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/*
* Copyright (c) 2012-2013, 2015 ARM Limited
* Copyright (c) 2015-2016 Advanced Micro Devices, Inc.
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2003-2005 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: Steve Reinhardt
* Kevin Lim
* Brandon Potter
*/
#ifndef __SIM_SYSCALL_DESC_HH__
#define __SIM_SYSCALL_DESC_HH__
#include <functional>
#include <string>
#include "base/types.hh"
#include "sim/guest_abi.hh"
#include "sim/syscall_return.hh"
class Process;
class SyscallDesc;
class ThreadContext;
SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
ThreadContext *tc);
/**
* This class provides the wrapper interface for the system call
* implementations which are defined in the sim/syscall_emul files and
* bound to the ISAs in the architecture specific code
* (i.e. arch/X86/linux/process.cc).
*/
class SyscallDesc {
public:
using SyscallExecutor =
std::function<SyscallReturn(SyscallDesc *, int num, ThreadContext *)>;
SyscallDesc(const char *name, SyscallExecutor sys_exec=unimplementedFunc)
: _name(name), executor(sys_exec)
{}
/**
* Interface for invoking the system call funcion pointer. Note that
* this acts as a gateway for all system calls and serves a good point
* to add filters for behaviors or apply checks for all system calls.
* @param callnum Number associated with call (by operating system)
* @param proc Handle for the owning Process to pass information
* @param tc Handle for owning ThreadContext to pass information
*/
void doSyscall(int callnum, ThreadContext *tc, Fault *fault);
std::string name() { return _name; }
private:
/** System call name (e.g., open, mmap, clone, socket, etc.) */
std::string _name;
/** Mechanism for ISAs to connect to the emul function definitions */
SyscallExecutor executor;
};
/*
* This SyscallDesc subclass template adapts a given syscall implementation so
* that some arguments can come from the simulator (desc, num and tc) while the
* rest can come from the guest using the GuestABI mechanism.
*/
template <typename ABI>
class SyscallDescABI : public SyscallDesc
{
private:
// Aliases to make the code below a little more concise.
template <typename ...Args>
using SyscallABIExecutor =
std::function<SyscallReturn(SyscallDesc *, int,
ThreadContext *, Args...)>;
template <typename ...Args>
using SyscallABIExecutorPtr =
SyscallReturn (*)(SyscallDesc *, int, ThreadContext *, Args...);
// Wrap an executor with guest arguments with a normal executor that gets
// those additional arguments from the guest context.
template <typename ...Args>
static inline SyscallExecutor
buildExecutor(SyscallABIExecutor<Args...> target)
{
return [target](SyscallDesc *desc, int num,
ThreadContext *tc) -> SyscallReturn {
// Create a partial function which will stick desc and num to the
// front of the parameter list.
auto partial = [target,desc,num](
ThreadContext *tc, Args... args) -> SyscallReturn {
return target(desc, num, tc, args...);
};
// Use invokeSimcall to gather the other arguments based on the
// given ABI and pass them to the syscall implementation.
return invokeSimcall<ABI, SyscallReturn, Args...>(tc,
std::function<SyscallReturn(ThreadContext *, Args...)>(
partial));
};
}
public:
// Constructors which plumb in buildExecutor.
template <typename ...Args>
SyscallDescABI(const char *name, SyscallABIExecutor<Args...> target) :
SyscallDesc(name, buildExecutor<Args...>(target))
{}
template <typename ...Args>
SyscallDescABI(const char *name, SyscallABIExecutorPtr<Args...> target) :
SyscallDescABI(name, SyscallABIExecutor<Args...>(target))
{}
using SyscallDesc::SyscallDesc;
};
#endif // __SIM_SYSCALL_DESC_HH__
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