target-s390x/helper.c

   1 /*
   2  *  S/390 helpers
   3  *
   4  *  Copyright (c) 2009 Ulrich Hecht
   5  *  Copyright (c) 2011 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 "cpu.h"
  22 #include "exec/gdbstub.h"
  23 #include "qemu-timer.h"
  24 #ifndef CONFIG_USER_ONLY
  25 #include "sysemu.h"
  26 #endif
  27
  28 //#define DEBUG_S390
  29 //#define DEBUG_S390_PTE
  30 //#define DEBUG_S390_STDOUT
  31
  32 #ifdef DEBUG_S390
  33 #ifdef DEBUG_S390_STDOUT
  34 #define DPRINTF(fmt, ...) \
  35     do { fprintf(stderr, fmt, ## __VA_ARGS__); \
  36          qemu_log(fmt, ##__VA_ARGS__); } while (0)
  37 #else
  38 #define DPRINTF(fmt, ...) \
  39     do { qemu_log(fmt, ## __VA_ARGS__); } while (0)
  40 #endif
  41 #else
  42 #define DPRINTF(fmt, ...) \
  43     do { } while (0)
  44 #endif
  45
  46 #ifdef DEBUG_S390_PTE
  47 #define PTE_DPRINTF DPRINTF
  48 #else
  49 #define PTE_DPRINTF(fmt, ...) \
  50     do { } while (0)
  51 #endif
  52
  53 #ifndef CONFIG_USER_ONLY
  54 void s390x_tod_timer(void *opaque)
  55 {
  56     S390CPU *cpu = opaque;
  57     CPUS390XState *env = &cpu->env;
  58
  59     env->pending_int |= INTERRUPT_TOD;
  60     cpu_interrupt(env, CPU_INTERRUPT_HARD);
  61 }
  62
  63 void s390x_cpu_timer(void *opaque)
  64 {
  65     S390CPU *cpu = opaque;
  66     CPUS390XState *env = &cpu->env;
  67
  68     env->pending_int |= INTERRUPT_CPUTIMER;
  69     cpu_interrupt(env, CPU_INTERRUPT_HARD);
  70 }
  71 #endif
  72
  73 S390CPU *cpu_s390x_init(const char *cpu_model)
  74 {
  75     S390CPU *cpu;
  76     CPUS390XState *env;
  77     static int inited;
  78
  79     cpu = S390_CPU(object_new(TYPE_S390_CPU));
  80     env = &cpu->env;
  81
  82     if (tcg_enabled() && !inited) {
  83         inited = 1;
  84         s390x_translate_init();
  85     }
  86
  87     env->cpu_model_str = cpu_model;
  88     qemu_init_vcpu(env);
  89     return cpu;
  90 }
  91
  92 #if defined(CONFIG_USER_ONLY)
  93
  94 void do_interrupt(CPUS390XState *env)
  95 {
  96     env->exception_index = -1;
  97 }
  98
  99 int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong address,
 100                                int rw, int mmu_idx)
 101 {
 102     /* fprintf(stderr, "%s: address 0x%lx rw %d mmu_idx %d\n",
 103        __func__, address, rw, mmu_idx); */
 104     env->exception_index = EXCP_ADDR;
 105     /* FIXME: find out how this works on a real machine */
 106     env->__excp_addr = address;
 107     return 1;
 108 }
 109
 110 #else /* !CONFIG_USER_ONLY */
 111
 112 /* Ensure to exit the TB after this call! */
 113 static void trigger_pgm_exception(CPUS390XState *env, uint32_t code,
 114                                   uint32_t ilc)
 115 {
 116     env->exception_index = EXCP_PGM;
 117     env->int_pgm_code = code;
 118     env->int_pgm_ilc = ilc;
 119 }
 120
 121 static int trans_bits(CPUS390XState *env, uint64_t mode)
 122 {
 123     int bits = 0;
 124
 125     switch (mode) {
 126     case PSW_ASC_PRIMARY:
 127         bits = 1;
 128         break;
 129     case PSW_ASC_SECONDARY:
 130         bits = 2;
 131         break;
 132     case PSW_ASC_HOME:
 133         bits = 3;
 134         break;
 135     default:
 136         cpu_abort(env, "unknown asc mode\n");
 137         break;
 138     }
 139
 140     return bits;
 141 }
 142
 143 static void trigger_prot_fault(CPUS390XState *env, target_ulong vaddr,
 144                                uint64_t mode)
 145 {
 146     int ilc = ILC_LATER_INC_2;
 147     int bits = trans_bits(env, mode) | 4;
 148
 149     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 150
 151     stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 152     trigger_pgm_exception(env, PGM_PROTECTION, ilc);
 153 }
 154
 155 static void trigger_page_fault(CPUS390XState *env, target_ulong vaddr,
 156                                uint32_t type, uint64_t asc, int rw)
 157 {
 158     int ilc = ILC_LATER;
 159     int bits = trans_bits(env, asc);
 160
 161     if (rw == 2) {
 162         /* code has is undefined ilc */
 163         ilc = 2;
 164     }
 165
 166     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __func__, vaddr, bits);
 167
 168     stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 169     trigger_pgm_exception(env, type, ilc);
 170 }
 171
 172 static int mmu_translate_asce(CPUS390XState *env, target_ulong vaddr,
 173                               uint64_t asc, uint64_t asce, int level,
 174                               target_ulong *raddr, int *flags, int rw)
 175 {
 176     uint64_t offs = 0;
 177     uint64_t origin;
 178     uint64_t new_asce;
 179
 180     PTE_DPRINTF("%s: 0x%" PRIx64 "\n", __func__, asce);
 181
 182     if (((level != _ASCE_TYPE_SEGMENT) && (asce & _REGION_ENTRY_INV)) ||
 183         ((level == _ASCE_TYPE_SEGMENT) && (asce & _SEGMENT_ENTRY_INV))) {
 184         /* XXX different regions have different faults */
 185         DPRINTF("%s: invalid region\n", __func__);
 186         trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
 187         return -1;
 188     }
 189
 190     if ((level <= _ASCE_TYPE_MASK) && ((asce & _ASCE_TYPE_MASK) != level)) {
 191         trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 192         return -1;
 193     }
 194
 195     if (asce & _ASCE_REAL_SPACE) {
 196         /* direct mapping */
 197
 198         *raddr = vaddr;
 199         return 0;
 200     }
 201
 202     origin = asce & _ASCE_ORIGIN;
 203
 204     switch (level) {
 205     case _ASCE_TYPE_REGION1 + 4:
 206         offs = (vaddr >> 50) & 0x3ff8;
 207         break;
 208     case _ASCE_TYPE_REGION1:
 209         offs = (vaddr >> 39) & 0x3ff8;
 210         break;
 211     case _ASCE_TYPE_REGION2:
 212         offs = (vaddr >> 28) & 0x3ff8;
 213         break;
 214     case _ASCE_TYPE_REGION3:
 215         offs = (vaddr >> 17) & 0x3ff8;
 216         break;
 217     case _ASCE_TYPE_SEGMENT:
 218         offs = (vaddr >> 9) & 0x07f8;
 219         origin = asce & _SEGMENT_ENTRY_ORIGIN;
 220         break;
 221     }
 222
 223     /* XXX region protection flags */
 224     /* *flags &= ~PAGE_WRITE */
 225
 226     new_asce = ldq_phys(origin + offs);
 227     PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n",
 228                 __func__, origin, offs, new_asce);
 229
 230     if (level != _ASCE_TYPE_SEGMENT) {
 231         /* yet another region */
 232         return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr,
 233                                   flags, rw);
 234     }
 235
 236     /* PTE */
 237     if (new_asce & _PAGE_INVALID) {
 238         DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __func__, new_asce);
 239         trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
 240         return -1;
 241     }
 242
 243     if (new_asce & _PAGE_RO) {
 244         *flags &= ~PAGE_WRITE;
 245     }
 246
 247     *raddr = new_asce & _ASCE_ORIGIN;
 248
 249     PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __func__, new_asce);
 250
 251     return 0;
 252 }
 253
 254 static int mmu_translate_asc(CPUS390XState *env, target_ulong vaddr,
 255                              uint64_t asc, target_ulong *raddr, int *flags,
 256                              int rw)
 257 {
 258     uint64_t asce = 0;
 259     int level, new_level;
 260     int r;
 261
 262     switch (asc) {
 263     case PSW_ASC_PRIMARY:
 264         PTE_DPRINTF("%s: asc=primary\n", __func__);
 265         asce = env->cregs[1];
 266         break;
 267     case PSW_ASC_SECONDARY:
 268         PTE_DPRINTF("%s: asc=secondary\n", __func__);
 269         asce = env->cregs[7];
 270         break;
 271     case PSW_ASC_HOME:
 272         PTE_DPRINTF("%s: asc=home\n", __func__);
 273         asce = env->cregs[13];
 274         break;
 275     }
 276
 277     switch (asce & _ASCE_TYPE_MASK) {
 278     case _ASCE_TYPE_REGION1:
 279         break;
 280     case _ASCE_TYPE_REGION2:
 281         if (vaddr & 0xffe0000000000000ULL) {
 282             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 283                     " 0xffe0000000000000ULL\n", __func__, vaddr);
 284             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 285             return -1;
 286         }
 287         break;
 288     case _ASCE_TYPE_REGION3:
 289         if (vaddr & 0xfffffc0000000000ULL) {
 290             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 291                     " 0xfffffc0000000000ULL\n", __func__, vaddr);
 292             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 293             return -1;
 294         }
 295         break;
 296     case _ASCE_TYPE_SEGMENT:
 297         if (vaddr & 0xffffffff80000000ULL) {
 298             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 299                     " 0xffffffff80000000ULL\n", __func__, vaddr);
 300             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 301             return -1;
 302         }
 303         break;
 304     }
 305
 306     /* fake level above current */
 307     level = asce & _ASCE_TYPE_MASK;
 308     new_level = level + 4;
 309     asce = (asce & ~_ASCE_TYPE_MASK) | (new_level & _ASCE_TYPE_MASK);
 310
 311     r = mmu_translate_asce(env, vaddr, asc, asce, new_level, raddr, flags, rw);
 312
 313     if ((rw == 1) && !(*flags & PAGE_WRITE)) {
 314         trigger_prot_fault(env, vaddr, asc);
 315         return -1;
 316     }
 317
 318     return r;
 319 }
 320
 321 int mmu_translate(CPUS390XState *env, target_ulong vaddr, int rw, uint64_t asc,
 322                   target_ulong *raddr, int *flags)
 323 {
 324     int r = -1;
 325     uint8_t *sk;
 326
 327     *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 328     vaddr &= TARGET_PAGE_MASK;
 329
 330     if (!(env->psw.mask & PSW_MASK_DAT)) {
 331         *raddr = vaddr;
 332         r = 0;
 333         goto out;
 334     }
 335
 336     switch (asc) {
 337     case PSW_ASC_PRIMARY:
 338     case PSW_ASC_HOME:
 339         r = mmu_translate_asc(env, vaddr, asc, raddr, flags, rw);
 340         break;
 341     case PSW_ASC_SECONDARY:
 342         /*
 343          * Instruction: Primary
 344          * Data: Secondary
 345          */
 346         if (rw == 2) {
 347             r = mmu_translate_asc(env, vaddr, PSW_ASC_PRIMARY, raddr, flags,
 348                                   rw);
 349             *flags &= ~(PAGE_READ | PAGE_WRITE);
 350         } else {
 351             r = mmu_translate_asc(env, vaddr, PSW_ASC_SECONDARY, raddr, flags,
 352                                   rw);
 353             *flags &= ~(PAGE_EXEC);
 354         }
 355         break;
 356     case PSW_ASC_ACCREG:
 357     default:
 358         hw_error("guest switched to unknown asc mode\n");
 359         break;
 360     }
 361
 362  out:
 363     /* Convert real address -> absolute address */
 364     if (*raddr < 0x2000) {
 365         *raddr = *raddr + env->psa;
 366     }
 367
 368     if (*raddr <= ram_size) {
 369         sk = &env->storage_keys[*raddr / TARGET_PAGE_SIZE];
 370         if (*flags & PAGE_READ) {
 371             *sk |= SK_R;
 372         }
 373
 374         if (*flags & PAGE_WRITE) {
 375             *sk |= SK_C;
 376         }
 377     }
 378
 379     return r;
 380 }
 381
 382 int cpu_s390x_handle_mmu_fault(CPUS390XState *env, target_ulong orig_vaddr,
 383                                int rw, int mmu_idx)
 384 {
 385     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 386     target_ulong vaddr, raddr;
 387     int prot;
 388
 389     DPRINTF("%s: address 0x%" PRIx64 " rw %d mmu_idx %d\n",
 390             __func__, _vaddr, rw, mmu_idx);
 391
 392     orig_vaddr &= TARGET_PAGE_MASK;
 393     vaddr = orig_vaddr;
 394
 395     /* 31-Bit mode */
 396     if (!(env->psw.mask & PSW_MASK_64)) {
 397         vaddr &= 0x7fffffff;
 398     }
 399
 400     if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot)) {
 401         /* Translation ended in exception */
 402         return 1;
 403     }
 404
 405     /* check out of RAM access */
 406     if (raddr > (ram_size + virtio_size)) {
 407         DPRINTF("%s: aaddr %" PRIx64 " > ram_size %" PRIx64 "\n", __func__,
 408                 (uint64_t)aaddr, (uint64_t)ram_size);
 409         trigger_pgm_exception(env, PGM_ADDRESSING, ILC_LATER);
 410         return 1;
 411     }
 412
 413     DPRINTF("%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", __func__,
 414             (uint64_t)vaddr, (uint64_t)raddr, prot);
 415
 416     tlb_set_page(env, orig_vaddr, raddr, prot,
 417                  mmu_idx, TARGET_PAGE_SIZE);
 418
 419     return 0;
 420 }
 421
 422 hwaddr cpu_get_phys_page_debug(CPUS390XState *env,
 423                                            target_ulong vaddr)
 424 {
 425     target_ulong raddr;
 426     int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 427     int old_exc = env->exception_index;
 428     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 429
 430     /* 31-Bit mode */
 431     if (!(env->psw.mask & PSW_MASK_64)) {
 432         vaddr &= 0x7fffffff;
 433     }
 434
 435     mmu_translate(env, vaddr, 2, asc, &raddr, &prot);
 436     env->exception_index = old_exc;
 437
 438     return raddr;
 439 }
 440
 441 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 442 {
 443     if (mask & PSW_MASK_WAIT) {
 444         if (!(mask & (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK))) {
 445             if (s390_del_running_cpu(env) == 0) {
 446 #ifndef CONFIG_USER_ONLY
 447                 qemu_system_shutdown_request();
 448 #endif
 449             }
 450         }
 451         env->halted = 1;
 452         env->exception_index = EXCP_HLT;
 453     }
 454
 455     env->psw.addr = addr;
 456     env->psw.mask = mask;
 457     env->cc_op = (mask >> 13) & 3;
 458 }
 459
 460 static uint64_t get_psw_mask(CPUS390XState *env)
 461 {
 462     uint64_t r = env->psw.mask;
 463
 464     env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr);
 465
 466     r &= ~(3ULL << 13);
 467     assert(!(env->cc_op & ~3));
 468     r |= env->cc_op << 13;
 469
 470     return r;
 471 }
 472
 473 static void do_svc_interrupt(CPUS390XState *env)
 474 {
 475     uint64_t mask, addr;
 476     LowCore *lowcore;
 477     hwaddr len = TARGET_PAGE_SIZE;
 478
 479     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 480
 481     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 482     lowcore->svc_ilc = cpu_to_be16(env->int_svc_ilc);
 483     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 484     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + (env->int_svc_ilc));
 485     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 486     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 487
 488     cpu_physical_memory_unmap(lowcore, len, 1, len);
 489
 490     load_psw(env, mask, addr);
 491 }
 492
 493 static void do_program_interrupt(CPUS390XState *env)
 494 {
 495     uint64_t mask, addr;
 496     LowCore *lowcore;
 497     hwaddr len = TARGET_PAGE_SIZE;
 498     int ilc = env->int_pgm_ilc;
 499
 500     switch (ilc) {
 501     case ILC_LATER:
 502         ilc = get_ilc(cpu_ldub_code(env, env->psw.addr));
 503         break;
 504     case ILC_LATER_INC:
 505         ilc = get_ilc(cpu_ldub_code(env, env->psw.addr));
 506         env->psw.addr += ilc * 2;
 507         break;
 508     case ILC_LATER_INC_2:
 509         ilc = get_ilc(cpu_ldub_code(env, env->psw.addr)) * 2;
 510         env->psw.addr += ilc;
 511         break;
 512     }
 513
 514     qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilc=%d\n",
 515                   __func__, env->int_pgm_code, ilc);
 516
 517     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 518
 519     lowcore->pgm_ilc = cpu_to_be16(ilc);
 520     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 521     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 522     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 523     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 524     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 525
 526     cpu_physical_memory_unmap(lowcore, len, 1, len);
 527
 528     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
 529             env->int_pgm_code, ilc, env->psw.mask,
 530             env->psw.addr);
 531
 532     load_psw(env, mask, addr);
 533 }
 534
 535 #define VIRTIO_SUBCODE_64 0x0D00
 536
 537 static void do_ext_interrupt(CPUS390XState *env)
 538 {
 539     uint64_t mask, addr;
 540     LowCore *lowcore;
 541     hwaddr len = TARGET_PAGE_SIZE;
 542     ExtQueue *q;
 543
 544     if (!(env->psw.mask & PSW_MASK_EXT)) {
 545         cpu_abort(env, "Ext int w/o ext mask\n");
 546     }
 547
 548     if (env->ext_index < 0 || env->ext_index > MAX_EXT_QUEUE) {
 549         cpu_abort(env, "Ext queue overrun: %d\n", env->ext_index);
 550     }
 551
 552     q = &env->ext_queue[env->ext_index];
 553     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 554
 555     lowcore->ext_int_code = cpu_to_be16(q->code);
 556     lowcore->ext_params = cpu_to_be32(q->param);
 557     lowcore->ext_params2 = cpu_to_be64(q->param64);
 558     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 559     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 560     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 561     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 562     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 563
 564     cpu_physical_memory_unmap(lowcore, len, 1, len);
 565
 566     env->ext_index--;
 567     if (env->ext_index == -1) {
 568         env->pending_int &= ~INTERRUPT_EXT;
 569     }
 570
 571     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 572             env->psw.mask, env->psw.addr);
 573
 574     load_psw(env, mask, addr);
 575 }
 576
 577 void do_interrupt(CPUS390XState *env)
 578 {
 579     qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
 580                   __func__, env->exception_index, env->psw.addr);
 581
 582     s390_add_running_cpu(env);
 583     /* handle external interrupts */
 584     if ((env->psw.mask & PSW_MASK_EXT) &&
 585         env->exception_index == -1) {
 586         if (env->pending_int & INTERRUPT_EXT) {
 587             /* code is already in env */
 588             env->exception_index = EXCP_EXT;
 589         } else if (env->pending_int & INTERRUPT_TOD) {
 590             cpu_inject_ext(env, 0x1004, 0, 0);
 591             env->exception_index = EXCP_EXT;
 592             env->pending_int &= ~INTERRUPT_EXT;
 593             env->pending_int &= ~INTERRUPT_TOD;
 594         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 595             cpu_inject_ext(env, 0x1005, 0, 0);
 596             env->exception_index = EXCP_EXT;
 597             env->pending_int &= ~INTERRUPT_EXT;
 598             env->pending_int &= ~INTERRUPT_TOD;
 599         }
 600     }
 601
 602     switch (env->exception_index) {
 603     case EXCP_PGM:
 604         do_program_interrupt(env);
 605         break;
 606     case EXCP_SVC:
 607         do_svc_interrupt(env);
 608         break;
 609     case EXCP_EXT:
 610         do_ext_interrupt(env);
 611         break;
 612     }
 613     env->exception_index = -1;
 614
 615     if (!env->pending_int) {
 616         env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 617     }
 618 }
 619
 620 #endif /* CONFIG_USER_ONLY */