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// license:BSD-3-Clause
// copyright-holders:Andrei I. Holub
/***************************************************************************
KL1839VM1 disassembler
***************************************************************************/
#include "emu.h"
#include "kl1839vm1dasm.h"
static const std::string r_name(u8 id)
{
std::ostringstream ss;
switch (id)
{
case 0x0f: ss << "PC"; break;
case 0x14: ss << "AK0"; break;
case 0x15: ss << "AK1"; break;
case 0x16: ss << "AK2"; break;
case 0x12: ss << "AK3"; break;
case 0x11: ss << "AK4"; break;
case 0x13: ss << "AK5"; break;
case 0x17: ss << "AK6"; break;
case 0x18: ss << "AK7"; break;
case 0x10: ss << "AK8"; break;
case 0x1f: ss << "BO"; break;
default: util::stream_format(ss, "R(%02X)", id); break;
}
return ss.str();
}
static const std::string k_name(u8 id)
{
std::ostringstream ss;
switch (id)
{
case 0x05: ss << "PCM"; break;
case 0x06: ss << "RC"; break;
default: util::stream_format(ss, "K(%X)", id); break;
}
return ss.str();
}
static const void m_base(std::ostream &stream, u32 op, char m, u8 kop, std::string x, std::string y, std::string z)
{
const u8 fd = BIT(op, 28, 2);
const u8 ps = BIT(op, 13, 2);
const bool pd = BIT(op, 4);
util::stream_format(stream, "M%c%-2s :", m, "");
std::ostringstream ss;
switch(fd)
{
case 0b00: ss << "DS/"; break;
case 0b01: ss << "SL/"; break;
case 0b11: ss << "BT/"; break;
default: break; // 0b10
}
switch(kop)
{
case 0b0000: ss << y << "=>" << z; break;
case 0b0010: ss << x << "+" << y << "=>" << z; break;
case 0b0011: ss << x << "=>" << z; break;
case 0b0100: ss << x << "-" << y << "=>" << z; break;
case 0b0110: ss << y << "-" << x << "=>" << z; break;
case 0b0111: ss << x << "=>!" << x; break;
case 0b1000: ss << x << "(+)" << y << "=>" << z; break;
case 0b1001: ss << "AL" << x; break;
case 0b1010: ss << x << "'" << y << "=>" << z; break;
case 0b1011: ss << "CL" << x; break;
case 0b1100: ss << x << "&!" << y << "=>" << z; break;
case 0b1101: ss << "AP" << x; break;
case 0b1110: ss << x << "&" << y << "=>" << z; break;
case 0b1111: ss << "CP" << x; break;
default: break; // 0b0001, 0b0101 - reserved
}
util::stream_format(stream, "%-24s;", ss.str());
stream << (pd ? "PD " : "");
switch(ps)
{
case 0b00: stream << "ZS "; break;
case 0b01: stream << "MS "; break;
case 0b10: stream << "NV "; break;
default: break; // 0b11 - no state store
}
}
static const void ma(std::ostream &stream, u32 op)
{
const u8 kop1 = BIT(op, 24, 4);
const u8 am = BIT(op, 20, 4);
const u8 x = BIT(op, 15, 5);
const bool va = BIT(op, 12);
const u8 no = BIT(op, 10, 2);
const u8 fo = BIT(op, 8, 2);
const u8 kob = BIT(op, 5, 3);
const bool po = BIT(op, 3);
const bool py = BIT(op, 2);
const bool px = BIT(op, 1);
m_base(stream, op, 'A', kop1, px ? "RX" : r_name(x), py ? "RY" : k_name(am), px ? "RX" : r_name(x));
if (kob)
{
stream << (va ? "AZ " : "A4 ");
switch(no)
{
case 0b00: break;
case 0b01: stream << "PP "; break;
case 0b10: stream << "SR "; break;
case 0b11: stream << "SP "; break;
default: break;
}
switch(fo)
{
case 0b00: stream << "DSO "; break;
case 0b01: stream << "SLO "; break;
case 0b10: stream << "4SO "; break;
case 0b11: stream << "BO "; break;
default: break;
}
switch(kob)
{
case 0b000: break;
case 0b001: stream << "4D "; break;
case 0b010: stream << "ZD "; break;
case 0b011: stream << "4Z "; break;
case 0b100: stream << "WDAK "; break;
case 0b101: stream << "4K "; break;
case 0b110: break; // reserved
case 0b111: stream << "BRD "; break;
default: break;
}
}
if (po)
stream << "?:" << (po ? "RO" : "");
}
static const void mb(std::ostream &stream, u32 op)
{
const u8 kop2 = BIT(op, 25, 3);
const u8 y = BIT(op, 20, 5);
const u8 x = BIT(op, 15, 5);
const u8 ps = BIT(op, 13, 2);
const bool va = BIT(op, 12);
const u8 no = BIT(op, 10, 2);
const u8 fo = BIT(op, 8, 2);
const u8 kob = BIT(op, 5, 3);
const bool po = BIT(op, 3);
const bool py = BIT(op, 2);
const bool px = BIT(op, 1);
m_base(stream, op, 'B', kop2 << 1, px ? "RX" : r_name(x), py ? "RY" : r_name(y), px ? "RX" : r_name(x));
if (kob)
{
stream << (va ? "AZ " : "A4 ");
switch(ps)
{
case 0b00: stream << "ZS "; break;
case 0b01: stream << "MS "; break;
case 0b10: stream << "NV "; break;
default: break; // 0b11 - no state store
}
switch(no)
{
case 0b00: break;
case 0b01: stream << "PP "; break;
case 0b10: stream << "SR "; break;
case 0b11: stream << "SP "; break;
default: break;
}
switch(fo)
{
case 0b00: stream << "DSO "; break;
case 0b01: stream << "SLO "; break;
case 0b10: stream << "4SO "; break;
case 0b11: stream << "BO "; break;
default: break;
}
switch(kob)
{
case 0b000: break;
case 0b001: stream << "4D "; break;
case 0b010: stream << "ZD "; break;
case 0b011: stream << "4Z "; break;
case 0b100: stream << "WDAK "; break;
case 0b101: stream << "4K "; break;
case 0b110: break; // reserved
case 0b111: stream << "BRD "; break;
default: break;
}
}
if (po)
stream << "?:" << (po ? "RO" : "");
}
static const void mc(std::ostream &stream, u32 op)
{
const u8 kop2 = BIT(op, 25, 3);
const u8 y = BIT(op, 20, 5);
const u8 x = BIT(op, 15, 5);
const u8 z = BIT(op, 7, 5);
const bool pz = BIT(op, 3);
const bool py = BIT(op, 2);
const bool px = BIT(op, 1);
m_base(stream, op, 'C', kop2 << 1, px ? "RX" : r_name(x), kop2 ? (py ? "RY" : r_name(y)) : (px ? "RX" : r_name(x)), pz ? "RZ" : r_name(z));
}
static const u32 mk(std::ostream &stream, u32 op)
{
const bool ret = BIT(op, 17);
if ((op & 0xfe000000) == 0xe0000000)
{
if (BIT(~op, 16)) // madr == 0
{
const u16 addr = BIT(op, 2, 14);
util::stream_format(stream, "BP%s : ;A=(%04X)", ret ? " " : "B" , addr);
}
else
{
u16 addr_hi = BIT(op, 8, 8) << 6;
util::stream_format(stream, "BPV%s : ;A=(%04X+%s)", ret ? " " : "D" , addr_hi, r_name(0x18));
}
}
else if ((op & 0xfe000000) == 0xe2000000)
{
stream << "??MK-3";
}
return ret ? 0 : kl1839vm1_disassembler::STEP_OVER;
}
static const u32 yp(std::ostream &stream, u32 op)
{
const bool uv = BIT(op, 28);
const bool n = BIT(op, 27);
const bool z = BIT(op, 26);
const bool v = BIT(op, 25);
const bool c = BIT(op, 24);
const bool fp = BIT(op, 23);
const bool fpd = BIT(op, 22);
const bool prb = BIT(op, 21);
const bool rts = BIT(op, 20);
const bool rd = BIT(op, 19);
const bool ret = BIT(op, 17);
const bool js = BIT(op, 16);
const u16 addr = BIT(op, 2, 14);
if (fp)
{
util::stream_format(stream, "YPF%s : ", uv);
}
else if (fpd)
util::stream_format(stream, "YPFPD :", uv);
else
{
util::stream_format(stream, "YP%s%s :", uv , (js ? "JS" : " "));
stream << (n ? "N" : "");
stream << (z ? "Z" : "");
stream << (v ? "V" : "");
stream << (c ? "C" : "");
}
util::stream_format(stream, " ;A=%04X", addr);
if (prb | rts | rd)
stream << " ?:" << (prb ? "PRB " : "") << (rts ? "RTS " : "") << (rd ? "RD " : "");
return ret ? 0 : kl1839vm1_disassembler::STEP_OVER;
}
static const void zsch(std::ostream &stream, u32 op)
{
stream << "ZS4 :";
if (BIT(~op, 16)) // mcc == 0
{
const u8 cnst = BIT(op, 2, 8);
util::stream_format(stream, "S4=K(%02X) ;", cnst);
}
else
{
//const u8 cnst = BIT(op, 8, 2);
const u8 obb = BIT(op, 2, 6);
util::stream_format(stream, "S4=K(%04X) ;", obb);
}
}
static const void psch(std::ostream &stream, u32 op)
{
stream << "PS4 :";
if (BIT(~op, 16)) // madr == 0
{
const u8 addr = BIT(op, 2, 14);
util::stream_format(stream, " ;A=%04X", addr);
}
else
{
stream << "...";
}
}
static const void rts(std::ostream &stream, u32 op)
{
stream << "RTS : ;";
}
static const void acc(std::ostream &stream, u32 op)
{
stream << "ACC : ;";
}
static const void chka(std::ostream &stream, u32 op)
{
stream << "4KA :";
if (BIT(~op, 16)) // madr == 0
{
const u16 addr = BIT(op, 2, 14);
util::stream_format(stream, " ;A=%04X", addr);
}
else
{
stream << "??";
}
}
static const void chlk(std::ostream &stream, u32 op)
{
const bool sb = BIT(op, 1);
const u32 cnst = BIT(op, 2, 24);
util::stream_format(stream, "4LK :SB%X/K(%06X) ;", sb, cnst);
}
static const void srf(std::ostream &stream, u32 op)
{
if (!BIT(op, 1, 25))
{
stream << "NOP : ;";
}
else if (BIT(op, 4))
{
stream << "OCT : ;";
}
else
{
stream << "SRF : ;";
stream << (BIT(op, 25) ? "WIMM " : "");
stream << (BIT(op, 21) ? "SFP1 " : "");
stream << (BIT(op, 20) ? "RFP1 " : "");
stream << (BIT(op, 5) ? "DEC " : "");
stream << (BIT(op, 2) ? "JDZRA " : "");
stream << (BIT(op, 1) ? "INC " : "");
}
}
static const void flag(std::ostream &stream, u32 op)
{
stream << "FLAG : ;";
stream << (BIT(op, 23) ? "INTMS " : "");
stream << (BIT(op, 22) ? "RCPU " : "");
stream << (BIT(op, 21) ? "SIVV " : "");
stream << (BIT(op, 20) ? "CCFPU " : "");
stream << (BIT(op, 19) ? "PROB " : "");
stream << (BIT(op, 17) ? "SIU " : "");
stream << (BIT(op, 16) ? "TOU " : "");
stream << (BIT(op, 15) ? "COPWT " : "");
}
static const void rest(std::ostream &stream, u32 op)
{
stream << "REST : ;";
}
offs_t kl1839vm1_disassembler::disassemble(std::ostream &stream, offs_t pc, const kl1839vm1_disassembler::data_buffer &opcodes, const kl1839vm1_disassembler::data_buffer ¶ms)
{
u32 op = opcodes.r32(pc);
u32 step = 0;
if ((op & 0xc0000000) == 0x00000000) // MA
{
if ((op & 0xff000000) == 0x01000000)
flag(stream, op);
else if ((op & 0xff000000) == 0x05000000)
rest(stream, op);
else
ma(stream, op);
}
else if ((op & 0xc0000000) == 0x40000000) // MB
{
mb(stream, op);
}
else if ((op & 0xc0000000) == 0x80000000) // MC
{
mc(stream, op);
}
else
{
if ((op & 0xfc000000) == 0xe0000000)
{
step |= mk(stream, op);
}
else if ((op & 0xe0000000) == 0xc0000000)
{
step |= yp(stream, op) | STEP_COND;
}
else if ((op & 0xfc000000) == 0xec000000)
zsch(stream, op);
else if ((op & 0xfc000000) == 0xe4000000)
{
psch(stream, op);
step |= STEP_COND;
}
else if ((op & 0xfc000000) == 0xf0000000)
{
rts(stream, op);
step |= STEP_OUT;
}
else if ((op & 0xfc000000) == 0xe8000000)
acc(stream, op);
else if ((op & 0xfc000000) == 0xf4000000)
chka(stream, op);
else if ((op & 0xfc000000) == 0xf8000000)
chlk(stream, op);
else if ((op & 0xfc000000) == 0xfc000000)
srf(stream, op);
else
stream << "<invalid>";
}
if (op & 1)
{
stream << "S";
}
return 1 | SUPPORTED | step;
}
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