diff options
Diffstat (limited to 'src/devices/cpu/ccpu/ccpu.c')
-rw-r--r-- | src/devices/cpu/ccpu/ccpu.c | 689 |
1 files changed, 689 insertions, 0 deletions
diff --git a/src/devices/cpu/ccpu/ccpu.c b/src/devices/cpu/ccpu/ccpu.c new file mode 100644 index 00000000000..e8893580f0c --- /dev/null +++ b/src/devices/cpu/ccpu/ccpu.c @@ -0,0 +1,689 @@ +// license:BSD-3-Clause +// copyright-holders:Aaron Giles +/*************************************************************************** + + ccpu.c + Core implementation for the portable Cinematronics CPU emulator. + + Written by Aaron Giles + Special thanks to Zonn Moore for his detailed documentation. + +***************************************************************************/ + +#include "emu.h" +#include "debugger.h" +#include "ccpu.h" + + +const device_type CCPU = &device_creator<ccpu_cpu_device>; + + +/*************************************************************************** + MACROS +***************************************************************************/ + +#define READOP(a) (m_direct->read_byte(a)) + +#define RDMEM(a) (m_data->read_word((a) * 2) & 0xfff) +#define WRMEM(a,v) (m_data->write_word((a) * 2, (v))) + +#define READPORT(a) (m_io->read_byte(a)) +#define WRITEPORT(a,v) (m_io->write_byte((a), (v))) + +#define SET_A0 do { m_a0flag = m_A; } while (0) +#define SET_CMP_VAL(x) do { m_cmpacc = *m_acc; m_cmpval = (x) & 0xfff; } while (0) +#define SET_NC(a) do { m_ncflag = ~(a); } while (0) +#define SET_MI(a) do { m_nextnextmiflag = (a); } while (0) + +#define TEST_A0 (m_a0flag & 1) +#define TEST_NC ((m_ncflag >> 12) & 1) +#define TEST_MI ((m_miflag >> 11) & 1) +#define TEST_LT (m_cmpval < m_cmpacc) +#define TEST_EQ (m_cmpval == m_cmpacc) +#define TEST_DR (m_drflag != 0) + +#define NEXT_ACC_A do { SET_MI(*m_acc); m_acc = &m_A; } while (0) +#define NEXT_ACC_B do { SET_MI(*m_acc); if (m_acc == &m_A) m_acc = &m_B; else m_acc = &m_A; } while (0) + +#define CYCLES(x) do { m_icount -= (x); } while (0) + +#define STANDARD_ACC_OP(resexp,cmpval) \ +do { \ + UINT16 result = resexp; \ + SET_A0; /* set the A0 bit based on the previous 'A' value */ \ + SET_CMP_VAL(cmpval); /* set the compare values to the previous accumulator and the cmpval */ \ + SET_NC(result); /* set the NC flag based on the unmasked result */ \ + *m_acc = result & 0xfff; /* store the low 12 bits of the new value */ \ +} while (0) + + + +/*************************************************************************** + INITIALIZATION AND SHUTDOWN +***************************************************************************/ + +ccpu_cpu_device::ccpu_cpu_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : cpu_device(mconfig, CCPU, "Cinematronics CPU", tag, owner, clock, "ccpu", __FILE__) + , m_program_config("program", ENDIANNESS_BIG, 8, 15, 0) + , m_data_config("data", ENDIANNESS_BIG, 16, 32, -1) + , m_io_config("io", ENDIANNESS_BIG, 8, 5, 0) + , m_external_input(*this) + , m_flags(0) +{ +} + + +READ8_MEMBER( ccpu_cpu_device::read_jmi ) +{ + /* this routine is called when there is no external input */ + /* and the JMI jumper is present */ + return TEST_MI; +} + + +void ccpu_cpu_device::wdt_timer_trigger() +{ + m_waiting = FALSE; + m_watchdog++; + if (m_watchdog >= 3) + m_PC = 0; +} + + +void ccpu_cpu_device::device_start() +{ + /* copy input params */ + m_external_input.resolve_safe(0); + m_vector_callback.bind_relative_to(*owner()); + assert(!m_vector_callback.isnull()); + + m_program = &space(AS_PROGRAM); + m_direct = &m_program->direct(); + m_data = &space(AS_DATA); + m_io = &space(AS_IO); + + save_item(NAME(m_PC)); + save_item(NAME(m_A)); + save_item(NAME(m_B)); + save_item(NAME(m_I)); + save_item(NAME(m_J)); + save_item(NAME(m_P)); + save_item(NAME(m_X)); + save_item(NAME(m_Y)); + save_item(NAME(m_T)); + save_item(NAME(m_a0flag)); + save_item(NAME(m_ncflag)); + save_item(NAME(m_cmpacc)); + save_item(NAME(m_cmpval)); + save_item(NAME(m_miflag)); + save_item(NAME(m_nextmiflag)); + save_item(NAME(m_nextnextmiflag)); + save_item(NAME(m_drflag)); + save_item(NAME(m_waiting)); + save_item(NAME(m_watchdog)); + + // Register state for debugger + state_add( CCPU_PC, "PC", m_PC).formatstr("%04X"); + state_add( CCPU_A, "A", m_A).mask(0xfff).formatstr("%03X"); + state_add( CCPU_B, "B", m_B).mask(0xfff).formatstr("%03X"); + state_add( CCPU_I, "I", m_I).mask(0xfff).formatstr("%03X"); + state_add( CCPU_J, "J", m_J).mask(0xfff).formatstr("%03X"); + state_add( CCPU_P, "P", m_P).mask(0xf).formatstr("%1X"); + state_add( CCPU_X, "X", m_X).mask(0xfff).formatstr("%03X"); + state_add( CCPU_Y, "Y", m_Y).mask(0xfff).formatstr("%03X"); + state_add( CCPU_T, "T", m_T).mask(0xfff).formatstr("%03X"); + state_add(STATE_GENPC, "curpc", m_PC).noshow(); + state_add(STATE_GENFLAGS, "GENFLAGS", m_flags).formatstr("%6s").noshow(); + + m_icountptr = &m_icount; +} + + +void ccpu_cpu_device::state_string_export(const device_state_entry &entry, std::string &str) +{ + switch (entry.index()) + { + case STATE_GENFLAGS: + strprintf(str, "%c%c%c%c%c%c", + TEST_A0 ? '0' : 'o', + TEST_NC ? 'N' : 'n', + TEST_LT ? 'L' : 'l', + TEST_EQ ? 'E' : 'e', + m_external_input() ? 'M' : 'm', + TEST_DR ? 'D' : 'd'); + break; + } +} + + +void ccpu_cpu_device::device_reset() +{ + /* zero registers */ + m_PC = 0; + m_A = 0; + m_B = 0; + m_I = 0; + m_J = 0; + m_P = 0; + m_X = 0; + m_Y = 0; + m_T = 0; + m_acc = &m_A; + + /* zero flags */ + m_a0flag = 0; + m_ncflag = 0; + m_cmpacc = 0; + m_cmpval = 1; + m_miflag = m_nextmiflag = m_nextnextmiflag = 0; + m_drflag = 0; + + m_waiting = FALSE; + m_watchdog = 0; +} + + + +/*************************************************************************** + CORE EXECUTION LOOP +***************************************************************************/ + +void ccpu_cpu_device::execute_run() +{ + if (m_waiting) + { + m_icount = 0; + return; + } + + do + { + UINT16 tempval; + UINT8 opcode; + + /* update the delayed MI flag */ + m_miflag = m_nextmiflag; + m_nextmiflag = m_nextnextmiflag; + + /* fetch the opcode */ + debugger_instruction_hook(this, m_PC); + opcode = READOP(m_PC++); + + switch (opcode) + { + /* LDAI */ + case 0x00: case 0x01: case 0x02: case 0x03: + case 0x04: case 0x05: case 0x06: case 0x07: + case 0x08: case 0x09: case 0x0a: case 0x0b: + case 0x0c: case 0x0d: case 0x0e: case 0x0f: + tempval = (opcode & 0x0f) << 8; + STANDARD_ACC_OP(tempval, tempval); + NEXT_ACC_A; CYCLES(1); + break; + + /* INP */ + case 0x10: case 0x11: case 0x12: case 0x13: + case 0x14: case 0x15: case 0x16: case 0x17: + case 0x18: case 0x19: case 0x1a: case 0x1b: + case 0x1c: case 0x1d: case 0x1e: case 0x1f: + if (m_acc == &m_A) + tempval = READPORT(opcode & 0x0f) & 1; + else + tempval = READPORT(16 + (opcode & 0x07)) & 1; + STANDARD_ACC_OP(tempval, tempval); + NEXT_ACC_A; CYCLES(1); + break; + + /* A8I */ + case 0x20: + tempval = READOP(m_PC++); + STANDARD_ACC_OP(*m_acc + tempval, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* A4I */ + case 0x21: case 0x22: case 0x23: + case 0x24: case 0x25: case 0x26: case 0x27: + case 0x28: case 0x29: case 0x2a: case 0x2b: + case 0x2c: case 0x2d: case 0x2e: case 0x2f: + tempval = opcode & 0x0f; + STANDARD_ACC_OP(*m_acc + tempval, tempval); + NEXT_ACC_A; CYCLES(1); + break; + + /* S8I */ + case 0x30: + tempval = READOP(m_PC++); + STANDARD_ACC_OP(*m_acc + (tempval ^ 0xfff) + 1, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* S4I */ + case 0x31: case 0x32: case 0x33: + case 0x34: case 0x35: case 0x36: case 0x37: + case 0x38: case 0x39: case 0x3a: case 0x3b: + case 0x3c: case 0x3d: case 0x3e: case 0x3f: + tempval = opcode & 0x0f; + STANDARD_ACC_OP(*m_acc + (tempval ^ 0xfff) + 1, tempval); + NEXT_ACC_A; CYCLES(1); + break; + + /* LPAI */ + case 0x40: case 0x41: case 0x42: case 0x43: + case 0x44: case 0x45: case 0x46: case 0x47: + case 0x48: case 0x49: case 0x4a: case 0x4b: + case 0x4c: case 0x4d: case 0x4e: case 0x4f: + tempval = READOP(m_PC++); + m_J = (opcode & 0x0f) + (tempval & 0xf0) + ((tempval & 0x0f) << 8); + NEXT_ACC_A; CYCLES(3); + break; + + /* T4K */ + case 0x50: + m_PC = (m_P << 12) + m_J; + NEXT_ACC_B; CYCLES(4); + break; + + /* JMIB/JEHB */ + case 0x51: + if (m_external_input()) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* JVNB */ + case 0x52: + if (TEST_DR) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* JLTB */ + case 0x53: + if (TEST_LT) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* JEQB */ + case 0x54: + if (TEST_EQ) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* JCZB */ + case 0x55: + if (TEST_NC) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* JOSB */ + case 0x56: + if (TEST_A0) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_B; CYCLES(2); + break; + + /* SSA */ + case 0x57: + NEXT_ACC_B; CYCLES(2); + break; + + /* JMP */ + case 0x58: + m_PC = ((m_PC - 1) & 0xf000) + m_J; + NEXT_ACC_A; CYCLES(4); + break; + + /* JMI/JEH */ + case 0x59: + if (m_external_input()) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* JVN */ + case 0x5a: + if (TEST_DR) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* JLT */ + case 0x5b: + if (TEST_LT) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* JEQ */ + case 0x5c: + if (TEST_EQ) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* JCZ */ + case 0x5d: + if (TEST_NC) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* JOS */ + case 0x5e: + if (TEST_A0) { m_PC = ((m_PC - 1) & 0xf000) + m_J; CYCLES(2); } + NEXT_ACC_A; CYCLES(2); + break; + + /* NOP */ + case 0x5f: + NEXT_ACC_A; CYCLES(2); + break; + + /* ADD */ + case 0x60: case 0x61: case 0x62: case 0x63: + case 0x64: case 0x65: case 0x66: case 0x67: + case 0x68: case 0x69: case 0x6a: case 0x6b: + case 0x6c: case 0x6d: case 0x6e: case 0x6f: + m_I = (m_P << 4) + (opcode & 0x0f); + tempval = RDMEM(m_I); + STANDARD_ACC_OP(*m_acc + tempval, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* SUB */ + case 0x70: case 0x71: case 0x72: case 0x73: + case 0x74: case 0x75: case 0x76: case 0x77: + case 0x78: case 0x79: case 0x7a: case 0x7b: + case 0x7c: case 0x7d: case 0x7e: case 0x7f: + m_I = (m_P << 4) + (opcode & 0x0f); + tempval = RDMEM(m_I); + STANDARD_ACC_OP(*m_acc + (tempval ^ 0xfff) + 1, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* SETP */ + case 0x80: case 0x81: case 0x82: case 0x83: + case 0x84: case 0x85: case 0x86: case 0x87: + case 0x88: case 0x89: case 0x8a: case 0x8b: + case 0x8c: case 0x8d: case 0x8e: case 0x8f: + m_P = opcode & 0x0f; + NEXT_ACC_A; CYCLES(1); + break; + + /* OUT */ + case 0x90: case 0x91: case 0x92: case 0x93: + case 0x94: case 0x95: case 0x96: case 0x97: + case 0x98: case 0x99: case 0x9a: case 0x9b: + case 0x9c: case 0x9d: case 0x9e: case 0x9f: + if (m_acc == &m_A) + WRITEPORT(opcode & 0x07, ~*m_acc & 1); + NEXT_ACC_A; CYCLES(1); + break; + + /* LDA */ + case 0xa0: case 0xa1: case 0xa2: case 0xa3: + case 0xa4: case 0xa5: case 0xa6: case 0xa7: + case 0xa8: case 0xa9: case 0xaa: case 0xab: + case 0xac: case 0xad: case 0xae: case 0xaf: + m_I = (m_P << 4) + (opcode & 0x0f); + tempval = RDMEM(m_I); + STANDARD_ACC_OP(tempval, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* TST */ + case 0xb0: case 0xb1: case 0xb2: case 0xb3: + case 0xb4: case 0xb5: case 0xb6: case 0xb7: + case 0xb8: case 0xb9: case 0xba: case 0xbb: + case 0xbc: case 0xbd: case 0xbe: case 0xbf: + m_I = (m_P << 4) + (opcode & 0x0f); + tempval = RDMEM(m_I); + { + UINT16 result = *m_acc + (tempval ^ 0xfff) + 1; + SET_A0; + SET_CMP_VAL(tempval); + SET_NC(result); + SET_MI(result); + } + NEXT_ACC_A; CYCLES(3); + break; + + /* WS */ + case 0xc0: case 0xc1: case 0xc2: case 0xc3: + case 0xc4: case 0xc5: case 0xc6: case 0xc7: + case 0xc8: case 0xc9: case 0xca: case 0xcb: + case 0xcc: case 0xcd: case 0xce: case 0xcf: + m_I = (m_P << 4) + (opcode & 0x0f); + m_I = RDMEM(m_I) & 0xff; + NEXT_ACC_A; CYCLES(3); + break; + + /* STA */ + case 0xd0: case 0xd1: case 0xd2: case 0xd3: + case 0xd4: case 0xd5: case 0xd6: case 0xd7: + case 0xd8: case 0xd9: case 0xda: case 0xdb: + case 0xdc: case 0xdd: case 0xde: case 0xdf: + m_I = (m_P << 4) + (opcode & 0x0f); + WRMEM(m_I, *m_acc); + NEXT_ACC_A; CYCLES(3); + break; + + /* DV */ + case 0xe0: + { + INT16 stopX = (INT16)(m_A << 4) >> 4; + INT16 stopY = (INT16)(m_B << 4) >> 4; + + stopX = ((INT16)(stopX - m_X) >> m_T) + m_X; + stopY = ((INT16)(stopY - m_Y) >> m_T) + m_Y; + + m_vector_callback(m_X, m_Y, stopX, stopY, m_T); + + /* hack to make QB3 display semi-correctly during explosions */ + m_A = m_X & 0xfff; + m_B = m_Y & 0xfff; + } + NEXT_ACC_A; CYCLES(1); + break; + + /* LPAP */ + case 0xe1: + m_J = RDMEM(m_I); + NEXT_ACC_A; CYCLES(3); + break; + + /* WSP */ + case 0xf1: + m_I = RDMEM(m_I) & 0xff; + NEXT_ACC_A; CYCLES(3); + break; + + /* LKP */ + case 0xe2: + case 0xf2: + tempval = READOP(((m_PC - 1) & 0xf000) + *m_acc); + STANDARD_ACC_OP(tempval, tempval); + NEXT_ACC_A; CYCLES(7); + m_PC++; + break; + + /* MUL */ + case 0xe3: + case 0xf3: + tempval = RDMEM(m_I); + SET_A0; + m_cmpval = tempval & 0xfff; + if (m_acc == &m_A) + { + if (m_A & 1) + { + UINT16 result; + m_cmpacc = m_B; + m_A = (m_A >> 1) | ((m_B << 11) & 0x800); + m_B = ((INT16)(m_B << 4) >> 5) & 0xfff; + result = m_B + tempval; + SET_NC(result); + SET_MI(result); + m_B = result & 0xfff; + } + else + { + UINT16 result; + m_cmpacc = m_A; + result = m_A + tempval; + m_A = (m_A >> 1) | ((m_B << 11) & 0x800); + m_B = ((INT16)(m_B << 4) >> 5) & 0xfff; + SET_NC(result); + SET_MI(result); + } + } + else + { + UINT16 result; + m_cmpacc = m_B; + m_B = ((INT16)(m_B << 4) >> 5) & 0xfff; + result = m_B + tempval; + SET_NC(result); + SET_MI(result); + if (m_A & 1) + m_B = result & 0xfff; + } + NEXT_ACC_A; CYCLES(2); + break; + + /* NV */ + case 0xe4: + case 0xf4: + m_T = 0; + while (((m_A & 0xa00) == 0x000 || (m_A & 0xa00) == 0xa00) && + ((m_B & 0xa00) == 0x000 || (m_B & 0xa00) == 0xa00) && + m_T < 16) + { + m_A = (m_A << 1) & 0xfff; + m_B = (m_B << 1) & 0xfff; + m_T++; + CYCLES(1); + } + NEXT_ACC_A; CYCLES(1); + break; + + /* FRM */ + case 0xe5: + case 0xf5: + m_waiting = TRUE; + NEXT_ACC_A; + m_icount = -1; + + /* some games repeat the FRM opcode twice; it apparently does not cause + a second wait, so we make sure we skip any duplicate opcode at this + point */ + if (READOP(m_PC) == opcode) + m_PC++; + break; + + /* STAP */ + case 0xe6: + case 0xf6: + WRMEM(m_I, *m_acc); + NEXT_ACC_A; CYCLES(2); + break; + + /* CST */ + case 0xf7: + m_watchdog = 0; + /* ADDP */ + case 0xe7: + tempval = RDMEM(m_I); + STANDARD_ACC_OP(*m_acc + tempval, tempval); + NEXT_ACC_A; CYCLES(2); + break; + + /* SUBP */ + case 0xe8: + case 0xf8: + tempval = RDMEM(m_I); + STANDARD_ACC_OP(*m_acc + (tempval ^ 0xfff) + 1, tempval); + NEXT_ACC_A; CYCLES(3); + break; + + /* ANDP */ + case 0xe9: + case 0xf9: + tempval = RDMEM(m_I); + STANDARD_ACC_OP(*m_acc & tempval, tempval); + NEXT_ACC_A; CYCLES(2); + break; + + /* LDAP */ + case 0xea: + case 0xfa: + tempval = RDMEM(m_I); + STANDARD_ACC_OP(tempval, tempval); + NEXT_ACC_A; CYCLES(2); + break; + + /* SHR */ + case 0xeb: + case 0xfb: + tempval = ((m_acc == &m_A) ? (m_A >> 1) : ((INT16)(m_B << 4) >> 5)) & 0xfff; + tempval |= (*m_acc + (0xb0b | (opcode & 0xf0))) & 0x1000; + STANDARD_ACC_OP(tempval, 0xb0b | (opcode & 0xf0)); + NEXT_ACC_A; CYCLES(1); + break; + + /* SHL */ + case 0xec: + case 0xfc: + tempval = (*m_acc << 1) & 0xfff; + tempval |= (*m_acc + (0xc0c | (opcode & 0xf0))) & 0x1000; + STANDARD_ACC_OP(tempval, 0xc0c | (opcode & 0xf0)); + NEXT_ACC_A; CYCLES(1); + break; + + /* ASR */ + case 0xed: + case 0xfd: + tempval = ((INT16)(*m_acc << 4) >> 5) & 0xfff; + STANDARD_ACC_OP(tempval, 0xd0d | (opcode & 0xf0)); + NEXT_ACC_A; CYCLES(1); + break; + + /* SHRB */ + case 0xee: + case 0xfe: + if (m_acc == &m_A) + { + tempval = (m_A >> 1) | ((m_B << 11) & 0x800); + m_B = ((INT16)(m_B << 4) >> 5) & 0xfff; + } + else + tempval = ((INT16)(m_B << 4) >> 5) & 0xfff; + tempval |= (*m_acc + (0xe0e | (opcode & 0xf0))) & 0x1000; + STANDARD_ACC_OP(tempval, 0xe0e | (opcode & 0xf0)); + NEXT_ACC_A; CYCLES(1); + break; + + /* SHLB */ + case 0xef: + case 0xff: + if (m_acc == &m_A) + { + tempval = (m_A << 1) & 0xfff; + m_B = (m_B << 1) & 0xfff; + } + else + tempval = (m_B << 1) & 0xfff; + tempval |= (*m_acc + (0xf0f | (opcode & 0xf0))) & 0x1000; + STANDARD_ACC_OP(tempval, 0xf0f | (opcode & 0xf0)); + NEXT_ACC_A; CYCLES(1); + break; + + /* IV */ + case 0xf0: + m_X = (INT16)(m_A << 4) >> 4; + m_Y = (INT16)(m_B << 4) >> 4; + NEXT_ACC_A; CYCLES(1); + break; + } + } while (m_icount > 0); +} + + +offs_t ccpu_cpu_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options) +{ + extern CPU_DISASSEMBLE( ccpu ); + return CPU_DISASSEMBLE_NAME(ccpu)(this, buffer, pc, oprom, opram, options); +} |