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)EAX, (uint32_t)ECX, &eax, &ebx, &ecx, &edx);
 126     EAX = eax;
 127     EBX = ebx;
 128     ECX = ecx;
 129     EDX = edx;
 130 }
 131
 132 #if defined(CONFIG_USER_ONLY)
 133 target_ulong helper_read_crN(CPUX86State *env, int reg)
 134 {
 135     return 0;
 136 }
 137
 138 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 139 {
 140 }
 141
 142 void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
 143 {
 144 }
 145 #else
 146 target_ulong helper_read_crN(CPUX86State *env, int reg)
 147 {
 148     target_ulong val;
 149
 150     cpu_svm_check_intercept_param(env, SVM_EXIT_READ_CR0 + reg, 0);
 151     switch (reg) {
 152     default:
 153         val = env->cr[reg];
 154         break;
 155     case 8:
 156         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 157             val = cpu_get_apic_tpr(env->apic_state);
 158         } else {
 159             val = env->v_tpr;
 160         }
 161         break;
 162     }
 163     return val;
 164 }
 165
 166 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
 167 {
 168     cpu_svm_check_intercept_param(env, SVM_EXIT_WRITE_CR0 + reg, 0);
 169     switch (reg) {
 170     case 0:
 171         cpu_x86_update_cr0(env, t0);
 172         break;
 173     case 3:
 174         cpu_x86_update_cr3(env, t0);
 175         break;
 176     case 4:
 177         cpu_x86_update_cr4(env, t0);
 178         break;
 179     case 8:
 180         if (!(env->hflags2 & HF2_VINTR_MASK)) {
 181             cpu_set_apic_tpr(env->apic_state, t0);
 182         }
 183         env->v_tpr = t0 & 0x0f;
 184         break;
 185     default:
 186         env->cr[reg] = t0;
 187         break;
 188     }
 189 }
 190
 191 void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
 192 {
 193     int i;
 194
 195     if (reg < 4) {
 196         hw_breakpoint_remove(env, reg);
 197         env->dr[reg] = t0;
 198         hw_breakpoint_insert(env, reg);
 199     } else if (reg == 7) {
 200         for (i = 0; i < DR7_MAX_BP; i++) {
 201             hw_breakpoint_remove(env, i);
 202         }
 203         env->dr[7] = t0;
 204         for (i = 0; i < DR7_MAX_BP; i++) {
 205             hw_breakpoint_insert(env, i);
 206         }
 207     } else {
 208         env->dr[reg] = t0;
 209     }
 210 }
 211 #endif
 212
 213 void helper_lmsw(CPUX86State *env, target_ulong t0)
 214 {
 215     /* only 4 lower bits of CR0 are modified. PE cannot be set to zero
 216        if already set to one. */
 217     t0 = (env->cr[0] & ~0xe) | (t0 & 0xf);
 218     helper_write_crN(env, 0, t0);
 219 }
 220
 221 void helper_invlpg(CPUX86State *env, target_ulong addr)
 222 {
 223     cpu_svm_check_intercept_param(env, SVM_EXIT_INVLPG, 0);
 224     tlb_flush_page(env, addr);
 225 }
 226
 227 void helper_rdtsc(CPUX86State *env)
 228 {
 229     uint64_t val;
 230
 231     if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 232         raise_exception(env, EXCP0D_GPF);
 233     }
 234     cpu_svm_check_intercept_param(env, SVM_EXIT_RDTSC, 0);
 235
 236     val = cpu_get_tsc(env) + env->tsc_offset;
 237     EAX = (uint32_t)(val);
 238     EDX = (uint32_t)(val >> 32);
 239 }
 240
 241 void helper_rdtscp(CPUX86State *env)
 242 {
 243     helper_rdtsc(env);
 244     ECX = (uint32_t)(env->tsc_aux);
 245 }
 246
 247 void helper_rdpmc(CPUX86State *env)
 248 {
 249     if ((env->cr[4] & CR4_PCE_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
 250         raise_exception(env, EXCP0D_GPF);
 251     }
 252     cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0);
 253
 254     /* currently unimplemented */
 255     qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n");
 256     raise_exception_err(env, EXCP06_ILLOP, 0);
 257 }
 258
 259 #if defined(CONFIG_USER_ONLY)
 260 void helper_wrmsr(CPUX86State *env)
 261 {
 262 }
 263
 264 void helper_rdmsr(CPUX86State *env)
 265 {
 266 }
 267 #else
 268 void helper_wrmsr(CPUX86State *env)
 269 {
 270     uint64_t val;
 271
 272     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1);
 273
 274     val = ((uint32_t)EAX) | ((uint64_t)((uint32_t)EDX) << 32);
 275
 276     switch ((uint32_t)ECX) {
 277     case MSR_IA32_SYSENTER_CS:
 278         env->sysenter_cs = val & 0xffff;
 279         break;
 280     case MSR_IA32_SYSENTER_ESP:
 281         env->sysenter_esp = val;
 282         break;
 283     case MSR_IA32_SYSENTER_EIP:
 284         env->sysenter_eip = val;
 285         break;
 286     case MSR_IA32_APICBASE:
 287         cpu_set_apic_base(env->apic_state, val);
 288         break;
 289     case MSR_EFER:
 290         {
 291             uint64_t update_mask;
 292
 293             update_mask = 0;
 294             if (env->cpuid_ext2_features & CPUID_EXT2_SYSCALL) {
 295                 update_mask |= MSR_EFER_SCE;
 296             }
 297             if (env->cpuid_ext2_features & CPUID_EXT2_LM) {
 298                 update_mask |= MSR_EFER_LME;
 299             }
 300             if (env->cpuid_ext2_features & CPUID_EXT2_FFXSR) {
 301                 update_mask |= MSR_EFER_FFXSR;
 302             }
 303             if (env->cpuid_ext2_features & CPUID_EXT2_NX) {
 304                 update_mask |= MSR_EFER_NXE;
 305             }
 306             if (env->cpuid_ext3_features & CPUID_EXT3_SVM) {
 307                 update_mask |= MSR_EFER_SVME;
 308             }
 309             if (env->cpuid_ext2_features & CPUID_EXT2_FFXSR) {
 310                 update_mask |= MSR_EFER_FFXSR;
 311             }
 312             cpu_load_efer(env, (env->efer & ~update_mask) |
 313                           (val & update_mask));
 314         }
 315         break;
 316     case MSR_STAR:
 317         env->star = val;
 318         break;
 319     case MSR_PAT:
 320         env->pat = val;
 321         break;
 322     case MSR_VM_HSAVE_PA:
 323         env->vm_hsave = val;
 324         break;
 325 #ifdef TARGET_X86_64
 326     case MSR_LSTAR:
 327         env->lstar = val;
 328         break;
 329     case MSR_CSTAR:
 330         env->cstar = val;
 331         break;
 332     case MSR_FMASK:
 333         env->fmask = val;
 334         break;
 335     case MSR_FSBASE:
 336         env->segs[R_FS].base = val;
 337         break;
 338     case MSR_GSBASE:
 339         env->segs[R_GS].base = val;
 340         break;
 341     case MSR_KERNELGSBASE:
 342         env->kernelgsbase = val;
 343         break;
 344 #endif
 345     case MSR_MTRRphysBase(0):
 346     case MSR_MTRRphysBase(1):
 347     case MSR_MTRRphysBase(2):
 348     case MSR_MTRRphysBase(3):
 349     case MSR_MTRRphysBase(4):
 350     case MSR_MTRRphysBase(5):
 351     case MSR_MTRRphysBase(6):
 352     case MSR_MTRRphysBase(7):
 353         env->mtrr_var[((uint32_t)ECX - MSR_MTRRphysBase(0)) / 2].base = val;
 354         break;
 355     case MSR_MTRRphysMask(0):
 356     case MSR_MTRRphysMask(1):
 357     case MSR_MTRRphysMask(2):
 358     case MSR_MTRRphysMask(3):
 359     case MSR_MTRRphysMask(4):
 360     case MSR_MTRRphysMask(5):
 361     case MSR_MTRRphysMask(6):
 362     case MSR_MTRRphysMask(7):
 363         env->mtrr_var[((uint32_t)ECX - MSR_MTRRphysMask(0)) / 2].mask = val;
 364         break;
 365     case MSR_MTRRfix64K_00000:
 366         env->mtrr_fixed[(uint32_t)ECX - MSR_MTRRfix64K_00000] = val;
 367         break;
 368     case MSR_MTRRfix16K_80000:
 369     case MSR_MTRRfix16K_A0000:
 370         env->mtrr_fixed[(uint32_t)ECX - MSR_MTRRfix16K_80000 + 1] = val;
 371         break;
 372     case MSR_MTRRfix4K_C0000:
 373     case MSR_MTRRfix4K_C8000:
 374     case MSR_MTRRfix4K_D0000:
 375     case MSR_MTRRfix4K_D8000:
 376     case MSR_MTRRfix4K_E0000:
 377     case MSR_MTRRfix4K_E8000:
 378     case MSR_MTRRfix4K_F0000:
 379     case MSR_MTRRfix4K_F8000:
 380         env->mtrr_fixed[(uint32_t)ECX - MSR_MTRRfix4K_C0000 + 3] = val;
 381         break;
 382     case MSR_MTRRdefType:
 383         env->mtrr_deftype = val;
 384         break;
 385     case MSR_MCG_STATUS:
 386         env->mcg_status = val;
 387         break;
 388     case MSR_MCG_CTL:
 389         if ((env->mcg_cap & MCG_CTL_P)
 390             && (val == 0 || val == ~(uint64_t)0)) {
 391             env->mcg_ctl = val;
 392         }
 393         break;
 394     case MSR_TSC_AUX:
 395         env->tsc_aux = val;
 396         break;
 397     case MSR_IA32_MISC_ENABLE:
 398         env->msr_ia32_misc_enable = val;
 399         break;
 400     default:
 401         if ((uint32_t)ECX >= MSR_MC0_CTL
 402             && (uint32_t)ECX < MSR_MC0_CTL + (4 * env->mcg_cap & 0xff)) {
 403             uint32_t offset = (uint32_t)ECX - MSR_MC0_CTL;
 404             if ((offset & 0x3) != 0
 405                 || (val == 0 || val == ~(uint64_t)0)) {
 406                 env->mce_banks[offset] = val;
 407             }
 408             break;
 409         }
 410         /* XXX: exception? */
 411         break;
 412     }
 413 }
 414
 415 void helper_rdmsr(CPUX86State *env)
 416 {
 417     uint64_t val;
 418
 419     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 0);
 420
 421     switch ((uint32_t)ECX) {
 422     case MSR_IA32_SYSENTER_CS:
 423         val = env->sysenter_cs;
 424         break;
 425     case MSR_IA32_SYSENTER_ESP:
 426         val = env->sysenter_esp;
 427         break;
 428     case MSR_IA32_SYSENTER_EIP:
 429         val = env->sysenter_eip;
 430         break;
 431     case MSR_IA32_APICBASE:
 432         val = cpu_get_apic_base(env->apic_state);
 433         break;
 434     case MSR_EFER:
 435         val = env->efer;
 436         break;
 437     case MSR_STAR:
 438         val = env->star;
 439         break;
 440     case MSR_PAT:
 441         val = env->pat;
 442         break;
 443     case MSR_VM_HSAVE_PA:
 444         val = env->vm_hsave;
 445         break;
 446     case MSR_IA32_PERF_STATUS:
 447         /* tsc_increment_by_tick */
 448         val = 1000ULL;
 449         /* CPU multiplier */
 450         val |= (((uint64_t)4ULL) << 40);
 451         break;
 452 #ifdef TARGET_X86_64
 453     case MSR_LSTAR:
 454         val = env->lstar;
 455         break;
 456     case MSR_CSTAR:
 457         val = env->cstar;
 458         break;
 459     case MSR_FMASK:
 460         val = env->fmask;
 461         break;
 462     case MSR_FSBASE:
 463         val = env->segs[R_FS].base;
 464         break;
 465     case MSR_GSBASE:
 466         val = env->segs[R_GS].base;
 467         break;
 468     case MSR_KERNELGSBASE:
 469         val = env->kernelgsbase;
 470         break;
 471     case MSR_TSC_AUX:
 472         val = env->tsc_aux;
 473         break;
 474 #endif
 475     case MSR_MTRRphysBase(0):
 476     case MSR_MTRRphysBase(1):
 477     case MSR_MTRRphysBase(2):
 478     case MSR_MTRRphysBase(3):
 479     case MSR_MTRRphysBase(4):
 480     case MSR_MTRRphysBase(5):
 481     case MSR_MTRRphysBase(6):
 482     case MSR_MTRRphysBase(7):
 483         val = env->mtrr_var[((uint32_t)ECX - MSR_MTRRphysBase(0)) / 2].base;
 484         break;
 485     case MSR_MTRRphysMask(0):
 486     case MSR_MTRRphysMask(1):
 487     case MSR_MTRRphysMask(2):
 488     case MSR_MTRRphysMask(3):
 489     case MSR_MTRRphysMask(4):
 490     case MSR_MTRRphysMask(5):
 491     case MSR_MTRRphysMask(6):
 492     case MSR_MTRRphysMask(7):
 493         val = env->mtrr_var[((uint32_t)ECX - MSR_MTRRphysMask(0)) / 2].mask;
 494         break;
 495     case MSR_MTRRfix64K_00000:
 496         val = env->mtrr_fixed[0];
 497         break;
 498     case MSR_MTRRfix16K_80000:
 499     case MSR_MTRRfix16K_A0000:
 500         val = env->mtrr_fixed[(uint32_t)ECX - MSR_MTRRfix16K_80000 + 1];
 501         break;
 502     case MSR_MTRRfix4K_C0000:
 503     case MSR_MTRRfix4K_C8000:
 504     case MSR_MTRRfix4K_D0000:
 505     case MSR_MTRRfix4K_D8000:
 506     case MSR_MTRRfix4K_E0000:
 507     case MSR_MTRRfix4K_E8000:
 508     case MSR_MTRRfix4K_F0000:
 509     case MSR_MTRRfix4K_F8000:
 510         val = env->mtrr_fixed[(uint32_t)ECX - MSR_MTRRfix4K_C0000 + 3];
 511         break;
 512     case MSR_MTRRdefType:
 513         val = env->mtrr_deftype;
 514         break;
 515     case MSR_MTRRcap:
 516         if (env->cpuid_features & CPUID_MTRR) {
 517             val = MSR_MTRRcap_VCNT | MSR_MTRRcap_FIXRANGE_SUPPORT |
 518                 MSR_MTRRcap_WC_SUPPORTED;
 519         } else {
 520             /* XXX: exception? */
 521             val = 0;
 522         }
 523         break;
 524     case MSR_MCG_CAP:
 525         val = env->mcg_cap;
 526         break;
 527     case MSR_MCG_CTL:
 528         if (env->mcg_cap & MCG_CTL_P) {
 529             val = env->mcg_ctl;
 530         } else {
 531             val = 0;
 532         }
 533         break;
 534     case MSR_MCG_STATUS:
 535         val = env->mcg_status;
 536         break;
 537     case MSR_IA32_MISC_ENABLE:
 538         val = env->msr_ia32_misc_enable;
 539         break;
 540     default:
 541         if ((uint32_t)ECX >= MSR_MC0_CTL
 542             && (uint32_t)ECX < MSR_MC0_CTL + (4 * env->mcg_cap & 0xff)) {
 543             uint32_t offset = (uint32_t)ECX - MSR_MC0_CTL;
 544             val = env->mce_banks[offset];
 545             break;
 546         }
 547         /* XXX: exception? */
 548         val = 0;
 549         break;
 550     }
 551     EAX = (uint32_t)(val);
 552     EDX = (uint32_t)(val >> 32);
 553 }
 554 #endif
 555
 556 static void do_hlt(X86CPU *cpu)
 557 {
 558     CPUState *cs = CPU(cpu);
 559     CPUX86State *env = &cpu->env;
 560
 561     env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
 562     cs->halted = 1;
 563     env->exception_index = EXCP_HLT;
 564     cpu_loop_exit(env);
 565 }
 566
 567 void helper_hlt(CPUX86State *env, int next_eip_addend)
 568 {
 569     X86CPU *cpu = x86_env_get_cpu(env);
 570
 571     cpu_svm_check_intercept_param(env, SVM_EXIT_HLT, 0);
 572     EIP += next_eip_addend;
 573
 574     do_hlt(cpu);
 575 }
 576
 577 void helper_monitor(CPUX86State *env, target_ulong ptr)
 578 {
 579     if ((uint32_t)ECX != 0) {
 580         raise_exception(env, EXCP0D_GPF);
 581     }
 582     /* XXX: store address? */
 583     cpu_svm_check_intercept_param(env, SVM_EXIT_MONITOR, 0);
 584 }
 585
 586 void helper_mwait(CPUX86State *env, int next_eip_addend)
 587 {
 588     CPUState *cs;
 589     X86CPU *cpu;
 590
 591     if ((uint32_t)ECX != 0) {
 592         raise_exception(env, EXCP0D_GPF);
 593     }
 594     cpu_svm_check_intercept_param(env, SVM_EXIT_MWAIT, 0);
 595     EIP += next_eip_addend;
 596
 597     cpu = x86_env_get_cpu(env);
 598     cs = CPU(cpu);
 599     /* XXX: not complete but not completely erroneous */
 600     if (cs->cpu_index != 0 || env->next_cpu != NULL) {
 601         /* more than one CPU: do not sleep because another CPU may
 602            wake this one */
 603     } else {
 604         do_hlt(cpu);
 605     }
 606 }
 607
 608 void helper_debug(CPUX86State *env)
 609 {
 610     env->exception_index = EXCP_DEBUG;
 611     cpu_loop_exit(env);
 612 }