Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 1444 insertions, 0 deletions

diff --git a/gdb/ocd.c b/gdb/ocd.c
new file mode 100644
index 0000000..343fa62
--- /dev/null
+++ b/gdb/ocd.c
@@ -0,0 +1,1444 @@
+/* Target communications support for Macraigor Systems' On-Chip Debugging
+   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 ocd_read_bytes PARAMS ((CORE_ADDR memaddr,
+				      char *myaddr, int len));
+
+static int ocd_start_remote PARAMS ((PTR 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 ocd_interrupt PARAMS ((int signo));
+
+static void ocd_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
+
+static unsigned char * ocd_do_command PARAMS ((int cmd, int *statusp, int *lenp));
+
+static void ocd_put_packet PARAMS ((unsigned char *packet, int pktlen));
+
+static unsigned char * ocd_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.  */
+
+#if 0
+/* FIXME: Change to allow option to set timeout value on a per target
+   basis. */
+static int remote_timeout = 2;
+#endif
+
+/* Descriptor for I/O to remote machine.  Initialize it to NULL so that
+   ocd_open knows that we don't have a file open when the program
+   starts.  */
+static serial_t ocd_desc = NULL;
+
+void
+ocd_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 OCD mode"; break;
+    case 0x5: s = "Target stuck in reset"; break;
+    case 0x6: s = "OCD hasn't been initialized"; break;
+    case 0x7: s = "Write verify failed"; break;
+    case 0x8: s = "Reg buff error (during MPC5xx fp reg read/write)"; break;
+    case 0x9: s = "Invalid CPU register access attempt 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 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
+ocd_thread_alive (th)
+     int th;
+{
+  return 1;
+}
+
+/* Clean up connection to a remote debugger.  */
+
+/* ARGSUSED */
+void
+ocd_close (quitting)
+     int quitting;
+{
+  if (ocd_desc)
+    SERIAL_CLOSE (ocd_desc);
+  ocd_desc = NULL;
+}
+
+/* Stub for catch_errors.  */
+
+static int
+ocd_start_remote (dummy)
+     PTR dummy;
+{
+  unsigned char buf[10], *p;
+  int pktlen;
+  int status;
+  int error_code;
+  int speed;
+  enum ocd_target_type target_type;
+
+  target_type = *(enum ocd_target_type*)dummy;
+
+  immediate_quit = 1;		/* Allow user to interrupt it */
+
+  SERIAL_SEND_BREAK (ocd_desc); /* Wake up the wiggler */
+
+  speed = 80;			/* Divide clock by 4000 */
+
+  buf[0] = OCD_INIT;
+  buf[1] = speed >> 8;
+  buf[2] = speed & 0xff;
+  buf[3] = target_type;
+  ocd_put_packet (buf, 4);	/* Init OCD params */
+  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+
+  if (pktlen < 2)
+    error ("Truncated response packet from OCD device");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    ocd_error ("OCD_INIT:", error_code);
+
+  ocd_do_command (OCD_AYT, &status, &pktlen);
+
+  p = ocd_do_command (OCD_GET_VERSION, &status, &pktlen);
+
+  printf_unfiltered ("[Wiggler version %x.%x, capability 0x%x]\n",
+		     p[0], p[1], (p[2] << 16) | p[3]);
+
+#if 0
+  /* Reset the target */
+
+  ocd_do_command (OCD_RESET_RUN, &status, &pktlen);
+/*  ocd_do_command (OCD_RESET, &status, &pktlen);*/
+#endif
+
+  /* If processor is still running, stop it.  */
+
+  if (!(status & OCD_FLAG_BDM))
+    ocd_stop ();
+
+#if 1
+  /* When using a target box, we want to asynchronously return status when
+     target stops.  The OCD_SET_CTL_FLAGS command is ignored by Wigglers.dll
+     when using a parallel Wiggler */
+  buf[0] = OCD_SET_CTL_FLAGS;
+  buf[1] = 0;
+  buf[2] = 1;
+  ocd_put_packet (buf, 3);
+
+  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+
+  if (pktlen < 2)
+    error ("Truncated response packet from OCD device");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    ocd_error ("OCD_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);
+
+  buf[0] = OCD_LOG_FILE;
+  buf[1] = 3;   /* close existing WIGGLERS.LOG */
+  ocd_put_packet (buf, 2);
+  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+
+  buf[0] = OCD_LOG_FILE;
+  buf[1] = 2;   /* append to existing WIGGLERS.LOG */
+  ocd_put_packet (buf, 2);
+  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+
+  return 1;
+}
+
+/* Open a connection to a remote debugger.
+   NAME is the filename used for communication.  */
+
+static DCACHE *ocd_dcache;
+
+void
+ocd_open (name, from_tty, target_type, ops)
+     char *name;
+     int from_tty;
+     enum ocd_target_type target_type;
+     struct target_ops *ops;
+{
+  unsigned char buf[10], *p;
+  int status;
+  int pktlen;
+
+  if (name == 0)
+    error ("To open an OCD connection, you need to specify the\n\
+device the OCD device is attached to (e.g. /dev/ttya).");
+
+  target_preopen (from_tty);
+
+  current_ops = ops;
+
+  unpush_target (current_ops);
+
+  ocd_dcache = dcache_init (ocd_read_bytes, ocd_write_bytes);
+
+  if (strncmp(name,"wiggler",7) == 0)
+      {
+	  ocd_desc = SERIAL_OPEN ("ocd");
+          if (!ocd_desc)
+            perror_with_name (name);
+
+	  buf[0] = OCD_LOG_FILE;
+	  buf[1] = 1;	/* open new or overwrite existing WIGGLERS.LOG */
+	  ocd_put_packet (buf, 2);
+	  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+
+	  buf[0] = OCD_SET_CONNECTION;
+	  buf[1] = 0x01;	/* atoi (name[11]); */
+	  ocd_put_packet (buf, 2);
+	  p = ocd_get_packet (buf[0], &pktlen, remote_timeout);
+      }
+  else	/* not using Wigglers.dll */
+      {
+          ocd_desc = SERIAL_OPEN (name);
+	  if (!ocd_desc)
+	      perror_with_name (name);
+      }
+
+  if (baud_rate != -1)
+    {
+      if (SERIAL_SETBAUDRATE (ocd_desc, baud_rate))
+	{
+	  SERIAL_CLOSE (ocd_desc);
+	  perror_with_name (name);
+	}
+    }
+
+  SERIAL_RAW (ocd_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 (ocd_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 (ocd_start_remote, &target_type,
+		     "Couldn't establish connection to remote target\n",
+		     RETURN_MASK_ALL))
+    {
+      pop_target();
+      error ("Failed to connect to OCD.");
+    }
+}
+
+/* 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
+ocd_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
+ocd_resume (pid, step, siggnal)
+     int pid, step;
+     enum target_signal siggnal;
+{
+  int pktlen;
+
+  dcache_flush (ocd_dcache);
+
+  if (step)
+    ocd_do_command (OCD_STEP, &last_run_status, &pktlen);
+  else
+    ocd_do_command (OCD_RUN, &last_run_status, &pktlen);
+}
+
+void
+ocd_stop ()
+{
+  int status;
+  int pktlen;
+
+  ocd_do_command (OCD_STOP, &status, &pktlen);
+
+  if (!(status & OCD_FLAG_BDM))
+    error ("Can't stop target via BDM");
+}
+
+static volatile int ocd_interrupt_flag;
+
+/* Send ^C to target to halt it.  Target will respond, and send us a
+   packet.  */
+
+static void
+ocd_interrupt (signo)
+     int signo;
+{
+  /* If this doesn't work, try more severe steps.  */
+  signal (signo, ocd_interrupt_twice);
+  
+  if (remote_debug)
+    printf_unfiltered ("ocd_interrupt called\n");
+
+  {
+    char buf[1];
+
+    ocd_stop ();
+    buf[0] = OCD_AYT;
+    ocd_put_packet (buf, 1);
+    ocd_interrupt_flag = 1;
+  }
+}
+
+static void (*ofunc)();
+
+/* The user typed ^C twice.  */
+static void
+ocd_interrupt_twice (signo)
+     int signo;
+{
+  signal (signo, ofunc);
+  
+  interrupt_query ();
+
+  signal (signo, ocd_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
+ocd_wait ()
+{
+  unsigned char *p;
+  int error_code;
+  int pktlen;
+  char buf[1];
+
+  ocd_interrupt_flag = 0;
+
+  /* Target might already be stopped by the time we get here. */
+  /* If we aren't already stopped, we need to loop until we've dropped
+     back into BDM mode */
+
+  while (!(last_run_status & OCD_FLAG_BDM))
+    {
+      buf[0] = OCD_AYT;
+      ocd_put_packet (buf, 1);
+      p = ocd_get_packet (OCD_AYT, &pktlen, -1);
+
+      ofunc = (void (*)()) signal (SIGINT, ocd_interrupt);
+      signal (SIGINT, ofunc);
+
+      if (pktlen < 2)
+	error ("Truncated response packet from OCD device");
+
+      last_run_status = p[1];
+      error_code = p[2];
+
+      if (error_code != 0)
+	ocd_error ("target_wait:", error_code);
+
+      if (last_run_status & OCD_FLAG_PWF)
+	error ("OCD device lost VCC at BDM interface.");
+      else if (last_run_status & OCD_FLAG_CABLE_DISC)
+	error ("OCD device cable appears to have been disconnected.");
+    }
+
+  if (ocd_interrupt_flag)
+    return 1;
+  else
+    return 0;
+}
+
+/* Read registers from the OCD device.  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 *
+ocd_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] = OCD_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;
+
+  ocd_put_packet (buf, 5);
+  p = ocd_get_packet (OCD_READ_REGS, &pktlen, remote_timeout);
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    ocd_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
+ocd_read_bdm_register (bdm_regno)
+     int bdm_regno;
+{
+  int reglen;
+  unsigned char *p;
+  CORE_ADDR regval;
+
+  p = ocd_read_bdm_registers (bdm_regno, bdm_regno, &reglen);
+  regval = extract_unsigned_integer (p, reglen);
+
+  return regval;
+}
+
+void
+ocd_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] = OCD_WRITE_REGS;
+  buf[1] = first_bdm_regno >> 8;
+  buf[2] = first_bdm_regno & 0xff;
+  buf[3] = reglen;
+  memcpy (buf + 4, regptr, reglen);
+
+  ocd_put_packet (buf, 4 + reglen);
+  p = ocd_get_packet (OCD_WRITE_REGS, &pktlen, remote_timeout);
+
+  if (pktlen < 3)
+    error ("Truncated response packet from OCD device");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    ocd_error ("ocd_write_bdm_registers:", error_code);
+}
+
+void
+ocd_write_bdm_register (bdm_regno, reg)
+     int bdm_regno;
+     CORE_ADDR reg;
+{
+  unsigned char buf[4];
+
+  store_unsigned_integer (buf, 4, reg);
+
+  ocd_write_bdm_registers (bdm_regno, buf, 4);
+}
+
+void 
+ocd_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 = OCD_WRITE_MEM;
+
+int
+ocd_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);
+      ocd_put_packet (buf, 8 + numbytes);
+      p = ocd_get_packet (OCD_WRITE_MEM, &pktlen, remote_timeout);
+      if (pktlen < 3)
+	error ("Truncated response packet from OCD device");
+
+      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)
+	ocd_error ("ocd_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
+ocd_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] = OCD_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;
+
+      ocd_put_packet (buf, 7);
+      p = ocd_get_packet (OCD_READ_MEM, &pktlen, remote_timeout);
+      if (pktlen < 4)
+	error ("Truncated response packet from OCD device");
+
+      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)
+	ocd_error ("ocd_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
+ocd_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 (ocd_dcache, memaddr, myaddr, len, should_write);
+}
+
+void
+ocd_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 (ocd_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 (ocd_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 OCD device.  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 OCD device.  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
+ocd_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 (ocd_desc, packet, packet_ptr - packet))
+    perror_with_name ("output_packet: write failed");
+}
+#endif
+
+#if 0
+/* Get a packet from the OCD device.  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 OCD device.  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 *
+ocd_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;
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("ocd_get_packet (readchar): %d", ch);
+
+  if (ch != 0x55)
+    error ("ocd_get_packet (readchar): %d", ch);
+
+/* 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 ("ocd_get_packet (readchar): %d", ch);
+
+  *packet_ptr++ = ch;
+  checksum += ch;
+
+/* Get status. */
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("ocd_get_packet (readchar): %d", ch);
+  *packet_ptr++ = ch;
+  checksum += ch;
+
+/* Get error code. */
+
+  ch = readchar (timeout);
+
+  if (ch < 0)
+    error ("ocd_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 OCD_AYT:	/* Are You There? */
+	case OCD_SET_BAUD_RATE: /* Set Baud Rate */
+	case OCD_INIT:	/* Initialize OCD device */
+	case OCD_SET_SPEED:	/* Set Speed */
+	case OCD_SET_FUNC_CODE: /* Set Function Code */
+	case OCD_SET_CTL_FLAGS: /* Set Control Flags */
+	case OCD_SET_BUF_ADDR: /* Set Register Buffer Address */
+	case OCD_RUN:	/* Run Target from PC  */
+	case OCD_RUN_ADDR:	/* Run Target from Specified Address  */
+	case OCD_STOP:	/* Stop Target */
+	case OCD_RESET_RUN:	/* Reset Target and Run */
+	case OCD_RESET:	/* Reset Target and Halt */
+	case OCD_STEP:	/* Single Step */
+	case OCD_WRITE_REGS: /* Write Register */
+	case OCD_WRITE_MEM:	/* Write Memory */
+	case OCD_FILL_MEM:	/* Fill Memory */
+	case OCD_MOVE_MEM:	/* Move Memory */
+	case OCD_WRITE_INT_MEM: /* Write Internal Memory */
+	case OCD_JUMP:	/* Jump to Subroutine */
+	case OCD_ERASE_FLASH: /* Erase flash memory */
+	case OCD_PROGRAM_FLASH: /* Write flash memory */
+	case OCD_EXIT_MON:	/* Exit the flash programming monitor  */
+	case OCD_ENTER_MON:	/* Enter the flash programming monitor  */
+	case OCD_LOG_FILE:	/* Make Wigglers.dll save Wigglers.log */
+	case OCD_SET_CONNECTION: /* Set type of connection in Wigglers.dll */
+	  len = 0;
+	  break;
+	case OCD_GET_VERSION: /* Get Version */
+	  len = 10;
+	  break;
+	case OCD_GET_STATUS_MASK: /* Get Status Mask */
+	  len = 1;
+	  break;
+	case OCD_GET_CTRS:	/* Get Error Counters */
+	case OCD_READ_REGS:	/* Read Register */
+	case OCD_READ_MEM:	/* Read Memory */
+	case OCD_READ_INT_MEM: /* Read Internal Memory */
+	  len = 257;
+	  break;
+	default:
+	  error ("ocd_get_packet: unknown packet type 0x%x\n", ch);
+	}
+    }
+
+  if (len == 257)		/* Byte stream? */
+    {				/* Yes, byte streams contain the length */
+      ch = readchar (timeout);
+
+      if (ch < 0)
+	error ("ocd_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 ("ocd_get_packet (readchar): %d", ch);
+      *packet_ptr++ = ch;
+      checksum += ch;
+    }
+
+  if (checksum != 0)
+    error ("ocd_get_packet: bad packet checksum");
+
+  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 *
+ocd_do_command (cmd, statusp, lenp)
+     int cmd;
+     int *statusp;
+     int *lenp;
+{
+  unsigned char buf[100], *p;
+  int status, error_code;
+  char errbuf[100];
+
+  unsigned char logbuf[100];
+  int logpktlen;
+
+  buf[0] = cmd;
+  ocd_put_packet (buf, 1);		/* Send command */
+  p = ocd_get_packet (*buf, lenp, remote_timeout);
+
+  if (*lenp < 3)
+    error ("Truncated response packet from OCD device");
+
+  status = p[1];
+  error_code = p[2];
+
+  if (error_code != 0)
+    {
+      sprintf (errbuf, "ocd_do_command (0x%x):", cmd);
+      ocd_error (errbuf, error_code);
+    }
+
+  if (status & OCD_FLAG_PWF)
+    error ("OCD device can't detect VCC at BDM interface.");
+  else if (status & OCD_FLAG_CABLE_DISC)
+    error ("BDM cable appears to be disconnected.");
+
+  *statusp = status;
+
+  logbuf[0] = OCD_LOG_FILE;
+  logbuf[1] = 3;   /* close existing WIGGLERS.LOG */
+  ocd_put_packet (logbuf, 2);
+  ocd_get_packet (logbuf[0], &logpktlen, remote_timeout);
+
+  logbuf[0] = OCD_LOG_FILE;
+  logbuf[1] = 2;   /* append to existing WIGGLERS.LOG */
+  ocd_put_packet (logbuf, 2);
+  ocd_get_packet (logbuf[0], &logpktlen, remote_timeout);
+
+  return p + 3;
+}
+
+void
+ocd_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
+ocd_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
+ocd_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
+ocd_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 ();
+}
+
+/* This should be defined for each target */
+/* But we want to be able to compile this file for some configurations
+   not yet supported fully */
+   
+#define BDM_BREAKPOINT {0x0,0x0,0x0,0x0} /* For ppc 8xx */
+#if 0
+#define BDM_BREAKPOINT {0x4a,0xfa} /* BGND insn used for CPU32 */
+#endif
+
+/* BDM (at least on CPU32) uses a different breakpoint */
+
+int
+ocd_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;
+}
+
+int
+ocd_remove_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  static char break_insn[] = BDM_BREAKPOINT;
+  int val;
+
+  val = target_write_memory (addr, contents_cache, 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 (!ocd_desc)
+    error ("Not connected to OCD device.");
+
+  ocd_do_command (OCD_RESET, &status, &pktlen);
+  dcache_flush (ocd_dcache);
+  registers_changed ();
+}
+
+static void
+bdm_restart_command (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  int status, pktlen;
+
+  if (!ocd_desc)
+    error ("Not connected to OCD device.");
+
+  ocd_do_command (OCD_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 (!ocd_desc)
+    error ("Not connected to OCD device.");
+
+  if (!args)
+    error ("Must specify file containing new OCD code.");
+
+/*  old_chain = make_cleanup (flash_cleanup, 0);*/
+
+  ocd_do_command (OCD_ENTER_MON, &status, &pktlen);
+
+  ocd_do_command (OCD_ERASE_FLASH, &status, &pktlen);
+
+  write_mem_command = OCD_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 = OCD_WRITE_MEM;
+
+  ocd_do_command (OCD_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 (!ocd_desc)
+    error ("Not connected to OCD device.");
+
+  if (!args)
+    error ("Must specify BDM register number.");
+
+}
+
+void
+_initialize_remote_ocd ()
+{
+  extern struct cmd_list_element *cmdlist;
+  static struct cmd_list_element *ocd_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 ("ocd", class_obscure, bdm_command, "", &ocd_cmd_list, "ocd ",
+		  0, &cmdlist);
+
+  add_cmd ("reset", class_obscure, bdm_reset_command, "", &ocd_cmd_list);
+  add_cmd ("restart", class_obscure, bdm_restart_command, "", &ocd_cmd_list);
+  add_cmd ("update-flash", class_obscure, bdm_update_flash_command, "", &ocd_cmd_list);
+  /*  add_cmd ("read-register", class_obscure, bdm_read_register_command, "", &ocd_cmd_list);*/
+}