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|
// license:BSD-3-Clause
// copyright-holders:Vas Crabb
#include "emu.h"
#include "dsp16dis.h"
/***************************************************************************
WE|AT&T DSP16 series disassembler
***************************************************************************/
/***********************************************************************
construction/destruction
***********************************************************************/
dsp16_disassembler::dsp16_disassembler() : m_host(nullptr)
{
}
dsp16_disassembler::dsp16_disassembler(cpu const &host) : m_host(&host)
{
}
/***********************************************************************
util::disasm_interface implementation
***********************************************************************/
u32 dsp16_disassembler::interface_flags() const
{
return PAGED;
}
u32 dsp16_disassembler::page_address_bits() const
{
return 12U;
}
u32 dsp16_disassembler::opcode_alignment() const
{
return 1U;
}
offs_t dsp16_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
u8 length(1U);
u32 flags(0U);
u16 const op(opcodes.r16(pc));
switch (op >> 11)
{
// control group (p3-14)
case 0x00: case 0x01: // goto JA (p3-20)
case 0x10: case 0x11: // call JA (p3-23)
stream << dasm_ja(op, pc, flags).text << check_branch_predicate(pc);
break;
case 0x18: // goto B (p3-21)
stream << ((op & 0x00ffU) ? dasm_int(op) : dasm_b(op, flags)).text;
break;
case 0x1a: // if CON goto/call/return # icall (p3-22 # p3-24)
if (0xd40e == op)
{
util::stream_format(stream, "icall");
flags |= STEP_OVER;
}
else if ((op >> 5) & 0x003fU)
{
stream << dasm_int(op).text;
}
else
{
result const con(dasm_con(op));
u16 const op2(opcodes.r16(inc_pc(pc, 1)));
result controlled{ true, false, { } };
switch (op2 >> 11)
{
case 0x00: case 0x01: // goto JA (p3-20)
case 0x10: case 0x11: // call JA (p3-23)
controlled = dasm_ja(op2, pc, flags);
length = 2U;
break;
case 0x18: // goto B (p3-21)
switch ((op >> 8) & 0x0007U)
{
case 0x0: // return
case 0x2: // goto pt
case 0x3: // call pt
controlled = dasm_b(op2, flags);
length = 2U;
break;
}
break;
}
char const *const comment(controlled.nop ? "" : check_branch_con(pc, op));
util::stream_format(
stream, "if %1$s%2$s%3$s%4$s",
con.text, controlled.nop ? "" : " ", controlled.text, comment);
if (!controlled.nop)
flags |= STEP_COND;
}
break;
// cache instructions (p3-18)
case 0x0e: // do K { instr1...instrNI } # redo K (p3-25
{
u16 const ni((op & 0x0780U) >> 7);
u16 const k(op & 0x007fU);
if (2U > k)
{
stream << dasm_int(op).text;
}
else if (ni)
{
offs_t const instr1(inc_pc(pc, 1));
offs_t const instrni(inc_pc(pc, ni));
util::stream_format(
stream, (1U < ni) ? "do %1$u { 0x%2$04x...0x%3$04x }" : "do %1$u { 0x%2$04x }",
k, instr1, instrni);
// TODO: increase skip field size for step over to support this instruction
}
else
{
util::stream_format(stream, "redo %1$u", k);
flags |= STEP_OVER;
}
}
break;
// data move instructions (p3-16)
case 0x02: case 0x03: // R = M (p3-27)
{
u16 const m(op & 0x01ffU);
switch ((op >> 9) & 0x0007U)
{
case 0x0: util::stream_format(stream, "set j = 0x%03x", m); break;
case 0x1: util::stream_format(stream, "set k = 0x%03x", m); break;
case 0x2: util::stream_format(stream, "set rb = 0x%03x", m); break;
case 0x3: util::stream_format(stream, "set re = 0x%03x", m); break;
default: util::stream_format(stream, "set r%u = 0x%03x", (op >> 9) & 0x0003U, m); break;
}
}
break;
case 0x0a: // R = N (p3-28)
if (op & 0x000fU)
{
stream << dasm_int(op).text;
}
else
{
length = 2U;
bool const low(!((op >> 8) & 0x0003U));
result const r(dasm_r(op));
u16 const n(opcodes.r16(inc_pc(pc, 1)));
util::stream_format(
stream, (low && r.ambiguous) ? "move %1$s = 0x%2$04x" : "%1$s = 0x%2$04x",
r.text, n);
}
break;
case 0x09: case 0x0b: // R = aS (p3-29)
{
bool const high((op >> 8) & 0x0003U);
result const r(dasm_r(op));
util::stream_format(
stream, (high && r.ambiguous) ? "move %1$s = a%2$u" : "%1$s = a%2$u",
r.text, (op >> 12) & 0x0001U);
}
break;
case 0x08: // aT = R (p3-30)
{
bool const high((op >> 8) & 0x0003U);
result const r(dasm_r(op));
util::stream_format(
stream, (high && r.ambiguous) ? "move a%1$u = %2$s" : "a%1$u = %2$s",
(~op >> 10) & 0x0001U, r.text);
}
break;
case 0x0f: // R = Y (p3-32)
if ((op >> 10) & 0x0001U)
{
stream << dasm_int(op).text;
}
else
{
bool const high((op >> 8) & 0x0003U);
result const r(dasm_r(op)), y(dasm_y(op));
util::stream_format(
stream, (high && r.ambiguous) ? "move %1$u = %2$s" : "%1$u = %2$s",
r.text, y.text);
}
break;
case 0x0c: // Y = R (p3-33)
{
bool const high((op >> 8) & 0x0003U);
result const r(dasm_r(op)), y(dasm_y(op));
util::stream_format(
stream, (high && r.ambiguous) ? "move %1$u = %2$s" : "%1$u = %2$s",
y.text, r.text);
}
break;
case 0x0d: // Z : R (p3-34)
{
bool const high((op >> 8) & 0x0003U);
result const r(dasm_r(op)), z(dasm_z(op));
util::stream_format(
stream, (high && r.ambiguous) ? "move %1$u : %2$s" : "%1$u : %2$s",
z.text, r.text);
}
break;
// special function group (p3-12)
case 0x13: // if CON F2 (p3-36)
case 0x12: // ifc CON F2 (p3-37)
{
result const f2(dasm_f2(op)), con(dasm_con(op));
bool const conditional((op & 0x0001U) || f2.ambiguous || !con.nop);
char const *const comment(conditional ? check_special_con(pc, op) : "");
util::stream_format(
stream, conditional ? "if%1$s %2$s %3$s%4$s" : "%3$s%4$s",
(op & 0x0800U) ? "" : "c", con.text, f2.text, comment);
}
break;
// multiply/ALU group (p3-6)
case 0x06: // F1 ; Y (p3-38)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, "%1$s ; %2$s",
f1.text, y.text);
}
break;
case 0x1c: // F1 ; Y=a0[l] (p3-40)
case 0x04: // F1 ; Y=a1[l] (p3-40)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "%2$s = a%3$u%4$s" : "%1$s ; %2$s = a%3$u%4$s",
f1.text, y.text, (~op >> 14) & 0x0001U, ((op >> 4) & 0x0001U) ? "" : "l");
}
break;
case 0x16: // F1 ; x = Y (p3-42)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "au x = %2$s" : "%1$s ; x = %2$s",
f1.text, y.text);
}
break;
case 0x17: // F1 ; y[l] = Y (p3-44)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "au y%2$s = %3$s" : "%1$s ; y%2$s = %3$s",
f1.text, ((op >> 4) & 0x0001U) ? "" : "l", y.text);
}
break;
case 0x1f: // F1 ; y = Y ; x = *pt++[i] (p3-46)
{
result const f1(dasm_f1(op)), x(dasm_x(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "y = %2$s ; %3$s" : "%1$s ; y = %2$s ; %3$s",
f1.text, y.text, x.text);
}
break;
case 0x19: // F1 ; y = a0 ; x = *pt++[i] (p3-48)
case 0x1b: // F1 ; y = a1 ; x = *pt++[i] (p3-48)
if (op & 0x000fU)
{
stream << dasm_int(op).text;
}
else
{
result const f1(dasm_f1(op)), x(dasm_x(op));
util::stream_format(
stream, f1.nop ? "y = a%2$u ; %3$s" : "%1$s ; y = a%2$u ; %3$s",
f1.text, (op >> 12) & 0x0001U, x.text);
}
break;
case 0x07: // F1 ; aT[l] = Y (p3-50)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "a%2$u%3$s = %4$s" : "%1$s ; a%2$u%3$s = %4$s",
f1.text, (~op >> 10) & 0x0001U, ((op >> 4) & 0x0001U) ? "" : "l", y.text);
}
break;
case 0x14: // F1 ; Y = y[l] (p3-52)
{
result const f1(dasm_f1(op)), y(dasm_y(op));
util::stream_format(
stream, f1.nop ? "au %2$s = y%3$s" : "%1$s ; %2$s = y%3$s",
f1.text, y.text, ((op >> 4) & 0x0001U) ? "" : "l");
}
break;
case 0x15: // F1 ; Z : y[l] (p3-54)
{
result const f1(dasm_f1(op)), z(dasm_z(op));
util::stream_format(
stream, f1.nop ? "au %2$s : y%3$s" : "%1$s ; %2$s : y%3$s",
f1.text, z.text, ((op >> 4) & 0x0001U) ? "" : "l");
}
break;
case 0x05: // F1 ; Z : aT[l] (p3-56)
{
result const f1(dasm_f1(op)), z(dasm_z(op));
util::stream_format(
stream, f1.nop ? "%2$s : a%3$u4$s" : "%1$s ; %2$s : a%3$u4$s",
f1.text, z.text, (~op >> 10) & 0x0001U, ((op >> 4) & 0x0001U) ? "" : "l");
}
break;
case 0x1d: // F1 ; Z : y ; x=*pt++[i] (p3-58)
{
result const f1(dasm_f1(op)), x(dasm_x(op)), z(dasm_z(op));
util::stream_format(
stream, f1.nop ? "%2$s : y ; %3$s" : "%1$s ; %2$s : y ; %3$s",
f1.text, z.text, x.text);
}
break;
case 0x1e: // Reserved
stream << dasm_int(op).text;
break;
default:
throw false;
}
return length | flags | SUPPORTED;
}
/***********************************************************************
sub-instruction helpers
***********************************************************************/
dsp16_disassembler::result dsp16_disassembler::dasm_int(u16 op)
{
return result{ false, false, util::string_format("int 0x%04x", op) };
}
dsp16_disassembler::result dsp16_disassembler::dasm_con(u16 op)
{
u16 const con(op & 0x001fU);
switch (con)
{
case 0x00: return result{ false, false, "mi" };
case 0x01: return result{ false, false, "pl" };
case 0x02: return result{ false, false, "eq" };
case 0x03: return result{ false, false, "ne" };
case 0x04: return result{ false, false, "lvs" };
case 0x05: return result{ false, false, "lvc" };
case 0x06: return result{ false, false, "mvs" };
case 0x07: return result{ false, false, "mvc" };
case 0x08: return result{ false, false, "heads" };
case 0x09: return result{ false, false, "tails" };
case 0x0a: return result{ false, false, "c0ge" };
case 0x0b: return result{ false, false, "c0lt" };
case 0x0c: return result{ false, false, "c1ge" };
case 0x0d: return result{ false, false, "c1lt" };
case 0x0e: return result{ true, false, "true" };
case 0x0f: return result{ false, false, "false" };
case 0x10: return result{ false, false, "gt" };
case 0x11: return result{ false, false, "le" };
}
return result{ false, false, "if Reserved(0x%01x)" };
}
dsp16_disassembler::result dsp16_disassembler::dasm_b(u16 op, u32 &flags)
{
u16 const b((op >> 8) & 0x0007U);
switch (b)
{
case 0x0: flags |= STEP_OUT; return result{ false, false, "return" };
case 0x1: flags |= STEP_OUT; return result{ false, false, "ireturn" };
case 0x2: return result{ false, false, "goto pt" };
case 0x3: flags |= STEP_OVER; return result{ false, false, "call pt" };
}
return result{ false, false, util::string_format("goto Reserved(0x%01x)", b) };
}
dsp16_disassembler::result dsp16_disassembler::dasm_ja(u16 op, offs_t pc, u32 &flags)
{
if ((op >> 15) & 0x0001U)
flags |= STEP_OVER;
u16 const ja(op & 0x0fffU);
return result{
false,
false,
util::string_format(
(op >> 15) & 0x0001U ? "call 0x%1$04x" : "goto 0x%1$04x",
(pc & ~((offs_t(1) << 12) - 1)) | ja) };
}
dsp16_disassembler::result dsp16_disassembler::dasm_f1(u16 op)
{
u16 const d((op >> 10) & 0x0001U);
u16 const s((op >> 9) & 0x0001U);
switch ((op >> 5) & 0x000fU)
{
case 0x00: return result{ false, false, util::string_format("a%u = p ; p = x*y", d) };
case 0x01: return result{ false, false, util::string_format("a%u = a%u + p ; p = x*y", d, s) };
case 0x02: return result{ false, false, util::string_format("p = x*y") };
case 0x03: return result{ false, false, util::string_format("a%u = a%u-p ; p = x*y", d, s) };
case 0x04: return result{ false, true, util::string_format("a%u = p", d) };
case 0x05: return result{ false, false, util::string_format("a%u = a%u+p", d, s) };
case 0x06: return result{ true, false, util::string_format("nop") };
case 0x07: return result{ false, false, util::string_format("a%u = a%u-p", d, s) };
case 0x08: return result{ false, false, util::string_format("a%u = a%u|y", d, s) };
case 0x09: return result{ false, false, util::string_format("a%u = a%u^y", d, s) };
case 0x0a: return result{ false, false, util::string_format("a%u&y", s) };
case 0x0b: return result{ false, false, util::string_format("a%u-y", s) };
case 0x0c: return result{ false, true, util::string_format("a%u = y", d) };
case 0x0d: return result{ false, false, util::string_format("a%u = a%u+y", d, s) };
case 0x0e: return result{ false, false, util::string_format("a%u = a%u&y", d, s) };
case 0x0f: return result{ false, false, util::string_format("a%u = a%u-y", d, s) };
}
throw false;
}
dsp16_disassembler::result dsp16_disassembler::dasm_f2(u16 op)
{
u16 const d((op >> 10) & 0x0001U);
u16 const s((op >> 9) & 0x0001U);
u16 const f2((op >> 5) & 0x000fU);
switch (f2)
{
case 0x00: return result{ false, false, util::string_format("a%u = a%u>>1", d, s) };
case 0x01: return result{ false, false, util::string_format("a%u = a%u<<1", d, s) };
case 0x02: return result{ false, false, util::string_format("a%u = a%u>>4", d, s) };
case 0x03: return result{ false, false, util::string_format("a%u = a%u<<4", d, s) };
case 0x04: return result{ false, false, util::string_format("a%u = a%u>>8", d, s) };
case 0x05: return result{ false, false, util::string_format("a%u = a%u<<8", d, s) };
case 0x06: return result{ false, false, util::string_format("a%u = a%u>>16", d, s) };
case 0x07: return result{ false, false, util::string_format("a%u = a%u<<16", d, s) };
case 0x08: return result{ false, true, util::string_format("a%u = p", d) };
case 0x09: return result{ false, false, util::string_format("a%uh = a%uh+1", d, s) };
case 0x0a: return result{ false, false, util::string_format("Reserved(0x%01x)", f2) };
case 0x0b: return result{ false, false, util::string_format("a%u = rnd(a%u)", d, s) };
case 0x0c: return result{ false, true, util::string_format("a%u = y", d) };
case 0x0d: return result{ false, false, util::string_format("a%u = a%u+1", d, s) };
case 0x0e: return result{ false, false, util::string_format("a%u = a%u", d, s) };
case 0x0f: return result{ false, false, util::string_format("a%u = -a%u", d, s) };
}
throw false;
}
dsp16_disassembler::result dsp16_disassembler::dasm_r(u16 op)
{
u16 const r((op >> 4) & 0x001fU);
switch (r)
{
case 0x00: return result{ false, true, "r0" };
case 0x01: return result{ false, true, "r1" };
case 0x02: return result{ false, true, "r2" };
case 0x03: return result{ false, true, "r3" };
case 0x04: return result{ false, true, "j" };
case 0x05: return result{ false, true, "k" };
case 0x06: return result{ false, true, "rb" };
case 0x07: return result{ false, true, "re" };
case 0x08: return result{ false, false, "pt" };
case 0x09: return result{ false, false, "pr" };
case 0x0a: return result{ false, false, "pi" };
case 0x0b: return result{ false, false, "i" };
case 0x10: return result{ false, true, "x" };
case 0x11: return result{ false, true, "y" };
case 0x12: return result{ false, true, "yl" };
case 0x13: return result{ false, false, "auc" };
case 0x14: return result{ false, false, "psw" };
case 0x15: return result{ false, false, "c0" };
case 0x16: return result{ false, false, "c1" };
case 0x17: return result{ false, false, "c2" };
case 0x18: return result{ false, false, "sioc" };
case 0x19: return result{ false, false, "srta" };
case 0x1a: return result{ false, false, "sdx" };
case 0x1b: return result{ false, false, "tdms" };
case 0x1c: return result{ false, false, "pioc" };
case 0x1d: return result{ false, false, "pdx0" };
case 0x1e: return result{ false, false, "pdx1" };
}
return result{ false, false, util::string_format("Reserved(0x%02x)", r) };
}
dsp16_disassembler::result dsp16_disassembler::dasm_x(u16 op)
{
u16 const x((op >> 4) & 0x0001U);
return result{ false, false, x ? "x = *pt++i" : "x = *pt++" };
}
dsp16_disassembler::result dsp16_disassembler::dasm_y(u16 op)
{
u16 const r((op >> 2) & 0x0003U);
switch (op & 0x0003U)
{
case 0x00: return result{ false, false, util::string_format("*r%u", r) };
case 0x01: return result{ false, false, util::string_format("*r%u++", r) };
case 0x02: return result{ false, false, util::string_format("*r%u--", r) };
case 0x03: return result{ false, false, util::string_format("*r%u++j", r) };
}
throw false;
}
dsp16_disassembler::result dsp16_disassembler::dasm_z(u16 op)
{
u16 const r((op >> 2) & 0x0003U);
switch (op & 0x0003U)
{
case 0x00: return result{ false, false, util::string_format("*r%uzp", r) };
case 0x01: return result{ false, false, util::string_format("*r%upz", r) };
case 0x02: return result{ false, false, util::string_format("*r%um2", r) };
case 0x03: return result{ false, false, util::string_format("*r%ujk", r) };
}
throw false;
}
/***********************************************************************
common maths
***********************************************************************/
constexpr offs_t dsp16_disassembler::inc_pc(offs_t pc, offs_t inc)
{
return (pc & ~((offs_t(1) << 12) - 1)) | ((pc + inc) & ((offs_t(1) << 12) - 1));
}
/***********************************************************************
live state checks
***********************************************************************/
char const *dsp16_disassembler::check_branch_predicate(offs_t pc) const
{
if (m_host)
{
switch (m_host->check_branch(pc))
{
case cpu::predicate::INDETERMINATE: return "";
case cpu::predicate::TAKEN: return " // will branch";
case cpu::predicate::SKIPPED: return " // will fall through";
}
throw false;
}
else
{
return "";
}
}
char const *dsp16_disassembler::check_branch_con(offs_t pc, u16 op) const
{
if (m_host)
{
switch (m_host->check_con(pc, op))
{
case cpu::predicate::INDETERMINATE: return "";
case cpu::predicate::TAKEN: return " // will branch";
case cpu::predicate::SKIPPED: return " // will fall through";
}
throw false;
}
else
{
return "";
}
}
char const *dsp16_disassembler::check_special_con(offs_t pc, u16 op) const
{
if (m_host)
{
switch (m_host->check_con(pc, op))
{
case cpu::predicate::INDETERMINATE: return "";
case cpu::predicate::TAKEN: return " // will execute";
case cpu::predicate::SKIPPED: return " // will skip";
}
throw false;
}
else
{
return "";
}
}
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