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 = env->psw.mask & PSW_MASK_ASC;
 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, 2, 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     env->psw.addr = addr;
 185     env->psw.mask = mask;
 186     env->cc_op = (mask >> 44) & 3;
 187
 188     if (mask & PSW_MASK_WAIT) {
 189         S390CPU *cpu = s390_env_get_cpu(env);
 190         if (s390_cpu_halt(cpu) == 0) {
 191 #ifndef CONFIG_USER_ONLY
 192             qemu_system_shutdown_request();
 193 #endif
 194         }
 195     }
 196 }
 197
 198 static uint64_t get_psw_mask(CPUS390XState *env)
 199 {
 200     uint64_t r;
 201
 202     env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst, env->cc_vr);
 203
 204     r = env->psw.mask;
 205     r &= ~PSW_MASK_CC;
 206     assert(!(env->cc_op & ~3));
 207     r |= (uint64_t)env->cc_op << 44;
 208
 209     return r;
 210 }
 211
 212 static LowCore *cpu_map_lowcore(CPUS390XState *env)
 213 {
 214     S390CPU *cpu = s390_env_get_cpu(env);
 215     LowCore *lowcore;
 216     hwaddr len = sizeof(LowCore);
 217
 218     lowcore = cpu_physical_memory_map(env->psa, &len, 1);
 219
 220     if (len < sizeof(LowCore)) {
 221         cpu_abort(CPU(cpu), "Could not map lowcore\n");
 222     }
 223
 224     return lowcore;
 225 }
 226
 227 static void cpu_unmap_lowcore(LowCore *lowcore)
 228 {
 229     cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
 230 }
 231
 232 static void do_svc_interrupt(CPUS390XState *env)
 233 {
 234     uint64_t mask, addr;
 235     LowCore *lowcore;
 236
 237     lowcore = cpu_map_lowcore(env);
 238
 239     lowcore->svc_code = cpu_to_be16(env->int_svc_code);
 240     lowcore->svc_ilen = cpu_to_be16(env->int_svc_ilen);
 241     lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 242     lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
 243     mask = be64_to_cpu(lowcore->svc_new_psw.mask);
 244     addr = be64_to_cpu(lowcore->svc_new_psw.addr);
 245
 246     cpu_unmap_lowcore(lowcore);
 247
 248     load_psw(env, mask, addr);
 249 }
 250
 251 static void do_program_interrupt(CPUS390XState *env)
 252 {
 253     uint64_t mask, addr;
 254     LowCore *lowcore;
 255     int ilen = env->int_pgm_ilen;
 256
 257     switch (ilen) {
 258     case ILEN_LATER:
 259         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 260         break;
 261     case ILEN_LATER_INC:
 262         ilen = get_ilen(cpu_ldub_code(env, env->psw.addr));
 263         env->psw.addr += ilen;
 264         break;
 265     default:
 266         assert(ilen == 2 || ilen == 4 || ilen == 6);
 267     }
 268
 269     qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilen=%d\n",
 270                   __func__, env->int_pgm_code, ilen);
 271
 272     lowcore = cpu_map_lowcore(env);
 273
 274     lowcore->pgm_ilen = cpu_to_be16(ilen);
 275     lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
 276     lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 277     lowcore->program_old_psw.addr = cpu_to_be64(env->psw.addr);
 278     mask = be64_to_cpu(lowcore->program_new_psw.mask);
 279     addr = be64_to_cpu(lowcore->program_new_psw.addr);
 280
 281     cpu_unmap_lowcore(lowcore);
 282
 283     DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
 284             env->int_pgm_code, ilen, env->psw.mask,
 285             env->psw.addr);
 286
 287     load_psw(env, mask, addr);
 288 }
 289
 290 #define VIRTIO_SUBCODE_64 0x0D00
 291
 292 static void do_ext_interrupt(CPUS390XState *env)
 293 {
 294     S390CPU *cpu = s390_env_get_cpu(env);
 295     uint64_t mask, addr;
 296     LowCore *lowcore;
 297     ExtQueue *q;
 298
 299     if (!(env->psw.mask & PSW_MASK_EXT)) {
 300         cpu_abort(CPU(cpu), "Ext int w/o ext mask\n");
 301     }
 302
 303     if (env->ext_index < 0 || env->ext_index >= MAX_EXT_QUEUE) {
 304         cpu_abort(CPU(cpu), "Ext queue overrun: %d\n", env->ext_index);
 305     }
 306
 307     q = &env->ext_queue[env->ext_index];
 308     lowcore = cpu_map_lowcore(env);
 309
 310     lowcore->ext_int_code = cpu_to_be16(q->code);
 311     lowcore->ext_params = cpu_to_be32(q->param);
 312     lowcore->ext_params2 = cpu_to_be64(q->param64);
 313     lowcore->external_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 314     lowcore->external_old_psw.addr = cpu_to_be64(env->psw.addr);
 315     lowcore->cpu_addr = cpu_to_be16(env->cpu_num | VIRTIO_SUBCODE_64);
 316     mask = be64_to_cpu(lowcore->external_new_psw.mask);
 317     addr = be64_to_cpu(lowcore->external_new_psw.addr);
 318
 319     cpu_unmap_lowcore(lowcore);
 320
 321     env->ext_index--;
 322     if (env->ext_index == -1) {
 323         env->pending_int &= ~INTERRUPT_EXT;
 324     }
 325
 326     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 327             env->psw.mask, env->psw.addr);
 328
 329     load_psw(env, mask, addr);
 330 }
 331
 332 static void do_io_interrupt(CPUS390XState *env)
 333 {
 334     S390CPU *cpu = s390_env_get_cpu(env);
 335     LowCore *lowcore;
 336     IOIntQueue *q;
 337     uint8_t isc;
 338     int disable = 1;
 339     int found = 0;
 340
 341     if (!(env->psw.mask & PSW_MASK_IO)) {
 342         cpu_abort(CPU(cpu), "I/O int w/o I/O mask\n");
 343     }
 344
 345     for (isc = 0; isc < ARRAY_SIZE(env->io_index); isc++) {
 346         uint64_t isc_bits;
 347
 348         if (env->io_index[isc] < 0) {
 349             continue;
 350         }
 351         if (env->io_index[isc] >= MAX_IO_QUEUE) {
 352             cpu_abort(CPU(cpu), "I/O queue overrun for isc %d: %d\n",
 353                       isc, env->io_index[isc]);
 354         }
 355
 356         q = &env->io_queue[env->io_index[isc]][isc];
 357         isc_bits = ISC_TO_ISC_BITS(IO_INT_WORD_ISC(q->word));
 358         if (!(env->cregs[6] & isc_bits)) {
 359             disable = 0;
 360             continue;
 361         }
 362         if (!found) {
 363             uint64_t mask, addr;
 364
 365             found = 1;
 366             lowcore = cpu_map_lowcore(env);
 367
 368             lowcore->subchannel_id = cpu_to_be16(q->id);
 369             lowcore->subchannel_nr = cpu_to_be16(q->nr);
 370             lowcore->io_int_parm = cpu_to_be32(q->parm);
 371             lowcore->io_int_word = cpu_to_be32(q->word);
 372             lowcore->io_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 373             lowcore->io_old_psw.addr = cpu_to_be64(env->psw.addr);
 374             mask = be64_to_cpu(lowcore->io_new_psw.mask);
 375             addr = be64_to_cpu(lowcore->io_new_psw.addr);
 376
 377             cpu_unmap_lowcore(lowcore);
 378
 379             env->io_index[isc]--;
 380
 381             DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 382                     env->psw.mask, env->psw.addr);
 383             load_psw(env, mask, addr);
 384         }
 385         if (env->io_index[isc] >= 0) {
 386             disable = 0;
 387         }
 388         continue;
 389     }
 390
 391     if (disable) {
 392         env->pending_int &= ~INTERRUPT_IO;
 393     }
 394
 395 }
 396
 397 static void do_mchk_interrupt(CPUS390XState *env)
 398 {
 399     S390CPU *cpu = s390_env_get_cpu(env);
 400     uint64_t mask, addr;
 401     LowCore *lowcore;
 402     MchkQueue *q;
 403     int i;
 404
 405     if (!(env->psw.mask & PSW_MASK_MCHECK)) {
 406         cpu_abort(CPU(cpu), "Machine check w/o mchk mask\n");
 407     }
 408
 409     if (env->mchk_index < 0 || env->mchk_index >= MAX_MCHK_QUEUE) {
 410         cpu_abort(CPU(cpu), "Mchk queue overrun: %d\n", env->mchk_index);
 411     }
 412
 413     q = &env->mchk_queue[env->mchk_index];
 414
 415     if (q->type != 1) {
 416         /* Don't know how to handle this... */
 417         cpu_abort(CPU(cpu), "Unknown machine check type %d\n", q->type);
 418     }
 419     if (!(env->cregs[14] & (1 << 28))) {
 420         /* CRW machine checks disabled */
 421         return;
 422     }
 423
 424     lowcore = cpu_map_lowcore(env);
 425
 426     for (i = 0; i < 16; i++) {
 427         lowcore->floating_pt_save_area[i] = cpu_to_be64(env->fregs[i].ll);
 428         lowcore->gpregs_save_area[i] = cpu_to_be64(env->regs[i]);
 429         lowcore->access_regs_save_area[i] = cpu_to_be32(env->aregs[i]);
 430         lowcore->cregs_save_area[i] = cpu_to_be64(env->cregs[i]);
 431     }
 432     lowcore->prefixreg_save_area = cpu_to_be32(env->psa);
 433     lowcore->fpt_creg_save_area = cpu_to_be32(env->fpc);
 434     lowcore->tod_progreg_save_area = cpu_to_be32(env->todpr);
 435     lowcore->cpu_timer_save_area[0] = cpu_to_be32(env->cputm >> 32);
 436     lowcore->cpu_timer_save_area[1] = cpu_to_be32((uint32_t)env->cputm);
 437     lowcore->clock_comp_save_area[0] = cpu_to_be32(env->ckc >> 32);
 438     lowcore->clock_comp_save_area[1] = cpu_to_be32((uint32_t)env->ckc);
 439
 440     lowcore->mcck_interruption_code[0] = cpu_to_be32(0x00400f1d);
 441     lowcore->mcck_interruption_code[1] = cpu_to_be32(0x40330000);
 442     lowcore->mcck_old_psw.mask = cpu_to_be64(get_psw_mask(env));
 443     lowcore->mcck_old_psw.addr = cpu_to_be64(env->psw.addr);
 444     mask = be64_to_cpu(lowcore->mcck_new_psw.mask);
 445     addr = be64_to_cpu(lowcore->mcck_new_psw.addr);
 446
 447     cpu_unmap_lowcore(lowcore);
 448
 449     env->mchk_index--;
 450     if (env->mchk_index == -1) {
 451         env->pending_int &= ~INTERRUPT_MCHK;
 452     }
 453
 454     DPRINTF("%s: %" PRIx64 " %" PRIx64 "\n", __func__,
 455             env->psw.mask, env->psw.addr);
 456
 457     load_psw(env, mask, addr);
 458 }
 459
 460 void s390_cpu_do_interrupt(CPUState *cs)
 461 {
 462     S390CPU *cpu = S390_CPU(cs);
 463     CPUS390XState *env = &cpu->env;
 464
 465     qemu_log_mask(CPU_LOG_INT, "%s: %d at pc=%" PRIx64 "\n",
 466                   __func__, cs->exception_index, env->psw.addr);
 467
 468     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
 469     /* handle machine checks */
 470     if ((env->psw.mask & PSW_MASK_MCHECK) &&
 471         (cs->exception_index == -1)) {
 472         if (env->pending_int & INTERRUPT_MCHK) {
 473             cs->exception_index = EXCP_MCHK;
 474         }
 475     }
 476     /* handle external interrupts */
 477     if ((env->psw.mask & PSW_MASK_EXT) &&
 478         cs->exception_index == -1) {
 479         if (env->pending_int & INTERRUPT_EXT) {
 480             /* code is already in env */
 481             cs->exception_index = EXCP_EXT;
 482         } else if (env->pending_int & INTERRUPT_TOD) {
 483             cpu_inject_ext(cpu, 0x1004, 0, 0);
 484             cs->exception_index = EXCP_EXT;
 485             env->pending_int &= ~INTERRUPT_EXT;
 486             env->pending_int &= ~INTERRUPT_TOD;
 487         } else if (env->pending_int & INTERRUPT_CPUTIMER) {
 488             cpu_inject_ext(cpu, 0x1005, 0, 0);
 489             cs->exception_index = EXCP_EXT;
 490             env->pending_int &= ~INTERRUPT_EXT;
 491             env->pending_int &= ~INTERRUPT_TOD;
 492         }
 493     }
 494     /* handle I/O interrupts */
 495     if ((env->psw.mask & PSW_MASK_IO) &&
 496         (cs->exception_index == -1)) {
 497         if (env->pending_int & INTERRUPT_IO) {
 498             cs->exception_index = EXCP_IO;
 499         }
 500     }
 501
 502     switch (cs->exception_index) {
 503     case EXCP_PGM:
 504         do_program_interrupt(env);
 505         break;
 506     case EXCP_SVC:
 507         do_svc_interrupt(env);
 508         break;
 509     case EXCP_EXT:
 510         do_ext_interrupt(env);
 511         break;
 512     case EXCP_IO:
 513         do_io_interrupt(env);
 514         break;
 515     case EXCP_MCHK:
 516         do_mchk_interrupt(env);
 517         break;
 518     }
 519     cs->exception_index = -1;
 520
 521     if (!env->pending_int) {
 522         cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
 523     }
 524 }
 525
 526 bool s390_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 527 {
 528     if (interrupt_request & CPU_INTERRUPT_HARD) {
 529         S390CPU *cpu = S390_CPU(cs);
 530         CPUS390XState *env = &cpu->env;
 531
 532         if (env->psw.mask & PSW_MASK_EXT) {
 533             s390_cpu_do_interrupt(cs);
 534             return true;
 535         }
 536     }
 537     return false;
 538 }
 539 #endif /* CONFIG_USER_ONLY */