--- dyld/dyld-1235.2/cache_builder/NewSharedCacheBuilder.cpp
+++ dyld/dyld-1245.1/cache_builder/NewSharedCacheBuilder.cpp
@@ -3052,6 +3052,43 @@
                         break;
                     }
                     case cache_builder::Region::Kind::readOnly:
+                    case cache_builder::Region::Kind::linkedit:
+                    case cache_builder::Region::Kind::unmapped:
+                    case cache_builder::Region::Kind::dynamicConfig:
+                    case cache_builder::Region::Kind::codeSignature:
+                    case cache_builder::Region::Kind::numKinds:
+                        break;
+                }
+            }
+        }
+
+        // Also split the current file so that read-only are in their own files
+        {
+            // Create a new subCache
+            newSubCaches.push_back(SubCache::makeSubCache(options));
+            SubCache& newSubCache = newSubCaches.back();
+
+            // Move all data to the new subCache
+            for ( Region& oldRegion : subCache.regions ) {
+                if ( oldRegion.chunks.empty() )
+                    continue;
+
+                // Move all the data regions, leave the rest
+                switch ( oldRegion.kind ) {
+                    case cache_builder::Region::Kind::text:
+                    case cache_builder::Region::Kind::dataConst:
+                    case cache_builder::Region::Kind::tproConst:
+                    case cache_builder::Region::Kind::data:
+                    case cache_builder::Region::Kind::auth:
+                    case cache_builder::Region::Kind::authConst:
+                    case cache_builder::Region::Kind::tproAuthConst:
+                        // Nothing to do here
+                        break;
+                    case cache_builder::Region::Kind::readOnly:{
+                        Region& newRegion = newSubCache.regions[(uint32_t)oldRegion.kind];
+                        newRegion.chunks = std::move(oldRegion.chunks);
+                        break;
+                    }
                     case cache_builder::Region::Kind::linkedit:
                     case cache_builder::Region::Kind::unmapped:
                     case cache_builder::Region::Kind::dynamicConfig:
@@ -7830,11 +7867,6 @@
     // We must be a largeContiguous cache. Others were dealt with above in the x86_64 and/or sim cases
     assert(this->config.layout.contiguous.has_value());
 
-    // Some caches have a fixed max slide
-    if ( this->config.layout.cacheFixedSlide.has_value() ) {
-        return this->config.layout.cacheFixedSlide.value();
-    }
-
     // Start off making sure we can't slide past the end of the cache
     CacheVMAddress maxVMAddress(0ULL);
     for ( const Region& region : this->subCaches.back().regions ) {