ops2.c

来自「适合KS8695X」· C语言代码 · 共 2,397 行 · 第 1/5 页
2,397 行
	}
	break;
    case 3:                     /* register to register */
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *srcreg;
	    u32 mask;
	    u8 shift;

	    srcreg = DECODE_RM_LONG_REGISTER(rl);
	    DECODE_PRINTF(",");
	    shift = fetch_byte_imm();
	    TRACE_AND_STEP();
	    bit = shift & 0x1F;
	    mask = (0x1 << bit);
	    CONDITIONAL_SET_FLAG(*srcreg & mask,F_CF);
	    switch (rh) {
	    case 4:
		*srcreg |= mask;
		break;
	    case 5:
		*srcreg &= ~mask;
		break;
	    case 6:
		*srcreg ^= mask;
		break;
	    default:
		break;
	    }
	} else {
	    u16 *srcreg;
	    u16 mask;
	    u8 shift;

	    srcreg = DECODE_RM_WORD_REGISTER(rl);
	    DECODE_PRINTF(",");
	    shift = fetch_byte_imm();
	    TRACE_AND_STEP();
	    bit = shift & 0xF;
	    mask = (0x1 << bit);
	    CONDITIONAL_SET_FLAG(*srcreg & mask,F_CF);
	    switch (rh) {
	    case 4:
		*srcreg |= mask;
		break;
	    case 5:
		*srcreg &= ~mask;
		break;
	    case 6:
		*srcreg ^= mask;
		break;
	    default:
		break;
	    }
	}
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xbb
****************************************************************************/
void x86emuOp2_btc_R(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint srcoffset;
    int bit,disp;

    START_OF_INSTR();
    DECODE_PRINTF("BTC\t");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch (mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval,mask;
	    u32 *shiftreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    mask = (0x1 << bit);
	    CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
	    store_data_long(srcoffset+disp, srcval ^ mask);
	} else {
	    u16 srcval,mask;
	    u16 *shiftreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
			mask = (u16)(0x1 << bit);
	    CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
			store_data_word(srcoffset+disp, (u16)(srcval ^ mask));
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval,mask;
	    u32 *shiftreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    mask = (0x1 << bit);
	    CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
	    store_data_long(srcoffset+disp, srcval ^ mask);
	} else {
	    u16 srcval,mask;
	    u16 *shiftreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
			mask = (u16)(0x1 << bit);
			CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
			store_data_word(srcoffset+disp, (u16)(srcval ^ mask));
	}
	break;
    case 2:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval,mask;
	    u32 *shiftreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    disp = (s16)*shiftreg >> 5;
	    srcval = fetch_data_long(srcoffset+disp);
	    mask = (0x1 << bit);
	    CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
	    store_data_long(srcoffset+disp, srcval ^ mask);
	} else {
	    u16 srcval,mask;
	    u16 *shiftreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0xF;
	    disp = (s16)*shiftreg >> 4;
	    srcval = fetch_data_word(srcoffset+disp);
			mask = (u16)(0x1 << bit);
			CONDITIONAL_SET_FLAG(srcval & mask,F_CF);
			store_data_word(srcoffset+disp, (u16)(srcval ^ mask));
	}
	break;
    case 3:                     /* register to register */
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
			u32 *srcreg,*shiftreg;
	    u32 mask;

	    srcreg = DECODE_RM_LONG_REGISTER(rl);
	    DECODE_PRINTF(",");
	    shiftreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    bit = *shiftreg & 0x1F;
	    mask = (0x1 << bit);
			CONDITIONAL_SET_FLAG(*srcreg & mask,F_CF);
			*srcreg ^= mask;
		} else {
			u16 *srcreg,*shiftreg;
			u16 mask;

			srcreg = DECODE_RM_WORD_REGISTER(rl);
			DECODE_PRINTF(",");
			shiftreg = DECODE_RM_WORD_REGISTER(rh);
			TRACE_AND_STEP();
			bit = *shiftreg & 0xF;
			mask = (u16)(0x1 << bit);
	    CONDITIONAL_SET_FLAG(*srcreg & mask,F_CF);
	    *srcreg ^= mask;
	}
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xbc
****************************************************************************/
void x86emuOp2_bsf(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint srcoffset;

    START_OF_INSTR();
    DECODE_PRINTF("BSF\n");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch(mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 32; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 16; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 32; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 16; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 2:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 32; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 16; (*dstreg)++)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 3:				/* register to register */
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *srcreg, *dstreg;

	    srcreg = DECODE_RM_LONG_REGISTER(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 32; (*dstreg)++)
		if ((*srcreg >> *dstreg) & 1) break;
	} else {
	    u16 *srcreg, *dstreg;

	    srcreg = DECODE_RM_WORD_REGISTER(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
	    for(*dstreg = 0; *dstreg < 16; (*dstreg)++)
		if ((*srcreg >> *dstreg) & 1) break;
	}
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xbd
****************************************************************************/
void x86emuOp2_bsr(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint srcoffset;

    START_OF_INSTR();
    DECODE_PRINTF("BSF\n");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch(mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 31; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm00_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 15; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 31; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm01_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 15; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 2:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 srcval, *dstreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_long(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 31; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	} else {
	    u16 srcval, *dstreg;

	    srcoffset = decode_rm10_address(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    srcval = fetch_data_word(srcoffset);
	    CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
	    for(*dstreg = 15; *dstreg > 0; (*dstreg)--)
		if ((srcval >> *dstreg) & 1) break;
	}
	break;
    case 3:				/* register to register */
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *srcreg, *dstreg;

	    srcreg = DECODE_RM_LONG_REGISTER(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_LONG_REGISTER(rh);
	    TRACE_AND_STEP();
	    CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
	    for(*dstreg = 31; *dstreg > 0; (*dstreg)--)
		if ((*srcreg >> *dstreg) & 1) break;
	} else {
	    u16 *srcreg, *dstreg;

	    srcreg = DECODE_RM_WORD_REGISTER(rl);
	    DECODE_PRINTF(",");
	    dstreg = DECODE_RM_WORD_REGISTER(rh);
	    TRACE_AND_STEP();
	    CONDITIONAL_SET_FLAG(*srcreg == 0, F_ZF);
	    for(*dstreg = 15; *dstreg > 0; (*dstreg)--)
		if ((*srcreg >> *dstreg) & 1) break;
	}
	break;
    }
    DECODE_CLEAR_SEGOVR();
    END_OF_INSTR();
}

/****************************************************************************
REMARKS:
Handles opcode 0x0f,0xbe
****************************************************************************/
void x86emuOp2_movsx_byte_R_RM(u8 X86EMU_UNUSED(op2))
{
    int mod, rl, rh;
    uint srcoffset;

    START_OF_INSTR();
    DECODE_PRINTF("MOVSX\t");
    FETCH_DECODE_MODRM(mod, rh, rl);
    switch (mod) {
    case 0:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *destreg;
	    u32 srcval;

	    destreg = DECODE_RM_LONG_REGISTER(rh);
	    DECODE_PRINTF(",");
	    srcoffset = decode_rm00_address(rl);
	    srcval = (s32)((s8)fetch_data_byte(srcoffset));
	    DECODE_PRINTF("\n");
	    TRACE_AND_STEP();
	    *destreg = srcval;
	} else {
	    u16 *destreg;
	    u16 srcval;

	    destreg = DECODE_RM_WORD_REGISTER(rh);
	    DECODE_PRINTF(",");
	    srcoffset = decode_rm00_address(rl);
	    srcval = (s16)((s8)fetch_data_byte(srcoffset));
	    DECODE_PRINTF("\n");
	    TRACE_AND_STEP();
	    *destreg = srcval;
	}
	break;
    case 1:
	if (M.x86.mode & SYSMODE_PREFIX_DATA) {
	    u32 *destreg;
	    u32 srcval;

	    destreg = DECODE_RM_LONG_REGISTER(rh);
	    DECODE_PRINTF(",");
	    srcoffset = decode_rm01_ad
ops2.c - 源码说明

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