ISA: generic Linux thread info support

This patch takes the Linux thread info support scattered across
different ISA implementations (currently in ARM, ALPHA, and MIPS), and
unifies them into a single file.

Adds a few more helper functions to read out TGID, mm, etc.

ISA-specific information (e.g., ALPHA PCBB register) is now moved to
the corresponding isa_traits.hh files.

src/arch/alpha/isa_traits.hh

@@ -34,6 +34,7 @@
 
 namespace LittleEndianGuest {}
 
+#include "arch/alpha/ipr.hh"
 #include "arch/alpha/types.hh"
 #include "base/types.hh"
 #include "cpu/static_inst_fwd.hh"
@@ -129,6 +130,9 @@ const ExtMachInst NoopMachInst = 0x2ffe0000;
 // Memory accesses cannot be unaligned
 const bool HasUnalignedMemAcc = false;
 
+const bool CurThreadInfoImplemented = true;
+const int CurThreadInfoReg = AlphaISA::IPR_PALtemp23;
+
 } // namespace AlphaISA
 
 #endif // __ARCH_ALPHA_ISA_TRAITS_HH__

src/arch/alpha/kernel_stats.cc

@@ -33,7 +33,7 @@
 #include <stack>
 #include <string>
 
-#include "arch/alpha/linux/threadinfo.hh"
+#include "arch/generic/linux/threadinfo.hh"
 #include "arch/alpha/kernel_stats.hh"
 #include "arch/alpha/osfpal.hh"
 #include "base/trace.hh"

src/arch/alpha/linux/system.cc

@@ -41,9 +41,9 @@
  */
 
 #include "arch/alpha/linux/system.hh"
-#include "arch/alpha/linux/threadinfo.hh"
 #include "arch/alpha/idle_event.hh"
 #include "arch/alpha/system.hh"
+#include "arch/generic/linux/threadinfo.hh"
 #include "arch/vtophys.hh"
 #include "base/loader/symtab.hh"
 #include "cpu/base.hh"

src/arch/arm/isa_traits.hh

@@ -114,6 +114,9 @@ namespace ArmISA
     // Memory accesses cannot be unaligned
     const bool HasUnalignedMemAcc = true;
 
+    const bool CurThreadInfoImplemented = false;
+    const int CurThreadInfoReg = -1;
+
     enum InterruptTypes
     {
         INT_RST,

src/arch/generic/linux/threadinfo.hh

@@ -27,10 +27,11 @@
  *
  * Authors: Ali Saidi
  *          Nathan Binkert
+ *          Dam Sunwoo
  */
 
-#ifndef __ARCH_ALPHA_LINUX_LINUX_TREADNIFO_HH__
+#ifndef __ARCH_GENERIC_LINUX_THREADINFO_HH__
-#define __ARCH_ALPHA_LINUX_LINUX_TREADNIFO_HH__
+#define __ARCH_GENERIC_LINUX_THREADINFO_HH__
 
 #include "cpu/thread_context.hh"
 #include "sim/system.hh"
@@ -50,12 +51,16 @@ class ThreadInfo
     get_data(const char *symbol, T &data)
     {
         Addr addr = 0;
-        if (!sys->kernelSymtab->findAddress(symbol, addr))
+        if (!sys->kernelSymtab->findAddress(symbol, addr)) {
+            warn_once("Unable to find kernel symbol %s\n", symbol);
+            warn_once("Kernel not compiled with task_struct info; can't get "
+                      "currently executing task/process/thread name/ids!\n");
             return false;
+        }
 
         CopyOut(tc, &data, addr, sizeof(T));
 
-        data = AlphaISA::gtoh(data);
+        data = TheISA::gtoh(data);
 
         return true;
     }
@@ -72,11 +77,14 @@ class ThreadInfo
     inline Addr
     curThreadInfo()
     {
+        if (!TheISA::CurThreadInfoImplemented)
+            panic("curThreadInfo() not implemented for this ISA");
+
         Addr addr = pcbb;
         Addr sp;
 
         if (!addr)
-            addr = tc->readMiscRegNoEffect(AlphaISA::IPR_PALtemp23);
+            addr = tc->readMiscRegNoEffect(TheISA::CurThreadInfoReg);
 
         PortProxy &p = tc->getPhysProxy();
         p.readBlob(addr, (uint8_t *)&sp, sizeof(Addr));
@@ -113,6 +121,19 @@ class ThreadInfo
         return pid;
     }
 
+    int32_t
+    curTaskTGID(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_tgid", offset))
+            return -1;
+
+        int32_t tgid;
+        CopyOut(tc, &tgid, curTaskInfo(thread_info) + offset, sizeof(tgid));
+
+        return tgid;
+    }
+
     int64_t
     curTaskStart(Addr thread_info = 0)
     {
@@ -145,8 +166,21 @@ class ThreadInfo
 
         return buffer;
     }
+
+    int32_t
+    curTaskMm(Addr thread_info = 0)
+    {
+        int32_t offset;
+        if (!get_data("task_struct_mm", offset))
+            return -1;
+
+        int32_t mm_ptr;
+        CopyOut(tc, &mm_ptr, curTaskInfo(thread_info) + offset, sizeof(mm_ptr));
+
+        return mm_ptr;
+    }
 };
 
 } // namespace Linux
 
-#endif // __ARCH_ALPHA_LINUX_LINUX_THREADINFO_HH__
+#endif // __ARCH_GENERIC_LINUX_THREADINFO_HH__

src/arch/mips/isa_traits.hh

@@ -160,6 +160,9 @@ const uint32_t ITOUCH_ANNOTE = 0xffffffff;
 
 const bool HasUnalignedMemAcc = true;
 
+const bool CurThreadInfoImplemented = false;
+const int CurThreadInfoReg = -1;
+
 } // namespace MipsISA
 
 #endif // __ARCH_MIPS_ISA_TRAITS_HH__

src/arch/mips/linux/system.cc

@@ -39,8 +39,8 @@
  * up boot time.
  */
 
+#include "arch/generic/linux/threadinfo.hh"
 #include "arch/mips/linux/system.hh"
-#include "arch/mips/linux/threadinfo.hh"
 #include "arch/mips/idle_event.hh"
 #include "arch/mips/system.hh"
 #include "arch/vtophys.hh"

src/arch/mips/linux/threadinfo.hh

@@ -1,153 +0,0 @@
-/*
- * 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.
- *
- * Authors: Ali Saidi
- *          Nathan Binkert
- */
-
-#ifndef __ARCH_MIPS_LINUX_LINUX_TREADNIFO_HH__
-#define __ARCH_MIPS_LINUX_LINUX_TREADNIFO_HH__
-
-#include "cpu/thread_context.hh"
-#include "sim/system.hh"
-#include "sim/vptr.hh"
-
-namespace Linux {
-
-class ThreadInfo
-{
-  private:
-    ThreadContext *tc;
-    System *sys;
-    Addr pcbb;
-
-    template <typename T>
-    bool
-    get_data(const char *symbol, T &data)
-    {
-        Addr addr = 0;
-        if (!sys->kernelSymtab->findAddress(symbol, addr))
-            return false;
-
-        CopyOut(tc, &data, addr, sizeof(T));
-
-        data = MipsISA::gtoh(data);
-
-        return true;
-    }
-
-  public:
-    ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
-        : tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
-    {
-
-    }
-    ~ThreadInfo()
-    {}
-
-    inline Addr
-    curThreadInfo()
-    {
-        panic("curThreadInfo not implemented for MIPS");
-        Addr addr = pcbb;
-        Addr sp;
-
-        if (!addr)
-            addr = tc->readMiscRegNoEffect(0/*MipsISA::IPR_PALtemp23*/);
-
-        PortProxy &p = tc->getPhysProxy();
-        p.readBlob(addr, (uint8_t *)&sp, sizeof(Addr));
-
-        return sp & ~ULL(0x3fff);
-    }
-
-    inline Addr
-    curTaskInfo(Addr thread_info = 0)
-    {
-        int32_t offset;
-        if (!get_data("thread_info_task", offset))
-            return 0;
-
-        if (!thread_info)
-            thread_info = curThreadInfo();
-
-        Addr addr;
-        CopyOut(tc, &addr, thread_info + offset, sizeof(addr));
-
-        return addr;
-    }
-
-    int32_t
-    curTaskPID(Addr thread_info = 0)
-    {
-        Addr offset;
-        if (!get_data("task_struct_pid", offset))
-            return -1;
-
-        int32_t pid;
-        CopyOut(tc, &pid, curTaskInfo(thread_info) + offset, sizeof(pid));
-
-        return pid;
-    }
-
-    int64_t
-    curTaskStart(Addr thread_info = 0)
-    {
-        Addr offset;
-        if (!get_data("task_struct_start_time", offset))
-            return -1;
-
-        int64_t data;
-        // start_time is actually of type timespec, but if we just
-        // grab the first long, we'll get the seconds out of it
-        CopyOut(tc, &data, curTaskInfo(thread_info) + offset, sizeof(data));
-
-        return data;
-    }
-
-    std::string
-    curTaskName(Addr thread_info = 0)
-    {
-        int32_t offset;
-        int32_t size;
-
-        if (!get_data("task_struct_comm", offset))
-            return "FailureIn_curTaskName";
-
-        if (!get_data("task_struct_comm_size", size))
-            return "FailureIn_curTaskName";
-
-        char buffer[size + 1];
-        CopyStringOut(tc, buffer, curTaskInfo(thread_info) + offset, size);
-
-        return buffer;
-    }
-};
-
-} // namespace Linux
-
-#endif // __ARCH_MIPS_LINUX_LINUX_THREADINFO_HH__

src/arch/power/isa_traits.hh

@@ -72,6 +72,9 @@ const ExtMachInst NoopMachInst = 0x60000000;
 // Memory accesses can be unaligned
 const bool HasUnalignedMemAcc = true;
 
+const bool CurThreadInfoImplemented = false;
+const int CurThreadInfoReg = -1;
+
 } // namespace PowerISA
 
 #endif // __ARCH_POWER_ISA_TRAITS_HH__

src/arch/sparc/isa_traits.hh

@@ -91,6 +91,10 @@ enum InterruptTypes
 
 // Memory accesses cannot be unaligned
 const bool HasUnalignedMemAcc = false;
+
+const bool CurThreadInfoImplemented = false;
+const int CurThreadInfoReg = -1;
+
 }
 
 #endif // __ARCH_SPARC_ISA_TRAITS_HH__

src/arch/x86/isa_traits.hh

@@ -71,6 +71,9 @@ namespace X86ISA
     // Memory accesses can be unaligned
     const bool HasUnalignedMemAcc = true;
 
+    const bool CurThreadInfoImplemented = false;
+    const int CurThreadInfoReg = -1;
+
     const ExtMachInst NoopMachInst = {
         0x0,                            // No legacy prefixes.
         0x0,                            // No rex prefix.