Revert "[release/6.0] Fix ReadyToRun loading on Apple Silicon (#64104)"

This reverts commit 8f7dff3.

Author: mangod9

src/coreclr/jit/importer.cpp

@@ -6960,9 +6960,7 @@ void Compiler::impImportNewObjArray(CORINFO_RESOLVED_TOKEN* pResolvedToken, CORI
     //
     CLANG_FORMAT_COMMENT_ANCHOR;
 
-#ifndef OSX_ARM64_ABI
     if (!opts.IsReadyToRun() || IsTargetAbi(CORINFO_CORERT_ABI))
-#endif // !OSX_ARM64_ABI
     {
 
         // Reuse the temp used to pass the array dimensions to avoid bloating
@@ -7019,7 +7017,6 @@ void Compiler::impImportNewObjArray(CORINFO_RESOLVED_TOKEN* pResolvedToken, CORI
 
         node = gtNewHelperCallNode(CORINFO_HELP_NEW_MDARR_NONVARARG, TYP_REF, args);
     }
-#ifndef OSX_ARM64_ABI
     else
     {
         //
@@ -7049,7 +7046,6 @@ void Compiler::impImportNewObjArray(CORINFO_RESOLVED_TOKEN* pResolvedToken, CORI
         }
 #endif
     }
-#endif // !OSX_ARM64_ABI
 
     for (GenTreeCall::Use& use : node->AsCall()->Args())
     {

src/coreclr/pal/src/map/map.cpp

@@ -2047,9 +2047,9 @@ MAPmmapAndRecord(
 
         // Set the requested mapping with forced PROT_WRITE to ensure data from the file can be read there,
         // read the data in and finally remove the forced PROT_WRITE
-        if ((mprotect(pvBaseAddress, len + adjust, PROT_WRITE) == -1) ||
+        if ((mprotect(pvBaseAddress, len + adjust, prot | PROT_WRITE) == -1) ||
             (pread(fd, pvBaseAddress, len + adjust, offset - adjust) == -1) ||
-            (mprotect(pvBaseAddress, len + adjust, prot) == -1))
+            (((prot & PROT_WRITE) == 0) && mprotect(pvBaseAddress, len + adjust, prot) == -1))
         {
             palError = FILEGetLastErrorFromErrno();
         }

src/coreclr/vm/jitinterface.cpp

@@ -14200,13 +14200,6 @@ BOOL LoadDynamicInfoEntry(Module *currentModule,
             CorInfoHelpFunc corInfoHelpFunc = MapReadyToRunHelper((ReadyToRunHelper)helperNum);
             if (corInfoHelpFunc != CORINFO_HELP_UNDEF)
             {
-#ifdef OSX_ARM64_ABI
-                if (corInfoHelpFunc == CORINFO_HELP_NEW_MDARR)
-                {
-                    STRESS_LOG(LF_ZAP, LL_WARNING, "CORINFO_HELP_NEW_MDARR is not supported on osx-arm64\n");
-                    return FALSE;
-                }
-#endif // OSX_ARM64_ABI
                 result = (size_t)CEEJitInfo::getHelperFtnStatic(corInfoHelpFunc);
             }
             else

src/coreclr/vm/peimagelayout.cpp

@@ -235,14 +235,14 @@ void PEImageLayout::ApplyBaseRelocations()
             if (((pSection->Characteristics & VAL32(IMAGE_SCN_MEM_WRITE)) == 0))
             {
                 DWORD dwNewProtection = PAGE_READWRITE;
-#if defined(TARGET_UNIX) && !defined(CROSSGEN_COMPILE) && !defined(__APPLE__)
+#if defined(TARGET_UNIX) && !defined(CROSSGEN_COMPILE)
                 if (((pSection->Characteristics & VAL32(IMAGE_SCN_MEM_EXECUTE)) != 0))
                 {
                     // On SELinux, we cannot change protection that doesn't have execute access rights
                     // to one that has it, so we need to set the protection to RWX instead of RW
                     dwNewProtection = PAGE_EXECUTE_READWRITE;
                 }
-#endif // TARGET_UNIX && !CROSSGEN_COMPILE && !__APPLE__
+#endif // TARGET_UNIX && !CROSSGEN_COMPILE
                 if (!ClrVirtualProtect(pWriteableRegion, cbWriteableRegion,
                                        dwNewProtection, &dwOldProtection))
                     ThrowLastError();