LXR qemu/target-tilegx/helper.c

   1/*
   2 * QEMU TILE-Gx helpers
   3 *
   4 *  Copyright (c) 2015 Chen Gang
   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
  18 * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "cpu.h"
  23#include "qemu-common.h"
  24#include "exec/helper-proto.h"
  25#include <zlib.h> /* For crc32 */
  26#include "syscall_defs.h"
  27
  28void helper_exception(CPUTLGState *env, uint32_t excp)
  29{
  30    CPUState *cs = CPU(tilegx_env_get_cpu(env));
  31
  32    cs->exception_index = excp;
  33    cpu_loop_exit(cs);
  34}
  35
  36void helper_ext01_ics(CPUTLGState *env)
  37{
  38    uint64_t val = env->spregs[TILEGX_SPR_EX_CONTEXT_0_1];
  39
  40    switch (val) {
  41    case 0:
  42    case 1:
  43        env->spregs[TILEGX_SPR_CRITICAL_SEC] = val;
  44        break;
  45    default:
  46#if defined(CONFIG_USER_ONLY)
  47        env->signo = TARGET_SIGILL;
  48        env->sigcode = TARGET_ILL_ILLOPC;
  49        helper_exception(env, TILEGX_EXCP_SIGNAL);
  50#else
  51        helper_exception(env, TILEGX_EXCP_OPCODE_UNIMPLEMENTED);
  52#endif
  53        break;
  54    }
  55}
  56
  57uint64_t helper_cntlz(uint64_t arg)
  58{
  59    return clz64(arg);
  60}
  61
  62uint64_t helper_cnttz(uint64_t arg)
  63{
  64    return ctz64(arg);
  65}
  66
  67uint64_t helper_pcnt(uint64_t arg)
  68{
  69    return ctpop64(arg);
  70}
  71
  72uint64_t helper_revbits(uint64_t arg)
  73{
  74    return revbit64(arg);
  75}
  76
  77/*
  78 * Functional Description
  79 *     uint64_t a = rf[SrcA];
  80 *     uint64_t b = rf[SrcB];
  81 *     uint64_t d = rf[Dest];
  82 *     uint64_t output = 0;
  83 *     unsigned int counter;
  84 *     for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
  85 *     {
  86 *         int sel = getByte (b, counter) & 0xf;
  87 *         uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
  88 *         output = setByte (output, counter, byte);
  89 *     }
  90 *     rf[Dest] = output;
  91 */
  92uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
  93{
  94    uint64_t vdst = 0;
  95    int count;
  96
  97    for (count = 0; count < 64; count += 8) {
  98        uint64_t sel = srcb >> count;
  99        uint64_t src = (sel & 8) ? srca : dest;
 100        vdst |= extract64(src, (sel & 7) * 8, 8) << count;
 101    }
 102
 103    return vdst;
 104}
 105
 106uint64_t helper_crc32_8(uint64_t accum, uint64_t input)
 107{
 108    uint8_t buf = input;
 109
 110    /* zlib crc32 converts the accumulator and output to one's complement.  */
 111    return crc32(accum ^ 0xffffffff, &buf, 1) ^ 0xffffffff;
 112}
 113
 114uint64_t helper_crc32_32(uint64_t accum, uint64_t input)
 115{
 116    uint8_t buf[4];
 117
 118    stl_le_p(buf, input);
 119
 120    /* zlib crc32 converts the accumulator and output to one's complement.  */
 121    return crc32(accum ^ 0xffffffff, buf, 4) ^ 0xffffffff;
 122}
 123
 124uint64_t helper_cmula(uint64_t srcd, uint64_t srca, uint64_t srcb)
 125{
 126    uint32_t reala = (int16_t)srca;
 127    uint32_t imaga = (int16_t)(srca >> 16);
 128    uint32_t realb = (int16_t)srcb;
 129    uint32_t imagb = (int16_t)(srcb >> 16);
 130    uint32_t reald = srcd;
 131    uint32_t imagd = srcd >> 32;
 132    uint32_t realr = reala * realb - imaga * imagb + reald;
 133    uint32_t imagr = reala * imagb + imaga * realb + imagd;
 134
 135    return deposit64(realr, 32, 32, imagr);
 136}
 137
 138uint64_t helper_cmulaf(uint64_t srcd, uint64_t srca, uint64_t srcb)
 139{
 140    uint32_t reala = (int16_t)srca;
 141    uint32_t imaga = (int16_t)(srca >> 16);
 142    uint32_t realb = (int16_t)srcb;
 143    uint32_t imagb = (int16_t)(srcb >> 16);
 144    uint32_t reald = (int16_t)srcd;
 145    uint32_t imagd = (int16_t)(srcd >> 16);
 146    int32_t realr = reala * realb - imaga * imagb;
 147    int32_t imagr = reala * imagb + imaga * realb;
 148
 149    return deposit32((realr >> 15) + reald, 16, 16, (imagr >> 15) + imagd);
 150}
 151
 152uint64_t helper_cmul2(uint64_t srca, uint64_t srcb, int shift, int round)
 153{
 154    uint32_t reala = (int16_t)srca;
 155    uint32_t imaga = (int16_t)(srca >> 16);
 156    uint32_t realb = (int16_t)srcb;
 157    uint32_t imagb = (int16_t)(srcb >> 16);
 158    int32_t realr = reala * realb - imaga * imagb + round;
 159    int32_t imagr = reala * imagb + imaga * realb + round;
 160
 161    return deposit32(realr >> shift, 16, 16, imagr >> shift);
 162}
 163