Hello Sven,
>> Could you please make core at least a little more verbose at this point?
coming back to the exception topic, here is a simple solution, which
reports occurred exceptions as a log message. The patch hasn't made it
into the last release but if it works for you, I'll commit it to the SVN.
Norman
Index: base-okl4/src/core/platform_thread.cc
===================================================================
--- base-okl4/src/core/platform_thread.cc (revision 127)
+++ base-okl4/src/core/platform_thread.cc (working copy)
@@ -56,7 +56,7 @@
L4_SpaceId_t space_id = L4_SpaceId(space_no);
L4_ThreadId_t scheduler = L4_rootserver;
L4_ThreadId_t pager = _pager ? _pager->cap().tid() : L4_nilthread;
- L4_ThreadId_t exception_handler = L4_rootserver;
+ L4_ThreadId_t exception_handler = pager;
L4_Word_t resources = 0;
L4_Word_t utcb_size_per_task = L4_GetUtcbSize()*(1 << Platform_pd::THREAD_BITS);
L4_Word_t utcb_location = platform_specific()->utcb_base()
Index: base-okl4/src/base/ipc/pager.cc
===================================================================
--- base-okl4/src/base/ipc/pager.cc (revision 127)
+++ base-okl4/src/base/ipc/pager.cc (working copy)
@@ -82,8 +82,30 @@
void Ipc_pager::wait_for_page_fault()
{
- /* wait for page fault */
- L4_MsgTag_t faulter_tag = L4_Wait(&_last);
+ L4_MsgTag_t faulter_tag;
+
+ for (;;) {
+
+ /* wait for page fault */
+ faulter_tag = L4_Wait(&_last);
+
+ /*
+ * A page-fault message has one of the op bits (lower 3 bits of the
+ * label) set. If those bits are zero, we got an exception message.
+ */
+ bool is_exception = (L4_Label(faulter_tag) & 0xf) == 0;
+
+ if (!is_exception) break;
+
+ /*
+ * Print diagnostic message and wait again.
+ */
+ addr_t ip = 0;
+ L4_StoreMR(1, &ip);
+ PERR("Exception (label 0x%x) occured in space %d at IP 0x%p",
+ (int)L4_Label(faulter_tag), (int)L4_SenderSpace().raw, (void *)ip);
+ }
+
_last_space = L4_SenderSpace();
/* read fault information */
------------------------------------------------------------------------------
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