cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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double_cpdo.c (3463B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3    NetWinder Floating Point Emulator
      4    (c) Rebel.COM, 1998,1999
      5
      6    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
      7
      8*/
      9
     10#include "fpa11.h"
     11#include "softfloat.h"
     12#include "fpopcode.h"
     13
     14union float64_components {
     15	float64 f64;
     16	unsigned int i[2];
     17};
     18
     19float64 float64_exp(float64 Fm);
     20float64 float64_ln(float64 Fm);
     21float64 float64_sin(float64 rFm);
     22float64 float64_cos(float64 rFm);
     23float64 float64_arcsin(float64 rFm);
     24float64 float64_arctan(float64 rFm);
     25float64 float64_log(float64 rFm);
     26float64 float64_tan(float64 rFm);
     27float64 float64_arccos(float64 rFm);
     28float64 float64_pow(float64 rFn, float64 rFm);
     29float64 float64_pol(float64 rFn, float64 rFm);
     30
     31static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
     32{
     33	return float64_sub(roundData, rFm, rFn);
     34}
     35
     36static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
     37{
     38	return float64_div(roundData, rFm, rFn);
     39}
     40
     41static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
     42	[ADF_CODE >> 20] = float64_add,
     43	[MUF_CODE >> 20] = float64_mul,
     44	[SUF_CODE >> 20] = float64_sub,
     45	[RSF_CODE >> 20] = float64_rsf,
     46	[DVF_CODE >> 20] = float64_div,
     47	[RDF_CODE >> 20] = float64_rdv,
     48	[RMF_CODE >> 20] = float64_rem,
     49
     50	/* strictly, these opcodes should not be implemented */
     51	[FML_CODE >> 20] = float64_mul,
     52	[FDV_CODE >> 20] = float64_div,
     53	[FRD_CODE >> 20] = float64_rdv,
     54};
     55
     56static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
     57{
     58	return rFm;
     59}
     60
     61static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
     62{
     63	union float64_components u;
     64
     65	u.f64 = rFm;
     66#ifdef __ARMEB__
     67	u.i[0] ^= 0x80000000;
     68#else
     69	u.i[1] ^= 0x80000000;
     70#endif
     71
     72	return u.f64;
     73}
     74
     75static float64 float64_abs(struct roundingData *roundData,float64 rFm)
     76{
     77	union float64_components u;
     78
     79	u.f64 = rFm;
     80#ifdef __ARMEB__
     81	u.i[0] &= 0x7fffffff;
     82#else
     83	u.i[1] &= 0x7fffffff;
     84#endif
     85
     86	return u.f64;
     87}
     88
     89static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
     90	[MVF_CODE >> 20] = float64_mvf,
     91	[MNF_CODE >> 20] = float64_mnf,
     92	[ABS_CODE >> 20] = float64_abs,
     93	[RND_CODE >> 20] = float64_round_to_int,
     94	[URD_CODE >> 20] = float64_round_to_int,
     95	[SQT_CODE >> 20] = float64_sqrt,
     96	[NRM_CODE >> 20] = float64_mvf,
     97};
     98
     99unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
    100{
    101	FPA11 *fpa11 = GET_FPA11();
    102	float64 rFm;
    103	unsigned int Fm, opc_mask_shift;
    104
    105	Fm = getFm(opcode);
    106	if (CONSTANT_FM(opcode)) {
    107		rFm = getDoubleConstant(Fm);
    108	} else {
    109		switch (fpa11->fType[Fm]) {
    110		case typeSingle:
    111			rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
    112			break;
    113
    114		case typeDouble:
    115			rFm = fpa11->fpreg[Fm].fDouble;
    116			break;
    117
    118		default:
    119			return 0;
    120		}
    121	}
    122
    123	opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
    124	if (!MONADIC_INSTRUCTION(opcode)) {
    125		unsigned int Fn = getFn(opcode);
    126		float64 rFn;
    127
    128		switch (fpa11->fType[Fn]) {
    129		case typeSingle:
    130			rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
    131			break;
    132
    133		case typeDouble:
    134			rFn = fpa11->fpreg[Fn].fDouble;
    135			break;
    136
    137		default:
    138			return 0;
    139		}
    140
    141		if (dyadic_double[opc_mask_shift]) {
    142			rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
    143		} else {
    144			return 0;
    145		}
    146	} else {
    147		if (monadic_double[opc_mask_shift]) {
    148			rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
    149		} else {
    150			return 0;
    151		}
    152	}
    153
    154	return 1;
    155}