wip, l1call/l1delegatecall

cmd/geth/config.go

@@ -162,6 +162,7 @@ func makeConfigNode(ctx *cli.Context) (*node.Node, gethConfig) {
 	if ctx.IsSet(utils.EthStatsURLFlag.Name) {
 		cfg.Ethstats.URL = ctx.String(utils.EthStatsURLFlag.Name)
 	}
+
 	applyMetricConfig(ctx, &cfg)
 
 	return stack, cfg
@@ -183,6 +184,9 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 	// CHANGE(TAIKO): register Taiko RPC APIs.
 	utils.RegisterTaikoAPIs(stack, &cfg.Eth, eth)
 
+	// CHANGE(TAIKO): register L1 node
+	registerL1Node(ctx, &cfg)
+
 	// Create gauge with geth system and build information
 	if eth != nil { // The 'eth' backend may be nil in light mode
 		var protos []string
@@ -378,3 +382,11 @@ func setAccountManagerBackends(conf *node.Config, am *accounts.Manager, keydir s
 
 	return nil
 }
+
+// CHANGE(TAIKO)
+func registerL1Node(ctx *cli.Context, cfg *gethConfig) {
+	if ctx.IsSet(utils.L1RPCUrlFlag.Name) {
+		v := ctx.String(utils.L1RPCUrlFlag.Name)
+		cfg.Eth.L1RPCUrl = v
+	}
+}

cmd/geth/main.go

@@ -194,6 +194,11 @@ var (
 		utils.MetricsInfluxDBBucketFlag,
 		utils.MetricsInfluxDBOrganizationFlag,
 	}
+
+	taikoFlags = []cli.Flag{
+		utils.TaikoFlag,
+		utils.L1RPCUrlFlag,
+	}
 )
 
 var app = flags.NewApp("the go-ethereum command line interface")
@@ -244,7 +249,7 @@ func init() {
 		metricsFlags,
 	)
 	// CHANGE(taiko): append Taiko flags into the original GETH flags
-	app.Flags = append(app.Flags, &utils.TaikoFlag)
+	app.Flags = append(app.Flags, taikoFlags...)
 
 	flags.AutoEnvVars(app.Flags, "GETH")
 

cmd/utils/flags.go

@@ -1792,9 +1792,13 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 	}
 	// Override any default configs for hard coded networks.
 	switch {
-	// CHANGE(taiko): when --taiko flag is set, use the Taiko genesis.
+	// CHANGE(taiko): when --taiko flag is set, use the Taiko genesis, and set L1
+	// rpc url.
 	case ctx.IsSet(TaikoFlag.Name):
 		cfg.Genesis = core.TaikoGenesisBlock(cfg.NetworkId)
+		if ctx.IsSet(L1RPCUrlFlag.Name) {
+			cfg.L1RPCUrl = ctx.String(L1RPCUrlFlag.Name)
+		}
 	case ctx.Bool(MainnetFlag.Name):
 		if !ctx.IsSet(NetworkIdFlag.Name) {
 			cfg.NetworkId = 1

cmd/utils/taiko_flags.go

@@ -12,10 +12,15 @@ import (
 )
 
 var (
-	TaikoFlag = cli.BoolFlag{
+	TaikoFlag = &cli.BoolFlag{
 		Name:  "taiko",
 		Usage: "Taiko network",
 	}
+	L1RPCUrlFlag = &cli.StringFlag{
+		Name:     "l1RpcUrl",
+		Usage:    "Rpc url of an L1 node (must be archive)",
+		Required: true,
+	}
 )
 
 // RegisterTaikoAPIs initializes and registers the Taiko RPC APIs.

core/vm/contracts.go

@@ -39,7 +39,17 @@ import (
 // contract.
 type PrecompiledContract interface {
 	RequiredGas(input []byte) uint64                     // RequiredPrice calculates the contract gas use
-	Run(input []byte) ([]byte, error) // Run runs the precompiled contract
+	Run(opt *TaikoRunOpts, input []byte) ([]byte, error) // Run runs the precompiled contract
+}
+
+// CHANGE(TAIKO): TaikoL1RunOpts is an opt added to the PrecompiledContract Run method
+// to allow the taiko-specific precompiles to have access to additional necessary
+// params.
+type TaikoRunOpts struct {
+	L1RPCUrl    string
+	StateDB     StateDB
+	Interpreter *EVMInterpreter
+	Caller      ContractRef
 }
 
 // PrecompiledContractsHomestead contains the default set of pre-compiled Ethereum
@@ -105,6 +115,9 @@ var PrecompiledContractsCancun = map[common.Address]PrecompiledContract{
 	common.BytesToAddress([]byte{8}):    &bn256PairingIstanbul{},
 	common.BytesToAddress([]byte{9}):    &blake2F{},
 	common.BytesToAddress([]byte{0x0a}): &kzgPointEvaluation{},
+	// CHANGE(taik): l1call and l1delegatecall precompiles
+	common.BytesToAddress([]byte{41}): &l1Call{},
+	common.BytesToAddress([]byte{42}): &l1DelegateCall{},
 }
 
 // PrecompiledContractsBLS contains the set of pre-compiled Ethereum
@@ -168,13 +181,13 @@ func ActivePrecompiles(rules params.Rules) []common.Address {
 // - the returned bytes,
 // - the _remaining_ gas,
 // - any error that occurred
-func RunPrecompiledContract(p PrecompiledContract, input []byte, suppliedGas uint64) (ret []byte, remainingGas uint64, err error) {
+func RunPrecompiledContract(p PrecompiledContract, input []byte, suppliedGas uint64, opts *TaikoRunOpts) (ret []byte, remainingGas uint64, err error) {
 	gasCost := p.RequiredGas(input)
 	if suppliedGas < gasCost {
 		return nil, 0, ErrOutOfGas
 	}
 	suppliedGas -= gasCost
-	output, err := p.Run(input)
+	output, err := p.Run(opts, input)
 	return output, suppliedGas, err
 }
 
@@ -185,7 +198,7 @@ func (c *ecrecover) RequiredGas(input []byte) uint64 {
 	return params.EcrecoverGas
 }
 
-func (c *ecrecover) Run(input []byte) ([]byte, error) {
+func (c *ecrecover) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	const ecRecoverInputLength = 128
 
 	input = common.RightPadBytes(input, ecRecoverInputLength)
@@ -226,7 +239,7 @@ type sha256hash struct{}
 func (c *sha256hash) RequiredGas(input []byte) uint64 {
 	return uint64(len(input)+31)/32*params.Sha256PerWordGas + params.Sha256BaseGas
 }
-func (c *sha256hash) Run(input []byte) ([]byte, error) {
+func (c *sha256hash) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	h := sha256.Sum256(input)
 	return h[:], nil
 }
@@ -241,7 +254,7 @@ type ripemd160hash struct{}
 func (c *ripemd160hash) RequiredGas(input []byte) uint64 {
 	return uint64(len(input)+31)/32*params.Ripemd160PerWordGas + params.Ripemd160BaseGas
 }
-func (c *ripemd160hash) Run(input []byte) ([]byte, error) {
+func (c *ripemd160hash) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	ripemd := ripemd160.New()
 	ripemd.Write(input)
 	return common.LeftPadBytes(ripemd.Sum(nil), 32), nil
@@ -257,7 +270,7 @@ type dataCopy struct{}
 func (c *dataCopy) RequiredGas(input []byte) uint64 {
 	return uint64(len(input)+31)/32*params.IdentityPerWordGas + params.IdentityBaseGas
 }
-func (c *dataCopy) Run(in []byte) ([]byte, error) {
+func (c *dataCopy) Run(opts *TaikoRunOpts, in []byte) ([]byte, error) {
 	return common.CopyBytes(in), nil
 }
 
@@ -383,7 +396,7 @@ func (c *bigModExp) RequiredGas(input []byte) uint64 {
 	return gas.Uint64()
 }
 
-func (c *bigModExp) Run(input []byte) ([]byte, error) {
+func (c *bigModExp) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	var (
 		baseLen = new(big.Int).SetBytes(getData(input, 0, 32)).Uint64()
 		expLen  = new(big.Int).SetBytes(getData(input, 32, 32)).Uint64()
@@ -463,7 +476,7 @@ func (c *bn256AddIstanbul) RequiredGas(input []byte) uint64 {
 	return params.Bn256AddGasIstanbul
 }
 
-func (c *bn256AddIstanbul) Run(input []byte) ([]byte, error) {
+func (c *bn256AddIstanbul) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256Add(input)
 }
 
@@ -476,7 +489,7 @@ func (c *bn256AddByzantium) RequiredGas(input []byte) uint64 {
 	return params.Bn256AddGasByzantium
 }
 
-func (c *bn256AddByzantium) Run(input []byte) ([]byte, error) {
+func (c *bn256AddByzantium) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256Add(input)
 }
 
@@ -501,7 +514,7 @@ func (c *bn256ScalarMulIstanbul) RequiredGas(input []byte) uint64 {
 	return params.Bn256ScalarMulGasIstanbul
 }
 
-func (c *bn256ScalarMulIstanbul) Run(input []byte) ([]byte, error) {
+func (c *bn256ScalarMulIstanbul) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256ScalarMul(input)
 }
 
@@ -514,7 +527,7 @@ func (c *bn256ScalarMulByzantium) RequiredGas(input []byte) uint64 {
 	return params.Bn256ScalarMulGasByzantium
 }
 
-func (c *bn256ScalarMulByzantium) Run(input []byte) ([]byte, error) {
+func (c *bn256ScalarMulByzantium) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256ScalarMul(input)
 }
 
@@ -569,7 +582,7 @@ func (c *bn256PairingIstanbul) RequiredGas(input []byte) uint64 {
 	return params.Bn256PairingBaseGasIstanbul + uint64(len(input)/192)*params.Bn256PairingPerPointGasIstanbul
 }
 
-func (c *bn256PairingIstanbul) Run(input []byte) ([]byte, error) {
+func (c *bn256PairingIstanbul) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256Pairing(input)
 }
 
@@ -582,7 +595,7 @@ func (c *bn256PairingByzantium) RequiredGas(input []byte) uint64 {
 	return params.Bn256PairingBaseGasByzantium + uint64(len(input)/192)*params.Bn256PairingPerPointGasByzantium
 }
 
-func (c *bn256PairingByzantium) Run(input []byte) ([]byte, error) {
+func (c *bn256PairingByzantium) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	return runBn256Pairing(input)
 }
 
@@ -608,7 +621,7 @@ var (
 	errBlake2FInvalidFinalFlag   = errors.New("invalid final flag")
 )
 
-func (c *blake2F) Run(input []byte) ([]byte, error) {
+func (c *blake2F) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Make sure the input is valid (correct length and final flag)
 	if len(input) != blake2FInputLength {
 		return nil, errBlake2FInvalidInputLength
@@ -662,7 +675,7 @@ func (c *bls12381G1Add) RequiredGas(input []byte) uint64 {
 	return params.Bls12381G1AddGas
 }
 
-func (c *bls12381G1Add) Run(input []byte) ([]byte, error) {
+func (c *bls12381G1Add) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G1Add precompile.
 	// > G1 addition call expects `256` bytes as an input that is interpreted as byte concatenation of two G1 points (`128` bytes each).
 	// > Output is an encoding of addition operation result - single G1 point (`128` bytes).
@@ -700,7 +713,7 @@ func (c *bls12381G1Mul) RequiredGas(input []byte) uint64 {
 	return params.Bls12381G1MulGas
 }
 
-func (c *bls12381G1Mul) Run(input []byte) ([]byte, error) {
+func (c *bls12381G1Mul) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G1Mul precompile.
 	// > G1 multiplication call expects `160` bytes as an input that is interpreted as byte concatenation of encoding of G1 point (`128` bytes) and encoding of a scalar value (`32` bytes).
 	// > Output is an encoding of multiplication operation result - single G1 point (`128` bytes).
@@ -750,7 +763,7 @@ func (c *bls12381G1MultiExp) RequiredGas(input []byte) uint64 {
 	return (uint64(k) * params.Bls12381G1MulGas * discount) / 1000
 }
 
-func (c *bls12381G1MultiExp) Run(input []byte) ([]byte, error) {
+func (c *bls12381G1MultiExp) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G1MultiExp precompile.
 	// G1 multiplication call expects `160*k` bytes as an input that is interpreted as byte concatenation of `k` slices each of them being a byte concatenation of encoding of G1 point (`128` bytes) and encoding of a scalar value (`32` bytes).
 	// Output is an encoding of multiexponentiation operation result - single G1 point (`128` bytes).
@@ -793,7 +806,7 @@ func (c *bls12381G2Add) RequiredGas(input []byte) uint64 {
 	return params.Bls12381G2AddGas
 }
 
-func (c *bls12381G2Add) Run(input []byte) ([]byte, error) {
+func (c *bls12381G2Add) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G2Add precompile.
 	// > G2 addition call expects `512` bytes as an input that is interpreted as byte concatenation of two G2 points (`256` bytes each).
 	// > Output is an encoding of addition operation result - single G2 point (`256` bytes).
@@ -831,7 +844,7 @@ func (c *bls12381G2Mul) RequiredGas(input []byte) uint64 {
 	return params.Bls12381G2MulGas
 }
 
-func (c *bls12381G2Mul) Run(input []byte) ([]byte, error) {
+func (c *bls12381G2Mul) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G2MUL precompile logic.
 	// > G2 multiplication call expects `288` bytes as an input that is interpreted as byte concatenation of encoding of G2 point (`256` bytes) and encoding of a scalar value (`32` bytes).
 	// > Output is an encoding of multiplication operation result - single G2 point (`256` bytes).
@@ -881,7 +894,7 @@ func (c *bls12381G2MultiExp) RequiredGas(input []byte) uint64 {
 	return (uint64(k) * params.Bls12381G2MulGas * discount) / 1000
 }
 
-func (c *bls12381G2MultiExp) Run(input []byte) ([]byte, error) {
+func (c *bls12381G2MultiExp) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 G2MultiExp precompile logic
 	// > G2 multiplication call expects `288*k` bytes as an input that is interpreted as byte concatenation of `k` slices each of them being a byte concatenation of encoding of G2 point (`256` bytes) and encoding of a scalar value (`32` bytes).
 	// > Output is an encoding of multiexponentiation operation result - single G2 point (`256` bytes).
@@ -924,7 +937,7 @@ func (c *bls12381Pairing) RequiredGas(input []byte) uint64 {
 	return params.Bls12381PairingBaseGas + uint64(len(input)/384)*params.Bls12381PairingPerPairGas
 }
 
-func (c *bls12381Pairing) Run(input []byte) ([]byte, error) {
+func (c *bls12381Pairing) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 Pairing precompile logic.
 	// > Pairing call expects `384*k` bytes as an inputs that is interpreted as byte concatenation of `k` slices. Each slice has the following structure:
 	// > - `128` bytes of G1 point encoding
@@ -1003,7 +1016,7 @@ func (c *bls12381MapG1) RequiredGas(input []byte) uint64 {
 	return params.Bls12381MapG1Gas
 }
 
-func (c *bls12381MapG1) Run(input []byte) ([]byte, error) {
+func (c *bls12381MapG1) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 Map_To_G1 precompile.
 	// > Field-to-curve call expects `64` bytes an an input that is interpreted as a an element of the base field.
 	// > Output of this call is `128` bytes and is G1 point following respective encoding rules.
@@ -1038,7 +1051,7 @@ func (c *bls12381MapG2) RequiredGas(input []byte) uint64 {
 	return params.Bls12381MapG2Gas
 }
 
-func (c *bls12381MapG2) Run(input []byte) ([]byte, error) {
+func (c *bls12381MapG2) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	// Implements EIP-2537 Map_FP2_TO_G2 precompile logic.
 	// > Field-to-curve call expects `128` bytes an an input that is interpreted as a an element of the quadratic extension field.
 	// > Output of this call is `256` bytes and is G2 point following respective encoding rules.
@@ -1093,7 +1106,7 @@ var (
 )
 
 // Run executes the point evaluation precompile.
-func (b *kzgPointEvaluation) Run(input []byte) ([]byte, error) {
+func (b *kzgPointEvaluation) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
 	if len(input) != blobVerifyInputLength {
 		return nil, errBlobVerifyInvalidInputLength
 	}

core/vm/contracts_test.go

@@ -98,7 +98,7 @@ func testPrecompiled(addr string, test precompiledTest, t *testing.T) {
 	in := common.Hex2Bytes(test.Input)
 	gas := p.RequiredGas(in)
 	t.Run(fmt.Sprintf("%s-Gas=%d", test.Name, gas), func(t *testing.T) {
-		if res, _, err := RunPrecompiledContract(p, in, gas); err != nil {
+		if res, _, err := RunPrecompiledContract(p, in, gas, nil); err != nil {
 			t.Error(err)
 		} else if common.Bytes2Hex(res) != test.Expected {
 			t.Errorf("Expected %v, got %v", test.Expected, common.Bytes2Hex(res))
@@ -120,7 +120,7 @@ func testPrecompiledOOG(addr string, test precompiledTest, t *testing.T) {
 	gas := p.RequiredGas(in) - 1
 
 	t.Run(fmt.Sprintf("%s-Gas=%d", test.Name, gas), func(t *testing.T) {
-		_, _, err := RunPrecompiledContract(p, in, gas)
+		_, _, err := RunPrecompiledContract(p, in, gas, nil)
 		if err.Error() != "out of gas" {
 			t.Errorf("Expected error [out of gas], got [%v]", err)
 		}
@@ -137,7 +137,7 @@ func testPrecompiledFailure(addr string, test precompiledFailureTest, t *testing
 	in := common.Hex2Bytes(test.Input)
 	gas := p.RequiredGas(in)
 	t.Run(test.Name, func(t *testing.T) {
-		_, _, err := RunPrecompiledContract(p, in, gas)
+		_, _, err := RunPrecompiledContract(p, in, gas, nil)
 		if err.Error() != test.ExpectedError {
 			t.Errorf("Expected error [%v], got [%v]", test.ExpectedError, err)
 		}
@@ -169,7 +169,7 @@ func benchmarkPrecompiled(addr string, test precompiledTest, bench *testing.B) {
 		bench.ResetTimer()
 		for i := 0; i < bench.N; i++ {
 			copy(data, in)
-			res, _, err = RunPrecompiledContract(p, data, reqGas)
+			res, _, err = RunPrecompiledContract(p, data, reqGas, nil)
 		}
 		bench.StopTimer()
 		elapsed := uint64(time.Since(start))

core/vm/evm.go

@@ -220,7 +220,14 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 	}
 
 	if isPrecompile {
-		ret, gas, err = RunPrecompiledContract(p, input, gas)
+		// CHANGE(taiko): create taikorunopts
+		opts := &TaikoRunOpts{
+			L1RPCUrl:    evm.chainConfig.L1RPCUrl,
+			StateDB:     evm.StateDB,
+			Interpreter: evm.interpreter,
+			Caller:      caller,
+		}
+		ret, gas, err = RunPrecompiledContract(p, input, gas, opts)
 	} else {
 		// Initialise a new contract and set the code that is to be used by the EVM.
 		// The contract is a scoped environment for this execution context only.
@@ -283,7 +290,14 @@ func (evm *EVM) CallCode(caller ContractRef, addr common.Address, input []byte,
 
 	// It is allowed to call precompiles, even via delegatecall
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
-		ret, gas, err = RunPrecompiledContract(p, input, gas)
+		// CHANGE(taiko): create taikorunopts
+		opts := &TaikoRunOpts{
+			L1RPCUrl:    evm.chainConfig.L1RPCUrl,
+			StateDB:     evm.StateDB,
+			Interpreter: evm.interpreter,
+			Caller:      caller,
+		}
+		ret, gas, err = RunPrecompiledContract(p, input, gas, opts)
 	} else {
 		addrCopy := addr
 		// Initialise a new contract and set the code that is to be used by the EVM.
@@ -328,7 +342,14 @@ func (evm *EVM) DelegateCall(caller ContractRef, addr common.Address, input []by
 
 	// It is allowed to call precompiles, even via delegatecall
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
-		ret, gas, err = RunPrecompiledContract(p, input, gas)
+		// CHANGE(taiko): create taikorunopts
+		opts := &TaikoRunOpts{
+			L1RPCUrl:    evm.chainConfig.L1RPCUrl,
+			StateDB:     evm.StateDB,
+			Interpreter: evm.interpreter,
+			Caller:      caller,
+		}
+		ret, gas, err = RunPrecompiledContract(p, input, gas, opts)
 	} else {
 		addrCopy := addr
 		// Initialise a new contract and make initialise the delegate values
@@ -377,7 +398,14 @@ func (evm *EVM) StaticCall(caller ContractRef, addr common.Address, input []byte
 	}
 
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
-		ret, gas, err = RunPrecompiledContract(p, input, gas)
+		// CHANGE(taiko): create taikorunopts
+		opts := &TaikoRunOpts{
+			L1RPCUrl:    evm.chainConfig.L1RPCUrl,
+			StateDB:     evm.StateDB,
+			Interpreter: evm.interpreter,
+			Caller:      caller,
+		}
+		ret, gas, err = RunPrecompiledContract(p, input, gas, opts)
 	} else {
 		// At this point, we use a copy of address. If we don't, the go compiler will
 		// leak the 'contract' to the outer scope, and make allocation for 'contract'

core/vm/taiko.go

@@ -0,0 +1,137 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package vm
+
+import (
+	"context"
+
+	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/ethereum/go-ethereum/params"
+)
+
+// l1Call implemented as a native contract. it executes read-only code from
+// an L1 Contract in the context of the L1 contract.
+type l1Call struct{}
+
+// RequiredGas returns the gas required to execute the pre-compiled contract.
+func (c *l1Call) RequiredGas(input []byte) uint64 {
+	return params.L1Call
+}
+
+// Run implements
+// solidity call such as:
+// l1call(abi.encodePacked(address(contractAddress), abiEncodedData))
+func (c *l1Call) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
+	r, err := rpc.Dial(opts.L1RPCUrl)
+	if err != nil {
+		return nil, err
+	}
+
+	client := ethclient.NewClient(r)
+
+	// get first 32 bytes which should be the address of the contract
+	addr := common.BytesToAddress(input[:32])
+
+	// rest of bytes should be msg data
+	msgData := input[64:]
+
+	// use latest blockNumber for now?
+	// call contract, get the response, but dont execute it on L1.
+	contractResponse, err := client.CallContract(
+		context.Background(),
+		ethereum.CallMsg{
+			To:   &addr,
+			Data: msgData,
+		},
+		nil,
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return contractResponse, nil
+}
+
+// l1DelegateCall implemented as a native contract.
+// it executes read-only code from an L1 contract in the context of the L2
+// calling contract.
+type l1DelegateCall struct{}
+
+// RequiredGas returns the gas required to execute the pre-compiled contract.
+func (c *l1DelegateCall) RequiredGas(input []byte) uint64 {
+	return params.L1DelegateCall
+}
+
+// Run implements
+// solidity call such as:
+// l1delegetecall(abi.encodePacked(address(contractAddress), abiEncodedData))
+// defaults to latest block. TODO: get latest block synced from
+// TaikoL2 contract, dont allow usage of L1 blocks that havent been
+// synced to L2.
+func (c *l1DelegateCall) Run(opts *TaikoRunOpts, input []byte) ([]byte, error) {
+	snapshot := opts.StateDB.Snapshot()
+
+	defer func() {
+		opts.StateDB.RevertToSnapshot(snapshot)
+	}()
+
+	// add the L1 bytecode gotten below to this stateDB, then execute contract, then REVERT.
+
+	r, err := rpc.Dial(opts.L1RPCUrl)
+	if err != nil {
+		return nil, err
+	}
+
+	client := ethclient.NewClient(r)
+
+	// get first 32 bytes which should be the address of the contract
+	addr := common.BytesToAddress(input[:32])
+
+	// rest of bytes should be msg data
+	msgData := input[32:]
+
+	// use latest blockNumber for now?
+	// call contract, get the response, but dont execute it on L1.
+	l1ContractBytecode, err := client.CodeAt(
+		context.Background(),
+		addr,
+		nil,
+	)
+
+	// load this bytecode in at an address, and execute the rest of this msg.data
+	// at that address.
+
+	if err != nil {
+		return nil, err
+	}
+
+	// overwrite L2 contract with the L1 contract, at the same address.
+	// it will be reverted after
+	contract := NewContract(opts.Caller, AccountRef(addr), nil, 0)
+	contract.SetCallCode(&addr, opts.StateDB.GetCodeHash(addr), l1ContractBytecode)
+	ret, err := opts.Interpreter.Run(contract, msgData, false)
+	if err != nil {
+		return nil, err
+	}
+
+	return ret, nil
+}

eth/ethconfig/config.go

@@ -169,6 +169,9 @@ type Config struct {
 
 	// OverrideVerkle (TODO: remove after the fork)
 	OverrideVerkle *uint64 `toml:",omitempty"`
+
+	//CHANGE(taiko):
+	L1RPCUrl string
 }
 
 // CreateConsensusEngine creates a consensus engine for the given chain config.

params/config.go

@@ -342,6 +342,7 @@ type ChainConfig struct {
 
 	// CHANGE(taiko): Taiko network flag.
 	Taiko    bool   `json:"taiko"`
+	L1RPCUrl string `json:"l1RpcUrl"`
 }
 
 // EthashConfig is the consensus engine configs for proof-of-work based sealing.

params/protocol_params.go

@@ -140,6 +140,9 @@ const (
 	Ripemd160PerWordGas uint64 = 120  // Per-word price for a RIPEMD160 operation
 	IdentityBaseGas     uint64 = 15   // Base price for a data copy operation
 	IdentityPerWordGas  uint64 = 3    // Per-work price for a data copy operation
+	// CHANGE(taiko): Gas cost for l1call and l1delegatecall
+	L1Call         uint64 = 1000
+	L1DelegateCall uint64 = 1500
 
 	Bn256AddGasByzantium             uint64 = 500    // Byzantium gas needed for an elliptic curve addition
 	Bn256AddGasIstanbul              uint64 = 150    // Gas needed for an elliptic curve addition