target-i386/cpu.h

   1 /*
   2  * i386 virtual CPU header
   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, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #ifndef CPU_I386_H
  21 #define CPU_I386_H
  22
  23 #include "config.h"
  24
  25 #ifdef TARGET_X86_64
  26 #define TARGET_LONG_BITS 64
  27 #else
  28 #define TARGET_LONG_BITS 32
  29 #endif
  30
  31 /* target supports implicit self modifying code */
  32 #define TARGET_HAS_SMC
  33 /* support for self modifying code even if the modified instruction is
  34    close to the modifying instruction */
  35 #define TARGET_HAS_PRECISE_SMC
  36
  37 #define TARGET_HAS_ICE 1
  38
  39 #ifdef TARGET_X86_64
  40 #define ELF_MACHINE     EM_X86_64
  41 #else
  42 #define ELF_MACHINE     EM_386
  43 #endif
  44
  45 #include "cpu-defs.h"
  46
  47 #include "softfloat.h"
  48
  49 #if defined(__i386__) && !defined(CONFIG_SOFTMMU) && !defined(__APPLE__)
  50 #define USE_CODE_COPY
  51 #endif
  52
  53 #define R_EAX 0
  54 #define R_ECX 1
  55 #define R_EDX 2
  56 #define R_EBX 3
  57 #define R_ESP 4
  58 #define R_EBP 5
  59 #define R_ESI 6
  60 #define R_EDI 7
  61
  62 #define R_AL 0
  63 #define R_CL 1
  64 #define R_DL 2
  65 #define R_BL 3
  66 #define R_AH 4
  67 #define R_CH 5
  68 #define R_DH 6
  69 #define R_BH 7
  70
  71 #define R_ES 0
  72 #define R_CS 1
  73 #define R_SS 2
  74 #define R_DS 3
  75 #define R_FS 4
  76 #define R_GS 5
  77
  78 /* segment descriptor fields */
  79 #define DESC_G_MASK     (1 << 23)
  80 #define DESC_B_SHIFT    22
  81 #define DESC_B_MASK     (1 << DESC_B_SHIFT)
  82 #define DESC_L_SHIFT    21 /* x86_64 only : 64 bit code segment */
  83 #define DESC_L_MASK     (1 << DESC_L_SHIFT)
  84 #define DESC_AVL_MASK   (1 << 20)
  85 #define DESC_P_MASK     (1 << 15)
  86 #define DESC_DPL_SHIFT  13
  87 #define DESC_S_MASK     (1 << 12)
  88 #define DESC_TYPE_SHIFT 8
  89 #define DESC_A_MASK     (1 << 8)
  90
  91 #define DESC_CS_MASK    (1 << 11) /* 1=code segment 0=data segment */
  92 #define DESC_C_MASK     (1 << 10) /* code: conforming */
  93 #define DESC_R_MASK     (1 << 9)  /* code: readable */
  94
  95 #define DESC_E_MASK     (1 << 10) /* data: expansion direction */
  96 #define DESC_W_MASK     (1 << 9)  /* data: writable */
  97
  98 #define DESC_TSS_BUSY_MASK (1 << 9)
  99
 100 /* eflags masks */
 101 #define CC_C    0x0001
 102 #define CC_P    0x0004
 103 #define CC_A    0x0010
 104 #define CC_Z    0x0040
 105 #define CC_S    0x0080
 106 #define CC_O    0x0800
 107
 108 #define TF_SHIFT   8
 109 #define IOPL_SHIFT 12
 110 #define VM_SHIFT   17
 111
 112 #define TF_MASK                 0x00000100
 113 #define IF_MASK                 0x00000200
 114 #define DF_MASK                 0x00000400
 115 #define IOPL_MASK               0x00003000
 116 #define NT_MASK                 0x00004000
 117 #define RF_MASK                 0x00010000
 118 #define VM_MASK                 0x00020000
 119 #define AC_MASK                 0x00040000
 120 #define VIF_MASK                0x00080000
 121 #define VIP_MASK                0x00100000
 122 #define ID_MASK                 0x00200000
 123
 124 /* hidden flags - used internally by qemu to represent additionnal cpu
 125    states. Only the CPL, INHIBIT_IRQ and HALTED are not redundant. We avoid
 126    using the IOPL_MASK, TF_MASK and VM_MASK bit position to ease oring
 127    with eflags. */
 128 /* current cpl */
 129 #define HF_CPL_SHIFT         0
 130 /* true if soft mmu is being used */
 131 #define HF_SOFTMMU_SHIFT     2
 132 /* true if hardware interrupts must be disabled for next instruction */
 133 #define HF_INHIBIT_IRQ_SHIFT 3
 134 /* 16 or 32 segments */
 135 #define HF_CS32_SHIFT        4
 136 #define HF_SS32_SHIFT        5
 137 /* zero base for DS, ES and SS : can be '0' only in 32 bit CS segment */
 138 #define HF_ADDSEG_SHIFT      6
 139 /* copy of CR0.PE (protected mode) */
 140 #define HF_PE_SHIFT          7
 141 #define HF_TF_SHIFT          8 /* must be same as eflags */
 142 #define HF_MP_SHIFT          9 /* the order must be MP, EM, TS */
 143 #define HF_EM_SHIFT         10
 144 #define HF_TS_SHIFT         11
 145 #define HF_IOPL_SHIFT       12 /* must be same as eflags */
 146 #define HF_LMA_SHIFT        14 /* only used on x86_64: long mode active */
 147 #define HF_CS64_SHIFT       15 /* only used on x86_64: 64 bit code segment  */
 148 #define HF_OSFXSR_SHIFT     16 /* CR4.OSFXSR */
 149 #define HF_VM_SHIFT         17 /* must be same as eflags */
 150 #define HF_HALTED_SHIFT     18 /* CPU halted */
 151 #define HF_SMM_SHIFT        19 /* CPU in SMM mode */
 152
 153 #define HF_CPL_MASK          (3 << HF_CPL_SHIFT)
 154 #define HF_SOFTMMU_MASK      (1 << HF_SOFTMMU_SHIFT)
 155 #define HF_INHIBIT_IRQ_MASK  (1 << HF_INHIBIT_IRQ_SHIFT)
 156 #define HF_CS32_MASK         (1 << HF_CS32_SHIFT)
 157 #define HF_SS32_MASK         (1 << HF_SS32_SHIFT)
 158 #define HF_ADDSEG_MASK       (1 << HF_ADDSEG_SHIFT)
 159 #define HF_PE_MASK           (1 << HF_PE_SHIFT)
 160 #define HF_TF_MASK           (1 << HF_TF_SHIFT)
 161 #define HF_MP_MASK           (1 << HF_MP_SHIFT)
 162 #define HF_EM_MASK           (1 << HF_EM_SHIFT)
 163 #define HF_TS_MASK           (1 << HF_TS_SHIFT)
 164 #define HF_LMA_MASK          (1 << HF_LMA_SHIFT)
 165 #define HF_CS64_MASK         (1 << HF_CS64_SHIFT)
 166 #define HF_OSFXSR_MASK       (1 << HF_OSFXSR_SHIFT)
 167 #define HF_HALTED_MASK       (1 << HF_HALTED_SHIFT)
 168 #define HF_SMM_MASK          (1 << HF_SMM_SHIFT)
 169
 170 #define CR0_PE_MASK  (1 << 0)
 171 #define CR0_MP_MASK  (1 << 1)
 172 #define CR0_EM_MASK  (1 << 2)
 173 #define CR0_TS_MASK  (1 << 3)
 174 #define CR0_ET_MASK  (1 << 4)
 175 #define CR0_NE_MASK  (1 << 5)
 176 #define CR0_WP_MASK  (1 << 16)
 177 #define CR0_AM_MASK  (1 << 18)
 178 #define CR0_PG_MASK  (1 << 31)
 179
 180 #define CR4_VME_MASK  (1 << 0)
 181 #define CR4_PVI_MASK  (1 << 1)
 182 #define CR4_TSD_MASK  (1 << 2)
 183 #define CR4_DE_MASK   (1 << 3)
 184 #define CR4_PSE_MASK  (1 << 4)
 185 #define CR4_PAE_MASK  (1 << 5)
 186 #define CR4_PGE_MASK  (1 << 7)
 187 #define CR4_PCE_MASK  (1 << 8)
 188 #define CR4_OSFXSR_MASK (1 << 9)
 189 #define CR4_OSXMMEXCPT_MASK  (1 << 10)
 190
 191 #define PG_PRESENT_BIT  0
 192 #define PG_RW_BIT       1
 193 #define PG_USER_BIT     2
 194 #define PG_PWT_BIT      3
 195 #define PG_PCD_BIT      4
 196 #define PG_ACCESSED_BIT 5
 197 #define PG_DIRTY_BIT    6
 198 #define PG_PSE_BIT      7
 199 #define PG_GLOBAL_BIT   8
 200 #define PG_NX_BIT       63
 201
 202 #define PG_PRESENT_MASK  (1 << PG_PRESENT_BIT)
 203 #define PG_RW_MASK       (1 << PG_RW_BIT)
 204 #define PG_USER_MASK     (1 << PG_USER_BIT)
 205 #define PG_PWT_MASK      (1 << PG_PWT_BIT)
 206 #define PG_PCD_MASK      (1 << PG_PCD_BIT)
 207 #define PG_ACCESSED_MASK (1 << PG_ACCESSED_BIT)
 208 #define PG_DIRTY_MASK    (1 << PG_DIRTY_BIT)
 209 #define PG_PSE_MASK      (1 << PG_PSE_BIT)
 210 #define PG_GLOBAL_MASK   (1 << PG_GLOBAL_BIT)
 211 #define PG_NX_MASK       (1LL << PG_NX_BIT)
 212
 213 #define PG_ERROR_W_BIT     1
 214
 215 #define PG_ERROR_P_MASK    0x01
 216 #define PG_ERROR_W_MASK    (1 << PG_ERROR_W_BIT)
 217 #define PG_ERROR_U_MASK    0x04
 218 #define PG_ERROR_RSVD_MASK 0x08
 219 #define PG_ERROR_I_D_MASK  0x10
 220
 221 #define MSR_IA32_APICBASE               0x1b
 222 #define MSR_IA32_APICBASE_BSP           (1<<8)
 223 #define MSR_IA32_APICBASE_ENABLE        (1<<11)
 224 #define MSR_IA32_APICBASE_BASE          (0xfffff<<12)
 225
 226 #define MSR_IA32_SYSENTER_CS            0x174
 227 #define MSR_IA32_SYSENTER_ESP           0x175
 228 #define MSR_IA32_SYSENTER_EIP           0x176
 229
 230 #define MSR_MCG_CAP                     0x179
 231 #define MSR_MCG_STATUS                  0x17a
 232 #define MSR_MCG_CTL                     0x17b
 233
 234 #define MSR_PAT                         0x277
 235
 236 #define MSR_EFER                        0xc0000080
 237
 238 #define MSR_EFER_SCE   (1 << 0)
 239 #define MSR_EFER_LME   (1 << 8)
 240 #define MSR_EFER_LMA   (1 << 10)
 241 #define MSR_EFER_NXE   (1 << 11)
 242 #define MSR_EFER_FFXSR (1 << 14)
 243
 244 #define MSR_STAR                        0xc0000081
 245 #define MSR_LSTAR                       0xc0000082
 246 #define MSR_CSTAR                       0xc0000083
 247 #define MSR_FMASK                       0xc0000084
 248 #define MSR_FSBASE                      0xc0000100
 249 #define MSR_GSBASE                      0xc0000101
 250 #define MSR_KERNELGSBASE                0xc0000102
 251
 252 /* cpuid_features bits */
 253 #define CPUID_FP87 (1 << 0)
 254 #define CPUID_VME  (1 << 1)
 255 #define CPUID_DE   (1 << 2)
 256 #define CPUID_PSE  (1 << 3)
 257 #define CPUID_TSC  (1 << 4)
 258 #define CPUID_MSR  (1 << 5)
 259 #define CPUID_PAE  (1 << 6)
 260 #define CPUID_MCE  (1 << 7)
 261 #define CPUID_CX8  (1 << 8)
 262 #define CPUID_APIC (1 << 9)
 263 #define CPUID_SEP  (1 << 11) /* sysenter/sysexit */
 264 #define CPUID_MTRR (1 << 12)
 265 #define CPUID_PGE  (1 << 13)
 266 #define CPUID_MCA  (1 << 14)
 267 #define CPUID_CMOV (1 << 15)
 268 #define CPUID_PAT  (1 << 16)
 269 #define CPUID_PSE36   (1 << 17)
 270 #define CPUID_CLFLUSH (1 << 19)
 271 /* ... */
 272 #define CPUID_MMX  (1 << 23)
 273 #define CPUID_FXSR (1 << 24)
 274 #define CPUID_SSE  (1 << 25)
 275 #define CPUID_SSE2 (1 << 26)
 276
 277 #define CPUID_EXT_SSE3     (1 << 0)
 278 #define CPUID_EXT_MONITOR  (1 << 3)
 279 #define CPUID_EXT_CX16     (1 << 13)
 280
 281 #define CPUID_EXT2_SYSCALL (1 << 11)
 282 #define CPUID_EXT2_NX      (1 << 20)
 283 #define CPUID_EXT2_FFXSR   (1 << 25)
 284 #define CPUID_EXT2_LM      (1 << 29)
 285
 286 #define EXCP00_DIVZ     0
 287 #define EXCP01_SSTP     1
 288 #define EXCP02_NMI      2
 289 #define EXCP03_INT3     3
 290 #define EXCP04_INTO     4
 291 #define EXCP05_BOUND    5
 292 #define EXCP06_ILLOP    6
 293 #define EXCP07_PREX     7
 294 #define EXCP08_DBLE     8
 295 #define EXCP09_XERR     9
 296 #define EXCP0A_TSS      10
 297 #define EXCP0B_NOSEG    11
 298 #define EXCP0C_STACK    12
 299 #define EXCP0D_GPF      13
 300 #define EXCP0E_PAGE     14
 301 #define EXCP10_COPR     16
 302 #define EXCP11_ALGN     17
 303 #define EXCP12_MCHK     18
 304
 305 enum {
 306     CC_OP_DYNAMIC, /* must use dynamic code to get cc_op */
 307     CC_OP_EFLAGS,  /* all cc are explicitely computed, CC_SRC = flags */
 308
 309     CC_OP_MULB, /* modify all flags, C, O = (CC_SRC != 0) */
 310     CC_OP_MULW,
 311     CC_OP_MULL,
 312     CC_OP_MULQ,
 313
 314     CC_OP_ADDB, /* modify all flags, CC_DST = res, CC_SRC = src1 */
 315     CC_OP_ADDW,
 316     CC_OP_ADDL,
 317     CC_OP_ADDQ,
 318
 319     CC_OP_ADCB, /* modify all flags, CC_DST = res, CC_SRC = src1 */
 320     CC_OP_ADCW,
 321     CC_OP_ADCL,
 322     CC_OP_ADCQ,
 323
 324     CC_OP_SUBB, /* modify all flags, CC_DST = res, CC_SRC = src1 */
 325     CC_OP_SUBW,
 326     CC_OP_SUBL,
 327     CC_OP_SUBQ,
 328
 329     CC_OP_SBBB, /* modify all flags, CC_DST = res, CC_SRC = src1 */
 330     CC_OP_SBBW,
 331     CC_OP_SBBL,
 332     CC_OP_SBBQ,
 333
 334     CC_OP_LOGICB, /* modify all flags, CC_DST = res */
 335     CC_OP_LOGICW,
 336     CC_OP_LOGICL,
 337     CC_OP_LOGICQ,
 338
 339     CC_OP_INCB, /* modify all flags except, CC_DST = res, CC_SRC = C */
 340     CC_OP_INCW,
 341     CC_OP_INCL,
 342     CC_OP_INCQ,
 343
 344     CC_OP_DECB, /* modify all flags except, CC_DST = res, CC_SRC = C  */
 345     CC_OP_DECW,
 346     CC_OP_DECL,
 347     CC_OP_DECQ,
 348
 349     CC_OP_SHLB, /* modify all flags, CC_DST = res, CC_SRC.msb = C */
 350     CC_OP_SHLW,
 351     CC_OP_SHLL,
 352     CC_OP_SHLQ,
 353
 354     CC_OP_SARB, /* modify all flags, CC_DST = res, CC_SRC.lsb = C */
 355     CC_OP_SARW,
 356     CC_OP_SARL,
 357     CC_OP_SARQ,
 358
 359     CC_OP_NB,
 360 };
 361
 362 #ifdef FLOATX80
 363 #define USE_X86LDOUBLE
 364 #endif
 365
 366 #ifdef USE_X86LDOUBLE
 367 typedef floatx80 CPU86_LDouble;
 368 #else
 369 typedef float64 CPU86_LDouble;
 370 #endif
 371
 372 typedef struct SegmentCache {
 373     uint32_t selector;
 374     target_ulong base;
 375     uint32_t limit;
 376     uint32_t flags;
 377 } SegmentCache;
 378
 379 typedef union {
 380     uint8_t _b[16];
 381     uint16_t _w[8];
 382     uint32_t _l[4];
 383     uint64_t _q[2];
 384     float32 _s[4];
 385     float64 _d[2];
 386 } XMMReg;
 387
 388 typedef union {
 389     uint8_t _b[8];
 390     uint16_t _w[2];
 391     uint32_t _l[1];
 392     uint64_t q;
 393 } MMXReg;
 394
 395 #ifdef WORDS_BIGENDIAN
 396 #define XMM_B(n) _b[15 - (n)]
 397 #define XMM_W(n) _w[7 - (n)]
 398 #define XMM_L(n) _l[3 - (n)]
 399 #define XMM_S(n) _s[3 - (n)]
 400 #define XMM_Q(n) _q[1 - (n)]
 401 #define XMM_D(n) _d[1 - (n)]
 402
 403 #define MMX_B(n) _b[7 - (n)]
 404 #define MMX_W(n) _w[3 - (n)]
 405 #define MMX_L(n) _l[1 - (n)]
 406 #else
 407 #define XMM_B(n) _b[n]
 408 #define XMM_W(n) _w[n]
 409 #define XMM_L(n) _l[n]
 410 #define XMM_S(n) _s[n]
 411 #define XMM_Q(n) _q[n]
 412 #define XMM_D(n) _d[n]
 413
 414 #define MMX_B(n) _b[n]
 415 #define MMX_W(n) _w[n]
 416 #define MMX_L(n) _l[n]
 417 #endif
 418 #define MMX_Q(n) q
 419
 420 #ifdef TARGET_X86_64
 421 #define CPU_NB_REGS 16
 422 #else
 423 #define CPU_NB_REGS 8
 424 #endif
 425
 426 typedef struct CPUX86State {
 427 #if TARGET_LONG_BITS > HOST_LONG_BITS
 428     /* temporaries if we cannot store them in host registers */
 429     target_ulong t0, t1, t2;
 430 #endif
 431
 432     /* standard registers */
 433     target_ulong regs[CPU_NB_REGS];
 434     target_ulong eip;
 435     target_ulong eflags; /* eflags register. During CPU emulation, CC
 436                         flags and DF are set to zero because they are
 437                         stored elsewhere */
 438
 439     /* emulator internal eflags handling */
 440     target_ulong cc_src;
 441     target_ulong cc_dst;
 442     uint32_t cc_op;
 443     int32_t df; /* D flag : 1 if D = 0, -1 if D = 1 */
 444     uint32_t hflags; /* hidden flags, see HF_xxx constants */
 445
 446     /* segments */
 447     SegmentCache segs[6]; /* selector values */
 448     SegmentCache ldt;
 449     SegmentCache tr;
 450     SegmentCache gdt; /* only base and limit are used */
 451     SegmentCache idt; /* only base and limit are used */
 452
 453     target_ulong cr[5]; /* NOTE: cr1 is unused */
 454     uint32_t a20_mask;
 455
 456     /* FPU state */
 457     unsigned int fpstt; /* top of stack index */
 458     unsigned int fpus;
 459     unsigned int fpuc;
 460     uint8_t fptags[8];   /* 0 = valid, 1 = empty */
 461     union {
 462 #ifdef USE_X86LDOUBLE
 463         CPU86_LDouble d __attribute__((aligned(16)));
 464 #else
 465         CPU86_LDouble d;
 466 #endif
 467         MMXReg mmx;
 468     } fpregs[8];
 469
 470     /* emulator internal variables */
 471     float_status fp_status;
 472     CPU86_LDouble ft0;
 473     union {
 474         float f;
 475         double d;
 476         int i32;
 477         int64_t i64;
 478     } fp_convert;
 479
 480     float_status sse_status;
 481     uint32_t mxcsr;
 482     XMMReg xmm_regs[CPU_NB_REGS];
 483     XMMReg xmm_t0;
 484     MMXReg mmx_t0;
 485
 486     /* sysenter registers */
 487     uint32_t sysenter_cs;
 488     uint32_t sysenter_esp;
 489     uint32_t sysenter_eip;
 490     uint64_t efer;
 491     uint64_t star;
 492 #ifdef TARGET_X86_64
 493     target_ulong lstar;
 494     target_ulong cstar;
 495     target_ulong fmask;
 496     target_ulong kernelgsbase;
 497 #endif
 498
 499     uint64_t pat;
 500
 501     /* temporary data for USE_CODE_COPY mode */
 502 #ifdef USE_CODE_COPY
 503     uint32_t tmp0;
 504     uint32_t saved_esp;
 505     int native_fp_regs; /* if true, the FPU state is in the native CPU regs */
 506 #endif
 507
 508     /* exception/interrupt handling */
 509     jmp_buf jmp_env;
 510     int exception_index;
 511     int error_code;
 512     int exception_is_int;
 513     target_ulong exception_next_eip;
 514     target_ulong dr[8]; /* debug registers */
 515     uint32_t smbase;
 516     int interrupt_request;
 517     int user_mode_only; /* user mode only simulation */
 518
 519     CPU_COMMON
 520
 521     /* processor features (e.g. for CPUID insn) */
 522     uint32_t cpuid_level;
 523     uint32_t cpuid_vendor1;
 524     uint32_t cpuid_vendor2;
 525     uint32_t cpuid_vendor3;
 526     uint32_t cpuid_version;
 527     uint32_t cpuid_features;
 528     uint32_t cpuid_ext_features;
 529     uint32_t cpuid_xlevel;
 530     uint32_t cpuid_model[12];
 531     uint32_t cpuid_ext2_features;
 532
 533 #ifdef USE_KQEMU
 534     int kqemu_enabled;
 535     int last_io_time;
 536 #endif
 537     /* in order to simplify APIC support, we leave this pointer to the
 538        user */
 539     struct APICState *apic_state;
 540 } CPUX86State;
 541
 542 CPUX86State *cpu_x86_init(void);
 543 int cpu_x86_exec(CPUX86State *s);
 544 void cpu_x86_close(CPUX86State *s);
 545 int cpu_get_pic_interrupt(CPUX86State *s);
 546 /* MSDOS compatibility mode FPU exception support */
 547 void cpu_set_ferr(CPUX86State *s);
 548
 549 /* this function must always be used to load data in the segment
 550    cache: it synchronizes the hflags with the segment cache values */
 551 static inline void cpu_x86_load_seg_cache(CPUX86State *env,
 552                                           int seg_reg, unsigned int selector,
 553                                           target_ulong base,
 554                                           unsigned int limit,
 555                                           unsigned int flags)
 556 {
 557     SegmentCache *sc;
 558     unsigned int new_hflags;
 559
 560     sc = &env->segs[seg_reg];
 561     sc->selector = selector;
 562     sc->base = base;
 563     sc->limit = limit;
 564     sc->flags = flags;
 565
 566     /* update the hidden flags */
 567     {
 568         if (seg_reg == R_CS) {
 569 #ifdef TARGET_X86_64
 570             if ((env->hflags & HF_LMA_MASK) && (flags & DESC_L_MASK)) {
 571                 /* long mode */
 572                 env->hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
 573                 env->hflags &= ~(HF_ADDSEG_MASK);
 574             } else
 575 #endif
 576             {
 577                 /* legacy / compatibility case */
 578                 new_hflags = (env->segs[R_CS].flags & DESC_B_MASK)
 579                     >> (DESC_B_SHIFT - HF_CS32_SHIFT);
 580                 env->hflags = (env->hflags & ~(HF_CS32_MASK | HF_CS64_MASK)) |
 581                     new_hflags;
 582             }
 583         }
 584         new_hflags = (env->segs[R_SS].flags & DESC_B_MASK)
 585             >> (DESC_B_SHIFT - HF_SS32_SHIFT);
 586         if (env->hflags & HF_CS64_MASK) {
 587             /* zero base assumed for DS, ES and SS in long mode */
 588         } else if (!(env->cr[0] & CR0_PE_MASK) ||
 589                    (env->eflags & VM_MASK) ||
 590                    !(env->hflags & HF_CS32_MASK)) {
 591             /* XXX: try to avoid this test. The problem comes from the
 592                fact that is real mode or vm86 mode we only modify the
 593                'base' and 'selector' fields of the segment cache to go
 594                faster. A solution may be to force addseg to one in
 595                translate-i386.c. */
 596             new_hflags |= HF_ADDSEG_MASK;
 597         } else {
 598             new_hflags |= ((env->segs[R_DS].base |
 599                             env->segs[R_ES].base |
 600                             env->segs[R_SS].base) != 0) <<
 601                 HF_ADDSEG_SHIFT;
 602         }
 603         env->hflags = (env->hflags &
 604                        ~(HF_SS32_MASK | HF_ADDSEG_MASK)) | new_hflags;
 605     }
 606 }
 607
 608 /* wrapper, just in case memory mappings must be changed */
 609 static inline void cpu_x86_set_cpl(CPUX86State *s, int cpl)
 610 {
 611 #if HF_CPL_MASK == 3
 612     s->hflags = (s->hflags & ~HF_CPL_MASK) | cpl;
 613 #else
 614 #error HF_CPL_MASK is hardcoded
 615 #endif
 616 }
 617
 618 /* used for debug or cpu save/restore */
 619 void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f);
 620 CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper);
 621
 622 /* the following helpers are only usable in user mode simulation as
 623    they can trigger unexpected exceptions */
 624 void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector);
 625 void cpu_x86_fsave(CPUX86State *s, uint8_t *ptr, int data32);
 626 void cpu_x86_frstor(CPUX86State *s, uint8_t *ptr, int data32);
 627
 628 /* you can call this signal handler from your SIGBUS and SIGSEGV
 629    signal handlers to inform the virtual CPU of exceptions. non zero
 630    is returned if the signal was handled by the virtual CPU.  */
 631 int cpu_x86_signal_handler(int host_signum, void *pinfo,
 632                            void *puc);
 633 void cpu_x86_set_a20(CPUX86State *env, int a20_state);
 634
 635 uint64_t cpu_get_tsc(CPUX86State *env);
 636
 637 void cpu_set_apic_base(CPUX86State *env, uint64_t val);
 638 uint64_t cpu_get_apic_base(CPUX86State *env);
 639 void cpu_set_apic_tpr(CPUX86State *env, uint8_t val);
 640 #ifndef NO_CPU_IO_DEFS
 641 uint8_t cpu_get_apic_tpr(CPUX86State *env);
 642 #endif
 643 void cpu_smm_update(CPUX86State *env);
 644
 645 /* will be suppressed */
 646 void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0);
 647
 648 /* used to debug */
 649 #define X86_DUMP_FPU  0x0001 /* dump FPU state too */
 650 #define X86_DUMP_CCOP 0x0002 /* dump qemu flag cache */
 651
 652 #ifdef USE_KQEMU
 653 static inline int cpu_get_time_fast(void)
 654 {
 655     int low, high;
 656     asm volatile("rdtsc" : "=a" (low), "=d" (high));
 657     return low;
 658 }
 659 #endif
 660
 661 #define TARGET_PAGE_BITS 12
 662 #include "cpu-all.h"
 663
 664 #endif /* CPU_I386_H */