Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 2581 insertions, 0 deletions

diff --git a/gdb/target.c b/gdb/target.c
new file mode 100644
index 0000000..808eb8f
--- /dev/null
+++ b/gdb/target.c
@@ -0,0 +1,2581 @@
+/* Select target systems and architectures at runtime for GDB.
+   Copyright 1990, 1992-1995, 1998, 1999 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+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"
+#include <errno.h>
+#include <ctype.h>
+#include "gdb_string.h"
+#include "target.h"
+#include "gdbcmd.h"
+#include "symtab.h"
+#include "inferior.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "wait.h"
+#include <signal.h>
+
+extern int errno;
+
+static void
+target_info PARAMS ((char *, int));
+
+static void
+cleanup_target PARAMS ((struct target_ops *));
+
+static void
+maybe_kill_then_create_inferior PARAMS ((char *, char *, char **));
+
+static void
+default_clone_and_follow_inferior PARAMS ((int, int *));
+
+static void
+maybe_kill_then_attach PARAMS ((char *, int));
+
+static void
+kill_or_be_killed PARAMS ((int));
+
+static void
+default_terminal_info PARAMS ((char *, int));
+
+static int
+nosymbol PARAMS ((char *, CORE_ADDR *));
+
+static void
+tcomplain PARAMS ((void));
+
+static int
+nomemory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
+
+static int
+return_zero PARAMS ((void));
+
+static int
+return_one PARAMS ((void));
+
+void
+target_ignore PARAMS ((void));
+
+static void
+target_command PARAMS ((char *, int));
+
+static struct target_ops *
+find_default_run_target PARAMS ((char *));
+
+static void
+update_current_target PARAMS ((void));
+
+/* Transfer LEN bytes between target address MEMADDR and GDB address MYADDR.
+   Returns 0 for success, errno code for failure (which includes partial
+   transfers--if you want a more useful response to partial transfers, try
+   target_read_memory_partial).  */
+
+static int
+target_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
+			    int write, asection *bfd_section));
+
+static void init_dummy_target PARAMS ((void));
+
+static void
+debug_to_open PARAMS ((char *, int));
+
+static void
+debug_to_close PARAMS ((int));
+
+static void
+debug_to_attach PARAMS ((char *, int));
+
+static void
+debug_to_detach PARAMS ((char *, int));
+
+static void
+debug_to_resume PARAMS ((int, int, enum target_signal));
+
+static int
+debug_to_wait PARAMS ((int, struct target_waitstatus *));
+
+static void
+debug_to_fetch_registers PARAMS ((int));
+
+static void
+debug_to_store_registers PARAMS ((int));
+
+static void
+debug_to_prepare_to_store PARAMS ((void));
+
+static int
+debug_to_xfer_memory PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
+
+static void
+debug_to_files_info PARAMS ((struct target_ops *));
+
+static int
+debug_to_insert_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int
+debug_to_remove_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static void
+debug_to_terminal_init PARAMS ((void));
+
+static void
+debug_to_terminal_inferior PARAMS ((void));
+
+static void
+debug_to_terminal_ours_for_output PARAMS ((void));
+
+static void
+debug_to_terminal_ours PARAMS ((void));
+
+static void
+debug_to_terminal_info PARAMS ((char *, int));
+
+static void
+debug_to_kill PARAMS ((void));
+
+static void
+debug_to_load PARAMS ((char *, int));
+
+static int
+debug_to_lookup_symbol PARAMS ((char *, CORE_ADDR *));
+
+static void
+debug_to_create_inferior PARAMS ((char *, char *, char **));
+
+static void
+debug_to_mourn_inferior PARAMS ((void));
+
+static int
+debug_to_can_run PARAMS ((void));
+
+static void
+debug_to_notice_signals PARAMS ((int));
+
+static int
+debug_to_thread_alive PARAMS ((int));
+
+static void
+debug_to_stop PARAMS ((void));
+
+static int debug_to_query PARAMS ((int/*char*/, char *, char *, int *));
+
+/* Pointer to array of target architecture structures; the size of the
+   array; the current index into the array; the allocated size of the 
+   array.  */
+struct target_ops **target_structs;
+unsigned target_struct_size;
+unsigned target_struct_index;
+unsigned target_struct_allocsize;
+#define	DEFAULT_ALLOCSIZE	10
+
+/* The initial current target, so that there is always a semi-valid
+   current target.  */
+
+static struct target_ops dummy_target;
+
+/* Top of target stack.  */
+
+struct target_stack_item *target_stack;
+
+/* The target structure we are currently using to talk to a process
+   or file or whatever "inferior" we have.  */
+
+struct target_ops current_target;
+
+/* Command list for target.  */
+
+static struct cmd_list_element *targetlist = NULL;
+
+/* Nonzero if we are debugging an attached outside process
+   rather than an inferior.  */
+
+int attach_flag;
+
+#ifdef MAINTENANCE_CMDS
+/* Non-zero if we want to see trace of target level stuff.  */
+
+static int targetdebug = 0;
+
+static void setup_target_debug PARAMS ((void));
+
+#endif
+
+/* The user just typed 'target' without the name of a target.  */
+
+/* ARGSUSED */
+static void
+target_command (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  fputs_filtered ("Argument required (target name).  Try `help target'\n",
+		  gdb_stdout);
+}
+
+/* Add a possible target architecture to the list.  */
+
+void
+add_target (t)
+     struct target_ops *t;
+{
+  if (!target_structs)
+    {
+      target_struct_allocsize = DEFAULT_ALLOCSIZE;
+      target_structs = (struct target_ops **) xmalloc
+	(target_struct_allocsize * sizeof (*target_structs));
+    }
+  if (target_struct_size >= target_struct_allocsize)
+    {
+      target_struct_allocsize *= 2;
+      target_structs = (struct target_ops **)
+	  xrealloc ((char *) target_structs, 
+		    target_struct_allocsize * sizeof (*target_structs));
+    }
+  target_structs[target_struct_size++] = t;
+/*  cleanup_target (t);*/
+
+  if (targetlist == NULL)
+    add_prefix_cmd ("target", class_run, target_command,
+		    "Connect to a target machine or process.\n\
+The first argument is the type or protocol of the target machine.\n\
+Remaining arguments are interpreted by the target protocol.  For more\n\
+information on the arguments for a particular protocol, type\n\
+`help target ' followed by the protocol name.",
+		    &targetlist, "target ", 0, &cmdlist);
+  add_cmd (t->to_shortname, no_class, t->to_open, t->to_doc, &targetlist);
+}
+
+/* Stub functions */
+
+void
+target_ignore ()
+{
+}
+
+/* ARGSUSED */
+static int
+nomemory (memaddr, myaddr, len, write, t)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     struct target_ops *t;
+{
+  errno = EIO;		/* Can't read/write this location */
+  return 0;		/* No bytes handled */
+}
+
+static void
+tcomplain ()
+{
+  error ("You can't do that when your target is `%s'",
+	 current_target.to_shortname);
+}
+
+void
+noprocess ()
+{
+  error ("You can't do that without a process to debug.");
+}
+
+/* ARGSUSED */
+static int
+nosymbol (name, addrp)
+     char *name;
+     CORE_ADDR *addrp;
+{
+  return 1;		/* Symbol does not exist in target env */
+}
+
+/* ARGSUSED */
+void
+nosupport_runtime ()
+{
+  if (!inferior_pid)
+    noprocess ();
+  else
+    error ("No run-time support for this");
+}
+
+
+/* ARGSUSED */
+static void
+default_terminal_info (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  printf_unfiltered("No saved terminal information.\n");
+}
+
+/* This is the default target_create_inferior and target_attach function.
+   If the current target is executing, it asks whether to kill it off.
+   If this function returns without calling error(), it has killed off
+   the target, and the operation should be attempted.  */
+
+static void
+kill_or_be_killed (from_tty)
+     int from_tty;
+{
+  if (target_has_execution)
+    {
+      printf_unfiltered ("You are already running a program:\n");
+      target_files_info ();
+      if (query ("Kill it? ")) {
+	target_kill ();
+	if (target_has_execution)
+	  error ("Killing the program did not help.");
+	return;
+      } else {
+	error ("Program not killed.");
+      }
+    }
+  tcomplain();
+}
+
+static void
+maybe_kill_then_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  kill_or_be_killed (from_tty);
+  target_attach (args, from_tty);
+}
+
+static void
+maybe_kill_then_create_inferior (exec, args, env)
+     char *exec;
+     char *args;
+     char **env;
+{
+  kill_or_be_killed (0);
+  target_create_inferior (exec, args, env);
+}
+
+static void
+default_clone_and_follow_inferior (child_pid, followed_child)
+  int  child_pid;
+  int  *followed_child;
+{
+  target_clone_and_follow_inferior (child_pid, followed_child);
+}
+
+/* Clean up a target struct so it no longer has any zero pointers in it.
+   We default entries, at least to stubs that print error messages.  */
+
+static void
+cleanup_target (t)
+     struct target_ops *t;
+{
+
+#define de_fault(field, value) \
+  if (!t->field)	t->field = value
+
+  /*        FIELD			DEFAULT VALUE        */
+
+  de_fault (to_open, 			(void (*) PARAMS((char *, int))) tcomplain);
+  de_fault (to_close, 			(void (*) PARAMS((int))) target_ignore);
+  de_fault (to_attach, 			maybe_kill_then_attach);
+  de_fault (to_post_attach,             (void (*) PARAMS ((int))) target_ignore);
+  de_fault (to_require_attach,          maybe_kill_then_attach);
+  de_fault (to_detach, 			(void (*) PARAMS((char *, int))) target_ignore);
+  de_fault (to_require_detach,          (void (*) PARAMS((int, char *, int))) target_ignore);
+  de_fault (to_resume, 			(void (*) PARAMS((int, int, enum target_signal))) noprocess);
+  de_fault (to_wait, 			(int (*) PARAMS((int, struct target_waitstatus *))) noprocess);
+  de_fault (to_post_wait,               (void (*) PARAMS ((int, int))) target_ignore);
+  de_fault (to_fetch_registers, 	(void (*) PARAMS((int))) target_ignore);
+  de_fault (to_store_registers,		(void (*) PARAMS((int))) noprocess);
+  de_fault (to_prepare_to_store,	(void (*) PARAMS((void))) noprocess);
+  de_fault (to_xfer_memory,		(int (*) PARAMS((CORE_ADDR, char *, int, int, struct target_ops *))) nomemory);
+  de_fault (to_files_info,		(void (*) PARAMS((struct target_ops *))) target_ignore);
+  de_fault (to_insert_breakpoint,	memory_insert_breakpoint);
+  de_fault (to_remove_breakpoint,	memory_remove_breakpoint);
+  de_fault (to_terminal_init,		(void (*) PARAMS((void))) target_ignore);
+  de_fault (to_terminal_inferior,	(void (*) PARAMS ((void))) target_ignore);
+  de_fault (to_terminal_ours_for_output,(void (*) PARAMS ((void))) target_ignore);
+  de_fault (to_terminal_ours,		(void (*) PARAMS ((void))) target_ignore);
+  de_fault (to_terminal_info,		default_terminal_info);
+  de_fault (to_kill,			(void (*) PARAMS((void))) noprocess);
+  de_fault (to_load,			(void (*) PARAMS((char *, int))) tcomplain);
+  de_fault (to_lookup_symbol,		(int (*) PARAMS ((char *, CORE_ADDR *))) nosymbol);
+  de_fault (to_create_inferior,		maybe_kill_then_create_inferior);
+  de_fault (to_post_startup_inferior,   (void (*) PARAMS ((int))) target_ignore);
+  de_fault (to_acknowledge_created_inferior,            (void (*) PARAMS((int))) target_ignore);
+  de_fault (to_clone_and_follow_inferior,               default_clone_and_follow_inferior);
+  de_fault (to_post_follow_inferior_by_clone,           (void (*) PARAMS ((void))) target_ignore);
+  de_fault (to_insert_fork_catchpoint,  (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_remove_fork_catchpoint,  (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_insert_vfork_catchpoint, (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_remove_vfork_catchpoint, (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_has_forked,              (int (*) PARAMS ((int, int *))) return_zero);
+  de_fault (to_has_vforked,             (int (*) PARAMS ((int, int *))) return_zero);
+  de_fault (to_can_follow_vfork_prior_to_exec, (int (*) PARAMS ((void ))) return_zero);
+  de_fault (to_post_follow_vfork,       (void (*) PARAMS ((int, int, int, int))) target_ignore);
+  de_fault (to_insert_exec_catchpoint,  (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_remove_exec_catchpoint,  (int (*) PARAMS ((int))) tcomplain);
+  de_fault (to_has_execd,               (int (*) PARAMS ((int, char **))) return_zero);
+  de_fault (to_reported_exec_events_per_exec_call, (int (*) PARAMS ((void))) return_one);
+  de_fault (to_has_syscall_event,       (int (*) PARAMS ((int, enum target_waitkind *, int *))) return_zero);
+  de_fault (to_has_exited,              (int (*) PARAMS ((int, int, int *))) return_zero);
+  de_fault (to_mourn_inferior,		(void (*) PARAMS ((void))) noprocess);
+  de_fault (to_can_run,			return_zero);
+  de_fault (to_notice_signals,		(void (*) PARAMS((int))) target_ignore);
+  de_fault (to_thread_alive,		(int (*) PARAMS((int))) target_ignore);
+  de_fault (to_stop,			(void (*) PARAMS((void))) target_ignore);
+  de_fault (to_query,			(int (*) PARAMS((int/*char*/, char*, char *, int *))) target_ignore);
+  de_fault (to_enable_exception_callback,	(struct symtab_and_line * (*) PARAMS((enum exception_event_kind, int))) nosupport_runtime);
+  de_fault (to_get_current_exception_event,	(struct exception_event_record * (*) PARAMS((void))) nosupport_runtime);
+
+  de_fault (to_pid_to_exec_file,        (char* (*) PARAMS((int))) return_zero);
+  de_fault (to_core_file_to_sym_file,   (char* (*) PARAMS ((char *))) return_zero);
+#undef de_fault
+}
+
+/* Go through the target stack from top to bottom, copying over zero entries in
+   current_target.  In effect, we are doing class inheritance through the
+   pushed target vectors.  */
+
+static void
+update_current_target ()
+{
+  struct target_stack_item *item;
+  struct target_ops *t;
+
+  /* First, reset current_target */
+  memset (&current_target, 0, sizeof current_target);
+
+  for (item = target_stack; item; item = item->next)
+    {
+      t = item->target_ops;
+
+#define INHERIT(FIELD, TARGET) \
+      if (!current_target.FIELD) \
+	current_target.FIELD = TARGET->FIELD
+
+      INHERIT (to_shortname, t);
+      INHERIT (to_longname, t);
+      INHERIT (to_doc, t);
+      INHERIT (to_open, t);
+      INHERIT (to_close, t);
+      INHERIT (to_attach, t);
+      INHERIT (to_post_attach, t);
+      INHERIT (to_require_attach, t);
+      INHERIT (to_detach, t);
+      INHERIT (to_require_detach, t);
+      INHERIT (to_resume, t);
+      INHERIT (to_wait, t);
+      INHERIT (to_post_wait, t);
+      INHERIT (to_fetch_registers, t);
+      INHERIT (to_store_registers, t);
+      INHERIT (to_prepare_to_store, t);
+      INHERIT (to_xfer_memory, t);
+      INHERIT (to_files_info, t);
+      INHERIT (to_insert_breakpoint, t);
+      INHERIT (to_remove_breakpoint, t);
+      INHERIT (to_terminal_init, t);
+      INHERIT (to_terminal_inferior, t);
+      INHERIT (to_terminal_ours_for_output, t);
+      INHERIT (to_terminal_ours, t);
+      INHERIT (to_terminal_info, t);
+      INHERIT (to_kill, t);
+      INHERIT (to_load, t);
+      INHERIT (to_lookup_symbol, t);
+      INHERIT (to_create_inferior, t);
+      INHERIT (to_post_startup_inferior, t);
+      INHERIT (to_acknowledge_created_inferior, t);
+      INHERIT (to_clone_and_follow_inferior, t);
+      INHERIT (to_post_follow_inferior_by_clone, t);
+      INHERIT (to_insert_fork_catchpoint, t);
+      INHERIT (to_remove_fork_catchpoint, t);
+      INHERIT (to_insert_vfork_catchpoint, t);
+      INHERIT (to_remove_vfork_catchpoint, t);
+      INHERIT (to_has_forked, t);
+      INHERIT (to_has_vforked, t);
+      INHERIT (to_can_follow_vfork_prior_to_exec, t);
+      INHERIT (to_post_follow_vfork, t);
+      INHERIT (to_insert_exec_catchpoint, t);
+      INHERIT (to_remove_exec_catchpoint, t);
+      INHERIT (to_has_execd, t);
+      INHERIT (to_reported_exec_events_per_exec_call, t);
+      INHERIT (to_has_syscall_event, t);
+      INHERIT (to_has_exited, t);
+      INHERIT (to_mourn_inferior, t);
+      INHERIT (to_can_run, t);
+      INHERIT (to_notice_signals, t);
+      INHERIT (to_thread_alive, t);
+      INHERIT (to_stop, t);
+      INHERIT (to_query, t);
+      INHERIT (to_enable_exception_callback, t);
+      INHERIT (to_get_current_exception_event, t);
+      INHERIT (to_pid_to_exec_file, t);
+      INHERIT (to_core_file_to_sym_file, t);
+      INHERIT (to_stratum, t);
+      INHERIT (DONT_USE, t);
+      INHERIT (to_has_all_memory, t);
+      INHERIT (to_has_memory, t);
+      INHERIT (to_has_stack, t);
+      INHERIT (to_has_registers, t);
+      INHERIT (to_has_execution, t);
+      INHERIT (to_has_thread_control, t);
+      INHERIT (to_sections, t);
+      INHERIT (to_sections_end, t);
+      INHERIT (to_magic, t);
+
+#undef INHERIT
+    }
+}
+
+/* Push a new target type into the stack of the existing target accessors,
+   possibly superseding some of the existing accessors.
+
+   Result is zero if the pushed target ended up on top of the stack,
+   nonzero if at least one target is on top of it.
+
+   Rather than allow an empty stack, we always have the dummy target at
+   the bottom stratum, so we can call the function vectors without
+   checking them.  */
+
+int
+push_target (t)
+     struct target_ops *t;
+{
+  struct target_stack_item *cur, *prev, *tmp;
+
+  /* Check magic number.  If wrong, it probably means someone changed
+     the struct definition, but not all the places that initialize one.  */
+  if (t->to_magic != OPS_MAGIC)
+    {
+      fprintf_unfiltered(gdb_stderr,
+			 "Magic number of %s target struct wrong\n", 
+			 t->to_shortname);
+      abort();
+    }
+
+  /* Find the proper stratum to install this target in. */
+
+  for (prev = NULL, cur = target_stack; cur; prev = cur, cur = cur->next)
+    {
+      if ((int)(t->to_stratum) >= (int)(cur->target_ops->to_stratum))
+	break;
+    }
+
+  /* If there's already targets at this stratum, remove them. */
+
+  if (cur)
+    while (t->to_stratum == cur->target_ops->to_stratum)
+      {
+	/* There's already something on this stratum.  Close it off.  */
+	if (cur->target_ops->to_close)
+	  (cur->target_ops->to_close) (0);
+	if (prev)
+	  prev->next = cur->next; /* Unchain old target_ops */
+	else
+	  target_stack = cur->next; /* Unchain first on list */
+	tmp = cur->next;
+	free (cur);
+	cur = tmp;
+      }
+
+  /* We have removed all targets in our stratum, now add the new one.  */
+
+  tmp = (struct target_stack_item *)
+    xmalloc (sizeof (struct target_stack_item));
+  tmp->next = cur;
+  tmp->target_ops = t;
+
+  if (prev)
+    prev->next = tmp;
+  else
+    target_stack = tmp;
+
+  update_current_target ();
+
+  cleanup_target (&current_target); /* Fill in the gaps */
+
+#ifdef MAINTENANCE_CMDS
+  if (targetdebug)
+    setup_target_debug ();
+#endif
+
+  return prev != 0;
+}
+
+/* Remove a target_ops vector from the stack, wherever it may be. 
+   Return how many times it was removed (0 or 1).  */
+
+int
+unpush_target (t)
+     struct target_ops *t;
+{
+  struct target_stack_item *cur, *prev;
+
+  if (t->to_close)
+    t->to_close (0);		/* Let it clean up */
+
+  /* Look for the specified target.  Note that we assume that a target
+     can only occur once in the target stack. */
+
+  for (cur = target_stack, prev = NULL; cur; prev = cur, cur = cur->next)
+    if (cur->target_ops == t)
+      break;
+
+  if (!cur)
+    return 0;			/* Didn't find target_ops, quit now */
+
+  /* Unchain the target */
+
+  if (!prev)
+    target_stack = cur->next;
+  else
+    prev->next = cur->next;
+
+  free (cur);			/* Release the target_stack_item */
+
+  update_current_target ();
+  cleanup_target (&current_target);
+
+  return 1;
+}
+
+void
+pop_target ()
+{
+  (current_target.to_close)(0);	/* Let it clean up */
+  if (unpush_target (target_stack->target_ops) == 1)
+    return;
+
+  fprintf_unfiltered(gdb_stderr,
+		     "pop_target couldn't find target %s\n", 
+		     current_target.to_shortname);
+  abort();
+}
+
+#undef	MIN
+#define MIN(A, B) (((A) <= (B)) ? (A) : (B))
+
+/* target_read_string -- read a null terminated string, up to LEN bytes,
+   from MEMADDR in target.  Set *ERRNOP to the errno code, or 0 if successful.
+   Set *STRING to a pointer to malloc'd memory containing the data; the caller
+   is responsible for freeing it.  Return the number of bytes successfully
+   read.  */
+
+int
+target_read_string (memaddr, string, len, errnop)
+     CORE_ADDR memaddr;
+     char **string;
+     int len;
+     int *errnop;
+{
+  int tlen, origlen, offset, i;
+  char buf[4];
+  int errcode = 0;
+  char *buffer;
+  int buffer_allocated;
+  char *bufptr;
+  unsigned int nbytes_read = 0;
+
+  /* Small for testing.  */
+  buffer_allocated = 4;
+  buffer = xmalloc (buffer_allocated);
+  bufptr = buffer;
+
+  origlen = len;
+
+  while (len > 0)
+    {
+      tlen = MIN (len, 4 - (memaddr & 3));
+      offset = memaddr & 3;
+
+      errcode = target_xfer_memory (memaddr & ~3, buf, 4, 0, NULL);
+      if (errcode != 0)
+	{
+	  /* The transfer request might have crossed the boundary to an
+	     unallocated region of memory. Retry the transfer, requesting
+	     a single byte.  */
+	  tlen = 1;
+	  offset = 0;
+	  errcode = target_xfer_memory (memaddr, buf, 1, 0, NULL);
+	  if (errcode != 0)
+	    goto done;
+	}
+
+      if (bufptr - buffer + tlen > buffer_allocated)
+	{
+	  unsigned int bytes;
+	  bytes = bufptr - buffer;
+	  buffer_allocated *= 2;
+	  buffer = xrealloc (buffer, buffer_allocated);
+	  bufptr = buffer + bytes;
+	}
+
+      for (i = 0; i < tlen; i++)
+	{
+	  *bufptr++ = buf[i + offset];
+	  if (buf[i + offset] == '\000')
+	    {
+	      nbytes_read += i + 1;
+	      goto done;
+	    }
+	}
+
+      memaddr += tlen;
+      len -= tlen;
+      nbytes_read += tlen;
+    }
+ done:
+  if (errnop != NULL)
+    *errnop = errcode;
+  if (string != NULL)
+    *string = buffer;
+  return nbytes_read;
+}
+
+/* Read LEN bytes of target memory at address MEMADDR, placing the results in
+   GDB's memory at MYADDR.  Returns either 0 for success or an errno value
+   if any error occurs.
+
+   If an error occurs, no guarantee is made about the contents of the data at
+   MYADDR.  In particular, the caller should not depend upon partial reads
+   filling the buffer with good data.  There is no way for the caller to know
+   how much good data might have been transfered anyway.  Callers that can
+   deal with partial reads should call target_read_memory_partial. */
+
+int
+target_read_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  return target_xfer_memory (memaddr, myaddr, len, 0, NULL);
+}
+
+int
+target_read_memory_section (memaddr, myaddr, len, bfd_section)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     asection *bfd_section;
+{
+  return target_xfer_memory (memaddr, myaddr, len, 0, bfd_section);
+}
+
+/* Read LEN bytes of target memory at address MEMADDR, placing the results
+   in GDB's memory at MYADDR.  Returns a count of the bytes actually read,
+   and optionally an errno value in the location pointed to by ERRNOPTR
+   if ERRNOPTR is non-null. */
+
+int
+target_read_memory_partial (memaddr, myaddr, len, errnoptr)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int *errnoptr;
+{
+  int nread;	/* Number of bytes actually read. */
+  int errcode;	/* Error from last read. */
+
+  /* First try a complete read. */
+  errcode = target_xfer_memory (memaddr, myaddr, len, 0, NULL);
+  if (errcode == 0)
+    {
+      /* Got it all. */
+      nread = len;
+    }
+  else
+    {
+      /* Loop, reading one byte at a time until we get as much as we can. */
+      for (errcode = 0, nread = 0; len > 0 && errcode == 0; nread++, len--)
+	{
+	  errcode = target_xfer_memory (memaddr++, myaddr++, 1, 0, NULL);
+	}
+      /* If an error, the last read was unsuccessful, so adjust count. */
+      if (errcode != 0)
+	{
+	  nread--;
+	}
+    }
+  if (errnoptr != NULL)
+    {
+      *errnoptr = errcode;
+    }
+  return (nread);
+}
+
+int
+target_write_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  return target_xfer_memory (memaddr, myaddr, len, 1, NULL);
+}
+ 
+/* This variable is used to pass section information down to targets.  This
+   *should* be done by adding an argument to the target_xfer_memory function
+   of all the targets, but I didn't feel like changing 50+ files.  */
+
+asection *target_memory_bfd_section = NULL;
+
+/* Move memory to or from the targets.  Iterate until all of it has
+   been moved, if necessary.  The top target gets priority; anything
+   it doesn't want, is offered to the next one down, etc.  Note the
+   business with curlen:  if an early target says "no, but I have a
+   boundary overlapping this xfer" then we shorten what we offer to
+   the subsequent targets so the early guy will get a chance at the
+   tail before the subsequent ones do. 
+
+   Result is 0 or errno value.  */
+
+static int
+target_xfer_memory (memaddr, myaddr, len, write, bfd_section)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     asection *bfd_section;
+{
+  int curlen;
+  int res;
+  struct target_ops *t;
+  struct target_stack_item *item;
+
+  /* Zero length requests are ok and require no work.  */
+  if (len == 0)
+    return 0;
+
+  target_memory_bfd_section = bfd_section;
+
+  /* to_xfer_memory is not guaranteed to set errno, even when it returns
+     0.  */
+  errno = 0;
+
+  /* The quick case is that the top target does it all.  */
+  res = current_target.to_xfer_memory
+			(memaddr, myaddr, len, write, &current_target);
+  if (res == len)
+    return 0;
+
+  if (res > 0)
+    goto bump;
+  /* If res <= 0 then we call it again in the loop.  Ah well.  */
+
+  for (; len > 0;)
+    {
+      curlen = len;		/* Want to do it all */
+      for (item = target_stack; item; item = item->next)
+	{
+	  t = item->target_ops;
+	  if (!t->to_has_memory)
+	    continue;
+
+	  res = t->to_xfer_memory (memaddr, myaddr, curlen, write, t);
+	  if (res > 0)
+	    break;		/* Handled all or part of xfer */
+	  if (t->to_has_all_memory)
+	    break;
+	}
+
+      if (res <= 0)
+	{
+	  /* If this address is for nonexistent memory,
+	     read zeros if reading, or do nothing if writing.  Return error. */
+	  if (!write)
+	    memset (myaddr, 0, len);
+	  if (errno == 0)
+	    return EIO;
+	  else
+	    return errno;
+	}
+bump:
+      memaddr += res;
+      myaddr  += res;
+      len     -= res;
+    }
+  return 0;			/* We managed to cover it all somehow. */
+}
+
+
+/* ARGSUSED */
+static void
+target_info (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  struct target_ops *t;
+  struct target_stack_item *item;
+  int has_all_mem = 0;
+  
+  if (symfile_objfile != NULL)
+    printf_unfiltered ("Symbols from \"%s\".\n", symfile_objfile->name);
+
+#ifdef FILES_INFO_HOOK
+  if (FILES_INFO_HOOK ())
+    return;
+#endif
+
+  for (item = target_stack; item; item = item->next)
+    {
+      t = item->target_ops;
+
+      if (!t->to_has_memory)
+	continue;
+
+      if ((int)(t->to_stratum) <= (int)dummy_stratum)
+	continue;
+      if (has_all_mem)
+	printf_unfiltered("\tWhile running this, GDB does not access memory from...\n");
+      printf_unfiltered("%s:\n", t->to_longname);
+      (t->to_files_info)(t);
+      has_all_mem = t->to_has_all_memory;
+    }
+}
+
+/* This is to be called by the open routine before it does
+   anything.  */
+
+void
+target_preopen (from_tty)
+     int from_tty;
+{
+  dont_repeat();
+
+  if (target_has_execution)
+    {   
+      if (query ("A program is being debugged already.  Kill it? "))
+        target_kill ();
+      else
+        error ("Program not killed.");
+    }
+
+  /* Calling target_kill may remove the target from the stack.  But if
+     it doesn't (which seems like a win for UDI), remove it now.  */
+
+  if (target_has_execution)
+    pop_target ();
+}
+
+/* Detach a target after doing deferred register stores.  */
+
+void
+target_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  /* Handle any optimized stores to the inferior.  */
+#ifdef DO_DEFERRED_STORES
+  DO_DEFERRED_STORES;
+#endif
+  (current_target.to_detach) (args, from_tty);
+}
+
+void
+target_link (modname, t_reloc)
+     char *modname;
+     CORE_ADDR *t_reloc;
+{
+  if (STREQ(current_target.to_shortname, "rombug"))
+    {
+      (current_target.to_lookup_symbol) (modname, t_reloc);
+      if (*t_reloc == 0)
+      error("Unable to link to %s and get relocation in rombug", modname);
+    }
+  else
+    *t_reloc = (CORE_ADDR)-1;
+}
+
+/* Look through the list of possible targets for a target that can
+   execute a run or attach command without any other data.  This is
+   used to locate the default process stratum.
+
+   Result is always valid (error() is called for errors).  */
+
+static struct target_ops *
+find_default_run_target (do_mesg)
+     char *do_mesg;
+{
+  struct target_ops **t;
+  struct target_ops *runable = NULL;
+  int count;
+
+  count = 0;
+
+  for (t = target_structs; t < target_structs + target_struct_size;
+       ++t)
+    {
+      if ((*t)->to_can_run && target_can_run(*t))
+	{
+	  runable = *t;
+	  ++count;
+	}
+    }
+
+  if (count != 1)
+    error ("Don't know how to %s.  Try \"help target\".", do_mesg);
+
+  return runable;
+}
+
+void
+find_default_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  struct target_ops *t;
+
+  t = find_default_run_target("attach");
+  (t->to_attach) (args, from_tty);
+  return;
+}
+
+void
+find_default_require_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  struct target_ops *t;
+
+  t = find_default_run_target("require_attach");
+  (t->to_require_attach) (args, from_tty);
+  return;
+}
+
+void
+find_default_require_detach (pid, args, from_tty)
+  int  pid;
+  char *  args;
+  int  from_tty;
+{
+  struct target_ops *t;
+
+  t = find_default_run_target("require_detach");
+  (t->to_require_detach) (pid, args, from_tty);
+  return;
+}
+
+void
+find_default_create_inferior (exec_file, allargs, env)
+     char *exec_file;
+     char *allargs;
+     char **env;
+{
+  struct target_ops *t;
+
+  t = find_default_run_target("run");
+  (t->to_create_inferior) (exec_file, allargs, env);
+  return;
+}
+
+void
+find_default_clone_and_follow_inferior (child_pid, followed_child)
+  int  child_pid;
+  int  *followed_child;
+{
+  struct target_ops *t;
+
+  t = find_default_run_target("run");
+  (t->to_clone_and_follow_inferior) (child_pid, followed_child);
+  return;
+}
+
+static int
+return_zero ()
+{
+  return 0;
+}
+
+static int
+return_one ()
+{
+  return 1;
+}
+
+struct target_ops *
+find_core_target ()
+{
+  struct target_ops **t;
+  struct target_ops *runable = NULL;
+  int count;
+  
+  count = 0;
+  
+  for (t = target_structs; t < target_structs + target_struct_size;
+       ++t)
+    {
+      if ((*t)->to_stratum == core_stratum)
+	{
+	  runable = *t;
+	  ++count;
+	}
+    }
+  
+  return(count == 1 ? runable : NULL);
+}
+
+/* The inferior process has died.  Long live the inferior!  */
+
+void
+generic_mourn_inferior ()
+{
+  extern int show_breakpoint_hit_counts;
+
+  inferior_pid = 0;
+  attach_flag = 0;
+  breakpoint_init_inferior (inf_exited);
+  registers_changed ();
+
+#ifdef CLEAR_DEFERRED_STORES
+  /* Delete any pending stores to the inferior... */
+  CLEAR_DEFERRED_STORES;
+#endif
+
+  reopen_exec_file ();
+  reinit_frame_cache ();
+
+  /* It is confusing to the user for ignore counts to stick around
+     from previous runs of the inferior.  So clear them.  */
+  /* However, it is more confusing for the ignore counts to disappear when
+     using hit counts.  So don't clear them if we're counting hits.  */
+  if (!show_breakpoint_hit_counts)
+    breakpoint_clear_ignore_counts ();
+}
+
+/* This table must match in order and size the signals in enum target_signal
+   in target.h.  */
+static struct {
+  char *name;
+  char *string;
+  } signals [] =
+{
+  {"0", "Signal 0"},
+  {"SIGHUP", "Hangup"},
+  {"SIGINT", "Interrupt"},
+  {"SIGQUIT", "Quit"},
+  {"SIGILL", "Illegal instruction"},
+  {"SIGTRAP", "Trace/breakpoint trap"},
+  {"SIGABRT", "Aborted"},
+  {"SIGEMT", "Emulation trap"},
+  {"SIGFPE", "Arithmetic exception"},
+  {"SIGKILL", "Killed"},
+  {"SIGBUS", "Bus error"},
+  {"SIGSEGV", "Segmentation fault"},
+  {"SIGSYS", "Bad system call"},
+  {"SIGPIPE", "Broken pipe"},
+  {"SIGALRM", "Alarm clock"},
+  {"SIGTERM", "Terminated"},
+  {"SIGURG", "Urgent I/O condition"},
+  {"SIGSTOP", "Stopped (signal)"},
+  {"SIGTSTP", "Stopped (user)"},
+  {"SIGCONT", "Continued"},
+  {"SIGCHLD", "Child status changed"},
+  {"SIGTTIN", "Stopped (tty input)"},
+  {"SIGTTOU", "Stopped (tty output)"},
+  {"SIGIO", "I/O possible"},
+  {"SIGXCPU", "CPU time limit exceeded"},
+  {"SIGXFSZ", "File size limit exceeded"},
+  {"SIGVTALRM", "Virtual timer expired"},
+  {"SIGPROF", "Profiling timer expired"},
+  {"SIGWINCH", "Window size changed"},
+  {"SIGLOST", "Resource lost"},
+  {"SIGUSR1", "User defined signal 1"},
+  {"SIGUSR2", "User defined signal 2"},
+  {"SIGPWR", "Power fail/restart"},
+  {"SIGPOLL", "Pollable event occurred"},
+  {"SIGWIND", "SIGWIND"},
+  {"SIGPHONE", "SIGPHONE"},
+  {"SIGWAITING", "Process's LWPs are blocked"},
+  {"SIGLWP", "Signal LWP"},
+  {"SIGDANGER", "Swap space dangerously low"},
+  {"SIGGRANT", "Monitor mode granted"},
+  {"SIGRETRACT", "Need to relinquish monitor mode"},
+  {"SIGMSG", "Monitor mode data available"},
+  {"SIGSOUND", "Sound completed"},
+  {"SIGSAK", "Secure attention"},
+  {"SIGPRIO", "SIGPRIO"},
+  {"SIG33", "Real-time event 33"},
+  {"SIG34", "Real-time event 34"},
+  {"SIG35", "Real-time event 35"},
+  {"SIG36", "Real-time event 36"},
+  {"SIG37", "Real-time event 37"},
+  {"SIG38", "Real-time event 38"},
+  {"SIG39", "Real-time event 39"},
+  {"SIG40", "Real-time event 40"},
+  {"SIG41", "Real-time event 41"},
+  {"SIG42", "Real-time event 42"},
+  {"SIG43", "Real-time event 43"},
+  {"SIG44", "Real-time event 44"},
+  {"SIG45", "Real-time event 45"},
+  {"SIG46", "Real-time event 46"},
+  {"SIG47", "Real-time event 47"},
+  {"SIG48", "Real-time event 48"},
+  {"SIG49", "Real-time event 49"},
+  {"SIG50", "Real-time event 50"},
+  {"SIG51", "Real-time event 51"},
+  {"SIG52", "Real-time event 52"},
+  {"SIG53", "Real-time event 53"},
+  {"SIG54", "Real-time event 54"},
+  {"SIG55", "Real-time event 55"},
+  {"SIG56", "Real-time event 56"},
+  {"SIG57", "Real-time event 57"},
+  {"SIG58", "Real-time event 58"},
+  {"SIG59", "Real-time event 59"},
+  {"SIG60", "Real-time event 60"},
+  {"SIG61", "Real-time event 61"},
+  {"SIG62", "Real-time event 62"},
+  {"SIG63", "Real-time event 63"},
+
+#if defined(MACH) || defined(__MACH__)
+  /* Mach exceptions */
+  {"EXC_BAD_ACCESS", "Could not access memory"},
+  {"EXC_BAD_INSTRUCTION", "Illegal instruction/operand"},
+  {"EXC_ARITHMETIC", "Arithmetic exception"},
+  {"EXC_EMULATION", "Emulation instruction"},
+  {"EXC_SOFTWARE", "Software generated exception"},
+  {"EXC_BREAKPOINT", "Breakpoint"},
+#endif
+  {NULL, "Unknown signal"},
+  {NULL, "Internal error: printing TARGET_SIGNAL_DEFAULT"},
+
+  /* Last entry, used to check whether the table is the right size.  */
+  {NULL, "TARGET_SIGNAL_MAGIC"}
+};
+
+/* Return the string for a signal.  */
+char *
+target_signal_to_string (sig)
+     enum target_signal sig;
+{
+  return signals[sig].string;
+}
+
+/* Return the name for a signal.  */
+char *
+target_signal_to_name (sig)
+     enum target_signal sig;
+{
+  if (sig == TARGET_SIGNAL_UNKNOWN)
+    /* I think the code which prints this will always print it along with
+       the string, so no need to be verbose.  */
+    return "?";
+  return signals[sig].name;
+}
+
+/* Given a name, return its signal.  */
+enum target_signal
+target_signal_from_name (name)
+     char *name;
+{
+  enum target_signal sig;
+
+  /* It's possible we also should allow "SIGCLD" as well as "SIGCHLD"
+     for TARGET_SIGNAL_SIGCHLD.  SIGIOT, on the other hand, is more
+     questionable; seems like by now people should call it SIGABRT
+     instead.  */
+
+  /* This ugly cast brought to you by the native VAX compiler.  */
+  for (sig = TARGET_SIGNAL_HUP;
+       signals[sig].name != NULL;
+       sig = (enum target_signal)((int)sig + 1))
+    if (STREQ (name, signals[sig].name))
+      return sig;
+  return TARGET_SIGNAL_UNKNOWN;
+}
+
+/* The following functions are to help certain targets deal
+   with the signal/waitstatus stuff.  They could just as well be in
+   a file called native-utils.c or unixwaitstatus-utils.c or whatever.  */
+
+/* Convert host signal to our signals.  */
+enum target_signal
+target_signal_from_host (hostsig)
+     int hostsig;
+{
+  /* A switch statement would make sense but would require special kludges
+     to deal with the cases where more than one signal has the same number.  */
+
+  if (hostsig == 0) return TARGET_SIGNAL_0;
+
+#if defined (SIGHUP)
+  if (hostsig == SIGHUP) return TARGET_SIGNAL_HUP;
+#endif
+#if defined (SIGINT)
+  if (hostsig == SIGINT) return TARGET_SIGNAL_INT;
+#endif
+#if defined (SIGQUIT)
+  if (hostsig == SIGQUIT) return TARGET_SIGNAL_QUIT;
+#endif
+#if defined (SIGILL)
+  if (hostsig == SIGILL) return TARGET_SIGNAL_ILL;
+#endif
+#if defined (SIGTRAP)
+  if (hostsig == SIGTRAP) return TARGET_SIGNAL_TRAP;
+#endif
+#if defined (SIGABRT)
+  if (hostsig == SIGABRT) return TARGET_SIGNAL_ABRT;
+#endif
+#if defined (SIGEMT)
+  if (hostsig == SIGEMT) return TARGET_SIGNAL_EMT;
+#endif
+#if defined (SIGFPE)
+  if (hostsig == SIGFPE) return TARGET_SIGNAL_FPE;
+#endif
+#if defined (SIGKILL)
+  if (hostsig == SIGKILL) return TARGET_SIGNAL_KILL;
+#endif
+#if defined (SIGBUS)
+  if (hostsig == SIGBUS) return TARGET_SIGNAL_BUS;
+#endif
+#if defined (SIGSEGV)
+  if (hostsig == SIGSEGV) return TARGET_SIGNAL_SEGV;
+#endif
+#if defined (SIGSYS)
+  if (hostsig == SIGSYS) return TARGET_SIGNAL_SYS;
+#endif
+#if defined (SIGPIPE)
+  if (hostsig == SIGPIPE) return TARGET_SIGNAL_PIPE;
+#endif
+#if defined (SIGALRM)
+  if (hostsig == SIGALRM) return TARGET_SIGNAL_ALRM;
+#endif
+#if defined (SIGTERM)
+  if (hostsig == SIGTERM) return TARGET_SIGNAL_TERM;
+#endif
+#if defined (SIGUSR1)
+  if (hostsig == SIGUSR1) return TARGET_SIGNAL_USR1;
+#endif
+#if defined (SIGUSR2)
+  if (hostsig == SIGUSR2) return TARGET_SIGNAL_USR2;
+#endif
+#if defined (SIGCLD)
+  if (hostsig == SIGCLD) return TARGET_SIGNAL_CHLD;
+#endif
+#if defined (SIGCHLD)
+  if (hostsig == SIGCHLD) return TARGET_SIGNAL_CHLD;
+#endif
+#if defined (SIGPWR)
+  if (hostsig == SIGPWR) return TARGET_SIGNAL_PWR;
+#endif
+#if defined (SIGWINCH)
+  if (hostsig == SIGWINCH) return TARGET_SIGNAL_WINCH;
+#endif
+#if defined (SIGURG)
+  if (hostsig == SIGURG) return TARGET_SIGNAL_URG;
+#endif
+#if defined (SIGIO)
+  if (hostsig == SIGIO) return TARGET_SIGNAL_IO;
+#endif
+#if defined (SIGPOLL)
+  if (hostsig == SIGPOLL) return TARGET_SIGNAL_POLL;
+#endif
+#if defined (SIGSTOP)
+  if (hostsig == SIGSTOP) return TARGET_SIGNAL_STOP;
+#endif
+#if defined (SIGTSTP)
+  if (hostsig == SIGTSTP) return TARGET_SIGNAL_TSTP;
+#endif
+#if defined (SIGCONT)
+  if (hostsig == SIGCONT) return TARGET_SIGNAL_CONT;
+#endif
+#if defined (SIGTTIN)
+  if (hostsig == SIGTTIN) return TARGET_SIGNAL_TTIN;
+#endif
+#if defined (SIGTTOU)
+  if (hostsig == SIGTTOU) return TARGET_SIGNAL_TTOU;
+#endif
+#if defined (SIGVTALRM)
+  if (hostsig == SIGVTALRM) return TARGET_SIGNAL_VTALRM;
+#endif
+#if defined (SIGPROF)
+  if (hostsig == SIGPROF) return TARGET_SIGNAL_PROF;
+#endif
+#if defined (SIGXCPU)
+  if (hostsig == SIGXCPU) return TARGET_SIGNAL_XCPU;
+#endif
+#if defined (SIGXFSZ)
+  if (hostsig == SIGXFSZ) return TARGET_SIGNAL_XFSZ;
+#endif
+#if defined (SIGWIND)
+  if (hostsig == SIGWIND) return TARGET_SIGNAL_WIND;
+#endif
+#if defined (SIGPHONE)
+  if (hostsig == SIGPHONE) return TARGET_SIGNAL_PHONE;
+#endif
+#if defined (SIGLOST)
+  if (hostsig == SIGLOST) return TARGET_SIGNAL_LOST;
+#endif
+#if defined (SIGWAITING)
+  if (hostsig == SIGWAITING) return TARGET_SIGNAL_WAITING;
+#endif
+#if defined (SIGLWP)
+  if (hostsig == SIGLWP) return TARGET_SIGNAL_LWP;
+#endif
+#if defined (SIGDANGER)
+  if (hostsig == SIGDANGER) return TARGET_SIGNAL_DANGER;
+#endif
+#if defined (SIGGRANT)
+  if (hostsig == SIGGRANT) return TARGET_SIGNAL_GRANT;
+#endif
+#if defined (SIGRETRACT)
+  if (hostsig == SIGRETRACT) return TARGET_SIGNAL_RETRACT;
+#endif
+#if defined (SIGMSG)
+  if (hostsig == SIGMSG) return TARGET_SIGNAL_MSG;
+#endif
+#if defined (SIGSOUND)
+  if (hostsig == SIGSOUND) return TARGET_SIGNAL_SOUND;
+#endif
+#if defined (SIGSAK)
+  if (hostsig == SIGSAK) return TARGET_SIGNAL_SAK;
+#endif
+#if defined (SIGPRIO)
+  if (hostsig == SIGPRIO) return TARGET_SIGNAL_PRIO;
+#endif
+
+  /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_ACCESS) return TARGET_EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BAD_INSTRUCTION) return TARGET_EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_ARITHMETIC) return TARGET_EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_EMULATION) return TARGET_EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_SOFTWARE) return TARGET_EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+  if (hostsig == _NSIG + EXC_BREAKPOINT) return TARGET_EXC_BREAKPOINT;
+#endif
+
+#if defined (REALTIME_LO)
+  if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
+    return (enum target_signal)
+      (hostsig - 33 + (int) TARGET_SIGNAL_REALTIME_33);
+#endif
+  return TARGET_SIGNAL_UNKNOWN;
+}
+
+int
+target_signal_to_host (oursig)
+     enum target_signal oursig;
+{
+  switch (oursig)
+    {
+    case TARGET_SIGNAL_0: return 0;
+
+#if defined (SIGHUP)
+    case TARGET_SIGNAL_HUP: return SIGHUP;
+#endif
+#if defined (SIGINT)
+    case TARGET_SIGNAL_INT: return SIGINT;
+#endif
+#if defined (SIGQUIT)
+    case TARGET_SIGNAL_QUIT: return SIGQUIT;
+#endif
+#if defined (SIGILL)
+    case TARGET_SIGNAL_ILL: return SIGILL;
+#endif
+#if defined (SIGTRAP)
+    case TARGET_SIGNAL_TRAP: return SIGTRAP;
+#endif
+#if defined (SIGABRT)
+    case TARGET_SIGNAL_ABRT: return SIGABRT;
+#endif
+#if defined (SIGEMT)
+    case TARGET_SIGNAL_EMT: return SIGEMT;
+#endif
+#if defined (SIGFPE)
+    case TARGET_SIGNAL_FPE: return SIGFPE;
+#endif
+#if defined (SIGKILL)
+    case TARGET_SIGNAL_KILL: return SIGKILL;
+#endif
+#if defined (SIGBUS)
+    case TARGET_SIGNAL_BUS: return SIGBUS;
+#endif
+#if defined (SIGSEGV)
+    case TARGET_SIGNAL_SEGV: return SIGSEGV;
+#endif
+#if defined (SIGSYS)
+    case TARGET_SIGNAL_SYS: return SIGSYS;
+#endif
+#if defined (SIGPIPE)
+    case TARGET_SIGNAL_PIPE: return SIGPIPE;
+#endif
+#if defined (SIGALRM)
+    case TARGET_SIGNAL_ALRM: return SIGALRM;
+#endif
+#if defined (SIGTERM)
+    case TARGET_SIGNAL_TERM: return SIGTERM;
+#endif
+#if defined (SIGUSR1)
+    case TARGET_SIGNAL_USR1: return SIGUSR1;
+#endif
+#if defined (SIGUSR2)
+    case TARGET_SIGNAL_USR2: return SIGUSR2;
+#endif
+#if defined (SIGCHLD) || defined (SIGCLD)
+    case TARGET_SIGNAL_CHLD: 
+#if defined (SIGCHLD)
+      return SIGCHLD;
+#else
+      return SIGCLD;
+#endif
+#endif /* SIGCLD or SIGCHLD */
+#if defined (SIGPWR)
+    case TARGET_SIGNAL_PWR: return SIGPWR;
+#endif
+#if defined (SIGWINCH)
+    case TARGET_SIGNAL_WINCH: return SIGWINCH;
+#endif
+#if defined (SIGURG)
+    case TARGET_SIGNAL_URG: return SIGURG;
+#endif
+#if defined (SIGIO)
+    case TARGET_SIGNAL_IO: return SIGIO;
+#endif
+#if defined (SIGPOLL)
+    case TARGET_SIGNAL_POLL: return SIGPOLL;
+#endif
+#if defined (SIGSTOP)
+    case TARGET_SIGNAL_STOP: return SIGSTOP;
+#endif
+#if defined (SIGTSTP)
+    case TARGET_SIGNAL_TSTP: return SIGTSTP;
+#endif
+#if defined (SIGCONT)
+    case TARGET_SIGNAL_CONT: return SIGCONT;
+#endif
+#if defined (SIGTTIN)
+    case TARGET_SIGNAL_TTIN: return SIGTTIN;
+#endif
+#if defined (SIGTTOU)
+    case TARGET_SIGNAL_TTOU: return SIGTTOU;
+#endif
+#if defined (SIGVTALRM)
+    case TARGET_SIGNAL_VTALRM: return SIGVTALRM;
+#endif
+#if defined (SIGPROF)
+    case TARGET_SIGNAL_PROF: return SIGPROF;
+#endif
+#if defined (SIGXCPU)
+    case TARGET_SIGNAL_XCPU: return SIGXCPU;
+#endif
+#if defined (SIGXFSZ)
+    case TARGET_SIGNAL_XFSZ: return SIGXFSZ;
+#endif
+#if defined (SIGWIND)
+    case TARGET_SIGNAL_WIND: return SIGWIND;
+#endif
+#if defined (SIGPHONE)
+    case TARGET_SIGNAL_PHONE: return SIGPHONE;
+#endif
+#if defined (SIGLOST)
+    case TARGET_SIGNAL_LOST: return SIGLOST;
+#endif
+#if defined (SIGWAITING)
+    case TARGET_SIGNAL_WAITING: return SIGWAITING;
+#endif
+#if defined (SIGLWP)
+    case TARGET_SIGNAL_LWP: return SIGLWP;
+#endif
+#if defined (SIGDANGER)
+    case TARGET_SIGNAL_DANGER: return SIGDANGER;
+#endif
+#if defined (SIGGRANT)
+    case TARGET_SIGNAL_GRANT: return SIGGRANT;
+#endif
+#if defined (SIGRETRACT)
+    case TARGET_SIGNAL_RETRACT: return SIGRETRACT;
+#endif
+#if defined (SIGMSG)
+    case TARGET_SIGNAL_MSG: return SIGMSG;
+#endif
+#if defined (SIGSOUND)
+    case TARGET_SIGNAL_SOUND: return SIGSOUND;
+#endif
+#if defined (SIGSAK)
+    case TARGET_SIGNAL_SAK: return SIGSAK;
+#endif
+#if defined (SIGPRIO)
+    case TARGET_SIGNAL_PRIO: return SIGPRIO;
+#endif
+
+      /* Mach exceptions.  Assumes that the values for EXC_ are positive! */
+#if defined (EXC_BAD_ACCESS) && defined (_NSIG)
+    case TARGET_EXC_BAD_ACCESS: return _NSIG + EXC_BAD_ACCESS;
+#endif
+#if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
+    case TARGET_EXC_BAD_INSTRUCTION: return _NSIG + EXC_BAD_INSTRUCTION;
+#endif
+#if defined (EXC_ARITHMETIC) && defined (_NSIG)
+    case TARGET_EXC_ARITHMETIC: return _NSIG + EXC_ARITHMETIC;
+#endif
+#if defined (EXC_EMULATION) && defined (_NSIG)
+    case TARGET_EXC_EMULATION: return _NSIG + EXC_EMULATION;
+#endif
+#if defined (EXC_SOFTWARE) && defined (_NSIG)
+    case TARGET_EXC_SOFTWARE: return _NSIG + EXC_SOFTWARE;
+#endif
+#if defined (EXC_BREAKPOINT) && defined (_NSIG)
+    case TARGET_EXC_BREAKPOINT: return _NSIG + EXC_BREAKPOINT;
+#endif
+
+    default:
+#if defined (REALTIME_LO)
+      if (oursig >= TARGET_SIGNAL_REALTIME_33
+	  && oursig <= TARGET_SIGNAL_REALTIME_63)
+	{
+	  int retsig =
+	    (int)oursig - (int)TARGET_SIGNAL_REALTIME_33 + REALTIME_LO;
+	  if (retsig < REALTIME_HI)
+	    return retsig;
+	}
+#endif
+      /* The user might be trying to do "signal SIGSAK" where this system
+	 doesn't have SIGSAK.  */
+      warning ("Signal %s does not exist on this system.\n",
+	       target_signal_to_name (oursig));
+      return 0;
+    }
+}
+
+/* Helper function for child_wait and the Lynx derivatives of child_wait.
+   HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
+   translation of that in OURSTATUS.  */
+void
+store_waitstatus (ourstatus, hoststatus)
+     struct target_waitstatus *ourstatus;
+     int hoststatus;
+{
+#ifdef CHILD_SPECIAL_WAITSTATUS
+  /* CHILD_SPECIAL_WAITSTATUS should return nonzero and set *OURSTATUS
+     if it wants to deal with hoststatus.  */
+  if (CHILD_SPECIAL_WAITSTATUS (ourstatus, hoststatus))
+    return;
+#endif
+
+  if (WIFEXITED (hoststatus))
+    {
+      ourstatus->kind = TARGET_WAITKIND_EXITED;
+      ourstatus->value.integer = WEXITSTATUS (hoststatus);
+    }
+  else if (!WIFSTOPPED (hoststatus))
+    {
+      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+      ourstatus->value.sig = target_signal_from_host (WTERMSIG (hoststatus));
+    }
+  else
+    {
+      ourstatus->kind = TARGET_WAITKIND_STOPPED;
+      ourstatus->value.sig = target_signal_from_host (WSTOPSIG (hoststatus));
+    }
+}
+
+/* In some circumstances we allow a command to specify a numeric
+   signal.  The idea is to keep these circumstances limited so that
+   users (and scripts) develop portable habits.  For comparison,
+   POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
+   numeric signal at all is obscelescent.  We are slightly more
+   lenient and allow 1-15 which should match host signal numbers on
+   most systems.  Use of symbolic signal names is strongly encouraged.  */
+
+enum target_signal
+target_signal_from_command (num)
+     int num;
+{
+  if (num >= 1 && num <= 15)
+    return (enum target_signal)num;
+  error ("Only signals 1-15 are valid as numeric signals.\n\
+Use \"info signals\" for a list of symbolic signals.");
+}
+
+/* Returns zero to leave the inferior alone, one to interrupt it.  */
+int (*target_activity_function) PARAMS ((void));
+int target_activity_fd;
+
+/* Convert a normal process ID to a string.  Returns the string in a static
+   buffer.  */
+
+char *
+normal_pid_to_str (pid)
+     int pid;
+{
+  static char buf[30];
+
+  if (STREQ (current_target.to_shortname, "remote"))
+    sprintf (buf, "thread %d\0", pid);
+  else
+    sprintf (buf, "process %d\0", pid);
+
+  return buf;
+}
+
+/* Some targets (such as ttrace-based HPUX) don't allow us to request
+   notification of inferior events such as fork and vork immediately
+   after the inferior is created.  (This because of how gdb gets an
+   inferior created via invoking a shell to do it.  In such a scenario,
+   if the shell init file has commands in it, the shell will fork and
+   exec for each of those commands, and we will see each such fork
+   event.  Very bad.)
+   
+   This function is used by all targets that allow us to request
+   notification of forks, etc at inferior creation time; e.g., in
+   target_acknowledge_forked_child.
+   */
+void
+normal_target_post_startup_inferior (pid)
+  int  pid;
+{
+  /* This space intentionally left blank. */
+}
+
+/* Set up the handful of non-empty slots needed by the dummy target
+   vector.  */
+
+static void
+init_dummy_target ()
+{
+  dummy_target.to_shortname = "None";
+  dummy_target.to_longname = "None";
+  dummy_target.to_doc = "";
+  dummy_target.to_attach = find_default_attach;
+  dummy_target.to_require_attach = find_default_require_attach;
+  dummy_target.to_require_detach = find_default_require_detach;
+  dummy_target.to_create_inferior = find_default_create_inferior;
+  dummy_target.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior;
+  dummy_target.to_stratum = dummy_stratum;
+  dummy_target.to_magic = OPS_MAGIC;
+}
+
+
+#ifdef MAINTENANCE_CMDS
+static struct target_ops debug_target;
+
+static void
+debug_to_open (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  debug_target.to_open (args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr, "target_open (%s, %d)\n", args, from_tty);
+}
+
+static void
+debug_to_close (quitting)
+     int quitting;
+{
+  debug_target.to_close (quitting);
+
+  fprintf_unfiltered (gdb_stderr, "target_close (%d)\n", quitting);
+}
+
+static void
+debug_to_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  debug_target.to_attach (args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr, "target_attach (%s, %d)\n", args, from_tty);
+}
+
+
+static void
+debug_to_post_attach (pid)
+  int  pid;
+{
+  debug_target.to_post_attach (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_post_attach (%d)\n", pid);
+}
+
+static void
+debug_to_require_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  debug_target.to_require_attach (args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_require_attach (%s, %d)\n", args, from_tty);
+}
+
+static void
+debug_to_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  debug_target.to_detach (args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr, "target_detach (%s, %d)\n", args, from_tty);
+}
+
+static void
+debug_to_require_detach (pid, args, from_tty)
+  int  pid;
+  char *  args;
+  int  from_tty;
+{
+  debug_target.to_require_detach (pid, args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_require_detach (%d, %s, %d)\n", pid, args, from_tty);
+}
+
+static void
+debug_to_resume (pid, step, siggnal)
+     int pid;
+     int step;
+     enum target_signal siggnal;
+{
+  debug_target.to_resume (pid, step, siggnal);
+
+  fprintf_unfiltered (gdb_stderr, "target_resume (%d, %s, %s)\n", pid,
+		      step ? "step" : "continue",
+		      target_signal_to_name (siggnal));
+}
+
+static int
+debug_to_wait (pid, status)
+     int pid;
+     struct target_waitstatus *status;
+{
+  int retval;
+
+  retval = debug_target.to_wait (pid, status);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_wait (%d, status) = %d,   ", pid, retval);
+  fprintf_unfiltered (gdb_stderr, "status->kind = ");
+  switch (status->kind)
+    {
+    case TARGET_WAITKIND_EXITED:
+      fprintf_unfiltered (gdb_stderr, "exited, status = %d\n",
+			  status->value.integer);
+      break;
+    case TARGET_WAITKIND_STOPPED:
+      fprintf_unfiltered (gdb_stderr, "stopped, signal = %s\n",
+			  target_signal_to_name (status->value.sig));
+      break;
+    case TARGET_WAITKIND_SIGNALLED:
+      fprintf_unfiltered (gdb_stderr, "signalled, signal = %s\n",
+			  target_signal_to_name (status->value.sig));
+      break;
+    case TARGET_WAITKIND_LOADED:
+      fprintf_unfiltered (gdb_stderr, "loaded\n");
+      break;
+    case TARGET_WAITKIND_FORKED:
+      fprintf_unfiltered (gdb_stderr, "forked\n");
+      break;
+    case TARGET_WAITKIND_VFORKED:
+      fprintf_unfiltered (gdb_stderr, "vforked\n");
+      break;
+    case TARGET_WAITKIND_EXECD:
+      fprintf_unfiltered (gdb_stderr, "execd\n");
+      break;
+    case TARGET_WAITKIND_SPURIOUS:
+      fprintf_unfiltered (gdb_stderr, "spurious\n");
+      break;
+    default:
+      fprintf_unfiltered (gdb_stderr, "unknown???\n");
+      break;
+    }
+
+  return retval;
+}
+
+static void
+debug_to_post_wait (pid, status)
+  int  pid;
+  int  status;
+{
+  debug_target.to_post_wait (pid, status);
+
+  fprintf_unfiltered (gdb_stderr, "target_post_wait (%d, %d)\n",
+		      pid, status);
+}
+
+static void
+debug_to_fetch_registers (regno)
+     int regno;
+{
+  debug_target.to_fetch_registers (regno);
+
+  fprintf_unfiltered (gdb_stderr, "target_fetch_registers (%s)",
+		      regno != -1 ? REGISTER_NAME (regno) : "-1");
+  if (regno != -1)
+    fprintf_unfiltered (gdb_stderr, " = 0x%x %d",
+			(unsigned long) read_register (regno),
+			read_register (regno));
+  fprintf_unfiltered (gdb_stderr, "\n");
+}
+
+static void
+debug_to_store_registers (regno)
+     int regno;
+{
+  debug_target.to_store_registers (regno);
+
+  if (regno >= 0 && regno < NUM_REGS)
+    fprintf_unfiltered (gdb_stderr, "target_store_registers (%s) = 0x%x %d\n",
+			REGISTER_NAME (regno),
+			(unsigned long) read_register (regno),
+			(unsigned long) read_register (regno));
+  else
+    fprintf_unfiltered (gdb_stderr, "target_store_registers (%d)\n", regno);
+}
+
+static void
+debug_to_prepare_to_store ()
+{
+  debug_target.to_prepare_to_store ();
+
+  fprintf_unfiltered (gdb_stderr, "target_prepare_to_store ()\n");
+}
+
+static int
+debug_to_xfer_memory (memaddr, myaddr, len, write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     struct target_ops *target;
+{
+  int retval;
+
+  retval = debug_target.to_xfer_memory (memaddr, myaddr, len, write, target);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_xfer_memory (0x%x, xxx, %d, %s, xxx) = %d",
+		      (unsigned int) memaddr, /* possable truncate long long */
+		      len, write ? "write" : "read", retval);
+
+  
+
+  if (retval > 0)
+    {
+      int i;
+
+      fputs_unfiltered (", bytes =", gdb_stderr);
+      for (i = 0; i < retval; i++)
+	{
+	  if ((((long) &(myaddr[i])) & 0xf) == 0)
+	    fprintf_unfiltered (gdb_stderr, "\n");
+	  fprintf_unfiltered (gdb_stderr, " %02x", myaddr[i] & 0xff);
+	}
+    }
+
+  fputc_unfiltered ('\n', gdb_stderr);
+
+  return retval;
+}
+
+static void
+debug_to_files_info (target)
+     struct target_ops *target;
+{
+  debug_target.to_files_info (target);
+
+  fprintf_unfiltered (gdb_stderr, "target_files_info (xxx)\n");
+}
+
+static int
+debug_to_insert_breakpoint (addr, save)
+     CORE_ADDR addr;
+     char *save;
+{
+  int retval;
+
+  retval = debug_target.to_insert_breakpoint (addr, save);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_insert_breakpoint (0x%x, xxx) = %d\n",
+		      (unsigned long) addr, retval);
+  return retval;
+}
+
+static int
+debug_to_remove_breakpoint (addr, save)
+     CORE_ADDR addr;
+     char *save;
+{
+  int retval;
+
+  retval = debug_target.to_remove_breakpoint (addr, save);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_remove_breakpoint (0x%x, xxx) = %d\n",
+		      (unsigned long)addr, retval);
+  return retval;
+}
+
+static void
+debug_to_terminal_init ()
+{
+  debug_target.to_terminal_init ();
+
+  fprintf_unfiltered (gdb_stderr, "target_terminal_init ()\n");
+}
+
+static void
+debug_to_terminal_inferior ()
+{
+  debug_target.to_terminal_inferior ();
+
+  fprintf_unfiltered (gdb_stderr, "target_terminal_inferior ()\n");
+}
+
+static void
+debug_to_terminal_ours_for_output ()
+{
+  debug_target.to_terminal_ours_for_output ();
+
+  fprintf_unfiltered (gdb_stderr, "target_terminal_ours_for_output ()\n");
+}
+
+static void
+debug_to_terminal_ours ()
+{
+  debug_target.to_terminal_ours ();
+
+  fprintf_unfiltered (gdb_stderr, "target_terminal_ours ()\n");
+}
+
+static void
+debug_to_terminal_info (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  debug_target.to_terminal_info (arg, from_tty);
+
+  fprintf_unfiltered (gdb_stderr, "target_terminal_info (%s, %d)\n", arg,
+		      from_tty);
+}
+
+static void
+debug_to_kill ()
+{
+  debug_target.to_kill ();
+
+  fprintf_unfiltered (gdb_stderr, "target_kill ()\n");
+}
+
+static void
+debug_to_load (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  debug_target.to_load (args, from_tty);
+
+  fprintf_unfiltered (gdb_stderr, "target_load (%s, %d)\n", args, from_tty);
+}
+
+static int
+debug_to_lookup_symbol (name, addrp)
+     char *name;
+     CORE_ADDR *addrp;
+{
+  int retval;
+
+  retval = debug_target.to_lookup_symbol (name, addrp);
+
+  fprintf_unfiltered (gdb_stderr, "target_lookup_symbol (%s, xxx)\n", name);
+
+  return retval;
+}
+
+static void
+debug_to_create_inferior (exec_file, args, env)
+     char *exec_file;
+     char *args;
+     char **env;
+{
+  debug_target.to_create_inferior (exec_file, args, env);
+
+  fprintf_unfiltered (gdb_stderr, "target_create_inferior (%s, %s, xxx)\n",
+		      exec_file, args);
+}
+
+static void
+debug_to_post_startup_inferior (pid)
+  int  pid;
+{
+  debug_target.to_post_startup_inferior (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_post_startup_inferior (%d)\n",
+		      pid);
+}
+
+static void
+debug_to_acknowledge_created_inferior (pid)
+  int  pid;
+{
+  debug_target.to_acknowledge_created_inferior (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_acknowledge_created_inferior (%d)\n",
+		      pid);
+}
+
+static void
+debug_to_clone_and_follow_inferior (child_pid, followed_child)
+  int  child_pid;
+  int  *followed_child;
+{
+  debug_target.to_clone_and_follow_inferior (child_pid, followed_child);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_clone_and_follow_inferior (%d, %d)\n",
+		      child_pid, *followed_child);
+}
+
+static void
+debug_to_post_follow_inferior_by_clone ()
+{
+  debug_target.to_post_follow_inferior_by_clone ();
+
+  fprintf_unfiltered (gdb_stderr, "target_post_follow_inferior_by_clone ()\n");
+}
+
+static int
+debug_to_insert_fork_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_insert_fork_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_insert_fork_catchpoint (%d) = %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_remove_fork_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_remove_fork_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_remove_fork_catchpoint (%d) = %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_insert_vfork_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_insert_vfork_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_insert_vfork_catchpoint (%d)= %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_remove_vfork_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_remove_vfork_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_remove_vfork_catchpoint (%d) = %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_has_forked (pid, child_pid)
+  int  pid;
+  int *  child_pid;
+{
+  int  has_forked;
+
+  has_forked = debug_target.to_has_forked (pid, child_pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_has_forked (%d, %d) = %d\n",
+                      pid, *child_pid, has_forked);
+
+  return has_forked;
+}
+
+static int
+debug_to_has_vforked (pid, child_pid)
+  int  pid;
+  int *  child_pid;
+{
+  int  has_vforked;
+
+  has_vforked = debug_target.to_has_vforked (pid, child_pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_has_vforked (%d, %d) = %d\n",
+                      pid, *child_pid, has_vforked);
+
+  return has_vforked;
+}
+
+static int
+debug_to_can_follow_vfork_prior_to_exec ()
+{
+  int  can_immediately_follow_vfork;
+
+  can_immediately_follow_vfork = debug_target.to_can_follow_vfork_prior_to_exec ();
+
+  fprintf_unfiltered (gdb_stderr, "target_can_follow_vfork_prior_to_exec () = %d\n",
+                      can_immediately_follow_vfork);
+
+  return can_immediately_follow_vfork;
+}
+
+static void
+debug_to_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child)
+  int  parent_pid;
+  int  followed_parent;
+  int  child_pid;
+  int  followed_child;
+{
+  debug_target.to_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_post_follow_vfork (%d, %d, %d, %d)\n",
+                      parent_pid, followed_parent, child_pid, followed_child);
+}
+
+static int
+debug_to_insert_exec_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_insert_exec_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_insert_exec_catchpoint (%d) = %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_remove_exec_catchpoint (pid)
+  int  pid;
+{
+  int  retval;
+
+  retval = debug_target.to_remove_exec_catchpoint (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_remove_exec_catchpoint (%d) = %d\n",
+                      pid, retval);
+
+  return retval;
+}
+
+static int
+debug_to_has_execd (pid, execd_pathname)
+  int  pid;
+  char **  execd_pathname;
+{
+  int  has_execd;
+
+  has_execd = debug_target.to_has_execd (pid, execd_pathname);
+
+  fprintf_unfiltered (gdb_stderr, "target_has_execd (%d, %s) = %d\n",
+                      pid, *execd_pathname, has_execd);
+
+  return has_execd;
+}
+
+static int
+debug_to_reported_exec_events_per_exec_call ()
+{
+  int  reported_exec_events;
+
+  reported_exec_events = debug_target.to_reported_exec_events_per_exec_call ();
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_reported_exec_events_per_exec_call () = %d\n",
+                      reported_exec_events);
+
+  return reported_exec_events;
+}
+
+static int
+debug_to_has_syscall_event (pid, kind, syscall_id)
+  int  pid;
+  enum target_waitkind *  kind;
+  int *  syscall_id;
+{
+  int  has_syscall_event;
+  char *  kind_spelling = "??";
+
+  has_syscall_event = debug_target.to_has_syscall_event (pid, kind, syscall_id);
+  if (has_syscall_event)
+    {
+      switch (*kind)
+        {
+          case TARGET_WAITKIND_SYSCALL_ENTRY:
+            kind_spelling = "SYSCALL_ENTRY";
+            break;
+          case TARGET_WAITKIND_SYSCALL_RETURN:
+            kind_spelling = "SYSCALL_RETURN";
+            break;
+          default:
+            break;
+        }
+    }
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target_has_syscall_event (%d, %s, %d) = %d\n",
+                      pid, kind_spelling, *syscall_id, has_syscall_event);
+
+  return has_syscall_event;
+}
+
+static int
+debug_to_has_exited (pid, wait_status, exit_status)
+  int  pid;
+  int  wait_status;
+  int *  exit_status;
+{
+  int  has_exited;
+
+  has_exited = debug_target.to_has_exited (pid, wait_status, exit_status);
+
+  fprintf_unfiltered (gdb_stderr, "target_has_exited (%d, %d, %d) = %d\n",
+                      pid, wait_status, *exit_status, has_exited);
+
+  return has_exited;
+}
+
+static void
+debug_to_mourn_inferior ()
+{
+  debug_target.to_mourn_inferior ();
+
+  fprintf_unfiltered (gdb_stderr, "target_mourn_inferior ()\n");
+}
+
+static int
+debug_to_can_run ()
+{
+  int retval;
+
+  retval = debug_target.to_can_run ();
+
+  fprintf_unfiltered (gdb_stderr, "target_can_run () = %d\n", retval);
+
+  return retval;
+}
+
+static void
+debug_to_notice_signals (pid)
+     int pid;
+{
+  debug_target.to_notice_signals (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_notice_signals (%d)\n", pid);
+}
+
+static int
+debug_to_thread_alive (pid)
+     int pid;
+{
+  int retval;
+
+  retval = debug_target.to_thread_alive (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_thread_alive (%d) = %d\n",
+		      pid, retval);
+
+  return retval;
+}
+
+static void
+debug_to_stop ()
+{
+  debug_target.to_stop ();
+
+  fprintf_unfiltered (gdb_stderr, "target_stop ()\n");
+}
+
+static int
+debug_to_query (type, req, resp, siz)
+  int type;
+  char *req;
+  char *resp;
+  int *siz;
+{
+  int retval;
+
+  retval = debug_target.to_query (type, req, resp, siz);
+
+  fprintf_unfiltered (gdb_stderr, "target_query (%c, %s, %s,  %d) = %d\n", type, req, resp, *siz, retval);
+
+  return retval;
+}
+
+static struct symtab_and_line *
+debug_to_enable_exception_callback (kind, enable)
+  enum exception_event_kind kind;
+  int enable;
+{
+  debug_target.to_enable_exception_callback (kind, enable);
+
+  fprintf_unfiltered (gdb_stderr,
+		      "target get_exception_callback_sal (%d, %d)\n",
+		      kind, enable);
+}
+
+static struct exception_event_record *
+debug_to_get_current_exception_event ()
+{
+  debug_target.to_get_current_exception_event();
+
+  fprintf_unfiltered (gdb_stderr, "target get_current_exception_event ()\n");
+}
+
+static char *
+debug_to_pid_to_exec_file (pid)
+  int  pid;
+{
+  char *  exec_file;
+
+  exec_file = debug_target.to_pid_to_exec_file (pid);
+
+  fprintf_unfiltered (gdb_stderr, "target_pid_to_exec_file (%d) = %s\n",
+                      pid, exec_file);
+
+  return exec_file;
+}
+
+static char *
+debug_to_core_file_to_sym_file (core)
+  char *  core;
+{
+  char *  sym_file;
+
+  sym_file = debug_target.to_core_file_to_sym_file (core);
+
+  fprintf_unfiltered (gdb_stderr, "target_core_file_to_sym_file (%s) = %s\n",
+                      core, sym_file);
+
+  return sym_file;
+}
+
+static void
+setup_target_debug ()
+{
+  memcpy (&debug_target, &current_target, sizeof debug_target);
+
+  current_target.to_open = debug_to_open;
+  current_target.to_close = debug_to_close;
+  current_target.to_attach = debug_to_attach;
+  current_target.to_post_attach = debug_to_post_attach;
+  current_target.to_require_attach = debug_to_require_attach;
+  current_target.to_detach = debug_to_detach;
+  current_target.to_require_detach = debug_to_require_detach;
+  current_target.to_resume = debug_to_resume;
+  current_target.to_wait = debug_to_wait;
+  current_target.to_post_wait = debug_to_post_wait;
+  current_target.to_fetch_registers = debug_to_fetch_registers;
+  current_target.to_store_registers = debug_to_store_registers;
+  current_target.to_prepare_to_store = debug_to_prepare_to_store;
+  current_target.to_xfer_memory = debug_to_xfer_memory;
+  current_target.to_files_info = debug_to_files_info;
+  current_target.to_insert_breakpoint = debug_to_insert_breakpoint;
+  current_target.to_remove_breakpoint = debug_to_remove_breakpoint;
+  current_target.to_terminal_init = debug_to_terminal_init;
+  current_target.to_terminal_inferior = debug_to_terminal_inferior;
+  current_target.to_terminal_ours_for_output = debug_to_terminal_ours_for_output;
+  current_target.to_terminal_ours = debug_to_terminal_ours;
+  current_target.to_terminal_info = debug_to_terminal_info;
+  current_target.to_kill = debug_to_kill;
+  current_target.to_load = debug_to_load;
+  current_target.to_lookup_symbol = debug_to_lookup_symbol;
+  current_target.to_create_inferior = debug_to_create_inferior;
+  current_target.to_post_startup_inferior = debug_to_post_startup_inferior;
+  current_target.to_acknowledge_created_inferior = debug_to_acknowledge_created_inferior;
+  current_target.to_clone_and_follow_inferior = debug_to_clone_and_follow_inferior;
+  current_target.to_post_follow_inferior_by_clone = debug_to_post_follow_inferior_by_clone;
+  current_target.to_insert_fork_catchpoint = debug_to_insert_fork_catchpoint;
+  current_target.to_remove_fork_catchpoint = debug_to_remove_fork_catchpoint;
+  current_target.to_insert_vfork_catchpoint = debug_to_insert_vfork_catchpoint;
+  current_target.to_remove_vfork_catchpoint = debug_to_remove_vfork_catchpoint;
+  current_target.to_has_forked = debug_to_has_forked;
+  current_target.to_has_vforked = debug_to_has_vforked;
+  current_target.to_can_follow_vfork_prior_to_exec = debug_to_can_follow_vfork_prior_to_exec;
+  current_target.to_post_follow_vfork = debug_to_post_follow_vfork;
+  current_target.to_insert_exec_catchpoint = debug_to_insert_exec_catchpoint;
+  current_target.to_remove_exec_catchpoint = debug_to_remove_exec_catchpoint;
+  current_target.to_has_execd = debug_to_has_execd;
+  current_target.to_reported_exec_events_per_exec_call = debug_to_reported_exec_events_per_exec_call;
+  current_target.to_has_syscall_event = debug_to_has_syscall_event;
+  current_target.to_has_exited = debug_to_has_exited;
+  current_target.to_mourn_inferior = debug_to_mourn_inferior;
+  current_target.to_can_run = debug_to_can_run;
+  current_target.to_notice_signals = debug_to_notice_signals;
+  current_target.to_thread_alive = debug_to_thread_alive;
+  current_target.to_stop = debug_to_stop;
+  current_target.to_query = debug_to_query;
+  current_target.to_enable_exception_callback = debug_to_enable_exception_callback;
+  current_target.to_get_current_exception_event = debug_to_get_current_exception_event;
+  current_target.to_pid_to_exec_file = debug_to_pid_to_exec_file;
+  current_target.to_core_file_to_sym_file = debug_to_core_file_to_sym_file;
+
+}
+#endif /* MAINTENANCE_CMDS */
+
+static char targ_desc[] = 
+    "Names of targets and files being debugged.\n\
+Shows the entire stack of targets currently in use (including the exec-file,\n\
+core-file, and process, if any), as well as the symbol file name.";
+
+void
+initialize_targets ()
+{
+  init_dummy_target ();
+  push_target (&dummy_target);
+
+  add_info ("target", target_info, targ_desc);
+  add_info ("files", target_info, targ_desc);
+
+#ifdef MAINTENANCE_CMDS
+  add_show_from_set (
+     add_set_cmd ("targetdebug", class_maintenance, var_zinteger,
+		  (char *)&targetdebug,
+		 "Set target debugging.\n\
+When non-zero, target debugging is enabled.", &setlist),
+		     &showlist);
+#endif
+
+  if (!STREQ (signals[TARGET_SIGNAL_LAST].string, "TARGET_SIGNAL_MAGIC"))
+    abort ();
+}