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/* ===-- clear_cache.c - Implement __clear_cache ---------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#if __APPLE__
#include <libkern/OSCacheControl.h>
#endif
#if defined(__NetBSD__) && defined(__arm__)
#include <machine/sysarch.h>
#endif
#if defined(__ANDROID__) && defined(__mips__)
#include <sys/cachectl.h>
#endif
#if defined(__ANDROID__) && defined(__arm__)
#include <asm/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__
/*
* Intel processors have a unified instruction and data cache
* so there is nothing to do
*/
#elif defined(__arm__) && !defined(__APPLE__)
#if 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(__ANDROID__)
const 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) : "r0");
if (start_reg != 0) {
compilerrt_abort();
}
#else
compilerrt_abort();
#endif
#elif defined(__ANDROID__) && defined(__mips__)
const uintptr_t start_int = (uintptr_t) start;
const uintptr_t end_int = (uintptr_t) end;
_flush_cache(start, (end_int - start_int), BCACHE);
#elif defined(__aarch64__) && !defined(__APPLE__)
uint64_t xstart = (uint64_t)(uintptr_t) start;
uint64_t xend = (uint64_t)(uintptr_t) end;
// 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 (uint64_t addr = xstart; 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 (uint64_t addr = xstart; addr < xend; addr += icache_line_size)
__asm __volatile("ic ivau, %0" :: "r"(addr));
__asm __volatile("isb sy");
#else
#if __APPLE__
/* On Darwin, sys_icache_invalidate() provides this functionality */
sys_icache_invalidate(start, end-start);
#else
compilerrt_abort();
#endif
#endif
}
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