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 "exec/memory.h"
  25 #include "qemu/host-utils.h"
  26 #include "exec/helper-proto.h"
  27 #include "qemu/timer.h"
  28 #include "exec/address-spaces.h"
  29 #include "exec/exec-all.h"
  30 #include "exec/cpu_ldst.h"
  31
  32 #if !defined(CONFIG_USER_ONLY)
  33 #include "sysemu/cpus.h"
  34 #include "sysemu/sysemu.h"
  35 #include "hw/s390x/ebcdic.h"
  36 #endif
  37
  38 /* #define DEBUG_HELPER */
  39 #ifdef DEBUG_HELPER
  40 #define HELPER_LOG(x...) qemu_log(x)
  41 #else
  42 #define HELPER_LOG(x...)
  43 #endif
  44
  45 /* Raise an exception dynamically from a helper function.  */
  46 void QEMU_NORETURN runtime_exception(CPUS390XState *env, int excp,
  47                                      uintptr_t retaddr)
  48 {
  49     CPUState *cs = CPU(s390_env_get_cpu(env));
  50
  51     cs->exception_index = EXCP_PGM;
  52     env->int_pgm_code = excp;
  53     env->int_pgm_ilen = ILEN_AUTO;
  54
  55     /* Use the (ultimate) callers address to find the insn that trapped.  */
  56     cpu_restore_state(cs, retaddr);
  57
  58     cpu_loop_exit(cs);
  59 }
  60
  61 /* Raise an exception statically from a TB.  */
  62 void HELPER(exception)(CPUS390XState *env, uint32_t excp)
  63 {
  64     CPUState *cs = CPU(s390_env_get_cpu(env));
  65
  66     HELPER_LOG("%s: exception %d\n", __func__, excp);
  67     cs->exception_index = excp;
  68     cpu_loop_exit(cs);
  69 }
  70
  71 void program_interrupt(CPUS390XState *env, uint32_t code, int ilen)
  72 {
  73     S390CPU *cpu = s390_env_get_cpu(env);
  74
  75     qemu_log_mask(CPU_LOG_INT, "program interrupt at %#" PRIx64 "\n",
  76                   env->psw.addr);
  77
  78     if (kvm_enabled()) {
  79 #ifdef CONFIG_KVM
  80         struct kvm_s390_irq irq = {
  81             .type = KVM_S390_PROGRAM_INT,
  82             .u.pgm.code = code,
  83         };
  84
  85         kvm_s390_vcpu_interrupt(cpu, &irq);
  86 #endif
  87     } else {
  88         CPUState *cs = CPU(cpu);
  89
  90         env->int_pgm_code = code;
  91         env->int_pgm_ilen = ilen;
  92         cs->exception_index = EXCP_PGM;
  93         cpu_loop_exit(cs);
  94     }
  95 }
  96
  97 #ifndef CONFIG_USER_ONLY
  98
  99 /* SCLP service call */
 100 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
 101 {
 102     qemu_mutex_lock_iothread();
 103     int r = sclp_service_call(env, r1, r2);
 104     if (r < 0) {
 105         program_interrupt(env, -r, 4);
 106         r = 0;
 107     }
 108     qemu_mutex_unlock_iothread();
 109     return r;
 110 }
 111
 112 void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
 113 {
 114     uint64_t r;
 115
 116     switch (num) {
 117     case 0x500:
 118         /* KVM hypercall */
 119         qemu_mutex_lock_iothread();
 120         r = s390_virtio_hypercall(env);
 121         qemu_mutex_unlock_iothread();
 122         break;
 123     case 0x44:
 124         /* yield */
 125         r = 0;
 126         break;
 127     case 0x308:
 128         /* ipl */
 129         handle_diag_308(env, r1, r3);
 130         r = 0;
 131         break;
 132     default:
 133         r = -1;
 134         break;
 135     }
 136
 137     if (r) {
 138         program_interrupt(env, PGM_OPERATION, ILEN_AUTO);
 139     }
 140 }
 141
 142 /* Set Prefix */
 143 void HELPER(spx)(CPUS390XState *env, uint64_t a1)
 144 {
 145     CPUState *cs = CPU(s390_env_get_cpu(env));
 146     uint32_t prefix = a1 & 0x7fffe000;
 147
 148     env->psa = prefix;
 149     HELPER_LOG("prefix: %#x\n", prefix);
 150     tlb_flush_page(cs, 0);
 151     tlb_flush_page(cs, TARGET_PAGE_SIZE);
 152 }
 153
 154 /* Store Clock */
 155 uint64_t HELPER(stck)(CPUS390XState *env)
 156 {
 157     uint64_t time;
 158
 159     time = env->tod_offset +
 160         time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - env->tod_basetime);
 161
 162     return time;
 163 }
 164
 165 /* Set Clock Comparator */
 166 void HELPER(sckc)(CPUS390XState *env, uint64_t time)
 167 {
 168     if (time == -1ULL) {
 169         return;
 170     }
 171
 172     env->ckc = time;
 173
 174     /* difference between origins */
 175     time -= env->tod_offset;
 176
 177     /* nanoseconds */
 178     time = tod2time(time);
 179
 180     timer_mod(env->tod_timer, env->tod_basetime + time);
 181 }
 182
 183 /* Store Clock Comparator */
 184 uint64_t HELPER(stckc)(CPUS390XState *env)
 185 {
 186     return env->ckc;
 187 }
 188
 189 /* Set CPU Timer */
 190 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 191 {
 192     if (time == -1ULL) {
 193         return;
 194     }
 195
 196     /* nanoseconds */
 197     time = tod2time(time);
 198
 199     env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
 200
 201     timer_mod(env->cpu_timer, env->cputm);
 202 }
 203
 204 /* Store CPU Timer */
 205 uint64_t HELPER(stpt)(CPUS390XState *env)
 206 {
 207     return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 208 }
 209
 210 /* Store System Information */
 211 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 212                       uint64_t r0, uint64_t r1)
 213 {
 214     S390CPU *cpu = s390_env_get_cpu(env);
 215     int cc = 0;
 216     int sel1, sel2;
 217
 218     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 219         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 220         /* valid function code, invalid reserved bits */
 221         program_interrupt(env, PGM_SPECIFICATION, 2);
 222     }
 223
 224     sel1 = r0 & STSI_R0_SEL1_MASK;
 225     sel2 = r1 & STSI_R1_SEL2_MASK;
 226
 227     /* XXX: spec exception if sysib is not 4k-aligned */
 228
 229     switch (r0 & STSI_LEVEL_MASK) {
 230     case STSI_LEVEL_1:
 231         if ((sel1 == 1) && (sel2 == 1)) {
 232             /* Basic Machine Configuration */
 233             struct sysib_111 sysib;
 234             char type[5] = {};
 235
 236             memset(&sysib, 0, sizeof(sysib));
 237             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 238             /* same as machine type number in STORE CPU ID, but in EBCDIC */
 239             snprintf(type, ARRAY_SIZE(type), "%X", cpu->model->def->type);
 240             ebcdic_put(sysib.type, type, 4);
 241             /* model number (not stored in STORE CPU ID for z/Architecure) */
 242             ebcdic_put(sysib.model, "QEMU            ", 16);
 243             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 244             ebcdic_put(sysib.plant, "QEMU", 4);
 245             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 246         } else if ((sel1 == 2) && (sel2 == 1)) {
 247             /* Basic Machine CPU */
 248             struct sysib_121 sysib;
 249
 250             memset(&sysib, 0, sizeof(sysib));
 251             /* XXX make different for different CPUs? */
 252             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 253             ebcdic_put(sysib.plant, "QEMU", 4);
 254             stw_p(&sysib.cpu_addr, env->cpu_num);
 255             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 256         } else if ((sel1 == 2) && (sel2 == 2)) {
 257             /* Basic Machine CPUs */
 258             struct sysib_122 sysib;
 259
 260             memset(&sysib, 0, sizeof(sysib));
 261             stl_p(&sysib.capability, 0x443afc29);
 262             /* XXX change when SMP comes */
 263             stw_p(&sysib.total_cpus, 1);
 264             stw_p(&sysib.active_cpus, 1);
 265             stw_p(&sysib.standby_cpus, 0);
 266             stw_p(&sysib.reserved_cpus, 0);
 267             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 268         } else {
 269             cc = 3;
 270         }
 271         break;
 272     case STSI_LEVEL_2:
 273         {
 274             if ((sel1 == 2) && (sel2 == 1)) {
 275                 /* LPAR CPU */
 276                 struct sysib_221 sysib;
 277
 278                 memset(&sysib, 0, sizeof(sysib));
 279                 /* XXX make different for different CPUs? */
 280                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 281                 ebcdic_put(sysib.plant, "QEMU", 4);
 282                 stw_p(&sysib.cpu_addr, env->cpu_num);
 283                 stw_p(&sysib.cpu_id, 0);
 284                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 285             } else if ((sel1 == 2) && (sel2 == 2)) {
 286                 /* LPAR CPUs */
 287                 struct sysib_222 sysib;
 288
 289                 memset(&sysib, 0, sizeof(sysib));
 290                 stw_p(&sysib.lpar_num, 0);
 291                 sysib.lcpuc = 0;
 292                 /* XXX change when SMP comes */
 293                 stw_p(&sysib.total_cpus, 1);
 294                 stw_p(&sysib.conf_cpus, 1);
 295                 stw_p(&sysib.standby_cpus, 0);
 296                 stw_p(&sysib.reserved_cpus, 0);
 297                 ebcdic_put(sysib.name, "QEMU    ", 8);
 298                 stl_p(&sysib.caf, 1000);
 299                 stw_p(&sysib.dedicated_cpus, 0);
 300                 stw_p(&sysib.shared_cpus, 0);
 301                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 302             } else {
 303                 cc = 3;
 304             }
 305             break;
 306         }
 307     case STSI_LEVEL_3:
 308         {
 309             if ((sel1 == 2) && (sel2 == 2)) {
 310                 /* VM CPUs */
 311                 struct sysib_322 sysib;
 312
 313                 memset(&sysib, 0, sizeof(sysib));
 314                 sysib.count = 1;
 315                 /* XXX change when SMP comes */
 316                 stw_p(&sysib.vm[0].total_cpus, 1);
 317                 stw_p(&sysib.vm[0].conf_cpus, 1);
 318                 stw_p(&sysib.vm[0].standby_cpus, 0);
 319                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 320                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 321                 stl_p(&sysib.vm[0].caf, 1000);
 322                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 323                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 324             } else {
 325                 cc = 3;
 326             }
 327             break;
 328         }
 329     case STSI_LEVEL_CURRENT:
 330         env->regs[0] = STSI_LEVEL_3;
 331         break;
 332     default:
 333         cc = 3;
 334         break;
 335     }
 336
 337     return cc;
 338 }
 339
 340 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 341                       uint64_t cpu_addr)
 342 {
 343     int cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 344
 345     HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",
 346                __func__, order_code, r1, cpu_addr);
 347
 348     /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"
 349        as parameter (input). Status (output) is always R1. */
 350
 351     switch (order_code & SIGP_ORDER_MASK) {
 352     case SIGP_SET_ARCH:
 353         /* switch arch */
 354         break;
 355     case SIGP_SENSE:
 356         /* enumerate CPU status */
 357         if (cpu_addr) {
 358             /* XXX implement when SMP comes */
 359             return 3;
 360         }
 361         env->regs[r1] &= 0xffffffff00000000ULL;
 362         cc = 1;
 363         break;
 364 #if !defined(CONFIG_USER_ONLY)
 365     case SIGP_RESTART:
 366         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
 367         cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 368         break;
 369     case SIGP_STOP:
 370         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 371         cpu_loop_exit(CPU(s390_env_get_cpu(env)));
 372         break;
 373 #endif
 374     default:
 375         /* unknown sigp */
 376         fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);
 377         cc = SIGP_CC_NOT_OPERATIONAL;
 378     }
 379
 380     return cc;
 381 }
 382 #endif
 383
 384 #ifndef CONFIG_USER_ONLY
 385 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 386 {
 387     S390CPU *cpu = s390_env_get_cpu(env);
 388     qemu_mutex_lock_iothread();
 389     ioinst_handle_xsch(cpu, r1);
 390     qemu_mutex_unlock_iothread();
 391 }
 392
 393 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 394 {
 395     S390CPU *cpu = s390_env_get_cpu(env);
 396     qemu_mutex_lock_iothread();
 397     ioinst_handle_csch(cpu, r1);
 398     qemu_mutex_unlock_iothread();
 399 }
 400
 401 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 402 {
 403     S390CPU *cpu = s390_env_get_cpu(env);
 404     qemu_mutex_lock_iothread();
 405     ioinst_handle_hsch(cpu, r1);
 406     qemu_mutex_unlock_iothread();
 407 }
 408
 409 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 410 {
 411     S390CPU *cpu = s390_env_get_cpu(env);
 412     qemu_mutex_lock_iothread();
 413     ioinst_handle_msch(cpu, r1, inst >> 16);
 414     qemu_mutex_unlock_iothread();
 415 }
 416
 417 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 418 {
 419     S390CPU *cpu = s390_env_get_cpu(env);
 420     qemu_mutex_lock_iothread();
 421     ioinst_handle_rchp(cpu, r1);
 422     qemu_mutex_unlock_iothread();
 423 }
 424
 425 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 426 {
 427     S390CPU *cpu = s390_env_get_cpu(env);
 428     qemu_mutex_lock_iothread();
 429     ioinst_handle_rsch(cpu, r1);
 430     qemu_mutex_unlock_iothread();
 431 }
 432
 433 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 434 {
 435     S390CPU *cpu = s390_env_get_cpu(env);
 436     qemu_mutex_lock_iothread();
 437     ioinst_handle_ssch(cpu, r1, inst >> 16);
 438     qemu_mutex_unlock_iothread();
 439 }
 440
 441 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 442 {
 443     S390CPU *cpu = s390_env_get_cpu(env);
 444     qemu_mutex_lock_iothread();
 445     ioinst_handle_stsch(cpu, r1, inst >> 16);
 446     qemu_mutex_unlock_iothread();
 447 }
 448
 449 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 450 {
 451     S390CPU *cpu = s390_env_get_cpu(env);
 452     qemu_mutex_lock_iothread();
 453     ioinst_handle_tsch(cpu, r1, inst >> 16);
 454     qemu_mutex_unlock_iothread();
 455 }
 456
 457 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 458 {
 459     S390CPU *cpu = s390_env_get_cpu(env);
 460     qemu_mutex_lock_iothread();
 461     ioinst_handle_chsc(cpu, inst >> 16);
 462     qemu_mutex_unlock_iothread();
 463 }
 464 #endif
 465
 466 #ifndef CONFIG_USER_ONLY
 467 void HELPER(per_check_exception)(CPUS390XState *env)
 468 {
 469     CPUState *cs = CPU(s390_env_get_cpu(env));
 470
 471     if (env->per_perc_atmid) {
 472         env->int_pgm_code = PGM_PER;
 473         env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, env->per_address));
 474
 475         cs->exception_index = EXCP_PGM;
 476         cpu_loop_exit(cs);
 477     }
 478 }
 479
 480 void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
 481 {
 482     if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
 483         if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
 484             || get_per_in_range(env, to)) {
 485             env->per_address = from;
 486             env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
 487         }
 488     }
 489 }
 490
 491 void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
 492 {
 493     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
 494         env->per_address = addr;
 495         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
 496
 497         /* If the instruction has to be nullified, trigger the
 498            exception immediately. */
 499         if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
 500             CPUState *cs = CPU(s390_env_get_cpu(env));
 501
 502             env->per_perc_atmid |= PER_CODE_EVENT_NULLIFICATION;
 503             env->int_pgm_code = PGM_PER;
 504             env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
 505
 506             cs->exception_index = EXCP_PGM;
 507             cpu_loop_exit(cs);
 508         }
 509     }
 510 }
 511 #endif
 512
 513 /* The maximum bit defined at the moment is 129.  */
 514 #define MAX_STFL_WORDS  3
 515
 516 /* Canonicalize the current cpu's features into the 64-bit words required
 517    by STFLE.  Return the index-1 of the max word that is non-zero.  */
 518 static unsigned do_stfle(CPUS390XState *env, uint64_t words[MAX_STFL_WORDS])
 519 {
 520     S390CPU *cpu = s390_env_get_cpu(env);
 521     const unsigned long *features = cpu->model->features;
 522     unsigned max_bit = 0;
 523     S390Feat feat;
 524
 525     memset(words, 0, sizeof(uint64_t) * MAX_STFL_WORDS);
 526
 527     if (test_bit(S390_FEAT_ZARCH, features)) {
 528         /* z/Architecture is always active if around */
 529         words[0] = 1ull << (63 - 2);
 530     }
 531
 532     for (feat = find_first_bit(features, S390_FEAT_MAX);
 533          feat < S390_FEAT_MAX;
 534          feat = find_next_bit(features, S390_FEAT_MAX, feat + 1)) {
 535         const S390FeatDef *def = s390_feat_def(feat);
 536         if (def->type == S390_FEAT_TYPE_STFL) {
 537             unsigned bit = def->bit;
 538             if (bit > max_bit) {
 539                 max_bit = bit;
 540             }
 541             assert(bit / 64 < MAX_STFL_WORDS);
 542             words[bit / 64] |= 1ULL << (63 - bit % 64);
 543         }
 544     }
 545
 546     return max_bit / 64;
 547 }
 548
 549 void HELPER(stfl)(CPUS390XState *env)
 550 {
 551     uint64_t words[MAX_STFL_WORDS];
 552
 553     do_stfle(env, words);
 554     cpu_stl_data(env, 200, words[0] >> 32);
 555 }
 556
 557 uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
 558 {
 559     uint64_t words[MAX_STFL_WORDS];
 560     unsigned count_m1 = env->regs[0] & 0xff;
 561     unsigned max_m1 = do_stfle(env, words);
 562     unsigned i;
 563
 564     for (i = 0; i <= count_m1; ++i) {
 565         cpu_stq_data(env, addr + 8 * i, words[i]);
 566     }
 567
 568     env->regs[0] = deposit64(env->regs[0], 0, 8, max_m1);
 569     return (count_m1 >= max_m1 ? 0 : 3);
 570 }