mem_map.cc revision e58991b3b2282b5761f1a6023a16c803e1c4eb45
127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom/* 227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * Copyright (C) 2008 The Android Open Source Project 327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * 427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * Licensed under the Apache License, Version 2.0 (the "License"); 527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * you may not use this file except in compliance with the License. 627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * You may obtain a copy of the License at 727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * 827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * http://www.apache.org/licenses/LICENSE-2.0 927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * 1027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * Unless required by applicable law or agreed to in writing, software 1127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * distributed under the License is distributed on an "AS IS" BASIS, 1227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * See the License for the specific language governing permissions and 1427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom * limitations under the License. 1527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom */ 1627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 1727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom#include "mem_map.h" 1827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 191e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov#include "base/memory_tool.h" 20943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris#include <backtrace/BacktraceMap.h> 21c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include <inttypes.h> 220389cd57de8faedb85b749656b8e1735a7bce002Josh Gao#include <stdlib.h> 23c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers 24700a402244a1a423da4f3ba8032459f4b65fa18fIan Rogers#include <memory> 25c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include <sstream> 26e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes 27e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes#include "base/stringprintf.h" 28277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe 29277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic push 30277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic ignored "-Wshadow" 316c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "ScopedFd.h" 32277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic pop 33277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe 34c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include "thread-inl.h" 356c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "utils.h" 366c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 376c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#define USE_ASHMEM 1 386c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 396c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 406c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include <cutils/ashmem.h> 41997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#ifndef ANDROID_OS 42997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#include <sys/resource.h> 43997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#endif 446c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 456c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 46d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#ifndef MAP_ANONYMOUS 47d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#define MAP_ANONYMOUS MAP_ANON 48d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#endif 49d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers 5027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstromnamespace art { 5127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 52943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferrisstatic std::ostream& operator<<( 53943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris std::ostream& os, 54943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris std::pair<BacktraceMap::const_iterator, BacktraceMap::const_iterator> iters) { 55943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris for (BacktraceMap::const_iterator it = iters.first; it != iters.second; ++it) { 56943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris os << StringPrintf("0x%08x-0x%08x %c%c%c %s\n", 57943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris static_cast<uint32_t>(it->start), 58943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris static_cast<uint32_t>(it->end), 59943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_READ) ? 'r' : '-', 60943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_WRITE) ? 'w' : '-', 61943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_EXEC) ? 'x' : '-', it->name.c_str()); 62ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes } 63ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes return os; 6496970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes} 6596970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 66bad0267eaab9d6a522d05469ff90501deefdb88bMathieu Chartierstd::ostream& operator<<(std::ostream& os, const MemMap::Maps& mem_maps) { 673eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << "MemMap:" << std::endl; 683eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi for (auto it = mem_maps.begin(); it != mem_maps.end(); ++it) { 693eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi void* base = it->first; 703eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = it->second; 713eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK_EQ(base, map->BaseBegin()); 723eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << *map << std::endl; 733eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 743eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return os; 753eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 763eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 776e88ef6b604a7a945a466784580c42e6554c1289Mathieu ChartierMemMap::Maps* MemMap::maps_ = nullptr; 783eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 79c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if USE_ART_LOW_4G_ALLOCATOR 80d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Handling mem_map in 32b address range for 64b architectures that do not support MAP_32BIT. 81d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 82d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// The regular start of memory allocations. The first 64KB is protected by SELinux. 836bd621aa31aa94ed42a2a35256d219630bf0b687Andreas Gampestatic constexpr uintptr_t LOW_MEM_START = 64 * KB; 847104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 85d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Generate random starting position. 86d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// To not interfere with image position, take the image's address and only place it below. Current 87d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// formula (sketch): 88d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// 89d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ART_BASE_ADDR = 0001XXXXXXXXXXXXXXX 90d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ---------------------------------------- 91d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// = 0000111111111111111 92d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// & ~(kPageSize - 1) =~0000000000000001111 93d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ---------------------------------------- 94d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// mask = 0000111111111110000 95d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// & random data = YYYYYYYYYYYYYYYYYYY 96d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ----------------------------------- 97d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// tmp = 0000YYYYYYYYYYY0000 98d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// + LOW_MEM_START = 0000000000001000000 99d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// -------------------------------------- 100d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// start 101d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// 1020389cd57de8faedb85b749656b8e1735a7bce002Josh Gao// arc4random as an entropy source is exposed in Bionic, but not in glibc. When we 103d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// do not have Bionic, simply start with LOW_MEM_START. 104d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 105d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Function is standalone so it can be tested somewhat in mem_map_test.cc. 106d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#ifdef __BIONIC__ 107d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampeuintptr_t CreateStartPos(uint64_t input) { 108d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe CHECK_NE(0, ART_BASE_ADDRESS); 109d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 110d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Start with all bits below highest bit in ART_BASE_ADDRESS. 111d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr size_t leading_zeros = CLZ(static_cast<uint32_t>(ART_BASE_ADDRESS)); 112d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr uintptr_t mask_ones = (1 << (31 - leading_zeros)) - 1; 113d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 114d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Lowest (usually 12) bits are not used, as aligned by page size. 115d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr uintptr_t mask = mask_ones & ~(kPageSize - 1); 116d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 117d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Mask input data. 118d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe return (input & mask) + LOW_MEM_START; 119d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe} 120d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#endif 121d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 122d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampestatic uintptr_t GenerateNextMemPos() { 123d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#ifdef __BIONIC__ 1240389cd57de8faedb85b749656b8e1735a7bce002Josh Gao uint64_t random_data; 1250389cd57de8faedb85b749656b8e1735a7bce002Josh Gao arc4random_buf(&random_data, sizeof(random_data)); 1260389cd57de8faedb85b749656b8e1735a7bce002Josh Gao return CreateStartPos(random_data); 127d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#else 1280389cd57de8faedb85b749656b8e1735a7bce002Josh Gao // No arc4random on host, see above. 129d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe return LOW_MEM_START; 130d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#endif 131d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe} 132d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 133d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Initialize linear scan to random position. 134d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampeuintptr_t MemMap::next_mem_pos_ = GenerateNextMemPos(); 1358dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#endif 1368dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 137a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// Return true if the address range is contained in a single /proc/self/map entry. 138e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartierbool MemMap::ContainedWithinExistingMap(uint8_t* ptr, size_t size, std::string* error_msg) { 1395c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko uintptr_t begin = reinterpret_cast<uintptr_t>(ptr); 1405c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko uintptr_t end = begin + size; 141e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier 142e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier { 143e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 144e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier for (auto& pair : *MemMap::maps_) { 145e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier MemMap* const map = pair.second; 146e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier if (begin >= reinterpret_cast<uintptr_t>(map->Begin()) && 147e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier end <= reinterpret_cast<uintptr_t>(map->End())) { 148e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier return true; 149e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier } 150e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier } 151e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier } 152e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier 153a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid(), true)); 154836572a07142627ff291d686a4e9e03a0988344bChristopher Ferris if (map.get() == nullptr) { 155a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Failed to build process map"); 156a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 157a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 158a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) { 159a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if ((begin >= it->start && begin < it->end) // start of new within old 160a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo && (end > it->start && end <= it->end)) { // end of new within old 161a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return true; 162a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 163a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 164b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko PrintFileToLog("/proc/self/maps", LogSeverity::ERROR); 165a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Requested region 0x%08" PRIxPTR "-0x%08" PRIxPTR " does not overlap " 166a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "any existing map. See process maps in the log.", begin, end); 167a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 168a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo} 169a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 170a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// Return true if the address range does not conflict with any /proc/self/maps entry. 171a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guostatic bool CheckNonOverlapping(uintptr_t begin, 172a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t end, 173a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::string* error_msg) { 174a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid(), true)); 175836572a07142627ff291d686a4e9e03a0988344bChristopher Ferris if (map.get() == nullptr) { 176a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Failed to build process map"); 177a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 178a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 179a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) { 180a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if ((begin >= it->start && begin < it->end) // start of new within old 181a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo || (end > it->start && end < it->end) // end of new within old 182a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo || (begin <= it->start && end > it->end)) { // start/end of new includes all of old 183a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::ostringstream map_info; 184a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo map_info << std::make_pair(it, map->end()); 185a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Requested region 0x%08" PRIxPTR "-0x%08" PRIxPTR " overlaps with " 186a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo "existing map 0x%08" PRIxPTR "-0x%08" PRIxPTR " (%s)\n%s", 187a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo begin, end, 188a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo static_cast<uintptr_t>(it->start), static_cast<uintptr_t>(it->end), 189a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo it->name.c_str(), 190a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo map_info.str().c_str()); 191a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 192a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 193a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 194a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return true; 195a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo} 196a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 197a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// CheckMapRequest to validate a non-MAP_FAILED mmap result based on 198a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// the expected value, calling munmap if validation fails, giving the 199a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// reason in error_msg. 200a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// 2012cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier// If the expected_ptr is null, nothing is checked beyond the fact 202a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// that the actual_ptr is not MAP_FAILED. However, if expected_ptr is 203a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// non-null, we check that pointer is the actual_ptr == expected_ptr, 204a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// and if not, report in error_msg what the conflict mapping was if 205a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// found, or a generic error in other cases. 20613735955f39b3b304c37d2b2840663c131262c18Ian Rogersstatic bool CheckMapRequest(uint8_t* expected_ptr, void* actual_ptr, size_t byte_count, 207a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::string* error_msg) { 2084fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // Handled first by caller for more specific error messages. 2094fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(actual_ptr != MAP_FAILED); 2104fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 2114fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (expected_ptr == nullptr) { 2124fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return true; 2134fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 2144fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 215a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t actual = reinterpret_cast<uintptr_t>(actual_ptr); 216a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t expected = reinterpret_cast<uintptr_t>(expected_ptr); 217a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t limit = expected + byte_count; 218a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 2194fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (expected_ptr == actual_ptr) { 2204fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return true; 2214fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 2224fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 2234fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // We asked for an address but didn't get what we wanted, all paths below here should fail. 2244fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi int result = munmap(actual_ptr, byte_count); 2254fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (result == -1) { 2264fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi PLOG(WARNING) << StringPrintf("munmap(%p, %zd) failed", actual_ptr, byte_count); 22727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 228ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes 229b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // We call this here so that we can try and generate a full error 230b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // message with the overlapping mapping. There's no guarantee that 231b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // that there will be an overlap though, since 2321d8199d8215a6ee7b1904edc47372d83fcdee5a3Kenny Root // - The kernel is not *required* to honor expected_ptr unless MAP_FIXED is 233b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // true, even if there is no overlap 234b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // - There might have been an overlap at the point of mmap, but the 235b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // overlapping region has since been unmapped. 236b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath std::string error_detail; 237b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath CheckNonOverlapping(expected, limit, &error_detail); 238b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 239b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath std::ostringstream os; 240b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath os << StringPrintf("Failed to mmap at expected address, mapped at " 241b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath "0x%08" PRIxPTR " instead of 0x%08" PRIxPTR, 242b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath actual, expected); 243b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath if (!error_detail.empty()) { 244b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath os << " : " << error_detail; 245943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris } 246a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 247b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath *error_msg = os.str(); 2484fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return false; 24927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 25027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 25138c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier#if USE_ART_LOW_4G_ALLOCATOR 25238c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartierstatic inline void* TryMemMapLow4GB(void* ptr, size_t page_aligned_byte_count, int prot, int flags, 25338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier int fd) { 25438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier void* actual = mmap(ptr, page_aligned_byte_count, prot, flags, fd, 0); 25538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (actual != MAP_FAILED) { 25638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // Since we didn't use MAP_FIXED the kernel may have mapped it somewhere not in the low 25738c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // 4GB. If this is the case, unmap and retry. 25838c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (reinterpret_cast<uintptr_t>(actual) + page_aligned_byte_count >= 4 * GB) { 25938c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier munmap(actual, page_aligned_byte_count); 26038c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = MAP_FAILED; 26138c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 26238c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 26338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier return actual; 26438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier} 26538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier#endif 26638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier 26713735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap* MemMap::MapAnonymous(const char* name, uint8_t* expected_ptr, size_t byte_count, int prot, 2685c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko bool low_4gb, bool reuse, std::string* error_msg) { 2696a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers#ifndef __LP64__ 2706a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers UNUSED(low_4gb); 2716a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers#endif 2729004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 273a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(name, nullptr, 0, nullptr, 0, prot, false); 2749004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 275ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 2766c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 277997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers int flags = MAP_PRIVATE | MAP_ANONYMOUS; 2785c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko if (reuse) { 2795c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko // reuse means it is okay that it overlaps an existing page mapping. 2805c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko // Only use this if you actually made the page reservation yourself. 2815c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko CHECK(expected_ptr != nullptr); 2825c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko 283b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko DCHECK(ContainedWithinExistingMap(expected_ptr, byte_count, error_msg)) << *error_msg; 2845c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko flags |= MAP_FIXED; 2855c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko } 2865c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko 287997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers ScopedFd fd(-1); 288997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers 2896c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 290c60e1b755c5632dfeb04c333489ede52ee5c945fAndreas Gampe#ifdef __ANDROID__ 291997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers const bool use_ashmem = true; 2926c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#else 293997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // When not on Android ashmem is faked using files in /tmp. Ensure that such files won't 294997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // fail due to ulimit restrictions. If they will then use a regular mmap. 295997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers struct rlimit rlimit_fsize; 296997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers CHECK_EQ(getrlimit(RLIMIT_FSIZE, &rlimit_fsize), 0); 297997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers const bool use_ashmem = (rlimit_fsize.rlim_cur == RLIM_INFINITY) || 298997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers (page_aligned_byte_count < rlimit_fsize.rlim_cur); 299997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#endif 300997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers if (use_ashmem) { 301997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // android_os_Debug.cpp read_mapinfo assumes all ashmem regions associated with the VM are 302997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // prefixed "dalvik-". 303997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers std::string debug_friendly_name("dalvik-"); 304997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers debug_friendly_name += name; 305997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers fd.reset(ashmem_create_region(debug_friendly_name.c_str(), page_aligned_byte_count)); 306997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers if (fd.get() == -1) { 307997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers *error_msg = StringPrintf("ashmem_create_region failed for '%s': %s", name, strerror(errno)); 308997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers return nullptr; 309997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers } 3105c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko flags &= ~MAP_ANONYMOUS; 311997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers } 3126c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 3138dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 314aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom // We need to store and potentially set an error number for pretty printing of errors 315aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom int saved_errno = 0; 316aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 31784d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi#ifdef __LP64__ 31884d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // When requesting low_4g memory and having an expectation, the requested range should fit into 31984d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // 4GB. 32084d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi if (low_4gb && ( 32184d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // Start out of bounds. 322a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo (reinterpret_cast<uintptr_t>(expected_ptr) >> 32) != 0 || 32384d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // End out of bounds. For simplicity, this will fail for the last page of memory. 324a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo (reinterpret_cast<uintptr_t>(expected_ptr + page_aligned_byte_count) >> 32) != 0)) { 32584d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi *error_msg = StringPrintf("The requested address space (%p, %p) cannot fit in low_4gb", 326a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo expected_ptr, expected_ptr + page_aligned_byte_count); 32784d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi return nullptr; 32884d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi } 32984d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi#endif 33084d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi 3318dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // TODO: 3328dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // A page allocator would be a useful abstraction here, as 3338dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // 1) It is doubtful that MAP_32BIT on x86_64 is doing the right job for us 3348dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // 2) The linear scheme, even with simple saving of the last known position, is very crude 335c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if USE_ART_LOW_4G_ALLOCATOR 3368dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // MAP_32BIT only available on x86_64. 3378dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith void* actual = MAP_FAILED; 338a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (low_4gb && expected_ptr == nullptr) { 3397104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe bool first_run = true; 3407104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 3417889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 34271a3ebabb2a6b4921071d115aa176d8222aeb803Andreas Gampe for (uintptr_t ptr = next_mem_pos_; ptr < 4 * GB; ptr += kPageSize) { 3437889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Use maps_ as an optimization to skip over large maps. 3447889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Find the first map which is address > ptr. 3457889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier auto it = maps_->upper_bound(reinterpret_cast<void*>(ptr)); 3467889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier if (it != maps_->begin()) { 3477889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier auto before_it = it; 3487889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier --before_it; 3497889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Start at the end of the map before the upper bound. 3507889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ptr = std::max(ptr, reinterpret_cast<uintptr_t>(before_it->second->BaseEnd())); 3517889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier CHECK_ALIGNED(ptr, kPageSize); 3527889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3537889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier while (it != maps_->end()) { 3547889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // How much space do we have until the next map? 3557889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier size_t delta = reinterpret_cast<uintptr_t>(it->first) - ptr; 3567889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // If the space may be sufficient, break out of the loop. 3577889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier if (delta >= page_aligned_byte_count) { 3587889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier break; 3597889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3607889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Otherwise, skip to the end of the map. 3617889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ptr = reinterpret_cast<uintptr_t>(it->second->BaseEnd()); 3627889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier CHECK_ALIGNED(ptr, kPageSize); 3637889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ++it; 3647889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3657889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier 36638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // Try to see if we get lucky with this address since none of the ART maps overlap. 36738c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = TryMemMapLow4GB(reinterpret_cast<void*>(ptr), page_aligned_byte_count, prot, flags, 36838c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier fd.get()); 36938c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (actual != MAP_FAILED) { 37038c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier next_mem_pos_ = reinterpret_cast<uintptr_t>(actual) + page_aligned_byte_count; 37138c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier break; 37238c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 37338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier 3747104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe if (4U * GB - ptr < page_aligned_byte_count) { 3757104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Not enough memory until 4GB. 3767104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe if (first_run) { 3777104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Try another time from the bottom; 3789de65ff3a9c49b91d80be292020f012f3d0a24efAndreas Gampe ptr = LOW_MEM_START - kPageSize; 3797104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe first_run = false; 3807104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe continue; 3817104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } else { 3827104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Second try failed. 3837104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe break; 3847104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } 3857104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } 3867104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 3878dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith uintptr_t tail_ptr; 3888dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 3898dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // Check pages are free. 3908dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith bool safe = true; 3918dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith for (tail_ptr = ptr; tail_ptr < ptr + page_aligned_byte_count; tail_ptr += kPageSize) { 3928dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (msync(reinterpret_cast<void*>(tail_ptr), kPageSize, 0) == 0) { 3938dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith safe = false; 3948dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith break; 3958dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 3968dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith DCHECK_EQ(errno, ENOMEM); 3978dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 3988dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 3998dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4008dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith next_mem_pos_ = tail_ptr; // update early, as we break out when we found and mapped a region 4018dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4028dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (safe == true) { 40338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = TryMemMapLow4GB(reinterpret_cast<void*>(ptr), page_aligned_byte_count, prot, flags, 40438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier fd.get()); 4058dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (actual != MAP_FAILED) { 406c355a2a78d6ebdfdb645221275affb9136b4c667Mathieu Chartier break; 4078dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4088dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 4098dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // Skip over last page. 4108dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith ptr = tail_ptr; 4118dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4128dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4138dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4148dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (actual == MAP_FAILED) { 415aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom LOG(ERROR) << "Could not find contiguous low-memory space."; 416aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = ENOMEM; 4178dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4188dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 419a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo actual = mmap(expected_ptr, page_aligned_byte_count, prot, flags, fd.get(), 0); 420aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = errno; 4218dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4228dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4238dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#else 424c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if defined(__LP64__) 425a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (low_4gb && expected_ptr == nullptr) { 426ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers flags |= MAP_32BIT; 427ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers } 428ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers#endif 4294fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 430a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo void* actual = mmap(expected_ptr, page_aligned_byte_count, prot, flags, fd.get(), 0); 431aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = errno; 4328dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#endif 4338dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 43427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 435a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 436aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 437a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("Failed anonymous mmap(%p, %zd, 0x%x, 0x%x, %d, 0): %s. See process " 438a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "maps in the log.", expected_ptr, page_aligned_byte_count, prot, 439a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe flags, fd.get(), strerror(saved_errno)); 4404fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 4414fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 4424fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi std::ostringstream check_map_request_error_msg; 443a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!CheckMapRequest(expected_ptr, actual, page_aligned_byte_count, error_msg)) { 4448d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers return nullptr; 44527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 44613735955f39b3b304c37d2b2840663c131262c18Ian Rogers return new MemMap(name, reinterpret_cast<uint8_t*>(actual), byte_count, actual, 44701d4b5072c064d927260486c891a09fe689289c0Mathieu Chartier page_aligned_byte_count, prot, reuse); 44827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 44927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 4501baabf0726eb285284e0c908ccba9f209b399faeDavid SrbeckyMemMap* MemMap::MapDummy(const char* name, uint8_t* addr, size_t byte_count) { 4511baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky if (byte_count == 0) { 4521baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky return new MemMap(name, nullptr, 0, nullptr, 0, 0, false); 4531baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky } 4541baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky const size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 4551baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky return new MemMap(name, addr, byte_count, addr, page_aligned_byte_count, 0, true /* reuse */); 4561baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky} 4571baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky 4582cebb24bfc3247d3e9be138a3350106737455918Mathieu ChartierMemMap* MemMap::MapFileAtAddress(uint8_t* expected_ptr, size_t byte_count, int prot, int flags, 4592cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier int fd, off_t start, bool reuse, const char* filename, 4608d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string* error_msg) { 46127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 46227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, flags & (MAP_SHARED | MAP_PRIVATE)); 463b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 464b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // Note that we do not allow MAP_FIXED unless reuse == true, i.e we 465b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // expect his mapping to be contained within an existing map. 4664fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (reuse) { 4674fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // reuse means it is okay that it overlaps an existing page mapping. 4684fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // Only use this if you actually made the page reservation yourself. 469a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo CHECK(expected_ptr != nullptr); 470b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 471b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko DCHECK(ContainedWithinExistingMap(expected_ptr, byte_count, error_msg)) << *error_msg; 4724fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi flags |= MAP_FIXED; 4734fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } else { 4744fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK_EQ(0, flags & MAP_FIXED); 475b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // Don't bother checking for an overlapping region here. We'll 476b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // check this if required after the fact inside CheckMapRequest. 4774fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 4784fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 4799004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 480a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(filename, nullptr, 0, nullptr, 0, prot, false); 4819004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 482f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'offset' to be page-aligned as required by mmap. 48327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom int page_offset = start % kPageSize; 48427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom off_t page_aligned_offset = start - page_offset; 485f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'byte_count' to be page-aligned as we will map this anyway. 486ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count + page_offset, kPageSize); 487a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // The 'expected_ptr' is modified (if specified, ie non-null) to be page aligned to the file but 488a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // not necessarily to virtual memory. mmap will page align 'expected' for us. 4892cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier uint8_t* page_aligned_expected = 4902cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier (expected_ptr == nullptr) ? nullptr : (expected_ptr - page_offset); 4914fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 4921e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov size_t redzone_size = 0; 4931e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov if (RUNNING_ON_MEMORY_TOOL && kMemoryToolAddsRedzones && expected_ptr == nullptr) { 4941e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov redzone_size = kPageSize; 4951e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov page_aligned_byte_count += redzone_size; 4961e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov } 4971e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 49813735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* actual = reinterpret_cast<uint8_t*>(mmap(page_aligned_expected, 499ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes page_aligned_byte_count, 50027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom prot, 50127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom flags, 50227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom fd, 50327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom page_aligned_offset)); 50427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 505aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom auto saved_errno = errno; 506aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 507a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 508aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 509c7cb1901b776129044a4ad3886fd6450e83df681Mathieu Chartier *error_msg = StringPrintf("mmap(%p, %zd, 0x%x, 0x%x, %d, %" PRId64 510a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe ") of file '%s' failed: %s. See process maps in the log.", 5114fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi page_aligned_expected, page_aligned_byte_count, prot, flags, fd, 512aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom static_cast<int64_t>(page_aligned_offset), filename, 513a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe strerror(saved_errno)); 5144fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 5154fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 5164fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi std::ostringstream check_map_request_error_msg; 517a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!CheckMapRequest(expected_ptr, actual, page_aligned_byte_count, error_msg)) { 5184fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 51927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 5201e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov if (redzone_size != 0) { 5211e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov const uint8_t *real_start = actual + page_offset; 5221e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov const uint8_t *real_end = actual + page_offset + byte_count; 5231e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov const uint8_t *mapping_end = actual + page_aligned_byte_count; 5241e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 5251e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_NOACCESS(actual, real_start - actual); 5261e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_NOACCESS(real_end, mapping_end - real_end); 5271e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov page_aligned_byte_count -= redzone_size; 5281e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov } 5291e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 5300d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return new MemMap(filename, actual + page_offset, byte_count, actual, page_aligned_byte_count, 5311e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov prot, reuse, redzone_size); 53227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 53327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 53427ec961a1da540ba7f16c07a682585ab167317adBrian CarlstromMemMap::~MemMap() { 5354fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (base_begin_ == nullptr && base_size_ == 0) { 53627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 53727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 5381e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 5391e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov // Unlike Valgrind, AddressSanitizer requires that all manually poisoned memory is unpoisoned 5401e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov // before it is returned to the system. 5411e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov if (redzone_size_ != 0) { 5421e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_UNDEFINED( 5431e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov reinterpret_cast<char*>(base_begin_) + base_size_ - redzone_size_, 5441e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov redzone_size_); 5451e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov } 5461e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 547a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!reuse_) { 5481e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_UNDEFINED(base_begin_, base_size_); 549a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo int result = munmap(base_begin_, base_size_); 550a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (result == -1) { 551a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo PLOG(FATAL) << "munmap failed"; 552a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 55327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 5543eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 5553eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Remove it from maps_. 5563eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 5573eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi bool found = false; 5586e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 5596e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(base_begin_), end = maps_->end(); 5603eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == base_begin_; ++it) { 5613eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (it->second == this) { 5623eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi found = true; 5636e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_->erase(it); 5643eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi break; 5653eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 5663eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 5673eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(found) << "MemMap not found"; 56827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 56927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 57013735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap::MemMap(const std::string& name, uint8_t* begin, size_t size, void* base_begin, 5711e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov size_t base_size, int prot, bool reuse, size_t redzone_size) 5721c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier : name_(name), begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size), 5731e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov prot_(prot), reuse_(reuse), redzone_size_(redzone_size) { 5749004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (size_ == 0) { 5754fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(begin_ == nullptr); 5764fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(base_begin_ == nullptr); 5779004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_EQ(base_size_, 0U); 5789004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } else { 5794fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(begin_ != nullptr); 5804fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(base_begin_ != nullptr); 5819004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_NE(base_size_, 0U); 5823eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 5833eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Add it to maps_. 5843eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 5856e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 5866e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_->insert(std::make_pair(base_begin_, this)); 5879004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 588c8ccf68b805c92674545f63e0341ba47e8d9701cAndreas Gampe} 58927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 59013735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap* MemMap::RemapAtEnd(uint8_t* new_end, const char* tail_name, int tail_prot, 591fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi std::string* error_msg) { 592cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_GE(new_end, Begin()); 593cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_LE(new_end, End()); 59413735955f39b3b304c37d2b2840663c131262c18Ian Rogers DCHECK_LE(begin_ + size_, reinterpret_cast<uint8_t*>(base_begin_) + base_size_); 59514d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(begin_, kPageSize); 59614d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(base_begin_, kPageSize); 59714d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(reinterpret_cast<uint8_t*>(base_begin_) + base_size_, kPageSize); 59814d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(new_end, kPageSize); 59913735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* old_end = begin_ + size_; 60013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* old_base_end = reinterpret_cast<uint8_t*>(base_begin_) + base_size_; 60113735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* new_base_end = new_end; 602fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK_LE(new_base_end, old_base_end); 603fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (new_base_end == old_base_end) { 604a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(tail_name, nullptr, 0, nullptr, 0, tail_prot, false); 605fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 60613735955f39b3b304c37d2b2840663c131262c18Ian Rogers size_ = new_end - reinterpret_cast<uint8_t*>(begin_); 60713735955f39b3b304c37d2b2840663c131262c18Ian Rogers base_size_ = new_base_end - reinterpret_cast<uint8_t*>(base_begin_); 60813735955f39b3b304c37d2b2840663c131262c18Ian Rogers DCHECK_LE(begin_ + size_, reinterpret_cast<uint8_t*>(base_begin_) + base_size_); 609fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi size_t tail_size = old_end - new_end; 61013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* tail_base_begin = new_base_end; 611fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi size_t tail_base_size = old_base_end - new_base_end; 612fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK_EQ(tail_base_begin + tail_base_size, old_base_end); 61314d90579f013b374638b599361970557ed4b3f09Roland Levillain DCHECK_ALIGNED(tail_base_size, kPageSize); 614fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi 615fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#ifdef USE_ASHMEM 616fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // android_os_Debug.cpp read_mapinfo assumes all ashmem regions associated with the VM are 617fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // prefixed "dalvik-". 618fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi std::string debug_friendly_name("dalvik-"); 619fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi debug_friendly_name += tail_name; 620fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi ScopedFd fd(ashmem_create_region(debug_friendly_name.c_str(), tail_base_size)); 6218dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith int flags = MAP_PRIVATE | MAP_FIXED; 622fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (fd.get() == -1) { 623fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi *error_msg = StringPrintf("ashmem_create_region failed for '%s': %s", 624fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi tail_name, strerror(errno)); 625fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 626fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 627fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#else 628fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi ScopedFd fd(-1); 629fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi int flags = MAP_PRIVATE | MAP_ANONYMOUS; 630fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#endif 631fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi 6321e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 6331e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_UNDEFINED(tail_base_begin, tail_base_size); 634fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // Unmap/map the tail region. 635fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi int result = munmap(tail_base_begin, tail_base_size); 636fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (result == -1) { 637a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 638a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("munmap(%p, %zd) failed for '%s'. See process maps in the log.", 639a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe tail_base_begin, tail_base_size, name_.c_str()); 640fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 641fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 642fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // Don't cause memory allocation between the munmap and the mmap 643fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // calls. Otherwise, libc (or something else) might take this memory 644fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // region. Note this isn't perfect as there's no way to prevent 645fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // other threads to try to take this memory region here. 64613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* actual = reinterpret_cast<uint8_t*>(mmap(tail_base_begin, tail_base_size, tail_prot, 647fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi flags, fd.get(), 0)); 648fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (actual == MAP_FAILED) { 649a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 650a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("anonymous mmap(%p, %zd, 0x%x, 0x%x, %d, 0) failed. See process " 651a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "maps in the log.", tail_base_begin, tail_base_size, tail_prot, flags, 652a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe fd.get()); 653fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 654fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 655a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(tail_name, actual, tail_size, actual, tail_base_size, tail_prot, false); 656cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier} 657d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 658c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogersvoid MemMap::MadviseDontNeedAndZero() { 659c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (base_begin_ != nullptr || base_size_ != 0) { 660c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (!kMadviseZeroes) { 661c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers memset(base_begin_, 0, base_size_); 662c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 663c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers int result = madvise(base_begin_, base_size_, MADV_DONTNEED); 664c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (result == -1) { 665c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers PLOG(WARNING) << "madvise failed"; 666c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 667c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 668c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers} 669c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers 670d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chienbool MemMap::Protect(int prot) { 6714fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (base_begin_ == nullptr && base_size_ == 0) { 6721c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 673d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 674d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 675d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 676d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (mprotect(base_begin_, base_size_, prot) == 0) { 6771c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 678d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 679d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 680d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 681a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao PLOG(ERROR) << "mprotect(" << reinterpret_cast<void*>(base_begin_) << ", " << base_size_ << ", " 682a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao << prot << ") failed"; 683d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return false; 684d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien} 685d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 6863eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchibool MemMap::CheckNoGaps(MemMap* begin_map, MemMap* end_map) { 6873eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 6883eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(begin_map != nullptr); 6893eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(end_map != nullptr); 6903eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(HasMemMap(begin_map)); 6913eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(HasMemMap(end_map)); 6923eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK_LE(begin_map->BaseBegin(), end_map->BaseBegin()); 6933eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = begin_map; 6943eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi while (map->BaseBegin() != end_map->BaseBegin()) { 6953eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* next_map = GetLargestMemMapAt(map->BaseEnd()); 6963eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (next_map == nullptr) { 6973eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Found a gap. 6983eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return false; 6993eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7003eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi map = next_map; 7013eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7023eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return true; 7033eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7043eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 70517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Markovoid MemMap::DumpMaps(std::ostream& os, bool terse) { 7063eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 70717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko DumpMapsLocked(os, terse); 7083eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7093eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 71017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Markovoid MemMap::DumpMapsLocked(std::ostream& os, bool terse) { 71117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko const auto& mem_maps = *maps_; 71217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (!terse) { 71317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << mem_maps; 71417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko return; 71517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 71617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko 71717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // Terse output example: 71817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // [MemMap: 0x409be000+0x20P~0x11dP+0x20P~0x61cP+0x20P prot=0x3 LinearAlloc] 71917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // [MemMap: 0x451d6000+0x6bP(3) prot=0x3 large object space allocation] 72017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // The details: 72117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "+0x20P" means 0x20 pages taken by a single mapping, 72217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "~0x11dP" means a gap of 0x11d pages, 72317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "+0x6bP(3)" means 3 mappings one after another, together taking 0x6b pages. 72417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "MemMap:" << std::endl; 72517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko for (auto it = mem_maps.begin(), maps_end = mem_maps.end(); it != maps_end;) { 72617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap* map = it->second; 72717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko void* base = it->first; 72817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko CHECK_EQ(base, map->BaseBegin()); 72917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "[MemMap: " << base; 73017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++it; 73117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // Merge consecutive maps with the same protect flags and name. 73217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko constexpr size_t kMaxGaps = 9; 73317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t num_gaps = 0; 73417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t num = 1u; 73517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t size = map->BaseSize(); 73614d90579f013b374638b599361970557ed4b3f09Roland Levillain CHECK_ALIGNED(size, kPageSize); 73717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko void* end = map->BaseEnd(); 73817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko while (it != maps_end && 73917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko it->second->GetProtect() == map->GetProtect() && 74017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko it->second->GetName() == map->GetName() && 74117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko (it->second->BaseBegin() == end || num_gaps < kMaxGaps)) { 74217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (it->second->BaseBegin() != end) { 74317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++num_gaps; 74417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "+0x" << std::hex << (size / kPageSize) << "P"; 74517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (num != 1u) { 74617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "(" << std::dec << num << ")"; 74717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 74817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t gap = 74917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko reinterpret_cast<uintptr_t>(it->second->BaseBegin()) - reinterpret_cast<uintptr_t>(end); 75014d90579f013b374638b599361970557ed4b3f09Roland Levillain CHECK_ALIGNED(gap, kPageSize); 75117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "~0x" << std::hex << (gap / kPageSize) << "P"; 75217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko num = 0u; 75317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size = 0u; 75417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 75514d90579f013b374638b599361970557ed4b3f09Roland Levillain CHECK_ALIGNED(it->second->BaseSize(), kPageSize); 75617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++num; 75717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size += it->second->BaseSize(); 75817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko end = it->second->BaseEnd(); 75917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++it; 76017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 76117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "+0x" << std::hex << (size / kPageSize) << "P"; 76217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (num != 1u) { 76317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "(" << std::dec << num << ")"; 76417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 76517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << " prot=0x" << std::hex << map->GetProtect() << " " << map->GetName() << "]" << std::endl; 76617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 7673eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7683eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7693eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchibool MemMap::HasMemMap(MemMap* map) { 7703eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi void* base_begin = map->BaseBegin(); 7716e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(base_begin), end = maps_->end(); 7723eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == base_begin; ++it) { 7733eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (it->second == map) { 7743eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return true; 7753eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7763eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7773eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return false; 7783eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7793eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7803eed93dd5be03e5539827bebf0f414251a12e15eHiroshi YamauchiMemMap* MemMap::GetLargestMemMapAt(void* address) { 7813eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi size_t largest_size = 0; 7823eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* largest_map = nullptr; 7836e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 7846e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(address), end = maps_->end(); 7853eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == address; ++it) { 7863eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = it->second; 7873eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(map != nullptr); 7883eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (largest_size < map->BaseSize()) { 7893eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi largest_size = map->BaseSize(); 7903eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi largest_map = map; 7913eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7923eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7933eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return largest_map; 7943eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7953eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7966e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartiervoid MemMap::Init() { 7976e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 7986e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier if (maps_ == nullptr) { 7996e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier // dex2oat calls MemMap::Init twice since its needed before the runtime is created. 8006e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_ = new Maps; 8016e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier } 8026e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier} 8036e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier 8046e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartiervoid MemMap::Shutdown() { 8056e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 8066e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier delete maps_; 8076e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_ = nullptr; 8086e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier} 8096e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier 810379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartiervoid MemMap::SetSize(size_t new_size) { 811379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier if (new_size == base_size_) { 812379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier return; 813379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier } 814379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_ALIGNED(new_size, kPageSize); 815379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_EQ(base_size_, size_) << "Unsupported"; 816379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_LE(new_size, base_size_); 8171e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov MEMORY_TOOL_MAKE_UNDEFINED( 8181e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(BaseBegin()) + 8191e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov new_size), 8201e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov base_size_ - new_size); 821379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_EQ(munmap(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(BaseBegin()) + new_size), 822379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier base_size_ - new_size), 0) << new_size << " " << base_size_; 823379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier base_size_ = new_size; 824379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier size_ = new_size; 825379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier} 826379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier 8270d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstromstd::ostream& operator<<(std::ostream& os, const MemMap& mem_map) { 8283eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << StringPrintf("[MemMap: %p-%p prot=0x%x %s]", 8293eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi mem_map.BaseBegin(), mem_map.BaseEnd(), mem_map.GetProtect(), 8303eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi mem_map.GetName().c_str()); 8310d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return os; 8320d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom} 8330d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 83427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} // namespace art 835