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                       uint32_t r3)
 323 {
 324     int cc;
 325
 326     /* TODO: needed to inject interrupts  - push further down */
 327     qemu_mutex_lock_iothread();
 328     cc = handle_sigp(env, order_code & SIGP_ORDER_MASK, r1, r3);
 329     qemu_mutex_unlock_iothread();
 330
 331     return cc;
 332 }
 333 #endif
 334
 335 #ifndef CONFIG_USER_ONLY
 336 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 337 {
 338     S390CPU *cpu = s390_env_get_cpu(env);
 339     qemu_mutex_lock_iothread();
 340     ioinst_handle_xsch(cpu, r1);
 341     qemu_mutex_unlock_iothread();
 342 }
 343
 344 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 345 {
 346     S390CPU *cpu = s390_env_get_cpu(env);
 347     qemu_mutex_lock_iothread();
 348     ioinst_handle_csch(cpu, r1);
 349     qemu_mutex_unlock_iothread();
 350 }
 351
 352 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 353 {
 354     S390CPU *cpu = s390_env_get_cpu(env);
 355     qemu_mutex_lock_iothread();
 356     ioinst_handle_hsch(cpu, r1);
 357     qemu_mutex_unlock_iothread();
 358 }
 359
 360 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 361 {
 362     S390CPU *cpu = s390_env_get_cpu(env);
 363     qemu_mutex_lock_iothread();
 364     ioinst_handle_msch(cpu, r1, inst >> 16);
 365     qemu_mutex_unlock_iothread();
 366 }
 367
 368 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 369 {
 370     S390CPU *cpu = s390_env_get_cpu(env);
 371     qemu_mutex_lock_iothread();
 372     ioinst_handle_rchp(cpu, r1);
 373     qemu_mutex_unlock_iothread();
 374 }
 375
 376 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 377 {
 378     S390CPU *cpu = s390_env_get_cpu(env);
 379     qemu_mutex_lock_iothread();
 380     ioinst_handle_rsch(cpu, r1);
 381     qemu_mutex_unlock_iothread();
 382 }
 383
 384 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 385 {
 386     S390CPU *cpu = s390_env_get_cpu(env);
 387     qemu_mutex_lock_iothread();
 388     ioinst_handle_ssch(cpu, r1, inst >> 16);
 389     qemu_mutex_unlock_iothread();
 390 }
 391
 392 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 393 {
 394     S390CPU *cpu = s390_env_get_cpu(env);
 395     qemu_mutex_lock_iothread();
 396     ioinst_handle_stsch(cpu, r1, inst >> 16);
 397     qemu_mutex_unlock_iothread();
 398 }
 399
 400 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 401 {
 402     S390CPU *cpu = s390_env_get_cpu(env);
 403     qemu_mutex_lock_iothread();
 404     ioinst_handle_tsch(cpu, r1, inst >> 16);
 405     qemu_mutex_unlock_iothread();
 406 }
 407
 408 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 409 {
 410     S390CPU *cpu = s390_env_get_cpu(env);
 411     qemu_mutex_lock_iothread();
 412     ioinst_handle_chsc(cpu, inst >> 16);
 413     qemu_mutex_unlock_iothread();
 414 }
 415 #endif
 416
 417 #ifndef CONFIG_USER_ONLY
 418 void HELPER(per_check_exception)(CPUS390XState *env)
 419 {
 420     uint32_t ilen;
 421
 422     if (env->per_perc_atmid) {
 423         /*
 424          * FIXME: ILEN_AUTO is most probably the right thing to use. ilen
 425          * always has to match the instruction referenced in the PSW. E.g.
 426          * if a PER interrupt is triggered via EXECUTE, we have to use ilen
 427          * of EXECUTE, while per_address contains the target of EXECUTE.
 428          */
 429         ilen = get_ilen(cpu_ldub_code(env, env->per_address));
 430         program_interrupt(env, PGM_PER, ilen);
 431     }
 432 }
 433
 434 /* Check if an address is within the PER starting address and the PER
 435    ending address.  The address range might loop.  */
 436 static inline bool get_per_in_range(CPUS390XState *env, uint64_t addr)
 437 {
 438     if (env->cregs[10] <= env->cregs[11]) {
 439         return env->cregs[10] <= addr && addr <= env->cregs[11];
 440     } else {
 441         return env->cregs[10] <= addr || addr <= env->cregs[11];
 442     }
 443 }
 444
 445 void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
 446 {
 447     if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
 448         if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
 449             || get_per_in_range(env, to)) {
 450             env->per_address = from;
 451             env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
 452         }
 453     }
 454 }
 455
 456 void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
 457 {
 458     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
 459         env->per_address = addr;
 460         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
 461
 462         /* If the instruction has to be nullified, trigger the
 463            exception immediately. */
 464         if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
 465             CPUState *cs = CPU(s390_env_get_cpu(env));
 466
 467             env->per_perc_atmid |= PER_CODE_EVENT_NULLIFICATION;
 468             env->int_pgm_code = PGM_PER;
 469             env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
 470
 471             cs->exception_index = EXCP_PGM;
 472             cpu_loop_exit(cs);
 473         }
 474     }
 475 }
 476 #endif
 477
 478 static uint8_t stfl_bytes[2048];
 479 static unsigned int used_stfl_bytes;
 480
 481 static void prepare_stfl(void)
 482 {
 483     static bool initialized;
 484     int i;
 485
 486     /* racy, but we don't care, the same values are always written */
 487     if (initialized) {
 488         return;
 489     }
 490
 491     s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
 492     for (i = 0; i < sizeof(stfl_bytes); i++) {
 493         if (stfl_bytes[i]) {
 494             used_stfl_bytes = i + 1;
 495         }
 496     }
 497     initialized = true;
 498 }
 499
 500 #ifndef CONFIG_USER_ONLY
 501 void HELPER(stfl)(CPUS390XState *env)
 502 {
 503     LowCore *lowcore;
 504
 505     lowcore = cpu_map_lowcore(env);
 506     prepare_stfl();
 507     memcpy(&lowcore->stfl_fac_list, stfl_bytes, sizeof(lowcore->stfl_fac_list));
 508     cpu_unmap_lowcore(lowcore);
 509 }
 510 #endif
 511
 512 uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
 513 {
 514     const uintptr_t ra = GETPC();
 515     const int count_bytes = ((env->regs[0] & 0xff) + 1) * 8;
 516     const int max_bytes = ROUND_UP(used_stfl_bytes, 8);
 517     int i;
 518
 519     if (addr & 0x7) {
 520         cpu_restore_state(ENV_GET_CPU(env), ra);
 521         program_interrupt(env, PGM_SPECIFICATION, 4);
 522     }
 523
 524     prepare_stfl();
 525     for (i = 0; i < count_bytes; ++i) {
 526         cpu_stb_data_ra(env, addr + i, stfl_bytes[i], ra);
 527     }
 528
 529     env->regs[0] = deposit64(env->regs[0], 0, 8, (max_bytes / 8) - 1);
 530     return count_bytes >= max_bytes ? 0 : 3;
 531 }