cf0f625b47
These types are IntReg, FloatReg, FloatRegBits, and MiscReg. There are some remaining types, specifically the vector registers and the CCReg. I'm less familiar with these new types of registers, and so will look at getting rid of them at some later time. Change-Id: Ide8f76b15c531286f61427330053b44074b8ac9b Reviewed-on: https://gem5-review.googlesource.com/c/13624 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>
96 lines
3.6 KiB
C++
96 lines
3.6 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 <memory>
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#include "base/trace.hh"
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#include "base/types.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/faults.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, Process *process, ThreadContext *tc,
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Fault *fault)
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{
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RegVal 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 getSyscallArg method.
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*/
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int index = 0;
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for (int i = 0; i < 6; i++)
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arg[i] = 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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*fault = std::make_shared<SyscallRetryFault>();
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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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