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 "exec/exec-all.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 = env_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_revbits(uint64_t arg)
  58{
  59    return revbit64(arg);
  60}
  61
  62/*
  63 * Functional Description
  64 *     uint64_t a = rf[SrcA];
  65 *     uint64_t b = rf[SrcB];
  66 *     uint64_t d = rf[Dest];
  67 *     uint64_t output = 0;
  68 *     unsigned int counter;
  69 *     for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
  70 *     {
  71 *         int sel = getByte (b, counter) & 0xf;
  72 *         uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
  73 *         output = setByte (output, counter, byte);
  74 *     }
  75 *     rf[Dest] = output;
  76 */
  77uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
  78{
  79    uint64_t vdst = 0;
  80    int count;
  81
  82    for (count = 0; count < 64; count += 8) {
  83        uint64_t sel = srcb >> count;
  84        uint64_t src = (sel & 8) ? srca : dest;
  85        vdst |= extract64(src, (sel & 7) * 8, 8) << count;
  86    }
  87
  88    return vdst;
  89}
  90
  91uint64_t helper_crc32_8(uint64_t accum, uint64_t input)
  92{
  93    uint8_t buf = input;
  94
  95    /* zlib crc32 converts the accumulator and output to one's complement.  */
  96    return crc32(accum ^ 0xffffffff, &buf, 1) ^ 0xffffffff;
  97}
  98
  99uint64_t helper_crc32_32(uint64_t accum, uint64_t input)
 100{
 101    uint8_t buf[4];
 102
 103    stl_le_p(buf, input);
 104
 105    /* zlib crc32 converts the accumulator and output to one's complement.  */
 106    return crc32(accum ^ 0xffffffff, buf, 4) ^ 0xffffffff;
 107}
 108
 109uint64_t helper_cmula(uint64_t srcd, uint64_t srca, uint64_t srcb)
 110{
 111    uint32_t reala = (int16_t)srca;
 112    uint32_t imaga = (int16_t)(srca >> 16);
 113    uint32_t realb = (int16_t)srcb;
 114    uint32_t imagb = (int16_t)(srcb >> 16);
 115    uint32_t reald = srcd;
 116    uint32_t imagd = srcd >> 32;
 117    uint32_t realr = reala * realb - imaga * imagb + reald;
 118    uint32_t imagr = reala * imagb + imaga * realb + imagd;
 119
 120    return deposit64(realr, 32, 32, imagr);
 121}
 122
 123uint64_t helper_cmulaf(uint64_t srcd, uint64_t srca, uint64_t srcb)
 124{
 125    uint32_t reala = (int16_t)srca;
 126    uint32_t imaga = (int16_t)(srca >> 16);
 127    uint32_t realb = (int16_t)srcb;
 128    uint32_t imagb = (int16_t)(srcb >> 16);
 129    uint32_t reald = (int16_t)srcd;
 130    uint32_t imagd = (int16_t)(srcd >> 16);
 131    int32_t realr = reala * realb - imaga * imagb;
 132    int32_t imagr = reala * imagb + imaga * realb;
 133
 134    return deposit32((realr >> 15) + reald, 16, 16, (imagr >> 15) + imagd);
 135}
 136
 137uint64_t helper_cmul2(uint64_t srca, uint64_t srcb, int shift, int round)
 138{
 139    uint32_t reala = (int16_t)srca;
 140    uint32_t imaga = (int16_t)(srca >> 16);
 141    uint32_t realb = (int16_t)srcb;
 142    uint32_t imagb = (int16_t)(srcb >> 16);
 143    int32_t realr = reala * realb - imaga * imagb + round;
 144    int32_t imagr = reala * imagb + imaga * realb + round;
 145
 146    return deposit32(realr >> shift, 16, 16, imagr >> shift);
 147}
 148