target-s390x/cc_helper.c

   1 /*
   2  *  S/390 condition code helper routines
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2009 Alexander Graf
   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 "cpu.h"
  22 #include "exec/helper-proto.h"
  23 #include "qemu/host-utils.h"
  24
  25 /* #define DEBUG_HELPER */
  26 #ifdef DEBUG_HELPER
  27 #define HELPER_LOG(x...) qemu_log(x)
  28 #else
  29 #define HELPER_LOG(x...)
  30 #endif
  31
  32 static uint32_t cc_calc_ltgt_32(int32_t src, int32_t dst)
  33 {
  34     if (src == dst) {
  35         return 0;
  36     } else if (src < dst) {
  37         return 1;
  38     } else {
  39         return 2;
  40     }
  41 }
  42
  43 static uint32_t cc_calc_ltgt0_32(int32_t dst)
  44 {
  45     return cc_calc_ltgt_32(dst, 0);
  46 }
  47
  48 static uint32_t cc_calc_ltgt_64(int64_t src, int64_t dst)
  49 {
  50     if (src == dst) {
  51         return 0;
  52     } else if (src < dst) {
  53         return 1;
  54     } else {
  55         return 2;
  56     }
  57 }
  58
  59 static uint32_t cc_calc_ltgt0_64(int64_t dst)
  60 {
  61     return cc_calc_ltgt_64(dst, 0);
  62 }
  63
  64 static uint32_t cc_calc_ltugtu_32(uint32_t src, uint32_t dst)
  65 {
  66     if (src == dst) {
  67         return 0;
  68     } else if (src < dst) {
  69         return 1;
  70     } else {
  71         return 2;
  72     }
  73 }
  74
  75 static uint32_t cc_calc_ltugtu_64(uint64_t src, uint64_t dst)
  76 {
  77     if (src == dst) {
  78         return 0;
  79     } else if (src < dst) {
  80         return 1;
  81     } else {
  82         return 2;
  83     }
  84 }
  85
  86 static uint32_t cc_calc_tm_32(uint32_t val, uint32_t mask)
  87 {
  88     uint32_t r = val & mask;
  89
  90     if (r == 0) {
  91         return 0;
  92     } else if (r == mask) {
  93         return 3;
  94     } else {
  95         return 1;
  96     }
  97 }
  98
  99 static uint32_t cc_calc_tm_64(uint64_t val, uint64_t mask)
 100 {
 101     uint64_t r = val & mask;
 102
 103     if (r == 0) {
 104         return 0;
 105     } else if (r == mask) {
 106         return 3;
 107     } else {
 108         int top = clz64(mask);
 109         if ((int64_t)(val << top) < 0) {
 110             return 2;
 111         } else {
 112             return 1;
 113         }
 114     }
 115 }
 116
 117 static uint32_t cc_calc_nz(uint64_t dst)
 118 {
 119     return !!dst;
 120 }
 121
 122 static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar)
 123 {
 124     if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
 125         return 3; /* overflow */
 126     } else {
 127         if (ar < 0) {
 128             return 1;
 129         } else if (ar > 0) {
 130             return 2;
 131         } else {
 132             return 0;
 133         }
 134     }
 135 }
 136
 137 static uint32_t cc_calc_addu_64(uint64_t a1, uint64_t a2, uint64_t ar)
 138 {
 139     return (ar != 0) + 2 * (ar < a1);
 140 }
 141
 142 static uint32_t cc_calc_addc_64(uint64_t a1, uint64_t a2, uint64_t ar)
 143 {
 144     /* Recover a2 + carry_in.  */
 145     uint64_t a2c = ar - a1;
 146     /* Check for a2+carry_in overflow, then a1+a2c overflow.  */
 147     int carry_out = (a2c < a2) || (ar < a1);
 148
 149     return (ar != 0) + 2 * carry_out;
 150 }
 151
 152 static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar)
 153 {
 154     if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
 155         return 3; /* overflow */
 156     } else {
 157         if (ar < 0) {
 158             return 1;
 159         } else if (ar > 0) {
 160             return 2;
 161         } else {
 162             return 0;
 163         }
 164     }
 165 }
 166
 167 static uint32_t cc_calc_subu_64(uint64_t a1, uint64_t a2, uint64_t ar)
 168 {
 169     if (ar == 0) {
 170         return 2;
 171     } else {
 172         if (a2 > a1) {
 173             return 1;
 174         } else {
 175             return 3;
 176         }
 177     }
 178 }
 179
 180 static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar)
 181 {
 182     int borrow_out;
 183
 184     if (ar != a1 - a2) {        /* difference means borrow-in */
 185         borrow_out = (a2 >= a1);
 186     } else {
 187         borrow_out = (a2 > a1);
 188     }
 189
 190     return (ar != 0) + 2 * !borrow_out;
 191 }
 192
 193 static uint32_t cc_calc_abs_64(int64_t dst)
 194 {
 195     if ((uint64_t)dst == 0x8000000000000000ULL) {
 196         return 3;
 197     } else if (dst) {
 198         return 2;
 199     } else {
 200         return 0;
 201     }
 202 }
 203
 204 static uint32_t cc_calc_nabs_64(int64_t dst)
 205 {
 206     return !!dst;
 207 }
 208
 209 static uint32_t cc_calc_comp_64(int64_t dst)
 210 {
 211     if ((uint64_t)dst == 0x8000000000000000ULL) {
 212         return 3;
 213     } else if (dst < 0) {
 214         return 1;
 215     } else if (dst > 0) {
 216         return 2;
 217     } else {
 218         return 0;
 219     }
 220 }
 221
 222
 223 static uint32_t cc_calc_add_32(int32_t a1, int32_t a2, int32_t ar)
 224 {
 225     if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
 226         return 3; /* overflow */
 227     } else {
 228         if (ar < 0) {
 229             return 1;
 230         } else if (ar > 0) {
 231             return 2;
 232         } else {
 233             return 0;
 234         }
 235     }
 236 }
 237
 238 static uint32_t cc_calc_addu_32(uint32_t a1, uint32_t a2, uint32_t ar)
 239 {
 240     return (ar != 0) + 2 * (ar < a1);
 241 }
 242
 243 static uint32_t cc_calc_addc_32(uint32_t a1, uint32_t a2, uint32_t ar)
 244 {
 245     /* Recover a2 + carry_in.  */
 246     uint32_t a2c = ar - a1;
 247     /* Check for a2+carry_in overflow, then a1+a2c overflow.  */
 248     int carry_out = (a2c < a2) || (ar < a1);
 249
 250     return (ar != 0) + 2 * carry_out;
 251 }
 252
 253 static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar)
 254 {
 255     if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
 256         return 3; /* overflow */
 257     } else {
 258         if (ar < 0) {
 259             return 1;
 260         } else if (ar > 0) {
 261             return 2;
 262         } else {
 263             return 0;
 264         }
 265     }
 266 }
 267
 268 static uint32_t cc_calc_subu_32(uint32_t a1, uint32_t a2, uint32_t ar)
 269 {
 270     if (ar == 0) {
 271         return 2;
 272     } else {
 273         if (a2 > a1) {
 274             return 1;
 275         } else {
 276             return 3;
 277         }
 278     }
 279 }
 280
 281 static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar)
 282 {
 283     int borrow_out;
 284
 285     if (ar != a1 - a2) {        /* difference means borrow-in */
 286         borrow_out = (a2 >= a1);
 287     } else {
 288         borrow_out = (a2 > a1);
 289     }
 290
 291     return (ar != 0) + 2 * !borrow_out;
 292 }
 293
 294 static uint32_t cc_calc_abs_32(int32_t dst)
 295 {
 296     if ((uint32_t)dst == 0x80000000UL) {
 297         return 3;
 298     } else if (dst) {
 299         return 2;
 300     } else {
 301         return 0;
 302     }
 303 }
 304
 305 static uint32_t cc_calc_nabs_32(int32_t dst)
 306 {
 307     return !!dst;
 308 }
 309
 310 static uint32_t cc_calc_comp_32(int32_t dst)
 311 {
 312     if ((uint32_t)dst == 0x80000000UL) {
 313         return 3;
 314     } else if (dst < 0) {
 315         return 1;
 316     } else if (dst > 0) {
 317         return 2;
 318     } else {
 319         return 0;
 320     }
 321 }
 322
 323 /* calculate condition code for insert character under mask insn */
 324 static uint32_t cc_calc_icm(uint64_t mask, uint64_t val)
 325 {
 326     if ((val & mask) == 0) {
 327         return 0;
 328     } else {
 329         int top = clz64(mask);
 330         if ((int64_t)(val << top) < 0) {
 331             return 1;
 332         } else {
 333             return 2;
 334         }
 335     }
 336 }
 337
 338 static uint32_t cc_calc_sla_32(uint32_t src, int shift)
 339 {
 340     uint32_t mask = ((1U << shift) - 1U) << (32 - shift);
 341     uint32_t sign = 1U << 31;
 342     uint32_t match;
 343     int32_t r;
 344
 345     /* Check if the sign bit stays the same.  */
 346     if (src & sign) {
 347         match = mask;
 348     } else {
 349         match = 0;
 350     }
 351     if ((src & mask) != match) {
 352         /* Overflow.  */
 353         return 3;
 354     }
 355
 356     r = ((src << shift) & ~sign) | (src & sign);
 357     if (r == 0) {
 358         return 0;
 359     } else if (r < 0) {
 360         return 1;
 361     }
 362     return 2;
 363 }
 364
 365 static uint32_t cc_calc_sla_64(uint64_t src, int shift)
 366 {
 367     uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
 368     uint64_t sign = 1ULL << 63;
 369     uint64_t match;
 370     int64_t r;
 371
 372     /* Check if the sign bit stays the same.  */
 373     if (src & sign) {
 374         match = mask;
 375     } else {
 376         match = 0;
 377     }
 378     if ((src & mask) != match) {
 379         /* Overflow.  */
 380         return 3;
 381     }
 382
 383     r = ((src << shift) & ~sign) | (src & sign);
 384     if (r == 0) {
 385         return 0;
 386     } else if (r < 0) {
 387         return 1;
 388     }
 389     return 2;
 390 }
 391
 392 static uint32_t cc_calc_flogr(uint64_t dst)
 393 {
 394     return dst ? 2 : 0;
 395 }
 396
 397 static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op,
 398                                   uint64_t src, uint64_t dst, uint64_t vr)
 399 {
 400     S390CPU *cpu = s390_env_get_cpu(env);
 401     uint32_t r = 0;
 402
 403     switch (cc_op) {
 404     case CC_OP_CONST0:
 405     case CC_OP_CONST1:
 406     case CC_OP_CONST2:
 407     case CC_OP_CONST3:
 408         /* cc_op value _is_ cc */
 409         r = cc_op;
 410         break;
 411     case CC_OP_LTGT0_32:
 412         r = cc_calc_ltgt0_32(dst);
 413         break;
 414     case CC_OP_LTGT0_64:
 415         r =  cc_calc_ltgt0_64(dst);
 416         break;
 417     case CC_OP_LTGT_32:
 418         r =  cc_calc_ltgt_32(src, dst);
 419         break;
 420     case CC_OP_LTGT_64:
 421         r =  cc_calc_ltgt_64(src, dst);
 422         break;
 423     case CC_OP_LTUGTU_32:
 424         r =  cc_calc_ltugtu_32(src, dst);
 425         break;
 426     case CC_OP_LTUGTU_64:
 427         r =  cc_calc_ltugtu_64(src, dst);
 428         break;
 429     case CC_OP_TM_32:
 430         r =  cc_calc_tm_32(src, dst);
 431         break;
 432     case CC_OP_TM_64:
 433         r =  cc_calc_tm_64(src, dst);
 434         break;
 435     case CC_OP_NZ:
 436         r =  cc_calc_nz(dst);
 437         break;
 438     case CC_OP_ADD_64:
 439         r =  cc_calc_add_64(src, dst, vr);
 440         break;
 441     case CC_OP_ADDU_64:
 442         r =  cc_calc_addu_64(src, dst, vr);
 443         break;
 444     case CC_OP_ADDC_64:
 445         r =  cc_calc_addc_64(src, dst, vr);
 446         break;
 447     case CC_OP_SUB_64:
 448         r =  cc_calc_sub_64(src, dst, vr);
 449         break;
 450     case CC_OP_SUBU_64:
 451         r =  cc_calc_subu_64(src, dst, vr);
 452         break;
 453     case CC_OP_SUBB_64:
 454         r =  cc_calc_subb_64(src, dst, vr);
 455         break;
 456     case CC_OP_ABS_64:
 457         r =  cc_calc_abs_64(dst);
 458         break;
 459     case CC_OP_NABS_64:
 460         r =  cc_calc_nabs_64(dst);
 461         break;
 462     case CC_OP_COMP_64:
 463         r =  cc_calc_comp_64(dst);
 464         break;
 465
 466     case CC_OP_ADD_32:
 467         r =  cc_calc_add_32(src, dst, vr);
 468         break;
 469     case CC_OP_ADDU_32:
 470         r =  cc_calc_addu_32(src, dst, vr);
 471         break;
 472     case CC_OP_ADDC_32:
 473         r =  cc_calc_addc_32(src, dst, vr);
 474         break;
 475     case CC_OP_SUB_32:
 476         r =  cc_calc_sub_32(src, dst, vr);
 477         break;
 478     case CC_OP_SUBU_32:
 479         r =  cc_calc_subu_32(src, dst, vr);
 480         break;
 481     case CC_OP_SUBB_32:
 482         r =  cc_calc_subb_32(src, dst, vr);
 483         break;
 484     case CC_OP_ABS_32:
 485         r =  cc_calc_abs_32(dst);
 486         break;
 487     case CC_OP_NABS_32:
 488         r =  cc_calc_nabs_32(dst);
 489         break;
 490     case CC_OP_COMP_32:
 491         r =  cc_calc_comp_32(dst);
 492         break;
 493
 494     case CC_OP_ICM:
 495         r =  cc_calc_icm(src, dst);
 496         break;
 497     case CC_OP_SLA_32:
 498         r =  cc_calc_sla_32(src, dst);
 499         break;
 500     case CC_OP_SLA_64:
 501         r =  cc_calc_sla_64(src, dst);
 502         break;
 503     case CC_OP_FLOGR:
 504         r = cc_calc_flogr(dst);
 505         break;
 506
 507     case CC_OP_NZ_F32:
 508         r = set_cc_nz_f32(dst);
 509         break;
 510     case CC_OP_NZ_F64:
 511         r = set_cc_nz_f64(dst);
 512         break;
 513     case CC_OP_NZ_F128:
 514         r = set_cc_nz_f128(make_float128(src, dst));
 515         break;
 516
 517     default:
 518         cpu_abort(CPU(cpu), "Unknown CC operation: %s\n", cc_name(cc_op));
 519     }
 520
 521     HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__,
 522                cc_name(cc_op), src, dst, vr, r);
 523     return r;
 524 }
 525
 526 uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
 527                  uint64_t vr)
 528 {
 529     return do_calc_cc(env, cc_op, src, dst, vr);
 530 }
 531
 532 uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src,
 533                          uint64_t dst, uint64_t vr)
 534 {
 535     return do_calc_cc(env, cc_op, src, dst, vr);
 536 }
 537
 538 #ifndef CONFIG_USER_ONLY
 539 void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr)
 540 {
 541     load_psw(env, mask, addr);
 542     cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 543 }
 544
 545 void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
 546 {
 547     HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);
 548
 549     switch (a1 & 0xf00) {
 550     case 0x000:
 551         env->psw.mask &= ~PSW_MASK_ASC;
 552         env->psw.mask |= PSW_ASC_PRIMARY;
 553         break;
 554     case 0x100:
 555         env->psw.mask &= ~PSW_MASK_ASC;
 556         env->psw.mask |= PSW_ASC_SECONDARY;
 557         break;
 558     case 0x300:
 559         env->psw.mask &= ~PSW_MASK_ASC;
 560         env->psw.mask |= PSW_ASC_HOME;
 561         break;
 562     default:
 563         HELPER_LOG("unknown sacf mode: %" PRIx64 "\n", a1);
 564         program_interrupt(env, PGM_SPECIFICATION, 2);
 565         break;
 566     }
 567 }
 568 #endif