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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 <string>
class Process;
class SyscallReturn;
class ThreadContext;
/**
* 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:
/** Typedef the function pointer here to clean up code below */
typedef SyscallReturn (*SyscallExecutor)(SyscallDesc*, int num,
Process*, ThreadContext*);
SyscallDesc(const char *name, SyscallExecutor sys_exec, int flags = 0)
: _name(name), executor(sys_exec), _flags(flags), _warned(false)
{
}
/** Provide a mechanism to specify behavior for abnormal system calls */
enum Flags {
/**
* Do not set return registers according to executor return value.
* Used for system calls with non-standard return conventions that
* explicitly set the thread context regs (e.g., sigreturn, clone)
*/
SuppressReturnValue = 1,
/** Warn only once for unimplemented system calls */
WarnOnce = 2
/* X2 = 4, // Remove these comments when the next field is added; */
/* X3 = 8, // point is to make it obvious that this defines vector */
};
/**
* 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, Process *proc, ThreadContext *tc);
/**
* Return false if WarnOnce is set and a warning has already been issued.
* Otherwise, return true. Updates state as a side effect to help
* keep track of issued warnings.
*/
bool needWarning();
bool warnOnce() const { return (_flags & WarnOnce); }
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;
/**
* Holds values set with the preceding enum; note that this has been
* used primarily for features that are mutually exclusive, but there's
* no reason that this needs to be true going forward.
*/
int _flags;
/** Set if WarnOnce is specified in flags AFTER first call */
bool _warned;
};
#endif // __SIM_SYSCALL_DESC_HH__
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