utility.cc revision 4826:259b996a6da6 
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: Gabe Black
29 *          Ali Saidi
30 */
31
32#include "arch/sparc/utility.hh"
33#if FULL_SYSTEM
34#include "arch/sparc/vtophys.hh"
35#include "mem/vport.hh"
36#endif
37
38namespace SparcISA {
39
40
41//The caller uses %o0-%05 for the first 6 arguments even if their floating
42//point. Double precision floating point values take two registers/args.
43//Quads, structs, and unions are passed as pointers. All arguments beyond
44//the sixth are passed on the stack past the 16 word window save area,
45//space for the struct/union return pointer, and space reserved for the
46//first 6 arguments which the caller may use but doesn't have to.
47uint64_t getArgument(ThreadContext *tc, int number, bool fp) {
48#if FULL_SYSTEM
49    if (number < NumArgumentRegs) {
50        return tc->readIntReg(ArgumentReg[number]);
51    } else {
52        Addr sp = tc->readIntReg(StackPointerReg);
53        VirtualPort *vp = tc->getVirtPort(tc);
54        uint64_t arg = vp->read<uint64_t>(sp + 92 +
55                            (number-NumArgumentRegs) * sizeof(uint64_t));
56        tc->delVirtPort(vp);
57        return arg;
58    }
59#else
60    panic("getArgument() only implemented for FULL_SYSTEM\n");
61    M5_DUMMY_RETURN
62#endif
63}
64} //namespace SPARC_ISA
65