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

7 files changed, 276 insertions, 0 deletions

diff --git a/kern/linux/aligned.hh b/kern/linux/aligned.hh
new file mode 100644
index 000000000..55035c6e4
--- /dev/null
+++ b/kern/linux/aligned.hh
@@ -0,0 +1,21 @@
+#ifndef __ALIGNED_HH__
+#define __ALIGNED_HH__
+
+#include <stdint.h>
+#include "targetarch/isa_traits.hh"
+
+/* GCC 3.3.X has a bug in which attributes+typedefs don't work. 3.2.X is fine
+ * as in 3.4.X, but the bug is marked will not fix in 3.3.X so here is
+ * the work around.
+ */
+#if __GNUC__ == 3 && __GNUC_MINOR__  != 3
+typedef uint64_t uint64_ta __attribute__ ((aligned (8))) ;
+typedef int64_t int64_ta __attribute__ ((aligned (8))) ;
+typedef Addr Addr_a __attribute__ ((aligned (8))) ;
+#else
+#define uint64_ta uint64_t __attribute__ ((aligned (8)))
+#define int64_ta int64_t __attribute__ ((aligned (8)))
+#define Addr_a Addr __attribute__ ((aligned (8)))
+#endif /* __GNUC__ __GNUC_MINOR__ */
+
+#endif /* __ALIGNED_H__ */
diff --git a/kern/linux/hwrpb.hh b/kern/linux/hwrpb.hh
new file mode 100644
index 000000000..3ce03efd7
--- /dev/null
+++ b/kern/linux/hwrpb.hh
@@ -0,0 +1,18 @@
+#ifndef __ALPHA_HWRPB_H__
+#define __ALPHA_HWRPB_H__
+
+#include "kern/linux/aligned.hh"
+
+namespace Linux {
+    struct pcb_struct {
+        uint64_ta ksp;
+        uint64_ta usp;
+        uint64_ta ptbr;
+        uint32_t pcc;
+        uint32_t asn;
+        uint64_ta unique;
+        uint64_ta flags;
+        uint64_ta res1, res2;
+    };
+}
+#endif /* __ALPHA_HWRPB_H */
diff --git a/kern/linux/linux_system.cc b/kern/linux/linux_system.cc
index bc2753908..dd188ffe0 100644
--- a/kern/linux/linux_system.cc
+++ b/kern/linux/linux_system.cc
@@ -132,6 +132,8 @@ LinuxSystem::LinuxSystem(const string _name, const uint64_t _init_param,
 
     debugPrintkEvent = new DebugPrintkEvent(&pcEventQueue, "dprintk");
 
+    printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo");
+
     Addr addr = 0;
 
     /**
@@ -242,6 +244,10 @@ LinuxSystem::LinuxSystem(const string _name, const uint64_t _init_param,
 
     if (kernelSymtab->findAddress("dprintk", addr))
         debugPrintkEvent->schedule(addr+sizeof(MachInst)*2);
+
+    if (kernelSymtab->findAddress("alpha_switch_to", addr) &&
+            DTRACE(Thread))
+        printThreadEvent->schedule(addr+sizeof(MachInst)*6);
 }
 
 LinuxSystem::~LinuxSystem()
diff --git a/kern/linux/linux_system.hh b/kern/linux/linux_system.hh
index e7cdf140d..fbfcb788f 100644
--- a/kern/linux/linux_system.hh
+++ b/kern/linux/linux_system.hh
@@ -52,6 +52,7 @@ class LinuxSkipDelayLoopEvent;
 class SkipFuncEvent;
 class FnEvent;
 class AlphaArguments;
+class PrintThreadInfo;
 
 /**
  * This class contains linux specific system code (Loading, Events, Binning).
@@ -95,6 +96,8 @@ class LinuxSystem : public System
      */
     LinuxSkipDelayLoopEvent *skipDelayLoopEvent;
 
+    PrintThreadInfo *printThreadEvent;
+
     /** Begining of kernel code */
     Addr kernelStart;
 
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__ */
diff --git a/kern/linux/sched.hh b/kern/linux/sched.hh
new file mode 100644
index 000000000..287214b2b
--- /dev/null
+++ b/kern/linux/sched.hh
@@ -0,0 +1,110 @@
+#ifndef __LINUX_SCHED_H__
+#define __LINUX_SCHED_H__
+
+#include "targetarch/isa_traits.hh"
+#include "kern/linux/atomic.hh"
+#include "kern/linux/list.hh"
+#include "kern/linux/wait.hh"
+#include "kern/linux/timer.hh"
+#include "kern/linux/pid.hh"
+#include "kern/linux/aligned.hh"
+
+namespace Linux {
+
+    struct rlimit {
+        uint64_ta rlim_cur;
+        uint64_ta rlim_max;
+    };
+
+    const uint32_t RLIM_NLIMITS  = 11;
+
+    struct task_struct {
+        int64_ta state;    /* -1 unrunnable, 0 runnable, >0 stopped */
+        Addr_a    thread_info;
+        atomic_t usage;
+
+        uint64_ta flags;    /* per process flags, defined below */
+        uint64_ta ptrace;
+
+        int32_t lock_depth;        /* Lock depth */
+
+        int32_t prio, static_prio;
+
+        struct list_head run_list;
+        Addr_a array;
+
+        uint64_ta sleep_avg;
+        int64_ta interactive_credit;
+        uint64_ta timestamp;
+        int32_t activated;
+
+        uint64_ta policy;
+        uint64_ta cpus_allowed;
+        uint32_t time_slice, first_time_slice;
+
+        struct list_head tasks;
+        struct list_head ptrace_children;
+        struct list_head ptrace_list;
+
+        Addr_a mm, active_mm;
+
+    /* task state */
+        Addr_a binfmt;
+        int32_t exit_code, exit_signal;
+        int32_t pdeath_signal;  /*  The signal sent when the parent dies  */
+        /* ??? */
+        uint64_ta personality;
+        int32_t did_exec:1;
+        int32_t pid;
+        int32_t __pgrp;        /* Accessed via process_group() */
+        int32_t tty_old_pgrp;
+        int32_t session;
+        int32_t tgid;
+        /* boolean value for session group leader */
+        int32_t leader;
+        /*
+         * pointers to (original) parent process, youngest child, younger sibling,
+         * older sibling, respectively.  (p->father can be replaced with
+         * p->parent->pid)
+         */
+        Addr_a real_parent; /* real parent process (when being debugged) */
+        Addr_a parent;    /* parent process */
+        struct list_head children;    /* list of my children */
+        struct list_head sibling;    /* linkage in my parent's children list */
+        Addr_a group_leader;    /* threadgroup leader */
+
+        /* PID/PID hash table linkage. */
+        struct pid_link pids[PIDTYPE_MAX];
+
+        wait_queue_head_t wait_chldexit;    /* for wait4() */
+        Addr_a vfork_done;        /* for vfork() */
+        Addr_a set_child_tid;        /* CLONE_CHILD_SETTID */
+        Addr_a clear_child_tid;        /* CLONE_CHILD_CLEARTID */
+
+        uint64_ta rt_priority;
+        uint64_ta it_real_value, it_prof_value, it_virt_value;
+        uint64_ta it_real_incr, it_prof_incr, it_virt_incr;
+        struct timer_list real_timer;
+        struct list_head posix_timers; /* POSIX.1b Interval Timers */
+        uint64_ta utime, stime, cutime, cstime;
+        uint64_ta nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */
+        uint64_ta start_time;
+    /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
+        uint64_ta min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap;
+    /* process credentials */
+        uint32_t uid,euid,suid,fsuid;
+        uint32_t gid,egid,sgid,fsgid;
+        Addr_a group_info;
+        uint32_t   cap_effective, cap_inheritable, cap_permitted;
+        int32_t keep_capabilities:1;
+        Addr user;
+    /* limits */
+        struct rlimit rlim[RLIM_NLIMITS];
+        uint16_t used_math;
+        char comm[16];
+    };
+
+
+}
+
+#endif
diff --git a/kern/linux/thread_info.hh b/kern/linux/thread_info.hh
new file mode 100644
index 000000000..1b4053a78
--- /dev/null
+++ b/kern/linux/thread_info.hh
@@ -0,0 +1,27 @@
+#ifndef __ALPHA_THREAD_INFO_H__
+#define __ALPHA_THREAD_INFO_H__
+
+#include "kern/linux/hwrpb.hh"
+#include "kern/linux/aligned.hh"
+
+namespace Linux {
+    struct thread_info {
+        struct pcb_struct       pcb;            /* palcode state */
+
+        Addr_a                  task;          /* main task structure */
+        uint32_t                flags;          /* low level flags */
+        uint32_t                ieee_state;     /* see fpu.h */
+
+        Addr_a                   exec_domain;   /* execution domain */
+        uint64_ta                addr_limit;     /* thread address space */
+        int64_ta                 cpu;            /* current CPU */
+        int32_t                  preempt_count;  /* 0 => preemptable, <0 => BUG */
+
+        int32_t                  bpt_nsaved;
+        uint64_ta                bpt_addr[2];    /* breakpoint handling  */
+        uint32_t                 bpt_insn[2];
+
+        /*restart_block;*/
+    };
+}
+#endif /* __ALPHA_THREAD_INFO_H__ */