src/v8/src/mips/cpu-mips.cc

// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// CPU specific code for arm independent of OS goes here.

// Starboard implementation will use SbMemoryFlush().
#if !defined(V8_OS_STARBOARD)
#include <sys/syscall.h>
#include <unistd.h>

#ifdef __mips
#include <asm/cachectl.h>
#endif  // #ifdef __mips
#endif  // !defined(V8_OS_STARBOARD)

#if V8_TARGET_ARCH_MIPS

#include "src/assembler.h"
#include "src/macro-assembler.h"

#include "src/simulator.h"  // For cache flushing.

namespace v8 {
namespace internal {


void CpuFeatures::FlushICache(void* start, size_t size) {
#if !defined(USE_SIMULATOR)
  // Nothing to do, flushing no instructions.
  if (size == 0) {
    return;
  }

#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);
#elif defined(V8_OS_STARBOARD)
  // SbMemoryFlush uses BCACHE as argument for _flush_cache() call.
  // This should not affect performance, since MIPS kernel only uses BCACHE,
  // according to:
  // https://elixir.bootlin.com/linux/latest/source/arch/mips/mm/cache.c#L74
  SbMemoryFlush(start, size);
#else  // ANDROID
  int res;
  // 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
#endif  // !USE_SIMULATOR.
}

}  // namespace internal
}  // namespace v8

#endif  // V8_TARGET_ARCH_MIPS