Initial creation of sourceware repository

1 files changed, 0 insertions, 1206 deletions

diff --git a/gdb/remote-sds.c b/gdb/remote-sds.c
deleted file mode 100644
index 3ab5f44..0000000
--- a/gdb/remote-sds.c
+++ /dev/null
@@ -1,1206 +0,0 @@
-/* Remote target communications for serial-line targets using SDS' protocol.
-   Copyright 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.  */
-
-/* This interface was written by studying the behavior of the SDS
-   monitor on an ADS 821/860 board, and by consulting the
-   documentation of the monitor that is available on Motorola's web
-   site.  -sts 8/13/97 */
-
-#include "defs.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 "gdbthread.h"
-#include "gdbcore.h"
-#include "dcache.h"
-
-#ifdef USG
-#include <sys/types.h>
-#endif
-
-#include <signal.h>
-#include "serial.h"
-
-extern void _initialize_remote_sds PARAMS ((void));
-
-/* Declarations of local functions. */
-
-static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int));
-
-static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int));
-
-static void sds_files_info PARAMS ((struct target_ops *ignore));
-
-static int sds_xfer_memory PARAMS ((CORE_ADDR, char *,
-				    int, int, struct target_ops *));
-
-static void sds_prepare_to_store PARAMS ((void));
-
-static void sds_fetch_registers PARAMS ((int));
-
-static void sds_resume PARAMS ((int, int, enum target_signal));
-
-static int sds_start_remote PARAMS ((PTR));
-
-static void sds_open PARAMS ((char *, int));
-
-static void sds_close PARAMS ((int));
-
-static void sds_store_registers PARAMS ((int));
-
-static void sds_mourn PARAMS ((void));
-
-static void sds_create_inferior PARAMS ((char *, char *, char **));
-
-static void sds_load PARAMS ((char *, int));
-
-static int getmessage PARAMS ((unsigned char *, int));
-
-static int putmessage PARAMS ((unsigned char *, int));
-
-static int sds_send PARAMS ((unsigned char *, int));
-
-static int readchar PARAMS ((int));
-
-static int sds_wait PARAMS ((int, struct target_waitstatus *));
-
-static void sds_kill PARAMS ((void));
-
-static int tohex PARAMS ((int));
-
-static int fromhex PARAMS ((int));
-
-static void sds_detach PARAMS ((char *, int));
-
-static void sds_interrupt PARAMS ((int));
-
-static void sds_interrupt_twice PARAMS ((int));
-
-static void interrupt_query PARAMS ((void));
-
-static int read_frame PARAMS ((char *));
-
-static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *));
-
-static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *));
-
-static void init_sds_ops PARAMS ((void));
-
-static void sds_command PARAMS ((char *args, int from_tty));
-
-/* Define the target operations vector. */
-
-static struct target_ops sds_ops;
-
-/* 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.  */
-
-static int sds_timeout = 2;
-
-/* Descriptor for I/O to remote machine.  Initialize it to NULL so
-   that sds_open knows that we don't have a file open when the program
-   starts.  */
-
-static serial_t sds_desc = NULL;
-
-/* This limit comes from the monitor.  */
-
-#define	PBUFSIZ	250
-
-/* Maximum number of bytes to read/write at once.  The value here
-   is chosen to fill up a packet (the headers account for the 32).  */
-#define MAXBUFBYTES ((PBUFSIZ-32)/2)
-
-static int next_msg_id;
-
-static int just_started;
-
-static int message_pending;
-
-
-/* Clean up connection to a remote debugger.  */
-
-/* ARGSUSED */
-static void
-sds_close (quitting)
-     int quitting;
-{
-  if (sds_desc)
-    SERIAL_CLOSE (sds_desc);
-  sds_desc = NULL;
-}
-
-/* Stub for catch_errors.  */
-
-static int
-sds_start_remote (dummy)
-     PTR dummy;
-{
-  char c;
-  unsigned char buf[200];
-
-  immediate_quit = 1;		/* Allow user to interrupt it */
-
-  /* Ack any packet which the remote side has already sent.  */
-  SERIAL_WRITE (sds_desc, "{#*\r\n", 5);
-  SERIAL_WRITE (sds_desc, "{#}\r\n", 5);
-
-  while ((c = readchar (1)) >= 0)
-    printf_unfiltered ("%c", c);
-  printf_unfiltered ("\n");
-
-  next_msg_id = 251;
-
-  buf[0] = 26;
-  sds_send (buf, 1);
-
-  buf[0] = 0;
-  sds_send (buf, 1);
-
-  immediate_quit = 0;
-
-  start_remote ();		/* Initialize gdb process mechanisms */
-  return 1;
-}
-
-/* Open a connection to a remote debugger.
-   NAME is the filename used for communication.  */
-
-static DCACHE *sds_dcache;
-
-static void
-sds_open (name, from_tty)
-     char *name;
-     int from_tty;
-{
-  if (name == 0)
-    error ("To open a remote debug connection, you need to specify what serial\n\
-device is attached to the remote system (e.g. /dev/ttya).");
-
-  target_preopen (from_tty);
-
-  unpush_target (&sds_ops);
-
-  sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes);
-
-  sds_desc = SERIAL_OPEN (name);
-  if (!sds_desc)
-    perror_with_name (name);
-
-  if (baud_rate != -1)
-    {
-      if (SERIAL_SETBAUDRATE (sds_desc, baud_rate))
-	{
-	  SERIAL_CLOSE (sds_desc);
-	  perror_with_name (name);
-	}
-    }
-
-
-  SERIAL_RAW (sds_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 (sds_desc);
-
-  if (from_tty)
-    {
-      puts_filtered ("Remote debugging using ");
-      puts_filtered (name);
-      puts_filtered ("\n");
-    }
-  push_target (&sds_ops);	/* Switch to using remote target now */
-
-  just_started = 1;
-
-  /* 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 (sds_start_remote, NULL, 
-		     "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.  */
-
-static void
-sds_detach (args, from_tty)
-     char *args;
-     int from_tty;
-{
-  char buf[PBUFSIZ];
-
-  if (args)
-    error ("Argument given to \"detach\" when remotely debugging.");
-
-#if 0
-  /* Tell the remote target to detach.  */
-  strcpy (buf, "D");
-  sds_send (buf, 1);
-#endif
-
-  pop_target ();
-  if (from_tty)
-    puts_filtered ("Ending remote debugging.\n");
-}
-
-/* Convert hex digit A to a number.  */
-
-static int
-fromhex (a)
-     int a;
-{
-  if (a >= '0' && a <= '9')
-    return a - '0';
-  else if (a >= 'a' && a <= 'f')
-    return a - 'a' + 10;
-  else 
-    error ("Reply contains invalid hex digit %d", a);
-}
-
-/* Convert number NIB to a hex digit.  */
-
-static int
-tohex (nib)
-     int nib;
-{
-  if (nib < 10)
-    return '0'+nib;
-  else
-    return 'a'+nib-10;
-}
-
-static int
-tob64 (inbuf, outbuf, len)
-     unsigned char *inbuf;
-     char *outbuf;
-     int len;
-{
-  int i, sum;
-  char *p;
-
-  if (len % 3 != 0)
-    error ("bad length");
-
-  p = outbuf;
-  for (i = 0; i < len; i += 3)
-    {
-      /* Collect the next three bytes into a number.  */
-      sum = ((long) *inbuf++) << 16;
-      sum |= ((long) *inbuf++) <<  8;
-      sum |= ((long) *inbuf++);
-
-      /* Spit out 4 6-bit encodings.  */
-      *p++ = ((sum >> 18) & 0x3f) + '0';
-      *p++ = ((sum >> 12) & 0x3f) + '0';
-      *p++ = ((sum >>  6) & 0x3f) + '0';
-      *p++ = (sum & 0x3f) + '0';
-    }
-  return (p - outbuf);
-}
-
-static int
-fromb64 (inbuf, outbuf, len)
-     char *inbuf, *outbuf;
-     int len;
-{
-  int i, sum;
-
-  if (len % 4 != 0)
-    error ("bad length");
-
-  for (i = 0; i < len; i += 4)
-    {
-      /* Collect 4 6-bit digits.  */
-      sum  = (*inbuf++ - '0') << 18;
-      sum |= (*inbuf++ - '0') << 12;
-      sum |= (*inbuf++ - '0') <<  6;
-      sum |= (*inbuf++ - '0');
-
-      /* Now take the resulting 24-bit number and get three bytes out
-         of it.  */
-      *outbuf++ = (sum >> 16) & 0xff;
-      *outbuf++ = (sum >>  8) & 0xff;
-      *outbuf++ = sum & 0xff;
-    }
-
-  return (len / 4) * 3;
-}
-
-
-/* Tell the remote machine to resume.  */
-
-static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
-int last_sent_step;
-
-static void
-sds_resume (pid, step, siggnal)
-     int pid, step;
-     enum target_signal siggnal;
-{
-  unsigned char buf[PBUFSIZ];
-
-  dcache_flush (sds_dcache);
-
-  last_sent_signal = siggnal;
-  last_sent_step = step;
-
-  buf[0] = (step ? 21 : 20);
-  buf[1] = 0;  /* (should be signal?) */
-
-  sds_send (buf, 2);
-}
-
-/* Send a message to target to halt it.  Target will respond, and send
-   us a message pending notice.  */
-
-static void
-sds_interrupt (signo)
-     int signo;
-{
-  unsigned char buf[PBUFSIZ];
-
-  /* If this doesn't work, try more severe steps.  */
-  signal (signo, sds_interrupt_twice);
-  
-  if (remote_debug)
-    printf_unfiltered ("sds_interrupt called\n");
-
-  buf[0] = 25;
-  sds_send (buf, 1);
-}
-
-static void (*ofunc)();
-
-/* The user typed ^C twice.  */
-
-static void
-sds_interrupt_twice (signo)
-     int signo;
-{
-  signal (signo, ofunc);
-  
-  interrupt_query ();
-
-  signal (signo, sds_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.  */
-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).  */
-
-static int
-sds_wait (pid, status)
-     int pid;
-     struct target_waitstatus *status;
-{
-  unsigned char buf[PBUFSIZ];
-  int retlen;
-
-  status->kind = TARGET_WAITKIND_EXITED;
-  status->value.integer = 0;
-
-  ofunc = (void (*)()) signal (SIGINT, sds_interrupt);
-
-  signal (SIGINT, ofunc);
-
-  if (just_started)
-    {
-      just_started = 0;
-      status->kind = TARGET_WAITKIND_STOPPED;
-      return inferior_pid;
-    }
-
-  while (1)
-    {
-      getmessage (buf, 1);
-
-      if (message_pending)
-	{
-	  buf[0] = 26;
-	  retlen = sds_send (buf, 1);
-	  if (remote_debug)
-	    {
-	      fprintf_unfiltered (gdb_stderr, "Signals: %04x %02x %02x\n",
-				  ((int) buf[0]) << 8 + buf[1],
-				  buf[2], buf[3]);
-	    }
-	  message_pending = 0;
-	  status->kind = TARGET_WAITKIND_STOPPED;
-	  status->value.sig = TARGET_SIGNAL_TRAP;
-	  goto got_status;
-	}
-    }
- got_status:
-  return inferior_pid;
-}
-
-static unsigned char sprs[16];
-
-/* Read the remote registers into the block REGS.  */
-/* Currently we just read all the registers, so we don't use regno.  */
-
-/* ARGSUSED */
-static void
-sds_fetch_registers (regno)
-     int regno;
-{
-  unsigned char buf[PBUFSIZ];
-  int i, retlen;
-  char *p;
-  char regs[REGISTER_BYTES];
-
-  /* Unimplemented registers read as all bits zero.  */
-  memset (regs, 0, REGISTER_BYTES);
-
-  buf[0] = 18;
-  buf[1] = 1;
-  buf[2] = 0;
-  retlen = sds_send (buf, 3);
-
-  for (i = 0; i < 4 * 6; ++i)
-    regs[i + 4 * 32 + 8 * 32] = buf[i];
-  for (i = 0; i < 4 * 4; ++i)
-    sprs[i] = buf[i + 4 * 7];
-
-  buf[0] = 18;
-  buf[1] = 2;
-  buf[2] = 0;
-  retlen = sds_send (buf, 3);
-
-  for (i = 0; i < retlen; i++)
-    regs[i] = buf[i];
-
-  /* (should warn about reply too short) */
-
-  for (i = 0; i < NUM_REGS; i++)
-    supply_register (i, &regs[REGISTER_BYTE(i)]);
-}
-
-/* Prepare to store registers.  Since we may send them all, we have to
-   read out the ones we don't want to change first.  */
-
-static void 
-sds_prepare_to_store ()
-{
-  /* Make sure the entire registers array is valid.  */
-  read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
-}
-
-/* Store register REGNO, or all registers if REGNO == -1, from the contents
-   of REGISTERS.  FIXME: ignores errors.  */
-
-static void
-sds_store_registers (regno)
-     int regno;
-{
-  unsigned char *p, buf[PBUFSIZ];
-  int i;
-
-  /* Store all the special-purpose registers.  */
-  p = buf;
-  *p++ = 19;
-  *p++ = 1;
-  *p++ = 0;
-  *p++ = 0;
-  for (i = 0; i < 4 * 6; i++)
-    *p++ = registers[i + 4 * 32 + 8 * 32];
-  for (i = 0; i < 4 * 1; i++)
-    *p++ = 0;
-  for (i = 0; i < 4 * 4; i++)
-    *p++ = sprs[i];
-
-  sds_send (buf, p - buf);
-
-  /* Store all the general-purpose registers.  */
-  p = buf;
-  *p++ = 19;
-  *p++ = 2;
-  *p++ = 0;
-  *p++ = 0;
-  for (i = 0; i < 4 * 32; i++)
-    *p++ = registers[i];
-
-  sds_send (buf, p - buf);
-
-}
-
-/* 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
-sds_write_bytes (memaddr, myaddr, len)
-     CORE_ADDR memaddr;
-     char *myaddr;
-     int len;
-{
-  int max_buf_size;		/* Max size of packet output buffer */
-  int origlen;
-  unsigned char buf[PBUFSIZ];
-  int todo;
-  int i;
-
-  /* Chop the transfer down if necessary */
-
-  max_buf_size = 150;
-
-  origlen = len;
-  while (len > 0)
-    {
-      todo = min (len, max_buf_size);
-
-      buf[0] = 13;
-      buf[1] = 0;
-      buf[2] = (int) (memaddr >> 24) & 0xff;
-      buf[3] = (int) (memaddr >> 16) & 0xff;
-      buf[4] = (int) (memaddr >>  8) & 0xff;
-      buf[5] = (int) (memaddr      ) & 0xff;
-      buf[6] = 1;
-      buf[7] = 0;
-
-      for (i = 0; i < todo; i++)
-	buf[i + 8] = myaddr[i];
-
-      sds_send (buf, 8 + todo);
-
-      /* (should look at result) */
-
-      myaddr += todo;
-      memaddr += todo;
-      len -= todo;
-    }
-  return origlen;
-}
-
-/* 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
-sds_read_bytes (memaddr, myaddr, len)
-     CORE_ADDR memaddr;
-     char *myaddr;
-     int len;
-{
-  int max_buf_size;		/* Max size of packet output buffer */
-  int origlen, retlen;
-  unsigned char buf[PBUFSIZ];
-  int todo;
-  int i;
-
-  /* Chop the transfer down if necessary */
-
-  max_buf_size = 150;
-
-  origlen = len;
-  while (len > 0)
-    {
-      todo = min (len, max_buf_size);
-
-      buf[0] = 12;
-      buf[1] = 0;
-      buf[2] = (int) (memaddr >> 24) & 0xff;
-      buf[3] = (int) (memaddr >> 16) & 0xff;
-      buf[4] = (int) (memaddr >>  8) & 0xff;
-      buf[5] = (int) (memaddr      ) & 0xff;
-      buf[6] = (int) (todo >> 8) & 0xff;
-      buf[7] = (int) (todo     ) & 0xff;
-      buf[8] = 1;
-
-      retlen = sds_send (buf, 9);
-
-      if (retlen - 2 != todo)
-	{
-	  return 0;
-	}
-
-      /* Reply describes memory byte by byte. */
-
-      for (i = 0; i < todo; i++)
-	myaddr[i] = buf[i + 2];
-
-      myaddr += todo;
-      memaddr += todo;
-      len -= todo;
-    }
-
-  return origlen;
-}
-
-/* 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 */
-static int
-sds_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 (sds_dcache, memaddr, myaddr, len, should_write);
-}
-
-
-static void
-sds_files_info (ignore)
-     struct target_ops *ignore;
-{
-  puts_filtered ("Debugging over a serial connection, using SDS protocol.\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 end, masking it down to 7 bits. */
-
-static int
-readchar (timeout)
-     int timeout;
-{
-  int ch;
-
-  ch = SERIAL_READCHAR (sds_desc, timeout);
-
-  if (remote_debug > 1 && ch >= 0)
-    printf_unfiltered("%c(%x)", ch, ch);
-
-  switch (ch)
-    {
-    case SERIAL_EOF:
-      error ("Remote connection closed");
-    case SERIAL_ERROR:
-      perror_with_name ("Remote communication error");
-    case SERIAL_TIMEOUT:
-      return ch;
-    default:
-      return ch & 0x7f;
-    }
-}
-
-/* An SDS-style checksum is a sum of the bytes modulo 253.  (Presumably
-   because 253, 254, and 255 are special flags in the protocol.)  */
-
-static int
-compute_checksum (csum, buf, len)
-     int csum, len;
-     char *buf;
-{
-  int i;
-
-  for (i = 0; i < len; ++i)
-    csum += (unsigned char) buf[i];
-
-  csum %= 253;
-  return csum;
-}
-
-/* Send the command in BUF to the remote machine, and read the reply
-   into BUF also.  */
-
-static int
-sds_send (buf, len)
-     unsigned char *buf;
-     int len;
-{
-  putmessage (buf, len);
-
-  return getmessage (buf, 0);
-}
-
-/* Send a message to the remote machine.  */
-
-static int
-putmessage (buf, len)
-     unsigned char *buf;
-     int len;
-{
-  int i, enclen;
-  unsigned char csum = 0;
-  char buf2[PBUFSIZ], buf3[PBUFSIZ];
-  unsigned char header[3];
-  int ch;
-  int tcount = 0;
-  char *p;
-
-  /* Copy the packet into buffer BUF2, encapsulating it
-     and giving it a checksum.  */
-
-  if (len > 170)		/* Prosanity check */
-    abort();
-
-  if (remote_debug)
-    {
-      fprintf_unfiltered (gdb_stderr, "Message to send: \"");
-      for (i = 0; i < len; ++i)
-	fprintf_unfiltered (gdb_stderr, "%02x", buf[i]);
-      fprintf_unfiltered (gdb_stderr, "\"\n");
-    }
-
-  p = buf2;
-  *p++ = '$';
-
-  if (len % 3 != 0)
-    {
-      buf[len] = '\0';
-      buf[len+1] = '\0';
-    }
-
-  header[1] = next_msg_id;
-
-  header[2] = len;
-
-  csum = compute_checksum (csum, buf, len);
-  csum = compute_checksum (csum, header + 1, 2);
-
-  header[0] = csum;
-
-  tob64 (header, p, 3);
-  p += 4;
-  enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3);
-
-  for (i = 0; i < enclen; ++i)
-    *p++ = buf3[i];
-  *p++ = '\r';
-  *p++ = '\n';
-
-  next_msg_id = (next_msg_id + 3) % 245;
-
-  /* Send it over and over until we get a positive ack.  */
-
-  while (1)
-    {
-      int started_error_output = 0;
-
-      if (remote_debug)
-	{
-	  *p = '\0';
-	  printf_unfiltered ("Sending encoded: \"%s\"", buf2);
-	  printf_unfiltered ("  (Checksum %d, id %d, length %d)\n",
-			     header[0], header[1], header[2]);
-	  gdb_flush (gdb_stdout);
-	}
-      if (SERIAL_WRITE (sds_desc, buf2, p - buf2))
-	perror_with_name ("putmessage: write failed");
-
-      return 1;
-
-    }
-
-}
-
-/* Come here after finding the start of the frame.  Collect the rest
-   into BUF.  Returns 0 on any error, 1 on success.  */
-
-static int
-read_frame (buf)
-     char *buf;
-{
-  char *bp;
-  int c;
-
-  bp = buf;
-
-  while (1)
-    {
-      c = readchar (sds_timeout);
-
-      switch (c)
-	{
-	case SERIAL_TIMEOUT:
-	  if (remote_debug)
-	    puts_filtered ("Timeout in mid-message, retrying\n");
-	  return 0;
-	case '$':
-	  if (remote_debug)
-	    puts_filtered ("Saw new packet start in middle of old one\n");
-	  return 0;		/* Start a new packet, count retries */
-	case '\r':
-	  break;
-
-	case '\n':
-	  {
-	    *bp = '\000';
-	    if (remote_debug)
-	      fprintf_unfiltered (gdb_stderr, "Received encoded: \"%s\"\n",
-				  buf);
-	    return 1;
-	  }
-
-	default:
-	  if (bp < buf + PBUFSIZ - 1)
-	    {
-	      *bp++ = c;
-	      continue;
-	    }
-
-	  *bp = '\0';
-	  puts_filtered ("Message too long: ");
-	  puts_filtered (buf);
-	  puts_filtered ("\n");
-
-	  return 0;
-	}
-    }
-}
-
-/* Read a packet from the remote machine, with error checking,
-   and store it in BUF.  BUF is expected to be of size PBUFSIZ.
-   If FOREVER, wait forever rather than timing out; this is used
-   while the target is executing user code.  */
-
-static int
-getmessage (buf, forever)
-     unsigned char *buf;
-     int forever;
-{
-  int c, c2, c3;
-  int tries;
-  int timeout;
-  int val, i, len, csum;
-  unsigned char header[3];
-  unsigned char inbuf[500];
-
-  strcpy (buf, "timeout");
-
-  if (forever)
-    {
-#ifdef MAINTENANCE_CMDS
-      timeout = watchdog > 0 ? watchdog : -1;
-#else
-      timeout = -1;
-#endif
-    }
-
-  else
-    timeout = sds_timeout;
-
-#define MAX_TRIES 3
-
-  for (tries = 1; tries <= MAX_TRIES; tries++)
-    {
-      /* This can loop forever if the remote side sends us characters
-	 continuously, but if it pauses, we'll get a zero from readchar
-	 because of timeout.  Then we'll count that as a retry.  */
-
-      /* Note that we will only wait forever prior to the start of a packet.
-	 After that, we expect characters to arrive at a brisk pace.  They
-	 should show up within sds_timeout intervals.  */
-
-      do
-	{
-	  c = readchar (timeout);
-
-	  if (c == SERIAL_TIMEOUT)
-	    {
-#ifdef MAINTENANCE_CMDS
-	      if (forever)	/* Watchdog went off.  Kill the target. */
-		{
-		  target_mourn_inferior ();
-		  error ("Watchdog has expired.  Target detached.\n");
-		}
-#endif
-	      if (remote_debug)
-		puts_filtered ("Timed out.\n");
-	      goto retry;
-	    }
-	}
-      while (c != '$' && c != '{');
-
-      /* We might have seen a "trigraph", a sequence of three characters
-	 that indicate various sorts of communication state.  */
-
-      if (c == '{')
-	{
-	  /* Read the other two chars of the trigraph. */
-	  c2 = readchar (timeout);
-	  c3 = readchar (timeout);
-	  if (remote_debug)
-	    fprintf_unfiltered (gdb_stderr, "Trigraph %c%c%c received\n",
-				c, c2, c3);
-	  if (c3 == '+')
-	    {
-	      message_pending = 1;
-	      return 0; /*????*/
-	    }
-	  continue;
-	}
-
-      val = read_frame (inbuf);
-
-      if (val == 1)
-	{
-	  fromb64 (inbuf, header, 4);
-	  /* (should check out other bits) */
-	  fromb64 (inbuf + 4, buf, strlen (inbuf) - 4);
-
-	  len = header[2];
-
-	  csum = 0;
-	  csum = compute_checksum (csum, buf, len);
-	  csum = compute_checksum (csum, header + 1, 2);
-
-	  if (csum != header[0])
-	    fprintf_unfiltered (gdb_stderr,
-				"Checksum mismatch: computed %d, received %d\n",
-				csum, header[0]);
-
-	  if (header[2] == 0xff)
-	    fprintf_unfiltered (gdb_stderr, "Requesting resend...\n");
-
-	  if (remote_debug)
-	    {
-	      fprintf_unfiltered (gdb_stderr,
-				  "... (Got checksum %d, id %d, length %d)\n",
-				  header[0], header[1], header[2]);
-	      fprintf_unfiltered (gdb_stderr, "Message received: \"");
-	      for (i = 0; i < len; ++i)
-		{
-		  fprintf_unfiltered (gdb_stderr, "%02x", (unsigned char) buf[i]);
-		}
-	      fprintf_unfiltered (gdb_stderr, "\"\n");
-	    }
-
-	  /* no ack required? */
-	  return len;
-	}
-
-      /* Try the whole thing again.  */
-    retry:
-      /* need to do something here */
-    }
-
-  /* We have tried hard enough, and just can't receive the packet.  Give up. */
-
-  printf_unfiltered ("Ignoring packet error, continuing...\n");
-  return 0;
-}
-
-static void
-sds_kill ()
-{
-  /* Don't try to do anything to the target.  */
-}
-
-static void
-sds_mourn ()
-{
-  unpush_target (&sds_ops);
-  generic_mourn_inferior ();
-}
-
-static void
-sds_create_inferior (exec_file, args, env)
-     char *exec_file;
-     char *args;
-     char **env;
-{
-  inferior_pid = 42000;
-
-  /* Clean up from the last time we were running.  */
-  clear_proceed_status ();
-
-  /* Let the remote process run.  */
-  proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0);
-}
-
-static void
-sds_load (filename, from_tty)
-    char *filename;
-    int from_tty;
-{
-  generic_load (filename, from_tty);
-
-  inferior_pid = 0;
-}
-
-/* The SDS monitor has commands for breakpoint insertion, although it
-   it doesn't actually manage the breakpoints, it just returns the
-   replaced instruction back to the debugger.  */
-
-static int
-sds_insert_breakpoint (addr, contents_cache)
-     CORE_ADDR addr;
-     char *contents_cache;
-{
-  int i, retlen;
-  unsigned char *p, buf[PBUFSIZ];
-
-  p = buf;
-  *p++ = 16;
-  *p++ = 0;
-  *p++ = (int) (addr >> 24) & 0xff;
-  *p++ = (int) (addr >> 16) & 0xff;
-  *p++ = (int) (addr >>  8) & 0xff;
-  *p++ = (int) (addr      ) & 0xff;
-  
-  retlen = sds_send (buf, p - buf);
-
-  for (i = 0; i < 4; ++i)
-    contents_cache[i] = buf[i + 2];
-
-  return 0;
-}
-
-static int
-sds_remove_breakpoint (addr, contents_cache)
-     CORE_ADDR addr;
-     char *contents_cache;
-{
-  int i, retlen;
-  unsigned char *p, buf[PBUFSIZ];
-
-  p = buf;
-  *p++ = 17;
-  *p++ = 0;
-  *p++ = (int) (addr >> 24) & 0xff;
-  *p++ = (int) (addr >> 16) & 0xff;
-  *p++ = (int) (addr >>  8) & 0xff;
-  *p++ = (int) (addr      ) & 0xff;
-  for (i = 0; i < 4; ++i)
-    *p++ = contents_cache[i];
-
-  retlen = sds_send (buf, p - buf);
-
-  return 0;
-}
-
-static void 
-init_sds_ops ()
-{
-  sds_ops.to_shortname = "sds";
-  sds_ops.to_longname = "Remote serial target with SDS protocol";
-  sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\
-Specify the serial device it is connected to (e.g. /dev/ttya).";
-  sds_ops.to_open = sds_open;
-  sds_ops.to_close = sds_close;
-  sds_ops.to_detach = sds_detach;
-  sds_ops.to_resume = sds_resume;
-  sds_ops.to_wait = sds_wait;
-  sds_ops.to_fetch_registers = sds_fetch_registers;
-  sds_ops.to_store_registers = sds_store_registers;
-  sds_ops.to_prepare_to_store = sds_prepare_to_store;
-  sds_ops.to_xfer_memory = sds_xfer_memory;
-  sds_ops.to_files_info = sds_files_info;
-  sds_ops.to_insert_breakpoint = sds_insert_breakpoint;
-  sds_ops.to_remove_breakpoint = sds_remove_breakpoint;
-  sds_ops.to_kill = sds_kill;
-  sds_ops.to_load = sds_load;
-  sds_ops.to_create_inferior = sds_create_inferior;
-  sds_ops.to_mourn_inferior = sds_mourn;
-  sds_ops.to_stratum = process_stratum;
-  sds_ops.to_has_all_memory = 1;
-  sds_ops.to_has_memory = 1;
-  sds_ops.to_has_stack = 1;
-  sds_ops.to_has_registers = 1;
-  sds_ops.to_has_execution = 1;
-  sds_ops.to_magic = OPS_MAGIC;
-}
-
-/* Put a command string, in args, out to the monitor and display the
-   reply message.  */
-
-static void
-sds_command (args, from_tty)
-     char *args;
-     int from_tty;
-{
-  char *p;
-  int i, len, retlen;
-  unsigned char buf[1000];
-
-  /* Convert hexadecimal chars into a byte buffer.  */
-  p = args;
-  len = 0;
-  while (*p != '\0')
-    {
-      buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]);
-      if (p[1] == '\0')
-	break;
-      p += 2;
-    }
-
-  retlen = sds_send (buf, len);
-
-  printf_filtered ("Reply is ");
-  for (i = 0; i < retlen; ++i)
-    {
-      printf_filtered ("%02x", buf[i]);
-    }  
-  printf_filtered ("\n");
-}
-
-void
-_initialize_remote_sds ()
-{
-  init_sds_ops ();
-  add_target (&sds_ops);
-
-  add_show_from_set (add_set_cmd ("sdstimeout", no_class,
-				  var_integer, (char *)&sds_timeout,
-				  "Set timeout value for sds read.\n", &setlist),
-		     &showlist);
-
-  add_com ("sds", class_obscure, sds_command,
-	   "Send a command to the SDS monitor."); 
-}