76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "linker_mapped_file_fragment.h"
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#include "linker_debug.h"
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#include "linker_utils.h"
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#include <inttypes.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <unistd.h>
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MappedFileFragment::MappedFileFragment() : map_start_(nullptr), map_size_(0),
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data_(nullptr), size_ (0)
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{ }
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MappedFileFragment::~MappedFileFragment() {
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if (map_start_ != nullptr) {
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munmap(map_start_, map_size_);
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}
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}
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bool MappedFileFragment::Map(int fd, off64_t base_offset, size_t elf_offset, size_t size) {
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off64_t offset;
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CHECK(safe_add(&offset, base_offset, elf_offset));
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off64_t page_min = page_start(offset);
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off64_t end_offset;
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CHECK(safe_add(&end_offset, offset, size));
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CHECK(safe_add(&end_offset, end_offset, page_offset(offset)));
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size_t map_size = static_cast<size_t>(end_offset - page_min);
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CHECK(map_size >= size);
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uint8_t* map_start = static_cast<uint8_t*>(
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mmap64(nullptr, map_size, PROT_READ, MAP_PRIVATE, fd, page_min));
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if (map_start == MAP_FAILED) {
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return false;
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}
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map_start_ = map_start;
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map_size_ = map_size;
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data_ = map_start + page_offset(offset);
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size_ = size;
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return true;
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}
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