mem_map.cc revision 8d31bbd3d6536de12bc20e3d29cfe03fe848f9da
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 19e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes#include <corkscrew/map_info.h> 20e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes 21e222ee0b794f941af4fb1b32fb8224e32942ea7bElliott Hughes#include "base/stringprintf.h" 226c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "ScopedFd.h" 236c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "utils.h" 246c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 256c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#define USE_ASHMEM 1 266c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 276c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 286c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include <cutils/ashmem.h> 296c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 306c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 3127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstromnamespace art { 3227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 3396970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#if !defined(NDEBUG) 3496970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 35ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughesstatic std::ostream& operator<<(std::ostream& os, map_info_t* rhs) { 36ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes for (map_info_t* m = rhs; m != NULL; m = m->next) { 377bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes os << StringPrintf("0x%08x-0x%08x %c%c %s\n", 387bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes static_cast<uint32_t>(m->start), 397bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes static_cast<uint32_t>(m->end), 40ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes m->is_readable ? 'r' : '-', m->is_executable ? 'x' : '-', m->name); 41ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes } 42ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes return os; 4396970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes} 4496970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 4510c5b78436bf9e603d817b40d1b98961919362b1Ian Rogersstatic void CheckMapRequest(byte* addr, size_t byte_count) { 4627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (addr == NULL) { 4727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 4827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 49ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes 5096970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes uint32_t base = reinterpret_cast<size_t>(addr); 51ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes uint32_t limit = base + byte_count; 52ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes 53ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes map_info_t* map_info_list = load_map_info_list(getpid()); 54ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes for (map_info_t* m = map_info_list; m != NULL; m = m->next) { 557934ac288acfb2552bb0b06ec1f61e5820d924a4Brian Carlstrom CHECK(!(base >= m->start && base < m->end) // start of new within old 567934ac288acfb2552bb0b06ec1f61e5820d924a4Brian Carlstrom && !(limit > m->start && limit < m->end) // end of new within old 577934ac288acfb2552bb0b06ec1f61e5820d924a4Brian Carlstrom && !(base <= m->start && limit > m->end)) // start/end of new includes all of old 587bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes << StringPrintf("Requested region 0x%08x-0x%08x overlaps with existing map 0x%08x-0x%08x (%s)\n", 597bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes base, limit, 607bda15835732b2ce874a093c136ca406d4f20e00Elliott Hughes static_cast<uint32_t>(m->start), static_cast<uint32_t>(m->end), m->name) 61ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes << map_info_list; 6296970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes } 63ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes free_map_info_list(map_info_list); 6427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 6527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 6696970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#else 671bac54ffa933fbe9b92b62437577f2f4583eff1aElliott Hughesstatic void CheckMapRequest(byte*, size_t) { } 6896970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes#endif 6996970cdab3e28511322ce37fa578f6eff8931d72Elliott Hughes 708d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan RogersMemMap* MemMap::MapAnonymous(const char* name, byte* addr, size_t byte_count, int prot, 718d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string* error_msg) { 729004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 739004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom return new MemMap(name, NULL, 0, NULL, 0, prot); 749004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 75ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 76ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CheckMapRequest(addr, page_aligned_byte_count); 776c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 786c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 79a40307e8562c20d9b9ce46e773864d07d95512a1Ian Rogers // android_os_Debug.cpp read_mapinfo assumes all ashmem regions associated with the VM are 80a40307e8562c20d9b9ce46e773864d07d95512a1Ian Rogers // prefixed "dalvik-". 81a40307e8562c20d9b9ce46e773864d07d95512a1Ian Rogers std::string debug_friendly_name("dalvik-"); 82a40307e8562c20d9b9ce46e773864d07d95512a1Ian Rogers debug_friendly_name += name; 83a40307e8562c20d9b9ce46e773864d07d95512a1Ian Rogers ScopedFd fd(ashmem_create_region(debug_friendly_name.c_str(), page_aligned_byte_count)); 846c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE; 856c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes if (fd.get() == -1) { 868d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers *error_msg = StringPrintf("ashmem_create_region failed for '%s': %s", name, strerror(errno)); 878d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers return nullptr; 886c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes } 896c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#else 906c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes ScopedFd fd(-1); 916c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE | MAP_ANONYMOUS; 926c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 936c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 94ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes byte* actual = reinterpret_cast<byte*>(mmap(addr, page_aligned_byte_count, prot, flags, fd.get(), 0)); 9527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 968161c0336b97e11e02c000af357f8f40de2e23e4jeffhao std::string maps; 978161c0336b97e11e02c000af357f8f40de2e23e4jeffhao ReadFileToString("/proc/self/maps", &maps); 988d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers *error_msg = StringPrintf("anonymous mmap(%p, %zd, %x, %x, %d, 0) failed\n%s", 998d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers addr, page_aligned_byte_count, prot, flags, fd.get(), 1008d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers maps.c_str()); 1018d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers return nullptr; 10227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 1031c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier return new MemMap(name, actual, byte_count, actual, page_aligned_byte_count, prot); 10427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 10527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 1068d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan RogersMemMap* MemMap::MapFileAtAddress(byte* addr, size_t byte_count, int prot, int flags, int fd, 1078d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers off_t start, bool reuse, const char* filename, 1088d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string* error_msg) { 10927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 11027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, flags & (MAP_SHARED | MAP_PRIVATE)); 1119004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (byte_count == 0) { 1129004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom return new MemMap("file", NULL, 0, NULL, 0, prot); 1139004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 114f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'offset' to be page-aligned as required by mmap. 11527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom int page_offset = start % kPageSize; 11627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom off_t page_aligned_offset = start - page_offset; 117f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // Adjust 'byte_count' to be page-aligned as we will map this anyway. 118ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count + page_offset, kPageSize); 119f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // The 'addr' is modified (if specified, ie non-null) to be page aligned to the file but not 120f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers // necessarily to virtual memory. mmap will page align 'addr' for us. 121f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers byte* page_aligned_addr = (addr == NULL) ? NULL : (addr - page_offset); 122700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom if (!reuse) { 123700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom // reuse means it is okay that it overlaps an existing page mapping. 124700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom // Only use this if you actually made the page reservation yourself. 125700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom CheckMapRequest(page_aligned_addr, page_aligned_byte_count); 126f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers } else { 127f8adc60455b90c95a6a3c8f87830e4e88b2644e1Ian Rogers CHECK(addr != NULL); 128700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom } 129700c8d31733534a3d978b75a03f6f7e177dc7e81Brian Carlstrom byte* actual = reinterpret_cast<byte*>(mmap(page_aligned_addr, 130ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes page_aligned_byte_count, 13127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom prot, 13227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom flags, 13327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom fd, 13427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom page_aligned_offset)); 13527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 1368161c0336b97e11e02c000af357f8f40de2e23e4jeffhao std::string maps; 1378161c0336b97e11e02c000af357f8f40de2e23e4jeffhao ReadFileToString("/proc/self/maps", &maps); 1388d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers *error_msg = StringPrintf("mmap(%p, %zd, %x, %x, %d, %lld) of file '%s' failed\n%s", 1398d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers page_aligned_addr, page_aligned_byte_count, prot, flags, fd, 1408d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers static_cast<int64_t>(page_aligned_offset), 1418d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers filename, maps.c_str()); 14227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return NULL; 14327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 1441c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier return new MemMap("file", actual + page_offset, byte_count, actual, page_aligned_byte_count, 1451c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier prot); 14627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 14727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 14827ec961a1da540ba7f16c07a682585ab167317adBrian CarlstromMemMap::~MemMap() { 14930fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers if (base_begin_ == NULL && base_size_ == 0) { 15027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 15127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 15230fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers int result = munmap(base_begin_, base_size_); 15327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (result == -1) { 15427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom PLOG(FATAL) << "munmap failed"; 15527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 15627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 15727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 1581c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu ChartierMemMap::MemMap(const std::string& name, byte* begin, size_t size, void* base_begin, 1591c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier size_t base_size, int prot) 1601c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier : name_(name), begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size), 1611c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier prot_(prot) { 1629004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom if (size_ == 0) { 1639004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK(begin_ == NULL); 1649004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK(base_begin_ == NULL); 1659004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_EQ(base_size_, 0U); 1669004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } else { 1679004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK(begin_ != NULL); 1689004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK(base_begin_ != NULL); 1699004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom CHECK_NE(base_size_, 0U); 1709004cb6591781d1e6c5ec6d7bc6dc99d9ecee124Brian Carlstrom } 17127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom}; 17227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 173cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartiervoid MemMap::UnMapAtEnd(byte* new_end) { 174cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_GE(new_end, Begin()); 175cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_LE(new_end, End()); 176cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier size_t unmap_size = End() - new_end; 177cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier munmap(new_end, unmap_size); 178cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier size_ -= unmap_size; 179cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier} 180d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 181d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chienbool MemMap::Protect(int prot) { 182d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (base_begin_ == NULL && base_size_ == 0) { 1831c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 184d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 185d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 186d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 187d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (mprotect(base_begin_, base_size_, prot) == 0) { 1881c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 189d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 190d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 191d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 192a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao PLOG(ERROR) << "mprotect(" << reinterpret_cast<void*>(base_begin_) << ", " << base_size_ << ", " 193a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao << prot << ") failed"; 194d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return false; 195d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien} 196d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 19727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} // namespace art 198