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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fpu_helper.h (1829B)

      1/*
      2 * Helpers for emulation of FPU-related MIPS instructions.
      3 *
      4 *  Copyright (C) 2004-2005  Jocelyn Mayer
      5 *
      6 * SPDX-License-Identifier: LGPL-2.1-or-later
      7 */
      8#include "fpu/softfloat-helpers.h"
      9#include "cpu.h"
     10
     11extern const FloatRoundMode ieee_rm[4];
     12
     13uint32_t float_class_s(uint32_t arg, float_status *fst);
     14uint64_t float_class_d(uint64_t arg, float_status *fst);
     15
     16static inline void restore_rounding_mode(CPUMIPSState *env)
     17{
     18    set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3],
     19                            &env->active_fpu.fp_status);
     20}
     21
     22static inline void restore_flush_mode(CPUMIPSState *env)
     23{
     24    set_flush_to_zero((env->active_fpu.fcr31 & (1 << FCR31_FS)) != 0,
     25                      &env->active_fpu.fp_status);
     26}
     27
     28static inline void restore_snan_bit_mode(CPUMIPSState *env)
     29{
     30    bool nan2008 = env->active_fpu.fcr31 & (1 << FCR31_NAN2008);
     31
     32    /*
     33     * With nan2008, SNaNs are silenced in the usual way.
     34     * Before that, SNaNs are not silenced; default nans are produced.
     35     */
     36    set_snan_bit_is_one(!nan2008, &env->active_fpu.fp_status);
     37    set_default_nan_mode(!nan2008, &env->active_fpu.fp_status);
     38}
     39
     40static inline void restore_fp_status(CPUMIPSState *env)
     41{
     42    restore_rounding_mode(env);
     43    restore_flush_mode(env);
     44    restore_snan_bit_mode(env);
     45}
     46
     47/* MSA */
     48
     49enum CPUMIPSMSADataFormat {
     50    DF_BYTE = 0,
     51    DF_HALF,
     52    DF_WORD,
     53    DF_DOUBLE
     54};
     55
     56static inline void restore_msa_fp_status(CPUMIPSState *env)
     57{
     58    float_status *status = &env->active_tc.msa_fp_status;
     59    int rounding_mode = (env->active_tc.msacsr & MSACSR_RM_MASK) >> MSACSR_RM;
     60    bool flush_to_zero = (env->active_tc.msacsr & MSACSR_FS_MASK) != 0;
     61
     62    set_float_rounding_mode(ieee_rm[rounding_mode], status);
     63    set_flush_to_zero(flush_to_zero, status);
     64    set_flush_inputs_to_zero(flush_to_zero, status);
     65}