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/*
* 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
* Dam Sunwoo
*/
#ifndef __ARCH_GENERIC_LINUX_THREADINFO_HH__
#define __ARCH_GENERIC_LINUX_THREADINFO_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)) {
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 = TheISA::gtoh(data);
return true;
}
public:
ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
: tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
{
}
~ThreadInfo()
{}
inline Addr
curThreadInfo()
{
if (!TheISA::CurThreadInfoImplemented)
panic("curThreadInfo() not implemented for this ISA");
Addr addr = pcbb;
Addr sp;
if (!addr)
addr = tc->readMiscRegNoEffect(TheISA::CurThreadInfoReg);
PortProxy &p = tc->getPhysProxy();
p.readBlob(addr, (uint8_t *)&sp, sizeof(Addr));
return sp & ~ULL(0x3fff);
}
inline Addr
curTaskInfo(Addr thread_info = 0)
{
// Note that in Linux 4.10 the thread_info struct will no longer have a
// pointer to the task_struct for arm64. See:
// https://patchwork.kernel.org/patch/9333699/
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
curTaskPIDFromTaskStruct(Addr task_struct) {
int32_t offset;
if (!get_data("task_struct_pid", offset))
return -1;
int32_t pid;
CopyOut(tc, &pid, task_struct + offset, sizeof(pid));
return pid;
}
int32_t
curTaskPID(Addr thread_info = 0)
{
return curTaskPIDFromTaskStruct(curTaskInfo(thread_info));
}
int32_t
curTaskTGIDFromTaskStruct(Addr task_struct)
{
int32_t offset;
if (!get_data("task_struct_tgid", offset))
return -1;
int32_t tgid;
CopyOut(tc, &tgid, task_struct + offset, sizeof(tgid));
return tgid;
}
int32_t
curTaskTGID(Addr thread_info = 0)
{
return curTaskTGIDFromTaskStruct(curTaskInfo(thread_info));
}
int64_t
curTaskStartFromTaskStruct(Addr task_struct)
{
int32_t 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, task_struct + offset, sizeof(data));
return data;
}
int64_t
curTaskStart(Addr thread_info = 0)
{
return curTaskStartFromTaskStruct(curTaskInfo(thread_info));
}
std::string
curTaskNameFromTaskStruct(Addr task_struct)
{
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, task_struct + offset, size);
return buffer;
}
std::string
curTaskName(Addr thread_info = 0)
{
return curTaskNameFromTaskStruct(curTaskInfo(thread_info));
}
int32_t
curTaskMmFromTaskStruct(Addr task_struct)
{
int32_t offset;
if (!get_data("task_struct_mm", offset))
return -1;
int32_t mm_ptr;
CopyOut(tc, &mm_ptr, task_struct + offset, sizeof(mm_ptr));
return mm_ptr;
}
int32_t
curTaskMm(Addr thread_info = 0)
{
return curTaskMmFromTaskStruct(curTaskInfo(thread_info));
}
};
} // namespace Linux
#endif // __ARCH_GENERIC_LINUX_THREADINFO_HH__
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