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 #ifndef CONFIG_USER_ONLY
  59
  60 /* SCLP service call */
  61 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
  62 {
  63     qemu_mutex_lock_iothread();
  64     int r = sclp_service_call(env, r1, r2);
  65     if (r < 0) {
  66         program_interrupt(env, -r, 4);
  67         r = 0;
  68     }
  69     qemu_mutex_unlock_iothread();
  70     return r;
  71 }
  72
  73 void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
  74 {
  75     uint64_t r;
  76
  77     switch (num) {
  78     case 0x500:
  79         /* KVM hypercall */
  80         qemu_mutex_lock_iothread();
  81         r = s390_virtio_hypercall(env);
  82         qemu_mutex_unlock_iothread();
  83         break;
  84     case 0x44:
  85         /* yield */
  86         r = 0;
  87         break;
  88     case 0x308:
  89         /* ipl */
  90         qemu_mutex_lock_iothread();
  91         handle_diag_308(env, r1, r3);
  92         qemu_mutex_unlock_iothread();
  93         r = 0;
  94         break;
  95     case 0x288:
  96         /* time bomb (watchdog) */
  97         r = handle_diag_288(env, r1, r3);
  98         break;
  99     default:
 100         r = -1;
 101         break;
 102     }
 103
 104     if (r) {
 105         program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO);
 106     }
 107 }
 108
 109 /* Set Prefix */
 110 void HELPER(spx)(CPUS390XState *env, uint64_t a1)
 111 {
 112     CPUState *cs = CPU(s390_env_get_cpu(env));
 113     uint32_t prefix = a1 & 0x7fffe000;
 114
 115     env->psa = prefix;
 116     HELPER_LOG("prefix: %#x\n", prefix);
 117     tlb_flush_page(cs, 0);
 118     tlb_flush_page(cs, TARGET_PAGE_SIZE);
 119 }
 120
 121 /* Store Clock */
 122 uint64_t HELPER(stck)(CPUS390XState *env)
 123 {
 124     uint64_t time;
 125
 126     time = env->tod_offset +
 127         time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - env->tod_basetime);
 128
 129     return time;
 130 }
 131
 132 /* Set Clock Comparator */
 133 void HELPER(sckc)(CPUS390XState *env, uint64_t time)
 134 {
 135     if (time == -1ULL) {
 136         return;
 137     }
 138
 139     env->ckc = time;
 140
 141     /* difference between origins */
 142     time -= env->tod_offset;
 143
 144     /* nanoseconds */
 145     time = tod2time(time);
 146
 147     timer_mod(env->tod_timer, env->tod_basetime + time);
 148 }
 149
 150 /* Store Clock Comparator */
 151 uint64_t HELPER(stckc)(CPUS390XState *env)
 152 {
 153     return env->ckc;
 154 }
 155
 156 /* Set CPU Timer */
 157 void HELPER(spt)(CPUS390XState *env, uint64_t time)
 158 {
 159     if (time == -1ULL) {
 160         return;
 161     }
 162
 163     /* nanoseconds */
 164     time = tod2time(time);
 165
 166     env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
 167
 168     timer_mod(env->cpu_timer, env->cputm);
 169 }
 170
 171 /* Store CPU Timer */
 172 uint64_t HELPER(stpt)(CPUS390XState *env)
 173 {
 174     return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 175 }
 176
 177 /* Store System Information */
 178 uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0,
 179                       uint64_t r0, uint64_t r1)
 180 {
 181     S390CPU *cpu = s390_env_get_cpu(env);
 182     int cc = 0;
 183     int sel1, sel2;
 184
 185     if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&
 186         ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {
 187         /* valid function code, invalid reserved bits */
 188         program_interrupt(env, PGM_SPECIFICATION, 4);
 189     }
 190
 191     sel1 = r0 & STSI_R0_SEL1_MASK;
 192     sel2 = r1 & STSI_R1_SEL2_MASK;
 193
 194     /* XXX: spec exception if sysib is not 4k-aligned */
 195
 196     switch (r0 & STSI_LEVEL_MASK) {
 197     case STSI_LEVEL_1:
 198         if ((sel1 == 1) && (sel2 == 1)) {
 199             /* Basic Machine Configuration */
 200             struct sysib_111 sysib;
 201             char type[5] = {};
 202
 203             memset(&sysib, 0, sizeof(sysib));
 204             ebcdic_put(sysib.manuf, "QEMU            ", 16);
 205             /* same as machine type number in STORE CPU ID, but in EBCDIC */
 206             snprintf(type, ARRAY_SIZE(type), "%X", cpu->model->def->type);
 207             ebcdic_put(sysib.type, type, 4);
 208             /* model number (not stored in STORE CPU ID for z/Architecure) */
 209             ebcdic_put(sysib.model, "QEMU            ", 16);
 210             ebcdic_put(sysib.sequence, "QEMU            ", 16);
 211             ebcdic_put(sysib.plant, "QEMU", 4);
 212             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 213         } else if ((sel1 == 2) && (sel2 == 1)) {
 214             /* Basic Machine CPU */
 215             struct sysib_121 sysib;
 216
 217             memset(&sysib, 0, sizeof(sysib));
 218             /* XXX make different for different CPUs? */
 219             ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 220             ebcdic_put(sysib.plant, "QEMU", 4);
 221             stw_p(&sysib.cpu_addr, env->core_id);
 222             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 223         } else if ((sel1 == 2) && (sel2 == 2)) {
 224             /* Basic Machine CPUs */
 225             struct sysib_122 sysib;
 226
 227             memset(&sysib, 0, sizeof(sysib));
 228             stl_p(&sysib.capability, 0x443afc29);
 229             /* XXX change when SMP comes */
 230             stw_p(&sysib.total_cpus, 1);
 231             stw_p(&sysib.active_cpus, 1);
 232             stw_p(&sysib.standby_cpus, 0);
 233             stw_p(&sysib.reserved_cpus, 0);
 234             cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 235         } else {
 236             cc = 3;
 237         }
 238         break;
 239     case STSI_LEVEL_2:
 240         {
 241             if ((sel1 == 2) && (sel2 == 1)) {
 242                 /* LPAR CPU */
 243                 struct sysib_221 sysib;
 244
 245                 memset(&sysib, 0, sizeof(sysib));
 246                 /* XXX make different for different CPUs? */
 247                 ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);
 248                 ebcdic_put(sysib.plant, "QEMU", 4);
 249                 stw_p(&sysib.cpu_addr, env->core_id);
 250                 stw_p(&sysib.cpu_id, 0);
 251                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 252             } else if ((sel1 == 2) && (sel2 == 2)) {
 253                 /* LPAR CPUs */
 254                 struct sysib_222 sysib;
 255
 256                 memset(&sysib, 0, sizeof(sysib));
 257                 stw_p(&sysib.lpar_num, 0);
 258                 sysib.lcpuc = 0;
 259                 /* XXX change when SMP comes */
 260                 stw_p(&sysib.total_cpus, 1);
 261                 stw_p(&sysib.conf_cpus, 1);
 262                 stw_p(&sysib.standby_cpus, 0);
 263                 stw_p(&sysib.reserved_cpus, 0);
 264                 ebcdic_put(sysib.name, "QEMU    ", 8);
 265                 stl_p(&sysib.caf, 1000);
 266                 stw_p(&sysib.dedicated_cpus, 0);
 267                 stw_p(&sysib.shared_cpus, 0);
 268                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 269             } else {
 270                 cc = 3;
 271             }
 272             break;
 273         }
 274     case STSI_LEVEL_3:
 275         {
 276             if ((sel1 == 2) && (sel2 == 2)) {
 277                 /* VM CPUs */
 278                 struct sysib_322 sysib;
 279
 280                 memset(&sysib, 0, sizeof(sysib));
 281                 sysib.count = 1;
 282                 /* XXX change when SMP comes */
 283                 stw_p(&sysib.vm[0].total_cpus, 1);
 284                 stw_p(&sysib.vm[0].conf_cpus, 1);
 285                 stw_p(&sysib.vm[0].standby_cpus, 0);
 286                 stw_p(&sysib.vm[0].reserved_cpus, 0);
 287                 ebcdic_put(sysib.vm[0].name, "KVMguest", 8);
 288                 stl_p(&sysib.vm[0].caf, 1000);
 289                 ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);
 290                 cpu_physical_memory_write(a0, &sysib, sizeof(sysib));
 291             } else {
 292                 cc = 3;
 293             }
 294             break;
 295         }
 296     case STSI_LEVEL_CURRENT:
 297         env->regs[0] = STSI_LEVEL_3;
 298         break;
 299     default:
 300         cc = 3;
 301         break;
 302     }
 303
 304     return cc;
 305 }
 306
 307 uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
 308                       uint32_t r3)
 309 {
 310     int cc;
 311
 312     /* TODO: needed to inject interrupts  - push further down */
 313     qemu_mutex_lock_iothread();
 314     cc = handle_sigp(env, order_code & SIGP_ORDER_MASK, r1, r3);
 315     qemu_mutex_unlock_iothread();
 316
 317     return cc;
 318 }
 319 #endif
 320
 321 #ifndef CONFIG_USER_ONLY
 322 void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
 323 {
 324     S390CPU *cpu = s390_env_get_cpu(env);
 325     qemu_mutex_lock_iothread();
 326     ioinst_handle_xsch(cpu, r1, GETPC());
 327     qemu_mutex_unlock_iothread();
 328 }
 329
 330 void HELPER(csch)(CPUS390XState *env, uint64_t r1)
 331 {
 332     S390CPU *cpu = s390_env_get_cpu(env);
 333     qemu_mutex_lock_iothread();
 334     ioinst_handle_csch(cpu, r1, GETPC());
 335     qemu_mutex_unlock_iothread();
 336 }
 337
 338 void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
 339 {
 340     S390CPU *cpu = s390_env_get_cpu(env);
 341     qemu_mutex_lock_iothread();
 342     ioinst_handle_hsch(cpu, r1, GETPC());
 343     qemu_mutex_unlock_iothread();
 344 }
 345
 346 void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 347 {
 348     S390CPU *cpu = s390_env_get_cpu(env);
 349     qemu_mutex_lock_iothread();
 350     ioinst_handle_msch(cpu, r1, inst >> 16, GETPC());
 351     qemu_mutex_unlock_iothread();
 352 }
 353
 354 void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
 355 {
 356     S390CPU *cpu = s390_env_get_cpu(env);
 357     qemu_mutex_lock_iothread();
 358     ioinst_handle_rchp(cpu, r1, GETPC());
 359     qemu_mutex_unlock_iothread();
 360 }
 361
 362 void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
 363 {
 364     S390CPU *cpu = s390_env_get_cpu(env);
 365     qemu_mutex_lock_iothread();
 366     ioinst_handle_rsch(cpu, r1, GETPC());
 367     qemu_mutex_unlock_iothread();
 368 }
 369
 370 void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 371 {
 372     S390CPU *cpu = s390_env_get_cpu(env);
 373     qemu_mutex_lock_iothread();
 374     ioinst_handle_ssch(cpu, r1, inst >> 16, GETPC());
 375     qemu_mutex_unlock_iothread();
 376 }
 377
 378 void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 379 {
 380     S390CPU *cpu = s390_env_get_cpu(env);
 381     qemu_mutex_lock_iothread();
 382     ioinst_handle_stsch(cpu, r1, inst >> 16, GETPC());
 383     qemu_mutex_unlock_iothread();
 384 }
 385
 386 void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
 387 {
 388     S390CPU *cpu = s390_env_get_cpu(env);
 389     qemu_mutex_lock_iothread();
 390     ioinst_handle_tsch(cpu, r1, inst >> 16, GETPC());
 391     qemu_mutex_unlock_iothread();
 392 }
 393
 394 void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
 395 {
 396     S390CPU *cpu = s390_env_get_cpu(env);
 397     qemu_mutex_lock_iothread();
 398     ioinst_handle_chsc(cpu, inst >> 16, GETPC());
 399     qemu_mutex_unlock_iothread();
 400 }
 401 #endif
 402
 403 #ifndef CONFIG_USER_ONLY
 404 void HELPER(per_check_exception)(CPUS390XState *env)
 405 {
 406     uint32_t ilen;
 407
 408     if (env->per_perc_atmid) {
 409         /*
 410          * FIXME: ILEN_AUTO is most probably the right thing to use. ilen
 411          * always has to match the instruction referenced in the PSW. E.g.
 412          * if a PER interrupt is triggered via EXECUTE, we have to use ilen
 413          * of EXECUTE, while per_address contains the target of EXECUTE.
 414          */
 415         ilen = get_ilen(cpu_ldub_code(env, env->per_address));
 416         program_interrupt(env, PGM_PER, ilen);
 417     }
 418 }
 419
 420 /* Check if an address is within the PER starting address and the PER
 421    ending address.  The address range might loop.  */
 422 static inline bool get_per_in_range(CPUS390XState *env, uint64_t addr)
 423 {
 424     if (env->cregs[10] <= env->cregs[11]) {
 425         return env->cregs[10] <= addr && addr <= env->cregs[11];
 426     } else {
 427         return env->cregs[10] <= addr || addr <= env->cregs[11];
 428     }
 429 }
 430
 431 void HELPER(per_branch)(CPUS390XState *env, uint64_t from, uint64_t to)
 432 {
 433     if ((env->cregs[9] & PER_CR9_EVENT_BRANCH)) {
 434         if (!(env->cregs[9] & PER_CR9_CONTROL_BRANCH_ADDRESS)
 435             || get_per_in_range(env, to)) {
 436             env->per_address = from;
 437             env->per_perc_atmid = PER_CODE_EVENT_BRANCH | get_per_atmid(env);
 438         }
 439     }
 440 }
 441
 442 void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
 443 {
 444     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
 445         env->per_address = addr;
 446         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
 447
 448         /* If the instruction has to be nullified, trigger the
 449            exception immediately. */
 450         if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
 451             CPUState *cs = CPU(s390_env_get_cpu(env));
 452
 453             env->per_perc_atmid |= PER_CODE_EVENT_NULLIFICATION;
 454             env->int_pgm_code = PGM_PER;
 455             env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
 456
 457             cs->exception_index = EXCP_PGM;
 458             cpu_loop_exit(cs);
 459         }
 460     }
 461 }
 462 #endif
 463
 464 static uint8_t stfl_bytes[2048];
 465 static unsigned int used_stfl_bytes;
 466
 467 static void prepare_stfl(void)
 468 {
 469     static bool initialized;
 470     int i;
 471
 472     /* racy, but we don't care, the same values are always written */
 473     if (initialized) {
 474         return;
 475     }
 476
 477     s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
 478     for (i = 0; i < sizeof(stfl_bytes); i++) {
 479         if (stfl_bytes[i]) {
 480             used_stfl_bytes = i + 1;
 481         }
 482     }
 483     initialized = true;
 484 }
 485
 486 #ifndef CONFIG_USER_ONLY
 487 void HELPER(stfl)(CPUS390XState *env)
 488 {
 489     LowCore *lowcore;
 490
 491     lowcore = cpu_map_lowcore(env);
 492     prepare_stfl();
 493     memcpy(&lowcore->stfl_fac_list, stfl_bytes, sizeof(lowcore->stfl_fac_list));
 494     cpu_unmap_lowcore(lowcore);
 495 }
 496 #endif
 497
 498 uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
 499 {
 500     const uintptr_t ra = GETPC();
 501     const int count_bytes = ((env->regs[0] & 0xff) + 1) * 8;
 502     const int max_bytes = ROUND_UP(used_stfl_bytes, 8);
 503     int i;
 504
 505     if (addr & 0x7) {
 506         s390_program_interrupt(env, PGM_SPECIFICATION, 4, ra);
 507     }
 508
 509     prepare_stfl();
 510     for (i = 0; i < count_bytes; ++i) {
 511         cpu_stb_data_ra(env, addr + i, stfl_bytes[i], ra);
 512     }
 513
 514     env->regs[0] = deposit64(env->regs[0], 0, 8, (max_bytes / 8) - 1);
 515     return count_bytes >= max_bytes ? 0 : 3;
 516 }