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Implement indexed with 8-bit displacement addressing modes in decoder and disassembler
author Mike Pavone <pavone@retrodev.com>
date Fri, 21 Dec 2012 22:24:45 -0800
parents 36f1133837d0
children 645fe435cb48
comparison
equal deleted inserted replaced
78:463641032588 79:d212e0cd0b7e
29 ext = *(++cur); 29 ext = *(++cur);
30 dst->params.regs.pri = reg; 30 dst->params.regs.pri = reg;
31 dst->params.regs.displacement = sign_extend16(ext); 31 dst->params.regs.displacement = sign_extend16(ext);
32 break; 32 break;
33 case MODE_AREG_INDEX_MEM: 33 case MODE_AREG_INDEX_MEM:
34 //TODO: implement me 34 #ifdef M68020
35 //TODO: implement me for M68020+ support
36 #else
37 dst->addr_mode = MODE_AREG_INDEX_DISP8;
38 dst->params.regs.pri = reg;
39 ext = *(++cur);
40 dst->params.regs.sec = ext >> 11;//includes areg/dreg bit, reg num and word/long bit
41 dst->params.regs.displacement = sign_extend8(ext&0xFF);
42 #endif
35 break; 43 break;
36 case MODE_PC_INDIRECT_ABS_IMMED: 44 case MODE_PC_INDIRECT_ABS_IMMED:
37 switch(reg) 45 switch(reg)
38 { 46 {
39 case 0: 47 case 0:
44 case 1: 52 case 1:
45 dst->addr_mode = MODE_ABSOLUTE; 53 dst->addr_mode = MODE_ABSOLUTE;
46 ext = *(++cur); 54 ext = *(++cur);
47 dst->params.immed = ext << 16 | *(++cur); 55 dst->params.immed = ext << 16 | *(++cur);
48 break; 56 break;
57 case 3:
58 #ifdef M68020
59 //TODO: Implement me for M68020+ support;
60 #else
61 dst->addr_mode = MODE_PC_INDEX_DISP8;
62 ext = *(++cur);
63 dst->params.regs.sec = ext >> 11;//includes areg/dreg bit, reg num and word/long bit
64 dst->params.regs.displacement = sign_extend8(ext&0xFF);
65 #endif
49 case 2: 66 case 2:
50 dst->addr_mode = MODE_PC_DISPLACE; 67 dst->addr_mode = MODE_PC_DISPLACE;
51 ext = *(++cur); 68 ext = *(++cur);
52 dst->params.regs.displacement = sign_extend16(ext); 69 dst->params.regs.displacement = sign_extend16(ext);
53 break; 70 break;
65 case OPSIZE_LONG: 82 case OPSIZE_LONG:
66 dst->params.immed = ext << 16 | *(++cur); 83 dst->params.immed = ext << 16 | *(++cur);
67 break; 84 break;
68 } 85 }
69 break; 86 break;
70 //TODO: implement the rest of these
71 } 87 }
72 break; 88 break;
73 } 89 }
74 return cur; 90 return cur;
75 } 91 }
1145 case MODE_AREG_POSTINC: 1161 case MODE_AREG_POSTINC:
1146 return sprintf(dst, "%s (a%d)+", c, decoded->params.regs.pri); 1162 return sprintf(dst, "%s (a%d)+", c, decoded->params.regs.pri);
1147 case MODE_AREG_PREDEC: 1163 case MODE_AREG_PREDEC:
1148 return sprintf(dst, "%s -(a%d)", c, decoded->params.regs.pri); 1164 return sprintf(dst, "%s -(a%d)", c, decoded->params.regs.pri);
1149 case MODE_AREG_DISPLACE: 1165 case MODE_AREG_DISPLACE:
1150 return sprintf(dst, "%s (a%d, %d)", c, decoded->params.regs.pri, decoded->params.regs.displacement); 1166 return sprintf(dst, "%s (%d, a%d)", c, decoded->params.regs.displacement, decoded->params.regs.pri);
1167 case MODE_AREG_INDEX_DISP8:
1168 return sprintf(dst, "%s (%d, a%d, %c%d.%c)", c, decoded->params.regs.displacement, decoded->params.regs.pri, (decoded->params.regs.sec & 0x10) ? 'a': 'd', (decoded->params.regs.sec >> 1) & 0x7, (decoded->params.regs.sec & 1) ? 'l': 'w');
1151 case MODE_IMMEDIATE: 1169 case MODE_IMMEDIATE:
1152 case MODE_IMMEDIATE_WORD: 1170 case MODE_IMMEDIATE_WORD:
1153 return sprintf(dst, (decoded->params.immed <= 128 ? "%s #%d" : "%s #$%X"), c, decoded->params.immed); 1171 return sprintf(dst, (decoded->params.immed <= 128 ? "%s #%d" : "%s #$%X"), c, decoded->params.immed);
1154 case MODE_ABSOLUTE_SHORT: 1172 case MODE_ABSOLUTE_SHORT:
1155 return sprintf(dst, "%s $%X.w", c, decoded->params.immed); 1173 return sprintf(dst, "%s $%X.w", c, decoded->params.immed);
1156 case MODE_ABSOLUTE: 1174 case MODE_ABSOLUTE:
1157 return sprintf(dst, "%s $%X", c, decoded->params.immed); 1175 return sprintf(dst, "%s $%X", c, decoded->params.immed);
1158 case MODE_PC_DISPLACE: 1176 case MODE_PC_DISPLACE:
1159 return sprintf(dst, "%s (pc, %d)", c, decoded->params.regs.displacement); 1177 return sprintf(dst, "%s (%d, pc)", c, decoded->params.regs.displacement);
1178 case MODE_PC_INDEX_DISP8:
1179 return sprintf(dst, "%s (%d, pc, %c%d.%c)", c, decoded->params.regs.displacement, (decoded->params.regs.sec & 0x10) ? 'a': 'd', (decoded->params.regs.sec >> 1) & 0x7, (decoded->params.regs.sec & 1) ? 'l': 'w');
1160 default: 1180 default:
1161 return 0; 1181 return 0;
1162 } 1182 }
1163 } 1183 }
1164 1184