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 statically from a TB.  */
  49 void HELPER(exception)(CPUS390XState *env, uint32_t excp)
  50 {
  51     CPUState *cs = CPU(s390_env_get_cpu(env));
  52
  53     HELPER_LOG("%s: exception %d\n", __func__, excp);
  54     cs->exception_index = excp;
  55     cpu_loop_exit(cs);
  56 }
  57
  58 /* Store CPU Timer (also used for EXTRACT CPU TIME) */
  59 uint64_t HELPER(stpt)(CPUS390XState *env)
  60 {
  61 #if defined(CONFIG_USER_ONLY)
  62     /*
  63      * Fake a descending CPU timer. We could get negative values here,
  64      * but we don't care as it is up to the OS when to process that
  65      * interrupt and reset to > 0.
  66      */
  67     return UINT64_MAX - (uint64_t)cpu_get_host_ticks();
  68 #else
  69     return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
  70 #endif
  71 }
  72
  73 #ifndef CONFIG_USER_ONLY
  74
  75 /* SCLP service call */
  76 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
  77 {
  78     qemu_mutex_lock_iothread();
  79     int r = sclp_service_call(env, r1, r2);
  80     qemu_mutex_unlock_iothread();
  81     if (r < 0) {
  82         s390_program_interrupt(env, -r, 4, GETPC());
  83     }
  84     return r;
  85 }
  86
  87 void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
  88 {
  89     uint64_t r;
  90
  91     switch (num) {
  92     case 0x500:
  93         /* KVM hypercall */
  94         qemu_mutex_lock_iothread();
  95         r = s390_virtio_hypercall(env);
  96         qemu_mutex_unlock_iothread();
  97         break;
  98     case 0x44:
  99         /* yield */
 100         r = 0;
 101         break;
 102     case 0x308:
 103         /* ipl */
 104         qemu_mutex_lock_iothread();
 105         handle_diag_308(env, r1, r3, GETPC());
 106         qemu_mutex_unlock_iothread();
 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         s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, GETPC());
 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 /* Set Tod Programmable Field */
 165 void HELPER(sckpf)(CPUS390XState *env, uint64_t r0)
 166 {
 167     uint32_t val = r0;
 168
 169     if (val & 0xffff0000) {
 170         s390_program_interrupt(env, PGM_SPECIFICATION, 2, GETPC());
 171     }
 172     env->todpr = val;
 173 }
 174
 175 /* Store Clock Comparator */
 176 uint64_t HELPER(stckc)(CPUS390XState *env)
 177 {
 178     return env->ckc;
 179 }
 180
 181 /* Set CPU Timer */
 182 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 183 {
 184     if (time == -1ULL) {
 185         return;
 186     }
 187
 188     /* nanoseconds */
 189     time = tod2time(time);
 190
 191     env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
 192
 193     timer_mod(env->cpu_timer, env->cputm);
 194 }
 195
 196 /* Store System Information */
 197 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 198                       uint64_t r0, uint64_t r1)
 199 {
 200     S390CPU *cpu = s390_env_get_cpu(env);
 201     int cc = 0;
 202     int sel1, sel2;
 203
 204     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 205         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 206         /* valid function code, invalid reserved bits */
 207         s390_program_interrupt(env, PGM_SPECIFICATION, 4, GETPC());
 208     }
 209
 210     sel1 = r0 & STSI_R0_SEL1_MASK;
 211     sel2 = r1 & STSI_R1_SEL2_MASK;
 212
 213     /* XXX: spec exception if sysib is not 4k-aligned */
 214
 215     switch (r0 & STSI_LEVEL_MASK) {
 216     case STSI_LEVEL_1:
 217         if ((sel1 == 1) && (sel2 == 1)) {
 218             /* Basic Machine Configuration */
 219             struct sysib_111 sysib;
 220             char type[5] = {};
 221
 222             memset(&sysib, 0, sizeof(sysib));
 223             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 224             /* same as machine type number in STORE CPU ID, but in EBCDIC */
 225             snprintf(type, ARRAY_SIZE(type), "%X", cpu->model->def->type);
 226             ebcdic_put(sysib.type, type, 4);
 227             /* model number (not stored in STORE CPU ID for z/Architecure) */
 228             ebcdic_put(sysib.model, "QEMU            ", 16);
 229             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 230             ebcdic_put(sysib.plant, "QEMU", 4);
 231             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 232         } else if ((sel1 == 2) && (sel2 == 1)) {
 233             /* Basic Machine CPU */
 234             struct sysib_121 sysib;
 235
 236             memset(&sysib, 0, sizeof(sysib));
 237             /* XXX make different for different CPUs? */
 238             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 239             ebcdic_put(sysib.plant, "QEMU", 4);
 240             stw_p(&sysib.cpu_addr, env->core_id);
 241             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 242         } else if ((sel1 == 2) && (sel2 == 2)) {
 243             /* Basic Machine CPUs */
 244             struct sysib_122 sysib;
 245
 246             memset(&sysib, 0, sizeof(sysib));
 247             stl_p(&sysib.capability, 0x443afc29);
 248             /* XXX change when SMP comes */
 249             stw_p(&sysib.total_cpus, 1);
 250             stw_p(&sysib.active_cpus, 1);
 251             stw_p(&sysib.standby_cpus, 0);
 252             stw_p(&sysib.reserved_cpus, 0);
 253             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 254         } else {
 255             cc = 3;
 256         }
 257         break;
 258     case STSI_LEVEL_2:
 259         {
 260             if ((sel1 == 2) && (sel2 == 1)) {
 261                 /* LPAR CPU */
 262                 struct sysib_221 sysib;
 263
 264                 memset(&sysib, 0, sizeof(sysib));
 265                 /* XXX make different for different CPUs? */
 266                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 267                 ebcdic_put(sysib.plant, "QEMU", 4);
 268                 stw_p(&sysib.cpu_addr, env->core_id);
 269                 stw_p(&sysib.cpu_id, 0);
 270                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 271             } else if ((sel1 == 2) && (sel2 == 2)) {
 272                 /* LPAR CPUs */
 273                 struct sysib_222 sysib;
 274
 275                 memset(&sysib, 0, sizeof(sysib));
 276                 stw_p(&sysib.lpar_num, 0);
 277                 sysib.lcpuc = 0;
 278                 /* XXX change when SMP comes */
 279                 stw_p(&sysib.total_cpus, 1);
 280                 stw_p(&sysib.conf_cpus, 1);
 281                 stw_p(&sysib.standby_cpus, 0);
 282                 stw_p(&sysib.reserved_cpus, 0);
 283                 ebcdic_put(sysib.name, "QEMU    ", 8);
 284                 stl_p(&sysib.caf, 1000);
 285                 stw_p(&sysib.dedicated_cpus, 0);
 286                 stw_p(&sysib.shared_cpus, 0);
 287                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 288             } else {
 289                 cc = 3;
 290             }
 291             break;
 292         }
 293     case STSI_LEVEL_3:
 294         {
 295             if ((sel1 == 2) && (sel2 == 2)) {
 296                 /* VM CPUs */
 297                 struct sysib_322 sysib;
 298
 299                 memset(&sysib, 0, sizeof(sysib));
 300                 sysib.count = 1;
 301                 /* XXX change when SMP comes */
 302                 stw_p(&sysib.vm[0].total_cpus, 1);
 303                 stw_p(&sysib.vm[0].conf_cpus, 1);
 304                 stw_p(&sysib.vm[0].standby_cpus, 0);
 305                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 306                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 307                 stl_p(&sysib.vm[0].caf, 1000);
 308                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 309                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 310             } else {
 311                 cc = 3;
 312             }
 313             break;
 314         }
 315     case STSI_LEVEL_CURRENT:
 316         env->regs[0] = STSI_LEVEL_3;
 317         break;
 318     default:
 319         cc = 3;
 320         break;
 321     }
 322
 323     return cc;
 324 }
 325
 326 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 327                       uint32_t r3)
 328 {
 329     int cc;
 330
 331     /* TODO: needed to inject interrupts  - push further down */
 332     qemu_mutex_lock_iothread();
 333     cc = handle_sigp(env, order_code & SIGP_ORDER_MASK, r1, r3);
 334     qemu_mutex_unlock_iothread();
 335
 336     return cc;
 337 }
 338 #endif
 339
 340 #ifndef CONFIG_USER_ONLY
 341 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 342 {
 343     S390CPU *cpu = s390_env_get_cpu(env);
 344     qemu_mutex_lock_iothread();
 345     ioinst_handle_xsch(cpu, r1, GETPC());
 346     qemu_mutex_unlock_iothread();
 347 }
 348
 349 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 350 {
 351     S390CPU *cpu = s390_env_get_cpu(env);
 352     qemu_mutex_lock_iothread();
 353     ioinst_handle_csch(cpu, r1, GETPC());
 354     qemu_mutex_unlock_iothread();
 355 }
 356
 357 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 358 {
 359     S390CPU *cpu = s390_env_get_cpu(env);
 360     qemu_mutex_lock_iothread();
 361     ioinst_handle_hsch(cpu, r1, GETPC());
 362     qemu_mutex_unlock_iothread();
 363 }
 364
 365 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 366 {
 367     S390CPU *cpu = s390_env_get_cpu(env);
 368     qemu_mutex_lock_iothread();
 369     ioinst_handle_msch(cpu, r1, inst >> 16, GETPC());
 370     qemu_mutex_unlock_iothread();
 371 }
 372
 373 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 374 {
 375     S390CPU *cpu = s390_env_get_cpu(env);
 376     qemu_mutex_lock_iothread();
 377     ioinst_handle_rchp(cpu, r1, GETPC());
 378     qemu_mutex_unlock_iothread();
 379 }
 380
 381 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 382 {
 383     S390CPU *cpu = s390_env_get_cpu(env);
 384     qemu_mutex_lock_iothread();
 385     ioinst_handle_rsch(cpu, r1, GETPC());
 386     qemu_mutex_unlock_iothread();
 387 }
 388
 389 void HELPER(sal)(CPUS390XState *env, uint64_t r1)
 390 {
 391     S390CPU *cpu = s390_env_get_cpu(env);
 392
 393     qemu_mutex_lock_iothread();
 394     ioinst_handle_sal(cpu, r1, GETPC());
 395     qemu_mutex_unlock_iothread();
 396 }
 397
 398 void HELPER(schm)(CPUS390XState *env, uint64_t r1, uint64_t r2, uint64_t inst)
 399 {
 400     S390CPU *cpu = s390_env_get_cpu(env);
 401
 402     qemu_mutex_lock_iothread();
 403     ioinst_handle_schm(cpu, r1, r2, inst >> 16, GETPC());
 404     qemu_mutex_unlock_iothread();
 405 }
 406
 407 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 408 {
 409     S390CPU *cpu = s390_env_get_cpu(env);
 410     qemu_mutex_lock_iothread();
 411     ioinst_handle_ssch(cpu, r1, inst >> 16, GETPC());
 412     qemu_mutex_unlock_iothread();
 413 }
 414
 415 void HELPER(stcrw)(CPUS390XState *env, uint64_t inst)
 416 {
 417     S390CPU *cpu = s390_env_get_cpu(env);
 418
 419     qemu_mutex_lock_iothread();
 420     ioinst_handle_stcrw(cpu, inst >> 16, GETPC());
 421     qemu_mutex_unlock_iothread();
 422 }
 423
 424 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 425 {
 426     S390CPU *cpu = s390_env_get_cpu(env);
 427     qemu_mutex_lock_iothread();
 428     ioinst_handle_stsch(cpu, r1, inst >> 16, GETPC());
 429     qemu_mutex_unlock_iothread();
 430 }
 431
 432 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 433 {
 434     S390CPU *cpu = s390_env_get_cpu(env);
 435     qemu_mutex_lock_iothread();
 436     ioinst_handle_tsch(cpu, r1, inst >> 16, GETPC());
 437     qemu_mutex_unlock_iothread();
 438 }
 439
 440 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 441 {
 442     S390CPU *cpu = s390_env_get_cpu(env);
 443     qemu_mutex_lock_iothread();
 444     ioinst_handle_chsc(cpu, inst >> 16, GETPC());
 445     qemu_mutex_unlock_iothread();
 446 }
 447 #endif
 448
 449 #ifndef CONFIG_USER_ONLY
 450 void HELPER(per_check_exception)(CPUS390XState *env)
 451 {
 452     uint32_t ilen;
 453
 454     if (env->per_perc_atmid) {
 455         /*
 456          * FIXME: ILEN_AUTO is most probably the right thing to use. ilen
 457          * always has to match the instruction referenced in the PSW. E.g.
 458          * if a PER interrupt is triggered via EXECUTE, we have to use ilen
 459          * of EXECUTE, while per_address contains the target of EXECUTE.
 460          */
 461         ilen = get_ilen(cpu_ldub_code(env, env->per_address));
 462         s390_program_interrupt(env, PGM_PER, ilen, GETPC());
 463     }
 464 }
 465
 466 /* Check if an address is within the PER starting address and the PER
 467    ending address.  The address range might loop.  */
 468 static inline bool get_per_in_range(CPUS390XState *env, uint64_t addr)
 469 {
 470     if (env->cregs[10] <= env->cregs[11]) {
 471         return env->cregs[10] <= addr && addr <= env->cregs[11];
 472     } else {
 473         return env->cregs[10] <= addr || addr <= env->cregs[11];
 474     }
 475 }
 476
 477 void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
 478 {
 479     if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
 480         if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
 481             || get_per_in_range(env, to)) {
 482             env->per_address = from;
 483             env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
 484         }
 485     }
 486 }
 487
 488 void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
 489 {
 490     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
 491         env->per_address = addr;
 492         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
 493
 494         /* If the instruction has to be nullified, trigger the
 495            exception immediately. */
 496         if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
 497             CPUState *cs = CPU(s390_env_get_cpu(env));
 498
 499             env->per_perc_atmid |= PER_CODE_EVENT_NULLIFICATION;
 500             env->int_pgm_code = PGM_PER;
 501             env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
 502
 503             cs->exception_index = EXCP_PGM;
 504             cpu_loop_exit(cs);
 505         }
 506     }
 507 }
 508 #endif
 509
 510 static uint8_t stfl_bytes[2048];
 511 static unsigned int used_stfl_bytes;
 512
 513 static void prepare_stfl(void)
 514 {
 515     static bool initialized;
 516     int i;
 517
 518     /* racy, but we don't care, the same values are always written */
 519     if (initialized) {
 520         return;
 521     }
 522
 523     s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
 524     for (i = 0; i < sizeof(stfl_bytes); i++) {
 525         if (stfl_bytes[i]) {
 526             used_stfl_bytes = i + 1;
 527         }
 528     }
 529     initialized = true;
 530 }
 531
 532 #ifndef CONFIG_USER_ONLY
 533 void HELPER(stfl)(CPUS390XState *env)
 534 {
 535     LowCore *lowcore;
 536
 537     lowcore = cpu_map_lowcore(env);
 538     prepare_stfl();
 539     memcpy(&lowcore->stfl_fac_list, stfl_bytes, sizeof(lowcore->stfl_fac_list));
 540     cpu_unmap_lowcore(lowcore);
 541 }
 542 #endif
 543
 544 uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
 545 {
 546     const uintptr_t ra = GETPC();
 547     const int count_bytes = ((env->regs[0] & 0xff) + 1) * 8;
 548     const int max_bytes = ROUND_UP(used_stfl_bytes, 8);
 549     int i;
 550
 551     if (addr & 0x7) {
 552         s390_program_interrupt(env, PGM_SPECIFICATION, 4, ra);
 553     }
 554
 555     prepare_stfl();
 556     for (i = 0; i < count_bytes; ++i) {
 557         cpu_stb_data_ra(env, addr + i, stfl_bytes[i], ra);
 558     }
 559
 560     env->regs[0] = deposit64(env->regs[0], 0, 8, (max_bytes / 8) - 1);
 561     return count_bytes >= max_bytes ? 0 : 3;
 562 }