realmodeudecoder.java

JPC: x86 PC Hardware Emulator. 牛津大学开发的一个纯JAVA的x86系统结构硬件模拟器。

			working.write(REPNE_CMPSD_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(CMPSD_A32);
		    else
			working.write(CMPSD_A16);
		}
	    } else {
		if ((prefices & PREFICES_REPE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPE_CMPSW_A32);
		    else
			working.write(REPE_CMPSW_A16);
		} else if ((prefices & PREFICES_REPNE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPNE_CMPSW_A32);
		    else
			working.write(REPNE_CMPSW_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(CMPSW_A32);
		    else
			working.write(CMPSW_A16);
		}
	    }
	    break;
	    
	case 0xaa: //STOSB
	    if ((prefices & PREFICES_REP) != 0) {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(REP_STOSB_A32);
		else
		    working.write(REP_STOSB_A16);
	    } else {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(STOSB_A32);
		else
		    working.write(STOSB_A16);
	    }
	    break;

	case 0xab: //STOSW/STOSD
	    if ((prefices & PREFICES_OPERAND) != 0) {
		if ((prefices & PREFICES_REP) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REP_STOSD_A32);
		    else
			working.write(REP_STOSD_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(STOSD_A32);
		    else
			working.write(STOSD_A16);
		}
	    } else {
		if ((prefices & PREFICES_REP) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REP_STOSW_A32);
		    else
			working.write(REP_STOSW_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(STOSW_A32);
		    else
			working.write(STOSW_A16);
		}
	    }
	    break;

	case 0xac: //LODSB
	    if ((prefices & PREFICES_REP) != 0) {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(REP_LODSB_A32);
		else
		    working.write(REP_LODSB_A16);
	    } else {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(LODSB_A32);
		else
		    working.write(LODSB_A16);
	    }
	    break;

	case 0xad: //LODSW/LODSD
	    if ((prefices & PREFICES_OPERAND) != 0) {
		if ((prefices & PREFICES_REP) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REP_LODSD_A32);
		    else
			working.write(REP_LODSD_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(LODSD_A32);
		    else
			working.write(LODSD_A16);
		}
	    } else {
		if ((prefices & PREFICES_REP) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REP_LODSW_A32);
		    else
			working.write(REP_LODSW_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(LODSW_A32);
		    else
			working.write(LODSW_A16);
		}
	    }
	    break;

	case 0xae: //SCASB
	    if ((prefices & PREFICES_REPE) != 0) {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(REPE_SCASB_A32);
		else
		    working.write(REPE_SCASB_A16);
	    } else if ((prefices & PREFICES_REPNE) != 0) {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(REPNE_SCASB_A32);
		else
		    working.write(REPNE_SCASB_A16);
	    } else {
		if ((prefices & PREFICES_ADDRESS) != 0)
		    working.write(SCASB_A32);
		else
		    working.write(SCASB_A16);
	    }
	    break;

	case 0xaf: //SCASW/D
	    if ((prefices & PREFICES_OPERAND) != 0) {
		if ((prefices & PREFICES_REPE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPE_SCASD_A32);
		    else
			working.write(REPE_SCASD_A16);
		} else if ((prefices & PREFICES_REPNE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPNE_SCASD_A32);
		    else
			working.write(REPNE_SCASD_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(SCASD_A32);
		    else
			working.write(SCASD_A16);
		}
	    } else {
		if ((prefices & PREFICES_REPE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPE_SCASW_A32);
		    else
			working.write(REPE_SCASW_A16);
		} else if ((prefices & PREFICES_REPNE) != 0) {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(REPNE_SCASW_A32);
		    else
			working.write(REPNE_SCASW_A16);
		} else {
		    if ((prefices & PREFICES_ADDRESS) != 0)
			working.write(SCASW_A32);
		    else
			working.write(SCASW_A16);
		}
	    }
	    break;

	case 0xc0:
	case 0xd0:
	case 0xd2:
	    switch (modrm & 0x38) {
	    case 0x00:
		working.write(ROL_O8); break;
	    case 0x08:
		working.write(ROR_O8); break;
	    case 0x10:
		working.write(RCL_O8); break;
	    case 0x18:
		working.write(RCR_O8); break;
	    case 0x20:
		working.write(SHL); break;
	    case 0x28:
		working.write(SHR); break;
	    case 0x30:
		System.err.println("Using invalid SHL encoding");
		working.write(SHL); break;
	    case 0x38:
		working.write(SAR_O8); break;
	    }
	    break;

	case 0xc1:
	case 0xd1:
	case 0xd3:
	    if ((prefices & PREFICES_OPERAND) != 0) {
		switch (modrm & 0x38) {
		case 0x00:
		    working.write(ROL_O32); break;
		case 0x08:
		    working.write(ROR_O32); break;
		case 0x10:
		    working.write(RCL_O32); break;
		case 0x18:
		    working.write(RCR_O32); break;
		case 0x20:
		    working.write(SHL); break;
		case 0x28:
		    working.write(SHR); break;
		case 0x30:
		    System.err.println("Using invalid SHL encoding");
		    working.write(SHL); break;
		case 0x38:
		    working.write(SAR_O32); break;
		}
	    } else {
		switch (modrm & 0x38) {
		case 0x00:
		    working.write(ROL_O16); break;
		case 0x08:
		    working.write(ROR_O16); break;
		case 0x10:
		    working.write(RCL_O16); break;
		case 0x18:
		    working.write(RCR_O16); break;
		case 0x20:
		    working.write(SHL); break;
		case 0x28:
		    working.write(SHR); break;
		case 0x30:
		    System.err.println("Using invalid SHL encoding");
		    working.write(SHL); break;
		case 0x38:
		    working.write(SAR_O16); break;
		}
	    }
	    break;

	case 0xc2:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(RET_IW_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(RET_IW_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(RET_IW_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(RET_IW_O32_A32); break;
	    }
	    break;

	case 0xc3: //RET
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(RET_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(RET_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(RET_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(RET_O32_A32); break;
	    }
	    break;

	case 0xc8:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(ENTER_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(ENTER_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(ENTER_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(ENTER_O32_A32); break;
	    }
	    break;

	case 0xc9:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(LEAVE_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(LEAVE_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(LEAVE_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(LEAVE_O32_A32); break;
	    }
	    break;

	case 0xca:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(RET_FAR_IW_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(RET_FAR_IW_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(RET_FAR_IW_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(RET_FAR_IW_O32_A32); break;
	    }
	    break;

	case 0xcb:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(RET_FAR_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(RET_FAR_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(RET_FAR_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(RET_FAR_O32_A32); break;
	    }
	    break;

	case 0xcc:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(INT3_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(INT3_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(INT3_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(INT3_O32_A32); break;
	    }
	    break;

	case 0xcd:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(INT_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(INT_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(INT_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(INT_O32_A32); break;
	    }
	    break;

	case 0xce:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(INTO_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(INTO_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(INTO_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(INTO_O32_A32); break;
	    }
	    break;

	case 0xcf:
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(IRET_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(IRET_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(IRET_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(IRET_O32_A32); break;
	    }
	    break;

	case 0xd4: working.write(AAM); break; //AAM
	case 0xd5: working.write(AAD); break; //AAD

	case 0xe0: //LOOPNZ Jb
	    if ((prefices & PREFICES_ADDRESS) != 0)
		working.write(LOOPNZ_ECX);
	    else
		working.write(LOOPNZ_CX);
	    break;

	case 0xe1: //LOOPZ Jb
	    if ((prefices & PREFICES_ADDRESS) != 0)
		working.write(LOOPZ_ECX);
	    else
		working.write(LOOPZ_CX);
	    break;

	case 0xe2: //LOOP Jb
	    if ((prefices & PREFICES_ADDRESS) != 0)
		working.write(LOOP_ECX);
	    else
		working.write(LOOP_CX);
	    break;

	case 0xe3: //JCXZ 
	    if ((prefices & PREFICES_ADDRESS) != 0)
		working.write(JECXZ);
	    else
		working.write(JCXZ);
	    break;

	case 0xe4: //IN AL, Ib
	case 0xec: working.write(IN_O8); break; //IN AL, DX

	case 0xe5: //IN eAX, Ib
	case 0xed: //IN eAX, DX
	    if ((prefices & PREFICES_OPERAND) != 0)
		working.write(IN_O32);
	    else
		working.write(IN_O16);
	    break;
	    
	case 0xe6: //OUT Ib, AL
	case 0xee: working.write(OUT_O8); break; //OUT DX, AL 

	case 0xe7: //OUT Ib, eAX
	case 0xef: //OUT DX, eAX
	    if ((prefices & PREFICES_OPERAND) != 0)
		working.write(OUT_O32);
	    else
		working.write(OUT_O16);
	    break;

	case 0xe8: //CALL Jv
	    switch (prefices & (PREFICES_OPERAND | PREFICES_ADDRESS)) {
	    case 0:
		working.write(CALL_O16_A16); break;
	    case PREFICES_OPERAND:
		working.write(CALL_O32_A16); break;
	    case PREFICES_ADDRESS:
		working.write(CALL_O16_A32); break;
	    case PREFICES_ADDRESS | PREFICES_OPERAND:
		working.write(CALL_O32_A32); break;
	    }
	    break;

	case 0xe9: //JMP Jv
	    if ((prefices & PREFICES_OPERAND) != 0)
		working.write(JUMP_O32);
	    else
		working.write(JUMP_O16);
	    break;

	case 0xea: //JMPF Ap
	    if ((prefices & PREFICES_OPERAND) != 0)
		working.write(JUMP_FAR_O32);
	    else
		working.write(JUMP_FAR_O16);
	    break;

	case 0xeb: working.write(JUMP_O8); break; //JMP Jb

	case 0xf4: working.write(HALT); break; //HLT

	case 0xf5: working.write(CMC); break; //CMC

	case 0xf6: //UNA GP3 Eb
	    switch (modrm & 0x38) {
	    case 0x00:
		working.write(AND); break;
	    case 0x10:
		working.write(NOT); break;
	    case 0x18:
		working.write(NEG); break;