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