1 files changed, 139 insertions, 0 deletions
diff --git a/src/sim/debug.cc b/src/sim/debug.cc
new file mode 100644
index 000000000..b82219f7d
--- /dev/null
+++ b/src/sim/debug.cc
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2003-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Nathan Binkert
+ *          Steve Reinhardt
+ */
+
+#include <sys/types.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include "sim/debug.hh"
+#include "sim/eventq.hh"
+#include "sim/param.hh"
+#include "sim/sim_events.hh"
+
+using namespace std;
+
+void
+debug_break()
+{
+#ifndef NDEBUG
+    kill(getpid(), SIGTRAP);
+#else
+    cprintf("debug_break suppressed, compiled with NDEBUG\n");
+#endif
+}
+
+//
+// Debug event: place a breakpoint on the process function and
+// schedule the event to break at a particular cycle
+//
+class DebugBreakEvent : public Event
+{
+  public:
+
+    DebugBreakEvent(EventQueue *q, Tick _when);
+
+    void process();	// process event
+    virtual const char *description();
+};
+
+//
+// constructor: schedule at specified time
+//
+DebugBreakEvent::DebugBreakEvent(EventQueue *q, Tick _when)
+    : Event(q, Debug_Break_Pri)
+{
+    setFlags(AutoDelete);
+    schedule(_when);
+}
+
+//
+// handle debug event: set debugger breakpoint on this function
+//
+void
+DebugBreakEvent::process()
+{
+    debug_break();
+}
+
+
+const char *
+DebugBreakEvent::description()
+{
+    return "debug break";
+}
+
+//
+// Parameter context for global debug options
+//
+class DebugContext : public ParamContext
+{
+  public:
+    DebugContext(const string &_iniSection)
+        : ParamContext(_iniSection) {}
+    void checkParams();
+};
+
+DebugContext debugParams("debug");
+
+VectorParam<Tick> break_cycles(&debugParams, "break_cycles",
+                                 "cycle(s) to create breakpoint events");
+
+void
+DebugContext::checkParams()
+{
+    if (break_cycles.isValid()) {
+        vector<Tick> &cycles = break_cycles;
+
+        vector<Tick>::iterator i = cycles.begin();
+        vector<Tick>::iterator end = cycles.end();
+
+        for (; i < end; ++i)
+            new DebugBreakEvent(&mainEventQueue, *i);
+    }
+}
+
+//
+// handy function to schedule DebugBreakEvent on main event queue
+// (callable from debugger)
+//
+extern "C" void sched_break_cycle(Tick when)
+{
+    new DebugBreakEvent(&mainEventQueue, when);
+}
+
+extern "C" void eventq_dump()
+{
+    mainEventQueue.dump();
+}
+