| /* |
| * Copyright (C) 2015 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 "linker_mapped_file_fragment.h" |
| #include "linker_debug.h" |
| #include "linker_utils.h" |
| |
| #include <inttypes.h> |
| #include <stdlib.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| |
| MappedFileFragment::MappedFileFragment() : map_start_(nullptr), map_size_(0), |
| data_(nullptr), size_ (0) |
| { } |
| |
| MappedFileFragment::~MappedFileFragment() { |
| if (map_start_ != nullptr) { |
| munmap(map_start_, map_size_); |
| } |
| } |
| |
| bool MappedFileFragment::Map(int fd, off64_t base_offset, size_t elf_offset, size_t size) { |
| off64_t offset; |
| CHECK(safe_add(&offset, base_offset, elf_offset)); |
| |
| off64_t page_min = page_start(offset); |
| off64_t end_offset; |
| |
| CHECK(safe_add(&end_offset, offset, size)); |
| CHECK(safe_add(&end_offset, end_offset, page_offset(offset))); |
| |
| size_t map_size = static_cast<size_t>(end_offset - page_min); |
| CHECK(map_size >= size); |
| |
| uint8_t* map_start = static_cast<uint8_t*>( |
| mmap64(nullptr, map_size, PROT_READ, MAP_PRIVATE, fd, page_min)); |
| |
| if (map_start == MAP_FAILED) { |
| return false; |
| } |
| |
| map_start_ = map_start; |
| map_size_ = map_size; |
| |
| data_ = map_start + page_offset(offset); |
| size_ = size; |
| |
| return true; |
| } |