/*
 *  i386 helpers
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
 */
#define CPU_NO_GLOBAL_REGS
#include "exec.h"
#include "exec-all.h"
#include "host-utils.h"

//#define DEBUG_PCALL


#ifdef DEBUG_PCALL
#  define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__)
#  define LOG_PCALL_STATE(env) \
          log_cpu_state_mask(CPU_LOG_PCALL, (env), X86_DUMP_CCOP)
#else
#  define LOG_PCALL(...) do { } while (0)
#  define LOG_PCALL_STATE(env) do { } while (0)
#endif


#if 0
#define raise_exception_err(a, b)\
do {\
    qemu_log("raise_exception line=%d\n", __LINE__);\
    (raise_exception_err)(a, b);\
} while (0)
#endif

static const uint8_t parity_table[256] = {
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    CC_P, 0, 0, CC_P, 0, CC_P, CC_P, 0,
    0, CC_P, CC_P, 0, CC_P, 0, 0, CC_P,
};

/* modulo 17 table */
static const uint8_t rclw_table[32] = {
    0, 1, 2, 3, 4, 5, 6, 7,
    8, 9,10,11,12,13,14,15,
   16, 0, 1, 2, 3, 4, 5, 6,
    7, 8, 9,10,11,12,13,14,
};

/* modulo 9 table */
static const uint8_t rclb_table[32] = {
    0, 1, 2, 3, 4, 5, 6, 7,
    8, 0, 1, 2, 3, 4, 5, 6,
    7, 8, 0, 1, 2, 3, 4, 5,
    6, 7, 8, 0, 1, 2, 3, 4,
};

static const CPU86_LDouble f15rk[7] =
{
    0.00000000000000000000L,
    1.00000000000000000000L,
    3.14159265358979323851L,  /*pi*/
    0.30102999566398119523L,  /*lg2*/
    0.69314718055994530943L,  /*ln2*/
    1.44269504088896340739L,  /*l2e*/
    3.32192809488736234781L,  /*l2t*/
};

/* broken thread support */

static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;

void helper_lock(void)
{
    spin_lock(&global_cpu_lock);
}

void helper_unlock(void)
{
    spin_unlock(&global_cpu_lock);
}

void helper_write_eflags(target_ulong t0, uint32_t update_mask)
{
    load_eflags(t0, update_mask);
}

target_ulong helper_read_eflags(void)
{
    uint32_t eflags;
    eflags = helper_cc_compute_all(CC_OP);
    eflags |= (DF & DF_MASK);
    eflags |= env->eflags & ~(VM_MASK | RF_MASK);
    return eflags;
}

/* return non zero if error */
static inline int load_segment(uint32_t *e1_ptr, uint32_t *e2_ptr,
                               int selector)
{
    SegmentCache *dt;
    int index;
    target_ulong ptr;

    if (selector & 0x4)
        dt = &env->ldt;
    else
        dt = &env->gdt;
    index = selector & ~7;
    if ((index + 7) > dt->limit)
        return -1;
    ptr = dt->base + index;
    *e1_ptr = ldl_kernel(ptr);
    *e2_ptr = ldl_kernel(ptr + 4);
    return 0;
}

static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
{
    unsigned int limit;
    limit = (e1 & 0xffff) | (e2 & 0x000f0000);
    if (e2 & DESC_G_MASK)
        limit = (limit << 12) | 0xfff;
    return limit;
}

static inline uint32_t get_seg_base(uint32_t e1, uint32_t e2)
{
    return ((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
}

static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1, uint32_t e2)
{
    sc->base = get_seg_base(e1, e2);
    sc->limit = get_seg_limit(e1, e2);
    sc->flags = e2;
}

/* init the segment cache in vm86 mode. */
static inline void load_seg_vm(int seg, int selector)
{
    selector &= 0xffff;
    cpu_x86_load_seg_cache(env, seg, selector,
                           (selector << 4), 0xffff, 0);
}

static inline void get_ss_esp_from_tss(uint32_t *ss_ptr,
                                       uint32_t *esp_ptr, int dpl)
{
    int type, index, shift;

#if 0
    {
        int i;
        printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit);
        for(i=0;i<env->tr.limit;i++) {
            printf("%02x ", env->tr.base[i]);
            if ((i & 7) == 7) printf("\n");
        }
        printf("\n");
    }
#endif

    if (!(env->tr.flags & DESC_P_MASK))
        cpu_abort(env, "invalid tss");
    type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
    if ((type & 7) != 1)
        cpu_abort(env, "invalid tss type");
    shift = type >> 3;
    index = (dpl * 4 + 2) << shift;
    if (index + (4 << shift) - 1 > env->tr.limit)
        raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
    if (shift == 0) {
        *esp_ptr = lduw_kernel(env->tr.base + index);
        *ss_ptr = lduw_kernel(env->tr.base + index + 2);
    } else {
        *esp_ptr = ldl_kernel(env->tr.base + index);
        *ss_ptr = lduw_kernel(env->tr.base + index + 4);
    }
}

/* XXX: merge with load_seg() */
static void tss_load_seg(int seg_reg, int selector)
{
    uint32_t e1, e2;
    int rpl, dpl, cpl;

    if ((selector & 0xfffc) != 0) {
        if (load_segment(&e1, &e2, selector) != 0)
            raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
        if (!(e2 & DESC_S_MASK))
            raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
        rpl = selector & 3;
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        cpl = env->hflags & HF_CPL_MASK;
        if (seg_reg == R_CS) {
            if (!(e2 & DESC_CS_MASK))
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
            /* XXX: is it correct ? */
            if (dpl != rpl)
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
            if ((e2 & DESC_C_MASK) && dpl > rpl)
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
        } else if (seg_reg == R_SS) {
            /* SS must be writable data */
            if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
            if (dpl != cpl || dpl != rpl)
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
        } else {
            /* not readable code */
            if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK))
                raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
            /* if data or non conforming code, checks the rights */
            if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
                if (dpl < cpl || dpl < rpl)
                    raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
            }
        }
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
        cpu_x86_load_seg_cache(env, seg_reg, selector,
                       get_seg_base(e1, e2),
                       get_seg_limit(e1, e2),
                       e2);
    } else {
        if (seg_reg == R_SS || seg_reg == R_CS)
            raise_exception_err(EXCP0A_TSS, selector & 0xfffc);
    }
}

#define SWITCH_TSS_JMP  0
#define SWITCH_TSS_IRET 1
#define SWITCH_TSS_CALL 2

/* XXX: restore CPU state in registers (PowerPC case) */
static void switch_tss(int tss_selector,
                       uint32_t e1, uint32_t e2, int source,
                       uint32_t next_eip)
{
    int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i;
    target_ulong tss_base;
    uint32_t new_regs[8], new_segs[6];
    uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap;
    uint32_t old_eflags, eflags_mask;
    SegmentCache *dt;
    int index;
    target_ulong ptr;

    type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
    LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type, source);

    /* if task gate, we read the TSS segment and we load it */
    if (type == 5) {
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);
        tss_selector = e1 >> 16;
        if (tss_selector & 4)
            raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
        if (load_segment(&e1, &e2, tss_selector) != 0)
            raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
        if (e2 & DESC_S_MASK)
            raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
        type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
        if ((type & 7) != 1)
            raise_exception_err(EXCP0D_GPF, tss_selector & 0xfffc);
    }

    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, tss_selector & 0xfffc);

    if (type & 8)
        tss_limit_max = 103;
    else
        tss_limit_max = 43;
    tss_limit = get_seg_limit(e1, e2);
    tss_base = get_seg_base(e1, e2);
    if ((tss_selector & 4) != 0 ||
        tss_limit < tss_limit_max)
        raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
    old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
    if (old_type & 8)
        old_tss_limit_max = 103;
    else
        old_tss_limit_max = 43;

    /* read all the registers from the new TSS */
    if (type & 8) {
        /* 32 bit */
        new_cr3 = ldl_kernel(tss_base + 0x1c);
        new_eip = ldl_kernel(tss_base + 0x20);
        new_eflags = ldl_kernel(tss_base + 0x24);
        for(i = 0; i < 8; i++)
            new_regs[i] = ldl_kernel(tss_base + (0x28 + i * 4));
        for(i = 0; i < 6; i++)
            new_segs[i] = lduw_kernel(tss_base + (0x48 + i * 4));
        new_ldt = lduw_kernel(tss_base + 0x60);
        new_trap = ldl_kernel(tss_base + 0x64);
    } else {
        /* 16 bit */
        new_cr3 = 0;
        new_eip = lduw_kernel(tss_base + 0x0e);
        new_eflags = lduw_kernel(tss_base + 0x10);
        for(i = 0; i < 8; i++)
            new_regs[i] = lduw_kernel(tss_base + (0x12 + i * 2)) | 0xffff0000;
        for(i = 0; i < 4; i++)
            new_segs[i] = lduw_kernel(tss_base + (0x22 + i * 4));
        new_ldt = lduw_kernel(tss_base + 0x2a);
        new_segs[R_FS] = 0;
        new_segs[R_GS] = 0;
        new_trap = 0;
    }

    /* NOTE: we must avoid memory exceptions during the task switch,
       so we make dummy accesses before */
    /* XXX: it can still fail in some cases, so a bigger hack is
       necessary to valid the TLB after having done the accesses */

    v1 = ldub_kernel(env->tr.base);
    v2 = ldub_kernel(env->tr.base + old_tss_limit_max);
    stb_kernel(env->tr.base, v1);
    stb_kernel(env->tr.base + old_tss_limit_max, v2);

    /* clear busy bit (it is restartable) */
    if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
        target_ulong ptr;
        uint32_t e2;
        ptr = env->gdt.base + (env->tr.selector & ~7);
        e2 = ldl_kernel(ptr + 4);
        e2 &= ~DESC_TSS_BUSY_MASK;
        stl_kernel(ptr + 4, e2);
    }
    old_eflags = compute_eflags();
    if (source == SWITCH_TSS_IRET)
        old_eflags &= ~NT_MASK;

    /* save the current state in the old TSS */
    if (type & 8) {
        /* 32 bit */
        stl_kernel(env->tr.base + 0x20, next_eip);
        stl_kernel(env->tr.base + 0x24, old_eflags);
        stl_kernel(env->tr.base + (0x28 + 0 * 4), EAX);
        stl_kernel(env->tr.base + (0x28 + 1 * 4), ECX);
        stl_kernel(env->tr.base + (0x28 + 2 * 4), EDX);
        stl_kernel(env->tr.base + (0x28 + 3 * 4), EBX);
        stl_kernel(env->tr.base + (0x28 + 4 * 4), ESP);
        stl_kernel(env->tr.base + (0x28 + 5 * 4), EBP);
        stl_kernel(env->tr.base + (0x28 + 6 * 4), ESI);
        stl_kernel(env->tr.base + (0x28 + 7 * 4), EDI);
        for(i = 0; i < 6; i++)
            stw_kernel(env->tr.base + (0x48 + i * 4), env->segs[i].selector);
    } else {
        /* 16 bit */
        stw_kernel(env->tr.base + 0x0e, next_eip);
        stw_kernel(env->tr.base + 0x10, old_eflags);
        stw_kernel(env->tr.base + (0x12 + 0 * 2), EAX);
        stw_kernel(env->tr.base + (0x12 + 1 * 2), ECX);
        stw_kernel(env->tr.base + (0x12 + 2 * 2), EDX);
        stw_kernel(env->tr.base + (0x12 + 3 * 2), EBX);
        stw_kernel(env->tr.base + (0x12 + 4 * 2), ESP);
        stw_kernel(env->tr.base + (0x12 + 5 * 2), EBP);
        stw_kernel(env->tr.base + (0x12 + 6 * 2), ESI);
        stw_kernel(env->tr.base + (0x12 + 7 * 2), EDI);
        for(i = 0; i < 4; i++)
            stw_kernel(env->tr.base + (0x22 + i * 4), env->segs[i].selector);
    }

    /* now if an exception occurs, it will occurs in the next task
       context */

    if (source == SWITCH_TSS_CALL) {
        stw_kernel(tss_base, env->tr.selector);
        new_eflags |= NT_MASK;
    }

    /* set busy bit */
    if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
        target_ulong ptr;
        uint32_t e2;
        ptr = env->gdt.base + (tss_selector & ~7);
        e2 = ldl_kernel(ptr + 4);
        e2 |= DESC_TSS_BUSY_MASK;
        stl_kernel(ptr + 4, e2);
    }

    /* set the new CPU state */
    /* from this point, any exception which occurs can give problems */
    env->cr[0] |= CR0_TS_MASK;
    env->hflags |= HF_TS_MASK;
    env->tr.selector = tss_selector;
    env->tr.base = tss_base;
    env->tr.limit = tss_limit;
    env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK;

    if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) {
        cpu_x86_update_cr3(env, new_cr3);
    }

    /* load all registers without an exception, then reload them with
       possible exception */
    env->eip = new_eip;
    eflags_mask = TF_MASK | AC_MASK | ID_MASK |
        IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK;
    if (!(type & 8))
        eflags_mask &= 0xffff;
    load_eflags(new_eflags, eflags_mask);
    /* XXX: what to do in 16 bit case ? */
    EAX = new_regs[0];
    ECX = new_regs[1];
    EDX = new_regs[2];
    EBX = new_regs[3];
    ESP = new_regs[4];
    EBP = new_regs[5];
    ESI = new_regs[6];
    EDI = new_regs[7];
    if (new_eflags & VM_MASK) {
        for(i = 0; i < 6; i++)
            load_seg_vm(i, new_segs[i]);
        /* in vm86, CPL is always 3 */
        cpu_x86_set_cpl(env, 3);
    } else {
        /* CPL is set the RPL of CS */
        cpu_x86_set_cpl(env, new_segs[R_CS] & 3);
        /* first just selectors as the rest may trigger exceptions */
        for(i = 0; i < 6; i++)
            cpu_x86_load_seg_cache(env, i, new_segs[i], 0, 0, 0);
    }

    env->ldt.selector = new_ldt & ~4;
    env->ldt.base = 0;
    env->ldt.limit = 0;
    env->ldt.flags = 0;

    /* load the LDT */
    if (new_ldt & 4)
        raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);

    if ((new_ldt & 0xfffc) != 0) {
        dt = &env->gdt;
        index = new_ldt & ~7;
        if ((index + 7) > dt->limit)
            raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
        ptr = dt->base + index;
        e1 = ldl_kernel(ptr);
        e2 = ldl_kernel(ptr + 4);
        if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
            raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0A_TSS, new_ldt & 0xfffc);
        load_seg_cache_raw_dt(&env->ldt, e1, e2);
    }

    /* load the segments */
    if (!(new_eflags & VM_MASK)) {
        tss_load_seg(R_CS, new_segs[R_CS]);
        tss_load_seg(R_SS, new_segs[R_SS]);
        tss_load_seg(R_ES, new_segs[R_ES]);
        tss_load_seg(R_DS, new_segs[R_DS]);
        tss_load_seg(R_FS, new_segs[R_FS]);
        tss_load_seg(R_GS, new_segs[R_GS]);
    }

    /* check that EIP is in the CS segment limits */
    if (new_eip > env->segs[R_CS].limit) {
        /* XXX: different exception if CALL ? */
        raise_exception_err(EXCP0D_GPF, 0);
    }

#ifndef CONFIG_USER_ONLY
    /* reset local breakpoints */
    if (env->dr[7] & 0x55) {
        for (i = 0; i < 4; i++) {
            if (hw_breakpoint_enabled(env->dr[7], i) == 0x1)
                hw_breakpoint_remove(env, i);
        }
        env->dr[7] &= ~0x55;
    }
#endif
}

/* check if Port I/O is allowed in TSS */
static inline void check_io(int addr, int size)
{
    int io_offset, val, mask;

    /* TSS must be a valid 32 bit one */
    if (!(env->tr.flags & DESC_P_MASK) ||
        ((env->tr.flags >> DESC_TYPE_SHIFT) & 0xf) != 9 ||
        env->tr.limit < 103)
        goto fail;
    io_offset = lduw_kernel(env->tr.base + 0x66);
    io_offset += (addr >> 3);
    /* Note: the check needs two bytes */
    if ((io_offset + 1) > env->tr.limit)
        goto fail;
    val = lduw_kernel(env->tr.base + io_offset);
    val >>= (addr & 7);
    mask = (1 << size) - 1;
    /* all bits must be zero to allow the I/O */
    if ((val & mask) != 0) {
    fail:
        raise_exception_err(EXCP0D_GPF, 0);
    }
}

void helper_check_iob(uint32_t t0)
{
    check_io(t0, 1);
}

void helper_check_iow(uint32_t t0)
{
    check_io(t0, 2);
}

void helper_check_iol(uint32_t t0)
{
    check_io(t0, 4);
}

void helper_outb(uint32_t port, uint32_t data)
{
    cpu_outb(env, port, data & 0xff);
}

target_ulong helper_inb(uint32_t port)
{
    return cpu_inb(env, port);
}

void helper_outw(uint32_t port, uint32_t data)
{
    cpu_outw(env, port, data & 0xffff);
}

target_ulong helper_inw(uint32_t port)
{
    return cpu_inw(env, port);
}

void helper_outl(uint32_t port, uint32_t data)
{
    cpu_outl(env, port, data);
}

target_ulong helper_inl(uint32_t port)
{
    return cpu_inl(env, port);
}

static inline unsigned int get_sp_mask(unsigned int e2)
{
    if (e2 & DESC_B_MASK)
        return 0xffffffff;
    else
        return 0xffff;
}

#ifdef TARGET_X86_64
#define SET_ESP(val, sp_mask)\
do {\
    if ((sp_mask) == 0xffff)\
        ESP = (ESP & ~0xffff) | ((val) & 0xffff);\
    else if ((sp_mask) == 0xffffffffLL)\
        ESP = (uint32_t)(val);\
    else\
        ESP = (val);\
} while (0)
#else
#define SET_ESP(val, sp_mask) ESP = (ESP & ~(sp_mask)) | ((val) & (sp_mask))
#endif

/* in 64-bit machines, this can overflow. So this segment addition macro
 * can be used to trim the value to 32-bit whenever needed */
#define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask))))

/* XXX: add a is_user flag to have proper security support */
#define PUSHW(ssp, sp, sp_mask, val)\
{\
    sp -= 2;\
    stw_kernel((ssp) + (sp & (sp_mask)), (val));\
}

#define PUSHL(ssp, sp, sp_mask, val)\
{\
    sp -= 4;\
    stl_kernel(SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val));\
}

#define POPW(ssp, sp, sp_mask, val)\
{\
    val = lduw_kernel((ssp) + (sp & (sp_mask)));\
    sp += 2;\
}

#define POPL(ssp, sp, sp_mask, val)\
{\
    val = (uint32_t)ldl_kernel(SEG_ADDL(ssp, sp, sp_mask));\
    sp += 4;\
}

/* protected mode interrupt */
static void do_interrupt_protected(int intno, int is_int, int error_code,
                                   unsigned int next_eip, int is_hw)
{
    SegmentCache *dt;
    target_ulong ptr, ssp;
    int type, dpl, selector, ss_dpl, cpl;
    int has_error_code, new_stack, shift;
    uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0;
    uint32_t old_eip, sp_mask;

    has_error_code = 0;
    if (!is_int && !is_hw) {
        switch(intno) {
        case 8:
        case 10:
        case 11:
        case 12:
        case 13:
        case 14:
        case 17:
            has_error_code = 1;
            break;
        }
    }
    if (is_int)
        old_eip = next_eip;
    else
        old_eip = env->eip;

    dt = &env->idt;
    if (intno * 8 + 7 > dt->limit)
        raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
    ptr = dt->base + intno * 8;
    e1 = ldl_kernel(ptr);
    e2 = ldl_kernel(ptr + 4);
    /* check gate type */
    type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
    switch(type) {
    case 5: /* task gate */
        /* must do that check here to return the correct error code */
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2);
        switch_tss(intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip);
        if (has_error_code) {
            int type;
            uint32_t mask;
            /* push the error code */
            type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
            shift = type >> 3;
            if (env->segs[R_SS].flags & DESC_B_MASK)
                mask = 0xffffffff;
            else
                mask = 0xffff;
            esp = (ESP - (2 << shift)) & mask;
            ssp = env->segs[R_SS].base + esp;
            if (shift)
                stl_kernel(ssp, error_code);
            else
                stw_kernel(ssp, error_code);
            SET_ESP(esp, mask);
        }
        return;
    case 6: /* 286 interrupt gate */
    case 7: /* 286 trap gate */
    case 14: /* 386 interrupt gate */
    case 15: /* 386 trap gate */
        break;
    default:
        raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
        break;
    }
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    /* check privilege if software int */
    if (is_int && dpl < cpl)
        raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
    /* check valid bit */
    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, intno * 8 + 2);
    selector = e1 >> 16;
    offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
    if ((selector & 0xfffc) == 0)
        raise_exception_err(EXCP0D_GPF, 0);

    if (load_segment(&e1, &e2, selector) != 0)
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    if (dpl > cpl)
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
    if (!(e2 & DESC_C_MASK) && dpl < cpl) {
        /* to inner privilege */
        get_ss_esp_from_tss(&ss, &esp, dpl);
        if ((ss & 0xfffc) == 0)
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        if ((ss & 3) != dpl)
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        if (load_segment(&ss_e1, &ss_e2, ss) != 0)
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
        if (ss_dpl != dpl)
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        if (!(ss_e2 & DESC_S_MASK) ||
            (ss_e2 & DESC_CS_MASK) ||
            !(ss_e2 & DESC_W_MASK))
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        if (!(ss_e2 & DESC_P_MASK))
            raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
        new_stack = 1;
        sp_mask = get_sp_mask(ss_e2);
        ssp = get_seg_base(ss_e1, ss_e2);
    } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
        /* to same privilege */
        if (env->eflags & VM_MASK)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        new_stack = 0;
        sp_mask = get_sp_mask(env->segs[R_SS].flags);
        ssp = env->segs[R_SS].base;
        esp = ESP;
        dpl = cpl;
    } else {
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        new_stack = 0; /* avoid warning */
        sp_mask = 0; /* avoid warning */
        ssp = 0; /* avoid warning */
        esp = 0; /* avoid warning */
    }

    shift = type >> 3;

#if 0
    /* XXX: check that enough room is available */
    push_size = 6 + (new_stack << 2) + (has_error_code << 1);
    if (env->eflags & VM_MASK)
        push_size += 8;
    push_size <<= shift;
#endif
    if (shift == 1) {
        if (new_stack) {
            if (env->eflags & VM_MASK) {
                PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector);
                PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector);
                PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector);
                PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector);
            }
            PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector);
            PUSHL(ssp, esp, sp_mask, ESP);
        }
        PUSHL(ssp, esp, sp_mask, compute_eflags());
        PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector);
        PUSHL(ssp, esp, sp_mask, old_eip);
        if (has_error_code) {
            PUSHL(ssp, esp, sp_mask, error_code);
        }
    } else {
        if (new_stack) {
            if (env->eflags & VM_MASK) {
                PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector);
                PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector);
                PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector);
                PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector);
            }
            PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector);
            PUSHW(ssp, esp, sp_mask, ESP);
        }
        PUSHW(ssp, esp, sp_mask, compute_eflags());
        PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector);
        PUSHW(ssp, esp, sp_mask, old_eip);
        if (has_error_code) {
            PUSHW(ssp, esp, sp_mask, error_code);
        }
    }

    if (new_stack) {
        if (env->eflags & VM_MASK) {
            cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0, 0);
            cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0);
            cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0);
            cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0, 0);
        }
        ss = (ss & ~3) | dpl;
        cpu_x86_load_seg_cache(env, R_SS, ss,
                               ssp, get_seg_limit(ss_e1, ss_e2), ss_e2);
    }
    SET_ESP(esp, sp_mask);

    selector = (selector & ~3) | dpl;
    cpu_x86_load_seg_cache(env, R_CS, selector,
                   get_seg_base(e1, e2),
                   get_seg_limit(e1, e2),
                   e2);
    cpu_x86_set_cpl(env, dpl);
    env->eip = offset;

    /* interrupt gate clear IF mask */
    if ((type & 1) == 0) {
        env->eflags &= ~IF_MASK;
    }
    env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
}

#ifdef TARGET_X86_64

#define PUSHQ(sp, val)\
{\
    sp -= 8;\
    stq_kernel(sp, (val));\
}

#define POPQ(sp, val)\
{\
    val = ldq_kernel(sp);\
    sp += 8;\
}

static inline target_ulong get_rsp_from_tss(int level)
{
    int index;

#if 0
    printf("TR: base=" TARGET_FMT_lx " limit=%x\n",
           env->tr.base, env->tr.limit);
#endif

    if (!(env->tr.flags & DESC_P_MASK))
        cpu_abort(env, "invalid tss");
    index = 8 * level + 4;
    if ((index + 7) > env->tr.limit)
        raise_exception_err(EXCP0A_TSS, env->tr.selector & 0xfffc);
    return ldq_kernel(env->tr.base + index);
}

/* 64 bit interrupt */
static void do_interrupt64(int intno, int is_int, int error_code,
                           target_ulong next_eip, int is_hw)
{
    SegmentCache *dt;
    target_ulong ptr;
    int type, dpl, selector, cpl, ist;
    int has_error_code, new_stack;
    uint32_t e1, e2, e3, ss;
    target_ulong old_eip, esp, offset;

    has_error_code = 0;
    if (!is_int && !is_hw) {
        switch(intno) {
        case 8:
        case 10:
        case 11:
        case 12:
        case 13:
        case 14:
        case 17:
            has_error_code = 1;
            break;
        }
    }
    if (is_int)
        old_eip = next_eip;
    else
        old_eip = env->eip;

    dt = &env->idt;
    if (intno * 16 + 15 > dt->limit)
        raise_exception_err(EXCP0D_GPF, intno * 16 + 2);
    ptr = dt->base + intno * 16;
    e1 = ldl_kernel(ptr);
    e2 = ldl_kernel(ptr + 4);
    e3 = ldl_kernel(ptr + 8);
    /* check gate type */
    type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
    switch(type) {
    case 14: /* 386 interrupt gate */
    case 15: /* 386 trap gate */
        break;
    default:
        raise_exception_err(EXCP0D_GPF, intno * 16 + 2);
        break;
    }
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    /* check privilege if software int */
    if (is_int && dpl < cpl)
        raise_exception_err(EXCP0D_GPF, intno * 16 + 2);
    /* check valid bit */
    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, intno * 16 + 2);
    selector = e1 >> 16;
    offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff);
    ist = e2 & 7;
    if ((selector & 0xfffc) == 0)
        raise_exception_err(EXCP0D_GPF, 0);

    if (load_segment(&e1, &e2, selector) != 0)
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    if (dpl > cpl)
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
    if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK))
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
    if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) {
        /* to inner privilege */
        if (ist != 0)
            esp = get_rsp_from_tss(ist + 3);
        else
            esp = get_rsp_from_tss(dpl);
        esp &= ~0xfLL; /* align stack */
        ss = 0;
        new_stack = 1;
    } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
        /* to same privilege */
        if (env->eflags & VM_MASK)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        new_stack = 0;
        if (ist != 0)
            esp = get_rsp_from_tss(ist + 3);
        else
            esp = ESP;
        esp &= ~0xfLL; /* align stack */
        dpl = cpl;
    } else {
        raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        new_stack = 0; /* avoid warning */
        esp = 0; /* avoid warning */
    }

    PUSHQ(esp, env->segs[R_SS].selector);
    PUSHQ(esp, ESP);
    PUSHQ(esp, compute_eflags());
    PUSHQ(esp, env->segs[R_CS].selector);
    PUSHQ(esp, old_eip);
    if (has_error_code) {
        PUSHQ(esp, error_code);
    }

    if (new_stack) {
        ss = 0 | dpl;
        cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0);
    }
    ESP = esp;

    selector = (selector & ~3) | dpl;
    cpu_x86_load_seg_cache(env, R_CS, selector,
                   get_seg_base(e1, e2),
                   get_seg_limit(e1, e2),
                   e2);
    cpu_x86_set_cpl(env, dpl);
    env->eip = offset;

    /* interrupt gate clear IF mask */
    if ((type & 1) == 0) {
        env->eflags &= ~IF_MASK;
    }
    env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
}
#endif

#ifdef TARGET_X86_64
#if defined(CONFIG_USER_ONLY)
void helper_syscall(int next_eip_addend)
{
    env->exception_index = EXCP_SYSCALL;
    env->exception_next_eip = env->eip + next_eip_addend;
    cpu_loop_exit();
}
#else
void helper_syscall(int next_eip_addend)
{
    int selector;

    if (!(env->efer & MSR_EFER_SCE)) {
        raise_exception_err(EXCP06_ILLOP, 0);
    }
    selector = (env->star >> 32) & 0xffff;
    if (env->hflags & HF_LMA_MASK) {
        int code64;

        ECX = env->eip + next_eip_addend;
        env->regs[11] = compute_eflags();

        code64 = env->hflags & HF_CS64_MASK;

        cpu_x86_set_cpl(env, 0);
        cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
                           0, 0xffffffff,
                               DESC_G_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | DESC_L_MASK);
        cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_W_MASK | DESC_A_MASK);
        env->eflags &= ~env->fmask;
        load_eflags(env->eflags, 0);
        if (code64)
            env->eip = env->lstar;
        else
            env->eip = env->cstar;
    } else {
        ECX = (uint32_t)(env->eip + next_eip_addend);

        cpu_x86_set_cpl(env, 0);
        cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
                           0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
        cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_W_MASK | DESC_A_MASK);
        env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
        env->eip = (uint32_t)env->star;
    }
}
#endif
#endif

#ifdef TARGET_X86_64
void helper_sysret(int dflag)
{
    int cpl, selector;

    if (!(env->efer & MSR_EFER_SCE)) {
        raise_exception_err(EXCP06_ILLOP, 0);
    }
    cpl = env->hflags & HF_CPL_MASK;
    if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) {
        raise_exception_err(EXCP0D_GPF, 0);
    }
    selector = (env->star >> 48) & 0xffff;
    if (env->hflags & HF_LMA_MASK) {
        if (dflag == 2) {
            cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3,
                                   0, 0xffffffff,
                                   DESC_G_MASK | DESC_P_MASK |
                                   DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                                   DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
                                   DESC_L_MASK);
            env->eip = ECX;
        } else {
            cpu_x86_load_seg_cache(env, R_CS, selector | 3,
                                   0, 0xffffffff,
                                   DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                                   DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                                   DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
            env->eip = (uint32_t)ECX;
        }
        cpu_x86_load_seg_cache(env, R_SS, selector + 8,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_W_MASK | DESC_A_MASK);
        load_eflags((uint32_t)(env->regs[11]), TF_MASK | AC_MASK | ID_MASK |
                    IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK);
        cpu_x86_set_cpl(env, 3);
    } else {
        cpu_x86_load_seg_cache(env, R_CS, selector | 3,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
        env->eip = (uint32_t)ECX;
        cpu_x86_load_seg_cache(env, R_SS, selector + 8,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_W_MASK | DESC_A_MASK);
        env->eflags |= IF_MASK;
        cpu_x86_set_cpl(env, 3);
    }
#ifdef USE_KQEMU
    if (kqemu_is_ok(env)) {
        if (env->hflags & HF_LMA_MASK)
            CC_OP = CC_OP_EFLAGS;
        env->exception_index = -1;
        cpu_loop_exit();
    }
#endif
}
#endif

/* real mode interrupt */
static void do_interrupt_real(int intno, int is_int, int error_code,
                              unsigned int next_eip)
{
    SegmentCache *dt;
    target_ulong ptr, ssp;
    int selector;
    uint32_t offset, esp;
    uint32_t old_cs, old_eip;

    /* real mode (simpler !) */
    dt = &env->idt;
    if (intno * 4 + 3 > dt->limit)
        raise_exception_err(EXCP0D_GPF, intno * 8 + 2);
    ptr = dt->base + intno * 4;
    offset = lduw_kernel(ptr);
    selector = lduw_kernel(ptr + 2);
    esp = ESP;
    ssp = env->segs[R_SS].base;
    if (is_int)
        old_eip = next_eip;
    else
        old_eip = env->eip;
    old_cs = env->segs[R_CS].selector;
    /* XXX: use SS segment size ? */
    PUSHW(ssp, esp, 0xffff, compute_eflags());
    PUSHW(ssp, esp, 0xffff, old_cs);
    PUSHW(ssp, esp, 0xffff, old_eip);

    /* update processor state */
    ESP = (ESP & ~0xffff) | (esp & 0xffff);
    env->eip = offset;
    env->segs[R_CS].selector = selector;
    env->segs[R_CS].base = (selector << 4);
    env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK);
}

/* fake user mode interrupt */
void do_interrupt_user(int intno, int is_int, int error_code,
                       target_ulong next_eip)
{
    SegmentCache *dt;
    target_ulong ptr;
    int dpl, cpl, shift;
    uint32_t e2;

    dt = &env->idt;
    if (env->hflags & HF_LMA_MASK) {
        shift = 4;
    } else {
        shift = 3;
    }
    ptr = dt->base + (intno << shift);
    e2 = ldl_kernel(ptr + 4);

    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    /* check privilege if software int */
    if (is_int && dpl < cpl)
        raise_exception_err(EXCP0D_GPF, (intno << shift) + 2);

    /* Since we emulate only user space, we cannot do more than
       exiting the emulation with the suitable exception and error
       code */
    if (is_int)
        EIP = next_eip;
}

/*
 * Begin execution of an interruption. is_int is TRUE if coming from
 * the int instruction. next_eip is the EIP value AFTER the interrupt
 * instruction. It is only relevant if is_int is TRUE.
 */
void do_interrupt(int intno, int is_int, int error_code,
                  target_ulong next_eip, int is_hw)
{
    if (loglevel & CPU_LOG_INT) {
        if ((env->cr[0] & CR0_PE_MASK)) {
            static int count;
            qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx " pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx,
                    count, intno, error_code, is_int,
                    env->hflags & HF_CPL_MASK,
                    env->segs[R_CS].selector, EIP,
                    (int)env->segs[R_CS].base + EIP,
                    env->segs[R_SS].selector, ESP);
            if (intno == 0x0e) {
                qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]);
            } else {
                qemu_log(" EAX=" TARGET_FMT_lx, EAX);
            }
            qemu_log("\n");
            log_cpu_state(env, X86_DUMP_CCOP);
#if 0
            {
                int i;
                uint8_t *ptr;
                qemu_log("       code=");
                ptr = env->segs[R_CS].base + env->eip;
                for(i = 0; i < 16; i++) {
                    qemu_log(" %02x", ldub(ptr + i));
                }
                qemu_log("\n");
            }
#endif
            count++;
        }
    }
    if (env->cr[0] & CR0_PE_MASK) {
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK) {
            do_interrupt64(intno, is_int, error_code, next_eip, is_hw);
        } else
#endif
        {
            do_interrupt_protected(intno, is_int, error_code, next_eip, is_hw);
        }
    } else {
        do_interrupt_real(intno, is_int, error_code, next_eip);
    }
}

/*
 * Check nested exceptions and change to double or triple fault if
 * needed. It should only be called, if this is not an interrupt.
 * Returns the new exception number.
 */
static int check_exception(int intno, int *error_code)
{
    int first_contributory = env->old_exception == 0 ||
                              (env->old_exception >= 10 &&
                               env->old_exception <= 13);
    int second_contributory = intno == 0 ||
                               (intno >= 10 && intno <= 13);

    qemu_log_mask(CPU_LOG_INT, "check_exception old: 0x%x new 0x%x\n",
                env->old_exception, intno);

    if (env->old_exception == EXCP08_DBLE)
        cpu_abort(env, "triple fault");

    if ((first_contributory && second_contributory)
        || (env->old_exception == EXCP0E_PAGE &&
            (second_contributory || (intno == EXCP0E_PAGE)))) {
        intno = EXCP08_DBLE;
        *error_code = 0;
    }

    if (second_contributory || (intno == EXCP0E_PAGE) ||
        (intno == EXCP08_DBLE))
        env->old_exception = intno;

    return intno;
}

/*
 * Signal an interruption. It is executed in the main CPU loop.
 * is_int is TRUE if coming from the int instruction. next_eip is the
 * EIP value AFTER the interrupt instruction. It is only relevant if
 * is_int is TRUE.
 */
static void noreturn raise_interrupt(int intno, int is_int, int error_code,
                                     int next_eip_addend)
{
    if (!is_int) {
        helper_svm_check_intercept_param(SVM_EXIT_EXCP_BASE + intno, error_code);
        intno = check_exception(intno, &error_code);
    } else {
        helper_svm_check_intercept_param(SVM_EXIT_SWINT, 0);
    }

    env->exception_index = intno;
    env->error_code = error_code;
    env->exception_is_int = is_int;
    env->exception_next_eip = env->eip + next_eip_addend;
    cpu_loop_exit();
}

/* shortcuts to generate exceptions */

void raise_exception_err(int exception_index, int error_code)
{
    raise_interrupt(exception_index, 0, error_code, 0);
}

void raise_exception(int exception_index)
{
    raise_interrupt(exception_index, 0, 0, 0);
}

/* SMM support */

#if defined(CONFIG_USER_ONLY)

void do_smm_enter(void)
{
}

void helper_rsm(void)
{
}

#else

#ifdef TARGET_X86_64
#define SMM_REVISION_ID 0x00020064
#else
#define SMM_REVISION_ID 0x00020000
#endif

void do_smm_enter(void)
{
    target_ulong sm_state;
    SegmentCache *dt;
    int i, offset;

    qemu_log_mask(CPU_LOG_INT, "SMM: enter\n");
    log_cpu_state_mask(CPU_LOG_INT, env, X86_DUMP_CCOP);

    env->hflags |= HF_SMM_MASK;
    cpu_smm_update(env);

    sm_state = env->smbase + 0x8000;

#ifdef TARGET_X86_64
    for(i = 0; i < 6; i++) {
        dt = &env->segs[i];
        offset = 0x7e00 + i * 16;
        stw_phys(sm_state + offset, dt->selector);
        stw_phys(sm_state + offset + 2, (dt->flags >> 8) & 0xf0ff);
        stl_phys(sm_state + offset + 4, dt->limit);
        stq_phys(sm_state + offset + 8, dt->base);
    }

    stq_phys(sm_state + 0x7e68, env->gdt.base);
    stl_phys(sm_state + 0x7e64, env->gdt.limit);

    stw_phys(sm_state + 0x7e70, env->ldt.selector);
    stq_phys(sm_state + 0x7e78, env->ldt.base);
    stl_phys(sm_state + 0x7e74, env->ldt.limit);
    stw_phys(sm_state + 0x7e72, (env->ldt.flags >> 8) & 0xf0ff);

    stq_phys(sm_state + 0x7e88, env->idt.base);
    stl_phys(sm_state + 0x7e84, env->idt.limit);

    stw_phys(sm_state + 0x7e90, env->tr.selector);
    stq_phys(sm_state + 0x7e98, env->tr.base);
    stl_phys(sm_state + 0x7e94, env->tr.limit);
    stw_phys(sm_state + 0x7e92, (env->tr.flags >> 8) & 0xf0ff);

    stq_phys(sm_state + 0x7ed0, env->efer);

    stq_phys(sm_state + 0x7ff8, EAX);
    stq_phys(sm_state + 0x7ff0, ECX);
    stq_phys(sm_state + 0x7fe8, EDX);
    stq_phys(sm_state + 0x7fe0, EBX);
    stq_phys(sm_state + 0x7fd8, ESP);
    stq_phys(sm_state + 0x7fd0, EBP);
    stq_phys(sm_state + 0x7fc8, ESI);
    stq_phys(sm_state + 0x7fc0, EDI);
    for(i = 8; i < 16; i++)
        stq_phys(sm_state + 0x7ff8 - i * 8, env->regs[i]);
    stq_phys(sm_state + 0x7f78, env->eip);
    stl_phys(sm_state + 0x7f70, compute_eflags());
    stl_phys(sm_state + 0x7f68, env->dr[6]);
    stl_phys(sm_state + 0x7f60, env->dr[7]);

    stl_phys(sm_state + 0x7f48, env->cr[4]);
    stl_phys(sm_state + 0x7f50, env->cr[3]);
    stl_phys(sm_state + 0x7f58, env->cr[0]);

    stl_phys(sm_state + 0x7efc, SMM_REVISION_ID);
    stl_phys(sm_state + 0x7f00, env->smbase);
#else
    stl_phys(sm_state + 0x7ffc, env->cr[0]);
    stl_phys(sm_state + 0x7ff8, env->cr[3]);
    stl_phys(sm_state + 0x7ff4, compute_eflags());
    stl_phys(sm_state + 0x7ff0, env->eip);
    stl_phys(sm_state + 0x7fec, EDI);
    stl_phys(sm_state + 0x7fe8, ESI);
    stl_phys(sm_state + 0x7fe4, EBP);
    stl_phys(sm_state + 0x7fe0, ESP);
    stl_phys(sm_state + 0x7fdc, EBX);
    stl_phys(sm_state + 0x7fd8, EDX);
    stl_phys(sm_state + 0x7fd4, ECX);
    stl_phys(sm_state + 0x7fd0, EAX);
    stl_phys(sm_state + 0x7fcc, env->dr[6]);
    stl_phys(sm_state + 0x7fc8, env->dr[7]);

    stl_phys(sm_state + 0x7fc4, env->tr.selector);
    stl_phys(sm_state + 0x7f64, env->tr.base);
    stl_phys(sm_state + 0x7f60, env->tr.limit);
    stl_phys(sm_state + 0x7f5c, (env->tr.flags >> 8) & 0xf0ff);

    stl_phys(sm_state + 0x7fc0, env->ldt.selector);
    stl_phys(sm_state + 0x7f80, env->ldt.base);
    stl_phys(sm_state + 0x7f7c, env->ldt.limit);
    stl_phys(sm_state + 0x7f78, (env->ldt.flags >> 8) & 0xf0ff);

    stl_phys(sm_state + 0x7f74, env->gdt.base);
    stl_phys(sm_state + 0x7f70, env->gdt.limit);

    stl_phys(sm_state + 0x7f58, env->idt.base);
    stl_phys(sm_state + 0x7f54, env->idt.limit);

    for(i = 0; i < 6; i++) {
        dt = &env->segs[i];
        if (i < 3)
            offset = 0x7f84 + i * 12;
        else
            offset = 0x7f2c + (i - 3) * 12;
        stl_phys(sm_state + 0x7fa8 + i * 4, dt->selector);
        stl_phys(sm_state + offset + 8, dt->base);
        stl_phys(sm_state + offset + 4, dt->limit);
        stl_phys(sm_state + offset, (dt->flags >> 8) & 0xf0ff);
    }
    stl_phys(sm_state + 0x7f14, env->cr[4]);

    stl_phys(sm_state + 0x7efc, SMM_REVISION_ID);
    stl_phys(sm_state + 0x7ef8, env->smbase);
#endif
    /* init SMM cpu state */

#ifdef TARGET_X86_64
    cpu_load_efer(env, 0);
#endif
    load_eflags(0, ~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
    env->eip = 0x00008000;
    cpu_x86_load_seg_cache(env, R_CS, (env->smbase >> 4) & 0xffff, env->smbase,
                           0xffffffff, 0);
    cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0xffffffff, 0);
    cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0xffffffff, 0);
    cpu_x86_load_seg_cache(env, R_SS, 0, 0, 0xffffffff, 0);
    cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0xffffffff, 0);
    cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0xffffffff, 0);

    cpu_x86_update_cr0(env,
                       env->cr[0] & ~(CR0_PE_MASK | CR0_EM_MASK | CR0_TS_MASK | CR0_PG_MASK));
    cpu_x86_update_cr4(env, 0);
    env->dr[7] = 0x00000400;
    CC_OP = CC_OP_EFLAGS;
}

void helper_rsm(void)
{
    target_ulong sm_state;
    int i, offset;
    uint32_t val;

    sm_state = env->smbase + 0x8000;
#ifdef TARGET_X86_64
    cpu_load_efer(env, ldq_phys(sm_state + 0x7ed0));

    for(i = 0; i < 6; i++) {
        offset = 0x7e00 + i * 16;
        cpu_x86_load_seg_cache(env, i,
                               lduw_phys(sm_state + offset),
                               ldq_phys(sm_state + offset + 8),
                               ldl_phys(sm_state + offset + 4),
                               (lduw_phys(sm_state + offset + 2) & 0xf0ff) << 8);
    }

    env->gdt.base = ldq_phys(sm_state + 0x7e68);
    env->gdt.limit = ldl_phys(sm_state + 0x7e64);

    env->ldt.selector = lduw_phys(sm_state + 0x7e70);
    env->ldt.base = ldq_phys(sm_state + 0x7e78);
    env->ldt.limit = ldl_phys(sm_state + 0x7e74);
    env->ldt.flags = (lduw_phys(sm_state + 0x7e72) & 0xf0ff) << 8;

    env->idt.base = ldq_phys(sm_state + 0x7e88);
    env->idt.limit = ldl_phys(sm_state + 0x7e84);

    env->tr.selector = lduw_phys(sm_state + 0x7e90);
    env->tr.base = ldq_phys(sm_state + 0x7e98);
    env->tr.limit = ldl_phys(sm_state + 0x7e94);
    env->tr.flags = (lduw_phys(sm_state + 0x7e92) & 0xf0ff) << 8;

    EAX = ldq_phys(sm_state + 0x7ff8);
    ECX = ldq_phys(sm_state + 0x7ff0);
    EDX = ldq_phys(sm_state + 0x7fe8);
    EBX = ldq_phys(sm_state + 0x7fe0);
    ESP = ldq_phys(sm_state + 0x7fd8);
    EBP = ldq_phys(sm_state + 0x7fd0);
    ESI = ldq_phys(sm_state + 0x7fc8);
    EDI = ldq_phys(sm_state + 0x7fc0);
    for(i = 8; i < 16; i++)
        env->regs[i] = ldq_phys(sm_state + 0x7ff8 - i * 8);
    env->eip = ldq_phys(sm_state + 0x7f78);
    load_eflags(ldl_phys(sm_state + 0x7f70),
                ~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
    env->dr[6] = ldl_phys(sm_state + 0x7f68);
    env->dr[7] = ldl_phys(sm_state + 0x7f60);

    cpu_x86_update_cr4(env, ldl_phys(sm_state + 0x7f48));
    cpu_x86_update_cr3(env, ldl_phys(sm_state + 0x7f50));
    cpu_x86_update_cr0(env, ldl_phys(sm_state + 0x7f58));

    val = ldl_phys(sm_state + 0x7efc); /* revision ID */
    if (val & 0x20000) {
        env->smbase = ldl_phys(sm_state + 0x7f00) & ~0x7fff;
    }
#else
    cpu_x86_update_cr0(env, ldl_phys(sm_state + 0x7ffc));
    cpu_x86_update_cr3(env, ldl_phys(sm_state + 0x7ff8));
    load_eflags(ldl_phys(sm_state + 0x7ff4),
                ~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
    env->eip = ldl_phys(sm_state + 0x7ff0);
    EDI = ldl_phys(sm_state + 0x7fec);
    ESI = ldl_phys(sm_state + 0x7fe8);
    EBP = ldl_phys(sm_state + 0x7fe4);
    ESP = ldl_phys(sm_state + 0x7fe0);
    EBX = ldl_phys(sm_state + 0x7fdc);
    EDX = ldl_phys(sm_state + 0x7fd8);
    ECX = ldl_phys(sm_state + 0x7fd4);
    EAX = ldl_phys(sm_state + 0x7fd0);
    env->dr[6] = ldl_phys(sm_state + 0x7fcc);
    env->dr[7] = ldl_phys(sm_state + 0x7fc8);

    env->tr.selector = ldl_phys(sm_state + 0x7fc4) & 0xffff;
    env->tr.base = ldl_phys(sm_state + 0x7f64);
    env->tr.limit = ldl_phys(sm_state + 0x7f60);
    env->tr.flags = (ldl_phys(sm_state + 0x7f5c) & 0xf0ff) << 8;

    env->ldt.selector = ldl_phys(sm_state + 0x7fc0) & 0xffff;
    env->ldt.base = ldl_phys(sm_state + 0x7f80);
    env->ldt.limit = ldl_phys(sm_state + 0x7f7c);
    env->ldt.flags = (ldl_phys(sm_state + 0x7f78) & 0xf0ff) << 8;

    env->gdt.base = ldl_phys(sm_state + 0x7f74);
    env->gdt.limit = ldl_phys(sm_state + 0x7f70);

    env->idt.base = ldl_phys(sm_state + 0x7f58);
    env->idt.limit = ldl_phys(sm_state + 0x7f54);

    for(i = 0; i < 6; i++) {
        if (i < 3)
            offset = 0x7f84 + i * 12;
        else
            offset = 0x7f2c + (i - 3) * 12;
        cpu_x86_load_seg_cache(env, i,
                               ldl_phys(sm_state + 0x7fa8 + i * 4) & 0xffff,
                               ldl_phys(sm_state + offset + 8),
                               ldl_phys(sm_state + offset + 4),
                               (ldl_phys(sm_state + offset) & 0xf0ff) << 8);
    }
    cpu_x86_update_cr4(env, ldl_phys(sm_state + 0x7f14));

    val = ldl_phys(sm_state + 0x7efc); /* revision ID */
    if (val & 0x20000) {
        env->smbase = ldl_phys(sm_state + 0x7ef8) & ~0x7fff;
    }
#endif
    CC_OP = CC_OP_EFLAGS;
    env->hflags &= ~HF_SMM_MASK;
    cpu_smm_update(env);

    qemu_log_mask(CPU_LOG_INT, "SMM: after RSM\n");
    log_cpu_state_mask(CPU_LOG_INT, env, X86_DUMP_CCOP);
}

#endif /* !CONFIG_USER_ONLY */


/* division, flags are undefined */

void helper_divb_AL(target_ulong t0)
{
    unsigned int num, den, q, r;

    num = (EAX & 0xffff);
    den = (t0 & 0xff);
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    if (q > 0xff)
        raise_exception(EXCP00_DIVZ);
    q &= 0xff;
    r = (num % den) & 0xff;
    EAX = (EAX & ~0xffff) | (r << 8) | q;
}

void helper_idivb_AL(target_ulong t0)
{
    int num, den, q, r;

    num = (int16_t)EAX;
    den = (int8_t)t0;
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    if (q != (int8_t)q)
        raise_exception(EXCP00_DIVZ);
    q &= 0xff;
    r = (num % den) & 0xff;
    EAX = (EAX & ~0xffff) | (r << 8) | q;
}

void helper_divw_AX(target_ulong t0)
{
    unsigned int num, den, q, r;

    num = (EAX & 0xffff) | ((EDX & 0xffff) << 16);
    den = (t0 & 0xffff);
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    if (q > 0xffff)
        raise_exception(EXCP00_DIVZ);
    q &= 0xffff;
    r = (num % den) & 0xffff;
    EAX = (EAX & ~0xffff) | q;
    EDX = (EDX & ~0xffff) | r;
}

void helper_idivw_AX(target_ulong t0)
{
    int num, den, q, r;

    num = (EAX & 0xffff) | ((EDX & 0xffff) << 16);
    den = (int16_t)t0;
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    if (q != (int16_t)q)
        raise_exception(EXCP00_DIVZ);
    q &= 0xffff;
    r = (num % den) & 0xffff;
    EAX = (EAX & ~0xffff) | q;
    EDX = (EDX & ~0xffff) | r;
}

void helper_divl_EAX(target_ulong t0)
{
    unsigned int den, r;
    uint64_t num, q;

    num = ((uint32_t)EAX) | ((uint64_t)((uint32_t)EDX) << 32);
    den = t0;
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    r = (num % den);
    if (q > 0xffffffff)
        raise_exception(EXCP00_DIVZ);
    EAX = (uint32_t)q;
    EDX = (uint32_t)r;
}

void helper_idivl_EAX(target_ulong t0)
{
    int den, r;
    int64_t num, q;

    num = ((uint32_t)EAX) | ((uint64_t)((uint32_t)EDX) << 32);
    den = t0;
    if (den == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    q = (num / den);
    r = (num % den);
    if (q != (int32_t)q)
        raise_exception(EXCP00_DIVZ);
    EAX = (uint32_t)q;
    EDX = (uint32_t)r;
}

/* bcd */

/* XXX: exception */
void helper_aam(int base)
{
    int al, ah;
    al = EAX & 0xff;
    ah = al / base;
    al = al % base;
    EAX = (EAX & ~0xffff) | al | (ah << 8);
    CC_DST = al;
}

void helper_aad(int base)
{
    int al, ah;
    al = EAX & 0xff;
    ah = (EAX >> 8) & 0xff;
    al = ((ah * base) + al) & 0xff;
    EAX = (EAX & ~0xffff) | al;
    CC_DST = al;
}

void helper_aaa(void)
{
    int icarry;
    int al, ah, af;
    int eflags;

    eflags = helper_cc_compute_all(CC_OP);
    af = eflags & CC_A;
    al = EAX & 0xff;
    ah = (EAX >> 8) & 0xff;

    icarry = (al > 0xf9);
    if (((al & 0x0f) > 9 ) || af) {
        al = (al + 6) & 0x0f;
        ah = (ah + 1 + icarry) & 0xff;
        eflags |= CC_C | CC_A;
    } else {
        eflags &= ~(CC_C | CC_A);
        al &= 0x0f;
    }
    EAX = (EAX & ~0xffff) | al | (ah << 8);
    CC_SRC = eflags;
}

void helper_aas(void)
{
    int icarry;
    int al, ah, af;
    int eflags;

    eflags = helper_cc_compute_all(CC_OP);
    af = eflags & CC_A;
    al = EAX & 0xff;
    ah = (EAX >> 8) & 0xff;

    icarry = (al < 6);
    if (((al & 0x0f) > 9 ) || af) {
        al = (al - 6) & 0x0f;
        ah = (ah - 1 - icarry) & 0xff;
        eflags |= CC_C | CC_A;
    } else {
        eflags &= ~(CC_C | CC_A);
        al &= 0x0f;
    }
    EAX = (EAX & ~0xffff) | al | (ah << 8);
    CC_SRC = eflags;
}

void helper_daa(void)
{
    int al, af, cf;
    int eflags;

    eflags = helper_cc_compute_all(CC_OP);
    cf = eflags & CC_C;
    af = eflags & CC_A;
    al = EAX & 0xff;

    eflags = 0;
    if (((al & 0x0f) > 9 ) || af) {
        al = (al + 6) & 0xff;
        eflags |= CC_A;
    }
    if ((al > 0x9f) || cf) {
        al = (al + 0x60) & 0xff;
        eflags |= CC_C;
    }
    EAX = (EAX & ~0xff) | al;
    /* well, speed is not an issue here, so we compute the flags by hand */
    eflags |= (al == 0) << 6; /* zf */
    eflags |= parity_table[al]; /* pf */
    eflags |= (al & 0x80); /* sf */
    CC_SRC = eflags;
}

void helper_das(void)
{
    int al, al1, af, cf;
    int eflags;

    eflags = helper_cc_compute_all(CC_OP);
    cf = eflags & CC_C;
    af = eflags & CC_A;
    al = EAX & 0xff;

    eflags = 0;
    al1 = al;
    if (((al & 0x0f) > 9 ) || af) {
        eflags |= CC_A;
        if (al < 6 || cf)
            eflags |= CC_C;
        al = (al - 6) & 0xff;
    }
    if ((al1 > 0x99) || cf) {
        al = (al - 0x60) & 0xff;
        eflags |= CC_C;
    }
    EAX = (EAX & ~0xff) | al;
    /* well, speed is not an issue here, so we compute the flags by hand */
    eflags |= (al == 0) << 6; /* zf */
    eflags |= parity_table[al]; /* pf */
    eflags |= (al & 0x80); /* sf */
    CC_SRC = eflags;
}

void helper_into(int next_eip_addend)
{
    int eflags;
    eflags = helper_cc_compute_all(CC_OP);
    if (eflags & CC_O) {
        raise_interrupt(EXCP04_INTO, 1, 0, next_eip_addend);
    }
}

void helper_cmpxchg8b(target_ulong a0)
{
    uint64_t d;
    int eflags;

    eflags = helper_cc_compute_all(CC_OP);
    d = ldq(a0);
    if (d == (((uint64_t)EDX << 32) | (uint32_t)EAX)) {
        stq(a0, ((uint64_t)ECX << 32) | (uint32_t)EBX);
        eflags |= CC_Z;
    } else {
        /* always do the store */
        stq(a0, d); 
        EDX = (uint32_t)(d >> 32);
        EAX = (uint32_t)d;
        eflags &= ~CC_Z;
    }
    CC_SRC = eflags;
}

#ifdef TARGET_X86_64
void helper_cmpxchg16b(target_ulong a0)
{
    uint64_t d0, d1;
    int eflags;

    if ((a0 & 0xf) != 0)
        raise_exception(EXCP0D_GPF);
    eflags = helper_cc_compute_all(CC_OP);
    d0 = ldq(a0);
    d1 = ldq(a0 + 8);
    if (d0 == EAX && d1 == EDX) {
        stq(a0, EBX);
        stq(a0 + 8, ECX);
        eflags |= CC_Z;
    } else {
        /* always do the store */
        stq(a0, d0); 
        stq(a0 + 8, d1); 
        EDX = d1;
        EAX = d0;
        eflags &= ~CC_Z;
    }
    CC_SRC = eflags;
}
#endif

void helper_single_step(void)
{
#ifndef CONFIG_USER_ONLY
    check_hw_breakpoints(env, 1);
    env->dr[6] |= DR6_BS;
#endif
    raise_exception(EXCP01_DB);
}

void helper_cpuid(void)
{
    uint32_t eax, ebx, ecx, edx;

    helper_svm_check_intercept_param(SVM_EXIT_CPUID, 0);

    cpu_x86_cpuid(env, (uint32_t)EAX, &eax, &ebx, &ecx, &edx);
    EAX = eax;
    EBX = ebx;
    ECX = ecx;
    EDX = edx;
}

void helper_enter_level(int level, int data32, target_ulong t1)
{
    target_ulong ssp;
    uint32_t esp_mask, esp, ebp;

    esp_mask = get_sp_mask(env->segs[R_SS].flags);
    ssp = env->segs[R_SS].base;
    ebp = EBP;
    esp = ESP;
    if (data32) {
        /* 32 bit */
        esp -= 4;
        while (--level) {
            esp -= 4;
            ebp -= 4;
            stl(ssp + (esp & esp_mask), ldl(ssp + (ebp & esp_mask)));
        }
        esp -= 4;
        stl(ssp + (esp & esp_mask), t1);
    } else {
        /* 16 bit */
        esp -= 2;
        while (--level) {
            esp -= 2;
            ebp -= 2;
            stw(ssp + (esp & esp_mask), lduw(ssp + (ebp & esp_mask)));
        }
        esp -= 2;
        stw(ssp + (esp & esp_mask), t1);
    }
}

#ifdef TARGET_X86_64
void helper_enter64_level(int level, int data64, target_ulong t1)
{
    target_ulong esp, ebp;
    ebp = EBP;
    esp = ESP;

    if (data64) {
        /* 64 bit */
        esp -= 8;
        while (--level) {
            esp -= 8;
            ebp -= 8;
            stq(esp, ldq(ebp));
        }
        esp -= 8;
        stq(esp, t1);
    } else {
        /* 16 bit */
        esp -= 2;
        while (--level) {
            esp -= 2;
            ebp -= 2;
            stw(esp, lduw(ebp));
        }
        esp -= 2;
        stw(esp, t1);
    }
}
#endif

void helper_lldt(int selector)
{
    SegmentCache *dt;
    uint32_t e1, e2;
    int index, entry_limit;
    target_ulong ptr;

    selector &= 0xffff;
    if ((selector & 0xfffc) == 0) {
        /* XXX: NULL selector case: invalid LDT */
        env->ldt.base = 0;
        env->ldt.limit = 0;
    } else {
        if (selector & 0x4)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        dt = &env->gdt;
        index = selector & ~7;
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK)
            entry_limit = 15;
        else
#endif
            entry_limit = 7;
        if ((index + entry_limit) > dt->limit)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        ptr = dt->base + index;
        e1 = ldl_kernel(ptr);
        e2 = ldl_kernel(ptr + 4);
        if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK) {
            uint32_t e3;
            e3 = ldl_kernel(ptr + 8);
            load_seg_cache_raw_dt(&env->ldt, e1, e2);
            env->ldt.base |= (target_ulong)e3 << 32;
        } else
#endif
        {
            load_seg_cache_raw_dt(&env->ldt, e1, e2);
        }
    }
    env->ldt.selector = selector;
}

void helper_ltr(int selector)
{
    SegmentCache *dt;
    uint32_t e1, e2;
    int index, type, entry_limit;
    target_ulong ptr;

    selector &= 0xffff;
    if ((selector & 0xfffc) == 0) {
        /* NULL selector case: invalid TR */
        env->tr.base = 0;
        env->tr.limit = 0;
        env->tr.flags = 0;
    } else {
        if (selector & 0x4)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        dt = &env->gdt;
        index = selector & ~7;
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK)
            entry_limit = 15;
        else
#endif
            entry_limit = 7;
        if ((index + entry_limit) > dt->limit)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        ptr = dt->base + index;
        e1 = ldl_kernel(ptr);
        e2 = ldl_kernel(ptr + 4);
        type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
        if ((e2 & DESC_S_MASK) ||
            (type != 1 && type != 9))
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK) {
            uint32_t e3, e4;
            e3 = ldl_kernel(ptr + 8);
            e4 = ldl_kernel(ptr + 12);
            if ((e4 >> DESC_TYPE_SHIFT) & 0xf)
                raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
            load_seg_cache_raw_dt(&env->tr, e1, e2);
            env->tr.base |= (target_ulong)e3 << 32;
        } else
#endif
        {
            load_seg_cache_raw_dt(&env->tr, e1, e2);
        }
        e2 |= DESC_TSS_BUSY_MASK;
        stl_kernel(ptr + 4, e2);
    }
    env->tr.selector = selector;
}

/* only works if protected mode and not VM86. seg_reg must be != R_CS */
void helper_load_seg(int seg_reg, int selector)
{
    uint32_t e1, e2;
    int cpl, dpl, rpl;
    SegmentCache *dt;
    int index;
    target_ulong ptr;

    selector &= 0xffff;
    cpl = env->hflags & HF_CPL_MASK;
    if ((selector & 0xfffc) == 0) {
        /* null selector case */
        if (seg_reg == R_SS
#ifdef TARGET_X86_64
            && (!(env->hflags & HF_CS64_MASK) || cpl == 3)
#endif
            )
            raise_exception_err(EXCP0D_GPF, 0);
        cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0);
    } else {

        if (selector & 0x4)
            dt = &env->ldt;
        else
            dt = &env->gdt;
        index = selector & ~7;
        if ((index + 7) > dt->limit)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        ptr = dt->base + index;
        e1 = ldl_kernel(ptr);
        e2 = ldl_kernel(ptr + 4);

        if (!(e2 & DESC_S_MASK))
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        rpl = selector & 3;
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        if (seg_reg == R_SS) {
            /* must be writable segment */
            if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK))
                raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
            if (rpl != cpl || dpl != cpl)
                raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        } else {
            /* must be readable segment */
            if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK)
                raise_exception_err(EXCP0D_GPF, selector & 0xfffc);

            if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
                /* if not conforming code, test rights */
                if (dpl < cpl || dpl < rpl)
                    raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
            }
        }

        if (!(e2 & DESC_P_MASK)) {
            if (seg_reg == R_SS)
                raise_exception_err(EXCP0C_STACK, selector & 0xfffc);
            else
                raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);
        }

        /* set the access bit if not already set */
        if (!(e2 & DESC_A_MASK)) {
            e2 |= DESC_A_MASK;
            stl_kernel(ptr + 4, e2);
        }

        cpu_x86_load_seg_cache(env, seg_reg, selector,
                       get_seg_base(e1, e2),
                       get_seg_limit(e1, e2),
                       e2);
#if 0
        qemu_log("load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n",
                selector, (unsigned long)sc->base, sc->limit, sc->flags);
#endif
    }
}

/* protected mode jump */
void helper_ljmp_protected(int new_cs, target_ulong new_eip,
                           int next_eip_addend)
{
    int gate_cs, type;
    uint32_t e1, e2, cpl, dpl, rpl, limit;
    target_ulong next_eip;

    if ((new_cs & 0xfffc) == 0)
        raise_exception_err(EXCP0D_GPF, 0);
    if (load_segment(&e1, &e2, new_cs) != 0)
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    cpl = env->hflags & HF_CPL_MASK;
    if (e2 & DESC_S_MASK) {
        if (!(e2 & DESC_CS_MASK))
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        if (e2 & DESC_C_MASK) {
            /* conforming code segment */
            if (dpl > cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        } else {
            /* non conforming code segment */
            rpl = new_cs & 3;
            if (rpl > cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            if (dpl != cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        }
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc);
        limit = get_seg_limit(e1, e2);
        if (new_eip > limit &&
            !(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK))
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
                       get_seg_base(e1, e2), limit, e2);
        EIP = new_eip;
    } else {
        /* jump to call or task gate */
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        rpl = new_cs & 3;
        cpl = env->hflags & HF_CPL_MASK;
        type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
        switch(type) {
        case 1: /* 286 TSS */
        case 9: /* 386 TSS */
        case 5: /* task gate */
            if (dpl < cpl || dpl < rpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            next_eip = env->eip + next_eip_addend;
            switch_tss(new_cs, e1, e2, SWITCH_TSS_JMP, next_eip);
            CC_OP = CC_OP_EFLAGS;
            break;
        case 4: /* 286 call gate */
        case 12: /* 386 call gate */
            if ((dpl < cpl) || (dpl < rpl))
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            if (!(e2 & DESC_P_MASK))
                raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc);
            gate_cs = e1 >> 16;
            new_eip = (e1 & 0xffff);
            if (type == 12)
                new_eip |= (e2 & 0xffff0000);
            if (load_segment(&e1, &e2, gate_cs) != 0)
                raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
            dpl = (e2 >> DESC_DPL_SHIFT) & 3;
            /* must be code segment */
            if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) !=
                 (DESC_S_MASK | DESC_CS_MASK)))
                raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
            if (((e2 & DESC_C_MASK) && (dpl > cpl)) ||
                (!(e2 & DESC_C_MASK) && (dpl != cpl)))
                raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
            if (!(e2 & DESC_P_MASK))
                raise_exception_err(EXCP0D_GPF, gate_cs & 0xfffc);
            limit = get_seg_limit(e1, e2);
            if (new_eip > limit)
                raise_exception_err(EXCP0D_GPF, 0);
            cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl,
                                   get_seg_base(e1, e2), limit, e2);
            EIP = new_eip;
            break;
        default:
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            break;
        }
    }
}

/* real mode call */
void helper_lcall_real(int new_cs, target_ulong new_eip1,
                       int shift, int next_eip)
{
    int new_eip;
    uint32_t esp, esp_mask;
    target_ulong ssp;

    new_eip = new_eip1;
    esp = ESP;
    esp_mask = get_sp_mask(env->segs[R_SS].flags);
    ssp = env->segs[R_SS].base;
    if (shift) {
        PUSHL(ssp, esp, esp_mask, env->segs[R_CS].selector);
        PUSHL(ssp, esp, esp_mask, next_eip);
    } else {
        PUSHW(ssp, esp, esp_mask, env->segs[R_CS].selector);
        PUSHW(ssp, esp, esp_mask, next_eip);
    }

    SET_ESP(esp, esp_mask);
    env->eip = new_eip;
    env->segs[R_CS].selector = new_cs;
    env->segs[R_CS].base = (new_cs << 4);
}

/* protected mode call */
void helper_lcall_protected(int new_cs, target_ulong new_eip, 
                            int shift, int next_eip_addend)
{
    int new_stack, i;
    uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count;
    uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, sp, type, ss_dpl, sp_mask;
    uint32_t val, limit, old_sp_mask;
    target_ulong ssp, old_ssp, next_eip;

    next_eip = env->eip + next_eip_addend;
    LOG_PCALL("lcall %04x:%08x s=%d\n", new_cs, (uint32_t)new_eip, shift);
    LOG_PCALL_STATE(env);
    if ((new_cs & 0xfffc) == 0)
        raise_exception_err(EXCP0D_GPF, 0);
    if (load_segment(&e1, &e2, new_cs) != 0)
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    cpl = env->hflags & HF_CPL_MASK;
    LOG_PCALL("desc=%08x:%08x\n", e1, e2);
    if (e2 & DESC_S_MASK) {
        if (!(e2 & DESC_CS_MASK))
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        if (e2 & DESC_C_MASK) {
            /* conforming code segment */
            if (dpl > cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        } else {
            /* non conforming code segment */
            rpl = new_cs & 3;
            if (rpl > cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            if (dpl != cpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        }
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc);

#ifdef TARGET_X86_64
        /* XXX: check 16/32 bit cases in long mode */
        if (shift == 2) {
            target_ulong rsp;
            /* 64 bit case */
            rsp = ESP;
            PUSHQ(rsp, env->segs[R_CS].selector);
            PUSHQ(rsp, next_eip);
            /* from this point, not restartable */
            ESP = rsp;
            cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
                                   get_seg_base(e1, e2),
                                   get_seg_limit(e1, e2), e2);
            EIP = new_eip;
        } else
#endif
        {
            sp = ESP;
            sp_mask = get_sp_mask(env->segs[R_SS].flags);
            ssp = env->segs[R_SS].base;
            if (shift) {
                PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
                PUSHL(ssp, sp, sp_mask, next_eip);
            } else {
                PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
                PUSHW(ssp, sp, sp_mask, next_eip);
            }

            limit = get_seg_limit(e1, e2);
            if (new_eip > limit)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            /* from this point, not restartable */
            SET_ESP(sp, sp_mask);
            cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
                                   get_seg_base(e1, e2), limit, e2);
            EIP = new_eip;
        }
    } else {
        /* check gate type */
        type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        rpl = new_cs & 3;
        switch(type) {
        case 1: /* available 286 TSS */
        case 9: /* available 386 TSS */
        case 5: /* task gate */
            if (dpl < cpl || dpl < rpl)
                raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            switch_tss(new_cs, e1, e2, SWITCH_TSS_CALL, next_eip);
            CC_OP = CC_OP_EFLAGS;
            return;
        case 4: /* 286 call gate */
        case 12: /* 386 call gate */
            break;
        default:
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
            break;
        }
        shift = type >> 3;

        if (dpl < cpl || dpl < rpl)
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
        /* check valid bit */
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG,  new_cs & 0xfffc);
        selector = e1 >> 16;
        offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
        param_count = e2 & 0x1f;
        if ((selector & 0xfffc) == 0)
            raise_exception_err(EXCP0D_GPF, 0);

        if (load_segment(&e1, &e2, selector) != 0)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK)))
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        dpl = (e2 >> DESC_DPL_SHIFT) & 3;
        if (dpl > cpl)
            raise_exception_err(EXCP0D_GPF, selector & 0xfffc);
        if (!(e2 & DESC_P_MASK))
            raise_exception_err(EXCP0B_NOSEG, selector & 0xfffc);

        if (!(e2 & DESC_C_MASK) && dpl < cpl) {
            /* to inner privilege */
            get_ss_esp_from_tss(&ss, &sp, dpl);
            LOG_PCALL("new ss:esp=%04x:%08x param_count=%d ESP=" TARGET_FMT_lx "\n",
                        ss, sp, param_count, ESP);
            if ((ss & 0xfffc) == 0)
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
            if ((ss & 3) != dpl)
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
            if (load_segment(&ss_e1, &ss_e2, ss) != 0)
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
            ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
            if (ss_dpl != dpl)
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
            if (!(ss_e2 & DESC_S_MASK) ||
                (ss_e2 & DESC_CS_MASK) ||
                !(ss_e2 & DESC_W_MASK))
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);
            if (!(ss_e2 & DESC_P_MASK))
                raise_exception_err(EXCP0A_TSS, ss & 0xfffc);

            //            push_size = ((param_count * 2) + 8) << shift;

            old_sp_mask = get_sp_mask(env->segs[R_SS].flags);
            old_ssp = env->segs[R_SS].base;

            sp_mask = get_sp_mask(ss_e2);
            ssp = get_seg_base(ss_e1, ss_e2);
            if (shift) {
                PUSHL(ssp, sp, sp_mask, env->segs[R_SS].selector);
                PUSHL(ssp, sp, sp_mask, ESP);
                for(i = param_count - 1; i >= 0; i--) {
                    val = ldl_kernel(old_ssp + ((ESP + i * 4) & old_sp_mask));
                    PUSHL(ssp, sp, sp_mask, val);
                }
            } else {
                PUSHW(ssp, sp, sp_mask, env->segs[R_SS].selector);
                PUSHW(ssp, sp, sp_mask, ESP);
                for(i = param_count - 1; i >= 0; i--) {
                    val = lduw_kernel(old_ssp + ((ESP + i * 2) & old_sp_mask));
                    PUSHW(ssp, sp, sp_mask, val);
                }
            }
            new_stack = 1;
        } else {
            /* to same privilege */
            sp = ESP;
            sp_mask = get_sp_mask(env->segs[R_SS].flags);
            ssp = env->segs[R_SS].base;
            //            push_size = (4 << shift);
            new_stack = 0;
        }

        if (shift) {
            PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
            PUSHL(ssp, sp, sp_mask, next_eip);
        } else {
            PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
            PUSHW(ssp, sp, sp_mask, next_eip);
        }

        /* from this point, not restartable */

        if (new_stack) {
            ss = (ss & ~3) | dpl;
            cpu_x86_load_seg_cache(env, R_SS, ss,
                                   ssp,
                                   get_seg_limit(ss_e1, ss_e2),
                                   ss_e2);
        }

        selector = (selector & ~3) | dpl;
        cpu_x86_load_seg_cache(env, R_CS, selector,
                       get_seg_base(e1, e2),
                       get_seg_limit(e1, e2),
                       e2);
        cpu_x86_set_cpl(env, dpl);
        SET_ESP(sp, sp_mask);
        EIP = offset;
    }
#ifdef USE_KQEMU
    if (kqemu_is_ok(env)) {
        env->exception_index = -1;
        cpu_loop_exit();
    }
#endif
}

/* real and vm86 mode iret */
void helper_iret_real(int shift)
{
    uint32_t sp, new_cs, new_eip, new_eflags, sp_mask;
    target_ulong ssp;
    int eflags_mask;

    sp_mask = 0xffff; /* XXXX: use SS segment size ? */
    sp = ESP;
    ssp = env->segs[R_SS].base;
    if (shift == 1) {
        /* 32 bits */
        POPL(ssp, sp, sp_mask, new_eip);
        POPL(ssp, sp, sp_mask, new_cs);
        new_cs &= 0xffff;
        POPL(ssp, sp, sp_mask, new_eflags);
    } else {
        /* 16 bits */
        POPW(ssp, sp, sp_mask, new_eip);
        POPW(ssp, sp, sp_mask, new_cs);
        POPW(ssp, sp, sp_mask, new_eflags);
    }
    ESP = (ESP & ~sp_mask) | (sp & sp_mask);
    env->segs[R_CS].selector = new_cs;
    env->segs[R_CS].base = (new_cs << 4);
    env->eip = new_eip;
    if (env->eflags & VM_MASK)
        eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | NT_MASK;
    else
        eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | RF_MASK | NT_MASK;
    if (shift == 0)
        eflags_mask &= 0xffff;
    load_eflags(new_eflags, eflags_mask);
    env->hflags2 &= ~HF2_NMI_MASK;
}

static inline void validate_seg(int seg_reg, int cpl)
{
    int dpl;
    uint32_t e2;

    /* XXX: on x86_64, we do not want to nullify FS and GS because
       they may still contain a valid base. I would be interested to
       know how a real x86_64 CPU behaves */
    if ((seg_reg == R_FS || seg_reg == R_GS) &&
        (env->segs[seg_reg].selector & 0xfffc) == 0)
        return;

    e2 = env->segs[seg_reg].flags;
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
        /* data or non conforming code segment */
        if (dpl < cpl) {
            cpu_x86_load_seg_cache(env, seg_reg, 0, 0, 0, 0);
        }
    }
}

/* protected mode iret */
static inline void helper_ret_protected(int shift, int is_iret, int addend)
{
    uint32_t new_cs, new_eflags, new_ss;
    uint32_t new_es, new_ds, new_fs, new_gs;
    uint32_t e1, e2, ss_e1, ss_e2;
    int cpl, dpl, rpl, eflags_mask, iopl;
    target_ulong ssp, sp, new_eip, new_esp, sp_mask;

#ifdef TARGET_X86_64
    if (shift == 2)
        sp_mask = -1;
    else
#endif
        sp_mask = get_sp_mask(env->segs[R_SS].flags);
    sp = ESP;
    ssp = env->segs[R_SS].base;
    new_eflags = 0; /* avoid warning */
#ifdef TARGET_X86_64
    if (shift == 2) {
        POPQ(sp, new_eip);
        POPQ(sp, new_cs);
        new_cs &= 0xffff;
        if (is_iret) {
            POPQ(sp, new_eflags);
        }
    } else
#endif
    if (shift == 1) {
        /* 32 bits */
        POPL(ssp, sp, sp_mask, new_eip);
        POPL(ssp, sp, sp_mask, new_cs);
        new_cs &= 0xffff;
        if (is_iret) {
            POPL(ssp, sp, sp_mask, new_eflags);
            if (new_eflags & VM_MASK)
                goto return_to_vm86;
        }
    } else {
        /* 16 bits */
        POPW(ssp, sp, sp_mask, new_eip);
        POPW(ssp, sp, sp_mask, new_cs);
        if (is_iret)
            POPW(ssp, sp, sp_mask, new_eflags);
    }
    LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n",
              new_cs, new_eip, shift, addend);
    LOG_PCALL_STATE(env);
    if ((new_cs & 0xfffc) == 0)
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    if (load_segment(&e1, &e2, new_cs) != 0)
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    if (!(e2 & DESC_S_MASK) ||
        !(e2 & DESC_CS_MASK))
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    cpl = env->hflags & HF_CPL_MASK;
    rpl = new_cs & 3;
    if (rpl < cpl)
        raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    if (e2 & DESC_C_MASK) {
        if (dpl > rpl)
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    } else {
        if (dpl != rpl)
            raise_exception_err(EXCP0D_GPF, new_cs & 0xfffc);
    }
    if (!(e2 & DESC_P_MASK))
        raise_exception_err(EXCP0B_NOSEG, new_cs & 0xfffc);

    sp += addend;
    if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) ||
                       ((env->hflags & HF_CS64_MASK) && !is_iret))) {
        /* return to same privilege level */
        cpu_x86_load_seg_cache(env, R_CS, new_cs,
                       get_seg_base(e1, e2),
                       get_seg_limit(e1, e2),
                       e2);
    } else {
        /* return to different privilege level */
#ifdef TARGET_X86_64
        if (shift == 2) {
            POPQ(sp, new_esp);
            POPQ(sp, new_ss);
            new_ss &= 0xffff;
        } else
#endif
        if (shift == 1) {
            /* 32 bits */
            POPL(ssp, sp, sp_mask, new_esp);
            POPL(ssp, sp, sp_mask, new_ss);
            new_ss &= 0xffff;
        } else {
            /* 16 bits */
            POPW(ssp, sp, sp_mask, new_esp);
            POPW(ssp, sp, sp_mask, new_ss);
        }
        LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n",
                    new_ss, new_esp);
        if ((new_ss & 0xfffc) == 0) {
#ifdef TARGET_X86_64
            /* NULL ss is allowed in long mode if cpl != 3*/
            /* XXX: test CS64 ? */
            if ((env->hflags & HF_LMA_MASK) && rpl != 3) {
                cpu_x86_load_seg_cache(env, R_SS, new_ss,
                                       0, 0xffffffff,
                                       DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                                       DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
                                       DESC_W_MASK | DESC_A_MASK);
                ss_e2 = DESC_B_MASK; /* XXX: should not be needed ? */
            } else
#endif
            {
                raise_exception_err(EXCP0D_GPF, 0);
            }
        } else {
            if ((new_ss & 3) != rpl)
                raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc);
            if (load_segment(&ss_e1, &ss_e2, new_ss) != 0)
                raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc);
            if (!(ss_e2 & DESC_S_MASK) ||
                (ss_e2 & DESC_CS_MASK) ||
                !(ss_e2 & DESC_W_MASK))
                raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc);
            dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
            if (dpl != rpl)
                raise_exception_err(EXCP0D_GPF, new_ss & 0xfffc);
            if (!(ss_e2 & DESC_P_MASK))
                raise_exception_err(EXCP0B_NOSEG, new_ss & 0xfffc);
            cpu_x86_load_seg_cache(env, R_SS, new_ss,
                                   get_seg_base(ss_e1, ss_e2),
                                   get_seg_limit(ss_e1, ss_e2),
                                   ss_e2);
        }

        cpu_x86_load_seg_cache(env, R_CS, new_cs,
                       get_seg_base(e1, e2),
                       get_seg_limit(e1, e2),
                       e2);
        cpu_x86_set_cpl(env, rpl);
        sp = new_esp;
#ifdef TARGET_X86_64
        if (env->hflags & HF_CS64_MASK)
            sp_mask = -1;
        else
#endif
            sp_mask = get_sp_mask(ss_e2);

        /* validate data segments */
        validate_seg(R_ES, rpl);
        validate_seg(R_DS, rpl);
        validate_seg(R_FS, rpl);
        validate_seg(R_GS, rpl);

        sp += addend;
    }
    SET_ESP(sp, sp_mask);
    env->eip = new_eip;
    if (is_iret) {
        /* NOTE: 'cpl' is the _old_ CPL */
        eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK;
        if (cpl == 0)
            eflags_mask |= IOPL_MASK;
        iopl = (env->eflags >> IOPL_SHIFT) & 3;
        if (cpl <= iopl)
            eflags_mask |= IF_MASK;
        if (shift == 0)
            eflags_mask &= 0xffff;
        load_eflags(new_eflags, eflags_mask);
    }
    return;

 return_to_vm86:
    POPL(ssp, sp, sp_mask, new_esp);
    POPL(ssp, sp, sp_mask, new_ss);
    POPL(ssp, sp, sp_mask, new_es);
    POPL(ssp, sp, sp_mask, new_ds);
    POPL(ssp, sp, sp_mask, new_fs);
    POPL(ssp, sp, sp_mask, new_gs);

    /* modify processor state */
    load_eflags(new_eflags, TF_MASK | AC_MASK | ID_MASK |
                IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK | VIP_MASK);
    load_seg_vm(R_CS, new_cs & 0xffff);
    cpu_x86_set_cpl(env, 3);
    load_seg_vm(R_SS, new_ss & 0xffff);
    load_seg_vm(R_ES, new_es & 0xffff);
    load_seg_vm(R_DS, new_ds & 0xffff);
    load_seg_vm(R_FS, new_fs & 0xffff);
    load_seg_vm(R_GS, new_gs & 0xffff);

    env->eip = new_eip & 0xffff;
    ESP = new_esp;
}

void helper_iret_protected(int shift, int next_eip)
{
    int tss_selector, type;
    uint32_t e1, e2;

    /* specific case for TSS */
    if (env->eflags & NT_MASK) {
#ifdef TARGET_X86_64
        if (env->hflags & HF_LMA_MASK)
            raise_exception_err(EXCP0D_GPF, 0);
#endif
        tss_selector = lduw_kernel(env->tr.base + 0);
        if (tss_selector & 4)
            raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
        if (load_segment(&e1, &e2, tss_selector) != 0)
            raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
        type = (e2 >> DESC_TYPE_SHIFT) & 0x17;
        /* NOTE: we check both segment and busy TSS */
        if (type != 3)
            raise_exception_err(EXCP0A_TSS, tss_selector & 0xfffc);
        switch_tss(tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip);
    } else {
        helper_ret_protected(shift, 1, 0);
    }
    env->hflags2 &= ~HF2_NMI_MASK;
#ifdef USE_KQEMU
    if (kqemu_is_ok(env)) {
        CC_OP = CC_OP_EFLAGS;
        env->exception_index = -1;
        cpu_loop_exit();
    }
#endif
}

void helper_lret_protected(int shift, int addend)
{
    helper_ret_protected(shift, 0, addend);
#ifdef USE_KQEMU
    if (kqemu_is_ok(env)) {
        env->exception_index = -1;
        cpu_loop_exit();
    }
#endif
}

void helper_sysenter(void)
{
    if (env->sysenter_cs == 0) {
        raise_exception_err(EXCP0D_GPF, 0);
    }
    env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK);
    cpu_x86_set_cpl(env, 0);

#ifdef TARGET_X86_64
    if (env->hflags & HF_LMA_MASK) {
        cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | DESC_L_MASK);
    } else
#endif
    {
        cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
    }
    cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc,
                           0, 0xffffffff,
                           DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                           DESC_S_MASK |
                           DESC_W_MASK | DESC_A_MASK);
    ESP = env->sysenter_esp;
    EIP = env->sysenter_eip;
}

void helper_sysexit(int dflag)
{
    int cpl;

    cpl = env->hflags & HF_CPL_MASK;
    if (env->sysenter_cs == 0 || cpl != 0) {
        raise_exception_err(EXCP0D_GPF, 0);
    }
    cpu_x86_set_cpl(env, 3);
#ifdef TARGET_X86_64
    if (dflag == 2) {
        cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) | 3,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | DESC_L_MASK);
        cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) | 3,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_W_MASK | DESC_A_MASK);
    } else
#endif
    {
        cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) | 3,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
        cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) | 3,
                               0, 0xffffffff,
                               DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
                               DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
                               DESC_W_MASK | DESC_A_MASK);
    }
    ESP = ECX;
    EIP = EDX;
#ifdef USE_KQEMU
    if (kqemu_is_ok(env)) {
        env->exception_index = -1;
        cpu_loop_exit();
    }
#endif
}

#if defined(CONFIG_USER_ONLY)
target_ulong helper_read_crN(int reg)
{
    return 0;
}

void helper_write_crN(int reg, target_ulong t0)
{
}

void helper_movl_drN_T0(int reg, target_ulong t0)
{
}
#else
target_ulong helper_read_crN(int reg)
{
    target_ulong val;

    helper_svm_check_intercept_param(SVM_EXIT_READ_CR0 + reg, 0);
    switch(reg) {
    default:
        val = env->cr[reg];
        break;
    case 8:
        if (!(env->hflags2 & HF2_VINTR_MASK)) {
            val = cpu_get_apic_tpr(env);
        } else {
            val = env->v_tpr;
        }
        break;
    }
    return val;
}

void helper_write_crN(int reg, target_ulong t0)
{
    helper_svm_check_intercept_param(SVM_EXIT_WRITE_CR0 + reg, 0);
    switch(reg) {
    case 0:
        cpu_x86_update_cr0(env, t0);
        break;
    case 3:
        cpu_x86_update_cr3(env, t0);
        break;
    case 4:
        cpu_x86_update_cr4(env, t0);
        break;
    case 8:
        if (!(env->hflags2 & HF2_VINTR_MASK)) {
            cpu_set_apic_tpr(env, t0);
        }
        env->v_tpr = t0 & 0x0f;
        break;
    default:
        env->cr[reg] = t0;
        break;
    }
}

void helper_movl_drN_T0(int reg, target_ulong t0)
{
    int i;

    if (reg < 4) {
        hw_breakpoint_remove(env, reg);
        env->dr[reg] = t0;
        hw_breakpoint_insert(env, reg);
    } else if (reg == 7) {
        for (i = 0; i < 4; i++)
            hw_breakpoint_remove(env, i);
        env->dr[7] = t0;
        for (i = 0; i < 4; i++)
            hw_breakpoint_insert(env, i);
    } else
        env->dr[reg] = t0;
}
#endif

void helper_lmsw(target_ulong t0)
{
    /* only 4 lower bits of CR0 are modified. PE cannot be set to zero
       if already set to one. */
    t0 = (env->cr[0] & ~0xe) | (t0 & 0xf);
    helper_write_crN(0, t0);
}

void helper_clts(void)
{
    env->cr[0] &= ~CR0_TS_MASK;
    env->hflags &= ~HF_TS_MASK;
}

void helper_invlpg(target_ulong addr)
{
    helper_svm_check_intercept_param(SVM_EXIT_INVLPG, 0);
    tlb_flush_page(env, addr);
}

void helper_rdtsc(void)
{
    uint64_t val;

    if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
        raise_exception(EXCP0D_GPF);
    }
    helper_svm_check_intercept_param(SVM_EXIT_RDTSC, 0);

    val = cpu_get_tsc(env) + env->tsc_offset;
    EAX = (uint32_t)(val);
    EDX = (uint32_t)(val >> 32);
}

void helper_rdpmc(void)
{
    if ((env->cr[4] & CR4_PCE_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
        raise_exception(EXCP0D_GPF);
    }
    helper_svm_check_intercept_param(SVM_EXIT_RDPMC, 0);
    
    /* currently unimplemented */
    raise_exception_err(EXCP06_ILLOP, 0);
}

#if defined(CONFIG_USER_ONLY)
void helper_wrmsr(void)
{
}

void helper_rdmsr(void)
{
}
#else
void helper_wrmsr(void)
{
    uint64_t val;

    helper_svm_check_intercept_param(SVM_EXIT_MSR, 1);

    val = ((uint32_t)EAX) | ((uint64_t)((uint32_t)EDX) << 32);

    switch((uint32_t)ECX) {
    case MSR_IA32_SYSENTER_CS:
        env->sysenter_cs = val & 0xffff;
        break;
    case MSR_IA32_SYSENTER_ESP:
        env->sysenter_esp = val;
        break;
    case MSR_IA32_SYSENTER_EIP:
        env->sysenter_eip = val;
        break;
    case MSR_IA32_APICBASE:
        cpu_set_apic_base(env, val);
        break;
    case MSR_EFER:
        {
            uint64_t update_mask;
            update_mask = 0;
            if (env->cpuid_ext2_features & CPUID_EXT2_SYSCALL)
                update_mask |= MSR_EFER_SCE;
            if (env->cpuid_ext2_features & CPUID_EXT2_LM)
                update_mask |= MSR_EFER_LME;
            if (env->cpuid_ext2_features & CPUID_EXT2_FFXSR)
                update_mask |= MSR_EFER_FFXSR;
            if (env->cpuid_ext2_features & CPUID_EXT2_NX)
                update_mask |= MSR_EFER_NXE;
            if (env->cpuid_ext3_features & CPUID_EXT3_SVM)
                update_mask |= MSR_EFER_SVME;
            cpu_load_efer(env, (env->efer & ~update_mask) |
                          (val & update_mask));
        }
        break;
    case MSR_STAR:
        env->star = val;
        break;
    case MSR_PAT:
        env->pat = val;
        break;
    case MSR_VM_HSAVE_PA:
        env->vm_hsave = val;
        break;
#ifdef TARGET_X86_64
    case MSR_LSTAR:
        env->lstar = val;
        break;
    case MSR_CSTAR:
        env->cstar = val;
        break;
    case MSR_FMASK:
        env->fmask = val;
        break;
    case MSR_FSBASE:
        env->segs[R_FS].base = val;
        break;
    case MSR_GSBASE:
        env->segs[R_GS].base = val;
        break;
    case MSR_KERNELGSBASE:
        env->kernelgsbase = val;
        break;
#endif
    default:
        /* XXX: exception ? */
        break;
    }
}

void helper_rdmsr(void)
{
    uint64_t val;

    helper_svm_check_intercept_param(SVM_EXIT_MSR, 0);

    switch((uint32_t)ECX) {
    case MSR_IA32_SYSENTER_CS:
        val = env->sysenter_cs;
        break;
    case MSR_IA32_SYSENTER_ESP:
        val = env->sysenter_esp;
        break;
    case MSR_IA32_SYSENTER_EIP:
        val = env->sysenter_eip;
        break;
    case MSR_IA32_APICBASE:
        val = cpu_get_apic_base(env);
        break;
    case MSR_EFER:
        val = env->efer;
        break;
    case MSR_STAR:
        val = env->star;
        break;
    case MSR_PAT:
        val = env->pat;
        break;
    case MSR_VM_HSAVE_PA:
        val = env->vm_hsave;
        break;
    case MSR_IA32_PERF_STATUS:
        /* tsc_increment_by_tick */
        val = 1000ULL;
        /* CPU multiplier */
        val |= (((uint64_t)4ULL) << 40);
        break;
#ifdef TARGET_X86_64
    case MSR_LSTAR:
        val = env->lstar;
        break;
    case MSR_CSTAR:
        val = env->cstar;
        break;
    case MSR_FMASK:
        val = env->fmask;
        break;
    case MSR_FSBASE:
        val = env->segs[R_FS].base;
        break;
    case MSR_GSBASE:
        val = env->segs[R_GS].base;
        break;
    case MSR_KERNELGSBASE:
        val = env->kernelgsbase;
        break;
#endif
#ifdef USE_KQEMU
    case MSR_QPI_COMMBASE:
        if (env->kqemu_enabled) {
            val = kqemu_comm_base;
        } else {
            val = 0;
        }
        break;
#endif
    default:
        /* XXX: exception ? */
        val = 0;
        break;
    }
    EAX = (uint32_t)(val);
    EDX = (uint32_t)(val >> 32);
}
#endif

target_ulong helper_lsl(target_ulong selector1)
{
    unsigned int limit;
    uint32_t e1, e2, eflags, selector;
    int rpl, dpl, cpl, type;

    selector = selector1 & 0xffff;
    eflags = helper_cc_compute_all(CC_OP);
    if (load_segment(&e1, &e2, selector) != 0)
        goto fail;
    rpl = selector & 3;
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    if (e2 & DESC_S_MASK) {
        if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
            /* conforming */
        } else {
            if (dpl < cpl || dpl < rpl)
                goto fail;
        }
    } else {
        type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
        switch(type) {
        case 1:
        case 2:
        case 3:
        case 9:
        case 11:
            break;
        default:
            goto fail;
        }
        if (dpl < cpl || dpl < rpl) {
        fail:
            CC_SRC = eflags & ~CC_Z;
            return 0;
        }
    }
    limit = get_seg_limit(e1, e2);
    CC_SRC = eflags | CC_Z;
    return limit;
}

target_ulong helper_lar(target_ulong selector1)
{
    uint32_t e1, e2, eflags, selector;
    int rpl, dpl, cpl, type;

    selector = selector1 & 0xffff;
    eflags = helper_cc_compute_all(CC_OP);
    if ((selector & 0xfffc) == 0)
        goto fail;
    if (load_segment(&e1, &e2, selector) != 0)
        goto fail;
    rpl = selector & 3;
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    if (e2 & DESC_S_MASK) {
        if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
            /* conforming */
        } else {
            if (dpl < cpl || dpl < rpl)
                goto fail;
        }
    } else {
        type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
        switch(type) {
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        case 9:
        case 11:
        case 12:
            break;
        default:
            goto fail;
        }
        if (dpl < cpl || dpl < rpl) {
        fail:
            CC_SRC = eflags & ~CC_Z;
            return 0;
        }
    }
    CC_SRC = eflags | CC_Z;
    return e2 & 0x00f0ff00;
}

void helper_verr(target_ulong selector1)
{
    uint32_t e1, e2, eflags, selector;
    int rpl, dpl, cpl;

    selector = selector1 & 0xffff;
    eflags = helper_cc_compute_all(CC_OP);
    if ((selector & 0xfffc) == 0)
        goto fail;
    if (load_segment(&e1, &e2, selector) != 0)
        goto fail;
    if (!(e2 & DESC_S_MASK))
        goto fail;
    rpl = selector & 3;
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    if (e2 & DESC_CS_MASK) {
        if (!(e2 & DESC_R_MASK))
            goto fail;
        if (!(e2 & DESC_C_MASK)) {
            if (dpl < cpl || dpl < rpl)
                goto fail;
        }
    } else {
        if (dpl < cpl || dpl < rpl) {
        fail:
            CC_SRC = eflags & ~CC_Z;
            return;
        }
    }
    CC_SRC = eflags | CC_Z;
}

void helper_verw(target_ulong selector1)
{
    uint32_t e1, e2, eflags, selector;
    int rpl, dpl, cpl;

    selector = selector1 & 0xffff;
    eflags = helper_cc_compute_all(CC_OP);
    if ((selector & 0xfffc) == 0)
        goto fail;
    if (load_segment(&e1, &e2, selector) != 0)
        goto fail;
    if (!(e2 & DESC_S_MASK))
        goto fail;
    rpl = selector & 3;
    dpl = (e2 >> DESC_DPL_SHIFT) & 3;
    cpl = env->hflags & HF_CPL_MASK;
    if (e2 & DESC_CS_MASK) {
        goto fail;
    } else {
        if (dpl < cpl || dpl < rpl)
            goto fail;
        if (!(e2 & DESC_W_MASK)) {
        fail:
            CC_SRC = eflags & ~CC_Z;
            return;
        }
    }
    CC_SRC = eflags | CC_Z;
}

/* x87 FPU helpers */

static void fpu_set_exception(int mask)
{
    env->fpus |= mask;
    if (env->fpus & (~env->fpuc & FPUC_EM))
        env->fpus |= FPUS_SE | FPUS_B;
}

static inline CPU86_LDouble helper_fdiv(CPU86_LDouble a, CPU86_LDouble b)
{
    if (b == 0.0)
        fpu_set_exception(FPUS_ZE);
    return a / b;
}

static void fpu_raise_exception(void)
{
    if (env->cr[0] & CR0_NE_MASK) {
        raise_exception(EXCP10_COPR);
    }
#if !defined(CONFIG_USER_ONLY)
    else {
        cpu_set_ferr(env);
    }
#endif
}

void helper_flds_FT0(uint32_t val)
{
    union {
        float32 f;
        uint32_t i;
    } u;
    u.i = val;
    FT0 = float32_to_floatx(u.f, &env->fp_status);
}

void helper_fldl_FT0(uint64_t val)
{
    union {
        float64 f;
        uint64_t i;
    } u;
    u.i = val;
    FT0 = float64_to_floatx(u.f, &env->fp_status);
}

void helper_fildl_FT0(int32_t val)
{
    FT0 = int32_to_floatx(val, &env->fp_status);
}

void helper_flds_ST0(uint32_t val)
{
    int new_fpstt;
    union {
        float32 f;
        uint32_t i;
    } u;
    new_fpstt = (env->fpstt - 1) & 7;
    u.i = val;
    env->fpregs[new_fpstt].d = float32_to_floatx(u.f, &env->fp_status);
    env->fpstt = new_fpstt;
    env->fptags[new_fpstt] = 0; /* validate stack entry */
}

void helper_fldl_ST0(uint64_t val)
{
    int new_fpstt;
    union {
        float64 f;
        uint64_t i;
    } u;
    new_fpstt = (env->fpstt - 1) & 7;
    u.i = val;
    env->fpregs[new_fpstt].d = float64_to_floatx(u.f, &env->fp_status);
    env->fpstt = new_fpstt;
    env->fptags[new_fpstt] = 0; /* validate stack entry */
}

void helper_fildl_ST0(int32_t val)
{
    int new_fpstt;
    new_fpstt = (env->fpstt - 1) & 7;
    env->fpregs[new_fpstt].d = int32_to_floatx(val, &env->fp_status);
    env->fpstt = new_fpstt;
    env->fptags[new_fpstt] = 0; /* validate stack entry */
}

void helper_fildll_ST0(int64_t val)
{
    int new_fpstt;
    new_fpstt = (env->fpstt - 1) & 7;
    env->fpregs[new_fpstt].d = int64_to_floatx(val, &env->fp_status);
    env->fpstt = new_fpstt;
    env->fptags[new_fpstt] = 0; /* validate stack entry */
}

uint32_t helper_fsts_ST0(void)
{
    union {
        float32 f;
        uint32_t i;
    } u;
    u.f = floatx_to_float32(ST0, &env->fp_status);
    return u.i;
}

uint64_t helper_fstl_ST0(void)
{
    union {
        float64 f;
        uint64_t i;
    } u;
    u.f = floatx_to_float64(ST0, &env->fp_status);
    return u.i;
}

int32_t helper_fist_ST0(void)
{
    int32_t val;
    val = floatx_to_int32(ST0, &env->fp_status);
    if (val != (int16_t)val)
        val = -32768;
    return val;
}

int32_t helper_fistl_ST0(void)
{
    int32_t val;
    val = floatx_to_int32(ST0, &env->fp_status);
    return val;
}

int64_t helper_fistll_ST0(void)
{
    int64_t val;
    val = floatx_to_int64(ST0, &env->fp_status);
    return val;
}

int32_t helper_fistt_ST0(void)
{
    int32_t val;
    val = floatx_to_int32_round_to_zero(ST0, &env->fp_status);
    if (val != (int16_t)val)
        val = -32768;
    return val;
}

int32_t helper_fisttl_ST0(void)
{
    int32_t val;
    val = floatx_to_int32_round_to_zero(ST0, &env->fp_status);
    return val;
}

int64_t helper_fisttll_ST0(void)
{
    int64_t val;
    val = floatx_to_int64_round_to_zero(ST0, &env->fp_status);
    return val;
}

void helper_fldt_ST0(target_ulong ptr)
{
    int new_fpstt;
    new_fpstt = (env->fpstt - 1) & 7;
    env->fpregs[new_fpstt].d = helper_fldt(ptr);
    env->fpstt = new_fpstt;
    env->fptags[new_fpstt] = 0; /* validate stack entry */
}

void helper_fstt_ST0(target_ulong ptr)
{
    helper_fstt(ST0, ptr);
}

void helper_fpush(void)
{
    fpush();
}

void helper_fpop(void)
{
    fpop();
}

void helper_fdecstp(void)
{
    env->fpstt = (env->fpstt - 1) & 7;
    env->fpus &= (~0x4700);
}

void helper_fincstp(void)
{
    env->fpstt = (env->fpstt + 1) & 7;
    env->fpus &= (~0x4700);
}

/* FPU move */

void helper_ffree_STN(int st_index)
{
    env->fptags[(env->fpstt + st_index) & 7] = 1;
}

void helper_fmov_ST0_FT0(void)
{
    ST0 = FT0;
}

void helper_fmov_FT0_STN(int st_index)
{
    FT0 = ST(st_index);
}

void helper_fmov_ST0_STN(int st_index)
{
    ST0 = ST(st_index);
}

void helper_fmov_STN_ST0(int st_index)
{
    ST(st_index) = ST0;
}

void helper_fxchg_ST0_STN(int st_index)
{
    CPU86_LDouble tmp;
    tmp = ST(st_index);
    ST(st_index) = ST0;
    ST0 = tmp;
}

/* FPU operations */

static const int fcom_ccval[4] = {0x0100, 0x4000, 0x0000, 0x4500};

void helper_fcom_ST0_FT0(void)
{
    int ret;

    ret = floatx_compare(ST0, FT0, &env->fp_status);
    env->fpus = (env->fpus & ~0x4500) | fcom_ccval[ret + 1];
}

void helper_fucom_ST0_FT0(void)
{
    int ret;

    ret = floatx_compare_quiet(ST0, FT0, &env->fp_status);
    env->fpus = (env->fpus & ~0x4500) | fcom_ccval[ret+ 1];
}

static const int fcomi_ccval[4] = {CC_C, CC_Z, 0, CC_Z | CC_P | CC_C};

void helper_fcomi_ST0_FT0(void)
{
    int eflags;
    int ret;

    ret = floatx_compare(ST0, FT0, &env->fp_status);
    eflags = helper_cc_compute_all(CC_OP);
    eflags = (eflags & ~(CC_Z | CC_P | CC_C)) | fcomi_ccval[ret + 1];
    CC_SRC = eflags;
}

void helper_fucomi_ST0_FT0(void)
{
    int eflags;
    int ret;

    ret = floatx_compare_quiet(ST0, FT0, &env->fp_status);
    eflags = helper_cc_compute_all(CC_OP);
    eflags = (eflags & ~(CC_Z | CC_P | CC_C)) | fcomi_ccval[ret + 1];
    CC_SRC = eflags;
}

void helper_fadd_ST0_FT0(void)
{
    ST0 += FT0;
}

void helper_fmul_ST0_FT0(void)
{
    ST0 *= FT0;
}

void helper_fsub_ST0_FT0(void)
{
    ST0 -= FT0;
}

void helper_fsubr_ST0_FT0(void)
{
    ST0 = FT0 - ST0;
}

void helper_fdiv_ST0_FT0(void)
{
    ST0 = helper_fdiv(ST0, FT0);
}

void helper_fdivr_ST0_FT0(void)
{
    ST0 = helper_fdiv(FT0, ST0);
}

/* fp operations between STN and ST0 */

void helper_fadd_STN_ST0(int st_index)
{
    ST(st_index) += ST0;
}

void helper_fmul_STN_ST0(int st_index)
{
    ST(st_index) *= ST0;
}

void helper_fsub_STN_ST0(int st_index)
{
    ST(st_index) -= ST0;
}

void helper_fsubr_STN_ST0(int st_index)
{
    CPU86_LDouble *p;
    p = &ST(st_index);
    *p = ST0 - *p;
}

void helper_fdiv_STN_ST0(int st_index)
{
    CPU86_LDouble *p;
    p = &ST(st_index);
    *p = helper_fdiv(*p, ST0);
}

void helper_fdivr_STN_ST0(int st_index)
{
    CPU86_LDouble *p;
    p = &ST(st_index);
    *p = helper_fdiv(ST0, *p);
}

/* misc FPU operations */
void helper_fchs_ST0(void)
{
    ST0 = floatx_chs(ST0);
}

void helper_fabs_ST0(void)
{
    ST0 = floatx_abs(ST0);
}

void helper_fld1_ST0(void)
{
    ST0 = f15rk[1];
}

void helper_fldl2t_ST0(void)
{
    ST0 = f15rk[6];
}

void helper_fldl2e_ST0(void)
{
    ST0 = f15rk[5];
}

void helper_fldpi_ST0(void)
{
    ST0 = f15rk[2];
}

void helper_fldlg2_ST0(void)
{
    ST0 = f15rk[3];
}

void helper_fldln2_ST0(void)
{
    ST0 = f15rk[4];
}

void helper_fldz_ST0(void)
{
    ST0 = f15rk[0];
}

void helper_fldz_FT0(void)
{
    FT0 = f15rk[0];
}

uint32_t helper_fnstsw(void)
{
    return (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
}

uint32_t helper_fnstcw(void)
{
    return env->fpuc;
}

static void update_fp_status(void)
{
    int rnd_type;

    /* set rounding mode */
    switch(env->fpuc & RC_MASK) {
    default:
    case RC_NEAR:
        rnd_type = float_round_nearest_even;
        break;
    case RC_DOWN:
        rnd_type = float_round_down;
        break;
    case RC_UP:
        rnd_type = float_round_up;
        break;
    case RC_CHOP:
        rnd_type = float_round_to_zero;
        break;
    }
    set_float_rounding_mode(rnd_type, &env->fp_status);
#ifdef FLOATX80
    switch((env->fpuc >> 8) & 3) {
    case 0:
        rnd_type = 32;
        break;
    case 2:
        rnd_type = 64;
        break;
    case 3:
    default:
        rnd_type = 80;
        break;
    }
    set_floatx80_rounding_precision(rnd_type, &env->fp_status);
#endif
}

void helper_fldcw(uint32_t val)
{
    env->fpuc = val;
    update_fp_status();
}

void helper_fclex(void)
{
    env->fpus &= 0x7f00;
}

void helper_fwait(void)
{
    if (env->fpus & FPUS_SE)
        fpu_raise_exception();
}

void helper_fninit(void)
{
    env->fpus = 0;
    env->fpstt = 0;
    env->fpuc = 0x37f;
    env->fptags[0] = 1;
    env->fptags[1] = 1;
    env->fptags[2] = 1;
    env->fptags[3] = 1;
    env->fptags[4] = 1;
    env->fptags[5] = 1;
    env->fptags[6] = 1;
    env->fptags[7] = 1;
}

/* BCD ops */

void helper_fbld_ST0(target_ulong ptr)
{
    CPU86_LDouble tmp;
    uint64_t val;
    unsigned int v;
    int i;

    val = 0;
    for(i = 8; i >= 0; i--) {
        v = ldub(ptr + i);
        val = (val * 100) + ((v >> 4) * 10) + (v & 0xf);
    }
    tmp = val;
    if (ldub(ptr + 9) & 0x80)
        tmp = -tmp;
    fpush();
    ST0 = tmp;
}

void helper_fbst_ST0(target_ulong ptr)
{
    int v;
    target_ulong mem_ref, mem_end;
    int64_t val;

    val = floatx_to_int64(ST0, &env->fp_status);
    mem_ref = ptr;
    mem_end = mem_ref + 9;
    if (val < 0) {
        stb(mem_end, 0x80);
        val = -val;
    } else {
        stb(mem_end, 0x00);
    }
    while (mem_ref < mem_end) {
        if (val == 0)
            break;
        v = val % 100;
        val = val / 100;
        v = ((v / 10) << 4) | (v % 10);
        stb(mem_ref++, v);
    }
    while (mem_ref < mem_end) {
        stb(mem_ref++, 0);
    }
}

void helper_f2xm1(void)
{
    ST0 = pow(2.0,ST0) - 1.0;
}

void helper_fyl2x(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if (fptemp>0.0){
        fptemp = log(fptemp)/log(2.0);	 /* log2(ST) */
        ST1 *= fptemp;
        fpop();
    } else {
        env->fpus &= (~0x4700);
        env->fpus |= 0x400;
    }
}

void helper_fptan(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if((fptemp > MAXTAN)||(fptemp < -MAXTAN)) {
        env->fpus |= 0x400;
    } else {
        ST0 = tan(fptemp);
        fpush();
        ST0 = 1.0;
        env->fpus &= (~0x400);  /* C2 <-- 0 */
        /* the above code is for  |arg| < 2**52 only */
    }
}

void helper_fpatan(void)
{
    CPU86_LDouble fptemp, fpsrcop;

    fpsrcop = ST1;
    fptemp = ST0;
    ST1 = atan2(fpsrcop,fptemp);
    fpop();
}

void helper_fxtract(void)
{
    CPU86_LDoubleU temp;
    unsigned int expdif;

    temp.d = ST0;
    expdif = EXPD(temp) - EXPBIAS;
    /*DP exponent bias*/
    ST0 = expdif;
    fpush();
    BIASEXPONENT(temp);
    ST0 = temp.d;
}

void helper_fprem1(void)
{
    CPU86_LDouble dblq, fpsrcop, fptemp;
    CPU86_LDoubleU fpsrcop1, fptemp1;
    int expdif;
    signed long long int q;

    if (isinf(ST0) || isnan(ST0) || isnan(ST1) || (ST1 == 0.0)) {
        ST0 = 0.0 / 0.0; /* NaN */
        env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
        return;
    }

    fpsrcop = ST0;
    fptemp = ST1;
    fpsrcop1.d = fpsrcop;
    fptemp1.d = fptemp;
    expdif = EXPD(fpsrcop1) - EXPD(fptemp1);

    if (expdif < 0) {
        /* optimisation? taken from the AMD docs */
        env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
        /* ST0 is unchanged */
        return;
    }

    if (expdif < 53) {
        dblq = fpsrcop / fptemp;
        /* round dblq towards nearest integer */
        dblq = rint(dblq);
        ST0 = fpsrcop - fptemp * dblq;

        /* convert dblq to q by truncating towards zero */
        if (dblq < 0.0)
           q = (signed long long int)(-dblq);
        else
           q = (signed long long int)dblq;

        env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
                                /* (C0,C3,C1) <-- (q2,q1,q0) */
        env->fpus |= (q & 0x4) << (8 - 2);  /* (C0) <-- q2 */
        env->fpus |= (q & 0x2) << (14 - 1); /* (C3) <-- q1 */
        env->fpus |= (q & 0x1) << (9 - 0);  /* (C1) <-- q0 */
    } else {
        env->fpus |= 0x400;  /* C2 <-- 1 */
        fptemp = pow(2.0, expdif - 50);
        fpsrcop = (ST0 / ST1) / fptemp;
        /* fpsrcop = integer obtained by chopping */
        fpsrcop = (fpsrcop < 0.0) ?
                  -(floor(fabs(fpsrcop))) : floor(fpsrcop);
        ST0 -= (ST1 * fpsrcop * fptemp);
    }
}

void helper_fprem(void)
{
    CPU86_LDouble dblq, fpsrcop, fptemp;
    CPU86_LDoubleU fpsrcop1, fptemp1;
    int expdif;
    signed long long int q;

    if (isinf(ST0) || isnan(ST0) || isnan(ST1) || (ST1 == 0.0)) {
       ST0 = 0.0 / 0.0; /* NaN */
       env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
       return;
    }

    fpsrcop = (CPU86_LDouble)ST0;
    fptemp = (CPU86_LDouble)ST1;
    fpsrcop1.d = fpsrcop;
    fptemp1.d = fptemp;
    expdif = EXPD(fpsrcop1) - EXPD(fptemp1);

    if (expdif < 0) {
        /* optimisation? taken from the AMD docs */
        env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
        /* ST0 is unchanged */
        return;
    }

    if ( expdif < 53 ) {
        dblq = fpsrcop/*ST0*/ / fptemp/*ST1*/;
        /* round dblq towards zero */
        dblq = (dblq < 0.0) ? ceil(dblq) : floor(dblq);
        ST0 = fpsrcop/*ST0*/ - fptemp * dblq;

        /* convert dblq to q by truncating towards zero */
        if (dblq < 0.0)
           q = (signed long long int)(-dblq);
        else
           q = (signed long long int)dblq;

        env->fpus &= (~0x4700); /* (C3,C2,C1,C0) <-- 0000 */
                                /* (C0,C3,C1) <-- (q2,q1,q0) */
        env->fpus |= (q & 0x4) << (8 - 2);  /* (C0) <-- q2 */
        env->fpus |= (q & 0x2) << (14 - 1); /* (C3) <-- q1 */
        env->fpus |= (q & 0x1) << (9 - 0);  /* (C1) <-- q0 */
    } else {
        int N = 32 + (expdif % 32); /* as per AMD docs */
        env->fpus |= 0x400;  /* C2 <-- 1 */
        fptemp = pow(2.0, (double)(expdif - N));
        fpsrcop = (ST0 / ST1) / fptemp;
        /* fpsrcop = integer obtained by chopping */
        fpsrcop = (fpsrcop < 0.0) ?
                  -(floor(fabs(fpsrcop))) : floor(fpsrcop);
        ST0 -= (ST1 * fpsrcop * fptemp);
    }
}

void helper_fyl2xp1(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if ((fptemp+1.0)>0.0) {
        fptemp = log(fptemp+1.0) / log(2.0); /* log2(ST+1.0) */
        ST1 *= fptemp;
        fpop();
    } else {
        env->fpus &= (~0x4700);
        env->fpus |= 0x400;
    }
}

void helper_fsqrt(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if (fptemp<0.0) {
        env->fpus &= (~0x4700);  /* (C3,C2,C1,C0) <-- 0000 */
        env->fpus |= 0x400;
    }
    ST0 = sqrt(fptemp);
}

void helper_fsincos(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if ((fptemp > MAXTAN)||(fptemp < -MAXTAN)) {
        env->fpus |= 0x400;
    } else {
        ST0 = sin(fptemp);
        fpush();
        ST0 = cos(fptemp);
        env->fpus &= (~0x400);  /* C2 <-- 0 */
        /* the above code is for  |arg| < 2**63 only */
    }
}

void helper_frndint(void)
{
    ST0 = floatx_round_to_int(ST0, &env->fp_status);
}

void helper_fscale(void)
{
    ST0 = ldexp (ST0, (int)(ST1));
}

void helper_fsin(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if ((fptemp > MAXTAN)||(fptemp < -MAXTAN)) {
        env->fpus |= 0x400;
    } else {
        ST0 = sin(fptemp);
        env->fpus &= (~0x400);  /* C2 <-- 0 */
        /* the above code is for  |arg| < 2**53 only */
    }
}

void helper_fcos(void)
{
    CPU86_LDouble fptemp;

    fptemp = ST0;
    if((fptemp > MAXTAN)||(fptemp < -MAXTAN)) {
        env->fpus |= 0x400;
    } else {
        ST0 = cos(fptemp);
        env->fpus &= (~0x400);  /* C2 <-- 0 */
        /* the above code is for  |arg5 < 2**63 only */
    }
}

void helper_fxam_ST0(void)
{
    CPU86_LDoubleU temp;
    int expdif;

    temp.d = ST0;

    env->fpus &= (~0x4700);  /* (C3,C2,C1,C0) <-- 0000 */
    if (SIGND(temp))
        env->fpus |= 0x200; /* C1 <-- 1 */

    /* XXX: test fptags too */
    expdif = EXPD(temp);
    if (expdif == MAXEXPD) {
#ifdef USE_X86LDOUBLE
        if (MANTD(temp) == 0x8000000000000000ULL)
#else
        if (MANTD(temp) == 0)
#endif
            env->fpus |=  0x500 /*Infinity*/;
        else
            env->fpus |=  0x100 /*NaN*/;
    } else if (expdif == 0) {
        if (MANTD(temp) == 0)
            env->fpus |=  0x4000 /*Zero*/;
        else
            env->fpus |= 0x4400 /*Denormal*/;
    } else {
        env->fpus |= 0x400;
    }
}

void helper_fstenv(target_ulong ptr, int data32)
{
    int fpus, fptag, exp, i;
    uint64_t mant;
    CPU86_LDoubleU tmp;

    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
    fptag = 0;
    for (i=7; i>=0; i--) {
	fptag <<= 2;
	if (env->fptags[i]) {
            fptag |= 3;
	} else {
            tmp.d = env->fpregs[i].d;
            exp = EXPD(tmp);
            mant = MANTD(tmp);
            if (exp == 0 && mant == 0) {
                /* zero */
	        fptag |= 1;
	    } else if (exp == 0 || exp == MAXEXPD
#ifdef USE_X86LDOUBLE
                       || (mant & (1LL << 63)) == 0
#endif
                       ) {
                /* NaNs, infinity, denormal */
                fptag |= 2;
            }
        }
    }
    if (data32) {
        /* 32 bit */
        stl(ptr, env->fpuc);
        stl(ptr + 4, fpus);
        stl(ptr + 8, fptag);
        stl(ptr + 12, 0); /* fpip */
        stl(ptr + 16, 0); /* fpcs */
        stl(ptr + 20, 0); /* fpoo */
        stl(ptr + 24, 0); /* fpos */
    } else {
        /* 16 bit */
        stw(ptr, env->fpuc);
        stw(ptr + 2, fpus);
        stw(ptr + 4, fptag);
        stw(ptr + 6, 0);
        stw(ptr + 8, 0);
        stw(ptr + 10, 0);
        stw(ptr + 12, 0);
    }
}

void helper_fldenv(target_ulong ptr, int data32)
{
    int i, fpus, fptag;

    if (data32) {
	env->fpuc = lduw(ptr);
        fpus = lduw(ptr + 4);
        fptag = lduw(ptr + 8);
    }
    else {
	env->fpuc = lduw(ptr);
        fpus = lduw(ptr + 2);
        fptag = lduw(ptr + 4);
    }
    env->fpstt = (fpus >> 11) & 7;
    env->fpus = fpus & ~0x3800;
    for(i = 0;i < 8; i++) {
        env->fptags[i] = ((fptag & 3) == 3);
        fptag >>= 2;
    }
}

void helper_fsave(target_ulong ptr, int data32)
{
    CPU86_LDouble tmp;
    int i;

    helper_fstenv(ptr, data32);

    ptr += (14 << data32);
    for(i = 0;i < 8; i++) {
        tmp = ST(i);
        helper_fstt(tmp, ptr);
        ptr += 10;
    }

    /* fninit */
    env->fpus = 0;
    env->fpstt = 0;
    env->fpuc = 0x37f;
    env->fptags[0] = 1;
    env->fptags[1] = 1;
    env->fptags[2] = 1;
    env->fptags[3] = 1;
    env->fptags[4] = 1;
    env->fptags[5] = 1;
    env->fptags[6] = 1;
    env->fptags[7] = 1;
}

void helper_frstor(target_ulong ptr, int data32)
{
    CPU86_LDouble tmp;
    int i;

    helper_fldenv(ptr, data32);
    ptr += (14 << data32);

    for(i = 0;i < 8; i++) {
        tmp = helper_fldt(ptr);
        ST(i) = tmp;
        ptr += 10;
    }
}

void helper_fxsave(target_ulong ptr, int data64)
{
    int fpus, fptag, i, nb_xmm_regs;
    CPU86_LDouble tmp;
    target_ulong addr;

    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
    fptag = 0;
    for(i = 0; i < 8; i++) {
        fptag |= (env->fptags[i] << i);
    }
    stw(ptr, env->fpuc);
    stw(ptr + 2, fpus);
    stw(ptr + 4, fptag ^ 0xff);
#ifdef TARGET_X86_64
    if (data64) {
        stq(ptr + 0x08, 0); /* rip */
        stq(ptr + 0x10, 0); /* rdp */
    } else 
#endif
    {
        stl(ptr + 0x08, 0); /* eip */
        stl(ptr + 0x0c, 0); /* sel  */
        stl(ptr + 0x10, 0); /* dp */
        stl(ptr + 0x14, 0); /* sel  */
    }

    addr = ptr + 0x20;
    for(i = 0;i < 8; i++) {
        tmp = ST(i);
        helper_fstt(tmp, addr);
        addr += 16;
    }

    if (env->cr[4] & CR4_OSFXSR_MASK) {
        /* XXX: finish it */
        stl(ptr + 0x18, env->mxcsr); /* mxcsr */
        stl(ptr + 0x1c, 0x0000ffff); /* mxcsr_mask */
        if (env->hflags & HF_CS64_MASK)
            nb_xmm_regs = 16;
        else
            nb_xmm_regs = 8;
        addr = ptr + 0xa0;
        for(i = 0; i < nb_xmm_regs; i++) {
            stq(addr, env->xmm_regs[i].XMM_Q(0));
            stq(addr + 8, env->xmm_regs[i].XMM_Q(1));
            addr += 16;
        }
    }
}

void helper_fxrstor(target_ulong ptr, int data64)
{
    int i, fpus, fptag, nb_xmm_regs;
    CPU86_LDouble tmp;
    target_ulong addr;

    env->fpuc = lduw(ptr);
    fpus = lduw(ptr + 2);
    fptag = lduw(ptr + 4);
    env->fpstt = (fpus >> 11) & 7;
    env->fpus = fpus & ~0x3800;
    fptag ^= 0xff;
    for(i = 0;i < 8; i++) {
        env->fptags[i] = ((fptag >> i) & 1);
    }

    addr = ptr + 0x20;
    for(i = 0;i < 8; i++) {
        tmp = helper_fldt(addr);
        ST(i) = tmp;
        addr += 16;
    }

    if (env->cr[4] & CR4_OSFXSR_MASK) {
        /* XXX: finish it */
        env->mxcsr = ldl(ptr + 0x18);
        //ldl(ptr + 0x1c);
        if (env->hflags & HF_CS64_MASK)
            nb_xmm_regs = 16;
        else
            nb_xmm_regs = 8;
        addr = ptr + 0xa0;
        for(i = 0; i < nb_xmm_regs; i++) {
            env->xmm_regs[i].XMM_Q(0) = ldq(addr);
            env->xmm_regs[i].XMM_Q(1) = ldq(addr + 8);
            addr += 16;
        }
    }
}

#ifndef USE_X86LDOUBLE

void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)
{
    CPU86_LDoubleU temp;
    int e;

    temp.d = f;
    /* mantissa */
    *pmant = (MANTD(temp) << 11) | (1LL << 63);
    /* exponent + sign */
    e = EXPD(temp) - EXPBIAS + 16383;
    e |= SIGND(temp) >> 16;
    *pexp = e;
}

CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)
{
    CPU86_LDoubleU temp;
    int e;
    uint64_t ll;

    /* XXX: handle overflow ? */
    e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */
    e |= (upper >> 4) & 0x800; /* sign */
    ll = (mant >> 11) & ((1LL << 52) - 1);
#ifdef __arm__
    temp.l.upper = (e << 20) | (ll >> 32);
    temp.l.lower = ll;
#else
    temp.ll = ll | ((uint64_t)e << 52);
#endif
    return temp.d;
}

#else

void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)
{
    CPU86_LDoubleU temp;

    temp.d = f;
    *pmant = temp.l.lower;
    *pexp = temp.l.upper;
}

CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)
{
    CPU86_LDoubleU temp;

    temp.l.upper = upper;
    temp.l.lower = mant;
    return temp.d;
}
#endif

#ifdef TARGET_X86_64

//#define DEBUG_MULDIV

static void add128(uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
{
    *plow += a;
    /* carry test */
    if (*plow < a)
        (*phigh)++;
    *phigh += b;
}

static void neg128(uint64_t *plow, uint64_t *phigh)
{
    *plow = ~ *plow;
    *phigh = ~ *phigh;
    add128(plow, phigh, 1, 0);
}

/* return TRUE if overflow */
static int div64(uint64_t *plow, uint64_t *phigh, uint64_t b)
{
    uint64_t q, r, a1, a0;
    int i, qb, ab;

    a0 = *plow;
    a1 = *phigh;
    if (a1 == 0) {
        q = a0 / b;
        r = a0 % b;
        *plow = q;
        *phigh = r;
    } else {
        if (a1 >= b)
            return 1;
        /* XXX: use a better algorithm */
        for(i = 0; i < 64; i++) {
            ab = a1 >> 63;
            a1 = (a1 << 1) | (a0 >> 63);
            if (ab || a1 >= b) {
                a1 -= b;
                qb = 1;
            } else {
                qb = 0;
            }
            a0 = (a0 << 1) | qb;
        }
#if defined(DEBUG_MULDIV)
        printf("div: 0x%016" PRIx64 "%016" PRIx64 " / 0x%016" PRIx64 ": q=0x%016" PRIx64 " r=0x%016" PRIx64 "\n",
               *phigh, *plow, b, a0, a1);
#endif
        *plow = a0;
        *phigh = a1;
    }
    return 0;
}

/* return TRUE if overflow */
static int idiv64(uint64_t *plow, uint64_t *phigh, int64_t b)
{
    int sa, sb;
    sa = ((int64_t)*phigh < 0);
    if (sa)
        neg128(plow, phigh);
    sb = (b < 0);
    if (sb)
        b = -b;
    if (div64(plow, phigh, b) != 0)
        return 1;
    if (sa ^ sb) {
        if (*plow > (1ULL << 63))
            return 1;
        *plow = - *plow;
    } else {
        if (*plow >= (1ULL << 63))
            return 1;
    }
    if (sa)
        *phigh = - *phigh;
    return 0;
}

void helper_mulq_EAX_T0(target_ulong t0)
{
    uint64_t r0, r1;

    mulu64(&r0, &r1, EAX, t0);
    EAX = r0;
    EDX = r1;
    CC_DST = r0;
    CC_SRC = r1;
}

void helper_imulq_EAX_T0(target_ulong t0)
{
    uint64_t r0, r1;

    muls64(&r0, &r1, EAX, t0);
    EAX = r0;
    EDX = r1;
    CC_DST = r0;
    CC_SRC = ((int64_t)r1 != ((int64_t)r0 >> 63));
}

target_ulong helper_imulq_T0_T1(target_ulong t0, target_ulong t1)
{
    uint64_t r0, r1;

    muls64(&r0, &r1, t0, t1);
    CC_DST = r0;
    CC_SRC = ((int64_t)r1 != ((int64_t)r0 >> 63));
    return r0;
}

void helper_divq_EAX(target_ulong t0)
{
    uint64_t r0, r1;
    if (t0 == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    r0 = EAX;
    r1 = EDX;
    if (div64(&r0, &r1, t0))
        raise_exception(EXCP00_DIVZ);
    EAX = r0;
    EDX = r1;
}

void helper_idivq_EAX(target_ulong t0)
{
    uint64_t r0, r1;
    if (t0 == 0) {
        raise_exception(EXCP00_DIVZ);
    }
    r0 = EAX;
    r1 = EDX;
    if (idiv64(&r0, &r1, t0))
        raise_exception(EXCP00_DIVZ);
    EAX = r0;
    EDX = r1;
}
#endif

static void do_hlt(void)
{
    env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
    env->halted = 1;
    env->exception_index = EXCP_HLT;
    cpu_loop_exit();
}

void helper_hlt(int next_eip_addend)
{
    helper_svm_check_intercept_param(SVM_EXIT_HLT, 0);
    EIP += next_eip_addend;
    
    do_hlt();
}

void helper_monitor(target_ulong ptr)
{
    if ((uint32_t)ECX != 0)
        raise_exception(EXCP0D_GPF);
    /* XXX: store address ? */
    helper_svm_check_intercept_param(SVM_EXIT_MONITOR, 0);
}

void helper_mwait(int next_eip_addend)
{
    if ((uint32_t)ECX != 0)
        raise_exception(EXCP0D_GPF);
    helper_svm_check_intercept_param(SVM_EXIT_MWAIT, 0);
    EIP += next_eip_addend;

    /* XXX: not complete but not completely erroneous */
    if (env->cpu_index != 0 || env->next_cpu != NULL) {
        /* more than one CPU: do not sleep because another CPU may
           wake this one */
    } else {
        do_hlt();
    }
}

void helper_debug(void)
{
    env->exception_index = EXCP_DEBUG;
    cpu_loop_exit();
}

void helper_raise_interrupt(int intno, int next_eip_addend)
{
    raise_interrupt(intno, 1, 0, next_eip_addend);
}

void helper_raise_exception(int exception_index)
{
    raise_exception(exception_index);
}

void helper_cli(void)
{
    env->eflags &= ~IF_MASK;
}

void helper_sti(void)
{
    env->eflags |= IF_MASK;
}

#if 0
/* vm86plus instructions */
void helper_cli_vm(void)
{
    env->eflags &= ~VIF_MASK;
}

void helper_sti_vm(void)
{
    env->eflags |= VIF_MASK;
    if (env->eflags & VIP_MASK) {
        raise_exception(EXCP0D_GPF);
    }
}
#endif

void helper_set_inhibit_irq(void)
{
    env->hflags |= HF_INHIBIT_IRQ_MASK;
}

void helper_reset_inhibit_irq(void)
{
    env->hflags &= ~HF_INHIBIT_IRQ_MASK;
}

void helper_boundw(target_ulong a0, int v)
{
    int low, high;
    low = ldsw(a0);
    high = ldsw(a0 + 2);
    v = (int16_t)v;
    if (v < low || v > high) {
        raise_exception(EXCP05_BOUND);
    }
}

void helper_boundl(target_ulong a0, int v)
{
    int low, high;
    low = ldl(a0);
    high = ldl(a0 + 4);
    if (v < low || v > high) {
        raise_exception(EXCP05_BOUND);
    }
}

static float approx_rsqrt(float a)
{
    return 1.0 / sqrt(a);
}

static float approx_rcp(float a)
{
    return 1.0 / a;
}

#if !defined(CONFIG_USER_ONLY)

#define MMUSUFFIX _mmu

#define SHIFT 0
#include "softmmu_template.h"

#define SHIFT 1
#include "softmmu_template.h"

#define SHIFT 2
#include "softmmu_template.h"

#define SHIFT 3
#include "softmmu_template.h"

#endif

#if !defined(CONFIG_USER_ONLY)
/* try to fill the TLB and return an exception if error. If retaddr is
   NULL, it means that the function was called in C code (i.e. not
   from generated code or from helper.c) */
/* XXX: fix it to restore all registers */
void tlb_fill(target_ulong addr, int is_write, int mmu_idx, void *retaddr)
{
    TranslationBlock *tb;
    int ret;
    unsigned long pc;
    CPUX86State *saved_env;

    /* XXX: hack to restore env in all cases, even if not called from
       generated code */
    saved_env = env;
    env = cpu_single_env;

    ret = cpu_x86_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
    if (ret) {
        if (retaddr) {
            /* now we have a real cpu fault */
            pc = (unsigned long)retaddr;
            tb = tb_find_pc(pc);
            if (tb) {
                /* the PC is inside the translated code. It means that we have
                   a virtual CPU fault */
                cpu_restore_state(tb, env, pc, NULL);
            }
        }
        raise_exception_err(env->exception_index, env->error_code);
    }
    env = saved_env;
}
#endif

/* Secure Virtual Machine helpers */

#if defined(CONFIG_USER_ONLY)

void helper_vmrun(int aflag, int next_eip_addend)
{ 
}
void helper_vmmcall(void) 
{ 
}
void helper_vmload(int aflag)
{ 
}
void helper_vmsave(int aflag)
{ 
}
void helper_stgi(void)
{
}
void helper_clgi(void)
{
}
void helper_skinit(void) 
{ 
}
void helper_invlpga(int aflag)
{ 
}
void helper_vmexit(uint32_t exit_code, uint64_t exit_info_1) 
{ 
}
void helper_svm_check_intercept_param(uint32_t type, uint64_t param)
{
}

void helper_svm_check_io(uint32_t port, uint32_t param, 
                         uint32_t next_eip_addend)
{
}
#else

static inline void svm_save_seg(target_phys_addr_t addr,
                                const SegmentCache *sc)
{
    stw_phys(addr + offsetof(struct vmcb_seg, selector), 
             sc->selector);
    stq_phys(addr + offsetof(struct vmcb_seg, base), 
             sc->base);
    stl_phys(addr + offsetof(struct vmcb_seg, limit), 
             sc->limit);
    stw_phys(addr + offsetof(struct vmcb_seg, attrib), 
             ((sc->flags >> 8) & 0xff) | ((sc->flags >> 12) & 0x0f00));
}
                                
static inline void svm_load_seg(target_phys_addr_t addr, SegmentCache *sc)
{
    unsigned int flags;

    sc->selector = lduw_phys(addr + offsetof(struct vmcb_seg, selector));
    sc->base = ldq_phys(addr + offsetof(struct vmcb_seg, base));
    sc->limit = ldl_phys(addr + offsetof(struct vmcb_seg, limit));
    flags = lduw_phys(addr + offsetof(struct vmcb_seg, attrib));
    sc->flags = ((flags & 0xff) << 8) | ((flags & 0x0f00) << 12);
}

static inline void svm_load_seg_cache(target_phys_addr_t addr, 
                                      CPUState *env, int seg_reg)
{
    SegmentCache sc1, *sc = &sc1;
    svm_load_seg(addr, sc);
    cpu_x86_load_seg_cache(env, seg_reg, sc->selector,
                           sc->base, sc->limit, sc->flags);
}

void helper_vmrun(int aflag, int next_eip_addend)
{
    target_ulong addr;
    uint32_t event_inj;
    uint32_t int_ctl;

    helper_svm_check_intercept_param(SVM_EXIT_VMRUN, 0);

    if (aflag == 2)
        addr = EAX;
    else
        addr = (uint32_t)EAX;

    qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmrun! " TARGET_FMT_lx "\n", addr);

    env->vm_vmcb = addr;

    /* save the current CPU state in the hsave page */
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.gdtr.base), env->gdt.base);
    stl_phys(env->vm_hsave + offsetof(struct vmcb, save.gdtr.limit), env->gdt.limit);

    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.idtr.base), env->idt.base);
    stl_phys(env->vm_hsave + offsetof(struct vmcb, save.idtr.limit), env->idt.limit);

    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr0), env->cr[0]);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr2), env->cr[2]);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr3), env->cr[3]);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr4), env->cr[4]);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.dr6), env->dr[6]);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.dr7), env->dr[7]);

    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.efer), env->efer);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.rflags), compute_eflags());

    svm_save_seg(env->vm_hsave + offsetof(struct vmcb, save.es), 
                  &env->segs[R_ES]);
    svm_save_seg(env->vm_hsave + offsetof(struct vmcb, save.cs), 
                 &env->segs[R_CS]);
    svm_save_seg(env->vm_hsave + offsetof(struct vmcb, save.ss), 
                 &env->segs[R_SS]);
    svm_save_seg(env->vm_hsave + offsetof(struct vmcb, save.ds), 
                 &env->segs[R_DS]);

    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.rip),
             EIP + next_eip_addend);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.rsp), ESP);
    stq_phys(env->vm_hsave + offsetof(struct vmcb, save.rax), EAX);

    /* load the interception bitmaps so we do not need to access the
       vmcb in svm mode */
    env->intercept            = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept));
    env->intercept_cr_read    = lduw_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept_cr_read));
    env->intercept_cr_write   = lduw_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept_cr_write));
    env->intercept_dr_read    = lduw_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept_dr_read));
    env->intercept_dr_write   = lduw_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept_dr_write));
    env->intercept_exceptions = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.intercept_exceptions));

    /* enable intercepts */
    env->hflags |= HF_SVMI_MASK;

    env->tsc_offset = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, control.tsc_offset));

    env->gdt.base  = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.gdtr.base));
    env->gdt.limit = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, save.gdtr.limit));

    env->idt.base  = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.idtr.base));
    env->idt.limit = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, save.idtr.limit));

    /* clear exit_info_2 so we behave like the real hardware */
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2), 0);

    cpu_x86_update_cr0(env, ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr0)));
    cpu_x86_update_cr4(env, ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr4)));
    cpu_x86_update_cr3(env, ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr3)));
    env->cr[2] = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr2));
    int_ctl = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_ctl));
    env->hflags2 &= ~(HF2_HIF_MASK | HF2_VINTR_MASK);
    if (int_ctl & V_INTR_MASKING_MASK) {
        env->v_tpr = int_ctl & V_TPR_MASK;
        env->hflags2 |= HF2_VINTR_MASK;
        if (env->eflags & IF_MASK)
            env->hflags2 |= HF2_HIF_MASK;
    }

    cpu_load_efer(env, 
                  ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.efer)));
    env->eflags = 0;
    load_eflags(ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rflags)),
                ~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
    CC_OP = CC_OP_EFLAGS;

    svm_load_seg_cache(env->vm_vmcb + offsetof(struct vmcb, save.es),
                       env, R_ES);
    svm_load_seg_cache(env->vm_vmcb + offsetof(struct vmcb, save.cs),
                       env, R_CS);
    svm_load_seg_cache(env->vm_vmcb + offsetof(struct vmcb, save.ss),
                       env, R_SS);
    svm_load_seg_cache(env->vm_vmcb + offsetof(struct vmcb, save.ds),
                       env, R_DS);

    EIP = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rip));
    env->eip = EIP;
    ESP = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rsp));
    EAX = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rax));
    env->dr[7] = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.dr7));
    env->dr[6] = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, save.dr6));
    cpu_x86_set_cpl(env, ldub_phys(env->vm_vmcb + offsetof(struct vmcb, save.cpl)));

    /* FIXME: guest state consistency checks */

    switch(ldub_phys(env->vm_vmcb + offsetof(struct vmcb, control.tlb_ctl))) {
        case TLB_CONTROL_DO_NOTHING:
            break;
        case TLB_CONTROL_FLUSH_ALL_ASID:
            /* FIXME: this is not 100% correct but should work for now */
            tlb_flush(env, 1);
        break;
    }

    env->hflags2 |= HF2_GIF_MASK;

    if (int_ctl & V_IRQ_MASK) {
        env->interrupt_request |= CPU_INTERRUPT_VIRQ;
    }

    /* maybe we need to inject an event */
    event_inj = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj));
    if (event_inj & SVM_EVTINJ_VALID) {
        uint8_t vector = event_inj & SVM_EVTINJ_VEC_MASK;
        uint16_t valid_err = event_inj & SVM_EVTINJ_VALID_ERR;
        uint32_t event_inj_err = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj_err));
        stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj), event_inj & ~SVM_EVTINJ_VALID);

        qemu_log_mask(CPU_LOG_TB_IN_ASM, "Injecting(%#hx): ", valid_err);
        /* FIXME: need to implement valid_err */
        switch (event_inj & SVM_EVTINJ_TYPE_MASK) {
        case SVM_EVTINJ_TYPE_INTR:
                env->exception_index = vector;
                env->error_code = event_inj_err;
                env->exception_is_int = 0;
                env->exception_next_eip = -1;
                qemu_log_mask(CPU_LOG_TB_IN_ASM, "INTR");
                /* XXX: is it always correct ? */
                do_interrupt(vector, 0, 0, 0, 1);
                break;
        case SVM_EVTINJ_TYPE_NMI:
                env->exception_index = EXCP02_NMI;
                env->error_code = event_inj_err;
                env->exception_is_int = 0;
                env->exception_next_eip = EIP;
                qemu_log_mask(CPU_LOG_TB_IN_ASM, "NMI");
                cpu_loop_exit();
                break;
        case SVM_EVTINJ_TYPE_EXEPT:
                env->exception_index = vector;
                env->error_code = event_inj_err;
                env->exception_is_int = 0;
                env->exception_next_eip = -1;
                qemu_log_mask(CPU_LOG_TB_IN_ASM, "EXEPT");
                cpu_loop_exit();
                break;
        case SVM_EVTINJ_TYPE_SOFT:
                env->exception_index = vector;
                env->error_code = event_inj_err;
                env->exception_is_int = 1;
                env->exception_next_eip = EIP;
                qemu_log_mask(CPU_LOG_TB_IN_ASM, "SOFT");
                cpu_loop_exit();
                break;
        }
        qemu_log_mask(CPU_LOG_TB_IN_ASM, " %#x %#x\n", env->exception_index, env->error_code);
    }
}

void helper_vmmcall(void)
{
    helper_svm_check_intercept_param(SVM_EXIT_VMMCALL, 0);
    raise_exception(EXCP06_ILLOP);
}

void helper_vmload(int aflag)
{
    target_ulong addr;
    helper_svm_check_intercept_param(SVM_EXIT_VMLOAD, 0);

    if (aflag == 2)
        addr = EAX;
    else
        addr = (uint32_t)EAX;

    qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmload! " TARGET_FMT_lx "\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n",
                addr, ldq_phys(addr + offsetof(struct vmcb, save.fs.base)),
                env->segs[R_FS].base);

    svm_load_seg_cache(addr + offsetof(struct vmcb, save.fs),
                       env, R_FS);
    svm_load_seg_cache(addr + offsetof(struct vmcb, save.gs),
                       env, R_GS);
    svm_load_seg(addr + offsetof(struct vmcb, save.tr),
                 &env->tr);
    svm_load_seg(addr + offsetof(struct vmcb, save.ldtr),
                 &env->ldt);

#ifdef TARGET_X86_64
    env->kernelgsbase = ldq_phys(addr + offsetof(struct vmcb, save.kernel_gs_base));
    env->lstar = ldq_phys(addr + offsetof(struct vmcb, save.lstar));
    env->cstar = ldq_phys(addr + offsetof(struct vmcb, save.cstar));
    env->fmask = ldq_phys(addr + offsetof(struct vmcb, save.sfmask));
#endif
    env->star = ldq_phys(addr + offsetof(struct vmcb, save.star));
    env->sysenter_cs = ldq_phys(addr + offsetof(struct vmcb, save.sysenter_cs));
    env->sysenter_esp = ldq_phys(addr + offsetof(struct vmcb, save.sysenter_esp));
    env->sysenter_eip = ldq_phys(addr + offsetof(struct vmcb, save.sysenter_eip));
}

void helper_vmsave(int aflag)
{
    target_ulong addr;
    helper_svm_check_intercept_param(SVM_EXIT_VMSAVE, 0);

    if (aflag == 2)
        addr = EAX;
    else
        addr = (uint32_t)EAX;

    qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmsave! " TARGET_FMT_lx "\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n",
                addr, ldq_phys(addr + offsetof(struct vmcb, save.fs.base)),
                env->segs[R_FS].base);

    svm_save_seg(addr + offsetof(struct vmcb, save.fs), 
                 &env->segs[R_FS]);
    svm_save_seg(addr + offsetof(struct vmcb, save.gs), 
                 &env->segs[R_GS]);
    svm_save_seg(addr + offsetof(struct vmcb, save.tr), 
                 &env->tr);
    svm_save_seg(addr + offsetof(struct vmcb, save.ldtr), 
                 &env->ldt);

#ifdef TARGET_X86_64
    stq_phys(addr + offsetof(struct vmcb, save.kernel_gs_base), env->kernelgsbase);
    stq_phys(addr + offsetof(struct vmcb, save.lstar), env->lstar);
    stq_phys(addr + offsetof(struct vmcb, save.cstar), env->cstar);
    stq_phys(addr + offsetof(struct vmcb, save.sfmask), env->fmask);
#endif
    stq_phys(addr + offsetof(struct vmcb, save.star), env->star);
    stq_phys(addr + offsetof(struct vmcb, save.sysenter_cs), env->sysenter_cs);
    stq_phys(addr + offsetof(struct vmcb, save.sysenter_esp), env->sysenter_esp);
    stq_phys(addr + offsetof(struct vmcb, save.sysenter_eip), env->sysenter_eip);
}

void helper_stgi(void)
{
    helper_svm_check_intercept_param(SVM_EXIT_STGI, 0);
    env->hflags2 |= HF2_GIF_MASK;
}

void helper_clgi(void)
{
    helper_svm_check_intercept_param(SVM_EXIT_CLGI, 0);
    env->hflags2 &= ~HF2_GIF_MASK;
}

void helper_skinit(void)
{
    helper_svm_check_intercept_param(SVM_EXIT_SKINIT, 0);
    /* XXX: not implemented */
    raise_exception(EXCP06_ILLOP);
}

void helper_invlpga(int aflag)
{
    target_ulong addr;
    helper_svm_check_intercept_param(SVM_EXIT_INVLPGA, 0);
    
    if (aflag == 2)
        addr = EAX;
    else
        addr = (uint32_t)EAX;

    /* XXX: could use the ASID to see if it is needed to do the
       flush */
    tlb_flush_page(env, addr);
}

void helper_svm_check_intercept_param(uint32_t type, uint64_t param)
{
    if (likely(!(env->hflags & HF_SVMI_MASK)))
        return;
    switch(type) {
    case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR0 + 8:
        if (env->intercept_cr_read & (1 << (type - SVM_EXIT_READ_CR0))) {
            helper_vmexit(type, param);
        }
        break;
    case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR0 + 8:
        if (env->intercept_cr_write & (1 << (type - SVM_EXIT_WRITE_CR0))) {
            helper_vmexit(type, param);
        }
        break;
    case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR0 + 7:
        if (env->intercept_dr_read & (1 << (type - SVM_EXIT_READ_DR0))) {
            helper_vmexit(type, param);
        }
        break;
    case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR0 + 7:
        if (env->intercept_dr_write & (1 << (type - SVM_EXIT_WRITE_DR0))) {
            helper_vmexit(type, param);
        }
        break;
    case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 31:
        if (env->intercept_exceptions & (1 << (type - SVM_EXIT_EXCP_BASE))) {
            helper_vmexit(type, param);
        }
        break;
    case SVM_EXIT_MSR:
        if (env->intercept & (1ULL << (SVM_EXIT_MSR - SVM_EXIT_INTR))) {
            /* FIXME: this should be read in at vmrun (faster this way?) */
            uint64_t addr = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, control.msrpm_base_pa));
            uint32_t t0, t1;
            switch((uint32_t)ECX) {
            case 0 ... 0x1fff:
                t0 = (ECX * 2) % 8;
                t1 = ECX / 8;
                break;
            case 0xc0000000 ... 0xc0001fff:
                t0 = (8192 + ECX - 0xc0000000) * 2;
                t1 = (t0 / 8);
                t0 %= 8;
                break;
            case 0xc0010000 ... 0xc0011fff:
                t0 = (16384 + ECX - 0xc0010000) * 2;
                t1 = (t0 / 8);
                t0 %= 8;
                break;
            default:
                helper_vmexit(type, param);
                t0 = 0;
                t1 = 0;
                break;
            }
            if (ldub_phys(addr + t1) & ((1 << param) << t0))
                helper_vmexit(type, param);
        }
        break;
    default:
        if (env->intercept & (1ULL << (type - SVM_EXIT_INTR))) {
            helper_vmexit(type, param);
        }
        break;
    }
}

void helper_svm_check_io(uint32_t port, uint32_t param, 
                         uint32_t next_eip_addend)
{
    if (env->intercept & (1ULL << (SVM_EXIT_IOIO - SVM_EXIT_INTR))) {
        /* FIXME: this should be read in at vmrun (faster this way?) */
        uint64_t addr = ldq_phys(env->vm_vmcb + offsetof(struct vmcb, control.iopm_base_pa));
        uint16_t mask = (1 << ((param >> 4) & 7)) - 1;
        if(lduw_phys(addr + port / 8) & (mask << (port & 7))) {
            /* next EIP */
            stq_phys(env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2), 
                     env->eip + next_eip_addend);
            helper_vmexit(SVM_EXIT_IOIO, param | (port << 16));
        }
    }
}

/* Note: currently only 32 bits of exit_code are used */
void helper_vmexit(uint32_t exit_code, uint64_t exit_info_1)
{
    uint32_t int_ctl;

    qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmexit(%08x, %016" PRIx64 ", %016" PRIx64 ", " TARGET_FMT_lx ")!\n",
                exit_code, exit_info_1,
                ldq_phys(env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2)),
                EIP);

    if(env->hflags & HF_INHIBIT_IRQ_MASK) {
        stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_state), SVM_INTERRUPT_SHADOW_MASK);
        env->hflags &= ~HF_INHIBIT_IRQ_MASK;
    } else {
        stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_state), 0);
    }

    /* Save the VM state in the vmcb */
    svm_save_seg(env->vm_vmcb + offsetof(struct vmcb, save.es), 
                 &env->segs[R_ES]);
    svm_save_seg(env->vm_vmcb + offsetof(struct vmcb, save.cs), 
                 &env->segs[R_CS]);
    svm_save_seg(env->vm_vmcb + offsetof(struct vmcb, save.ss), 
                 &env->segs[R_SS]);
    svm_save_seg(env->vm_vmcb + offsetof(struct vmcb, save.ds), 
                 &env->segs[R_DS]);

    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.gdtr.base), env->gdt.base);
    stl_phys(env->vm_vmcb + offsetof(struct vmcb, save.gdtr.limit), env->gdt.limit);

    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.idtr.base), env->idt.base);
    stl_phys(env->vm_vmcb + offsetof(struct vmcb, save.idtr.limit), env->idt.limit);

    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.efer), env->efer);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr0), env->cr[0]);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr2), env->cr[2]);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr3), env->cr[3]);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.cr4), env->cr[4]);

    int_ctl = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_ctl));
    int_ctl &= ~(V_TPR_MASK | V_IRQ_MASK);
    int_ctl |= env->v_tpr & V_TPR_MASK;
    if (env->interrupt_request & CPU_INTERRUPT_VIRQ)
        int_ctl |= V_IRQ_MASK;
    stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_ctl), int_ctl);

    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rflags), compute_eflags());
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rip), env->eip);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rsp), ESP);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.rax), EAX);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.dr7), env->dr[7]);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, save.dr6), env->dr[6]);
    stb_phys(env->vm_vmcb + offsetof(struct vmcb, save.cpl), env->hflags & HF_CPL_MASK);

    /* Reload the host state from vm_hsave */
    env->hflags2 &= ~(HF2_HIF_MASK | HF2_VINTR_MASK);
    env->hflags &= ~HF_SVMI_MASK;
    env->intercept = 0;
    env->intercept_exceptions = 0;
    env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
    env->tsc_offset = 0;

    env->gdt.base  = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.gdtr.base));
    env->gdt.limit = ldl_phys(env->vm_hsave + offsetof(struct vmcb, save.gdtr.limit));

    env->idt.base  = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.idtr.base));
    env->idt.limit = ldl_phys(env->vm_hsave + offsetof(struct vmcb, save.idtr.limit));

    cpu_x86_update_cr0(env, ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr0)) | CR0_PE_MASK);
    cpu_x86_update_cr4(env, ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr4)));
    cpu_x86_update_cr3(env, ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.cr3)));
    /* we need to set the efer after the crs so the hidden flags get
       set properly */
    cpu_load_efer(env, 
                  ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.efer)));
    env->eflags = 0;
    load_eflags(ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.rflags)),
                ~(CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C | DF_MASK));
    CC_OP = CC_OP_EFLAGS;

    svm_load_seg_cache(env->vm_hsave + offsetof(struct vmcb, save.es),
                       env, R_ES);
    svm_load_seg_cache(env->vm_hsave + offsetof(struct vmcb, save.cs),
                       env, R_CS);
    svm_load_seg_cache(env->vm_hsave + offsetof(struct vmcb, save.ss),
                       env, R_SS);
    svm_load_seg_cache(env->vm_hsave + offsetof(struct vmcb, save.ds),
                       env, R_DS);

    EIP = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.rip));
    ESP = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.rsp));
    EAX = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.rax));

    env->dr[6] = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.dr6));
    env->dr[7] = ldq_phys(env->vm_hsave + offsetof(struct vmcb, save.dr7));

    /* other setups */
    cpu_x86_set_cpl(env, 0);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, control.exit_code), exit_code);
    stq_phys(env->vm_vmcb + offsetof(struct vmcb, control.exit_info_1), exit_info_1);

    env->hflags2 &= ~HF2_GIF_MASK;
    /* FIXME: Resets the current ASID register to zero (host ASID). */

    /* Clears the V_IRQ and V_INTR_MASKING bits inside the processor. */

    /* Clears the TSC_OFFSET inside the processor. */

    /* If the host is in PAE mode, the processor reloads the host's PDPEs
       from the page table indicated the host's CR3. If the PDPEs contain
       illegal state, the processor causes a shutdown. */

    /* Forces CR0.PE = 1, RFLAGS.VM = 0. */
    env->cr[0] |= CR0_PE_MASK;
    env->eflags &= ~VM_MASK;

    /* Disables all breakpoints in the host DR7 register. */

    /* Checks the reloaded host state for consistency. */

    /* If the host's rIP reloaded by #VMEXIT is outside the limit of the
       host's code segment or non-canonical (in the case of long mode), a
       #GP fault is delivered inside the host.) */

    /* remove any pending exception */
    env->exception_index = -1;
    env->error_code = 0;
    env->old_exception = -1;

    cpu_loop_exit();
}

#endif

/* MMX/SSE */
/* XXX: optimize by storing fptt and fptags in the static cpu state */
void helper_enter_mmx(void)
{
    env->fpstt = 0;
    *(uint32_t *)(env->fptags) = 0;
    *(uint32_t *)(env->fptags + 4) = 0;
}

void helper_emms(void)
{
    /* set to empty state */
    *(uint32_t *)(env->fptags) = 0x01010101;
    *(uint32_t *)(env->fptags + 4) = 0x01010101;
}

/* XXX: suppress */
void helper_movq(void *d, void *s)
{
    *(uint64_t *)d = *(uint64_t *)s;
}

#define SHIFT 0
#include "ops_sse.h"

#define SHIFT 1
#include "ops_sse.h"

#define SHIFT 0
#include "helper_template.h"
#undef SHIFT

#define SHIFT 1
#include "helper_template.h"
#undef SHIFT

#define SHIFT 2
#include "helper_template.h"
#undef SHIFT

#ifdef TARGET_X86_64

#define SHIFT 3
#include "helper_template.h"
#undef SHIFT

#endif

/* bit operations */
target_ulong helper_bsf(target_ulong t0)
{
    int count;
    target_ulong res;

    res = t0;
    count = 0;
    while ((res & 1) == 0) {
        count++;
        res >>= 1;
    }
    return count;
}

target_ulong helper_bsr(target_ulong t0)
{
    int count;
    target_ulong res, mask;
    
    res = t0;
    count = TARGET_LONG_BITS - 1;
    mask = (target_ulong)1 << (TARGET_LONG_BITS - 1);
    while ((res & mask) == 0) {
        count--;
        res <<= 1;
    }
    return count;
}


static int compute_all_eflags(void)
{
    return CC_SRC;
}

static int compute_c_eflags(void)
{
    return CC_SRC & CC_C;
}

uint32_t helper_cc_compute_all(int op)
{
    switch (op) {
    default: /* should never happen */ return 0;

    case CC_OP_EFLAGS: return compute_all_eflags();

    case CC_OP_MULB: return compute_all_mulb();
    case CC_OP_MULW: return compute_all_mulw();
    case CC_OP_MULL: return compute_all_mull();

    case CC_OP_ADDB: return compute_all_addb();
    case CC_OP_ADDW: return compute_all_addw();
    case CC_OP_ADDL: return compute_all_addl();

    case CC_OP_ADCB: return compute_all_adcb();
    case CC_OP_ADCW: return compute_all_adcw();
    case CC_OP_ADCL: return compute_all_adcl();

    case CC_OP_SUBB: return compute_all_subb();
    case CC_OP_SUBW: return compute_all_subw();
    case CC_OP_SUBL: return compute_all_subl();

    case CC_OP_SBBB: return compute_all_sbbb();
    case CC_OP_SBBW: return compute_all_sbbw();
    case CC_OP_SBBL: return compute_all_sbbl();

    case CC_OP_LOGICB: return compute_all_logicb();
    case CC_OP_LOGICW: return compute_all_logicw();
    case CC_OP_LOGICL: return compute_all_logicl();

    case CC_OP_INCB: return compute_all_incb();
    case CC_OP_INCW: return compute_all_incw();
    case CC_OP_INCL: return compute_all_incl();

    case CC_OP_DECB: return compute_all_decb();
    case CC_OP_DECW: return compute_all_decw();
    case CC_OP_DECL: return compute_all_decl();

    case CC_OP_SHLB: return compute_all_shlb();
    case CC_OP_SHLW: return compute_all_shlw();
    case CC_OP_SHLL: return compute_all_shll();

    case CC_OP_SARB: return compute_all_sarb();
    case CC_OP_SARW: return compute_all_sarw();
    case CC_OP_SARL: return compute_all_sarl();

#ifdef TARGET_X86_64
    case CC_OP_MULQ: return compute_all_mulq();

    case CC_OP_ADDQ: return compute_all_addq();

    case CC_OP_ADCQ: return compute_all_adcq();

    case CC_OP_SUBQ: return compute_all_subq();

    case CC_OP_SBBQ: return compute_all_sbbq();

    case CC_OP_LOGICQ: return compute_all_logicq();

    case CC_OP_INCQ: return compute_all_incq();

    case CC_OP_DECQ: return compute_all_decq();

    case CC_OP_SHLQ: return compute_all_shlq();

    case CC_OP_SARQ: return compute_all_sarq();
#endif
    }
}

uint32_t helper_cc_compute_c(int op)
{
    switch (op) {
    default: /* should never happen */ return 0;

    case CC_OP_EFLAGS: return compute_c_eflags();

    case CC_OP_MULB: return compute_c_mull();
    case CC_OP_MULW: return compute_c_mull();
    case CC_OP_MULL: return compute_c_mull();

    case CC_OP_ADDB: return compute_c_addb();
    case CC_OP_ADDW: return compute_c_addw();
    case CC_OP_ADDL: return compute_c_addl();

    case CC_OP_ADCB: return compute_c_adcb();
    case CC_OP_ADCW: return compute_c_adcw();
    case CC_OP_ADCL: return compute_c_adcl();

    case CC_OP_SUBB: return compute_c_subb();
    case CC_OP_SUBW: return compute_c_subw();
    case CC_OP_SUBL: return compute_c_subl();

    case CC_OP_SBBB: return compute_c_sbbb();
    case CC_OP_SBBW: return compute_c_sbbw();
    case CC_OP_SBBL: return compute_c_sbbl();

    case CC_OP_LOGICB: return compute_c_logicb();
    case CC_OP_LOGICW: return compute_c_logicw();
    case CC_OP_LOGICL: return compute_c_logicl();

    case CC_OP_INCB: return compute_c_incl();
    case CC_OP_INCW: return compute_c_incl();
    case CC_OP_INCL: return compute_c_incl();

    case CC_OP_DECB: return compute_c_incl();
    case CC_OP_DECW: return compute_c_incl();
    case CC_OP_DECL: return compute_c_incl();

    case CC_OP_SHLB: return compute_c_shlb();
    case CC_OP_SHLW: return compute_c_shlw();
    case CC_OP_SHLL: return compute_c_shll();

    case CC_OP_SARB: return compute_c_sarl();
    case CC_OP_SARW: return compute_c_sarl();
    case CC_OP_SARL: return compute_c_sarl();

#ifdef TARGET_X86_64
    case CC_OP_MULQ: return compute_c_mull();

    case CC_OP_ADDQ: return compute_c_addq();

    case CC_OP_ADCQ: return compute_c_adcq();

    case CC_OP_SUBQ: return compute_c_subq();

    case CC_OP_SBBQ: return compute_c_sbbq();

    case CC_OP_LOGICQ: return compute_c_logicq();

    case CC_OP_INCQ: return compute_c_incl();

    case CC_OP_DECQ: return compute_c_incl();

    case CC_OP_SHLQ: return compute_c_shlq();

    case CC_OP_SARQ: return compute_c_sarl();
#endif
    }
}