mem_map.cc revision 1c23e1edb7361bbaec6e57fca86d8d3797960ad2
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 196c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "ScopedFd.h" 20ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes#include "stringprintf.h" 216c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#include "utils.h" 226c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 23ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes#include <corkscrew/map_info.h> 24ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott 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 45ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughesvoid 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) { 55ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CHECK(!(base >= m->start && base < m->end) // start of new within old 56ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes && !(limit > m->start && limit < m->end) // end of new within old 57ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes && !(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 70ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott HughesMemMap* MemMap::MapAnonymous(const char* name, byte* addr, size_t byte_count, int prot) { 71ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CHECK_NE(0U, byte_count); 7227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 73ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count, kPageSize); 74ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CheckMapRequest(addr, page_aligned_byte_count); 756c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 766c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#ifdef USE_ASHMEM 77ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes ScopedFd fd(ashmem_create_region(name, page_aligned_byte_count)); 786c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE; 796c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes if (fd.get() == -1) { 806c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes PLOG(ERROR) << "ashmem_create_region failed (" << name << ")"; 816c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes return NULL; 826c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes } 836c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#else 846c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes ScopedFd fd(-1); 856c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes int flags = MAP_PRIVATE | MAP_ANONYMOUS; 866c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes#endif 876c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes 88ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes byte* actual = reinterpret_cast<byte*>(mmap(addr, page_aligned_byte_count, prot, flags, fd.get(), 0)); 8927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 90ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes PLOG(ERROR) << "mmap(" << reinterpret_cast<void*>(addr) << ", " << page_aligned_byte_count 915ea8d4b0912a5bc139be21fc901f982a6b023675Elliott Hughes << ", " << prot << ", " << flags << ", " << fd.get() << ", 0) failed for " << name; 9227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return NULL; 9327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 941c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier return new MemMap(name, actual, byte_count, actual, page_aligned_byte_count, prot); 9527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 9627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 97ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott HughesMemMap* MemMap::MapFileAtAddress(byte* addr, size_t byte_count, int prot, int flags, int fd, off_t start) { 98ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CHECK_NE(0U, byte_count); 9927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, prot); 10027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom CHECK_NE(0, flags & (MAP_SHARED | MAP_PRIVATE)); 101ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes // Adjust 'offset' and 'byte_count' to be page-aligned. 10227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom int page_offset = start % kPageSize; 10327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom off_t page_aligned_offset = start - page_offset; 104ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes size_t page_aligned_byte_count = RoundUp(byte_count + page_offset, kPageSize); 105ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes CheckMapRequest(addr, page_aligned_byte_count); 10627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom byte* actual = reinterpret_cast<byte*>(mmap(addr, 107ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes page_aligned_byte_count, 10827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom prot, 10927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom flags, 11027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom fd, 11127ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom page_aligned_offset)); 11227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (actual == MAP_FAILED) { 11327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom PLOG(ERROR) << "mmap failed"; 11427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return NULL; 11527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 1161c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier return new MemMap("file", actual + page_offset, byte_count, actual, page_aligned_byte_count, 1171c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier prot); 11827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 11927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 12027ec961a1da540ba7f16c07a682585ab167317adBrian CarlstromMemMap::~MemMap() { 12130fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers if (base_begin_ == NULL && base_size_ == 0) { 12227ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom return; 12327ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 12430fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers int result = munmap(base_begin_, base_size_); 12527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom if (result == -1) { 12627ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom PLOG(FATAL) << "munmap failed"; 12727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom } 12827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} 12927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 1301c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu ChartierMemMap::MemMap(const std::string& name, byte* begin, size_t size, void* base_begin, 1311c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier size_t base_size, int prot) 1321c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier : name_(name), begin_(begin), size_(size), base_begin_(base_begin), base_size_(base_size), 1331c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier prot_(prot) { 13430fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK(begin_ != NULL); 13530fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK_NE(size_, 0U); 13630fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK(base_begin_ != NULL); 13730fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers CHECK_NE(base_size_, 0U); 13827ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom}; 13927ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom 140cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartiervoid MemMap::UnMapAtEnd(byte* new_end) { 141cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_GE(new_end, Begin()); 142cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier DCHECK_LE(new_end, End()); 143cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier size_t unmap_size = End() - new_end; 144cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier munmap(new_end, unmap_size); 145cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier size_ -= unmap_size; 146cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier} 147d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 148d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chienbool MemMap::Protect(int prot) { 149d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (base_begin_ == NULL && base_size_ == 0) { 1501c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 151d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 152d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 153d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 154d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien if (mprotect(base_begin_, base_size_, prot) == 0) { 1551c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers prot_ = prot; 156d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return true; 157d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien } 158d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 159a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao PLOG(ERROR) << "mprotect(" << reinterpret_cast<void*>(base_begin_) << ", " << base_size_ << ", " 160a060ed959efb8d57419edc3c5c1fa48372cc6588Shih-wei Liao << prot << ") failed"; 161d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien return false; 162d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien} 163d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 16427ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom} // namespace art 165