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 "cpu.h"
  21 #include "exec/ioport.h"
  22 #include "helper.h"
  23
  24 #if !defined(CONFIG_USER_ONLY)
  25 #include "exec/softmmu_exec.h"
  26 #endif /* !defined(CONFIG_USER_ONLY) */
  27
  28 /* check if Port I/O is allowed in TSS */
  29 static inline void check_io(CPUX86State *env, int addr, int size)
  30 {
  31     int io_offset, val, mask;
  32
  33     /* TSS must be a valid 32 bit one */
  34     if (!(env->tr.flags & DESC_P_MASK) ||
  35         ((env->tr.flags >> DESC_TYPE_SHIFT) & 0xf) != 9 ||
  36         env->tr.limit < 103) {
  37         goto fail;
  38     }
  39     io_offset = cpu_lduw_kernel(env, env->tr.base + 0x66);
  40     io_offset += (addr >> 3);
  41     /* Note: the check needs two bytes */
  42     if ((io_offset + 1) > env->tr.limit) {
  43         goto fail;
  44     }
  45     val = cpu_lduw_kernel(env, env->tr.base + io_offset);
  46     val >>= (addr & 7);
  47     mask = (1 << size) - 1;
  48     /* all bits must be zero to allow the I/O */
  49     if ((val & mask) != 0) {
  50     fail:
  51         raise_exception_err(env, EXCP0D_GPF, 0);
  52     }
  53 }
  54
  55 void helper_check_iob(CPUX86State *env, uint32_t t0)
  56 {
  57     check_io(env, t0, 1);
  58 }
  59
  60 void helper_check_iow(CPUX86State *env, uint32_t t0)
  61 {
  62     check_io(env, t0, 2);
  63 }
  64
  65 void helper_check_iol(CPUX86State *env, uint32_t t0)
  66 {
  67     check_io(env, t0, 4);
  68 }
  69
  70 void helper_outb(uint32_t port, uint32_t data)
  71 {
  72     cpu_outb(port, data & 0xff);
  73 }
  74
  75 target_ulong helper_inb(uint32_t port)
  76 {
  77     return cpu_inb(port);
  78 }
  79
  80 void helper_outw(uint32_t port, uint32_t data)
  81 {
  82     cpu_outw(port, data & 0xffff);
  83 }
  84
  85 target_ulong helper_inw(uint32_t port)
  86 {
  87     return cpu_inw(port);
  88 }
  89
  90 void helper_outl(uint32_t port, uint32_t data)
  91 {
  92     cpu_outl(port, data);
  93 }
  94
  95 target_ulong helper_inl(uint32_t port)
  96 {
  97     return cpu_inl(port);
  98 }
  99
 100 void helper_into(CPUX86State *env, int next_eip_addend)
 101 {
 102     int eflags;
 103
 104     eflags = cpu_cc_compute_all(env, CC_OP);
 105     if (eflags & CC_O) {
 106         raise_interrupt(env, EXCP04_INTO, 1, 0, next_eip_addend);
 107     }
 108 }
 109
 110 void helper_single_step(CPUX86State *env)
 111 {
 112 #ifndef CONFIG_USER_ONLY
 113     check_hw_breakpoints(env, true);
 114     env->dr[6] |= DR6_BS;
 115 #endif
 116     raise_exception(env, EXCP01_DB);
 117 }
 118
 119 void helper_cpuid(CPUX86State *env)
 120 {
 121     uint32_t eax, ebx, ecx, edx;
 122
 123     cpu_svm_check_intercept_param(env, SVM_EXIT_CPUID, 0);
 124
 125     cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX],
 126                   &eax, &ebx, &ecx, &edx);
 127     env->regs[R_EAX] = eax;
 128     env->regs[R_EBX] = ebx;
 129     env->regs[R_ECX] = ecx;
 130     env->regs[R_EDX] = edx;
 131 }
 132
 133 #if defined(CONFIG_USER_ONLY)
 134 target_ulong helper_read_crN(CPUX86State *env, int reg)
 135 {
 136     return 0;
 137 }
 138
 139 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 140 {
 141 }
 142
 143 void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
 144 {
 145 }
 146 #else
 147 target_ulong helper_read_crN(CPUX86State *env, int reg)
 148 {
 149     target_ulong val;
 150
 151     cpu_svm_check_intercept_param(env, SVM_EXIT_READ_CR0 + reg, 0);
 152     switch (reg) {
 153     default:
 154         val = env->cr[reg];
 155         break;
 156     case 8:
 157         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 158             val = cpu_get_apic_tpr(x86_env_get_cpu(env)->apic_state);
 159         } else {
 160             val = env->v_tpr;
 161         }
 162         break;
 163     }
 164     return val;
 165 }
 166
 167 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 168 {
 169     cpu_svm_check_intercept_param(env, SVM_EXIT_WRITE_CR0 + reg, 0);
 170     switch (reg) {
 171     case 0:
 172         cpu_x86_update_cr0(env, t0);
 173         break;
 174     case 3:
 175         cpu_x86_update_cr3(env, t0);
 176         break;
 177     case 4:
 178         cpu_x86_update_cr4(env, t0);
 179         break;
 180     case 8:
 181         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 182             cpu_set_apic_tpr(x86_env_get_cpu(env)->apic_state, t0);
 183         }
 184         env->v_tpr = t0 & 0x0f;
 185         break;
 186     default:
 187         env->cr[reg] = t0;
 188         break;
 189     }
 190 }
 191
 192 void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
 193 {
 194     int i;
 195
 196     if (reg < 4) {
 197         hw_breakpoint_remove(env, reg);
 198         env->dr[reg] = t0;
 199         hw_breakpoint_insert(env, reg);
 200     } else if (reg == 7) {
 201         for (i = 0; i < DR7_MAX_BP; i++) {
 202             hw_breakpoint_remove(env, i);
 203         }
 204         env->dr[7] = t0;
 205         for (i = 0; i < DR7_MAX_BP; i++) {
 206             hw_breakpoint_insert(env, i);
 207         }
 208     } else {
 209         env->dr[reg] = t0;
 210     }
 211 }
 212 #endif
 213
 214 void helper_lmsw(CPUX86State *env, target_ulong t0)
 215 {
 216     /* only 4 lower bits of CR0 are modified. PE cannot be set to zero
 217        if already set to one. */
 218     t0 = (env->cr[0] & ~0xe) | (t0 & 0xf);
 219     helper_write_crN(env, 0, t0);
 220 }
 221
 222 void helper_invlpg(CPUX86State *env, target_ulong addr)
 223 {
 224     cpu_svm_check_intercept_param(env, SVM_EXIT_INVLPG, 0);
 225     tlb_flush_page(env, addr);
 226 }
 227
 228 void helper_rdtsc(CPUX86State *env)
 229 {
 230     uint64_t val;
 231
 232     if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 233         raise_exception(env, EXCP0D_GPF);
 234     }
 235     cpu_svm_check_intercept_param(env, SVM_EXIT_RDTSC, 0);
 236
 237     val = cpu_get_tsc(env) + env->tsc_offset;
 238     env->regs[R_EAX] = (uint32_t)(val);
 239     env->regs[R_EDX] = (uint32_t)(val >> 32);
 240 }
 241
 242 void helper_rdtscp(CPUX86State *env)
 243 {
 244     helper_rdtsc(env);
 245     env->regs[R_ECX] = (uint32_t)(env->tsc_aux);
 246 }
 247
 248 void helper_rdpmc(CPUX86State *env)
 249 {
 250     if ((env->cr[4] & CR4_PCE_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 251         raise_exception(env, EXCP0D_GPF);
 252     }
 253     cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0);
 254
 255     /* currently unimplemented */
 256     qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n");
 257     raise_exception_err(env, EXCP06_ILLOP, 0);
 258 }
 259
 260 #if defined(CONFIG_USER_ONLY)
 261 void helper_wrmsr(CPUX86State *env)
 262 {
 263 }
 264
 265 void helper_rdmsr(CPUX86State *env)
 266 {
 267 }
 268 #else
 269 void helper_wrmsr(CPUX86State *env)
 270 {
 271     uint64_t val;
 272
 273     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1);
 274
 275     val = ((uint32_t)env->regs[R_EAX]) |
 276         ((uint64_t)((uint32_t)env->regs[R_EDX]) << 32);
 277
 278     switch ((uint32_t)env->regs[R_ECX]) {
 279     case MSR_IA32_SYSENTER_CS:
 280         env->sysenter_cs = val & 0xffff;
 281         break;
 282     case MSR_IA32_SYSENTER_ESP:
 283         env->sysenter_esp = val;
 284         break;
 285     case MSR_IA32_SYSENTER_EIP:
 286         env->sysenter_eip = val;
 287         break;
 288     case MSR_IA32_APICBASE:
 289         cpu_set_apic_base(x86_env_get_cpu(env)->apic_state, val);
 290         break;
 291     case MSR_EFER:
 292         {
 293             uint64_t update_mask;
 294
 295             update_mask = 0;
 296             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_SYSCALL) {
 297                 update_mask |= MSR_EFER_SCE;
 298             }
 299             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
 300                 update_mask |= MSR_EFER_LME;
 301             }
 302             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
 303                 update_mask |= MSR_EFER_FFXSR;
 304             }
 305             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_NX) {
 306                 update_mask |= MSR_EFER_NXE;
 307             }
 308             if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
 309                 update_mask |= MSR_EFER_SVME;
 310             }
 311             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
 312                 update_mask |= MSR_EFER_FFXSR;
 313             }
 314             cpu_load_efer(env, (env->efer & ~update_mask) |
 315                           (val & update_mask));
 316         }
 317         break;
 318     case MSR_STAR:
 319         env->star = val;
 320         break;
 321     case MSR_PAT:
 322         env->pat = val;
 323         break;
 324     case MSR_VM_HSAVE_PA:
 325         env->vm_hsave = val;
 326         break;
 327 #ifdef TARGET_X86_64
 328     case MSR_LSTAR:
 329         env->lstar = val;
 330         break;
 331     case MSR_CSTAR:
 332         env->cstar = val;
 333         break;
 334     case MSR_FMASK:
 335         env->fmask = val;
 336         break;
 337     case MSR_FSBASE:
 338         env->segs[R_FS].base = val;
 339         break;
 340     case MSR_GSBASE:
 341         env->segs[R_GS].base = val;
 342         break;
 343     case MSR_KERNELGSBASE:
 344         env->kernelgsbase = val;
 345         break;
 346 #endif
 347     case MSR_MTRRphysBase(0):
 348     case MSR_MTRRphysBase(1):
 349     case MSR_MTRRphysBase(2):
 350     case MSR_MTRRphysBase(3):
 351     case MSR_MTRRphysBase(4):
 352     case MSR_MTRRphysBase(5):
 353     case MSR_MTRRphysBase(6):
 354     case MSR_MTRRphysBase(7):
 355         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 356                        MSR_MTRRphysBase(0)) / 2].base = val;
 357         break;
 358     case MSR_MTRRphysMask(0):
 359     case MSR_MTRRphysMask(1):
 360     case MSR_MTRRphysMask(2):
 361     case MSR_MTRRphysMask(3):
 362     case MSR_MTRRphysMask(4):
 363     case MSR_MTRRphysMask(5):
 364     case MSR_MTRRphysMask(6):
 365     case MSR_MTRRphysMask(7):
 366         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 367                        MSR_MTRRphysMask(0)) / 2].mask = val;
 368         break;
 369     case MSR_MTRRfix64K_00000:
 370         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 371                         MSR_MTRRfix64K_00000] = val;
 372         break;
 373     case MSR_MTRRfix16K_80000:
 374     case MSR_MTRRfix16K_A0000:
 375         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 376                         MSR_MTRRfix16K_80000 + 1] = val;
 377         break;
 378     case MSR_MTRRfix4K_C0000:
 379     case MSR_MTRRfix4K_C8000:
 380     case MSR_MTRRfix4K_D0000:
 381     case MSR_MTRRfix4K_D8000:
 382     case MSR_MTRRfix4K_E0000:
 383     case MSR_MTRRfix4K_E8000:
 384     case MSR_MTRRfix4K_F0000:
 385     case MSR_MTRRfix4K_F8000:
 386         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 387                         MSR_MTRRfix4K_C0000 + 3] = val;
 388         break;
 389     case MSR_MTRRdefType:
 390         env->mtrr_deftype = val;
 391         break;
 392     case MSR_MCG_STATUS:
 393         env->mcg_status = val;
 394         break;
 395     case MSR_MCG_CTL:
 396         if ((env->mcg_cap & MCG_CTL_P)
 397             && (val == 0 || val == ~(uint64_t)0)) {
 398             env->mcg_ctl = val;
 399         }
 400         break;
 401     case MSR_TSC_AUX:
 402         env->tsc_aux = val;
 403         break;
 404     case MSR_IA32_MISC_ENABLE:
 405         env->msr_ia32_misc_enable = val;
 406         break;
 407     default:
 408         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
 409             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
 410             (4 * env->mcg_cap & 0xff)) {
 411             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
 412             if ((offset & 0x3) != 0
 413                 || (val == 0 || val == ~(uint64_t)0)) {
 414                 env->mce_banks[offset] = val;
 415             }
 416             break;
 417         }
 418         /* XXX: exception? */
 419         break;
 420     }
 421 }
 422
 423 void helper_rdmsr(CPUX86State *env)
 424 {
 425     uint64_t val;
 426
 427     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 0);
 428
 429     switch ((uint32_t)env->regs[R_ECX]) {
 430     case MSR_IA32_SYSENTER_CS:
 431         val = env->sysenter_cs;
 432         break;
 433     case MSR_IA32_SYSENTER_ESP:
 434         val = env->sysenter_esp;
 435         break;
 436     case MSR_IA32_SYSENTER_EIP:
 437         val = env->sysenter_eip;
 438         break;
 439     case MSR_IA32_APICBASE:
 440         val = cpu_get_apic_base(x86_env_get_cpu(env)->apic_state);
 441         break;
 442     case MSR_EFER:
 443         val = env->efer;
 444         break;
 445     case MSR_STAR:
 446         val = env->star;
 447         break;
 448     case MSR_PAT:
 449         val = env->pat;
 450         break;
 451     case MSR_VM_HSAVE_PA:
 452         val = env->vm_hsave;
 453         break;
 454     case MSR_IA32_PERF_STATUS:
 455         /* tsc_increment_by_tick */
 456         val = 1000ULL;
 457         /* CPU multiplier */
 458         val |= (((uint64_t)4ULL) << 40);
 459         break;
 460 #ifdef TARGET_X86_64
 461     case MSR_LSTAR:
 462         val = env->lstar;
 463         break;
 464     case MSR_CSTAR:
 465         val = env->cstar;
 466         break;
 467     case MSR_FMASK:
 468         val = env->fmask;
 469         break;
 470     case MSR_FSBASE:
 471         val = env->segs[R_FS].base;
 472         break;
 473     case MSR_GSBASE:
 474         val = env->segs[R_GS].base;
 475         break;
 476     case MSR_KERNELGSBASE:
 477         val = env->kernelgsbase;
 478         break;
 479     case MSR_TSC_AUX:
 480         val = env->tsc_aux;
 481         break;
 482 #endif
 483     case MSR_MTRRphysBase(0):
 484     case MSR_MTRRphysBase(1):
 485     case MSR_MTRRphysBase(2):
 486     case MSR_MTRRphysBase(3):
 487     case MSR_MTRRphysBase(4):
 488     case MSR_MTRRphysBase(5):
 489     case MSR_MTRRphysBase(6):
 490     case MSR_MTRRphysBase(7):
 491         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 492                              MSR_MTRRphysBase(0)) / 2].base;
 493         break;
 494     case MSR_MTRRphysMask(0):
 495     case MSR_MTRRphysMask(1):
 496     case MSR_MTRRphysMask(2):
 497     case MSR_MTRRphysMask(3):
 498     case MSR_MTRRphysMask(4):
 499     case MSR_MTRRphysMask(5):
 500     case MSR_MTRRphysMask(6):
 501     case MSR_MTRRphysMask(7):
 502         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
 503                              MSR_MTRRphysMask(0)) / 2].mask;
 504         break;
 505     case MSR_MTRRfix64K_00000:
 506         val = env->mtrr_fixed[0];
 507         break;
 508     case MSR_MTRRfix16K_80000:
 509     case MSR_MTRRfix16K_A0000:
 510         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 511                               MSR_MTRRfix16K_80000 + 1];
 512         break;
 513     case MSR_MTRRfix4K_C0000:
 514     case MSR_MTRRfix4K_C8000:
 515     case MSR_MTRRfix4K_D0000:
 516     case MSR_MTRRfix4K_D8000:
 517     case MSR_MTRRfix4K_E0000:
 518     case MSR_MTRRfix4K_E8000:
 519     case MSR_MTRRfix4K_F0000:
 520     case MSR_MTRRfix4K_F8000:
 521         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
 522                               MSR_MTRRfix4K_C0000 + 3];
 523         break;
 524     case MSR_MTRRdefType:
 525         val = env->mtrr_deftype;
 526         break;
 527     case MSR_MTRRcap:
 528         if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
 529             val = MSR_MTRRcap_VCNT | MSR_MTRRcap_FIXRANGE_SUPPORT |
 530                 MSR_MTRRcap_WC_SUPPORTED;
 531         } else {
 532             /* XXX: exception? */
 533             val = 0;
 534         }
 535         break;
 536     case MSR_MCG_CAP:
 537         val = env->mcg_cap;
 538         break;
 539     case MSR_MCG_CTL:
 540         if (env->mcg_cap & MCG_CTL_P) {
 541             val = env->mcg_ctl;
 542         } else {
 543             val = 0;
 544         }
 545         break;
 546     case MSR_MCG_STATUS:
 547         val = env->mcg_status;
 548         break;
 549     case MSR_IA32_MISC_ENABLE:
 550         val = env->msr_ia32_misc_enable;
 551         break;
 552     default:
 553         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
 554             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
 555             (4 * env->mcg_cap & 0xff)) {
 556             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
 557             val = env->mce_banks[offset];
 558             break;
 559         }
 560         /* XXX: exception? */
 561         val = 0;
 562         break;
 563     }
 564     env->regs[R_EAX] = (uint32_t)(val);
 565     env->regs[R_EDX] = (uint32_t)(val >> 32);
 566 }
 567 #endif
 568
 569 static void do_pause(X86CPU *cpu)
 570 {
 571     CPUX86State *env = &cpu->env;
 572
 573     /* Just let another CPU run.  */
 574     env->exception_index = EXCP_INTERRUPT;
 575     cpu_loop_exit(env);
 576 }
 577
 578 static void do_hlt(X86CPU *cpu)
 579 {
 580     CPUState *cs = CPU(cpu);
 581     CPUX86State *env = &cpu->env;
 582
 583     env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
 584     cs->halted = 1;
 585     env->exception_index = EXCP_HLT;
 586     cpu_loop_exit(env);
 587 }
 588
 589 void helper_hlt(CPUX86State *env, int next_eip_addend)
 590 {
 591     X86CPU *cpu = x86_env_get_cpu(env);
 592
 593     cpu_svm_check_intercept_param(env, SVM_EXIT_HLT, 0);
 594     env->eip += next_eip_addend;
 595
 596     do_hlt(cpu);
 597 }
 598
 599 void helper_monitor(CPUX86State *env, target_ulong ptr)
 600 {
 601     if ((uint32_t)env->regs[R_ECX] != 0) {
 602         raise_exception(env, EXCP0D_GPF);
 603     }
 604     /* XXX: store address? */
 605     cpu_svm_check_intercept_param(env, SVM_EXIT_MONITOR, 0);
 606 }
 607
 608 void helper_mwait(CPUX86State *env, int next_eip_addend)
 609 {
 610     CPUState *cs;
 611     X86CPU *cpu;
 612
 613     if ((uint32_t)env->regs[R_ECX] != 0) {
 614         raise_exception(env, EXCP0D_GPF);
 615     }
 616     cpu_svm_check_intercept_param(env, SVM_EXIT_MWAIT, 0);
 617     env->eip += next_eip_addend;
 618
 619     cpu = x86_env_get_cpu(env);
 620     cs = CPU(cpu);
 621     /* XXX: not complete but not completely erroneous */
 622     if (cs->cpu_index != 0 || CPU_NEXT(cs) != NULL) {
 623         do_pause(cpu);
 624     } else {
 625         do_hlt(cpu);
 626     }
 627 }
 628
 629 void helper_pause(CPUX86State *env, int next_eip_addend)
 630 {
 631     X86CPU *cpu = x86_env_get_cpu(env);
 632
 633     cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0);
 634     env->eip += next_eip_addend;
 635
 636     do_pause(cpu);
 637 }
 638
 639 void helper_debug(CPUX86State *env)
 640 {
 641     env->exception_index = EXCP_DEBUG;
 642     cpu_loop_exit(env);
 643 }