Increase ARM/MIPS simulators stack safety margin to 512 bytes

src/arm/simulator-arm.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 1250 matching lines @@
     return;
   }
   PrintF("Unaligned write at 0x%08x\n", addr);
   UNIMPLEMENTED();
 #endif
 }
 
 
 // Returns the limit of the stack area to enable checking for stack overflows.
 uintptr_t Simulator::StackLimit() const {
-  // Leave a safety margin of 256 bytes to prevent overrunning the stack when
+  // Leave a safety margin of 512 bytes to prevent overrunning the stack when
   // pushing values.
-  return reinterpret_cast<uintptr_t>(stack_) + 256;
+  return reinterpret_cast<uintptr_t>(stack_) + 512;
 }
 
 
 // Unsupported instructions use Format to print an error and stop execution.
 void Simulator::Format(Instruction* instr, const char* format) {
   PrintF("Simulator found unsupported instruction:\n 0x%08x: %s\n",
          reinterpret_cast<intptr_t>(instr), format);
   UNIMPLEMENTED();
 }
 
@@ skipping 2133 matching lines @@
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM