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/*
* Copyright (c) 2016 Advanced Micro Devices, Inc.
* 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
* Ali Saidi
* Brandon Potter
*/
#include "sim/syscall_desc.hh"
#include <memory>
#include "base/trace.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "sim/faults.hh"
#include "sim/process.hh"
#include "sim/syscall_debug_macros.hh"
#include "sim/syscall_return.hh"
void
SyscallDesc::doSyscall(int callnum, ThreadContext *tc, Fault *fault)
{
RegVal arg[6] M5_VAR_USED;
auto process = tc->getProcessPtr();
/**
* Step through the first six parameters for the system call and
* retrieve their values. Note that index is incremented as a
* side-effect of the getSyscallArg method.
*/
int index = 0;
for (int i = 0; i < 6; i++)
arg[i] = process->getSyscallArg(tc, index);
/**
* Linux supports up to six system call arguments through registers
* so we want to print all six. Check to the relevant man page to
* verify how many are actually used by a given system call.
*/
DPRINTF_SYSCALL(Base, "%s called w/arguments %d, %d, %d, %d, %d, %d\n",
_name, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5]);
/** Invoke the system call */
SyscallReturn retval = (*executor)(this, callnum, tc);
/**
* If the system call needs to be restarted, most likely due to
* blocking behavior, warn that the system call will retry;
* alternatively, print the return value.
*/
if (retval.needsRetry()) {
*fault = std::make_shared<SyscallRetryFault>();
DPRINTF_SYSCALL(Base, "%s needs retry\n", _name);
} else
DPRINTF_SYSCALL(Base, "%s returns %d\n", _name, retval.encodedValue());
if (!(_flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry())
process->setSyscallReturn(tc, retval);
}
bool
SyscallDesc::needWarning()
{
bool suppress_warning = warnOnce() && _warned;
_warned = true;
return !suppress_warning;
}
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