| /* |
| * Copyright 2011, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "MemChunk.h" |
| |
| #include "utils/flush_cpu_cache.h" |
| #include "utils/helper.h" |
| |
| #include <llvm/Support/raw_ostream.h> |
| |
| #ifndef USE_MINGW /* TODO create a proper HAVE_MMAN_H */ |
| #include <sys/mman.h> |
| #else |
| #include "mmanWindows.h" |
| #endif |
| |
| #include <stdlib.h> |
| |
| #ifndef MAP_32BIT |
| #define MAP_32BIT 0 |
| // Note: If the <sys/mman.h> does not come with MAP_32BIT, then we |
| // define it as zero, so that it won't manipulate the flags. |
| #endif |
| |
| //#define USE_FIXED_ADDR_MEM_CHUNK 1 |
| |
| #if USE_FIXED_ADDR_MEM_CHUNK |
| static uintptr_t StartAddr = 0x7e000000UL; |
| #endif |
| |
| MemChunk::MemChunk() : buf((unsigned char *)MAP_FAILED), buf_size(0) { |
| } |
| |
| MemChunk::~MemChunk() { |
| if (buf != MAP_FAILED) { |
| munmap(buf, buf_size); |
| } |
| } |
| |
| bool MemChunk::allocate(size_t size) { |
| if (size == 0) { |
| return true; |
| } |
| #if USE_FIXED_ADDR_MEM_CHUNK |
| buf = (unsigned char *)mmap((void *)StartAddr, size, |
| PROT_READ | PROT_WRITE, |
| MAP_PRIVATE | MAP_ANON | MAP_32BIT, |
| -1, 0); |
| #else |
| buf = (unsigned char *)mmap(0, size, |
| PROT_READ | PROT_WRITE, |
| MAP_PRIVATE | MAP_ANON | MAP_32BIT, |
| -1, 0); |
| #endif |
| |
| if (buf == MAP_FAILED) { |
| return false; |
| } |
| |
| #if USE_FIXED_ADDR_MEM_CHUNK |
| StartAddr += (size + 4095) / 4096 * 4096; |
| #endif |
| |
| buf_size = size; |
| return true; |
| } |
| |
| void MemChunk::print() const { |
| if (buf != MAP_FAILED) { |
| dump_hex(buf, buf_size, 0, buf_size); |
| } |
| } |
| |
| bool MemChunk::protect(int prot) { |
| if (buf_size > 0) { |
| int ret = mprotect((void *)buf, buf_size, prot); |
| if (ret == -1) { |
| llvm::errs() << "Error: Can't mprotect.\n"; |
| return false; |
| } |
| |
| if (prot & PROT_EXEC) { |
| FLUSH_CPU_CACHE(buf, buf + buf_size); |
| } |
| } |
| |
| return true; |
| } |