src/arch/sparc/utility.cc

   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
  38 namespace 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.
  47 uint64_t getArgument(ThreadContext *tc, int number, bool fp) {
  48 #if FULL_SYSTEM
  49     const int NumArgumentRegs = 6;
  50     if (number < NumArgumentRegs) {
  51         return tc->readIntReg(8 + number);
  52     } else {
  53         Addr sp = tc->readIntReg(StackPointerReg);
  54         VirtualPort *vp = tc->getVirtPort();
  55         uint64_t arg = vp->read<uint64_t>(sp + 92 +
  56                             (number-NumArgumentRegs) * sizeof(uint64_t));
  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