* remote-array.c: New file for Array Tech LSI33k based controller

	board.

1 files changed, 1403 insertions, 0 deletions

diff --git a/gdb/remote-array.c b/gdb/remote-array.c
new file mode 100644
index 0000000..7f381cd
--- /dev/null
+++ b/gdb/remote-array.c
@@ -0,0 +1,1403 @@
+/* Remote debugging interface for Array Tech RAID controller..
+   Copyright 90, 91, 92, 93, 94, 1995  Free Software Foundation, Inc.
+   Contributed by Cygnus Support. Written by Rob Savoye for Cygnus.
+
+   This module talks to a debug monitor called 'MONITOR', which
+   We communicate with MONITOR via either a direct serial line, or a TCP
+   (or possibly TELNET) stream to a terminal multiplexor,
+   which in turn talks to the target board.
+
+  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "wait.h"
+#include <varargs.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/types.h>
+#include "command.h"
+#include "serial.h"
+#include "monitor.h"
+#include "remote-utils.h"
+
+extern int baud_rate;
+
+static const char hexchars[]="0123456789abcdef";
+static char *hex2mem();
+
+#define SREC_SIZE 160
+
+#define SWAP_TARGET_AND_HOST(buffer,len) 				\
+  do									\
+    {									\
+      if (TARGET_BYTE_ORDER != HOST_BYTE_ORDER)				\
+	{								\
+	  char tmp;							\
+	  char *p = (char *)(buffer);					\
+	  char *q = ((char *)(buffer)) + len - 1;		   	\
+	  for (; p < q; p++, q--)				 	\
+	    {								\
+	      tmp = *q;							\
+	      *q = *p;							\
+	      *p = tmp;							\
+	    }								\
+	}								\
+    }									\
+  while (0)
+
+static void debuglogs();
+static void array_open();
+static void array_close();
+static void array_detach();
+static void array_attach();
+static void array_resume();
+static void array_fetch_register();
+static void array_store_register();
+static void array_fetch_registers();
+static void array_store_registers();
+static void array_prepare_to_store();
+static void array_files_info();
+static void array_kill();
+static void array_create_inferior();
+static void array_mourn_inferior();
+static void make_gdb_packet();
+static int array_xfer_memory();
+static int array_wait();
+static int array_insert_breakpoint();
+static int array_remove_breakpoint();
+static int tohex();
+static int to_hex();
+static int from_hex();
+static int array_send_packet();
+static int array_get_packet();
+static unsigned long ascii2hexword();
+static char *hexword2ascii();
+
+extern char *version;
+
+#define LOG_FILE "monitor.log"
+#if defined (LOG_FILE)
+FILE *log_file;
+#endif
+
+static int timeout = 30;
+/* Having this larger than 400 causes us to be incompatible with m68k-stub.c
+   and i386-stub.c.  Normally, no one would notice because it only matters
+   for writing large chunks of memory (e.g. in downloads).  Also, this needs
+   to be more than 400 if required to hold the registers (see below, where
+   we round it up based on REGISTER_BYTES).  */
+#define PBUFSIZ 400
+
+/* 
+ * Descriptor for I/O to remote machine.  Initialize it to NULL so that
+ * array_open knows that we don't have a file open when the program starts.
+ */
+serial_t array_desc = NULL;
+
+/*
+ * this array of registers need to match the indexes used by GDB. The
+ * whole reason this exists is cause the various ROM monitors use
+ * different strings than GDB does, and doesn't support all the
+ * registers either. So, typing "info reg sp" becomes a "r30".
+ */
+extern char *tmp_mips_processor_type;
+extern int mips_set_processor_type();
+
+static struct target_ops array_ops = {
+  "array",			/* to_shortname */
+				/* to_longname */
+  "Debug using the standard GDB remote protocol for the Array Tech target.",
+				/* to_doc */
+  "Debug using the standard GDB remote protocol for the Array Tech target.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).",
+  array_open,			/* to_open */
+  array_close,			/* to_close */
+  NULL,				/* to_attach */
+  array_detach,			/* to_detach */
+  array_resume,			/* to_resume */
+  array_wait,			/* to_wait */
+  array_fetch_registers,	/* to_fetch_registers */
+  array_store_registers,	/* to_store_registers */
+  array_prepare_to_store,	/* to_prepare_to_store */
+  array_xfer_memory,		/* to_xfer_memory */
+  array_files_info,		/* to_files_info */
+  array_insert_breakpoint,	/* to_insert_breakpoint */
+  array_remove_breakpoint,	/* to_remove_breakpoint */
+  0,				/* to_terminal_init */
+  0,				/* to_terminal_inferior */
+  0,				/* to_terminal_ours_for_output */
+  0,				/* to_terminal_ours */
+  0,				/* to_terminal_info */
+  array_kill,			/* to_kill */
+  0,				/* to_load */
+  0,				/* to_lookup_symbol */
+  array_create_inferior,	/* to_create_inferior */
+  array_mourn_inferior,		/* to_mourn_inferior */
+  0,				/* to_can_run */
+  0, 				/* to_notice_signals */
+  0,                            /* to_stop */
+  process_stratum,		/* to_stratum */
+  0,				/* to_next */
+  1,				/* to_has_all_memory */
+  1,				/* to_has_memory */
+  1,				/* to_has_stack */
+  1,				/* to_has_registers */
+  1,				/* to_has_execution */
+  0,				/* sections */
+  0,				/* sections_end */
+  OPS_MAGIC			/* to_magic */
+};
+
+/*
+ * printf_monitor -- send data to monitor.  Works just like printf.
+ */
+static void
+printf_monitor(va_alist)
+     va_dcl
+{
+  va_list args;
+  char *pattern;
+  char buf[PBUFSIZ];
+  int i;
+
+  va_start(args);
+
+  pattern = va_arg(args, char *);
+
+  vsprintf(buf, pattern, args);
+
+  debuglogs (1, "printf_monitor(), Sending: \"%s\".", buf);
+
+  if (strlen(buf) > PBUFSIZ)
+    error ("printf_monitor(): string too long");
+  if (SERIAL_WRITE(array_desc, buf, strlen(buf)))
+    fprintf(stderr, "SERIAL_WRITE failed: %s\n", safe_strerror(errno));
+}
+/*
+ * write_monitor -- send raw data to monitor.
+ */
+static void
+write_monitor(data, len)
+     char data[];
+     int len;
+{
+  if (SERIAL_WRITE(array_desc, data, len))
+    fprintf(stderr, "SERIAL_WRITE failed: %s\n", safe_strerror(errno));
+ 
+  *(data + len+1) = '\0';
+  debuglogs (1, "write_monitor(), Sending: \"%s\".", data);
+
+}
+
+/*
+ * debuglogs -- deal with debugging info to multiple sources. This takes
+ *	two real args, the first one is the level to be compared against 
+ *	the sr_get_debug() value, the second arg is a printf buffer and args
+ *	to be formatted and printed. A CR is added after each string is printed.
+ */
+static void
+debuglogs(va_alist)
+     va_dcl
+{
+  va_list args;
+  char *pattern, *p;
+  unsigned char buf[PBUFSIZ];
+  char newbuf[PBUFSIZ];
+  int level, i;
+
+  va_start(args);
+
+  level = va_arg(args, int);			/* get the debug level */
+  if ((level <0) || (level > 100)) {
+    error ("Bad argument passed to debuglogs(), needs debug level");
+    return;
+  }
+      
+  pattern = va_arg(args, char *);		/* get the printf style pattern */
+
+  vsprintf(buf, pattern, args);			/* format the string */
+  
+  /* convert some characters so it'll look right in the log */
+  p = newbuf;
+  for (i = 0 ; buf[i] != '\0'; i++) {
+    if (i > PBUFSIZ)
+      error ("Debug message too long");
+    switch (buf[i]) {
+    case '\n':					/* newlines */
+      *p++ = '\\';
+      *p++ = 'n';
+      continue;
+    case '\r':					/* carriage returns */
+      *p++ = '\\';
+      *p++ = 'r';
+      continue;
+    case '\033':				/* escape */
+      *p++ = '\\';
+      *p++ = 'e';
+      continue;
+    case '\t':					/* tab */
+      *p++ = '\\';
+      *p++ = 't';
+      continue;
+    case '\b':					/* backspace */
+      *p++ = '\\';
+      *p++ = 'b';
+      continue;
+    default:					/* no change */
+      *p++ = buf[i];
+    }
+
+    if (buf[i] < 26) {				/* modify control characters */
+      *p++ = '^';
+      *p++ = buf[i] + 'A';
+      continue;
+    }
+     if (buf[i] >= 128) {			/* modify control characters */
+      *p++ = '!';
+      *p++ = buf[i] + 'A';
+      continue;
+    }
+ }
+  *p = '\0';					/* terminate the string */
+
+  if (sr_get_debug() > level)
+    printf_unfiltered ("%s\n", newbuf);
+
+#ifdef LOG_FILE					/* write to the monitor log */
+  if (log_file != 0x0) {
+    fputs (newbuf, log_file);
+    fputc ('\n', log_file);
+    fflush (log_file);
+  }
+#endif
+}
+
+/* readchar -- read a character from the remote system, doing all the fancy
+ *	timeout stuff.
+ */
+static int
+readchar(timeout)
+     int timeout;
+{
+  int c;
+
+  c = SERIAL_READCHAR(array_desc, abs(timeout));
+
+  if (sr_get_debug() > 5) {
+    putchar(c & 0x7f);
+    debuglogs (5, "readchar: timeout = %d\n", timeout);
+  }
+
+#ifdef LOG_FILE
+  if (isascii (c))
+    putc(c & 0x7f, log_file);
+#endif
+
+  if (c >= 0)
+    return c & 0x7f;
+
+  if (c == SERIAL_TIMEOUT) {
+    if (timeout <= 0)
+      return c;		/* Polls shouldn't generate timeout errors */
+    error("Timeout reading from remote system.");
+#ifdef LOG_FILE
+      fputs ("ERROR: Timeout reading from remote system", log_file);
+#endif
+  }
+  perror_with_name("readchar");
+}
+
+/* 
+ * expect --  scan input from the remote system, until STRING is found.
+ *	If DISCARD is non-zero, then discard non-matching input, else print
+ *	it out. Let the user break out immediately.
+ */
+static void
+expect (string, discard)
+     char *string;
+     int discard;
+{
+  char *p = string;
+  int c;
+
+
+  debuglogs (1, "Expecting \"%s\".", string);
+
+  immediate_quit = 1;
+  while (1) {
+    c = readchar(timeout);
+    if (!isascii (c))
+      continue;
+    if (c == *p++) {
+      if (*p == '\0') {
+	immediate_quit = 0;
+	debuglogs (4, "Matched");
+	return;
+      }
+    } else {
+      if (!discard) {
+	fputc_unfiltered (c, gdb_stdout);
+      }
+      p = string;
+    }
+  }
+}
+
+/* Keep discarding input until we see the MONITOR array_cmds->prompt.
+
+   The convention for dealing with the expect_prompt is that you
+   o give your command
+   o *then* wait for the expect_prompt.
+
+   Thus the last thing that a procedure does with the serial line
+   will be an expect_prompt().  Exception:  array_resume does not
+   wait for the expect_prompt, because the terminal is being handed over
+   to the inferior.  However, the next thing which happens after that
+   is a array_wait which does wait for the expect_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(discard)
+     int discard;
+{
+  expect (expect_prompt, discard);
+}
+
+/*
+ * junk -- ignore junk characters. Returns a 1 if junk, 0 otherwise
+ */
+static int
+junk(ch)
+     char ch;
+{
+  switch (ch) {
+  case '\0':
+  case ' ':
+  case '-':
+  case '\t':
+  case '\r':
+  case '\n':
+    if (sr_get_debug() > 5)
+      debuglogs (5, "Ignoring \'%c\'.", ch);
+    return 1;
+  default:
+    if (sr_get_debug() > 5)
+      debuglogs (5, "Accepting \'%c\'.", ch);
+    return 0;
+  }
+}
+
+/* 
+ *  get_hex_digit -- Get a hex digit from the remote system & return its value.
+ *		If ignore is nonzero, ignore spaces, newline & tabs.
+ */
+static int
+get_hex_digit(ignore)
+     int ignore;
+{
+  static int ch;
+  while (1) {
+    ch = readchar(timeout);
+    if (junk(ch))
+      continue;
+    if (sr_get_debug() > 4) {
+      debuglogs (4, "get_hex_digit() got a 0x%x(%c)", ch, ch);
+    } else {
+#ifdef LOG_FILE					/* write to the monitor log */
+      if (log_file != 0x0) {
+	fputs ("get_hex_digit() got a 0x", log_file);
+	fputc (ch, log_file);
+	fputc ('\n', log_file);
+	fflush (log_file);
+      }
+#endif
+    }
+
+    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)
+      ;
+    else {
+     expect_prompt(1);
+      debuglogs (4, "Invalid hex digit from remote system. (0x%x)", ch);
+      error("Invalid hex digit from remote system. (0x%x)", ch);
+    }
+  }
+}
+
+/* get_hex_byte -- Get a byte from monitor 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;
+  debuglogs (4, "get_hex_byte() -- Read first nibble 0x%x", val);
+ 
+  val |= get_hex_digit (0);
+  debuglogs (4, "get_hex_byte() -- Read second nibble 0x%x", val);
+  *byt = val;
+  
+  debuglogs (4, "get_hex_byte() -- Read a 0x%x", val);
+}
+
+/* 
+ * get_hex_word --  Get N 32-bit words from remote, each preceded by a space,
+ *	and put them in registers starting at REGNO.
+ */
+static int
+get_hex_word ()
+{
+  long val, newval;
+  int i;
+
+  val = 0;
+
+#if 0
+  if (HOST_BYTE_ORDER == BIG_ENDIAN) {
+#endif
+    for (i = 0; i < 8; i++)
+      val = (val << 4) + get_hex_digit (i == 0);
+#if 0
+  } else {
+    for (i = 7; i >= 0; i--)
+      val = (val << 4) + get_hex_digit (i == 0);
+  }
+#endif
+
+  debuglogs (4, "get_hex_word() got a 0x%x for a %s host.", val, (HOST_BYTE_ORDER == BIG_ENDIAN) ? "big endian" : "little endian");
+
+  return val;
+}
+
+/* This is called not only when we first attach, but also when the
+   user types "run" after having attached.  */
+static void
+array_create_inferior (execfile, args, env)
+     char *execfile;
+     char *args;
+     char **env;
+{
+  int entry_pt;
+
+  if (args && *args)
+    error("Can't pass arguments to remote MONITOR process");
+
+  if (execfile == 0 || exec_bfd == 0)
+    error("No exec file specified");
+
+  entry_pt = (int) bfd_get_start_address (exec_bfd);
+
+/* 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?  */
+
+  /* Let 'er rip... */
+  proceed ((CORE_ADDR)entry_pt, TARGET_SIGNAL_DEFAULT, 0);
+}
+
+/*
+ * array_open -- open a connection to a remote debugger.
+ *	NAME is the filename used for communication.
+ */
+static int baudrate = 9600;
+static char dev_name[100];
+
+static void
+array_open(args, name, from_tty)
+     char *args;
+     char *name;
+     int from_tty;
+{
+  char packet[PBUFSIZ];
+
+  if (args == NULL)
+    error ("Use `target %s DEVICE-NAME' to use a serial port, or \n\
+`target %s HOST-NAME:PORT-NUMBER' to use a network connection.", name, name);
+
+/*  if (is_open) */
+    array_close(0);
+
+  tmp_mips_processor_type = "lsi33k";	/* change the default from r3051 */
+  mips_set_processor_type_command ("lsi33k", 0);
+
+  strcpy(dev_name, args);
+  array_desc = SERIAL_OPEN(dev_name);
+
+  if (array_desc == NULL)
+    perror_with_name(dev_name);
+
+  if (baud_rate != -1) {
+    if (SERIAL_SETBAUDRATE (array_desc, baud_rate)) {
+      SERIAL_CLOSE (array_desc);
+      perror_with_name (name);
+    }
+  }
+  
+  SERIAL_RAW(array_desc);
+
+#if defined (LOG_FILE)
+  log_file = fopen (LOG_FILE, "w");
+  if (log_file == NULL)
+    perror_with_name (LOG_FILE);
+  fprintf_filtered (log_file, "GDB %s (%s", version);
+  fprintf_filtered (log_file, " --target %s)\n", array_ops.to_shortname);
+  fprintf_filtered (log_file, "Remote target %s connected to %s\n\n", array_ops.to_shortname, dev_name);
+#endif
+
+  /* see if the target is alive. For a ROM monitor, we can just try to force the
+     expect_prompt to print a few times. For the GDB remote protocol, the application
+     being debugged is sitting at a breakpoint and waiting for GDB to initialize
+     the connection. We force it to give us an empty packet to see if it's alive.
+     */
+    debuglogs (3, "Trying to ACK the target's debug stub");
+    /* unless your are on the new hardware, the old board won't initialize
+       because the '+' doesn't flush output like it does on the new ROMS.
+     */
+    printf_monitor ("+");	/* ask for the last signal */
+    expect_prompt(1);		/* See if we get a expect_prompt */   
+    make_gdb_packet (packet, "?");	/* ask for a bogus packet */
+    if (array_send_packet (packet) == 0)
+      error ("Couldn't transmit packet\n");
+    printf_monitor ("+\n");	/* force it to flush stdout */
+   expect_prompt(1);		/* See if we get a expect_prompt */
+
+  if (from_tty)
+    printf("Remote target %s connected to %s\n", array_ops.to_shortname, dev_name);
+}
+
+/*
+ * array_close -- Close out all files and local state before this
+ *	target loses control.
+ */
+
+static void
+array_close (quitting)
+     int quitting;
+{
+  SERIAL_CLOSE(array_desc);
+  array_desc = NULL;
+
+  debuglogs (1, "array_close (quitting=%d)", quitting);
+
+#if defined (LOG_FILE)
+  if (log_file) {
+    if (ferror(log_file))
+      printf_filtered ("Error writing log file.\n");
+    if (fclose(log_file) != 0)
+      printf_filtered ("Error closing log file.\n");
+  }
+#endif
+}
+
+/* 
+ * array_detach -- terminate the open connection to the remote
+ *	debugger. Use this when you want to detach and do something
+ *	else with your gdb.
+ */
+static void
+array_detach (from_tty)
+     int from_tty;
+{
+
+  debuglogs (1, "array_detach ()");
+
+  pop_target();		/* calls array_close to do the real work */
+  if (from_tty)
+    printf ("Ending remote %s debugging\n", target_shortname);
+}
+
+/*
+ * array_attach -- attach GDB to the target.
+ */
+static void
+array_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  if (from_tty)
+    printf ("Starting remote %s debugging\n", target_shortname);
+ 
+  debuglogs (1, "array_attach (args=%s)", args);
+  
+  printf_monitor ("go %x\n");
+  /* swallow the echo.  */
+  expect ("go %x\n", 1);
+}
+  
+/*
+ * array_resume -- Tell the remote machine to resume.
+ */
+static void
+array_resume (pid, step, sig)
+     int pid, step;
+     enum target_signal sig;
+{
+  debuglogs (1, "array_resume (step=%d, sig=%d)", step, sig);
+
+  if (step) {
+    printf_monitor ("s\n");
+  } else {
+    printf_monitor ("go");
+  }
+}
+
+/*
+ * array_wait -- Wait until the remote machine stops, then return,
+ *          storing status in status just as `wait' would.
+ */
+static int
+array_wait (pid, status)
+     int pid;
+     struct target_waitstatus *status;
+{
+  int old_timeout = timeout;
+
+  debuglogs(1, "array_wait (), printing extraneous text.");
+  
+  status->kind = TARGET_WAITKIND_EXITED;
+  status->value.integer = 0;
+
+  timeout = 0;		/* Don't time out -- user program is running. */
+
+ expect_prompt(0);    /* Wait for expect_prompt, outputting extraneous text */
+  debuglogs (4, "array_wait(), got the expect_prompt.");
+
+  status->kind = TARGET_WAITKIND_STOPPED;
+  status->value.sig = TARGET_SIGNAL_TRAP;
+
+
+
+  timeout = old_timeout;
+
+  return 0;
+}
+
+/*
+ * array_fetch_registers -- read the remote registers into the
+ *	block regs.
+ */
+static void
+array_fetch_registers (ignored)
+     int ignored;
+{
+  int regno, i;
+  char *p;
+  unsigned char packet[PBUFSIZ];
+  char regs[REGISTER_BYTES];
+
+  debuglogs (1, "array_fetch_registers (ignored=%d)\n", ignored);
+
+  memset (packet, 0, PBUFSIZ);
+  /* Unimplemented registers read as all bits zero.  */
+  memset (regs, 0, REGISTER_BYTES);
+  make_gdb_packet (packet, "g");
+  if (array_send_packet (packet) == 0)
+    error ("Couldn't transmit packet\n");
+  if (array_get_packet (packet) == 0)
+    error ("Couldn't receive packet\n");  
+  /* FIXME: read bytes from packet */
+  debuglogs (4, "array_fetch_registers: Got a \"%s\" back\n", packet);
+  for (regno = 0; regno <= PC_REGNUM+4; regno++) {
+    /* supply register stores in target byte order, so swap here */
+    /* FIXME: convert from ASCII hex to raw bytes */
+    i = ascii2hexword (packet + (regno * 8));
+    debuglogs (5, "Adding register %d = %x\n", regno, i);
+    SWAP_TARGET_AND_HOST (&i, 4);
+    supply_register (regno, (char *)&i);
+  }
+}
+
+/* 
+ * This is unused by targets like this one that use a
+ * protocol based on GDB's remote protocol.
+ */
+static void
+array_fetch_register (ignored)
+     int ignored;
+{
+  array_fetch_registers ();
+}
+
+/*
+ * Get all the registers from the targets. They come back in a large array.
+ */
+static void
+array_store_registers (ignored)
+     int ignored;
+{
+  int regno;
+  unsigned long i;
+  char packet[PBUFSIZ];
+  char buf[PBUFSIZ];
+  char num[9];
+  
+  debuglogs (1, "array_store_registers()");
+
+  memset (packet, 0, PBUFSIZ);
+  memset (buf, 0, PBUFSIZ);
+  buf[0] = 'G';
+
+  /* Unimplemented registers read as all bits zero.  */
+  /* FIXME: read bytes from packet */
+  for (regno = 0; regno < 41; regno++) { /* FIXME */
+    /* supply register stores in target byte order, so swap here */
+    /* FIXME: convert from ASCII hex to raw bytes */
+    i = (unsigned long)read_register (regno);
+    hexword2ascii (num, i);
+    strcpy (buf+(regno * 8)+1, num);
+  }
+  *(buf + (regno * 8) + 2) = 0;
+  make_gdb_packet (packet, buf);
+  if (array_send_packet (packet) == 0)
+    error ("Couldn't transmit packet\n");
+  if (array_get_packet (packet) == 0)
+    error ("Couldn't receive packet\n");  
+  
+  registers_changed ();
+}
+
+/* 
+ * This is unused by targets like this one that use a
+ * protocol based on GDB's remote protocol.
+ */
+static void
+array_store_register (ignored)
+     int ignored;
+{
+  array_store_registers ();
+}
+
+/* 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.  */
+
+static void
+array_prepare_to_store ()
+{
+  /* Do nothing, since we can store individual regs */
+}
+
+static void
+array_files_info ()
+{
+  printf ("\tAttached to %s at %d baud.\n",
+	  dev_name, baudrate);
+}
+
+/*
+ * array_write_inferior_memory -- Copy LEN bytes of data from debugger
+ *	memory at MYADDR to inferior's memory at MEMADDR.  Returns length moved.
+ */
+static int
+array_write_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     unsigned char *myaddr;
+     int len;
+{
+  unsigned long i;
+  int j;
+  char packet[PBUFSIZ];
+  char buf[PBUFSIZ];
+  char num[9];
+  char *p;
+  
+  debuglogs (1, "array_write_inferior_memory (memaddr=0x%x, myaddr=0x%x, len=%d)", memaddr, myaddr, len);
+  memset (buf, '\0', PBUFSIZ);		/* this also sets the string terminator */
+  p = buf;
+
+  *p++ = 'M';				/* The command to write memory */
+  hexword2ascii (num, memaddr);	/* convert the address */
+  strcpy (p, num);			/* copy the address */
+  p += 8;
+  *p++ = ',';				/* add comma delimeter */
+  hexword2ascii (num, len);		/* Get the length as a 4 digit number */
+  *p++ = num[4];
+  *p++ = num[5];
+  *p++ = num[6];
+  *p++ = num[7];
+  *p++ = ':';				/* add the colon delimeter */
+  for (j = 0; j < len; j++) {		/* copy the data in after converting it */
+    *p++ = tohex ((myaddr[j] >> 4) & 0xf);
+    *p++ = tohex  (myaddr[j] & 0xf);
+  }
+  
+  make_gdb_packet (packet, buf);
+  if (array_send_packet (packet) == 0)
+    error ("Couldn't transmit packet\n");
+  if (array_get_packet (packet) == 0)
+    error ("Couldn't receive packet\n");  
+
+  return len;
+}
+
+/*
+ * array_read_inferior_memory -- read LEN bytes from inferior memory
+ *	at MEMADDR.  Put the result at debugger address MYADDR.  Returns
+ *	length moved.
+ */
+static int
+array_read_inferior_memory(memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  int i, j;
+  char buf[20];
+  char packet[PBUFSIZ];
+
+  /* Number of bytes read so far.  */
+  int count;
+
+  /* Starting address of this pass.  */
+  unsigned long startaddr;
+
+  /* Starting address of this pass.  */
+  unsigned long endaddr;
+
+  /* Number of bytes to read in this pass.  */
+  int len_this_pass;
+
+  debuglogs (1, "array_read_inferior_memory (memaddr=0x%x, myaddr=0x%x, len=%d)", memaddr, myaddr, len);
+
+  /* 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
+     array_read_bytes (CORE_ADDR_MAX - 4, foo, 4)
+     works--it never adds len To memaddr and gets 0.  */
+  /* However, something like
+     array_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);
+    
+    debuglogs (3, "Display %d bytes at %x for Big Endian host", len_this_pass, startaddr);
+    
+    for (i = 0; i < len_this_pass; i++) {
+      sprintf (buf, "m%08x,%04x", startaddr, len_this_pass);
+      make_gdb_packet (packet, buf);
+      if (array_send_packet (packet) == 0)
+	error ("Couldn't transmit packet\n");
+      if (array_get_packet (packet) == 0)
+	error ("Couldn't receive packet\n");  
+      if (*packet == 0)
+	error ("Got no data in the GDB packet\n");
+      debuglogs (4, "array_read_inferior: Got a \"%s\" back\n", packet);
+      for (j = 0; j < len_this_pass ; j++) {		/* extract the byte values */
+	myaddr[count++] = from_hex (*(packet+(j*2))) * 16 + from_hex (*(packet+(j*2)+1));
+	debuglogs (5, "myaddr set to %x\n", myaddr[count-1]);
+      }
+      startaddr += 1;
+    }
+
+  }
+  return len;
+}
+
+/* FIXME-someday!  merge these two.  */
+static int
+array_xfer_memory (memaddr, myaddr, len, write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     struct target_ops *target;		/* ignored */
+{
+  if (write)
+    return array_write_inferior_memory (memaddr, myaddr, len);
+  else
+    return array_read_inferior_memory (memaddr, myaddr, len);
+}
+
+static void
+array_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.  */
+
+static void
+array_mourn_inferior ()
+{
+  remove_breakpoints ();
+  generic_mourn_inferior ();	/* Do all the proper things now */
+}
+
+#define MAX_ARRAY_BREAKPOINTS 16
+
+extern int memory_breakpoint_size;
+static CORE_ADDR breakaddr[MAX_ARRAY_BREAKPOINTS] = {0};
+
+/*
+ * array_insert_breakpoint -- add a breakpoint
+ */
+static int
+array_insert_breakpoint (addr, shadow)
+     CORE_ADDR addr;
+     char *shadow;
+{
+  int i;
+
+  debuglogs (1, "array_insert_breakpoint() addr = 0x%x", addr);
+
+  for (i = 0; i <= MAX_ARRAY_BREAKPOINTS; i++) {
+    if (breakaddr[i] == 0) {
+      breakaddr[i] = addr;
+      if (sr_get_debug() > 4)
+	printf ("Breakpoint at %x\n", addr);
+      array_read_inferior_memory(addr, shadow, memory_breakpoint_size);
+      printf_monitor("brk 0x%x\n", addr);
+     expect_prompt(1);
+      return 0;
+    }
+  }
+
+  fprintf(stderr, "Too many breakpoints (> 16) for monitor\n");
+  return 1;
+}
+
+/*
+ * _remove_breakpoint -- Tell the monitor to remove a breakpoint
+ */
+static int
+array_remove_breakpoint (addr, shadow)
+     CORE_ADDR addr;
+     char *shadow;
+{
+  int i;
+
+  debuglogs (1, "array_remove_breakpoint() addr = 0x%x", addr);
+
+  for (i = 0; i < MAX_ARRAY_BREAKPOINTS; i++) {
+    if (breakaddr[i] == addr) {
+      breakaddr[i] = 0;
+      /* some monitors remove breakpoints based on the address */
+      printf_monitor("unbrk %x\n", i);
+     expect_prompt(1);
+      return 0;
+    }
+  }
+  fprintf(stderr, "Can't find breakpoint associated with 0x%x\n", addr);
+  return 1;
+}
+
+static void
+array_stop ()
+{
+  debuglogs (1, "array_stop()");
+  printf_monitor("\003");
+ expect_prompt(1);
+}
+
+/* 
+ * array_command -- put a command string, in args, out to MONITOR.
+ *	Output from MONITOR is placed on the users terminal until the
+ *	expect_prompt is seen. FIXME
+ */
+static void
+monitor_command (args, fromtty)
+     char	*args;
+     int	fromtty;
+{
+  debuglogs (1, "monitor_command (args=%s)", args);
+
+  if (array_desc == NULL)
+    error("monitor target not open.");
+
+  if (!args)
+    error("Missing command.");
+	
+  printf_monitor ("%s\n", args);
+  expect_prompt(0);
+}
+
+/*
+ * make_gdb_packet -- make a GDB packet. The data is always ASCII.
+ *	 A debug packet whose contents are <data>
+ *	 is encapsulated for transmission in the form:
+ *
+ *		$ <data> # CSUM1 CSUM2
+ *
+ *       <data> must be ASCII alphanumeric and cannot include characters
+ *       '$' or '#'.  If <data> starts with two characters followed by
+ *       ':', then the existing stubs interpret this as a sequence number.
+ *
+ *       CSUM1 and CSUM2 are ascii hex representation of an 8-bit 
+ *       checksum of <data>, the most significant nibble is sent first.
+ *       the hex digits 0-9,a-f are used.
+ *
+ */
+static void
+make_gdb_packet (buf, data)
+     char *buf, *data;
+{
+  int i;
+  unsigned char csum = 0;
+  int cnt;
+  char *p;
+
+  debuglogs (3, "make_gdb_packet(%s)\n", data);
+  cnt  = strlen (data);
+  if (cnt > PBUFSIZ)
+    error ("make_gdb_packet(): to much data\n");
+
+  /* start with the packet header */
+  p = buf;
+  *p++ = '$';
+
+  /* calculate the checksum */
+  for (i = 0; i < cnt; i++) {
+    csum += data[i];
+    *p++ = data[i];
+  }
+
+  /* terminate the data with a '#' */
+  *p++ = '#';
+  
+  /* add the checksum as two ascii digits */
+  *p++ = tohex ((csum >> 4) & 0xf);
+  *p++ = tohex (csum & 0xf);
+  *p  = 0x0;			/* Null terminator on string */
+}
+
+/*
+ * array_send_packet -- send a GDB packet to the target with error handling. We
+ *		get a '+' (ACK) back if the packet is received and the checksum
+ *		matches. Otherwise a '-' (NAK) is returned. It returns a 1 for a
+ *		successful transmition, or a 0 for a failure.
+ */
+static int
+array_send_packet (packet)
+     char *packet;
+{
+  int c, retries, i;
+  char junk[PBUFSIZ];
+
+  retries = 0;
+
+#if 0
+  /* scan the packet to make sure it only contains valid characters.
+     this may sound silly, but sometimes a garbled packet will hang
+     the target board. We scan the whole thing, then print the error
+     message.
+     */
+  for (i = 0; i < strlen(packet); i++) {
+    debuglogs (5, "array_send_packet(): Scanning \'%c\'\n", packet[i]);
+    /* legit hex numbers or command */
+    if ((isxdigit(packet[i])) || (isalpha(packet[i])))
+      continue;
+    switch (packet[i]) {
+    case '+':			/* ACK */
+    case '-':			/* NAK */
+    case '#':			/* end of packet */
+    case '$':			/* start of packet */
+      continue;
+    default:			/* bogus character */
+      retries++;
+      debuglogs (4, "array_send_packet(): Found a non-ascii digit \'%c\' in the packet.\n", packet[i]);
+    }
+  }
+#endif  
+
+  if (retries > 0)
+    error ("Can't send packet, found %d non-ascii characters", retries);
+
+  /* ok, try to send the packet */
+  retries = 0;
+  while (retries++ <= 10) {
+    printf_monitor ("%s", packet);
+    
+    /* read until either a timeout occurs (-2) or '+' is read */
+    while (retries <= 10) {
+      c = readchar (-timeout);
+      debuglogs (3, "Reading a GDB protocol packet... Got a '%c'\n", c);
+      switch (c) {
+      case '+':
+	debuglogs (3, "Got Ack\n");
+	return 1;
+      case SERIAL_TIMEOUT:
+	debuglogs (3, "Timed out reading serial port\n");
+	printf_monitor("+");		/* resync with the monitor */
+       expect_prompt(1);		/* See if we get a expect_prompt */   
+	break;            /* Retransmit buffer */
+      case '-':
+	debuglogs (3, "Got NAK\n");
+	printf_monitor("+");		/* resync with the monitor */
+       expect_prompt(1);		/* See if we get a expect_prompt */   
+	break;
+      case '$':
+	/* it's probably an old response, or the echo of our command.
+	 * just gobble up the packet and ignore it.
+	 */
+	debuglogs (3, "Got a junk packet\n");
+	i = 0;
+	do {
+	  c = readchar (timeout);
+	  junk[i++] = c;
+	} while (c != '#');
+	c = readchar (timeout);
+	junk[i++] = c;
+	c = readchar (timeout);
+	junk[i++] = c;
+	junk[i++] = '\0';
+	debuglogs (3, "Reading a junk packet, got a \"%s\"\n", junk);
+	continue;               /* Now, go look for next packet */
+      default:
+	continue;
+      }
+      retries++;
+      debuglogs (3, "Retransmitting packet \"%s\"\n", packet);
+      break;                /* Here to retransmit */
+    }
+  } /* outer while */
+  return 0;
+}
+
+/*
+ * array_get_packet -- get a GDB packet from the target. Basically we read till we
+ *		see a '#', then check the checksum. It returns a 1 if it's gotten a
+ *		packet, or a 0 it the packet wasn't transmitted correctly.
+ */
+static int
+array_get_packet (packet)
+     char *packet;
+{
+  int c;
+  int retries;
+  unsigned char csum;
+  unsigned char pktcsum;
+  char *bp;
+
+  csum = 0;
+  bp = packet;
+
+  memset (packet, 1, PBUFSIZ);
+  retries = 0;
+  while (retries <= 10) {
+    do {
+      c = readchar (timeout);
+      if (c == SERIAL_TIMEOUT) {
+	debuglogs (3, "array_get_packet: got time out from serial port.\n");
+      }
+      debuglogs (3, "Waiting for a '$', got a %c\n", c);
+    } while (c != '$');
+    
+    retries = 0;
+    while (retries <= 10) {
+      c = readchar (timeout);
+      debuglogs (3, "array_get_packet: got a '%c'\n", c);
+      switch (c) {
+      case SERIAL_TIMEOUT:
+	debuglogs (3, "Timeout in mid-packet, retrying\n");
+	return 0;
+      case '$':
+	debuglogs (3, "Saw new packet start in middle of old one\n");
+	return 0;             /* Start a new packet, count retries */
+      case '#':	
+	*bp = '\0';
+	pktcsum = from_hex (readchar (timeout)) << 4;
+	pktcsum |= from_hex (readchar (timeout));
+	if (csum == 0)
+	  debuglogs (3, "\nGDB packet checksum zero, must be a bogus packet\n");
+	if (csum == pktcsum) {
+	  debuglogs (3, "\nGDB packet checksum correct, packet data is \"%s\",\n", packet);
+	  printf_monitor ("+");
+	 expect_prompt (1);
+	  return 1;
+	}
+	debuglogs (3, "Bad checksum, sentsum=0x%x, csum=0x%x\n", pktcsum, csum);
+	return 0;
+      case '*':               /* Run length encoding */
+	debuglogs (5, "Run length encoding in packet\n");
+	csum += c;
+	c = readchar (timeout);
+	csum += c;
+	c = c - ' ' + 3;      /* Compute repeat count */
+	
+	if (c > 0 && c < 255 && bp + c - 1 < packet + PBUFSIZ - 1) {
+	  memset (bp, *(bp - 1), c);
+	  bp += c;
+	  continue;
+	}
+	*bp = '\0';
+	printf_filtered ("Repeat count %d too large for buffer.\n", c);
+	return 0;
+	
+      default:
+	if ((!isxdigit(c)) && (!ispunct(c)))
+	  debuglogs (4, "Got a non-ascii digit \'%c\'.\\n", c);
+	if (bp < packet + PBUFSIZ - 1) {
+	  *bp++ = c;
+	  csum += c;
+	  continue;
+	}
+	
+	*bp = '\0';
+	puts_filtered ("Remote packet too long.\n");
+	return 0;
+      }
+    }
+  }
+}
+
+/*
+ * ascii2hexword -- convert an ascii number represented by 8 digits to a hex value.
+ */
+static unsigned long
+ascii2hexword (mem)
+     unsigned char *mem;
+{
+  unsigned long val;
+  int i;
+  char buf[9];
+
+  val = 0;
+  for (i = 0; i < 8; i++) {
+    val <<= 4;
+    if (mem[i] >= 'A' && mem[i] <= 'F')
+      val = val + mem[i] - 'A' + 10;      
+    if (mem[i] >= 'a' && mem[i] <= 'f')
+      val = val + mem[i] - 'a' + 10;
+    if (mem[i] >= '0' && mem[i] <= '9')
+      val = val + mem[i] - '0';
+    buf[i] = mem[i];
+  }
+  buf[8] = '\0';
+  debuglogs (4, "ascii2hexword() got a 0x%x from %s(%x).\n", val, buf, mem);
+  return val;
+}
+
+/*
+ * ascii2hexword -- convert a hex value to an ascii number represented by 8
+ *	digits.
+ */
+static char*
+hexword2ascii (mem, num)
+     unsigned char *mem;
+     unsigned long num;
+{
+  int i;
+  unsigned char ch;
+  
+  debuglogs (4, "hexword2ascii() converting %x ", num);
+  for (i = 7; i >= 0; i--) {    
+    mem[i] = tohex ((num >> 4) & 0xf);
+    mem[i] = tohex (num & 0xf);
+    num = num >> 4;
+  }
+  mem[8] = '\0';
+  debuglogs (4, "\tto a %s", mem);
+}
+
+/* Convert hex digit A to a number.  */
+static int
+from_hex (a)
+     int a;
+{  
+  if (a == 0)
+    return 0;
+
+  debuglogs (4, "from_hex got a 0x%x(%c)\n",a,a);
+  if (a >= '0' && a <= '9')
+    return a - '0';
+  if (a >= 'a' && a <= 'f')
+    return a - 'a' + 10;
+  if (a >= 'A' && a <= 'F')
+    return a - 'A' + 10;
+  else {
+    error ("Reply contains invalid hex digit 0x%x", 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;
+}
+
+/*
+ * _initialize_remote_monitors -- setup a few addtitional commands that
+ *		are usually only used by monitors.
+ */
+void
+_initialize_remote_monitors ()
+{
+  /* generic monitor command */
+  add_com ("monitor", class_obscure, monitor_command,
+	   "Send a command to the debug monitor."); 
+
+}
+
+/*
+ * _initialize_array -- do any special init stuff for the target.
+ */
+void
+_initialize_array ()
+{
+  add_target (&array_ops);
+  baud_rate = 4800;			/* this is the only supported baud rate */
+}
+