target/i386/misc_helper.c

   1 /*
   2  *  x86 misc helpers
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu/main-loop.h"
  22 #include "cpu.h"
  23 #include "exec/helper-proto.h"
  24 #include "exec/exec-all.h"
  25 #include "exec/cpu_ldst.h"
  26 #include "exec/address-spaces.h"
  27
  28 void helper_outb(CPUX86State *env, uint32_t port, uint32_t data)
  29 {
  30 #ifdef CONFIG_USER_ONLY
  31     fprintf(stderr, "outb: port=0x%04x, data=%02x\n", port, data);
  32 #else
  33     address_space_stb(&address_space_io, port, data,
  34                       cpu_get_mem_attrs(env), NULL);
  35 #endif
  36 }
  37
  38 target_ulong helper_inb(CPUX86State *env, uint32_t port)
  39 {
  40 #ifdef CONFIG_USER_ONLY
  41     fprintf(stderr, "inb: port=0x%04x\n", port);
  42     return 0;
  43 #else
  44     return address_space_ldub(&address_space_io, port,
  45                               cpu_get_mem_attrs(env), NULL);
  46 #endif
  47 }
  48
  49 void helper_outw(CPUX86State *env, uint32_t port, uint32_t data)
  50 {
  51 #ifdef CONFIG_USER_ONLY
  52     fprintf(stderr, "outw: port=0x%04x, data=%04x\n", port, data);
  53 #else
  54     address_space_stw(&address_space_io, port, data,
  55                       cpu_get_mem_attrs(env), NULL);
  56 #endif
  57 }
  58
  59 target_ulong helper_inw(CPUX86State *env, uint32_t port)
  60 {
  61 #ifdef CONFIG_USER_ONLY
  62     fprintf(stderr, "inw: port=0x%04x\n", port);
  63     return 0;
  64 #else
  65     return address_space_lduw(&address_space_io, port,
  66                               cpu_get_mem_attrs(env), NULL);
  67 #endif
  68 }
  69
  70 void helper_outl(CPUX86State *env, uint32_t port, uint32_t data)
  71 {
  72 #ifdef CONFIG_USER_ONLY
  73     fprintf(stderr, "outw: port=0x%04x, data=%08x\n", port, data);
  74 #else
  75     address_space_stl(&address_space_io, port, data,
  76                       cpu_get_mem_attrs(env), NULL);
  77 #endif
  78 }
  79
  80 target_ulong helper_inl(CPUX86State *env, uint32_t port)
  81 {
  82 #ifdef CONFIG_USER_ONLY
  83     fprintf(stderr, "inl: port=0x%04x\n", port);
  84     return 0;
  85 #else
  86     return address_space_ldl(&address_space_io, port,
  87                              cpu_get_mem_attrs(env), NULL);
  88 #endif
  89 }
  90
  91 void helper_into(CPUX86State *env, int next_eip_addend)
  92 {
  93     int eflags;
  94
  95     eflags = cpu_cc_compute_all(env, CC_OP);
  96     if (eflags & CC_O) {
  97         raise_interrupt(env, EXCP04_INTO, 1, 0, next_eip_addend);
  98     }
  99 }
 100
 101 void helper_cpuid(CPUX86State *env)
 102 {
 103     uint32_t eax, ebx, ecx, edx;
 104
 105     cpu_svm_check_intercept_param(env, SVM_EXIT_CPUID, 0, GETPC());
 106
 107     cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX],
 108                   &eax, &ebx, &ecx, &edx);
 109     env->regs[R_EAX] = eax;
 110     env->regs[R_EBX] = ebx;
 111     env->regs[R_ECX] = ecx;
 112     env->regs[R_EDX] = edx;
 113 }
 114
 115 #if defined(CONFIG_USER_ONLY)
 116 target_ulong helper_read_crN(CPUX86State *env, int reg)
 117 {
 118     return 0;
 119 }
 120
 121 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 122 {
 123 }
 124 #else
 125 target_ulong helper_read_crN(CPUX86State *env, int reg)
 126 {
 127     target_ulong val;
 128
 129     cpu_svm_check_intercept_param(env, SVM_EXIT_READ_CR0 + reg, 0, GETPC());
 130     switch (reg) {
 131     default:
 132         val = env->cr[reg];
 133         break;
 134     case 8:
 135         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 136             val = cpu_get_apic_tpr(env_archcpu(env)->apic_state);
 137         } else {
 138             val = env->v_tpr;
 139         }
 140         break;
 141     }
 142     return val;
 143 }
 144
 145 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 146 {
 147     cpu_svm_check_intercept_param(env, SVM_EXIT_WRITE_CR0 + reg, 0, GETPC());
 148     switch (reg) {
 149     case 0:
 150         cpu_x86_update_cr0(env, t0);
 151         break;
 152     case 3:
 153         cpu_x86_update_cr3(env, t0);
 154         break;
 155     case 4:
 156         cpu_x86_update_cr4(env, t0);
 157         break;
 158     case 8:
 159         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 160             qemu_mutex_lock_iothread();
 161             cpu_set_apic_tpr(env_archcpu(env)->apic_state, t0);
 162             qemu_mutex_unlock_iothread();
 163         }
 164         env->v_tpr = t0 & 0x0f;
 165         break;
 166     default:
 167         env->cr[reg] = t0;
 168         break;
 169     }
 170 }
 171 #endif
 172
 173 void helper_lmsw(CPUX86State *env, target_ulong t0)
 174 {
 175     /* only 4 lower bits of CR0 are modified. PE cannot be set to zero
 176        if already set to one. */
 177     t0 = (env->cr[0] & ~0xe) | (t0 & 0xf);
 178     helper_write_crN(env, 0, t0);
 179 }
 180
 181 void helper_invlpg(CPUX86State *env, target_ulong addr)
 182 {
 183     X86CPU *cpu = env_archcpu(env);
 184
 185     cpu_svm_check_intercept_param(env, SVM_EXIT_INVLPG, 0, GETPC());
 186     tlb_flush_page(CPU(cpu), addr);
 187 }
 188
 189 void helper_rdtsc(CPUX86State *env)
 190 {
 191     uint64_t val;
 192
 193     if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 194         raise_exception_ra(env, EXCP0D_GPF, GETPC());
 195     }
 196     cpu_svm_check_intercept_param(env, SVM_EXIT_RDTSC, 0, GETPC());
 197
 198     val = cpu_get_tsc(env) + env->tsc_offset;
 199     env->regs[R_EAX] = (uint32_t)(val);
 200     env->regs[R_EDX] = (uint32_t)(val >> 32);
 201 }
 202
 203 void helper_rdtscp(CPUX86State *env)
 204 {
 205     helper_rdtsc(env);
 206     env->regs[R_ECX] = (uint32_t)(env->tsc_aux);
 207 }
 208
 209 void helper_rdpmc(CPUX86State *env)
 210 {
 211     if ((env->cr[4] & CR4_PCE_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 212         raise_exception_ra(env, EXCP0D_GPF, GETPC());
 213     }
 214     cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0, GETPC());
 215
 216     /* currently unimplemented */
 217     qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n");
 218     raise_exception_err(env, EXCP06_ILLOP, 0);
 219 }
 220
 221 #if defined(CONFIG_USER_ONLY)
 222 void helper_wrmsr(CPUX86State *env)
 223 {
 224 }
 225
 226 void helper_rdmsr(CPUX86State *env)
 227 {
 228 }
 229 #else
 230 void helper_wrmsr(CPUX86State *env)
 231 {
 232     uint64_t val;
 233
 234     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1, GETPC());
 235
 236     val = ((uint32_t)env->regs[R_EAX]) |
 237         ((uint64_t)((uint32_t)env->regs[R_EDX]) << 32);
 238
 239     switch ((uint32_t)env->regs[R_ECX]) {
 240     case MSR_IA32_SYSENTER_CS:
 241         env->sysenter_cs = val & 0xffff;
 242         break;
 243     case MSR_IA32_SYSENTER_ESP:
 244         env->sysenter_esp = val;
 245         break;
 246     case MSR_IA32_SYSENTER_EIP:
 247         env->sysenter_eip = val;
 248         break;
 249     case MSR_IA32_APICBASE:
 250         cpu_set_apic_base(env_archcpu(env)->apic_state, val);
 251         break;
 252     case MSR_EFER:
 253         {
 254             uint64_t update_mask;
 255
 256             update_mask = 0;
 257             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_SYSCALL) {
 258                 update_mask |= MSR_EFER_SCE;
 259             }
 260             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
 261                 update_mask |= MSR_EFER_LME;
 262             }
 263             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
 264                 update_mask |= MSR_EFER_FFXSR;
 265             }
 266             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_NX) {
 267                 update_mask |= MSR_EFER_NXE;
 268             }
 269             if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
 270                 update_mask |= MSR_EFER_SVME;
 271             }
 272             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
 273                 update_mask |= MSR_EFER_FFXSR;
 274             }
 275             cpu_load_efer(env, (env->efer & ~update_mask) |
 276                           (val & update_mask));
 277         }
 278         break;
 279     case MSR_STAR:
 280         env->star = val;
 281         break;
 282     case MSR_PAT:
 283         env->pat = val;
 284         break;
 285     case MSR_VM_HSAVE_PA:
 286         env->vm_hsave = val;
 287         break;
 288 #ifdef TARGET_X86_64
 289     case MSR_LSTAR:
 290         env->lstar = val;
 291         break;
 292     case MSR_CSTAR:
 293         env->cstar = val;
 294         break;
 295     case MSR_FMASK:
 296         env->fmask = val;
 297         break;
 298     case MSR_FSBASE:
 299         env->segs[R_FS].base = val;
 300         break;
 301     case MSR_GSBASE:
 302         env->segs[R_GS].base = val;
 303         break;
 304     case MSR_KERNELGSBASE:
 305         env->kernelgsbase = val;
 306         break;
 307 #endif
 308     case MSR_MTRRphysBase(0):
 309     case MSR_MTRRphysBase(1):
 310     case MSR_MTRRphysBase(2):
 311     case MSR_MTRRphysBase(3):
 312     case MSR_MTRRphysBase(4):
 313     case MSR_MTRRphysBase(5):
 314     case MSR_MTRRphysBase(6):
 315     case MSR_MTRRphysBase(7):
 316         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 317                        MSR_MTRRphysBase(0)) / 2].base = val;
 318         break;
 319     case MSR_MTRRphysMask(0):
 320     case MSR_MTRRphysMask(1):
 321     case MSR_MTRRphysMask(2):
 322     case MSR_MTRRphysMask(3):
 323     case MSR_MTRRphysMask(4):
 324     case MSR_MTRRphysMask(5):
 325     case MSR_MTRRphysMask(6):
 326     case MSR_MTRRphysMask(7):
 327         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 328                        MSR_MTRRphysMask(0)) / 2].mask = val;
 329         break;
 330     case MSR_MTRRfix64K_00000:
 331         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 332                         MSR_MTRRfix64K_00000] = val;
 333         break;
 334     case MSR_MTRRfix16K_80000:
 335     case MSR_MTRRfix16K_A0000:
 336         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 337                         MSR_MTRRfix16K_80000 + 1] = val;
 338         break;
 339     case MSR_MTRRfix4K_C0000:
 340     case MSR_MTRRfix4K_C8000:
 341     case MSR_MTRRfix4K_D0000:
 342     case MSR_MTRRfix4K_D8000:
 343     case MSR_MTRRfix4K_E0000:
 344     case MSR_MTRRfix4K_E8000:
 345     case MSR_MTRRfix4K_F0000:
 346     case MSR_MTRRfix4K_F8000:
 347         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 348                         MSR_MTRRfix4K_C0000 + 3] = val;
 349         break;
 350     case MSR_MTRRdefType:
 351         env->mtrr_deftype = val;
 352         break;
 353     case MSR_MCG_STATUS:
 354         env->mcg_status = val;
 355         break;
 356     case MSR_MCG_CTL:
 357         if ((env->mcg_cap & MCG_CTL_P)
 358             && (val == 0 || val == ~(uint64_t)0)) {
 359             env->mcg_ctl = val;
 360         }
 361         break;
 362     case MSR_TSC_AUX:
 363         env->tsc_aux = val;
 364         break;
 365     case MSR_IA32_MISC_ENABLE:
 366         env->msr_ia32_misc_enable = val;
 367         break;
 368     case MSR_IA32_BNDCFGS:
 369         /* FIXME: #GP if reserved bits are set.  */
 370         /* FIXME: Extend highest implemented bit of linear address.  */
 371         env->msr_bndcfgs = val;
 372         cpu_sync_bndcs_hflags(env);
 373         break;
 374     default:
 375         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
 376             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
 377             (4 * env->mcg_cap & 0xff)) {
 378             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
 379             if ((offset & 0x3) != 0
 380                 || (val == 0 || val == ~(uint64_t)0)) {
 381                 env->mce_banks[offset] = val;
 382             }
 383             break;
 384         }
 385         /* XXX: exception? */
 386         break;
 387     }
 388 }
 389
 390 void helper_rdmsr(CPUX86State *env)
 391 {
 392     X86CPU *x86_cpu = env_archcpu(env);
 393     uint64_t val;
 394
 395     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 0, GETPC());
 396
 397     switch ((uint32_t)env->regs[R_ECX]) {
 398     case MSR_IA32_SYSENTER_CS:
 399         val = env->sysenter_cs;
 400         break;
 401     case MSR_IA32_SYSENTER_ESP:
 402         val = env->sysenter_esp;
 403         break;
 404     case MSR_IA32_SYSENTER_EIP:
 405         val = env->sysenter_eip;
 406         break;
 407     case MSR_IA32_APICBASE:
 408         val = cpu_get_apic_base(env_archcpu(env)->apic_state);
 409         break;
 410     case MSR_EFER:
 411         val = env->efer;
 412         break;
 413     case MSR_STAR:
 414         val = env->star;
 415         break;
 416     case MSR_PAT:
 417         val = env->pat;
 418         break;
 419     case MSR_VM_HSAVE_PA:
 420         val = env->vm_hsave;
 421         break;
 422     case MSR_IA32_PERF_STATUS:
 423         /* tsc_increment_by_tick */
 424         val = 1000ULL;
 425         /* CPU multiplier */
 426         val |= (((uint64_t)4ULL) << 40);
 427         break;
 428 #ifdef TARGET_X86_64
 429     case MSR_LSTAR:
 430         val = env->lstar;
 431         break;
 432     case MSR_CSTAR:
 433         val = env->cstar;
 434         break;
 435     case MSR_FMASK:
 436         val = env->fmask;
 437         break;
 438     case MSR_FSBASE:
 439         val = env->segs[R_FS].base;
 440         break;
 441     case MSR_GSBASE:
 442         val = env->segs[R_GS].base;
 443         break;
 444     case MSR_KERNELGSBASE:
 445         val = env->kernelgsbase;
 446         break;
 447     case MSR_TSC_AUX:
 448         val = env->tsc_aux;
 449         break;
 450 #endif
 451     case MSR_SMI_COUNT:
 452         val = env->msr_smi_count;
 453         break;
 454     case MSR_MTRRphysBase(0):
 455     case MSR_MTRRphysBase(1):
 456     case MSR_MTRRphysBase(2):
 457     case MSR_MTRRphysBase(3):
 458     case MSR_MTRRphysBase(4):
 459     case MSR_MTRRphysBase(5):
 460     case MSR_MTRRphysBase(6):
 461     case MSR_MTRRphysBase(7):
 462         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 463                              MSR_MTRRphysBase(0)) / 2].base;
 464         break;
 465     case MSR_MTRRphysMask(0):
 466     case MSR_MTRRphysMask(1):
 467     case MSR_MTRRphysMask(2):
 468     case MSR_MTRRphysMask(3):
 469     case MSR_MTRRphysMask(4):
 470     case MSR_MTRRphysMask(5):
 471     case MSR_MTRRphysMask(6):
 472     case MSR_MTRRphysMask(7):
 473         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 474                              MSR_MTRRphysMask(0)) / 2].mask;
 475         break;
 476     case MSR_MTRRfix64K_00000:
 477         val = env->mtrr_fixed[0];
 478         break;
 479     case MSR_MTRRfix16K_80000:
 480     case MSR_MTRRfix16K_A0000:
 481         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 482                               MSR_MTRRfix16K_80000 + 1];
 483         break;
 484     case MSR_MTRRfix4K_C0000:
 485     case MSR_MTRRfix4K_C8000:
 486     case MSR_MTRRfix4K_D0000:
 487     case MSR_MTRRfix4K_D8000:
 488     case MSR_MTRRfix4K_E0000:
 489     case MSR_MTRRfix4K_E8000:
 490     case MSR_MTRRfix4K_F0000:
 491     case MSR_MTRRfix4K_F8000:
 492         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 493                               MSR_MTRRfix4K_C0000 + 3];
 494         break;
 495     case MSR_MTRRdefType:
 496         val = env->mtrr_deftype;
 497         break;
 498     case MSR_MTRRcap:
 499         if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
 500             val = MSR_MTRRcap_VCNT | MSR_MTRRcap_FIXRANGE_SUPPORT |
 501                 MSR_MTRRcap_WC_SUPPORTED;
 502         } else {
 503             /* XXX: exception? */
 504             val = 0;
 505         }
 506         break;
 507     case MSR_MCG_CAP:
 508         val = env->mcg_cap;
 509         break;
 510     case MSR_MCG_CTL:
 511         if (env->mcg_cap & MCG_CTL_P) {
 512             val = env->mcg_ctl;
 513         } else {
 514             val = 0;
 515         }
 516         break;
 517     case MSR_MCG_STATUS:
 518         val = env->mcg_status;
 519         break;
 520     case MSR_IA32_MISC_ENABLE:
 521         val = env->msr_ia32_misc_enable;
 522         break;
 523     case MSR_IA32_BNDCFGS:
 524         val = env->msr_bndcfgs;
 525         break;
 526      case MSR_IA32_UCODE_REV:
 527         val = x86_cpu->ucode_rev;
 528         break;
 529     default:
 530         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
 531             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
 532             (4 * env->mcg_cap & 0xff)) {
 533             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
 534             val = env->mce_banks[offset];
 535             break;
 536         }
 537         /* XXX: exception? */
 538         val = 0;
 539         break;
 540     }
 541     env->regs[R_EAX] = (uint32_t)(val);
 542     env->regs[R_EDX] = (uint32_t)(val >> 32);
 543 }
 544 #endif
 545
 546 static void do_pause(X86CPU *cpu)
 547 {
 548     CPUState *cs = CPU(cpu);
 549
 550     /* Just let another CPU run.  */
 551     cs->exception_index = EXCP_INTERRUPT;
 552     cpu_loop_exit(cs);
 553 }
 554
 555 static void do_hlt(X86CPU *cpu)
 556 {
 557     CPUState *cs = CPU(cpu);
 558     CPUX86State *env = &cpu->env;
 559
 560     env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
 561     cs->halted = 1;
 562     cs->exception_index = EXCP_HLT;
 563     cpu_loop_exit(cs);
 564 }
 565
 566 void helper_hlt(CPUX86State *env, int next_eip_addend)
 567 {
 568     X86CPU *cpu = env_archcpu(env);
 569
 570     cpu_svm_check_intercept_param(env, SVM_EXIT_HLT, 0, GETPC());
 571     env->eip += next_eip_addend;
 572
 573     do_hlt(cpu);
 574 }
 575
 576 void helper_monitor(CPUX86State *env, target_ulong ptr)
 577 {
 578     if ((uint32_t)env->regs[R_ECX] != 0) {
 579         raise_exception_ra(env, EXCP0D_GPF, GETPC());
 580     }
 581     /* XXX: store address? */
 582     cpu_svm_check_intercept_param(env, SVM_EXIT_MONITOR, 0, GETPC());
 583 }
 584
 585 void helper_mwait(CPUX86State *env, int next_eip_addend)
 586 {
 587     CPUState *cs = env_cpu(env);
 588     X86CPU *cpu = env_archcpu(env);
 589
 590     if ((uint32_t)env->regs[R_ECX] != 0) {
 591         raise_exception_ra(env, EXCP0D_GPF, GETPC());
 592     }
 593     cpu_svm_check_intercept_param(env, SVM_EXIT_MWAIT, 0, GETPC());
 594     env->eip += next_eip_addend;
 595
 596     /* XXX: not complete but not completely erroneous */
 597     if (cs->cpu_index != 0 || CPU_NEXT(cs) != NULL) {
 598         do_pause(cpu);
 599     } else {
 600         do_hlt(cpu);
 601     }
 602 }
 603
 604 void helper_pause(CPUX86State *env, int next_eip_addend)
 605 {
 606     X86CPU *cpu = env_archcpu(env);
 607
 608     cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0, GETPC());
 609     env->eip += next_eip_addend;
 610
 611     do_pause(cpu);
 612 }
 613
 614 void helper_debug(CPUX86State *env)
 615 {
 616     CPUState *cs = env_cpu(env);
 617
 618     cs->exception_index = EXCP_DEBUG;
 619     cpu_loop_exit(cs);
 620 }
 621
 622 uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx)
 623 {
 624     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
 625         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
 626     }
 627     if (ecx != 0) {
 628         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
 629     }
 630
 631     return env->pkru;
 632 }
 633
 634 void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val)
 635 {
 636     CPUState *cs = env_cpu(env);
 637
 638     if ((env->cr[4] & CR4_PKE_MASK) == 0) {
 639         raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
 640     }
 641     if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) {
 642         raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
 643     }
 644
 645     env->pkru = val;
 646     tlb_flush(cs);
 647 }