Uses mcopy in ArbOs11TO32UpgradeTest

OffchainLabs · Dec 16, 2024 · 54ec0a9 · 54ec0a9
1 parent cd9b8d6
commit 54ec0a9
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/mocks/ArbOS11To32UpgradeTest.sol b/src/mocks/ArbOS11To32UpgradeTest.sol
@@ -7,7 +7,12 @@ pragma solidity ^0.8.24;
 import "../precompiles/ArbSys.sol";
 
 contract ArbOS11To32UpgradeTest {
-    function mcopy() external view {
+    function mcopy() external returns (bytes32 x) {
+        assembly {
+            mstore(0x20, 0x9)  // Store 0x9 at word 1 in memory
+            mcopy(0, 0x20, 0x20)  // Copies 0x9 to word 0 in memory
+            x := mload(0)    // Returns 32 bytes "0x9"
+        }
         require(ArbSys(address(0x64)).arbOSVersion() == 55 + 32, "EXPECTED_ARBOS_32");
     }
 }