Archipelago » qemu

/*

 *  i386 micro operations (included several times to generate

 *  different operand sizes)

 *

 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#define DATA_BITS (1 << (3 + SHIFT))

#define SHIFT_MASK (DATA_BITS - 1)

#define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1))

#if DATA_BITS <= 32

#define SHIFT1_MASK 0x1f

#else

#define SHIFT1_MASK 0x3f

#endif

#if DATA_BITS == 8

#define SUFFIX b

#define DATA_TYPE uint8_t

#define DATA_STYPE int8_t

#define DATA_MASK 0xff

#elif DATA_BITS == 16

#define SUFFIX w

#define DATA_TYPE uint16_t

#define DATA_STYPE int16_t

#define DATA_MASK 0xffff

#elif DATA_BITS == 32

#define SUFFIX l

#define DATA_TYPE uint32_t

#define DATA_STYPE int32_t

#define DATA_MASK 0xffffffff

#elif DATA_BITS == 64

#define SUFFIX q

#define DATA_TYPE uint64_t

#define DATA_STYPE int64_t

#define DATA_MASK 0xffffffffffffffffULL

#else

#error unhandled operand size

#endif

/* various optimized jumps cases */

void OPPROTO glue(op_jb_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    if ((DATA_TYPE)src1 < (DATA_TYPE)src2)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jz_sub, SUFFIX)(void)

{

    if ((DATA_TYPE)CC_DST == 0)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jnz_sub, SUFFIX)(void)

{

    if ((DATA_TYPE)CC_DST != 0)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jbe_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    if ((DATA_TYPE)src1 <= (DATA_TYPE)src2)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_js_sub, SUFFIX)(void)

{

    if (CC_DST & SIGN_MASK)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jl_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    if ((DATA_STYPE)src1 < (DATA_STYPE)src2)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jle_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    if ((DATA_STYPE)src1 <= (DATA_STYPE)src2)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

/* oldies */

#if DATA_BITS >= 16

void OPPROTO glue(op_loopnz, SUFFIX)(void)

{

    if ((DATA_TYPE)ECX != 0 && !(T0 & CC_Z))

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_loopz, SUFFIX)(void)

{

    if ((DATA_TYPE)ECX != 0 && (T0 & CC_Z))

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jz_ecx, SUFFIX)(void)

{

    if ((DATA_TYPE)ECX == 0)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

void OPPROTO glue(op_jnz_ecx, SUFFIX)(void)

{

    if ((DATA_TYPE)ECX != 0)

        GOTO_LABEL_PARAM(1);

    FORCE_RET();

}

#endif

/* various optimized set cases */

void OPPROTO glue(op_setb_T0_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    T0 = ((DATA_TYPE)src1 < (DATA_TYPE)src2);

}

void OPPROTO glue(op_setz_T0_sub, SUFFIX)(void)

{

    T0 = ((DATA_TYPE)CC_DST == 0);

}

void OPPROTO glue(op_setbe_T0_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    T0 = ((DATA_TYPE)src1 <= (DATA_TYPE)src2);

}

void OPPROTO glue(op_sets_T0_sub, SUFFIX)(void)

{

    T0 = lshift(CC_DST, -(DATA_BITS - 1)) & 1;

}

void OPPROTO glue(op_setl_T0_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    T0 = ((DATA_STYPE)src1 < (DATA_STYPE)src2);

}

void OPPROTO glue(op_setle_T0_sub, SUFFIX)(void)

{

    target_long src1, src2;

    src1 = CC_DST + CC_SRC;

    src2 = CC_SRC;

    T0 = ((DATA_STYPE)src1 <= (DATA_STYPE)src2);

}

/* bit operations */

#if DATA_BITS >= 16

void OPPROTO glue(glue(op_bt, SUFFIX), _T0_T1_cc)(void)

{

    int count;

    count = T1 & SHIFT_MASK;

    CC_SRC = T0 >> count;

}

void OPPROTO glue(glue(op_bts, SUFFIX), _T0_T1_cc)(void)

{

    int count;

    count = T1 & SHIFT_MASK;

    T1 = T0 >> count;

    T0 |= (((target_long)1) << count);

}

void OPPROTO glue(glue(op_btr, SUFFIX), _T0_T1_cc)(void)

{

    int count;

    count = T1 & SHIFT_MASK;

    T1 = T0 >> count;

    T0 &= ~(((target_long)1) << count);

}

void OPPROTO glue(glue(op_btc, SUFFIX), _T0_T1_cc)(void)

{

    int count;

    count = T1 & SHIFT_MASK;

    T1 = T0 >> count;

    T0 ^= (((target_long)1) << count);

}

void OPPROTO glue(glue(op_add_bit, SUFFIX), _A0_T1)(void)

{

    A0 += ((DATA_STYPE)T1 >> (3 + SHIFT)) << SHIFT;

}

void OPPROTO glue(glue(op_bsf, SUFFIX), _T0_cc)(void)

{

    int count;

    target_long res;

    res = T0 & DATA_MASK;

    if (res != 0) {

        count = 0;

        while ((res & 1) == 0) {

            count++;

            res >>= 1;

        }

        T1 = count;

        CC_DST = 1; /* ZF = 0 */

    } else {

        CC_DST = 0; /* ZF = 1 */

    }

    FORCE_RET();

}

void OPPROTO glue(glue(op_bsr, SUFFIX), _T0_cc)(void)

{

    int count;

    target_long res;

    res = T0 & DATA_MASK;

    if (res != 0) {

        count = DATA_BITS - 1;

        while ((res & SIGN_MASK) == 0) {

            count--;

            res <<= 1;

        }

        T1 = count;

        CC_DST = 1; /* ZF = 0 */

    } else {

        CC_DST = 0; /* ZF = 1 */

    }

    FORCE_RET();

}

#endif

#if DATA_BITS == 32

void OPPROTO op_update_bt_cc(void)

{

    CC_SRC = T1;

}

#endif

/* string operations */

void OPPROTO glue(op_movl_T0_Dshift, SUFFIX)(void)

{

    T0 = DF << SHIFT;

}

#undef DATA_BITS

#undef SHIFT_MASK

#undef SHIFT1_MASK

#undef SIGN_MASK

#undef DATA_TYPE

#undef DATA_STYPE

#undef DATA_MASK

#undef SUFFIX