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clear_cache.c
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clear_cache.c
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//===-- 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"
#include <assert.h>
#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(__mips__)
// 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
// 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) {
#if __i386__ || __x86_64__ || defined(_M_IX86) || defined(_M_X64)
// Intel processors have a unified instruction and data cache
// so there is nothing to do
#elif defined(_WIN32) && (defined(__arm__) || defined(__aarch64__))
FlushInstructionCache(GetCurrentProcess(), start, end - start);
#elif defined(__arm__) && !defined(__APPLE__)
#if defined(__FreeBSD__) || defined(__NetBSD__)
struct arm_sync_icache_args arg;
arg.addr = (uintptr_t)start;
arg.len = (uintptr_t)end - (uintptr_t)start;
sysarch(ARM_SYNC_ICACHE, &arg);
#elif defined(__linux__)
// We used to include asm/unistd.h for the __ARM_NR_cacheflush define, but
// it also brought many other unused defines, as well as a dependency on
// kernel headers to be installed.
//
// This value is stable at least since Linux 3.13 and should remain so for
// compatibility reasons, warranting it's re-definition here.
#define __ARM_NR_cacheflush 0x0f0002
register int start_reg __asm("r0") = (int)(intptr_t)start;
const register int end_reg __asm("r1") = (int)(intptr_t)end;
const register int flags __asm("r2") = 0;
const register int syscall_nr __asm("r7") = __ARM_NR_cacheflush;
__asm __volatile("svc 0x0"
: "=r"(start_reg)
: "r"(syscall_nr), "r"(start_reg), "r"(end_reg), "r"(flags));
assert(start_reg == 0 && "Cache flush syscall failed.");
#else
compilerrt_abort();
#endif
#elif defined(__linux__) && defined(__mips__)
const uintptr_t start_int = (uintptr_t)start;
const uintptr_t end_int = (uintptr_t)end;
syscall(__NR_cacheflush, start, (end_int - start_int), BCACHE);
#elif defined(__mips__) && defined(__OpenBSD__)
cacheflush(start, (uintptr_t)end - (uintptr_t)start, BCACHE);
#elif defined(__aarch64__) && !defined(__APPLE__)
uint64_t xstart = (uint64_t)(uintptr_t)start;
uint64_t xend = (uint64_t)(uintptr_t)end;
uint64_t addr;
// Get Cache Type Info
uint64_t ctr_el0;
__asm __volatile("mrs %0, ctr_el0" : "=r"(ctr_el0));
// dc & ic instructions must use 64bit registers so we don't use
// uintptr_t in case this runs in an IPL32 environment.
const size_t dcache_line_size = 4 << ((ctr_el0 >> 16) & 15);
for (addr = xstart & ~(dcache_line_size - 1); addr < xend;
addr += dcache_line_size)
__asm __volatile("dc cvau, %0" ::"r"(addr));
__asm __volatile("dsb ish");
const size_t icache_line_size = 4 << ((ctr_el0 >> 0) & 15);
for (addr = xstart & ~(icache_line_size - 1); addr < xend;
addr += icache_line_size)
__asm __volatile("ic ivau, %0" ::"r"(addr));
__asm __volatile("isb sy");
#elif defined(__powerpc64__)
const size_t line_size = 32;
const size_t len = (uintptr_t)end - (uintptr_t)start;
const uintptr_t mask = ~(line_size - 1);
const uintptr_t start_line = ((uintptr_t)start) & mask;
const uintptr_t end_line = ((uintptr_t)start + len + line_size - 1) & mask;
for (uintptr_t line = start_line; line < end_line; line += line_size)
__asm__ volatile("dcbf 0, %0" : : "r"(line));
__asm__ volatile("sync");
for (uintptr_t line = start_line; line < end_line; line += line_size)
__asm__ volatile("icbi 0, %0" : : "r"(line));
__asm__ volatile("isync");
#elif defined(__sparc__)
const size_t dword_size = 8;
const size_t len = (uintptr_t)end - (uintptr_t)start;
const uintptr_t mask = ~(dword_size - 1);
const uintptr_t start_dword = ((uintptr_t)start) & mask;
const uintptr_t end_dword = ((uintptr_t)start + len + dword_size - 1) & mask;
for (uintptr_t dword = start_dword; dword < end_dword; dword += dword_size)
__asm__ volatile("flush %0" : : "r"(dword));
#else
#if __APPLE__
// On Darwin, sys_icache_invalidate() provides this functionality
sys_icache_invalidate(start, end - start);
#else
compilerrt_abort();
#endif
#endif
}