Preliminary support for systems which require changing JIT memory regions privilege from read / write to read / executable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56303 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/System/Memory.cpp b/lib/System/Memory.cpp
index 3660bcb1a4..2fc6a23a3a 100644
--- a/lib/System/Memory.cpp
+++ b/lib/System/Memory.cpp
@@ -58,3 +58,14 @@ void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
 #endif  // end PPC
 
 }
+
+bool llvm::sys::Memory::SetRXPrivilege(const void *Addr, size_t Size) {
+#if defined(__APPLE__) && defined(__arm__)
+  kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)Addr,
+                                (vm_size_t)Size, 0,
+                                VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
+  return KERN_SUCCESS == kr;
+#else
+  return true;
+#endif
+}