Applied patches from Tony.Thompson@arm.com to implement the Angel remote

debugging interface and resurrected associated RDI files.

1 files changed, 966 insertions, 0 deletions

diff --git a/gdb/remote-rdi.c b/gdb/remote-rdi.c
new file mode 100644
index 0000000..19cedd3
--- /dev/null
+++ b/gdb/remote-rdi.c
@@ -0,0 +1,966 @@
+/* GDB interface to ARM RDI library.
+   Copyright 1997 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+
+#include "defs.h"
+#include "gdb_string.h"
+#include <fcntl.h>
+#include "frame.h"
+#include "inferior.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "target.h"
+#include "wait.h"
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "gdbthread.h"
+#include "gdbcore.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <signal.h>
+
+#include "rdi-share/ardi.h"
+#include "rdi-share/adp.h"
+#include "rdi-share/hsys.h"
+
+/* Prototypes for local functions */
+
+static void arm_rdi_files_info PARAMS ((struct target_ops *ignore));
+
+static int arm_rdi_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr,
+				       int len, int should_write,
+				       struct target_ops *target));
+
+static void arm_rdi_prepare_to_store PARAMS ((void));
+
+static void arm_rdi_fetch_registers PARAMS ((int regno));
+
+static void arm_rdi_resume PARAMS ((int pid, int step,
+				   enum target_signal siggnal));
+
+static int arm_rdi_start_remote PARAMS ((char *dummy));
+
+static void arm_rdi_open PARAMS ((char *name, int from_tty));
+
+static void arm_rdi_create_inferior PARAMS ((char *exec_file, char *args,
+					     char **env));
+
+static void arm_rdi_close PARAMS ((int quitting));
+
+static void arm_rdi_store_registers PARAMS ((int regno));
+
+static void arm_rdi_mourn PARAMS ((void));
+
+static void arm_rdi_send PARAMS ((char *buf));
+
+static int arm_rdi_wait PARAMS ((int pid, struct target_waitstatus *status));
+
+static void arm_rdi_kill PARAMS ((void));
+
+static void arm_rdi_detach PARAMS ((char *args, int from_tty));
+
+static void arm_rdi_interrupt PARAMS ((int signo));
+
+static void arm_rdi_interrupt_twice PARAMS ((int signo));
+
+static void interrupt_query PARAMS ((void));
+
+static int arm_rdi_insert_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static int arm_rdi_remove_breakpoint PARAMS ((CORE_ADDR, char *));
+
+static char *rdi_error_message PARAMS ((int err));
+
+static enum target_signal rdi_error_signal PARAMS ((int err));
+
+extern struct target_ops arm_rdi_ops;	/* Forward decl */
+
+static struct Dbg_ConfigBlock gdb_config;
+
+static struct Dbg_HostosInterface gdb_hostif;
+
+static int max_load_size;
+
+static int execute_status;
+
+/* A little list of breakpoints that have been set.  */
+
+static struct local_bp_list_entry {
+  CORE_ADDR addr;
+  PointHandle point;
+  struct local_bp_list_entry *next;
+} *local_bp_list;
+
+
+/* Stub for catch_errors.  */
+
+static int
+arm_rdi_start_remote (dummy)
+     char *dummy;
+{
+  return 1;
+}
+
+/* Helper callbacks for the "host interface" structure.  RDI functions call
+   these to forward output from the target system and so forth.  */
+
+void
+voiddummy()
+{
+  printf("void dummy\n");
+}
+
+static void
+myprint (arg, format, ap)
+     PTR arg;
+     const char *format;
+     va_list ap;
+{
+  vfprintf (stdout, format, ap);
+}
+
+static void
+mywritec (arg, c)
+     PTR arg;
+     int c;
+{
+  fputc (c, (FILE *) arg);
+}
+
+static int
+mywrite (arg, buffer, len)
+     PTR arg;
+     char const *buffer;
+     int len;
+{
+  return fwrite (buffer, 1, len, stdout);
+}
+
+static void
+mypause (arg)
+     PTR arg;
+{
+}
+
+/* These last two are tricky as we have to handle the special case of
+   being interrupted more carefully */
+
+static int
+myreadc (arg)
+     PTR arg;
+{ 
+  return fgetc (stdin);
+}
+
+static char *
+mygets (arg, buffer, len)
+     PTR arg;
+     char *buffer;
+     int len;
+{
+  return fgets(buffer, len, stdin);
+}
+
+/* Open a connection to a remote debugger.  NAME is the filename used
+   for communication.  */
+
+static void
+arm_rdi_open (name, from_tty)
+     char *name;
+     int from_tty;
+{
+  int rslt, i;
+  unsigned long arg1, arg2;
+
+  if (name == NULL)
+    error ("To open an RDI connection, you need to specify what serial\n\
+device is attached to the remote system (e.g. /dev/ttya).");
+
+  /* Make the basic low-level connection.  */
+
+  rslt = Adp_OpenDevice (NULL, NULL, 1);
+
+  if (rslt != adp_ok)
+    error ("Could not open port");
+
+  gdb_config.bytesex = 2 | (target_byte_order == BIG_ENDIAN ? 1 : 0);
+  gdb_config.fpe = 1;
+  gdb_config.rditype = 2;
+  gdb_config.heartbeat_on = 1;
+  gdb_config.flags = 2;
+
+  gdb_hostif.dbgprint = myprint;
+  gdb_hostif.dbgpause = mypause;
+  gdb_hostif.dbgarg = stdout;
+  gdb_hostif.writec = mywritec;
+  gdb_hostif.readc = myreadc;
+  gdb_hostif.write = mywrite;
+  gdb_hostif.gets = mygets;
+  gdb_hostif.hostosarg = stdout;
+  gdb_hostif.reset = voiddummy;
+
+  rslt = angel_RDI_open (10, &gdb_config, &gdb_hostif, NULL);
+  if (rslt == RDIError_BigEndian || rslt == RDIError_LittleEndian)
+    ;  /* do nothing, this is the expected return */
+  else if (rslt)
+    {
+      printf_filtered ("RDI_open: %s\n", rdi_error_message (rslt));
+    }
+
+  rslt = angel_RDI_info (RDIInfo_Target, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_Points, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_Step, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_CoPro, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_SemiHosting, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_Icebreaker, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_DownLoad, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  rslt = angel_RDI_info (RDIInfo_GetLoadSize, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  max_load_size = arg1;
+
+  push_target (&arm_rdi_ops);
+
+  target_fetch_registers (-1);
+
+  rslt = angel_RDI_open (1, &gdb_config, NULL, NULL);
+  if (rslt)
+    {
+      printf_filtered ("RDI_open: %s\n", rdi_error_message (rslt));
+    }
+
+  arg1 = 0x13b;
+  rslt = angel_RDI_info (RDIVector_Catch, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+
+  arg1 = (unsigned long) "";
+  rslt = angel_RDI_info (RDISet_Cmdline, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+
+  /* Clear out any existing records of breakpoints.  */
+  {
+    struct local_bp_list_entry *entry, *preventry = NULL;
+
+    for (entry = local_bp_list; entry != NULL; entry = entry->next)
+      {
+	if (preventry)
+	  free (preventry);
+      }
+  }
+
+  printf_filtered ("Connected to ARM RDI target.\n");
+}
+
+/* Start an inferior process and set inferior_pid to its pid.
+   EXEC_FILE is the file to run.
+   ARGS is a string containing the arguments to the program.
+   ENV is the environment vector to pass.  Errors reported with error().
+   On VxWorks and various standalone systems, we ignore exec_file.  */
+/* This is called not only when we first attach, but also when the
+   user types "run" after having attached.  */
+
+static void
+arm_rdi_create_inferior (exec_file, args, env)
+     char *exec_file;
+     char *args;
+     char **env;
+{
+  int len, rslt;
+  unsigned long arg1, arg2;
+  char *arg_buf;
+  CORE_ADDR entry_point;
+
+  if (exec_file == 0 || exec_bfd == 0)
+   error ("No exec file specified.");
+
+  entry_point = (CORE_ADDR) bfd_get_start_address (exec_bfd);
+
+  arm_rdi_kill ();	 
+  remove_breakpoints ();
+  init_wait_for_inferior ();
+
+  len = strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10;
+  arg_buf = (char *) alloca (len);
+  arg_buf[0] = '\0';
+  strcat (arg_buf, exec_file);
+  strcat (arg_buf, " ");
+  strcat (arg_buf, args);
+
+  inferior_pid = 42;
+  insert_breakpoints ();  /* Needed to get correct instruction in cache */
+
+  if ( env != NULL)
+    {
+      while (*env)
+	{
+	  if (strncmp(*env, "MEMSIZE=", sizeof("MEMSIZE=")-1)==0)
+	    {
+	      unsigned long top_of_memory;
+	      char *end_of_num;
+
+	      /* Set up memory limit */
+	      top_of_memory = strtoul(*env + sizeof("MEMSIZE=")-1,
+				      &end_of_num, 0);
+	      printf_filtered ("Setting top-of-memory to 0x%x\n",
+			       top_of_memory);
+	  
+	      rslt=angel_RDI_info (RDIInfo_SetTopMem, &top_of_memory, &arg2);
+	      if (rslt)
+		{
+		  printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+		}
+	    }
+	  env++;
+	}
+    }
+
+  arg1 = (unsigned long) arg_buf;
+  rslt = angel_RDI_info (RDISet_Cmdline, /* &arg1 */ (unsigned long *)arg_buf, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+
+  proceed (entry_point, TARGET_SIGNAL_DEFAULT, 0);
+}
+
+/* This takes a program previously attached to and detaches it.  After
+   this is done, GDB can be used to debug some other program.  We
+   better not have left any breakpoints in the target program or it'll
+   die when it hits one.  */
+
+static void
+arm_rdi_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  /* (anything to do?) */
+}
+
+/* Clean up connection to a remote debugger.  */
+
+static void
+arm_rdi_close (quitting)
+     int quitting;
+{
+  int rslt;
+
+  rslt = angel_RDI_close ();
+  if (rslt)
+    {
+      printf_filtered ("RDI_close: %s\n", rdi_error_message (rslt));
+    }
+}
+
+/* Tell the remote machine to resume.  */
+
+static void
+arm_rdi_resume (pid, step, siggnal)
+     int pid, step;
+     enum target_signal siggnal;
+{
+  int rslt;
+  PointHandle point;
+
+  if (0 /* turn on when hardware supports single-stepping */)
+    {
+      rslt = angel_RDI_step (1, &point);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_step: %s\n", rdi_error_message (rslt));
+	}
+    }
+  else
+    {
+      char handle[4];
+      CORE_ADDR pc;
+
+      if (step)
+	{
+	  pc = read_register (PC_REGNUM);
+	  pc = arm_get_next_pc (pc);
+	  arm_rdi_insert_breakpoint (pc, handle);
+	}
+      execute_status = rslt = angel_RDI_execute (&point);
+      if (rslt == RDIError_BreakpointReached)
+	;
+      else if (rslt)
+	{
+	  printf_filtered ("RDI_execute: %s\n", rdi_error_message (rslt));
+	}
+      if (step)
+	{
+	  arm_rdi_remove_breakpoint (pc, handle);
+	}
+    }
+}
+
+/* Send ^C to target to halt it.  Target will respond, and send us a
+   packet.  */
+
+static void
+arm_rdi_interrupt (signo)
+     int signo;
+{
+}
+
+static void (*ofunc)();
+
+/* The user typed ^C twice.  */
+static void
+arm_rdi_interrupt_twice (signo)
+     int signo;
+{
+}
+
+/* Ask the user what to do when an interrupt is received.  */
+
+static void
+interrupt_query ()
+{
+}
+
+/* Wait until the remote machine stops, then return, storing status in
+   STATUS just as `wait' would.  Returns "pid" (though it's not clear
+   what, if anything, that means in the case of this target).  */
+
+static int
+arm_rdi_wait (pid, status)
+     int pid;
+     struct target_waitstatus *status;
+{
+  status->kind = execute_status == RDIError_NoError ?
+    TARGET_WAITKIND_EXITED : TARGET_WAITKIND_STOPPED;
+
+  /* convert stopped code from target into right signal */
+  status->value.sig = rdi_error_signal ( execute_status );
+
+  return inferior_pid;
+}
+
+/* Read the remote registers into the block REGS.  */
+
+/* ARGSUSED */
+static void
+arm_rdi_fetch_registers (regno)
+     int regno;
+{
+  int rslt, rdi_regmask;
+  unsigned long rawreg, rawregs[32];
+  char cookedreg[4];
+
+  if (regno == -1) 
+    {
+      rslt = angel_RDI_CPUread (255, 0x27fff, rawregs);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_CPUread: %s\n", rdi_error_message (rslt));
+	}
+
+      for (regno = 0; regno < 15; regno++)
+	{
+	  store_unsigned_integer (cookedreg, 4, rawregs[regno]);
+	  supply_register (regno, (char *) cookedreg);
+	}
+      store_unsigned_integer (cookedreg, 4, rawregs[15]);
+      supply_register (PS_REGNUM, (char *) cookedreg);
+      arm_rdi_fetch_registers (PC_REGNUM);
+    }
+  else
+    {
+      if (regno == PC_REGNUM)
+	rdi_regmask = RDIReg_PC;
+      else if (regno == PS_REGNUM)
+	rdi_regmask = RDIReg_CPSR;
+      else if (regno < 0 || regno > 15)
+	{
+	  rawreg = 0;
+	  supply_register (regno, (char *) &rawreg);
+	  return;
+	}
+      else
+	rdi_regmask = 1 << regno;
+
+      rslt = angel_RDI_CPUread (255, rdi_regmask, &rawreg);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_CPUread: %s\n", rdi_error_message (rslt));
+	}
+      store_unsigned_integer (cookedreg, 4, rawreg);
+      supply_register (regno, (char *) cookedreg);
+    }
+}
+
+static void 
+arm_rdi_prepare_to_store ()
+{
+  /* Nothing to do.  */
+}
+
+/* Store register REGNO, or all registers if REGNO == -1, from the contents
+   of REGISTERS.  FIXME: ignores errors.  */
+
+static void
+arm_rdi_store_registers (regno)
+     int regno;
+{
+  int rslt, rdi_regmask;
+
+  /* These need to be able to take 'floating point register' contents */
+  unsigned long rawreg[3], rawerreg[3];
+
+  if (regno  == -1) 
+    {
+      for (regno = 0; regno < NUM_REGS; regno++)
+	arm_rdi_store_registers (regno);
+    }
+  else
+    {
+      read_register_gen (regno, (char *) rawreg);
+      /* RDI manipulates data in host byte order, so convert now. */
+      store_unsigned_integer (rawerreg, 4, rawreg[0]);
+
+      if (regno == PC_REGNUM)
+	rdi_regmask = RDIReg_PC;
+      else if (regno == PS_REGNUM)
+	rdi_regmask = RDIReg_CPSR;
+      else if (regno < 0 || regno > 15)
+	return;
+      else
+	rdi_regmask = 1 << regno;
+
+      rslt = angel_RDI_CPUwrite (255, rdi_regmask, rawerreg);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_CPUwrite: %s\n", rdi_error_message (rslt));
+	}
+    }
+}
+
+/* Read or write LEN bytes from inferior memory at MEMADDR,
+   transferring to or from debugger address MYADDR.  Write to inferior
+   if SHOULD_WRITE is nonzero.  Returns length of data written or
+   read; 0 for error.  */
+
+/* ARGSUSED */
+static int
+arm_rdi_xfer_memory(memaddr, myaddr, len, should_write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int should_write;
+     struct target_ops *target;			/* ignored */
+{
+  int rslt, i;
+
+  if (should_write)
+    {
+      rslt = angel_RDI_write (myaddr, memaddr, &len);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_write: %s\n", rdi_error_message (rslt));
+	}
+    }
+  else 
+    {
+      rslt = angel_RDI_read (memaddr, myaddr, &len);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_read: %s\n", rdi_error_message (rslt));
+	  len = 0;
+	}
+    }
+  return len;
+}
+
+/* Display random info collected from the target.  */
+
+static void
+arm_rdi_files_info (ignore)
+     struct target_ops *ignore;
+{
+  char *file = "nothing";
+  int rslt;
+  unsigned long arg1, arg2;
+
+  rslt = angel_RDI_info (RDIInfo_Target, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  if (arg1 & (1 << 15))
+    printf_filtered ("Target supports Thumb code.\n");
+  if (arg1 & (1 << 14))
+    printf_filtered ("Target can do profiling.\n");
+  if (arg1 & (1 << 4))
+    printf_filtered ("Target is real hardware.\n");
+  
+  rslt = angel_RDI_info (RDIInfo_Step, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  printf_filtered ("Target can%s single-step.\n", (arg1 & 0x4 ? "" : "not"));
+
+  rslt = angel_RDI_info (RDIInfo_Icebreaker, &arg1, &arg2);
+  if (rslt)
+    {
+      printf_filtered ("RDI_info: %s\n", rdi_error_message (rslt));
+    }
+  else
+    printf_filtered ("Target includes an EmbeddedICE.\n");
+}
+
+static void
+arm_rdi_kill ()
+{
+  int rslt;
+
+  rslt = angel_RDI_open (1, &gdb_config, NULL, NULL);
+  if (rslt)
+    {
+      printf_filtered ("RDI_open: %s\n", rdi_error_message (rslt));
+    }
+}
+
+static void
+arm_rdi_mourn_inferior ()
+{
+  unpush_target (&arm_rdi_ops);
+  generic_mourn_inferior ();
+}
+
+/* While the RDI library keeps track of its own breakpoints, we need
+   to remember "handles" so that we can delete them later.  Since
+   breakpoints get used for stepping, be careful not to leak memory
+   here.  */
+
+static int
+arm_rdi_insert_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  int rslt;
+  PointHandle point;
+  struct local_bp_list_entry *entry;
+  int type = RDIPoint_EQ;
+
+  if (arm_pc_is_thumb (addr) || arm_pc_is_thumb_dummy (addr))
+    type |= RDIPoint_16Bit;
+  rslt = angel_RDI_setbreak (addr, type, 0, &point);
+  if (rslt)
+    {
+      printf_filtered ("RDI_setbreak: %s\n", rdi_error_message (rslt));
+    }
+  entry =
+    (struct local_bp_list_entry *) xmalloc (sizeof (struct local_bp_list_entry));
+  entry->addr = addr;
+  entry->point = point;
+  entry->next = local_bp_list;
+  local_bp_list = entry;
+  return rslt;
+}
+
+static int
+arm_rdi_remove_breakpoint (addr, contents_cache)
+     CORE_ADDR addr;
+     char *contents_cache;
+{
+  int rslt;
+  PointHandle point;
+  struct local_bp_list_entry *entry, *preventry;
+
+  for (entry = local_bp_list; entry != NULL; entry = entry->next)
+    {
+      if (entry->addr == addr)
+	{
+	  break;
+	}
+      preventry = entry;
+    }
+  if (entry)
+    {
+      rslt = angel_RDI_clearbreak (entry->point);
+      if (rslt)
+	{
+	  printf_filtered ("RDI_clearbreak: %s\n", rdi_error_message (rslt));
+	}
+      /* Delete the breakpoint entry locally.  */
+      if (entry == local_bp_list)
+	{
+	  local_bp_list = entry->next;
+	}
+      else
+	{
+	  preventry->next = entry->next;
+	}
+      free (entry);
+    }
+  return 0;
+}
+
+static char *
+rdi_error_message (err)
+     int err;
+{
+  switch (err)
+    {
+    case RDIError_NoError: 
+      return "no error";
+    case RDIError_Reset:
+      return "debuggee reset";
+    case RDIError_UndefinedInstruction:
+      return "undefined instruction";
+    case RDIError_SoftwareInterrupt:
+      return "SWI trapped";
+    case RDIError_PrefetchAbort:
+      return "prefetch abort, execution ran into unmapped memory?";
+    case RDIError_DataAbort:
+      return "data abort, no memory at specified address?";
+    case RDIError_AddressException:
+      return "address exception, access >26bit in 26bit mode";
+    case RDIError_IRQ:
+      return "IRQ, interrupt trapped";
+    case RDIError_FIQ:
+      return "FIQ, fast interrupt trapped";
+    case RDIError_Error:
+      return "a miscellaneous type of error";
+    case RDIError_BranchThrough0:
+      return "branch through location 0";
+    case RDIError_NotInitialised:
+      return "internal error, RDI_open not called first";
+    case RDIError_UnableToInitialise:
+      return "internal error, target world is broken";
+    case RDIError_WrongByteSex:
+      return "See Operator: WrongByteSex";
+    case RDIError_UnableToTerminate:
+      return "See Operator: Unable to Terminate";
+    case RDIError_BadInstruction:
+      return "bad instruction, illegal to execute this instruction";
+    case RDIError_IllegalInstruction:
+      return "illegal instruction, the effect of executing it is undefined";
+    case RDIError_BadCPUStateSetting:
+      return "internal error, tried to set SPSR of user mode";
+    case RDIError_UnknownCoPro:
+      return "unknown co-processor";
+    case RDIError_UnknownCoProState:
+      return "cannot execute co-processor request";
+    case RDIError_BadCoProState:
+      return "recognizably broken co-processor request";
+    case RDIError_BadPointType:
+      return "internal error, bad point yype";
+    case RDIError_UnimplementedType:
+      return "internal error, unimplemented type";
+    case RDIError_BadPointSize:
+      return "internal error, bad point size";
+    case RDIError_UnimplementedSize:
+      return "internal error, unimplemented size";
+    case RDIError_NoMorePoints:
+      return "last break/watch point was used";
+    case RDIError_BreakpointReached:
+      return "breakpoint reached";
+    case RDIError_WatchpointAccessed:
+      return "watchpoint accessed";
+    case RDIError_NoSuchPoint:
+      return "attempted to clear non-existent break/watch point";
+    case RDIError_ProgramFinishedInStep:
+      return "end of the program reached while stepping";
+    case RDIError_UserInterrupt:
+      return "you pressed Escape";
+    case RDIError_CantSetPoint:
+      return "no more break/watch points available";
+    case RDIError_IncompatibleRDILevels:
+      return "incompatible RDI levels";
+    case RDIError_LittleEndian:
+      return "debuggee is little endian";
+    case RDIError_BigEndian:
+      return "debuggee is big endian";
+    case RDIError_SoftInitialiseError:
+      return "recoverable error in RDI initialization";
+    case RDIError_InsufficientPrivilege:
+      return "internal error, supervisor state not accessible to monitor";
+    case RDIError_UnimplementedMessage:
+      return "internal error, unimplemented message";
+    case RDIError_UndefinedMessage:
+      return "internal error, undefined message";
+    default:
+      return "undefined error message, should reset target"; 
+    }
+}
+
+/* Convert the ARM error messages to signals that GDB knows about.  */
+
+static enum target_signal
+rdi_error_signal (err)
+     int err;
+{
+  switch (err)
+    {
+    case RDIError_NoError:
+      return 0;
+    case RDIError_Reset:
+      return TARGET_SIGNAL_TERM; /* ??? */
+    case RDIError_UndefinedInstruction:
+      return TARGET_SIGNAL_ILL;
+    case RDIError_SoftwareInterrupt:
+    case RDIError_PrefetchAbort:
+    case RDIError_DataAbort:
+      return TARGET_SIGNAL_TRAP;
+    case RDIError_AddressException:
+      return TARGET_SIGNAL_SEGV;
+    case RDIError_IRQ:
+    case RDIError_FIQ:
+      return TARGET_SIGNAL_TRAP;
+    case RDIError_Error:
+      return TARGET_SIGNAL_TERM;
+    case RDIError_BranchThrough0:
+      return TARGET_SIGNAL_TRAP;
+    case RDIError_NotInitialised:
+    case RDIError_UnableToInitialise:
+    case RDIError_WrongByteSex:
+    case RDIError_UnableToTerminate:
+      return TARGET_SIGNAL_UNKNOWN;
+    case RDIError_BadInstruction:
+    case RDIError_IllegalInstruction:
+      return TARGET_SIGNAL_ILL;
+    case RDIError_BadCPUStateSetting:
+    case RDIError_UnknownCoPro:
+    case RDIError_UnknownCoProState:
+    case RDIError_BadCoProState:
+    case RDIError_BadPointType:
+    case RDIError_UnimplementedType:
+    case RDIError_BadPointSize:
+    case RDIError_UnimplementedSize:
+    case RDIError_NoMorePoints:
+      return TARGET_SIGNAL_UNKNOWN;
+    case RDIError_BreakpointReached:
+    case RDIError_WatchpointAccessed:
+      return TARGET_SIGNAL_TRAP;
+    case RDIError_NoSuchPoint:
+    case RDIError_ProgramFinishedInStep:
+      return TARGET_SIGNAL_UNKNOWN;
+    case RDIError_UserInterrupt:
+      return TARGET_SIGNAL_INT;
+    case RDIError_IncompatibleRDILevels:
+    case RDIError_LittleEndian:
+    case RDIError_BigEndian:
+    case RDIError_SoftInitialiseError:
+    case RDIError_InsufficientPrivilege:
+    case RDIError_UnimplementedMessage:
+    case RDIError_UndefinedMessage:
+    default:
+      return TARGET_SIGNAL_UNKNOWN; 
+    }
+}
+
+/* Define the target operations structure.  */
+
+struct target_ops arm_rdi_ops = {
+  "rdi",			/* to_shortname */
+  "ARM RDI",			/* to_longname */
+  "Use a remote ARM-based computer, via the RDI library.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
+  arm_rdi_open,			/* to_open */
+  arm_rdi_close,		/* to_close */
+  NULL,				/* to_attach */
+  arm_rdi_detach,		/* to_detach */
+  arm_rdi_resume,		/* to_resume */
+  arm_rdi_wait,			/* to_wait */
+  arm_rdi_fetch_registers,	/* to_fetch_registers */
+  arm_rdi_store_registers,	/* to_store_registers */
+  arm_rdi_prepare_to_store,	/* to_prepare_to_store */
+  arm_rdi_xfer_memory,		/* to_xfer_memory */
+  arm_rdi_files_info,		/* to_files_info */
+  arm_rdi_insert_breakpoint,	/* to_insert_breakpoint */
+  arm_rdi_remove_breakpoint,	/* to_remove_breakpoint */
+  NULL,				/* to_terminal_init */
+  NULL,				/* to_terminal_inferior */
+  NULL,				/* to_terminal_ours_for_output */
+  NULL,				/* to_terminal_ours */
+  NULL,				/* to_terminal_info */
+  arm_rdi_kill,			/* to_kill */
+  generic_load,			/* to_load */
+  NULL,				/* to_lookup_symbol */
+  arm_rdi_create_inferior,	/* to_create_inferior */
+  arm_rdi_mourn_inferior,	/* to_mourn_inferior */
+  0,				/* to_can_run */
+  0,				/* to_notice_signals */
+  0,				/* to_thread_alive */
+  0,				/* to_stop */
+  process_stratum,		/* to_stratum */
+  NULL,				/* to_next */
+  1,				/* to_has_all_memory */
+  1,				/* to_has_memory */
+  1,				/* to_has_stack */
+  1,				/* to_has_registers */
+  1,				/* to_has_execution */
+  NULL,				/* sections */
+  NULL,				/* sections_end */
+  OPS_MAGIC			/* to_magic */
+};
+
+void
+_initialize_remote_rdi ()
+{
+  add_target (&arm_rdi_ops);
+}
+
+/* A little dummy to make linking with the library succeed. */
+
+Fail() {}