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 2.1 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 "internal.h"
  24 #include "exec/exec-all.h"
  25 #include "exec/helper-proto.h"
  26 #include "qemu/host-utils.h"
  27
  28 /* #define DEBUG_HELPER */
  29 #ifdef DEBUG_HELPER
  30 #define HELPER_LOG(x...) qemu_log(x)
  31 #else
  32 #define HELPER_LOG(x...)
  33 #endif
  34
  35 static uint32_t cc_calc_ltgt_32(int32_t src, int32_t dst)
  36 {
  37     if (src == dst) {
  38         return 0;
  39     } else if (src < dst) {
  40         return 1;
  41     } else {
  42         return 2;
  43     }
  44 }
  45
  46 static uint32_t cc_calc_ltgt0_32(int32_t dst)
  47 {
  48     return cc_calc_ltgt_32(dst, 0);
  49 }
  50
  51 static uint32_t cc_calc_ltgt_64(int64_t src, int64_t dst)
  52 {
  53     if (src == dst) {
  54         return 0;
  55     } else if (src < dst) {
  56         return 1;
  57     } else {
  58         return 2;
  59     }
  60 }
  61
  62 static uint32_t cc_calc_ltgt0_64(int64_t dst)
  63 {
  64     return cc_calc_ltgt_64(dst, 0);
  65 }
  66
  67 static uint32_t cc_calc_ltugtu_32(uint32_t src, uint32_t dst)
  68 {
  69     if (src == dst) {
  70         return 0;
  71     } else if (src < dst) {
  72         return 1;
  73     } else {
  74         return 2;
  75     }
  76 }
  77
  78 static uint32_t cc_calc_ltugtu_64(uint64_t src, uint64_t dst)
  79 {
  80     if (src == dst) {
  81         return 0;
  82     } else if (src < dst) {
  83         return 1;
  84     } else {
  85         return 2;
  86     }
  87 }
  88
  89 static uint32_t cc_calc_tm_32(uint32_t val, uint32_t mask)
  90 {
  91     uint32_t r = val & mask;
  92
  93     if (r == 0) {
  94         return 0;
  95     } else if (r == mask) {
  96         return 3;
  97     } else {
  98         return 1;
  99     }
 100 }
 101
 102 static uint32_t cc_calc_tm_64(uint64_t val, uint64_t mask)
 103 {
 104     uint64_t r = val & mask;
 105
 106     if (r == 0) {
 107         return 0;
 108     } else if (r == mask) {
 109         return 3;
 110     } else {
 111         int top = clz64(mask);
 112         if ((int64_t)(val << top) < 0) {
 113             return 2;
 114         } else {
 115             return 1;
 116         }
 117     }
 118 }
 119
 120 static uint32_t cc_calc_nz(uint64_t dst)
 121 {
 122     return !!dst;
 123 }
 124
 125 static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar)
 126 {
 127     if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
 128         return 3; /* overflow */
 129     } else {
 130         if (ar < 0) {
 131             return 1;
 132         } else if (ar > 0) {
 133             return 2;
 134         } else {
 135             return 0;
 136         }
 137     }
 138 }
 139
 140 static uint32_t cc_calc_addu_64(uint64_t a1, uint64_t a2, uint64_t ar)
 141 {
 142     return (ar != 0) + 2 * (ar < a1);
 143 }
 144
 145 static uint32_t cc_calc_addc_64(uint64_t a1, uint64_t a2, uint64_t ar)
 146 {
 147     /* Recover a2 + carry_in.  */
 148     uint64_t a2c = ar - a1;
 149     /* Check for a2+carry_in overflow, then a1+a2c overflow.  */
 150     int carry_out = (a2c < a2) || (ar < a1);
 151
 152     return (ar != 0) + 2 * carry_out;
 153 }
 154
 155 static uint32_t cc_calc_sub_64(int64_t a1, int64_t a2, int64_t ar)
 156 {
 157     if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
 158         return 3; /* overflow */
 159     } else {
 160         if (ar < 0) {
 161             return 1;
 162         } else if (ar > 0) {
 163             return 2;
 164         } else {
 165             return 0;
 166         }
 167     }
 168 }
 169
 170 static uint32_t cc_calc_subu_64(uint64_t a1, uint64_t a2, uint64_t ar)
 171 {
 172     if (ar == 0) {
 173         return 2;
 174     } else {
 175         if (a2 > a1) {
 176             return 1;
 177         } else {
 178             return 3;
 179         }
 180     }
 181 }
 182
 183 static uint32_t cc_calc_subb_64(uint64_t a1, uint64_t a2, uint64_t ar)
 184 {
 185     int borrow_out;
 186
 187     if (ar != a1 - a2) {        /* difference means borrow-in */
 188         borrow_out = (a2 >= a1);
 189     } else {
 190         borrow_out = (a2 > a1);
 191     }
 192
 193     return (ar != 0) + 2 * !borrow_out;
 194 }
 195
 196 static uint32_t cc_calc_abs_64(int64_t dst)
 197 {
 198     if ((uint64_t)dst == 0x8000000000000000ULL) {
 199         return 3;
 200     } else if (dst) {
 201         return 2;
 202     } else {
 203         return 0;
 204     }
 205 }
 206
 207 static uint32_t cc_calc_nabs_64(int64_t dst)
 208 {
 209     return !!dst;
 210 }
 211
 212 static uint32_t cc_calc_comp_64(int64_t dst)
 213 {
 214     if ((uint64_t)dst == 0x8000000000000000ULL) {
 215         return 3;
 216     } else if (dst < 0) {
 217         return 1;
 218     } else if (dst > 0) {
 219         return 2;
 220     } else {
 221         return 0;
 222     }
 223 }
 224
 225
 226 static uint32_t cc_calc_add_32(int32_t a1, int32_t a2, int32_t ar)
 227 {
 228     if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
 229         return 3; /* overflow */
 230     } else {
 231         if (ar < 0) {
 232             return 1;
 233         } else if (ar > 0) {
 234             return 2;
 235         } else {
 236             return 0;
 237         }
 238     }
 239 }
 240
 241 static uint32_t cc_calc_addu_32(uint32_t a1, uint32_t a2, uint32_t ar)
 242 {
 243     return (ar != 0) + 2 * (ar < a1);
 244 }
 245
 246 static uint32_t cc_calc_addc_32(uint32_t a1, uint32_t a2, uint32_t ar)
 247 {
 248     /* Recover a2 + carry_in.  */
 249     uint32_t a2c = ar - a1;
 250     /* Check for a2+carry_in overflow, then a1+a2c overflow.  */
 251     int carry_out = (a2c < a2) || (ar < a1);
 252
 253     return (ar != 0) + 2 * carry_out;
 254 }
 255
 256 static uint32_t cc_calc_sub_32(int32_t a1, int32_t a2, int32_t ar)
 257 {
 258     if ((a1 > 0 && a2 < 0 && ar < 0) || (a1 < 0 && a2 > 0 && ar > 0)) {
 259         return 3; /* overflow */
 260     } else {
 261         if (ar < 0) {
 262             return 1;
 263         } else if (ar > 0) {
 264             return 2;
 265         } else {
 266             return 0;
 267         }
 268     }
 269 }
 270
 271 static uint32_t cc_calc_subu_32(uint32_t a1, uint32_t a2, uint32_t ar)
 272 {
 273     if (ar == 0) {
 274         return 2;
 275     } else {
 276         if (a2 > a1) {
 277             return 1;
 278         } else {
 279             return 3;
 280         }
 281     }
 282 }
 283
 284 static uint32_t cc_calc_subb_32(uint32_t a1, uint32_t a2, uint32_t ar)
 285 {
 286     int borrow_out;
 287
 288     if (ar != a1 - a2) {        /* difference means borrow-in */
 289         borrow_out = (a2 >= a1);
 290     } else {
 291         borrow_out = (a2 > a1);
 292     }
 293
 294     return (ar != 0) + 2 * !borrow_out;
 295 }
 296
 297 static uint32_t cc_calc_abs_32(int32_t dst)
 298 {
 299     if ((uint32_t)dst == 0x80000000UL) {
 300         return 3;
 301     } else if (dst) {
 302         return 2;
 303     } else {
 304         return 0;
 305     }
 306 }
 307
 308 static uint32_t cc_calc_nabs_32(int32_t dst)
 309 {
 310     return !!dst;
 311 }
 312
 313 static uint32_t cc_calc_comp_32(int32_t dst)
 314 {
 315     if ((uint32_t)dst == 0x80000000UL) {
 316         return 3;
 317     } else if (dst < 0) {
 318         return 1;
 319     } else if (dst > 0) {
 320         return 2;
 321     } else {
 322         return 0;
 323     }
 324 }
 325
 326 /* calculate condition code for insert character under mask insn */
 327 static uint32_t cc_calc_icm(uint64_t mask, uint64_t val)
 328 {
 329     if ((val & mask) == 0) {
 330         return 0;
 331     } else {
 332         int top = clz64(mask);
 333         if ((int64_t)(val << top) < 0) {
 334             return 1;
 335         } else {
 336             return 2;
 337         }
 338     }
 339 }
 340
 341 static uint32_t cc_calc_sla_32(uint32_t src, int shift)
 342 {
 343     uint32_t mask = ((1U << shift) - 1U) << (32 - shift);
 344     uint32_t sign = 1U << 31;
 345     uint32_t match;
 346     int32_t r;
 347
 348     /* Check if the sign bit stays the same.  */
 349     if (src & sign) {
 350         match = mask;
 351     } else {
 352         match = 0;
 353     }
 354     if ((src & mask) != match) {
 355         /* Overflow.  */
 356         return 3;
 357     }
 358
 359     r = ((src << shift) & ~sign) | (src & sign);
 360     if (r == 0) {
 361         return 0;
 362     } else if (r < 0) {
 363         return 1;
 364     }
 365     return 2;
 366 }
 367
 368 static uint32_t cc_calc_sla_64(uint64_t src, int shift)
 369 {
 370     uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
 371     uint64_t sign = 1ULL << 63;
 372     uint64_t match;
 373     int64_t r;
 374
 375     /* Check if the sign bit stays the same.  */
 376     if (src & sign) {
 377         match = mask;
 378     } else {
 379         match = 0;
 380     }
 381     if ((src & mask) != match) {
 382         /* Overflow.  */
 383         return 3;
 384     }
 385
 386     r = ((src << shift) & ~sign) | (src & sign);
 387     if (r == 0) {
 388         return 0;
 389     } else if (r < 0) {
 390         return 1;
 391     }
 392     return 2;
 393 }
 394
 395 static uint32_t cc_calc_flogr(uint64_t dst)
 396 {
 397     return dst ? 2 : 0;
 398 }
 399
 400 static uint32_t do_calc_cc(CPUS390XState *env, uint32_t cc_op,
 401                                   uint64_t src, uint64_t dst, uint64_t vr)
 402 {
 403     S390CPU *cpu = s390_env_get_cpu(env);
 404     uint32_t r = 0;
 405
 406     switch (cc_op) {
 407     case CC_OP_CONST0:
 408     case CC_OP_CONST1:
 409     case CC_OP_CONST2:
 410     case CC_OP_CONST3:
 411         /* cc_op value _is_ cc */
 412         r = cc_op;
 413         break;
 414     case CC_OP_LTGT0_32:
 415         r = cc_calc_ltgt0_32(dst);
 416         break;
 417     case CC_OP_LTGT0_64:
 418         r =  cc_calc_ltgt0_64(dst);
 419         break;
 420     case CC_OP_LTGT_32:
 421         r =  cc_calc_ltgt_32(src, dst);
 422         break;
 423     case CC_OP_LTGT_64:
 424         r =  cc_calc_ltgt_64(src, dst);
 425         break;
 426     case CC_OP_LTUGTU_32:
 427         r =  cc_calc_ltugtu_32(src, dst);
 428         break;
 429     case CC_OP_LTUGTU_64:
 430         r =  cc_calc_ltugtu_64(src, dst);
 431         break;
 432     case CC_OP_TM_32:
 433         r =  cc_calc_tm_32(src, dst);
 434         break;
 435     case CC_OP_TM_64:
 436         r =  cc_calc_tm_64(src, dst);
 437         break;
 438     case CC_OP_NZ:
 439         r =  cc_calc_nz(dst);
 440         break;
 441     case CC_OP_ADD_64:
 442         r =  cc_calc_add_64(src, dst, vr);
 443         break;
 444     case CC_OP_ADDU_64:
 445         r =  cc_calc_addu_64(src, dst, vr);
 446         break;
 447     case CC_OP_ADDC_64:
 448         r =  cc_calc_addc_64(src, dst, vr);
 449         break;
 450     case CC_OP_SUB_64:
 451         r =  cc_calc_sub_64(src, dst, vr);
 452         break;
 453     case CC_OP_SUBU_64:
 454         r =  cc_calc_subu_64(src, dst, vr);
 455         break;
 456     case CC_OP_SUBB_64:
 457         r =  cc_calc_subb_64(src, dst, vr);
 458         break;
 459     case CC_OP_ABS_64:
 460         r =  cc_calc_abs_64(dst);
 461         break;
 462     case CC_OP_NABS_64:
 463         r =  cc_calc_nabs_64(dst);
 464         break;
 465     case CC_OP_COMP_64:
 466         r =  cc_calc_comp_64(dst);
 467         break;
 468
 469     case CC_OP_ADD_32:
 470         r =  cc_calc_add_32(src, dst, vr);
 471         break;
 472     case CC_OP_ADDU_32:
 473         r =  cc_calc_addu_32(src, dst, vr);
 474         break;
 475     case CC_OP_ADDC_32:
 476         r =  cc_calc_addc_32(src, dst, vr);
 477         break;
 478     case CC_OP_SUB_32:
 479         r =  cc_calc_sub_32(src, dst, vr);
 480         break;
 481     case CC_OP_SUBU_32:
 482         r =  cc_calc_subu_32(src, dst, vr);
 483         break;
 484     case CC_OP_SUBB_32:
 485         r =  cc_calc_subb_32(src, dst, vr);
 486         break;
 487     case CC_OP_ABS_32:
 488         r =  cc_calc_abs_32(dst);
 489         break;
 490     case CC_OP_NABS_32:
 491         r =  cc_calc_nabs_32(dst);
 492         break;
 493     case CC_OP_COMP_32:
 494         r =  cc_calc_comp_32(dst);
 495         break;
 496
 497     case CC_OP_ICM:
 498         r =  cc_calc_icm(src, dst);
 499         break;
 500     case CC_OP_SLA_32:
 501         r =  cc_calc_sla_32(src, dst);
 502         break;
 503     case CC_OP_SLA_64:
 504         r =  cc_calc_sla_64(src, dst);
 505         break;
 506     case CC_OP_FLOGR:
 507         r = cc_calc_flogr(dst);
 508         break;
 509
 510     case CC_OP_NZ_F32:
 511         r = set_cc_nz_f32(dst);
 512         break;
 513     case CC_OP_NZ_F64:
 514         r = set_cc_nz_f64(dst);
 515         break;
 516     case CC_OP_NZ_F128:
 517         r = set_cc_nz_f128(make_float128(src, dst));
 518         break;
 519
 520     default:
 521         cpu_abort(CPU(cpu), "Unknown CC operation: %s\n", cc_name(cc_op));
 522     }
 523
 524     HELPER_LOG("%s: %15s 0x%016lx 0x%016lx 0x%016lx = %d\n", __func__,
 525                cc_name(cc_op), src, dst, vr, r);
 526     return r;
 527 }
 528
 529 uint32_t calc_cc(CPUS390XState *env, uint32_t cc_op, uint64_t src, uint64_t dst,
 530                  uint64_t vr)
 531 {
 532     return do_calc_cc(env, cc_op, src, dst, vr);
 533 }
 534
 535 uint32_t HELPER(calc_cc)(CPUS390XState *env, uint32_t cc_op, uint64_t src,
 536                          uint64_t dst, uint64_t vr)
 537 {
 538     return do_calc_cc(env, cc_op, src, dst, vr);
 539 }
 540
 541 #ifndef CONFIG_USER_ONLY
 542 void HELPER(load_psw)(CPUS390XState *env, uint64_t mask, uint64_t addr)
 543 {
 544     load_psw(env, mask, addr);
 545     cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 546 }
 547
 548 void HELPER(sacf)(CPUS390XState *env, uint64_t a1)
 549 {
 550     HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1);
 551
 552     switch (a1 & 0xf00) {
 553     case 0x000:
 554         env->psw.mask &= ~PSW_MASK_ASC;
 555         env->psw.mask |= PSW_ASC_PRIMARY;
 556         break;
 557     case 0x100:
 558         env->psw.mask &= ~PSW_MASK_ASC;
 559         env->psw.mask |= PSW_ASC_SECONDARY;
 560         break;
 561     case 0x300:
 562         env->psw.mask &= ~PSW_MASK_ASC;
 563         env->psw.mask |= PSW_ASC_HOME;
 564         break;
 565     default:
 566         HELPER_LOG("unknown sacf mode: %" PRIx64 "\n", a1);
 567         s390_program_interrupt(env, PGM_SPECIFICATION, 2, GETPC());
 568         break;
 569     }
 570 }
 571 #endif