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, 70 insertions, 0 deletions

diff --git a/c/src/librdbg/src/i386/rdbg_cpu_asm.s b/c/src/librdbg/src/i386/rdbg_cpu_asm.s
new file mode 100644
index 0000000000..f0942310ce
--- /dev/null
+++ b/c/src/librdbg/src/i386/rdbg_cpu_asm.s
@@ -0,0 +1,70 @@
+/*  cpu_asm.s
+ *
+ *  This file contains all assembly code for the Intel i386 implementation
+ *  of RDBG.
+ *
+ */
+
+#include <asm.h>
+
+        BEGIN_CODE
+
+/*
+ *  void copyback_data_cache_and_invalidate_instr_cache()
+ *
+ *  This routine performs a copy of the data cache 
+ *  and invalidate the instruction cache
+ */
+
+        .p2align  1
+        PUBLIC (copyback_data_cache_and_invalidate_instr_cache)
+
+SYM (copyback_data_cache_and_invalidate_instr_cache):
+        wbinvd
+        ret
+
+
+	
+/*
+ * void enterRdbg(void)
+ *	
+ * This function perform a call to the exception 19
+ * It is used :
+ *   1 - in the user code, to simulate a Breakpoint.
+ *       (with justSaveContext = 0)
+ *   2 - in the RDBG code, to push a ctx in the list.
+ *       (with justSaveContext = 1)
+ *
+ * In most of case, it will be use as described in 1.
+ * The 2nd possibility will be used by RDBG to obtain
+ * its own ctx
+ */
+
+        PUBLIC (enterRdbg)
+
+SYM (enterRdbg):
+        int $50
+        ret
+
+
+/*
+ * void rtems_exception_prologue_50(void)
+ *	
+ * Exception 50 is used to enter Rdbg
+ *
+ */
+	
+        .p2align 4
+	
+        PUBLIC (rtems_exception_prologue_50)
+        PUBLIC (_Exception_Handler)
+
+SYM (rtems_exception_prologue_50):	
+	pushl	$ 0
+	pushl	$ 50	
+        jmp   SYM(_Exception_Handler) ;
+
+
+END_CODE
+
+END