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