X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fremote.c;h=866c5c00f965457803658537fd6c91292ca14f13;hb=fab5aa7c3fe5e60c877469a1e4c9c551e343409e;hp=186c058f33416224a16922121b08aaf5d8085e57;hpb=53ce3c3929c7121f155e0a4a2492c8dba3878dfd;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/remote.c b/gdb/remote.c
index 186c058f33..866c5c00f9 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -1,6 +1,6 @@
 /* Remote target communications for serial-line targets in custom GDB protocol
 
-   Copyright (C) 1988-2013 Free Software Foundation, Inc.
+   Copyright (C) 1988-2014 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -45,8 +45,8 @@
 #include "target-descriptions.h"
 #include "gdb_bfd.h"
 #include "filestuff.h"
+#include "rsp-low.h"
 
-#include <ctype.h>
 #include <sys/time.h>
 
 #include "event-loop.h"
@@ -98,7 +98,8 @@ static void async_handle_remote_sigint_twice (int);
 
 static void remote_files_info (struct target_ops *ignore);
 
-static void remote_prepare_to_store (struct regcache *regcache);
+static void remote_prepare_to_store (struct target_ops *self,
+				     struct regcache *regcache);
 
 static void remote_open (char *name, int from_tty);
 
@@ -106,7 +107,7 @@ static void extended_remote_open (char *name, int from_tty);
 
 static void remote_open_1 (char *, int, struct target_ops *, int extended_p);
 
-static void remote_close (void);
+static void remote_close (struct target_ops *self);
 
 static void remote_mourn (struct target_ops *ops);
 
@@ -124,14 +125,14 @@ static void remote_serial_write (const char *str, int len);
 
 static void remote_kill (struct target_ops *ops);
 
-static int tohex (int nib);
-
-static int remote_can_async_p (void);
+static int remote_can_async_p (struct target_ops *);
 
-static int remote_is_async_p (void);
+static int remote_is_async_p (struct target_ops *);
 
-static void remote_async (void (*callback) (enum inferior_event_type event_type,
-					    void *context), void *context);
+static void remote_async (struct target_ops *ops,
+			  void (*callback) (enum inferior_event_type event_type,
+					    void *context),
+			  void *context);
 
 static void sync_remote_interrupt_twice (int signo);
 
@@ -152,9 +153,7 @@ static void init_remote_ops (void);
 
 static void init_extended_remote_ops (void);
 
-static void remote_stop (ptid_t);
-
-static int ishex (int ch, int *val);
+static void remote_stop (struct target_ops *self, ptid_t);
 
 static int stubhex (int ch);
 
@@ -176,8 +175,6 @@ static ptid_t remote_current_thread (ptid_t oldptid);
 
 static void remote_find_new_threads (void);
 
-static int fromhex (int a);
-
 static int putpkt_binary (char *buf, int cnt);
 
 static void check_binary_download (CORE_ADDR addr);
@@ -223,15 +220,15 @@ static int peek_stop_reply (ptid_t ptid);
 
 static void remote_async_inferior_event_handler (gdb_client_data);
 
-static void remote_terminal_ours (void);
+static void remote_terminal_ours (struct target_ops *self);
 
 static int remote_read_description_p (struct target_ops *target);
 
 static void remote_console_output (char *msg);
 
-static int remote_supports_cond_breakpoints (void);
+static int remote_supports_cond_breakpoints (struct target_ops *self);
 
-static int remote_can_run_breakpoint_commands (void);
+static int remote_can_run_breakpoint_commands (struct target_ops *self);
 
 /* For "remote".  */
 
@@ -1562,7 +1559,18 @@ remote_add_inferior (int fake_pid_p, int pid, int attached)
 static void
 remote_add_thread (ptid_t ptid, int running)
 {
-  add_thread (ptid);
+  struct remote_state *rs = get_remote_state ();
+
+  /* GDB historically didn't pull threads in the initial connection
+     setup.  If the remote target doesn't even have a concept of
+     threads (e.g., a bare-metal target), even if internally we
+     consider that a single-threaded target, mentioning a new thread
+     might be confusing to the user.  Be silent then, preserving the
+     age old behavior.  */
+  if (rs->starting_up)
+    add_thread_silent (ptid);
+  else
+    add_thread (ptid);
 
   set_executing (ptid, running);
   set_running (ptid, running);
@@ -1640,9 +1648,15 @@ remote_notice_new_inferior (ptid_t currthread, int running)
 
       /* If we found a new inferior, let the common code do whatever
 	 it needs to with it (e.g., read shared libraries, insert
-	 breakpoints).  */
+	 breakpoints), unless we're just setting up an all-stop
+	 connection.  */
       if (inf != NULL)
-	notice_new_inferior (currthread, running, 0);
+	{
+	  struct remote_state *rs = get_remote_state ();
+
+	  if (non_stop || !rs->starting_up)
+	    notice_new_inferior (currthread, running, 0);
+	}
     }
 }
 
@@ -1681,7 +1695,8 @@ record_currthread (struct remote_state *rs, ptid_t currthread)
    it can simply pass through to the inferior without reporting.  */
 
 static void
-remote_pass_signals (int numsigs, unsigned char *pass_signals)
+remote_pass_signals (struct target_ops *self,
+		     int numsigs, unsigned char *pass_signals)
 {
   if (remote_protocol_packets[PACKET_QPassSignals].support != PACKET_DISABLE)
     {
@@ -1715,11 +1730,9 @@ remote_pass_signals (int numsigs, unsigned char *pass_signals)
       *p = 0;
       if (!rs->last_pass_packet || strcmp (rs->last_pass_packet, pass_packet))
 	{
-	  char *buf = rs->buf;
-
 	  putpkt (pass_packet);
 	  getpkt (&rs->buf, &rs->buf_size, 0);
-	  packet_ok (buf, &remote_protocol_packets[PACKET_QPassSignals]);
+	  packet_ok (rs->buf, &remote_protocol_packets[PACKET_QPassSignals]);
 	  if (rs->last_pass_packet)
 	    xfree (rs->last_pass_packet);
 	  rs->last_pass_packet = pass_packet;
@@ -1733,7 +1746,8 @@ remote_pass_signals (int numsigs, unsigned char *pass_signals)
    signals it should pass through to the inferior when detaching.  */
 
 static void
-remote_program_signals (int numsigs, unsigned char *signals)
+remote_program_signals (struct target_ops *self,
+			int numsigs, unsigned char *signals)
 {
   if (remote_protocol_packets[PACKET_QProgramSignals].support != PACKET_DISABLE)
     {
@@ -1768,11 +1782,9 @@ remote_program_signals (int numsigs, unsigned char *signals)
       if (!rs->last_program_signals_packet
 	  || strcmp (rs->last_program_signals_packet, packet) != 0)
 	{
-	  char *buf = rs->buf;
-
 	  putpkt (packet);
 	  getpkt (&rs->buf, &rs->buf_size, 0);
-	  packet_ok (buf, &remote_protocol_packets[PACKET_QProgramSignals]);
+	  packet_ok (rs->buf, &remote_protocol_packets[PACKET_QProgramSignals]);
 	  xfree (rs->last_program_signals_packet);
 	  rs->last_program_signals_packet = packet;
 	}
@@ -1924,14 +1936,8 @@ struct gdb_ext_thread_info
 
 #define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES * 2)
 
-char *unpack_varlen_hex (char *buff, ULONGEST *result);
-
 static char *unpack_nibble (char *buf, int *val);
 
-static char *pack_nibble (char *buf, int nibble);
-
-static char *pack_hex_byte (char *pkt, int /* unsigned char */ byte);
-
 static char *unpack_byte (char *buf, int *value);
 
 static char *pack_int (char *buf, int value);
@@ -2058,31 +2064,6 @@ read_ptid (char *buf, char **obuf)
   return ptid_build (pid, 0, tid);
 }
 
-/* Encode 64 bits in 16 chars of hex.  */
-
-static const char hexchars[] = "0123456789abcdef";
-
-static int
-ishex (int ch, int *val)
-{
-  if ((ch >= 'a') && (ch <= 'f'))
-    {
-      *val = ch - 'a' + 10;
-      return 1;
-    }
-  if ((ch >= 'A') && (ch <= 'F'))
-    {
-      *val = ch - 'A' + 10;
-      return 1;
-    }
-  if ((ch >= '0') && (ch <= '9'))
-    {
-      *val = ch - '0';
-      return 1;
-    }
-  return 0;
-}
-
 static int
 stubhex (int ch)
 {
@@ -2112,23 +2093,6 @@ stub_unpack_int (char *buff, int fieldlength)
   return retval;
 }
 
-char *
-unpack_varlen_hex (char *buff,	/* packet to parse */
-		   ULONGEST *result)
-{
-  int nibble;
-  ULONGEST retval = 0;
-
-  while (ishex (*buff, &nibble))
-    {
-      buff++;
-      retval = retval << 4;
-      retval |= nibble & 0x0f;
-    }
-  *result = retval;
-  return buff;
-}
-
 static char *
 unpack_nibble (char *buf, int *val)
 {
@@ -2136,21 +2100,6 @@ unpack_nibble (char *buf, int *val)
   return buf;
 }
 
-static char *
-pack_nibble (char *buf, int nibble)
-{
-  *buf++ = hexchars[(nibble & 0x0f)];
-  return buf;
-}
-
-static char *
-pack_hex_byte (char *pkt, int byte)
-{
-  *pkt++ = hexchars[(byte >> 4) & 0xf];
-  *pkt++ = hexchars[(byte & 0xf)];
-  return pkt;
-}
-
 static char *
 unpack_byte (char *buf, int *value)
 {
@@ -2859,7 +2808,7 @@ remote_threads_info (struct target_ops *ops)
  */
 
 static char *
-remote_threads_extra_info (struct thread_info *tp)
+remote_threads_extra_info (struct target_ops *self, struct thread_info *tp)
 {
   struct remote_state *rs = get_remote_state ();
   int result;
@@ -3020,7 +2969,7 @@ remote_static_tracepoint_markers_by_strid (const char *strid)
 /* Implement the to_get_ada_task_ptid function for the remote targets.  */
 
 static ptid_t
-remote_get_ada_task_ptid (long lwp, long thread)
+remote_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
 {
   return ptid_build (ptid_get_pid (inferior_ptid), 0, lwp);
 }
@@ -3044,7 +2993,7 @@ extended_remote_restart (void)
 /* Clean up connection to a remote debugger.  */
 
 static void
-remote_close (void)
+remote_close (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -3053,7 +3002,7 @@ remote_close (void)
 
   /* Make sure we leave stdin registered in the event loop, and we
      don't leave the async SIGINT signal handler installed.  */
-  remote_terminal_ours ();
+  remote_terminal_ours (self);
 
   serial_close (rs->remote_desc);
   rs->remote_desc = NULL;
@@ -3310,6 +3259,28 @@ stop_reply_extract_thread (char *stop_reply)
   return null_ptid;
 }
 
+/* Determine the remote side's current thread.  If we have a stop
+   reply handy (in WAIT_STATUS), maybe it's a T stop reply with a
+   "thread" register we can extract the current thread from.  If not,
+   ask the remote which is the current thread with qC.  The former
+   method avoids a roundtrip.  */
+
+static ptid_t
+get_current_thread (char *wait_status)
+{
+  ptid_t ptid;
+
+  /* Note we don't use remote_parse_stop_reply as that makes use of
+     the target architecture, which we haven't yet fully determined at
+     this point.  */
+  if (wait_status != NULL)
+    ptid = stop_reply_extract_thread (wait_status);
+  if (ptid_equal (ptid, null_ptid))
+    ptid = remote_current_thread (inferior_ptid);
+
+  return ptid;
+}
+
 /* Query the remote target for which is the current thread/process,
    add it to our tables, and update INFERIOR_PTID.  The caller is
    responsible for setting the state such that the remote end is ready
@@ -3330,18 +3301,8 @@ add_current_inferior_and_thread (char *wait_status)
 
   inferior_ptid = null_ptid;
 
-  /* Now, if we have thread information, update inferior_ptid.  First
-     if we have a stop reply handy, maybe it's a T stop reply with a
-     "thread" register we can extract the current thread from.  If
-     not, ask the remote which is the current thread, with qC.  The
-     former method avoids a roundtrip.  Note we don't use
-     remote_parse_stop_reply as that makes use of the target
-     architecture, which we haven't yet fully determined at this
-     point.  */
-  if (wait_status != NULL)
-    ptid = stop_reply_extract_thread (wait_status);
-  if (ptid_equal (ptid, null_ptid))
-    ptid = remote_current_thread (inferior_ptid);
+  /* Now, if we have thread information, update inferior_ptid.  */
+  ptid = get_current_thread (wait_status);
 
   if (!ptid_equal (ptid, null_ptid))
     {
@@ -3511,10 +3472,35 @@ remote_start_remote (int from_tty, struct target_ops *target, int extended_p)
 	  strcpy (wait_status, rs->buf);
 	}
 
+      /* Fetch thread list.  */
+      target_find_new_threads ();
+
       /* Let the stub know that we want it to return the thread.  */
       set_continue_thread (minus_one_ptid);
 
-      add_current_inferior_and_thread (wait_status);
+      if (thread_count () == 0)
+	{
+	  /* Target has no concept of threads at all.  GDB treats
+	     non-threaded target as single-threaded; add a main
+	     thread.  */
+	  add_current_inferior_and_thread (wait_status);
+	}
+      else
+	{
+	  /* We have thread information; select the thread the target
+	     says should be current.  If we're reconnecting to a
+	     multi-threaded program, this will ideally be the thread
+	     that last reported an event before GDB disconnected.  */
+	  inferior_ptid = get_current_thread (wait_status);
+	  if (ptid_equal (inferior_ptid, null_ptid))
+	    {
+	      /* Odd... The target was able to list threads, but not
+		 tell us which thread was current (no "thread"
+		 register in T stop reply?).  Just pick the first
+		 thread in the thread list then.  */
+	      inferior_ptid = thread_list->ptid;
+	    }
+	}
 
       /* init_wait_for_inferior should be called before get_offsets in order
 	 to manage `inserted' flag in bp loc in a correct state.
@@ -3608,13 +3594,13 @@ remote_start_remote (int from_tty, struct target_ops *target, int extended_p)
       gdb_assert (wait_status == NULL);
 
       /* Report all signals during attach/startup.  */
-      remote_pass_signals (0, NULL);
+      remote_pass_signals (target, 0, NULL);
     }
 
   /* If we connected to a live target, do some additional setup.  */
   if (target_has_execution)
     {
-      if (exec_bfd) 	/* No use without an exec file.  */
+      if (symfile_objfile) 	/* No use without a symbol-file.  */
 	remote_check_symbols ();
     }
 
@@ -4615,68 +4601,6 @@ extended_remote_attach (struct target_ops *ops, char *args, int from_tty)
   extended_remote_attach_1 (ops, args, from_tty);
 }
 
-/* Convert hex digit A to a number.  */
-
-static int
-fromhex (int a)
-{
-  if (a >= '0' && a <= '9')
-    return a - '0';
-  else if (a >= 'a' && a <= 'f')
-    return a - 'a' + 10;
-  else if (a >= 'A' && a <= 'F')
-    return a - 'A' + 10;
-  else
-    error (_("Reply contains invalid hex digit %d"), a);
-}
-
-int
-hex2bin (const char *hex, gdb_byte *bin, int count)
-{
-  int i;
-
-  for (i = 0; i < count; i++)
-    {
-      if (hex[0] == 0 || hex[1] == 0)
-	{
-	  /* Hex string is short, or of uneven length.
-	     Return the count that has been converted so far.  */
-	  return i;
-	}
-      *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
-      hex += 2;
-    }
-  return i;
-}
-
-/* Convert number NIB to a hex digit.  */
-
-static int
-tohex (int nib)
-{
-  if (nib < 10)
-    return '0' + nib;
-  else
-    return 'a' + nib - 10;
-}
-
-int
-bin2hex (const gdb_byte *bin, char *hex, int count)
-{
-  int i;
-
-  /* May use a length, or a nul-terminated string as input.  */
-  if (count == 0)
-    count = strlen ((char *) bin);
-
-  for (i = 0; i < count; i++)
-    {
-      *hex++ = tohex ((*bin >> 4) & 0xf);
-      *hex++ = tohex (*bin++ & 0xf);
-    }
-  *hex = 0;
-  return i;
-}
 
 /* Check for the availability of vCont.  This function should also check
    the response.  */
@@ -5161,7 +5085,7 @@ remote_stop_as (ptid_t ptid)
    will eventually end up here.  */
 
 static void
-remote_stop (ptid_t ptid)
+remote_stop (struct target_ops *self, ptid_t ptid)
 {
   if (remote_debug)
     fprintf_unfiltered (gdb_stdlog, "remote_stop called\n");
@@ -5203,7 +5127,7 @@ Give up (and stop debugging it)? ")))
    is required.  */
 
 static void
-remote_terminal_inferior (void)
+remote_terminal_inferior (struct target_ops *self)
 {
   if (!target_async_permitted)
     /* Nothing to do.  */
@@ -5226,7 +5150,7 @@ remote_terminal_inferior (void)
 }
 
 static void
-remote_terminal_ours (void)
+remote_terminal_ours (struct target_ops *self)
 {
   if (!target_async_permitted)
     /* Nothing to do.  */
@@ -5355,7 +5279,7 @@ static struct notif_event *
 remote_notif_stop_alloc_reply (void)
 {
   struct notif_event *r
-    = (struct notif_event *) XMALLOC (struct stop_reply);
+    = (struct notif_event *) XNEW (struct stop_reply);
 
   r->dtr = stop_reply_dtr;
 
@@ -6413,7 +6337,7 @@ remote_fetch_registers (struct target_ops *ops,
    first.  */
 
 static void
-remote_prepare_to_store (struct regcache *regcache)
+remote_prepare_to_store (struct target_ops *self, struct regcache *regcache)
 {
   struct remote_arch_state *rsa = get_remote_arch_state ();
   int i;
@@ -6629,91 +6553,6 @@ remote_address_masked (CORE_ADDR addr)
   return addr;
 }
 
-/* Convert BUFFER, binary data at least LEN bytes long, into escaped
-   binary data in OUT_BUF.  Set *OUT_LEN to the length of the data
-   encoded in OUT_BUF, and return the number of bytes in OUT_BUF
-   (which may be more than *OUT_LEN due to escape characters).  The
-   total number of bytes in the output buffer will be at most
-   OUT_MAXLEN.  */
-
-static int
-remote_escape_output (const gdb_byte *buffer, int len,
-		      gdb_byte *out_buf, int *out_len,
-		      int out_maxlen)
-{
-  int input_index, output_index;
-
-  output_index = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (b == '$' || b == '#' || b == '}')
-	{
-	  /* These must be escaped.  */
-	  if (output_index + 2 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = '}';
-	  out_buf[output_index++] = b ^ 0x20;
-	}
-      else
-	{
-	  if (output_index + 1 > out_maxlen)
-	    break;
-	  out_buf[output_index++] = b;
-	}
-    }
-
-  *out_len = input_index;
-  return output_index;
-}
-
-/* Convert BUFFER, escaped data LEN bytes long, into binary data
-   in OUT_BUF.  Return the number of bytes written to OUT_BUF.
-   Raise an error if the total number of bytes exceeds OUT_MAXLEN.
-
-   This function reverses remote_escape_output.  It allows more
-   escaped characters than that function does, in particular because
-   '*' must be escaped to avoid the run-length encoding processing
-   in reading packets.  */
-
-static int
-remote_unescape_input (const gdb_byte *buffer, int len,
-		       gdb_byte *out_buf, int out_maxlen)
-{
-  int input_index, output_index;
-  int escaped;
-
-  output_index = 0;
-  escaped = 0;
-  for (input_index = 0; input_index < len; input_index++)
-    {
-      gdb_byte b = buffer[input_index];
-
-      if (output_index + 1 > out_maxlen)
-	{
-	  warning (_("Received too much data from remote target;"
-		     " ignoring overflow."));
-	  return output_index;
-	}
-
-      if (escaped)
-	{
-	  out_buf[output_index++] = b ^ 0x20;
-	  escaped = 0;
-	}
-      else if (b == '}')
-	escaped = 1;
-      else
-	out_buf[output_index++] = b;
-    }
-
-  if (escaped)
-    error (_("Unmatched escape character in target response."));
-
-  return output_index;
-}
-
 /* Determine whether the remote target supports binary downloading.
    This is accomplished by sending a no-op memory write of zero length
    to the target at the specified address. It does not suffice to send
@@ -6788,14 +6627,15 @@ check_binary_download (CORE_ADDR addr)
    If USE_LENGTH is 0, then the <LENGTH> field and the preceding comma
    are omitted.
 
-   Returns the number of bytes transferred, or a negative value (an
-   'enum target_xfer_error' value) for error.  Only transfer a single
-   packet.  */
+   Return the transferred status, error or OK (an
+   'enum target_xfer_status' value).  Save the number of bytes
+   transferred in *XFERED_LEN.  Only transfer a single packet.  */
 
-static LONGEST
+static enum target_xfer_status
 remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
-			const gdb_byte *myaddr, ssize_t len,
-			char packet_format, int use_length)
+			const gdb_byte *myaddr, ULONGEST len,
+			ULONGEST *xfered_len, char packet_format,
+			int use_length)
 {
   struct remote_state *rs = get_remote_state ();
   char *p;
@@ -6811,8 +6651,8 @@ remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
     internal_error (__FILE__, __LINE__,
 		    _("remote_write_bytes_aux: bad packet format"));
 
-  if (len <= 0)
-    return 0;
+  if (len == 0)
+    return TARGET_XFER_EOF;
 
   payload_size = get_memory_write_packet_size ();
 
@@ -6935,7 +6775,8 @@ remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
 
   /* Return NR_BYTES, not TODO, in case escape chars caused us to send
      fewer bytes than we'd planned.  */
-  return nr_bytes;
+  *xfered_len = (ULONGEST) nr_bytes;
+  return TARGET_XFER_OK;
 }
 
 /* Write memory data directly to the remote machine.
@@ -6944,12 +6785,13 @@ remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
    MYADDR is the address of the buffer in our space.
    LEN is the number of bytes.
 
-   Returns number of bytes transferred, or a negative value (an 'enum
-   target_xfer_error' value) for error.  Only transfer a single
-   packet.  */
+   Return the transferred status, error or OK (an
+   'enum target_xfer_status' value).  Save the number of bytes
+   transferred in *XFERED_LEN.  Only transfer a single packet.  */
 
-static LONGEST
-remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
+static enum target_xfer_status
+remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, ULONGEST len,
+		    ULONGEST *xfered_len)
 {
   char *packet_format = 0;
 
@@ -6972,7 +6814,8 @@ remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
     }
 
   return remote_write_bytes_aux (packet_format,
-				 memaddr, myaddr, len, packet_format[0], 1);
+				 memaddr, myaddr, len, xfered_len,
+				 packet_format[0], 1);
 }
 
 /* Read memory data directly from the remote machine.
@@ -6981,11 +6824,13 @@ remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len)
    MYADDR is the address of the buffer in our space.
    LEN is the number of bytes.
 
-   Returns number of bytes transferred, or a negative value (an 'enum
-   target_xfer_error' value) for error.  */
+   Return the transferred status, error or OK (an
+   'enum target_xfer_status' value).  Save the number of bytes
+   transferred in *XFERED_LEN.  */
 
-static LONGEST
-remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
+static enum target_xfer_status
+remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, ULONGEST len,
+		   ULONGEST *xfered_len)
 {
   struct remote_state *rs = get_remote_state ();
   int max_buf_size;		/* Max size of packet output buffer.  */
@@ -6993,7 +6838,7 @@ remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
   int todo;
   int i;
 
-  if (len <= 0)
+  if (len == 0)
     return 0;
 
   max_buf_size = get_memory_read_packet_size ();
@@ -7022,7 +6867,8 @@ remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
   p = rs->buf;
   i = hex2bin (p, myaddr, todo);
   /* Return what we have.  Let higher layers handle partial reads.  */
-  return i;
+  *xfered_len = (ULONGEST) i;
+  return TARGET_XFER_OK;
 }
 
 
@@ -7094,18 +6940,19 @@ remote_flash_erase (struct target_ops *ops,
   do_cleanups (back_to);
 }
 
-static LONGEST
-remote_flash_write (struct target_ops *ops,
-                    ULONGEST address, LONGEST length,
-                    const gdb_byte *data)
+static enum target_xfer_status
+remote_flash_write (struct target_ops *ops, ULONGEST address,
+		    ULONGEST length, ULONGEST *xfered_len,
+		    const gdb_byte *data)
 {
   int saved_remote_timeout = remote_timeout;
-  LONGEST ret;
+  enum target_xfer_status ret;
   struct cleanup *back_to = make_cleanup (restore_remote_timeout,
-                                          &saved_remote_timeout);
+					  &saved_remote_timeout);
 
   remote_timeout = remote_flash_timeout;
-  ret = remote_write_bytes_aux ("vFlashWrite:", address, data, length, 'X', 0);
+  ret = remote_write_bytes_aux ("vFlashWrite:", address, data, length,
+				xfered_len,'X', 0);
   do_cleanups (back_to);
 
   return ret;
@@ -7690,7 +7537,7 @@ getpkt_or_notif_sane_1 (char **buf, long *sizeof_buf, int forever,
      we get a packet.  */
   for (;;)
     {
-      /* If we get a timeout or bad checksm, retry up to MAX_TRIES
+      /* If we get a timeout or bad checksum, retry up to MAX_TRIES
 	 times.  */
       for (tries = 1; tries <= MAX_TRIES; tries++)
 	{
@@ -7816,23 +7663,39 @@ getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever,
 }
 
 
-/* A helper function that just calls putpkt; for type correctness.  */
-
-static int
-putpkt_for_catch_errors (void *arg)
-{
-  return putpkt (arg);
-}
-
 static void
 remote_kill (struct target_ops *ops)
 {
-  /* Use catch_errors so the user can quit from gdb even when we
+  volatile struct gdb_exception ex;
+
+  /* Catch errors so the user can quit from gdb even when we
      aren't on speaking terms with the remote system.  */
-  catch_errors (putpkt_for_catch_errors, "k", "", RETURN_MASK_ERROR);
+  TRY_CATCH (ex, RETURN_MASK_ERROR)
+    {
+      putpkt ("k");
+    }
+  if (ex.reason < 0)
+    {
+      if (ex.error == TARGET_CLOSE_ERROR)
+	{
+	  /* If we got an (EOF) error that caused the target
+	     to go away, then we're done, that's what we wanted.
+	     "k" is susceptible to cause a premature EOF, given
+	     that the remote server isn't actually required to
+	     reply to "k", and it can happen that it doesn't
+	     even get to reply ACK to the "k".  */
+	  return;
+	}
 
-  /* Don't wait for it to die.  I'm not really sure it matters whether
-     we do or not.  For the existing stubs, kill is a noop.  */
+	/* Otherwise, something went wrong.  We didn't actually kill
+	   the target.  Just propagate the exception, and let the
+	   user or higher layers decide what to do.  */
+	throw_exception (ex);
+    }
+
+  /* We've killed the remote end, we get to mourn it.  Since this is
+     target remote, single-process, mourning the inferior also
+     unpushes remote_ops.  */
   target_mourn_inferior ();
 }
 
@@ -7971,7 +7834,7 @@ extended_remote_mourn (struct target_ops *ops)
 }
 
 static int
-extended_remote_supports_disable_randomization (void)
+extended_remote_supports_disable_randomization (struct target_ops *self)
 {
   return (remote_protocol_packets[PACKET_QDisableRandomization].support
 	  == PACKET_ENABLE);
@@ -8009,7 +7872,8 @@ extended_remote_run (char *args)
 
   if (strlen (remote_exec_file) * 2 + len >= get_remote_packet_size ())
     error (_("Remote file name too long for run packet"));
-  len += 2 * bin2hex ((gdb_byte *) remote_exec_file, rs->buf + len, 0);
+  len += 2 * bin2hex ((gdb_byte *) remote_exec_file, rs->buf + len,
+		      strlen (remote_exec_file));
 
   gdb_assert (args != NULL);
   if (*args)
@@ -8025,7 +7889,8 @@ extended_remote_run (char *args)
 	  if (strlen (argv[i]) * 2 + 1 + len >= get_remote_packet_size ())
 	    error (_("Argument list too long for run packet"));
 	  rs->buf[len++] = ';';
-	  len += 2 * bin2hex ((gdb_byte *) argv[i], rs->buf + len, 0);
+	  len += 2 * bin2hex ((gdb_byte *) argv[i], rs->buf + len,
+			      strlen (argv[i]));
 	}
       do_cleanups (back_to);
     }
@@ -8061,8 +7926,9 @@ extended_remote_run (char *args)
    environment.  */
 
 static void
-extended_remote_create_inferior_1 (char *exec_file, char *args,
-				   char **env, int from_tty)
+extended_remote_create_inferior (struct target_ops *ops,
+				 char *exec_file, char *args,
+				 char **env, int from_tty)
 {
   int run_worked;
   char *stop_reply;
@@ -8074,7 +7940,7 @@ extended_remote_create_inferior_1 (char *exec_file, char *args,
     target_async (inferior_event_handler, 0);
 
   /* Disable address space randomization if requested (and supported).  */
-  if (extended_remote_supports_disable_randomization ())
+  if (extended_remote_supports_disable_randomization (ops))
     extended_remote_disable_randomization (disable_randomization);
 
   /* Now restart the remote server.  */
@@ -8108,14 +7974,6 @@ extended_remote_create_inferior_1 (char *exec_file, char *args,
   /* Get updated offsets, if the stub uses qOffsets.  */
   get_offsets ();
 }
-
-static void
-extended_remote_create_inferior (struct target_ops *ops, 
-				 char *exec_file, char *args,
-				 char **env, int from_tty)
-{
-  extended_remote_create_inferior_1 (exec_file, args, env, from_tty);
-}
 
 
 /* Given a location's target info BP_TGT and the packet buffer BUF,  output
@@ -8151,8 +8009,6 @@ remote_add_target_side_condition (struct gdbarch *gdbarch,
 	buf = pack_hex_byte (buf, aexpr->buf[i]);
       *buf = '\0';
     }
-
-  VEC_free (agent_expr_p, bp_tgt->conditions);
   return 0;
 }
 
@@ -8183,8 +8039,6 @@ remote_add_target_side_commands (struct gdbarch *gdbarch,
 	buf = pack_hex_byte (buf, aexpr->buf[i]);
       *buf = '\0';
     }
-
-  VEC_free (agent_expr_p, bp_tgt->tcommands);
 }
 
 /* Insert a breakpoint.  On targets that have software breakpoint
@@ -8192,7 +8046,8 @@ remote_add_target_side_commands (struct gdbarch *gdbarch,
    which don't, we insert a traditional memory breakpoint.  */
 
 static int
-remote_insert_breakpoint (struct gdbarch *gdbarch,
+remote_insert_breakpoint (struct target_ops *ops,
+			  struct gdbarch *gdbarch,
 			  struct bp_target_info *bp_tgt)
 {
   /* Try the "Z" s/w breakpoint packet if it is not already disabled.
@@ -8226,10 +8081,10 @@ remote_insert_breakpoint (struct gdbarch *gdbarch,
       p += hexnumstr (p, addr);
       xsnprintf (p, endbuf - p, ",%d", bpsize);
 
-      if (remote_supports_cond_breakpoints ())
+      if (remote_supports_cond_breakpoints (ops))
 	remote_add_target_side_condition (gdbarch, bp_tgt, p, endbuf);
 
-      if (remote_can_run_breakpoint_commands ())
+      if (remote_can_run_breakpoint_commands (ops))
 	remote_add_target_side_commands (gdbarch, bp_tgt, p);
 
       putpkt (rs->buf);
@@ -8248,11 +8103,18 @@ remote_insert_breakpoint (struct gdbarch *gdbarch,
 	}
     }
 
-  return memory_insert_breakpoint (gdbarch, bp_tgt);
+  /* If this breakpoint has target-side commands but this stub doesn't
+     support Z0 packets, throw error.  */
+  if (!VEC_empty (agent_expr_p, bp_tgt->tcommands))
+    throw_error (NOT_SUPPORTED_ERROR, _("\
+Target doesn't support breakpoints that have target side commands."));
+
+  return memory_insert_breakpoint (ops, gdbarch, bp_tgt);
 }
 
 static int
-remote_remove_breakpoint (struct gdbarch *gdbarch,
+remote_remove_breakpoint (struct target_ops *ops,
+			  struct gdbarch *gdbarch,
 			  struct bp_target_info *bp_tgt)
 {
   CORE_ADDR addr = bp_tgt->placed_address;
@@ -8282,7 +8144,7 @@ remote_remove_breakpoint (struct gdbarch *gdbarch,
       return (rs->buf[0] == 'E');
     }
 
-  return memory_remove_breakpoint (gdbarch, bp_tgt);
+  return memory_remove_breakpoint (ops, gdbarch, bp_tgt);
 }
 
 static int
@@ -8306,7 +8168,8 @@ watchpoint_to_Z_packet (int type)
 }
 
 static int
-remote_insert_watchpoint (CORE_ADDR addr, int len, int type,
+remote_insert_watchpoint (struct target_ops *self,
+			  CORE_ADDR addr, int len, int type,
 			  struct expression *cond)
 {
   struct remote_state *rs = get_remote_state ();
@@ -8355,7 +8218,8 @@ remote_watchpoint_addr_within_range (struct target_ops *target, CORE_ADDR addr,
 
 
 static int
-remote_remove_watchpoint (CORE_ADDR addr, int len, int type,
+remote_remove_watchpoint (struct target_ops *self,
+			  CORE_ADDR addr, int len, int type,
 			  struct expression *cond)
 {
   struct remote_state *rs = get_remote_state ();
@@ -8397,7 +8261,8 @@ int remote_hw_watchpoint_length_limit = -1;
 int remote_hw_breakpoint_limit = -1;
 
 static int
-remote_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
+remote_region_ok_for_hw_watchpoint (struct target_ops *self,
+				    CORE_ADDR addr, int len)
 {
   if (remote_hw_watchpoint_length_limit == 0)
     return 0;
@@ -8410,7 +8275,8 @@ remote_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
 }
 
 static int
-remote_check_watch_resources (int type, int cnt, int ot)
+remote_check_watch_resources (struct target_ops *self,
+			      int type, int cnt, int ot)
 {
   if (type == bp_hardware_breakpoint)
     {
@@ -8436,7 +8302,7 @@ remote_check_watch_resources (int type, int cnt, int ot)
 }
 
 static int
-remote_stopped_by_watchpoint (void)
+remote_stopped_by_watchpoint (struct target_ops *ops)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -8449,7 +8315,7 @@ remote_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
   struct remote_state *rs = get_remote_state ();
   int rc = 0;
 
-  if (remote_stopped_by_watchpoint ())
+  if (remote_stopped_by_watchpoint (target))
     {
       *addr_p = rs->remote_watch_data_address;
       rc = 1;
@@ -8460,7 +8326,7 @@ remote_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
 
 
 static int
-remote_insert_hw_breakpoint (struct gdbarch *gdbarch,
+remote_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
 			     struct bp_target_info *bp_tgt)
 {
   CORE_ADDR addr;
@@ -8494,10 +8360,10 @@ remote_insert_hw_breakpoint (struct gdbarch *gdbarch,
   p += hexnumstr (p, (ULONGEST) addr);
   xsnprintf (p, endbuf - p, ",%x", bp_tgt->placed_size);
 
-  if (remote_supports_cond_breakpoints ())
+  if (remote_supports_cond_breakpoints (self))
     remote_add_target_side_condition (gdbarch, bp_tgt, p, endbuf);
 
-  if (remote_can_run_breakpoint_commands ())
+  if (remote_can_run_breakpoint_commands (self))
     remote_add_target_side_commands (gdbarch, bp_tgt, p);
 
   putpkt (rs->buf);
@@ -8524,7 +8390,7 @@ remote_insert_hw_breakpoint (struct gdbarch *gdbarch,
 
 
 static int
-remote_remove_hw_breakpoint (struct gdbarch *gdbarch,
+remote_remove_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
 			     struct bp_target_info *bp_tgt)
 {
   CORE_ADDR addr;
@@ -8674,10 +8540,10 @@ the loaded file\n"));
    into remote target.  The number of bytes written to the remote
    target is returned, or -1 for error.  */
 
-static LONGEST
+static enum target_xfer_status
 remote_write_qxfer (struct target_ops *ops, const char *object_name,
                     const char *annex, const gdb_byte *writebuf, 
-                    ULONGEST offset, LONGEST len, 
+                    ULONGEST offset, LONGEST len, ULONGEST *xfered_len,
                     struct packet_config *packet)
 {
   int i, buf_len;
@@ -8686,7 +8552,7 @@ remote_write_qxfer (struct target_ops *ops, const char *object_name,
   int max_size = get_memory_write_packet_size (); 
 
   if (packet->support == PACKET_DISABLE)
-    return -1;
+    return TARGET_XFER_E_IO;
 
   /* Insert header.  */
   i = snprintf (rs->buf, max_size, 
@@ -8702,10 +8568,12 @@ remote_write_qxfer (struct target_ops *ops, const char *object_name,
   if (putpkt_binary (rs->buf, i + buf_len) < 0
       || getpkt_sane (&rs->buf, &rs->buf_size, 0) < 0
       || packet_ok (rs->buf, packet) != PACKET_OK)
-    return -1;
+    return TARGET_XFER_E_IO;
 
   unpack_varlen_hex (rs->buf, &n);
-  return n;
+
+  *xfered_len = n;
+  return TARGET_XFER_OK;
 }
 
 /* Read OBJECT_NAME/ANNEX from the remote target using a qXfer packet.
@@ -8715,17 +8583,18 @@ remote_write_qxfer (struct target_ops *ops, const char *object_name,
    EOF.  PACKET is checked and updated to indicate whether the remote
    target supports this object.  */
 
-static LONGEST
+static enum target_xfer_status
 remote_read_qxfer (struct target_ops *ops, const char *object_name,
 		   const char *annex,
 		   gdb_byte *readbuf, ULONGEST offset, LONGEST len,
+		   ULONGEST *xfered_len,
 		   struct packet_config *packet)
 {
   struct remote_state *rs = get_remote_state ();
   LONGEST i, n, packet_len;
 
   if (packet->support == PACKET_DISABLE)
-    return -1;
+    return TARGET_XFER_E_IO;
 
   /* Check whether we've cached an end-of-object packet that matches
      this request.  */
@@ -8734,7 +8603,8 @@ remote_read_qxfer (struct target_ops *ops, const char *object_name,
       if (strcmp (object_name, rs->finished_object) == 0
 	  && strcmp (annex ? annex : "", rs->finished_annex) == 0
 	  && offset == rs->finished_offset)
-	return 0;
+	return TARGET_XFER_EOF;
+
 
       /* Otherwise, we're now reading something different.  Discard
 	 the cache.  */
@@ -8755,12 +8625,12 @@ remote_read_qxfer (struct target_ops *ops, const char *object_name,
 	    phex_nz (n, sizeof n));
   i = putpkt (rs->buf);
   if (i < 0)
-    return -1;
+    return TARGET_XFER_E_IO;
 
   rs->buf[0] = '\0';
   packet_len = getpkt_sane (&rs->buf, &rs->buf_size, 0);
   if (packet_len < 0 || packet_ok (rs->buf, packet) != PACKET_OK)
-    return -1;
+    return TARGET_XFER_E_IO;
 
   if (rs->buf[0] != 'l' && rs->buf[0] != 'm')
     error (_("Unknown remote qXfer reply: %s"), rs->buf);
@@ -8785,13 +8655,20 @@ remote_read_qxfer (struct target_ops *ops, const char *object_name,
       rs->finished_offset = offset + i;
     }
 
-  return i;
+  if (i == 0)
+    return TARGET_XFER_EOF;
+  else
+    {
+      *xfered_len = i;
+      return TARGET_XFER_OK;
+    }
 }
 
-static LONGEST
+static enum target_xfer_status
 remote_xfer_partial (struct target_ops *ops, enum target_object object,
 		     const char *annex, gdb_byte *readbuf,
-		     const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+		     const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+		     ULONGEST *xfered_len)
 {
   struct remote_state *rs;
   int i;
@@ -8806,20 +8683,16 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
   /* Handle memory using the standard memory routines.  */
   if (object == TARGET_OBJECT_MEMORY)
     {
-      LONGEST xfered;
-
       /* If the remote target is connected but not running, we should
 	 pass this request down to a lower stratum (e.g. the executable
 	 file).  */
       if (!target_has_execution)
-	return 0;
+	return TARGET_XFER_EOF;
 
       if (writebuf != NULL)
-	xfered = remote_write_bytes (offset, writebuf, len);
+	return remote_write_bytes (offset, writebuf, len, xfered_len);
       else
-	xfered = remote_read_bytes (offset, readbuf, len);
-
-      return xfered;
+	return remote_read_bytes (offset, readbuf, len, xfered_len);
     }
 
   /* Handle SPU memory using qxfer packets.  */
@@ -8827,12 +8700,12 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
     {
       if (readbuf)
 	return remote_read_qxfer (ops, "spu", annex, readbuf, offset, len,
-				  &remote_protocol_packets
-				    [PACKET_qXfer_spu_read]);
+				  xfered_len, &remote_protocol_packets
+				  [PACKET_qXfer_spu_read]);
       else
 	return remote_write_qxfer (ops, "spu", annex, writebuf, offset, len,
-				   &remote_protocol_packets
-				     [PACKET_qXfer_spu_write]);
+				   xfered_len, &remote_protocol_packets
+				   [PACKET_qXfer_spu_write]);
     }
 
   /* Handle extra signal info using qxfer packets.  */
@@ -8840,11 +8713,11 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
     {
       if (readbuf)
 	return remote_read_qxfer (ops, "siginfo", annex, readbuf, offset, len,
-				  &remote_protocol_packets
+				  xfered_len, &remote_protocol_packets
 				  [PACKET_qXfer_siginfo_read]);
       else
 	return remote_write_qxfer (ops, "siginfo", annex,
-				   writebuf, offset, len,
+				   writebuf, offset, len, xfered_len,
 				   &remote_protocol_packets
 				   [PACKET_qXfer_siginfo_write]);
     }
@@ -8853,11 +8726,11 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
     {
       if (readbuf)
 	return remote_read_qxfer (ops, "statictrace", annex,
-				  readbuf, offset, len,
+				  readbuf, offset, len, xfered_len,
 				  &remote_protocol_packets
 				  [PACKET_qXfer_statictrace_read]);
       else
-	return -1;
+	return TARGET_XFER_E_IO;
     }
 
   /* Only handle flash writes.  */
@@ -8868,10 +8741,11 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
       switch (object)
 	{
 	case TARGET_OBJECT_FLASH:
-	  return remote_flash_write (ops, offset, len, writebuf);
+	  return remote_flash_write (ops, offset, len, xfered_len,
+				     writebuf);
 
 	default:
-	  return -1;
+	  return TARGET_XFER_E_IO;
 	}
     }
 
@@ -8886,60 +8760,66 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
     case TARGET_OBJECT_AUXV:
       gdb_assert (annex == NULL);
       return remote_read_qxfer (ops, "auxv", annex, readbuf, offset, len,
+				xfered_len,
 				&remote_protocol_packets[PACKET_qXfer_auxv]);
 
     case TARGET_OBJECT_AVAILABLE_FEATURES:
       return remote_read_qxfer
-	(ops, "features", annex, readbuf, offset, len,
+	(ops, "features", annex, readbuf, offset, len, xfered_len,
 	 &remote_protocol_packets[PACKET_qXfer_features]);
 
     case TARGET_OBJECT_LIBRARIES:
       return remote_read_qxfer
-	(ops, "libraries", annex, readbuf, offset, len,
+	(ops, "libraries", annex, readbuf, offset, len, xfered_len,
 	 &remote_protocol_packets[PACKET_qXfer_libraries]);
 
     case TARGET_OBJECT_LIBRARIES_SVR4:
       return remote_read_qxfer
-	(ops, "libraries-svr4", annex, readbuf, offset, len,
+	(ops, "libraries-svr4", annex, readbuf, offset, len, xfered_len,
 	 &remote_protocol_packets[PACKET_qXfer_libraries_svr4]);
 
     case TARGET_OBJECT_MEMORY_MAP:
       gdb_assert (annex == NULL);
       return remote_read_qxfer (ops, "memory-map", annex, readbuf, offset, len,
+				 xfered_len,
 				&remote_protocol_packets[PACKET_qXfer_memory_map]);
 
     case TARGET_OBJECT_OSDATA:
       /* Should only get here if we're connected.  */
       gdb_assert (rs->remote_desc);
       return remote_read_qxfer
-       (ops, "osdata", annex, readbuf, offset, len,
+	(ops, "osdata", annex, readbuf, offset, len, xfered_len,
         &remote_protocol_packets[PACKET_qXfer_osdata]);
 
     case TARGET_OBJECT_THREADS:
       gdb_assert (annex == NULL);
       return remote_read_qxfer (ops, "threads", annex, readbuf, offset, len,
+				xfered_len,
 				&remote_protocol_packets[PACKET_qXfer_threads]);
 
     case TARGET_OBJECT_TRACEFRAME_INFO:
       gdb_assert (annex == NULL);
       return remote_read_qxfer
-	(ops, "traceframe-info", annex, readbuf, offset, len,
+	(ops, "traceframe-info", annex, readbuf, offset, len, xfered_len,
 	 &remote_protocol_packets[PACKET_qXfer_traceframe_info]);
 
     case TARGET_OBJECT_FDPIC:
       return remote_read_qxfer (ops, "fdpic", annex, readbuf, offset, len,
+				xfered_len,
 				&remote_protocol_packets[PACKET_qXfer_fdpic]);
 
     case TARGET_OBJECT_OPENVMS_UIB:
       return remote_read_qxfer (ops, "uib", annex, readbuf, offset, len,
+				xfered_len,
 				&remote_protocol_packets[PACKET_qXfer_uib]);
 
     case TARGET_OBJECT_BTRACE:
       return remote_read_qxfer (ops, "btrace", annex, readbuf, offset, len,
+				xfered_len,
         &remote_protocol_packets[PACKET_qXfer_btrace]);
 
     default:
-      return -1;
+      return TARGET_XFER_E_IO;
     }
 
   /* Note: a zero OFFSET and LEN can be used to query the minimum
@@ -8949,7 +8829,7 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
   /* Minimum outbuf size is get_remote_packet_size ().  If LEN is not
      large enough let the caller deal with it.  */
   if (len < get_remote_packet_size ())
-    return -1;
+    return TARGET_XFER_E_IO;
   len = get_remote_packet_size ();
 
   /* Except for querying the minimum buffer size, target must be open.  */
@@ -8981,12 +8861,13 @@ remote_xfer_partial (struct target_ops *ops, enum target_object object,
 
   i = putpkt (rs->buf);
   if (i < 0)
-    return i;
+    return TARGET_XFER_E_IO;
 
   getpkt (&rs->buf, &rs->buf_size, 0);
   strcpy ((char *) readbuf, rs->buf);
 
-  return strlen ((char *) readbuf);
+  *xfered_len = strlen ((char *) readbuf);
+  return TARGET_XFER_OK;
 }
 
 static int
@@ -9081,7 +8962,7 @@ remote_search_memory (struct target_ops* ops,
 }
 
 static void
-remote_rcmd (char *command,
+remote_rcmd (struct target_ops *self, char *command,
 	     struct ui_file *outbuf)
 {
   struct remote_state *rs = get_remote_state ();
@@ -9103,7 +8984,7 @@ remote_rcmd (char *command,
     error (_("\"monitor\" command ``%s'' is too long."), command);
 
   /* Encode the actual command.  */
-  bin2hex ((gdb_byte *) command, p, 0);
+  bin2hex ((gdb_byte *) command, p, strlen (command));
 
   if (putpkt (rs->buf) < 0)
     error (_("Communication problem with target."));
@@ -9774,7 +9655,8 @@ remote_hostio_send_command (int command_bytes, int which_packet,
    *REMOTE_ERRNO).  */
 
 static int
-remote_hostio_open (const char *filename, int flags, int mode,
+remote_hostio_open (struct target_ops *self,
+		    const char *filename, int flags, int mode,
 		    int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
@@ -9801,7 +9683,8 @@ remote_hostio_open (const char *filename, int flags, int mode,
    set *REMOTE_ERRNO).  */
 
 static int
-remote_hostio_pwrite (int fd, const gdb_byte *write_buf, int len,
+remote_hostio_pwrite (struct target_ops *self,
+		      int fd, const gdb_byte *write_buf, int len,
 		      ULONGEST offset, int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
@@ -9829,7 +9712,8 @@ remote_hostio_pwrite (int fd, const gdb_byte *write_buf, int len,
    set *REMOTE_ERRNO).  */
 
 static int
-remote_hostio_pread (int fd, gdb_byte *read_buf, int len,
+remote_hostio_pread (struct target_ops *self,
+		     int fd, gdb_byte *read_buf, int len,
 		     ULONGEST offset, int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
@@ -9868,7 +9752,7 @@ remote_hostio_pread (int fd, gdb_byte *read_buf, int len,
    (and set *REMOTE_ERRNO).  */
 
 static int
-remote_hostio_close (int fd, int *remote_errno)
+remote_hostio_close (struct target_ops *self, int fd, int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
   char *p = rs->buf;
@@ -9886,7 +9770,8 @@ remote_hostio_close (int fd, int *remote_errno)
    occurs (and set *REMOTE_ERRNO).  */
 
 static int
-remote_hostio_unlink (const char *filename, int *remote_errno)
+remote_hostio_unlink (struct target_ops *self,
+		      const char *filename, int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
   char *p = rs->buf;
@@ -9906,7 +9791,8 @@ remote_hostio_unlink (const char *filename, int *remote_errno)
    occurs (and set *REMOTE_ERRNO).  */
 
 static char *
-remote_hostio_readlink (const char *filename, int *remote_errno)
+remote_hostio_readlink (struct target_ops *self,
+			const char *filename, int *remote_errno)
 {
   struct remote_state *rs = get_remote_state ();
   char *p = rs->buf;
@@ -10007,7 +9893,7 @@ remote_hostio_close_cleanup (void *opaque)
   int fd = *(int *) opaque;
   int remote_errno;
 
-  remote_hostio_close (fd, &remote_errno);
+  remote_hostio_close (find_target_at (process_stratum), fd, &remote_errno);
 }
 
 
@@ -10020,7 +9906,8 @@ remote_bfd_iovec_open (struct bfd *abfd, void *open_closure)
 
   gdb_assert (remote_filename_p (filename));
 
-  fd = remote_hostio_open (filename + 7, FILEIO_O_RDONLY, 0, &remote_errno);
+  fd = remote_hostio_open (find_target_at (process_stratum),
+			   filename + 7, FILEIO_O_RDONLY, 0, &remote_errno);
   if (fd == -1)
     {
       errno = remote_fileio_errno_to_host (remote_errno);
@@ -10043,7 +9930,7 @@ remote_bfd_iovec_close (struct bfd *abfd, void *stream)
 
   /* Ignore errors on close; these may happen if the remote
      connection was already torn down.  */
-  remote_hostio_close (fd, &remote_errno);
+  remote_hostio_close (find_target_at (process_stratum), fd, &remote_errno);
 
   /* Zero means success.  */
   return 0;
@@ -10060,7 +9947,8 @@ remote_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
   pos = 0;
   while (nbytes > pos)
     {
-      bytes = remote_hostio_pread (fd, (gdb_byte *) buf + pos, nbytes - pos,
+      bytes = remote_hostio_pread (find_target_at (process_stratum),
+				   fd, (gdb_byte *) buf + pos, nbytes - pos,
 				   offset + pos, &remote_errno);
       if (bytes == 0)
         /* Success, but no bytes, means end-of-file.  */
@@ -10126,7 +10014,8 @@ remote_file_put (const char *local_file, const char *remote_file, int from_tty)
     perror_with_name (local_file);
   back_to = make_cleanup_fclose (file);
 
-  fd = remote_hostio_open (remote_file, (FILEIO_O_WRONLY | FILEIO_O_CREAT
+  fd = remote_hostio_open (find_target_at (process_stratum),
+			   remote_file, (FILEIO_O_WRONLY | FILEIO_O_CREAT
 					 | FILEIO_O_TRUNC),
 			   0700, &remote_errno);
   if (fd == -1)
@@ -10170,7 +10059,8 @@ remote_file_put (const char *local_file, const char *remote_file, int from_tty)
       bytes += bytes_in_buffer;
       bytes_in_buffer = 0;
 
-      retcode = remote_hostio_pwrite (fd, buffer, bytes,
+      retcode = remote_hostio_pwrite (find_target_at (process_stratum),
+				      fd, buffer, bytes,
 				      offset, &remote_errno);
 
       if (retcode < 0)
@@ -10189,7 +10079,7 @@ remote_file_put (const char *local_file, const char *remote_file, int from_tty)
     }
 
   discard_cleanups (close_cleanup);
-  if (remote_hostio_close (fd, &remote_errno))
+  if (remote_hostio_close (find_target_at (process_stratum), fd, &remote_errno))
     remote_hostio_error (remote_errno);
 
   if (from_tty)
@@ -10210,7 +10100,8 @@ remote_file_get (const char *remote_file, const char *local_file, int from_tty)
   if (!rs->remote_desc)
     error (_("command can only be used with remote target"));
 
-  fd = remote_hostio_open (remote_file, FILEIO_O_RDONLY, 0, &remote_errno);
+  fd = remote_hostio_open (find_target_at (process_stratum),
+			   remote_file, FILEIO_O_RDONLY, 0, &remote_errno);
   if (fd == -1)
     remote_hostio_error (remote_errno);
 
@@ -10230,7 +10121,8 @@ remote_file_get (const char *remote_file, const char *local_file, int from_tty)
   offset = 0;
   while (1)
     {
-      bytes = remote_hostio_pread (fd, buffer, io_size, offset, &remote_errno);
+      bytes = remote_hostio_pread (find_target_at (process_stratum),
+				   fd, buffer, io_size, offset, &remote_errno);
       if (bytes == 0)
 	/* Success, but no bytes, means end-of-file.  */
 	break;
@@ -10245,7 +10137,7 @@ remote_file_get (const char *remote_file, const char *local_file, int from_tty)
     }
 
   discard_cleanups (close_cleanup);
-  if (remote_hostio_close (fd, &remote_errno))
+  if (remote_hostio_close (find_target_at (process_stratum), fd, &remote_errno))
     remote_hostio_error (remote_errno);
 
   if (from_tty)
@@ -10262,7 +10154,8 @@ remote_file_delete (const char *remote_file, int from_tty)
   if (!rs->remote_desc)
     error (_("command can only be used with remote target"));
 
-  retcode = remote_hostio_unlink (remote_file, &remote_errno);
+  retcode = remote_hostio_unlink (find_target_at (process_stratum),
+				  remote_file, &remote_errno);
   if (retcode == -1)
     remote_hostio_error (remote_errno);
 
@@ -10334,7 +10227,7 @@ remote_command (char *args, int from_tty)
 }
 
 static int
-remote_can_execute_reverse (void)
+remote_can_execute_reverse (struct target_ops *self)
 {
   if (remote_protocol_packets[PACKET_bs].support == PACKET_ENABLE
       || remote_protocol_packets[PACKET_bc].support == PACKET_ENABLE)
@@ -10344,20 +10237,20 @@ remote_can_execute_reverse (void)
 }
 
 static int
-remote_supports_non_stop (void)
+remote_supports_non_stop (struct target_ops *self)
 {
   return 1;
 }
 
 static int
-remote_supports_disable_randomization (void)
+remote_supports_disable_randomization (struct target_ops *self)
 {
   /* Only supported in extended mode.  */
   return 0;
 }
 
 static int
-remote_supports_multi_process (void)
+remote_supports_multi_process (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -10377,7 +10270,7 @@ remote_supports_cond_tracepoints (void)
 }
 
 static int
-remote_supports_cond_breakpoints (void)
+remote_supports_cond_breakpoints (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -10409,7 +10302,7 @@ remote_supports_install_in_trace (void)
 }
 
 static int
-remote_supports_enable_disable_tracepoint (void)
+remote_supports_enable_disable_tracepoint (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -10417,7 +10310,7 @@ remote_supports_enable_disable_tracepoint (void)
 }
 
 static int
-remote_supports_string_tracing (void)
+remote_supports_string_tracing (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -10425,7 +10318,7 @@ remote_supports_string_tracing (void)
 }
 
 static int
-remote_can_run_breakpoint_commands (void)
+remote_can_run_breakpoint_commands (struct target_ops *self)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -10720,7 +10613,7 @@ remote_download_trace_state_variable (struct trace_state_variable *tsv)
   p = rs->buf + strlen (rs->buf);
   if ((p - rs->buf) + strlen (tsv->name) * 2 >= get_remote_packet_size ())
     error (_("Trace state variable name too long for tsv definition packet"));
-  p += 2 * bin2hex ((gdb_byte *) (tsv->name), p, 0);
+  p += 2 * bin2hex ((gdb_byte *) (tsv->name), p, strlen (tsv->name));
   *p++ = '\0';
   putpkt (rs->buf);
   remote_get_noisy_reply (&target_buf, &target_buf_size);
@@ -11050,7 +10943,7 @@ remote_save_trace_data (const char *filename)
   p += strlen (p);
   if ((p - rs->buf) + strlen (filename) * 2 >= get_remote_packet_size ())
     error (_("Remote file name too long for trace save packet"));
-  p += 2 * bin2hex ((gdb_byte *) filename, p, 0);
+  p += 2 * bin2hex ((gdb_byte *) filename, p, strlen (filename));
   *p++ = '\0';
   putpkt (rs->buf);
   reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
@@ -11255,21 +11148,21 @@ remote_set_trace_notes (const char *user, const char *notes,
   if (user)
     {
       buf += xsnprintf (buf, endbuf - buf, "user:");
-      nbytes = bin2hex ((gdb_byte *) user, buf, 0);
+      nbytes = bin2hex ((gdb_byte *) user, buf, strlen (user));
       buf += 2 * nbytes;
       *buf++ = ';';
     }
   if (notes)
     {
       buf += xsnprintf (buf, endbuf - buf, "notes:");
-      nbytes = bin2hex ((gdb_byte *) notes, buf, 0);
+      nbytes = bin2hex ((gdb_byte *) notes, buf, strlen (notes));
       buf += 2 * nbytes;
       *buf++ = ';';
     }
   if (stop_notes)
     {
       buf += xsnprintf (buf, endbuf - buf, "tstop:");
-      nbytes = bin2hex ((gdb_byte *) stop_notes, buf, 0);
+      nbytes = bin2hex ((gdb_byte *) stop_notes, buf, strlen (stop_notes));
       buf += 2 * nbytes;
       *buf++ = ';';
     }
@@ -11324,7 +11217,7 @@ struct btrace_target_info
 /* Check whether the target supports branch tracing.  */
 
 static int
-remote_supports_btrace (void)
+remote_supports_btrace (struct target_ops *self)
 {
   if (remote_protocol_packets[PACKET_Qbtrace_off].support != PACKET_ENABLE)
     return 0;
@@ -11415,13 +11308,14 @@ remote_teardown_btrace (struct btrace_target_info *tinfo)
 
 /* Read the branch trace.  */
 
-static VEC (btrace_block_s) *
-remote_read_btrace (struct btrace_target_info *tinfo,
+static enum btrace_error
+remote_read_btrace (VEC (btrace_block_s) **btrace,
+		    struct btrace_target_info *tinfo,
 		    enum btrace_read_type type)
 {
   struct packet_config *packet = &remote_protocol_packets[PACKET_qXfer_btrace];
   struct remote_state *rs = get_remote_state ();
-  VEC (btrace_block_s) *btrace = NULL;
+  struct cleanup *cleanup;
   const char *annex;
   char *xml;
 
@@ -11434,12 +11328,15 @@ remote_read_btrace (struct btrace_target_info *tinfo,
 
   switch (type)
     {
-    case btrace_read_all:
+    case BTRACE_READ_ALL:
       annex = "all";
       break;
-    case btrace_read_new:
+    case BTRACE_READ_NEW:
       annex = "new";
       break;
+    case BTRACE_READ_DELTA:
+      annex = "delta";
+      break;
     default:
       internal_error (__FILE__, __LINE__,
 		      _("Bad branch tracing read type: %u."),
@@ -11448,15 +11345,14 @@ remote_read_btrace (struct btrace_target_info *tinfo,
 
   xml = target_read_stralloc (&current_target,
                               TARGET_OBJECT_BTRACE, annex);
-  if (xml != NULL)
-    {
-      struct cleanup *cleanup = make_cleanup (xfree, xml);
+  if (xml == NULL)
+    return BTRACE_ERR_UNKNOWN;
 
-      btrace = parse_xml_btrace (xml);
-      do_cleanups (cleanup);
-    }
+  cleanup = make_cleanup (xfree, xml);
+  *btrace = parse_xml_btrace (xml);
+  do_cleanups (cleanup);
 
-  return btrace;
+  return BTRACE_ERR_NONE;
 }
 
 static int
@@ -11467,6 +11363,14 @@ remote_augmented_libraries_svr4_read (void)
   return rs->augmented_libraries_svr4_read;
 }
 
+/* Implementation of to_load.  */
+
+static void
+remote_load (struct target_ops *self, char *name, int from_tty)
+{
+  generic_load (name, from_tty);
+}
+
 static void
 init_remote_ops (void)
 {
@@ -11500,7 +11404,7 @@ Specify the serial device it is connected to\n\
   remote_ops.to_insert_watchpoint = remote_insert_watchpoint;
   remote_ops.to_remove_watchpoint = remote_remove_watchpoint;
   remote_ops.to_kill = remote_kill;
-  remote_ops.to_load = generic_load;
+  remote_ops.to_load = remote_load;
   remote_ops.to_mourn_inferior = remote_mourn;
   remote_ops.to_pass_signals = remote_pass_signals;
   remote_ops.to_program_signals = remote_program_signals;
@@ -11617,7 +11521,7 @@ Specify the serial device it is connected to (e.g. /dev/ttya).";
 }
 
 static int
-remote_can_async_p (void)
+remote_can_async_p (struct target_ops *ops)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -11630,7 +11534,7 @@ remote_can_async_p (void)
 }
 
 static int
-remote_is_async_p (void)
+remote_is_async_p (struct target_ops *ops)
 {
   struct remote_state *rs = get_remote_state ();
 
@@ -11665,8 +11569,10 @@ remote_async_inferior_event_handler (gdb_client_data data)
 }
 
 static void
-remote_async (void (*callback) (enum inferior_event_type event_type,
-				void *context), void *context)
+remote_async (struct target_ops *ops,
+	      void (*callback) (enum inferior_event_type event_type,
+				void *context),
+	      void *context)
 {
   struct remote_state *rs = get_remote_state ();