Wed Aug 6 16:15:31 1997 Geoffrey Noer <noer@cygnus.com>

        * Makefile.in: add DLLTOOL = @DLLTOOL@, pass on DLLTOOL to
        sub makes, change clean rule to also remove *.a to remove
        libwigglers.a, in dependencies: add ppc-bdm.o ocd.o ser-ocd.o and
        remove remote-wiggler.o
        * configure.in: add DLLTOOL support
        * configure: regenerate
        * wigglers.def: new file for imports for wigglers.dll
        * ser-ocd.c: new file which is layer between ocd.c and either the
        wigglers.dll or the target box, only stub so far
        * config/powerpc/ppc-eabi.mt: add ppc-bdm.o to TDEPFILES
        * config/powerpc/ppc-sim.mt: add ppc-bdm.o to TDEPFILES
        * config/i386/cygwin32.mh: add ocd.o ser-ocd.o libwigglers.a
        to XDEPFILES, add rules to build libwigglers.a

        checking in changes of Stu Grossman  <grossman@cygnus.com>:
        * remote-wiggler.c: delete
        * ocd.c: new, was remote-wiggler.c
        always include sys/types.h, include ocd.h, move WIGGLER
        commands and many wiggler prototypes to ocd.h, make wiggler_desc
        static, stop making local wiggler functions static,
        define write_mem_command for wiggler_write_bytes
        (wiggler_start_remote): stop hardcoding the target type,
        instead set and use a target_type variable.
        (wiggler_open): add new target_type and ops args
        (wiggler_wait): now no longer takes pid and target_status as args,
        stop trying to set target_status struct, remove BGND insn
        checks
        (read_bdm_registers): renamed to wiggler_read_bdm_registers
        (wiggler_read_bdm_registers): numregs arg changed to reglen arg,
        remove pktlen check, set reglen instead of numregs
        (dump_all_bdm_regs): delete
        (wiggler_fetch_registers): delete
        (wiggler_prepare_to_store): now just an empty function
        (wiggler_store_registers): delete
        (wiggler_read_bdm_register): new
        (wiggler_write_bdm_registers): new
        (wiggler_write_bdm_register): new
        (wiggler_write_bytes): use write_mem_command variable instead of
        WIGGLER_WRITE_MEM
        (get_packet): renamed to wiggler_get_packet, change refs throughout
        (put_packet): renamed to wiggler_put_packet, change refs throughout
        (wiggler_get_packet): add break to default case of switch,
        change length of WIGGLER_GET_VERSION len to 10 from 4 to match
        specs
        (wiggler_mourn): unpush_target with current_ops, not &wiggler_ops
        (flash_xfer_memory): delete
        (noop_store_registers): new placeholder replacement for
        target_store_registers() which prevents generic_load from trying to
        set up the PC.
        (bdm_update_flash_command): add store_registers_tmp variable,
        make handling of wiggler_ops more generic -- define wiggler_ops
        in a target-specific file instead (such as ppc-bdm.c in the case
        of the ppc), use current_target to deal with registers again
        making this file less target-specific.
        (bdm_read_register_command): new
        (_initialize_remote_wiggler): stop doing add_target (&wiggler_ops),
        comment out add_cmd ("read-register", ...)
        * ocd.h: new, contains common wiggler prototypes, command definitions
        * ppc-bdm.c: file for ppc-specific OCD code, including target_ops
        structure for ppc bdm
        (bdm_ppc_open): new
        (bdm_ppc_wait): new
        (bdm_ppc_fetch_registers): new
        (bdm_ppc_store_registers_: new
        (_initialize_bdm_ppc): new
	* config/powerpc/tm-ppc-eabi.h: add necessary CPU32 BDM defines

1 files changed, 1371 insertions, 0 deletions

diff --git a/gdb/ocd.c b/gdb/ocd.c
new file mode 100644
index 00000000000..b20bd9c8e4e
--- /dev/null
+++ b/gdb/ocd.c
@@ -0,0 +1,1371 @@
+/* Remote target communications for the Macraigor Systems BDM Wiggler
+   Copyright 1996, 1997 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "gdb_string.h"
+#include <fcntl.h>
+#include "frame.h"
+#include "inferior.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "target.h"
+#include "wait.h"
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "dcache.h"
+#include <sys/types.h>
+#include <signal.h>
+#include "serial.h"
+#include "ocd.h"
+
+/* Prototypes for local functions */
+
+static int wiggler_write_bytes PARAMS ((CORE_ADDR memaddr,
+				       char *myaddr, int len));
+
+static int wiggler_read_bytes PARAMS ((CORE_ADDR memaddr,
+				      char *myaddr, int len));
+
+static int wiggler_start_remote PARAMS ((char *dummy));
+
+static int readchar PARAMS ((int timeout));
+
+static void reset_packet PARAMS ((void));
+
+static void output_packet PARAMS ((void));
+
+static int get_quoted_char PARAMS ((int timeout));
+
+static void put_quoted_char PARAMS ((int c));
+
+static void wiggler_interrupt PARAMS ((int signo));
+
+static void wiggler_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
+
+static unsigned char * do_command PARAMS ((int cmd, int *statusp, int *lenp));
+
+static void wiggler_put_packet PARAMS ((unsigned char *packet, int pktlen));
+
+static unsigned char * wiggler_get_packet PARAMS ((int cmd, int *pktlen, int timeout));
+
+static struct target_ops *current_ops = NULL;
+
+static int last_run_status;
+
+/* This was 5 seconds, which is a long time to sit and wait.
+   Unless this is going though some terminal server or multiplexer or
+   other form of hairy serial connection, I would think 2 seconds would
+   be plenty.  */
+
+/* Changed to allow option to set timeout value.
+   was static int remote_timeout = 2; */
+extern int remote_timeout;
+
+/* Descriptor for I/O to remote machine.  Initialize it to NULL so that
+   wiggler_open knows that we don't have a file open when the program
+   starts.  */
+static serial_t wiggler_desc = NULL;
+
+void
+wiggler_error (s, error_code)
+     char *s;
+     int error_code;
+{
+  char buf[100];
+
+  fputs_filtered (s, gdb_stderr);
+  fputs_filtered (" ", gdb_stderr);
+
+  switch (error_code)
+    {
+    case 0x1: s = "Unknown fault"; break;
+    case 0x2: s = "Power failed"; break;
+    case 0x3: s = "Cable disconnected"; break;
+    case 0x4: s = "Couldn't enter BDM"; break;
+    case 0x5: s = "Target stuck in reset"; break;
+    case 0x6: s = "Port not configured"; break;
+    case 0x7: s = "Write verify failed"; break;
+    case 0x11: s = "Bus error"; break;
+    case 0x12: s = "Checksum error"; break;
+    case 0x13: s = "Illegal command"; break;
+    case 0x14: s = "Parameter error"; break;
+    case 0x15: s = "Internal error"; break;
+    case 0x16: s = "Register buffer error"; break;
+    case 0x80: s = "Flash erase error"; break;
+    default:
+      sprintf (buf, "Unknown error code %d", error_code);
+      s = buf;
+    }
+
+  error (s);
+}
+
+/*  Return nonzero if the thread TH is still alive on the remote system.  */
+
+int
+wiggler_thread_alive (th)
+     int th;
+{
+  return 1;
+}
+
+/* Clean up connection to a remote debugger.  */
+
+/* ARGSUSED */
+void
+wiggler_close (quitting)
+     int quitting;
+{
+  if (wiggler_desc)
+    SERIAL_CLOSE (wiggler_desc);
+  wiggler_desc = NULL;
+}
+
+/* Stub for catch_errors.  */
+
+static int
+wiggler_start_remote (dummy)
+     char *dummy;
+{
+  unsigned char buf[10], *p;
+  int pktlen;
+  int status;
+  int error_code;
+  int speed;
+  enum wiggler_target_type target_type;
+
+  target_type = (enum wiggler_target_type)dummy;
+
+  immediate_quit = 1;		/* Allow user to interrupt it */
+
+  SERIAL_SEND_BREAK (wiggler_desc); /* Wake up the wiggler */
+
+  do_command (WIGGLER_AYT, &status, &pktlen);
+
+  p = do_command (WIGGLER_GET_VERSION, &status, &pktlen);
+
+  printf_unfiltered ("[Wiggler version %x.%x, capability 0x%x]\n",
+		     p[0], p[1], (p[2] << 16) | p[3]);
+
+#if 1
+  speed = 80;			/* Divide clock by 4000 */
+
+  buf[0] = WIGGLER_INIT;
+  buf[1] = speed >> 8;
+  buf[2] = speed & 0xff;
+  buf[3] = target_type;
+  wiggler_put_packet (buf, 4);	/* Init Wiggler params */
+  p = wiggler_get_packet (buf[0], &pktlen, remote_timeout);
+
+  if (pktlen < 2)
+    error ("Truncated response packet from Wiggler");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    wiggler_error ("WIGGLER_INIT:", error_code);
+#endif
+
+#if 0
+  /* Reset the target */
+
+  do_command (WIGGLER_RESET_RUN, &status, &pktlen);
+/*  do_command (WIGGLER_RESET, &status, &pktlen);*/
+#endif
+
+  /* If processor is still running, stop it.  */
+
+  if (!(status & WIGGLER_FLAG_BDM))
+    wiggler_stop ();
+
+#if 1
+  buf[0] = WIGGLER_SET_CTL_FLAGS;
+  buf[1] = 0;
+  buf[2] = 1;		/* Asynchronously return status when target stops */
+  wiggler_put_packet (buf, 3);
+
+  p = wiggler_get_packet (buf[0], &pktlen, remote_timeout);
+
+  if (pktlen < 2)
+    error ("Truncated response packet from Wiggler");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    wiggler_error ("WIGGLER_SET_CTL_FLAGS:", error_code);
+#endif
+
+  immediate_quit = 0;
+
+/* This is really the job of start_remote however, that makes an assumption
+   that the target is about to print out a status message of some sort.  That
+   doesn't happen here (in fact, it may not be possible to get the monitor to
+   send the appropriate packet).  */
+
+  flush_cached_frames ();
+  registers_changed ();
+  stop_pc = read_pc ();
+  set_current_frame (create_new_frame (read_fp (), stop_pc));
+  select_frame (get_current_frame (), 0);
+  print_stack_frame (selected_frame, -1, 1);
+
+  return 1;
+}
+
+/* Open a connection to a remote debugger.
+   NAME is the filename used for communication.  */
+
+static DCACHE *wiggler_dcache;
+
+void
+wiggler_open (name, from_tty, target_type, ops)
+     char *name;
+     int from_tty;
+     enum wiggler_target_type target_type;
+     struct target_ops *ops;
+{
+  if (name == 0)
+    error ("To open a Wiggler connection, you need to specify what serial\n\
+device the Wiggler is attached to (e.g. /dev/ttya).");
+
+  target_preopen (from_tty);
+
+  current_ops = ops;
+
+  unpush_target (current_ops);
+
+  wiggler_dcache = dcache_init (wiggler_read_bytes, wiggler_write_bytes);
+
+  wiggler_desc = SERIAL_OPEN (name);
+  if (!wiggler_desc)
+    perror_with_name (name);
+
+  if (baud_rate != -1)
+    {
+      if (SERIAL_SETBAUDRATE (wiggler_desc, baud_rate))
+	{
+	  SERIAL_CLOSE (wiggler_desc);
+	  perror_with_name (name);
+	}
+    }
+
+  SERIAL_RAW (wiggler_desc);
+
+  /* If there is something sitting in the buffer we might take it as a
+     response to a command, which would be bad.  */
+  SERIAL_FLUSH_INPUT (wiggler_desc);
+
+  if (from_tty)
+    {
+      puts_filtered ("Remote target wiggler connected to ");
+      puts_filtered (name);
+      puts_filtered ("\n");
+    }
+  push_target (current_ops);	/* Switch to using remote target now */
+
+  /* Without this, some commands which require an active target (such as kill)
+     won't work.  This variable serves (at least) double duty as both the pid
+     of the target process (if it has such), and as a flag indicating that a
+     target is active.  These functions should be split out into seperate
+     variables, especially since GDB will someday have a notion of debugging
+     several processes.  */
+
+  inferior_pid = 42000;
+  /* Start the remote connection; if error (0), discard this target.
+     In particular, if the user quits, be sure to discard it
+     (we'd be in an inconsistent state otherwise).  */
+  if (!catch_errors (wiggler_start_remote, (char *)target_type,
+		     "Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
+    pop_target();
+}
+
+/* This takes a program previously attached to and detaches it.  After
+   this is done, GDB can be used to debug some other program.  We
+   better not have left any breakpoints in the target program or it'll
+   die when it hits one.  */
+
+void
+wiggler_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (args)
+    error ("Argument given to \"detach\" when remotely debugging.");
+
+  pop_target ();
+  if (from_tty)
+    puts_filtered ("Ending remote debugging.\n");
+}
+
+/* Tell the remote machine to resume.  */
+
+void
+wiggler_resume (pid, step, siggnal)
+     int pid, step;
+     enum target_signal siggnal;
+{
+  int pktlen;
+
+  dcache_flush (wiggler_dcache);
+
+  if (step)
+    do_command (WIGGLER_STEP, &last_run_status, &pktlen);
+  else
+    do_command (WIGGLER_RUN, &last_run_status, &pktlen);
+}
+
+void
+wiggler_stop ()
+{
+  int status;
+  int pktlen;
+
+  do_command (WIGGLER_STOP, &status, &pktlen);
+
+  if (!(status & WIGGLER_FLAG_BDM))
+    error ("Can't stop target via BDM");
+}
+
+static volatile int wiggler_interrupt_flag;
+
+/* Send ^C to target to halt it.  Target will respond, and send us a
+   packet.  */
+
+static void
+wiggler_interrupt (signo)
+     int signo;
+{
+  /* If this doesn't work, try more severe steps.  */
+  signal (signo, wiggler_interrupt_twice);
+  
+  if (remote_debug)
+    printf_unfiltered ("wiggler_interrupt called\n");
+
+  {
+    char buf[1];
+
+    wiggler_stop ();
+    buf[0] = WIGGLER_AYT;
+    wiggler_put_packet (buf, 1);
+    wiggler_interrupt_flag = 1;
+  }
+}
+
+static void (*ofunc)();
+
+/* The user typed ^C twice.  */
+static void
+wiggler_interrupt_twice (signo)
+     int signo;
+{
+  signal (signo, ofunc);
+  
+  interrupt_query ();
+
+  signal (signo, wiggler_interrupt);
+}
+
+/* Ask the user what to do when an interrupt is received.  */
+
+static void
+interrupt_query ()
+{
+  target_terminal_ours ();
+
+  if (query ("Interrupted while waiting for the program.\n\
+Give up (and stop debugging it)? "))
+    {
+      target_mourn_inferior ();
+      return_to_top_level (RETURN_QUIT);
+    }
+
+  target_terminal_inferior ();
+}
+
+/* If nonzero, ignore the next kill.  */
+static int kill_kludge;
+
+/* Wait until the remote machine stops, then return,
+   storing status in STATUS just as `wait' would.
+   Returns "pid" (though it's not clear what, if anything, that
+   means in the case of this target).  */
+
+int
+wiggler_wait ()
+{
+  unsigned char *p;
+  int error_code, status;
+  int pktlen;
+
+  wiggler_interrupt_flag = 0;
+
+  /* Target may already be stopped by the time we get here. */
+
+  if (!(last_run_status & WIGGLER_FLAG_BDM))
+    {
+      ofunc = (void (*)()) signal (SIGINT, wiggler_interrupt);
+
+      p = wiggler_get_packet (WIGGLER_AYT, &pktlen, -1);
+
+      signal (SIGINT, ofunc);
+
+      if (pktlen < 2)
+	error ("Truncated response packet from Wiggler");
+
+      status = p[1];
+      error_code = p[2];
+
+      if (error_code != 0)
+	wiggler_error ("target_wait:", error_code);
+
+      if (status & WIGGLER_FLAG_PWF)
+	error ("Wiggler lost VCC at BDM interface.");
+      else if (status & WIGGLER_FLAG_CABLE_DISC)
+	error ("BDM cable appears to have been disconnected.");
+
+      if (!(status & WIGGLER_FLAG_BDM))
+	error ("Wiggler woke up, but wasn't stopped: 0x%x", status);
+    }
+
+  if (wiggler_interrupt_flag)
+    return 1;
+  else
+    return 0;
+}
+
+/* Read registers from the Wiggler.  Specify the starting and ending register
+   number.  Return the number of regs actually read in *NUMREGS.  Returns a
+   pointer to a static array containing the register contents.  */
+
+unsigned char *
+wiggler_read_bdm_registers (first_bdm_regno, last_bdm_regno, reglen)
+     int first_bdm_regno;
+     int last_bdm_regno;
+     int *reglen;
+{
+  unsigned char buf[10];
+  int i;
+  unsigned char *p;
+  unsigned char *regs;
+  int error_code, status;
+  int pktlen;
+
+  buf[0] = WIGGLER_READ_REGS;
+  buf[1] = first_bdm_regno >> 8;
+  buf[2] = first_bdm_regno & 0xff;
+  buf[3] = last_bdm_regno >> 8;
+  buf[4] = last_bdm_regno & 0xff;
+
+  wiggler_put_packet (buf, 5);
+  p = wiggler_get_packet (WIGGLER_READ_REGS, &pktlen, remote_timeout);
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    wiggler_error ("read_bdm_registers:", error_code);
+
+  i = p[3];
+  if (i == 0)
+    i = 256;
+
+  if (i > pktlen - 4
+      || ((i & 3) != 0))
+    error ("Register block size bad:  %d", i);
+
+  *reglen = i;
+
+  regs = p + 4;
+
+  return regs;
+}
+
+/* Read register BDM_REGNO and returns its value ala read_register() */
+
+CORE_ADDR
+wiggler_read_bdm_register (bdm_regno)
+     int bdm_regno;
+{
+  int reglen;
+  unsigned char *p;
+  CORE_ADDR regval;
+
+  p = wiggler_read_bdm_registers (bdm_regno, bdm_regno, &reglen);
+  regval = extract_unsigned_integer (p, reglen);
+
+  return regval;
+}
+
+void
+wiggler_write_bdm_registers (first_bdm_regno, regptr, reglen)
+     int first_bdm_regno;
+     unsigned char *regptr;
+     int reglen;
+{
+  unsigned char *buf;
+  unsigned char *p;
+  int error_code, status;
+  int pktlen;
+
+  buf = alloca (4 + reglen);
+
+  buf[0] = WIGGLER_WRITE_REGS;
+  buf[1] = first_bdm_regno >> 8;
+  buf[2] = first_bdm_regno & 0xff;
+  buf[3] = reglen;
+  memcpy (buf + 4, regptr, reglen);
+
+  wiggler_put_packet (buf, 4 + reglen);
+  p = wiggler_get_packet (WIGGLER_WRITE_REGS, &pktlen, remote_timeout);
+
+  if (pktlen < 3)
+    error ("Truncated response packet from Wiggler");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    wiggler_error ("wiggler_write_bdm_registers:", error_code);
+}
+
+void
+wiggler_write_bdm_register (bdm_regno, reg)
+     int bdm_regno;
+     CORE_ADDR reg;
+{
+  unsigned char buf[4];
+
+  store_unsigned_integer (buf, 4, reg);
+
+  wiggler_write_bdm_registers (bdm_regno, buf, 4);
+}
+
+void 
+wiggler_prepare_to_store ()
+{
+}
+
+/* Write memory data directly to the remote machine.
+   This does not inform the data cache; the data cache uses this.
+   MEMADDR is the address in the remote memory space.
+   MYADDR is the address of the buffer in our space.
+   LEN is the number of bytes.
+
+   Returns number of bytes transferred, or 0 for error.  */
+
+static int write_mem_command = WIGGLER_WRITE_MEM;
+
+static int
+wiggler_write_bytes (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  char buf[256 + 10];
+  unsigned char *p;
+  int origlen;
+
+  origlen = len;
+
+  buf[0] = write_mem_command;
+  buf[5] = 1;			/* Write as bytes */
+  buf[6] = 0;			/* Don't verify */
+
+  while (len > 0)
+    {
+      int numbytes;
+      int pktlen;
+      int status, error_code;
+
+      numbytes = min (len, 256 - 8);
+
+      buf[1] = memaddr >> 24;
+      buf[2] = memaddr >> 16;
+      buf[3] = memaddr >> 8;
+      buf[4] = memaddr;
+
+      buf[7] = numbytes;
+
+      memcpy (&buf[8], myaddr, numbytes);
+      wiggler_put_packet (buf, 8 + numbytes);
+      p = wiggler_get_packet (WIGGLER_WRITE_MEM, &pktlen, remote_timeout);
+      if (pktlen < 3)
+	error ("Truncated response packet from Wiggler");
+
+      status = p[1];
+      error_code = p[2];
+
+      if (error_code == 0x11)	/* Got a bus error? */
+	{
+	  CORE_ADDR error_address;
+
+	  error_address = p[3] << 24;
+	  error_address |= p[4] << 16;
+	  error_address |= p[5] << 8;
+	  error_address |= p[6];
+	  numbytes = error_address - memaddr;
+
+	  len -= numbytes;
+
+	  errno = EIO;
+
+	  break;
+	}
+      else if (error_code != 0)
+	wiggler_error ("wiggler_write_bytes:", error_code);
+
+      len -= numbytes;
+      memaddr += numbytes;
+      myaddr += numbytes;
+    }
+
+  return origlen - len;
+}
+
+/* Read memory data directly from the remote machine.
+   This does not use the data cache; the data cache uses this.
+   MEMADDR is the address in the remote memory space.
+   MYADDR is the address of the buffer in our space.
+   LEN is the number of bytes.
+
+   Returns number of bytes transferred, or 0 for error.  */
+
+static int
+wiggler_read_bytes (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  char buf[256 + 10];
+  unsigned char *p;
+  int origlen;
+
+  origlen = len;
+
+  buf[0] = WIGGLER_READ_MEM;
+  buf[5] = 1;			/* Read as bytes */
+
+  while (len > 0)
+    {
+      int numbytes;
+      int pktlen;
+      int status, error_code;
+
+      numbytes = min (len, 256 - 7);
+
+      buf[1] = memaddr >> 24;
+      buf[2] = memaddr >> 16;
+      buf[3] = memaddr >> 8;
+      buf[4] = memaddr;
+
+      buf[6] = numbytes;
+
+      wiggler_put_packet (buf, 7);
+      p = wiggler_get_packet (WIGGLER_READ_MEM, &pktlen, remote_timeout);
+      if (pktlen < 4)
+	error ("Truncated response packet from Wiggler");
+
+      status = p[1];
+      error_code = p[2];
+
+      if (error_code == 0x11)	/* Got a bus error? */
+	{
+	  CORE_ADDR error_address;
+
+	  error_address = p[3] << 24;
+	  error_address |= p[4] << 16;
+	  error_address |= p[5] << 8;
+	  error_address |= p[6];
+	  numbytes = error_address - memaddr;
+
+	  len -= numbytes;
+
+	  errno = EIO;
+
+	  break;
+	}
+      else if (error_code != 0)
+	wiggler_error ("wiggler_read_bytes:", error_code);
+
+      memcpy (myaddr, &p[4], numbytes);
+
+      len -= numbytes;
+      memaddr += numbytes;
+      myaddr += numbytes;
+    }
+
+  return origlen - len;
+}
+
+/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
+   to or from debugger address MYADDR.  Write to inferior if SHOULD_WRITE is
+   nonzero.  Returns length of data written or read; 0 for error.  */
+
+/* ARGSUSED */
+int
+wiggler_xfer_memory (memaddr, myaddr, len, should_write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int should_write;
+     struct target_ops *target;			/* ignored */
+{
+  return dcache_xfer_memory (wiggler_dcache, memaddr, myaddr, len, should_write);
+}
+
+void
+wiggler_files_info (ignore)
+     struct target_ops *ignore;
+{
+  puts_filtered ("Debugging a target over a serial line.\n");
+}
+
+/* Stuff for dealing with the packets which are part of this protocol.
+   See comment at top of file for details.  */
+
+/* Read a single character from the remote side, handling wierd errors. */
+
+static int
+readchar (timeout)
+     int timeout;
+{
+  int ch;
+
+  ch = SERIAL_READCHAR (wiggler_desc, timeout);
+
+  switch (ch)
+    {
+    case SERIAL_EOF:
+      error ("Remote connection closed");
+    case SERIAL_ERROR:
+      perror_with_name ("Remote communication error");
+    case SERIAL_TIMEOUT:
+    default:
+      return ch;
+    }
+}
+
+#if 0
+/* Read a character from the data stream, dequoting as necessary.  SYN is
+   treated special.  Any SYNs appearing in the data stream are returned as the
+   distinct value RAW_SYN (which has a value > 8 bits and therefore cannot be
+   mistaken for real data).  */
+
+static int
+get_quoted_char (timeout)
+     int timeout;
+{
+  int ch;
+
+  ch = readchar (timeout);
+
+  switch (ch)
+    {
+    case SERIAL_TIMEOUT:
+      error ("Timeout in mid-packet, aborting");
+    case SYN:
+      return RAW_SYN;
+    case DLE:
+      ch = readchar (timeout);
+      if (ch == SYN)
+	return RAW_SYN;
+      return ch & ~0100;
+    default:
+      return ch;
+    }
+}
+
+static unsigned char pkt[256 * 2 + 10], *pktp; /* Worst case */
+
+static void
+reset_packet ()
+{
+  pktp = pkt;
+}
+
+static void
+output_packet ()
+{
+  if (SERIAL_WRITE (wiggler_desc, pkt, pktp - pkt))
+    perror_with_name ("output_packet: write failed");
+
+  reset_packet ();
+}
+
+/* Output a quoted character.  SYNs and DLEs are quoted.  Everything else goes
+   through untouched.  */
+
+static void
+put_quoted_char (c)
+     int c;
+{
+  switch (c)
+    {
+    case SYN:
+    case DLE:
+      *pktp++ = DLE;
+      c |= 0100;
+    }
+
+  *pktp++ = c;
+}
+
+/* Send a packet to the Wiggler.  The packet framed by a SYN character, a byte
+   count and a checksum.  The byte count only counts the number of bytes
+   between the count and the checksum.  A count of zero actually means 256.
+   Any SYNs within the packet (including the checksum and count) must be
+   quoted.  The quote character must be quoted as well.  Quoting is done by
+   replacing the character with the two-character sequence DLE, {char} | 0100.
+   Note that the quoting mechanism has no effect on the byte count.
+ */
+
+static void
+stu_put_packet (buf, len)
+     unsigned char *buf;
+     int len;
+{
+  unsigned char checksum;
+  unsigned char c;
+
+  if (len == 0 || len > 256)
+    abort ();			/* Can't represent 0 length packet */
+
+  reset_packet ();
+
+  checksum = 0;
+
+  put_quoted_char (RAW_SYN);
+
+  c = len;
+
+  do
+    {
+      checksum += c;
+
+      put_quoted_char (c);
+
+      c = *buf++;
+    }
+  while (len-- > 0);
+
+  put_quoted_char (-checksum & 0xff);
+
+  output_packet ();
+}
+
+#else
+
+/* Send a packet to the Wiggler.  The packet framed by a SYN character, a byte
+   count and a checksum.  The byte count only counts the number of bytes
+   between the count and the checksum.  A count of zero actually means 256.
+   Any SYNs within the packet (including the checksum and count) must be
+   quoted.  The quote character must be quoted as well.  Quoting is done by
+   replacing the character with the two-character sequence DLE, {char} | 0100.
+   Note that the quoting mechanism has no effect on the byte count.
+ */
+
+static void
+wiggler_put_packet (buf, len)
+     unsigned char *buf;
+     int len;
+{
+  unsigned char checksum;
+  unsigned char c;
+  unsigned char *packet, *packet_ptr;
+
+  packet = alloca (len + 1 + 1); /* packet + SYN + checksum */
+  packet_ptr = packet;
+
+  checksum = 0;
+
+  *packet_ptr++ = 0x55;
+
+  while (len-- > 0)
+    {
+      c = *buf++;
+
+      checksum += c;
+      *packet_ptr++ = c;
+    }
+
+  *packet_ptr++ = -checksum;
+  if (SERIAL_WRITE (wiggler_desc, packet, packet_ptr - packet))
+    perror_with_name ("output_packet: write failed");
+}
+#endif
+
+#if 0
+/* Get a packet from the Wiggler.  Timeout is only enforced for the first byte
+   of the packet.  Subsequent bytes are expected to arrive in time <= 
+   remote_timeout.  Returns a pointer to a static buffer containing the payload
+   of the packet.  *LENP contains the length of the packet.
+*/
+
+static unsigned char *
+stu_get_packet (cmd, lenp, timeout)
+     unsigned char cmd;
+     int *lenp;
+{
+  int ch;
+  int len;
+  static unsigned char buf[256 + 10], *p;
+  unsigned char checksum;
+
+ find_packet:
+
+  ch = get_quoted_char (timeout);
+
+  if (ch < 0)
+    error ("get_packet (readchar): %d", ch);
+
+  if (ch != RAW_SYN)
+    goto find_packet;
+
+ found_syn:			/* Found the start of a packet */
+
+  p = buf;
+  checksum = 0;
+
+  len = get_quoted_char (remote_timeout);
+
+  if (len == RAW_SYN)
+    goto found_syn;
+
+  checksum += len;
+
+  if (len == 0)
+    len = 256;
+
+  len++;			/* Include checksum */
+
+  while (len-- > 0)
+    {
+      ch = get_quoted_char (remote_timeout);
+      if (ch == RAW_SYN)
+	goto found_syn;
+
+      *p++ = ch;
+      checksum += ch;
+    }
+
+  if (checksum != 0)
+    goto find_packet;
+
+  if (cmd != buf[0])
+    error ("Response phase error.  Got 0x%x, expected 0x%x", buf[0], cmd);
+
+  *lenp = p - buf - 1;
+  return buf;
+}
+
+#else
+
+/* Get a packet from the Wiggler.  Timeout is only enforced for the first byte
+   of the packet.  Subsequent bytes are expected to arrive in time <= 
+   remote_timeout.  Returns a pointer to a static buffer containing the payload
+   of the packet.  *LENP contains the length of the packet.
+*/
+
+static unsigned char *
+wiggler_get_packet (cmd, lenp, timeout)
+     int cmd;
+     int *lenp;
+{
+  int ch;
+  int len;
+  int i;
+  static unsigned char packet[512];
+  unsigned char *packet_ptr;
+  unsigned char checksum;
+
+ find_packet:
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("wiggler_get_packet (readchar): %d", ch);
+
+  if (ch != 0x55)
+    goto find_packet;
+
+/* Found the start of a packet */
+
+  packet_ptr = packet;
+  checksum = 0;
+
+/* Read command char.  That sort of tells us how long the packet is. */
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("wiggler_get_packet (readchar): %d", ch);
+
+  *packet_ptr++ = ch;
+  checksum += ch;
+
+/* Get status. */
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("wiggler_get_packet (readchar): %d", ch);
+  *packet_ptr++ = ch;
+  checksum += ch;
+
+/* Get error code. */
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("wiggler_get_packet (readchar): %d", ch);
+  *packet_ptr++ = ch;
+  checksum += ch;
+
+  switch (ch)			/* Figure out length of packet */
+    {
+    case 0x7:			/* Write verify error? */
+      len = 8;			/* write address, value read back */
+      break;
+    case 0x11:			/* Bus error? */
+				/* write address, read flag */
+    case 0x15:			/* Internal error */
+      len = 5;			/* error code, vector */
+      break;
+    default:			/* Error w/no params */
+      len = 0;
+      break;
+    case 0x0:			/* Normal result */
+      switch (packet[0])
+	{
+	case WIGGLER_AYT:	/* Are You There? */
+	case WIGGLER_SET_BAUD_RATE: /* Set Baud Rate */
+	case WIGGLER_INIT:	/* Initialize wiggler */
+	case WIGGLER_SET_SPEED:	/* Set Speed */
+	case WIGGLER_SET_FUNC_CODE: /* Set Function Code */
+	case WIGGLER_SET_CTL_FLAGS: /* Set Control Flags */
+	case WIGGLER_SET_BUF_ADDR: /* Set Register Buffer Address */
+	case WIGGLER_RUN:	/* Run Target from PC  */
+	case WIGGLER_RUN_ADDR:	/* Run Target from Specified Address  */
+	case WIGGLER_STOP:	/* Stop Target */
+	case WIGGLER_RESET_RUN:	/* Reset Target and Run */
+	case WIGGLER_RESET:	/* Reset Target and Halt */
+	case WIGGLER_STEP:	/* Single Step */
+	case WIGGLER_WRITE_REGS: /* Write Register */
+	case WIGGLER_WRITE_MEM:	/* Write Memory */
+	case WIGGLER_FILL_MEM:	/* Fill Memory */
+	case WIGGLER_MOVE_MEM:	/* Move Memory */
+	case WIGGLER_WRITE_INT_MEM: /* Write Internal Memory */
+	case WIGGLER_JUMP:	/* Jump to Subroutine */
+	case WIGGLER_ERASE_FLASH: /* Erase flash memory */
+	case WIGGLER_PROGRAM_FLASH: /* Write flash memory */
+	case WIGGLER_EXIT_MON:	/* Exit the flash programming monitor  */
+	case WIGGLER_ENTER_MON:	/* Enter the flash programming monitor  */
+	  len = 0;
+	  break;
+	case WIGGLER_GET_VERSION: /* Get Version */
+	  len = 10;
+	  break;
+	case WIGGLER_GET_STATUS_MASK: /* Get Status Mask */
+	  len = 1;
+	  break;
+	case WIGGLER_GET_CTRS:	/* Get Error Counters */
+	case WIGGLER_READ_REGS:	/* Read Register */
+	case WIGGLER_READ_MEM:	/* Read Memory */
+	case WIGGLER_READ_INT_MEM: /* Read Internal Memory */
+	  len = 257;
+	  break;
+	default:
+	  fprintf_filtered (gdb_stderr, "Unknown packet type 0x%x\n", ch);
+	  goto find_packet;
+	}
+    }
+
+  if (len == 257)		/* Byte stream? */
+    {				/* Yes, byte streams contain the length */
+      ch = readchar (timeout);
+
+      if (ch < 0)
+	error ("wiggler_get_packet (readchar): %d", ch);
+      *packet_ptr++ = ch;
+      checksum += ch;
+      len = ch;
+      if (len == 0)
+	len = 256;
+    }
+
+  while (len-- >= 0)		/* Do rest of packet and checksum */
+    {
+      ch = readchar (timeout);
+
+      if (ch < 0)
+	error ("wiggler_get_packet (readchar): %d", ch);
+      *packet_ptr++ = ch;
+      checksum += ch;
+    }
+
+  if (checksum != 0)
+    goto find_packet;
+
+  if (cmd != -1 && cmd != packet[0])
+    error ("Response phase error.  Got 0x%x, expected 0x%x", packet[0], cmd);
+
+  *lenp = packet_ptr - packet - 1; /* Subtract checksum byte */
+  return packet;
+}
+#endif
+
+/* Execute a simple (one-byte) command.  Returns a pointer to the data
+   following the error code.  */
+
+static unsigned char *
+do_command (cmd, statusp, lenp)
+     int cmd;
+     int *statusp;
+     int *lenp;
+{
+  unsigned char buf[100], *p;
+  int status, error_code;
+  char errbuf[100];
+
+  buf[0] = cmd;
+  wiggler_put_packet (buf, 1);		/* Send command */
+  p = wiggler_get_packet (*buf, lenp, remote_timeout);
+
+  if (*lenp < 3)
+    error ("Truncated response packet from Wiggler");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    {
+      sprintf (errbuf, "do_command (0x%x):", cmd);
+      wiggler_error (errbuf, error_code);
+    }
+
+  if (status & WIGGLER_FLAG_PWF)
+    error ("Wiggler can't detect VCC at BDM interface.");
+  else if (status & WIGGLER_FLAG_CABLE_DISC)
+    error ("BDM cable appears to be disconnected.");
+
+  *statusp = status;
+
+  return p + 3;
+}
+
+void
+wiggler_kill ()
+{
+  /* For some mysterious reason, wait_for_inferior calls kill instead of
+     mourn after it gets TARGET_WAITKIND_SIGNALLED.  Work around it.  */
+  if (kill_kludge)
+    {
+      kill_kludge = 0;
+      target_mourn_inferior ();
+      return;
+    }
+
+  /* Don't wait for it to die.  I'm not really sure it matters whether
+     we do or not.  */
+  target_mourn_inferior ();
+}
+
+void
+wiggler_mourn ()
+{
+  unpush_target (current_ops);
+  generic_mourn_inferior ();
+}
+
+/* All we actually do is set the PC to the start address of exec_bfd, and start
+   the program at that point.  */
+
+void
+wiggler_create_inferior (exec_file, args, env)
+     char *exec_file;
+     char *args;
+     char **env;
+{
+  if (args && (*args != '\000'))
+    error ("Args are not supported by BDM.");
+
+  clear_proceed_status ();
+  proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0);
+}
+
+void
+wiggler_load (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  generic_load (args, from_tty);
+
+  inferior_pid = 0;
+
+/* This is necessary because many things were based on the PC at the time that
+   we attached to the monitor, which is no longer valid now that we have loaded
+   new code (and just changed the PC).  Another way to do this might be to call
+   normal_stop, except that the stack may not be valid, and things would get
+   horribly confused... */
+
+  clear_symtab_users ();
+}
+
+/* BDM (at least on CPU32) uses a different breakpoint */
+
+static int
+wiggler_insert_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  static char break_insn[] = {BDM_BREAKPOINT};
+  int val;
+
+  val = target_read_memory (addr, contents_cache, sizeof break_insn);
+
+  if (val == 0)
+    val = target_write_memory (addr, break_insn, sizeof break_insn);
+
+  return val;
+}
+
+static void
+bdm_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  error ("bdm command must be followed by `reset'");
+}
+
+static void
+bdm_reset_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  int status, pktlen;
+
+  if (!wiggler_desc)
+    error ("Not connected to wiggler.");
+
+  do_command (WIGGLER_RESET, &status, &pktlen);
+  dcache_flush (wiggler_dcache);
+  registers_changed ();
+}
+
+static void
+bdm_restart_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  int status, pktlen;
+
+  if (!wiggler_desc)
+    error ("Not connected to wiggler.");
+
+  do_command (WIGGLER_RESET_RUN, &status, &pktlen);
+  last_run_status = status;
+  clear_proceed_status ();
+  wait_for_inferior ();
+  normal_stop ();
+}
+
+/* Temporary replacement for target_store_registers().  This prevents
+   generic_load from trying to set the PC.  */
+
+static void
+noop_store_registers (regno)
+     int regno;
+{
+}
+
+static void
+bdm_update_flash_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  int status, pktlen;
+  struct cleanup *old_chain;
+  void (*store_registers_tmp) PARAMS ((int));
+
+  if (!wiggler_desc)
+    error ("Not connected to wiggler.");
+
+  if (!args)
+    error ("Must specify file containing new Wiggler code.");
+
+/*  old_chain = make_cleanup (flash_cleanup, 0);*/
+
+  do_command (WIGGLER_ENTER_MON, &status, &pktlen);
+
+  do_command (WIGGLER_ERASE_FLASH, &status, &pktlen);
+
+  write_mem_command = WIGGLER_PROGRAM_FLASH;
+  store_registers_tmp = current_target.to_store_registers;
+  current_target.to_store_registers = noop_store_registers;
+
+  generic_load (args, from_tty);
+
+  current_target.to_store_registers = store_registers_tmp;
+  write_mem_command = WIGGLER_WRITE_MEM;
+
+  do_command (WIGGLER_EXIT_MON, &status, &pktlen);
+
+/*  discard_cleanups (old_chain);*/
+}
+
+static void
+bdm_read_register_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  /* XXX repeat should go on to the next register */
+
+  if (!wiggler_desc)
+    error ("Not connected to wiggler.");
+
+  if (!args)
+    error ("Must specify BDM register number.");
+
+}
+
+void
+_initialize_remote_wiggler ()
+{
+  extern struct cmd_list_element *cmdlist;
+  static struct cmd_list_element *bdm_cmd_list = NULL;
+
+  add_show_from_set (add_set_cmd ("remotetimeout", no_class,
+				  var_integer, (char *)&remote_timeout,
+				  "Set timeout value for remote read.\n", &setlist),
+		     &showlist);
+
+  add_prefix_cmd ("bdm", class_obscure, bdm_command, "", &bdm_cmd_list, "bdm ",
+		  0, &cmdlist);
+
+  add_cmd ("reset", class_obscure, bdm_reset_command, "", &bdm_cmd_list);
+  add_cmd ("restart", class_obscure, bdm_restart_command, "", &bdm_cmd_list);
+  add_cmd ("update-flash", class_obscure, bdm_update_flash_command, "", &bdm_cmd_list);
+  /*  add_cmd ("read-register", class_obscure, bdm_read_register_command, "", &bdm_cmd_list);*/
+}