Archipelago » qemu

#include "hw/hw.h"

#include "hw/boards.h"

#include "hw/pc.h"

#include "hw/isa.h"

#include "exec-all.h"

#include "kvm.h"

static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)

{

    qemu_put_be32(f, dt->selector);

    qemu_put_betl(f, dt->base);

    qemu_put_be32(f, dt->limit);

    qemu_put_be32(f, dt->flags);

}

static void cpu_get_seg(QEMUFile *f, SegmentCache *dt)

{

    dt->selector = qemu_get_be32(f);

    dt->base = qemu_get_betl(f);

    dt->limit = qemu_get_be32(f);

    dt->flags = qemu_get_be32(f);

}

void cpu_save(QEMUFile *f, void *opaque)

{

    CPUState *env = opaque;

    uint16_t fptag, fpus, fpuc, fpregs_format;

    uint32_t hflags;

    int32_t a20_mask;

    int i;

    cpu_synchronize_state(env, 0);

    for(i = 0; i < CPU_NB_REGS; i++)

        qemu_put_betls(f, &env->regs[i]);

    qemu_put_betls(f, &env->eip);

    qemu_put_betls(f, &env->eflags);

    hflags = env->hflags; /* XXX: suppress most of the redundant hflags */

    qemu_put_be32s(f, &hflags);

    /* FPU */

    fpuc = env->fpuc;

    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;

    fptag = 0;

    for(i = 0; i < 8; i++) {

        fptag |= ((!env->fptags[i]) << i);

    }

    qemu_put_be16s(f, &fpuc);

    qemu_put_be16s(f, &fpus);

    qemu_put_be16s(f, &fptag);

#ifdef USE_X86LDOUBLE

    fpregs_format = 0;

#else

    fpregs_format = 1;

#endif

    qemu_put_be16s(f, &fpregs_format);

    for(i = 0; i < 8; i++) {

#ifdef USE_X86LDOUBLE

        {

            uint64_t mant;

            uint16_t exp;

            /* we save the real CPU data (in case of MMX usage only 'mant'

               contains the MMX register */

            cpu_get_fp80(&mant, &exp, env->fpregs[i].d);

            qemu_put_be64(f, mant);

            qemu_put_be16(f, exp);

        }

#else

        /* if we use doubles for float emulation, we save the doubles to

           avoid losing information in case of MMX usage. It can give

           problems if the image is restored on a CPU where long

           doubles are used instead. */

        qemu_put_be64(f, env->fpregs[i].mmx.MMX_Q(0));

#endif

    }

    for(i = 0; i < 6; i++)

        cpu_put_seg(f, &env->segs[i]);

    cpu_put_seg(f, &env->ldt);

    cpu_put_seg(f, &env->tr);

    cpu_put_seg(f, &env->gdt);

    cpu_put_seg(f, &env->idt);

    qemu_put_be32s(f, &env->sysenter_cs);

    qemu_put_betls(f, &env->sysenter_esp);

    qemu_put_betls(f, &env->sysenter_eip);

    qemu_put_betls(f, &env->cr[0]);

    qemu_put_betls(f, &env->cr[2]);

    qemu_put_betls(f, &env->cr[3]);

    qemu_put_betls(f, &env->cr[4]);

    for(i = 0; i < 8; i++)

        qemu_put_betls(f, &env->dr[i]);

    /* MMU */

    a20_mask = (int32_t) env->a20_mask;

    qemu_put_sbe32s(f, &a20_mask);

    /* XMM */

    qemu_put_be32s(f, &env->mxcsr);

    for(i = 0; i < CPU_NB_REGS; i++) {

        qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(0));

        qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(1));

    }

#ifdef TARGET_X86_64

    qemu_put_be64s(f, &env->efer);

    qemu_put_be64s(f, &env->star);

    qemu_put_be64s(f, &env->lstar);

    qemu_put_be64s(f, &env->cstar);

    qemu_put_be64s(f, &env->fmask);

    qemu_put_be64s(f, &env->kernelgsbase);

#endif

    qemu_put_be32s(f, &env->smbase);

    qemu_put_be64s(f, &env->pat);

    qemu_put_be32s(f, &env->hflags2);

    qemu_put_be64s(f, &env->vm_hsave);

    qemu_put_be64s(f, &env->vm_vmcb);

    qemu_put_be64s(f, &env->tsc_offset);

    qemu_put_be64s(f, &env->intercept);

    qemu_put_be16s(f, &env->intercept_cr_read);

    qemu_put_be16s(f, &env->intercept_cr_write);

    qemu_put_be16s(f, &env->intercept_dr_read);

    qemu_put_be16s(f, &env->intercept_dr_write);

    qemu_put_be32s(f, &env->intercept_exceptions);

    qemu_put_8s(f, &env->v_tpr);

    /* MTRRs */

    for(i = 0; i < 11; i++)

        qemu_put_be64s(f, &env->mtrr_fixed[i]);

    qemu_put_be64s(f, &env->mtrr_deftype);

    for(i = 0; i < 8; i++) {

        qemu_put_be64s(f, &env->mtrr_var[i].base);

        qemu_put_be64s(f, &env->mtrr_var[i].mask);

    }

}

#ifdef USE_X86LDOUBLE

/* XXX: add that in a FPU generic layer */

union x86_longdouble {

    uint64_t mant;

    uint16_t exp;

};

#define MANTD1(fp)        (fp & ((1LL << 52) - 1))

#define EXPBIAS1 1023

#define EXPD1(fp)        ((fp >> 52) & 0x7FF)

#define SIGND1(fp)        ((fp >> 32) & 0x80000000)

static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)

{

    int e;

    /* mantissa */

    p->mant = (MANTD1(temp) << 11) | (1LL << 63);

    /* exponent + sign */

    e = EXPD1(temp) - EXPBIAS1 + 16383;

    e |= SIGND1(temp) >> 16;

    p->exp = e;

}

#endif

int cpu_load(QEMUFile *f, void *opaque, int version_id)

{

    CPUState *env = opaque;

    int i, guess_mmx;

    uint32_t hflags;

    uint16_t fpus, fpuc, fptag, fpregs_format;

    int32_t a20_mask;

    if (version_id != 3 && version_id != 4 && version_id != 5

        && version_id != 6 && version_id != 7 && version_id != 8)

        return -EINVAL;

    for(i = 0; i < CPU_NB_REGS; i++)

        qemu_get_betls(f, &env->regs[i]);

    qemu_get_betls(f, &env->eip);

    qemu_get_betls(f, &env->eflags);

    qemu_get_be32s(f, &hflags);

    qemu_get_be16s(f, &fpuc);

    qemu_get_be16s(f, &fpus);

    qemu_get_be16s(f, &fptag);

    qemu_get_be16s(f, &fpregs_format);

    /* NOTE: we cannot always restore the FPU state if the image come

       from a host with a different 'USE_X86LDOUBLE' define. We guess

       if we are in an MMX state to restore correctly in that case. */

    guess_mmx = ((fptag == 0xff) && (fpus & 0x3800) == 0);

    for(i = 0; i < 8; i++) {

        uint64_t mant;

        uint16_t exp;

        switch(fpregs_format) {

        case 0:

            mant = qemu_get_be64(f);

            exp = qemu_get_be16(f);

#ifdef USE_X86LDOUBLE

            env->fpregs[i].d = cpu_set_fp80(mant, exp);

#else

            /* difficult case */

            if (guess_mmx)

                env->fpregs[i].mmx.MMX_Q(0) = mant;

            else

                env->fpregs[i].d = cpu_set_fp80(mant, exp);

#endif

            break;

        case 1:

            mant = qemu_get_be64(f);

#ifdef USE_X86LDOUBLE

            {

                union x86_longdouble *p;

                /* difficult case */

                p = (void *)&env->fpregs[i];

                if (guess_mmx) {

                    p->mant = mant;

                    p->exp = 0xffff;

                } else {

                    fp64_to_fp80(p, mant);

                }

            }

#else

            env->fpregs[i].mmx.MMX_Q(0) = mant;

#endif

            break;

        default:

            return -EINVAL;

        }

    }

    env->fpuc = fpuc;

    /* XXX: restore FPU round state */

    env->fpstt = (fpus >> 11) & 7;

    env->fpus = fpus & ~0x3800;

    fptag ^= 0xff;

    for(i = 0; i < 8; i++) {

        env->fptags[i] = (fptag >> i) & 1;

    }

    for(i = 0; i < 6; i++)

        cpu_get_seg(f, &env->segs[i]);

    cpu_get_seg(f, &env->ldt);

    cpu_get_seg(f, &env->tr);

    cpu_get_seg(f, &env->gdt);

    cpu_get_seg(f, &env->idt);

    qemu_get_be32s(f, &env->sysenter_cs);

    if (version_id >= 7) {

        qemu_get_betls(f, &env->sysenter_esp);

        qemu_get_betls(f, &env->sysenter_eip);

    } else {

        env->sysenter_esp = qemu_get_be32(f);

        env->sysenter_eip = qemu_get_be32(f);

    }

    qemu_get_betls(f, &env->cr[0]);

    qemu_get_betls(f, &env->cr[2]);

    qemu_get_betls(f, &env->cr[3]);

    qemu_get_betls(f, &env->cr[4]);

    for(i = 0; i < 8; i++)

        qemu_get_betls(f, &env->dr[i]);

    cpu_breakpoint_remove_all(env, BP_CPU);

    cpu_watchpoint_remove_all(env, BP_CPU);

    for (i = 0; i < 4; i++)

        hw_breakpoint_insert(env, i);

    /* MMU */

    qemu_get_sbe32s(f, &a20_mask);

    env->a20_mask = a20_mask;

    qemu_get_be32s(f, &env->mxcsr);

    for(i = 0; i < CPU_NB_REGS; i++) {

        qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(0));

        qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(1));

    }

#ifdef TARGET_X86_64

    qemu_get_be64s(f, &env->efer);

    qemu_get_be64s(f, &env->star);

    qemu_get_be64s(f, &env->lstar);

    qemu_get_be64s(f, &env->cstar);

    qemu_get_be64s(f, &env->fmask);

    qemu_get_be64s(f, &env->kernelgsbase);

#endif

    if (version_id >= 4) {

        qemu_get_be32s(f, &env->smbase);

    }

    if (version_id >= 5) {

        qemu_get_be64s(f, &env->pat);

        qemu_get_be32s(f, &env->hflags2);

        if (version_id < 6)

            qemu_get_be32s(f, &env->halted);

        qemu_get_be64s(f, &env->vm_hsave);

        qemu_get_be64s(f, &env->vm_vmcb);

        qemu_get_be64s(f, &env->tsc_offset);

        qemu_get_be64s(f, &env->intercept);

        qemu_get_be16s(f, &env->intercept_cr_read);

        qemu_get_be16s(f, &env->intercept_cr_write);

        qemu_get_be16s(f, &env->intercept_dr_read);

        qemu_get_be16s(f, &env->intercept_dr_write);

        qemu_get_be32s(f, &env->intercept_exceptions);

        qemu_get_8s(f, &env->v_tpr);

    }

    if (version_id >= 8) {

        /* MTRRs */

        for(i = 0; i < 11; i++)

            qemu_get_be64s(f, &env->mtrr_fixed[i]);

        qemu_get_be64s(f, &env->mtrr_deftype);

        for(i = 0; i < 8; i++) {

            qemu_get_be64s(f, &env->mtrr_var[i].base);

            qemu_get_be64s(f, &env->mtrr_var[i].mask);

        }

    }

    /* XXX: ensure compatiblity for halted bit ? */

    /* XXX: compute redundant hflags bits */

    env->hflags = hflags;

    tlb_flush(env, 1);

    cpu_synchronize_state(env, 1);

    return 0;

}