286 version of IRET sets flags properly, Windows 3.x works on 286 again.
Re-added useless word->word version of MOVZX, Windows/386 works again.
This commit is contained in:
parent
657aa19dd1
commit
94fc8ad3f9
4 changed files with 70 additions and 9 deletions
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@ -283,7 +283,7 @@ OpFn ops_386_0f[1024] =
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/*80*/ opJO_w, opJNO_w, opJB_w, opJNB_w, opJE_w, opJNE_w, opJBE_w, opJNBE_w, opJS_w, opJNS_w, opJP_w, opJNP_w, opJL_w, opJNL_w, opJLE_w, opJNLE_w,
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/*90*/ opSETO_a16, opSETNO_a16, opSETB_a16, opSETNB_a16, opSETE_a16, opSETNE_a16, opSETBE_a16, opSETNBE_a16, opSETS_a16, opSETNS_a16, opSETP_a16, opSETNP_a16, opSETL_a16, opSETNL_a16, opSETLE_a16, opSETNLE_a16,
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/*a0*/ opPUSH_FS_w, opPOP_FS_w, opCPUID, opBT_w_r_a16, opSHLD_w_i_a16, opSHLD_w_CL_a16,ILLEGAL, ILLEGAL, opPUSH_GS_w, opPOP_GS_w, ILLEGAL, opBTS_w_r_a16, opSHRD_w_i_a16, opSHRD_w_CL_a16,ILLEGAL, opIMUL_w_w_a16,
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/*b0*/ opCMPXCHG_b_a16,opCMPXCHG_w_a16,opLSS_w_a16, opBTR_w_r_a16, opLFS_w_a16, opLGS_w_a16, opMOVZX_w_b_a16,ILLEGAL, ILLEGAL, ILLEGAL, opBA_w_a16, opBTC_w_r_a16, opBSF_w_a16, opBSR_w_a16, opMOVSX_w_b_a16,ILLEGAL,
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/*b0*/ opCMPXCHG_b_a16,opCMPXCHG_w_a16,opLSS_w_a16, opBTR_w_r_a16, opLFS_w_a16, opLGS_w_a16, opMOVZX_w_b_a16,opMOVZX_w_w_a16,ILLEGAL, ILLEGAL, opBA_w_a16, opBTC_w_r_a16, opBSF_w_a16, opBSR_w_a16, opMOVSX_w_b_a16,ILLEGAL,
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/*c0*/ opXADD_b_a16, opXADD_w_a16, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, opBSWAP_EAX, opBSWAP_ECX, opBSWAP_EDX, opBSWAP_EBX, opBSWAP_ESP, opBSWAP_EBP, opBSWAP_ESI, opBSWAP_EDI,
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/*d0*/ ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL,
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@ -327,7 +327,7 @@ OpFn ops_386_0f[1024] =
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/*80*/ opJO_w, opJNO_w, opJB_w, opJNB_w, opJE_w, opJNE_w, opJBE_w, opJNBE_w, opJS_w, opJNS_w, opJP_w, opJNP_w, opJL_w, opJNL_w, opJLE_w, opJNLE_w,
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/*90*/ opSETO_a32, opSETNO_a32, opSETB_a32, opSETNB_a32, opSETE_a32, opSETNE_a32, opSETBE_a32, opSETNBE_a32, opSETS_a32, opSETNS_a32, opSETP_a32, opSETNP_a32, opSETL_a32, opSETNL_a32, opSETLE_a32, opSETNLE_a32,
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/*a0*/ opPUSH_FS_w, opPOP_FS_w, opCPUID, opBT_w_r_a32, opSHLD_w_i_a32, opSHLD_w_CL_a32,ILLEGAL, ILLEGAL, opPUSH_GS_w, opPOP_GS_w, ILLEGAL, opBTS_w_r_a32, opSHRD_w_i_a32, opSHRD_w_CL_a32,ILLEGAL, opIMUL_w_w_a32,
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/*b0*/ opCMPXCHG_b_a32,opCMPXCHG_w_a32,opLSS_w_a32, opBTR_w_r_a32, opLFS_w_a32, opLGS_w_a32, opMOVZX_w_b_a32,ILLEGAL, ILLEGAL, ILLEGAL, opBA_w_a32, opBTC_w_r_a32, opBSF_w_a32, opBSR_w_a32, opMOVSX_w_b_a32,ILLEGAL,
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/*b0*/ opCMPXCHG_b_a32,opCMPXCHG_w_a32,opLSS_w_a32, opBTR_w_r_a32, opLFS_w_a32, opLGS_w_a32, opMOVZX_w_b_a32,opMOVZX_w_w_a32,ILLEGAL, ILLEGAL, opBA_w_a32, opBTC_w_r_a32, opBSF_w_a32, opBSR_w_a32, opMOVSX_w_b_a32,ILLEGAL,
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/*c0*/ opXADD_b_a32, opXADD_w_a32, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, opBSWAP_EAX, opBSWAP_ECX, opBSWAP_EDX, opBSWAP_EBX, opBSWAP_ESP, opBSWAP_EBP, opBSWAP_ESI, opBSWAP_EDI,
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/*d0*/ ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL,
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@ -374,7 +374,7 @@ OpFn ops_winchip_0f[1024] =
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/*80*/ opJO_w, opJNO_w, opJB_w, opJNB_w, opJE_w, opJNE_w, opJBE_w, opJNBE_w, opJS_w, opJNS_w, opJP_w, opJNP_w, opJL_w, opJNL_w, opJLE_w, opJNLE_w,
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/*90*/ opSETO_a16, opSETNO_a16, opSETB_a16, opSETNB_a16, opSETE_a16, opSETNE_a16, opSETBE_a16, opSETNBE_a16, opSETS_a16, opSETNS_a16, opSETP_a16, opSETNP_a16, opSETL_a16, opSETNL_a16, opSETLE_a16, opSETNLE_a16,
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/*a0*/ opPUSH_FS_w, opPOP_FS_w, opCPUID, opBT_w_r_a16, opSHLD_w_i_a16, opSHLD_w_CL_a16,ILLEGAL, ILLEGAL, opPUSH_GS_w, opPOP_GS_w, ILLEGAL, opBTS_w_r_a16, opSHRD_w_i_a16, opSHRD_w_CL_a16,ILLEGAL, opIMUL_w_w_a16,
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/*b0*/ opCMPXCHG_b_a16,opCMPXCHG_w_a16,opLSS_w_a16, opBTR_w_r_a16, opLFS_w_a16, opLGS_w_a16, opMOVZX_w_b_a16,ILLEGAL, ILLEGAL, ILLEGAL, opBA_w_a16, opBTC_w_r_a16, opBSF_w_a16, opBSR_w_a16, opMOVSX_w_b_a16,ILLEGAL,
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/*b0*/ opCMPXCHG_b_a16,opCMPXCHG_w_a16,opLSS_w_a16, opBTR_w_r_a16, opLFS_w_a16, opLGS_w_a16, opMOVZX_w_b_a16,opMOVZX_w_w_a16,ILLEGAL, ILLEGAL, opBA_w_a16, opBTC_w_r_a16, opBSF_w_a16, opBSR_w_a16, opMOVSX_w_b_a16,ILLEGAL,
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/*c0*/ opXADD_b_a16, opXADD_w_a16, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, opBSWAP_EAX, opBSWAP_ECX, opBSWAP_EDX, opBSWAP_EBX, opBSWAP_ESP, opBSWAP_EBP, opBSWAP_ESI, opBSWAP_EDI,
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/*d0*/ ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL,
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@ -418,7 +418,7 @@ OpFn ops_winchip_0f[1024] =
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/*80*/ opJO_w, opJNO_w, opJB_w, opJNB_w, opJE_w, opJNE_w, opJBE_w, opJNBE_w, opJS_w, opJNS_w, opJP_w, opJNP_w, opJL_w, opJNL_w, opJLE_w, opJNLE_w,
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/*90*/ opSETO_a32, opSETNO_a32, opSETB_a32, opSETNB_a32, opSETE_a32, opSETNE_a32, opSETBE_a32, opSETNBE_a32, opSETS_a32, opSETNS_a32, opSETP_a32, opSETNP_a32, opSETL_a32, opSETNL_a32, opSETLE_a32, opSETNLE_a32,
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/*a0*/ opPUSH_FS_w, opPOP_FS_w, opCPUID, opBT_w_r_a32, opSHLD_w_i_a32, opSHLD_w_CL_a32,ILLEGAL, ILLEGAL, opPUSH_GS_w, opPOP_GS_w, ILLEGAL, opBTS_w_r_a32, opSHRD_w_i_a32, opSHRD_w_CL_a32,ILLEGAL, opIMUL_w_w_a32,
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/*b0*/ opCMPXCHG_b_a32,opCMPXCHG_w_a32,opLSS_w_a32, opBTR_w_r_a32, opLFS_w_a32, opLGS_w_a32, opMOVZX_w_b_a32,ILLEGAL, ILLEGAL, ILLEGAL, opBA_w_a32, opBTC_w_r_a32, opBSF_w_a32, opBSR_w_a32, opMOVSX_w_b_a32,ILLEGAL,
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/*b0*/ opCMPXCHG_b_a32,opCMPXCHG_w_a32,opLSS_w_a32, opBTR_w_r_a32, opLFS_w_a32, opLGS_w_a32, opMOVZX_w_b_a32,opMOVZX_w_w_a32,ILLEGAL, ILLEGAL, opBA_w_a32, opBTC_w_r_a32, opBSF_w_a32, opBSR_w_a32, opMOVSX_w_b_a32,ILLEGAL,
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/*c0*/ opXADD_b_a32, opXADD_w_a32, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, opBSWAP_EAX, opBSWAP_ECX, opBSWAP_EDX, opBSWAP_EBX, opBSWAP_ESP, opBSWAP_EBP, opBSWAP_ESI, opBSWAP_EDI,
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/*d0*/ ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL, ILLEGAL,
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@ -467,7 +467,7 @@ OpFn ops_286[1024] =
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/*a0*/ opMOV_AL_a16, opMOV_AX_a16, opMOV_a16_AL, opMOV_a16_AX, opMOVSB_a16, opMOVSW_a16, opCMPSB_a16, opCMPSW_a16, opTEST_AL, opTEST_AX, opSTOSB_a16, opSTOSW_a16, opLODSB_a16, opLODSW_a16, opSCASB_a16, opSCASW_a16,
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/*b0*/ opMOV_AL_imm, opMOV_CL_imm, opMOV_DL_imm, opMOV_BL_imm, opMOV_AH_imm, opMOV_CH_imm, opMOV_DH_imm, opMOV_BH_imm, opMOV_AX_imm, opMOV_CX_imm, opMOV_DX_imm, opMOV_BX_imm, opMOV_SP_imm, opMOV_BP_imm, opMOV_SI_imm, opMOV_DI_imm,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET_286,
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/*d0*/ opD0_a16, opD1_w_a16, opD2_a16, opD3_w_a16, opAAM, opAAD, opSETALC, opXLAT_a16, opESCAPE_d8_a16,opESCAPE_d9_a16,opESCAPE_da_a16,opESCAPE_db_a16,opESCAPE_dc_a16,opESCAPE_dd_a16,opESCAPE_de_a16,opESCAPE_df_a16,
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/*e0*/ opLOOPNE_w, opLOOPE_w, opLOOP_w, opJCXZ, opIN_AL_imm, opIN_AX_imm, opOUT_AL_imm, opOUT_AX_imm, opCALL_r16, opJMP_r16, opJMP_far_a16, opJMP_r8, opIN_AL_DX, opIN_AX_DX, opOUT_AL_DX, opOUT_AX_DX,
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/*f0*/ opLOCK, ILLEGAL, opREPNE, opREPE, opHLT, opCMC, opF6_a16, opF7_w_a16, opCLC, opSTC, opCLI, opSTI, opCLD, opSTD, opINCDEC_b_a16, opFF_w_a16,
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@ -489,7 +489,7 @@ OpFn ops_286[1024] =
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/*a0*/ opMOV_AL_a16, opMOV_AX_a16, opMOV_a16_AL, opMOV_a16_AX, opMOVSB_a16, opMOVSW_a16, opCMPSB_a16, opCMPSW_a16, opTEST_AL, opTEST_AX, opSTOSB_a16, opSTOSW_a16, opLODSB_a16, opLODSW_a16, opSCASB_a16, opSCASW_a16,
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/*b0*/ opMOV_AL_imm, opMOV_CL_imm, opMOV_DL_imm, opMOV_BL_imm, opMOV_AH_imm, opMOV_CH_imm, opMOV_DH_imm, opMOV_BH_imm, opMOV_AX_imm, opMOV_CX_imm, opMOV_DX_imm, opMOV_BX_imm, opMOV_SP_imm, opMOV_BP_imm, opMOV_SI_imm, opMOV_DI_imm,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET_286,
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/*d0*/ opD0_a16, opD1_w_a16, opD2_a16, opD3_w_a16, opAAM, opAAD, opSETALC, opXLAT_a16, opESCAPE_d8_a16,opESCAPE_d9_a16,opESCAPE_da_a16,opESCAPE_db_a16,opESCAPE_dc_a16,opESCAPE_dd_a16,opESCAPE_de_a16,opESCAPE_df_a16,
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/*e0*/ opLOOPNE_w, opLOOPE_w, opLOOP_w, opJCXZ, opIN_AL_imm, opIN_AX_imm, opOUT_AL_imm, opOUT_AX_imm, opCALL_r16, opJMP_r16, opJMP_far_a16, opJMP_r8, opIN_AL_DX, opIN_AX_DX, opOUT_AL_DX, opOUT_AX_DX,
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/*f0*/ opLOCK, ILLEGAL, opREPNE, opREPE, opHLT, opCMC, opF6_a16, opF7_w_a16, opCLC, opSTC, opCLI, opSTI, opCLD, opSTD, opINCDEC_b_a16, opFF_w_a16,
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@ -511,7 +511,7 @@ OpFn ops_286[1024] =
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/*a0*/ opMOV_AL_a16, opMOV_AX_a16, opMOV_a16_AL, opMOV_a16_AX, opMOVSB_a16, opMOVSW_a16, opCMPSB_a16, opCMPSW_a16, opTEST_AL, opTEST_AX, opSTOSB_a16, opSTOSW_a16, opLODSB_a16, opLODSW_a16, opSCASB_a16, opSCASW_a16,
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/*b0*/ opMOV_AL_imm, opMOV_CL_imm, opMOV_DL_imm, opMOV_BL_imm, opMOV_AH_imm, opMOV_CH_imm, opMOV_DH_imm, opMOV_BH_imm, opMOV_AX_imm, opMOV_CX_imm, opMOV_DX_imm, opMOV_BX_imm, opMOV_SP_imm, opMOV_BP_imm, opMOV_SI_imm, opMOV_DI_imm,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET_286,
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/*d0*/ opD0_a16, opD1_w_a16, opD2_a16, opD3_w_a16, opAAM, opAAD, opSETALC, opXLAT_a16, opESCAPE_d8_a16,opESCAPE_d9_a16,opESCAPE_da_a16,opESCAPE_db_a16,opESCAPE_dc_a16,opESCAPE_dd_a16,opESCAPE_de_a16,opESCAPE_df_a16,
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/*e0*/ opLOOPNE_w, opLOOPE_w, opLOOP_w, opJCXZ, opIN_AL_imm, opIN_AX_imm, opOUT_AL_imm, opOUT_AX_imm, opCALL_r16, opJMP_r16, opJMP_far_a16, opJMP_r8, opIN_AL_DX, opIN_AX_DX, opOUT_AL_DX, opOUT_AX_DX,
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/*f0*/ opLOCK, ILLEGAL, opREPNE, opREPE, opHLT, opCMC, opF6_a16, opF7_w_a16, opCLC, opSTC, opCLI, opSTI, opCLD, opSTD, opINCDEC_b_a16, opFF_w_a16,
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@ -533,7 +533,7 @@ OpFn ops_286[1024] =
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/*a0*/ opMOV_AL_a16, opMOV_AX_a16, opMOV_a16_AL, opMOV_a16_AX, opMOVSB_a16, opMOVSW_a16, opCMPSB_a16, opCMPSW_a16, opTEST_AL, opTEST_AX, opSTOSB_a16, opSTOSW_a16, opLODSB_a16, opLODSW_a16, opSCASB_a16, opSCASW_a16,
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/*b0*/ opMOV_AL_imm, opMOV_CL_imm, opMOV_DL_imm, opMOV_BL_imm, opMOV_AH_imm, opMOV_CH_imm, opMOV_DH_imm, opMOV_BH_imm, opMOV_AX_imm, opMOV_CX_imm, opMOV_DX_imm, opMOV_BX_imm, opMOV_SP_imm, opMOV_BP_imm, opMOV_SI_imm, opMOV_DI_imm,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET,
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/*c0*/ opC0_a16, opC1_w_a16, opRET_w_imm, opRET_w, opLES_w_a16, opLDS_w_a16, opMOV_b_imm_a16,opMOV_w_imm_a16,opENTER_w, opLEAVE_w, opRETF_a16_imm, opRETF_a16, opINT3, opINT, opINTO, opIRET_286,
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/*d0*/ opD0_a16, opD1_w_a16, opD2_a16, opD3_w_a16, opAAM, opAAD, opSETALC, opXLAT_a16, opESCAPE_d8_a16,opESCAPE_d9_a16,opESCAPE_da_a16,opESCAPE_db_a16,opESCAPE_dc_a16,opESCAPE_dd_a16,opESCAPE_de_a16,opESCAPE_df_a16,
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/*e0*/ opLOOPNE_w, opLOOPE_w, opLOOP_w, opJCXZ, opIN_AL_imm, opIN_AX_imm, opOUT_AL_imm, opOUT_AX_imm, opCALL_r16, opJMP_r16, opJMP_far_a16, opJMP_r8, opIN_AL_DX, opIN_AX_DX, opOUT_AL_DX, opOUT_AX_DX,
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/*f0*/ opLOCK, ILLEGAL, opREPNE, opREPE, opHLT, opCMC, opF6_a16, opF7_w_a16, opCLC, opSTC, opCLI, opSTI, opCLD, opSTD, opINCDEC_b_a16, opFF_w_a16,
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@ -117,7 +117,6 @@ static int opPOPF_286(uint32_t fetchdat)
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tempw = POP_W(); if (abrt) return 0;
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pclog("POPF_286 %04X:%04X %04X\n", CS, pc, tempw);
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if (!(msw & 1)) flags = (flags & 0x7000) | (tempw & 0x0fd5) | 2;
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else if (!(CPL)) flags = (tempw & 0x7fd5) | 2;
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else if (IOPLp) flags = (flags & 0x3000) | (tempw & 0x4fd5) | 2;
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cycles -= 3;
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return 0;
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}
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static int opMOVZX_w_w_a16(uint32_t fetchdat)
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{
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uint16_t temp;
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fetch_ea_16(fetchdat);
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temp = geteaw(); if (abrt) return 0;
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regs[reg].w = temp;
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cycles -= 3;
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return 0;
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}
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static int opMOVZX_w_w_a32(uint32_t fetchdat)
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{
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uint16_t temp;
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fetch_ea_32(fetchdat);
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temp = geteaw(); if (abrt) return 0;
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regs[reg].w = temp;
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cycles -= 3;
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return 0;
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}
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static int opMOVZX_l_w_a16(uint32_t fetchdat)
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{
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uint16_t temp;
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@ -68,6 +68,46 @@ static int opRETF_a32_imm(uint32_t fetchdat)
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return 0;
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}
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static int opIRET_286(uint32_t fetchdat)
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{
|
||||
if ((cr0 & 1) && (eflags & VM_FLAG) && (IOPL != 3))
|
||||
{
|
||||
x86gpf(NULL,0);
|
||||
return 0;
|
||||
}
|
||||
if (ssegs) ss = oldss;
|
||||
if (msw&1)
|
||||
{
|
||||
optype = IRET;
|
||||
pmodeiret(0);
|
||||
optype = 0;
|
||||
}
|
||||
else
|
||||
{
|
||||
uint16_t new_cs;
|
||||
oxpc = pc;
|
||||
if (stack32)
|
||||
{
|
||||
pc = readmemw(ss, ESP);
|
||||
new_cs = readmemw(ss, ESP + 2);
|
||||
flags = (flags & 0x7000) | (readmemw(ss, ESP + 4) & 0xffd5) | 2;
|
||||
ESP += 6;
|
||||
}
|
||||
else
|
||||
{
|
||||
pc = readmemw(ss, SP);
|
||||
new_cs = readmemw(ss, ((SP + 2) & 0xffff));
|
||||
flags = (flags & 0x7000) | (readmemw(ss, ((SP + 4) & 0xffff)) & 0x0fd5) | 2;
|
||||
SP += 6;
|
||||
}
|
||||
loadcs(new_cs);
|
||||
}
|
||||
flags_extract();
|
||||
cycles -= is486 ? 15 : 22;
|
||||
nmi_enable = 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int opIRET(uint32_t fetchdat)
|
||||
{
|
||||
if ((cr0 & 1) && (eflags & VM_FLAG) && (IOPL != 3))
|
||||
|
|
|
|||
Loading…
Reference in a new issue