Patch from Eric Valette <valette@crf.canon.fr> and Emmanuel Raguet

<raguet@crf.canon.fr>:

    - the dec21140 driver code has been hardened (various bug fixed) Emmanuel,
    - bug in the mcp750 init code have been fixed (interrupt stack/initial
      stack initialization), BSS correctly cleared (Eric V)
    - remote debugging over TCP/IP is nearly complete (berakpoints,
      backtrace, variables,...) (Eric V),
    - exception handling code has also been improved in order to fully
      support RDBG requirements (Eric V),

1 files changed, 136 insertions, 0 deletions

diff --git a/c/src/librdbg/src/excep.c b/c/src/librdbg/src/excep.c
new file mode 100644
index 0000000000..d3183e24e2
--- /dev/null
+++ b/c/src/librdbg/src/excep.c
@@ -0,0 +1,136 @@
+/*
+ **************************************************************************
+ *
+ * Component =   
+ * 
+ * Synopsis  =   rdbgexcep.c
+ *
+ * $Id$
+ *
+ **************************************************************************
+ */
+
+#include <rtems.h>
+#include <rtems/error.h>
+#include <assert.h>
+#include <errno.h>
+#include <rdbg/rdbg.h>
+#include <rdbg/servrpc.h>
+
+unsigned int NbExceptCtx;
+volatile unsigned int NbSerializedCtx;
+Exception_context *FirstCtx = NULL;
+Exception_context *LastCtx = NULL;
+
+CPU_Exception_frame SavedContext;
+
+
+/********* Save an exception context at the end of a list *****/
+
+int PushExceptCtx ( Objects_Id Id, Objects_Id semId, CPU_Exception_frame *ctx ) {
+
+  Exception_context *SaveCtx;
+
+  SaveCtx = (Exception_context *)malloc(sizeof(Exception_context));
+  if (SaveCtx == NULL)
+    rtems_panic("Can't allocate memory to save Exception context");
+  
+  SaveCtx->id = Id;
+  SaveCtx->ctx = ctx;
+  SaveCtx->semaphoreId = semId;
+  SaveCtx->previous = NULL;
+  SaveCtx->next = NULL;
+  
+  if (FirstCtx == NULL){  /* initialization */
+    FirstCtx = SaveCtx;
+    LastCtx  = SaveCtx;
+    NbExceptCtx = 1;
+  }
+  else {
+    NbExceptCtx ++;
+    LastCtx->next = SaveCtx;
+    SaveCtx->previous = LastCtx;
+    LastCtx = SaveCtx;
+  }
+  return 0;
+}
+
+/********* Save an temporary exception context in a ******/
+/********* global variable                          ******/
+
+int PushSavedExceptCtx ( Objects_Id Id, CPU_Exception_frame *ctx ) {
+
+  memcpy (&(SavedContext), ctx, sizeof(CPU_Exception_frame));
+  return 0;
+}
+
+
+/****** Remove the context of the specified Id thread *********/
+/****** If Id = -1, then return the first context     *********/
+
+
+int PopExceptCtx ( Objects_Id Id ) {
+
+  Exception_context *ExtractCtx;
+  
+  if (FirstCtx == NULL) return -1;
+  
+  if  (Id == -1) {
+    ExtractCtx = LastCtx;
+    LastCtx = LastCtx->previous;
+    free(ExtractCtx);
+    NbExceptCtx --;
+    return 0;
+  }
+  
+  ExtractCtx = LastCtx;
+  
+  while (ExtractCtx->id != Id && ExtractCtx != NULL) {
+    ExtractCtx = ExtractCtx->previous;
+  }
+
+  if (ExtractCtx == NULL)
+    return -1;
+
+  if ( ExtractCtx->previous != NULL)
+    (ExtractCtx->previous)->next = ExtractCtx->next;
+
+  if ( ExtractCtx->next != NULL)
+    (ExtractCtx->next)->previous = ExtractCtx->previous;
+
+  if (ExtractCtx == FirstCtx)
+    FirstCtx = FirstCtx->next;
+  else
+  if (ExtractCtx == LastCtx)
+    LastCtx = LastCtx->previous;
+  
+  free(ExtractCtx);
+  NbExceptCtx --;
+  return 0;
+}
+  
+/****** Return the context of the specified Id thread *********/
+/****** If Id = -1, then return the first context     *********/
+
+
+Exception_context *GetExceptCtx ( Objects_Id Id ) {
+
+  Exception_context *ExtractCtx;
+
+  if (FirstCtx == NULL) return NULL;
+  
+  if  (Id == -1) {
+    return LastCtx;
+  }
+  
+  ExtractCtx = LastCtx;
+
+  while (ExtractCtx->id != Id && ExtractCtx != NULL) {
+    ExtractCtx = ExtractCtx->previous;
+  }
+
+  if (ExtractCtx == NULL)
+    return NULL;
+
+  return ExtractCtx;
+}