src/arch/alpha/linux/threadinfo.hh

   1 /*
   2  * Copyright (c) 2004 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Ali Saidi
  29  *          Nathan Binkert
  30  */
  31
  32 #ifndef __ARCH_ALPHA_LINUX_LINUX_TREADNIFO_HH__
  33 #define __ARCH_ALPHA_LINUX_LINUX_TREADNIFO_HH__
  34
  35 #include "cpu/thread_context.hh"
  36 #include "sim/system.hh"
  37 #include "sim/vptr.hh"
  38
  39 namespace Linux {
  40
  41 class ThreadInfo
  42 {
  43   private:
  44     ThreadContext *tc;
  45     System *sys;
  46     Addr pcbb;
  47
  48     template <typename T>
  49     bool
  50     get_data(const char *symbol, T &data)
  51     {
  52         Addr addr = 0;
  53         if (!sys->kernelSymtab->findAddress(symbol, addr))
  54             return false;
  55
  56         CopyOut(tc, &data, addr, sizeof(T));
  57
  58         data = AlphaISA::gtoh(data);
  59
  60         return true;
  61     }
  62
  63   public:
  64     ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
  65         : tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
  66     {
  67
  68     }
  69     ~ThreadInfo()
  70     {}
  71
  72     inline Addr
  73     curThreadInfo()
  74     {
  75         Addr addr = pcbb;
  76         Addr sp;
  77
  78         if (!addr)
  79             addr = tc->readMiscRegNoEffect(AlphaISA::IPR_PALtemp23);
  80
  81         FunctionalPort *p = tc->getPhysPort();
  82         p->readBlob(addr, (uint8_t *)&sp, sizeof(Addr));
  83
  84         return sp & ~ULL(0x3fff);
  85     }
  86
  87     inline Addr
  88     curTaskInfo(Addr thread_info = 0)
  89     {
  90         int32_t offset;
  91         if (!get_data("thread_info_task", offset))
  92             return 0;
  93
  94         if (!thread_info)
  95             thread_info = curThreadInfo();
  96
  97         Addr addr;
  98         CopyOut(tc, &addr, thread_info + offset, sizeof(addr));
  99
 100         return addr;
 101     }
 102
 103     int32_t
 104     curTaskPID(Addr thread_info = 0)
 105     {
 106         Addr offset;
 107         if (!get_data("task_struct_pid", offset))
 108             return -1;
 109
 110         int32_t pid;
 111         CopyOut(tc, &pid, curTaskInfo(thread_info) + offset, sizeof(pid));
 112
 113         return pid;
 114     }
 115
 116     int64_t
 117     curTaskStart(Addr thread_info = 0)
 118     {
 119         Addr offset;
 120         if (!get_data("task_struct_start_time", offset))
 121             return -1;
 122
 123         int64_t data;
 124         // start_time is actually of type timespec, but if we just
 125         // grab the first long, we'll get the seconds out of it
 126         CopyOut(tc, &data, curTaskInfo(thread_info) + offset, sizeof(data));
 127
 128         return data;
 129     }
 130
 131     std::string
 132     curTaskName(Addr thread_info = 0)
 133     {
 134         int32_t offset;
 135         int32_t size;
 136
 137         if (!get_data("task_struct_comm", offset))
 138             return "FailureIn_curTaskName";
 139
 140         if (!get_data("task_struct_comm_size", size))
 141             return "FailureIn_curTaskName";
 142
 143         char buffer[size + 1];
 144         CopyStringOut(tc, buffer, curTaskInfo(thread_info) + offset, size);
 145
 146         return buffer;
 147     }
 148 };
 149
 150 } // namespace Linux
 151
 152 #endif // __ARCH_ALPHA_LINUX_LINUX_THREADINFO_HH__