Correct arm64 SignExtension (dotnet#110635)

* correct arm64 SignExtension * check for the 28th bit
mikelle-rogers · Dec 12, 2024 · 43b89b4 · 43b89b4
1 parent f0e64f5
commit 43b89b4
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/coreclr/debug/ee/arm64/walker.cpp b/src/coreclr/debug/ee/arm64/walker.cpp
@@ -278,9 +278,9 @@ BOOL  NativeWalker::DecodePCRelativeBranchInst(PT_CONTEXT context, const PRD_TYP
     {
         offset = (opcode & 0x03FFFFFF) << 2;
         // Sign extension
-        if ((offset & 0x4000000)) //Check for 26'st bit
+        if ((offset & 0x8000000)) //Check for (26 + 2)'st bit
         {
-            offset = offset | 0xFFFFFFFFF8000000;
+            offset = offset | 0xFFFFFFFFF0000000;
         }
 
         if ((opcode & 0x80000000) != 0) //BL