target-i386/machine.c

   1 #include "hw/hw.h"
   2 #include "hw/boards.h"
   3 #include "hw/pc.h"
   4 #include "hw/isa.h"
   5 #include "host-utils.h"
   6
   7 #include "exec-all.h"
   8 #include "kvm.h"
   9
  10 static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)
  11 {
  12     qemu_put_be32(f, dt->selector);
  13     qemu_put_betl(f, dt->base);
  14     qemu_put_be32(f, dt->limit);
  15     qemu_put_be32(f, dt->flags);
  16 }
  17
  18 static void cpu_get_seg(QEMUFile *f, SegmentCache *dt)
  19 {
  20     dt->selector = qemu_get_be32(f);
  21     dt->base = qemu_get_betl(f);
  22     dt->limit = qemu_get_be32(f);
  23     dt->flags = qemu_get_be32(f);
  24 }
  25
  26 void cpu_save(QEMUFile *f, void *opaque)
  27 {
  28     CPUState *env = opaque;
  29     uint16_t fptag, fpus, fpuc, fpregs_format;
  30     uint32_t hflags;
  31     int32_t a20_mask;
  32     int32_t pending_irq;
  33     int i, bit;
  34
  35     cpu_synchronize_state(env, 0);
  36
  37     for(i = 0; i < CPU_NB_REGS; i++)
  38         qemu_put_betls(f, &env->regs[i]);
  39     qemu_put_betls(f, &env->eip);
  40     qemu_put_betls(f, &env->eflags);
  41     hflags = env->hflags; /* XXX: suppress most of the redundant hflags */
  42     qemu_put_be32s(f, &hflags);
  43
  44     /* FPU */
  45     fpuc = env->fpuc;
  46     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
  47     fptag = 0;
  48     for(i = 0; i < 8; i++) {
  49         fptag |= ((!env->fptags[i]) << i);
  50     }
  51
  52     qemu_put_be16s(f, &fpuc);
  53     qemu_put_be16s(f, &fpus);
  54     qemu_put_be16s(f, &fptag);
  55
  56 #ifdef USE_X86LDOUBLE
  57     fpregs_format = 0;
  58 #else
  59     fpregs_format = 1;
  60 #endif
  61     qemu_put_be16s(f, &fpregs_format);
  62
  63     for(i = 0; i < 8; i++) {
  64 #ifdef USE_X86LDOUBLE
  65         {
  66             uint64_t mant;
  67             uint16_t exp;
  68             /* we save the real CPU data (in case of MMX usage only 'mant'
  69                contains the MMX register */
  70             cpu_get_fp80(&mant, &exp, env->fpregs[i].d);
  71             qemu_put_be64(f, mant);
  72             qemu_put_be16(f, exp);
  73         }
  74 #else
  75         /* if we use doubles for float emulation, we save the doubles to
  76            avoid losing information in case of MMX usage. It can give
  77            problems if the image is restored on a CPU where long
  78            doubles are used instead. */
  79         qemu_put_be64(f, env->fpregs[i].mmx.MMX_Q(0));
  80 #endif
  81     }
  82
  83     for(i = 0; i < 6; i++)
  84         cpu_put_seg(f, &env->segs[i]);
  85     cpu_put_seg(f, &env->ldt);
  86     cpu_put_seg(f, &env->tr);
  87     cpu_put_seg(f, &env->gdt);
  88     cpu_put_seg(f, &env->idt);
  89
  90     qemu_put_be32s(f, &env->sysenter_cs);
  91     qemu_put_betls(f, &env->sysenter_esp);
  92     qemu_put_betls(f, &env->sysenter_eip);
  93
  94     qemu_put_betls(f, &env->cr[0]);
  95     qemu_put_betls(f, &env->cr[2]);
  96     qemu_put_betls(f, &env->cr[3]);
  97     qemu_put_betls(f, &env->cr[4]);
  98
  99     for(i = 0; i < 8; i++)
 100         qemu_put_betls(f, &env->dr[i]);
 101
 102     /* MMU */
 103     a20_mask = (int32_t) env->a20_mask;
 104     qemu_put_sbe32s(f, &a20_mask);
 105
 106     /* XMM */
 107     qemu_put_be32s(f, &env->mxcsr);
 108     for(i = 0; i < CPU_NB_REGS; i++) {
 109         qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(0));
 110         qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(1));
 111     }
 112
 113 #ifdef TARGET_X86_64
 114     qemu_put_be64s(f, &env->efer);
 115     qemu_put_be64s(f, &env->star);
 116     qemu_put_be64s(f, &env->lstar);
 117     qemu_put_be64s(f, &env->cstar);
 118     qemu_put_be64s(f, &env->fmask);
 119     qemu_put_be64s(f, &env->kernelgsbase);
 120 #endif
 121     qemu_put_be32s(f, &env->smbase);
 122
 123     qemu_put_be64s(f, &env->pat);
 124     qemu_put_be32s(f, &env->hflags2);
 125
 126     qemu_put_be64s(f, &env->vm_hsave);
 127     qemu_put_be64s(f, &env->vm_vmcb);
 128     qemu_put_be64s(f, &env->tsc_offset);
 129     qemu_put_be64s(f, &env->intercept);
 130     qemu_put_be16s(f, &env->intercept_cr_read);
 131     qemu_put_be16s(f, &env->intercept_cr_write);
 132     qemu_put_be16s(f, &env->intercept_dr_read);
 133     qemu_put_be16s(f, &env->intercept_dr_write);
 134     qemu_put_be32s(f, &env->intercept_exceptions);
 135     qemu_put_8s(f, &env->v_tpr);
 136
 137     /* MTRRs */
 138     for(i = 0; i < 11; i++)
 139         qemu_put_be64s(f, &env->mtrr_fixed[i]);
 140     qemu_put_be64s(f, &env->mtrr_deftype);
 141     for(i = 0; i < 8; i++) {
 142         qemu_put_be64s(f, &env->mtrr_var[i].base);
 143         qemu_put_be64s(f, &env->mtrr_var[i].mask);
 144     }
 145
 146     /* KVM-related states */
 147
 148     /* There can only be one pending IRQ set in the bitmap at a time, so try
 149        to find it and save its number instead (-1 for none). */
 150     pending_irq = -1;
 151     for (i = 0; i < ARRAY_SIZE(env->interrupt_bitmap); i++) {
 152         if (env->interrupt_bitmap[i]) {
 153             bit = ctz64(env->interrupt_bitmap[i]);
 154             pending_irq = i * 64 + bit;
 155             break;
 156         }
 157     }
 158     qemu_put_sbe32s(f, &pending_irq);
 159     qemu_put_be32s(f, &env->mp_state);
 160     qemu_put_be64s(f, &env->tsc);
 161
 162     /* MCE */
 163     qemu_put_be64s(f, &env->mcg_cap);
 164     if (env->mcg_cap) {
 165         qemu_put_be64s(f, &env->mcg_status);
 166         qemu_put_be64s(f, &env->mcg_ctl);
 167         for (i = 0; i < (env->mcg_cap & 0xff); i++) {
 168             qemu_put_be64s(f, &env->mce_banks[4*i]);
 169             qemu_put_be64s(f, &env->mce_banks[4*i + 1]);
 170             qemu_put_be64s(f, &env->mce_banks[4*i + 2]);
 171             qemu_put_be64s(f, &env->mce_banks[4*i + 3]);
 172         }
 173     }
 174  }
 175
 176 #ifdef USE_X86LDOUBLE
 177 /* XXX: add that in a FPU generic layer */
 178 union x86_longdouble {
 179     uint64_t mant;
 180     uint16_t exp;
 181 };
 182
 183 #define MANTD1(fp)      (fp & ((1LL << 52) - 1))
 184 #define EXPBIAS1 1023
 185 #define EXPD1(fp)       ((fp >> 52) & 0x7FF)
 186 #define SIGND1(fp)      ((fp >> 32) & 0x80000000)
 187
 188 static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)
 189 {
 190     int e;
 191     /* mantissa */
 192     p->mant = (MANTD1(temp) << 11) | (1LL << 63);
 193     /* exponent + sign */
 194     e = EXPD1(temp) - EXPBIAS1 + 16383;
 195     e |= SIGND1(temp) >> 16;
 196     p->exp = e;
 197 }
 198 #endif
 199
 200 int cpu_load(QEMUFile *f, void *opaque, int version_id)
 201 {
 202     CPUState *env = opaque;
 203     int i, guess_mmx;
 204     uint32_t hflags;
 205     uint16_t fpus, fpuc, fptag, fpregs_format;
 206     int32_t a20_mask;
 207     int32_t pending_irq;
 208
 209     if (version_id < 3 || version_id > CPU_SAVE_VERSION)
 210         return -EINVAL;
 211     for(i = 0; i < CPU_NB_REGS; i++)
 212         qemu_get_betls(f, &env->regs[i]);
 213     qemu_get_betls(f, &env->eip);
 214     qemu_get_betls(f, &env->eflags);
 215     qemu_get_be32s(f, &hflags);
 216
 217     qemu_get_be16s(f, &fpuc);
 218     qemu_get_be16s(f, &fpus);
 219     qemu_get_be16s(f, &fptag);
 220     qemu_get_be16s(f, &fpregs_format);
 221
 222     /* NOTE: we cannot always restore the FPU state if the image come
 223        from a host with a different 'USE_X86LDOUBLE' define. We guess
 224        if we are in an MMX state to restore correctly in that case. */
 225     guess_mmx = ((fptag == 0xff) && (fpus & 0x3800) == 0);
 226     for(i = 0; i < 8; i++) {
 227         uint64_t mant;
 228         uint16_t exp;
 229
 230         switch(fpregs_format) {
 231         case 0:
 232             mant = qemu_get_be64(f);
 233             exp = qemu_get_be16(f);
 234 #ifdef USE_X86LDOUBLE
 235             env->fpregs[i].d = cpu_set_fp80(mant, exp);
 236 #else
 237             /* difficult case */
 238             if (guess_mmx)
 239                 env->fpregs[i].mmx.MMX_Q(0) = mant;
 240             else
 241                 env->fpregs[i].d = cpu_set_fp80(mant, exp);
 242 #endif
 243             break;
 244         case 1:
 245             mant = qemu_get_be64(f);
 246 #ifdef USE_X86LDOUBLE
 247             {
 248                 union x86_longdouble *p;
 249                 /* difficult case */
 250                 p = (void *)&env->fpregs[i];
 251                 if (guess_mmx) {
 252                     p->mant = mant;
 253                     p->exp = 0xffff;
 254                 } else {
 255                     fp64_to_fp80(p, mant);
 256                 }
 257             }
 258 #else
 259             env->fpregs[i].mmx.MMX_Q(0) = mant;
 260 #endif
 261             break;
 262         default:
 263             return -EINVAL;
 264         }
 265     }
 266
 267     env->fpuc = fpuc;
 268     /* XXX: restore FPU round state */
 269     env->fpstt = (fpus >> 11) & 7;
 270     env->fpus = fpus & ~0x3800;
 271     fptag ^= 0xff;
 272     for(i = 0; i < 8; i++) {
 273         env->fptags[i] = (fptag >> i) & 1;
 274     }
 275
 276     for(i = 0; i < 6; i++)
 277         cpu_get_seg(f, &env->segs[i]);
 278     cpu_get_seg(f, &env->ldt);
 279     cpu_get_seg(f, &env->tr);
 280     cpu_get_seg(f, &env->gdt);
 281     cpu_get_seg(f, &env->idt);
 282
 283     qemu_get_be32s(f, &env->sysenter_cs);
 284     if (version_id >= 7) {
 285         qemu_get_betls(f, &env->sysenter_esp);
 286         qemu_get_betls(f, &env->sysenter_eip);
 287     } else {
 288         env->sysenter_esp = qemu_get_be32(f);
 289         env->sysenter_eip = qemu_get_be32(f);
 290     }
 291
 292     qemu_get_betls(f, &env->cr[0]);
 293     qemu_get_betls(f, &env->cr[2]);
 294     qemu_get_betls(f, &env->cr[3]);
 295     qemu_get_betls(f, &env->cr[4]);
 296
 297     for(i = 0; i < 8; i++)
 298         qemu_get_betls(f, &env->dr[i]);
 299     cpu_breakpoint_remove_all(env, BP_CPU);
 300     cpu_watchpoint_remove_all(env, BP_CPU);
 301     for (i = 0; i < 4; i++)
 302         hw_breakpoint_insert(env, i);
 303
 304     /* MMU */
 305     qemu_get_sbe32s(f, &a20_mask);
 306     env->a20_mask = a20_mask;
 307
 308     qemu_get_be32s(f, &env->mxcsr);
 309     for(i = 0; i < CPU_NB_REGS; i++) {
 310         qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(0));
 311         qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(1));
 312     }
 313
 314 #ifdef TARGET_X86_64
 315     qemu_get_be64s(f, &env->efer);
 316     qemu_get_be64s(f, &env->star);
 317     qemu_get_be64s(f, &env->lstar);
 318     qemu_get_be64s(f, &env->cstar);
 319     qemu_get_be64s(f, &env->fmask);
 320     qemu_get_be64s(f, &env->kernelgsbase);
 321 #endif
 322     if (version_id >= 4) {
 323         qemu_get_be32s(f, &env->smbase);
 324     }
 325     if (version_id >= 5) {
 326         qemu_get_be64s(f, &env->pat);
 327         qemu_get_be32s(f, &env->hflags2);
 328         if (version_id < 6)
 329             qemu_get_be32s(f, &env->halted);
 330
 331         qemu_get_be64s(f, &env->vm_hsave);
 332         qemu_get_be64s(f, &env->vm_vmcb);
 333         qemu_get_be64s(f, &env->tsc_offset);
 334         qemu_get_be64s(f, &env->intercept);
 335         qemu_get_be16s(f, &env->intercept_cr_read);
 336         qemu_get_be16s(f, &env->intercept_cr_write);
 337         qemu_get_be16s(f, &env->intercept_dr_read);
 338         qemu_get_be16s(f, &env->intercept_dr_write);
 339         qemu_get_be32s(f, &env->intercept_exceptions);
 340         qemu_get_8s(f, &env->v_tpr);
 341     }
 342
 343     if (version_id >= 8) {
 344         /* MTRRs */
 345         for(i = 0; i < 11; i++)
 346             qemu_get_be64s(f, &env->mtrr_fixed[i]);
 347         qemu_get_be64s(f, &env->mtrr_deftype);
 348         for(i = 0; i < 8; i++) {
 349             qemu_get_be64s(f, &env->mtrr_var[i].base);
 350             qemu_get_be64s(f, &env->mtrr_var[i].mask);
 351         }
 352     }
 353
 354     if (version_id >= 9) {
 355         qemu_get_sbe32s(f, &pending_irq);
 356         memset(&env->interrupt_bitmap, 0, sizeof(env->interrupt_bitmap));
 357         if (pending_irq >= 0) {
 358             env->interrupt_bitmap[pending_irq / 64] |=
 359                 (uint64_t)1 << (pending_irq % 64);
 360         }
 361         qemu_get_be32s(f, &env->mp_state);
 362         qemu_get_be64s(f, &env->tsc);
 363     }
 364
 365     if (version_id >= 10) {
 366         qemu_get_be64s(f, &env->mcg_cap);
 367         if (env->mcg_cap) {
 368             qemu_get_be64s(f, &env->mcg_status);
 369             qemu_get_be64s(f, &env->mcg_ctl);
 370             for (i = 0; i < (env->mcg_cap & 0xff); i++) {
 371                 qemu_get_be64s(f, &env->mce_banks[4*i]);
 372                 qemu_get_be64s(f, &env->mce_banks[4*i + 1]);
 373                 qemu_get_be64s(f, &env->mce_banks[4*i + 2]);
 374                 qemu_get_be64s(f, &env->mce_banks[4*i + 3]);
 375             }
 376         }
 377     }
 378
 379     /* XXX: ensure compatiblity for halted bit ? */
 380     /* XXX: compute redundant hflags bits */
 381     env->hflags = hflags;
 382     tlb_flush(env, 1);
 383     cpu_synchronize_state(env, 1);
 384     return 0;
 385 }