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comparison 68kinst.c @ 184:ebcbdd1c4cc8

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Fix a bunch of bugs in the CPU core, add a 68K debugger
author Mike Pavone <pavone@retrodev.com>
date Sun, 13 Jan 2013 13:01:13 -0800
parents 2f08d9e90a4c
children 7c227a8ec53d
comparison
equal deleted inserted replaced
183:2f08d9e90a4c 184:ebcbdd1c4cc8
477 #else 477 #else
478 decoded->op = M68K_INVALID; 478 decoded->op = M68K_INVALID;
479 break; 479 break;
480 #endif 480 #endif
481 } 481 }
482 decoded->dst.addr_mode = MODE_REG;
483 decoded->dst.addr_mode = m68k_reg_quick_field(*istream);
482 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src)); 484 istream = m68k_decode_op(istream, decoded->extra.size, &(decoded->src));
483 if (!istream) { 485 if (!istream) {
484 decoded->op = M68K_INVALID; 486 decoded->op = M68K_INVALID;
485 return start+1; 487 return start+1;
486 } 488 }
487 decoded->dst.addr_mode = MODE_REG;
488 decoded->dst.addr_mode = m68k_reg_quick_field(*istream);
489 } else { 489 } else {
490 opmode = (*istream >> 3) & 0x7; 490 opmode = (*istream >> 3) & 0x7;
491 if ((*istream & 0xB80) == 0x880 && opmode != MODE_REG && opmode != MODE_AREG) { 491 if ((*istream & 0xB80) == 0x880 && opmode != MODE_REG && opmode != MODE_AREG) {
492 //TODO: Check for invalid modes that are dependent on direction 492 //TODO: Check for invalid modes that are dependent on direction
493 decoded->op = M68K_MOVEM; 493 decoded->op = M68K_MOVEM;
957 } 957 }
958 } else { 958 } else {
959 //SUBX 959 //SUBX
960 decoded->op = M68K_SUBX; 960 decoded->op = M68K_SUBX;
961 decoded->extra.size = size; 961 decoded->extra.size = size;
962 istream = m68k_decode_op(istream, size, &(decoded->src));
963 if (!istream) {
964 decoded->op = M68K_INVALID;
965 return start+1;
966 }
967 decoded->dst.addr_mode = decoded->src.addr_mode;
968 decoded->dst.params.regs.pri = m68k_reg_quick_field(*istream); 962 decoded->dst.params.regs.pri = m68k_reg_quick_field(*istream);
963 decoded->src.params.regs.pri = *istream & 0x7;
964 if (*istream & 0x8) {
965 decoded->dst.addr_mode = decoded->src.addr_mode = MODE_AREG_PREDEC;
966 } else {
967 decoded->dst.addr_mode = decoded->src.addr_mode = MODE_REG;
968 }
969 } 969 }
970 } else { 970 } else {
971 if (size == OPSIZE_INVALID) { 971 if (size == OPSIZE_INVALID) {
972 //SUBA.w 972 //SUBA.w
973 decoded->extra.size = OPSIZE_WORD; 973 decoded->extra.size = OPSIZE_WORD;
999 if (!istream) { 999 if (!istream) {
1000 decoded->op = M68K_INVALID; 1000 decoded->op = M68K_INVALID;
1001 return start+1; 1001 return start+1;
1002 } 1002 }
1003 } else { 1003 } else {
1004 reg = m68k_reg_quick_field(*istream);
1004 istream = m68k_decode_op(istream, size, &(decoded->dst)); 1005 istream = m68k_decode_op(istream, size, &(decoded->dst));
1005 if (!istream) { 1006 if (!istream) {
1006 decoded->op = M68K_INVALID; 1007 decoded->op = M68K_INVALID;
1007 return start+1; 1008 return start+1;
1008 } 1009 }
1009 decoded->extra.size = size; 1010 decoded->extra.size = size;
1010 if (decoded->dst.addr_mode == MODE_AREG) { 1011 if (decoded->dst.addr_mode == MODE_AREG) {
1011 //CMPM 1012 //CMPM
1012 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_AREG_POSTINC; 1013 decoded->src.addr_mode = decoded->dst.addr_mode = MODE_AREG_POSTINC;
1013 decoded->src.params.regs.pri = decoded->dst.params.regs.pri; 1014 decoded->src.params.regs.pri = decoded->dst.params.regs.pri;
1014 decoded->dst.params.regs.pri = m68k_reg_quick_field(*istream); 1015 decoded->dst.params.regs.pri = reg;
1015 } else { 1016 } else {
1016 //EOR 1017 //EOR
1017 decoded->op = M68K_EOR; 1018 decoded->op = M68K_EOR;
1018 decoded->src.addr_mode = MODE_REG; 1019 decoded->src.addr_mode = MODE_REG;
1019 decoded->src.params.regs.pri = m68k_reg_quick_field(*istream); 1020 decoded->src.params.regs.pri = reg;
1020 } 1021 }
1021 } 1022 }
1022 } else { 1023 } else {
1023 //CMP or CMPA.w 1024 //CMP or CMPA.w
1024 if (size == OPSIZE_INVALID) { 1025 if (size == OPSIZE_INVALID) {
1140 } 1141 }
1141 } 1142 }
1142 } else { 1143 } else {
1143 //ADDX 1144 //ADDX
1144 decoded->op = M68K_ADDX; 1145 decoded->op = M68K_ADDX;
1145 //FIXME: Size is not technically correct
1146 decoded->extra.size = size; 1146 decoded->extra.size = size;
1147 istream = m68k_decode_op(istream, size, &(decoded->src));
1148 if (!istream) {
1149 decoded->op = M68K_INVALID;
1150 return start+1;
1151 }
1152 decoded->dst.addr_mode = decoded->src.addr_mode;
1153 decoded->dst.params.regs.pri = m68k_reg_quick_field(*istream); 1147 decoded->dst.params.regs.pri = m68k_reg_quick_field(*istream);
1148 decoded->src.params.regs.pri = *istream & 0x7;
1149 if (*istream & 0x8) {
1150 decoded->dst.addr_mode = decoded->src.addr_mode = MODE_AREG_PREDEC;
1151 } else {
1152 decoded->dst.addr_mode = decoded->src.addr_mode = MODE_REG;
1153 }
1154 } 1154 }
1155 } else { 1155 } else {
1156 if (size == OPSIZE_INVALID) { 1156 if (size == OPSIZE_INVALID) {
1157 //ADDA.w 1157 //ADDA.w
1158 decoded->extra.size = OPSIZE_WORD; 1158 decoded->extra.size = OPSIZE_WORD;