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
  28 void 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
  36 void 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
  57 uint64_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  */
  77 uint64_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
  91 uint64_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
  99 uint64_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
 109 uint64_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
 123 uint64_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
 137 uint64_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 }