1*8d67ca89SAndroid Build Coastguard Worker /*
2*8d67ca89SAndroid Build Coastguard Worker * Copyright (C) 2015 The Android Open Source Project
3*8d67ca89SAndroid Build Coastguard Worker * All rights reserved.
4*8d67ca89SAndroid Build Coastguard Worker *
5*8d67ca89SAndroid Build Coastguard Worker * Redistribution and use in source and binary forms, with or without
6*8d67ca89SAndroid Build Coastguard Worker * modification, are permitted provided that the following conditions
7*8d67ca89SAndroid Build Coastguard Worker * are met:
8*8d67ca89SAndroid Build Coastguard Worker * * Redistributions of source code must retain the above copyright
9*8d67ca89SAndroid Build Coastguard Worker * notice, this list of conditions and the following disclaimer.
10*8d67ca89SAndroid Build Coastguard Worker * * Redistributions in binary form must reproduce the above copyright
11*8d67ca89SAndroid Build Coastguard Worker * notice, this list of conditions and the following disclaimer in
12*8d67ca89SAndroid Build Coastguard Worker * the documentation and/or other materials provided with the
13*8d67ca89SAndroid Build Coastguard Worker * distribution.
14*8d67ca89SAndroid Build Coastguard Worker *
15*8d67ca89SAndroid Build Coastguard Worker * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16*8d67ca89SAndroid Build Coastguard Worker * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17*8d67ca89SAndroid Build Coastguard Worker * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18*8d67ca89SAndroid Build Coastguard Worker * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19*8d67ca89SAndroid Build Coastguard Worker * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20*8d67ca89SAndroid Build Coastguard Worker * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21*8d67ca89SAndroid Build Coastguard Worker * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22*8d67ca89SAndroid Build Coastguard Worker * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23*8d67ca89SAndroid Build Coastguard Worker * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24*8d67ca89SAndroid Build Coastguard Worker * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25*8d67ca89SAndroid Build Coastguard Worker * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26*8d67ca89SAndroid Build Coastguard Worker * SUCH DAMAGE.
27*8d67ca89SAndroid Build Coastguard Worker */
28*8d67ca89SAndroid Build Coastguard Worker
29*8d67ca89SAndroid Build Coastguard Worker #include "linker_mapped_file_fragment.h"
30*8d67ca89SAndroid Build Coastguard Worker #include "linker_debug.h"
31*8d67ca89SAndroid Build Coastguard Worker #include "linker_utils.h"
32*8d67ca89SAndroid Build Coastguard Worker #include "platform/bionic/page.h"
33*8d67ca89SAndroid Build Coastguard Worker
34*8d67ca89SAndroid Build Coastguard Worker #include <inttypes.h>
35*8d67ca89SAndroid Build Coastguard Worker #include <stdlib.h>
36*8d67ca89SAndroid Build Coastguard Worker #include <sys/mman.h>
37*8d67ca89SAndroid Build Coastguard Worker #include <unistd.h>
38*8d67ca89SAndroid Build Coastguard Worker
MappedFileFragment()39*8d67ca89SAndroid Build Coastguard Worker MappedFileFragment::MappedFileFragment() : map_start_(nullptr), map_size_(0),
40*8d67ca89SAndroid Build Coastguard Worker data_(nullptr), size_ (0)
41*8d67ca89SAndroid Build Coastguard Worker { }
42*8d67ca89SAndroid Build Coastguard Worker
~MappedFileFragment()43*8d67ca89SAndroid Build Coastguard Worker MappedFileFragment::~MappedFileFragment() {
44*8d67ca89SAndroid Build Coastguard Worker if (map_start_ != nullptr) {
45*8d67ca89SAndroid Build Coastguard Worker munmap(map_start_, map_size_);
46*8d67ca89SAndroid Build Coastguard Worker }
47*8d67ca89SAndroid Build Coastguard Worker }
48*8d67ca89SAndroid Build Coastguard Worker
Map(int fd,off64_t base_offset,size_t elf_offset,size_t size)49*8d67ca89SAndroid Build Coastguard Worker bool MappedFileFragment::Map(int fd, off64_t base_offset, size_t elf_offset, size_t size) {
50*8d67ca89SAndroid Build Coastguard Worker off64_t offset;
51*8d67ca89SAndroid Build Coastguard Worker CHECK(safe_add(&offset, base_offset, elf_offset));
52*8d67ca89SAndroid Build Coastguard Worker
53*8d67ca89SAndroid Build Coastguard Worker off64_t page_min = page_start(offset);
54*8d67ca89SAndroid Build Coastguard Worker off64_t end_offset;
55*8d67ca89SAndroid Build Coastguard Worker
56*8d67ca89SAndroid Build Coastguard Worker CHECK(safe_add(&end_offset, offset, size));
57*8d67ca89SAndroid Build Coastguard Worker CHECK(safe_add(&end_offset, end_offset, page_offset(offset)));
58*8d67ca89SAndroid Build Coastguard Worker
59*8d67ca89SAndroid Build Coastguard Worker size_t map_size = static_cast<size_t>(end_offset - page_min);
60*8d67ca89SAndroid Build Coastguard Worker CHECK(map_size >= size);
61*8d67ca89SAndroid Build Coastguard Worker
62*8d67ca89SAndroid Build Coastguard Worker uint8_t* map_start = static_cast<uint8_t*>(
63*8d67ca89SAndroid Build Coastguard Worker mmap64(nullptr, map_size, PROT_READ, MAP_PRIVATE, fd, page_min));
64*8d67ca89SAndroid Build Coastguard Worker
65*8d67ca89SAndroid Build Coastguard Worker if (map_start == MAP_FAILED) {
66*8d67ca89SAndroid Build Coastguard Worker return false;
67*8d67ca89SAndroid Build Coastguard Worker }
68*8d67ca89SAndroid Build Coastguard Worker
69*8d67ca89SAndroid Build Coastguard Worker map_start_ = map_start;
70*8d67ca89SAndroid Build Coastguard Worker map_size_ = map_size;
71*8d67ca89SAndroid Build Coastguard Worker
72*8d67ca89SAndroid Build Coastguard Worker data_ = map_start + page_offset(offset);
73*8d67ca89SAndroid Build Coastguard Worker size_ = size;
74*8d67ca89SAndroid Build Coastguard Worker
75*8d67ca89SAndroid Build Coastguard Worker return true;
76*8d67ca89SAndroid Build Coastguard Worker }
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