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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 "base/trace.hh"
+#include "config/the_isa.hh"
+#include "cpu/base.hh"
+#include "cpu/thread_context.hh"
+#include "sim/process.hh"
+#include "sim/syscall_debug_macros.hh"
+#include "sim/syscall_return.hh"
+
+void
+SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc)
+{
+ TheISA::IntReg arg[6] M5_VAR_USED;
+
+ /**
+ * 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 calling method.
+ */
+ for (int index = 0; index < 6; )
+ arg[index] = 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, process, 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())
+ 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;
+}