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Commit 063e52ac authored by clabby's avatar clabby
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chore: Upgrade `MIPS.sol` solc version

parent 6020e6b7
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Showing with 720 additions and 713 deletions
op-bindings/bindings/mips.go
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......@@ -31,7 +31,7 @@ var (
// MIPSMetaData contains all meta data concerning the MIPS contract.
var MIPSMetaData = &bind.MetaData{
ABI: "[{\"inputs\":[],\"name\":\"BRK_START\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"oracle\",\"outputs\":[{\"internalType\":\"contractIPreimageOracle\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"stateData\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"proof\",\"type\":\"bytes\"}],\"name\":\"step\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]",
Bin: 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}
// MIPSABI is the input ABI used to generate the binding from.
......
op-bindings/bindings/mips_more.go
View file @ 063e52ac
......@@ -13,7 +13,7 @@ const MIPSStorageLayoutJSON = "{\"storage\":[{\"astId\":1000,\"contract\":\"src/
var MIPSStorageLayout = new(solc.StorageLayout)
var MIPSDeployedBin = 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......
packages/contracts-bedrock/src/cannon/MIPS.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma solidity 0.8.15;
import { IPreimageOracle } from "./interfaces/IPreimageOracle.sol";
import { PreimageKeyLib } from "./PreimageKeyLib.sol";
......@@ -20,7 +20,6 @@ import { PreimageKeyLib } from "./PreimageKeyLib.sol";
/// @dev https://github.com/golang/go/blob/master/src/syscall/zerrors_linux_mips.go
/// MIPS linux kernel errors used by Go runtime
contract MIPS {
/// @notice Stores the VM state.
/// Total state size: 32 + 32 + 6 * 4 + 1 + 1 + 8 + 32 * 4 = 226 bytes
/// If nextPC != pc + 4, then the VM is executing a branch/jump delay slot.
......@@ -58,10 +57,12 @@ contract MIPS {
/// @notice Extends the value leftwards with its most significant bit (sign extension).
function SE(uint32 _dat, uint32 _idx) internal pure returns (uint32) {
bool isSigned = (_dat >> (_idx - 1)) != 0;
uint256 signed = ((1 << (32 - _idx)) - 1) << _idx;
uint256 mask = (1 << _idx) - 1;
return uint32(_dat & mask | (isSigned ? signed : 0));
unchecked {
bool isSigned = (_dat >> (_idx - 1)) != 0;
uint256 signed = ((1 << (32 - _idx)) - 1) << _idx;
uint256 mask = (1 << _idx) - 1;
return uint32(_dat & mask | (isSigned ? signed : 0));
}
}
/// @notice Computes the hash of the MIPS state.
......@@ -110,165 +111,166 @@ contract MIPS {
// Compute the hash of the resulting MIPS state
out_ := keccak256(start, sub(to, start))
}
return out_;
}
/// @notice Handles a syscall.
function handleSyscall() internal returns (bytes32 out_) {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
// Load the syscall number from the registers
uint32 syscall_no = state.registers[2];
uint32 v0 = 0;
uint32 v1 = 0;
// Load the syscall arguments from the registers
uint32 a0 = state.registers[4];
uint32 a1 = state.registers[5];
uint32 a2 = state.registers[6];
// mmap: Allocates a page from the heap.
if (syscall_no == 4090) {
uint32 sz = a1;
if (sz&4095 != 0) { // adjust size to align with page size
sz += 4096 - (sz&4095);
}
if (a0 == 0) {
v0 = state.heap;
state.heap += sz;
} else {
v0 = a0;
unchecked {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
// Load the syscall number from the registers
uint32 syscall_no = state.registers[2];
uint32 v0 = 0;
uint32 v1 = 0;
// Load the syscall arguments from the registers
uint32 a0 = state.registers[4];
uint32 a1 = state.registers[5];
uint32 a2 = state.registers[6];
// mmap: Allocates a page from the heap.
if (syscall_no == 4090) {
uint32 sz = a1;
if (sz&4095 != 0) { // adjust size to align with page size
sz += 4096 - (sz&4095);
}
if (a0 == 0) {
v0 = state.heap;
state.heap += sz;
} else {
v0 = a0;
}
}
}
// brk: Returns a fixed address for the program break at 0x40000000
else if (syscall_no == 4045) {
v0 = BRK_START;
}
// clone (not supported) returns 1
else if (syscall_no == 4120) {
v0 = 1;
}
// exit group: Sets the Exited and ExitCode states to true and argument 0.
else if (syscall_no == 4246) {
state.exited = true;
state.exitCode = uint8(a0);
return outputState();
}
// read: Like Linux read syscall. Splits unaligned reads into aligned reads.
else if (syscall_no == 4003) {
// args: a0 = fd, a1 = addr, a2 = count
// returns: v0 = read, v1 = err code
if (a0 == FD_STDIN) {
// Leave v0 and v1 zero: read nothing, no error
}
// pre-image oracle read
else if (a0 == FD_PREIMAGE_READ) {
// verify proof 1 is correct, and get the existing memory.
uint32 mem = readMem(a1 & 0xFFffFFfc, 1); // mask the addr to align it to 4 bytes
bytes32 preimageKey = state.preimageKey;
// If the preimage key is a local key, localize it in the context of the caller.
if (uint8(preimageKey[0]) == 1) {
preimageKey = PreimageKeyLib.localize(preimageKey);
}
(bytes32 dat, uint256 datLen) = oracle.readPreimage(preimageKey, state.preimageOffset);
// Transform data for writing to memory
// We use assembly for more precise ops, and no var count limit
assembly {
let alignment := and(a1, 3) // the read might not start at an aligned address
let space := sub(4, alignment) // remaining space in memory word
if lt(space, datLen) { datLen := space } // if less space than data, shorten data
if lt(a2, datLen) { datLen := a2 } // if requested to read less, read less
dat := shr(sub(256, mul(datLen, 8)), dat) // right-align data
dat := shl(mul(sub(sub(4, datLen), alignment), 8), dat) // position data to insert into memory word
let mask := sub(shl(mul(sub(4, alignment), 8), 1), 1) // mask all bytes after start
let suffixMask := sub(shl(mul(sub(sub(4, alignment), datLen), 8), 1), 1) // mask of all bytes starting from end, maybe none
mask := and(mask, not(suffixMask)) // reduce mask to just cover the data we insert
mem := or(and(mem, not(mask)), dat) // clear masked part of original memory, and insert data
}
// Write memory back
writeMem(a1 & 0xFFffFFfc, 1, mem);
state.preimageOffset += uint32(datLen);
v0 = uint32(datLen);
}
// hint response
else if (a0 == FD_HINT_READ) {
// Don't read into memory, just say we read it all
// The result is ignored anyway
v0 = a2;
}
else {
v0 = 0xFFffFFff;
v1 = EBADF;
// brk: Returns a fixed address for the program break at 0x40000000
else if (syscall_no == 4045) {
v0 = BRK_START;
}
// clone (not supported) returns 1
else if (syscall_no == 4120) {
v0 = 1;
}
// exit group: Sets the Exited and ExitCode states to true and argument 0.
else if (syscall_no == 4246) {
state.exited = true;
state.exitCode = uint8(a0);
return outputState();
}
// read: Like Linux read syscall. Splits unaligned reads into aligned reads.
else if (syscall_no == 4003) {
// args: a0 = fd, a1 = addr, a2 = count
// returns: v0 = read, v1 = err code
if (a0 == FD_STDIN) {
// Leave v0 and v1 zero: read nothing, no error
}
// pre-image oracle read
else if (a0 == FD_PREIMAGE_READ) {
// verify proof 1 is correct, and get the existing memory.
uint32 mem = readMem(a1 & 0xFFffFFfc, 1); // mask the addr to align it to 4 bytes
bytes32 preimageKey = state.preimageKey;
// If the preimage key is a local key, localize it in the context of the caller.
if (uint8(preimageKey[0]) == 1) {
preimageKey = PreimageKeyLib.localize(preimageKey);
}
(bytes32 dat, uint256 datLen) = oracle.readPreimage(preimageKey, state.preimageOffset);
// Transform data for writing to memory
// We use assembly for more precise ops, and no var count limit
assembly {
let alignment := and(a1, 3) // the read might not start at an aligned address
let space := sub(4, alignment) // remaining space in memory word
if lt(space, datLen) { datLen := space } // if less space than data, shorten data
if lt(a2, datLen) { datLen := a2 } // if requested to read less, read less
dat := shr(sub(256, mul(datLen, 8)), dat) // right-align data
dat := shl(mul(sub(sub(4, datLen), alignment), 8), dat) // position data to insert into memory word
let mask := sub(shl(mul(sub(4, alignment), 8), 1), 1) // mask all bytes after start
let suffixMask := sub(shl(mul(sub(sub(4, alignment), datLen), 8), 1), 1) // mask of all bytes starting from end, maybe none
mask := and(mask, not(suffixMask)) // reduce mask to just cover the data we insert
mem := or(and(mem, not(mask)), dat) // clear masked part of original memory, and insert data
}
// Write memory back
writeMem(a1 & 0xFFffFFfc, 1, mem);
state.preimageOffset += uint32(datLen);
v0 = uint32(datLen);
}
// hint response
else if (a0 == FD_HINT_READ) {
// Don't read into memory, just say we read it all
// The result is ignored anyway
v0 = a2;
}
else {
v0 = 0xFFffFFff;
v1 = EBADF;
}
}
}
// write: like Linux write syscall. Splits unaligned writes into aligned writes.
else if (syscall_no == 4004) {
// args: a0 = fd, a1 = addr, a2 = count
// returns: v0 = written, v1 = err code
if (a0 == FD_STDOUT || a0 == FD_STDERR || a0 == FD_HINT_WRITE) {
v0 = a2; // tell program we have written everything
}
// pre-image oracle
else if (a0 == FD_PREIMAGE_WRITE) {
uint32 mem = readMem(a1 & 0xFFffFFfc, 1); // mask the addr to align it to 4 bytes
bytes32 key = state.preimageKey;
// Construct pre-image key from memory
// We use assembly for more precise ops, and no var count limit
assembly {
let alignment := and(a1, 3) // the read might not start at an aligned address
let space := sub(4, alignment) // remaining space in memory word
if lt(space, a2) { a2 := space } // if less space than data, shorten data
key := shl(mul(a2, 8), key) // shift key, make space for new info
let mask := sub(shl(mul(a2, 8), 1), 1) // mask for extracting value from memory
mem := and(shr(mul(sub(space, a2), 8), mem), mask) // align value to right, mask it
key := or(key, mem) // insert into key
}
// Write pre-image key to oracle
state.preimageKey = key;
state.preimageOffset = 0; // reset offset, to read new pre-image data from the start
v0 = a2;
}
else {
v0 = 0xFFffFFff;
v1 = EBADF;
// write: like Linux write syscall. Splits unaligned writes into aligned writes.
else if (syscall_no == 4004) {
// args: a0 = fd, a1 = addr, a2 = count
// returns: v0 = written, v1 = err code
if (a0 == FD_STDOUT || a0 == FD_STDERR || a0 == FD_HINT_WRITE) {
v0 = a2; // tell program we have written everything
}
// pre-image oracle
else if (a0 == FD_PREIMAGE_WRITE) {
uint32 mem = readMem(a1 & 0xFFffFFfc, 1); // mask the addr to align it to 4 bytes
bytes32 key = state.preimageKey;
// Construct pre-image key from memory
// We use assembly for more precise ops, and no var count limit
assembly {
let alignment := and(a1, 3) // the read might not start at an aligned address
let space := sub(4, alignment) // remaining space in memory word
if lt(space, a2) { a2 := space } // if less space than data, shorten data
key := shl(mul(a2, 8), key) // shift key, make space for new info
let mask := sub(shl(mul(a2, 8), 1), 1) // mask for extracting value from memory
mem := and(shr(mul(sub(space, a2), 8), mem), mask) // align value to right, mask it
key := or(key, mem) // insert into key
}
// Write pre-image key to oracle
state.preimageKey = key;
state.preimageOffset = 0; // reset offset, to read new pre-image data from the start
v0 = a2;
}
else {
v0 = 0xFFffFFff;
v1 = EBADF;
}
}
}
// fcntl: Like linux fcntl syscall, but only supports minimal file-descriptor control commands,
// to retrieve the file-descriptor R/W flags.
else if (syscall_no == 4055) { // fcntl
// args: a0 = fd, a1 = cmd
if (a1 == 3) { // F_GETFL: get file descriptor flags
if (a0 == FD_STDIN || a0 == FD_PREIMAGE_READ || a0 == FD_HINT_READ) {
v0 = 0; // O_RDONLY
} else if (a0 == FD_STDOUT || a0 == FD_STDERR || a0 == FD_PREIMAGE_WRITE || a0 == FD_HINT_WRITE) {
v0 = 1; // O_WRONLY
// fcntl: Like linux fcntl syscall, but only supports minimal file-descriptor control commands,
// to retrieve the file-descriptor R/W flags.
else if (syscall_no == 4055) { // fcntl
// args: a0 = fd, a1 = cmd
if (a1 == 3) { // F_GETFL: get file descriptor flags
if (a0 == FD_STDIN || a0 == FD_PREIMAGE_READ || a0 == FD_HINT_READ) {
v0 = 0; // O_RDONLY
} else if (a0 == FD_STDOUT || a0 == FD_STDERR || a0 == FD_PREIMAGE_WRITE || a0 == FD_HINT_WRITE) {
v0 = 1; // O_WRONLY
} else {
v0 = 0xFFffFFff;
v1 = EBADF;
}
} else {
v0 = 0xFFffFFff;
v1 = EBADF;
v1 = EINVAL; // cmd not recognized by this kernel
}
} else {
v0 = 0xFFffFFff;
v1 = EINVAL; // cmd not recognized by this kernel
}
}
// Write the results back to the state registers
state.registers[2] = v0;
state.registers[7] = v1;
// Write the results back to the state registers
state.registers[2] = v0;
state.registers[7] = v1;
// Update the PC and nextPC
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
// Update the PC and nextPC
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
out_ = outputState();
out_ = outputState();
}
}
/// @notice Handles a branch instruction, updating the MIPS state PC where needed.
......@@ -278,55 +280,57 @@ contract MIPS {
/// @param _rs The register to be compared with the branch register.
/// @return out_ The hashed MIPS state.
function handleBranch(uint32 _opcode, uint32 _insn, uint32 _rtReg, uint32 _rs) internal returns (bytes32 out_) {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
bool shouldBranch = false;
// beq/bne: Branch on equal / not equal
if (_opcode == 4 || _opcode == 5) {
uint32 rt = state.registers[_rtReg];
shouldBranch = (_rs == rt && _opcode == 4) || (_rs != rt && _opcode == 5);
}
// blez: Branches if instruction is less than or equal to zero
else if (_opcode == 6) {
shouldBranch = int32(_rs) <= 0;
}
// bgtz: Branches if instruction is greater than zero
else if (_opcode == 7) {
shouldBranch = int32(_rs) > 0;
}
// bltz/bgez: Branch on less than zero / greater than or equal to zero
else if (_opcode == 1) {
// regimm
uint32 rtv = ((_insn >> 16) & 0x1F);
if (rtv == 0) {
shouldBranch = int32(_rs) < 0;
}
if (rtv == 1) {
shouldBranch = int32(_rs) >= 0;
unchecked {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
bool shouldBranch = false;
// beq/bne: Branch on equal / not equal
if (_opcode == 4 || _opcode == 5) {
uint32 rt = state.registers[_rtReg];
shouldBranch = (_rs == rt && _opcode == 4) || (_rs != rt && _opcode == 5);
}
// blez: Branches if instruction is less than or equal to zero
else if (_opcode == 6) {
shouldBranch = int32(_rs) <= 0;
}
// bgtz: Branches if instruction is greater than zero
else if (_opcode == 7) {
shouldBranch = int32(_rs) > 0;
}
// bltz/bgez: Branch on less than zero / greater than or equal to zero
else if (_opcode == 1) {
// regimm
uint32 rtv = ((_insn >> 16) & 0x1F);
if (rtv == 0) {
shouldBranch = int32(_rs) < 0;
}
if (rtv == 1) {
shouldBranch = int32(_rs) >= 0;
}
}
}
// Update the state's previous PC
uint32 prevPC = state.pc;
// Update the state's previous PC
uint32 prevPC = state.pc;
// Execute the delay slot first
state.pc = state.nextPC;
// Execute the delay slot first
state.pc = state.nextPC;
// If we should branch, update the PC to the branch target
// Otherwise, proceed to the next instruction
if (shouldBranch) {
state.nextPC = prevPC + 4 + (SE(_insn & 0xFFFF, 16) << 2);
} else {
state.nextPC = state.nextPC + 4;
}
// If we should branch, update the PC to the branch target
// Otherwise, proceed to the next instruction
if (shouldBranch) {
state.nextPC = prevPC + 4 + (SE(_insn & 0xFFFF, 16) << 2);
} else {
state.nextPC = state.nextPC + 4;
}
// Return the hash of the resulting state
out_ = outputState();
// Return the hash of the resulting state
out_ = outputState();
}
}
/// @notice Handles HI and LO register instructions.
......@@ -336,68 +340,70 @@ contract MIPS {
/// @param _storeReg The register to store the result in.
/// @return out_ The hash of the resulting MIPS state.
function handleHiLo(uint32 _func, uint32 _rs, uint32 _rt, uint32 _storeReg) internal returns (bytes32 out_) {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
unchecked {
// Load state from memory
State memory state;
assembly {
state := 0x80
}
uint32 val;
uint32 val;
// mfhi: Move the contents of the HI register into the destination
if (_func == 0x10) {
val = state.hi;
}
// mthi: Move the contents of the source into the HI register
else if (_func == 0x11) {
state.hi = _rs;
}
// mflo: Move the contents of the LO register into the destination
else if (_func == 0x12) {
val = state.lo;
}
// mtlo: Move the contents of the source into the LO register
else if (_func == 0x13) {
state.lo = _rs;
}
// mult: Multiplies `rs` by `rt` and stores the result in HI and LO registers
else if (_func == 0x18) {
uint64 acc = uint64(int64(int32(_rs)) * int64(int32(_rt)));
state.hi = uint32(acc >> 32);
state.lo = uint32(acc);
}
// multu: Unsigned multiplies `rs` by `rt` and stores the result in HI and LO registers
else if (_func == 0x19) {
uint64 acc = uint64(uint64(_rs) * uint64(_rt));
state.hi = uint32(acc >> 32);
state.lo = uint32(acc);
}
// div: Divides `rs` by `rt`.
// Stores the quotient in LO
// And the remainder in HI
else if (_func == 0x1a) {
state.hi = uint32(int32(_rs) % int32(_rt));
state.lo = uint32(int32(_rs) / int32(_rt));
}
// divu: Unsigned divides `rs` by `rt`.
// Stores the quotient in LO
// And the remainder in HI
else if (_func == 0x1b) {
state.hi = _rs % _rt;
state.lo = _rs / _rt;
}
// mfhi: Move the contents of the HI register into the destination
if (_func == 0x10) {
val = state.hi;
}
// mthi: Move the contents of the source into the HI register
else if (_func == 0x11) {
state.hi = _rs;
}
// mflo: Move the contents of the LO register into the destination
else if (_func == 0x12) {
val = state.lo;
}
// mtlo: Move the contents of the source into the LO register
else if (_func == 0x13) {
state.lo = _rs;
}
// mult: Multiplies `rs` by `rt` and stores the result in HI and LO registers
else if (_func == 0x18) {
uint64 acc = uint64(int64(int32(_rs)) * int64(int32(_rt)));
state.hi = uint32(acc >> 32);
state.lo = uint32(acc);
}
// multu: Unsigned multiplies `rs` by `rt` and stores the result in HI and LO registers
else if (_func == 0x19) {
uint64 acc = uint64(uint64(_rs) * uint64(_rt));
state.hi = uint32(acc >> 32);
state.lo = uint32(acc);
}
// div: Divides `rs` by `rt`.
// Stores the quotient in LO
// And the remainder in HI
else if (_func == 0x1a) {
state.hi = uint32(int32(_rs) % int32(_rt));
state.lo = uint32(int32(_rs) / int32(_rt));
}
// divu: Unsigned divides `rs` by `rt`.
// Stores the quotient in LO
// And the remainder in HI
else if (_func == 0x1b) {
state.hi = _rs % _rt;
state.lo = _rs / _rt;
}
// Store the result in the destination register, if applicable
if (_storeReg != 0) {
state.registers[_storeReg] = val;
}
// Store the result in the destination register, if applicable
if (_storeReg != 0) {
state.registers[_storeReg] = val;
}
// Update the PC
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
// Update the PC
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
// Return the hash of the resulting state
out_ = outputState();
// Return the hash of the resulting state
out_ = outputState();
}
}
/// @notice Handles a jump instruction, updating the MIPS state PC where needed.
......@@ -405,24 +411,26 @@ contract MIPS {
/// @param _dest The destination to jump to.
/// @return out_ The hashed MIPS state.
function handleJump(uint32 _linkReg, uint32 _dest) internal returns (bytes32 out_) {
// Load state from memory.
State memory state;
assembly {
state := 0x80
}
unchecked {
// Load state from memory.
State memory state;
assembly {
state := 0x80
}
// Update the next PC to the jump destination.
uint32 prevPC = state.pc;
state.pc = state.nextPC;
state.nextPC = _dest;
// Update the next PC to the jump destination.
uint32 prevPC = state.pc;
state.pc = state.nextPC;
state.nextPC = _dest;
// Update the link-register to the instruction after the delay slot instruction.
if (_linkReg != 0) {
state.registers[_linkReg] = prevPC + 8;
}
// Update the link-register to the instruction after the delay slot instruction.
if (_linkReg != 0) {
state.registers[_linkReg] = prevPC + 8;
}
// Return the hash of the resulting state.
out_ = outputState();
// Return the hash of the resulting state.
out_ = outputState();
}
}
/// @notice Handles a storing a value into a register.
......@@ -431,39 +439,43 @@ contract MIPS {
/// @param _conditional Whether or not the store is conditional.
/// @return out_ The hashed MIPS state.
function handleRd(uint32 _storeReg, uint32 _val, bool _conditional) internal returns (bytes32 out_) {
// Load state from memory.
State memory state;
assembly {
state := 0x80
}
unchecked {
// Load state from memory.
State memory state;
assembly {
state := 0x80
}
// The destination register must be valid.
require(_storeReg < 32, "valid register");
// The destination register must be valid.
require(_storeReg < 32, "valid register");
// Never write to reg 0, and it can be conditional (movz, movn).
if (_storeReg != 0 && _conditional) {
state.registers[_storeReg] = _val;
}
// Never write to reg 0, and it can be conditional (movz, movn).
if (_storeReg != 0 && _conditional) {
state.registers[_storeReg] = _val;
}
// Update the PC.
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
// Update the PC.
state.pc = state.nextPC;
state.nextPC = state.nextPC + 4;
// Return the hash of the resulting state.
out_ = outputState();
// Return the hash of the resulting state.
out_ = outputState();
}
}
/// @notice Computes the offset of the proof in the calldata.
/// @param _proofIndex The index of the proof in the calldata.
/// @return offset_ The offset of the proof in the calldata.
function proofOffset(uint8 _proofIndex) internal pure returns (uint256 offset_) {
// A proof of 32 bit memory, with 32-byte leaf values, is (32-5)=27 bytes32 entries.
// And the leaf value itself needs to be encoded as well. And proof.offset == 358
offset_ = 358 + (uint256(_proofIndex) * (28 * 32));
uint256 s = 0;
assembly { s := calldatasize() }
require(s >= (offset_ + 28 * 32), "check that there is enough calldata");
return offset_;
unchecked {
// A proof of 32 bit memory, with 32-byte leaf values, is (32-5)=27 bytes32 entries.
// And the leaf value itself needs to be encoded as well. And proof.offset == 358
offset_ = 358 + (uint256(_proofIndex) * (28 * 32));
uint256 s = 0;
assembly { s := calldatasize() }
require(s >= (offset_ + 28 * 32), "check that there is enough calldata");
return offset_;
}
}
/// @notice Reads a 32-bit value from memory.
......@@ -471,53 +483,55 @@ contract MIPS {
/// @param _proofIndex The index of the proof in the calldata.
/// @return out_ The hashed MIPS state.
function readMem(uint32 _addr, uint8 _proofIndex) internal pure returns (uint32 out_) {
// Compute the offset of the proof in the calldata.
uint256 offset = proofOffset(_proofIndex);
assembly {
// Validate the address alignement.
if and(_addr, 3) {
revert(0, 0)
}
unchecked {
// Compute the offset of the proof in the calldata.
uint256 offset = proofOffset(_proofIndex);
assembly {
// Validate the address alignement.
if and(_addr, 3) {
revert(0, 0)
}
// Load the leaf value.
let leaf := calldataload(offset)
offset := add(offset, 32)
// Load the leaf value.
let leaf := calldataload(offset)
offset := add(offset, 32)
// Convenience function to hash two nodes together in scratch space.
function hashPair(a, b) -> h {
mstore(0, a)
mstore(32, b)
h := keccak256(0, 64)
}
// Convenience function to hash two nodes together in scratch space.
function hashPair(a, b) -> h {
mstore(0, a)
mstore(32, b)
h := keccak256(0, 64)
}
// Start with the leaf node.
// Work back up by combining with siblings, to reconstruct the root.
let path := shr(5, _addr)
let node := leaf
for { let i := 0 } lt(i, 27) { i := add(i, 1) } {
let sibling := calldataload(offset)
offset := add(offset, 32)
switch and(shr(i, path), 1)
case 0 {
node := hashPair(node, sibling)
} case 1 {
node := hashPair(sibling, node)
// Start with the leaf node.
// Work back up by combining with siblings, to reconstruct the root.
let path := shr(5, _addr)
let node := leaf
for { let i := 0 } lt(i, 27) { i := add(i, 1) } {
let sibling := calldataload(offset)
offset := add(offset, 32)
switch and(shr(i, path), 1)
case 0 {
node := hashPair(node, sibling)
} case 1 {
node := hashPair(sibling, node)
}
}
}
// Load the memory root from the first field of state.
let memRoot := mload(0x80)
// Load the memory root from the first field of state.
let memRoot := mload(0x80)
// Verify the root matches.
if iszero(eq(node, memRoot)) {
mstore(0, 0x0badf00d)
revert(0, 32)
}
// Verify the root matches.
if iszero(eq(node, memRoot)) {
mstore(0, 0x0badf00d)
revert(0, 32)
}
// Bits to shift = (32 - 4 - (addr % 32)) * 8
let shamt := shl(3, sub(sub(32, 4), and(_addr, 31)))
out_ := and(shr(shamt, leaf), 0xFFffFFff)
// Bits to shift = (32 - 4 - (addr % 32)) * 8
let shamt := shl(3, sub(sub(32, 4), and(_addr, 31)))
out_ := and(shr(shamt, leaf), 0xFFffFFff)
}
}
}
......@@ -528,397 +542,403 @@ contract MIPS {
/// @param _proofIndex The index of the proof in the calldata.
/// @param _val The value to write.
function writeMem(uint32 _addr, uint8 _proofIndex, uint32 _val) internal pure {
// Compute the offset of the proof in the calldata.
uint256 offset = proofOffset(_proofIndex);
assembly {
// Validate the address alignement.
if and(_addr, 3) {
revert(0, 0)
}
unchecked {
// Compute the offset of the proof in the calldata.
uint256 offset = proofOffset(_proofIndex);
assembly {
// Validate the address alignement.
if and(_addr, 3) {
revert(0, 0)
}
// Load the leaf value.
let leaf := calldataload(offset)
let shamt := shl(3, sub(sub(32, 4), and(_addr, 31)))
// Load the leaf value.
let leaf := calldataload(offset)
let shamt := shl(3, sub(sub(32, 4), and(_addr, 31)))
// Mask out 4 bytes, and OR in the value
leaf := or(and(leaf, not(shl(shamt, 0xFFffFFff))), shl(shamt, _val))
offset := add(offset, 32)
// Mask out 4 bytes, and OR in the value
leaf := or(and(leaf, not(shl(shamt, 0xFFffFFff))), shl(shamt, _val))
offset := add(offset, 32)
// Convenience function to hash two nodes together in scratch space.
function hashPair(a, b) -> h {
mstore(0, a)
mstore(32, b)
h := keccak256(0, 64)
}
// Convenience function to hash two nodes together in scratch space.
function hashPair(a, b) -> h {
mstore(0, a)
mstore(32, b)
h := keccak256(0, 64)
}
// Start with the leaf node.
// Work back up by combining with siblings, to reconstruct the root.
let path := shr(5, _addr)
let node := leaf
for { let i := 0 } lt(i, 27) { i := add(i, 1) } {
let sibling := calldataload(offset)
offset := add(offset, 32)
switch and(shr(i, path), 1)
case 0 {
node := hashPair(node, sibling)
} case 1 {
node := hashPair(sibling, node)
// Start with the leaf node.
// Work back up by combining with siblings, to reconstruct the root.
let path := shr(5, _addr)
let node := leaf
for { let i := 0 } lt(i, 27) { i := add(i, 1) } {
let sibling := calldataload(offset)
offset := add(offset, 32)
switch and(shr(i, path), 1)
case 0 {
node := hashPair(node, sibling)
} case 1 {
node := hashPair(sibling, node)
}
}
}
// Store the new memory root in the first field of state.
mstore(0x80, node)
// Store the new memory root in the first field of state.
mstore(0x80, node)
}
}
}
/// @notice Executes a single step of the vm.
/// Will revert if any required input state is missing.
function step(bytes calldata stateData, bytes calldata proof) public returns (bytes32) {
State memory state;
unchecked {
State memory state;
// Packed calldata is ~6 times smaller than state size
assembly {
if iszero(eq(state, 0x80)) { // expected state mem offset check
revert(0,0)
}
if iszero(eq(mload(0x40), mul(32, 48))) { // expected memory check
revert(0,0)
}
if iszero(eq(stateData.offset, 100)) { // 32*3+4=100 expected state data offset
revert(0,0)
}
if iszero(eq(proof.offset, 358)) { // 100+32+226=358 expected proof offset
revert(0,0)
}
function putField(callOffset, memOffset, size) -> callOffsetOut, memOffsetOut {
// calldata is packed, thus starting left-aligned, shift-right to pad and right-align
let w := shr(shl(3, sub(32, size)), calldataload(callOffset))
mstore(memOffset, w)
callOffsetOut := add(callOffset, size)
memOffsetOut := add(memOffset, 32)
}
// Unpack state from calldata into memory
let c := stateData.offset // calldata offset
let m := 0x80 // mem offset
c, m := putField(c, m, 32) // memRoot
c, m := putField(c, m, 32) // preimageKey
c, m := putField(c, m, 4) // preimageOffset
c, m := putField(c, m, 4) // pc
c, m := putField(c, m, 4) // nextPC
c, m := putField(c, m, 4) // lo
c, m := putField(c, m, 4) // hi
c, m := putField(c, m, 4) // heap
c, m := putField(c, m, 1) // exitCode
c, m := putField(c, m, 1) // exited
c, m := putField(c, m, 8) // step
// Unpack register calldata into memory
mstore(m, add(m, 32)) // offset to registers
m := add(m, 32)
for { let i := 0 } lt(i, 32) { i := add(i, 1) } {
c, m := putField(c, m, 4)
}
}
// Packed calldata is ~6 times smaller than state size
assembly {
if iszero(eq(state, 0x80)) { // expected state mem offset check
revert(0,0)
}
if iszero(eq(mload(0x40), mul(32, 48))) { // expected memory check
revert(0,0)
}
if iszero(eq(stateData.offset, 100)) { // 32*3+4=100 expected state data offset
revert(0,0)
}
if iszero(eq(proof.offset, 358)) { // 100+32+226=358 expected proof offset
revert(0,0)
}
// Don't change state once exited
if (state.exited) {
return outputState();
}
function putField(callOffset, memOffset, size) -> callOffsetOut, memOffsetOut {
// calldata is packed, thus starting left-aligned, shift-right to pad and right-align
let w := shr(shl(3, sub(32, size)), calldataload(callOffset))
mstore(memOffset, w)
callOffsetOut := add(callOffset, size)
memOffsetOut := add(memOffset, 32)
}
state.step += 1;
// Unpack state from calldata into memory
let c := stateData.offset // calldata offset
let m := 0x80 // mem offset
c, m := putField(c, m, 32) // memRoot
c, m := putField(c, m, 32) // preimageKey
c, m := putField(c, m, 4) // preimageOffset
c, m := putField(c, m, 4) // pc
c, m := putField(c, m, 4) // nextPC
c, m := putField(c, m, 4) // lo
c, m := putField(c, m, 4) // hi
c, m := putField(c, m, 4) // heap
c, m := putField(c, m, 1) // exitCode
c, m := putField(c, m, 1) // exited
c, m := putField(c, m, 8) // step
// Unpack register calldata into memory
mstore(m, add(m, 32)) // offset to registers
m := add(m, 32)
for { let i := 0 } lt(i, 32) { i := add(i, 1) } {
c, m := putField(c, m, 4)
}
}
// instruction fetch
uint32 insn = readMem(state.pc, 0);
uint32 opcode = insn >> 26; // 6-bits
// Don't change state once exited
if (state.exited) {
return outputState();
}
// j-type j/jal
if (opcode == 2 || opcode == 3) {
// TODO(CLI-4136): likely bug in original code: MIPS spec says this should be in the "current" region;
// a 256 MB aligned region (i.e. use top 4 bits of branch delay slot (pc+4))
return handleJump(opcode == 2 ? 0 : 31, SE(insn & 0x03FFFFFF, 26) << 2);
}
state.step += 1;
// register fetch
uint32 rs; // source register 1 value
uint32 rt; // source register 2 / temp value
uint32 rtReg = (insn >> 16) & 0x1F;
// R-type or I-type (stores rt)
rs = state.registers[(insn >> 21) & 0x1F];
uint32 rdReg = rtReg;
if (opcode == 0 || opcode == 0x1c) {
// R-type (stores rd)
rt = state.registers[rtReg];
rdReg = (insn >> 11) & 0x1F;
} else if (opcode < 0x20) {
// rt is SignExtImm
// don't sign extend for andi, ori, xori
if (opcode == 0xC || opcode == 0xD || opcode == 0xe) {
// ZeroExtImm
rt = insn & 0xFFFF;
} else {
// SignExtImm
rt = SE(insn & 0xFFFF, 16);
// instruction fetch
uint32 insn = readMem(state.pc, 0);
uint32 opcode = insn >> 26; // 6-bits
// j-type j/jal
if (opcode == 2 || opcode == 3) {
// TODO(CLI-4136): likely bug in original code: MIPS spec says this should be in the "current" region;
// a 256 MB aligned region (i.e. use top 4 bits of branch delay slot (pc+4))
return handleJump(opcode == 2 ? 0 : 31, SE(insn & 0x03FFFFFF, 26) << 2);
}
} else if (opcode >= 0x28 || opcode == 0x22 || opcode == 0x26) {
// store rt value with store
rt = state.registers[rtReg];
// store actual rt with lwl and lwr
rdReg = rtReg;
}
// register fetch
uint32 rs; // source register 1 value
uint32 rt; // source register 2 / temp value
uint32 rtReg = (insn >> 16) & 0x1F;
if ((opcode >= 4 && opcode < 8) || opcode == 1) {
return handleBranch(opcode, insn, rtReg, rs);
}
// R-type or I-type (stores rt)
rs = state.registers[(insn >> 21) & 0x1F];
uint32 rdReg = rtReg;
uint32 storeAddr = 0xFF_FF_FF_FF;
// memory fetch (all I-type)
// we do the load for stores also
uint32 mem;
if (opcode >= 0x20) {
// M[R[rs]+SignExtImm]
rs += SE(insn&0xFFFF, 16);
uint32 addr = rs & 0xFFFFFFFC;
mem = readMem(addr, 1);
if (opcode >= 0x28 && opcode != 0x30) {
// store
storeAddr = addr;
// store opcodes don't write back to a register
rdReg = 0;
if (opcode == 0 || opcode == 0x1c) {
// R-type (stores rd)
rt = state.registers[rtReg];
rdReg = (insn >> 11) & 0x1F;
} else if (opcode < 0x20) {
// rt is SignExtImm
// don't sign extend for andi, ori, xori
if (opcode == 0xC || opcode == 0xD || opcode == 0xe) {
// ZeroExtImm
rt = insn & 0xFFFF;
} else {
// SignExtImm
rt = SE(insn & 0xFFFF, 16);
}
} else if (opcode >= 0x28 || opcode == 0x22 || opcode == 0x26) {
// store rt value with store
rt = state.registers[rtReg];
// store actual rt with lwl and lwr
rdReg = rtReg;
}
if ((opcode >= 4 && opcode < 8) || opcode == 1) {
return handleBranch(opcode, insn, rtReg, rs);
}
uint32 storeAddr = 0xFF_FF_FF_FF;
// memory fetch (all I-type)
// we do the load for stores also
uint32 mem;
if (opcode >= 0x20) {
// M[R[rs]+SignExtImm]
rs += SE(insn&0xFFFF, 16);
uint32 addr = rs & 0xFFFFFFFC;
mem = readMem(addr, 1);
if (opcode >= 0x28 && opcode != 0x30) {
// store
storeAddr = addr;
// store opcodes don't write back to a register
rdReg = 0;
}
}
}
// ALU
uint32 val = execute(insn, rs, rt, mem) & 0xffFFffFF; // swr outputs more than 4 bytes without the mask
// ALU
uint32 val = execute(insn, rs, rt, mem) & 0xffFFffFF; // swr outputs more than 4 bytes without the mask
uint32 func = insn & 0x3f; // 6-bits
if (opcode == 0 && func >= 8 && func < 0x1c) {
if (func == 8 || func == 9) { // jr/jalr
return handleJump(func == 8 ? 0 : rdReg, rs);
}
uint32 func = insn & 0x3f; // 6-bits
if (opcode == 0 && func >= 8 && func < 0x1c) {
if (func == 8 || func == 9) { // jr/jalr
return handleJump(func == 8 ? 0 : rdReg, rs);
}
if (func == 0xa) { // movz
return handleRd(rdReg, rs, rt == 0);
}
if (func == 0xb) { // movn
return handleRd(rdReg, rs, rt != 0);
}
if (func == 0xa) { // movz
return handleRd(rdReg, rs, rt == 0);
}
if (func == 0xb) { // movn
return handleRd(rdReg, rs, rt != 0);
}
// syscall (can read and write)
if (func == 0xC) {
return handleSyscall();
}
// syscall (can read and write)
if (func == 0xC) {
return handleSyscall();
// lo and hi registers
// can write back
if (func >= 0x10 && func < 0x1c) {
return handleHiLo(func, rs, rt, rdReg);
}
}
// lo and hi registers
// can write back
if (func >= 0x10 && func < 0x1c) {
return handleHiLo(func, rs, rt, rdReg);
// stupid sc, write a 1 to rt
if (opcode == 0x38 && rtReg != 0) {
state.registers[rtReg] = 1;
}
}
// stupid sc, write a 1 to rt
if (opcode == 0x38 && rtReg != 0) {
state.registers[rtReg] = 1;
}
// write memory
if (storeAddr != 0xFF_FF_FF_FF) {
writeMem(storeAddr, 1, val);
}
// write memory
if (storeAddr != 0xFF_FF_FF_FF) {
writeMem(storeAddr, 1, val);
// write back the value to destination register
return handleRd(rdReg, val, true);
}
// write back the value to destination register
return handleRd(rdReg, val, true);
}
/// @notice Execute an instruction.
function execute(uint32 insn, uint32 rs, uint32 rt, uint32 mem) internal pure returns (uint32) {
uint32 opcode = insn >> 26; // 6-bits
uint32 func = insn & 0x3f; // 6-bits
// TODO(CLI-4136): deref the immed into a register
if (opcode < 0x20) {
// transform ArithLogI
// TODO(CLI-4136): 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) {
// jr/jalr/div + others
if (func >= 0x08) {
return rs;
unchecked {
uint32 opcode = insn >> 26; // 6-bits
uint32 func = insn & 0x3f; // 6-bits
// TODO(CLI-4136): deref the immed into a register
if (opcode < 0x20) {
// transform ArithLogI
// TODO(CLI-4136): 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) {
// jr/jalr/div + others
if (func >= 0x08) {
return rs;
}
// sll: Logical Shift Left
else if (func == 0x00) {
return rt << shamt;
}
// srl: Logical Shift Right
else if (func == 0x02) {
return rt >> shamt;
}
// sra: Arithmetic Shift Right
else if (func == 0x03) {
return SE(rt >> shamt, 32 - shamt);
}
// sllv: Variable Logical Shift Left
else if (func == 0x04) {
return rt << (rs & 0x1F);
}
// srlv: Variable Logical Shift Right
else if (func == 0x06) {
return rt >> (rs & 0x1F);
}
// srav: Variable Arithmetic Shift Right
else if (func == 0x07) {
return SE(rt >> rs, 32 - rs);
}
}
// sll: Logical Shift Left
else if (func == 0x00) {
return rt << shamt;
// R-type (ArithLog)
// 0x10-0x13 = mfhi, mthi, mflo, mtlo
// add or addu
if (func == 0x20 || func == 0x21) {
return rs + rt;
}
// srl: Logical Shift Right
else if (func == 0x02) {
return rt >> shamt;
// sub or subu
else if (func == 0x22 || func == 0x23) {
return rs - rt;
}
// sra: Arithmetic Shift Right
else if (func == 0x03) {
return SE(rt >> shamt, 32 - shamt);
// and
else if (func == 0x24) {
return rs & rt;
}
// sllv: Variable Logical Shift Left
else if (func == 0x04) {
return rt << (rs & 0x1F);
// or
else if (func == 0x25) {
return (rs | rt);
}
// srlv: Variable Logical Shift Right
else if (func == 0x06) {
return rt >> (rs & 0x1F);
// xor
else if (func == 0x26) {
return (rs ^ rt);
}
// srav: Variable Arithmetic Shift Right
else if (func == 0x07) {
return SE(rt >> rs, 32 - rs);
// nor
else if (func == 0x27) {
return ~(rs | rt);
}
// slt: Set to 1 if less than
else if (func == 0x2a) {
return int32(rs) < int32(rt) ? 1 : 0;
}
// sltu: Set to 1 if less than unsigned
else if (func == 0x2B) {
return rs<rt ? 1 : 0;
}
}
// R-type (ArithLog)
// 0x10-0x13 = mfhi, mthi, mflo, mtlo
// add or addu
if (func == 0x20 || func == 0x21) {
return rs + rt;
}
// sub or subu
else if (func == 0x22 || func == 0x23) {
return rs - rt;
// lui: Load Upper Immediate
else if (opcode == 0xf) {
return rt << 16;
}
// and
else if (func == 0x24) {
return rs & rt;
// SPECIAL2
else if (opcode == 0x1c) {
// mul
if (func == 2) {
return uint32(int32(rs) * int32(rt));
}
// clo
if (func == 0x20 || func == 0x21) {
if (func == 0x20) {
rs = ~rs;
}
uint32 i = 0;
while (rs&0x80000000 != 0) {
i++;
rs <<= 1;
}
return i;
}
}
// or
else if (func == 0x25) {
return (rs | rt);
}
else if (opcode < 0x28) {
// lb
if (opcode == 0x20) {
return SE((mem >> (24 - (rs & 3) * 8)) & 0xFF, 8);
}
// xor
else if (func == 0x26) {
return (rs ^ rt);
// lh
else if (opcode == 0x21) {
return SE((mem >> (16 - (rs & 2) * 8)) & 0xFFFF, 16);
}
// nor
else if (func == 0x27) {
return ~(rs | rt);
// lwl
else if (opcode == 0x22) {
uint32 val = mem << ((rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) << ((rs & 3) * 8);
return (rt & ~mask) | val;
}
// slt: Set to 1 if less than
else if (func == 0x2a) {
return int32(rs) < int32(rt) ? 1 : 0;
// lw
else if (opcode == 0x23) {
return mem;
}
// sltu: Set to 1 if less than unsigned
else if (func == 0x2B) {
return rs<rt ? 1 : 0;
// lbu
else if (opcode == 0x24) {
return (mem >> (24 - (rs & 3) * 8)) & 0xFF;
}
}
// lui: Load Upper Immediate
else if (opcode == 0xf) {
return rt << 16;
}
// SPECIAL2
else if (opcode == 0x1c) {
// mul
if (func == 2) {
return uint32(int32(rs) * int32(rt));
// lhu
else if (opcode == 0x25) {
return (mem >> (16 - (rs & 2) * 8)) & 0xFFFF;
}
// clo
if (func == 0x20 || func == 0x21) {
if (func == 0x20) {
rs = ~rs;
}
uint32 i = 0;
while (rs&0x80000000 != 0) {
i++;
rs <<= 1;
}
return i;
// lwr
else if (opcode == 0x26) {
uint32 val = mem >> (24 - (rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) >> (24 - (rs & 3) * 8);
return (rt & ~mask) | val;
}
}
}
else if (opcode < 0x28) {
// lb
if (opcode == 0x20) {
return SE((mem >> (24 - (rs & 3) * 8)) & 0xFF, 8);
}
// lh
else if (opcode == 0x21) {
return SE((mem >> (16 - (rs & 2) * 8)) & 0xFFFF, 16);
}
// lwl
else if (opcode == 0x22) {
uint32 val = mem << ((rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) << ((rs & 3) * 8);
return (rt & ~mask) | val;
}
// lw
else if (opcode == 0x23) {
// sb
else if (opcode == 0x28) {
uint32 val = (rt & 0xFF) << (24 - (rs & 3) * 8);
uint32 mask = 0xFFFFFFFF ^ uint32(0xFF << (24 - (rs & 3) * 8));
return (mem & mask) | val;
}
// sh
else if (opcode == 0x29) {
uint32 val = (rt & 0xFFFF) << (16 - (rs & 2) * 8);
uint32 mask = 0xFFFFFFFF ^ uint32(0xFFFF << (16 - (rs & 2) * 8));
return (mem & mask) | val;
}
// swl
else if (opcode == 0x2a) {
uint32 val = rt >> ((rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) >> ((rs & 3) * 8);
return (mem & ~mask) | val;
}
// sw
else if (opcode == 0x2b) {
return rt;
}
// swr
else if (opcode == 0x2e) {
uint32 val = rt << (24 - (rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) << (24 - (rs & 3) * 8);
return (mem & ~mask) | val;
}
// ll
else if (opcode == 0x30) {
return mem;
}
// lbu
else if (opcode == 0x24) {
return (mem >> (24 - (rs & 3) * 8)) & 0xFF;
}
// lhu
else if (opcode == 0x25) {
return (mem >> (16 - (rs & 2) * 8)) & 0xFFFF;
// sc
else if (opcode == 0x38) {
return rt;
}
// lwr
else if (opcode == 0x26) {
uint32 val = mem >> (24 - (rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) >> (24 - (rs & 3) * 8);
return (rt & ~mask) | val;
}
}
// sb
else if (opcode == 0x28) {
uint32 val = (rt & 0xFF) << (24 - (rs & 3) * 8);
uint32 mask = 0xFFFFFFFF ^ uint32(0xFF << (24 - (rs & 3) * 8));
return (mem & mask) | val;
}
// sh
else if (opcode == 0x29) {
uint32 val = (rt & 0xFFFF) << (16 - (rs & 2) * 8);
uint32 mask = 0xFFFFFFFF ^ uint32(0xFFFF << (16 - (rs & 2) * 8));
return (mem & mask) | val;
}
// swl
else if (opcode == 0x2a) {
uint32 val = rt >> ((rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) >> ((rs & 3) * 8);
return (mem & ~mask) | val;
}
// sw
else if (opcode == 0x2b) {
return rt;
}
// swr
else if (opcode == 0x2e) {
uint32 val = rt << (24 - (rs & 3) * 8);
uint32 mask = uint32(0xFFFFFFFF) << (24 - (rs & 3) * 8);
return (mem & ~mask) | val;
}
// ll
else if (opcode == 0x30) {
return mem;
}
// sc
else if (opcode == 0x38) {
return rt;
}
revert("invalid instruction");
revert("invalid instruction");
}
}
}
packages/contracts-bedrock/src/cannon/PreimageKeyLib.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
pragma solidity 0.8.15;
/// @title PreimageKeyLib
/// @notice Shared utilities for localizing local keys in the preimage oracle.
......
packages/contracts-bedrock/src/cannon/PreimageOracle.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma solidity 0.8.15;
import { IPreimageOracle } from "./interfaces/IPreimageOracle.sol";
import { PreimageKeyLib } from "./PreimageKeyLib.sol";
/// @title PreimageOracle
/// @notice A contract for storing permissioned pre-images.
contract PreimageOracle {
contract PreimageOracle is IPreimageOracle {
/// @notice Mapping of pre-image keys to pre-image lengths.
mapping(bytes32 => uint256) public preimageLengths;
/// @notice Mapping of pre-image keys to pre-image parts.
......@@ -13,11 +14,7 @@ contract PreimageOracle {
/// @notice Mapping of pre-image keys to pre-image part offsets.
mapping(bytes32 => mapping(uint256 => bool)) public preimagePartOk;
/// @notice Reads a pre-image from the oracle.
/// @param _key The key of the pre-image to read.
/// @param _offset The offset of the pre-image to read.
/// @return dat_ The pre-image data.
/// @return datLen_ The length of the pre-image data.
/// @inheritdoc IPreimageOracle
function readPreimage(bytes32 _key, uint256 _offset)
external
view
......@@ -53,24 +50,7 @@ contract PreimageOracle {
preimageLengths[key] = size;
}
/// @notice Loads a word of local data into the preimage oracle in two separate parts.
/// @param _ident The identifier of the local data.
/// @param _word The local data word.
/// @param _size The number of bytes in `_word` to load.
/// @dev The local data parts are loaded into the preimage oracle under the context
/// of the caller - no other account can write to the caller's context
/// specific data.
///
/// There are 5 local data identifiers:
/// ┌────────────┬────────────────────────┐
/// │ Identifier │ Data │
/// ├────────────┼────────────────────────┤
/// │ 1 │ L1 Head Hash (bytes32) │
/// │ 2 │ Output Root (bytes32) │
/// │ 3 │ Root Claim (bytes32) │
/// │ 4 │ L2 Block Number (u64) │
/// │ 5 │ Chain ID (u64) │
/// └────────────┴────────────────────────┘
/// @inheritdoc IPreimageOracle
function loadLocalData(
uint256 _ident,
bytes32 _word,
......@@ -106,10 +86,7 @@ contract PreimageOracle {
preimageLengths[key_] = _size;
}
/// @notice Prepares a pre-image to be read by keccak256 key, starting at
/// the given offset and up to 32 bytes (clipped at pre-image length, if out of data).
/// @param _partOffset The offset of the pre-image to read.
/// @param _preimage The preimage data.
/// @inheritdoc IPreimageOracle
function loadKeccak256PreimagePart(uint256 _partOffset, bytes calldata _preimage) external {
uint256 size;
bytes32 key;
......
packages/contracts-bedrock/src/cannon/interfaces/IPreimageOracle.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma solidity 0.8.15;
/// @title IPreimageOracle
/// @notice Interface for a preimage oracle.
......@@ -14,10 +14,29 @@ interface IPreimageOracle {
view
returns (bytes32 dat_, uint256 datLen_);
/// @notice Computes and returns the key for a pre-image.
/// @param _preimage The pre-image.
/// @return key_ The pre-image key.
function computePreimageKey(bytes calldata _preimage) external pure returns (bytes32 key_);
/// @notice Loads a word of local data into the preimage oracle in two separate parts.
/// @param _ident The identifier of the local data.
/// @param _word The local data word.
/// @param _size The number of bytes in `_word` to load.
/// @dev The local data parts are loaded into the preimage oracle under the context
/// of the caller - no other account can write to the caller's context
/// specific data.
///
/// There are 5 local data identifiers:
/// ┌────────────┬────────────────────────┐
/// │ Identifier │ Data │
/// ├────────────┼────────────────────────┤
/// │ 1 │ L1 Head Hash (bytes32) │
/// │ 2 │ Output Root (bytes32) │
/// │ 3 │ Root Claim (bytes32) │
/// │ 4 │ L2 Block Number (u64) │
/// │ 5 │ Chain ID (u64) │
/// └────────────┴────────────────────────┘
function loadLocalData(
uint256 _ident,
bytes32 _word,
uint8 _size
) external returns (bytes32 key_);
/// @notice Prepares a preimage to be read by keccak256 key, starting at
/// the given offset and up to 32 bytes (clipped at preimage length, if out of data).
......
packages/contracts-bedrock/src/dispute/interfaces/IBigStepper.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;
import { IPreimageOracle } from "../../cannon/interfaces/IPreimageOracle.sol";
/// @title IBigStepper
/// @notice An interface for a contract with a state transition function that
/// will accept a pre state and return a post state.
......@@ -35,14 +37,3 @@ interface IBigStepper {
/// @notice Returns the preimage oracle used by the stepper.
function oracle() external view returns (IPreimageOracle oracle_);
}
/// @notice Temporary interface for the `IPreimageOracle`. Remove once we've upgraded
/// the cannon contracts to a newer version of solc.
interface IPreimageOracle {
function loadLocalData(
uint256 _ident,
bytes32 _word,
uint256 _size,
uint256 _partOffset
) external returns (bytes32 key_);
}
packages/contracts-bedrock/src/periphery/AssetReceiver.sol
View file @ 063e52ac
......@@ -64,6 +64,7 @@ contract AssetReceiver is Transactor {
function withdrawETH(address payable _to, uint256 _amount) public onlyOwner {
// slither-disable-next-line reentrancy-unlimited-gas
(bool success, ) = _to.call{ value: _amount }("");
success; // Suppress warning; We ignore the low-level call result.
emit WithdrewETH(msg.sender, _to, _amount);
}
......
packages/contracts-bedrock/test/PreimageOracle.t.sol
View file @ 063e52ac
// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
pragma abicoder v2;
pragma solidity 0.8.15;
import { Test } from "forge-std/Test.sol";
......
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