utility.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 65 行

/*
 * Copyright (c) 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Gabe M. Black
 *          Ali G. Saidi
 */

#include "arch/sparc/utility.hh"
#if FULL_SYSTEM
#include "arch/sparc/vtophys.hh"
#include "mem/vport.hh"
#endif

namespace SparcISA {


//The caller uses %o0-%05 for the first 6 arguments even if their floating
//point. Double precision floating point values take two registers/args.
//Quads, structs, and unions are passed as pointers. All arguments beyond
//the sixth are passed on the stack past the 16 word window save area,
//space for the struct/union return pointer, and space reserved for the
//first 6 arguments which the caller may use but doesn't have to.
uint64_t getArgument(ThreadContext *tc, int number, bool fp) {
#if FULL_SYSTEM
    if (number < NumArgumentRegs) {
        return tc->readIntReg(ArgumentReg[number]);
    } else {
        Addr sp = tc->readIntReg(StackPointerReg);
        VirtualPort *vp = tc->getVirtPort(tc);
        uint64_t arg = vp->read<uint64_t>(sp + 92 + 
                            (number-NumArgumentRegs) * sizeof(uint64_t));
        tc->delVirtPort(vp);
        return arg;
    }
#else
    panic("getArgument() only implemented for FULL_SYSTEM\n");
    M5_DUMMY_RETURN
#endif
}
} //namespace SPARC_ISA