llvm/compiler-rt/lib/builtins/clear_cache.c

//===-- clear_cache.c - Implement __clear_cache ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"
#if defined(__linux__)
#include <assert.h>
#endif
#include <stddef.h>

#if __APPLE__
#include <libkern/OSCacheControl.h>
#endif

#if defined(_WIN32)
// Forward declare Win32 APIs since the GCC mode driver does not handle the
// newer SDKs as well as needed.
uint32_t FlushInstructionCache(uintptr_t hProcess, void *lpBaseAddress,
                               uintptr_t dwSize);
uintptr_t GetCurrentProcess(void);
#endif

#if defined(__FreeBSD__) && defined(__arm__)
// clang-format off
#include <sys/types.h>
#include <machine/sysarch.h>
// clang-format on
#endif

#if defined(__NetBSD__) && defined(__arm__)
#include <machine/sysarch.h>
#endif

#if defined(__OpenBSD__) && (defined(__arm__) || defined(__mips__) || defined(__riscv))
// clang-format off
#include <sys/types.h>
#include <machine/sysarch.h>
// clang-format on
#endif

#if defined(__linux__) && defined(__mips__)
#include <sys/cachectl.h>
#include <sys/syscall.h>
#include <unistd.h>
#endif

#if defined(__linux__) && defined(__riscv)
// to get platform-specific syscall definitions
#include <linux/unistd.h>
#endif

// The compiler generates calls to __clear_cache() when creating
// trampoline functions on the stack for use with nested functions.
// It is expected to invalidate the instruction cache for the
// specified range.

void __clear_cache(void *start, void *end) { … }