diff options
Diffstat (limited to 'src/devices/cpu/sm510/sm510d.cpp')
-rw-r--r-- | src/devices/cpu/sm510/sm510d.cpp | 103 |
1 files changed, 35 insertions, 68 deletions
diff --git a/src/devices/cpu/sm510/sm510d.cpp b/src/devices/cpu/sm510/sm510d.cpp index 5f107babd4c..2525d5a3670 100644 --- a/src/devices/cpu/sm510/sm510d.cpp +++ b/src/devices/cpu/sm510/sm510d.cpp @@ -9,6 +9,40 @@ #include "emu.h" #include "sm510d.h" +// constructor + +sm510_common_disassembler::sm510_common_disassembler() +{ + // init 6-bit lfsr pc lut + for (u32 i = 0, pc = 0; i < 0x3f; i++) + { + m_l2r6[i] = pc; + m_r2l6[pc] = i; + pc = increment_pc(pc, 6); + } + + m_l2r6[0x3f] = 0x3f; + m_r2l6[0x3f] = 0x3f; + + // init 7-bit lfsr pc lut + for (u32 i = 0, pc = 0; i < 0x7f; i++) + { + m_l2r7[i] = pc; + m_r2l7[pc] = i; + pc = increment_pc(pc, 7); + } + + m_l2r7[0x7f] = 0x7f; + m_r2l7[0x7f] = 0x7f; +} + +offs_t sm510_common_disassembler::increment_pc(offs_t pc, u8 pclen) +{ + u32 feed = ((pc >> 1 ^ pc) & 1) ? 0 : (1 << (pclen - 1)); + u32 mask = (1 << pclen) - 1; + return feed | (pc >> 1 & (mask >> 1)) | (pc & ~mask); +} + // common lookup tables @@ -127,18 +161,7 @@ offs_t sm510_common_disassembler::common_disasm(const u8 *lut_mnemonic, const u8 u16 param = mask; if (bits >= 8) { - if (pclen == 6) - { - int feed = ((pc >> 1 ^ pc) & 1) ? 0 : 0x20; - pc = feed | (pc >> 1 & 0x1f) | (pc & ~0x3f); - } - else if (pclen == 7) - { - int feed = ((pc >> 1 ^ pc) & 1) ? 0 : 0x40; - pc = feed | (pc >> 1 & 0x3f) | (pc & ~0x7f); - } - else - abort(); + pc = increment_pc(pc, pclen); param = params.r8(pc); len++; } @@ -391,63 +414,7 @@ const u8 sm590_disassembler::sm590_mnemonic[0x100] = mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7, mTR7 // F }; - offs_t sm590_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) { return common_disasm(sm590_mnemonic, nullptr, stream, pc, opcodes, params, 7); } - - -// Sarayan's little helpers - -offs_t sm510_common_disassembler::pc_linear_to_real(offs_t pc) const -{ - static const u8 l2r[64] = { - 0x00, 0x20, 0x30, 0x38, 0x3c, 0x3e, 0x1f, 0x2f, 0x37, 0x3b, 0x3d, 0x1e, 0x0f, 0x27, 0x33, 0x39, - 0x1c, 0x2e, 0x17, 0x2b, 0x35, 0x1a, 0x0d, 0x06, 0x03, 0x21, 0x10, 0x28, 0x34, 0x3a, 0x1d, 0x0e, - 0x07, 0x23, 0x31, 0x18, 0x2c, 0x36, 0x1b, 0x2d, 0x16, 0x0b, 0x25, 0x12, 0x09, 0x04, 0x22, 0x11, - 0x08, 0x24, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x29, 0x14, 0x2a, 0x15, 0x0a, 0x05, 0x02, 0x01, 0x3f, - }; - return (pc & ~0x3f) | l2r[pc & 0x3f]; -} - -offs_t sm510_common_disassembler::pc_real_to_linear(offs_t pc) const -{ - static const u8 r2l[64] = { - 0x00, 0x3e, 0x3d, 0x18, 0x2d, 0x3c, 0x17, 0x20, 0x30, 0x2c, 0x3b, 0x29, 0x34, 0x16, 0x1f, 0x0c, - 0x1a, 0x2f, 0x2b, 0x36, 0x38, 0x3a, 0x28, 0x12, 0x23, 0x33, 0x15, 0x26, 0x10, 0x1e, 0x0b, 0x06, - 0x01, 0x19, 0x2e, 0x21, 0x31, 0x2a, 0x35, 0x0d, 0x1b, 0x37, 0x39, 0x13, 0x24, 0x27, 0x11, 0x07, - 0x02, 0x22, 0x32, 0x0e, 0x1c, 0x14, 0x25, 0x08, 0x03, 0x0f, 0x1d, 0x09, 0x04, 0x0a, 0x05, 0x3f, - }; - return (pc & ~0x3f) | r2l[pc & 0x3f]; -} - -offs_t sm590_disassembler::pc_linear_to_real(offs_t pc) const -{ - static const u8 l2r[128] = { - 0x00, 0x40, 0x60, 0x70, 0x78, 0x7c, 0x7e, 0x3f, 0x5f, 0x6f, 0x77, 0x7b, 0x7d, 0x3e, 0x1f, 0x4f, - 0x67, 0x73, 0x79, 0x3c, 0x5e, 0x2f, 0x57, 0x6b, 0x75, 0x3a, 0x1d, 0x0e, 0x07, 0x43, 0x61, 0x30, - 0x58, 0x6c, 0x76, 0x3b, 0x5d, 0x2e, 0x17, 0x4b, 0x65, 0x32, 0x19, 0x0c, 0x46, 0x23, 0x51, 0x28, - 0x54, 0x6a, 0x35, 0x1a, 0x0d, 0x06, 0x03, 0x41, 0x20, 0x50, 0x68, 0x74, 0x7a, 0x3d, 0x1e, 0x0f, - 0x47, 0x63, 0x71, 0x38, 0x5c, 0x6e, 0x37, 0x5b, 0x6d, 0x36, 0x1b, 0x4d, 0x26, 0x13, 0x49, 0x24, - 0x52, 0x29, 0x14, 0x4a, 0x25, 0x12, 0x09, 0x04, 0x42, 0x21, 0x10, 0x48, 0x64, 0x72, 0x39, 0x1c, - 0x4e, 0x27, 0x53, 0x69, 0x34, 0x5a, 0x2d, 0x16, 0x0b, 0x45, 0x22, 0x11, 0x08, 0x44, 0x62, 0x31, - 0x18, 0x4c, 0x66, 0x33, 0x59, 0x2c, 0x56, 0x2b, 0x55, 0x2a, 0x15, 0x0a, 0x05, 0x02, 0x01, 0x7f, - }; - return (pc & ~0x7f) | l2r[pc & 0x7f]; -} - -offs_t sm590_disassembler::pc_real_to_linear(offs_t pc) const -{ - static const u8 r2l[128] = { - 0x00, 0x7e, 0x7d, 0x36, 0x57, 0x7c, 0x35, 0x1c, 0x6c, 0x56, 0x7b, 0x68, 0x2b, 0x34, 0x1b, 0x3f, - 0x5a, 0x6b, 0x55, 0x4d, 0x52, 0x7a, 0x67, 0x26, 0x70, 0x2a, 0x33, 0x4a, 0x5f, 0x1a, 0x3e, 0x0e, - 0x38, 0x59, 0x6a, 0x2d, 0x4f, 0x54, 0x4c, 0x61, 0x2f, 0x51, 0x79, 0x77, 0x75, 0x66, 0x25, 0x15, - 0x1f, 0x6f, 0x29, 0x73, 0x64, 0x32, 0x49, 0x46, 0x43, 0x5e, 0x19, 0x23, 0x13, 0x3d, 0x0d, 0x07, - 0x01, 0x37, 0x58, 0x1d, 0x6d, 0x69, 0x2c, 0x40, 0x5b, 0x4e, 0x53, 0x27, 0x71, 0x4b, 0x60, 0x0f, - 0x39, 0x2e, 0x50, 0x62, 0x30, 0x78, 0x76, 0x16, 0x20, 0x74, 0x65, 0x47, 0x44, 0x24, 0x14, 0x08, - 0x02, 0x1e, 0x6e, 0x41, 0x5c, 0x28, 0x72, 0x10, 0x3a, 0x63, 0x31, 0x17, 0x21, 0x48, 0x45, 0x09, - 0x03, 0x42, 0x5d, 0x11, 0x3b, 0x18, 0x22, 0x0a, 0x04, 0x12, 0x3c, 0x0b, 0x05, 0x0c, 0x06, 0x7f, - }; - return (pc & ~0x7f) | r2l[pc & 0x7f]; -} |