cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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msa.c (1944B)

      1/*
      2 * MIPS SIMD Architecture Module Instruction emulation helpers for QEMU.
      3 *
      4 * Copyright (c) 2014 Imagination Technologies
      5 *
      6 * This library is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU Lesser General Public
      8 * License as published by the Free Software Foundation; either
      9 * version 2.1 of the License, or (at your option) any later version.
     10 *
     11 * This library is distributed in the hope that it will be useful,
     12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14 * Lesser General Public License for more details.
     15 *
     16 * You should have received a copy of the GNU Lesser General Public
     17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
     18 */
     19
     20#include "qemu/osdep.h"
     21#include "cpu.h"
     22#include "internal.h"
     23#include "fpu/softfloat.h"
     24#include "fpu_helper.h"
     25
     26void msa_reset(CPUMIPSState *env)
     27{
     28    if (!ase_msa_available(env)) {
     29        return;
     30    }
     31
     32#ifdef CONFIG_USER_ONLY
     33    /* MSA access enabled */
     34    env->CP0_Config5 |= 1 << CP0C5_MSAEn;
     35    env->CP0_Status |= (1 << CP0St_CU1) | (1 << CP0St_FR);
     36#endif
     37
     38    /*
     39     * MSA CSR:
     40     * - non-signaling floating point exception mode off (NX bit is 0)
     41     * - Cause, Enables, and Flags are all 0
     42     * - round to nearest / ties to even (RM bits are 0)
     43     */
     44    env->active_tc.msacsr = 0;
     45
     46    restore_msa_fp_status(env);
     47
     48    /* tininess detected after rounding.*/
     49    set_float_detect_tininess(float_tininess_after_rounding,
     50                              &env->active_tc.msa_fp_status);
     51
     52    /* clear float_status exception flags */
     53    set_float_exception_flags(0, &env->active_tc.msa_fp_status);
     54
     55    /* clear float_status nan mode */
     56    set_default_nan_mode(0, &env->active_tc.msa_fp_status);
     57
     58    /* set proper signanling bit meaning ("1" means "quiet") */
     59    set_snan_bit_is_one(0, &env->active_tc.msa_fp_status);
     60}