diff options
Diffstat (limited to '68kinst.c')
| -rw-r--r-- | 68kinst.c | 146 |
1 files changed, 146 insertions, 0 deletions
@@ -168,16 +168,162 @@ uint16_t * m68K_decode(uint16_t * istream, m68kinst * decoded) } break; case 1: + //ANDI, ANDI to CCR, ANDI to SR, CMP2.w CHK2.w + if ((*istream & 0xFF) == 0x3C) { + decoded->op = M68K_ANDI_CCR; + decoded->extra.size = OPSIZE_BYTE; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->src.params.u8 = *(++istream); + } else if((*istream & 0xFF) == 0x7C) { + decoded->op = M68K_ANDI_SR; + decoded->extra.size = OPSIZE_WORD; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->src.params.u16 = *(++istream); + } else { + //ANDI, CMP2.w, CHK2.w + if ((*istream & 0xC0) != 0xC0) { + decoded->op = M68K_AND; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->extra.size = size = (*istream >> 6) & 3; + reg = *istream & 0x7; + opmode = (*istream >> 3) & 0x7; + switch (size) + { + case OPSIZE_BYTE: + decoded->src.params.u8 = *(++istream); + break; + case OPSIZE_WORD: + decoded->src.params.16 = *(++istream); + break; + case OPSIZE_LONG: + immed = *(++istream); + decoded->src.params.u32 = immed << 16 | *(++istream); + break; + } + istream = m68k_decode_op_ex(istream, opmode, reg, size, &(decoded->dst)); + } else { + #ifdef M68020 + //TODO: Implement me for 68020 support + #endif + } + } break; case 2: + //SUBI, CMP2.l, CHK2.l + if ((*istream & 0xC0) != 0xC0) { + decoded->op = M68K_SUB; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->extra.size = size = (*istream >> 6) & 3; + reg = *istream & 0x7; + opmode = (*istream >> 3) & 0x7; + switch (size) + { + case OPSIZE_BYTE: + decoded->src.params.u8 = *(++istream); + break; + case OPSIZE_WORD: + decoded->src.params.16 = *(++istream); + break; + case OPSIZE_LONG: + immed = *(++istream); + decoded->src.params.u32 = immed << 16 | *(++istream); + break; + } + istream = m68k_decode_op_ex(istream, opmode, reg, size, &(decoded->dst)); + } else { + #ifdef M68020 + //TODO: Implement me for 68020 support + #endif + } break; case 3: + //RTM, CALLM, ADDI + if ((*istream & 0xC0) != 0xC0) { + decoded->op = M68K_ADD; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->extra.size = size = (*istream >> 6) & 3; + reg = *istream & 0x7; + opmode = (*istream >> 3) & 0x7; + switch (size) + { + case OPSIZE_BYTE: + decoded->src.params.u8 = *(++istream); + break; + case OPSIZE_WORD: + decoded->src.params.16 = *(++istream); + break; + case OPSIZE_LONG: + immed = *(++istream); + decoded->src.params.u32 = immed << 16 | *(++istream); + break; + } + istream = m68k_decode_op_ex(istream, opmode, reg, size, &(decoded->dst)); + } else { + #ifdef M68020 + //TODO: Implement me for 68020 support + #endif + } break; case 4: + //BTST, BCHG, BCLR, BSET + switch ((*istream >> 6) & 0x3) + { + case 0: + decoded->op = M68K_BTST; + break; + case 1: + decoded->op = M68K_BCHG; + break; + case 2: + decoded->op = M68K_BCLR; + break; + case 3: + decoded->op = M68K_BSET; + break; + } + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->src.params.u8 = *(++istream); + istream = m68k_decode_op(istream, OPSIZE_BYTE, &(decoded->dst)); break; case 5: + //EORI, EORI to CCR, EORI to SR + if ((*istream & 0xFF) == 0x3C) { + decoded->op = M68K_EORI_CCR; + decoded->extra.size = OPSIZE_BYTE; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->src.params.u8 = *(++istream); + } else if((*istream & 0xFF) == 0x7C) { + decoded->op = M68K_EORI_SR; + decoded->extra.size = OPSIZE_WORD; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->src.params.u16 = *(++istream); + } else { + //EORI, CMP2.w, CHK2.w + if ((*istream & 0xC0) != 0xC0) { + decoded->op = M68K_EOR; + decoded->src.addr_mode = MODE_IMMEDIATE; + decoded->extra.size = size = (*istream >> 6) & 3; + reg = *istream & 0x7; + opmode = (*istream >> 3) & 0x7; + switch (size) + { + case OPSIZE_BYTE: + decoded->src.params.u8 = *(++istream); + break; + case OPSIZE_WORD: + decoded->src.params.16 = *(++istream); + break; + case OPSIZE_LONG: + immed = *(++istream); + decoded->src.params.u32 = immed << 16 | *(++istream); + break; + } + istream = m68k_decode_op_ex(istream, opmode, reg, size, &(decoded->dst)); + } + } break; case 6: + break; case 7: break; |