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 #include "exec/cpu_ldst.h"
  25 #ifndef CONFIG_USER_ONLY
  26 #include "sysemu/sysemu.h"
  27 #endif
  28
  29 //#define DEBUG_S390
  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
  47 #ifndef CONFIG_USER_ONLY
  48 void s390x_tod_timer(void *opaque)
  49 {
  50     S390CPU *cpu = opaque;
  51     CPUS390XState *env = &cpu->env;
  52
  53     env->pending_int |= INTERRUPT_TOD;
  54     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  55 }
  56
  57 void s390x_cpu_timer(void *opaque)
  58 {
  59     S390CPU *cpu = opaque;
  60     CPUS390XState *env = &cpu->env;
  61
  62     env->pending_int |= INTERRUPT_CPUTIMER;
  63     cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
  64 }
  65 #endif
  66
  67 S390CPU *cpu_s390x_init(const char *cpu_model)
  68 {
  69     S390CPU *cpu;
  70
  71     cpu = S390_CPU(object_new(TYPE_S390_CPU));
  72
  73     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
  74
  75     return cpu;
  76 }
  77
  78 #if defined(CONFIG_USER_ONLY)
  79
  80 void s390_cpu_do_interrupt(CPUState *cs)
  81 {
  82     cs->exception_index = -1;
  83 }
  84
  85 int s390_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
  86                               int rw, int mmu_idx)
  87 {
  88     S390CPU *cpu = S390_CPU(cs);
  89
  90     cs->exception_index = EXCP_PGM;
  91     cpu->env.int_pgm_code = PGM_ADDRESSING;
  92     /* On real machines this value is dropped into LowMem.  Since this
  93        is userland, simply put this someplace that cpu_loop can find it.  */
  94     cpu->env.__excp_addr = address;
  95     return 1;
  96 }
  97
  98 #else /* !CONFIG_USER_ONLY */
  99
 100 /* Ensure to exit the TB after this call! */
 101 void trigger_pgm_exception(CPUS390XState *env, uint32_t code, uint32_t ilen)
 102 {
 103     CPUState *cs = CPU(s390_env_get_cpu(env));
 104
 105     cs->exception_index = EXCP_PGM;
 106     env->int_pgm_code = code;
 107     env->int_pgm_ilen = ilen;
 108 }
 109
 110 int s390_cpu_handle_mmu_fault(CPUState *cs, vaddr orig_vaddr,
 111                               int rw, int mmu_idx)
 112 {
 113     S390CPU *cpu = S390_CPU(cs);
 114     CPUS390XState *env = &cpu->env;
 115     uint64_t asc = cpu_mmu_idx_to_asc(mmu_idx);
 116     target_ulong vaddr, raddr;
 117     int prot;
 118
 119     DPRINTF("%s: address 0x%" VADDR_PRIx " rw %d mmu_idx %d\n",
 120             __func__, orig_vaddr, rw, mmu_idx);
 121
 122     orig_vaddr &= TARGET_PAGE_MASK;
 123     vaddr = orig_vaddr;
 124
 125     /* 31-Bit mode */
 126     if (!(env->psw.mask & PSW_MASK_64)) {
 127         vaddr &= 0x7fffffff;
 128     }
 129
 130     if (mmu_translate(env, vaddr, rw, asc, &raddr, &prot, true)) {
 131         /* Translation ended in exception */
 132         return 1;
 133     }
 134
 135     /* check out of RAM access */
 136     if (raddr > (ram_size + virtio_size)) {
 137         DPRINTF("%s: raddr %" PRIx64 " > ram_size %" PRIx64 "\n", __func__,
 138                 (uint64_t)raddr, (uint64_t)ram_size);
 139         trigger_pgm_exception(env, PGM_ADDRESSING, ILEN_LATER);
 140         return 1;
 141     }
 142
 143     qemu_log_mask(CPU_LOG_MMU, "%s: set tlb %" PRIx64 " -> %" PRIx64 " (%x)\n",
 144             __func__, (uint64_t)vaddr, (uint64_t)raddr, prot);
 145
 146     tlb_set_page(cs, orig_vaddr, raddr, prot,
 147                  mmu_idx, TARGET_PAGE_SIZE);
 148
 149     return 0;
 150 }
 151
 152 hwaddr s390_cpu_get_phys_page_debug(CPUState *cs, vaddr vaddr)
 153 {
 154     S390CPU *cpu = S390_CPU(cs);
 155     CPUS390XState *env = &cpu->env;
 156     target_ulong raddr;
 157     int prot;
 158     uint64_t asc = env->psw.mask & PSW_MASK_ASC;
 159
 160     /* 31-Bit mode */
 161     if (!(env->psw.mask & PSW_MASK_64)) {
 162         vaddr &= 0x7fffffff;
 163     }
 164
 165     mmu_translate(env, vaddr, MMU_INST_FETCH, asc, &raddr, &prot, false);
 166
 167     return raddr;
 168 }
 169
 170 hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
 171 {
 172     hwaddr phys_addr;
 173     target_ulong page;
 174
 175     page = vaddr & TARGET_PAGE_MASK;
 176     phys_addr = cpu_get_phys_page_debug(cs, page);
 177     phys_addr += (vaddr & ~TARGET_PAGE_MASK);
 178
 179     return phys_addr;
 180 }
 181
 182 void load_psw(CPUS390XState *env, uint64_t mask, uint64_t addr)
 183 {
 184     uint64_t old_mask = env->psw.mask;
 185
 186     env->psw.addr = addr;
 187     env->psw.mask = mask;
 188     if (tcg_enabled()) {
 189         env->cc_op = (mask >> 44) & 3;
 190     }
 191
 192     if ((old_mask ^ mask) & PSW_MASK_PER) {
 193         s390_cpu_recompute_watchpoints(CPU(s390_env_get_cpu(env)));
 194     }
 195
 196     if (mask & PSW_MASK_WAIT) {
 197         S390CPU *cpu = s390_env_get_cpu(env);
 198         if (s390_cpu_halt(cpu) == 0) {
 199 #ifndef CONFIG_USER_ONLY
 200             qemu_system_shutdown_request();
 201 #endif
 202         }
 203     }
 204 }
 205
 206 static uint64_t get_psw_mask(CPUS390XState *env)
 207 {
 208     uint64_t r = env->psw.mask;
 209
 210     if (tcg_enabled()) {
 211         env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst,
 212                              env->cc_vr);
 213
 214         r &= ~PSW_MASK_CC;
 215         assert(!(env->cc_op & ~3));
 216         r |= (uint64_t)env->cc_op << 44;
 217     }
 218
 219     return r;
 220 }
 221
 222 static LowCore *cpu_map_lowcore(CPUS390XState *env)
 223 {
 224     S390CPU *cpu = s390_env_get_cpu(env);
 225     LowCore *lowcore;
 226     hwaddr len = sizeof(LowCore);
 227
 228     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 229
 230     if (len < sizeof(LowCore)) {
 231         cpu_abort(CPU(cpu), "Could not map lowcore\n");
 232     }
 233
 234     return lowcore;
 235 }
 236
 237 static void cpu_unmap_lowcore(LowCore *lowcore)
 238 {
 239     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 240 }
 241
 242 void do_restart_interrupt(CPUS390XState *env)
 243 {
 244     uint64_t mask, addr;
 245     LowCore *lowcore;
 246
 247     lowcore = cpu_map_lowcore(env);
 248
 249     lowcore->restart_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 250     lowcore->restart_old_psw.addr = cpu_to_be64(env->psw.addr);
 251     mask = be64_to_cpu(lowcore->restart_new_psw.mask);
 252     addr = be64_to_cpu(lowcore->restart_new_psw.addr);
 253
 254     cpu_unmap_lowcore(lowcore);
 255
 256     load_psw(env, mask, addr);
 257 }
 258
 259 static void do_program_interrupt(CPUS390XState *env)
 260 {
 261     uint64_t mask, addr;
 262     LowCore *lowcore;
 263     int ilen = env->int_pgm_ilen;
 264
 265     switch (ilen) {
 266     case ILEN_LATER:
 267         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 268         break;
 269     case ILEN_LATER_INC:
 270         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 271         env->psw.addr += ilen;
 272         break;
 273     default:
 274         assert(ilen == 2 || ilen == 4 || ilen == 6);
 275     }
 276
 277     qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilen=%d\n",
 278                   __func__, env->int_pgm_code, ilen);
 279
 280     lowcore = cpu_map_lowcore(env);
 281
 282     /* Signal PER events with the exception.  */
 283     if (env->per_perc_atmid) {
 284         env->int_pgm_code |= PGM_PER;
 285         lowcore->per_address = cpu_to_be64(env->per_address);
 286         lowcore->per_perc_atmid = cpu_to_be16(env->per_perc_atmid);
 287         env->per_perc_atmid = 0;
 288     }
 289
 290     lowcore->pgm_ilen = cpu_to_be16(ilen);
 291     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 292     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 293     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 294     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 295     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 296     lowcore->per_breaking_event_addr = cpu_to_be64(env->gbea);
 297
 298     cpu_unmap_lowcore(lowcore);
 299
 300     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
 301             env->int_pgm_code, ilen, env->psw.mask,
 302             env->psw.addr);
 303
 304     load_psw(env, mask, addr);
 305 }
 306
 307 static void do_svc_interrupt(CPUS390XState *env)
 308 {
 309     uint64_t mask, addr;
 310     LowCore *lowcore;
 311
 312     lowcore = cpu_map_lowcore(env);
 313
 314     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 315     lowcore->svc_ilen = cpu_to_be16(env->int_svc_ilen);
 316     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 317     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
 318     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 319     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 320
 321     cpu_unmap_lowcore(lowcore);
 322
 323     load_psw(env, mask, addr);
 324
 325     /* When a PER event is pending, the PER exception has to happen
 326        immediately after the SERVICE CALL one.  */
 327     if (env->per_perc_atmid) {
 328         env->int_pgm_code = PGM_PER;
 329         env->int_pgm_ilen = env->int_svc_ilen;
 330         do_program_interrupt(env);
 331     }
 332 }
 333
 334 #define VIRTIO_SUBCODE_64 0x0D00
 335
 336 static void do_ext_interrupt(CPUS390XState *env)
 337 {
 338     S390CPU *cpu = s390_env_get_cpu(env);
 339     uint64_t mask, addr;
 340     LowCore *lowcore;
 341     ExtQueue *q;
 342
 343     if (!(env->psw.mask & PSW_MASK_EXT)) {
 344         cpu_abort(CPU(cpu), "Ext int w/o ext mask\n");
 345     }
 346
 347     if (env->ext_index < 0 || env->ext_index >= MAX_EXT_QUEUE) {
 348         cpu_abort(CPU(cpu), "Ext queue overrun: %d\n", env->ext_index);
 349     }
 350
 351     q = &env->ext_queue[env->ext_index];
 352     lowcore = cpu_map_lowcore(env);
 353
 354     lowcore->ext_int_code = cpu_to_be16(q->code);
 355     lowcore->ext_params = cpu_to_be32(q->param);
 356     lowcore->ext_params2 = cpu_to_be64(q->param64);
 357     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 358     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 359     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 360     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 361     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 362
 363     cpu_unmap_lowcore(lowcore);
 364
 365     env->ext_index--;
 366     if (env->ext_index == -1) {
 367         env->pending_int &= ~INTERRUPT_EXT;
 368     }
 369
 370     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 371             env->psw.mask, env->psw.addr);
 372
 373     load_psw(env, mask, addr);
 374 }
 375
 376 static void do_io_interrupt(CPUS390XState *env)
 377 {
 378     S390CPU *cpu = s390_env_get_cpu(env);
 379     LowCore *lowcore;
 380     IOIntQueue *q;
 381     uint8_t isc;
 382     int disable = 1;
 383     int found = 0;
 384
 385     if (!(env->psw.mask & PSW_MASK_IO)) {
 386         cpu_abort(CPU(cpu), "I/O int w/o I/O mask\n");
 387     }
 388
 389     for (isc = 0; isc < ARRAY_SIZE(env->io_index); isc++) {
 390         uint64_t isc_bits;
 391
 392         if (env->io_index[isc] < 0) {
 393             continue;
 394         }
 395         if (env->io_index[isc] >= MAX_IO_QUEUE) {
 396             cpu_abort(CPU(cpu), "I/O queue overrun for isc %d: %d\n",
 397                       isc, env->io_index[isc]);
 398         }
 399
 400         q = &env->io_queue[env->io_index[isc]][isc];
 401         isc_bits = ISC_TO_ISC_BITS(IO_INT_WORD_ISC(q->word));
 402         if (!(env->cregs[6] & isc_bits)) {
 403             disable = 0;
 404             continue;
 405         }
 406         if (!found) {
 407             uint64_t mask, addr;
 408
 409             found = 1;
 410             lowcore = cpu_map_lowcore(env);
 411
 412             lowcore->subchannel_id = cpu_to_be16(q->id);
 413             lowcore->subchannel_nr = cpu_to_be16(q->nr);
 414             lowcore->io_int_parm = cpu_to_be32(q->parm);
 415             lowcore->io_int_word = cpu_to_be32(q->word);
 416             lowcore->io_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 417             lowcore->io_old_psw.addr = cpu_to_be64(env->psw.addr);
 418             mask = be64_to_cpu(lowcore->io_new_psw.mask);
 419             addr = be64_to_cpu(lowcore->io_new_psw.addr);
 420
 421             cpu_unmap_lowcore(lowcore);
 422
 423             env->io_index[isc]--;
 424
 425             DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 426                     env->psw.mask, env->psw.addr);
 427             load_psw(env, mask, addr);
 428         }
 429         if (env->io_index[isc] >= 0) {
 430             disable = 0;
 431         }
 432         continue;
 433     }
 434
 435     if (disable) {
 436         env->pending_int &= ~INTERRUPT_IO;
 437     }
 438
 439 }
 440
 441 static void do_mchk_interrupt(CPUS390XState *env)
 442 {
 443     S390CPU *cpu = s390_env_get_cpu(env);
 444     uint64_t mask, addr;
 445     LowCore *lowcore;
 446     MchkQueue *q;
 447     int i;
 448
 449     if (!(env->psw.mask & PSW_MASK_MCHECK)) {
 450         cpu_abort(CPU(cpu), "Machine check w/o mchk mask\n");
 451     }
 452
 453     if (env->mchk_index < 0 || env->mchk_index >= MAX_MCHK_QUEUE) {
 454         cpu_abort(CPU(cpu), "Mchk queue overrun: %d\n", env->mchk_index);
 455     }
 456
 457     q = &env->mchk_queue[env->mchk_index];
 458
 459     if (q->type != 1) {
 460         /* Don't know how to handle this... */
 461         cpu_abort(CPU(cpu), "Unknown machine check type %d\n", q->type);
 462     }
 463     if (!(env->cregs[14] & (1 << 28))) {
 464         /* CRW machine checks disabled */
 465         return;
 466     }
 467
 468     lowcore = cpu_map_lowcore(env);
 469
 470     for (i = 0; i < 16; i++) {
 471         lowcore->floating_pt_save_area[i] = cpu_to_be64(get_freg(env, i)->ll);
 472         lowcore->gpregs_save_area[i] = cpu_to_be64(env->regs[i]);
 473         lowcore->access_regs_save_area[i] = cpu_to_be32(env->aregs[i]);
 474         lowcore->cregs_save_area[i] = cpu_to_be64(env->cregs[i]);
 475     }
 476     lowcore->prefixreg_save_area = cpu_to_be32(env->psa);
 477     lowcore->fpt_creg_save_area = cpu_to_be32(env->fpc);
 478     lowcore->tod_progreg_save_area = cpu_to_be32(env->todpr);
 479     lowcore->cpu_timer_save_area[0] = cpu_to_be32(env->cputm >> 32);
 480     lowcore->cpu_timer_save_area[1] = cpu_to_be32((uint32_t)env->cputm);
 481     lowcore->clock_comp_save_area[0] = cpu_to_be32(env->ckc >> 32);
 482     lowcore->clock_comp_save_area[1] = cpu_to_be32((uint32_t)env->ckc);
 483
 484     lowcore->mcck_interruption_code[0] = cpu_to_be32(0x00400f1d);
 485     lowcore->mcck_interruption_code[1] = cpu_to_be32(0x40330000);
 486     lowcore->mcck_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 487     lowcore->mcck_old_psw.addr = cpu_to_be64(env->psw.addr);
 488     mask = be64_to_cpu(lowcore->mcck_new_psw.mask);
 489     addr = be64_to_cpu(lowcore->mcck_new_psw.addr);
 490
 491     cpu_unmap_lowcore(lowcore);
 492
 493     env->mchk_index--;
 494     if (env->mchk_index == -1) {
 495         env->pending_int &= ~INTERRUPT_MCHK;
 496     }
 497
 498     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 499             env->psw.mask, env->psw.addr);
 500
 501     load_psw(env, mask, addr);
 502 }
 503
 504 void s390_cpu_do_interrupt(CPUState *cs)
 505 {
 506     S390CPU *cpu = S390_CPU(cs);
 507     CPUS390XState *env = &cpu->env;
 508
 509     qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
 510                   __func__, cs->exception_index, env->psw.addr);
 511
 512     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 513     /* handle machine checks */
 514     if ((env->psw.mask & PSW_MASK_MCHECK) &&
 515         (cs->exception_index == -1)) {
 516         if (env->pending_int & INTERRUPT_MCHK) {
 517             cs->exception_index = EXCP_MCHK;
 518         }
 519     }
 520     /* handle external interrupts */
 521     if ((env->psw.mask & PSW_MASK_EXT) &&
 522         cs->exception_index == -1) {
 523         if (env->pending_int & INTERRUPT_EXT) {
 524             /* code is already in env */
 525             cs->exception_index = EXCP_EXT;
 526         } else if (env->pending_int & INTERRUPT_TOD) {
 527             cpu_inject_ext(cpu, 0x1004, 0, 0);
 528             cs->exception_index = EXCP_EXT;
 529             env->pending_int &= ~INTERRUPT_EXT;
 530             env->pending_int &= ~INTERRUPT_TOD;
 531         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 532             cpu_inject_ext(cpu, 0x1005, 0, 0);
 533             cs->exception_index = EXCP_EXT;
 534             env->pending_int &= ~INTERRUPT_EXT;
 535             env->pending_int &= ~INTERRUPT_TOD;
 536         }
 537     }
 538     /* handle I/O interrupts */
 539     if ((env->psw.mask & PSW_MASK_IO) &&
 540         (cs->exception_index == -1)) {
 541         if (env->pending_int & INTERRUPT_IO) {
 542             cs->exception_index = EXCP_IO;
 543         }
 544     }
 545
 546     switch (cs->exception_index) {
 547     case EXCP_PGM:
 548         do_program_interrupt(env);
 549         break;
 550     case EXCP_SVC:
 551         do_svc_interrupt(env);
 552         break;
 553     case EXCP_EXT:
 554         do_ext_interrupt(env);
 555         break;
 556     case EXCP_IO:
 557         do_io_interrupt(env);
 558         break;
 559     case EXCP_MCHK:
 560         do_mchk_interrupt(env);
 561         break;
 562     }
 563     cs->exception_index = -1;
 564
 565     if (!env->pending_int) {
 566         cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
 567     }
 568 }
 569
 570 bool s390_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 571 {
 572     if (interrupt_request & CPU_INTERRUPT_HARD) {
 573         S390CPU *cpu = S390_CPU(cs);
 574         CPUS390XState *env = &cpu->env;
 575
 576         if (env->psw.mask & PSW_MASK_EXT) {
 577             s390_cpu_do_interrupt(cs);
 578             return true;
 579         }
 580     }
 581     return false;
 582 }
 583
 584 void s390_cpu_recompute_watchpoints(CPUState *cs)
 585 {
 586     const int wp_flags = BP_CPU | BP_MEM_WRITE | BP_STOP_BEFORE_ACCESS;
 587     S390CPU *cpu = S390_CPU(cs);
 588     CPUS390XState *env = &cpu->env;
 589
 590     /* We are called when the watchpoints have changed. First
 591        remove them all.  */
 592     cpu_watchpoint_remove_all(cs, BP_CPU);
 593
 594     /* Return if PER is not enabled */
 595     if (!(env->psw.mask & PSW_MASK_PER)) {
 596         return;
 597     }
 598
 599     /* Return if storage-alteration event is not enabled.  */
 600     if (!(env->cregs[9] & PER_CR9_EVENT_STORE)) {
 601         return;
 602     }
 603
 604     if (env->cregs[10] == 0 && env->cregs[11] == -1LL) {
 605         /* We can't create a watchoint spanning the whole memory range, so
 606            split it in two parts.   */
 607         cpu_watchpoint_insert(cs, 0, 1ULL << 63, wp_flags, NULL);
 608         cpu_watchpoint_insert(cs, 1ULL << 63, 1ULL << 63, wp_flags, NULL);
 609     } else if (env->cregs[10] > env->cregs[11]) {
 610         /* The address range loops, create two watchpoints.  */
 611         cpu_watchpoint_insert(cs, env->cregs[10], -env->cregs[10],
 612                               wp_flags, NULL);
 613         cpu_watchpoint_insert(cs, 0, env->cregs[11] + 1, wp_flags, NULL);
 614
 615     } else {
 616         /* Default case, create a single watchpoint.  */
 617         cpu_watchpoint_insert(cs, env->cregs[10],
 618                               env->cregs[11] - env->cregs[10] + 1,
 619                               wp_flags, NULL);
 620     }
 621 }
 622
 623 void s390x_cpu_debug_excp_handler(CPUState *cs)
 624 {
 625     S390CPU *cpu = S390_CPU(cs);
 626     CPUS390XState *env = &cpu->env;
 627     CPUWatchpoint *wp_hit = cs->watchpoint_hit;
 628
 629     if (wp_hit && wp_hit->flags & BP_CPU) {
 630         /* FIXME: When the storage-alteration-space control bit is set,
 631            the exception should only be triggered if the memory access
 632            is done using an address space with the storage-alteration-event
 633            bit set.  We have no way to detect that with the current
 634            watchpoint code.  */
 635         cs->watchpoint_hit = NULL;
 636
 637         env->per_address = env->psw.addr;
 638         env->per_perc_atmid |= PER_CODE_EVENT_STORE | get_per_atmid(env);
 639         /* FIXME: We currently no way to detect the address space used
 640            to trigger the watchpoint.  For now just consider it is the
 641            current default ASC. This turn to be true except when MVCP
 642            and MVCS instrutions are not used.  */
 643         env->per_perc_atmid |= env->psw.mask & (PSW_MASK_ASC) >> 46;
 644
 645         /* Remove all watchpoints to re-execute the code.  A PER exception
 646            will be triggered, it will call load_psw which will recompute
 647            the watchpoints.  */
 648         cpu_watchpoint_remove_all(cs, BP_CPU);
 649         cpu_resume_from_signal(cs, NULL);
 650     }
 651 }
 652 #endif /* CONFIG_USER_ONLY */