MIPS: Added Android-specific version of cacheflush call.

src/mips/cpu-mips.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 46 matching lines @@
 }
 
 
 void CPU::FlushICache(void* start, size_t size) {
   // Nothing to do, flushing no instructions.
   if (size == 0) {
     return;
   }
 
 #if !defined (USE_SIMULATOR)
+#if defined(ANDROID)
+  // Bionic cacheflush can typically run in userland, avoiding kernel call.
+  char *end = reinterpret_cast<char *>(start) + size;
+  cacheflush(
+    reinterpret_cast<intptr_t>(start), reinterpret_cast<intptr_t>(end), 0);
+#else  // ANDROID
   int res;
-
-  // See http://www.linux-mips.org/wiki/Cacheflush_Syscall.
+  // See http://www.linux-mips.org/wiki/Cacheflush_Syscall .
   res = syscall(__NR_cacheflush, start, size, ICACHE);
-
   if (res) {
     V8_Fatal(__FILE__, __LINE__, "Failed to flush the instruction cache");
   }
-
+#endif  // ANDROID
 #else  // USE_SIMULATOR.
   // Not generating mips instructions for C-code. This means that we are
   // building a mips emulator based target.  We should notify the simulator
   // that the Icache was flushed.
   // None of this code ends up in the snapshot so there are no issues
   // around whether or not to generate the code when building snapshots.
   Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), start, size);
 #endif  // USE_SIMULATOR.
 }
 
 
 void CPU::DebugBreak() {
 #ifdef __mips
   asm volatile("break");
 #endif  // #ifdef __mips
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS