88 lines
3 KiB
C++
88 lines
3 KiB
C++
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/*
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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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* Gabe Black
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*/
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#ifndef __ARCH_ALPHA_SYSCALLRETURN_HH__
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#define __ARCH_ALPHA_SYSCALLRETURN_HH__
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class SyscallReturn {
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public:
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template <class T>
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SyscallReturn(T v, bool s)
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{
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retval = (uint64_t)v;
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success = s;
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}
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template <class T>
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SyscallReturn(T v)
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{
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success = (v >= 0);
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retval = (uint64_t)v;
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}
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~SyscallReturn() {}
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SyscallReturn& operator=(const SyscallReturn& s) {
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retval = s.retval;
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success = s.success;
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return *this;
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}
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bool successful() { return success; }
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uint64_t value() { return retval; }
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private:
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uint64_t retval;
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bool success;
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};
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namespace AlphaISA
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{
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static inline void setSyscallReturn(SyscallReturn return_value, RegFile *regs)
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{
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// check for error condition. Alpha syscall convention is to
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// indicate success/failure in reg a3 (r19) and put the
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// return value itself in the standard return value reg (v0).
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if (return_value.successful()) {
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// no error
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regs->setIntReg(SyscallSuccessReg, 0);
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regs->setIntReg(ReturnValueReg, return_value.value());
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} else {
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// got an error, return details
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regs->setIntReg(SyscallSuccessReg, (IntReg)-1);
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regs->setIntReg(ReturnValueReg, -return_value.value());
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}
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}
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}
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#endif
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