Initial revision

1 files changed, 1056 insertions, 0 deletions

diff --git a/gdb/remote-eb.c b/gdb/remote-eb.c
new file mode 100644
index 00000000000..d3a3c4169c1
--- /dev/null
+++ b/gdb/remote-eb.c
@@ -0,0 +1,1056 @@
+/* Remote debugging interface for AMD 29000 EBMON on IBM PC, for GDB.
+   Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.  Written by Jim Kingdon for Cygnus.
+
+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 is like remote.c but is for an esoteric situation--
+   having a a29k board in a PC hooked up to a unix machine with
+   a serial line, and running ctty com1 on the PC, through which
+   the unix machine can run ebmon.  Not to mention that the PC
+   has PC/NFS, so it can access the same executables that gdb can,
+   over the net in real time.  */
+
+#include "defs.h"
+#include "gdb_string.h"
+
+#include "inferior.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "wait.h"
+#include "value.h"
+#include <ctype.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <errno.h>
+#include "terminal.h"
+#include "target.h"
+#include "gdbcore.h"
+
+extern struct target_ops eb_ops;		/* Forward declaration */
+
+static void eb_close();
+
+#define LOG_FILE "eb.log"
+#if defined (LOG_FILE)
+FILE *log_file;
+#endif
+
+static int timeout = 24;
+
+/* Descriptor for I/O to remote machine.  Initialize it to -1 so that
+   eb_open knows that we don't have a file open when the program
+   starts.  */
+int eb_desc = -1;
+
+/* stream which is fdopen'd from eb_desc.  Only valid when
+   eb_desc != -1.  */
+FILE *eb_stream;
+
+/* Read a character from the remote system, doing all the fancy
+   timeout stuff.  */
+static int
+readchar ()
+{
+  char buf;
+
+  buf = '\0';
+#ifdef HAVE_TERMIO
+  /* termio does the timeout for us.  */
+  read (eb_desc, &buf, 1);
+#else
+  alarm (timeout);
+  if (read (eb_desc, &buf, 1) < 0)
+    {
+      if (errno == EINTR)
+	error ("Timeout reading from remote system.");
+      else
+	perror_with_name ("remote");
+    }
+  alarm (0);
+#endif
+
+  if (buf == '\0')
+    error ("Timeout reading from remote system.");
+#if defined (LOG_FILE)
+  putc (buf & 0x7f, log_file);
+#endif
+  return buf & 0x7f;
+}
+
+/* Keep discarding input from the remote system, until STRING is found. 
+   Let the user break out immediately.  */
+static void
+expect (string)
+     char *string;
+{
+  char *p = string;
+
+  immediate_quit = 1;
+  while (1)
+    {
+      if (readchar() == *p)
+	{
+	  p++;
+	  if (*p == '\0')
+	    {
+	      immediate_quit = 0;
+	      return;
+	    }
+	}
+      else
+	p = string;
+    }
+}
+
+/* Keep discarding input until we see the ebmon prompt.
+
+   The convention for dealing with the prompt is that you
+   o give your command
+   o *then* wait for the prompt.
+
+   Thus the last thing that a procedure does with the serial line
+   will be an expect_prompt().  Exception:  eb_resume does not
+   wait for the prompt, because the terminal is being handed over
+   to the inferior.  However, the next thing which happens after that
+   is a eb_wait which does wait for the prompt.
+   Note that this includes abnormal exit, e.g. error().  This is
+   necessary to prevent getting into states from which we can't
+   recover.  */
+static void
+expect_prompt ()
+{
+#if defined (LOG_FILE)
+  /* This is a convenient place to do this.  The idea is to do it often
+     enough that we never lose much data if we terminate abnormally.  */
+  fflush (log_file);
+#endif
+  expect ("\n# ");
+}
+
+/* Get a hex digit from the remote system & return its value.
+   If ignore_space is nonzero, ignore spaces (not newline, tab, etc).  */
+static int
+get_hex_digit (ignore_space)
+     int ignore_space;
+{
+  int ch;
+  while (1)
+    {
+      ch = readchar ();
+      if (ch >= '0' && ch <= '9')
+	return ch - '0';
+      else if (ch >= 'A' && ch <= 'F')
+	return ch - 'A' + 10;
+      else if (ch >= 'a' && ch <= 'f')
+	return ch - 'a' + 10;
+      else if (ch == ' ' && ignore_space)
+	;
+      else
+	{
+	  expect_prompt ();
+	  error ("Invalid hex digit from remote system.");
+	}
+    }
+}
+
+/* Get a byte from eb_desc and put it in *BYT.  Accept any number
+   leading spaces.  */
+static void
+get_hex_byte (byt)
+     char *byt;
+{
+  int val;
+
+  val = get_hex_digit (1) << 4;
+  val |= get_hex_digit (0);
+  *byt = val;
+}
+
+/* Get N 32-bit words from remote, each preceded by a space,
+   and put them in registers starting at REGNO.  */
+static void
+get_hex_regs (n, regno)
+     int n;
+     int regno;
+{
+  long val;
+  int i;
+
+  for (i = 0; i < n; i++)
+    {
+      int j;
+      
+      val = 0;
+      for (j = 0; j < 8; j++)
+	val = (val << 4) + get_hex_digit (j == 0);
+      supply_register (regno++, (char *) &val);
+    }
+}
+
+/* Called when SIGALRM signal sent due to alarm() timeout.  */
+#ifndef HAVE_TERMIO
+
+#ifndef __STDC__
+#define volatile /**/
+#endif
+volatile int n_alarms;
+
+void
+eb_timer ()
+{
+#if 0
+  if (kiodebug)
+    printf ("eb_timer called\n");
+#endif
+  n_alarms++;
+}
+#endif
+
+/* malloc'd name of the program on the remote system.  */
+static char *prog_name = NULL;
+
+/* Nonzero if we have loaded the file ("yc") and not yet issued a "gi"
+   command.  "gi" is supposed to happen exactly once for each "yc".  */
+static int need_gi = 0;
+
+/* Number of SIGTRAPs we need to simulate.  That is, the next
+   NEED_ARTIFICIAL_TRAP calls to eb_wait should just return
+   SIGTRAP without actually waiting for anything.  */
+
+static int need_artificial_trap = 0;
+
+/* This is called not only when we first attach, but also when the
+   user types "run" after having attached.  */
+static void
+eb_create_inferior (execfile, args, env)
+     char *execfile;
+     char *args;
+     char **env;
+{
+  int entry_pt;
+
+  if (args && *args)
+    error ("Can't pass arguments to remote EBMON process");
+
+  if (execfile == 0 || exec_bfd == 0)
+    error ("No executable file specified");
+
+  entry_pt = (int) bfd_get_start_address (exec_bfd);
+
+  {
+    /* OK, now read in the file.  Y=read, C=COFF, D=no symbols
+       0=start address, %s=filename.  */
+
+    fprintf (eb_stream, "YC D,0:%s", prog_name);
+
+    if (args != NULL)
+	fprintf(eb_stream, " %s", args);
+
+    fprintf (eb_stream, "\n");
+    fflush (eb_stream);
+
+    expect_prompt ();
+
+    need_gi = 1;
+  }
+
+/* The "process" (board) is already stopped awaiting our commands, and
+   the program is already downloaded.  We just set its PC and go.  */
+
+  clear_proceed_status ();
+
+  /* Tell wait_for_inferior that we've started a new process.  */
+  init_wait_for_inferior ();
+
+  /* Set up the "saved terminal modes" of the inferior
+     based on what modes we are starting it with.  */
+  target_terminal_init ();
+
+  /* Install inferior's terminal modes.  */
+  target_terminal_inferior ();
+
+  /* insert_step_breakpoint ();  FIXME, do we need this?  */
+  proceed ((CORE_ADDR)entry_pt, TARGET_SIGNAL_DEFAULT, 0);		/* Let 'er rip... */
+}
+
+/* Translate baud rates from integers to damn B_codes.  Unix should
+   have outgrown this crap years ago, but even POSIX wouldn't buck it.  */
+
+#ifndef B19200
+#define B19200 EXTA
+#endif
+#ifndef B38400
+#define B38400 EXTB
+#endif
+
+struct {int rate, damn_b;} baudtab[] = {
+	{0, B0},
+	{50, B50},
+	{75, B75},
+	{110, B110},
+	{134, B134},
+	{150, B150},
+	{200, B200},
+	{300, B300},
+	{600, B600},
+	{1200, B1200},
+	{1800, B1800},
+	{2400, B2400},
+	{4800, B4800},
+	{9600, B9600},
+	{19200, B19200},
+	{38400, B38400},
+	{-1, -1},
+};
+
+int damn_b (rate)
+     int rate;
+{
+  int i;
+
+  for (i = 0; baudtab[i].rate != -1; i++)
+    if (rate == baudtab[i].rate) return baudtab[i].damn_b;
+  return B38400;	/* Random */
+}
+
+
+/* Open a connection to a remote debugger.
+   NAME is the filename used for communication, then a space,
+   then the name of the program as we should name it to EBMON.  */
+
+static int baudrate = 9600;
+static char *dev_name;
+void
+eb_open (name, from_tty)
+     char *name;
+     int from_tty;
+{
+  TERMINAL sg;
+
+  char *p;
+
+  target_preopen (from_tty);
+  
+  /* Find the first whitespace character, it separates dev_name from
+     prog_name.  */
+  if (name == 0)
+    goto erroid;
+
+  for (p = name;
+       *p != '\0' && !isspace (*p); p++)
+    ;
+  if (*p == '\0')
+erroid:
+    error ("\
+Please include the name of the device for the serial port,\n\
+the baud rate, and the name of the program to run on the remote system.");
+  dev_name = alloca (p - name + 1);
+  strncpy (dev_name, name, p - name);
+  dev_name[p - name] = '\0';
+
+  /* Skip over the whitespace after dev_name */
+  for (; isspace (*p); p++)
+    /*EMPTY*/;
+  
+  if (1 != sscanf (p, "%d ", &baudrate))
+    goto erroid;
+
+  /* Skip the number and then the spaces */
+  for (; isdigit (*p); p++)
+    /*EMPTY*/;
+  for (; isspace (*p); p++)
+    /*EMPTY*/;
+  
+  if (prog_name != NULL)
+    free (prog_name);
+  prog_name = savestring (p, strlen (p));
+
+  eb_close (0);
+
+  eb_desc = open (dev_name, O_RDWR);
+  if (eb_desc < 0)
+    perror_with_name (dev_name);
+  ioctl (eb_desc, TIOCGETP, &sg);
+#ifdef HAVE_TERMIO
+  sg.c_cc[VMIN] = 0;		/* read with timeout.  */
+  sg.c_cc[VTIME] = timeout * 10;
+  sg.c_lflag &= ~(ICANON | ECHO);
+  sg.c_cflag = (sg.c_cflag & ~CBAUD) | damn_b (baudrate);
+#else
+  sg.sg_ispeed = damn_b (baudrate);
+  sg.sg_ospeed = damn_b (baudrate);
+  sg.sg_flags |= RAW | ANYP;
+  sg.sg_flags &= ~ECHO;
+#endif
+
+  ioctl (eb_desc, TIOCSETP, &sg);
+  eb_stream = fdopen (eb_desc, "r+");
+
+  push_target (&eb_ops);
+  if (from_tty)
+    printf ("Remote %s debugging %s using %s\n", target_shortname,
+	    prog_name, dev_name);
+
+#ifndef HAVE_TERMIO
+#ifndef NO_SIGINTERRUPT
+  /* Cause SIGALRM's to make reads fail with EINTR instead of resuming
+     the read.  */
+  if (siginterrupt (SIGALRM, 1) != 0)
+    perror ("eb_open: error in siginterrupt");
+#endif
+
+  /* Set up read timeout timer.  */
+  if ((void (*)) signal (SIGALRM, eb_timer) == (void (*)) -1)
+    perror ("eb_open: error in signal");
+#endif
+
+#if defined (LOG_FILE)
+  log_file = fopen (LOG_FILE, "w");
+  if (log_file == NULL)
+    perror_with_name (LOG_FILE);
+#endif
+
+  /* Hello?  Are you there?  */
+  write (eb_desc, "\n", 1);
+  
+  expect_prompt ();
+}
+
+/* Close out all files and local state before this target loses control. */
+
+static void
+eb_close (quitting)
+     int quitting;
+{
+
+  /* Due to a bug in Unix, fclose closes not only the stdio stream,
+     but also the file descriptor.  So we don't actually close
+     eb_desc.  */
+  if (eb_stream)
+    fclose (eb_stream);	/* This also closes eb_desc */
+  if (eb_desc >= 0)
+    /* close (eb_desc); */
+
+  /* Do not try to close eb_desc again, later in the program.  */
+  eb_stream = NULL;
+  eb_desc = -1;
+
+#if defined (LOG_FILE)
+  if (log_file) {
+    if (ferror (log_file))
+      printf ("Error writing log file.\n");
+    if (fclose (log_file) != 0)
+      printf ("Error closing log file.\n");
+  }
+#endif
+}
+
+/* Terminate the open connection to the remote debugger.
+   Use this when you want to detach and do something else
+   with your gdb.  */
+void
+eb_detach (from_tty)
+     int from_tty;
+{
+  pop_target();		/* calls eb_close to do the real work */
+  if (from_tty)
+    printf ("Ending remote %s debugging\n", target_shortname);
+}
+ 
+/* Tell the remote machine to resume.  */
+
+void
+eb_resume (pid, step, sig)
+     int pid, step;
+     enum target_signal sig;
+{
+  if (step)
+    {
+      write (eb_desc, "t 1,s\n", 6);
+      /* Wait for the echo.  */
+      expect ("t 1,s\r");
+      /* Then comes a line containing the instruction we stepped to.  */
+      expect ("\n@");
+      /* Then we get the prompt.  */
+      expect_prompt ();
+
+      /* Force the next eb_wait to return a trap.  Not doing anything
+         about I/O from the target means that the user has to type
+         "continue" to see any.  This should be fixed.  */
+      need_artificial_trap = 1;
+    }
+  else
+    {
+      if (need_gi)
+	{
+	  need_gi = 0;
+	  write (eb_desc, "gi\n", 3);
+	  
+	  /* Swallow the echo of "gi".  */
+	  expect ("gi\r");
+	}
+      else
+	{
+	  write (eb_desc, "GR\n", 3);
+	  /* Swallow the echo.  */
+	  expect ("GR\r");
+	}
+    }
+}
+
+/* Wait until the remote machine stops, then return,
+   storing status in STATUS just as `wait' would.  */
+
+int
+eb_wait (status)
+     struct target_waitstatus *status;
+{
+  /* Strings to look for.  '?' means match any single character.  
+     Note that with the algorithm we use, the initial character
+     of the string cannot recur in the string, or we will not
+     find some cases of the string in the input.  */
+  
+  static char bpt[] = "Invalid interrupt taken - #0x50 - ";
+  /* It would be tempting to look for "\n[__exit + 0x8]\n"
+     but that requires loading symbols with "yc i" and even if
+     we did do that we don't know that the file has symbols.  */
+  static char exitmsg[] = "\n@????????I    JMPTI     GR121,LR0";
+  char *bp = bpt;
+  char *ep = exitmsg;
+
+  /* Large enough for either sizeof (bpt) or sizeof (exitmsg) chars.  */
+  char swallowed[50];
+  /* Current position in swallowed.  */
+  char *swallowed_p = swallowed;
+
+  int ch;
+  int ch_handled;
+
+  int old_timeout = timeout;
+
+  status->kind = TARGET_WAITKIND_EXITED;
+  status->value.integer = 0;
+
+  if (need_artificial_trap != 0)
+    {
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_TRAP;
+      need_artificial_trap--;
+      return 0;
+    }
+
+  timeout = 0;		/* Don't time out -- user program is running. */
+  while (1)
+    {
+      ch_handled = 0;
+      ch = readchar ();
+      if (ch == *bp)
+	{
+	  bp++;
+	  if (*bp == '\0')
+	    break;
+	  ch_handled = 1;
+
+	  *swallowed_p++ = ch;
+	}
+      else
+	bp = bpt;
+
+      if (ch == *ep || *ep == '?')
+	{
+	  ep++;
+	  if (*ep == '\0')
+	    break;
+
+	  if (!ch_handled)
+	    *swallowed_p++ = ch;
+	  ch_handled = 1;
+	}
+      else
+	ep = exitmsg;
+
+      if (!ch_handled)
+	{
+	  char *p;
+
+	  /* Print out any characters which have been swallowed.  */
+	  for (p = swallowed; p < swallowed_p; ++p)
+	    putc (*p, stdout);
+	  swallowed_p = swallowed;
+	  
+	  putc (ch, stdout);
+	}
+    }
+  expect_prompt ();
+  if (*bp== '\0')
+    {
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_TRAP;
+    }
+  else
+    {
+      status->kind = TARGET_WAITKIND_EXITED;
+      status->value.integer = 0;
+    }
+  timeout = old_timeout;
+
+  return 0;
+}
+
+/* Return the name of register number REGNO
+   in the form input and output by EBMON.
+
+   Returns a pointer to a static buffer containing the answer.  */
+static char *
+get_reg_name (regno)
+     int regno;
+{
+  static char buf[80];
+  if (regno >= GR96_REGNUM && regno < GR96_REGNUM + 32)
+    sprintf (buf, "GR%03d", regno - GR96_REGNUM + 96);
+  else if (regno >= LR0_REGNUM && regno < LR0_REGNUM + 128)
+    sprintf (buf, "LR%03d", regno - LR0_REGNUM);
+  else if (regno == Q_REGNUM)
+    strcpy (buf, "SR131");
+  else if (regno >= BP_REGNUM && regno <= CR_REGNUM)
+    sprintf (buf, "SR%03d", regno - BP_REGNUM + 133);
+  else if (regno == ALU_REGNUM)
+    strcpy (buf, "SR132");
+  else if (regno >= IPC_REGNUM && regno <= IPB_REGNUM)
+    sprintf (buf, "SR%03d", regno - IPC_REGNUM + 128);
+  else if (regno >= VAB_REGNUM && regno <= LRU_REGNUM)
+    sprintf (buf, "SR%03d", regno - VAB_REGNUM);
+  else if (regno == GR1_REGNUM)
+    strcpy (buf, "GR001");
+  return buf;
+}
+
+/* Read the remote registers into the block REGS.  */
+
+static void
+eb_fetch_registers ()
+{
+  int reg_index;
+  int regnum_index;
+  char tempbuf[10];
+  int i;
+
+#if 0
+  /* This should not be necessary, because one is supposed to read the
+     registers only when the inferior is stopped (at least with
+     ptrace() and why not make it the same for remote?).  */
+  /* ^A is the "normal character" used to make sure we are talking to EBMON
+     and not to the program being debugged.  */
+  write (eb_desc, "\001\n");
+  expect_prompt ();
+#endif
+
+  write (eb_desc, "dw gr96,gr127\n", 14);
+  for (reg_index = 96, regnum_index = GR96_REGNUM;
+       reg_index < 128;
+       reg_index += 4, regnum_index += 4)
+    {
+      sprintf (tempbuf, "GR%03d ", reg_index);
+      expect (tempbuf);
+      get_hex_regs (4, regnum_index);
+      expect ("\n");
+    }
+
+  for (i = 0; i < 128; i += 32)
+    {
+      /* The PC has a tendency to hang if we get these
+	 all in one fell swoop ("dw lr0,lr127").  */
+      sprintf (tempbuf, "dw lr%d\n", i);
+      write (eb_desc, tempbuf, strlen (tempbuf));
+      for (reg_index = i, regnum_index = LR0_REGNUM + i;
+	   reg_index < i + 32;
+	   reg_index += 4, regnum_index += 4)
+	{
+	  sprintf (tempbuf, "LR%03d ", reg_index);
+	  expect (tempbuf);
+	  get_hex_regs (4, regnum_index);
+	  expect ("\n");
+	}
+    }
+
+  write (eb_desc, "dw sr133,sr133\n", 15);
+  expect ("SR133          ");
+  get_hex_regs (1, BP_REGNUM);
+  expect ("\n");
+
+  write (eb_desc, "dw sr134,sr134\n", 15);
+  expect ("SR134                   ");
+  get_hex_regs (1, FC_REGNUM);
+  expect ("\n");
+
+  write (eb_desc, "dw sr135,sr135\n", 15);
+  expect ("SR135                            ");
+  get_hex_regs (1, CR_REGNUM);
+  expect ("\n");
+
+  write (eb_desc, "dw sr131,sr131\n", 15);
+  expect ("SR131                            ");
+  get_hex_regs (1, Q_REGNUM);
+  expect ("\n");
+
+  write (eb_desc, "dw sr0,sr14\n", 12);
+  for (reg_index = 0, regnum_index = VAB_REGNUM;
+       regnum_index <= LRU_REGNUM;
+       regnum_index += 4, reg_index += 4)
+    {
+      sprintf (tempbuf, "SR%03d ", reg_index);
+      expect (tempbuf);
+      get_hex_regs (reg_index == 12 ? 3 : 4, regnum_index);
+      expect ("\n");
+    }
+
+  /* There doesn't seem to be any way to get these.  */
+  {
+    int val = -1;
+    supply_register (FPE_REGNUM, (char *) &val);
+    supply_register (INTE_REGNUM, (char *) &val);
+    supply_register (FPS_REGNUM, (char *) &val);
+    supply_register (EXO_REGNUM, (char *) &val);
+  }
+
+  write (eb_desc, "dw gr1,gr1\n", 11);
+  expect ("GR001 ");
+  get_hex_regs (1, GR1_REGNUM);
+  expect_prompt ();
+}
+
+/* Fetch register REGNO, or all registers if REGNO is -1.
+   Returns errno value.  */
+void
+eb_fetch_register (regno)
+     int regno;
+{
+  if (regno == -1)
+    eb_fetch_registers ();
+  else
+    {
+      char *name = get_reg_name (regno);
+      fprintf (eb_stream, "dw %s,%s\n", name, name);
+      expect (name);
+      expect (" ");
+      get_hex_regs (1, regno);
+      expect_prompt ();
+    }
+  return;
+}
+
+/* Store the remote registers from the contents of the block REGS.  */
+
+static void
+eb_store_registers ()
+{
+  int i, j;
+  fprintf (eb_stream, "s gr1,%x\n", read_register (GR1_REGNUM));
+  expect_prompt ();
+
+  for (j = 0; j < 32; j += 16)
+    {
+      fprintf (eb_stream, "s gr%d,", j + 96);
+      for (i = 0; i < 15; ++i)
+	fprintf (eb_stream, "%x,", read_register (GR96_REGNUM + j + i));
+      fprintf (eb_stream, "%x\n", read_register (GR96_REGNUM + j + 15));
+      expect_prompt ();
+    }
+
+  for (j = 0; j < 128; j += 16)
+    {
+      fprintf (eb_stream, "s lr%d,", j);
+      for (i = 0; i < 15; ++i)
+	fprintf (eb_stream, "%x,", read_register (LR0_REGNUM + j + i));
+      fprintf (eb_stream, "%x\n", read_register (LR0_REGNUM + j + 15));
+      expect_prompt ();
+    }
+
+  fprintf (eb_stream, "s sr133,%x,%x,%x\n", read_register (BP_REGNUM),
+	   read_register (FC_REGNUM), read_register (CR_REGNUM));
+  expect_prompt ();
+  fprintf (eb_stream, "s sr131,%x\n", read_register (Q_REGNUM));
+  expect_prompt ();
+  fprintf (eb_stream, "s sr0,");
+  for (i = 0; i < 11; ++i)
+    fprintf (eb_stream, "%x,", read_register (VAB_REGNUM + i));
+  fprintf (eb_stream, "%x\n", read_register (VAB_REGNUM + 11));
+  expect_prompt ();
+}
+
+/* Store register REGNO, or all if REGNO == 0.
+   Return errno value.  */
+void
+eb_store_register (regno)
+     int regno;
+{
+  if (regno == -1)
+    eb_store_registers ();
+  else
+    {
+      char *name = get_reg_name (regno);
+      fprintf (eb_stream, "s %s,%x\n", name, read_register (regno));
+      /* Setting GR1 changes the numbers of all the locals, so
+	 invalidate the register cache.  Do this *after* calling
+	 read_register, because we want read_register to return the
+	 value that write_register has just stuffed into the registers
+	 array, not the value of the register fetched from the
+	 inferior.  */
+      if (regno == GR1_REGNUM)
+	registers_changed ();
+      expect_prompt ();
+    }
+}
+
+/* Get ready to modify the registers array.  On machines which store
+   individual registers, this doesn't need to do anything.  On machines
+   which store all the registers in one fell swoop, this makes sure
+   that registers contains all the registers from the program being
+   debugged.  */
+
+void
+eb_prepare_to_store ()
+{
+  /* Do nothing, since we can store individual regs */
+}
+
+
+/* FIXME-someday!  Merge these two.  */
+int
+eb_xfer_inferior_memory (memaddr, myaddr, len, write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     struct target_ops *target;		/* ignored */
+{
+  if (write)
+    return eb_write_inferior_memory (memaddr, myaddr, len);
+  else
+    return eb_read_inferior_memory (memaddr, myaddr, len);
+}
+
+void
+eb_files_info ()
+{
+  printf ("\tAttached to %s at %d baud and running program %s.\n",
+	  dev_name, baudrate, prog_name);
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.  Returns length moved.  */
+int
+eb_write_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  int i;
+
+  for (i = 0; i < len; i++)
+    {
+      if ((i % 16) == 0)
+	fprintf (eb_stream, "sb %x,", memaddr + i);
+      if ((i % 16) == 15 || i == len - 1)
+	{
+	  fprintf (eb_stream, "%x\n", ((unsigned char *)myaddr)[i]);
+	  expect_prompt ();
+	}
+      else
+	fprintf (eb_stream, "%x,", ((unsigned char *)myaddr)[i]);
+    }
+  return len;
+}
+
+/* Read LEN bytes from inferior memory at MEMADDR.  Put the result
+   at debugger address MYADDR.  Returns length moved.  */
+int
+eb_read_inferior_memory(memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  int i;
+
+  /* Number of bytes read so far.  */
+  int count;
+
+  /* Starting address of this pass.  */
+  unsigned long startaddr;
+
+  /* Number of bytes to read in this pass.  */
+  int len_this_pass;
+
+  /* Note that this code works correctly if startaddr is just less
+     than UINT_MAX (well, really CORE_ADDR_MAX if there was such a
+     thing).  That is, something like
+     eb_read_bytes (CORE_ADDR_MAX - 4, foo, 4)
+     works--it never adds len to memaddr and gets 0.  */
+  /* However, something like
+     eb_read_bytes (CORE_ADDR_MAX - 3, foo, 4)
+     doesn't need to work.  Detect it and give up if there's an attempt
+     to do that.  */
+  if (((memaddr - 1) + len) < memaddr) {
+    errno = EIO;
+    return 0;
+  }
+  
+  startaddr = memaddr;
+  count = 0;
+  while (count < len)
+    {
+      len_this_pass = 16;
+      if ((startaddr % 16) != 0)
+	len_this_pass -= startaddr % 16;
+      if (len_this_pass > (len - count))
+	len_this_pass = (len - count);
+
+      fprintf (eb_stream, "db %x,%x\n", startaddr,
+	       (startaddr - 1) + len_this_pass);
+      expect ("\n");
+
+      /* Look for 8 hex digits.  */
+      i = 0;
+      while (1)
+	{
+	  if (isxdigit (readchar ()))
+	    ++i;
+	  else
+	    {
+	      expect_prompt ();
+	      error ("Hex digit expected from remote system.");
+	    }
+	  if (i >= 8)
+	    break;
+	}
+
+      expect ("  ");
+
+      for (i = 0; i < len_this_pass; i++)
+	get_hex_byte (&myaddr[count++]);
+
+      expect_prompt ();
+
+      startaddr += len_this_pass;
+    }
+  return len;
+}
+
+static void
+eb_kill (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  return;		/* Ignore attempts to kill target system */
+}
+
+/* Clean up when a program exits.
+
+   The program actually lives on in the remote processor's RAM, and may be
+   run again without a download.  Don't leave it full of breakpoint
+   instructions.  */
+
+void
+eb_mourn_inferior ()
+{
+  remove_breakpoints ();
+  unpush_target (&eb_ops);
+  generic_mourn_inferior ();	/* Do all the proper things now */
+}
+/* Define the target subroutine names */
+
+struct target_ops eb_ops ;
+
+static void 
+init_eb_ops(void)
+{
+  eb_ops.to_shortname = 	"amd-eb";
+  eb_ops.to_longname = 	"Remote serial AMD EBMON target";
+  eb_ops.to_doc = 	"Use a remote computer running EBMON connected by a serial line.\n\
+Arguments are the name of the device for the serial line,\n\
+the speed to connect at in bits per second, and the filename of the\n\
+executable as it exists on the remote computer.  For example,\n\
+target amd-eb /dev/ttya 9600 demo",
+    eb_ops.to_open = 	eb_open;
+  eb_ops.to_close = 	eb_close;
+  eb_ops.to_attach = 	0;
+  eb_ops.to_post_attach = NULL;
+  eb_ops.to_require_attach = NULL;
+  eb_ops.to_detach = 	eb_detach;
+  eb_ops.to_require_detach = NULL;
+  eb_ops.to_resume = 	eb_resume;
+  eb_ops.to_wait  = 	eb_wait;
+  eb_ops.to_post_wait = NULL;
+  eb_ops.to_fetch_registers  = 	eb_fetch_register;
+  eb_ops.to_store_registers  = 	eb_store_register;
+  eb_ops.to_prepare_to_store = 	eb_prepare_to_store;
+  eb_ops.to_xfer_memory  = 	eb_xfer_inferior_memory;
+  eb_ops.to_files_info  = 	eb_files_info;
+  eb_ops.to_insert_breakpoint = 	0;
+  eb_ops.to_remove_breakpoint = 	0;	/* Breakpoints */
+  eb_ops.to_terminal_init  = 	0;
+  eb_ops.to_terminal_inferior = 	0;
+  eb_ops.to_terminal_ours_for_output = 	0;
+  eb_ops.to_terminal_ours  = 	0;
+  eb_ops.to_terminal_info  = 	0;	/* Terminal handling */
+  eb_ops.to_kill  = 	eb_kill;
+  eb_ops.to_load  = 	generic_load;	/* load */
+  eb_ops.to_lookup_symbol = 	0; /* lookup_symbol */
+  eb_ops.to_create_inferior = 	eb_create_inferior;
+  eb_ops.to_post_startup_inferior = NULL;
+  eb_ops.to_acknowledge_created_inferior = NULL;
+  eb_ops.to_clone_and_follow_inferior = NULL;      
+  eb_ops.to_post_follow_inferior_by_clone = NULL;
+  eb_ops.to_insert_fork_catchpoint = NULL;
+  eb_ops.to_remove_fork_catchpoint = NULL;
+  eb_ops.to_insert_vfork_catchpoint = NULL;
+  eb_ops.to_remove_vfork_catchpoint = NULL;                  
+  eb_ops.to_has_forked = NULL;
+  eb_ops.to_has_vforked = NULL;            
+  eb_ops.to_can_follow_vfork_prior_to_exec = NULL;        
+  eb_ops.to_post_follow_vfork = NULL;
+  eb_ops.to_insert_exec_catchpoint = NULL;
+  eb_ops.to_remove_exec_catchpoint = NULL;
+  eb_ops.to_has_execd = NULL;
+  eb_ops.to_reported_exec_events_per_exec_call = NULL;
+  eb_ops.to_has_exited = NULL;
+  eb_ops.to_mourn_inferior = 	eb_mourn_inferior;
+  eb_ops.to_can_run  =   	0;	/* can_run */
+  eb_ops.to_notice_signals =   	0; /* notice_signals */
+  eb_ops.to_thread_alive  = 	0; /* thread-alive */
+  eb_ops.to_stop  = 	0;			/* to_stop */
+  eb_ops.to_pid_to_exec_file = NULL;
+  eb_ops.to_core_file_to_sym_file = NULL;
+  eb_ops.to_stratum = 	process_stratum;
+  eb_ops.DONT_USE = 	0; /* next */
+  eb_ops.to_has_all_memory = 	1;
+  eb_ops.to_has_memory = 	1;
+  eb_ops.to_has_stack = 	1;
+  eb_ops.to_has_registers = 	1;
+  eb_ops.to_has_execution = 	1;	/* all mem, mem, stack, regs, exec */
+  eb_ops.to_sections = 	0; /* sections */
+  eb_ops.to_sections_end = 	0; /* sections end */
+  eb_ops.to_magic = 	OPS_MAGIC;		/* Always the last thing */
+};
+
+void
+_initialize_remote_eb ()
+{
+  init_eb_ops() ;
+  add_target (&eb_ops);
+}