diff options
Diffstat (limited to 'src/devices/cpu/we32000/we32100d.cpp')
-rw-r--r-- | src/devices/cpu/we32000/we32100d.cpp | 63 |
1 files changed, 54 insertions, 9 deletions
diff --git a/src/devices/cpu/we32000/we32100d.cpp b/src/devices/cpu/we32000/we32100d.cpp index 2552c60b5fe..a14cae7008a 100644 --- a/src/devices/cpu/we32000/we32100d.cpp +++ b/src/devices/cpu/we32000/we32100d.cpp @@ -65,6 +65,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 util::stream_format(stream, "invalid(0x%02x)", n); else { + // Positive or negative literal stream << "&"; format_signed(stream, s8(n)); } @@ -72,11 +73,15 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 case 0x40: if (n != 0x4f) + { + // Register util::stream_format(stream, "%%%s", s_rnames[n & 0x0f]); + } else if (dst) util::stream_format(stream, "invalid(0x%02x)", n); else { + // Word immediate util::stream_format(stream, "&0x%08x", swapendian_int32(opcodes.r32(pc))); pc += 4; } @@ -84,11 +89,15 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 case 0x50: if (n != 0x5b && n != 0x5f) + { + // Register deferred util::stream_format(stream, "(%%%s)", s_rnames[n & 0x0f]); + } else if (n == 0x5b || dst) util::stream_format(stream, "invalid(0x%02x)", n); else { + // Halfword immediate util::stream_format(stream, "&0x%04x", swapendian_int16(opcodes.r16(pc))); pc += 2; } @@ -97,23 +106,29 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 case 0x60: if (n != 0x6f) { + // FP short offset format_signed(stream, n & 0x0f); stream << "(%fp)"; } else if (dst) util::stream_format(stream, "invalid(0x%02x)", n); else + { + // Byte immediate util::stream_format(stream, "&0x%02x", opcodes.r8(pc++)); + } break; case 0x70: if (n != 0x7f) { + // AP short offset format_signed(stream, n & 0x0f); stream << "(%ap)"; } else { + // Absolute util::stream_format(stream, "$0x%08x", swapendian_int32(opcodes.r32(pc))); pc += 4; } @@ -124,6 +139,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 util::stream_format(stream, "invalid(0x%02x)", n); else { + // Word displacement or displacement deferred if (BIT(n, 4)) stream << "*"; format_signed(stream, s32(swapendian_int32(opcodes.r32(pc)))); @@ -137,6 +153,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 util::stream_format(stream, "invalid(0x%02x)", n); else { + // Halfword displacement or displacement deferred if (BIT(n, 4)) stream << "*"; format_signed(stream, s16(swapendian_int16(opcodes.r16(pc)))); @@ -150,6 +167,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 util::stream_format(stream, "invalid(0x%02x)", n); else { + // Byte displacement or displacement deferred if (BIT(n, 4)) stream << "*"; format_signed(stream, s8(opcodes.r8(pc++))); @@ -160,6 +178,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 case 0xe0: if (n == 0xef) { + // Absolute deferred util::stream_format(stream, "*$0x%08x", swapendian_int32(opcodes.r32(pc))); pc += 4; } @@ -167,6 +186,7 @@ void we32100_disassembler::dasm_am(std::ostream &stream, offs_t &pc, const we321 util::stream_format(stream, "reserved(0x%02x)", n); else { + // Expanded operand type if (!BIT(n, 1)) util::stream_format(stream, "{%cword}", BIT(n, 2) ? 's' : 'u'); else if (!BIT(n, 0)) @@ -210,11 +230,36 @@ void we32100_disassembler::dasm_dstw(std::ostream &stream, offs_t &pc, const we3 util::stream_format(stream, "invalid(0x%02x)", n); } -void we32100_disassembler::dasm_ea(std::ostream &stream, offs_t &pc, const we32100_disassembler::data_buffer &opcodes) +void we32100_disassembler::dasm_ea(std::ostream &stream, offs_t &pc, offs_t ppc, const we32100_disassembler::data_buffer &opcodes) { u8 n = opcodes.r8(pc++); if (n >= 0x50 && (n < 0xe0 || n == 0xef) && n != 0x5f && n != 0x6f) - dasm_am(stream, pc, opcodes, n, false); + { + if ((n & 0x8f) == 0x8f && n != 0xef) + { + if (BIT(n, 4)) + stream << "*"; + + // Show calculated PC-relative displacement + s32 disp; + if (BIT(n, 6)) + disp = s8(opcodes.r8(pc++)); + else if (BIT(n, 5)) + { + disp = s16(swapendian_int16(opcodes.r16(pc))); + pc += 2; + } + else + { + disp = s32(swapendian_int32(opcodes.r32(pc))); + pc += 4; + } + format_signed(stream, disp); + util::stream_format(stream, "(%%%s) <%x>", s_rnames[15], u32(ppc + disp)); + } + else + dasm_am(stream, pc, opcodes, n, false); + } else util::stream_format(stream, "invalid(0x%02x)", n); } @@ -332,7 +377,7 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const if (!BIT(op, 1)) { util::stream_format(stream, "%-8s", "MOVAW"); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); stream << ","; dasm_dst(stream, pc, opcodes); } @@ -399,7 +444,7 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const case 0x1c: util::stream_format(stream, "%-8s", util::string_format("SWAP%cI", "W?HB"[op & 0x03])); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); break; case 0x20: @@ -428,7 +473,7 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const if (!BIT(op, 1)) { util::stream_format(stream, "%-8s", "JMP"); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); } else stream << "CFLUSH"; @@ -443,9 +488,9 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const if (!BIT(op, 1)) { util::stream_format(stream, "%-8s", "CALL"); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); stream << ","; - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); flags |= STEP_OVER; } else if (!BIT(op, 0)) @@ -479,7 +524,7 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const if (!BIT(op, 1)) { util::stream_format(stream, "%-8s", "JSB"); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); } else { @@ -851,7 +896,7 @@ offs_t we32100_disassembler::disassemble(std::ostream &stream, offs_t pc, const case 0xe0: util::stream_format(stream, "%-8s", "PUSHAW"); - dasm_ea(stream, pc, opcodes); + dasm_ea(stream, pc, ppc, opcodes); break; } |