84bab5a955
Also adds unit-tests for page_start, page_offset, and safe_add Change-Id: Ia1325b4682d367328a01599a19848e4ffcd2c0ea
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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