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OIDecoder.cpp
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OIDecoder.cpp
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#include "OIDecoder.hpp"
using namespace dbt::OIDecoder;
constexpr uint8_t getCount(Word W) {
return (W.asI_) & 0xFF;
}
constexpr uint8_t getIndex(Word W) {
return (W.asI_ >> 8) & 0x3F;
}
constexpr uint16_t getPL12(Word W) {
return (W.asI_ >> 14) & 0xFFF;
}
constexpr uint8_t getRS(Word W) {
return (W.asI_ >> 6) & 0x3F;
}
constexpr uint8_t getRT(Word W) {
return W.asI_ & 0x3F;
}
constexpr uint8_t getRD(Word W) {
return (W.asI_ >> 12) & 0x3F;
}
constexpr uint8_t getRV(Word W) {
return (W.asI_ >> 18) & 0x3F;
}
static int16_t getImm(Word W) {
uint16_t x = (W.asI_ >> 6) & 0x3FFF;
return (x & 0x2000) ? (x | 0xc000) : x;
}
static int16_t getHalfword(Word W) {
uint16_t x = (W.asI_) & 0x3FFF;
return (x & 0x2000) ? (x | 0xc000) : x;
}
static int16_t getImm1(Word W) {
uint16_t x = (W.asI_ >> 12) & 0x3FFF;
return (x & 0x2000) ? (x | 0xc000) : x;
}
constexpr uint32_t getPL18(Word W) {
return W.asI_ & 0x3FFFF;
}
constexpr uint32_t getAddr(Word W) {
return W.asI_ & 0xFFFFF;
}
constexpr uint32_t getLAddr(Word W) {
return W.asI_ & 0x3FFFFFF;
}
EncodingType dbt::OIDecoder::getEncodingType(OIInstType InstType) {
switch(InstType) {
case OIInstType::Andi:
case OIInstType::Stb:
case OIInstType::Ldbu:
case OIInstType::Ldb:
case OIInstType::Ldw:
case OIInstType::Addi:
case OIInstType::Stw:
case OIInstType::Xori:
case OIInstType::Sltiu:
case OIInstType::Slti:
case OIInstType::Jeqz:
case OIInstType::Jeq:
case OIInstType::Jnez:
case OIInstType::Jne:
case OIInstType::Ori:
case OIInstType::Sth:
case OIInstType::Ldh:
case OIInstType::Ldhu:
case OIInstType::Sdc1:
case OIInstType::Ldc1:
case OIInstType::Lwc1:
case OIInstType::Swc1:
return EncodingType::PL26i;
case OIInstType::Mulu:
case OIInstType::Mul:
case OIInstType::Div:
case OIInstType::Mod:
case OIInstType::Divu:
case OIInstType::Modu:
case OIInstType::Maddd:
case OIInstType::Madds:
case OIInstType::Msubs:
case OIInstType::Msubd:
case OIInstType::Ext:
return EncodingType::PL24;
case OIInstType::Ldihi:
return EncodingType::PL18i;
case OIInstType::Add:
case OIInstType::Sub:
case OIInstType::Slt:
case OIInstType::Sltu:
case OIInstType::And:
case OIInstType::Or:
case OIInstType::Nor:
case OIInstType::Shl:
case OIInstType::Shlr:
case OIInstType::Shr:
case OIInstType::Asr:
case OIInstType::Asrr:
case OIInstType::Movn:
case OIInstType::Movz:
case OIInstType::Movzd:
case OIInstType::Movzs:
case OIInstType::Xor:
case OIInstType::Adds:
case OIInstType::Addd:
case OIInstType::Lwxc1:
case OIInstType::Swxc1:
case OIInstType::Muls:
case OIInstType::Muld:
case OIInstType::Divs:
case OIInstType::Divd:
case OIInstType::Subd:
case OIInstType::Subs:
case OIInstType::Sdxc1:
case OIInstType::Ldxc1:
case OIInstType::Shrr:
case OIInstType::Ror:
return EncodingType::PL18;
case OIInstType::Jlez:
case OIInstType::Jgtz:
case OIInstType::Jltz:
case OIInstType::Jgez:
case OIInstType::Ldi:
return EncodingType::PL20;
case OIInstType::Ijmphi:
return EncodingType::PL20i;
case OIInstType::Call:
return EncodingType::PL26c;
case OIInstType::Jumpr:
return EncodingType::PL6;
case OIInstType::Jump:
return EncodingType::PL26j;
case OIInstType::Ijmp:
return EncodingType::PL26ij;
case OIInstType::Seh:
case OIInstType::Seb:
case OIInstType::Callr:
case OIInstType::Mtlc1:
case OIInstType::Mthc1:
case OIInstType::Ceqs:
case OIInstType::Ceqd:
case OIInstType::Movd:
case OIInstType::Movs:
case OIInstType::Mtc1:
case OIInstType::Mfc1:
case OIInstType::Truncws:
case OIInstType::Truncwd:
case OIInstType::Cvtsw:
case OIInstType::Cvtdw:
case OIInstType::Cvtds:
case OIInstType::Cvtsd:
case OIInstType::Coltd:
case OIInstType::Colts:
case OIInstType::Coled:
case OIInstType::Coles:
case OIInstType::Culed:
case OIInstType::Cules:
case OIInstType::Cults:
case OIInstType::Cultd:
case OIInstType::Cund:
case OIInstType::Cuns:
case OIInstType::Negd:
case OIInstType::Negs:
case OIInstType::Mflc1:
case OIInstType::Mfhc1:
case OIInstType::Movf:
case OIInstType::Movfd:
case OIInstType::Movfs:
case OIInstType::Movtd:
case OIInstType::Movts:
case OIInstType::Movt:
case OIInstType::Movnd:
case OIInstType::Movns:
case OIInstType::Absd:
case OIInstType::Abss:
case OIInstType::Sqrtd:
case OIInstType::Sqrts:
case OIInstType::Cueqd:
case OIInstType::Cueqs:
return EncodingType::PL12;
case OIInstType::Bc1f:
case OIInstType::Bc1t:
return EncodingType::PL16;
case OIInstType::Syscall:
case OIInstType::Nop:
case OIInstType::Null:
return EncodingType::PL0;
}
std::cout << "Dammit! We have a bug on Encoding types!\n";
return EncodingType::PL0;
}
extern void dbt::OIDecoder::fillFields(OIInst& I, EncodingType E, Word W) {
switch (E) {
case EncodingType::PL26i:
I.Imm = getImm1(W);
I.RS = getRS(W);
I.RT = getRT(W);
#ifdef PRINTREG
//std::cout << "RS: " << I.RS << "; RT: " << I.RT << "; Imm: " << I.Imm << ";\n";
#endif
break;
case EncodingType::PL24:
I.RV = getRV(W);
I.RD = getRD(W);
I.RS = getRS(W);
I.RT = getRT(W);
break;
case EncodingType::PL18i:
I.Addrs = getPL18(W);
break;
case EncodingType::PL18:
I.RS = getRS(W);
I.RT = getRT(W);
I.RD = getRD(W);
break;
case EncodingType::PL20:
I.RT = getRT(W);
I.Imm = getImm(W);
break;
case EncodingType::PL20i:
I.Addrs = getAddr(W);
break;
case EncodingType::PL26c:
I.Addrs = getAddr(W);
break;
case EncodingType::PL6:
I.RT = getRT(W);
break;
case EncodingType::PL26j:
I.Addrs = getLAddr(W);
break;
case EncodingType::PL26ij:
I.RS = getCount(W);
I.RT = getIndex(W);
I.Imm = getPL12(W);
break;
case EncodingType::PL12:
I.RS = getRS(W);
I.RT = getRT(W);
break;
case EncodingType::PL16:
I.Imm = getHalfword(W);
break;
case EncodingType::PL0:
break;
default:
std::cout << "It may seem unbelievable, but we haven't implemented this encoding type!\n";
break;
}
}
bool CallZero;
OIInst dbt::OIDecoder::decode(uint32_t CodedInst) {
Word W;
W.asI_ = CodedInst;
uint8_t Op = W.asI_ >> 26;
constexpr unsigned OpMask = 0x3FFFFFF;
OIInst I;
I.Type = OIInstType::Null;
if (CodedInst == 0) {
I.Type = OIInstType::Nop;
return I;
}
uint8_t Ext;
switch(Op) {
case 0b000000:
I.Type = OIInstType::Jump;
break;
case 0b000001:
I.Type = OIInstType::Call;
break;
case 0b000011:
I.Type = OIInstType::Ldbu;
break;
case 0b000101:
I.Type = OIInstType::Ldhu;
break;
case 0b000110:
I.Type = OIInstType::Ldw;
break;
case 0b001001:
I.Type = OIInstType::Stb;
break;
case 0b001010:
I.Type = OIInstType::Sth;
break;
case 0b001011:
I.Type = OIInstType::Stw;
break;
case 0b001110:
I.Type = OIInstType::Addi;
break;
case 0b010010:
I.Type = OIInstType::Andi;
break;
case 0b011001:
I.Type = OIInstType::Sdc1;
break;
case 0b011011:
I.Type = OIInstType::Swc1;
break;
case 0b011010:
I.Type = OIInstType::Ldc1;
break;
case 0b011100:
I.Type = OIInstType::Lwc1;
break;
case 0b100101:
I.Type = OIInstType::Mulu;
break;
case 0b100110:
I.Type = OIInstType::Ijmp;
break;
case 0b100010:
Ext = (W.asI_ & OpMask) >> 12;
if (Ext == 0b0 ) I.Type = OIInstType::Callr;
if (Ext == 0b11 ) I.Type = OIInstType::Seb;
if (Ext == 0b100 ) I.Type = OIInstType::Seh;
if (Ext == 0b101 ) I.Type = OIInstType::Absd;
if (Ext == 0b110 ) I.Type = OIInstType::Abss;
if (Ext == 0b111 ) I.Type = OIInstType::Ceqd;
if (Ext == 0b1000 ) I.Type = OIInstType::Ceqs;
if (Ext == 0b1001 ) I.Type = OIInstType::Coled;
if (Ext == 0b1010 ) I.Type = OIInstType::Coles;
if (Ext == 0b1011 ) I.Type = OIInstType::Coltd;
if (Ext == 0b1100 ) I.Type = OIInstType::Colts;
if (Ext == 0b1101 ) I.Type = OIInstType::Cueqd;
if (Ext == 0b1111 ) I.Type = OIInstType::Culed;
if (Ext == 0b10000 ) I.Type = OIInstType::Cules;
if (Ext == 0b10001 ) I.Type = OIInstType::Cultd;
if (Ext == 0b10010 ) I.Type = OIInstType::Cults;
if (Ext == 0b10011 ) I.Type = OIInstType::Cund;
if (Ext == 0b10100 ) I.Type = OIInstType::Cuns;
if (Ext == 0b10101 ) I.Type = OIInstType::Cvtsd;
if (Ext == 0b10110 ) I.Type = OIInstType::Cvtds;
if (Ext == 0b10111 ) I.Type = OIInstType::Cvtdw;
if (Ext == 0b11000 ) I.Type = OIInstType::Cvtsw;
if (Ext == 0b11001 ) I.Type = OIInstType::Mfc1;
if (Ext == 0b11010 ) I.Type = OIInstType::Movd;
if (Ext == 0b11011 ) I.Type = OIInstType::Movs;
if (Ext == 0b11100 ) I.Type = OIInstType::Mtc1;
if (Ext == 0b11101 ) I.Type = OIInstType::Negd;
if (Ext == 0b11110 ) I.Type = OIInstType::Negs;
if (Ext == 0b11111 ) I.Type = OIInstType::Truncwd;
if (Ext == 0b100000) I.Type = OIInstType::Truncws;
if (Ext == 0b100001) I.Type = OIInstType::Sqrtd;
if (Ext == 0b100010) I.Type = OIInstType::Sqrts;
if (Ext == 0b100011) I.Type = OIInstType::Movtd;
if (Ext == 0b100101) I.Type = OIInstType::Movfd;
if (Ext == 0b100110) I.Type = OIInstType::Movfs;
if (Ext == 0b100111) I.Type = OIInstType::Movf;
if (Ext == 0b101000) I.Type = OIInstType::Movt;
if (Ext == 0b100100) I.Type = OIInstType::Movts;
if (Ext == 0b101001) I.Type = OIInstType::Mfhc1;
if (Ext == 0b101010) I.Type = OIInstType::Mthc1;
if (Ext == 0b110001) I.Type = OIInstType::Mflc1;
if (Ext == 0b110010) I.Type = OIInstType::Mtlc1;
break;
case 0b100000:
Ext = (W.asI_ & OpMask) >> 18;
if (Ext == 0b0 ) I.Type = OIInstType::Add;
if (Ext == 0b1 ) I.Type = OIInstType::Ldihi;
if (Ext == 0b10 ) I.Type = OIInstType::Sub;
if (Ext == 0b100 ) I.Type = OIInstType::Slt;
if (Ext == 0b101 ) I.Type = OIInstType::Sltu;
if (Ext == 0b110 ) I.Type = OIInstType::And;
if (Ext == 0b111 ) I.Type = OIInstType::Or;
if (Ext == 0b1000 ) I.Type = OIInstType::Xor;
if (Ext == 0b1001 ) I.Type = OIInstType::Nor;
if (Ext == 0b1010 ) I.Type = OIInstType::Shl;
if (Ext == 0b1011 ) I.Type = OIInstType::Shr;
if (Ext == 0b1100 ) I.Type = OIInstType::Asr;
if (Ext == 0b1101 ) I.Type = OIInstType::Shlr;
if (Ext == 0b1110 ) I.Type = OIInstType::Shrr;
if (Ext == 0b1111 ) I.Type = OIInstType::Asrr;
if (Ext == 0b10000 ) I.Type = OIInstType::Movz;
if (Ext == 0b10001 ) I.Type = OIInstType::Movn;
if (Ext == 0b10010 ) I.Type = OIInstType::Ror;
if (Ext == 0b10100 ) I.Type = OIInstType::Addd;
if (Ext == 0b10101 ) I.Type = OIInstType::Adds;
if (Ext == 0b10110 ) I.Type = OIInstType::Divd;
if (Ext == 0b10111 ) I.Type = OIInstType::Divs;
if (Ext == 0b11000 ) I.Type = OIInstType::Muld;
if (Ext == 0b11001 ) I.Type = OIInstType::Muls;
if (Ext == 0b11010 ) I.Type = OIInstType::Subd;
if (Ext == 0b11011 ) I.Type = OIInstType::Subs;
if (Ext == 0b11100 ) I.Type = OIInstType::Movzd;
if (Ext == 0b11101 ) I.Type = OIInstType::Movzs;
if (Ext == 0b11110 ) I.Type = OIInstType::Movnd;
if (Ext == 0b11111 ) I.Type = OIInstType::Movns;
if (Ext == 0b100000) I.Type = OIInstType::Ldxc1;
if (Ext == 0b100001) I.Type = OIInstType::Sdxc1;
if (Ext == 0b100010) I.Type = OIInstType::Lwxc1;
if (Ext == 0b100011) I.Type = OIInstType::Swxc1;
break;
case 0b100001:
Ext = (W.asI_ & OpMask) >> 16;
if (Ext == 0b0 ) I.Type = OIInstType::Bc1t;
if (Ext == 0b10) I.Type = OIInstType::Bc1f;
break;
case 0b11110:
Ext = (W.asI_ & OpMask) >> 24;
if (Ext == 0b0 ) I.Type = OIInstType::Maddd;
if (Ext == 0b01) I.Type = OIInstType::Madds;
if (Ext == 0b10) I.Type = OIInstType::Msubd;
if (Ext == 0b11) I.Type = OIInstType::Msubs;
break;
case 0b11111:
Ext = (W.asI_ & OpMask) >> 20;
if (Ext == 0b0 ) I.Type = OIInstType::Jlez;
if (Ext == 0b1 ) I.Type = OIInstType::Jgtz;
if (Ext == 0b10 ) I.Type = OIInstType::Jltz;
if (Ext == 0b11 ) I.Type = OIInstType::Jgez;
if (Ext == 0b100 ) I.Type = OIInstType::Ldi;
if (Ext == 0b10000) I.Type = OIInstType::Ijmphi;
break;
case 0b100011:
I.Type = OIInstType::Jumpr;
break;
case 0b10100:
I.Type = OIInstType::Xori;
break;
case 0b10001:
I.Type = OIInstType::Sltiu;
break;
case 0b10000:
I.Type = OIInstType::Slti;
break;
case 0b10101:
if (getRT(W) == 0)
I.Type = OIInstType::Jeqz;
else
I.Type = OIInstType::Jeq;
break;
case 0b10110:
if (getRT(W) == 0)
I.Type = OIInstType::Jnez;
else
I.Type = OIInstType::Jne;
break;
case 0b011101:
Ext = (W.asI_ & OpMask) >> 24;
if (Ext == 0b00) I.Type = OIInstType::Mul;
if (Ext == 0b01) {
if (getRD(W) != 0)
I.Type = OIInstType::Div;
if (getRV(W) != 0)
I.Type = OIInstType::Mod;
}
if (Ext == 0b10) {
if (getRD(W) != 0)
I.Type = OIInstType::Divu;
if (getRV(W) != 0)
I.Type = OIInstType::Modu;
}
if (Ext == 0b11) I.Type = OIInstType::Ext;
break;
case 0b100100:
I.Type = OIInstType::Syscall;
break;
case 0b10011: // FIXME: Is this a UImm?
I.Type = OIInstType::Ori;
break;
case 0b10:
I.Type = OIInstType::Ldb;
break;
case 0b100:
I.Type = OIInstType::Ldh;
break;
default:
I.Type = OIInstType::Null;
break;
}
if (I.Type == OIInstType::Null) {
std::cout << "Houston: we have a problem! Inst (" << std::hex << CodedInst << ") not implemented! \n";
exit(1);
}
dbt::OIDecoder::fillFields(I, dbt::OIDecoder::getEncodingType(I.Type), W);
if (!CallZero && I.Type == Call && (I.Addrs << 2) == 0) {
std::cerr << "Pay attention! Something must have been linked wrongly, a call 0 was found! Maybe a -lm missing?\n";
CallZero = true;
}
return I;
}
std::array<uint32_t, 2> dbt::OIDecoder::getPossibleTargets(uint32_t PC, OIInst Inst) {
switch (Inst.Type) {
case dbt::OIDecoder::Jne:
case dbt::OIDecoder::Jeqz:
case dbt::OIDecoder::Jlez:
case dbt::OIDecoder::Jgez:
case dbt::OIDecoder::Jltz:
case dbt::OIDecoder::Jnez:
case dbt::OIDecoder::Jgtz:
case dbt::OIDecoder::Jeq:
case dbt::OIDecoder::Bc1f:
case dbt::OIDecoder::Bc1t:
return {(PC + (Inst.Imm << 2) + 4), PC + 4};
case dbt::OIDecoder::Jump:
case dbt::OIDecoder::Call:
return {(PC & 0xF0000000) | (Inst.Addrs << 2), 0};
default:
return {PC+4, PC+4};
}
return {PC+4, PC+4};
}
bool dbt::OIDecoder::isControlFlowInst(OIInst Inst) {
auto T = dbt::OIDecoder::getPossibleTargets(1, Inst);
if (T[0] == 5 && T[1] == 5)
return false;
return true;
}
bool dbt::OIDecoder::isIndirectBranch(OIInst Inst) {
switch (Inst.Type) {
case dbt::OIDecoder::Callr:
case dbt::OIDecoder::Ijmp:
case dbt::OIDecoder::Jumpr:
return true;
default:
return false;
}
}