diff options
Diffstat (limited to 'src/devices/cpu/tms1000/tms1k_dasm.cpp')
-rw-r--r-- | src/devices/cpu/tms1000/tms1k_dasm.cpp | 143 |
1 files changed, 59 insertions, 84 deletions
diff --git a/src/devices/cpu/tms1000/tms1k_dasm.cpp b/src/devices/cpu/tms1000/tms1k_dasm.cpp index 1cd05a57ab3..af1af973697 100644 --- a/src/devices/cpu/tms1000/tms1k_dasm.cpp +++ b/src/devices/cpu/tms1000/tms1k_dasm.cpp @@ -9,6 +9,65 @@ #include "emu.h" #include "tms1k_dasm.h" +// constructor + +tms1000_base_disassembler::tms1000_base_disassembler(const u8 *lut_mnemonic, bool opcode_9bits, int pc_bits) : + m_lut_mnemonic(lut_mnemonic), + m_opcode_9bits(opcode_9bits), + m_pc_bits(pc_bits) +{ + // init lfsr pc lut + const u32 len = 1 << pc_bits; + m_l2r = std::make_unique<u8[]>(len); + m_r2l = std::make_unique<u8[]>(len); + + for (u32 i = 0, pc = 0; i < len; i++) + { + m_l2r[i] = pc; + m_r2l[pc] = i; + + // see tms1k_base_device::next_pc() + u32 mask = (1 << pc_bits) - 1; + u32 high = 1 << (pc_bits - 1); + u32 fb = (pc << 1 & high) == (pc & high); + + if (pc == (mask >> 1)) + fb = 1; + else if (pc == mask) + fb = 0; + + pc = (pc << 1 | fb) & mask; + } +} + +tms1000_disassembler::tms1000_disassembler() : tms1000_base_disassembler(tms1000_mnemonic, false, 6) +{ } + +tms1100_disassembler::tms1100_disassembler() : tms1000_base_disassembler(tms1100_mnemonic, false, 6) +{ } + +tms0980_disassembler::tms0980_disassembler() : tms1000_base_disassembler(tms0980_mnemonic, true, 7) +{ } + +tp0320_disassembler::tp0320_disassembler() : tms1000_base_disassembler(tp0320_mnemonic, true, 7) +{ } + + +offs_t tms1000_base_disassembler::pc_linear_to_real(offs_t pc) const +{ + const u32 mask = (1 << m_pc_bits) - 1; + return (pc & ~mask) | m_l2r[pc & mask]; +} + +offs_t tms1000_base_disassembler::pc_real_to_linear(offs_t pc) const +{ + const u32 mask = (1 << m_pc_bits) - 1; + return (pc & ~mask) | m_r2l[pc & mask]; +} + + +// common lookup tables + const char *const tms1000_base_disassembler::s_mnemonic[] = { "?", @@ -46,7 +105,6 @@ const u8 tms1000_base_disassembler::s_addressing[] = }; - // opcode luts const u8 tms1000_disassembler::tms1000_mnemonic[256] = @@ -72,7 +130,6 @@ const u8 tms1000_disassembler::tms1000_mnemonic[256] = /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */ }; - const u8 tms1100_disassembler::tms1100_mnemonic[256] = { /* 0x00 */ @@ -96,7 +153,6 @@ const u8 tms1100_disassembler::tms1100_mnemonic[256] = /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */ }; - const u8 tms0980_disassembler::tms0980_mnemonic[512] = { /* 0x000 */ @@ -138,7 +194,6 @@ const u8 tms0980_disassembler::tms0980_mnemonic[512] = /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */ }; - const u8 tp0320_disassembler::tp0320_mnemonic[512] = { /* 0x000 */ @@ -181,7 +236,6 @@ const u8 tp0320_disassembler::tp0320_mnemonic[512] = }; - // disasm const u8 tms1000_base_disassembler::i2_value[4] = @@ -227,82 +281,3 @@ offs_t tms1000_base_disassembler::disassemble(std::ostream &stream, offs_t pc, c return 1 | s_flags[instr] | SUPPORTED; } - -tms1000_disassembler::tms1000_disassembler() : tms1000_base_disassembler(tms1000_mnemonic, false, 6) -{ -} - -tms1100_disassembler::tms1100_disassembler() : tms1000_base_disassembler(tms1100_mnemonic, false, 6) -{ -} - -tms0980_disassembler::tms0980_disassembler() : tms1000_base_disassembler(tms0980_mnemonic, true, 7) -{ -} - -tp0320_disassembler::tp0320_disassembler() : tms1000_base_disassembler(tp0320_mnemonic, true, 7) -{ -} - -tms1000_base_disassembler::tms1000_base_disassembler(const u8 *lut_mnemonic, bool opcode_9bits, int pc_bits) : m_lut_mnemonic(lut_mnemonic), m_opcode_9bits(opcode_9bits), m_pc_bits(pc_bits) -{ -} - -offs_t tms1000_base_disassembler::pc_linear_to_real(offs_t pc) const -{ - switch(m_pc_bits) { - case 6: { - static const u8 l2r6[64] = { - 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x3e, 0x3d, 0x3b, 0x37, 0x2f, 0x1e, 0x3c, 0x39, 0x33, - 0x27, 0x0e, 0x1d, 0x3a, 0x35, 0x2b, 0x16, 0x2c, 0x18, 0x30, 0x21, 0x02, 0x05, 0x0b, 0x17, 0x2e, - 0x1c, 0x38, 0x31, 0x23, 0x06, 0x0d, 0x1b, 0x36, 0x2d, 0x1a, 0x34, 0x29, 0x12, 0x24, 0x08, 0x11, - 0x22, 0x04, 0x09, 0x13, 0x26, 0x0c, 0x19, 0x32, 0x25, 0x0a, 0x15, 0x2a, 0x14, 0x28, 0x10, 0x20, - }; - return (pc & ~0x3f) | l2r6[pc & 0x3f]; - } - case 7: { - static const u8 l2r7[128] = { - 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0x7e, 0x7d, 0x7b, 0x77, 0x6f, 0x5f, 0x3e, 0x7c, - 0x79, 0x73, 0x67, 0x4f, 0x1e, 0x3d, 0x7a, 0x75, 0x6b, 0x57, 0x2e, 0x5c, 0x38, 0x70, 0x61, 0x43, - 0x06, 0x0d, 0x1b, 0x37, 0x6e, 0x5d, 0x3a, 0x74, 0x69, 0x53, 0x26, 0x4c, 0x18, 0x31, 0x62, 0x45, - 0x0a, 0x15, 0x2b, 0x56, 0x2c, 0x58, 0x30, 0x60, 0x41, 0x02, 0x05, 0x0b, 0x17, 0x2f, 0x5e, 0x3c, - 0x78, 0x71, 0x63, 0x47, 0x0e, 0x1d, 0x3b, 0x76, 0x6d, 0x5b, 0x36, 0x6c, 0x59, 0x32, 0x64, 0x49, - 0x12, 0x25, 0x4a, 0x14, 0x29, 0x52, 0x24, 0x48, 0x10, 0x21, 0x42, 0x04, 0x09, 0x13, 0x27, 0x4e, - 0x1c, 0x39, 0x72, 0x65, 0x4b, 0x16, 0x2d, 0x5a, 0x34, 0x68, 0x51, 0x22, 0x44, 0x08, 0x11, 0x23, - 0x46, 0x0c, 0x19, 0x33, 0x66, 0x4d, 0x1a, 0x35, 0x6a, 0x55, 0x2a, 0x54, 0x28, 0x50, 0x20, 0x40, - }; - return (pc & ~0x7f) | l2r7[pc & 0x7f]; - } - } - return 0; -} - -offs_t tms1000_base_disassembler::pc_real_to_linear(offs_t pc) const -{ - switch(m_pc_bits) { - case 6: { - static const u8 r2l6[64] = { - 0x00, 0x01, 0x1b, 0x02, 0x31, 0x1c, 0x24, 0x03, 0x2e, 0x32, 0x39, 0x1d, 0x35, 0x25, 0x11, 0x04, - 0x3e, 0x2f, 0x2c, 0x33, 0x3c, 0x3a, 0x16, 0x1e, 0x18, 0x36, 0x29, 0x26, 0x20, 0x12, 0x0c, 0x05, - 0x3f, 0x1a, 0x30, 0x23, 0x2d, 0x38, 0x34, 0x10, 0x3d, 0x2b, 0x3b, 0x15, 0x17, 0x28, 0x1f, 0x0b, - 0x19, 0x22, 0x37, 0x0f, 0x2a, 0x14, 0x27, 0x0a, 0x21, 0x0e, 0x13, 0x09, 0x0d, 0x08, 0x07, 0x06, - }; - return (pc & ~0x3f) | r2l6[pc & 0x3f]; - } - case 7: { - static const u8 r2l7[128] = { - 0x00, 0x01, 0x39, 0x02, 0x5b, 0x3a, 0x20, 0x03, 0x6d, 0x5c, 0x30, 0x3b, 0x71, 0x21, 0x44, 0x04, - 0x58, 0x6e, 0x50, 0x5d, 0x53, 0x31, 0x65, 0x3c, 0x2c, 0x72, 0x76, 0x22, 0x60, 0x45, 0x14, 0x05, - 0x7e, 0x59, 0x6b, 0x6f, 0x56, 0x51, 0x2a, 0x5e, 0x7c, 0x54, 0x7a, 0x32, 0x34, 0x66, 0x1a, 0x3d, - 0x36, 0x2d, 0x4d, 0x73, 0x68, 0x77, 0x4a, 0x23, 0x1c, 0x61, 0x26, 0x46, 0x3f, 0x15, 0x0e, 0x06, - 0x7f, 0x38, 0x5a, 0x1f, 0x6c, 0x2f, 0x70, 0x43, 0x57, 0x4f, 0x52, 0x64, 0x2b, 0x75, 0x5f, 0x13, - 0x7d, 0x6a, 0x55, 0x29, 0x7b, 0x79, 0x33, 0x19, 0x35, 0x4c, 0x67, 0x49, 0x1b, 0x25, 0x3e, 0x0d, - 0x37, 0x1e, 0x2e, 0x42, 0x4e, 0x63, 0x74, 0x12, 0x69, 0x28, 0x78, 0x18, 0x4b, 0x48, 0x24, 0x0c, - 0x1d, 0x41, 0x62, 0x11, 0x27, 0x17, 0x47, 0x0b, 0x40, 0x10, 0x16, 0x0a, 0x0f, 0x09, 0x08, 0x07, - }; - return (pc & ~0x7f) | r2l7[pc & 0x7f]; - } - } - return 0; -} - |