfiles.h"

#include "nextstep-nat-dyld.h"
#include "nextstep-nat-dyld-path.h"
#include "nextstep-nat-inferior.h"
#include "nextstep-nat-inferior-debug.h"
#include "nextstep-nat-mutils.h"
#include "nextstep-nat-dyld.h"
#include "nextstep-nat-dyld-info.h"
#include "nextstep-nat-dyld-path.h"
#include "nextstep-nat-dyld-process.h"

#if WITH_CFM
#include "nextstep-nat-cfm.h"
#endif /* WITH_CFM */

FILE *dyld_stderr = NULL;
int dyld_debug_flag = 0;

/* These two record where we actually found dyld.  We need to do this 
   detection before we build all the data structures for shared libraries,
   so we need to keep it around on the side. */

CORE_ADDR dyld_addr = 0;
CORE_ADDR dyld_slide = 0;

extern int inferior_auto_start_cfm_flag;

static int dyld_starts_here_p (vm_address_t addr);
static void next_locate_dyld (bfd *exec_bfd);

void dyld_debug (const char *fmt, ...)
{
  va_list ap;
  if (dyld_debug_flag >= 1) {
    va_start (ap, fmt);
    fprintf (dyld_stderr, "[%d dyld]: ", getpid ());
    vfprintf (dyld_stderr, fmt, ap);
    va_end (ap);
    fflush (dyld_stderr);
  }
}

bfd *sym_bfd;

extern struct target_ops exec_ops;

extern next_inferior_status *next_status;

int dyld_preload_libraries_flag = 1;
int dyld_filter_events_flag = 1;
int dyld_always_read_from_memory_flag = 0;
char *dyld_symbols_prefix = "__dyld_";
int dyld_load_dyld_symbols_flag = 1;
int dyld_load_dyld_shlib_symbols_flag = 1;
int dyld_load_cfm_shlib_symbols_flag = 1;
int dyld_print_basenames_flag = 0;
char *dyld_load_rules = NULL;
char *dyld_minimal_load_rules = NULL;

int next_dyld_update ();

const char
*dyld_debug_error_string (enum dyld_debug_return ret)
{
  switch (ret) {
  case DYLD_SUCCESS: return "DYLD_SUCCESS";
  case DYLD_INCONSISTENT_DATA: return "DYLD_INCONSISTENT_DATA";
  case DYLD_INVALID_ARGUMENTS: return "DYLD_INVALID_ARGUMENTS";
  case DYLD_FAILURE: return "DYLD_FAILURE";
  default: return "[UNKNOWN]";
  }  
}

const char
*dyld_debug_event_string (enum dyld_event_type type)
{
  switch (type) {
  case DYLD_IMAGE_ADDED: return "DYLD_IMAGE_ADDED";
  case DYLD_MODULE_BOUND: return "DYLD_MODULE_BOUND";
  case DYLD_MODULE_REMOVED: return "DYLD_MODULE_REMOVED";
  case DYLD_MODULE_REPLACED: return "DYLD_MODULE_REPLACED";
  case DYLD_PAST_EVENTS_END: return "DYLD_PAST_EVENTS_END";
  case DYLD_IMAGE_REMOVED: return "DYLD_IMAGE_REMOVED";
  default: return "[UNKNOWN]";
  }
}

static void
debug_dyld_event_request (FILE *f, struct _dyld_event_message_request *request)
{
  next_debug_message (&request->head);
  fprintf (f, "               type: %s (0x%lx)\n",
              dyld_debug_event_string (request->event.type),
              (unsigned long) request->event.type);
  fprintf (f, "arg[0].vmaddr_slide: 0x%lx\n", (unsigned long) request->event.arg[0].vmaddr_slide);
  fprintf (f, "arg[0].module_index: 0x%lx\n", (unsigned long) request->event.arg[0].module_index);
  fprintf (f, "arg[1].vmaddr_slide: 0x%lx\n", (unsigned long) request->event.arg[1].vmaddr_slide);
  fprintf (f, "arg[1].module_index: 0x%lx\n", (unsigned long) request->event.arg[1].module_index);
}

void
dyld_print_status_info (struct next_dyld_thread_status *s, unsigned int mask)
{
  switch (s->state) {
  case dyld_clear:
    ui_out_text (uiout, "The DYLD shared library state has not yet been initialized.\n");
    break;
  case dyld_initialized:
    ui_out_text (uiout,
       "The DYLD shared library state has been initialized from the "
       "executable's shared library information.  All symbols should be "
       "present, but the addresses of some symbols may move when the program "
       "is executed, as DYLD may relocate library load addresses if "
       "necessary.\n");
    break;
  case dyld_started:
    ui_out_text (uiout, "DYLD shared library information has been read from the DYLD debugging thread.\n");
    break;
  default:
    internal_error (__FILE__, __LINE__, "invalid value for s->dyld_state");
    break;
  }

  dyld_print_shlib_info (&s->current_info, mask);
}

void
next_clear_start_breakpoint ()
{
  remove_solib_event_breakpoints ();
}

extern char *dyld_symbols_prefix;

static
CORE_ADDR lookup_dyld_address (const char *s)
{
  struct minimal_symbol *msym = NULL;
  CORE_ADDR sym_addr;
  char *ns = NULL;

  asprintf (&ns, "%s%s", dyld_symbols_prefix, s);
  msym = lookup_minimal_symbol (ns, NULL, NULL);
  xfree (ns);

  if (msym == NULL) {
    error ("unable to locate symbol \"%s%s\"", dyld_symbols_prefix, s);
  }
  sym_addr = SYMBOL_VALUE_ADDRESS (msym);
  return sym_addr + dyld_slide;
}

static
unsigned int lookup_dyld_value (const char *s)
{
  return read_memory_unsigned_integer (lookup_dyld_address (s), 4);
}

void
next_init_addresses ()
{
  
  next_status->dyld_status.object_images = lookup_dyld_address ("object_images");
  next_status->dyld_status.library_images = lookup_dyld_address ("library_images");
  next_status->dyld_status.state_changed_hook 
    = lookup_dyld_address ("gdb_dyld_state_changed");

  next_status->dyld_status.dyld_version = lookup_dyld_value ("gdb_dyld_version");

  next_status->dyld_status.nobject_images = lookup_dyld_value ("gdb_nobject_images");
  next_status->dyld_status.nlibrary_images = lookup_dyld_value ("gdb_nlibrary_images");
  next_status->dyld_status.object_image_size = lookup_dyld_value ("gdb_object_image_size");
  next_status->dyld_status.library_image_size = lookup_dyld_value ("gdb_library_image_size");
}

static int
dyld_starts_here_p (vm_address_t addr)
{
  vm_address_t address =  addr;
  vm_size_t size = 0;
  vm_region_basic_info_data_64_t info;
  mach_msg_type_number_t info_cnt;
  kern_return_t ret;
  mach_port_t object_name;
  vm_address_t data;
  vm_size_t data_count;

  struct mach_header *mh;

  info_cnt = VM_REGION_BASIC_INFO_COUNT;
  ret = vm_region (next_status->task, &address, &size, VM_REGION_BASIC_INFO,
		  (vm_region_info_t) &info, &info_cnt, &object_name);

  if (ret != KERN_SUCCESS) {
    return 0;
  }

  /* If it is not readable, it is not dyld. */
  
  if ((info.protection & VM_PROT_READ) == 0) {
    return 0; 
  }

  ret = vm_read (next_status->task, address, size, &data, &data_count);

  if (ret != KERN_SUCCESS) {
    ret = vm_deallocate (mach_task_self (), data, data_count);
    return 0; 
  }

  /* If the vm region is too small to contain a mach_header, it also can't be
     where dyld is loaded */

  if (data_count < sizeof (struct mach_header)){
    ret = vm_deallocate (mach_task_self (), data, data_count);
    return 0;
  }

  mh = (struct mach_header *) data;

  /* If the magic number is right and the size of this
   * region is big enough to cover the mach header and
   * load commands assume it is correct.
   */

  if (mh->magic != MH_MAGIC ||
      mh->filetype != MH_DYLINKER ||
      data_count < sizeof (struct mach_header) +
      mh->sizeofcmds) {
    ret = vm_deallocate (mach_task_self (), data, data_count);
    return 0;
  }

  /* Looks like dyld! */
  ret = vm_deallocate(mach_task_self(), data, data_count);

  return 1;
}

/*
 * next_locate_dyld - This is set to the SOLIB_ADD
 *   macro in nm-nextstep.h, and called when have created the
 *   inferior and are about to run it.  It locates the dylinker 
 *   in the executable, and updates the dyld part of our data
 *   structures.
 */

static void
next_locate_dyld (bfd *exec_bfd)
{
  char *dyld_name = NULL;
  CORE_ADDR dyld_default_addr = 0x0;
  int got_default_address;
  struct cleanup *old_cleanups = NULL;
  struct mach_o_data_struct *mdata = NULL;
  unsigned int i;
  struct objfile *objfile;

  CHECK_FATAL (next_status != NULL);

  /* Find where dyld is located in this binary.  We proceed in three steps.  

     First we read the load commands of the executable to find the objfile 
     for the dylinker.  If we can't find the exec_bfd (for instance if you
     do attach without pointing gdb at the executable), we default to
     /usr/lib/dyld.

     Then we find the default load address from the dylinker.

     Finally we see if the dylinker is in fact loaded there, and
     if not, look through the mapped regions until we find it. 
  */

  if (exec_bfd != NULL)
    {
      mdata = exec_bfd->tdata.mach_o_data;
      if (mdata == NULL)
	error ("next_set_start_breakpoint: target data for exec bfd == NULL\n");
      
      for (i = 0; i < mdata->header.ncmds; i++) 
	{
	  struct bfd_mach_o_load_command *cmd = &mdata->commands[i];
	  
	  if (cmd->type == BFD_MACH_O_LC_LOAD_DYLINKER)
	    {
	      bfd_mach_o_dylinker_command *dcmd = &cmd->command.dylinker;
	      
	      dyld_name = xmalloc (dcmd->name_len + 1);
	      
	      bfd_seek (exec_bfd, dcmd->name_offset, SEEK_SET);
	      if (bfd_bread (dyld_name, dcmd->name_len, exec_bfd) != dcmd->name_len) 
		{
		  warning ("Unable to find library name for LC_LOAD_DYLINKER or LD_ID_DYLINKER command; ignoring");
		  xfree (dyld_name);
		  continue;
		}
	      else
		{
		  old_cleanups = make_cleanup (xfree, dyld_name);
		  break;
		}
	    }
	}
    }
  
  /* If for some reason we can't find  the name, look for it with the
     default name. */
  
  if (dyld_name == NULL)
    dyld_name = "/usr/lib/dyld";
  
  /* Okay, we have found the name of the dylinker, now let's find the objfile 
     associated with it... */
  
  got_default_address = 0;
  
  ALL_OBJFILES (objfile)
    {
      if (strcmp (dyld_name, objfile->name) == 0) 
	{
	  asection *text_section 
	    = bfd_get_section_by_name (objfile->obfd, "LC_SEGMENT.__TEXT");
	  dyld_default_addr = bfd_section_vma (objfile->obfd, text_section);
	  got_default_address = 1;
	  break;
	}
    }
  
  if (!got_default_address)
    error ("next_set_start_breakpoint: Couldn't find address of dylinker: %s.",
	   dyld_name);
  
  /* Now let's see if dyld is at its default address: */
  
  if (dyld_starts_here_p (dyld_default_addr))
    {
      dyld_addr = dyld_default_addr;
      dyld_slide = 0;
    }
  else
    {
      kern_return_t ret_val;
      vm_region_basic_info_data_t info;
      int info_cnt;
      vm_address_t test_addr = VM_MIN_ADDRESS;
      vm_size_t size;
      mach_port_t object_name;
      task_t target_task = next_status->task;
      
      do 
	{
	  ret_val = vm_region (target_task, &test_addr, 
			       &size, VM_REGION_BASIC_INFO,
			       (vm_region_info_t) &info, &info_cnt, 
			       &object_name);
	  
	  if (ret_val != KERN_SUCCESS) {
	    /* Implies end of vm_region, usually. */
	    break;
	  }
	  
	  if (dyld_starts_here_p (test_addr))
	    {
	      dyld_addr = test_addr;
	      dyld_slide = test_addr - dyld_default_addr;
	      break;
	    }
	  
	  test_addr += size;
	  
	} while (size != 0);
    }
  
  if (old_cleanups)
    do_cleanups (old_cleanups);

}

void
next_set_start_breakpoint (bfd *exec_bfd)
{
  struct breakpoint *b;
  struct symtab_and_line sal;
  char *ns = NULL;

  asprintf (&ns, "%s%s", dyld_symbols_prefix, "gdb_dyld_state_changed");
 
  next_locate_dyld (exec_bfd);
  next_init_addresses ();

  INIT_SAL (&sal);
  sal.pc = next_status->dyld_status.state_changed_hook;
  b = set_momentary_breakpoint (sal, NULL, bp_shlib_event);
  b->disposition = disp_donttouch;
  b->thread = -1;
  b->addr_string = ns;

  breakpoints_changed ();

}

int
next_mach_try_start_dyld ()
{
  CHECK_FATAL (next_status != NULL);

  return next_dyld_update (0);
}

static
void info_dyld_command (char *args, int from_tty)
{
  CHECK_FATAL (next_status != NULL);
  dyld_print_status_info (&next_status->dyld_status, dyld_reason_dyld);
}

static
void info_sharedlibrary_command (char *args, int from_tty)
{
  CHECK_FATAL (next_status != NULL);
  dyld_print_status_info (&next_status->dyld_status, dyld_reason_all);
}

void
next_mach_add_shared_symbol_files ()
{
  struct dyld_objfile_info *result = NULL;
 
  CHECK_FATAL (next_status != NULL);
  result = &next_status->dyld_status.current_info;

  dyld_load_libraries (&next_status->dyld_status.path_info, result);

  update_section_tables (&current_target);
  update_section_tables (&exec_ops);

  reread_symbols ();
  breakpoint_re_set ();
  re_enable_breakpoints_in_shlibs (0);
}

void
next_init_dyld (struct next_dyld_thread_status *s, struct objfile *o)
{
  struct dyld_objfile_info previous_info, new_info;

  dyld_init_paths (&s->path_info);

  dyld_objfile_info_init (&previous_info);
  dyld_objfile_info_init (&new_info);

  dyld_objfile_info_copy (&previous_info, &s->current_info);
  dyld_objfile_info_free (&s->current_info);

  if (dyld_preload_libraries_flag) {
    dyld_add_inserted_libraries (&s->current_info, &s->path_info);
    if ((o != NULL) && (o->obfd != NULL)) {
      dyld_add_image_libraries (&s->current_info, o->obfd);
    }
  }

  {
    struct dyld_objfile_entry *e;
    e = dyld_objfile_entry_alloc (&s->current_info);
    e->text_name_valid = 1;
    e->reason = dyld_reason_executable;
    if (o  != NULL)
      {
        e->objfile = o;
        e->load_flag = o->symflags;
        if (o->obfd != NULL)
          {
            e->text_name = xstrdup (bfd_get_filename (o->obfd));
            e->abfd = o->obfd;
          }
      }
    e->loaded_from_memory = 0;
    e->loaded_name = e->text_name;
    e->loaded_addr = 0;
    e->loaded_addrisoffset = 1;
  }

  dyld_update_shlibs (s, &s->path_info, &previous_info, &s->current_info, &new_info);
  dyld_objfile_info_free (&previous_info);
 
  dyld_objfile_info_copy (&s->current_info, &new_info);
  dyld_objfile_info_free (&new_info);

  s->state = dyld_initialized;
}

void
next_init_dyld_symfile (struct objfile *o)
{
  CHECK_FATAL (next_status != NULL);
  next_init_dyld (&next_status->dyld_status, o);
}

static
void next_dyld_init_command (char *args, int from_tty)
{
  CHECK_FATAL (next_status != NULL);
  next_init_dyld (&next_status->dyld_status, symfile_objfile);
}

static
void dyld_cache_purge_command (char *exp, int from_tty)
{
  CHECK_FATAL (next_status != NULL);
  dyld_purge_cached_libraries (&next_status->dyld_status.current_info);
}

static
void dyld_info_process_raw
(struct dyld_objfile_info *info, unsigned char *buf)
{
  CORE_ADDR name, header, slide;

  struct mach_header headerbuf;
  char *namebuf = NULL;

  struct dyld_objfile_entry *entry;
  int errno;

  name = extract_unsigned_integer (buf, 4);
  slide = extract_unsigned_integer (buf + 4, 4);
  header = extract_unsigned_integer (buf + 8, 4);

  target_read_memory (header, (char *) &headerbuf, sizeof (struct mach_header));

  switch (headerbuf.filetype) {
  case 0:
    return;
  case MH_EXECUTE:
    target_read_string (name, &namebuf, 1024, &errno);
    break;
  case MH_DYLIB:
  case MH_DYLINKER:
  case MH_BUNDLE:
    target_read_string (name, &namebuf, 1024, &errno);
    break;
  case MH_FVMLIB:
  case MH_PRELOAD:
    target_read_string (name, &namebuf, 1024, &errno);
    return;
  default:
    warning ("Ignored unknown object module at 0x%lx (offset 0x%lx) with type 0x%lx\n",
             (unsigned long) header, (unsigned long) slide, (unsigned long) headerbuf.filetype);
    return;
  }

  entry = dyld_objfile_entry_alloc (info);

  if (namebuf != NULL) {

    char *s = strchr (namebuf, ':');
    if (s != NULL) {
      *s = '\0';
    }

    entry->dyld_name = xstrdup (namebuf);
    entry->dyld_name_valid = 1;
  }

  entry->dyld_addr = header;
  entry->dyld_slide = slide;
  entry->dyld_index = header;
  entry->dyld_valid = 1;

  switch (headerbuf.filetype) {
  case MH_EXECUTE: {
    entry->reason = dyld_reason_executable;
    if (symfile_objfile != NULL) {
      entry->objfile = symfile_objfile;
      entry->abfd = symfile_objfile->obfd;
      entry->loaded_from_memory = 0;
      entry->loaded_name = entry->dyld_name;
      entry->loaded_addr = 0;
      entry->loaded_addrisoffset = 1;
    }
    break;
  }
  case MH_DYLIB:
    entry->reason = dyld_reason_dyld;
    break;
  case MH_DYLINKER:
  case MH_BUNDLE:
    entry->reason = dyld_reason_dyld;
    break;
  default:
    internal_error (__FILE__, __LINE__, "Unknown object module at 0x%lx (offset 0x%lx) with type 0x%lx\n",
                    (unsigned long) header, (unsigned long) slide, (unsigned long) headerbuf.filetype);
  }
}

static
void dyld_info_read_raw
(struct next_dyld_thread_status *status, struct dyld_objfile_info *info, int dyldonly)
{
  CORE_ADDR library_images_addr;
  CORE_ADDR object_images_addr;
  unsigned int i, nread;

  {
    struct dyld_objfile_entry *entry;

    entry = dyld_objfile_entry_alloc (info);

    entry->dyld_name = xstrdup ("/usr/lib/dyld");
    entry->dyld_name_valid = 1;
    entry->prefix = "__dyld_";

    entry->dyld_addr = dyld_addr;
    entry->dyld_slide = dyld_slide;
    entry->dyld_index = 0;
    entry->dyld_valid = 1;

    entry->reason = dyld_reason_dyld;
  }

  if (dyldonly) {
    return;
  }

  next_init_addresses ();

  library_images_addr = status->library_images;

  while (library_images_addr != NULL) {

    size_t size = status->nlibrary_images * status->library_image_size;
    unsigned char *buf = NULL;
    size_t nimages = 0;

    buf = xmalloc (size + 8);
    target_read_memory (library_images_addr, buf, size + 8);

    nimages = extract_unsigned_integer (buf + size, 4);
    library_images_addr = extract_unsigned_integer (buf + size + 4, 4);
   
    if (nimages > status->nlibrary_images) {
      error ("image specifies an invalid number of libraries (%d)", nimages);
    }

    for (i = 0, nread = 0; i < nimages; i++, nread++) {
      dyld_info_process_raw (info, (buf + (i * status->library_image_size)));
    }

    xfree (buf);
  }

  object_images_addr = status->object_images;

  while (object_images_addr != NULL) {

    size_t size = status->nobject_images * status->object_image_size;
    unsigned char *buf = NULL;
    size_t nimages = 0;

    buf = xmalloc (size + 8);
    target_read_memory (object_images_addr, buf, size + 8);

    nimages = extract_unsigned_integer (buf + size, 4);
    object_images_addr = extract_unsigned_integer (buf + size + 4, 4);
   
    if (nimages > status->nobject_images) {
      error ("image specifies an invalid number of objects (%d)", nimages);
    }

    for (i = 0, nread = 0; i < nimages; i++, nread++) {
      dyld_info_process_raw (info, (buf + (i * status->object_image_size)));
    }

    xfree (buf);
  }
}

int
next_dyld_update (int dyldonly)
{
  int ret;
  int libraries_changed;

  struct dyld_objfile_info previous_info, new_info, saved_info;

  CHECK_FATAL (next_status != NULL);

  dyld_objfile_info_init (&previous_info);
  dyld_objfile_info_init (&new_info);

  dyld_objfile_info_copy (&previous_info, &next_status->dyld_status.current_info);
  dyld_objfile_info_copy (&saved_info, &previous_info);

  dyld_objfile_info_free (&next_status->dyld_status.current_info);
  dyld_objfile_info_init (&next_status->dyld_status.current_info);

  dyld_info_read_raw (&next_status->dyld_status, &next_status->dyld_status.current_info, dyldonly);
  if (inferior_auto_start_cfm_flag)
    ret = cfm_update (next_status->task, &next_status->dyld_status.current_info);
  dyld_update_shlibs (&next_status->dyld_status, &next_status->dyld_status.path_info,
                      &previous_info, &next_status->dyld_status.current_info, &new_info);

  if (dyld_filter_events_flag) {
    libraries_changed = dyld_objfile_info_compare (&saved_info, &new_info);
  } else {
    libraries_changed = 1;
  }

  dyld_objfile_info_free (&saved_info);
  dyld_objfile_info_free (&previous_info);
  dyld_objfile_info_copy (&next_status->dyld_status.current_info, &new_info);
  dyld_objfile_info_free (&new_info);

  return libraries_changed;
}

static
void next_dyld_update_command (char *args, int from_tty)
{
  next_dyld_update (0);
}

extern int dyld_resolve_shlib_num
(struct dyld_objfile_info *s, unsigned int num, struct dyld_objfile_entry **eptr, struct objfile **optr);

static void
map_shlib_numbers
(char *args, void (*function) (struct dyld_path_info *, struct dyld_objfile_entry *, struct objfile *, const char *param), 
 struct dyld_path_info *d, struct dyld_objfile_info *info)
{
  char *p, *p1, *val;
  int num, match;

  if (args == 0)
    error_no_arg ("one or more shlib numbers");

  p = args;
  for (;;) {
    while (isspace (*p) && (*p != '\0'))
      p++;
    if (! isdigit (*p))
      break;
    while ((!isspace (*p)) && (*p != '\0'))
      p++;
  }
  val = p;
  if ((*p != '\0') && (p > args)) {
    p[-1] = '\0';
  }

  p = args;
  while (*p)
    {
      struct dyld_objfile_entry *e;
      struct objfile *o;
      int ret;

      match = 0;
      p1 = p;

      num = get_number_or_range (&p1);
      if (num == 0)
	warning ("bad shlib number at or near '%s'", p);

      ret = dyld_resolve_shlib_num (info, num, &e, &o);

      if (ret < 0)
	warning ("no shlib %d", num);

      (* function) (d, e, o, val);
      
      p = p1;
    }
}

static void
add_helper (struct dyld_path_info *d, struct dyld_objfile_entry *e, struct objfile *o, const char *arg)
{
  if (e != NULL)
    e->load_flag = OBJF_SYM_ALL;
}

static
void dyld_add_symbol_file_command (char *args, int from_tty)
{
  struct dyld_objfile_info original_info, modified_info, new_info;

  dyld_objfile_info_init (&original_info);
  dyld_objfile_info_init (&modified_info);
  dyld_objfile_info_init (&new_info);

  dyld_objfile_info_copy (&original_info, &next_status->dyld_status.current_info);
  dyld_objfile_info_copy (&modified_info, &next_status->dyld_status.current_info);

  map_shlib_numbers (args, add_helper, &next_status->dyld_status.path_info, &modified_info);

  dyld_update_shlibs (&next_status->dyld_status, &next_status->dyld_status.path_info,
                      &original_info, &modified_info, &new_info);
  
  dyld_objfile_info_copy (&next_status->dyld_status.current_info, &new_info);

  dyld_objfile_info_free (&original_info);
  dyld_objfile_info_free (&modified_info);
  dyld_objfile_info_free (&new_info);
}

static
void remove_helper (struct dyld_path_info *d, struct dyld_objfile_entry *e, struct objfile *o, const char *arg)
{
  if (e != NULL)
    e->load_flag = OBJF_SYM_NONE | dyld_minimal_load_flag (d, e);
}

static
void dyld_remove_symbol_file_command (char *args, int from_tty)
{
  struct dyld_objfile_info original_info, modified_info, new_info;

  dyld_objfile_info_init (&original_info);
  dyld_objfile_info_init (&modified_info);
  dyld_objfile_info_init (&new_info);

  dyld_objfile_info_copy (&original_info, &next_status->dyld_status.current_info);
  dyld_objfile_info_copy (&modified_info, &next_status->dyld_status.current_info);

  map_shlib_numbers (args, remove_helper, &next_status->dyld_status.path_info, &modified_info);

  dyld_update_shlibs (&next_status->dyld_status, &next_status->dyld_status.path_info,
                      &original_info, &modified_info, &new_info);
  
  dyld_objfile_info_copy (&next_status->dyld_status.current_info, &new_info);

  dyld_objfile_info_free (&original_info);
  dyld_objfile_info_free (&modified_info);
  dyld_objfile_info_free (&new_info);
}
        
static void
set_load_state_helper (struct dyld_path_info *d, struct dyld_objfile_entry *e, struct objfile *o, const char *arg)
{
  if (e == NULL)
    return;

  e->load_flag = dyld_parse_load_level (arg);
  e->load_flag |= dyld_minimal_load_flag (d, e);
}

static void
dyld_set_load_state_command (char *args, int from_tty)
{
  struct dyld_objfile_info original_info, modified_info, new_info;

  dyld_objfile_info_init (&original_info);
  dyld_objfile_info_init (&modified_info);
  dyld_objfile_info_init (&new_info);

  dyld_objfile_info_copy (&original_info, &next_status->dyld_status.current_info);
  dyld_objfile_info_copy (&modified_info, &next_status->dyld_status.current_info);

  map_shlib_numbers (args, set_load_state_helper, &next_status->dyld_status.path_info, &modified_info);

  dyld_update_shlibs (&next_status->dyld_status, &next_status->dyld_status.path_info,
                      &original_info, &modified_info, &new_info);
  
  dyld_objfile_info_copy (&next_status->dyld_status.current_info, &new_info);

  dyld_objfile_info_free (&original_info);
  dyld_objfile_info_free (&modified_info);
  dyld_objfile_info_free (&new_info);
}
        
static void
section_info_helper (struct dyld_path_info *d, struct dyld_objfile_entry *e, struct objfile *o, const char *arg)
{
  int ret;

  if (o != NULL) {
    print_section_info_objfile (o);
  } else {
    ui_out_list_begin (uiout, "section-info");
    ui_out_list_end (uiout);
  }

  if (e != NULL) {
#if WITH_CFM
    if (e->cfm_connection != 0) {

      NCFragConnectionInfo connection;
      NCFragContainerInfo container;
      struct cfm_parser *parser;
      unsigned long section_index;
      
      parser = &next_status->cfm_status.parser;

      ret = cfm_fetch_connection_info (parser, e->cfm_connection, &connection);
      if (ret != 0)
        return;

      ret = cfm_fetch_container_info (parser, connection.container, &container);
      if (ret != 0)
        return;

      ui_out_list_begin (uiout, "cfm-section-info");

      for (section_index = 0; section_index < container.sectionCount; section_index++)
        {
          NCFragSectionInfo section;
          NCFragInstanceInfo instance;

          ret = cfm_fetch_connection_section_info (parser, e->cfm_connection, section_index, &section, &instance);
          if (ret != 0)
            break;

          ui_out_list_begin (uiout, "section");

          ui_out_text (uiout, "\t");
          ui_out_field_core_addr (uiout, "addr", instance.address);
          ui_out_text (uiout, " - ");
          ui_out_field_core_addr (uiout, "endaddr", instance.address + section.length);
          if (info_verbose)
            {
              ui_out_text (uiout, " @ ");
              ui_out_field_core_addr (uiout, "filepos", 0);
            }
          ui_out_text (uiout, " is ");
          ui_out_field_string (uiout, "name", "unknown");
#if 0
          if (p->objfile->obfd != abfd)
            {
              ui_out_text (uiout, " in ");
              ui_out_field_string (uiout, "filename", bfd_get_filename (p->bfd));
            }
#endif
          ui_out_text (uiout, "\n");

          ui_out_list_end (uiout); /* "section" */
        }

      ui_out_list_end (uiout); /* "cfm-section-info" */
    }
#endif /* WITH_CFM */
  }
}

static void
dyld_section_info_command (char *args, int from_tty)
{
  map_shlib_numbers (args, section_info_helper, &next_status->dyld_status.path_info, &next_status->dyld_status.current_info);
}
        

static void
info_cfm_command (char *args, int from_tty)
{
  CHECK_FATAL (next_status != NULL);
  dyld_print_status_info (&next_status->dyld_status, dyld_reason_cfm);
}

static void
info_raw_cfm_command (char *args, int from_tty)
{
  task_t task = next_status->task;
  struct dyld_objfile_info info;

  dyld_objfile_info_init (&info);
  cfm_update (task, &info);

  dyld_print_shlib_info (&info, dyld_reason_cfm);
}

#if 0
static void
set_shlib (char *arg, int from_tty)
{
  printf_unfiltered (
     "\"set shlib\" must be followed by the name of a shlib subcommand.\n");
  help_list (setshliblist, "set shlib ", -1, gdb_stdout);
}

static void
show_shlib (char *args, int from_tty)
{
  cmd_show_list (showshliblist, from_tty, "");
}
#endif

struct cmd_list_element *dyldlist = NULL;
struct cmd_list_element *setshliblist = NULL;
struct cmd_list_element *showshliblist = NULL;
struct cmd_list_element *infoshliblist = NULL;
struct cmd_list_element *shliblist = NULL;

void
_initialize_nextstep_nat_dyld ()
{
  struct cmd_list_element *cmd = NULL;

  dyld_stderr = fdopen (fileno (stderr), "w+");

  add_prefix_cmd ("sharedlibrary", class_run, not_just_help_class_command,
                  "Command prefix for shared library manipulation",
                  &shliblist, "sharedlibrary ", 0, &cmdlist);

  add_cmd ("init", class_run, next_dyld_init_command,
           "Init DYLD libraries to initial guesses.", &shliblist);

  add_cmd ("add-symbol-file", class_run, dyld_add_symbol_file_command,
           "Add a symbol file.", &shliblist);

  add_cmd ("remove-symbol-file", class_run, dyld_remove_symbol_file_command,
           "Remove a symbol file.", &shliblist);

  add_cmd ("set-load-state", class_run, dyld_set_load_state_command,
           "Set the load level of a library (given by the index from \"info sharedlibrary\").", &shliblist);

  add_cmd ("section-info", class_run, dyld_section_info_command,
           "Get the section info for a library (given by index).", &shliblist);

  add_cmd ("cache-purge", class_obscure, dyld_cache_purge_command,
           "Purge all symbols for DYLD images cached by GDB.", &shliblist);

  add_cmd ("update", class_run, next_dyld_update_command,
           "Process all pending DYLD events.", &shliblist);

  add_prefix_cmd ("sharedlibrary", no_class, info_sharedlibrary_command,
                  "Generic command for shlib information.",
                  &infoshliblist, "info sharedlibrary ", 0, &infolist);

  add_cmd ("cfm", no_class, info_cfm_command, "Show current CFM state.", &infoshliblist);
  add_cmd ("raw-cfm", no_class, info_raw_cfm_command, "Show current CFM state.", &infoshliblist);
  add_cmd ("dyld", no_class, info_dyld_command, "Show current DYLD state.", &infoshliblist);  

  add_prefix_cmd ("sharedlibrary", no_class, not_just_help_class_command,
                  "Generic command for setting shlib settings.",
                  &setshliblist, "set sharedlibrary ", 0, &setlist);

  add_prefix_cmd ("sharedlibrary", no_class, not_just_help_class_command,
                  "Generic command for showing shlib settings.",
                  &showshliblist, "show sharedlibrary ", 0, &showlist);

  cmd = add_set_cmd ("filter-events", class_obscure, var_boolean,
                     (char *) &dyld_filter_events_flag,
                     "Set if GDB should filter shared library events to a minimal set.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);                

  cmd = add_set_cmd ("preload-libraries", class_obscure, var_boolean, 
                     (char *) &dyld_preload_libraries_flag,
                     "Set if GDB should pre-load symbols for DYLD libraries.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);                

  cmd = add_set_cmd ("load-dyld-symbols", class_obscure, var_boolean, 
                     (char *) &dyld_load_dyld_symbols_flag,
                     "Set if GDB should load symbol information for the dynamic linker.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("load-dyld-shlib-symbols", class_obscure, var_boolean, 
                     (char *) &dyld_load_dyld_shlib_symbols_flag,
                     "Set if GDB should load symbol information for DYLD-based shared libraries.",
                     &setshliblist);
  deprecate_cmd (cmd, "set sharedlibrary load-rules");
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("load-cfm-shlib-symbols", class_obscure, var_boolean, 
                     (char *) &dyld_load_cfm_shlib_symbols_flag,
                     "Set if GDB should load symbol information for CFM-based shared libraries.",
                     &setshliblist);
  deprecate_cmd (cmd, "set sharedlibrary load-rules");
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("dyld-symbols-prefix", class_obscure, var_string, 
                     (char *) &dyld_symbols_prefix,
                     "Set the prefix that GDB should prepend to all symbols for the dynamic linker.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);
  dyld_symbols_prefix = xstrdup (dyld_symbols_prefix);

  cmd = add_set_cmd ("always-read-from-memory", class_obscure, var_boolean, 
                     (char *) &dyld_always_read_from_memory_flag,
                     "Set if GDB should always read loaded images from the inferior's memory.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("print-basenames", class_obscure, var_boolean,
                     (char *) &dyld_print_basenames_flag,
                     "Set if GDB should print the basenames of loaded files when printing progress messages.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("load-rules", class_support, var_string,
                     (char *) &dyld_load_rules,
                     "Set the rules governing the level of symbol loading for shared libraries.\n\
 * Each load rule is a triple.\n\
 * The command takes a flattened list of triples.\n\
 * The first two elements of the triple specify the library, by giving \n\
      - \"who loaded it\" (i.e. dyld, cfm or all) in the first element, \n\
      - and a regexp to match the library name in the second. \n\
 * The last element specifies the level of loading for that library\n\
      - The options are:  all, extern, container or none.\n\
\n\
Example: To load only external symbols from all dyld-based system libraries, use: \n\
    set sharedlibrary load-rules dyld ^/System/Library.* extern\n",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("minimal-load-rules", class_support, var_string,
                     (char *) &dyld_minimal_load_rules,
                     "Set the minimal DYLD load rules.  These prime the main list.\n\
gdb relies on some of these for proper functioning, so don't remove elements from it\n\
unless you know what you are doing.",
                     &setshliblist);
  add_show_from_set (cmd, &showshliblist);

  cmd = add_set_cmd ("debug-dyld", class_obscure, var_zinteger, 
                     (char *) &dyld_debug_flag,
                     "Set if printing dyld communication debugging statements.",
                     &setlist);
  add_show_from_set (cmd, &showlist);

  dyld_minimal_load_rules = xstrdup ("\"dyld\" \"CarbonCore$\\\\|CarbonCore_[^/]*$\" all \".*\" \"dyld$\" extern \".*\" \".*\" none");
  dyld_load_rules = xstrdup ("\".*\" \".*\" all");
}