diff options
Diffstat (limited to 'disasm.cpp')
| -rw-r--r-- | disasm.cpp | 57 |
1 files changed, 44 insertions, 13 deletions
@@ -1417,11 +1417,49 @@ static void disasm_moveq(DisasmNode &node, uint16_t instr, const DataBuffer &cod } -static void disasm_divu_divs( - DisasmNode &node, uint16_t instr, const DataBuffer &code, const Settings &s) +static void disasm_divu_divs_mulu_muls( + DisasmNode &node, + uint16_t instr, + const DataBuffer &code, + const Settings &s, + const char *mnemonic) { - // TODO Implement - return disasm_verbatim(node, instr, code, s); + const char suffix = 'w'; + const auto src = AddrModeArg::Fetch( + node.offset + kInstructionSizeStepBytes, code, instr, suffix); + switch (src.mode) { + case AddrMode::kInvalid: + return disasm_verbatim(node, instr, code, s); + case AddrMode::kDn: + break; + case AddrMode::kAn: + return disasm_verbatim(node, instr, code, s); + /* Fall through */ + case AddrMode::kAnAddr: + case AddrMode::kAnAddrIncr: + case AddrMode::kAnAddrDecr: + case AddrMode::kD16AnAddr: + case AddrMode::kD8AnXiAddr: + case AddrMode::kWord: + case AddrMode::kLong: + break; + case AddrMode::kD16PCAddr: + case AddrMode::kD8PCXiAddr: + case AddrMode::kImmediate: + break; + } + const unsigned dn = (instr >> 9) & 7; + const auto dst = AddrModeArg::Dn(dn); + char dst_str[32]{}; + char src_str[32]{}; + dst.SNPrint(dst_str, sizeof(dst_str)); + src.SNPrint(src_str, sizeof(src_str)); + const bool is_signed = (instr >> 8) & 1; + const char sign_suffix = is_signed ? 's' : 'u'; + snprintf(node.mnemonic, kMnemonicBufferSize, "%s%c%c", mnemonic, sign_suffix, suffix); + snprintf(node.arguments, kArgsBufferSize, "%s,%s", src_str, dst_str); + node.size = kInstructionSizeStepBytes + dst.Size() + src.Size(); + } static void disasm_addx_subx_abcd_sbcd( @@ -1534,7 +1572,7 @@ static void disasm_divu_divs_sbcd_or( } const OpSize opsize = static_cast<OpSize>((instr >> 6) & 3); if (opsize == OpSize::kInvalid) { - return disasm_divu_divs(node, instr, code, s); + return disasm_divu_divs_mulu_muls(node, instr, code, s, "div"); } return disasm_or_and(node, instr, code, s, opsize, "or"); } @@ -1545,13 +1583,6 @@ static void disasm_chunk_b(DisasmNode &n, uint16_t i, const DataBuffer &c, const return disasm_verbatim(n, i, c, s); } -static void disasm_mulu_muls( - DisasmNode &node, uint16_t instr, const DataBuffer &code, const Settings &s) -{ - // TODO Implement - return disasm_verbatim(node, instr, code, s); -} - static inline void disasm_exg(DisasmNode &node, uint16_t instr) { assert((instr & 0x130) == 0x100); @@ -1586,7 +1617,7 @@ static void disasm_chunk_c( } const OpSize opsize = static_cast<OpSize>((instr >> 6) & 3); if (opsize == OpSize::kInvalid) { - return disasm_mulu_muls(node, instr, code, s); + return disasm_divu_divs_mulu_muls(node, instr, code, s, "mul"); } const unsigned m_split = instr & 0x1f8; if (m_split == 0x188 || m_split == 0x148 || m_split == 0x140) { |