Fix NaCl regression caused by pepper revision 28.

Patch from bradchen@chromium.org.

Prevents use of PROT_EXEC for NaCl builds

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/19729003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15744 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/deoptimizer.cc

@@ -43,7 +43,13 @@ namespace internal {
 static MemoryChunk* AllocateCodeChunk(MemoryAllocator* allocator) {
   return allocator->AllocateChunk(Deoptimizer::GetMaxDeoptTableSize(),
                                   OS::CommitPageSize(),
+#if defined(__native_client__)
+  // The Native Client port of V8 uses an interpreter,
+  // so code pages don't need PROT_EXEC.
+                                  NOT_EXECUTABLE,
+#else
                                   EXECUTABLE,
+#endif
                                   NULL);
 }
 

src/platform-linux.cc

@@ -594,7 +594,13 @@ void OS::SignalCodeMovingGC() {
   }
   void* addr = mmap(OS::GetRandomMmapAddr(),
                     size,
+#if defined(__native_client__)
+                    // The Native Client port of V8 uses an interpreter,
+                    // so code pages don't need PROT_EXEC.
+                    PROT_READ,
+#else
                     PROT_READ | PROT_EXEC,
+#endif
                     MAP_PRIVATE,
                     fileno(f),
                     0);
@@ -717,7 +723,13 @@ void* VirtualMemory::ReserveRegion(size_t size) {
 
 
 bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
+#if defined(__native_client__)
+  // The Native Client port of V8 uses an interpreter,
+  // so code pages don't need PROT_EXEC.
+  int prot = PROT_READ | PROT_WRITE;
+#else
   int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
+#endif
   if (MAP_FAILED == mmap(base,
                          size,
                          prot,

src/platform-posix.cc

@@ -84,7 +84,13 @@ intptr_t OS::CommitPageSize() {
 #ifndef __CYGWIN__
 // Get rid of writable permission on code allocations.
 void OS::ProtectCode(void* address, const size_t size) {
+#if defined(__native_client__)
+  // The Native Client port of V8 uses an interpreter, so
+  // code pages don't need PROT_EXEC.
+  mprotect(address, size, PROT_READ);
+#else
   mprotect(address, size, PROT_READ | PROT_EXEC);
+#endif
 }