Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 1673 insertions, 0 deletions

diff --git a/gdb/remote-mm.c b/gdb/remote-mm.c
new file mode 100644
index 0000000..19455b4
--- /dev/null
+++ b/gdb/remote-mm.c
@@ -0,0 +1,1673 @@
+/* Remote debugging interface for Am290*0 running MiniMON monitor, for GDB.
+   Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
+   Originally written by Daniel Mann at AMD.
+
+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 ecpects MiniMON to be running on the Am29000 
+   target hardware.
+ - David Wood (wood@lab.ultra.nyu.edu) at New York University adapted this
+	file to gdb 3.95.  I was unable to get this working on sun3os4
+	with termio, only with sgtty.  Because we are only attempting to
+	use this module to debug our kernel, which is already loaded when
+	gdb is started up, I did not code up the file downloading facilities.  
+	As a result this module has only the stubs to download files. 
+	You should get tagged at compile time if you need to make any 
+	changes/additions.  */
+ 
+#include "defs.h"
+#include "inferior.h"
+#include "wait.h"
+#include "value.h"
+#include <ctype.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <errno.h>
+#include "gdb_string.h"
+#include "terminal.h"
+#include "minimon.h"
+#include "target.h"
+
+/* Offset of member MEMBER in a struct of type TYPE.  */
+#define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
+
+#define DRAIN_INPUT()	(msg_recv_serial((union msg_t*)0))
+
+extern int stop_soon_quietly;           /* for wait_for_inferior */
+
+static void mm_resume();
+static void mm_fetch_registers ();
+static int fetch_register ();
+static void mm_store_registers ();
+static int store_register ();
+static int regnum_to_srnum();
+static void  mm_close ();
+static char* msg_str();
+static char* error_msg_str();
+static int expect_msg();
+static void init_target_mm();
+static int mm_memory_space();
+
+#define FREEZE_MODE     (read_register(CPS_REGNUM) && 0x400)
+#define USE_SHADOW_PC	((processor_type == a29k_freeze_mode) && FREEZE_MODE)
+
+/* FIXME: Replace with `set remotedebug'.  */
+#define LLOG_FILE "minimon.log"
+#if defined (LOG_FILE)
+FILE *log_file;
+#endif
+
+/*  
+ * Size of message buffers.  I couldn't get memory reads to work when
+ * the byte_count was larger than 512 (it may be a baud rate problem).
+ */
+#define BUFER_SIZE  512		
+/* 
+ * Size of data area in message buffer on the TARGET (remote system).
+ */
+#define MAXDATA_T  (target_config.max_msg_size - \
+			offsetof(struct write_r_msg_t,data[0]))
+/*		 
+ * Size of data area in message buffer on the HOST (gdb). 
+ */
+#define MAXDATA_H  (BUFER_SIZE - offsetof(struct write_r_msg_t,data[0]))
+/* 
+ * Defined as the minimum size of data areas of the two message buffers 
+ */
+#define MAXDATA	   (MAXDATA_H < MAXDATA_T ? MAXDATA_H : MAXDATA_T)
+
+static char out_buf[BUFER_SIZE];
+static char  in_buf[BUFER_SIZE];
+
+int msg_recv_serial();
+int msg_send_serial();
+
+#define MAX_RETRIES 5000
+extern struct target_ops mm_ops;             /* Forward declaration */
+struct config_msg_t  target_config;	/* HIF needs this */
+union msg_t  *out_msg_buf = (union msg_t*)out_buf;
+union msg_t  *in_msg_buf  = (union msg_t*)in_buf;
+
+static int timeout = 5;
+
+/* Descriptor for I/O to remote machine.  Initialize it to -1 so that
+   mm_open knows that we don't have a file open when the program
+   starts.  */
+int mm_desc = -1;
+
+/* stream which is fdopen'd from mm_desc.  Only valid when
+   mm_desc != -1.  */
+FILE *mm_stream;
+
+/* Called when SIGALRM signal sent due to alarm() timeout.  */
+#ifndef HAVE_TERMIO
+
+#ifndef __STDC__
+# ifndef volatile
+#  define volatile /**/
+# endif
+#endif
+volatile int n_alarms;
+
+static void
+mm_timer ()
+{
+#if 0
+  if (kiodebug)
+    printf ("mm_timer called\n");
+#endif
+  n_alarms++;
+}
+#endif	/* HAVE_TERMIO */
+
+/* malloc'd name of the program on the remote system.  */
+static char *prog_name = NULL;
+
+
+/* Number of SIGTRAPs we need to simulate.  That is, the next
+   NEED_ARTIFICIAL_TRAP calls to mm_wait should just return
+   SIGTRAP without actually waiting for anything.  */
+
+/**************************************************** REMOTE_CREATE_INFERIOR */
+/* This is called not only when we first attach, but also when the
+   user types "run" after having attached.  */
+static void
+mm_create_inferior (execfile, args, env)
+     char *execfile;
+     char *args;
+     char **env;
+{
+#define MAX_TOKENS 25
+#define BUFFER_SIZE 256
+   int	token_count;
+   int	result;
+   char	*token[MAX_TOKENS];
+   char	cmd_line[BUFFER_SIZE];
+
+  if (args && *args)
+    error ("Can't pass arguments to remote mm process (yet).");
+
+  if (execfile == 0 /* || exec_bfd == 0 */ )
+    error ("No executable file specified");
+
+  if (!mm_stream) {
+        printf("Minimon not open yet.\n");
+	return;
+  }
+
+  /* On ultra3 (NYU) we assume the kernel is already running so there is
+     no file to download.
+     FIXME: Fixed required here -> load your program, possibly with mm_load().
+     */
+  printf_filtered ("\n\
+Assuming you are at NYU debuging a kernel, i.e., no need to download.\n\n");
+
+  /* We will get a task spawn event immediately.  */
+  init_wait_for_inferior ();
+  clear_proceed_status ();
+  stop_soon_quietly = 1;
+  proceed (-1, TARGET_SIGNAL_DEFAULT, 0);
+  normal_stop ();
+}
+/**************************************************** REMOTE_MOURN_INFERIOR */
+static void
+mm_mourn()
+{
+        pop_target ();                /* Pop back to no-child state */
+        generic_mourn_inferior ();
+}
+
+/********************************************************************** damn_b
+*/
+/* 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
+
+static 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},
+};
+
+static 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 */
+}
+
+
+/***************************************************************** REMOTE_OPEN
+** Open a connection to remote minimon.
+   NAME is the filename used for communication, then a space,
+   then the baud rate.
+   'target adapt /dev/ttya 9600 [prognam]' for example.
+ */
+
+static char *dev_name;
+int baudrate = 9600;
+static void
+mm_open (name, from_tty)
+     char *name;
+     int from_tty;
+{
+  TERMINAL sg;
+  unsigned int prl;
+  char *p;
+
+  /* Find the first whitespace character, it separates dev_name from
+     prog_name.  */
+  for (p = name;
+       p && *p && !isspace (*p); p++)
+    ;
+  if (p == 0 || *p == '\0')
+erroid:
+    error ("Usage : <command> <serial-device> <baud-rate> [progname]");
+  dev_name = (char*)xmalloc (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));
+
+
+  if (mm_desc >= 0)
+    close (mm_desc);
+
+  mm_desc = open (dev_name, O_RDWR);
+  if (mm_desc < 0)
+    perror_with_name (dev_name);
+  ioctl (mm_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;
+  sg.sg_flags |= ANYP;
+  sg.sg_flags &= ~ECHO;
+#endif
+
+
+  ioctl (mm_desc, TIOCSETP, &sg);
+  mm_stream = fdopen (mm_desc, "r+");
+
+  push_target (&mm_ops);
+
+#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 ("mm_open: error in siginterrupt");
+#endif
+
+  /* Set up read timeout timer.  */
+  if ((void (*)) signal (SIGALRM, mm_timer) == (void (*)) -1)
+    perror ("mm_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
+   /*
+   ** Initialize target configuration structure (global)
+   */
+   DRAIN_INPUT();
+   out_msg_buf->config_req_msg.code = CONFIG_REQ;
+   out_msg_buf->config_req_msg.length = 4*0;
+   msg_send_serial(out_msg_buf); /* send config request message */
+
+   expect_msg(CONFIG,in_msg_buf,1);
+
+  a29k_get_processor_type ();
+
+  /* Print out some stuff, letting the user now what's going on */
+  printf_filtered("Connected to MiniMon via %s.\n", dev_name);
+    /* FIXME: can this restriction be removed? */
+  printf_filtered("Remote debugging using virtual addresses works only\n");
+  printf_filtered("\twhen virtual addresses map 1:1 to physical addresses.\n")
+;
+  if (processor_type != a29k_freeze_mode) {
+        fprintf_filtered(gdb_stderr,
+        "Freeze-mode debugging not available, and can only be done on an A29050.\n");
+  }
+
+   target_config.code = CONFIG;
+   target_config.length = 0;
+   target_config.processor_id = in_msg_buf->config_msg.processor_id;
+   target_config.version = in_msg_buf->config_msg.version;
+   target_config.I_mem_start = in_msg_buf->config_msg.I_mem_start;
+   target_config.I_mem_size = in_msg_buf->config_msg.I_mem_size;
+   target_config.D_mem_start = in_msg_buf->config_msg.D_mem_start;
+   target_config.D_mem_size = in_msg_buf->config_msg.D_mem_size;
+   target_config.ROM_start = in_msg_buf->config_msg.ROM_start;
+   target_config.ROM_size =  in_msg_buf->config_msg.ROM_size;
+   target_config.max_msg_size = in_msg_buf->config_msg.max_msg_size;
+   target_config.max_bkpts = in_msg_buf->config_msg.max_bkpts;
+   target_config.coprocessor = in_msg_buf->config_msg.coprocessor;
+   target_config.reserved = in_msg_buf->config_msg.reserved;
+   if (from_tty) {
+   	printf("Connected to MiniMON :\n");
+	printf("    Debugcore version            %d.%d\n",
+		0x0f & (target_config.version >> 4),
+		0x0f & (target_config.version ) );
+	printf("    Configuration version        %d.%d\n",
+		0x0f & (target_config.version >> 12),
+		0x0f & (target_config.version >>  8) );
+	printf("    Message system version       %d.%d\n",
+		0x0f & (target_config.version >> 20),
+		0x0f & (target_config.version >> 16) );
+	printf("    Communication driver version %d.%d\n",
+		0x0f & (target_config.version >> 28),
+		0x0f & (target_config.version >> 24) );
+   }
+
+  /* Leave the target running... 
+   * The above message stopped the target in the dbg core (MiniMon),  
+   * so restart the target out of MiniMon, 
+   */
+  out_msg_buf->go_msg.code = GO;
+  out_msg_buf->go_msg.length = 0;
+  msg_send_serial(out_msg_buf);
+  /* No message to expect after a GO */
+}
+
+/**************************************************************** REMOTE_CLOSE
+** Close the open connection to the minimon debugger.
+   Use this when you want to detach and do something else
+   with your gdb.  */
+static void
+mm_close (quitting)	/*FIXME: how is quitting used */
+     int quitting;
+{
+  if (mm_desc < 0)
+    error ("Can't close remote connection: not debugging remotely.");
+
+  /* We should never get here if there isn't something valid in
+     mm_desc and mm_stream.  
+
+     Due to a bug in Unix, fclose closes not only the stdio stream,
+     but also the file descriptor.  So we don't actually close
+     mm_desc.  */
+  DRAIN_INPUT();
+  fclose (mm_stream);	
+  /* close (mm_desc); */
+
+  /* Do not try to close mm_desc again, later in the program.  */
+  mm_stream = NULL;
+  mm_desc = -1;
+
+#if defined (LOG_FILE)
+  if (ferror (log_file))
+    printf ("Error writing log file.\n");
+  if (fclose (log_file) != 0)
+    printf ("Error closing log file.\n");
+#endif
+
+  printf ("Ending remote debugging\n");
+} 
+
+/************************************************************* REMOTE_ATACH */
+/* Attach to a program that is already loaded and running 
+ * Upon exiting the process's execution is stopped.
+ */
+static void
+mm_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+
+  if (!mm_stream)
+      error ("MiniMon not opened yet, use the 'target minimon' command.\n");
+	
+  if (from_tty)
+      printf ("Attaching to remote program %s...\n", prog_name);
+
+  /* Make sure the target is currently running, it is supposed to be. */
+  /* FIXME: is it ok to send MiniMon a BREAK if it is already stopped in 
+   * 	the dbg core.  If so, we don't need to send this GO.
+   */
+  out_msg_buf->go_msg.code = GO;
+  out_msg_buf->go_msg.length = 0;
+  msg_send_serial(out_msg_buf);
+  sleep(2);	/* At the worst it will stop, receive a message, continue */
+ 
+  /* Send the mm a break. */ 
+  out_msg_buf->break_msg.code = BREAK;
+  out_msg_buf->break_msg.length = 0;
+  msg_send_serial(out_msg_buf);
+}
+/********************************************************** REMOTE_DETACH */
+/* Terminate the open connection to the remote debugger.
+   Use this when you want to detach and do something else
+   with your gdb.  Leave remote process running (with no breakpoints set). */
+static void
+mm_detach (args,from_tty)
+     char *args;
+     int from_tty;
+{
+  remove_breakpoints();		/* Just in case there were any left in */
+  out_msg_buf->go_msg.code = GO;
+  out_msg_buf->go_msg.length = 0;
+  msg_send_serial(out_msg_buf);
+  pop_target();         	/* calls mm_close to do the real work */
+}
+
+
+/*************************************************************** REMOTE_RESUME
+** Tell the remote machine to resume.  */
+
+static void
+mm_resume (pid, step, sig)
+     int pid, step;
+     enum target_signal sig;
+{
+  if (sig != TARGET_SIGNAL_0)
+    warning ("Can't send signals to a remote MiniMon system.");
+
+  if (step) {
+      out_msg_buf->step_msg.code= STEP;
+      out_msg_buf->step_msg.length = 1*4;
+      out_msg_buf->step_msg.count = 1;		/* step 1 instruction */
+      msg_send_serial(out_msg_buf);
+  } else {
+      out_msg_buf->go_msg.code= GO;
+      out_msg_buf->go_msg.length = 0;
+      msg_send_serial(out_msg_buf);
+  }
+}
+
+/***************************************************************** REMOTE_WAIT
+** Wait until the remote machine stops, then return,
+   storing status in STATUS just as `wait' would.  */
+
+static int
+mm_wait (status)
+     struct target_waitstatus *status;
+{
+  int i, result;
+  int old_timeout = timeout;
+  int old_immediate_quit = immediate_quit;
+
+  status->kind = TARGET_WAITKIND_EXITED;
+  status->value.integer = 0;
+
+/* wait for message to arrive. It should be:
+	- A HIF service request.
+	- A HIF exit service request.
+	- A CHANNEL0_ACK.
+	- A CHANNEL1 request.
+	- a debugcore HALT message.
+  HIF services must be responded too, and while-looping continued.
+  If the target stops executing, mm_wait() should return.
+*/
+  timeout = 0;	/* Wait indefinetly for a message */
+  immediate_quit = 1;   /* Helps ability to QUIT */
+  while(1)
+  {
+    while(msg_recv_serial(in_msg_buf)) {
+    	QUIT;	/* Let user quit if they want */
+    }
+    switch (in_msg_buf->halt_msg.code)
+    {
+    case HIF_CALL:
+	i = in_msg_buf->hif_call_rtn_msg.service_number;
+	result=service_HIF(in_msg_buf);
+   	if(i == 1) /* EXIT */
+	    goto exit;
+	if(result)
+	    printf("Warning: failure during HIF service %d\n", i);
+	break;
+    case CHANNEL0_ACK:
+	service_HIF(in_msg_buf);
+	break;
+    case CHANNEL1:
+        i=in_msg_buf->channel1_msg.length;
+        in_msg_buf->channel1_msg.data[i] = '\0';
+        printf("%s", in_msg_buf->channel1_msg.data);
+	gdb_flush(gdb_stdout);
+        /* Send CHANNEL1_ACK message */
+        out_msg_buf->channel1_ack_msg.code = CHANNEL1_ACK;
+        out_msg_buf->channel1_ack_msg.length = 0;
+        result = msg_send_serial(out_msg_buf);
+	break;
+    case HALT:
+	goto halted;
+    default:
+	goto halted;
+    }
+  }
+halted:
+  /* FIXME, these printfs should not be here.  This is a source level 
+     debugger, guys!  */
+  if (in_msg_buf->halt_msg.trap_number== 0)
+  { printf("Am290*0 received vector number %d (break point)\n",
+	in_msg_buf->halt_msg.trap_number);
+    status->kind = TARGET_WAITKIND_STOPPED;
+    status->value.sig = TARGET_SIGNAL_TRAP;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 1)
+    {
+      printf("Am290*0 received vector number %d\n",
+	     in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_BUS;
+    }
+  else if (in_msg_buf->halt_msg.trap_number== 3
+        || in_msg_buf->halt_msg.trap_number== 4)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_FPE;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 5)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_ILL;
+  }
+  else if (in_msg_buf->halt_msg.trap_number >= 6
+        && in_msg_buf->halt_msg.trap_number <= 11)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_SEGV;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 12
+        || in_msg_buf->halt_msg.trap_number== 13)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_ILL;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 14)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_ALRM;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 15)
+    {
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_TRAP;
+    }
+  else if (in_msg_buf->halt_msg.trap_number >= 16
+        && in_msg_buf->halt_msg.trap_number <= 21)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_INT;
+  }
+  else if (in_msg_buf->halt_msg.trap_number== 22)
+  { printf("Am290*0 received vector number %d\n",
+	in_msg_buf->halt_msg.trap_number);
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_ILL;
+  } /* BREAK message was sent */
+  else if (in_msg_buf->halt_msg.trap_number== 75)
+    {
+      status->kind = TARGET_WAITKIND_STOPPED;
+      status->value.sig = TARGET_SIGNAL_TRAP;
+    }
+  else
+exit:
+    {
+      status->kind = TARGET_WAITKIND_EXITED;
+      status->value.integer = 0;
+    }
+
+  timeout = old_timeout;	/* Restore original timeout value */
+  immediate_quit = old_immediate_quit;
+  return 0;
+}
+
+/******************************************************* REMOTE_FETCH_REGISTERS
+ * Read a remote register 'regno'. 
+ * If regno==-1 then read all the registers.
+ */
+static void 
+mm_fetch_registers (regno)
+int	regno;
+{
+  INT32 *data_p;
+
+  if (regno >= 0)  {
+	fetch_register(regno);
+	return;
+  }
+
+/* Gr1/rsp */
+  out_msg_buf->read_req_msg.byte_count = 4*1;
+  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+  out_msg_buf->read_req_msg.address = 1;
+  msg_send_serial(out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+  supply_register (GR1_REGNUM , data_p);
+
+#if defined(GR64_REGNUM)	/* Read gr64-127 */
+/* Global Registers gr64-gr95 */ 
+  out_msg_buf->read_req_msg.code= READ_REQ;
+  out_msg_buf->read_req_msg.length = 4*3;
+  out_msg_buf->read_req_msg.byte_count = 4*32;
+  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+  out_msg_buf->read_req_msg.address = 64;
+  msg_send_serial(out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+
+  for (regno=GR64_REGNUM; regno<GR64_REGNUM+32; regno++) {
+      supply_register (regno, data_p++);
+  }
+#endif	/*  GR64_REGNUM */
+
+/* Global Registers gr96-gr127 */ 
+  out_msg_buf->read_req_msg.code= READ_REQ;
+  out_msg_buf->read_req_msg.length = 4*3;
+  out_msg_buf->read_req_msg.byte_count = 4 * 32;
+  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+  out_msg_buf->read_req_msg.address = 96;
+  msg_send_serial(out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+
+  for (regno=GR96_REGNUM; regno<GR96_REGNUM+32; regno++) {
+      supply_register (regno, data_p++);
+  }
+
+/* Local Registers */ 
+  out_msg_buf->read_req_msg.byte_count = 4 * (128);
+  out_msg_buf->read_req_msg.memory_space = LOCAL_REG;
+  out_msg_buf->read_req_msg.address = 0;
+  msg_send_serial(out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+
+  for (regno=LR0_REGNUM; regno<LR0_REGNUM+128; regno++) {
+      supply_register (regno, data_p++);
+  }
+
+/* Protected Special Registers */ 
+  out_msg_buf->read_req_msg.byte_count = 4*15;
+  out_msg_buf->read_req_msg.memory_space = SPECIAL_REG;
+  out_msg_buf->read_req_msg.address = 0;
+  msg_send_serial( out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+
+  for (regno=0; regno<=14; regno++) {
+      supply_register (SR_REGNUM(regno), data_p++);
+  }
+  if (USE_SHADOW_PC) {	/* Let regno_to_srnum() handle the register number */
+	fetch_register(NPC_REGNUM);
+	fetch_register(PC_REGNUM);
+	fetch_register(PC2_REGNUM);
+  }
+
+/* Unprotected Special Registers */ 
+  out_msg_buf->read_req_msg.byte_count = 4*8;
+  out_msg_buf->read_req_msg.memory_space = SPECIAL_REG;
+  out_msg_buf->read_req_msg.address = 128;
+  msg_send_serial( out_msg_buf);
+  expect_msg(READ_ACK,in_msg_buf,1);
+  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
+
+  for (regno=128; regno<=135; regno++) {
+      supply_register (SR_REGNUM(regno), data_p++);
+  }
+
+  /* There doesn't seem to be any way to get these.  */
+  {
+    int val = -1;
+    supply_register (FPE_REGNUM, &val);
+    supply_register (INTE_REGNUM, &val);
+    supply_register (FPS_REGNUM, &val);
+    supply_register (EXO_REGNUM, &val);
+  }
+}
+
+
+/****************************************************** REMOTE_STORE_REGISTERS
+ * Store register regno into the target.  
+ * If regno==-1 then store all the registers.
+ * Result is 0 for success, -1 for failure.
+ */
+
+static void
+mm_store_registers (regno)
+int regno;
+{
+  int result;
+  
+  if (regno >= 0) {
+    store_register(regno);
+    return;
+  }
+
+  result = 0;
+
+  out_msg_buf->write_r_msg.code= WRITE_REQ;
+
+/* Gr1/rsp */
+  out_msg_buf->write_r_msg.byte_count = 4*1;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.memory_space = GLOBAL_REG;
+  out_msg_buf->write_r_msg.address = 1;
+  out_msg_buf->write_r_msg.data[0] = read_register (GR1_REGNUM);
+
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+#if defined(GR64_REGNUM)
+/* Global registers gr64-gr95 */
+  out_msg_buf->write_r_msg.byte_count = 4* (32);
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 64;
+
+  for (regno=GR64_REGNUM ; regno<GR64_REGNUM+32 ; regno++)
+    {
+      out_msg_buf->write_r_msg.data[regno-GR64_REGNUM] = read_register (regno);
+    }
+  msg_send_serial(out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+#endif	/* GR64_REGNUM */
+
+/* Global registers gr96-gr127 */
+  out_msg_buf->write_r_msg.byte_count = 4* (32);
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 96;
+  for (regno=GR96_REGNUM ; regno<GR96_REGNUM+32 ; regno++)
+    {
+      out_msg_buf->write_r_msg.data[regno-GR96_REGNUM] = read_register (regno);
+    }
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+/* Local Registers */
+  out_msg_buf->write_r_msg.memory_space = LOCAL_REG;
+  out_msg_buf->write_r_msg.byte_count = 4*128;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 0;
+
+  for (regno = LR0_REGNUM ; regno < LR0_REGNUM+128 ; regno++)
+    {
+      out_msg_buf->write_r_msg.data[regno-LR0_REGNUM] = read_register (regno);
+    }
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+/* Protected Special Registers */ 
+  /* VAB through TMR */
+  out_msg_buf->write_r_msg.memory_space = SPECIAL_REG;
+  out_msg_buf->write_r_msg.byte_count = 4* 10;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 0;
+  for (regno = 0 ; regno<=9 ; regno++)	/* VAB through TMR */
+    out_msg_buf->write_r_msg.data[regno] = read_register (SR_REGNUM(regno));
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+  /* PC0, PC1, PC2 possibly as shadow registers */
+  out_msg_buf->write_r_msg.byte_count = 4* 3;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  for (regno=10 ; regno<=12 ; regno++)	/* LRU and MMU */
+    out_msg_buf->write_r_msg.data[regno-10] = read_register (SR_REGNUM(regno));
+  if (USE_SHADOW_PC) 
+    out_msg_buf->write_r_msg.address = 20;	/* SPC0 */
+  else 
+    out_msg_buf->write_r_msg.address = 10;	/* PC0 */
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+  /* LRU and MMU */
+  out_msg_buf->write_r_msg.byte_count = 4* 2;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 13;
+  for (regno=13 ; regno<=14 ; regno++)	/* LRU and MMU */
+    out_msg_buf->write_r_msg.data[regno-13] = read_register (SR_REGNUM(regno));
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+
+/* Unprotected Special Registers */ 
+  out_msg_buf->write_r_msg.byte_count = 4*8;
+  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
+  out_msg_buf->write_r_msg.address = 128;
+  for (regno = 128 ; regno<=135 ; regno++)
+    out_msg_buf->write_r_msg.data[regno-128] = read_register(SR_REGNUM(regno));
+  msg_send_serial( out_msg_buf);
+  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = -1;
+  }
+ 
+  registers_changed ();
+}
+
+/*************************************************** REMOTE_PREPARE_TO_STORE */
+/* 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
+mm_prepare_to_store ()
+{
+  /* Do nothing, since we can store individual regs */
+}
+
+/******************************************************* REMOTE_XFER_MEMORY */
+static CORE_ADDR
+translate_addr(addr)
+CORE_ADDR addr;
+{
+#if defined(KERNEL_DEBUGGING)
+        /* Check for a virtual address in the kernel */
+        /* Assume physical address of ublock is in  paddr_u register */
+	/* FIXME: doesn't work for user virtual addresses */
+        if (addr >= UVADDR) {
+                /* PADDR_U register holds the physical address of the ublock */
+                CORE_ADDR i = (CORE_ADDR)read_register(PADDR_U_REGNUM);
+                return(i + addr - (CORE_ADDR)UVADDR);
+        } else {
+        	return(addr);
+        }
+#else
+        return(addr);
+#endif
+}
+
+/******************************************************* REMOTE_FILES_INFO */
+static void
+mm_files_info ()
+{
+  printf ("\tAttached to %s at %d baud and running program %s.\n",
+          dev_name, baudrate, prog_name);
+}
+
+/************************************************* REMOTE_INSERT_BREAKPOINT */
+static int
+mm_insert_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  out_msg_buf->bkpt_set_msg.code = BKPT_SET;
+  out_msg_buf->bkpt_set_msg.length = 4*4;
+  out_msg_buf->bkpt_set_msg.memory_space = I_MEM;
+  out_msg_buf->bkpt_set_msg.bkpt_addr = (ADDR32) addr;
+  out_msg_buf->bkpt_set_msg.pass_count = 1;
+  out_msg_buf->bkpt_set_msg.bkpt_type = -1;	/* use illop for 29000 */
+  msg_send_serial( out_msg_buf);
+  if (expect_msg(BKPT_SET_ACK,in_msg_buf,1)) {
+	return 0;		/* Success */
+  } else {
+	return 1;		/* Failure */
+  }
+}
+
+/************************************************* REMOTE_DELETE_BREAKPOINT */
+static int
+mm_remove_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  out_msg_buf->bkpt_rm_msg.code = BKPT_RM;
+  out_msg_buf->bkpt_rm_msg.length = 4*3;
+  out_msg_buf->bkpt_rm_msg.memory_space = I_MEM;
+  out_msg_buf->bkpt_rm_msg.bkpt_addr = (ADDR32) addr;
+  msg_send_serial( out_msg_buf);
+  if (expect_msg(BKPT_RM_ACK,in_msg_buf,1)) {
+	return 0;		/* Success */
+  } else {
+	return 1;		/* Failure */
+  }
+}
+
+
+/******************************************************* REMOTE_KILL */
+static void
+mm_kill(arg,from_tty)
+char    *arg;
+int     from_tty;
+{
+	char	buf[4];
+
+#if defined(KERNEL_DEBUGGING)
+	/* We don't ever kill the kernel */
+	if (from_tty) {
+		printf("Kernel not killed, but left in current state.\n");
+	 	printf("Use detach to leave kernel running.\n");
+	}
+#else
+  	out_msg_buf->break_msg.code = BREAK;
+  	out_msg_buf->bkpt_set_msg.length = 4*0;
+	expect_msg(HALT,in_msg_buf,from_tty);
+	if (from_tty) {
+		printf("Target has been stopped.");
+		printf("Would you like to do a hardware reset (y/n) [n] ");
+		fgets(buf,3,stdin);	
+		if (buf[0] == 'y') {
+			out_msg_buf->reset_msg.code = RESET;
+			out_msg_buf->bkpt_set_msg.length = 4*0;
+			expect_msg(RESET_ACK,in_msg_buf,from_tty);
+			printf("Target has been reset.");
+		}
+	}
+	pop_target();
+#endif 
+}
+
+
+
+/***************************************************************************/
+/* 
+ * Load a program into the target.
+ */
+static void
+mm_load(arg_string,from_tty)
+char	*arg_string;
+int	from_tty;
+{
+  dont_repeat ();
+
+#if defined(KERNEL_DEBUGGING)
+  printf("The kernel had better be loaded already!  Loading not done.\n");
+#else
+  if (arg_string == 0)
+    error ("The load command takes a file name");
+
+  arg_string = tilde_expand (arg_string);
+  make_cleanup (free, arg_string);
+  QUIT;
+  immediate_quit++;
+  error("File loading is not yet supported for MiniMon.");
+  /* FIXME, code to load your file here... */
+  /* You may need to do an init_target_mm() */
+  /* init_target_mm(?,?,?,?,?,?,?,?); */
+  immediate_quit--;
+  /* symbol_file_add (arg_string, from_tty, text_addr, 0, 0, 0, 0); */
+#endif
+
+}
+
+/************************************************ REMOTE_WRITE_INFERIOR_MEMORY
+** Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.  Returns number of bytes written.  */
+static int
+mm_write_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  int i,nwritten;
+
+  out_msg_buf->write_req_msg.code= WRITE_REQ;
+  out_msg_buf->write_req_msg.memory_space = mm_memory_space(memaddr);	
+
+  nwritten=0;
+  while (nwritten < len) {
+	int num_to_write = len - nwritten;
+	if (num_to_write > MAXDATA) num_to_write = MAXDATA;
+  	for (i=0 ; i < num_to_write ; i++)
+      		out_msg_buf->write_req_msg.data[i] = myaddr[i+nwritten];
+  	out_msg_buf->write_req_msg.byte_count = num_to_write;
+  	out_msg_buf->write_req_msg.length = 3*4 + num_to_write; 
+  	out_msg_buf->write_req_msg.address = memaddr + nwritten;
+  	msg_send_serial(out_msg_buf);
+
+  	if (expect_msg(WRITE_ACK,in_msg_buf,1)) {
+  		nwritten += in_msg_buf->write_ack_msg.byte_count;
+  	} else {
+		break;	
+  	}
+  }
+  return(nwritten);
+}
+
+/************************************************* REMOTE_READ_INFERIOR_MEMORY
+** Read LEN bytes from inferior memory at MEMADDR.  Put the result
+   at debugger address MYADDR.  Returns number of bytes read.  */
+static int
+mm_read_inferior_memory(memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  int i,nread;
+
+  out_msg_buf->read_req_msg.code= READ_REQ;
+  out_msg_buf->read_req_msg.memory_space = mm_memory_space(memaddr);
+
+  nread=0;
+  while (nread < len) {
+	int num_to_read = (len - nread);
+	if (num_to_read > MAXDATA) num_to_read = MAXDATA;
+  	out_msg_buf->read_req_msg.byte_count = num_to_read; 
+  	out_msg_buf->read_req_msg.length = 3*4 + num_to_read; 
+  	out_msg_buf->read_req_msg.address = memaddr + nread;
+  	msg_send_serial(out_msg_buf);
+
+  	if (expect_msg(READ_ACK,in_msg_buf,1)) {
+  		for (i=0 ; i<in_msg_buf->read_ack_msg.byte_count ; i++)
+      			myaddr[i+nread] = in_msg_buf->read_ack_msg.data[i];
+  		nread += in_msg_buf->read_ack_msg.byte_count;
+  	} else {
+		break;	
+  	}
+  }
+  return(nread);
+}
+
+/* FIXME!  Merge these two.  */
+static int
+mm_xfer_inferior_memory (memaddr, myaddr, len, write)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+{
+
+  memaddr = translate_addr(memaddr);
+
+  if (write)
+    return mm_write_inferior_memory (memaddr, myaddr, len);
+  else
+    return mm_read_inferior_memory (memaddr, myaddr, len);
+}
+
+
+/********************************************************** MSG_SEND_SERIAL
+** This function is used to send a message over the
+** serial line.
+**
+** If the message is successfully sent, a zero is
+** returned.  If the message was not sendable, a -1
+** is returned.  This function blocks.  That is, it
+** does not return until the message is completely
+** sent, or until an error is encountered.
+**
+*/
+
+int
+msg_send_serial(msg_ptr)
+   union  msg_t  *msg_ptr;
+{
+   INT32  message_size;
+   int    byte_count;
+   int    result;
+   char   c;
+
+   /* Send message header */
+   byte_count = 0;
+   message_size = msg_ptr->generic_msg.length + (2 * sizeof(INT32));
+   do {
+      c = *((char *)msg_ptr+byte_count);
+      result = write(mm_desc, &c, 1);
+      if (result == 1) {
+         byte_count = byte_count + 1;
+      }
+   } while ((byte_count < message_size) );
+
+   return(0);
+}  /* end msg_send_serial() */
+
+/********************************************************** MSG_RECV_SERIAL
+** This function is used to receive a message over a
+** serial line.
+**
+** If the message is waiting in the buffer, a zero is
+** returned and the buffer pointed to by msg_ptr is filled
+** in.  If no message was available, a -1 is returned.
+** If timeout==0, wait indefinetly for a character.
+**
+*/
+
+int
+msg_recv_serial(msg_ptr)
+union  msg_t  *msg_ptr;
+{
+   static INT32  length=0;
+   static INT32  byte_count=0;
+   int    result;
+   char   c;
+  if(msg_ptr == 0)		/* re-sync request */
+  {  length=0;
+     byte_count=0;
+#ifdef HAVE_TERMIO
+     /* The timeout here is the prevailing timeout set with VTIME */
+     ->"timeout==0 semantics not supported"
+     read(mm_desc, in_buf, BUFER_SIZE);
+#else
+     alarm (1);
+     read(mm_desc, in_buf, BUFER_SIZE);
+     alarm (0);
+#endif
+     return(0);
+  }
+   /* Receive message */
+#ifdef HAVE_TERMIO
+/* Timeout==0, help support the mm_wait() routine */
+   ->"timeout==0 semantics not supported (and its nice if they are)"
+   result = read(mm_desc, &c, 1);
+#else
+  alarm(timeout);
+  result = read(mm_desc, &c, 1);
+  alarm (0);
+#endif
+  if ( result < 0) {
+      if (errno == EINTR) {
+      	error ("Timeout reading from remote system.");
+      } else
+	perror_with_name ("remote");
+  } else if (result == 1) {
+      *((char *)msg_ptr+byte_count) = c;
+      byte_count = byte_count + 1;
+  }
+
+   /* Message header received.  Save message length. */
+  if (byte_count == (2 * sizeof(INT32)))
+      length = msg_ptr->generic_msg.length;
+
+  if (byte_count >= (length + (2 * sizeof(INT32)))) {
+      /* Message received */
+      byte_count = 0;
+      return(0);
+  } else
+      return (-1);
+
+}  /* end msg_recv_serial() */
+
+/********************************************************************* KBD_RAW
+** This function is used to put the keyboard in "raw"
+** mode for BSD Unix.  The original status is saved
+** so that it may be restored later.
+*/
+TERMINAL kbd_tbuf;
+
+int
+kbd_raw() {
+   int    result;
+   TERMINAL tbuf;
+
+   /* Get keyboard termio (to save to restore original modes) */
+#ifdef HAVE_TERMIO
+   result = ioctl(0, TCGETA, &kbd_tbuf);
+#else
+   result = ioctl(0, TIOCGETP, &kbd_tbuf);
+#endif
+   if (result == -1)
+      return (errno);
+
+   /* Get keyboard TERMINAL (for modification) */
+#ifdef HAVE_TERMIO
+   result = ioctl(0, TCGETA, &tbuf);
+#else
+   result = ioctl(0, TIOCGETP, &tbuf);
+#endif
+   if (result == -1)
+      return (errno);
+
+   /* Set up new parameters */
+#ifdef HAVE_TERMIO
+   tbuf.c_iflag = tbuf.c_iflag &
+      ~(INLCR | ICRNL | IUCLC | ISTRIP | IXON | BRKINT);
+   tbuf.c_lflag = tbuf.c_lflag & ~(ICANON | ISIG | ECHO);
+   tbuf.c_cc[4] = 0;  /* MIN */
+   tbuf.c_cc[5] = 0;  /* TIME */
+#else
+   /* FIXME: not sure if this is correct (matches HAVE_TERMIO). */
+   tbuf.sg_flags |= RAW;
+   tbuf.sg_flags |= ANYP;
+   tbuf.sg_flags &= ~ECHO;
+#endif
+
+   /* Set keyboard termio to new mode (RAW) */
+#ifdef HAVE_TERMIO
+   result = ioctl(0, TCSETAF, &tbuf);
+#else
+   result = ioctl(0, TIOCSETP, &tbuf);
+#endif 
+   if (result == -1)
+      return (errno);
+
+   return (0);
+}  /* end kbd_raw() */
+
+
+
+/***************************************************************** KBD_RESTORE
+** This function is used to put the keyboard back in the
+** mode it was in before kbk_raw was called.  Note that
+** kbk_raw() must have been called at least once before
+** kbd_restore() is called.
+*/
+
+int
+kbd_restore() {
+   int result;
+
+   /* Set keyboard termio to original mode */
+#ifdef HAVE_TERMIO
+   result = ioctl(0, TCSETAF, &kbd_tbuf);
+#else
+   result = ioctl(0, TIOCGETP, &kbd_tbuf);
+#endif
+
+   if (result == -1)
+      return (errno);
+
+   return(0);
+}  /* end kbd_cooked() */
+
+
+/*****************************************************************************/ 
+/* Fetch a single register indicatated by 'regno'. 
+ * Returns 0/-1 on success/failure.  
+ */
+static int
+fetch_register (regno)
+     int regno;
+{
+     int  result;
+  out_msg_buf->read_req_msg.code= READ_REQ;
+  out_msg_buf->read_req_msg.length = 4*3;
+  out_msg_buf->read_req_msg.byte_count = 4;
+
+  if (regno == GR1_REGNUM)
+  { out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->read_req_msg.address = 1;
+  }
+  else if (regno >= GR96_REGNUM && regno < GR96_REGNUM + 32)
+  { out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->read_req_msg.address = (regno - GR96_REGNUM) + 96;
+  }
+#if defined(GR64_REGNUM)
+  else if (regno >= GR64_REGNUM && regno < GR64_REGNUM + 32 )
+  { out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->read_req_msg.address = (regno - GR64_REGNUM) + 64;
+  }
+#endif	/* GR64_REGNUM */
+  else if (regno >= LR0_REGNUM && regno < LR0_REGNUM + 128)
+  { out_msg_buf->read_req_msg.memory_space = LOCAL_REG;
+    out_msg_buf->read_req_msg.address = (regno - LR0_REGNUM);
+  }
+  else if (regno>=FPE_REGNUM && regno<=EXO_REGNUM)  
+  { int val = -1;
+    supply_register(160 + (regno - FPE_REGNUM),&val);
+    return 0;		/* Pretend Success */
+  }
+  else 
+  { out_msg_buf->read_req_msg.memory_space = SPECIAL_REG;
+    out_msg_buf->read_req_msg.address = regnum_to_srnum(regno); 
+  } 
+
+  msg_send_serial(out_msg_buf);
+
+  if (expect_msg(READ_ACK,in_msg_buf,1)) {
+  	supply_register (regno, &(in_msg_buf->read_r_ack_msg.data[0]));
+	result = 0;
+  } else {
+	result = -1;
+  }
+  return result;
+}
+/*****************************************************************************/ 
+/* Store a single register indicated by 'regno'. 
+ * Returns 0/-1 on success/failure.  
+ */
+static int
+store_register (regno)
+     int regno;
+{
+     int  result;
+
+  out_msg_buf->write_req_msg.code= WRITE_REQ;
+  out_msg_buf->write_req_msg.length = 4*4;
+  out_msg_buf->write_req_msg.byte_count = 4;
+  out_msg_buf->write_r_msg.data[0] = read_register (regno);
+
+  if (regno == GR1_REGNUM)
+  { out_msg_buf->write_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->write_req_msg.address = 1;
+    /* 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.  
+     */
+    registers_changed ();
+  }
+#if defined(GR64_REGNUM)
+  else if (regno >= GR64_REGNUM && regno < GR64_REGNUM + 32 )
+  { out_msg_buf->write_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->write_req_msg.address = (regno - GR64_REGNUM) + 64;
+  }
+#endif	/* GR64_REGNUM */
+  else if (regno >= GR96_REGNUM && regno < GR96_REGNUM + 32)
+  { out_msg_buf->write_req_msg.memory_space = GLOBAL_REG;
+    out_msg_buf->write_req_msg.address = (regno - GR96_REGNUM) + 96;
+  }
+  else if (regno >= LR0_REGNUM && regno < LR0_REGNUM + 128)
+  { out_msg_buf->write_req_msg.memory_space = LOCAL_REG;
+    out_msg_buf->write_req_msg.address = (regno - LR0_REGNUM);
+  }
+  else if (regno>=FPE_REGNUM && regno<=EXO_REGNUM)  
+  { 
+    return 0;		/* Pretend Success */
+  }
+  else 	/* An unprotected or protected special register */
+  { out_msg_buf->write_req_msg.memory_space = SPECIAL_REG;
+    out_msg_buf->write_req_msg.address = regnum_to_srnum(regno); 
+  } 
+
+  msg_send_serial(out_msg_buf);
+
+  if (expect_msg(WRITE_ACK,in_msg_buf,1)) {
+	result = 0;
+  } else {
+	result = -1;
+  }
+  return result;
+}
+/****************************************************************************/
+/* 
+ * Convert a gdb special register number to a 29000 special register number.
+ */
+static int
+regnum_to_srnum(regno)
+int	regno;
+{
+	switch(regno) {
+		case VAB_REGNUM: return(0); 
+		case OPS_REGNUM: return(1); 
+		case CPS_REGNUM: return(2); 
+		case CFG_REGNUM: return(3); 
+		case CHA_REGNUM: return(4); 
+		case CHD_REGNUM: return(5); 
+		case CHC_REGNUM: return(6); 
+		case RBP_REGNUM: return(7); 
+		case TMC_REGNUM: return(8); 
+		case TMR_REGNUM: return(9); 
+		case NPC_REGNUM: return(USE_SHADOW_PC ? (20) : (10));
+		case PC_REGNUM:  return(USE_SHADOW_PC ? (21) : (11));
+		case PC2_REGNUM: return(USE_SHADOW_PC ? (22) : (12));
+		case MMU_REGNUM: return(13); 
+		case LRU_REGNUM: return(14); 
+		case IPC_REGNUM: return(128); 
+		case IPA_REGNUM: return(129); 
+		case IPB_REGNUM: return(130); 
+		case Q_REGNUM:   return(131); 
+		case ALU_REGNUM: return(132); 
+		case BP_REGNUM:  return(133); 
+		case FC_REGNUM:  return(134); 
+		case CR_REGNUM:  return(135); 
+		case FPE_REGNUM: return(160); 
+		case INTE_REGNUM: return(161); 
+		case FPS_REGNUM: return(162); 
+		case EXO_REGNUM:return(164); 
+		default:
+			return(255);	/* Failure ? */
+	}
+}
+/****************************************************************************/
+/* 
+ * Initialize the target debugger (minimon only).
+ */
+static void
+init_target_mm(tstart,tend,dstart,dend,entry,ms_size,rs_size,arg_start)
+ADDR32	tstart,tend,dstart,dend,entry;
+INT32	ms_size,rs_size;
+ADDR32	arg_start;
+{
+	out_msg_buf->init_msg.code = INIT;
+	out_msg_buf->init_msg.length= sizeof(struct init_msg_t)-2*sizeof(INT32);
+	out_msg_buf->init_msg.text_start = tstart;
+	out_msg_buf->init_msg.text_end = tend;
+	out_msg_buf->init_msg.data_start = dstart;
+	out_msg_buf->init_msg.data_end = dend;
+	out_msg_buf->init_msg.entry_point = entry;
+	out_msg_buf->init_msg.mem_stack_size = ms_size;
+	out_msg_buf->init_msg.reg_stack_size = rs_size;
+	out_msg_buf->init_msg.arg_start = arg_start;
+	msg_send_serial(out_msg_buf);
+	expect_msg(INIT_ACK,in_msg_buf,1);
+}
+/****************************************************************************/
+/* 
+ * Return a pointer to a string representing the given message code.
+ * Not all messages are represented here, only the ones that we expect
+ * to be called with.
+ */
+static char*
+msg_str(code)
+INT32	code;
+{
+	static char cbuf[32];
+
+	switch (code) {
+	case BKPT_SET_ACK: sprintf(cbuf,"%s (%d)","BKPT_SET_ACK",code); break; 
+	case BKPT_RM_ACK: sprintf(cbuf,"%s (%d)","BKPT_RM_ACK",code); break; 
+	case INIT_ACK: 	  sprintf(cbuf,"%s (%d)","INIT_ACK",code); break; 
+	case READ_ACK: 	  sprintf(cbuf,"%s (%d)","READ_ACK",code); break; 
+	case WRITE_ACK:	  sprintf(cbuf,"%s (%d)","WRITE_ACK",code); break; 
+	case ERROR:       sprintf(cbuf,"%s (%d)","ERROR",code); break; 
+	case HALT: 	sprintf(cbuf,"%s (%d)","HALT",code); break; 
+	default:	sprintf(cbuf,"UNKNOWN (%d)",code); break; 
+	}
+	return(cbuf);
+}
+/****************************************************************************/
+/*
+ * Selected (not all of them) error codes that we might get.
+ */
+static char* 
+error_msg_str(code)
+INT32	code;
+{
+	static char cbuf[50];
+
+	switch (code) {
+	case EMFAIL: 	return("EMFAIL: unrecoverable error"); 
+	case EMBADADDR: return("EMBADADDR: Illegal address"); 
+	case EMBADREG: 	return("EMBADREG: Illegal register "); 
+	case EMACCESS: 	return("EMACCESS: Could not access memory");
+	case EMBADMSG: 	return("EMBADMSG: Unknown message type"); 
+	case EMMSG2BIG: return("EMMSG2BIG: Message to large"); 
+	case EMNOSEND: 	return("EMNOSEND: Could not send message"); 
+	case EMNORECV: 	return("EMNORECV: Could not recv message"); 
+	case EMRESET: 	return("EMRESET: Could not RESET target"); 
+	case EMCONFIG: 	return("EMCONFIG: Could not get target CONFIG"); 
+	case EMSTATUS: 	return("EMSTATUS: Could not get target STATUS"); 
+	case EMREAD: 	return("EMREAD: Could not READ target memory"); 
+	case EMWRITE: 	return("EMWRITE: Could not WRITE target memory"); 
+	case EMBKPTSET: return("EMBKPTSET: Could not set breakpoint"); 
+	case EMBKPTRM:	return("EMBKPTRM: Could not remove breakpoint"); 
+	case EMBKPTSTAT:return("EMBKPTSTAT: Could not get breakpoint status"); 
+	case EMBKPTNONE:return("EMBKPTNONE: All breakpoints in use"); 
+	case EMBKPTUSED:return("EMBKPTUSED: Breakpoints already in use"); 
+	case EMINIT: 	return("EMINIT: Could not init target memory"); 
+	case EMGO: 	return("EMGO: Could not start execution"); 
+	case EMSTEP: 	return("EMSTEP: Could not single step"); 
+	case EMBREAK: 	return("EMBREAK: Could not BREAK"); 
+	case EMCOMMERR: return("EMCOMMERR: Communication error"); 
+	default:     	sprintf(cbuf,"error number %d",code); break;
+	} /* end switch */
+
+	return (cbuf);
+}
+/****************************************************************************/
+/* 
+ *  Receive a message and expect it to be of type msgcode.
+ *  Returns 0/1 on failure/success.
+ */
+static int
+expect_msg(msgcode,msg_buf,from_tty)
+INT32	msgcode;		/* Msg code we expect */
+union msg_t *msg_buf;		/* Where to put  the message received */
+int	from_tty;		/* Print message on error if non-zero */
+{
+  int	retries=0;
+  while(msg_recv_serial(msg_buf) && (retries++<MAX_RETRIES)); 
+  if (retries >= MAX_RETRIES) {
+	printf("Expected msg %s, ",msg_str(msgcode));
+	printf("no message received!\n");
+        return(0);		/* Failure */
+  }
+
+  if (msg_buf->generic_msg.code != msgcode) {
+     if (from_tty) {
+	printf("Expected msg %s, ",msg_str(msgcode));
+	printf("got msg %s\n",msg_str(msg_buf->generic_msg.code));
+        if (msg_buf->generic_msg.code == ERROR) 
+		printf("%s\n",error_msg_str(msg_buf->error_msg.error_code));
+     }
+     return(0);			/* Failure */
+  }
+  return(1);			/* Success */
+}	
+/****************************************************************************/
+/*
+ * Determine the MiniMon memory space qualifier based on the addr. 
+ * FIXME: Can't distinguis I_ROM/D_ROM.  
+ * FIXME: Doesn't know anything about I_CACHE/D_CACHE.
+ */
+static int
+mm_memory_space(addr)
+CORE_ADDR	*addr;
+{
+	ADDR32 tstart = target_config.I_mem_start;
+	ADDR32 tend   = tstart + target_config.I_mem_size;  
+	ADDR32 dstart = target_config.D_mem_start;
+	ADDR32 dend   = tstart + target_config.D_mem_size;  
+	ADDR32 rstart = target_config.ROM_start;
+	ADDR32 rend   = tstart + target_config.ROM_size;  
+
+	if (((ADDR32)addr >= tstart) && ((ADDR32)addr < tend)) { 
+		return I_MEM;
+	} else if (((ADDR32)addr >= dstart) && ((ADDR32)addr < dend)) { 
+		return D_MEM;
+	} else if (((ADDR32)addr >= rstart) && ((ADDR32)addr < rend)) {
+		/* FIXME: how do we determine between D_ROM and I_ROM */
+		return D_ROM;
+	} else	/* FIXME: what do me do now? */
+		return D_MEM;	/* Hmmm! */
+}
+
+/****************************************************************************/
+/* 
+ *  Define the target subroutine names
+ */
+struct target_ops mm_ops ;
+
+static void 
+init_mm_ops(void)
+{
+  mm_ops.to_shortname =   "minimon";
+  mm_ops.to_longname =   "Remote AMD/Minimon target";
+  mm_ops.to_doc =   "Remote debug an AMD 290*0 using the MiniMon dbg core on the target";
+  mm_ops.to_open =   mm_open;
+  mm_ops.to_close =   mm_close;
+  mm_ops.to_attach =   mm_attach;
+  mm_ops.to_post_attach = NULL;
+  mm_ops.to_require_attach = NULL;
+  mm_ops.to_detach =   mm_detach;
+  mm_ops.to_require_detach = NULL;
+  mm_ops.to_resume =   mm_resume;
+  mm_ops.to_wait  =   mm_wait;
+  mm_ops.to_post_wait = NULL;
+  mm_ops.to_fetch_registers  =   mm_fetch_registers;
+  mm_ops.to_store_registers  =   mm_store_registers;
+  mm_ops.to_prepare_to_store =   mm_prepare_to_store;
+  mm_ops.to_xfer_memory  =   mm_xfer_inferior_memory;
+  mm_ops.to_files_info  =   mm_files_info;
+  mm_ops.to_insert_breakpoint =   mm_insert_breakpoint;
+  mm_ops.to_remove_breakpoint =   mm_remove_breakpoint;
+  mm_ops.to_terminal_init  =   0;
+  mm_ops.to_terminal_inferior =   0;
+  mm_ops.to_terminal_ours_for_output =   0;
+  mm_ops.to_terminal_ours  =   0;
+  mm_ops.to_terminal_info  =   0;        
+  mm_ops.to_kill  =   mm_kill;           
+  mm_ops.to_load  =   mm_load;
+  mm_ops.to_lookup_symbol =   0;           
+  mm_ops.to_create_inferior =   mm_create_inferior;
+  mm_ops.to_post_startup_inferior = NULL;
+  mm_ops.to_acknowledge_created_inferior = NULL;
+  mm_ops.to_clone_and_follow_inferior = NULL;
+  mm_ops.to_post_follow_inferior_by_clone = NULL;
+  mm_ops.to_insert_fork_catchpoint = NULL;
+  mm_ops.to_remove_fork_catchpoint = NULL;
+  mm_ops.to_insert_vfork_catchpoint = NULL;
+  mm_ops.to_remove_vfork_catchpoint = NULL;
+  mm_ops.to_has_forked = NULL;
+  mm_ops.to_has_vforked = NULL;
+  mm_ops.to_can_follow_vfork_prior_to_exec = NULL;
+  mm_ops.to_post_follow_vfork = NULL; 
+  mm_ops.to_insert_exec_catchpoint = NULL;
+  mm_ops.to_remove_exec_catchpoint = NULL;
+  mm_ops.to_has_execd = NULL;
+  mm_ops.to_reported_exec_events_per_exec_call = NULL;
+  mm_ops.to_has_exited = NULL;
+  mm_ops.to_mourn_inferior =   mm_mourn; 
+  mm_ops.to_can_run  =   0;	
+  mm_ops.to_notice_signals =   0;
+  mm_ops.to_thread_alive  =   0;
+  mm_ops.to_stop  =   0;		
+  mm_ops.to_pid_to_exec_file = NULL;
+  mm_ops.to_core_file_to_sym_file = NULL;
+  mm_ops.to_stratum =   process_stratum;
+  mm_ops.DONT_USE =   0; 
+  mm_ops.to_has_all_memory =   1;
+  mm_ops.to_has_memory =   1;
+  mm_ops.to_has_stack =   1;
+  mm_ops.to_has_registers =   1;
+  mm_ops.to_has_execution =   1; 
+  mm_ops.to_sections =   0;
+  mm_ops.to_sections_end =   0;	
+  mm_ops.to_magic =   OPS_MAGIC;    
+};
+
+void
+_initialize_remote_mm()
+{
+  init_mm_ops() ;
+  add_target (&mm_ops);
+}
+
+#ifdef NO_HIF_SUPPORT
+service_HIF(msg)
+union msg_t	*msg;
+{
+	return(0);	/* Emulate a failure */
+}
+#endif