bool mips3_frontend::describe_cop2(UINT32 op, opcode_desc &desc)
{
// any COP2 instruction can potentially cause an exception
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: // MFCz
case 0x01: // DMFCz
case 0x02: // CFCz
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x04: // MTCz
case 0x05: // DMTCz
case 0x06: // CTCz
desc.regin[0] |= REGFLAG_R(RTREG);
return true;
case 0x08: // BC
switch (RTREG)
{
case 0x00: // BCzF
case 0x01: // BCzT
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
return true;
}
return false;
}
return false;
}
static int describe_instruction_cop2(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
/* any COP2 instruction can potentially cause an exception */
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: /* MFCz */
case 0x01: /* DMFCz */
case 0x02: /* CFCz */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x04: /* MTCz */
case 0x05: /* DMTCz */
case 0x06: /* CTCz */
desc->regin[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x08: /* BC */
switch (RTREG)
{
case 0x00: /* BCzF */
case 0x01: /* BCzT */
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
return TRUE;
}
return FALSE;
}
return FALSE;
}
bool sh2_frontend::describe_group_8(opcode_desc &desc, const opcode_desc *prev, UINT16 opcode)
{
INT32 disp;
switch ( opcode & (15<<8) )
{
case 0 << 8: // MOVBS4(opcode & 0x0f, Rm);
case 1 << 8: // MOVWS4(opcode & 0x0f, Rm);
desc.regin[0] |= REGFLAG_R(Rm) | REGFLAG_R(0);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 2<< 8: // NOP();
case 3<< 8: // NOP();
case 6<< 8: // NOP();
case 7<< 8: // NOP();
case 10<< 8: // NOP();
case 12<< 8: // NOP();
case 14<< 8: // NOP();
return true;
case 4<< 8: // MOVBL4(Rm, opcode & 0x0f);
case 5<< 8: // MOVWL4(Rm, opcode & 0x0f);
desc.regin[0] |= REGFLAG_R(Rm);
desc.regout[0] |= REGFLAG_R(0);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 8<< 8: // CMPIM(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(Rm);
desc.regin[1] |= REGFLAG_SR;
desc.regout[1] |= REGFLAG_SR;
return true;
case 9<< 8: // BT(opcode & 0xff);
case 11<< 8: // BF(opcode & 0xff);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc.cycles = 3;
disp = ((INT32)opcode << 24) >> 24;
desc.targetpc = (desc.pc + 2) + disp * 2 + 2;
return true;
case 13<< 8: // BTS(opcode & 0xff);
case 15<< 8: // BFS(opcode & 0xff);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc.cycles = 2;
disp = ((INT32)opcode << 24) >> 24;
desc.targetpc = (desc.pc + 2) + disp * 2 + 2;
desc.delayslots = 1;
return true;
}
return false;
}
static int describe_instruction_regimm(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
switch (RTREG)
{
case 0x00: /* BLTZ */
case 0x01: /* BGEZ */
case 0x02: /* BLTZL */
case 0x03: /* BGEZL */
if (RTREG == 0x01 && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
desc->skipslots = (RTREG & 0x02) ? 1 : 0;
return TRUE;
case 0x08: /* TGEI */
case 0x09: /* TGEIU */
case 0x0a: /* TLTI */
case 0x0b: /* TLTIU */
case 0x0c: /* TEQI */
case 0x0e: /* TNEI */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x10: /* BLTZAL */
case 0x11: /* BGEZAL */
case 0x12: /* BLTZALL */
case 0x13: /* BGEZALL */
if (RTREG == 0x11 && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->regout[0] |= REGFLAG_R(31);
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
desc->skipslots = (RTREG & 0x02) ? 1 : 0;
return TRUE;
}
return FALSE;
}
bool mips3_frontend::describe_regimm(UINT32 op, opcode_desc &desc)
{
switch (RTREG)
{
case 0x00: // BLTZ
case 0x01: // BGEZ
case 0x02: // BLTZL
case 0x03: // BGEZL
if (RTREG == 0x01 && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
desc.skipslots = (RTREG & 0x02) ? 1 : 0;
return true;
case 0x08: // TGEI
case 0x09: // TGEIU
case 0x0a: // TLTI
case 0x0b: // TLTIU
case 0x0c: // TEQI
case 0x0e: // TNEI
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x10: // BLTZAL
case 0x11: // BGEZAL
case 0x12: // BLTZALL
case 0x13: // BGEZALL
if (RTREG == 0x11 && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.regout[0] |= REGFLAG_R(31);
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
desc.skipslots = (RTREG & 0x02) ? 1 : 0;
return true;
}
return false;
}
static int describe_instruction_cop0(rsp_state *rsp, UINT32 op, opcode_desc *desc)
{
switch (RSREG)
{
case 0x00: /* MFCz */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x04: /* MTCz */
desc->regin[0] |= REGFLAG_R(RTREG);
return TRUE;
}
return FALSE;
}
bool rsp_frontend::describe_cop2(UINT32 op, opcode_desc &desc)
{
switch (RSREG)
{
case 0x00: // MFCz
case 0x02: // CFCz
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x04: // MTCz
case 0x06: // CTCz
desc.regin[0] |= REGFLAG_R(RTREG);
return true;
}
return false;
}
bool sh2_frontend::describe_group_12(opcode_desc &desc, const opcode_desc *prev, UINT16 opcode)
{
switch (opcode & (15<<8))
{
case 0<<8: // MOVBSG(opcode & 0xff);
case 1<<8: // MOVWSG(opcode & 0xff);
case 2<<8: // MOVLSG(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(0);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 3<<8: // TRAPA(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(15);
desc.regin[1] |= REGFLAG_VBR;
desc.regout[0] |= REGFLAG_R(15);
desc.cycles = 8;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
return true;
case 4<<8: // MOVBLG(opcode & 0xff);
case 5<<8: // MOVWLG(opcode & 0xff);
case 6<<8: // MOVLLG(opcode & 0xff);
case 7<<8: // MOVA(opcode & 0xff);
desc.regout[0] |= REGFLAG_R(0);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 8<<8: // TSTI(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(0);
desc.regin[1] |= REGFLAG_SR;
desc.regout[1] |= REGFLAG_SR;
return true;
case 9<<8: // ANDI(opcode & 0xff);
case 10<<8: // XORI(opcode & 0xff);
case 11<<8: // ORI(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(0);
desc.regout[0] |= REGFLAG_R(0);
return true;
case 12<<8: // TSTM(opcode & 0xff);
case 13<<8: // ANDM(opcode & 0xff);
case 14<<8: // XORM(opcode & 0xff);
case 15<<8: // ORM(opcode & 0xff);
desc.regin[0] |= REGFLAG_R(0);
desc.regin[1] |= REGFLAG_SR | REGFLAG_GBR;
desc.regout[1] |= REGFLAG_SR;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
}
return false;
}
static int describe_instruction_idt(mips3_state *mips, UINT32 op, opcode_desc *desc)
{
switch (op & 0x1f)
{
case 0: /* MAD */
case 1: /* MADU */
desc->gpr.used |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG) | REGFLAG_LO | REGFLAG_HI;
desc->gpr.modified |= REGFLAG_LO | REGFLAG_HI;
return TRUE;
case 2: /* MUL */
desc->gpr.used |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->gpr.modified |= REGFLAG_R(RDREG);
desc->cycles = 3;
return TRUE;
}
return FALSE;
}
bool rsp_frontend::describe_cop0(UINT32 op, opcode_desc &desc)
{
switch (RSREG)
{
case 0x00: // MFCz
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x04: // MTCz
desc.regin[0] |= REGFLAG_R(RTREG);
if(RDREG == 2) // SP_RD_LEN, initiating DMA
{
desc.flags |= OPFLAG_END_SEQUENCE;
}
return true;
}
return false;
}
bool sh2_frontend::describe_group_6(opcode_desc &desc, const opcode_desc *prev, UINT16 opcode)
{
switch (opcode & 15)
{
case 0: // MOVBL(Rm, Rn);
case 1: // MOVWL(Rm, Rn);
case 2: // MOVLL(Rm, Rn);
case 3: // MOV(Rm, Rn);
case 7: // NOT(Rm, Rn);
case 9: // SWAPW(Rm, Rn);
case 11: // NEG(Rm, Rn);
case 12: // EXTUB(Rm, Rn);
case 13: // EXTUW(Rm, Rn);
case 14: // EXTSB(Rm, Rn);
case 15: // EXTSW(Rm, Rn);
desc.regin[0] |= REGFLAG_R(Rm);
desc.regout[0] |= REGFLAG_R(Rn);
return true;
case 4: // MOVBP(Rm, Rn);
case 5: // MOVWP(Rm, Rn);
case 6: // MOVLP(Rm, Rn);
desc.regin[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 8: // SWAPB(Rm, Rn);
desc.regin[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
return true;
case 10: // NEGC(Rm, Rn);
desc.regin[0] |= REGFLAG_R(Rm);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
return true;
}
return false;
}
static int describe_instruction_idt(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
/* only on the R4650 */
if (mipsaa->flavor != MIPS3_TYPE_R4650)
return FALSE;
switch (op & 0x1f)
{
case 0: /* MAD */
case 1: /* MADU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regin[2] |= REGFLAG_LO | REGFLAG_HI;
desc->regout[2] |= REGFLAG_LO | REGFLAG_HI;
return TRUE;
case 2: /* MUL */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
desc->cycles = 3;
return TRUE;
}
return FALSE;
}
static int describe_instruction_cop1x(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
/* any COP1 instruction can potentially cause an exception */
// desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (op & 0x3f)
{
case 0x00: /* LWXC1 */
case 0x01: /* LDXC1 */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[1] |= REGFLAG_CPR1(FDREG);
desc->flags |= OPFLAG_READS_MEMORY;
return TRUE;
case 0x08: /* SWXC1 */
case 0x09: /* SDXC1 */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regin[1] |= REGFLAG_CPR1(FDREG);
desc->flags |= OPFLAG_WRITES_MEMORY;
return TRUE;
case 0x0f: /* PREFX */
/* effective no-op */
return TRUE;
case 0x20: case 0x21: /* MADD */
case 0x28: case 0x29: /* MSUB */
case 0x30: case 0x31: /* NMADD */
case 0x38: case 0x39: /* NMSUB */
desc->regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG) | REGFLAG_CPR1(FRREG);
desc->regout[1] |= REGFLAG_CPR1(FDREG);
return TRUE;
}
return FALSE;
}
static int describe_instruction_regimm(rsp_state *rsp, UINT32 op, opcode_desc *desc)
{
switch (RTREG)
{
case 0x00: /* BLTZ */
case 0x01: /* BGEZ */
if (RTREG == 0x01 && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = ((desc->pc + 4 + (SIMMVAL << 2)) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
desc->skipslots = (RTREG & 0x02) ? 1 : 0;
return TRUE;
case 0x10: /* BLTZAL */
case 0x11: /* BGEZAL */
if (RTREG == 0x11 && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->regout[0] |= REGFLAG_R(31);
desc->targetpc = ((desc->pc + 4 + (SIMMVAL << 2)) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
desc->skipslots = (RTREG & 0x02) ? 1 : 0;
return TRUE;
}
return FALSE;
}
bool mips3_frontend::describe_cop1x(UINT32 op, opcode_desc &desc)
{
// any COP1 instruction can potentially cause an exception
// desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (op & 0x3f)
{
case 0x00: // LWXC1
case 0x01: // LDXC1
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[1] |= REGFLAG_CPR1(FDREG);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x08: // SWXC1
case 0x09: // SDXC1
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regin[1] |= REGFLAG_CPR1(FDREG);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x0f: // PREFX
// effective no-op
return true;
case 0x20: case 0x21: // MADD
case 0x28: case 0x29: // MSUB
case 0x30: case 0x31: // NMADD
case 0x38: case 0x39: // NMSUB
desc.regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG) | REGFLAG_CPR1(FRREG);
desc.regout[1] |= REGFLAG_CPR1(FDREG);
return true;
}
return false;
}
bool rsp_frontend::describe_regimm(UINT32 op, opcode_desc &desc)
{
switch (RTREG)
{
case 0x00: // BLTZ
case 0x01: // BGEZ
if (RTREG == 0x01 && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = ((desc.pc + 4 + SIMMVAL * 4) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
desc.skipslots = (RTREG & 0x02) ? 1 : 0;
return true;
case 0x10: // BLTZAL
case 0x11: // BGEZAL
if (RTREG == 0x11 && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.regout[0] |= REGFLAG_R(31);
desc.targetpc = ((desc.pc + 4 + SIMMVAL * 4) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
desc.skipslots = (RTREG & 0x02) ? 1 : 0;
return true;
}
return false;
}
bool mips3_frontend::describe_idt(UINT32 op, opcode_desc &desc)
{
// only on the R4650
if (m_context.flavor != MIPS3_TYPE_R4650)
return false;
switch (op & 0x1f)
{
case 0: // MAD
case 1: // MADU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regin[2] |= REGFLAG_LO | REGFLAG_HI;
desc.regout[2] |= REGFLAG_LO | REGFLAG_HI;
return true;
case 2: // MUL
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
desc.cycles = 3;
return true;
}
return false;
}
bool mips3_frontend::describe_cop1(UINT32 op, opcode_desc &desc)
{
// any COP1 instruction can potentially cause an exception
// desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: // MFCz
case 0x01: // DMFCz
desc.regin[1] |= REGFLAG_CPR1(RDREG);
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x02: // CFCz
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x04: // MTCz
case 0x05: // DMTCz
desc.regin[0] |= REGFLAG_R(RTREG);
desc.regout[1] |= REGFLAG_CPR1(RDREG);
return true;
case 0x06: // CTCz
desc.regin[0] |= REGFLAG_R(RTREG);
return true;
case 0x08: // BC
switch (RTREG & 3)
{
case 0x00: // BCzF
case 0x01: // BCzT
case 0x02: // BCzFL
case 0x03: // BCzTL
desc.regin[2] |= REGFLAG_FCC;
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
desc.skipslots = (RTREG & 0x02) ? 1 : 0;
return true;
}
return false;
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: // COP
switch (op & 0x3f)
{
case 0x12: // MOVZ - MIPS IV
case 0x13: // MOVN - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
case 0x00: // ADD
case 0x01: // SUB
case 0x02: // MUL
case 0x03: // DIV
desc.regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG);
desc.regout[1] |= REGFLAG_CPR1(FDREG);
return true;
case 0x15: // RECIP - MIPS IV
case 0x16: // RSQRT - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
case 0x04: // SQRT
case 0x05: // ABS
case 0x06: // MOV
case 0x07: // NEG
case 0x08: // ROUND.L
case 0x09: // TRUNC.L
case 0x0a: // CEIL.L
case 0x0b: // FLOOR.L
case 0x0c: // ROUND.W
case 0x0d: // TRUNC.W
case 0x0e: // CEIL.W
case 0x0f: // FLOOR.W
case 0x20: // CVT.S
case 0x21: // CVT.D
case 0x24: // CVT.W
case 0x25: // CVT.L
desc.regin[1] |= REGFLAG_CPR1(FSREG);
desc.regout[1] |= REGFLAG_CPR1(FDREG);
return true;
case 0x11: // MOVT/F - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
desc.regin[1] |= REGFLAG_CPR1(FSREG);
desc.regin[2] |= REGFLAG_FCC;
desc.regout[1] |= REGFLAG_CPR1(FDREG);
return true;
case 0x30: case 0x38: // C.F
case 0x31: case 0x39: // C.UN
desc.regout[2] |= REGFLAG_FCC;
return true;
case 0x32: case 0x3a: // C.EQ
case 0x33: case 0x3b: // C.UEQ
case 0x34: case 0x3c: // C.OLT
case 0x35: case 0x3d: // C.ULT
case 0x36: case 0x3e: // C.OLE
case 0x37: case 0x3f: // C.ULE
desc.regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG);
desc.regout[2] |= REGFLAG_FCC;
return true;
}
return false;
}
return false;
}
static int describe_instruction_special(rsp_state *rsp, UINT32 op, opcode_desc *desc)
{
switch (op & 63)
{
case 0x00: /* SLL */
case 0x02: /* SRL */
case 0x03: /* SRA */
desc->regin[0] |= REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x04: /* SLLV */
case 0x06: /* SRLV */
case 0x07: /* SRAV */
case 0x21: /* ADDU */
case 0x23: /* SUBU */
case 0x24: /* AND */
case 0x25: /* OR */
case 0x26: /* XOR */
case 0x27: /* NOR */
case 0x2a: /* SLT */
case 0x2b: /* SLTU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x20: /* ADD */
case 0x22: /* SUB */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x08: /* JR */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = BRANCH_TARGET_DYNAMIC;
desc->delayslots = 1;
return TRUE;
case 0x09: /* JALR */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RDREG);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = BRANCH_TARGET_DYNAMIC;
desc->delayslots = 1;
return TRUE;
case 0x0d: /* BREAK */
desc->flags |= OPFLAG_END_SEQUENCE;
desc->targetpc = BRANCH_TARGET_DYNAMIC;
return TRUE;
}
return FALSE;
}
bool rsp_frontend::describe(opcode_desc &desc, const opcode_desc *prev)
{
UINT32 op, opswitch;
// fetch the opcode
op = desc.opptr.l[0] = m_rsp.m_direct->read_decrypted_dword(desc.physpc | 0x1000);
// all instructions are 4 bytes and default to a single cycle each
desc.length = 4;
desc.cycles = 1;
// parse the instruction
opswitch = op >> 26;
switch (opswitch)
{
case 0x00: // SPECIAL
return describe_special(op, desc);
case 0x01: // REGIMM
return describe_regimm(op, desc);
case 0x10: // COP0
return describe_cop0(op, desc);
case 0x12: // COP2
return describe_cop2(op, desc);
case 0x02: // J
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = ((LIMMVAL << 2) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
return true;
case 0x03: // JAL
desc.regout[0] |= REGFLAG_R(31);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = ((LIMMVAL << 2) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
return true;
case 0x04: // BEQ
case 0x05: // BNE
if ((opswitch == 0x04 || opswitch == 0x14) && RSREG == RTREG)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = ((desc.pc + 4 + SIMMVAL * 4) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
desc.skipslots = (opswitch & 0x10) ? 1 : 0;
return true;
case 0x06: // BLEZ
case 0x07: // BGTZ
if ((opswitch == 0x06 || opswitch == 0x16) && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = ((desc.pc + 4 + SIMMVAL * 4) & 0x00000fff) | 0x1000;
desc.delayslots = 1;
desc.skipslots = (opswitch & 0x10) ? 1 : 0;
return true;
case 0x08: // ADDI
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x09: // ADDIU
case 0x0a: // SLTI
case 0x0b: // SLTIU
case 0x0c: // ANDI
case 0x0d: // ORI
case 0x0e: // XORI
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x0f: // LUI
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x20: // LB
case 0x21: // LH
case 0x23: // LW
case 0x24: // LBU
case 0x25: // LHU
case 0x27: // LWU
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x28: // SB
case 0x29: // SH
case 0x2b: // SW
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x32: // LWC2
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x3a: // SWC2
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
}
return false;
}
static int describe_instruction_special(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
switch (op & 63)
{
case 0x00: /* SLL */
case 0x02: /* SRL */
case 0x03: /* SRA */
case 0x38: /* DSLL */
case 0x3a: /* DSRL */
case 0x3b: /* DSRA */
case 0x3c: /* DSLL32 */
case 0x3e: /* DSRL32 */
case 0x3f: /* DSRA32 */
desc->regin[0] |= REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x0a: /* MOVZ - MIPS IV */
case 0x0b: /* MOVN - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
desc->regin[0] |= REGFLAG_R(RDREG);
case 0x04: /* SLLV */
case 0x06: /* SRLV */
case 0x07: /* SRAV */
case 0x14: /* DSLLV */
case 0x16: /* DSRLV */
case 0x17: /* DSRAV */
case 0x21: /* ADDU */
case 0x23: /* SUBU */
case 0x24: /* AND */
case 0x25: /* OR */
case 0x26: /* XOR */
case 0x27: /* NOR */
case 0x2a: /* SLT */
case 0x2b: /* SLTU */
case 0x2d: /* DADDU */
case 0x2f: /* DSUBU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x20: /* ADD */
case 0x22: /* SUB */
case 0x2c: /* DADD */
case 0x2e: /* DSUB */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RDREG);
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x30: /* TGE */
case 0x31: /* TGEU */
case 0x32: /* TLT */
case 0x33: /* TLTU */
case 0x34: /* TEQ */
case 0x36: /* TNE */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x01: /* MOVF - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regin[2] |= REGFLAG_FCC;
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x08: /* JR */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = BRANCH_TARGET_DYNAMIC;
desc->delayslots = 1;
return TRUE;
case 0x09: /* JALR */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RDREG);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = BRANCH_TARGET_DYNAMIC;
desc->delayslots = 1;
return TRUE;
case 0x10: /* MFHI */
desc->regin[0] |= REGFLAG_HI;
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x11: /* MTHI */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_HI;
return TRUE;
case 0x12: /* MFLO */
desc->regin[2] |= REGFLAG_LO;
desc->regout[0] |= REGFLAG_R(RDREG);
return TRUE;
case 0x13: /* MTLO */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[2] |= REGFLAG_LO;
return TRUE;
case 0x18: /* MULT */
case 0x19: /* MULTU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc->cycles = 3;
return TRUE;
case 0x1a: /* DIV */
case 0x1b: /* DIVU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc->cycles = 35;
return TRUE;
case 0x1c: /* DMULT */
case 0x1d: /* DMULTU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc->cycles = 7;
return TRUE;
case 0x1e: /* DDIV */
case 0x1f: /* DDIVU */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc->cycles = 67;
return TRUE;
case 0x0c: /* SYSCALL */
case 0x0d: /* BREAK */
desc->flags |= OPFLAG_WILL_CAUSE_EXCEPTION | OPFLAG_END_SEQUENCE;
return TRUE;
case 0x0f: /* SYNC */
/* effective no-op */
return TRUE;
}
return FALSE;
}
bool mips3_frontend::describe_special(UINT32 op, opcode_desc &desc)
{
switch (op & 63)
{
case 0x00: // SLL
case 0x02: // SRL
case 0x03: // SRA
case 0x38: // DSLL
case 0x3a: // DSRL
case 0x3b: // DSRA
case 0x3c: // DSLL32
case 0x3e: // DSRL32
case 0x3f: // DSRA32
desc.regin[0] |= REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x0a: // MOVZ - MIPS IV
case 0x0b: // MOVN - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
desc.regin[0] |= REGFLAG_R(RDREG);
case 0x04: // SLLV
case 0x06: // SRLV
case 0x07: // SRAV
case 0x14: // DSLLV
case 0x16: // DSRLV
case 0x17: // DSRAV
case 0x21: // ADDU
case 0x23: // SUBU
case 0x24: // AND
case 0x25: // OR
case 0x26: // XOR
case 0x27: // NOR
case 0x2a: // SLT
case 0x2b: // SLTU
case 0x2d: // DADDU
case 0x2f: // DSUBU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x20: // ADD
case 0x22: // SUB
case 0x2c: // DADD
case 0x2e: // DSUB
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x30: // TGE
case 0x31: // TGEU
case 0x32: // TLT
case 0x33: // TLTU
case 0x34: // TEQ
case 0x36: // TNE
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x01: // MOVF - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regin[2] |= REGFLAG_FCC;
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x08: // JR
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x09: // JALR
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RDREG);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x10: // MFHI
desc.regin[0] |= REGFLAG_HI;
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x11: // MTHI
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_HI;
return true;
case 0x12: // MFLO
desc.regin[2] |= REGFLAG_LO;
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x13: // MTLO
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[2] |= REGFLAG_LO;
return true;
case 0x18: // MULT
case 0x19: // MULTU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc.cycles = 3;
return true;
case 0x1a: // DIV
case 0x1b: // DIVU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc.cycles = 35;
return true;
case 0x1c: // DMULT
case 0x1d: // DMULTU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc.cycles = 7;
return true;
case 0x1e: // DDIV
case 0x1f: // DDIVU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[2] |= REGFLAG_LO | REGFLAG_HI;
desc.cycles = 67;
return true;
case 0x0c: // SYSCALL
case 0x0d: // BREAK
desc.flags |= OPFLAG_WILL_CAUSE_EXCEPTION | OPFLAG_END_SEQUENCE;
return true;
case 0x0f: // SYNC
// effective no-op
return true;
}
return false;
}
bool rsp_frontend::describe_special(UINT32 op, opcode_desc &desc)
{
switch (op & 63)
{
case 0x00: // SLL
case 0x02: // SRL
case 0x03: // SRA
desc.regin[0] |= REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x04: // SLLV
case 0x06: // SRLV
case 0x07: // SRAV
case 0x21: // ADDU
case 0x23: // SUBU
case 0x24: // AND
case 0x25: // OR
case 0x26: // XOR
case 0x27: // NOR
case 0x2a: // SLT
case 0x2b: // SLTU
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x20: // ADD
case 0x22: // SUB
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RDREG);
return true;
case 0x08: // JR
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x09: // JALR
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RDREG);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x0d: // BREAK
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = (op >> 5) & 0x000fffff;
return true;
}
return false;
}
int mips3fe_describe(void *param, opcode_desc *desc, const opcode_desc *prev)
{
mips3_state *mipsaa = (mips3_state *)param;
UINT32 op, opswitch;
/* compute the physical PC */
if (!mips3com_translate_address(mipsaa, ADDRESS_SPACE_PROGRAM, TRANSLATE_FETCH, &desc->physpc))
{
/* uh-oh: a page fault; leave the description empty and just if this is the first instruction, leave it empty and */
/* mark as needing to validate; otherwise, just end the sequence here */
desc->flags |= OPFLAG_VALIDATE_TLB | OPFLAG_CAN_CAUSE_EXCEPTION | OPFLAG_COMPILER_PAGE_FAULT | OPFLAG_VIRTUAL_NOOP | OPFLAG_END_SEQUENCE;
return TRUE;
}
/* fetch the opcode */
op = desc->opptr.l[0] = memory_decrypted_read_dword(mipsaa->program, desc->physpc);
/* all instructions are 4 bytes and default to a single cycle each */
desc->length = 4;
desc->cycles = 1;
/* parse the instruction */
opswitch = op >> 26;
switch (opswitch)
{
case 0x00: /* SPECIAL */
return describe_instruction_special(mipsaa, op, desc);
case 0x01: /* REGIMM */
return describe_instruction_regimm(mipsaa, op, desc);
case 0x10: /* COP0 */
return describe_instruction_cop0(mipsaa, op, desc);
case 0x11: /* COP1 */
return describe_instruction_cop1(mipsaa, op, desc);
case 0x12: /* COP2 */
return describe_instruction_cop2(mipsaa, op, desc);
case 0x13: /* COP1X - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
return describe_instruction_cop1x(mipsaa, op, desc);
case 0x1c: /* IDT-specific opcodes: mad/madu/mul on R4640/4650, msub on RC32364 */
return describe_instruction_idt(mipsaa, op, desc);
case 0x02: /* J */
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = (desc->pc & 0xf0000000) | (LIMMVAL << 2);
desc->delayslots = 1;
return TRUE;
case 0x03: /* JAL */
desc->regout[0] |= REGFLAG_R(31);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = (desc->pc & 0xf0000000) | (LIMMVAL << 2);
desc->delayslots = 1;
return TRUE;
case 0x04: /* BEQ */
case 0x05: /* BNE */
case 0x14: /* BEQL */
case 0x15: /* BNEL */
if ((opswitch == 0x04 || opswitch == 0x14) && RSREG == RTREG)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
desc->skipslots = (opswitch & 0x10) ? 1 : 0;
return TRUE;
case 0x06: /* BLEZ */
case 0x07: /* BGTZ */
case 0x16: /* BLEZL */
case 0x17: /* BGTZL */
if ((opswitch == 0x06 || opswitch == 0x16) && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
desc->skipslots = (opswitch & 0x10) ? 1 : 0;
return TRUE;
case 0x08: /* ADDI */
case 0x18: /* DADDI */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x09: /* ADDIU */
case 0x0a: /* SLTI */
case 0x0b: /* SLTIU */
case 0x0c: /* ANDI */
case 0x0d: /* ORI */
case 0x0e: /* XORI */
case 0x19: /* DADDIU */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x0f: /* LUI */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x1a: /* LDL */
case 0x1b: /* LDR */
case 0x22: /* LWL */
case 0x26: /* LWR */
desc->regin[0] |= REGFLAG_R(RTREG);
case 0x20: /* LB */
case 0x21: /* LH */
case 0x23: /* LW */
case 0x24: /* LBU */
case 0x25: /* LHU */
case 0x27: /* LWU */
case 0x30: /* LL */
case 0x34: /* LLD */
case 0x37: /* LD */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
desc->flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x28: /* SB */
case 0x29: /* SH */
case 0x2a: /* SWL */
case 0x2b: /* SW */
case 0x2c: /* SDL */
case 0x2d: /* SDR */
case 0x2e: /* SWR */
case 0x3f: /* SD */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x38: /* SC */
case 0x3c: /* SCD */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->regout[0] |= REGFLAG_R(RTREG);
desc->flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x31: /* LWC1 */
case 0x35: /* LDC1 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[1] |= REGFLAG_CPR1(RTREG);
desc->flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x39: /* SWC1 */
case 0x3d: /* SDC1 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regin[1] |= REGFLAG_CPR1(RTREG);
desc->flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x32: /* LWC2 */
case 0x36: /* LDC2 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x3a: /* SWC2 */
case 0x3e: /* SDC2 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return TRUE;
case 0x33: /* PREF */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
case 0x2f: /* CACHE */
/* effective no-op */
return TRUE;
}
return FALSE;
}
static int describe_instruction_cop1(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
/* any COP1 instruction can potentially cause an exception */
// desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: /* MFCz */
case 0x01: /* DMFCz */
desc->regin[1] |= REGFLAG_CPR1(RDREG);
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x02: /* CFCz */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x04: /* MTCz */
case 0x05: /* DMTCz */
desc->regin[0] |= REGFLAG_R(RTREG);
desc->regout[1] |= REGFLAG_CPR1(RDREG);
return TRUE;
case 0x06: /* CTCz */
desc->regin[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x08: /* BC */
switch (RTREG & 3)
{
case 0x00: /* BCzF */
case 0x01: /* BCzT */
case 0x02: /* BCzFL */
case 0x03: /* BCzTL */
desc->regin[2] |= REGFLAG_FCC;
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
desc->skipslots = (RTREG & 0x02) ? 1 : 0;
return TRUE;
}
return FALSE;
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: /* COP */
switch (op & 0x3f)
{
case 0x12: /* MOVZ - MIPS IV */
case 0x13: /* MOVN - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
case 0x00: /* ADD */
case 0x01: /* SUB */
case 0x02: /* MUL */
case 0x03: /* DIV */
desc->regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG);
desc->regout[1] |= REGFLAG_CPR1(FDREG);
return TRUE;
case 0x15: /* RECIP - MIPS IV */
case 0x16: /* RSQRT - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
case 0x04: /* SQRT */
case 0x05: /* ABS */
case 0x06: /* MOV */
case 0x07: /* NEG */
case 0x08: /* ROUND.L */
case 0x09: /* TRUNC.L */
case 0x0a: /* CEIL.L */
case 0x0b: /* FLOOR.L */
case 0x0c: /* ROUND.W */
case 0x0d: /* TRUNC.W */
case 0x0e: /* CEIL.W */
case 0x0f: /* FLOOR.W */
case 0x20: /* CVT.S */
case 0x21: /* CVT.D */
case 0x24: /* CVT.W */
case 0x25: /* CVT.L */
desc->regin[1] |= REGFLAG_CPR1(FSREG);
desc->regout[1] |= REGFLAG_CPR1(FDREG);
return TRUE;
case 0x11: /* MOVT/F - MIPS IV */
if (mipsaa->flavor < MIPS3_TYPE_MIPS_IV)
return FALSE;
desc->regin[1] |= REGFLAG_CPR1(FSREG);
desc->regin[2] |= REGFLAG_FCC;
desc->regout[1] |= REGFLAG_CPR1(FDREG);
return TRUE;
case 0x30: case 0x38: /* C.F */
case 0x31: case 0x39: /* C.UN */
desc->regout[2] |= REGFLAG_FCC;
return TRUE;
case 0x32: case 0x3a: /* C.EQ */
case 0x33: case 0x3b: /* C.UEQ */
case 0x34: case 0x3c: /* C.OLT */
case 0x35: case 0x3d: /* C.ULT */
case 0x36: case 0x3e: /* C.OLE */
case 0x37: case 0x3f: /* C.ULE */
desc->regin[1] |= REGFLAG_CPR1(FSREG) | REGFLAG_CPR1(FTREG);
desc->regout[2] |= REGFLAG_FCC;
return TRUE;
}
return FALSE;
}
return FALSE;
}
bool mips3_frontend::describe(opcode_desc &desc, const opcode_desc *prev)
{
UINT32 op, opswitch;
// compute the physical PC
assert((desc.physpc & 3) == 0);
if (!mips3com_translate_address(&m_context, AS_PROGRAM, TRANSLATE_FETCH, &desc.physpc))
{
// uh-oh: a page fault; leave the description empty and just if this is the first instruction, leave it empty and
// mark as needing to validate; otherwise, just end the sequence here
desc.flags |= OPFLAG_VALIDATE_TLB | OPFLAG_CAN_CAUSE_EXCEPTION | OPFLAG_COMPILER_PAGE_FAULT | OPFLAG_VIRTUAL_NOOP | OPFLAG_END_SEQUENCE;
return true;
}
// fetch the opcode
assert((desc.physpc & 3) == 0);
op = desc.opptr.l[0] = m_context.direct->read_decrypted_dword(desc.physpc);
// all instructions are 4 bytes and default to a single cycle each
desc.length = 4;
desc.cycles = 1;
// parse the instruction
opswitch = op >> 26;
switch (opswitch)
{
case 0x00: // SPECIAL
return describe_special(op, desc);
case 0x01: // REGIMM
return describe_regimm(op, desc);
case 0x10: // COP0
return describe_cop0(op, desc);
case 0x11: // COP1
return describe_cop1(op, desc);
case 0x12: // COP2
return describe_cop2(op, desc);
case 0x13: // COP1X - MIPS IV
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
return describe_cop1x(op, desc);
case 0x1c: // IDT-specific opcodes: mad/madu/mul on R4640/4650, msub on RC32364
return describe_idt(op, desc);
case 0x02: // J
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = (desc.pc & 0xf0000000) | (LIMMVAL << 2);
desc.delayslots = 1;
return true;
case 0x03: // JAL
desc.regout[0] |= REGFLAG_R(31);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = (desc.pc & 0xf0000000) | (LIMMVAL << 2);
desc.delayslots = 1;
return true;
case 0x04: // BEQ
case 0x05: // BNE
case 0x14: // BEQL
case 0x15: // BNEL
if ((opswitch == 0x04 || opswitch == 0x14) && RSREG == RTREG)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
desc.skipslots = (opswitch & 0x10) ? 1 : 0;
return true;
case 0x06: // BLEZ
case 0x07: // BGTZ
case 0x16: // BLEZL
case 0x17: // BGTZL
if ((opswitch == 0x06 || opswitch == 0x16) && RSREG == 0)
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
desc.skipslots = (opswitch & 0x10) ? 1 : 0;
return true;
case 0x08: // ADDI
case 0x18: // DADDI
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x09: // ADDIU
case 0x0a: // SLTI
case 0x0b: // SLTIU
case 0x0c: // ANDI
case 0x0d: // ORI
case 0x0e: // XORI
case 0x19: // DADDIU
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x0f: // LUI
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x1a: // LDL
case 0x1b: // LDR
case 0x22: // LWL
case 0x26: // LWR
desc.regin[0] |= REGFLAG_R(RTREG);
case 0x20: // LB
case 0x21: // LH
case 0x23: // LW
case 0x24: // LBU
case 0x25: // LHU
case 0x27: // LWU
case 0x30: // LL
case 0x34: // LLD
case 0x37: // LD
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[0] |= REGFLAG_R(RTREG);
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x28: // SB
case 0x29: // SH
case 0x2a: // SWL
case 0x2b: // SW
case 0x2c: // SDL
case 0x2d: // SDR
case 0x2e: // SWR
case 0x3f: // SD
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x38: // SC
case 0x3c: // SCD
desc.regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc.regout[0] |= REGFLAG_R(RTREG);
desc.flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x31: // LWC1
case 0x35: // LDC1
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regout[1] |= REGFLAG_CPR1(RTREG);
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x39: // SWC1
case 0x3d: // SDC1
desc.regin[0] |= REGFLAG_R(RSREG);
desc.regin[1] |= REGFLAG_CPR1(RTREG);
desc.flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x32: // LWC2
case 0x36: // LDC2
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x3a: // SWC2
case 0x3e: // SDC2
desc.regin[0] |= REGFLAG_R(RSREG);
desc.flags |= OPFLAG_WRITES_MEMORY | OPFLAG_CAN_CAUSE_EXCEPTION;
return true;
case 0x33: // PREF
if (m_context.flavor < MIPS3_TYPE_MIPS_IV)
return false;
case 0x2f: // CACHE
// effective no-op
return true;
}
return false;
}
bool mips3_frontend::describe_cop0(UINT32 op, opcode_desc &desc)
{
// any COP0 instruction can potentially cause an exception
desc.flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: // MFCz
case 0x01: // DMFCz
if (RDREG == COP0_Count)
desc.cycles += MIPS3_COUNT_READ_CYCLES;
if (RDREG == COP0_Cause)
desc.cycles += MIPS3_CAUSE_READ_CYCLES;
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x02: // CFCz
desc.regout[0] |= REGFLAG_R(RTREG);
return true;
case 0x04: // MTCz
case 0x05: // DMTCz
case 0x06: // CTCz
desc.regin[0] |= REGFLAG_R(RTREG);
if (RSREG == 0x04 || RSREG == 0x05)
{
if (RDREG == COP0_Cause)
desc.flags |= OPFLAG_CAN_TRIGGER_SW_INT;
if (RDREG == COP0_Status)
desc.flags |= OPFLAG_CAN_EXPOSE_EXTERNAL_INT | OPFLAG_CAN_CHANGE_MODES | OPFLAG_END_SEQUENCE;
}
return true;
case 0x08: // BC
switch (RTREG)
{
case 0x00: // BCzF
case 0x01: // BCzT
desc.flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc.targetpc = desc.pc + 4 + (SIMMVAL << 2);
desc.delayslots = 1;
return true;
}
return false;
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: // COP
switch (op & 0x01ffffff)
{
case 0x01: // TLBR
case 0x08: // TLBP
case 0x20: // WAIT
return true;
case 0x02: // TLBWI
case 0x06: // TLBWR
desc.flags |= OPFLAG_MODIFIES_TRANSLATION;
return true;
case 0x18: // ERET
desc.flags |= OPFLAG_CAN_CHANGE_MODES | OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
return true;
}
return false;
}
return false;
}
bool sh2_frontend::describe_group_4(opcode_desc &desc, const opcode_desc *prev, UINT16 opcode)
{
switch (opcode & 0x3F)
{
case 0x00: // SHLL(Rn);
case 0x01: // SHLR(Rn);
case 0x04: // ROTL(Rn);
case 0x05: // ROTR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
return true;
case 0x02: // STSMMACH(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_MACH;
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x03: // STCMSR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.cycles = 2;
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x06: // LDSMMACH(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_MACH;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x07: // LDCMSR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
desc.cycles = 3;
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_CAN_EXPOSE_EXTERNAL_INT | OPFLAG_END_SEQUENCE;
return true;
case 0x08: // SHLL2(Rn);
case 0x09: // SHLR2(Rn);
case 0x18: // SHLL8(Rn);
case 0x19: // SHLR8(Rn);
case 0x28: // SHLL16(Rn);
case 0x29: // SHLR16(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
return true;
case 0x0a: // LDSMACH(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_MACH;
return true;
case 0x0b: // JSR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_PR;
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x0e: // LDCSR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
desc.flags |= OPFLAG_CAN_EXPOSE_EXTERNAL_INT | OPFLAG_END_SEQUENCE;
return true;
case 0x0f: // MAC_W(Rm, Rn);
case 0x1f: // MAC_W(Rm, Rn);
case 0x2f: // MAC_W(Rm, Rn);
case 0x3f: // MAC_W(Rm, Rn);
desc.regin[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_MACL | REGFLAG_MACH;
desc.regout[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_MACL | REGFLAG_MACH;
desc.cycles = 3;
return true;
case 0x10: // DT(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_SR;
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
return true;
case 0x11: // CMPPZ(Rn);
case 0x15: // CMPPL(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_SR;
desc.regout[1] |= REGFLAG_SR;
return true;
case 0x12: // STSMMACL(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_MACL;
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x13: // STCMGBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_GBR;
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x16: // LDSMMACL(Rn);
desc.regin[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rm) | REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_MACL;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x17: // LDCMGBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_GBR;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x1a: // LDSMACL(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_MACL;
return true;
case 0x1b: // TAS(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_SR;
desc.regout[1] |= REGFLAG_SR;
desc.cycles = 4;
desc.flags |= OPFLAG_READS_MEMORY | OPFLAG_WRITES_MEMORY;
return true;
case 0x1e: // LDCGBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_GBR;
return true;
case 0x20: // SHAL(Rn);
case 0x21: // SHAR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
return true;
case 0x22: // STSMPR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_PR;
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x23: // STCMVBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_VBR;
desc.regout[0] |= REGFLAG_R(Rn);
desc.flags |= OPFLAG_WRITES_MEMORY;
return true;
case 0x24: // ROTCL(Rn);
case 0x25: // ROTCR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regin[1] |= REGFLAG_SR;
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_SR;
return true;
case 0x26: // LDSMPR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_PR;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x27: // LDCMVBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_VBR;
desc.flags |= OPFLAG_READS_MEMORY;
return true;
case 0x2a: // LDSPR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_PR;
return true;
case 0x2b: // JMP(Rm);
desc.regin[0] |= REGFLAG_R(Rm);
desc.flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc.targetpc = BRANCH_TARGET_DYNAMIC;
desc.delayslots = 1;
return true;
case 0x2e: // LDCVBR(Rn);
desc.regin[0] |= REGFLAG_R(Rn);
desc.regout[1] |= REGFLAG_VBR;
return true;
case 0x0c: // NOP();
case 0x0d: // NOP();
case 0x14: // NOP();
case 0x1c: // NOP();
case 0x1d: // NOP();
case 0x2c: // NOP();
case 0x2d: // NOP();
case 0x30: // NOP();
case 0x31: // NOP();
case 0x32: // NOP();
case 0x33: // NOP();
case 0x34: // NOP();
case 0x35: // NOP();
case 0x36: // NOP();
case 0x37: // NOP();
case 0x38: // NOP();
case 0x39: // NOP();
case 0x3a: // NOP();
case 0x3b: // NOP();
case 0x3c: // NOP();
case 0x3d: // NOP();
case 0x3e: // NOP();
return true;
}
return false;
}
int rspfe_describe(void *param, opcode_desc *desc, const opcode_desc *prev)
{
rsp_state *rsp = (rsp_state *)param;
UINT32 op, opswitch;
/* fetch the opcode */
op = desc->opptr.l[0] = memory_decrypted_read_dword(rsp->program, desc->physpc | 0x1000);
/* all instructions are 4 bytes and default to a single cycle each */
desc->length = 4;
desc->cycles = 1;
/* parse the instruction */
opswitch = op >> 26;
switch (opswitch)
{
case 0x00: /* SPECIAL */
return describe_instruction_special(rsp, op, desc);
case 0x01: /* REGIMM */
return describe_instruction_regimm(rsp, op, desc);
case 0x10: /* COP0 */
return describe_instruction_cop0(rsp, op, desc);
case 0x12: /* COP2 */
return describe_instruction_cop2(rsp, op, desc);
case 0x02: /* J */
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = ((LIMMVAL << 2) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
return TRUE;
case 0x03: /* JAL */
desc->regout[0] |= REGFLAG_R(31);
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
desc->targetpc = ((LIMMVAL << 2) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
return TRUE;
case 0x04: /* BEQ */
case 0x05: /* BNE */
if ((opswitch == 0x04 || opswitch == 0x14) && RSREG == RTREG)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = ((desc->pc + 4 + (SIMMVAL << 2)) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
desc->skipslots = (opswitch & 0x10) ? 1 : 0;
return TRUE;
case 0x06: /* BLEZ */
case 0x07: /* BGTZ */
if ((opswitch == 0x06 || opswitch == 0x16) && RSREG == 0)
desc->flags |= OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
else
{
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
}
desc->targetpc = ((desc->pc + 4 + (SIMMVAL << 2)) & 0x00000fff) | 0x1000;
desc->delayslots = 1;
desc->skipslots = (opswitch & 0x10) ? 1 : 0;
return TRUE;
case 0x08: /* ADDI */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x09: /* ADDIU */
case 0x0a: /* SLTI */
case 0x0b: /* SLTIU */
case 0x0c: /* ANDI */
case 0x0d: /* ORI */
case 0x0e: /* XORI */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x0f: /* LUI */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x20: /* LB */
case 0x21: /* LH */
case 0x23: /* LW */
case 0x24: /* LBU */
case 0x25: /* LHU */
case 0x27: /* LWU */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->regout[0] |= REGFLAG_R(RTREG);
desc->flags |= OPFLAG_READS_MEMORY;
return TRUE;
case 0x28: /* SB */
case 0x29: /* SH */
case 0x2b: /* SW */
desc->regin[0] |= REGFLAG_R(RSREG) | REGFLAG_R(RTREG);
desc->flags |= OPFLAG_WRITES_MEMORY;
return TRUE;
case 0x32: /* LWC2 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_READS_MEMORY;
return TRUE;
case 0x3a: /* SWC2 */
desc->regin[0] |= REGFLAG_R(RSREG);
desc->flags |= OPFLAG_WRITES_MEMORY;
return TRUE;
}
return FALSE;
}
static int describe_instruction_cop0(mips3_state *mipsaa, UINT32 op, opcode_desc *desc)
{
/* any COP0 instruction can potentially cause an exception */
desc->flags |= OPFLAG_CAN_CAUSE_EXCEPTION;
switch (RSREG)
{
case 0x00: /* MFCz */
case 0x01: /* DMFCz */
if (RDREG == COP0_Count)
desc->cycles += MIPS3_COUNT_READ_CYCLES;
if (RDREG == COP0_Cause)
desc->cycles += MIPS3_CAUSE_READ_CYCLES;
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x02: /* CFCz */
desc->regout[0] |= REGFLAG_R(RTREG);
return TRUE;
case 0x04: /* MTCz */
case 0x05: /* DMTCz */
case 0x06: /* CTCz */
desc->regin[0] |= REGFLAG_R(RTREG);
if (RSREG == 0x04 || RSREG == 0x05)
{
if (RDREG == COP0_Cause)
desc->flags |= OPFLAG_CAN_TRIGGER_SW_INT;
if (RDREG == COP0_Status)
desc->flags |= OPFLAG_CAN_EXPOSE_EXTERNAL_INT | OPFLAG_CAN_CHANGE_MODES | OPFLAG_END_SEQUENCE;
}
return TRUE;
case 0x08: /* BC */
switch (RTREG)
{
case 0x00: /* BCzF */
case 0x01: /* BCzT */
desc->flags |= OPFLAG_IS_CONDITIONAL_BRANCH;
desc->targetpc = desc->pc + 4 + (SIMMVAL << 2);
desc->delayslots = 1;
return TRUE;
}
return FALSE;
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: /* COP */
switch (op & 0x01ffffff)
{
case 0x01: /* TLBR */
case 0x08: /* TLBP */
case 0x20: /* WAIT */
return TRUE;
case 0x02: /* TLBWI */
case 0x06: /* TLBWR */
desc->flags |= OPFLAG_MODIFIES_TRANSLATION;
return TRUE;
case 0x18: /* ERET */
desc->flags |= OPFLAG_CAN_CHANGE_MODES | OPFLAG_IS_UNCONDITIONAL_BRANCH | OPFLAG_END_SEQUENCE;
return TRUE;
}
return FALSE;
}
return FALSE;
}
