Added code using VPtr to be able to extract info from linux thread

structures.
Added event to print out currently running task

base/traceflags.py:
    Added Thread trace flag
kern/linux/linux_system.cc:
kern/linux/linux_system.hh:
    Added event to print out currently running task

--HG--
extra : convert_revision : 94347dbaf90f39eb40467b2a43b4628a3deafc6c

1 files changed, 91 insertions, 0 deletions

diff --git a/kern/linux/linux_threadinfo.hh b/kern/linux/linux_threadinfo.hh
new file mode 100644
index 000000000..83a746059
--- /dev/null
+++ b/kern/linux/linux_threadinfo.hh
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2004 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.
+ */
+
+#ifndef __LINUX_TREADNIFO_HH__
+#define __LINUX_TREADNIFO_HH__
+
+
+#include "targetarch/isa_traits.hh"
+#include "targetarch/vptr.hh"
+#include "cpu/exec_context.hh"
+#include "kern/linux/thread_info.hh"
+#include "kern/linux/sched.hh"
+
+
+namespace Linux {
+
+class ThreadInfo
+{
+    private:
+        ExecContext *xc;
+
+    public:
+        ThreadInfo(ExecContext *exec) : xc(exec) {}
+        ~ThreadInfo() {}
+
+        inline VPtr<thread_info>
+        curThreadInfo()
+        {
+            Addr current;
+
+            /* Each kernel stack is only 2 pages, the start of which is the
+             * thread_info struct. So we can get the address by masking off
+             * the lower 14 bits.
+             */
+            current = xc->regs.intRegFile[StackPointerReg] & ~0x3fff;
+            return VPtr<thread_info>(xc, current);
+        }
+
+        inline VPtr<task_struct>
+        curTaskInfo()
+        {
+            Addr task = curThreadInfo()->task;
+            return VPtr<task_struct>(xc, task);
+        }
+
+        string
+        curTaskName()
+        {
+            return curTaskInfo()->comm;
+        }
+
+        int32_t
+        curTaskPID()
+        {
+            return curTaskInfo()->pid;
+        }
+
+        uint64_t
+        curTaskStart()
+        {
+            return curTaskInfo()->start_time;
+        }
+};
+}
+
+#endif /* __LINUX_THREADINFO_HH__ */