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exchain
nebula
Commits
69f9385d
Commit
69f9385d
authored
Oct 04, 2021
by
George Hotz
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111khz
parent
7702cf72
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MIPS.sol
contracts/MIPS.sol
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contracts/MIPS.sol
View file @
69f9385d
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@@ -211,9 +211,6 @@ contract MIPS {
// ALU
uint32 val = execute(insn, rs, rt, mem);
// jumps (with branch delay slot)
// nothing is written to the state by this time
if (opcode == 0 && func >= 8 && func < 0x1c) {
if (func == 8 || func == 9) {
// jr/jalr
...
...
@@ -260,7 +257,6 @@ contract MIPS {
}
// lo/hi writeback
// can't stepNextPC after this
if (func >= 0x18 && func < 0x1c) {
stateHash = WriteMemory(stateHash, REG_HI, hi);
storeAddr = REG_LO;
...
...
@@ -288,70 +284,74 @@ contract MIPS {
uint32 func = insn & 0x3f; // 6-bits
// TODO: deref the immed into a register
// transform ArithLogI
// TODO: replace with table
if (opcode >= 8 && opcode < 0xF) {
if (opcode == 8) { func = 0x20; } // addi
else if (opcode == 9) { func = 0x21; } // addiu
else if (opcode == 0xa) { func = 0x2a; } // slti
else if (opcode == 0xb) { func = 0x2B; } // sltiu
else if (opcode == 0xc) { func = 0x24; } // andi
else if (opcode == 0xd) { func = 0x25; } // ori
else if (opcode == 0xe) { func = 0x26; } // xori
opcode = 0;
}
if (opcode < 0x20) {
// transform ArithLogI
// TODO: replace with table
if (opcode >= 8 && opcode < 0xF) {
if (opcode == 8) { func = 0x20; } // addi
else if (opcode == 9) { func = 0x21; } // addiu
else if (opcode == 0xa) { func = 0x2a; } // slti
else if (opcode == 0xb) { func = 0x2B; } // sltiu
else if (opcode == 0xc) { func = 0x24; } // andi
else if (opcode == 0xd) { func = 0x25; } // ori
else if (opcode == 0xe) { func = 0x26; } // xori
opcode = 0;
}
// 0 is opcode SPECIAL
if (opcode == 0) {
uint32 shamt = (insn >> 6) & 0x1f;
if (func < 0x20) {
if (func >= 0x08) { return rs; // jr/jalr/div + others
// Shift and ShiftV
} else if (func == 0x00) { return rt << shamt; // sll
} else if (func == 0x02) { return rt >> shamt; // srl
} else if (func == 0x03) { return SE(rt >> shamt, 32-shamt); // sra
} else if (func == 0x04) { return rt << (rs&0x1F); // sllv
} else if (func == 0x06) { return rt >> (rs&0x1F); // srlv
} else if (func == 0x07) { return SE(rt >> rs, 32-rs); // srav
// 0 is opcode SPECIAL
if (opcode == 0) {
uint32 shamt = (insn >> 6) & 0x1f;
if (func < 0x20) {
if (func >= 0x08) { return rs; // jr/jalr/div + others
// Shift and ShiftV
} else if (func == 0x00) { return rt << shamt; // sll
} else if (func == 0x02) { return rt >> shamt; // srl
} else if (func == 0x03) { return SE(rt >> shamt, 32-shamt); // sra
} else if (func == 0x04) { return rt << (rs&0x1F); // sllv
} else if (func == 0x06) { return rt >> (rs&0x1F); // srlv
} else if (func == 0x07) { return SE(rt >> rs, 32-rs); // srav
}
}
// 0x10-0x13 = mfhi, mthi, mflo, mtlo
// R-type (ArithLog)
if (func == 0x20 || func == 0x21) { return rs+rt; // add or addu
} else if (func == 0x22 || func == 0x23) { return rs-rt; // sub or subu
} else if (func == 0x24) { return rs&rt; // and
} else if (func == 0x25) { return (rs|rt); // or
} else if (func == 0x26) { return (rs^rt); // xor
} else if (func == 0x27) { return ~(rs|rt); // nor
} else if (func == 0x2a) {
return int32(rs)<int32(rt) ? 1 : 0; // slt
} else if (func == 0x2B) {
return rs<rt ? 1 : 0; // sltu
}
} else if (opcode == 0xf) { return rt<<16; // lui
} else if (opcode == 0x1c) { // SPECIAL2
if (func == 2) return uint32(int32(rs)*int32(rt)); // mul
if (func == 0x20 || func == 0x21) { // clo
if (func == 0x20) rs = ~rs;
uint32 i = 0; while (rs&0x80000000 != 0) { i++; rs <<= 1; } return i;
}
}
// 0x10-0x13 = mfhi, mthi, mflo, mtlo
// R-type (ArithLog)
if (func == 0x20 || func == 0x21) { return rs+rt; // add or addu
} else if (func == 0x22 || func == 0x23) { return rs-rt; // sub or subu
} else if (func == 0x24) { return rs&rt; // and
} else if (func == 0x25) { return (rs|rt); // or
} else if (func == 0x26) { return (rs^rt); // xor
} else if (func == 0x27) { return ~(rs|rt); // nor
} else if (func == 0x2a) {
return int32(rs)<int32(rt) ? 1 : 0; // slt
} else if (func == 0x2B) {
return rs<rt ? 1 : 0; // sltu
}
} else if (opcode == 0xf) { return rt<<16; // lui
} else if (opcode == 0x1c) { // SPECIAL2
if (func == 2) return uint32(int32(rs)*int32(rt)); // mul
if (func == 0x20 || func == 0x21) { // clo
if (func == 0x20) rs = ~rs;
uint32 i = 0; while (rs&0x80000000 != 0) { i++; rs <<= 1; } return i;
} else if (opcode < 0x28) {
if (opcode == 0x20) { // lb
return SE((mem >> (24-(rs&3)*8)) & 0xFF, 8);
} else if (opcode == 0x21) { // lh
return SE((mem >> (16-(rs&2)*8)) & 0xFFFF, 16);
} else if (opcode == 0x22) { // lwl
uint32 val = mem << ((rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) << ((rs&3)*8);
return (rt & ~mask) | val;
} else if (opcode == 0x23) { return mem; // lw
} else if (opcode == 0x24) { // lbu
return (mem >> (24-(rs&3)*8)) & 0xFF;
} else if (opcode == 0x25) { // lhu
return (mem >> (16-(rs&2)*8)) & 0xFFFF;
} else if (opcode == 0x26) { // lwr
uint32 val = mem >> (24-(rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) >> (24-(rs&3)*8);
return (rt & ~mask) | val;
}
} else if (opcode == 0x20) { // lb
return SE((mem >> (24-(rs&3)*8)) & 0xFF, 8);
} else if (opcode == 0x21) { // lh
return SE((mem >> (16-(rs&2)*8)) & 0xFFFF, 16);
} else if (opcode == 0x22) { // lwl
uint32 val = mem << ((rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) << ((rs&3)*8);
return (rt & ~mask) | val;
} else if (opcode == 0x23 || opcode == 0x30) { return mem; // lw (or ll)
} else if (opcode == 0x24) { // lbu
return (mem >> (24-(rs&3)*8)) & 0xFF;
} else if (opcode == 0x25) { // lhu
return (mem >> (16-(rs&2)*8)) & 0xFFFF;
} else if (opcode == 0x26) { // lwr
uint32 val = mem >> (24-(rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) >> (24-(rs&3)*8);
return (rt & ~mask) | val;
} else if (opcode == 0x28) { // sb
uint32 val = (rt&0xFF) << (24-(rs&3)*8);
uint32 mask = 0xFFFFFFFF ^ uint32(0xFF << (24-(rs&3)*8));
...
...
@@ -364,13 +364,16 @@ contract MIPS {
uint32 val = rt >> ((rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) >> ((rs&3)*8);
return (mem & ~mask) | val;
} else if (opcode == 0x2b
|| opcode == 0x38) { // sw (or sc, not right?)
} else if (opcode == 0x2b
) { // sw
return rt;
} else if (opcode == 0x2e) { // swr
uint32 val = rt << (24-(rs&3)*8);
uint32 mask = uint32(0xFFFFFFFF) << (24-(rs&3)*8);
return (mem & ~mask) | val;
} else if (opcode == 0x30) { return mem; // ll
} else if (opcode == 0x38) { return rt; // sc
}
revert("invalid instruction");
}
}
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