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 <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "cpu.h"
  26 #include "gdbstub.h"
  27 #include "qemu-common.h"
  28 #include "qemu-timer.h"
  29
  30 //#define DEBUG_S390
  31 //#define DEBUG_S390_PTE
  32 //#define DEBUG_S390_STDOUT
  33
  34 #ifdef DEBUG_S390
  35 #ifdef DEBUG_S390_STDOUT
  36 #define DPRINTF(fmt, ...) \
  37     do { fprintf(stderr, fmt, ## __VA_ARGS__); \
  38          qemu_log(fmt, ##__VA_ARGS__); } while (0)
  39 #else
  40 #define DPRINTF(fmt, ...) \
  41     do { qemu_log(fmt, ## __VA_ARGS__); } while (0)
  42 #endif
  43 #else
  44 #define DPRINTF(fmt, ...) \
  45     do { } while (0)
  46 #endif
  47
  48 #ifdef DEBUG_S390_PTE
  49 #define PTE_DPRINTF DPRINTF
  50 #else
  51 #define PTE_DPRINTF(fmt, ...) \
  52     do { } while (0)
  53 #endif
  54
  55 #ifndef CONFIG_USER_ONLY
  56 static void s390x_tod_timer(void *opaque)
  57 {
  58     CPUState *env = opaque;
  59
  60     env->pending_int |= INTERRUPT_TOD;
  61     cpu_interrupt(env, CPU_INTERRUPT_HARD);
  62 }
  63
  64 static void s390x_cpu_timer(void *opaque)
  65 {
  66     CPUState *env = opaque;
  67
  68     env->pending_int |= INTERRUPT_CPUTIMER;
  69     cpu_interrupt(env, CPU_INTERRUPT_HARD);
  70 }
  71 #endif
  72
  73 CPUS390XState *cpu_s390x_init(const char *cpu_model)
  74 {
  75     CPUS390XState *env;
  76 #if !defined (CONFIG_USER_ONLY)
  77     struct tm tm;
  78 #endif
  79     static int inited = 0;
  80     static int cpu_num = 0;
  81
  82     env = qemu_mallocz(sizeof(CPUS390XState));
  83     cpu_exec_init(env);
  84     if (!inited) {
  85         inited = 1;
  86         s390x_translate_init();
  87     }
  88
  89 #if !defined(CONFIG_USER_ONLY)
  90     qemu_get_timedate(&tm, 0);
  91     env->tod_offset = TOD_UNIX_EPOCH +
  92                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
  93     env->tod_basetime = 0;
  94     env->tod_timer = qemu_new_timer_ns(vm_clock, s390x_tod_timer, env);
  95     env->cpu_timer = qemu_new_timer_ns(vm_clock, s390x_cpu_timer, env);
  96 #endif
  97     env->cpu_model_str = cpu_model;
  98     env->cpu_num = cpu_num++;
  99     env->ext_index = -1;
 100     cpu_reset(env);
 101     qemu_init_vcpu(env);
 102     return env;
 103 }
 104
 105 #if defined(CONFIG_USER_ONLY)
 106
 107 void do_interrupt (CPUState *env)
 108 {
 109     env->exception_index = -1;
 110 }
 111
 112 int cpu_s390x_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
 113                               int mmu_idx, int is_softmmu)
 114 {
 115     /* fprintf(stderr,"%s: address 0x%lx rw %d mmu_idx %d is_softmmu %d\n",
 116             __FUNCTION__, address, rw, mmu_idx, is_softmmu); */
 117     env->exception_index = EXCP_ADDR;
 118     env->__excp_addr = address; /* FIXME: find out how this works on a real machine */
 119     return 1;
 120 }
 121
 122 #endif /* CONFIG_USER_ONLY */
 123
 124 void cpu_reset(CPUS390XState *env)
 125 {
 126     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 127         qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
 128         log_cpu_state(env, 0);
 129     }
 130
 131     memset(env, 0, offsetof(CPUS390XState, breakpoints));
 132     /* FIXME: reset vector? */
 133     tlb_flush(env, 1);
 134 }
 135
 136 #ifndef CONFIG_USER_ONLY
 137
 138 /* Ensure to exit the TB after this call! */
 139 static void trigger_pgm_exception(CPUState *env, uint32_t code, uint32_t ilc)
 140 {
 141     env->exception_index = EXCP_PGM;
 142     env->int_pgm_code = code;
 143     env->int_pgm_ilc = ilc;
 144 }
 145
 146 static int trans_bits(CPUState *env, uint64_t mode)
 147 {
 148     int bits = 0;
 149
 150     switch (mode) {
 151     case PSW_ASC_PRIMARY:
 152         bits = 1;
 153         break;
 154     case PSW_ASC_SECONDARY:
 155         bits = 2;
 156         break;
 157     case PSW_ASC_HOME:
 158         bits = 3;
 159         break;
 160     default:
 161         cpu_abort(env, "unknown asc mode\n");
 162         break;
 163     }
 164
 165     return bits;
 166 }
 167
 168 static void trigger_prot_fault(CPUState *env, target_ulong vaddr, uint64_t mode)
 169 {
 170     int ilc = ILC_LATER_INC_2;
 171     int bits = trans_bits(env, mode) | 4;
 172
 173     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __FUNCTION__, vaddr, bits);
 174
 175     stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 176     trigger_pgm_exception(env, PGM_PROTECTION, ilc);
 177 }
 178
 179 static void trigger_page_fault(CPUState *env, target_ulong vaddr, uint32_t type,
 180                                uint64_t asc, int rw)
 181 {
 182     int ilc = ILC_LATER;
 183     int bits = trans_bits(env, asc);
 184
 185     if (rw == 2) {
 186         /* code has is undefined ilc */
 187         ilc = 2;
 188     }
 189
 190     DPRINTF("%s: vaddr=%016" PRIx64 " bits=%d\n", __FUNCTION__, vaddr, bits);
 191
 192     stq_phys(env->psa + offsetof(LowCore, trans_exc_code), vaddr | bits);
 193     trigger_pgm_exception(env, type, ilc);
 194 }
 195
 196 static int mmu_translate_asce(CPUState *env, target_ulong vaddr, uint64_t asc,
 197                               uint64_t asce, int level, target_ulong *raddr,
 198                               int *flags, int rw)
 199 {
 200     uint64_t offs = 0;
 201     uint64_t origin;
 202     uint64_t new_asce;
 203
 204     PTE_DPRINTF("%s: 0x%" PRIx64 "\n", __FUNCTION__, asce);
 205
 206     if (((level != _ASCE_TYPE_SEGMENT) && (asce & _REGION_ENTRY_INV)) ||
 207         ((level == _ASCE_TYPE_SEGMENT) && (asce & _SEGMENT_ENTRY_INV))) {
 208         /* XXX different regions have different faults */
 209         DPRINTF("%s: invalid region\n", __FUNCTION__);
 210         trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw);
 211         return -1;
 212     }
 213
 214     if ((level <= _ASCE_TYPE_MASK) && ((asce & _ASCE_TYPE_MASK) != level)) {
 215         trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 216         return -1;
 217     }
 218
 219     if (asce & _ASCE_REAL_SPACE) {
 220         /* direct mapping */
 221
 222         *raddr = vaddr;
 223         return 0;
 224     }
 225
 226     origin = asce & _ASCE_ORIGIN;
 227
 228     switch (level) {
 229     case _ASCE_TYPE_REGION1 + 4:
 230         offs = (vaddr >> 50) & 0x3ff8;
 231         break;
 232     case _ASCE_TYPE_REGION1:
 233         offs = (vaddr >> 39) & 0x3ff8;
 234         break;
 235     case _ASCE_TYPE_REGION2:
 236         offs = (vaddr >> 28) & 0x3ff8;
 237         break;
 238     case _ASCE_TYPE_REGION3:
 239         offs = (vaddr >> 17) & 0x3ff8;
 240         break;
 241     case _ASCE_TYPE_SEGMENT:
 242         offs = (vaddr >> 9) & 0x07f8;
 243         origin = asce & _SEGMENT_ENTRY_ORIGIN;
 244         break;
 245     }
 246
 247     /* XXX region protection flags */
 248     /* *flags &= ~PAGE_WRITE */
 249
 250     new_asce = ldq_phys(origin + offs);
 251     PTE_DPRINTF("%s: 0x%" PRIx64 " + 0x%" PRIx64 " => 0x%016" PRIx64 "\n",
 252                 __FUNCTION__, origin, offs, new_asce);
 253
 254     if (level != _ASCE_TYPE_SEGMENT) {
 255         /* yet another region */
 256         return mmu_translate_asce(env, vaddr, asc, new_asce, level - 4, raddr,
 257                                   flags, rw);
 258     }
 259
 260     /* PTE */
 261     if (new_asce & _PAGE_INVALID) {
 262         DPRINTF("%s: PTE=0x%" PRIx64 " invalid\n", __FUNCTION__, new_asce);
 263         trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw);
 264         return -1;
 265     }
 266
 267     if (new_asce & _PAGE_RO) {
 268         *flags &= ~PAGE_WRITE;
 269     }
 270
 271     *raddr = new_asce & _ASCE_ORIGIN;
 272
 273     PTE_DPRINTF("%s: PTE=0x%" PRIx64 "\n", __FUNCTION__, new_asce);
 274
 275     return 0;
 276 }
 277
 278 static int mmu_translate_asc(CPUState *env, target_ulong vaddr, uint64_t asc,
 279                              target_ulong *raddr, int *flags, int rw)
 280 {
 281     uint64_t asce = 0;
 282     int level, new_level;
 283     int r;
 284
 285     switch (asc) {
 286     case PSW_ASC_PRIMARY:
 287         PTE_DPRINTF("%s: asc=primary\n", __FUNCTION__);
 288         asce = env->cregs[1];
 289         break;
 290     case PSW_ASC_SECONDARY:
 291         PTE_DPRINTF("%s: asc=secondary\n", __FUNCTION__);
 292         asce = env->cregs[7];
 293         break;
 294     case PSW_ASC_HOME:
 295         PTE_DPRINTF("%s: asc=home\n", __FUNCTION__);
 296         asce = env->cregs[13];
 297         break;
 298     }
 299
 300     switch (asce & _ASCE_TYPE_MASK) {
 301     case _ASCE_TYPE_REGION1:
 302         break;
 303     case _ASCE_TYPE_REGION2:
 304         if (vaddr & 0xffe0000000000000ULL) {
 305             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 306                         " 0xffe0000000000000ULL\n", __FUNCTION__,
 307                         vaddr);
 308             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 309             return -1;
 310         }
 311         break;
 312     case _ASCE_TYPE_REGION3:
 313         if (vaddr & 0xfffffc0000000000ULL) {
 314             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 315                         " 0xfffffc0000000000ULL\n", __FUNCTION__,
 316                         vaddr);
 317             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 318             return -1;
 319         }
 320         break;
 321     case _ASCE_TYPE_SEGMENT:
 322         if (vaddr & 0xffffffff80000000ULL) {
 323             DPRINTF("%s: vaddr doesn't fit 0x%16" PRIx64
 324                         " 0xffffffff80000000ULL\n", __FUNCTION__,
 325                         vaddr);
 326             trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw);
 327             return -1;
 328         }
 329         break;
 330     }
 331
 332     /* fake level above current */
 333     level = asce & _ASCE_TYPE_MASK;
 334     new_level = level + 4;
 335     asce = (asce & ~_ASCE_TYPE_MASK) | (new_level & _ASCE_TYPE_MASK);
 336
 337     r = mmu_translate_asce(env, vaddr, asc, asce, new_level, raddr, flags, rw);
 338
 339     if ((rw == 1) && !(*flags & PAGE_WRITE)) {
 340         trigger_prot_fault(env, vaddr, asc);
 341         return -1;
 342     }
 343
 344     return r;
 345 }
 346
 347 int mmu_translate(CPUState *env, target_ulong vaddr, int rw, uint64_t asc,
 348                   target_ulong *raddr, int *flags)
 349 {
 350     int r = -1;
 351
 352     *flags = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 353     vaddr &= TARGET_PAGE_MASK;
 354
 355     if (!(env->psw.mask & PSW_MASK_DAT)) {
 356         *raddr = vaddr;
 357         r = 0;
 358         goto out;
 359     }
 360
 361     switch (asc) {
 362     case PSW_ASC_PRIMARY:
 363     case PSW_ASC_HOME:
 364         r = mmu_translate_asc(env, vaddr, asc, raddr, flags, rw);
 365         break;
 366     case PSW_ASC_SECONDARY:
 367         /*
 368          * Instruction: Primary
 369          * Data: Secondary
 370          */
 371         if (rw == 2) {
 372             r = mmu_translate_asc(env, vaddr, PSW_ASC_PRIMARY, raddr, flags,
 373                                   rw);
 374             *flags &= ~(PAGE_READ | PAGE_WRITE);
 375         } else {
 376             r = mmu_translate_asc(env, vaddr, PSW_ASC_SECONDARY, raddr, flags,
 377                                   rw);
 378             *flags &= ~(PAGE_EXEC);
 379         }
 380         break;
 381     case PSW_ASC_ACCREG:
 382     default:
 383         hw_error("guest switched to unknown asc mode\n");
 384         break;
 385     }
 386
 387 out:
 388     /* Convert real address -> absolute address */
 389     if (*raddr < 0x2000) {
 390         *raddr = *raddr + env->psa;
 391     }
 392
 393     return r;
 394 }
 395
 396 int cpu_s390x_handle_mmu_fault (CPUState *env, target_ulong _vaddr, int rw,
 397                                 int mmu_idx, int is_softmmu)
 398 {
 399     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 400     target_ulong vaddr, raddr;
 401     int prot;
 402
 403     DPRINTF("%s: address 0x%" PRIx64 " rw %d mmu_idx %d is_softmmu %d\n",
 404             __FUNCTION__, _vaddr, rw, mmu_idx, is_softmmu);
 405
 406     _vaddr &= TARGET_PAGE_MASK;
 407     vaddr = _vaddr;
 408
 409     /* 31-Bit mode */
 410     if (!(env->psw.mask & PSW_MASK_64)) {
 411         vaddr &= 0x7fffffff;
 412     }
 413
 414     if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot)) {
 415         /* Translation ended in exception */
 416         return 1;
 417     }
 418
 419     /* check out of RAM access */
 420     if (raddr > (ram_size + virtio_size)) {
 421         DPRINTF("%s: aaddr %" PRIx64 " > ram_size %" PRIx64 "\n", __FUNCTION__,
 422                 (uint64_t)aaddr, (uint64_t)ram_size);
 423         trigger_pgm_exception(env, PGM_ADDRESSING, ILC_LATER);
 424         return 1;
 425     }
 426
 427     DPRINTF("%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n", __FUNCTION__,
 428             (uint64_t)vaddr, (uint64_t)raddr, prot);
 429
 430     tlb_set_page(env, _vaddr, raddr, prot,
 431                  mmu_idx, TARGET_PAGE_SIZE);
 432
 433     return 0;
 434 }
 435
 436 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong vaddr)
 437 {
 438     target_ulong raddr;
 439     int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 440     int old_exc = env->exception_index;
 441     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 442
 443     /* 31-Bit mode */
 444     if (!(env->psw.mask & PSW_MASK_64)) {
 445         vaddr &= 0x7fffffff;
 446     }
 447
 448     mmu_translate(env, vaddr, 2, asc, &raddr, &prot);
 449     env->exception_index = old_exc;
 450
 451     return raddr;
 452 }
 453
 454 void load_psw(CPUState *env, uint64_t mask, uint64_t addr)
 455 {
 456     if (mask & PSW_MASK_WAIT) {
 457         env->halted = 1;
 458         env->exception_index = EXCP_HLT;
 459         if (!(mask & (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK))) {
 460             /* XXX disabled wait state - CPU is dead */
 461         }
 462     }
 463
 464     env->psw.addr = addr;
 465     env->psw.mask = mask;
 466     env->cc_op = (mask >> 13) & 3;
 467 }
 468
 469 static uint64_t get_psw_mask(CPUState *env)
 470 {
 471     uint64_t r = env->psw.mask;
 472
 473     env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr);
 474
 475     r &= ~(3ULL << 13);
 476     assert(!(env->cc_op & ~3));
 477     r |= env->cc_op << 13;
 478
 479     return r;
 480 }
 481
 482 static void do_svc_interrupt(CPUState *env)
 483 {
 484     uint64_t mask, addr;
 485     LowCore *lowcore;
 486     target_phys_addr_t len = TARGET_PAGE_SIZE;
 487
 488     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 489
 490     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 491     lowcore->svc_ilc = cpu_to_be16(env->int_svc_ilc);
 492     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 493     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + (env->int_svc_ilc));
 494     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 495     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 496
 497     cpu_physical_memory_unmap(lowcore, len, 1, len);
 498
 499     load_psw(env, mask, addr);
 500 }
 501
 502 static void do_program_interrupt(CPUState *env)
 503 {
 504     uint64_t mask, addr;
 505     LowCore *lowcore;
 506     target_phys_addr_t len = TARGET_PAGE_SIZE;
 507     int ilc = env->int_pgm_ilc;
 508
 509     switch (ilc) {
 510     case ILC_LATER:
 511         ilc = get_ilc(ldub_code(env->psw.addr));
 512         break;
 513     case ILC_LATER_INC:
 514         ilc = get_ilc(ldub_code(env->psw.addr));
 515         env->psw.addr += ilc * 2;
 516         break;
 517     case ILC_LATER_INC_2:
 518         ilc = get_ilc(ldub_code(env->psw.addr)) * 2;
 519         env->psw.addr += ilc;
 520         break;
 521     }
 522
 523     qemu_log("%s: code=0x%x ilc=%d\n", __FUNCTION__, env->int_pgm_code, ilc);
 524
 525     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 526
 527     lowcore->pgm_ilc = cpu_to_be16(ilc);
 528     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 529     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 530     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 531     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 532     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 533
 534     cpu_physical_memory_unmap(lowcore, len, 1, len);
 535
 536     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __FUNCTION__,
 537             env->int_pgm_code, ilc, env->psw.mask,
 538             env->psw.addr);
 539
 540     load_psw(env, mask, addr);
 541 }
 542
 543 #define VIRTIO_SUBCODE_64 0x0D00
 544
 545 static void do_ext_interrupt(CPUState *env)
 546 {
 547     uint64_t mask, addr;
 548     LowCore *lowcore;
 549     target_phys_addr_t len = TARGET_PAGE_SIZE;
 550     ExtQueue *q;
 551
 552     if (!(env->psw.mask & PSW_MASK_EXT)) {
 553         cpu_abort(env, "Ext int w/o ext mask\n");
 554     }
 555
 556     if (env->ext_index < 0 || env->ext_index > MAX_EXT_QUEUE) {
 557         cpu_abort(env, "Ext queue overrun: %d\n", env->ext_index);
 558     }
 559
 560     q = &env->ext_queue[env->ext_index];
 561     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 562
 563     lowcore->ext_int_code = cpu_to_be16(q->code);
 564     lowcore->ext_params = cpu_to_be32(q->param);
 565     lowcore->ext_params2 = cpu_to_be64(q->param64);
 566     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 567     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 568     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 569     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 570     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 571
 572     cpu_physical_memory_unmap(lowcore, len, 1, len);
 573
 574     env->ext_index--;
 575     if (env->ext_index == -1) {
 576         env->pending_int &= ~INTERRUPT_EXT;
 577     }
 578
 579     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __FUNCTION__,
 580             env->psw.mask, env->psw.addr);
 581
 582     load_psw(env, mask, addr);
 583 }
 584
 585 void do_interrupt (CPUState *env)
 586 {
 587     qemu_log("%s: %d at pc=%" PRIx64 "\n", __FUNCTION__, env->exception_index,
 588              env->psw.addr);
 589
 590     /* handle external interrupts */
 591     if ((env->psw.mask & PSW_MASK_EXT) &&
 592         env->exception_index == -1) {
 593         if (env->pending_int & INTERRUPT_EXT) {
 594             /* code is already in env */
 595             env->exception_index = EXCP_EXT;
 596         } else if (env->pending_int & INTERRUPT_TOD) {
 597             cpu_inject_ext(env, 0x1004, 0, 0);
 598             env->exception_index = EXCP_EXT;
 599             env->pending_int &= ~INTERRUPT_EXT;
 600             env->pending_int &= ~INTERRUPT_TOD;
 601         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 602             cpu_inject_ext(env, 0x1005, 0, 0);
 603             env->exception_index = EXCP_EXT;
 604             env->pending_int &= ~INTERRUPT_EXT;
 605             env->pending_int &= ~INTERRUPT_TOD;
 606         }
 607     }
 608
 609     switch (env->exception_index) {
 610     case EXCP_PGM:
 611         do_program_interrupt(env);
 612         break;
 613     case EXCP_SVC:
 614         do_svc_interrupt(env);
 615         break;
 616     case EXCP_EXT:
 617         do_ext_interrupt(env);
 618         break;
 619     }
 620     env->exception_index = -1;
 621
 622     if (!env->pending_int) {
 623         env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 624     }
 625 }
 626
 627 #endif /* CONFIG_USER_ONLY */