target/s390x/misc_helper.c

   1 /*
   2  *  S/390 misc 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 "qemu/osdep.h"
  22 #include "qemu/main-loop.h"
  23 #include "cpu.h"
  24 #include "internal.h"
  25 #include "exec/memory.h"
  26 #include "qemu/host-utils.h"
  27 #include "exec/helper-proto.h"
  28 #include "qemu/timer.h"
  29 #include "exec/address-spaces.h"
  30 #include "exec/exec-all.h"
  31 #include "exec/cpu_ldst.h"
  32
  33 #if !defined(CONFIG_USER_ONLY)
  34 #include "sysemu/cpus.h"
  35 #include "sysemu/sysemu.h"
  36 #include "hw/s390x/ebcdic.h"
  37 #include "hw/s390x/s390-virtio-hcall.h"
  38 #include "hw/s390x/sclp.h"
  39 #endif
  40
  41 /* #define DEBUG_HELPER */
  42 #ifdef DEBUG_HELPER
  43 #define HELPER_LOG(x...) qemu_log(x)
  44 #else
  45 #define HELPER_LOG(x...)
  46 #endif
  47
  48 /* Raise an exception dynamically from a helper function.  */
  49 void QEMU_NORETURN runtime_exception(CPUS390XState *env, int excp,
  50                                      uintptr_t retaddr)
  51 {
  52     CPUState *cs = CPU(s390_env_get_cpu(env));
  53
  54     cs->exception_index = EXCP_PGM;
  55     env->int_pgm_code = excp;
  56     env->int_pgm_ilen = ILEN_AUTO;
  57
  58     /* Use the (ultimate) callers address to find the insn that trapped.  */
  59     cpu_restore_state(cs, retaddr);
  60
  61     cpu_loop_exit(cs);
  62 }
  63
  64 /* Raise an exception statically from a TB.  */
  65 void HELPER(exception)(CPUS390XState *env, uint32_t excp)
  66 {
  67     CPUState *cs = CPU(s390_env_get_cpu(env));
  68
  69     HELPER_LOG("%s: exception %d\n", __func__, excp);
  70     cs->exception_index = excp;
  71     cpu_loop_exit(cs);
  72 }
  73
  74 #ifndef CONFIG_USER_ONLY
  75
  76 /* SCLP service call */
  77 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
  78 {
  79     qemu_mutex_lock_iothread();
  80     int r = sclp_service_call(env, r1, r2);
  81     if (r < 0) {
  82         program_interrupt(env, -r, 4);
  83         r = 0;
  84     }
  85     qemu_mutex_unlock_iothread();
  86     return r;
  87 }
  88
  89 void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
  90 {
  91     uint64_t r;
  92
  93     switch (num) {
  94     case 0x500:
  95         /* KVM hypercall */
  96         qemu_mutex_lock_iothread();
  97         r = s390_virtio_hypercall(env);
  98         qemu_mutex_unlock_iothread();
  99         break;
 100     case 0x44:
 101         /* yield */
 102         r = 0;
 103         break;
 104     case 0x308:
 105         /* ipl */
 106         handle_diag_308(env, r1, r3);
 107         r = 0;
 108         break;
 109     case 0x288:
 110         /* time bomb (watchdog) */
 111         r = handle_diag_288(env, r1, r3);
 112         break;
 113     default:
 114         r = -1;
 115         break;
 116     }
 117
 118     if (r) {
 119         program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 120     }
 121 }
 122
 123 /* Set Prefix */
 124 void HELPER(spx)(CPUS390XState *env, uint64_t a1)
 125 {
 126     CPUState *cs = CPU(s390_env_get_cpu(env));
 127     uint32_t prefix = a1 & 0x7fffe000;
 128
 129     env->psa = prefix;
 130     HELPER_LOG("prefix: %#x\n", prefix);
 131     tlb_flush_page(cs, 0);
 132     tlb_flush_page(cs, TARGET_PAGE_SIZE);
 133 }
 134
 135 /* Store Clock */
 136 uint64_t HELPER(stck)(CPUS390XState *env)
 137 {
 138     uint64_t time;
 139
 140     time = env->tod_offset +
 141         time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - env->tod_basetime);
 142
 143     return time;
 144 }
 145
 146 /* Set Clock Comparator */
 147 void HELPER(sckc)(CPUS390XState *env, uint64_t time)
 148 {
 149     if (time == -1ULL) {
 150         return;
 151     }
 152
 153     env->ckc = time;
 154
 155     /* difference between origins */
 156     time -= env->tod_offset;
 157
 158     /* nanoseconds */
 159     time = tod2time(time);
 160
 161     timer_mod(env->tod_timer, env->tod_basetime + time);
 162 }
 163
 164 /* Store Clock Comparator */
 165 uint64_t HELPER(stckc)(CPUS390XState *env)
 166 {
 167     return env->ckc;
 168 }
 169
 170 /* Set CPU Timer */
 171 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 172 {
 173     if (time == -1ULL) {
 174         return;
 175     }
 176
 177     /* nanoseconds */
 178     time = tod2time(time);
 179
 180     env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
 181
 182     timer_mod(env->cpu_timer, env->cputm);
 183 }
 184
 185 /* Store CPU Timer */
 186 uint64_t HELPER(stpt)(CPUS390XState *env)
 187 {
 188     return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 189 }
 190
 191 /* Store System Information */
 192 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 193                       uint64_t r0, uint64_t r1)
 194 {
 195     S390CPU *cpu = s390_env_get_cpu(env);
 196     int cc = 0;
 197     int sel1, sel2;
 198
 199     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 200         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 201         /* valid function code, invalid reserved bits */
 202         program_interrupt(env, PGM_SPECIFICATION, 4);
 203     }
 204
 205     sel1 = r0 & STSI_R0_SEL1_MASK;
 206     sel2 = r1 & STSI_R1_SEL2_MASK;
 207
 208     /* XXX: spec exception if sysib is not 4k-aligned */
 209
 210     switch (r0 & STSI_LEVEL_MASK) {
 211     case STSI_LEVEL_1:
 212         if ((sel1 == 1) && (sel2 == 1)) {
 213             /* Basic Machine Configuration */
 214             struct sysib_111 sysib;
 215             char type[5] = {};
 216
 217             memset(&sysib, 0, sizeof(sysib));
 218             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 219             /* same as machine type number in STORE CPU ID, but in EBCDIC */
 220             snprintf(type, ARRAY_SIZE(type), "%X", cpu->model->def->type);
 221             ebcdic_put(sysib.type, type, 4);
 222             /* model number (not stored in STORE CPU ID for z/Architecure) */
 223             ebcdic_put(sysib.model, "QEMU            ", 16);
 224             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 225             ebcdic_put(sysib.plant, "QEMU", 4);
 226             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 227         } else if ((sel1 == 2) && (sel2 == 1)) {
 228             /* Basic Machine CPU */
 229             struct sysib_121 sysib;
 230
 231             memset(&sysib, 0, sizeof(sysib));
 232             /* XXX make different for different CPUs? */
 233             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 234             ebcdic_put(sysib.plant, "QEMU", 4);
 235             stw_p(&sysib.cpu_addr, env->core_id);
 236             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 237         } else if ((sel1 == 2) && (sel2 == 2)) {
 238             /* Basic Machine CPUs */
 239             struct sysib_122 sysib;
 240
 241             memset(&sysib, 0, sizeof(sysib));
 242             stl_p(&sysib.capability, 0x443afc29);
 243             /* XXX change when SMP comes */
 244             stw_p(&sysib.total_cpus, 1);
 245             stw_p(&sysib.active_cpus, 1);
 246             stw_p(&sysib.standby_cpus, 0);
 247             stw_p(&sysib.reserved_cpus, 0);
 248             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 249         } else {
 250             cc = 3;
 251         }
 252         break;
 253     case STSI_LEVEL_2:
 254         {
 255             if ((sel1 == 2) && (sel2 == 1)) {
 256                 /* LPAR CPU */
 257                 struct sysib_221 sysib;
 258
 259                 memset(&sysib, 0, sizeof(sysib));
 260                 /* XXX make different for different CPUs? */
 261                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 262                 ebcdic_put(sysib.plant, "QEMU", 4);
 263                 stw_p(&sysib.cpu_addr, env->core_id);
 264                 stw_p(&sysib.cpu_id, 0);
 265                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 266             } else if ((sel1 == 2) && (sel2 == 2)) {
 267                 /* LPAR CPUs */
 268                 struct sysib_222 sysib;
 269
 270                 memset(&sysib, 0, sizeof(sysib));
 271                 stw_p(&sysib.lpar_num, 0);
 272                 sysib.lcpuc = 0;
 273                 /* XXX change when SMP comes */
 274                 stw_p(&sysib.total_cpus, 1);
 275                 stw_p(&sysib.conf_cpus, 1);
 276                 stw_p(&sysib.standby_cpus, 0);
 277                 stw_p(&sysib.reserved_cpus, 0);
 278                 ebcdic_put(sysib.name, "QEMU    ", 8);
 279                 stl_p(&sysib.caf, 1000);
 280                 stw_p(&sysib.dedicated_cpus, 0);
 281                 stw_p(&sysib.shared_cpus, 0);
 282                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 283             } else {
 284                 cc = 3;
 285             }
 286             break;
 287         }
 288     case STSI_LEVEL_3:
 289         {
 290             if ((sel1 == 2) && (sel2 == 2)) {
 291                 /* VM CPUs */
 292                 struct sysib_322 sysib;
 293
 294                 memset(&sysib, 0, sizeof(sysib));
 295                 sysib.count = 1;
 296                 /* XXX change when SMP comes */
 297                 stw_p(&sysib.vm[0].total_cpus, 1);
 298                 stw_p(&sysib.vm[0].conf_cpus, 1);
 299                 stw_p(&sysib.vm[0].standby_cpus, 0);
 300                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 301                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 302                 stl_p(&sysib.vm[0].caf, 1000);
 303                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 304                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 305             } else {
 306                 cc = 3;
 307             }
 308             break;
 309         }
 310     case STSI_LEVEL_CURRENT:
 311         env->regs[0] = STSI_LEVEL_3;
 312         break;
 313     default:
 314         cc = 3;
 315         break;
 316     }
 317
 318     return cc;
 319 }
 320
 321 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 322                       uint64_t cpu_addr)
 323 {
 324     int cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 325
 326     HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
 327                __func__, order_code, r1, cpu_addr);
 328
 329     /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
 330        as parameter (input). Status (output) is always R1. */
 331
 332     switch (order_code & SIGP_ORDER_MASK) {
 333     case SIGP_SET_ARCH:
 334         /* switch arch */
 335         break;
 336     case SIGP_SENSE:
 337         /* enumerate CPU status */
 338         if (cpu_addr) {
 339             /* XXX implement when SMP comes */
 340             return 3;
 341         }
 342         env->regs[r1] &= 0xffffffff00000000ULL;
 343         cc = 1;
 344         break;
 345 #if !defined(CONFIG_USER_ONLY)
 346     case SIGP_RESTART:
 347         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
 348         cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 349         break;
 350     case SIGP_STOP:
 351         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 352         cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 353         break;
 354 #endif
 355     default:
 356         /* unknown sigp */
 357         fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
 358         cc = SIGP_CC_NOT_OPERATIONAL;
 359     }
 360
 361     return cc;
 362 }
 363 #endif
 364
 365 #ifndef CONFIG_USER_ONLY
 366 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 367 {
 368     S390CPU *cpu = s390_env_get_cpu(env);
 369     qemu_mutex_lock_iothread();
 370     ioinst_handle_xsch(cpu, r1);
 371     qemu_mutex_unlock_iothread();
 372 }
 373
 374 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 375 {
 376     S390CPU *cpu = s390_env_get_cpu(env);
 377     qemu_mutex_lock_iothread();
 378     ioinst_handle_csch(cpu, r1);
 379     qemu_mutex_unlock_iothread();
 380 }
 381
 382 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 383 {
 384     S390CPU *cpu = s390_env_get_cpu(env);
 385     qemu_mutex_lock_iothread();
 386     ioinst_handle_hsch(cpu, r1);
 387     qemu_mutex_unlock_iothread();
 388 }
 389
 390 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 391 {
 392     S390CPU *cpu = s390_env_get_cpu(env);
 393     qemu_mutex_lock_iothread();
 394     ioinst_handle_msch(cpu, r1, inst >> 16);
 395     qemu_mutex_unlock_iothread();
 396 }
 397
 398 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 399 {
 400     S390CPU *cpu = s390_env_get_cpu(env);
 401     qemu_mutex_lock_iothread();
 402     ioinst_handle_rchp(cpu, r1);
 403     qemu_mutex_unlock_iothread();
 404 }
 405
 406 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 407 {
 408     S390CPU *cpu = s390_env_get_cpu(env);
 409     qemu_mutex_lock_iothread();
 410     ioinst_handle_rsch(cpu, r1);
 411     qemu_mutex_unlock_iothread();
 412 }
 413
 414 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 415 {
 416     S390CPU *cpu = s390_env_get_cpu(env);
 417     qemu_mutex_lock_iothread();
 418     ioinst_handle_ssch(cpu, r1, inst >> 16);
 419     qemu_mutex_unlock_iothread();
 420 }
 421
 422 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 423 {
 424     S390CPU *cpu = s390_env_get_cpu(env);
 425     qemu_mutex_lock_iothread();
 426     ioinst_handle_stsch(cpu, r1, inst >> 16);
 427     qemu_mutex_unlock_iothread();
 428 }
 429
 430 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 431 {
 432     S390CPU *cpu = s390_env_get_cpu(env);
 433     qemu_mutex_lock_iothread();
 434     ioinst_handle_tsch(cpu, r1, inst >> 16);
 435     qemu_mutex_unlock_iothread();
 436 }
 437
 438 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 439 {
 440     S390CPU *cpu = s390_env_get_cpu(env);
 441     qemu_mutex_lock_iothread();
 442     ioinst_handle_chsc(cpu, inst >> 16);
 443     qemu_mutex_unlock_iothread();
 444 }
 445 #endif
 446
 447 #ifndef CONFIG_USER_ONLY
 448 void HELPER(per_check_exception)(CPUS390XState *env)
 449 {
 450     uint32_t ilen;
 451
 452     if (env->per_perc_atmid) {
 453         /*
 454          * FIXME: ILEN_AUTO is most probably the right thing to use. ilen
 455          * always has to match the instruction referenced in the PSW. E.g.
 456          * if a PER interrupt is triggered via EXECUTE, we have to use ilen
 457          * of EXECUTE, while per_address contains the target of EXECUTE.
 458          */
 459         ilen = get_ilen(cpu_ldub_code(env, env->per_address));
 460         program_interrupt(env, PGM_PER, ilen);
 461     }
 462 }
 463
 464 /* Check if an address is within the PER starting address and the PER
 465    ending address.  The address range might loop.  */
 466 static inline bool get_per_in_range(CPUS390XState *env, uint64_t addr)
 467 {
 468     if (env->cregs[10] <= env->cregs[11]) {
 469         return env->cregs[10] <= addr && addr <= env->cregs[11];
 470     } else {
 471         return env->cregs[10] <= addr || addr <= env->cregs[11];
 472     }
 473 }
 474
 475 void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
 476 {
 477     if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
 478         if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
 479             || get_per_in_range(env, to)) {
 480             env->per_address = from;
 481             env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
 482         }
 483     }
 484 }
 485
 486 void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
 487 {
 488     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
 489         env->per_address = addr;
 490         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
 491
 492         /* If the instruction has to be nullified, trigger the
 493            exception immediately. */
 494         if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
 495             CPUState *cs = CPU(s390_env_get_cpu(env));
 496
 497             env->per_perc_atmid |= PER_CODE_EVENT_NULLIFICATION;
 498             env->int_pgm_code = PGM_PER;
 499             env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
 500
 501             cs->exception_index = EXCP_PGM;
 502             cpu_loop_exit(cs);
 503         }
 504     }
 505 }
 506 #endif
 507
 508 /* The maximum bit defined at the moment is 129.  */
 509 #define MAX_STFL_WORDS  3
 510
 511 /* Canonicalize the current cpu's features into the 64-bit words required
 512    by STFLE.  Return the index-1 of the max word that is non-zero.  */
 513 static unsigned do_stfle(CPUS390XState *env, uint64_t words[MAX_STFL_WORDS])
 514 {
 515     S390CPU *cpu = s390_env_get_cpu(env);
 516     const unsigned long *features = cpu->model->features;
 517     unsigned max_bit = 0;
 518     S390Feat feat;
 519
 520     memset(words, 0, sizeof(uint64_t) * MAX_STFL_WORDS);
 521
 522     if (test_bit(S390_FEAT_ZARCH, features)) {
 523         /* z/Architecture is always active if around */
 524         words[0] = 1ull << (63 - 2);
 525     }
 526
 527     for (feat = find_first_bit(features, S390_FEAT_MAX);
 528          feat < S390_FEAT_MAX;
 529          feat = find_next_bit(features, S390_FEAT_MAX, feat + 1)) {
 530         const S390FeatDef *def = s390_feat_def(feat);
 531         if (def->type == S390_FEAT_TYPE_STFL) {
 532             unsigned bit = def->bit;
 533             if (bit > max_bit) {
 534                 max_bit = bit;
 535             }
 536             assert(bit / 64 < MAX_STFL_WORDS);
 537             words[bit / 64] |= 1ULL << (63 - bit % 64);
 538         }
 539     }
 540
 541     return max_bit / 64;
 542 }
 543
 544 void HELPER(stfl)(CPUS390XState *env)
 545 {
 546     uint64_t words[MAX_STFL_WORDS];
 547
 548     do_stfle(env, words);
 549     cpu_stl_data(env, 200, words[0] >> 32);
 550 }
 551
 552 uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
 553 {
 554     uint64_t words[MAX_STFL_WORDS];
 555     unsigned count_m1 = env->regs[0] & 0xff;
 556     unsigned max_m1 = do_stfle(env, words);
 557     unsigned i;
 558
 559     for (i = 0; i <= count_m1; ++i) {
 560         cpu_stq_data(env, addr + 8 * i, words[i]);
 561     }
 562
 563     env->regs[0] = deposit64(env->regs[0], 0, 8, max_m1);
 564     return (count_m1 >= max_m1 ? 0 : 3);
 565 }