Archipelago » qemu

/*

 *  i386 execution defines

 *

 *  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, see <http://www.gnu.org/licenses/>.

 */

#include "config.h"

#include "dyngen-exec.h"

/* XXX: factorize this mess */

#ifdef TARGET_X86_64

#define TARGET_LONG_BITS 64

#else

#define TARGET_LONG_BITS 32

#endif

#include "cpu-defs.h"

register struct CPUX86State *env asm(AREG0);

#include "qemu-common.h"

#include "qemu-log.h"

#undef EAX

#define EAX (env->regs[R_EAX])

#undef ECX

#define ECX (env->regs[R_ECX])

#undef EDX

#define EDX (env->regs[R_EDX])

#undef EBX

#define EBX (env->regs[R_EBX])

#undef ESP

#define ESP (env->regs[R_ESP])

#undef EBP

#define EBP (env->regs[R_EBP])

#undef ESI

#define ESI (env->regs[R_ESI])

#undef EDI

#define EDI (env->regs[R_EDI])

#undef EIP

#define EIP (env->eip)

#define DF  (env->df)

#define CC_SRC (env->cc_src)

#define CC_DST (env->cc_dst)

#define CC_OP  (env->cc_op)

/* float macros */

#define FT0    (env->ft0)

#define ST0    (env->fpregs[env->fpstt].d)

#define ST(n)  (env->fpregs[(env->fpstt + (n)) & 7].d)

#define ST1    ST(1)

#include "cpu.h"

#include "exec-all.h"

/* op_helper.c */

void do_interrupt(int intno, int is_int, int error_code,

                  target_ulong next_eip, int is_hw);

void do_interrupt_user(int intno, int is_int, int error_code,

                       target_ulong next_eip);

void QEMU_NORETURN raise_exception_err(int exception_index, int error_code);

void QEMU_NORETURN raise_exception(int exception_index);

void do_smm_enter(void);

/* n must be a constant to be efficient */

static inline target_long lshift(target_long x, int n)

{

    if (n >= 0)

        return x << n;

    else

        return x >> (-n);

}

#include "helper.h"

static inline void svm_check_intercept(uint32_t type)

{

    helper_svm_check_intercept_param(type, 0);

}

#if !defined(CONFIG_USER_ONLY)

#include "softmmu_exec.h"

#endif /* !defined(CONFIG_USER_ONLY) */

#ifdef USE_X86LDOUBLE

/* use long double functions */

#define floatx_to_int32 floatx80_to_int32

#define floatx_to_int64 floatx80_to_int64

#define floatx_to_int32_round_to_zero floatx80_to_int32_round_to_zero

#define floatx_to_int64_round_to_zero floatx80_to_int64_round_to_zero

#define int32_to_floatx int32_to_floatx80

#define int64_to_floatx int64_to_floatx80

#define float32_to_floatx float32_to_floatx80

#define float64_to_floatx float64_to_floatx80

#define floatx_to_float32 floatx80_to_float32

#define floatx_to_float64 floatx80_to_float64

#define floatx_abs floatx80_abs

#define floatx_chs floatx80_chs

#define floatx_round_to_int floatx80_round_to_int

#define floatx_compare floatx80_compare

#define floatx_compare_quiet floatx80_compare_quiet

#else

#define floatx_to_int32 float64_to_int32

#define floatx_to_int64 float64_to_int64

#define floatx_to_int32_round_to_zero float64_to_int32_round_to_zero

#define floatx_to_int64_round_to_zero float64_to_int64_round_to_zero

#define int32_to_floatx int32_to_float64

#define int64_to_floatx int64_to_float64

#define float32_to_floatx float32_to_float64

#define float64_to_floatx(x, e) (x)

#define floatx_to_float32 float64_to_float32

#define floatx_to_float64(x, e) (x)

#define floatx_abs float64_abs

#define floatx_chs float64_chs

#define floatx_round_to_int float64_round_to_int

#define floatx_compare float64_compare

#define floatx_compare_quiet float64_compare_quiet

#endif

#define RC_MASK         0xc00

#define RC_NEAR                0x000

#define RC_DOWN                0x400

#define RC_UP                0x800

#define RC_CHOP                0xc00

#define MAXTAN 9223372036854775808.0

#ifdef USE_X86LDOUBLE

/* only for x86 */

typedef union {

    long double d;

    struct {

        unsigned long long lower;

        unsigned short upper;

    } l;

} CPU86_LDoubleU;

/* the following deal with x86 long double-precision numbers */

#define MAXEXPD 0x7fff

#define EXPBIAS 16383

#define EXPD(fp)        (fp.l.upper & 0x7fff)

#define SIGND(fp)        ((fp.l.upper) & 0x8000)

#define MANTD(fp)       (fp.l.lower)

#define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7fff)) | EXPBIAS

#else

/* NOTE: arm is horrible as double 32 bit words are stored in big endian ! */

typedef union {

    double d;

#if !defined(HOST_WORDS_BIGENDIAN) && !defined(__arm__)

    struct {

        uint32_t lower;

        int32_t upper;

    } l;

#else

    struct {

        int32_t upper;

        uint32_t lower;

    } l;

#endif

#ifndef __arm__

    int64_t ll;

#endif

} CPU86_LDoubleU;

/* the following deal with IEEE double-precision numbers */

#define MAXEXPD 0x7ff

#define EXPBIAS 1023

#define EXPD(fp)        (((fp.l.upper) >> 20) & 0x7FF)

#define SIGND(fp)        ((fp.l.upper) & 0x80000000)

#ifdef __arm__

#define MANTD(fp)        (fp.l.lower | ((uint64_t)(fp.l.upper & ((1 << 20) - 1)) << 32))

#else

#define MANTD(fp)        (fp.ll & ((1LL << 52) - 1))

#endif

#define BIASEXPONENT(fp) fp.l.upper = (fp.l.upper & ~(0x7ff << 20)) | (EXPBIAS << 20)

#endif

static inline void fpush(void)

{

    env->fpstt = (env->fpstt - 1) & 7;

    env->fptags[env->fpstt] = 0; /* validate stack entry */

}

static inline void fpop(void)

{

    env->fptags[env->fpstt] = 1; /* invvalidate stack entry */

    env->fpstt = (env->fpstt + 1) & 7;

}

#ifndef USE_X86LDOUBLE

static inline CPU86_LDouble helper_fldt(target_ulong ptr)

{

    CPU86_LDoubleU temp;

    int upper, e;

    uint64_t ll;

    /* mantissa */

    upper = lduw(ptr + 8);

    /* XXX: handle overflow ? */

    e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */

    e |= (upper >> 4) & 0x800; /* sign */

    ll = (ldq(ptr) >> 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;

}

static inline void helper_fstt(CPU86_LDouble f, target_ulong ptr)

{

    CPU86_LDoubleU temp;

    int e;

    temp.d = f;

    /* mantissa */

    stq(ptr, (MANTD(temp) << 11) | (1LL << 63));

    /* exponent + sign */

    e = EXPD(temp) - EXPBIAS + 16383;

    e |= SIGND(temp) >> 16;

    stw(ptr + 8, e);

}

#else

/* we use memory access macros */

static inline CPU86_LDouble helper_fldt(target_ulong ptr)

{

    CPU86_LDoubleU temp;

    temp.l.lower = ldq(ptr);

    temp.l.upper = lduw(ptr + 8);

    return temp.d;

}

static inline void helper_fstt(CPU86_LDouble f, target_ulong ptr)

{

    CPU86_LDoubleU temp;

    temp.d = f;

    stq(ptr, temp.l.lower);

    stw(ptr + 8, temp.l.upper);

}

#endif /* USE_X86LDOUBLE */

#define FPUS_IE (1 << 0)

#define FPUS_DE (1 << 1)

#define FPUS_ZE (1 << 2)

#define FPUS_OE (1 << 3)

#define FPUS_UE (1 << 4)

#define FPUS_PE (1 << 5)

#define FPUS_SF (1 << 6)

#define FPUS_SE (1 << 7)

#define FPUS_B  (1 << 15)

#define FPUC_EM 0x3f

static inline uint32_t compute_eflags(void)

{

    return env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);

}

/* NOTE: CC_OP must be modified manually to CC_OP_EFLAGS */

static inline void load_eflags(int eflags, int update_mask)

{

    CC_SRC = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);

    DF = 1 - (2 * ((eflags >> 10) & 1));

    env->eflags = (env->eflags & ~update_mask) |

        (eflags & update_mask) | 0x2;

}

static inline int cpu_has_work(CPUState *env)

{

    int work;

    work = (env->interrupt_request & CPU_INTERRUPT_HARD) &&

           (env->eflags & IF_MASK);

    work |= env->interrupt_request & CPU_INTERRUPT_NMI;

    work |= env->interrupt_request & CPU_INTERRUPT_INIT;

    work |= env->interrupt_request & CPU_INTERRUPT_SIPI;

    return work;

}

static inline int cpu_halted(CPUState *env) {

    /* handle exit of HALTED state */

    if (!env->halted)

        return 0;

    /* disable halt condition */

    if (cpu_has_work(env)) {

        env->halted = 0;

        return 0;

    }

    return EXCP_HALTED;

}

/* load efer and update the corresponding hflags. XXX: do consistency

   checks with cpuid bits ? */

static inline void cpu_load_efer(CPUState *env, uint64_t val)

{

    env->efer = val;

    env->hflags &= ~(HF_LMA_MASK | HF_SVME_MASK);

    if (env->efer & MSR_EFER_LMA)

        env->hflags |= HF_LMA_MASK;

    if (env->efer & MSR_EFER_SVME)

        env->hflags |= HF_SVME_MASK;

}