//===-- 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 #include #if __APPLE__ #include #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 #include // clang-format on #endif #if defined(__NetBSD__) && defined(__arm__) #include #endif #if defined(__OpenBSD__) && (defined(__arm__) || defined(__mips__)) // clang-format off #include #include // clang-format on #endif #if defined(__linux__) && defined(__mips__) #include #include #include #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__) || defined(__OpenBSD__) 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; // Get Cache Type Info. static uint64_t ctr_el0 = 0; if (ctr_el0 == 0) __asm __volatile("mrs %0, ctr_el0" : "=r"(ctr_el0)); // The DC and IC instructions must use 64-bit registers so we don't use // uintptr_t in case this runs in an IPL32 environment. uint64_t addr; // If CTR_EL0.IDC is set, data cache cleaning to the point of unification // is not required for instruction to data coherence. if (((ctr_el0 >> 28) & 0x1) == 0x0) { 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"); // If CTR_EL0.DIC is set, instruction cache invalidation to the point of // unification is not required for instruction to data coherence. if (((ctr_el0 >> 29) & 0x1) == 0x0) { 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)); #elif defined(__riscv) && defined(__linux__) #define __NR_riscv_flush_icache (244 + 15) register void *start_reg __asm("a0") = start; const register void *end_reg __asm("a1") = end; const register long flags __asm("a2") = 0; const register long syscall_nr __asm("a7") = __NR_riscv_flush_icache; __asm __volatile("ecall" : "=r"(start_reg) : "r"(start_reg), "r"(end_reg), "r"(flags), "r"(syscall_nr)); assert(start_reg == 0 && "Cache flush syscall failed."); #else #if __APPLE__ // On Darwin, sys_icache_invalidate() provides this functionality sys_icache_invalidate(start, end - start); #else compilerrt_abort(); #endif #endif }