1ced08c850
The class was crammed into syscall_emul.hh which has tons of forward declarations and template definitions. To clean it up a bit, moved the class into separate files and commented the class with doxygen style comments. Also, provided some encapsulation by adding some accessors and a mutator. The syscallreturn.hh file was renamed syscall_return.hh to make it consistent with other similarly named files in the src/sim directory. The DPRINTF_SYSCALL macro was moved into its own header file with the include the Base and Verbose flags as well. --HG-- rename : src/sim/syscallreturn.hh => src/sim/syscall_return.hh
89 lines
3.4 KiB
C++
89 lines
3.4 KiB
C++
/*
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* Copyright (c) 2016 Advanced Micro Devices, Inc.
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* Copyright (c) 2003-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Steve Reinhardt
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* Ali Saidi
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* Brandon Potter
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*/
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#include "sim/syscall_desc.hh"
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#include "base/trace.hh"
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#include "config/the_isa.hh"
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#include "cpu/base.hh"
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#include "cpu/thread_context.hh"
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#include "sim/process.hh"
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#include "sim/syscall_debug_macros.hh"
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#include "sim/syscall_return.hh"
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void
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SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc)
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{
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TheISA::IntReg arg[6] M5_VAR_USED;
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/**
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* Step through the first six parameters for the system call and
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* retrieve their values. Note that index is incremented as a
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* side-effect of the calling method.
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*/
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for (int index = 0; index < 6; )
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arg[index] = process->getSyscallArg(tc, index);
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/**
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* Linux supports up to six system call arguments through registers
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* so we want to print all six. Check to the relevant man page to
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* verify how many are actually used by a given system call.
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*/
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DPRINTF_SYSCALL(Base, "%s called w/arguments %d, %d, %d, %d, %d, %d\n",
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_name, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5]);
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/** Invoke the system call */
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SyscallReturn retval = (*executor)(this, callnum, process, tc);
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/**
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* If the system call needs to be restarted, most likely due to
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* blocking behavior, warn that the system call will retry;
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* alternatively, print the return value.
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*/
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if (retval.needsRetry())
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DPRINTF_SYSCALL(Base, "%s needs retry\n", _name);
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else
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DPRINTF_SYSCALL(Base, "%s returns %d\n", _name, retval.encodedValue());
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if (!(_flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry())
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process->setSyscallReturn(tc, retval);
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}
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bool
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SyscallDesc::needWarning()
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{
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bool suppress_warning = warnOnce() && _warned;
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_warned = true;
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return !suppress_warning;
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}
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