mem_map.cc revision 01d4b5072c064d927260486c891a09fe689289c0
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 19943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris#include <backtrace/BacktraceMap.h> 20c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include <inttypes.h> 21c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers 22700a402244a1a423da4f3ba8032459f4b65fa18fIan Rogers#include <memory> 23c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include <sstream> 24e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes 25d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// See CreateStartPos below. 26d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#ifdef __BIONIC__ 27d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#include <sys/auxv.h> 28d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#endif 29d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 30e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes#include "base/stringprintf.h" 31277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe 32277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic push 33277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic ignored "-Wshadow" 346c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "ScopedFd.h" 35277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe#pragma GCC diagnostic pop 36277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe 37c7dd295a4e0cc1d15c0c96088e55a85389bade74Ian Rogers#include "thread-inl.h" 386c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "utils.h" 396c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 406c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#define USE_ASHMEM 1 416c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 426c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 436c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include <cutils/ashmem.h> 44997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#ifndef ANDROID_OS 45997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#include <sys/resource.h> 46997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#endif 476c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 486c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 49d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#ifndef MAP_ANONYMOUS 50d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#define MAP_ANONYMOUS MAP_ANON 51d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers#endif 52d6b6865cf787be8e4548e018762e72c7d1a40e52Ian Rogers 5327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstromnamespace art { 5427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 55943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferrisstatic std::ostream& operator<<( 56943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris std::ostream& os, 57943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris std::pair<BacktraceMap::const_iterator, BacktraceMap::const_iterator> iters) { 58943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris for (BacktraceMap::const_iterator it = iters.first; it != iters.second; ++it) { 59943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris os << StringPrintf("0x%08x-0x%08x %c%c%c %s\n", 60943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris static_cast<uint32_t>(it->start), 61943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris static_cast<uint32_t>(it->end), 62943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_READ) ? 'r' : '-', 63943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_WRITE) ? 'w' : '-', 64943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris (it->flags & PROT_EXEC) ? 'x' : '-', it->name.c_str()); 65ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes } 66ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes return os; 6796970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes} 6896970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 69bad0267eaab9d6a522d05469ff90501deefdb88bMathieu Chartierstd::ostream& operator<<(std::ostream& os, const MemMap::Maps& mem_maps) { 703eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << "MemMap:" << std::endl; 713eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi for (auto it = mem_maps.begin(); it != mem_maps.end(); ++it) { 723eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi void* base = it->first; 733eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = it->second; 743eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK_EQ(base, map->BaseBegin()); 753eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << *map << std::endl; 763eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 773eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return os; 783eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 793eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 806e88ef6b604a7a945a466784580c42e6554c1289Mathieu ChartierMemMap::Maps* MemMap::maps_ = nullptr; 813eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 82c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if USE_ART_LOW_4G_ALLOCATOR 83d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Handling mem_map in 32b address range for 64b architectures that do not support MAP_32BIT. 84d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 85d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// The regular start of memory allocations. The first 64KB is protected by SELinux. 866bd621aa31aa94ed42a2a35256d219630bf0b687Andreas Gampestatic constexpr uintptr_t LOW_MEM_START = 64 * KB; 877104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 88d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Generate random starting position. 89d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// To not interfere with image position, take the image's address and only place it below. Current 90d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// formula (sketch): 91d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// 92d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ART_BASE_ADDR = 0001XXXXXXXXXXXXXXX 93d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ---------------------------------------- 94d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// = 0000111111111111111 95d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// & ~(kPageSize - 1) =~0000000000000001111 96d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ---------------------------------------- 97d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// mask = 0000111111111110000 98d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// & random data = YYYYYYYYYYYYYYYYYYY 99d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// ----------------------------------- 100d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// tmp = 0000YYYYYYYYYYY0000 101d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// + LOW_MEM_START = 0000000000001000000 102d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// -------------------------------------- 103d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// start 104d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// 105d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// getauxval as an entropy source is exposed in Bionic, but not in glibc before 2.16. When we 106d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// do not have Bionic, simply start with LOW_MEM_START. 107d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 108d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Function is standalone so it can be tested somewhat in mem_map_test.cc. 109d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#ifdef __BIONIC__ 110d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampeuintptr_t CreateStartPos(uint64_t input) { 111d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe CHECK_NE(0, ART_BASE_ADDRESS); 112d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 113d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Start with all bits below highest bit in ART_BASE_ADDRESS. 114d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr size_t leading_zeros = CLZ(static_cast<uint32_t>(ART_BASE_ADDRESS)); 115d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr uintptr_t mask_ones = (1 << (31 - leading_zeros)) - 1; 116d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 117d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Lowest (usually 12) bits are not used, as aligned by page size. 118d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe constexpr uintptr_t mask = mask_ones & ~(kPageSize - 1); 119d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 120d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // Mask input data. 121d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe return (input & mask) + LOW_MEM_START; 122d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe} 123d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#endif 124d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 125d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampestatic uintptr_t GenerateNextMemPos() { 126d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#ifdef __BIONIC__ 127d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe uint8_t* random_data = reinterpret_cast<uint8_t*>(getauxval(AT_RANDOM)); 128d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // The lower 8B are taken for the stack guard. Use the upper 8B (with mask). 129d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe return CreateStartPos(*reinterpret_cast<uintptr_t*>(random_data + 8)); 130d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#else 131d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe // No auxv on host, see above. 132d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe return LOW_MEM_START; 133d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe#endif 134d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe} 135d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe 136d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Initialize linear scan to random position. 137d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampeuintptr_t MemMap::next_mem_pos_ = GenerateNextMemPos(); 1388dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#endif 1398dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 140a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// Return true if the address range is contained in a single /proc/self/map entry. 1415c42c29b89286e5efa4a4613132b09051ce5945bVladimir Markostatic bool ContainedWithinExistingMap(uint8_t* ptr, size_t size, 142b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath std::string* error_msg) { 1435c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko uintptr_t begin = reinterpret_cast<uintptr_t>(ptr); 1445c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko uintptr_t end = begin + size; 145a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid(), true)); 146836572a07142627ff291d686a4e9e03a0988344bChristopher Ferris if (map.get() == nullptr) { 147a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Failed to build process map"); 148a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 149a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 150a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) { 151a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if ((begin >= it->start && begin < it->end) // start of new within old 152a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo && (end > it->start && end <= it->end)) { // end of new within old 153a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return true; 154a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 155a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 156b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko PrintFileToLog("/proc/self/maps", LogSeverity::ERROR); 157a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Requested region 0x%08" PRIxPTR "-0x%08" PRIxPTR " does not overlap " 158a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "any existing map. See process maps in the log.", begin, end); 159a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 160a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo} 161a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 162a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// Return true if the address range does not conflict with any /proc/self/maps entry. 163a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guostatic bool CheckNonOverlapping(uintptr_t begin, 164a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t end, 165a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::string* error_msg) { 166a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid(), true)); 167836572a07142627ff291d686a4e9e03a0988344bChristopher Ferris if (map.get() == nullptr) { 168a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Failed to build process map"); 169a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 170a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 171a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) { 172a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if ((begin >= it->start && begin < it->end) // start of new within old 173a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo || (end > it->start && end < it->end) // end of new within old 174a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo || (begin <= it->start && end > it->end)) { // start/end of new includes all of old 175a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::ostringstream map_info; 176a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo map_info << std::make_pair(it, map->end()); 177a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo *error_msg = StringPrintf("Requested region 0x%08" PRIxPTR "-0x%08" PRIxPTR " overlaps with " 178a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo "existing map 0x%08" PRIxPTR "-0x%08" PRIxPTR " (%s)\n%s", 179a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo begin, end, 180a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo static_cast<uintptr_t>(it->start), static_cast<uintptr_t>(it->end), 181a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo it->name.c_str(), 182a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo map_info.str().c_str()); 183a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return false; 184a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 185a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 186a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return true; 187a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo} 188a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 189a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// CheckMapRequest to validate a non-MAP_FAILED mmap result based on 190a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// the expected value, calling munmap if validation fails, giving the 191a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// reason in error_msg. 192a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// 1932cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier// If the expected_ptr is null, nothing is checked beyond the fact 194a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// that the actual_ptr is not MAP_FAILED. However, if expected_ptr is 195a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// non-null, we check that pointer is the actual_ptr == expected_ptr, 196a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// and if not, report in error_msg what the conflict mapping was if 197a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo// found, or a generic error in other cases. 19813735955f39b3b304c37d2b2840663c131262c18Ian Rogersstatic bool CheckMapRequest(uint8_t* expected_ptr, void* actual_ptr, size_t byte_count, 199a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo std::string* error_msg) { 2004fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // Handled first by caller for more specific error messages. 2014fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(actual_ptr != MAP_FAILED); 2024fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 2034fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (expected_ptr == nullptr) { 2044fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return true; 2054fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 2064fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 207a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t actual = reinterpret_cast<uintptr_t>(actual_ptr); 208a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t expected = reinterpret_cast<uintptr_t>(expected_ptr); 209a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo uintptr_t limit = expected + byte_count; 210a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 2114fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (expected_ptr == actual_ptr) { 2124fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return true; 2134fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 2144fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 2154fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // We asked for an address but didn't get what we wanted, all paths below here should fail. 2164fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi int result = munmap(actual_ptr, byte_count); 2174fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (result == -1) { 2184fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi PLOG(WARNING) << StringPrintf("munmap(%p, %zd) failed", actual_ptr, byte_count); 21927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 220ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes 221b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // We call this here so that we can try and generate a full error 222b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // message with the overlapping mapping. There's no guarantee that 223b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // that there will be an overlap though, since 2241d8199d8215a6ee7b1904edc47372d83fcdee5a3Kenny Root // - The kernel is not *required* to honor expected_ptr unless MAP_FIXED is 225b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // true, even if there is no overlap 226b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // - There might have been an overlap at the point of mmap, but the 227b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // overlapping region has since been unmapped. 228b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath std::string error_detail; 229b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath CheckNonOverlapping(expected, limit, &error_detail); 230b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 231b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath std::ostringstream os; 232b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath os << StringPrintf("Failed to mmap at expected address, mapped at " 233b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath "0x%08" PRIxPTR " instead of 0x%08" PRIxPTR, 234b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath actual, expected); 235b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath if (!error_detail.empty()) { 236b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath os << " : " << error_detail; 237943af7dab1454517c5bd11a31ab99f260afb22d1Christopher Ferris } 238a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 239b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath *error_msg = os.str(); 2404fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return false; 24127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 24227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 24338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier#if USE_ART_LOW_4G_ALLOCATOR 24438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartierstatic inline void* TryMemMapLow4GB(void* ptr, size_t page_aligned_byte_count, int prot, int flags, 24538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier int fd) { 24638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier void* actual = mmap(ptr, page_aligned_byte_count, prot, flags, fd, 0); 24738c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (actual != MAP_FAILED) { 24838c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // Since we didn't use MAP_FIXED the kernel may have mapped it somewhere not in the low 24938c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // 4GB. If this is the case, unmap and retry. 25038c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (reinterpret_cast<uintptr_t>(actual) + page_aligned_byte_count >= 4 * GB) { 25138c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier munmap(actual, page_aligned_byte_count); 25238c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = MAP_FAILED; 25338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 25438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 25538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier return actual; 25638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier} 25738c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier#endif 25838c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier 25913735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap* MemMap::MapAnonymous(const char* name, uint8_t* expected_ptr, size_t byte_count, int prot, 2605c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko bool low_4gb, bool reuse, std::string* error_msg) { 2616a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers#ifndef __LP64__ 2626a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers UNUSED(low_4gb); 2636a3c1fcb4ba42ad4d5d142c17a3712a6ddd3866fIan Rogers#endif 2649004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 265a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(name, nullptr, 0, nullptr, 0, prot, false); 2669004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 267ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 2686c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 269997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers int flags = MAP_PRIVATE | MAP_ANONYMOUS; 2705c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko if (reuse) { 2715c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko // reuse means it is okay that it overlaps an existing page mapping. 2725c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko // Only use this if you actually made the page reservation yourself. 2735c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko CHECK(expected_ptr != nullptr); 2745c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko 275b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko DCHECK(ContainedWithinExistingMap(expected_ptr, byte_count, error_msg)) << *error_msg; 2765c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko flags |= MAP_FIXED; 2775c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko } 2785c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko 279997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers ScopedFd fd(-1); 280997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers 2816c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 282997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#ifdef HAVE_ANDROID_OS 283997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers const bool use_ashmem = true; 2846c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#else 285997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // When not on Android ashmem is faked using files in /tmp. Ensure that such files won't 286997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // fail due to ulimit restrictions. If they will then use a regular mmap. 287997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers struct rlimit rlimit_fsize; 288997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers CHECK_EQ(getrlimit(RLIMIT_FSIZE, &rlimit_fsize), 0); 289997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers const bool use_ashmem = (rlimit_fsize.rlim_cur == RLIM_INFINITY) || 290997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers (page_aligned_byte_count < rlimit_fsize.rlim_cur); 291997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers#endif 292997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers if (use_ashmem) { 293997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // android_os_Debug.cpp read_mapinfo assumes all ashmem regions associated with the VM are 294997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers // prefixed "dalvik-". 295997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers std::string debug_friendly_name("dalvik-"); 296997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers debug_friendly_name += name; 297997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers fd.reset(ashmem_create_region(debug_friendly_name.c_str(), page_aligned_byte_count)); 298997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers if (fd.get() == -1) { 299997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers *error_msg = StringPrintf("ashmem_create_region failed for '%s': %s", name, strerror(errno)); 300997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers return nullptr; 301997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers } 3025c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko flags &= ~MAP_ANONYMOUS; 303997f0f9e69ce7aee73cebd64be8dc40af9164257Ian Rogers } 3046c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 3058dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 306aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom // We need to store and potentially set an error number for pretty printing of errors 307aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom int saved_errno = 0; 308aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 30984d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi#ifdef __LP64__ 31084d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // When requesting low_4g memory and having an expectation, the requested range should fit into 31184d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // 4GB. 31284d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi if (low_4gb && ( 31384d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // Start out of bounds. 314a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo (reinterpret_cast<uintptr_t>(expected_ptr) >> 32) != 0 || 31584d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi // End out of bounds. For simplicity, this will fail for the last page of memory. 316a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo (reinterpret_cast<uintptr_t>(expected_ptr + page_aligned_byte_count) >> 32) != 0)) { 31784d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi *error_msg = StringPrintf("The requested address space (%p, %p) cannot fit in low_4gb", 318a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo expected_ptr, expected_ptr + page_aligned_byte_count); 31984d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi return nullptr; 32084d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi } 32184d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi#endif 32284d49ccd79088eb9a9f423c0a96e3905468cfe7dQiming Shi 3238dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // TODO: 3248dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // A page allocator would be a useful abstraction here, as 3258dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // 1) It is doubtful that MAP_32BIT on x86_64 is doing the right job for us 3268dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // 2) The linear scheme, even with simple saving of the last known position, is very crude 327c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if USE_ART_LOW_4G_ALLOCATOR 3288dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // MAP_32BIT only available on x86_64. 3298dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith void* actual = MAP_FAILED; 330a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (low_4gb && expected_ptr == nullptr) { 3317104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe bool first_run = true; 3327104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 3337889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 33471a3ebabb2a6b4921071d115aa176d8222aeb803Andreas Gampe for (uintptr_t ptr = next_mem_pos_; ptr < 4 * GB; ptr += kPageSize) { 3357889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Use maps_ as an optimization to skip over large maps. 3367889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Find the first map which is address > ptr. 3377889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier auto it = maps_->upper_bound(reinterpret_cast<void*>(ptr)); 3387889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier if (it != maps_->begin()) { 3397889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier auto before_it = it; 3407889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier --before_it; 3417889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Start at the end of the map before the upper bound. 3427889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ptr = std::max(ptr, reinterpret_cast<uintptr_t>(before_it->second->BaseEnd())); 3437889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier CHECK_ALIGNED(ptr, kPageSize); 3447889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3457889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier while (it != maps_->end()) { 3467889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // How much space do we have until the next map? 3477889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier size_t delta = reinterpret_cast<uintptr_t>(it->first) - ptr; 3487889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // If the space may be sufficient, break out of the loop. 3497889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier if (delta >= page_aligned_byte_count) { 3507889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier break; 3517889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3527889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier // Otherwise, skip to the end of the map. 3537889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ptr = reinterpret_cast<uintptr_t>(it->second->BaseEnd()); 3547889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier CHECK_ALIGNED(ptr, kPageSize); 3557889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier ++it; 3567889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier } 3577889a77e464b820745c9507ccd484f68e7b1c650Mathieu Chartier 35838c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier // Try to see if we get lucky with this address since none of the ART maps overlap. 35938c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = TryMemMapLow4GB(reinterpret_cast<void*>(ptr), page_aligned_byte_count, prot, flags, 36038c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier fd.get()); 36138c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier if (actual != MAP_FAILED) { 36238c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier next_mem_pos_ = reinterpret_cast<uintptr_t>(actual) + page_aligned_byte_count; 36338c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier break; 36438c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier } 36538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier 3667104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe if (4U * GB - ptr < page_aligned_byte_count) { 3677104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Not enough memory until 4GB. 3687104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe if (first_run) { 3697104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Try another time from the bottom; 3709de65ff3a9c49b91d80be292020f012f3d0a24efAndreas Gampe ptr = LOW_MEM_START - kPageSize; 3717104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe first_run = false; 3727104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe continue; 3737104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } else { 3747104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe // Second try failed. 3757104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe break; 3767104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } 3777104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe } 3787104cbf9c594563c6daae592b8f38f49a423d12eAndreas Gampe 3798dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith uintptr_t tail_ptr; 3808dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 3818dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // Check pages are free. 3828dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith bool safe = true; 3838dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith for (tail_ptr = ptr; tail_ptr < ptr + page_aligned_byte_count; tail_ptr += kPageSize) { 3848dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (msync(reinterpret_cast<void*>(tail_ptr), kPageSize, 0) == 0) { 3858dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith safe = false; 3868dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith break; 3878dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 3888dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith DCHECK_EQ(errno, ENOMEM); 3898dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 3908dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 3918dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 3928dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith next_mem_pos_ = tail_ptr; // update early, as we break out when we found and mapped a region 3938dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 3948dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (safe == true) { 39538c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier actual = TryMemMapLow4GB(reinterpret_cast<void*>(ptr), page_aligned_byte_count, prot, flags, 39638c8221b8f8bd0411006c44d3126f78eb6a8e9abMathieu Chartier fd.get()); 3978dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (actual != MAP_FAILED) { 398c355a2a78d6ebdfdb645221275affb9136b4c667Mathieu Chartier break; 3998dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4008dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 4018dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith // Skip over last page. 4028dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith ptr = tail_ptr; 4038dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4048dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4058dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4068dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith if (actual == MAP_FAILED) { 407aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom LOG(ERROR) << "Could not find contiguous low-memory space."; 408aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = ENOMEM; 4098dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4108dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } else { 411a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo actual = mmap(expected_ptr, page_aligned_byte_count, prot, flags, fd.get(), 0); 412aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = errno; 4138dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith } 4148dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 4158dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#else 416c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if defined(__LP64__) 417a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (low_4gb && expected_ptr == nullptr) { 418ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers flags |= MAP_32BIT; 419ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers } 420ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers#endif 4214fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 422a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo void* actual = mmap(expected_ptr, page_aligned_byte_count, prot, flags, fd.get(), 0); 423aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom saved_errno = errno; 4248dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#endif 4258dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 42627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 427a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 428aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 429a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("Failed anonymous mmap(%p, %zd, 0x%x, 0x%x, %d, 0): %s. See process " 430a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "maps in the log.", expected_ptr, page_aligned_byte_count, prot, 431a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe flags, fd.get(), strerror(saved_errno)); 4324fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 4334fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 4344fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi std::ostringstream check_map_request_error_msg; 435a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!CheckMapRequest(expected_ptr, actual, page_aligned_byte_count, error_msg)) { 4368d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers return nullptr; 43727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 43813735955f39b3b304c37d2b2840663c131262c18Ian Rogers return new MemMap(name, reinterpret_cast<uint8_t*>(actual), byte_count, actual, 43901d4b5072c064d927260486c891a09fe689289c0Mathieu Chartier page_aligned_byte_count, prot, reuse); 44027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 44127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 44249e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid SrbeckyMemMap* MemMap::MapDummy(const char* name, uint8_t* addr, size_t byte_count) { 44349e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky if (byte_count == 0) { 44449e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky return new MemMap(name, nullptr, 0, nullptr, 0, 0, false); 44549e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky } 44649e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky const size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 44749e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky return new MemMap(name, addr, byte_count, addr, page_aligned_byte_count, 0, true /* reuse */); 44849e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky} 44949e1fabc85480f01077f3cc10e8ba6ada6e4befaDavid Srbecky 4502cebb24bfc3247d3e9be138a3350106737455918Mathieu ChartierMemMap* MemMap::MapFileAtAddress(uint8_t* expected_ptr, size_t byte_count, int prot, int flags, 4512cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier int fd, off_t start, bool reuse, const char* filename, 4528d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string* error_msg) { 45327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 45427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, flags & (MAP_SHARED | MAP_PRIVATE)); 455b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 456b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // Note that we do not allow MAP_FIXED unless reuse == true, i.e we 457b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // expect his mapping to be contained within an existing map. 4584fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (reuse) { 4594fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // reuse means it is okay that it overlaps an existing page mapping. 4604fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi // Only use this if you actually made the page reservation yourself. 461a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo CHECK(expected_ptr != nullptr); 462b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath 463b5505823ad3d0bab8fc9c15c266a3d8cd96ee59eVladimir Marko DCHECK(ContainedWithinExistingMap(expected_ptr, byte_count, error_msg)) << *error_msg; 4644fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi flags |= MAP_FIXED; 4654fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } else { 4664fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK_EQ(0, flags & MAP_FIXED); 467b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // Don't bother checking for an overlapping region here. We'll 468b89c3da592de1a2741a08cc3c8ed2908e8bdd15aNarayan Kamath // check this if required after the fact inside CheckMapRequest. 4694fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 4704fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 4719004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 472a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(filename, nullptr, 0, nullptr, 0, prot, false); 4739004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 474f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'offset' to be page-aligned as required by mmap. 47527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom int page_offset = start % kPageSize; 47627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom off_t page_aligned_offset = start - page_offset; 477f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'byte_count' to be page-aligned as we will map this anyway. 478ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count + page_offset, kPageSize); 479a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // The 'expected_ptr' is modified (if specified, ie non-null) to be page aligned to the file but 480a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // not necessarily to virtual memory. mmap will page align 'expected' for us. 4812cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier uint8_t* page_aligned_expected = 4822cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier (expected_ptr == nullptr) ? nullptr : (expected_ptr - page_offset); 4834fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi 48413735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* actual = reinterpret_cast<uint8_t*>(mmap(page_aligned_expected, 485ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes page_aligned_byte_count, 48627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom prot, 48727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom flags, 48827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom fd, 48927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom page_aligned_offset)); 49027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 491aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom auto saved_errno = errno; 492aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 493a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 494aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom 495c7cb1901b776129044a4ad3886fd6450e83df681Mathieu Chartier *error_msg = StringPrintf("mmap(%p, %zd, 0x%x, 0x%x, %d, %" PRId64 496a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe ") of file '%s' failed: %s. See process maps in the log.", 4974fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi page_aligned_expected, page_aligned_byte_count, prot, flags, fd, 498aa94cf3e77035bf204a21d0341d8f8513a19885cBrian Carlstrom static_cast<int64_t>(page_aligned_offset), filename, 499a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe strerror(saved_errno)); 5004fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 5014fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi } 5024fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi std::ostringstream check_map_request_error_msg; 503a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!CheckMapRequest(expected_ptr, actual, page_aligned_byte_count, error_msg)) { 5044fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi return nullptr; 50527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 5060d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return new MemMap(filename, actual + page_offset, byte_count, actual, page_aligned_byte_count, 507a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo prot, reuse); 50827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 50927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 51027ec961a1da540ba7f16c07a682585ab167317adBrian CarlstromMemMap::~MemMap() { 5114fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (base_begin_ == nullptr && base_size_ == 0) { 51227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 51327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 514a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (!reuse_) { 515a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo int result = munmap(base_begin_, base_size_); 516a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo if (result == -1) { 517a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo PLOG(FATAL) << "munmap failed"; 518a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo } 51927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 5203eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 5213eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Remove it from maps_. 5223eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 5233eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi bool found = false; 5246e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 5256e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(base_begin_), end = maps_->end(); 5263eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == base_begin_; ++it) { 5273eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (it->second == this) { 5283eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi found = true; 5296e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_->erase(it); 5303eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi break; 5313eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 5323eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 5333eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(found) << "MemMap not found"; 53427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 53527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 53613735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap::MemMap(const std::string& name, uint8_t* begin, size_t size, void* base_begin, 537a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo size_t base_size, int prot, bool reuse) 5381c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier : name_(name), begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size), 539a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo prot_(prot), reuse_(reuse) { 5409004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (size_ == 0) { 5414fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(begin_ == nullptr); 5424fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(base_begin_ == nullptr); 5439004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_EQ(base_size_, 0U); 5449004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } else { 5454fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(begin_ != nullptr); 5464fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi CHECK(base_begin_ != nullptr); 5479004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_NE(base_size_, 0U); 5483eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 5493eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Add it to maps_. 5503eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 5516e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 5526e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_->insert(std::make_pair(base_begin_, this)); 5539004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 554c8ccf68b805c92674545f63e0341ba47e8d9701cAndreas Gampe} 55527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 55613735955f39b3b304c37d2b2840663c131262c18Ian RogersMemMap* MemMap::RemapAtEnd(uint8_t* new_end, const char* tail_name, int tail_prot, 557fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi std::string* error_msg) { 558cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_GE(new_end, Begin()); 559cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_LE(new_end, End()); 56013735955f39b3b304c37d2b2840663c131262c18Ian Rogers DCHECK_LE(begin_ + size_, reinterpret_cast<uint8_t*>(base_begin_) + base_size_); 561fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK(IsAligned<kPageSize>(begin_)); 562fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK(IsAligned<kPageSize>(base_begin_)); 56313735955f39b3b304c37d2b2840663c131262c18Ian Rogers DCHECK(IsAligned<kPageSize>(reinterpret_cast<uint8_t*>(base_begin_) + base_size_)); 564fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK(IsAligned<kPageSize>(new_end)); 56513735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* old_end = begin_ + size_; 56613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* old_base_end = reinterpret_cast<uint8_t*>(base_begin_) + base_size_; 56713735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* new_base_end = new_end; 568fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK_LE(new_base_end, old_base_end); 569fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (new_base_end == old_base_end) { 570a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(tail_name, nullptr, 0, nullptr, 0, tail_prot, false); 571fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 57213735955f39b3b304c37d2b2840663c131262c18Ian Rogers size_ = new_end - reinterpret_cast<uint8_t*>(begin_); 57313735955f39b3b304c37d2b2840663c131262c18Ian Rogers base_size_ = new_base_end - reinterpret_cast<uint8_t*>(base_begin_); 57413735955f39b3b304c37d2b2840663c131262c18Ian Rogers DCHECK_LE(begin_ + size_, reinterpret_cast<uint8_t*>(base_begin_) + base_size_); 575fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi size_t tail_size = old_end - new_end; 57613735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* tail_base_begin = new_base_end; 577fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi size_t tail_base_size = old_base_end - new_base_end; 578fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK_EQ(tail_base_begin + tail_base_size, old_base_end); 579fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi DCHECK(IsAligned<kPageSize>(tail_base_size)); 580fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi 581fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#ifdef USE_ASHMEM 582fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // android_os_Debug.cpp read_mapinfo assumes all ashmem regions associated with the VM are 583fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // prefixed "dalvik-". 584fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi std::string debug_friendly_name("dalvik-"); 585fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi debug_friendly_name += tail_name; 586fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi ScopedFd fd(ashmem_create_region(debug_friendly_name.c_str(), tail_base_size)); 5878dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith int flags = MAP_PRIVATE | MAP_FIXED; 588fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (fd.get() == -1) { 589fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi *error_msg = StringPrintf("ashmem_create_region failed for '%s': %s", 590fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi tail_name, strerror(errno)); 591fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 592fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 593fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#else 594fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi ScopedFd fd(-1); 595fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi int flags = MAP_PRIVATE | MAP_ANONYMOUS; 596fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi#endif 597fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi 598fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // Unmap/map the tail region. 599fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi int result = munmap(tail_base_begin, tail_base_size); 600fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (result == -1) { 601a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 602a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("munmap(%p, %zd) failed for '%s'. See process maps in the log.", 603a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe tail_base_begin, tail_base_size, name_.c_str()); 604fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 605fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 606fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // Don't cause memory allocation between the munmap and the mmap 607fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // calls. Otherwise, libc (or something else) might take this memory 608fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // region. Note this isn't perfect as there's no way to prevent 609fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // other threads to try to take this memory region here. 61013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* actual = reinterpret_cast<uint8_t*>(mmap(tail_base_begin, tail_base_size, tail_prot, 611fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi flags, fd.get(), 0)); 612fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi if (actual == MAP_FAILED) { 613a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe PrintFileToLog("/proc/self/maps", LogSeverity::WARNING); 614a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe *error_msg = StringPrintf("anonymous mmap(%p, %zd, 0x%x, 0x%x, %d, 0) failed. See process " 615a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe "maps in the log.", tail_base_begin, tail_base_size, tail_prot, flags, 616a6dfdae1cffc78f9791348b2e1dc8f4c6c3f7128Andreas Gampe fd.get()); 617fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi return nullptr; 618fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi } 619a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo return new MemMap(tail_name, actual, tail_size, actual, tail_base_size, tail_prot, false); 620cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier} 621d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 622c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogersvoid MemMap::MadviseDontNeedAndZero() { 623c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (base_begin_ != nullptr || base_size_ != 0) { 624c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (!kMadviseZeroes) { 625c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers memset(base_begin_, 0, base_size_); 626c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 627c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers int result = madvise(base_begin_, base_size_, MADV_DONTNEED); 628c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers if (result == -1) { 629c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers PLOG(WARNING) << "madvise failed"; 630c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 631c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers } 632c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers} 633c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers 634d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chienbool MemMap::Protect(int prot) { 6354fb5df8453367aa3f160ac230c03a7a98a28e562Hiroshi Yamauchi if (base_begin_ == nullptr && base_size_ == 0) { 6361c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 637d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 638d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 639d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 640d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (mprotect(base_begin_, base_size_, prot) == 0) { 6411c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 642d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 643d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 644d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 645a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao PLOG(ERROR) << "mprotect(" << reinterpret_cast<void*>(base_begin_) << ", " << base_size_ << ", " 646a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao << prot << ") failed"; 647d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return false; 648d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien} 649d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 6503eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchibool MemMap::CheckNoGaps(MemMap* begin_map, MemMap* end_map) { 6513eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 6523eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(begin_map != nullptr); 6533eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(end_map != nullptr); 6543eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(HasMemMap(begin_map)); 6553eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(HasMemMap(end_map)); 6563eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK_LE(begin_map->BaseBegin(), end_map->BaseBegin()); 6573eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = begin_map; 6583eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi while (map->BaseBegin() != end_map->BaseBegin()) { 6593eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* next_map = GetLargestMemMapAt(map->BaseEnd()); 6603eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (next_map == nullptr) { 6613eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // Found a gap. 6623eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return false; 6633eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 6643eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi map = next_map; 6653eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 6663eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return true; 6673eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 6683eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 66917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Markovoid MemMap::DumpMaps(std::ostream& os, bool terse) { 6703eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 67117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko DumpMapsLocked(os, terse); 6723eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 6733eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 67417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Markovoid MemMap::DumpMapsLocked(std::ostream& os, bool terse) { 67517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko const auto& mem_maps = *maps_; 67617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (!terse) { 67717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << mem_maps; 67817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko return; 67917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 68017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko 68117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // Terse output example: 68217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // [MemMap: 0x409be000+0x20P~0x11dP+0x20P~0x61cP+0x20P prot=0x3 LinearAlloc] 68317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // [MemMap: 0x451d6000+0x6bP(3) prot=0x3 large object space allocation] 68417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // The details: 68517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "+0x20P" means 0x20 pages taken by a single mapping, 68617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "~0x11dP" means a gap of 0x11d pages, 68717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // "+0x6bP(3)" means 3 mappings one after another, together taking 0x6b pages. 68817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "MemMap:" << std::endl; 68917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko for (auto it = mem_maps.begin(), maps_end = mem_maps.end(); it != maps_end;) { 69017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko MemMap* map = it->second; 69117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko void* base = it->first; 69217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko CHECK_EQ(base, map->BaseBegin()); 69317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "[MemMap: " << base; 69417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++it; 69517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko // Merge consecutive maps with the same protect flags and name. 69617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko constexpr size_t kMaxGaps = 9; 69717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t num_gaps = 0; 69817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t num = 1u; 69917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t size = map->BaseSize(); 70017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko CHECK(IsAligned<kPageSize>(size)); 70117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko void* end = map->BaseEnd(); 70217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko while (it != maps_end && 70317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko it->second->GetProtect() == map->GetProtect() && 70417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko it->second->GetName() == map->GetName() && 70517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko (it->second->BaseBegin() == end || num_gaps < kMaxGaps)) { 70617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (it->second->BaseBegin() != end) { 70717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++num_gaps; 70817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "+0x" << std::hex << (size / kPageSize) << "P"; 70917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (num != 1u) { 71017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "(" << std::dec << num << ")"; 71117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 71217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size_t gap = 71317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko reinterpret_cast<uintptr_t>(it->second->BaseBegin()) - reinterpret_cast<uintptr_t>(end); 71417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko CHECK(IsAligned<kPageSize>(gap)); 71517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "~0x" << std::hex << (gap / kPageSize) << "P"; 71617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko num = 0u; 71717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size = 0u; 71817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 71917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko CHECK(IsAligned<kPageSize>(it->second->BaseSize())); 72017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++num; 72117a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko size += it->second->BaseSize(); 72217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko end = it->second->BaseEnd(); 72317a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko ++it; 72417a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 72517a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "+0x" << std::hex << (size / kPageSize) << "P"; 72617a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko if (num != 1u) { 72717a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << "(" << std::dec << num << ")"; 72817a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 72917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko os << " prot=0x" << std::hex << map->GetProtect() << " " << map->GetName() << "]" << std::endl; 73017a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko } 7313eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7323eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7333eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchibool MemMap::HasMemMap(MemMap* map) { 7343eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi void* base_begin = map->BaseBegin(); 7356e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(base_begin), end = maps_->end(); 7363eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == base_begin; ++it) { 7373eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (it->second == map) { 7383eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return true; 7393eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7403eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7413eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return false; 7423eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7433eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7443eed93dd5be03e5539827bebf0f414251a12e15eHiroshi YamauchiMemMap* MemMap::GetLargestMemMapAt(void* address) { 7453eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi size_t largest_size = 0; 7463eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* largest_map = nullptr; 7476e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier DCHECK(maps_ != nullptr); 7486e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier for (auto it = maps_->lower_bound(address), end = maps_->end(); 7493eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi it != end && it->first == address; ++it) { 7503eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi MemMap* map = it->second; 7513eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi CHECK(map != nullptr); 7523eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi if (largest_size < map->BaseSize()) { 7533eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi largest_size = map->BaseSize(); 7543eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi largest_map = map; 7553eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7563eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi } 7573eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi return largest_map; 7583eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi} 7593eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 7606e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartiervoid MemMap::Init() { 7616e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 7626e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier if (maps_ == nullptr) { 7636e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier // dex2oat calls MemMap::Init twice since its needed before the runtime is created. 7646e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_ = new Maps; 7656e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier } 7666e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier} 7676e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier 7686e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartiervoid MemMap::Shutdown() { 7696e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier MutexLock mu(Thread::Current(), *Locks::mem_maps_lock_); 7706e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier delete maps_; 7716e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier maps_ = nullptr; 7726e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier} 7736e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier 774379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartiervoid MemMap::SetSize(size_t new_size) { 775379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier if (new_size == base_size_) { 776379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier return; 777379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier } 778379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_ALIGNED(new_size, kPageSize); 779379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_EQ(base_size_, size_) << "Unsupported"; 780379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_LE(new_size, base_size_); 781379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier CHECK_EQ(munmap(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(BaseBegin()) + new_size), 782379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier base_size_ - new_size), 0) << new_size << " " << base_size_; 783379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier base_size_ = new_size; 784379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier size_ = new_size; 785379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier} 786379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier 7870d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstromstd::ostream& operator<<(std::ostream& os, const MemMap& mem_map) { 7883eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi os << StringPrintf("[MemMap: %p-%p prot=0x%x %s]", 7893eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi mem_map.BaseBegin(), mem_map.BaseEnd(), mem_map.GetProtect(), 7903eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi mem_map.GetName().c_str()); 7910d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return os; 7920d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom} 7930d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 79427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} // namespace art 795