From af4a3b0f9fea88195564e5462a2aa1d2689abed2 Mon Sep 17 00:00:00 2001
From: Daniel Liu <liudaniel@qq.com>
Date: Mon, 10 Feb 2025 09:18:25 +0800
Subject: [PATCH] core/vm: implement BLOBBASEFEE opcode 0x4a (#28098)

---
 core/vm/eips.go       | 17 +++++++++++++++++
 core/vm/jump_table.go |  1 +
 core/vm/opcodes.go    |  3 +++
 3 files changed, 21 insertions(+)

diff --git a/core/vm/eips.go b/core/vm/eips.go
index 99b25c5252..c229dd25aa 100644
--- a/core/vm/eips.go
+++ b/core/vm/eips.go
@@ -256,6 +256,23 @@ func opMcopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]by
 	return nil, nil
 }
 
+// opBlobBaseFee implements BLOBBASEFEE opcode
+func opBlobBaseFee(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	blobBaseFee := new(uint256.Int)
+	scope.Stack.push(blobBaseFee)
+	return nil, nil
+}
+
+// enable7516 applies EIP-7516 (BLOBBASEFEE opcode)
+func enable7516(jt *JumpTable) {
+	jt[BLOBBASEFEE] = &operation{
+		execute:     opBlobBaseFee,
+		constantGas: GasQuickStep,
+		minStack:    minStack(0, 1),
+		maxStack:    maxStack(0, 1),
+	}
+}
+
 // enable6780 applies EIP-6780 (deactivate SELFDESTRUCT)
 func enable6780(jt *JumpTable) {
 	jt[SELFDESTRUCT] = &operation{
diff --git a/core/vm/jump_table.go b/core/vm/jump_table.go
index 3797b01cac..667778e73a 100644
--- a/core/vm/jump_table.go
+++ b/core/vm/jump_table.go
@@ -82,6 +82,7 @@ func validate(jt JumpTable) JumpTable {
 
 func newCancunInstructionSet() JumpTable {
 	instructionSet := newEip1559InstructionSet()
+	enable7516(&instructionSet) // EIP-7516 (BLOBBASEFEE opcode)
 	enable1153(&instructionSet) // EIP-1153 "Transient Storage"
 	enable5656(&instructionSet) // EIP-5656 (MCOPY opcode)
 	enable6780(&instructionSet) // EIP-6780 SELFDESTRUCT only in same transaction
diff --git a/core/vm/opcodes.go b/core/vm/opcodes.go
index c2e7bba897..75a0e31d41 100644
--- a/core/vm/opcodes.go
+++ b/core/vm/opcodes.go
@@ -100,6 +100,7 @@ const (
 	CHAINID     OpCode = 0x46
 	SELFBALANCE OpCode = 0x47
 	BASEFEE     OpCode = 0x48
+	BLOBBASEFEE OpCode = 0x4a
 )
 
 // 0x50 range - 'storage' and execution.
@@ -284,6 +285,7 @@ var opCodeToString = [256]string{
 	CHAINID:     "CHAINID",
 	SELFBALANCE: "SELFBALANCE",
 	BASEFEE:     "BASEFEE",
+	BLOBBASEFEE: "BLOBBASEFEE",
 
 	// 0x50 range - 'storage' and execution.
 	POP:      "POP",
@@ -458,6 +460,7 @@ var stringToOp = map[string]OpCode{
 	"GASLIMIT":       GASLIMIT,
 	"SELFBALANCE":    SELFBALANCE,
 	"BASEFEE":        BASEFEE,
+	"BLOBBASEFEE":    BLOBBASEFEE,
 	"POP":            POP,
 	"MLOAD":          MLOAD,
 	"MSTORE":         MSTORE,