cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

fpa11_cpdo.c (3431B)

      1/*
      2    NetWinder Floating Point Emulator
      3    (c) Rebel.COM, 1998,1999
      4
      5    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
      6
      7    This program is free software; you can redistribute it and/or modify
      8    it under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 2 of the License, or
     10    (at your option) any later version.
     11
     12    This program is distributed in the hope that it will be useful,
     13    but WITHOUT ANY WARRANTY; without even the implied warranty of
     14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15    GNU General Public License for more details.
     16
     17    You should have received a copy of the GNU General Public License
     18    along with this program; if not, see <http://www.gnu.org/licenses/>.
     19*/
     20
     21#include "qemu/osdep.h"
     22#include "fpa11.h"
     23#include "fpopcode.h"
     24
     25unsigned int EmulateCPDO(const unsigned int opcode)
     26{
     27   FPA11 *fpa11 = GET_FPA11();
     28   unsigned int Fd, nType, nDest, nRc = 1;
     29
     30   //printk("EmulateCPDO(0x%08x)\n",opcode);
     31
     32   /* Get the destination size.  If not valid let Linux perform
     33      an invalid instruction trap. */
     34   nDest = getDestinationSize(opcode);
     35   if (typeNone == nDest) return 0;
     36
     37   SetRoundingMode(opcode);
     38
     39   /* Compare the size of the operands in Fn and Fm.
     40      Choose the largest size and perform operations in that size,
     41      in order to make use of all the precision of the operands.
     42      If Fm is a constant, we just grab a constant of a size
     43      matching the size of the operand in Fn. */
     44   if (MONADIC_INSTRUCTION(opcode))
     45     nType = nDest;
     46   else
     47     nType = fpa11->fType[getFn(opcode)];
     48
     49   if (!CONSTANT_FM(opcode))
     50   {
     51     register unsigned int Fm = getFm(opcode);
     52     if (nType < fpa11->fType[Fm])
     53     {
     54        nType = fpa11->fType[Fm];
     55     }
     56   }
     57
     58   switch (nType)
     59   {
     60      case typeSingle   : nRc = SingleCPDO(opcode);   break;
     61      case typeDouble   : nRc = DoubleCPDO(opcode);   break;
     62      case typeExtended : nRc = ExtendedCPDO(opcode); break;
     63      default           : nRc = 0;
     64   }
     65
     66   /* If the operation succeeded, check to see if the result in the
     67      destination register is the correct size.  If not force it
     68      to be. */
     69   Fd = getFd(opcode);
     70   nType = fpa11->fType[Fd];
     71   if ((0 != nRc) && (nDest != nType))
     72   {
     73     switch (nDest)
     74     {
     75       case typeSingle:
     76       {
     77         if (typeDouble == nType)
     78           fpa11->fpreg[Fd].fSingle =
     79              float64_to_float32(fpa11->fpreg[Fd].fDouble, &fpa11->fp_status);
     80         else
     81           fpa11->fpreg[Fd].fSingle =
     82              floatx80_to_float32(fpa11->fpreg[Fd].fExtended, &fpa11->fp_status);
     83       }
     84       break;
     85
     86       case typeDouble:
     87       {
     88         if (typeSingle == nType)
     89           fpa11->fpreg[Fd].fDouble =
     90              float32_to_float64(fpa11->fpreg[Fd].fSingle, &fpa11->fp_status);
     91         else
     92           fpa11->fpreg[Fd].fDouble =
     93              floatx80_to_float64(fpa11->fpreg[Fd].fExtended, &fpa11->fp_status);
     94       }
     95       break;
     96
     97       case typeExtended:
     98       {
     99         if (typeSingle == nType)
    100           fpa11->fpreg[Fd].fExtended =
    101              float32_to_floatx80(fpa11->fpreg[Fd].fSingle, &fpa11->fp_status);
    102         else
    103           fpa11->fpreg[Fd].fExtended =
    104              float64_to_floatx80(fpa11->fpreg[Fd].fDouble, &fpa11->fp_status);
    105       }
    106       break;
    107     }
    108
    109     fpa11->fType[Fd] = nDest;
    110   }
    111
    112   return nRc;
    113}