isa_traits.hh revision 2665:a124942bacb8 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 *          Gabe Black
30 */
31
32#ifndef __ARCH_ALPHA_ISA_TRAITS_HH__
33#define __ARCH_ALPHA_ISA_TRAITS_HH__
34
35namespace LittleEndianGuest {}
36
37#include "arch/alpha/types.hh"
38#include "arch/alpha/constants.hh"
39#include "arch/alpha/regfile.hh"
40#include "config/full_system.hh"
41#include "sim/host.hh"
42
43class StaticInstPtr;
44
45#if !FULL_SYSTEM
46class SyscallReturn {
47        public:
48           template <class T>
49           SyscallReturn(T v, bool s)
50           {
51               retval = (uint64_t)v;
52               success = s;
53           }
54
55           template <class T>
56           SyscallReturn(T v)
57           {
58               success = (v >= 0);
59               retval = (uint64_t)v;
60           }
61
62           ~SyscallReturn() {}
63
64           SyscallReturn& operator=(const SyscallReturn& s) {
65               retval = s.retval;
66               success = s.success;
67               return *this;
68           }
69
70           bool successful() { return success; }
71           uint64_t value() { return retval; }
72
73
74       private:
75           uint64_t retval;
76           bool success;
77};
78
79#endif
80
81#if FULL_SYSTEM
82#include "arch/alpha/isa_fullsys_traits.hh"
83#endif
84
85
86namespace AlphaISA
87{
88
89using namespace LittleEndianGuest;
90
91// redirected register map, really only used for the full system case.
92extern const int reg_redir[NumIntRegs];
93
94    StaticInstPtr decodeInst(ExtMachInst);
95
96#if !FULL_SYSTEM
97    static inline void setSyscallReturn(SyscallReturn return_value, RegFile *regs)
98    {
99        // check for error condition.  Alpha syscall convention is to
100        // indicate success/failure in reg a3 (r19) and put the
101        // return value itself in the standard return value reg (v0).
102        if (return_value.successful()) {
103            // no error
104            regs->setIntReg(SyscallSuccessReg, 0);
105            regs->setIntReg(ReturnValueReg, return_value.value());
106        } else {
107            // got an error, return details
108            regs->setIntReg(SyscallSuccessReg, (IntReg)-1);
109            regs->setIntReg(ReturnValueReg, -return_value.value());
110        }
111    }
112#endif
113};
114
115#endif // __ARCH_ALPHA_ISA_TRAITS_HH__
116