Patch from Emmanuel Raguet <raguet@crf.canon.fr> to add remote debug server

and RPC support to RTEMS.  Thanks. :)  Email follows:

    Hello,

    For Xmas, here is the Remote Debugger on RTEMS !

    Here are 2 patches for the Remote Debugger on RTEMS for pc386 from Linux
    host :

     - one for RTEMS it self,
     - one for GDB-4.17.


    1/ RTEMS patch
    --------------

    This patch adds 2 libraries :
     - a simplified SUN RPC library
     - the Remote Debugger library

    The configuration command is the following :
    ../rtems4/configure --target=i386-rtemself --enable-rtemsbsp=pc386
    --enable-rdbg

    The SUN RPC library is built only if networking is set.
    The RDBG library is built if networking and enable-rdbg are set.

    The function used to initialize the debugger is :
            rtems_rdbg_initialize ();

    A special function has been created to force a task to be
    in a "debug" state : enterRdbg().
    The use of this function is not mandatory.



    2/ GDB-4.17 patch
    -----------------

    This patch create a new RTEMS target for GDB-4.17.

    The configuration command is the following :
    ./configure --enable-shared --target=i386RTEMS

    To connect to a target, use :
      target rtems [your_site_address]

    Then, attach the target using : attach 1

    And... Debug ;)

    You can obtain the original GDB-4.17 on
    ftp://ftp.debian.org/debian/dists/stable/main/source/devel/gdb_4.17.orig.tar.gz

    This has been tested from a Debian 2.0.1 linux host.

1 files changed, 139 insertions, 0 deletions

diff --git a/c/src/librdbg/src/rdbg.c b/c/src/librdbg/src/rdbg.c
new file mode 100644
index 0000000000..1f04119e8e
--- /dev/null
+++ b/c/src/librdbg/src/rdbg.c
@@ -0,0 +1,139 @@
+/*
+ **************************************************************************
+ *
+ * Component =   
+ * 
+ * Synopsis  =   rkdb/rkdb.c
+ *
+ **************************************************************************
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <rtems.h>
+#include <rtems/error.h>
+#include <rdbg/rdbg.h>
+#include <rdbg/servrpc.h>
+
+u_short  rtemsPort = RTEMS_PORT;
+int	 BackPort = RTEMS_BACK_PORT;
+int      rtemsActive = 0;
+SVCXPRT* rtemsXprt;
+int      rtemsSock;
+char	 ActName[] = "RTEMS";
+volatile int 		ExitForSingleStep = 0 ;
+volatile int 		Continue;
+volatile int 		justSaveContext;
+volatile Objects_Id 	currentTargetThread;
+volatile int 		CannotRestart = 0;
+volatile int 		TotalReboot = 0;
+int CONN_LIST_INC = 3;
+int PID_LIST_INC  = 1;
+int TSP_RETRIES   = 10;
+
+
+    int
+getId()
+{
+  rtems_id id;
+  
+  rtems_task_ident(RTEMS_SELF, RTEMS_SEARCH_ALL_NODES, &id);
+    return (int)(id) ;
+}
+
+    static int
+rdbgInit (void)
+{
+    int sock;
+    struct sockaddr_in addr;
+
+    sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+    if (sock == -1) {
+	printf("%s: rkdbInit: cannot allocate socket\n", ActName);
+	return -1;
+    }
+
+    bzero( (void *)&addr, sizeof(struct sockaddr_in));
+    addr.sin_port = htons(rtemsPort);
+    if ((bind(sock, (struct sockaddr*) &addr, sizeof(addr))) == -1) {
+	printf("%s: rkdbInit: cannot bind socket\n", ActName);
+	return -2;
+    }
+    rtemsXprt = svcudp_create(sock);
+    if (svcudp_enablecache(rtemsXprt, 1) == 0) {
+        printf("%s: rkdbInit: cannot enable rpc cache\n", ActName);
+        return -3;
+    }
+    rtemsSock = sock;
+    return 0;
+}
+
+    rtems_task
+rdbgDaemon (rtems_task_argument argument)
+{
+  for (;;){
+
+    if (TotalReboot == 1){
+      rtemsReboot();
+    }
+
+    svc_processrequest(	rtemsXprt, REMOTEDEB, REMOTEVERS, remotedeb_2);
+  }
+}
+
+    void
+rtems_rdbg_initialize (void)
+{
+  rtems_name        task_name;
+  rtems_id          tid;
+  rtems_status_code status;
+
+#ifdef DDEBUG
+	rdb_debug = 1;           /* DPRINTF now will display */
+#endif
+
+    DPRINTF (("%s init starting\n", ActName));
+
+    /* Print version string */
+#ifdef DDEBUG
+    printk ("RDBG v.%d built on [%s %s]\n", SERVER_VERS, __DATE__, __TIME__);
+#else
+    printk ("RDBG v.%d\n", SERVER_VERS);
+#endif
+
+    /* Create socket and init UDP RPC server */
+    if (rdbgInit() != 0) goto error;
+
+    Continue = 1;
+    justSaveContext = 0;
+    currentTargetThread = 0;
+    
+    task_name = rtems_build_name( 'R', 'D', 'B', 'G' );
+    if ((status = rtems_task_create( task_name, 5, 24576,
+				     RTEMS_INTERRUPT_LEVEL(0),
+				     RTEMS_DEFAULT_ATTRIBUTES | RTEMS_SYSTEM_TASK
+				     , &tid ))
+	!= RTEMS_SUCCESSFUL){
+      printf("status = %d\n",status);
+      rtems_panic ("Can't create task.\n");
+    }
+
+    status = rtems_task_start(tid, rdbgDaemon, 0);
+
+    return;
+
+error:
+    printf ("initialization failed.\n");
+}
+
+    void
+setErrno (int error)
+{
+    errno = error;
+}
+
+    int
+getErrno()
+{
+    return errno;
+}