qemu/target-openrisc/fpu_helper.c

   1 /*
   2  * OpenRISC float helper routines
   3  *
   4  * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
   5  *                         Feng Gao <gf91597@gmail.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "exec/helper-proto.h"
  24 #include "exception.h"
  25
  26 static inline uint32_t ieee_ex_to_openrisc(OpenRISCCPU *cpu, int fexcp)
  27 {
  28     int ret = 0;
  29     if (fexcp) {
  30         if (fexcp & float_flag_invalid) {
  31             cpu->env.fpcsr |= FPCSR_IVF;
  32             ret = 1;
  33         }
  34         if (fexcp & float_flag_overflow) {
  35             cpu->env.fpcsr |= FPCSR_OVF;
  36             ret = 1;
  37         }
  38         if (fexcp & float_flag_underflow) {
  39             cpu->env.fpcsr |= FPCSR_UNF;
  40             ret = 1;
  41         }
  42         if (fexcp & float_flag_divbyzero) {
  43             cpu->env.fpcsr |= FPCSR_DZF;
  44             ret = 1;
  45         }
  46         if (fexcp & float_flag_inexact) {
  47             cpu->env.fpcsr |= FPCSR_IXF;
  48             ret = 1;
  49         }
  50     }
  51
  52     return ret;
  53 }
  54
  55 static inline void update_fpcsr(OpenRISCCPU *cpu)
  56 {
  57     int tmp = ieee_ex_to_openrisc(cpu,
  58                               get_float_exception_flags(&cpu->env.fp_status));
  59
  60     SET_FP_CAUSE(cpu->env.fpcsr, tmp);
  61     if ((GET_FP_ENABLE(cpu->env.fpcsr) & tmp) &&
  62         (cpu->env.fpcsr & FPCSR_FPEE)) {
  63         helper_exception(&cpu->env, EXCP_FPE);
  64     } else {
  65         UPDATE_FP_FLAGS(cpu->env.fpcsr, tmp);
  66     }
  67 }
  68
  69 uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
  70 {
  71     uint64_t itofd;
  72     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
  73
  74     set_float_exception_flags(0, &cpu->env.fp_status);
  75     itofd = int32_to_float64(val, &cpu->env.fp_status);
  76     update_fpcsr(cpu);
  77
  78     return itofd;
  79 }
  80
  81 uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
  82 {
  83     uint32_t itofs;
  84     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
  85
  86     set_float_exception_flags(0, &cpu->env.fp_status);
  87     itofs = int32_to_float32(val, &cpu->env.fp_status);
  88     update_fpcsr(cpu);
  89
  90     return itofs;
  91 }
  92
  93 uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
  94 {
  95     uint64_t ftoid;
  96     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
  97
  98     set_float_exception_flags(0, &cpu->env.fp_status);
  99     ftoid = float32_to_int64(val, &cpu->env.fp_status);
 100     update_fpcsr(cpu);
 101
 102     return ftoid;
 103 }
 104
 105 uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
 106 {
 107     uint32_t ftois;
 108     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
 109
 110     set_float_exception_flags(0, &cpu->env.fp_status);
 111     ftois = float32_to_int32(val, &cpu->env.fp_status);
 112     update_fpcsr(cpu);
 113
 114     return ftois;
 115 }
 116
 117 #define FLOAT_OP(name, p) void helper_float_##_##p(void)
 118
 119 #define FLOAT_CALC(name)                                                  \
 120 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 121                                      uint64_t fdt0, uint64_t fdt1)        \
 122 {                                                                         \
 123     uint64_t result;                                                      \
 124     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 125     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 126     result = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
 127     update_fpcsr(cpu);                                                    \
 128     return result;                                                        \
 129 }                                                                         \
 130                                                                           \
 131 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 132                                      uint32_t fdt0, uint32_t fdt1)        \
 133 {                                                                         \
 134     uint32_t result;                                                      \
 135     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 136     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 137     result = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);           \
 138     update_fpcsr(cpu);                                                    \
 139     return result;                                                        \
 140 }                                                                         \
 141
 142 FLOAT_CALC(add)
 143 FLOAT_CALC(sub)
 144 FLOAT_CALC(mul)
 145 FLOAT_CALC(div)
 146 FLOAT_CALC(rem)
 147 #undef FLOAT_CALC
 148
 149 #define FLOAT_TERNOP(name1, name2)                                        \
 150 uint64_t helper_float_ ## name1 ## name2 ## _d(CPUOpenRISCState *env,     \
 151                                                uint64_t fdt0,             \
 152                                                uint64_t fdt1)             \
 153 {                                                                         \
 154     uint64_t result, temp, hi, lo;                                        \
 155     uint32_t val1, val2;                                                  \
 156     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 157     hi = env->fpmaddhi;                                                   \
 158     lo = env->fpmaddlo;                                                   \
 159     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 160     result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
 161     lo &= 0xffffffff;                                                     \
 162     hi &= 0xffffffff;                                                     \
 163     temp = (hi << 32) | lo;                                               \
 164     result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
 165     val1 = result >> 32;                                                  \
 166     val2 = (uint32_t) (result & 0xffffffff);                              \
 167     update_fpcsr(cpu);                                                    \
 168     cpu->env.fpmaddlo = val2;                                             \
 169     cpu->env.fpmaddhi = val1;                                             \
 170     return 0;                                                             \
 171 }                                                                         \
 172                                                                           \
 173 uint32_t helper_float_ ## name1 ## name2 ## _s(CPUOpenRISCState *env,     \
 174                                             uint32_t fdt0, uint32_t fdt1) \
 175 {                                                                         \
 176     uint64_t result, temp, hi, lo;                                        \
 177     uint32_t val1, val2;                                                  \
 178     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 179     hi = cpu->env.fpmaddhi;                                               \
 180     lo = cpu->env.fpmaddlo;                                               \
 181     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 182     result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status);          \
 183     temp = (hi << 32) | lo;                                               \
 184     result = float64_ ## name2(result, temp, &cpu->env.fp_status);        \
 185     val1 = result >> 32;                                                  \
 186     val2 = (uint32_t) (result & 0xffffffff);                              \
 187     update_fpcsr(cpu);                                                    \
 188     cpu->env.fpmaddlo = val2;                                             \
 189     cpu->env.fpmaddhi = val1;                                             \
 190     return 0;                                                             \
 191 }
 192
 193 FLOAT_TERNOP(mul, add)
 194 #undef FLOAT_TERNOP
 195
 196
 197 #define FLOAT_CMP(name)                                                   \
 198 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 199                                      uint64_t fdt0, uint64_t fdt1)        \
 200 {                                                                         \
 201     int res;                                                              \
 202     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 203     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 204     res = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
 205     update_fpcsr(cpu);                                                    \
 206     return res;                                                           \
 207 }                                                                         \
 208                                                                           \
 209 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 210                                              uint32_t fdt0, uint32_t fdt1)\
 211 {                                                                         \
 212     int res;                                                              \
 213     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 214     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 215     res = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status);              \
 216     update_fpcsr(cpu);                                                    \
 217     return res;                                                           \
 218 }
 219
 220 FLOAT_CMP(le)
 221 FLOAT_CMP(eq)
 222 FLOAT_CMP(lt)
 223 #undef FLOAT_CMP
 224
 225
 226 #define FLOAT_CMPNE(name)                                                 \
 227 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 228                                      uint64_t fdt0, uint64_t fdt1)        \
 229 {                                                                         \
 230     int res;                                                              \
 231     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 232     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 233     res = !float64_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
 234     update_fpcsr(cpu);                                                    \
 235     return res;                                                           \
 236 }                                                                         \
 237                                                                           \
 238 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 239                                      uint32_t fdt0, uint32_t fdt1)        \
 240 {                                                                         \
 241     int res;                                                              \
 242     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 243     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 244     res = !float32_eq_quiet(fdt0, fdt1, &cpu->env.fp_status);             \
 245     update_fpcsr(cpu);                                                    \
 246     return res;                                                           \
 247 }
 248
 249 FLOAT_CMPNE(ne)
 250 #undef FLOAT_CMPNE
 251
 252 #define FLOAT_CMPGT(name)                                                 \
 253 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 254                                      uint64_t fdt0, uint64_t fdt1)        \
 255 {                                                                         \
 256     int res;                                                              \
 257     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 258     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 259     res = !float64_le(fdt0, fdt1, &cpu->env.fp_status);                   \
 260     update_fpcsr(cpu);                                                    \
 261     return res;                                                           \
 262 }                                                                         \
 263                                                                           \
 264 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 265                                      uint32_t fdt0, uint32_t fdt1)        \
 266 {                                                                         \
 267     int res;                                                              \
 268     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 269     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 270     res = !float32_le(fdt0, fdt1, &cpu->env.fp_status);                   \
 271     update_fpcsr(cpu);                                                    \
 272     return res;                                                           \
 273 }
 274 FLOAT_CMPGT(gt)
 275 #undef FLOAT_CMPGT
 276
 277 #define FLOAT_CMPGE(name)                                                 \
 278 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env,               \
 279                                      uint64_t fdt0, uint64_t fdt1)        \
 280 {                                                                         \
 281     int res;                                                              \
 282     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 283     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 284     res = !float64_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
 285     update_fpcsr(cpu);                                                    \
 286     return res;                                                           \
 287 }                                                                         \
 288                                                                           \
 289 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env,               \
 290                                      uint32_t fdt0, uint32_t fdt1)        \
 291 {                                                                         \
 292     int res;                                                              \
 293     OpenRISCCPU *cpu = openrisc_env_get_cpu(env);                         \
 294     set_float_exception_flags(0, &cpu->env.fp_status);                    \
 295     res = !float32_lt(fdt0, fdt1, &cpu->env.fp_status);                   \
 296     update_fpcsr(cpu);                                                    \
 297     return res;                                                           \
 298 }
 299
 300 FLOAT_CMPGE(ge)
 301 #undef FLOAT_CMPGE