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// license:BSD-3-Clause
// copyright-holders:F. Ulivi
// ********************************************************************************
// * HP Capricorn processor disassembler
// ********************************************************************************
#include "emu.h"
#include "capricorn_dasm.h"
void capricorn_disassembler::direct_addr(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
util::stream_format(stream, "$%04x", opcodes.r16(pc));
}
offs_t capricorn_disassembler::param_arp_drp(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
stream << "R";
util::stream_format(stream, "%02o", opcodes.r8(pc) & 0x3f);
return 0;
}
offs_t capricorn_disassembler::param_dr(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
stream << "DR";
return 0;
}
offs_t capricorn_disassembler::param_dr_ar(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
stream << "DR,AR";
return 0;
}
offs_t capricorn_disassembler::param_dr_lit(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
stream << "DR,=";
// Here we assume that multi-byte instructions operate on 2 bytes because we
// have no way of knowing how many they are (the actual number of bytes is
// dynamically determined by the value of DRP register at run-time)
unsigned bytes = BIT(opcodes.r8(pc), 0) ? 2 : 1;
for (unsigned i = 1; i <= bytes; i++) {
util::stream_format(stream, "$%02x ", opcodes.r8(pc+i));
}
return bytes;
}
offs_t capricorn_disassembler::param_dr_lit_dir(std::ostream &stream, offs_t pc,const data_buffer &opcodes)
{
stream << "DR,=";
direct_addr(stream, pc+1, opcodes);
return 2;
}
offs_t capricorn_disassembler::param_dr_idx_dir(std::ostream &stream, offs_t pc,const data_buffer &opcodes)
{
stream << "DR,XAR,";
direct_addr(stream, pc+1, opcodes);
return 2;
}
offs_t capricorn_disassembler::param_xr_lit(std::ostream &stream, offs_t pc,const data_buffer &opcodes)
{
stream << "XR,";
direct_addr(stream, pc+1, opcodes);
return 2;
}
offs_t capricorn_disassembler::param_lit_dir(std::ostream &stream, offs_t pc,const data_buffer &opcodes)
{
stream << "=";
direct_addr(stream, pc+1, opcodes);
return 2;
}
offs_t capricorn_disassembler::param_dr_id_ar(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
stream << "DR," << (BIT(opcodes.r8(pc), 1) ? '-' : '+') << "AR";
return 0;
}
offs_t capricorn_disassembler::param_jmp_off(std::ostream &stream, offs_t pc, const data_buffer &opcodes)
{
uint16_t off = opcodes.r8(pc+1);
if (BIT(off, 7)) {
off -= 0x100;
}
util::stream_format(stream, "$%04x", (pc + 2 + off) & 0xffff);
return 1;
}
const capricorn_disassembler::dis_entry_t capricorn_disassembler::dis_table[] = {
{ 0xff, 0x01, "ARP R*", false, '\0', nullptr, 0 },
{ 0xc0, 0x00, "ARP" , false, '\0', &capricorn_disassembler::param_arp_drp, 0 },
{ 0xff, 0x41, "DRP R*", false, '\0', nullptr, 0 },
{ 0xc0, 0x40, "DRP" , false, '\0', &capricorn_disassembler::param_arp_drp, 0 },
{ 0xfe, 0x80, "EL" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x82, "ER" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x84, "LL" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x86, "LR" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x88, "IC" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x8a, "DC" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x8c, "TC" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x8e, "NC" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x90, "TS" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x92, "CL" , true , '\0', &capricorn_disassembler::param_dr, 0 },
{ 0xfe, 0x94, "OR" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0x96, "XR" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xff, 0x98, "BIN" , false, '\0', nullptr, 0 },
{ 0xff, 0x99, "BCD" , false, '\0', nullptr, 0 },
{ 0xff, 0x9a, "SAD" , false, '\0', nullptr, 0 },
{ 0xff, 0x9b, "DCE" , false, '\0', nullptr, 0 },
{ 0xff, 0x9c, "ICE" , false, '\0', nullptr, 0 },
{ 0xff, 0x9d, "CLE" , false, '\0', nullptr, 0 },
{ 0xff, 0x9e, "RTN" , false, '\0', nullptr, STEP_OUT },
{ 0xff, 0x9f, "PAD" , false, '\0', nullptr, 0 },
{ 0xfe, 0xa0, "LD" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xa2, "ST" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xa4, "LD" , true , 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xa6, "ST" , true , 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xa8, "LD" , true , '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xfe, 0xaa, "ST" , true , '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xfe, 0xac, "LD" , true , 'I' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xae, "ST" , true , 'I' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xb0, "LD" , true , 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xb2, "ST" , true , 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xb4, "LD" , true , 'D' , &capricorn_disassembler::param_dr_idx_dir, 0 },
{ 0xfe, 0xb6, "ST" , true , 'D' , &capricorn_disassembler::param_dr_idx_dir, 0 },
{ 0xfe, 0xb8, "LD" , true , 'I' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xba, "ST" , true , 'I' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xbc, "LD" , true , 'I' , &capricorn_disassembler::param_dr_idx_dir, 0 },
{ 0xfe, 0xbe, "ST" , true , 'I' , &capricorn_disassembler::param_dr_idx_dir, 0 },
{ 0xfe, 0xc0, "CM" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xc2, "AD" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xc4, "SB" , true , '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xff, 0xc6, "JSB" , false, '\0', &capricorn_disassembler::param_xr_lit, STEP_OVER },
{ 0xff, 0xc7, "ANM" , false, '\0', &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xc8, "CM" , true , '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xfe, 0xca, "AD" , true , '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xfe, 0xcc, "SB" , true , '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xff, 0xce, "JSB" , false, '\0', &capricorn_disassembler::param_lit_dir, STEP_OVER },
{ 0xff, 0xcf, "ANM" , false, '\0', &capricorn_disassembler::param_dr_lit, 0 },
{ 0xfe, 0xd0, "CM" , true , 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xd2, "AD" , true , 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xd4, "SB" , true , 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xff, 0xd7, "ANM" , false, 'D' , &capricorn_disassembler::param_dr_lit_dir, 0 },
{ 0xfe, 0xd8, "CM" , true , 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xda, "AD" , true , 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfe, 0xdc, "SB" , true , 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xff, 0xdf, "ANM" , false, 'D' , &capricorn_disassembler::param_dr_ar, 0 },
{ 0xfc, 0xe0, "PO" , true , 'D' , &capricorn_disassembler::param_dr_id_ar, 0 },
{ 0xfc, 0xe4, "PU" , true , 'D' , &capricorn_disassembler::param_dr_id_ar, 0 },
{ 0xfc, 0xe8, "PO" , true , 'I' , &capricorn_disassembler::param_dr_id_ar, 0 },
{ 0xfc, 0xec, "PU" , true , 'I' , &capricorn_disassembler::param_dr_id_ar, 0 },
{ 0xff, 0xf0, "JMP" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf1, "JNO" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf2, "JOD" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf3, "JEV" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf4, "JNG" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf5, "JPS" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf6, "JNZ" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf7, "JZR" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf8, "JEN" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xf9, "JEZ" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xfa, "JNC" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xfb, "JCY" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xfc, "JLZ" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xfd, "JLN" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xfe, "JRZ" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
{ 0xff, 0xff, "JRN" , false, '\0', &capricorn_disassembler::param_jmp_off, 0 },
// *** END ***
{0, 0, nullptr, false, 0, nullptr, 0 }
};
u32 capricorn_disassembler::opcode_alignment() const
{
return 1;
}
offs_t capricorn_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
const dis_entry_t *p;
uint8_t opcode = opcodes.r8(pc);
for (p = dis_table; p->m_op_mask; p++) {
if ((opcode & p->m_op_mask) == p->m_opcode) {
offs_t res = 1 | p->m_dasm_flags | SUPPORTED;
stream << p->m_mnemonic;
if (p->m_has_mb) {
stream << (BIT(opcode, 0) ? 'M' : 'B');
}
if (p->m_addr_mode != '\0') {
stream << p->m_addr_mode;
}
if (p->m_param_fn != nullptr) {
stream << " ";
res += (this->*(p->m_param_fn))(stream, pc, opcodes);
}
return res;
}
}
// Unknown opcode
stream << "???";
return 1 | SUPPORTED;
}
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